• 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:
    A fusion welding socket for coupling together double walled plastic conduits including an inner pipe, an outer pipe surrounding the inner pipe and an annular space arranged between the inner and outer pipes. The fusion welding socket includes a main body comprising a first end portion, a second end portion and an intermediate portion. The intermediate portion has at least one inner diameter which is smaller than the inner diameters of the first and second end portions. Three heating coils are embedded in the first end portion, the second end portion and the intermediate portion, respectively, for fusing together the first and second end portions with a respective outer pipe of a first and second conduit and the intermediate portion with a respective inner pipe of the first and second conduit. A passageway includes an annular space is arranged to connect the annular spaces of the first and second conduit after fusion.
    公开号:SE1150170A1
    申请号:SE1150170
    申请日:2011-02-25
    公开日:2012-08-26
    发明作者:Thomas Andersson
    申请人:Kungsoers Plast Ab；
    IPC主号:
    专利说明:

    lO l Fusion welding socket Field of the invention The present invention relates to a fusion welding socketfor coupling together double walled plastic conduits. Thefusion welding socket is adapted to receive the ends ofouter and inner pipes of the double walled conduits to bejoined together with a close fit and incorporates coils ofresistance wires or filaments which, when energized causethe material in the welding socket to fuse together withthe material in the outer and inner pipes at the positions of said coils.
    Background and prior art Fusion welding sockets are used generally in joiningtogether plastic pipes and in connecting plastic pipes topipe bends, T-pieces and the like. The welding sockets areusually provided with inwardly projecting shoulders intheir center regions and incorporate a resistance coil oneach side of the shoulders. When joining two pipestogether, the pipe ends can be inserted into the socketuntil stopped by the shoulders. The person coupling thepipes will then know that the pipes have been centeredcorrectly in the socket. A voltage source is thenconnected to the coils. The material in the inner surfaceof the socket and in contact with the material at the pipeends will therewith fuse together locally as a result of the heat generated in the resistance wires.
    This represents a very simple and effective method ofjoining together simple pipe conduits. Many installations,for instance gasoline transporting installations, require the use of double walled conduits, i.e. conduits whichinclude two coaxial pipes and which are constructed so asto provide an annular space between the radially inner and the radially outer pipe. Such an annular space of a double lO 2 walled conduit is sometimes referred to as a secondarycontainment. The annular space is used to detect anyleakage that may occur in the inner or the outer pipe, inaddition to enhancing safety against leakage onto thesurrounding ground.
    To this end, the space may contain a gas, suitably air that has a pressure in excess of orbelow the ambient pressure. The occurrence of a leakagecan be detected, by monitoring the pressure in said space.It is important that pressure changes in the space betweenthe pipes are able to propagate along the full length of amonitoring zone in a conduit system or pipework. Whenjoining such pipes, the inner pipe must be joined per seand the outer pipe must be joined per se, such thatcommunication is also obtained between the annular spaces in the mutually joined double conduits.
    EP l 062 454 A discloses a previously known electro fusioncoupler for joining together double walled conduits. Thisknown coupler has a larger diameter at its ends than alongan intermediate part thereof. The diameter at said ends isadapted to receive an outer pipe with a close fit and thediameter along said intermediate part is adapted toreceive with a close fit an inner pipe of a double-walledconduit that includes two coaxial pipes and a leakagedetection space between said pipes. The socket includesheating coils of resistance wires or filaments that whenenergized function to locally fuse the socket materialwith the material of both the outer pipes and the innerpipes in two double-pipe conduits to be joined togetherwith the aid of the fusion welding socket. The fusionwelding socket is further provided with a number ofpassageways arranged in the intermediate part forconnecting together the leakage detection spaces of thetwo conduits. These passageways are formed as longitudinal cylindrical through holes drilled in the intermediate part lO 3 or as two to four narrow tubular elements, such as steeltubes that arranged longitudinally in the intermediatepart by being moulded into the socket during manufacturing.
    Brief description of the inventionAn object of the invention is to provide an enhancedfusion welding socket for coupling together double walled plastic conduits.
