Filtering device

Abstract

According to the filtering device provided by the utility model, as long as the first pipeline and the second pipeline of the multi-way pipeline are directly communicated with the first pipeline and the second pipeline of the pipeline system respectively, the multi-way pipeline can be used for replacing a pipeline joint for connecting the first pipeline and the second pipeline, and then the filtering part is arranged through the maintenance port; according to the multi-way pipeline filtering device, one part of the filtering component is contained and positioned in the third pipeline of the multi-way pipeline, the other part of the filtering component extends into the first pipeline connected with the first pipeline, and the filtering component does not need to be completely arranged in the multi-way pipeline, so that the structure of the filtering device is simplified, and the overall size of the filtering device is reduced; therefore, positioning and installation of the filtering part can be conveniently achieved without reserving a large installation space in a pipeline system. Moreover, when the filtering part needs to be maintained or replaced, the filtering part can be quickly taken out through the maintenance opening only by detaching the sealing assembly from the maintenance opening of the third pipeline, and the filtering part is convenient to maintain, clean or replace.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipeline filtration, and particularly relates to a filtration device. Background Art

[0002] In the fields of petroleum, chemical industry, medicine, food, environmental protection, new energy, etc., filters are an indispensable filtration device on pipelines for transporting fluid media. Currently, filtration devices such as Y-type filters, T-type filters, and precision filters are generally directly installed as a whole, which includes a filtration component, inside the pipeline. Due to the complex structure and usually large size of the filtration device, not only a large space needs to be reserved inside the pipeline to successfully position and install the filtration device, but it is also difficult to achieve the convenient installation of the filtration device or filtration component, and it is not convenient for the later maintenance or replacement of the filtration component. Summary of the Utility Model

[0003] Based on the above problems existing in the prior art, the purpose of the embodiments of the present utility model is to provide a filtration device to solve the problems in the prior art that the filtration device has a complex structure and large size, not only requires a large installation space inside the pipeline, but also is difficult to achieve the convenient installation of the filtration component, and is not convenient for the maintenance or replacement of the filtration component.

[0004] To achieve the above purpose, the technical solution adopted by the present utility model is: to provide a filtration device, including

[0005] a filtration component for filtering impurities in pipeline fluid;

[0006] a multi-way pipeline, including a first pipeline for connecting with a first pipeline, at least one second pipeline for connecting with a second pipeline, and a third pipeline for accommodating and positioning the filtration component. One end of the first pipeline is connected to one end of the third pipeline, the other end of the third pipeline has a maintenance port for the filtration component to be placed into the third pipeline, and one end of the second pipeline is connected to the side of the third pipeline; and

[0007] a closing component for opening or closing the maintenance port, and the closing component is detachably installed at one end of the third pipeline having the maintenance port;

[0008] wherein, a part of the filtration component is accommodated and positioned in the third pipeline, and the other part of the filtration component can extend into the first pipeline connected to the first pipeline.

[0009] Further, the closing assembly includes a cover body covering the maintenance opening, a first sealing member disposed at the connection between the cover body and the third pipeline, and a second sealing member disposed at the connection between the filtering member and the third pipeline. The cover body is detachably mounted at one end of the third pipeline having the maintenance opening.

[0010] Further, one end of the third pipeline having the maintenance opening is provided with a flange, and the cover body is connected to the flange through a fastener.

[0011] Further, the multi-way pipeline is a three-way pipeline, and the number of the second pipelines is 1.

[0012] Further, the filtering member includes a support body for accommodating and positioning in the third pipeline and a filtering body disposed on the support body. The filtering body extends into the first pipeline connected to the first pipeline.

[0013] Further, the filtering body includes a tower-shaped skeleton or a conical skeleton connected to the support body, and a filter screen disposed on the tower-shaped skeleton or the conical skeleton.

