• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Holder unit for a cylindrical element and support sleeve in the bore for a component for a DTH. The cylindrical element and the support sleeve may, for example, be a bottom valve assembly for insertion into a counter-bore in a drill bit. The cylindrical element has a stiffness for a cylindrical element and at least a section of the support sleeve has a stiffness which is greater than the stiffness of the cylindrical element. A gap is provided between the sleeve and the component bore for the DTH. The cylindrical element is deformed in the gap, which results in the cylindrical element being clamped between the support sleeve and the component bore.
    公开号:SE1251013A1
    申请号:SE1251013
    申请日:2011-03-17
    公开日:2012-09-10
    发明作者:Jing James Yao；Paul Campbell；William H Ii Dell；Dale R Wolfer；Timothy J Plunkett
    申请人:Atlas Copco Secoroc Llc；
    IPC主号:
    专利说明:

    10152025intended to include the drill bit 6 and the neck 6 ”, whether the two details aretrained in one piece or separately. The drill bit 6 includes an upper end 6a, alower end 6b and a bore in the drill bit 6c, which extends from the lower endthe end 6b through the drill bit 6 along the center axis AC.
    Figure 1C further illustrates a representative lower section of a DTH according tostate of the art, including more details for a representative drill bit 6.
    The bore in the drill bit 6c has a diameter for the bore in the drill bit 6d.
    A counter-bore 6e is formed in the upper end 6a of the drill bit 6 coaxially withthe housing in the drill bit 6c (ie both the bore in the drill bit 6c andthe counterbore 6e are centered on the center axis AC) and have a diameter forthe counter-bore 6f, which is larger than the diameter of the bore in the drill bit 6d.
    The bottom of the counter-bore 6e defines an annular shoulder 6g, which extendsfrom the wall 6e of the counterbore to the upper part of the bore in the drill bit 6c.
    The counter bore 6e includes cavities 6h in the wall 6e of the counter bore.Relying on ur gures 1A and 1B, a piston 7 is movably arranged inside the housinghousing 4. The piston 7 includes an upper end 7a, a lower end 7b and apiston bore 7c, which extends through the piston 7 between the upper end 7a andthe lower end 7b. A valve element 8 is movably arranged inside the bore 4 of the housing,substantially between the piston 7 and the upper end 2b of the housing. A distribution cylinder 10 isarranged inside the bore 4 of the housing and receives the valve element 8 in an upper end 10aand receiving the upper end 7a of the piston 7 in a lower end 10b. The valve element 8and the distribution cylinder 10 jointly regulates and directs the flow of drive från uid fromthe feed chamber 5 to a drive chamber 12a above the piston 7 and areturn chamber 12b below the piston 7. The cyclic supply of drive fl uid tothe drive and return chambers 12a, 12b cause the piston 7 to rise and fall insidedrilling the housing 4. The cyclic up and down movement of the piston 7 causesthe bottom end 7b of the piston 7 to cyclically abut the upper end 6a of the drill bit 6to operate the drilling operation for the drill bit 6.10152025An exhaust pipe 14 is mounted inside the counter-bore 6e and extends fromthe upper end 6a of the drill bit 6 into the return chamber 12b. As the piston 7approaching the lower position (fi gur 1A), the exhaust pipe 14 extends intothe piston bore 7c, which cuts off the connection between the bore in the drill bit 6cand the return chamber 12b through the exhaust pipe 14. All as the piston 7 approachesthe raised position (Figure 1B), the exhaust pipe 14 is removed fromthe piston bore 7c and the connection between the bore in the drill bit 6c andthe return chamber 12b is established through the exhaust pipe 14.Yet another bunch of reference figures 1C, the exhaust pipe 14 is forced into the counter-bore6e. In the illustrated construction, the exhaust pipe 14 is a relatively simple oneplastic pipes including bumps 14a on the outer surface of its lower section.
    The exhaust pipe 14 in a DTH drill bit provides an essential function forthat the drill can be operated continuously. In the bosom of the DTH constructionaluminum pipes were used. Depending on the high material cost andcomplexity of the installation, aluminum pipes were replaced in the 1980s by plastic pipes. Onepopular plastic material for such pipes is Delrin® plastic. Delrin® is a registeredtrademark of E. I. Du Pont de Nemours and Company.
    The exhaust pipe 14 is held in the counter-bore 6e of the drill bit by means of apress fit and also by virtue of the interaction between the humps 14a andcavities 6h. The undeformed original outer diameter forthe exhaust pipe 14 is slightly larger than the diameter 6f of the counter-bore 6e.
    The exhaust pipe 14 is forced into the counter-bore 6e, which causesthe exhaust pipe 14 to be deformed. The ancient memory of the plastic material inthe exhaust pipe 14 causes the exhaust pipe 14 to expand towardsthe 6th wall of the counterbore. This gives rise to a gripping force fi between the exhaust pipe14 and the 6th wall of the counterbore. The gripping force is a function of (eg proportionalagainst) the pressure exerted by the exhaust pipe 14 against the wall of the counter-bore 6e andalso the surface area for contact between the exhaust pipe 14 and the wall of the counter-bore 6e.1015202530One aspect of the present invention is the realization that although plastic exhaust pipesoffers many benefits, a persistent problem has been, that such exhaust pipestends to come loose during its service life, compared to exhaust pipes made ofaluminum, steel or other suitable materials (collectively: “other suitablematerial"). The embodiments of the present invention described below areprimarily focusing on a device and a method of securing oneexhaust pipes in the counter-bore for a drill bit, to reduce the probability ofthe exhaust pipe comes loose during normal operation of the DTH. However, the invention isapplicable to secure substantially any cylindrical member within onecomponent for a DTH in a bore or counterbore in the component.
    Document WO20061 166646A2 describes a drill bit assembly for a strikerdrill comprising a cylindrical blow-off valve 14 with an engaging section 20,which is adapted to engage a locking section 16 for a bore indrill bit. The valve comprises a conical outer surface, which by means of friction gripsinto the inner conical surface of a drill bit. The material used in the composition forthe cylindrical exhaust pipe is plastically deformed up to the point where itdetaches from the drill bit bore during operation of the DTH. Thus, there is a need fora construction that eliminates the inconveniences of the plastic deformation ofthe cylindrical exhaust pipe.
    SUMMARYIn one embodiment, the invention provides a holding unit for onecylindrical element in a DTH drill, which includes a component includinga component bore having a diameter of a component bore,wherein the assembly comprises: a cylindrical element, which has an outerdiameter of a cylindrical element which is larger than that of the component borediameter and including a bore for a cylindrical element, whichdefines an inner diameter of a cylindrical element, the cylindrical onethe element has a rigidity for a cylindrical element; and a support sleeve, whichhas an outer sleeve diameter which is smaller than that of the cylindrical element10152025inner diameter and which is inserted into the bore of the cylindrical element to forma cylindrical element and a sleeve unit, at least a section ofthe support sleeve has a stiffness which is greater than that of the cylindrical elementstiffness; wherein the cylindrical element and the sleeve unit are inserted intothe component bore in such a way that the cylindrical element is deformedagainst the support sleeve to fit inside the component bore, so that the cylindricalthe element is clamped between the support sleeve and the component bore.
    In some embodiments, the component of the DTH includes a drill bit;the cylindrical element comprises an exhaust pipe; includes the cylindricalthe bore of the element a bore in the exhaust pipe; and they fi nier itthe cylindrical element and the support sleeve unit a bottom valve assembly for the DTH,wherein the bottom valve assembly is adapted to be inserted and removed alternatelyconnection to at least one chamber for the DTH for the purpose of driving throughblow-through of the exhaust pipe.
    In some embodiments, the cylindrical member includes the support sleeve assemblya gap between the support sleeve and the bore of the cylindrical element before insertionof the cylindrical member and the support sleeve assembly in the component bore; andcloses the deformation of the cylindrical element during insertion intothe component bore gap and causes the cylindrical element toapply pressure to the support sleeve.