    Another object is to provide such a fusion welding socketwhich enhances the security of double walled conduitinstallations at which any number of double walledconduits have been joined together by means of a corresponding number of such fusion welding sockets.
    It is an additional object to provide such a fusionwelding socket which ensures that a double walled conduitinstallation comprising any number of double walledconduits joined together by means of a correspondingnumber of such fusion welding sockets will exhibit anannular space or a secondary containment over the entire length of the installation.
    Another object is to provide such a fusion welding socketwhich to a high degree ensures a reliable communicationbetween the annular spaces of the double walled conduits which are joined together.
    A further object is to provide such a fusion weldingsocket which causes only a comparatively low pressure dropto a medium flowing through the socket, between the annular spaces of the two conduits.
    An additional object is to provide such a fusion weldingsocket which ensures a reliable and leakage proof connection of two double walled conduits.
    Still a further object is to provide such a fusion welding lO 4socket which is easy to install.
    Yet another object is to provide such a fusion weldingsocket which may be readily manufactured at a comparatively low cost.
    These and other objects are provided by a fusion weldingsocket of the kind as set out in the preamble of claim l,which fusion welding socket exhibits the special technicalfeatures specified in the characterizing portion of the claim.
    The fusion welding socket according to the invention isintended for coupling together double walled plasticconduits, which double walled conduits comprise an innerpipe, an outer pipe surrounding the inner pipe and anannular space arranged between the inner and outer pipes.The fusion welding socket comprises a main body comprisinga first end portion, a second end portion and anintermediate portion arranged longitudinally between thefirst and second end portions, which intermediate portionhas at least one inner diameter which is smaller than theinner diameters of the first and second end portions.First, second and third heating coils are embedded in thefirst end portion, the second end portion and theintermediate portion respectively, for fusing together thefirst and second end portions with a respective outer pipeof a first and second conduit and the intermediate portionwith a respective inner pipe of the first and secondconduit. A passageway is arranged to connect the annularspaces of the first and second conduit after fusion.According to the invention, the passageway comprises anannular passage which circumferentially surrounds theintermediate portion and which extends longitudinally overthe entire intermediate portion and at least partially over the first and second end portions.
    Reference in the following and in the claims to a pipecoupling and pipe joining operation implies joiningtogether two double-pipe conduits and joining of one suchconduit to a joint piece, a pipe bend and the like thatinclude double-pipes or pipes provided with passageways inthe walls thereof with the intention of providingrequisite communication with the space between the pipes in a double-pipe conduit.
    A fusion welding socket of this kind enables, forinstance, two double-pipe conduits to be joined togetherwith the aid of one single component and also enables allnecessary fusion welding operations to be carried out inone single step, by connecting an outer voltage source totwo terminals on the socket. This greatly facilitates thework that is entailed in joining together double-pipeconduits, and also makes the work less expensive. Further-more, the use of a single welding socket also enables acheck to be made as to whether or not the inner pipe has been welded correctly, from outside the conduit.
    By arranging the passageway for connecting the annularspaces of two conduits such that it comprises an annularpassage which surrounds the intermediate portion and whichextends longitudinally over the entire length of theintermediate portion and at least partially over both endportions, the passageway will longitudinally overlap theannular space of both double walled conduits that areconnected by means of the socket. Hereby, it is assuredthat any puncture, leakage or other fracture, either fromthe outside or from the inside, will debouch into thesecondary containment of the conduit installation,irrespective of if such fracture occurs in the conduits orin the fusion welding socket. With the inventive fusionwelding socket, a secondary containment will be formed along the entire length of an conduit installation wherein 6 several any number of double walled conduit have beenjoined by a corresponding number of fusion weldingsockets. By this means the security in regard of leakageat double walled conduit installations is greatly enhanced.