[0014] Further, the conical angle β of the tower-shaped skeleton or the conical skeleton is 3° to 20°, and the length L of the tower-shaped skeleton or the conical skeleton is 2 to 8 times the diameter of the cross-section of the first pipeline.

[0015] Further, the filtering area of the filter screen is 10 to 15 times the diameter of the cross-section of the first pipeline.

[0016] Further, the support body has a columnar frame structure. Axial ends of the support body respectively have a first end face and a second end face, and a limiting step for cooperatively abutting against the first end face is provided in the third pipeline.

[0017] Further, one end of the third pipeline having the maintenance opening is provided with a flange. The closing assembly includes a flange blind plate covering the maintenance opening and adapted to the flange, a first sealing member disposed between the flange blind plate and the flange, a second sealing member disposed between the first end face and the limiting step, and a fastener for fastening the flange blind plate to the flange. When the fastener fastens the flange blind plate to the flange, the flange blind plate can squeeze the first sealing member under the pre-tightening force of the fastener, and the flange blind plate can push the support body under the pre-tightening force of the fastener so that the support body squeezes the second sealing member.

[0018] Further, the central axis of the first pipeline is parallel to or coincides with the central axis of the third pipeline, and the included angle between the central axis of the second pipeline and the central axis of the third pipeline is an acute angle, a right angle or an obtuse angle.

[0019] One or more of the above technical solutions in the embodiments of the present utility model, compared with the prior art, have at least one of the following beneficial effects:

[0020] For the filtering device in the embodiment of the present utility model, only the first pipe of the multi-way pipe and at least one second pipe need to be directly connected to the first pipeline and the second pipeline of the pipeline system respectively, then the multi-way pipe can be used to replace the pipe joint connecting the first pipeline and the second pipeline, and then the filtering component is placed into the multi-way pipe through the maintenance port, so that a part of the filtering component is accommodated and positioned in the third pipe of the multi-way pipe, and the other part extends into the first pipeline connected to the first pipe. Since the filtering component does not need to be completely placed in the multi-way pipe, it is beneficial to streamline the structure of the filtering device and reduce the overall size of the filtering device. Therefore, there is no need to reserve a large installation space in the pipeline system, and the positioning installation of the filtering component can be conveniently realized. Moreover, when the filtering component needs to be maintained or replaced, only the sealing component needs to be removed from the maintenance port of the third pipe, and then the filtering component can be quickly taken out through the maintenance port, which is convenient for the maintenance, cleaning or replacement of the filtering component. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 Structural schematic diagram of the filtering device provided by the embodiment of the present utility model installed in a pipeline system;

[0023] Figure 2 Cross-sectional structural schematic diagram of the filtering device provided by the embodiment of the present utility model installed in a pipeline system;

[0024] Figure 3 Three-dimensional structural schematic diagram of the three-way pipe provided by the embodiment of the present utility model;

[0025] Figure 4 Cross-sectional structural schematic diagram of the three-way pipe provided by the embodiment of the present utility model;

[0026] Figure 5 Three-dimensional structural schematic diagram of the filtering component provided by the embodiment of the present utility model;

[0027] Figure 6 Structural schematic diagram of the filter screen provided by the embodiment of the present utility model;

[0028] Figure 7Schematic structural diagram of the tower-shaped framework provided by the embodiment of the present utility model;

[0029] Figure 8 Exploded view of the filtering device provided by the embodiment of the present utility model.