    In some embodiments, the bore of the cylindrical member extends therethroughthe cylindrical element from a first end of the cylindrical element to a secondend, which is located opposite the first end; includes the cylindricalthe bore of the element a section of smaller diameter between the first end anda transition point and a section with a larger diameter between the transition pointsand the other end; and insert the support sleeve into the larger diameter section for itdrilling the cylindrical member to form the cylindrical member andthe sleeve assembly.1015202530In some embodiments, the cylindrical member includes a stop rim;the stop rim they fi nier an opening which has a smaller diameter than the outer onesleeve diameter, so that the stop rim after insertion of the support sleeve into the cylindricalthe bore of the element engages a section of the support sleeve to resist oneremoving the support sleeve from the bore of the cylindrical member. In someIn embodiments, the support sleeve includes a beveled surface to facilitate insertionof the support sleeve through the opening defined by the stop rim. In someembodiments, the support sleeve includes a cutout that matchesthe stop rim after insertion of the support sleeve into the bore of the cylindrical element. INsome embodiments include the stop rim at one end of the cylindricalthe element; and bringing one end of the support sleeve into engagement with the stop rim tomaintain one end of the support sleeve adjacent the end of the cylindrical member. In someembodiments include the cylindrical member first and second oppositeends and includes the support sleeve first and second opposite ends; and isthe stop rim located inside the bore of the cylindrical element in such a way thateach of the first and second opposite ends of the support sleeve are located betweenand separated by a distance from each of the first and second oppositesthe ends of the cylindrical element.
    In some embodiments, a wall is of at least one of the cylindrical memberand the support sleeve conical. In some embodiments, component drilling is includeda shoulder, against which both the cylindrical element and the support sleeve abutinsertion of the cylindrical element and the support sleeve assembly intocomponent drilling.
    In some embodiments, the support sleeve includes a longitudinally extending slotas they are fi niered by longitudinally extending free ends; and appliesdeformation of the cylindrical element after insertion of the cylindricalthe element and the support sleeve unit in the component bore press on the support sleeve, whichis enough to bring the free ends into contact and close itlongitudinally extending gap; and enables the contact between the free endsthat the support sleeve withstands additional pressure applied by the cylindrical element10152025on the support sleeve in such a way that further deformation of the cylindricalthe element appears after the free ends have come into contact.
    In some embodiments, the support sleeve has a non-circular cross-section andthey fi n the cylindrical bore a circular cross-section; and forcedthe support sleeve, after insertion of the cylindrical element and the support sleeve unit incomponent drilling, to assume a circular cross section under pressure applied bythe cylindrical element. In some embodiments, they are non-circularthe cross section of the support sleeve is an oval, which has a major axis and a minor axis;the support sleeve comes into contact with a surface of the bore of the cylindrical elementat the major axis of the support sleeve after insertion of the support sleeve into the cylindricalelement drilling; and creates contact between the support sleeve and a surface thereofthe bore of the cylindrical element a press fit between the support sleeve and the surface ofthe bore of the cylindrical element, which is sufficient to withstand oneremoving the support sleeve from the cylindrical member and sleeve assembly.
    In some embodiments, the support sleeve includes a section of a first rigidity anda section of a second stiffness which is lower than the first stiffness; deforrnerasthe section of a second rigidity during insertion of the cylindrical element andthe sleeve assembly of the component bore; and clamping the cylindrical elementbetween the section of a first rigidity and the component bore. In someembodiments include the section of a second stiffness stiffness reducingcharacteristic features. In some embodiments, the section includes a secondstiffness at least one of a gap, a hole and protrusions.
    In another embodiment, the invention provides a holding unit for onecylindrical element in a DTH drill, which includes a component includinga component bore, which has a diameter for a component bore,wherein the assembly comprises: a substantially cylindrical element including oneouter surface of a cylindrical element, which they en nier an outer diameter of a cylindricalelement, and the inner surface of a cylindrical element, which defines an inner diameterfor a cylindrical element, the generally cylindrical element having1015202530a stiffness for a cylindrical element; and a support sleeve including an outer surface,Which they fi deny the outer diameter of a support sleeve, wherein at least a section ofthe support sleeve has a stiffness which is greater than that of the cylindrical elementstiffness; wherein a larger diameter section for the support sleeve has an outerdiameter, which is larger than the inside diameter for a smaller diameter sectionfor the generally cylindrical element; wherein the support sleeve is adapted linerinsertion in the component bore began to define a gap between at least onesections of the outer surface of the support sleeve and the component bore; whereby in generalthe cylindrical element is adapted for insertion into the gap between the outer of the support sleevesurface and component drilling; and wherein the generally cylindrical member isadapted to be deformed after the smaller diameter section was generallyseen cylindrical element is forced over the section with larger diameter liningthe support sleeve, such deformation of the cylindrical element filling the gapand firmly clamping the generally cylindrical member between the support sleeve andcomponent drilling.
    In some embodiments, the component for the DTH includes a drill bit;the generally cylindrical member comprises an exhaust pipe; and they fi nierthe generally cylindrical element and the support sleeve together onebottom valve assembly for the DTH, the bottom valve assembly being adapted toalternately inserted and disconnected from at least one chamber for the DTHfor the fate of drive fl uid through the exhaust pipe. In some embodiments includethe support sleeve has a bevelled surface to facilitate insertion of it in generalcylindrical element in the gap. In some embodiments, the component bore isconical; are the outer and inner surfaces of the generally cylindrical memberconical; and the outer surface of the support sleeve is conical. In some embodiments includethe component bore a shoulder, against which at least the support sleeve abuts, thenthe generally cylindrical element is clamped between the support sleeve andcomponent drilling. In some embodiments, the support sleeve includes a section ofa first stiffness and a section of a second stiffness, which is lower than the firstthe stiffness; the section is deformed by a second stiffness during insertion of the general1015202530seen cylindrical element in the gap; and clamps it generally cylindricalthe element fixed between the section of a first rigidity and the component bore.
    In another embodiment, the invention provides a procedure forinserting a cylindrical element into a bore for a component of a DTH,wherein the bore has a diameter for a component bore, whereinthe method comprising: (a) providing a cylindrical member includinga bore for a cylindrical element and having a stiffness for onecylindrical element; (b) providing a support sleeve having an outer surfacesurface, at least a section of the support sleeve having a rigidity which isgreater than the stiffness of the cylindrical element; and (c) deformation of the cylindricalthe element against the component bore and the outer surface of the support sleeve for clampinginsert the cylindrical element between the support sleeve and the component bore.
    In some embodiments, the method further comprises the step (b ") of introducingthe support sleeve in the bore of the cylindrical element before step (c) so that theycylindrical element and a sleeve unit; and includes step (c) introducing itthe cylindrical element and the sleeve unit in the component bore. In someembodiments include step (b ”) the fi initiation of a gap between the support sleeveouter surface and the bore of the cylindrical element; and includes step (c)deformation of the cylindrical element to close the gap and apply pressureon the support sleeve. In some embodiments, step (a) involves the provision of astop rim in the cylindrical element, the stop rim forming an openingwith a diameter smaller than an outer diameter of at least one section of the support sleeveouter surface; and comprises step (b ') resisting a removal of the support sleeve fromdrilling the cylindrical element with the stop rim. In some embodimentscomprises step (b) providing a cutout in the support sleeve; and includesresistance to a removal of the support sleeve from the cylindrical elementdrilling engagement of the cut-out for the support sleeve with the stop rim. In someembodiments include providing a stop rim positioning ofthe stop rim at one end of the cylindrical member; and includes resistance toremoving the support sleeve maintaining one end of the support sleeve adjacent the end1015202530of the cylindrical element. In some embodiments, step (a) includesproviding a cylindrical element, which exhibits first and secondopposite ends; comprises step (b) providing a support sleeve, whichhas first and second opposite ends; and includes resistance to oneremoval of the support sleeve maintaining each of the first and second oppositesthe ends of the support sleeve in a position between and separated by onedistance from each of the first and second opposite ends of the cylindricalthe element. In some embodiments, step (a) includes the fi initiation of a circularcross section with the bore of the cylindrical element; includes step (b) the fi nierandeof a non-circular cross-section with the outer surface of the support sleeve; and includes step (c)forcing the outer surface of the support sleeve to assume a circular cross section under pressure such asapplied by the cylindrical element which is deformed against the support sleeve. In someembodiments include step (b) of the cross-section of the support sleeveouter surface of an oval, which has a major axis and a minor axis; includes step (b ')to bring the bore of the cylindrical element into contact with the support sleeve at the major axisto create a pressing engagement between the support sleeve and the cylindrical elementdrilling, which is sufficient to resist removal of the support sleeve therefromdrilling of the cylindrical element.
