• 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:
    The filter unit (1), which is intended in particular for use with a suction device in the medical field for filtering a gaseous medium (MG), comprises a filter housing (5) which has a through-tube (51) with a receiving space in which a first filter element ( 11) and has an input part (52) adjoining the through-tube (51) on the input side, to which an input line (54) is connected on the outside facing away from the receiving space, through which the gaseous medium (MG) can be introduced into the receiving space . According to the invention, the first filter element (11) within the receiving space is connected to the through-tube (51) by an adhesive (7) in such a way that the space between the first filter element (11) and the through-tube (51) is sealed and between the inserted first filter element (11) and the input part (52) a diffusion space (500) is kept free.
    公开号:CH717526A2
    申请号:CH00631/21
    申请日:2021-05-31
    公开日:2021-12-15
    发明作者:Maurer Marc；Maurer Marcel；Strauch Patrick
    申请人:Bpr Swiss Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a filter unit for filtering a gaseous medium and a suction device with such a filter unit, in particular for medical purposes.
    Suction devices are used in numerous areas of industry and medicine. A generic suction device is known, for example, from EP3172439B1. During a medical intervention, this suction device can be used to suck off a medium, which usually includes a liquid component and solid particles, through a suction line and transfer it into a container to which a suction line connected to a suction pump is connected. In the container, the extracted medium is divided into a liquid component, possibly mixed with the solid particles, and a gaseous component. The liquid component remains in the container with the solid particles and the gaseous component is fed through the suction line to a filter unit, in which particles that impair room hygiene and are potentially hazardous to health are filtered out.
    It is known from EP3172439B1 that it is particularly important to suck in the medium with high suction power and to drive the gaseous component through the filter unit at the highest possible flow rate. For this purpose, the suction device disclosed there comprises a first suction unit designed as a jet pump, in particular as a Venturi pump or as an ejector pump, and a second suction unit designed as a displacement pump or blower pump. With the two suction units, a correspondingly high negative pressure is generated in the suction line.
    The use of two suction units results in larger dimensions of the suction device. In general, on the other hand, it is desirable for apparatus and devices, particularly in the medical field, to have high performance and nevertheless dimensions that are as slim as possible.
    [0005] Only if a sufficiently large volume of a gaseous component can be driven through the filter unit in a given time will the suction power remain high. In order to strive for this, it would be possible to use connecting lines with the largest possible cross-section, which, for example, have the cross-section of the filter. However, this is normally not possible because the dimensions of the lines that carry the gaseous component are limited due to restricted space and given industry standards.
    A filter unit is known from US2010044299A1, which is used to filter liquids, in particular blood, and which has a housing with an input part and an output part, between which a plurality of plate-shaped filter elements can be clamped. If several filters are used one on top of the other, they are separated from one another by spacer rings so that the filters remain aligned parallel to one another and overstretching and the resulting cracks in the filter plates are avoided.
    Another filter unit is known from US4159954A, which is used to filter liquids and which has a housing with an input part and an output part, between which a plate-shaped filter element is held. To distribute the liquid, the inlet part is provided with ribs through which the liquid is distributed. This is to prevent the filter plate from being torn open by the incompressible liquid flowing in.
    In the case of compressible gaseous media, however, these problems do not occur. In the case of filter units which are provided for filtering a gaseous medium, an insufficiently high throughput of the gaseous medium and an unsatisfactory separation of undesired media components are often criticized. In particular, after a relatively short period of operation, a performance drop in the filter unit is often observed, which requires the filter unit to be replaced relatively early, which causes a corresponding maintenance effort and correspondingly high costs, since high-quality filters are relatively expensive in view of the high manufacturing effort.
    [0009] Filter units also often cause annoying noises during operation, which are particularly undesirable in medical treatment rooms.
    The present invention is therefore based on the object of creating an improved filter unit for filtering a gaseous medium and an improved suction device with such a filter unit for filtering a gaseous medium, which can advantageously be used in the medical field.