[0030] Among them, each reference numeral in the figure:

[0031] 1 - tee pipe; 11 - first pipe; 12 - second pipe; 13 - third pipe; 14 - first interface; 15 - second interface; 16 - maintenance port; 17 - flange; 18 - limiting step;

[0032] 2 - filtering component; 21 - support body; 211 - first end face; 212 - second end face; 22 - filtering body; 221 - tower-shaped framework; 222 - filter screen;

[0033] 3 - closing component; 31 - flange blind plate; 32 - first seal; 33 - second seal; 34 - fastener; 4 - first pipeline; 5 - second pipeline. Detailed implementation manners

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0035] It should be noted that when an element is referred to as "connected to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined. In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0036] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appearing throughout the specification do not necessarily all refer to the same embodiment. Moreover, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0037] Please refer to Figures 1 to 8 , and now the filtering device provided by the embodiment of the present utility model will be described. The filtering device provided by the embodiment of the present utility model includes a multi-pass pipeline, a filtering component 2, and a closing component 3. The multi-pass pipeline includes a first pipeline 11 for connecting with a first pipeline 4, at least one second pipeline 12 for connecting with a second pipeline 5, and a third pipeline 13 for accommodating and positioning the filtering component 2. One end of the first pipeline 11 is connected to one end of the third pipeline 13, and the other end of the first pipeline 11 forms a first interface 14 communicating with the first pipeline 4. The other end of the third pipeline 13 has a maintenance port 16 for the filtering component 2 to be placed into the third pipeline 13. One end of the second pipeline 12 is connected to the side of the third pipeline 13, and one end of the second pipeline 12 communicates with the third pipeline 13. The other end of the second pipeline 12 forms a second interface 15 connecting with the second pipeline 5. The closing component 3 is used to open or close the maintenance port 16, and the closing component 3 is detachably installed at one end of the third pipeline 13 having the maintenance port 16. A part of the filtering component 2 is accommodated and positioned in the third pipeline 13, and the other part of the filtering component 2 can extend into the first pipeline 4 connected to the first pipeline 11 so that the filtering component 2 can filter impurities in the pipeline fluid.

[0038] During installation, it is only necessary to directly connect the first interface 14 and the second interface 15 of the multi-way pipe to the first pipeline 4 and the second pipeline 5 respectively, then place the filtering component 2 into the third pipeline 13 of the multi-way pipe through the maintenance port 16, and then use the sealing component 3 to seal the maintenance port 16. In this way, a part of the filtering component 2 can be accommodated and positioned in the third pipeline 13, and the other part of the filtering component 2 can extend into the first pipeline 4 connected to the first pipe 11. Since the multi-way pipe of the filtering device can replace the pipe joint connecting the first pipeline 4 and the second pipeline 5, and a part of the filtering component 2 is accommodated in the third pipeline 13, the convenient installation of the filtering component 2 can be realized without reserving a large installation space inside the pipeline system. Moreover, the other part of the filtering component 2 can extend into the first pipeline 4 connected to the first pipe 11, so that the filtering component 2 is not completely placed in the multi-way pipe of the filtering device. While increasing the space utilization rate in the pipeline system, it is also beneficial to streamline the structure of the filtering device and reduce the size of the filtering device. Therefore, there is no need to reserve a large installation space in the pipeline system to accommodate the entire filtering device, thus greatly saving the installation space. When it is necessary to maintain or replace the filtering component 2, it is only necessary to disassemble the sealing component 3 from the maintenance port 16 of the third pipeline 13 of the multi-way pipe, and then the filtering component 2 can be quickly taken out through the maintenance port 16, which is convenient for maintaining, cleaning or replacing the filtering component 2. It should be noted that the connection methods between the first pipe 11 and the first pipeline 4 include but are not limited to threaded connection, flange connection, welding, bonding or fusion welding, etc., and the connection methods between the second pipe 12 and the second pipeline 5 include but are not limited to threaded connection, flange connection, welding, bonding or fusion welding, etc. The materials of the multi-way pipe include but are not limited to carbon steel, stainless steel, PP, PE, PVC, etc.