    In some embodiments, at least one of steps (a) and (b) includesproviding a conical surface in at least one of the cylindrical memberand the support sleeve. In some embodiments, they fi nier component drilling an approachat its bottom; and comprising step (c) abutting at least one of itthe cylindrical element and the support sleeve against the shoulder in the component bore. In someembodiments include step (b) providing a self longitudinallystretching gap in which they fi are formed by longitudinally stretching free endsthe support sleeve; involves step (c) deforming the cylindrical member forapplying pressure to the support sleeve, which is sufficient to release themthe ends in contact and closing the longitudinally extending gap; andstep (c) involves further continued deformation of the cylindrical memberagainst the support sleeve after the free ends are in contact.1010152025In some embodiments, step (b) comprises providing a support sleeve such asincludes a section of a first stiffness and a section of a second stiffness, whichis lower than the first stiffness; involves step (c) deformation of the section of asecond rigidity and firmly clamps the cylindrical element between the section of afirst rigidity and component drilling. Some embodiments include steps(b) further providing the section of a second rigidity withstiffness-reducing characteristic features of the support sleeve. In some embodimentsstep (b) further comprises providing at least one of grooves, holes andprotrusions in the section of a second stiffness.
    In some embodiments, step (a) involves providing a cylindricalelement, which has a substantially cylindrical section, and the fi niering in itdrilling the cylindrical member of a smaller diameter section; includesstep (b) providing a larger diameter section for the outer sleeve of the support sleevesurface, the larger diameter section having a diameter which is larger thanthe smaller diameter section; includes step (c) inserting the support sleeve intocomponent drilling to define a gap between at least a section ofthe outer surface of the support sleeve and the component bore, inserting it substantiallycylindrical section of the gap and deformation of the substantially cylindricalthe section after the smaller diameter section of the cylindrical elementdrilling is forced over the larger diameter section of the support sleeve. In someembodiments, the component bore is conical; includes step (a)providing conical inner and outer surfaces of the substantially cylindricalthe section; and comprises step (b) providing a conical outer surface ofthe support sleeve.
    Other aspects of the invention will become apparent upon consideration thereofdetailed description and accompanying drawings.
    BRIEF DESCRIPTION OF THE DRAWINGSFigure 1A illustrates a representative DTH according to the prior art in a firstoperating position.ll101520Figure 1B illustrates a representative DTH according to the prior art in a secondoperating position.
    Figure 1C illustrates a representative drill bit according to the prior art and aexhaust pipe assembly for a DTH.
    Figure 2A is a cross-sectional view of a first embodiment of the present inventioninvention installed in a counter bore with straight walls.
    Figure 2B is a cross-sectional sectional view of the first embodiment.
    Figure 2C is an enlarged cross-sectional view of a section of the bucket valve assemblyaccording to the first embodiment in a voltage-free state before insertion intothe counter-drilling.
    Figure 2D is an enlarged cross-sectional view of the section of the bucket valve assembly,illustrated in Figure 2C, after the assembly has been inserted into the counterbore.
    Figure 2E is a cross-sectional view of the first embodiment ofthe bucket valve assembly installed in a traditional counter-drilling.
    Figure 3 is a cross-sectional view of a second embodiment of the bucket valve assemblyinstalled in a counterbore.
    Figure 4A is a cross-sectional view of a third embodiment of the bucket valve assemblyinstalled in a counter-bore with straight walls.
    Figure 4B is a cross-sectional view of a third embodiment of the bucket valve assemblyinstalled in a traditional counterbore.
    Figure 5 is a cross-sectional view of an old embodiment of the bucket valve assembly.installed in a counterbore.
    Figure 6A is a perspective view of a support sleeve for a fifth embodiment ofthe bottom valve assembly.12101520Figure 6B is a cross-sectional view of the bottom valve assembly of the fifththe embodiment in a voltage-free state before insertion into the counter-bore.
    Figure 6C is a cross-sectional view of the bottom valve assembly of the fifththe embodiment after the unit has been inserted into the counter-bore.
    Figure 7A is a perspective view of a support sleeve for a sixth embodiment ofthe bottom valve assembly.
    Figure 7B is a cross-sectional view of the bottom valve assembly of the sixththe embodiments in a voltage-free state before insertion into the counter-bore.
    Figure 7C is a cross-sectional view of the bottom valve assembly of the sixththe embodiment after the unit has been inserted into the counter-bore.
    Figure 8 is a cross-sectional view of the bottom valve assembly of a seventhembodiment installed in a counterbore.
    Figure 9A is a perspective view of a support sleeve for an eighth embodiment ofthe bottom valve assembly.
    Figure 9B is a cross-sectional view of the eighth embodiment ofthe bottom valve assembly inserted in the counterbore.
    Figure 10 is a cross-sectional view of a ninth embodiment ofthe bottom valve assembly installed in the counterbore.
    DETAILED DESCRIPTIONBefore explaining any embodiments of the invention, it will be appreciated thatthe invention is not limited in its application to the construction details andarrangement of components presented in the following description oras illustrated in the following drawings. The recovery may have othersembodiments and can be practiced or performed in different ways.131015202530Some terminology is used in the following description for convenience onlyand is not limiting. The words "right", "left", "lower", "upper", "up","Down" and "Down" indicate the direction in the drawings to which reference is made. Order"inner", "inward" and "outer", "outward" refer to directions towards and away from aspecified center line or a geometric center of a described element,the special meaning being obvious from the context of the description.
    Furthermore, the word "connected", as used herein, is intended to include directconnections between two elements without any other elements attachedbetween them and indirect connections between elements, in which one or fl your otherselements are interposed therebetween. The terminology includes the words somspecifically mentioned above, derivatives thereof and words of similar meaning.
    We have identified the causes of the loosening of exhaust pipes in the counter-boreincludes crawling (also called "relaxation") and contraction (collectively"Changes in material properties") of the material under the exhaust pipelife span. Creep is the tendency of a solid material to move slowly ordeformed permanently under the influence of stresses. Creep appears as oneresults of long-term exposure to levels of voltage, which are belowthe yield strength of the material. The creep increases with increasing temperature and is moresevere in materials exposed to heat (eg near melting point of the material)for long periods of time. The deformation rate resulting from creep is onen lnction of the material properties, time of exposure, exposure temperatureand the structural load applied. Thus, for a givenexhaust pipe, the rate of creep a function of the temperature and itstructural load applied.
    The structural load applied to an exhaust pipe arises as soon as itis installed, from the press fit with the counterbore. Paradoxically,the narrower a blow-out pipe is fitted in the counter-bore for a drill bit (iethe narrower the press fit and the higher the resulting pressure), the fasterit to loosen, due to the resulting pressure-induced creep inthe material. With respect to temperatures, the higher the operating temperatures141015202530is inside the DTH, the more likely the crawl rate to increase inthe exhaust pipe.