    Additionally, the passageway may readily be arranged witha comparatively large cross sectional area. This entailsfor several advantages. Firstly, such a large crosssectional area of the passageway reduces the risk of thatthe passageway is clogged by foreign material that mightenter into the passageway. Secondly, by means of a largecross sectional area, the fusion welding socket willpresent only a comparatively small flow resistance to themedia flowing from the annular space of one conduit to theother. Thereby, the socket will present only acomparatively small pressure drop with regard to the mediatransported by the conduits' annular spaces. The largecross sectional flow area thus ensures a reliabletransportation of media in the conduits' annular spacesand pressure communication there-between also atcomparatively long conduit installations, where a largenumber of conduits have been joined together by acorresponding large number of fusion welding sockets.Thirdly, the annular arrangement of the passageway entailsfor that a large cross sectional flow area may be readilyachieved by means of a fusion welding socket which iscomparatively simple in construction, reliable in use,easy to handle and install and which may be manufactured at a comparatively low cost.
    Communication between the annular spaces of the conduits and the annular passage of the socket may be readily accomplished by means of channels arranged through the main body, which channels connect a space arranged 7 radially inside each of the first and second end portions with the annular passage.
    The channels may comprise at least one slit which isarranged through the main body and which defines asmallest opening area through the main body. Such a slitprovides a reliable communication and is comparatively easy to arrange in the main body.
    The at least one slit may define a generally rectangularopening area in the main body. By this means, acomparatively large communication opening may be providedwithout adversely affecting the structural strength of the welding socket.
    O The smallest opening area is preferably larger than 50 6of a largest radial cross sectional area of the annularpassage. Hereby, a reliable communication also through the slit is accomplished.
    The slit may define a smallest opening area which extendscircumferentially through the main body between lO° and80°. Also this ensures a reliable communication through the slit.
    The passageway may comprise two radially opposing slitsarranged through the main body at each of the first andsecond ends. Hereby an even larger communication area through the main body may be provided without adverselyaffecting the structural strength of the welding socket.
    Alternatively the channels may comprise a plurality oftubular ducts arranged through a respective end portion ofthe intermediate portion of the main body. This allows fora comparatively simple manufacturing of the welding socket.
    The channels may be inclined in relation to the longitudinal axis of the main body. By this means 8 communication between the annular spaces of the conduitsand the annular passage of the welding socket is readily achieved in a simple manner.
    The annular passage may be defined by the main body and anouter sleeve which surrounds the main body and whichextends longitudinally over the intermediate portion. Thisentails for an easy manufacturing of the socket at a comparatively low cost.
    The main body and the outer sleeve may be formed as anintegral part. By this means the welding socket may bemanufactured by a comparatively low number ofmanufacturing operations. The integral part arrangementmay also enhance the structural strength of the welding socket.
    Alternatively, the main body and the outer sleeve may beformed of separate components. Hereby, the use ofdifferent materials in the main body and the sleeve is facilitated, if so desired.
    The fusion welding socket may comprise fourth heatingcoils arranged for fusing together the main body with theouter sleeve. By this means it is possible to inspect, bylooking through the slit arranged in the main body, thatthe conduits a properly inserted in the welding socketbefore positioning the sleeve around the main body.Thereafter, the conduits may be fused together with thewelding socket simultaneously with fusing together the sleeve with the main body in a single fusing operation.
    Further objects and advantages of the invention will beapparent from the following detailed description of embodiments and from the appended claims.
    Brief description of the drawings Below exemplifying embodiments of the invention will now 9 be described in more detail with reference to the figures in which: Fig. 1 is a longitudinal section at lines A-A of fig. 2through a fusion welding socket according to one embodiment of the invention.
    Fig 2 is an end view of the fusion welding socket shown in fig. 1.Fig. 3 is a cross section at line B-B of fig 1.Fig. 4 is a cross section at line C-C of fig. 1.
    Fig. 5 is a longitudinal section through a fusion welding socket according to another embodiment of the invention.
    Fig. 6 is a plan view, partly in section of the fusion welding socket shown in fig. 5.
    Fig. 7 is a plan view of a fusion welding socket according to a further embodiment of the invention.Fig. 8 is a section along line A-A in fig 7.
    Fig. 9 is a section along line B-B in fig 7.
