Filter membrane bearing device

Abstract

The embodiment of the utility model provides a filter membrane bearing device. The filter membrane bearing device comprises an air inlet bowl, an air outlet bowl, two annular reinforcing rings and a hoop, the middle area of the air inlet bowl is provided with an air inlet hole, and the edge is provided with a first annular edge part; the middle area of the air outlet bowl is provided with an air outlet hole, and the edge is provided with a second annular edge part; the opposite surfaces of the first annular edge part and the second annular edge part are attached to each other, so that the air inlet bowl and the air outlet bowl form a filter membrane accommodating cavity which is communicated with the air inlet hole and the air outlet hole and is used for mounting a filter membrane; step parts are arranged on the peripheral sides of the first annular edge part and the second annular edge part; the two annular reinforcing rings are respectively arranged on the step parts of the air inlet bowl and the air outlet bowl; and the hoop clamps the two annular reinforcing rings and clamps the two annular reinforcing rings, so that the first annular edge part and the second annular edge part are connected in a sealing manner. And by arranging the annular reinforcing ring, the problem that the first annular edge part and the second annular edge part deform due to excessive local stress, and sealing is poor can be solved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of environmental monitoring equipment, and in particular to a filter membrane supporting device. Background Art

[0002] In order to prevent large-sized particles such as dust in the air from entering the air pollutant monitoring instrument, a filter membrane for filtering large-sized particles needs to be installed at the air inlet end of the air pollutant monitoring instrument. In order to protect the filter membrane from being punctured by external force during use, the filter membrane is installed in the filter membrane carrier and supported and protected by the filter membrane carrier.

[0003] Considering the manufacturing and use costs (the machining cost of the filter membrane support device made of alloy material is very high), and at the same time avoiding the release of impurity gases due to the aging of the filter membrane support device itself, which affects the accuracy of pollutant monitoring, the existing filter membrane support devices are mostly made of polytetrafluoroethylene. Although polytetrafluoroethylene has a stable structure and good temperature resistance, its mechanical strength is not high, causing the filter membrane support device made of it to be easily deformed during the assembly process, resulting in low sealing. If the filter membrane support device is set indoors and used to monitor the outdoor environmental quality, indoor air may enter the membrane support through the gap in the membrane support, affecting the monitoring results of outdoor air pollutants. Utility Model Content

[0004] In order to solve the problem of poor sealing effect of the existing filter membrane carrier device, the embodiment of the present disclosure provides a new filter membrane carrier device.

[0005] The disclosed embodiment provides a filter membrane supporting device, including an air inlet bowl, an air outlet bowl, two annular reinforcement rings and a clamp;

[0006] An air inlet hole is arranged in the middle area of ​​the air inlet bowl, and a first annular edge portion is arranged on the edge; an air outlet hole is arranged in the middle area of ​​the air outlet bowl, and a second annular edge portion is arranged on the edge;

[0007] The opposing surfaces of the first annular edge portion and the second annular edge portion are fitted together, so that the air inlet bowl and the air outlet bowl form a filter membrane cavity that communicates with the air inlet hole and the air outlet hole and is used to install the filter membrane;

[0008] The outer circumferential sides of the first annular edge portion and the second annular edge portion are both provided with a step portion;

[0009] The two annular reinforcement rings are respectively installed on the step portions of the air inlet bowl and the air outlet bowl;

[0010] The clamp clamps and tightens the two annular reinforcement rings to achieve a sealed connection between the first annular edge portion and the second annular edge portion.

[0011] Optionally, the longitudinal section of the annular reinforcement ring is wedge-shaped, the inner side surface and the bottom surface are respectively in contact with two step surfaces of the step portion, and the bevel surface is located on the side away from the first annular edge portion and the second annular edge portion;

[0012] The inner side of the clamp is provided with an inner side inclined surface corresponding to the two inclined edge surfaces of the annular reinforcement ring;

[0013] When the clamp clamps the two annular reinforcement rings, the two inner inclined surfaces are respectively close to the corresponding bevel surfaces of the annular reinforcement rings.

[0014] Optionally, an annular protrusion is provided on the mating surface of one of the first annular edge portion and the second annular edge portion, and an annular groove opposite to the annular protrusion is provided on the other one;

[0015] When the clamp clamps the two annular reinforcement rings and tightens them, the annular protrusion is pressed into the annular groove.