    Turning now to the various embodiments of the invention, it is illustratedand describe all embodiments for use in a DTH having themthe basic components of what is illustrated in Figures 1A, 1B and 1C.
    The reference numerals for the drill bit 6 and its various aspects (ie upper end)6a, lower end 6b, bore 6c, the diameter of the bore 6d, the counter bore 6e,the diameter of the counter-bore 6f, the bottom of the annular counter-bore 6 gand the cavities 6h) are to be used below, as a representative example of a known onedrill bit is helpful for an understanding of the invention. It should be understood, however, thatthe present invention is applicable to other types of DTH drill bits and -counter bores (including, but not limited to, counter boresdiameters that taper off).
    In all embodiments discussed below, an exhaust pipe is reinforced on oneinner surface with a support sleeve and the combination of the exhaust pipe and the support sleeveis referred to as a “bottom valve assembly”. Other embodiments maycomprise a cylindrical element which is not an exhaust pipe, in which casethe combination of the cylindrical element and the support sleeve can be described as “acylindrical element and sleeve assembly ”or a“ sleeve tube assembly ”. While typicalExhaust pipes are constructed of Delrin® plastic material, the exhaust pipe canoptionally be constructed of other suitable polymers, copolymers,ultra-high molecular weight materials (U HMW), composite materials (eg exhibiting differentmaterials for the upper section and the lower section), metals (eg softermetals which would be less rigid than the material of which the support sleeve is madedesigned) and other materials that meet the specifications of the inventiondescribed in this specification and which are within the scope of the appended claimspatent claims. The exhaust pipe may possibly include a stiffer upper section forto facilitate insertion of the bottom valve assembly into the counter bore 6e. The stifferthe upper section can be provided by making the wall for the upper sectionthicker or by constructing the exhaust pipe of a composite material which1510152025exhibits a higher stiffness in the upper section than in a lower section.
    The exhaust pipe can, for example, be machined, cast or molded.
    Other suitable materials for the support sleeve include, but are not limited to, steel,aluminum, copper, glass-filled polymers and any other materials such asmeets the specifications for the invention described in this description.
    Generally desirable material properties for the support sleeve are highmodulus of elasticity, low weight, good thermal stability and high rigidity or rigidity. INall embodiments are at least one section of the support sleeve stiffer thanthe exhaust pipe in such a way that the exhaust pipe can be deformed into the spacebetween the support sleeve and the counterbore wall in the drill bit. Variations of theillustrated and described embodiments are within the scope of the invention,including, but not limited to, variations of an embodiment such asincludes characterizing features of another embodiment.
    In addition, although the embodiments discussed in this specification mayrelates to the invention which has assumed the embodiment of abottom valve assembly, the invention is applied to essentially anycylindrical part inserted into a bore in a component of a DTH.
    For example, the invention can be applied to a device and a process forinstallation of the components air conductor, air distributor or control rod for a DTH.
    The term "cylindrical element" is intended to include all types of tubes andcylinders, whether they involve a piercing, counter-drilling or ablind drilling.
    It will be appreciated that terrneri this description, such as upper end, lower end, uppersection, lower section, inner surface, outer surface, inner diameter and outer diameter, then theis used with reference to the exhaust pipe, the support sleeve andbottom valve assembly, refers to the ordinary meaning of such termscorresponding to parts of the components illustrated in the accompanyingthe drawings. Reference terms may not be used to simplify the drawingsto identify all such terms, as they are deemed obvious161015202530normal professional. In addition, it should be appreciated that a component exhibiting internaland outer surfaces (such as the support sleeve and the exhaust pipe) they en n a wall betweenthe inner and outer surfaces, although the wall may not be explicitly proclaimed and marked inthe drawings and that a bore (such as the counter-bore 6e) is necessarilylimited by a borehole wall.
    A first embodiment of a bottom valve assembly 100 is illustrated in Figures 2A.2B, 2C, 2D and 2E. The bottom valve assembly 100 includes an exhaust pipe 120and a support sleeve 125, and is illustrated in Figure 2A when installed in acounter-bore with straight walls 6e (ie a counter-bore 6e, which does not have anycavities 6h). Referring to Figure 2B, the exhaust pipe 120 is substantially onecylindrical element, which has a bore and includes an uppersection 130, which extends above the upper end 6a of the drill bit 6, and alower section 135, which is inserted into the counter-bore 6e in the drill bit 6. The section ofthe piercing, where the upper section 130 of the piercing meets the lower onesection 135 of the piercing, may be referred to as the "transition point" forthe piercing. The inner diameter 140 of the bore in the upper section130 is approximately equal to the diameter 6d of the bore in the drill bit 6c. The lowersection 135 of the exhaust pipe 120 may optionally include an outer diameter145 which is different from or the same as the outer diameter of the upper section130. In any case, the undeformed outer diameter 145 is for the lower onesection 135 of the exhaust pipe 120 slightly larger than the diameter 6f forthe counterbore 6e. The section of the piercing in the lower section 135 ofthe exhaust pipe 120 includes an inner diameter 150 which is larger thanthe inner diameter 140 of the bore in the upper section 130. The bottom edge ofthe exhaust pipe 120 includes an integrated stop ring or rim 155 whichthey have a circular opening, which has a diameter of 160, which is larger thanthe inner diameter 140 of the upper section 130, but smaller than the inner diameter 150for the lower section 135.
    The support sleeve 125 is substantially cylindrical, and includes an upper end 165, whichare they fi nied by a beveled surface 170 defining an angle of zero to thirty171015202530degrees (0 ° -30 °) with respect to the center line an AC for the sleeve 125, so that the outerthe diameter of the support sleeve 125 increases from the upper end 165 to a bottom end 175of the chamfered surface 170. In a representative embodiment, the angle is between zeroand ten degrees (0 ° -10 °) and in another embodiment the angle is two and a halfdegrees (2.5 °). The chamfered surface 170 facilitates insertion of the support sleeve 125 inthe exhaust pipe 120 through the stop rim 155. The outer diameter 180 forthe support sleeve 125 below the beveled surface 170 (simply referred to as thethe outer diameter of the support sleeve 125) is slightly smaller than the inner diameter 150 ofthe exhaust pipe 120. At its lower end, the support sleeve 125 includes a cutout185 in its outer surface which has a depth and a height which are sufficient toaccommodate the stop rim 155 of the exhaust pipe 120. In other embodimentsthe cutout 185 be located between the upper and lower ends of the support sleeve125 and the stop rim 155 may be located between the upper and lower ends ofthe bore in the exhaust pipe 120. An inner diameter 190 of the support sleeve 125 isabout equal to the inner diameter 140 of the upper section 130 ofthe exhaust pipe 120 and the diameter 6d for the bore in the drill bit 6c. The support sleeve125 can be made of, for example, steel which has a hardness of 20-55 HRcand preferably 30-45 HRc. The thickness of the support sleeve in the illustratedthe embodiment should be 1.0-5.0 mm and preferably 1.5-2.5 mm.
    The first embodiment of the bottom valve assembly 100 is mounted throughinserting the support sleeve 125 into the lower section 135 of the exhaust pipe 120through the stop rim 155. The stop rim 155 bends away at all ersom as the support sleeve 125rushes in, and snaps back to its original state as soon as the lower edgeof the support sleeve 125 has become free from the stop rim 155, so that the stop rim 155 is receivedinside the cutout 185. The stop rim 155 resists the support sleeve 125 so that it does notfalls out of the exhaust pipe 120 during handling of the bottom valve assembly 100.