    Detailed description of embodiments Figures 1-4 illustrates the use of a fusion welding socket30 according to a first embodiment of the invention, injoining two double-walled conduits 10, 20 each includingan outer pipe 11, 21, an inner pipe 12, 22 and anintermediate annular space 13, 23. The socket 30 comprisesa tubular main body 31 made of polyethylene, PE. The mainbody may however also be made of other heat fusiblepolymer materials such as polyamide, PA or the like. Themain body 31 includes a first end-portion 32 and a secondend portion 33. The end portions 32, 33 have the sameinner diameter, which diameter permits the outer pipes 11,21 to be fitted in a respective end portion 32, 33, with a close fit. An intermediate portion 34 of the main body 31 lO is arranged longitudinally between the two end portions32, 33. The intermediate portion 34 has an inner diameter,which is smaller that the inner diameter of the endportions 32, 33 and receives the inner pipes l2, 22 with aclose fit. Hence, the exemplifying embodiment of thewelding socket is arranged for joining together two doublewalled conduits at which the outer pipes have mutually thesame outer diameter and the inner pipes have mutually thesame outer diameter. However, it is also possible toarrange the end portions of the socket's main body withmutually different inner diameters such that these endportions may receive outer pipes having different outerdiameters. Likewise, it is possible to arrange theintermediate part such that it exhibits different innerdiameters at a respective end of the intermediate portion,for allowing inner pipes of mutually different outer diameters to be received therein.
    A first heating coil 35a is embedded, by moulding, in thefirst end portion 32, in proximity to the inner surfacethereof. In a corresponding manner, a second heating coil35b is embedded in the second end portion 33. A thirdheating coil 35c, 35d is embedded in the intermediateportion 34. In the shown embodiment, the third heatingcoil is divided longitudinally into two separate coilsections 35c and 35d respectively. The first 35a, second35b and third 35c-d coils are electrically connected inseries such that they form an electrical circuit. Theelectrical circuit comprises two end terminals (not shown)that are arranged in a respective terminal sleeve 36a, 36bwhich sleeves protrude radially outwardly from the outersurface of the main body 3l, at it's second end portion33. In the embodiment shown in figs. l-4, the two terminalsleeves 36a, 36b are arranged side by side on the in the same radial plane of the main body 3l. ll The socket also comprises an inner distance sleeve 37,which is intended to be arranged inside mutually proximateend portions of the inner pipes l2, 22. The distancesleeve 37 is generally cylindrical and is, at itslongitudinal center, provided with a radially outwardlyprotruding circumferential flange 37a. The distance sleeve37 comprises an electrically conductive material whichensures that electrically conductive inner layers (notshown) of the two inner pipes are electrically connectedto each other. The circumferential flange 37a serves astop for the end faces of the inner pipes l2, 22 andfacilitates correct positioning of the inner pipes l2, 22, when they are introduced into the welding socket 30.
    The welding socket 30 also comprises a cylindrical outersleeve 38. In the embodiments illustrated in the drawings,the outer sleeve 38 and the main body 34 have beenmanufactured as separate components. The outer sleeve isformed of polyethylene, PE. The outer sleeve may howeveralso be made of other heat fusible polymer materials suchas polyamide, PA or the like. The outer sleeve 38 isarranged coaxially outside the main body 34 and surroundsentirely and sealingly the intermediate portion 34 of themain body. The outer sleeve 38 and the main body 34 aresealingly joined together at both their respective endportions. For this reason the outer sleeve has in innerdiameter which essentially corresponds to the outerdiameter of the main body's end portions 32, 33. In theexample shown in figs. l-4, the outer sleeve has beensealingly joined with main body 34, by means of a heatfusion operation during manufacturing of the weldingsocket 30. The outer sleeve may however also be joined tothe main body 34 during manufacturing by other means andmethods, such as by gluing or the like. It is also possible that the outer sleeve and the main body are l2 formed as an integral part during manufacturing, e.g. by simultaneous moulding in a common mould.