[0016] Optionally, a first step portion is provided on the inner side of one of the air inlet bowl or the air outlet bowl, and the other includes an annular protrusion provided on the inner side of the first annular edge portion or the second annular edge;

[0017] When the opposing surfaces of the first annular edge portion and the second annular edge portion are in contact with each other, the annular protrusion abuts against the first step portion.

[0018] Optionally, it also includes a filter membrane support provided with air holes;

[0019] The gas outlet bowl further includes a second step portion; the second step portion is located inside the first step portion or the annular protrusion;

[0020] The filter membrane support is arranged at the second step portion.

[0021] Optionally, the filter membrane cavity includes an air inlet buffer cavity arranged between the air inlet hole and the filter membrane support plate, and / or includes an air outlet buffer cavity arranged between the filter membrane support plate and the air outlet hole.

[0022] Optionally, the air intake bowl includes an air intake pipe connecting portion protruding outward; the air intake hole is arranged on the air intake pipe connecting portion;

[0023] The air outlet bowl comprises an air outlet pipe connecting portion protruding outward; and the air outlet hole is arranged on the air outlet pipe connecting portion.

[0024] Optionally, the air inlet hole and the air outlet hole are both stepped holes, and both include an air pipe mounting hole section for inserting a corresponding air inlet pipe or air outlet pipe, and a limiting hole section for axially limiting the air inlet pipe or air outlet pipe.

[0025] Optionally, the cross-sectional area of ​​the trachea mounting hole section gradually decreases from a side away from the filter membrane cavity to a side close to the filter membrane cavity.

[0026] Optionally, the outer peripheral side of the air inlet pipe connection part and / or the air outlet pipe connection part is provided with an external thread; or,

[0027] From a side away from the first annular edge portion and the second annular edge portion to a side close to the first annular edge portion and the second annular edge portion, a cross-sectional area of ​​the air inlet pipe connecting portion and / or the air outlet pipe connecting portion gradually increases.

[0028] By adopting the scheme of the embodiment of the present disclosure, in the embodiment of the present disclosure, after the annular reinforcement ring is clamped onto the step portion of the first annular edge portion and the second annular edge portion, it can fit well with the first annular edge portion and the second annular edge portion, and will not cause the first annular edge portion and the second annular portion to have problems such as local wrinkles due to uneven force. When the clamp clamps the two annular reinforcement rings and tightens them, the annular reinforcement ring can ensure that the first annular edge portion and the second annular edge portion are fully fitted and sealed. In other words, compared with the existing scheme of directly clamping the first annular edge portion and the second annular edge portion with a clamp, by providing the annular reinforcement ring, the problem of poor sealing caused by excessive local force on the first annular edge portion and the second annular edge portion being deformed can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art description. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor, including

[0031] Figure 1 is an axial schematic diagram of a filter membrane supporting device provided in an embodiment of the present disclosure;

[0032] Figure 2 yes Figure 1 A top view of a filter membrane carrier device provided in an embodiment of the present disclosure;

[0033] Figure 3 yes Figure 2 AA section diagram in;

[0034] Figure 4 It is an axial schematic diagram of an air inlet bowl in a filter membrane supporting device according to some embodiments of the present disclosure.

[0035] Wherein: 100-filter membrane bearing device, 10-air inlet bowl, 11-air inlet hole, 111-air inlet pipe mounting hole section, 112-air inlet pipe limiting hole section, 12-first annular edge portion, 13-first step portion, 14-annular protrusion, 15-annular protrusion, 16-air inlet pipe connecting portion, 20-air outlet bowl, 21-air outlet hole, 211-air outlet pipe mounting hole section, 212-air outlet pipe limiting hole section, 22-second annular edge portion, 23-second step portion, 24-annular groove, 25-third step portion, 26-fourth step portion, 27-air outlet pipe connecting portion, 30-annular reinforcement ring, 40-clamp, 50-filter membrane, 60-filter membrane support plate, 70-air inlet buffer chamber, 80-air outlet buffer chamber. DETAILED DESCRIPTION

[0036] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0037] The term "including" and its variations used in this document are open inclusions, i.e., "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions of other terms will be given in the description below. In this document, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0038] The embodiment of the present disclosure provides a filter membrane supporting device for supporting the filter membrane and achieving better sealing.