    The bottom valve assembly 100 will be referred to as being in itsundeformed conditions, before it is installed in the counterbore 6e. In itthe undeformed state is a small gap 195 (see Figure 2C) defined between thethe inner surface of the lower section 135 of the exhaust pipe 120 and the outer of the support sleevearea 125.181015202530Now referring to Figure 2D, the bottom valve assembly 100 is forced into the counter bore 6euntil the lower end 155 of the exhaust pipe 120 abuts the shoulder 6 g atthe bottom of the counter-bore 6e. The lower edge of the support sleeve 125 (section ofthe sleeve at the bottom of the cut-out 185) also lies against the shoulder 6g. In othersembodiments may not be necessary to contact the support sleeve 125with the shoulder 6g. The exhaust pipe 120 is deformed to fit inside the diameter 6ffor the counterbore 6e. The support sleeve 125 is stiffer than the exhaust pipe 120, so thateven if the lower section 135 of the exhaust pipe 120 is deformed againstthe support sleeve 125 and against the wall 6e of the mating, the support sleeve 125 is eitherundeformed or deforned only insignificantly compared with the defornation ofthe exhaust pipe 120.
    As used herein, the term "deform" includes and its derivativeselastic and plastic deflection and stretching of a material, whether it isby mechanical, thermal or other load. The load (mechanical,thermal or other), in which a material will be deformed, is referred to hereinas the threshold load. If the application of the threshold load can be lowersection 135 of the exhaust pipe 120 is only deformed to a limited degree beforecolumn 195 is filled. As soon as the gap 195 is filled, the exhaust pipe 120 willdeformed elastically as well as plastically. The state of tension for much of itlower section 135 of sleeve 120 (i.e., most of the section sandwiched betweenthe support sleeve 125 and the counterbore wall 6e) are hydrostatic, but the upper andthe bottom ends of the lower section 135 of the exhaust pipe 120 can stillgive in plastic after the column 195 is filled.
    Deformation of the exhaust pipe 120 against the support sleeve 125 and the counter-bore 6egives rise to a press fit, which includes a friction interface on theinner and outer surfaces of the exhaust pipe 120. As soon as the bottom valve assembly 100is fully installed, the frictional interface between the exhaust pipe 120 is the outer surface andthe wall of the counter-bore 6e sufficient to withstand a removal ofthe bottom valve assembly 100 from the counter bore 6e during regular operation ofThe DTH, and the exhaust pipe 120 can be said to be "firmly clamped" between the support sleeve1910152025125 and the 6th wall of the counterbore. The rigid support, which is insured the inner surfaceof the lower section 135 of the exhaust pipe 120 through the support sleeve 125, resistschanges in creep, relaxation and other material properties forthe exhaust pipe 120.
    Figure 2E illustrates the first embodiment of the bottom valve assembly 100,but inford in a counter-bore 6e of the drill bit. More specifically includescounter-drilling 6e cavities 6h. The outer surface of the exhaust pipe 120 extendsacross the cavities 6h in this type of counterbore 6e. The total surface area ofthe press fit between the exhaust pipe 120 and the counter-bore 6e is reduceddepending on the cavities 6h, but there is still sufficient surface area to be fixedclamp the bottom valve assembly 100 inside the counter bore 6e.
    Figure 3 illustrates a second embodiment of the bottom valve assembly 200 asincludes an exhaust pipe 220 and a support sleeve 225. The exhaust pipe 220includes a lower section 235 having humps 210 that mat withcavities 6h in a traditional drill bit counter-bore 6e. Otherwise isthe bottom valve assembly 200, its mounting procedure, the insertion procedureof it in the counter-bore 6e and the theory of its operation, including clampingthe exhaust pipe 220 between the support sleeve 225 and the counter-bore 6e, the same asfor the first embodiment 100.
    Figures 4A and 4B illustrate a third embodiment of the bottom valve assembly300 which includes an exhaust pipe 320 and a support sleeve 325. The exhaust pipe320 includes a lower section 335. Exhaust pipe 320 does not include onestop rim at its lower end. In this embodiment 300 is the inner surface thereoflower section 335 of the exhaust pipe 320 and the outer surface 325 of the support sleeve conical.
    In other words, the diameter of the inner surface of the lower section 335 increases from itthe upper part of the lower section 335a to the bottom of the lower section or thedistal end 335b of the exhaust pipe 320, and the diameter of the outer sleeve of the support sleevesurface 325 increases from the upper part of the support sleeve 325a to the bottom of the support sleeve325b. The taper is substantially linear for both the exhaust pipe 320 and201015202530the support sleeve 325 in the illustrated embodiment, but could be non-linear in other embodiments or variations of this embodiment such asembodiments that have a stop rim. The outer surface of the lower section335 of the exhaust pipe 320 and the inner surface of the support sleeve 325 is the same as inthe first embodiment 100 (i.e. the surfaces have constant diameters from)upper part to bottom). As a consequence of the conical surfaces, the wall is for itlower section 335 of the exhaust pipe 320 relatively thin at the distal end335b and becomes linearly thicker towards the upper end 335a, and the wall of the support sleeve325 is thicker at the lower end 325b and becomes linearly thinner as one movesup from the support sleeve 325 to the upper end 325 a.
    In Fig. 4A, the third embodiment of the bottom valve assembly 300 is installeda counter-bore with straight walls 6e, and in 4 gur 4B the samebottom valve assembly 300 into a counter bore 6e having cavities 6h.
    Regardless of the type of counterbore 6e, the support sleeve 325 is first placed inthe counter-bore 6e, resting on the shoulder 6g at the bottom of the counter-bore 6e.
    The exhaust pipe 320 is then inserted into the space between the support sleeve 325 andthe 6th wall of the counterbore. Due to the conical outer surface of the support sleeve 325there is a significant gap between the upper edge 325a of the support sleeve 325 andthe 6th wall of the counterbore. The conical outer surface of the lower section 335 ofthe exhaust pipe 320 makes the insertion of the exhaust pipe 320 easier, since itrelatively thin distal end 335b is easily inserted into the relatively wide gap betweenthe upper part 325a of the support sleeve 325 and the wall 6e of the counter-bore. Asthe exhaust pipe 320 is inserted further into the counter-bore 6e, it meets resistanceas the inner and outer surfaces of the exhaust pipe 320 come into contactwith the support sleeve 325 and the counterbore wall 6e. Before the distal end 335b ofthe exhaust pipe 320 reaches the shoulder 6g at the bottom of the counter-bore 6e, beginsthe exhaust pipe 320 is deformed. At the time the distal end 335b ofthe exhaust pipe 320 abuts the shoulder 6g at the bottom of the counter-bore 6e,the material of the exhaust pipe has been deformed to fill the gap between the support sleeve325 and the wall 6e of the counter-bore for clamping the exhaust pipe 320between the support sleeve 325 and the wall 6e of the counter-bore.211015202530Figure 5 illustrates a fourth embodiment of the bottom valve assembly 400, whichis similar to the third embodiment 300, except that both the inner and outer surfaces ofthe lower section 435 of the exhaust pipe 420 is conical. Consequently, it is increasingthe diameters of both the inner surface and the outer surface of the lower section 435from the upper part 435a to the bottom 435b. The support sleeve 435 in this embodimentis identical to what is described above for the third embodiment.
    The counterbore 6e involves a reverse taper, which increases in diameter fromthe upper part of the counter-bore 6e to its bottom 6g. The conical outer surface ofthe exhaust pipe 420 and the inverted conical counter bore bore are similar to those ofdisclosed in co-pending U.S. Patent Application No. 11/919468, filedOctober 29, 2007 and published as a U.S. patent application with publication number2009/0308661 -Al 17 December 2009, incorporating its entire contentshereby by reference thereto. Given that the outer surface of the exhaust pipe 420widened, at least in the lower section 435, the exhaust pipe 420 is technicallynot a cylindrical element. Nevertheless, the exhaust pipe 420, sincethe angle for the taper of the outer surface is relatively small (eg about 0.5 ° -3.0 ° as described in U.S. Patent Application No. 11/919468), is designated "isubstantially cylindrical "or a" substantially cylindrical element "therefordescriptive purposes.