    As a further alternative the outer sleeve and the mainbody may be manufactured and transported to theinstallation site as separate components. The outer sleevemay then be sealingly joined to the main body by means ofa fourth heating coil (not shown) which is embedded inproximity to the outer surfaces of the main body's endportions, and which may be electrically connected inseries with the first, second and third heating coils. Bythis means it is possible, during usage of the weldingsocket, to first insert the inner and outer pipes of thetwo conduits into the main body, without the outer sleevebeing positioned radially outside the intermediateportion. Correct insertion of the pipes may then beverified by inspection through channels that are arrangedthrough the main body (as described further in detailbelow). When correct insertion of the pipes has beenverified the outer sleeve may be displaced longitudinallyalong the main body to a position which corresponds to theposition as indicated in fig. l. Such longitudinal oraxial displacement of the outer sleeve is made possible bythe two protruding terminal sleeves being arranged in acommon radial plane at one end of the main body. Once thepipes and the outer sleeve have been correctly positionedall pipes and the outer sleeve may simultaneously bejoined to the main body by connecting a voltage source tothe end terminals and simultaneously supplying electricalpower to the first, second, third and fourth heating coils.
    Irrespective of which of the above mentioned methods isused for sealingly joining the outer sleeve 38 with themain body 31, the main body and the outer sleeve jointly defines an annular passage which is arranged radially 13 outside of the main body's intermediate portion 34. Theannular passage 39 surrounds the intermediate portionentirely in the circumferential direction. The annularpassage 39 further extends longitudinally over the entirelength of the intermediate portion 34. The annular passage39 further extends longitudinally over a portion of eachend portions 32, 33. By this means the annular passagewill overlap the end portions of the outer pipes 11, 21,when these are correctly inserted into the welding socket .
    As best seen in figs 1 and 3, the main body 31 is providedwith through penetrating slits 41, 42, 43. The slits formchannels through the main body 31 and connect a spacearranged radially inside each of the first 32 and second33 end portions with the annular passage 39. At theembodiment shown in figs. 1-4, the channels 41, 42, 43 areare arranged at inclined bridging portions 32a, 33a of themain body 31, which bridging portions 32a, 33a connect theintermediate portion 34 with the respective end portions32, 33. At each such bridging portion 32a, 33a a pair ofradially opposing channels 41, 42, 43, are arranged. Eachchannel 41, 42, 43 defines a rectangular opening area,which in the shown embodiment is constant over the radiallength of each channel 41, 42, 43. The total opening areadefined by both channels at each bridging portioncorresponds to approximately 100 % of the smallest crosssectional area of that part of the annular passage whichis arranged between said bridging portions 32a, 33a. Theopening area of each channel 41, 42, 43 extends circumferentially over an angle d of approximately 30°.
    The so arranged channels 41, 42, 43 ensure a reliablemedium communication between the annular space 13, 23 ofeach conduit 10, 20 with the annular passage 39 arranged in the welding socket. The arrangement of the annular 14 passage 39 and the channels 41, 42, 43 further provide areliable communication between the annular spaces 13, 23of two conduits 10, 20 joined together by means of thefusion welding socket 30. The passageway formed by theannular passage and the channels present a small pressuredrop and reduces the risk of foreign material to clog orin any other way impede the free transport of medium orthe propagation of any pressure change that may occur atany position of the total conduit installation. By thismeans a reliable leakage detection may readily beachieved, also at long conduit installations where a largeamount of conduits have been joined together by a correspondingly large number of fusion welding sockets.
    Figures 5 and 6 illustrate an alternative embodiment ofthe welding socket according to the invention. In thesefigures components of the welding socket which correspondsto the embodiment shown in figs. 1-4 have been given thesame reference numbers added by 100. The welding socket130 comprises a main body 131 and an outer sleeve 138. Theouter sleeve is arranged between two longitudinally spacedradially protruding terminal sleeves 136a, 136b, in whichterminal sleeves a respective end terminal 136c, 136d isarranged. The end terminals 136c, 136d are electricallyconnected to an electrical circuit comprising a first, asecond and a third heating coil, which are not shown infigs. 4 and 5. The main body 131 comprises a first endportion 132 which receives one outer pipe 111, a secondend portion 133 which receives another outer pipe 121 andan intermediate portion 134 which receives two inner pipes112, 122. An inner sleeve 137 is arranged inside the innerpipes 112, 122 and a radially protruding circumferentialflange 137a is arranged between and in contact with end surfaces of the inner pipes 112, 122.