    The filter unit should allow the smallest possible dimensions and, for a given suction capacity of the suction device, a higher flow rate of the gaseous medium and improved separation of unwanted media components, such as solids and liquid components.
    [0012] Improved filter elements, which have an increased service life and improved operating performance, should be able to be manufactured at low cost.
    The suction device and the filter unit should be able to be operated with reduced maintenance effort and, if possible, with reduced power.
    The suction device, which can be equipped with one or two suction units, should have an increased suction effect.
    [0015] An increased suction power and/or an increased flow of the gaseous component should be able to be achieved without increasing the dimensions of the filter unit and the gas-carrying lines.
    [0016] Furthermore, during the operation of the filter unit and the suction device, disturbing noises are to be reduced, so that the filter unit and the suction device can also be used under demanding working conditions.
    [0017] This object is achieved with a filter unit and a suction device which have the features specified in claim 1 and claim 14. Advantageous configurations of the invention are specified in further claims.
    The filter unit, which is intended in particular for use with a suction device in the medical field for filtering a gaseous medium, comprises a filter housing which has a through-tube with a receiving space in which a first filter element is held, and a through-tube on the input side subsequent input part, to which an input line is connected on the outside facing away from the receiving space, through which the gaseous medium can be introduced into the receiving space.
    According to the invention it is provided that the first filter element within the receiving space is connected to the through-tube by an adhesive in such a way that the space between the first filter element and the through-tube and between the inserted first filter element and the input part of the housing or the housing base is sealed a diffusion space is kept free.
    The adhesive has a dual function. On the one hand, the filter element is kept at a suitable height so that a defined diffusion space is kept free. On the other hand, the space between the filter element and the wall of the through pipe is sealed, so that the gaseous medium is forced to pass through the sealing element.
    The dimensions of the diffusion space are selected in such a way that the gaseous medium flowing into or conveyed into the filter housing through the inlet line is preferably distributed over the entire cross section of the filter element within the diffusion space and can flow through it, which is associated with various advantages.
    The diffusion space preferably has at least approximately the same cross section as the receiving space or the filter element used in the filter unit. On the other hand, the diffusion space can only have a minimum height or length, with which it is ensured that the diffusion of the inflowing medium, in particular contaminated air, can take place unhindered. The diffusion space can therefore be realized without a noticeable enlargement of the filter housing resulting.
    The filter element preferably has a round, rectangular, square or polygonal cross section. The configuration of the filter element with a polygonal cross section has the advantage that space is kept free between the sides of the multi-edged filter element and the inside of the through-tube, which serves to accommodate the adhesive.
    The filter unit according to the invention can be realized with small dimensions. Improved suction power and increased flow can be achieved without increasing the cross-section of the gas-carrying lines. On the other hand, with the solution according to the invention, practically the same effect is achieved as when using connection lines with a cross section which corresponds approximately to the cross section of the filter element.
    Advantageously, the input part or the housing base can be flat, so that the input part of the filter unit takes up practically no space and no flow losses result.
    Due to the realization of a diffusion space, the gaseous medium flows through the filter element at least approximately evenly over the entire cross section and over the entire length. In this way, the filter element can develop an optimal benefit. The inlet aperture of the filter element is maximum, which is why the flow resistance caused by the filter element is reduced to a minimum. A desired flow can therefore be achieved with reduced power.
    Due to the opening of the aperture, the filter element is not only used over the entire cross section on the input side, but is also loaded over the entire cross section, which results in a reduction in the load per unit volume of the filter element. Particles filtered out are not concentrated on a fraction of the cross section of the filter element on the inlet side, but are deposited evenly over the entire cross section of the filter element. Correspondingly, significantly reduced loads result in the inlet area through which the medium flows. This prevents the filter element from being loaded unequally over the entire length and the input area of the filter element from being overloaded early during operation with filtered out particles, which saturate the filter zone through which flow occurs and form additional flow resistance. With the solution according to the invention, the input area of the filter element is not more heavily loaded than the other filter areas. It is therefore avoided that the filter element has to be replaced because a certain zone is more heavily loaded and saturated earlier. It is only necessary to replace the filter element when it has reached a maximum permissible load evenly over the entire volume.