[0039] Figure 1 is an axial schematic diagram of a filter membrane supporting device provided in an embodiment of the present disclosure, Figure 2 yes Figure 1 A top view of a filter membrane carrier device provided in an embodiment of the present disclosure, Figure 3 yes Figure 2 AA cross-section diagram in Figure 2. Figure 1-Figure 3 As shown, the filter membrane supporting device 100100 provided in the embodiment of the present disclosure includes an air inlet bowl 10, an air outlet bowl 20, an annular reinforcement ring 30 and a clamp 40 (for ease of understanding, Figure 3 Filter membrane 50 is also shown in FIG.

[0040] The air inlet bowl 10 and the air outlet bowl 20 cooperate to form a filter membrane cavity for accommodating the filter membrane 50. An air inlet hole 11 is provided in the middle area of ​​the air inlet bowl 10, and the air inlet hole 11 is used to introduce external gas into the filter membrane cavity. A first annular edge portion 12 is provided at the edge of the air inlet bowl 10. An air outlet hole 21 is provided in the middle area of ​​the air outlet bowl 20, and the air outlet hole 21 is used to guide the gas filtered by the filter membrane 50 out of the filter membrane cavity. A second annular edge portion 22 is provided at the edge of the air outlet bowl 20.

[0041] When the air inlet bowl 10 and the air outlet bowl 20 are buckled together, the opposing surfaces of the first annular edge portion 12 and the second annular edge portion 22 are in contact, so that the air inlet bowl 10 and the air outlet bowl 20 cooperate to form a filter membrane cavity that connects the air inlet hole 11 and the air outlet hole 21 and installs the filter membrane 50. In practical applications, in order to install the filter membrane 50, a corresponding installation structure should be installed in the air inlet bowl 10 and / or the air outlet bowl 20, which will be analyzed later.

[0042] In the embodiment of the present disclosure, a first step portion 13 is provided on the outer peripheral side of the first annular edge portion 12, and a second step portion 23 is provided on the outer peripheral side of the second annular edge portion 22. Combining the structures of the first annular edge portion 12 and the second annular edge portion 22, it can be known that the first step portion 13 and the second step portion 23 are both annular step portions. The first step portion 13 and the second step portion 23 include a peripheral step surface facing the peripheral side, and an axial step surface having a certain angle with the peripheral step surface.

[0043] There are two annular reinforcement rings 30. The two annular reinforcement rings 30 are respectively arranged on the first step portion 13 and the second step portion 23. The inner side surface of the annular reinforcement ring 30 is in contact with the circumferential step surface, and one bottom surface is in contact with the axial step surface.

[0044] The clamp 40 clamps and tightens the two annular reinforcement rings 30. When the clamp 40 clamps and tightens the two annular reinforcement rings 30, axial pressure is applied to the annular reinforcement rings 30, and the corresponding annular reinforcement rings 30 transfer the axial pressure to the first annular edge portion 12 and the second annular edge portion 22, so that the first annular edge portion 12 and the second annular edge portion 22 are close to each other to achieve sealing.

[0045] In the disclosed embodiment, after the annular reinforcement ring 30 is clamped onto the step portion of the first annular edge portion 12 and the second annular edge portion, it can fit well with the first annular edge portion 12 and the second annular edge portion 22, and will not cause the first annular edge portion 12 and the second annular edge portion 22 to have problems such as local wrinkles due to uneven force. When the clamp 40 clamps the two annular reinforcement rings 30 and tightens them, the two annular reinforcement rings 30 can ensure that the first annular edge portion 12 and the second annular edge portion 22 are fully fitted and sealed. In other words, compared with the existing solution of directly using the clamp 40 to clamp the first annular edge portion 12 and the second annular edge portion 22, by providing the annular reinforcement ring 30, the problem of poor sealing caused by the first annular edge portion 12 and the second annular edge portion 22 being deformed due to excessive force locally can be avoided.