    The outer sleeve 138 is sealingly joined to the outside of the end portions 132, 133 of the main body 131. The outersleeve 138 and the main body 131 define them-between anannular passage 139, which extends circumferentiallyaround the entire intermediate portion 134 andlongitudinally over the entire length of the intermediate portion 134 and partially over the end portions 132, 133.
    The embodiment shown in figs 5 and 6 differs from theembodiment shown in figs. 1-4 mainly by the arrangement ofchannels 141, 142, 143, 144 which are arranged through themain body 131. At this embodiment the channels 141-144 areformed as a plurality of tubular ducts which are drilledthrough the main body 131. The tubular ducts may howeveralso be formed by other means, e.g. by embedding tubularpipes or by creating tubular voids during moulding of themain body 131. In the shown example, two channels arearranged at each end of the intermediate portion 134 ofthe main body, i.e. in proximity to a respective endportion 132, 133 of the main body. Each channel 141-144 isinclined relative to the longitudinal axis of the mainbody 131, such that they form a respective communicationbetween the annular passage 139 and a space arrangedradially inside of the end portions 132, 133. By thismeans the channels 141-144 will constitute communicationchannels between the annular spaces 113, 123 of each ofthe conduits and the annular passage 139. The number ofchannels 141-144 arranged at each end of the main body 131and the cross sectional area of each channel is chosensuch as to ensure a reliable communication, presenting acomparatively low pressure drop between the annular spaces113, 123 of the conduits 110, 120 and the annular passageof the welding socket 130.
    Figures 7-9 illustrate a further exemplifying embodimentof the welding socket according to the invention. In these figures components of the welding socket which corresponds 16 to the embodiment shown in figs. 1-4 have been given thesame reference numbers added by 200. At this embodimentthe welding socket constitutes a 90° conduit bend. Thewelding socket 230 comprises a main body 231 and an outersleeve 238. The main body 231 comprises a first endportion 232 which receives one outer pipe 211, a secondend portion 233 which receives another outer pipe 221 andan intermediate portion 234 which receives two inner pipes212, 222. An inner bent sleeve 237 is arranged inside theinner pipes 212, 222. Two radially protrudingcircumferential flanges 237a, 237b are arranged betweenand in contact with the end surface of a respective inner pipe 212, 222 and the main body 231.
    The outer sleeve 238 is sealingly joined to the outside ofthe end portions 232, 233 of the main body 231. The outersleeve 238 and the main body 231 define them-between anannular passage 239, which extends circumferentiallyaround the entire intermediate portion 234. The annularpassage further extends over the entire bent length of theintermediate portion 234 and partially over the first 232 and second 233 end portions.
    Communication between the annular passage 239 and theannular spaces 213, 223 arranged between the outer 211,221 and inner 212, 222 pipes of each conduit is providedby means of channels in the form of slits 241, 242 (seefig. 9) arranged through the main body 231. In theillustrated example each slit 241, 242 is formed as aradially and circumferentially extending slit through themain body 231. Each slit 241, 242 forms a rectangularopening through the main body 231. Two such slits 241, 242are arranged mutually opposing at each end portion 232,233, adjacent to the intermediate portion 234. It ishowever possible that the communicating channels, also at embodiments where the socket forms a conduit bend, are l7 formed as radially or transversely arranged tubular ducts (not shown).
    Above exemplifying embodiments of a fusion welding socketaccording to the invention have been described. Theinvention is however not limited to these embodiments. Tothe contrary the invention may be freely varied within thescope of the appended claims. The fusion welding socketmay e.g. be arranged and used for connecting a doublewalled conduit to other double walled elements such asconduit bends other than 90° bends, terminating sockets, connecting sockets, reduction elements, and so on.