    In preferred configurations, at least one spacer element is provided, which ensures that the filter element cannot enter the diffusion space and reduce its volume during assembly and/or later during operation of the filter unit.
    The at least one spacer element is preferably shoulder-shaped and/or ring-shaped or spiral-shaped. In a further preferred embodiment, several rib-shaped spacer elements are provided.
    In the case of the shoulder-shaped and/or ring-shaped and self-contained design of the spacer element, this preferably adjoins the filter element in such a way that the gap between the filter element and the inner wall of the through-tube is closed and adhesive cannot enter the diffusion space.
    The height at which the spacer element or the spacer elements protrude into the receiving space is preferably in the range of 1 mm - 10 mm. The height at which the spacer element or the spacer elements protrude into the receiving space and the strength of the filter element are preferably matched to one another, so that the diffusion space is not filled by the filter element even if it is deformed or swollen, and the diffusion of the inflowing medium is prevented can take place unhindered on the entire cross section of the filter element.
    The width of the spacer element or the spacer elements is preferably selected to be smaller by a factor in the range of 0.5-10 than the height of the spacer element or the spacer elements.
    The spacer element or the spacer elements are preferably arranged concentrically to the longitudinal axis of the filter unit or to the longitudinal axis of the filter element used, so that this is evenly supported. The input line is preferably arranged coaxially to the longitudinal axis of the filter element used, at least in the connection area.
    [0034] If rib-shaped spacer elements are provided, they preferably run at equal distances from one another. The rib-shaped spacer elements are preferably arranged radially or inclined to a radial orientation.
    The spacer elements are preferably integrally formed on the housing base or on the input part. The input part or the entire filter housing can thus be molded in one piece from plastic.
    In order to further optimize the free diffusion of the medium in the diffusion space, the spacer element or the spacer elements are preferably provided with breakthroughs or openings. The gaseous medium can easily pass through the openings and openings while the filter element is still held stably.
    The through-tube preferably has a polygonal or circular cross-section. Preferably, the filter element closes tightly to the side wall or side walls of the through-tube, so that the medium passes through the filter unit over a maximum cross-section within the filter element and only a small amount of adhesive compound or sealant is required to seal the space between the filter element and the inside of the through-tube.
    [0038] On the outlet side, the filter housing is preferably connected to an outlet part which adjoins the through-tube, is designed in the shape of a ring or in the shape of a cover and has at least one outlet opening. The output part is fixed, integral or, if necessary, detachably connected to the through-tube by threaded elements or locking elements.
    The filter element is preferably manufactured by multiple folding of a strip-shaped filter material or filter laminate. For this purpose, a preferably rectangular filter strip is folded several times, so that several filter plates, preferably of the same size, result. Folding a rectangular filter strip results in a cuboid or cube-shaped filter element.
    The filter element is preferably formed in a serpentine shape, the filter plates, which are each folded in pairs about a folding axis, being aligned at least approximately parallel to one another and spaced apart from one another. In this way, the filter element has a correspondingly large entry area and a correspondingly large exit area, so that the gaseous medium can be distributed over a large area and the filter element is only minimally loaded per unit area. A saturation of the filter element therefore occurs at a much later point in time, even with an increased volume flow of the medium. Corresponding to the factor of the pleating, a higher volume of the gaseous medium can therefore be passed through the filter unit before the filter element becomes saturated or exhausted.
    In a preferred embodiment, the filter plates are inclined or arranged perpendicular to the longitudinal axis of the filter unit, so that the filter plates are passed through sequentially and a high degree of purity of the filtered medium is achieved.
    [0042] In contrast, the filter plates are preferably aligned parallel to the longitudinal axis, so that the gaseous medium only passes through one filter plate. It is preferably provided that the filter plates are aligned parallel and the fold axes perpendicular to the longitudinal axis of the filter unit. The cube-shaped or cuboid filter element is preferably inserted into the through-tube with a longitudinal axis coaxial to the longitudinal axis of the filter unit.