[0046] See also Figure 3 In some embodiments of the present disclosure, the longitudinal section of the annular reinforcement ring 30 is wedge-shaped. In specific implementations, it can be a triangular wedge or a right-angled trapezoidal wedge. Figure 3 The annular reinforcement ring 30 shown is a wedge-shaped ring with a right-angle trapezoidal longitudinal section. As previously analyzed, the inner side and bottom surface of the annular reinforcement ring 30 are respectively in contact with the two step surfaces of the corresponding first step portion 13 and the second step portion 23. When the annular reinforcement ring 30 is installed on the corresponding first annular edge portion 12 and the second annular edge portion 22, its bevel surface faces the side away from the air inlet bowl 10 and the air outlet bowl 20, that is, the side away from the first annular edge portion 12 and the second annular edge portion 22.

[0047] The inner side of the clamp 40 is provided with inner bevel surfaces corresponding to the bevel surfaces of the two annular reinforcement rings 30 respectively. When the clamp 40 clamps the two annular reinforcement rings 30, the two inner bevel surfaces are opposite to the bevel surfaces of the corresponding annular reinforcement rings 30 respectively. Through the aforementioned structure, when the clamp 40 clamps the two annular reinforcement rings 30 and applies a circumferential force to the two annular reinforcement rings 30, the wedge-shaped bevel surface can be used to generate an axial component force, thereby providing a better sealing connection to the first annular edge portion 12 and the second annular edge portion 22. In addition, by providing the aforementioned structure, the processing size redundancy of the clamp 40 and the annular reinforcement ring 30 can be increased, reducing the problem of low sealing effect caused by size mismatch in the prior art.

[0048] In the embodiment of the present disclosure, in order to better achieve the sealing of the first annular edge portion 12 and the second annular edge portion 22, an annular protrusion 14 is provided on the fitting surface of the first annular edge portion 12, and an annular groove 24 is provided on the fitting surface of the second annular edge portion 22. When the clamp 40 clamps the two annular reinforcement rings 30 and clamps them, due to the extrusion effect of the first annular edge portion 12 and the second annular edge portion 22 in the axial direction, the annular protrusion 14 is pressed into the annular groove 24, and cooperates with the annular groove 24 to form a better sealing connection. Of course, in other embodiments, the annular protrusion 14 can also be provided on the fitting surface of the first annular edge portion 12, and the corresponding annular groove 24 is provided on the fitting surface of the second annular edge portion 22.

[0049] Figure 4 1 is an axial schematic diagram of the air inlet bowl 10 in the filter membrane carrier 100 of some embodiments of the present disclosure. Figure 3 and Figure 4 As shown, in some embodiments, the air inlet bowl 10 includes an annular protrusion 15 disposed inside the first annular edge portion 12. Corresponding to the annular protrusion 15 in the first annular edge portion 12, a third step portion 25 is disposed inside the air outlet bowl 20. When the first annular edge portion 12 and the second annular edge portion 22 are in contact with each other, the annular protrusion 15 abuts against the third step portion 25, specifically, the outer peripheral surface of the annular protrusion 15 abuts against the peripheral side surface of the third step portion 25, and the end side surface of the annular protrusion 15 abuts against the axial surface of the third step portion 25. The cooperation between the annular protrusion 14 and the third step portion 25 can play a certain sealing role.

[0050] In some examples of the present disclosure, the edge of the filter membrane 50 can be clamped between the end surface of the annular protrusion 15 and the bottom surface of the third step portion 25 to achieve the installation and edge sealing of the filter membrane 50.

[0051] In other embodiments, the third step portion 25 may also be provided on the inner side of the first annular edge portion 12 of the air inlet bowl 10 , and correspondingly, an annular protrusion 15 needs to be provided on the inner side of the second annular edge portion 22 of the air outlet bowl 20 .

[0052] Please see further Figure 3 In some embodiments of the present disclosure, in order to better support the filter membrane 50 and prevent the filter membrane 50 from being displaced (even flowing out of the air outlet 21) due to the action of air pressure (negative pressure and positive pressure), a filter membrane support 60 is also included. The filter membrane support 60 is provided with air holes for achieving gas circulation. In order to accommodate the installation of the aforementioned filter membrane support 60, a fourth step portion 26 is further provided in the air outlet bowl 20. The fourth step portion 26 is located on the inner side of the third step portion 25 or the annular protrusion 14 ( Figure 3The filter membrane support sheet 60 is arranged at the second step portion 23 and supported by the fourth step portion 26. The filter membrane 50 is placed on the filter membrane support sheet 60 and clamped by the third step portion 25 and the annular protrusion 15 to ensure good sealing and supporting effect.