    权利要求:
    Claims (13)
    [1] 1. A fusion welding socket (30, 130, 230) for couplingtogether double walled plastic conduits (10, 20, 110,120), which double walled conduits comprise an inner pipe(12, 22, 112, 122, 212, 222), an outer pipe (11, 21, 111,121, 211, 221) surrounding the inner pipe and an annularspace (13, 23, 113, 123, 213, 223) arranged between theinner and outer pipes, which fusion welding socketcomprises - a main body (31, 131, 231) comprising a first endportion (32, 132, 232), a second end portion (33, 133,233) and an intermediate portion (34, 134, 234) arrangedlongitudinally between the first and second end portions,which intermediate portion has at least one inner diameterwhich is smaller than the inner diameters of the first andsecond end portions; - first (35a), second (35b) and third (35c-d) heatingcoils embedded in the first end portion, the second endportion and the intermediate portion respectively forfusing together the first and second end portions with arespective outer pipe of a first and second conduit andthe intermediate portion with a respective inner pipe ofthe first and second conduit; and - a passageway (39, 41-43, 139, 141-144, 239, 241-242)which is arranged to connect the annular spaces of thefirst and second conduit after fusion, characterized inthat the passageway comprises an annular passage (39, 139, 239)which circumferentially surrounds the main body (31, 131,231) and which extends longitudinally over the entireintermediate portion and at least partially over each ofthe first (32, 132, 232) and second (33, 133, 233) end portions. 19
    [2] 2. A fusion welding socket according to claim 1, whereinthe passageway comprises channels (41-43, 141-144, 241-242) arranged through the main body (31, 131, 231), whichchannels connect a space arranged radially inside each ofthe first (32, 132, 232) and second (33, 133, 233) endportions with the annular passage (39, 139, 239).
    [3] 3. A fusion welding socket according to claim 2, whereinthe channels (41-43, 241-242) comprise at least one slitwhich is arranged through the main body (31,231) and which defines a smallest opening area through the main body.
    [4] 4. A fusion welding socket according the claim 3,wherein the slit defines a generally rectangular openingarea in the main body (31, 231).
    [5] 5. A fusion welding socket according to claim 3 or 4,wherein the smallest opening area is larger than 50 % of alargest radial cross sectional area of the annular passage (39, 239).
    [6] 6. A fusion welding socket according to any of claims 3-5, wherein the slit defines a smallest opening area which extends circumferentially through the main body (31, 231) between 10° and 80°.
    [7] 7. A fusion welding socket according to any of claims 3-6, wherein the passageway comprises two radially opposingslits arranged through the main body (31, 231) at each ofthe first and second ends (32, 33, 232, 233).
    [8] 8. A fusion welding socket according to any of claims 1-7, wherein the channels comprise a plurality of tubularducts (141-144) arranged through a respective end portion of the intermediate portion 131 of the main body.
    [9] 9. A fusion welding socket according to claim 8, whereinthe channels are inclined in relation to the longitudinal axis of the main body (131).
    [10] 10. A fusion welding socket according to any of claims 1-9, wherein the annular passage (39, 139, 239) is definedby the main body (31, 131, 231) and an outer sleeve (38,138, 238) which surrounds the main body and which extends1ongitudina11y over the intermediate portion (34, 134,234) and at least partia11y over the first and second endportions (32, 132, 33, 133, 232, 233).
    [11] 11. A fusion welding socket according to claim 10,wherein the main body and the outer sleeve are formed as an integra1 part.
    [12] 12. A fusion welding socket according to claim 11,wherein the main body (31, 131, 231) and the outer sleeve (38, 138, 238) are formed of separate components.
    [13] 13. A fusion welding socket according to claim 13,comprising fourth heating coi1s arranged for fusing together the main body with the outer sleeve.
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    同族专利:
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1150170A|SE536025C2|2011-02-25|2011-02-25|Smältsvetsmuff|SE1150170A| SE536025C2|2011-02-25|2011-02-25|Smältsvetsmuff|
    US14/001,397| US8844598B2|2011-02-25|2012-02-14|Fusion welding socket|
    EP12749210.6A| EP2678599B1|2011-02-25|2012-02-14|Fusion welding socket|
    ES12749210.6T| ES2610920T3|2011-02-25|2012-02-14|Fusion welding sleeve|
    PCT/SE2012/050146| WO2012115571A1|2011-02-25|2012-02-14|Fusion welding socket|
    CN2012800105106A| CN103403432A|2011-02-25|2012-02-14|Fusion welding socket|
    BR112013021673-5A| BR112013021673B1|2011-02-25|2012-02-14|fusion weld fitting|
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