    So that the filter element remains in the desired shape, optionally a serpentine shape, at least one fastening element is preferably provided. The filter element is preferably provided with a fastening element on both sides, which laterally delimits the intermediate spaces between the filter plates. The gaseous medium introduced into an intermediate space can therefore not escape laterally between the filter plates, but is forced to pass through a filter plate.
    The fastening elements are preferably adhesive connections which connect the filter plates to one another peripherally and close off the intermediate spaces at the side. A fastening element preferably forms a wall element which laterally delimits the filter element.
    In preferred configurations, the first filter element is adjoined by at least one second filter element, which is preferably held in the cover-shaped outlet part and on the one hand preferably adjoins the first filter element and on the other hand preferably adjoins the at least one outlet opening in the outlet element. The second filter element fulfills a filter function and/or a soundproofing function.
    The second, preferably porous filter element can reduce the sound energy, especially of sound in high frequency ranges, and deliver it to the output openings of the cover-shaped output part. In the second filter element, sound energy is converted into thermal energy. In addition, the gaseous medium within the second filter element is supplied to the outlet opening or outlet openings in a uniformly distributed manner, as a result of which increased volume flows at certain points, which cause whistling or noise, are avoided.
    A cover-shaped outlet part is preferably provided, on which outlet openings are provided frontally and/or laterally. The lateral arrangement of the outlet openings also leads to a significant noise reduction. In particular, the deflection reduces sound components in the higher frequency ranges. A plurality of exit openings are preferably arranged in a circle at equal intervals.
    An optimal noise reduction results when using the second filter element and an outlet part with lateral outlet openings.
    If the first filter element is guided into the second outlet part and is connected to the outlet opening or the outlet openings, a noise reduction is also achieved.
    The filter unit according to the invention can advantageously be connected to suction devices by means of which liquid and/or solid particles are sucked off during medical or dental interventions.
    Suction devices of this type preferably comprise a reservoir connected on the one hand to a suction duct operated by the user and on the other hand to a suction duct connected to the filter unit via a suction unit or pump. In the container, the medium is divided into a liquid component and a gaseous component. The liquid component remains in the container and the gaseous component is conveyed on to the filter unit. Residual particles are removed from the gas flow in the filter unit so that cleaned air escapes from the filter unit, which no longer endangers room hygiene.
    The invention is explained in more detail below with reference to drawings. 1 shows a suction device according to the invention with a container 3, on the one hand with a suction line 31, through which a medium M can be sucked in, which is divided into a liquid component MF and a gaseous component MG in the container 3, and on the other hand connected to a suction pipe 32 connected to a suction unit 2 which supplies the gaseous component MG to a filter unit 1; Fig. 2a shows the filter unit 1 of Fig. 1 in a preferred embodiment with a filter housing 5 shown in a longitudinal section, which comprises a through-tube 51, which is connected on the outlet side to an annular outlet part 53 and on the inlet side to an inlet part 52, and which has a receiving space 50 encloses, in which a filter element 11 is connected to the inside of the through-tube 51 by an adhesive 7 in such a way that the space between the first filter element 11 and the through-tube 51 is sealed and a diffusion space 500 is kept free between the filter element 11 and the inlet part 52; Fig. 2b shows the filter unit 1 of Fig. 2a after removal of the filter element with the inlet part 52 in the configuration of a flat housing base, to which an inlet line 54 is connected and which has an annular spacer element 521 protruding into the receiving space 50 of the housing 5 a diffusion space 500 is kept free between an inserted filter element 11 and the housing bottom 52; FIG. 2c shows the filter unit 1 of FIG. 2a without the output part 53; 3 shows the filter unit 1 of FIG. 2a seen from the inlet side with the housing bottom 52 partially cut away and with the annular spacer element 521 and the at least approximately cylindrical adhesive layer 7 by means of which the filter element 11 is held; FIG. 4 shows the filter unit 1 of FIG. 3 with eight rib-shaped spacer elements 521, which are arranged concentrically and radially to the inlet line 54 or to the inlet opening 520 on the inlet part 52; 5a shows an exploded view of a filter unit 1 according to the invention, which is optionally provided with a second filter element 12, in a preferred embodiment; FIG. 5b shows the assembled filter unit 1 of FIG. 5a with a quarter section; and FIG. 6 shows a preferably configured and preferably aligned filter element 11 for the filter units 1.