[0039] The filtering device provided by the embodiment of the present invention, compared with the prior art, only needs to directly connect the first pipe 11 and at least one second pipe 12 of the multi-way pipe to the first pipeline 4 and the second pipeline 5 of the pipeline system respectively, then the multi-way pipe can be used to replace the pipe joint connecting the first pipeline 4 and the second pipeline 5, and then the filtering component 2 is placed through the maintenance port 16, so that a part of the filtering component 2 is accommodated and positioned in the third pipeline 13 of the multi-way pipe, and the other part extends into the first pipeline 4 connected to the first pipe 11. Since the filtering component 2 does not need to be completely placed in the multi-way pipe, it is beneficial to streamline the structure of the filtering device and reduce the overall size of the filtering device. Therefore, there is no need to reserve a large installation space in the pipeline system, and the positioning installation of the filtering component 2 can be conveniently realized. Moreover, when it is necessary to maintain or replace the filtering component 2, it is only necessary to remove the sealing component 3 from the maintenance port 16 of the third pipeline 13, and then the filtering component 2 can be quickly taken out through the maintenance port 16, which is convenient for maintaining, cleaning or replacing the filtering component 2.

[0040] In use, the first pipeline 4 is the liquid outlet pipe of the filtering device, and the second pipeline 5 is the liquid inlet pipe. The number of the second pipeline 5 and the second pipeline 12 connected to the second pipeline can be adjusted as needed. Preferably, the number of the second pipeline 5 and the second pipeline 12 is 1, that is, the multi-way pipeline is Figures 1 to 4 the tee pipeline 1 shown.

[0041] Please refer to Figure 1 、 Figure 2 and Figure 8 . In some embodiments, the closing assembly 3 includes a cover body, a first seal 32 and a second seal 33. The cover body is covered on the maintenance port 16 of the third pipeline 13 to achieve the function of closing the maintenance port 16 of the third pipeline 13. The first seal 32 is arranged at the connection between the cover body and the third pipeline 13 to improve the sealing performance of the cover body closing the maintenance port 16. The second seal 33 is arranged at the connection between the filtering component 2 and the third pipeline 13, which can improve the sealing performance of the connection between the filtering component 2 and the third pipeline 13, prevent the fluid medium in the third pipeline 13 from leaking through the joint between the filtering component 2 and the third pipeline 13, and reduce the filtering effect of the filtering device on the impurities in the fluid medium. The cover body is detachably installed at one end of the third pipeline 13 with the maintenance port 16, so that the cover body can open the maintenance port 16 of the third pipeline 13, which is convenient for later taking out the filtering component 2 through the maintenance port 16 and is beneficial to quickly maintaining or replacing the filtering component 2. It should be noted that the cover body can be, but is not limited to, a closing component such as a sealing cover, a sealing plate or a flange blind plate that can close the maintenance port. The cover body can be detachably installed on the third pipeline 13 by means of threaded connection, or the cover body can be detachably installed on the third pipeline 13 by means of bolt connection, or the cover body can also be detachably installed on the third pipeline 13 by means of snap connection, and can be reasonably selected according to actual use needs.

[0042] Please refer to Figure 1 、 Figure 3 and Figure 4 . In some embodiments, in order to facilitate the connection between the cover body and the third pipeline 13 and enhance the stability of the connection between the cover body and the third pipeline 13, a flange 17 is provided at one end of the third pipeline 13 with the maintenance port 16, and the cover body is connected to the flange 17 through a fastener 34. It should be noted that the fastener 34 can be, but is not limited to, a connecting member such as a bolt.

[0043] Please refer to Figure 2 、 Figure 5 and Figure 8, in some embodiments, the filtering component 2 includes a support body 21 and a filtering body 22. The filtering body 22 is disposed on the support body 21. Only by placing the filtering component 2 into the third pipe 13 of the tee pipe 1 through the maintenance port 16, the support body 21 can be accommodated and positioned in the third pipe 13, and a part of the filtering body 22 extends into the first pipeline 4 connected to the first pipe 11, so that the quick positioning and installation of the filtering component 2 can be achieved. It should be noted that the support body 21 is provided with a hollow structure that can reduce the flow resistance to allow the fluid medium to pass through smoothly.