    It should be noted that this embodiment can also be used in a traditionaldrill bit, either having straight walls that are parallel to the center lineAC as in Figure 4A or showing cavities as in Figure 4B. In addition, canthe exhaust pipe 420, if the counter-bore 6e is not inverted conical, include astop rim at its distal end and the support sleeve 425 can be inserted into the exhaust pipe420 before inserting the bottom valve assembly 400 into the counter bore 6e.
    Figures 6A, 6B and 6C illustrate a fifth embodiment ofthe bottom valve assembly 500, in which the support sleeve 525 includes onelongitudinally extending gap 510 as they are av niered by free ends 515. The gapwidth 510 is not necessarily scalable in Figures 6A and 6B and may berelatively small in a commercial embodiment. Exhaust pipe 520 is located2210152025substantially along the lines of any of the exhaust pipe in those described abovethe embodiments, such as the exhaust pipe 120 of the first embodiment 100.
    The exhaust pipe 520 may optionally include a stop rim similar to the stop rim155 of Figure 2B, with which a cutout 585 at the bottom edge of the support sleeve 525fits after insertion of the support sleeve 525 into the exhaust pipe 520.
    Referring to Figure 6B, the support sleeve 525 is when the support sleeve 525 is pushed intothe exhaust pipe 520, voltage free in such a way that the free ends 515 areseparated from each other and defining the column 510. Referring to Figure 6Cthe exhaust pipe 520 is radially deformed as soon as the bottom valve assembly 500 is forcedinto the counterbore 6e, which applies a closing pressure to the support sleeve 525. Asas a result of the radially acting pressure, the free ends 515 are pressed againsteach other and the column 510 closes. As soon as the free ends 515 of the support sleeve 525 reachcontact with each other, the support sleeve 525 resists further radially acting pressureand the exhaust pipe 520 is clamped between the support sleeve 525 and the counter-bore 6e,which gives rise to a press fit which firmly clamps the exhaust pipe 520 inthe counterbore 6e.
    Figures 7A, 7B, and 7C illustrate a sixth embodiment ofthe bottom valve assembly 600, in which the support sleeve 625 resembles the support sleeve in the firstEmpty. fifth embodiments, but has a substantially oval cross-section with onelarger dimension 610 and a smaller dimension 615. When it is installed inthe exhaust pipe 620 (fi gur 7B), the support sleeve 625 may possibly touchthe inner surface of the exhaust pipe at the major axis 610 of the support sleeve, but a gap 617 isdefined between the exhaust pipe 620 and the rest of the outer surface of the support sleeve 625.
    If the bottom valve assembly 600 is inserted into the counter bore 6e (fi gur 7C),the support sleeve 625 is forced to assume a round shape, which closes the gap 617. As soon asgap 617 has been closed, pressure is applied from the deformed exhaust pipe 620around the entire circumference of the support sleeve 625.
    The exhaust pipe 620 used with this embodiment may be substantially similarone of the above-identified exhaust pipes in other embodiments, and may231015202530or may not include a stop rim (similar to stop rim 155 in guras 2B, 2Cand 2D) at the bottom spirit. The support sleeve 625 may include a cutout 685 tofit together with such a stop rim. The friction between the support sleeve 625 andthe exhaust pipe 620 at the major axis 610 of the support sleeve 625 may optionally besufficient to retain the sleeve 625 within the exhaust pipe 620 belowthe assembly, in which case the stop edge and the cutout 685 can be eliminated fromthis embodiment.
    Figure 8 illustrates a seventh embodiment 700, in which the exhaust pipe 720 firstis installed in the counter-bore 6e, and the support sleeve 725 is then forced intothe exhaust pipe 720 from an upper end 710 of the exhaust pipe 720. The outerthe diameter of the exhaust pipe 720 should be smaller than the diameter 6f forthe counter-bore 6e in this embodiment, so that a gap is defined between itouter surface of the exhaust pipe 720 and the counter bore 6e. Inner diameter740 for the upper section 730 of the exhaust pipe 720 years larger than the outer onethe diameter 780 of the support sleeve 725 by four thousandths of an inch to one tenth ofone inch (0.004 "-0.100") to facilitate the fit of the support sleeve 725 to thelower section 735 of the exhaust pipe 720. In one embodiment the inner diameter is740 larger than the outer diameter 780 by between two and ten thousandths of an inch(ie 0.002 ”to 0.0l0”). At the transition from the upper section 730 to the lowersection 735, decreases the inside diameter of the exhaust pipe 720 during a chamfer715 to a diameter which is slightly smaller than the outer diameter 780 forthe support sleeve 725. The bevel angle is preferably between zero and thirtydegrees (0 ° -30 °) and constitute an embodiment ten degrees (10 °). Continued introduction ofthe support sleeve 725 in the exhaust pipe 720 applies pressure to the lower of the exhaust pipesection 735 to deform the lower section 735 to fill the gap and pressagainst the counter-bore 6e. This generates the press fit between the exhaust pipe 720and the support sleeve 725 and the counter-bore 6e, with the result that the exhaust pipe 720firmly clamped inside the counter-bore 6e. The support sleeve 725 is inserted until its lower edgeabuts the shoulder 6g at the bottom of the counter-bore 6e. In a variation ofthis seventh embodiment, both the inner diameter and the outer diameter canthe exhaust pipe 720 may provide a relatively small pressing grip with241015202530the support sleeve 725 and the counter-bore 6e, respectively. This would be achieved by doingthe outer diameter of the exhaust pipe 720 is insignificantly larger than that of the counter-bore 6ediameter, and by making the inner diameter of the exhaust pipe 720 completely insignificantsmaller than the outer diameter of the support sleeve 725.
    Figures 9A and 9B illustrate an eighth embodiment ofthe bottom valve assembly 800, which includes an exhaust pipe 820 and asupport sleeve 825. The exhaust pipe 820 is substantially similar to the exhaust pipe 120 according tothe first embodiment discussed above. The support sleeve 825 mayincluding a cutout 825 at its lower end for engaging a stop rim inthe exhaust pipe 820. The support sleeve 825 includes fingers 810 on its lower section.
    The fingers 810 are separated peripherally in such a way that the slots 815 aredefined between them. Figures 9A and 9B do not necessarily show the exact onesthe proportions of fi ngrams 810 and slots 815 in relation to the support sleeve 825. Inotherwise, the support sleeve 825 is substantially the same as the support sleeve 125 according to the firstthe lining form. The support sleeve 825 can be termed "crenellated" due to the shapeof g ngrama 810 and columns 815, and g ngrams and columns can be named"Protrusions" or "castle-like tracks".
    The seam with fi ngrama 810 and the column themes 815 is to weaken the lower section ofthe support sleeve or to reduce its rigidity. In this regard, the support sleeve 825is said to exhibit a section of a first stiffness (the upper section) and a section ofa second stiffness (the lower section) that exhibits a lower stiffness or isless stiff than the section of a first stiffness. The section of a second stiffness ispreferably still stiffer than the exhaust pipe 820. Reduction of the stiffnessfor the lower section of the sleeve can facilitate insertion ofthe bottom valve assembly 800 in the counter-bore 6e, where the friction andthe press fit between the exhaust pipe 820 and the counter-bore 6e becomes too largeand causes undesirable premature stretching of the exhaust pipe 820, orresulting in the bottom valve assembly 800 getting stuck in the counter bore 6e beforethe bottom valve assembly 800 is fully inserted. The protrusions allow the lower section ofthe support sleeve to bend away or t.o.m. give in to reduce the press fit and2510152025the friction between the lower section of the exhaust pipe 820 and the counter-bore6e. Consequently, the section is deformed by a second stiffness during the insertion ofthe bottom valve assembly 800 in the counter bore 6e, so that the exhaust pipe 820 is fixedclamped between the section of a first rigidity and the counter-bore 6e.