    1 shows a suction device according to the invention with a container 3 which is connected on the one hand to a suction line 31 operated by the user and on the other hand to a suction line 32 which is connected to a suction unit 2 connected to a filter unit 1. The suction unit 2 generates a negative pressure in the container 3 via the suction line 32 , which in turn generates a suction effect or a flow of media in the suction line 31 .
    The suction line 31 is connected at the end, e.g. to a cannula, by means of which liquid and solid particles can be suctioned out of an operating field, e. The extracted medium M is separated in the container 3 into a liquid component MF and a gaseous component MG. The suction line 31 and the suction line 32 are connected to a cover 30 of the container 3, which has a separating element 4, which serves as an additional barrier for the liquid component MF.
    The liquid component MF remains in the container 3 and the gaseous component MG is guided through the suction line 32, the suction unit 2 and an input line 54 to a filter unit 1 according to the invention.
    Particles remaining in the gaseous component MG, which could impair room hygiene and the health of the people present, are caught in the filter unit 1, so that a media flow ML exits from the filter unit 1, which does not impair room hygiene.
    Fig. 1 shows the filter unit 1 in a schematic configuration with a filter housing 5, which comprises a through-tube 51, which is connected to an outlet part 53 on the outlet side and to an inlet part 52 on the inlet side, and which encloses a receiving space 50 in which a filter element 11 is connected to the inside of the through-tube 51 by an adhesive 7 in such a way that the space between the first filter element 11 and the through-tube 51 is sealed and a diffusion space 500 is kept free between the filter element 11 and the inlet part 52 .
    It can be seen that spacer elements 521 are provided between the housing base 52 and the input side of the filter element 11, which prevent the filter element 11 inserted into the through-tube 51 from entering the diffusion space 500 during assembly.
    The gaseous medium MG, which flows into the diffusion space 500 through an inlet line, can be distributed over the entire cross section of the filter element 11 . The diffusion space 500 is disproportionately large and basically only requires a size that allows the even distribution of the inflowing gaseous medium MG. The diffusion space 500 thus has a cross section which corresponds at least approximately to the cross section of the receiving space 50 or the cross section of the filter element 11, the height or length of which can be reduced to a minimum as far as the homogeneous diffusion of the inflowing medium MG over the entire cross section of the filter element 11 is guaranteed.
    The arrows symbolically show that the gaseous medium MG is distributed uniformly over the entire cross section of the filter element 11 and enters it. The inlet side of the filter element 11 is thus uniformly charged with the gaseous medium MG, which flows evenly through the filter element 11 from the inlet side to the outlet side over the entire cross section.
    Fig. 2a shows the preferably configured filter unit 1 of Fig. 1 with a longitudinal section through the filter housing 5. The through-tube 51 of the filter housing 5 is cylindrical and has a relatively thin cylinder wall 511, which on the inlet side is integral with the inlet part or the housing base 52 is connected. The inlet line 54 , via which the medium MG to be filtered can be introduced into the filter unit 1 , is connected to the inlet part 52 on the inlet side, preferably aligned coaxially to the longitudinal axis of the filter unit 1 . Alternatively, you can
    The through-tube 52 encloses the receiving space 50 in which the filter element 11 is held by an annular adhesive layer 7 . The filter element 11 rests against the cylinder wall 511 and is connected to the inner wall of the through-tube 52 by the adhesive layer 7 , which is why the supplied medium runs through the filter unit 1 exclusively within the filter element 11 .
    The input part 52 is connected to a spacer element 521 which protrudes into the receiving space 50 and keeps the diffusion space 50 free as part of the receiving space 50 . The filter element 11 is normally in contact with the spacer element 521 and is held by the adhesive layer 7, which is why the diffusion space 500 is kept open between the housing base 52 and the inlet side of the filter element 11. The spacer element 521 is therefore a gauge that allows the filter element 11 to be positioned correctly.