[0053] In a specific implementation, the air on both sides of the filter membrane 50 achieves filtration of large particle pollutants through pressure difference. If the pressure difference on both sides is too large (that is, the air flow rate is too large), large particles may penetrate the filter membrane 50 due to the excessive pressure difference. In order to avoid the aforementioned problems, the pressure difference on both sides of the filter membrane 50 is appropriately reduced. The filter membrane cavity includes an air inlet buffer cavity 70 arranged between the air inlet hole 11 and the filter membrane support 60, and an air outlet buffer cavity 80 arranged between the filter membrane support 60 and the air outlet hole 21. After the external gas enters the filter membrane cavity through the air inlet hole 11, it first enters the air inlet buffer cavity 70 for deceleration and buffering, and then enters the air outlet buffer cavity 80 through the filter membrane 50, and is accelerated again at the air outlet hole 21 due to the Bernoulli effect.

[0054] As analyzed above, in the disclosed embodiment, the air inlet bowl 10 needs to be connected to the air inlet pipe, and the air outlet bowl 20 needs to be connected to the air outlet pipe. In order to achieve the aforementioned connection. In some embodiments, the air inlet bowl 10 may include an air inlet pipe connecting portion 16 protruding outward, and the air inlet hole 11 is arranged on the air inlet pipe connecting portion 16; the air outlet bowl 20 may include an air outlet pipe connecting portion 27 protruding outward, and the air outlet hole 21 is arranged on the air outlet pipe connecting portion 27. By providing the air inlet pipe connecting portion 16 and the air outlet pipe connecting portion 27 protruding outward, the connection between the air inlet pipe and the air outlet pipe can be facilitated.

[0055] In some examples of the present disclosure, in order to facilitate the installation and positioning of the air inlet pipe and the air outlet pipe, the air inlet hole 11 and the air outlet hole 21 can be set as stepped holes. Specifically, the air inlet hole 11 includes an air inlet pipe installation hole section 111 inserted into the corresponding air inlet pipe, and an air inlet pipe limiting hole section 112 for axially limiting the air inlet pipe; the air outlet hole 21 includes an air outlet pipe installation hole section 211 inserted into the corresponding air outlet pipe, and an air outlet pipe limiting hole section 212 for axially limiting the air outlet pipe.

[0056] In practical applications, the sealing effect at the air inlet 11 and the air outlet 21 is very important for ensuring the sealing of the filter membrane carrier 100. In some embodiments, the air pipe installation hole section 111 can be set to be a cone shape, specifically, the cross-sectional area of ​​the air pipe installation hole section 111 gradually decreases from the side away from the filter membrane cavity to the side close to the filter membrane cavity. In this way, when the size of the air inlet pipe and the air outlet pipe is reasonably set, when the air inlet pipe or the air outlet pipe is inserted into the corresponding air pipe installation hole section 111, as the insertion depth of the air inlet pipe or the air outlet pipe increases, the sealing effect formed between the air inlet pipe and the air outlet pipe and the corresponding connecting part due to the extrusion effect becomes better and better.

[0057] In order to ensure a better sealing effect and prevent the air inlet pipe or the air outlet pipe from falling off the corresponding air inlet pipe connection part 16 or the air outlet pipe connection part 27, in some embodiments, an external thread can be provided on the outer peripheral side of the air inlet pipe connection part 16 and the air outlet pipe connection part 27, and the external thread cooperates with the screws used to lock the air inlet pipe or the air outlet pipe to ensure the sealing between the air inlet hole 11 and the air inlet pipe, and the sealing between the air outlet hole 21 and the air outlet pipe.

[0058] In some other embodiments, in order to ensure a better sealing effect and to prevent the air inlet pipe or the air outlet pipe from falling off the corresponding air inlet pipe connection portion 16 or the air outlet pipe connection portion 27, the air inlet pipe connection portion 16 and the air outlet pipe connection portion 27 are both configured to be conical in shape, and the cross-sectional area of ​​the air inlet pipe connection portion 16 and / or the air outlet pipe connection portion 27 gradually increases from the side away from the first annular edge portion 12 and the second annular edge portion 22 to the side close to the first annular edge portion 12 and the second annular edge portion 22.