    In other embodiments, the lower section of the support sleeve may be weakened ormade less rigid to achieve a similar result as those identified abovethe projections by providing a plurality of holes or othersstiffness-reducing characteristic features in the lower section of the support sleeve.
    Such holes may possibly exhibit the additional functionality of facilitatingremoving the support sleeve 825 from the exhaust pipe 820 with a hook orsimilar.
    Figure 10 illustrates a ninth embodiment of the bottom valve assembly 900, whichincludes an exhaust pipe 920 having first and second opposite ends anda support sleeve 925 having first and second opposite ends. Exhaust pipe920 is substantially the same as the exhaust pipe 120 of the formerembodiment, except that the stop rim 955 is raised into the lower section935 of the exhaust pipe 920. The stop rim 955 may be located, for examplehalfway up in the lower section 935. The stop rim 955 is formed in one piece inthe wall of the lower section 935 and extends inwardly from the inner surface.
    The support sleeve 925 is substantially identical to the support sleeve 125 according to the firstthe embodiment, except that it is shorter so that it occupies only the upper partof the lower section 935. Consequently, each of the first and second is oppositethe ends of the support sleeve 925 positioned between and separated by a distancefrom each of the first and second opposite ends of the exhaust pipe 920.
    In other words, the support sleeve 925 is positioned inside the exhaust pipe 920.and located at a distance from each of the first and second opposite endsof the exhaust pipe 920.
    As with the eighth embodiment, this embodiment addresses the possiblein the event that the exhaust pipe 920 gets stuck only partially inserted in the counter-bore 6e2610due to high frictional engagement of the lower section of the exhaust pipe 920 ithe counterbore 6e. This embodiment does not resist stretchingthe exhaust pipe 920 below the support sleeve 925. About the bottom valve assembly 900meets significant frictional resistance during insertion of the bottom valve 900 incounter-bore 6e, the lower section of the exhaust pipe 920 may yield toallow continued insertion of the bottom valve assembly 900. The support sleeve 925 willto resist deformation of the exhaust pipe wall between the support sleeve andthe counterbore 6e as soon as the bottom valve assembly 900 is fully inserted.
    Thus, the invention provides, among other things, a procedure and adevice for securing a cylindrical element in a bore in a component forand DTH. Various characteristic features and advantages of the invention are presented inthe following claims.27
    权利要求:
    Claims (1)
    [1]
    A holding unit for a cylindrical element in a DTH drill, which comprises a component comprising a component bore, which has a diameter for a component bore, the assembly comprising a cylindrical element (120, 220, 320, 420, 520, 620, 720, 820, 920), which has an outer diameter for a cylindrical element which is larger than the diameter of the component bore (6e) and including a bore for a cylindrical element, which defines an inner diameter for a cylindrical element, the cylindrical element having a rigidity lined a cylindrical element; characterized by a support sleeve (125, 225, 325, 425, 525, 625, 725, 825, 925) which has an outer sleeve diameter which is smaller than the inner diameter of the cylindrical member and which is inserted into the bore of the cylindrical member to form a cylindrical element and a sleeve unit, at least a section of the support sleeve having a stiffness which is greater than the stiffness of the cylindrical element; and in that the cylindrical element and the sleeve unit are inserted into the component bore (6e) in such a way that the cylindrical element (120, 220, 320, 420, 520, 620, 720, 820, 920) is deformed against the support sleeve (125, 225 , 325, 425, 525, 625, 725, 825, 925) were fitted inside the component bore (6e) so that the cylindrical member is firmly clamped between the support sleeve and the component bore (6e).
    The assembly of claim 1, wherein the component for the DTH includes a drill bit (6); wherein the cylindrical member (120, 220, 320, 420, 520, 620, 720, 820, 920) includes an exhaust pipe; wherein the bore of the cylindrical element comprises a bore in the exhaust pipe; and wherein the cylindrical member and support sleeve assembly defines a bottom valve assembly (100, 200, 300, 400, 500, 600, 700, 800, 900) for the DTH, the bottom valve assembly being adapted to be alternately inserted and disconnected from at least one chamber for the DTH for the fate of the drive through the blow-through of the exhaust pipe.
    The assembly of claim 1, wherein the cylindrical member and support sleeve assembly includes a gap (195, 617) between the support sleeve and the bore of the cylindrical member prior to insertion of the cylindrical member and support sleeve assembly into the component bore 28 (15e); and wherein deformation of the cylindrical member during insertion into the component bore (6e) closes the gap (195, 617) and causes the cylindrical member to apply pressure to the support sleeve.
    An assembly according to claim 1, wherein the inner surface of the cylindrical member defines an inner diameter of a cylindrical member; and the support sleeve includes an outer surface, which they fi deny the outer diameter of a support sleeve, a large diameter section of the support sleeve having an outer diameter which is larger than the inner diameter of a smaller diameter section of the generally cylindrical member; wherein the support sleeve is adapted for insertion into the component bore to define a gap between at least a section of the outer surface of the support sleeve and the component bore; wherein the generally cylindrical element is adapted for insertion into the gap between the outer surface of the support sleeve and the component bore; and wherein the generally cylindrical member is adapted to be deformed after the smaller diameter section of the generally cylindrical member is forced over the larger diameter section of the support sleeve, such deformation of the cylindrical member filling the gap and clamping the generally cylindrical member. the element between the support sleeve and the component bore.
    The assembly of claim 4, wherein the support sleeve includes a beveled surface (170) to facilitate insertion of the generally cylindrical member into the gap.
    An assembly according to claim 4, wherein the component bore (6e) is conical; wherein the outer and inner surfaces of the generally cylindrical member (335, 435, 535, 835, 935) are conical; and wherein the outer surface of the support sleeves (325, 425, 525, 825, 925) is conical.
    An assembly according to claim 1, wherein the component bore (6e) comprises a shoulder (6g), against which at least the support sleeve abuts, when the generally cylindrical element is clamped between the support sleeve and the component bore. 29 10 15 20 25 30
    The assembly of claim 1, wherein the support sleeve includes a section of a first stiffness and a section of a second stiffness that is lower than the first stiffness; wherein the section of a second stiffness is deformed during the insertion of the generally cylindrical element into the gap; and wherein the generally cylindrical member is clamped between the first rigidity section and the component bore.
    The assembly of claim 1, wherein the bore of the cylindrical member extends through the cylindrical member from a first end of the cylindrical member to a second end which is located opposite the first end; wherein the bore of the cylindrical member includes a smaller diameter section (130) between the first end and a transition point and a larger diameter section (135) between the transition point and the second end; and wherein the support sleeve (125) is inserted into the larger diameter section (135) for drilling the cylindrical member to form the cylindrical member and sleeve assembly.
    The assembly of claim 1, wherein the cylindrical member (120, 920) includes a stop rim (155, 955); wherein the stop rim defines an opening having a smaller diameter than the outer sleeve diameter, so that the stop rim (155, 955), after insertion of the support sleeve (125, 925) into the bore of the cylindrical element, engages a section of the support sleeve to resist a removing the support sleeve from the bore of the cylindrical member. The assembly of claim 10, wherein the support sleeve (125) includes a beveled surface (170) to facilitate insertion of the support sleeve through the opening as they are avnioned by the stop rim (155).
    The assembly of claim 10, wherein the support sleeve includes a cutout (185) that mates with the stop rim (155) after insertion of the support sleeves into the bore of the cylindrical member. 30 10 15 20 25 30
    The assembly of claim 10, wherein the stop rim (155) includes one end (135) of the cylindrical member (120); and wherein one end of the support sleeve is engaged with the stop rim (155) to maintain one end of the support sleeve adjacent the end of the cylindrical member.
    The assembly of claim 10, wherein the cylindrical member (120) includes first and second opposite ends and the support sleeve (125) includes first and second opposite ends; and wherein the stop rim (155) is positioned within the bore of the cylindrical member in such a manner that each of the first and second opposite ends of the support sleeve is located between and is spaced apart from each of the first and second opposite ends of the cylindrical member. the element.