    The spacer element 521 is preferably designed in height and/or width and/or orientation and/or number and/or shape such that the filter element 11 does not expand to the housing bottom 52 even after prolonged operation of the filter unit 1 and the Diffusion space 500 can completely or partially close. Furthermore, the at least one spacer element 521 is so narrow that only a negligibly small part of the inlet-side cross-sectional area of the filter element is covered. The at least one spacer element 521 is therefore preferably selected to be as large as necessary and as small as possible.
    Since the filter element 11 is held by adhesive 7 after assembly, the spacer element 521 no longer fulfills any relevant load-bearing functions after the adhesive 7 has solidified, but it prevents an undesired expansion of the filter element into the diffusion space 500.
    2a also shows that an annular output part 53 is placed on the through-tube 51 on the output side, which forms a holding flange which holds the filter element 11 in position. The annular outlet part 53 encloses an annular opening 530 through which the filtered gaseous medium, for example air, can exit. The annular output part 53 is preferably releasably held by threaded elements or locking elements which interact with threaded elements or locking elements on the housing wall 511 . The annular starting part 53 can therefore be removed in order to replace the filter element 11 .
    In the same way, a cover-shaped outlet part 53 can be connected to the through-tube 51 on the outlet side (see FIG. 5b).
    2b shows the filter unit 1 of FIG. 2a after the filter element 11 has been removed. It can be seen that the spacer element 521 is ring-shaped and concentrically encloses the inlet opening 520, into which the inlet line 54 opens, in the inlet part 52. It is shown symbolically that the spacer element 521 can have openings or openings 5210 through which the supplied medium can pass to the outside.
    2c shows the filter unit 1 of FIG. 2a without the annular outlet part 53.
    Fig. 3 shows the filter unit 1 of Fig. 2a seen from the inlet side with the inlet part 52 partially cut away and with the annular spacer element 521, which is arranged concentrically to the inlet opening 520 on the inlet part 52, preferably formed. Eight arrows symbolize that the medium flowing in can be distributed evenly. It is also shown that the space between the filter element 11 and the inner wall of the through-tube 51 is sealed off by an annular adhesive layer 7 .
    FIG. 4 shows the filter unit 1 from FIG. 3 in an embodiment in which the ring-shaped spacer element 521 from FIG. 3 has been replaced by eight spacer elements 521 in the form of ribs. The spacer elements 521 are arranged at equal intervals concentrically and radially to the input line 54 or to the input opening 520 of the housing base 52 . The inflowing medium can spread unhindered between the rib-shaped spacer elements 521 up to the housing wall 511 over the entire cross section of the filter element 11 used and can then flow through it. Openings between the filter element 11 and the wall 511 of the passage tube 51 are closed by the adhesive 7 . A filter element 11 is preferably used, the cross section of which is somewhat larger than the cross section of the receiving space 50 . The filter element 11 is therefore slightly compressed and pushed into the filter housing 5 . The filter housing 5 can also have a different cross section in order to be able to accommodate further filter elements 11 .
    5a shows a filter unit 1 according to the invention in a preferred embodiment in an exploded view.
    A plate-shaped input part 52 adjoins the underside of the hollow-cylindrical through-tube 51 and forms an annular shoulder on the periphery, which serves as a spacer element 521 . The filter element 11 is dimensioned in such a way that it can be placed on the annular shoulder 521 and cannot enter the diffusion space 500 . The filter element 11 is shown with the annular layer of adhesive 7 partially covering the filter element 11 . However, the adhesive layer 7 can generally also extend over the entire height of the filter element 11, so that the space between the filter element 11 and the through-tube 51 is completely sealed off at the side.
    The filter element 11 is designed in the form of a cube or cuboid, so that it can be manufactured in a simple manner in a preferred embodiment, for example according to FIG.
    In this preferred embodiment, a second filter element 12, which has a filter function and/or a soundproofing function, is optionally placed on the first filter element 11.