[0059] The above are only specific embodiments of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A filter membrane carrying device, characterized in that: It includes an air inlet bowl, an air outlet bowl, two annular reinforcement rings and a clamp; An air inlet hole is arranged in the middle area of ​​the air inlet bowl, and a first annular edge portion is arranged on the edge; an air outlet hole is arranged in the middle area of ​​the air outlet bowl, and a second annular edge portion is arranged on the edge; The opposing surfaces of the first annular edge portion and the second annular edge portion are fitted together, so that the air inlet bowl and the air outlet bowl form a filter membrane cavity that communicates with the air inlet hole and the air outlet hole and is used to install the filter membrane; The outer circumferential sides of the first annular edge portion and the second annular edge portion are both provided with a step portion; The two annular reinforcement rings are respectively installed on the step portions of the air inlet bowl and the air outlet bowl; The clamp clamps and tightens the two annular reinforcement rings to achieve a sealed connection between the first annular edge portion and the second annular edge portion.

2. The filter membrane carrier device according to claim 1, characterized in that: The longitudinal section of the annular reinforcement ring is wedge-shaped, the inner side surface and the bottom surface are respectively in contact with the two step surfaces of the step portion, and the bevel surface is located on the side away from the first annular edge portion and the second annular edge portion; The inner side of the clamp is provided with an inner side inclined surface corresponding to the two inclined edge surfaces of the annular reinforcement ring; When the clamp clamps the two annular reinforcement rings, the two inner inclined surfaces are respectively close to the corresponding bevel surfaces of the annular reinforcement rings.

3. The filter membrane carrier device according to claim 1 or 2, characterized in that: An annular protrusion is provided on the mating surface of one of the first annular edge portion and the second annular edge portion, and an annular groove opposite to the annular protrusion is provided on the other one; When the clamp clamps the two annular reinforcement rings and tightens them, the annular protrusion is pressed into the annular groove.

4. The filter membrane carrier device according to claim 1 or 2, characterized in that: One of the air inlet bowl or the air outlet bowl is provided with a first step portion on its inner side, and the other includes an annular protrusion provided on the inner side of the first annular edge portion or the second annular edge portion; When the opposing surfaces of the first annular edge portion and the second annular edge portion are in contact with each other, the annular protrusion abuts against the first step portion.

5. The filter membrane carrier device according to claim 4, characterized in that: Also included is a filter membrane support sheet provided with air holes; The gas outlet bowl further includes a second step portion; the second step portion is located inside the first step portion or the annular protrusion; The filter membrane support is arranged at the second step portion.

6. The filter membrane carrier device according to claim 5, characterized in that: The filter membrane cavity includes an air inlet buffer cavity arranged between the air inlet hole and the filter membrane support plate, and / or includes an air outlet buffer cavity arranged between the filter membrane support plate and the air outlet hole.

7. The filter membrane supporting device according to claim 1 or 2, characterized in that: The air intake bowl includes an air intake pipe connecting portion protruding outward; the air intake hole is arranged on the air intake pipe connecting portion; The air outlet bowl comprises an air outlet pipe connecting portion protruding outward; and the air outlet hole is arranged on the air outlet pipe connecting portion.

8. The filter membrane supporting device according to claim 7, characterized in that: The air inlet hole and the air outlet hole are both stepped holes, and both include an air pipe mounting hole section for inserting a corresponding air inlet pipe or air outlet pipe, and a limiting hole section for axially limiting the air inlet pipe or air outlet pipe.

9. The filter membrane carrier device according to claim 8, characterized in that: The cross-sectional area of ​​the trachea installation hole section gradually decreases from a side away from the filter membrane cavity to a side close to the filter membrane cavity.

10. The filter membrane supporting device according to claim 7, characterized in that: The outer peripheral side of the air inlet pipe connection part and / or the air outlet pipe connection part is provided with an external thread; or, From a side away from the first annular edge portion and the second annular edge portion to a side close to the first annular edge portion and the second annular edge portion, a cross-sectional area of ​​the air inlet pipe connecting portion and / or the air outlet pipe connecting portion gradually increases.

Images