    The assembly of claim 1, wherein a wall of at least one of the cylindrical member (320) and support sleeve (325) is conical.
    An assembly according to claim 1, wherein the component bore comprises an abutment (Ög), against which both the cylindrical element and the support sleeve abut after the insertion of the cylindrical element and the support sleeve unit into the component bore (6e).
    The assembly of claim 1, wherein the support sleeve includes a longitudinally extending slot (510) as they are terminated by longitudinally extending free ends; and wherein deformation of the cylindrical member or the insertion of the cylindrical member and the support sleeve assembly into the component bore applies pressure to the support sleeve, which is sufficient to contact the free ends (515) and close the longitudinally extending gap; and wherein the contact between the free ends enables the support sleeve to withstand additional pressure applied by the cylindrical element to the support sleeve in such a way that further deformation of the cylindrical element occurs after the free ends have come into contact.
    The assembly of claim 1, wherein the support sleeve (625) defines a non-circular cross-section and the cylindrical bore defining a circular cross-section; and wherein after the insertion of the cylindrical element (620) and the support sleeve assembly into the component housing, the support sleeve 31 is forced into a circular cross-section under pressure applied by the cylindrical element.
    The assembly of claim 18, wherein the non-circular cross-section of the support sleeve (625) defines an oval having a major axis (610) and a minor axis (615); the support sleeve coming into contact with a surface of the bore of the cylindrical element at the major axis of the support sleeve after the insertion of the support sleeve into the bore of the cylindrical element; and wherein the contact between the support sleeve and a surface of the bore of the cylindrical element creates a press fit between the support sleeve and the surface of the bore of the cylindrical element, which is sufficient to resist a removal of the support sleeve from the cylindrical element and the sleeve unit.
    The assembly of claim 1, wherein the support sleeve (825) includes a section of a first stiffness and a section of a second stiffness that is lower than the first stiffness; wherein the section of a second stiffness is deformed during the insertion of the cylindrical element and the sleeve unit into the component bore; and wherein the cylindrical member (820) is firmly clamped between the section of the first rigidity and the component bore.
    The device of claim 20, wherein the section of a second stiffness includes stiffness reducing characteristic features.
    The assembly of claim 20, wherein the section of a second rigidity includes at least one of a slot, a hole and protrusions (810, 815).
    A method of inserting a cylindrical element (120, 220, 320, 420, 520, 620, 720, 820, 920) into a bore (6e) of a component (6) of a DTH, the bore having a diameter for a component bore, the method comprising: (a) providing a cylindrical member including a bore for a cylindrical member and having a rigidity for a cylindrical member; (B) providing a support sleeve (125, 225, 325, 425, 525, 625, 725, 825, 925) having an outer surface, at least a portion of the support sleeve having a stiffness greater than the rigidity of the cylindrical element; (b) inserting the support sleeve into the bore of the cylindrical member; and (c) inserting the cylindrical member and sleeve assembly into the component bore and deforming the cylindrical member against the component bore and the outer surface of the support sleeve to firmly clamp the cylindrical member between the support sleeve and the component bore.
    A method according to claim 23, wherein step (b ') comprises the fi initiating of a gap between the outer surface of the support sleeve and the bore of the cylindrical element; and wherein step (c) involves deforming the cylindrical member to close the gap and apply pressure to the support sleeve.
    The method of claim 23, wherein step (a) comprises providing a stop rim (155, 955) in the cylindrical member, the stop rim defining an opening less than an outer diameter of at least a portion of the outer surface of the support sleeve; and wherein step (b °) comprises resistance to a removal of the support sleeve from the bore of the cylindrical element with the stop rim.
    The method of claim 25, wherein step (b) comprises providing a cutout (185, 585, 685) in the support sleeve; and wherein resistance to a removal of the support sleeve from the bore of the cylindrical member includes engaging the cut-out of the support sleeve with the stop rim.
    The method of claim 25, wherein providing a stop rim includes positioning the stop rim (155, 955) at one end of the cylindrical member, and wherein resisting a removal of the support sleeve comprises maintaining one end of the support sleeve adjacent the end of the cylindrical member. . 33 10 15 20 25 30
    The method of claim 25, wherein step (a) comprises providing a cylindrical member having first and second opposite ends; wherein step (b) comprises providing a support sleeve having first and second opposite ends; and wherein resistance to removal of the support sleeve includes maintaining each of the first and second opposite ends of the support sleeve in a position spaced between and separated by a distance from each of the first and second opposite ends of the cylindrical member.
    The method of claim 23, wherein step (a) comprises the annealing of a circular cross-section with the bore of the cylindrical member; wherein step (b) comprises the fi annealing of a non-circular cross-section with the outer surface of the support sleeve (625); and wherein step (c) comprises forcing the outer surface of the support sleeve to assume a circular cross section under pressure applied by the cylindrical member (620) to deformation against the support sleeve.
    The method of claim 29, wherein step (b) comprises the fi engaging with the cross section of the outer surface of the support sleeve an oval having a major axis (610) and a minor axis (615); wherein step (b ") comprises contacting the bore of the cylindrical member with the support sleeve at the major axis to create a pressing engagement between the support sleeve and the bore of the cylindrical member, which is sufficient to resist a removal of the support sleeve from the bore of the cylindrical member.
    The method of claim 23, wherein at least one of steps (a) and (b) comprises providing a conical surface (170) in at least one of the cylindrical member and the support sleeve.
    The method of claim 23, wherein the component bore de defines a shoulder (6g) at its bottom; and wherein step (c) comprises abutting at least one of the cylindrical member and the support sleeve against the shoulder of the component bore.
    The method of claim 23, wherein step (b) comprises providing a longitudinally extending slot (510) as defined by longitudinally extending free ends (515) in the support sleeve; wherein step (c) involves deforming the cylindrical member (520) to apply pressure to the support sleeve (525), which is sufficient to contact the free ends and close the longitudinally extending gap; and wherein step (c) further comprises further deforming the cylindrical member against the support sleeve after the free ends are in contact.
    The method of claim 23, wherein step (b) comprises providing a support sleeve (825) comprising a section of a first stiffness and a section of a second stiffness which is lower than the first stiffness; wherein step (c) involves deforming the section of a second rigidity and firmly clamping the cylindrical member (820) between the section of a first rigidity and the component bore.
    The method of claim 34, wherein step (b) further comprises providing the section of a second stiffness with stiffness-reducing characteristic features (815) in the support sleeve.
    The method of claim 34, wherein step (b) further comprises providing at least one of grooves, holes and protrusions (810, 815) in the section of a second rigidity.
    The method of claim 37, wherein step (a) comprises providing a cylindrical member having a substantially cylindrical section and the nersing in the bore of the cylindrical member a smaller diameter section; wherein step (b) comprises providing a larger diameter section for the outer surface of the support sleeve, the larger diameter section having a diameter which is larger than the smaller diameter section; wherein step (c) involves inserting the support sleeve into the component housing to form a gap between at least a section of the outer surface of the support sleeve and the component bore, inserting the substantially cylindrical section into the gap and deforming the substantially cylindrical section or section of smaller diameter. for the cylindrical element is forced over the larger diameter section of the support sleeve. 35
    The method of claim 38, wherein the component bore is conical; wherein step (a) comprises providing conical inner and outer surfaces of the substantially cylindrical section; and wherein step (b) comprises providing a conical outer surface of the support sleeve. 36
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2022003253A1|2020-07-03|2022-01-06|Robit Plc|A drill assembly for percussive drilling|
    法律状态:
    2015-03-31| NAV| Patent application has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    US12/729,828|US8561730B2|2010-03-23|2010-03-23|Foot valve assembly for a down hole drill|
    PCT/US2011/028838|WO2011119408A2|2010-03-23|2011-03-17|Foot valve assembly for a down hole drill|
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