    The preferably porous second filter element 12 reduces sound vibrations, particularly in higher frequency ranges. Furthermore, the filtered air is discharged in an evenly distributed manner to the outlet openings 530 of the outlet part 53 in the form of a cover. The outlet part 53 has a cylindrical side wall on which the outlet openings 530 are evenly distributed. The second filter element 12 can therefore be partially or completely accommodated by the output part 53 . The use of the second filter element 12 thus prevents a larger air flow from causing whistling or noise at the edges of the outlet opening 530 .
    Figure 5b shows the assembled filter unit 1 of figure 5a with a quarter section. The diffusion space 500 is kept free between the inlet part 52 and the underside of the first filter element 11 . The first filter element 11 is tightly connected to the inside of the through-tube 51 by the annular adhesive layer 7 . An intermediate space is kept free between the first filter element 11 and the second filter element 12, in which at least one further filter element could be inserted. In preferred configurations, however, the two filter elements 11, 12 are in contact with one another. It is also shown that the gaseous medium MG enters the diffusion space 500 in the filter unit 1 through the inlet line 54 and exits the filter unit 1 again laterally through the outlet openings 530 .
    FIG. 6 shows a preferably designed and preferably aligned filter element 11 which is surrounded by an adhesive ring 7 . The filter element 11 is made from a strip-shaped filter material or filter laminate, which has been folded several times in such a way that several filter plates 111 of approximately the same size result. The filter plates 111, which run in a serpentine manner and are connected to one another, are folded in pairs about an associated folding axis f, are aligned parallel to one another and are spaced apart from one another in pairs. The folding of the strip-shaped filter material increases the entry area and the exit area of the filter element 11 by a factor of more than 10. The entry surface of the filter element 11 thus corresponds to the surface of the folded filter material and not to the cross section of the filter element 11.
    The separators are held in place by fasteners 110. FIG. If the adhesive ring 7 does not completely cover the filter element 11 laterally, it is necessary to close the spaces between the separating plates 111 laterally. Fastening elements 110 are therefore preferably implemented as adhesive layers or adhesive walls, which seal filter element 11 tightly on both sides, so that gaseous medium MG can only pass through filter element 11 from the inlet to the outlet of filter unit 1 . The gaseous medium MG can therefore enter the interspaces between the filter plates 111, but not laterally, but only through the filter plates 111 to the outlet of the filter unit 1. Preferably, the filter element 11 is inserted into the through-tube 51 of FIG. 5b as shown in FIG. The filter plates 111 are aligned parallel and the folding axes f are aligned perpendicular to the longitudinal axis x of the filter unit 1
    On the other hand, it is also possible to align the filter plates 111 perpendicular to the longitudinal axis x of the filter unit 1, so that the gaseous medium passes through the filter plates 111 sequentially. In this configuration, a strip-shaped filter material can also be used, which preferably has different filter properties in accordance with the size of the filter plates 111 . For example, provision can be made for the first separating plate 111 to be hydrophobic and to bring about a reliable separation of liquid as early as at the inlet of the filter element 11 .
    权利要求:
    Claims (15)
    [1]
    1. Filter unit (1) for a suction device, by means of which a gaseous medium (MG) is filtered, with a filter housing (5) which has a through-tube (51) with a receiving space (50) in which a first filter element (11) is held and has an inlet part (52) adjoining the through-tube (51) on the inlet side, to which an inlet line (54) is connected or can be connected on the outside facing away from the receiving space (50), through which the gaseous medium (MG) enters the receiving space (50) can be inserted, characterized in that the first filter element (11) is connected within the receiving space (50) by an adhesive (7) to the through-tube (51) in such a way that the space between the first filter element (11) and the inside of the through-tube (51) is sealed and a diffusion space (500) is kept free between the inserted first filter element (11) and the inlet part (52).
    [2]
    2. Filter unit (1) according to claim 1, characterized in that at least one spacer element (521) protruding into the receiving space (50) is arranged on the inside of the input part (52) facing the receiving space (50) or is formed on the input part (52). , which prevents the first filter element (11) from entering the diffusion space (500) during assembly or during operation.
    [3]
    3. Filter unit (1) according to claim 2, characterized in that the at least one spacer element (521) is ring-shaped, shoulder-shaped or spiral-shaped and preferably arranged concentrically to the longitudinal axis of the filter unit (1) or that the at least one spacer element (521) is radial or is arranged inclined to the longitudinal axis of the filter unit (1).
    [4]
    4. Filter unit (1) according to any one of claims 1-3, characterized in that the first filter element (11) is cylindrical, cuboid or cube-shaped or that the first filter element (11) is cylindrical, cuboid or cube-shaped and in this way on the annular or shoulder-shaped and self-contained spacer element (521) that the adhesive (7) cannot penetrate into the diffusion space (500).
    [5]
    5. Filter unit (1) according to any one of claims 1-4, characterized in that the preferably circular or polygonal cross-section or cross-section of the through-tube (51) is adapted to the cross-section or cross-section of the filter element (11) and that the first filter element (11) is held by the adhesive (7) completely or partially at a distance from the through-tube (51) or adjacent to the through-tube (51).
    [6]
    6. Filter unit (1) according to any one of claims 1-5, characterized in that the preferably cuboid or cube-shaped first filter element (11) comprises a strip-shaped filter material or filter laminate which is folded into several preferably equally large filter plates (111).
    [7]
    7. Filter unit (1) according to claim 6, characterized in that the first filter element (11) runs in a serpentine shape and that the filter plates (111), which are folded in pairs about a folding axis (f), are aligned at least approximately parallel to one another and are spaced apart from one another .
    [8]
    8. Filter unit (1) according to claim 6 or 7, characterized in that the filter plates (111) are aligned perpendicular to the longitudinal axis (x) of the filter unit (1) or that the filter plates (111) are parallel and the folding axes (f) perpendicular to the longitudinal axis (x) of the filter unit (1) are aligned.
    [9]
    9. Filter unit (1) according to claim 6, 7 or 8, characterized in that the filter plates (111) are held on both sides by means of at least one fastening element (110).
    [10]
    The filter unit (1) according to claim 9, characterized in that the fasteners (110) are adhesive joints peripherally connecting the filter plates (111) to one another or that the fastening elements (110) are adhesive joints peripherally connecting the filter plates (111) to one another and close off the intermediate spaces provided between the filter plates (111) on both sides.
    [11]
    11. Filter unit (1) according to any one of claims 1-10, characterized in that at least one second filter element (12) is connected to the first filter element (11).
    [12]
    12. Filter unit (1) according to one of Claims 1-11, characterized in that the filter housing (5) has an outlet part (53) adjoining the through-tube (51) on the outlet side, which is annular or cover-shaped and has at least one outlet opening (530 ) and that the output part (53) is detachably connected to the through-tube (51) in one piece, positively or non-positively, if necessary by threaded elements or locking elements.
    [13]
    13. The filter unit (1) according to claim 12, characterized in that the outlet part (53) is in the form of a cover and has one or more outlet openings (530) on the side or front, or in that the outlet part (53) is in the shape of a cover and has one or more on the side or front has a plurality of outlet openings (530) and completely or partially encloses an end piece of the first filter element (11) or the second filter element (12).
    [14]
    14. Suction device for sucking off liquid and/or solid particles, in particular for medical applications, with a filter unit (1) according to one of claims 1-13 connected to a suction unit (2).
    [15]
    15. Suction device according to claim 14, characterized in that a container (3) is provided which, on the one hand, is provided with a suction line (31) through which a medium (M) which in the container (3) has broken down into a liquid component (MF ) and is divided into a gaseous component (MG), and on the other hand is connected to an intake line (32) which is connected via a suction unit (2) to the filter unit (1) to which the gaseous component (MG) can be supplied.
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    同族专利:
    公开号 | 公开日
    CH717515A2|2021-12-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CH00698/20A|CH717515A2|2020-06-11|2020-06-11|Filter unit for a suction device and suction device.|
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