[0044] Please refer to Figure 2 、 Figure 5 and Figure 6 , in some embodiments, the filtering body 22 includes a tower-shaped skeleton 221 or a conical skeleton connected to the support body 21, and a filter screen 222 disposed on the tower-shaped skeleton 221 or the conical skeleton. Since the support for the filter screen 222 is in the structure of a tower-shaped skeleton 221 or a conical skeleton, it can increase the effective filtering area of the filter screen 222 while reducing the flow resistance, and is beneficial to improving the space utilization rate of the pipeline system. Without the need to reserve a large additional installation space in the pipeline system, on the premise of ensuring that the filtering area of the filtering body 22 is large enough.

[0045] Please refer to Figure 7 , in some embodiments, the conical angle β of the tower-shaped skeleton 221 or the conical skeleton is 3° to 20°, and the length L of the tower-shaped skeleton 221 or the conical skeleton is 2 to 8 times the cross-sectional diameter of the first pipeline 4. Without the need to reserve a large additional installation space in the pipeline system, the conical angle β of the tower-shaped skeleton 221 or the conical skeleton can be flexibly designed and adjusted according to the actual filtering needs, and the length L of the tower-shaped skeleton 221 or the conical skeleton can be flexibly designed and adjusted, so as to flexibly adjust the filtering area of the filter screen 222 and the flow resistance of the filter screen 222.

[0046] Please refer to Figure 7 , in some embodiments, the conical angle β of the tower-shaped skeleton 221 or the conical skeleton is 3° to 20°, and the length L of the tower-shaped skeleton 221 or the conical skeleton is 2 to 8 times the cross-sectional diameter of the first pipeline 4. On the premise of reducing the size of the filtering component 2, the filtering area of the filter screen 222 can reach 10 to 15 times the cross-sectional diameter of the first pipeline 4, and the pore size of the filter screen 222 is 80 to 120 meshes, which can effectively improve the filtering area and filtering effect of the filtering component 2.

[0047] Please refer to Figure 4 、 Figure 5 and Figure 8, in some embodiments, the support 21 has a columnar frame structure. The axial two ends of the support 21 respectively have a first end face 211 and a second end face 212. A limiting step 18 for fitting and abutting against the first end face 211 is provided in the third pipe 13. When the first end face 211 of the support 21 abuts against the limiting step 18 in the third pipe 13, on the one hand, it can enhance the stability of the positioning and installation of the support 21 and prevent the support 21 from loosening or displacing. On the other hand, it can effectively improve the sealing performance at the connection between the support 21 and the third pipe 13 and prevent the fluid medium in the third pipe 13 from leaking through the joint between the support 21 and the third pipe 13.

[0048] Please refer to Figure 2 , Figure 5 and Figure 8 , in some embodiments, a flange 17 is provided at one end of the third pipe 13 having a maintenance port 16. The closing assembly 3 includes a flange blind plate 31 covering the maintenance port 16 and adapted to the flange 17, a first seal 32 provided between the flange blind plate 31 and the flange 17, a second seal 33 provided between the first end face 211 of the support 21 and the limiting step 18 of the third channel, and a fastener 34 for fastening the flange blind plate 31 to the flange 17. When the fastener 34 fastens the flange blind plate 31 to the flange 17, the flange blind plate 31 can squeeze the first seal 32 under the pre-tightening force of the fastener 34, and the flange blind plate 31 can push the support 21 under the pre-tightening force of the fastener 34 to make the support 21 squeeze the second seal 33. Thus, when installing the filtering component 2, only one fastening of the flange blind plate 31 is required to achieve simultaneous sealing between the flange blind plate 31 and the flange 17 and between the support 21 and the third channel, which is beneficial to improving the convenience of the installation operation of the filtering device. In addition, when disassembling the filtering component 2, only the fastener 34 needs to be removed to release the pre-tightening force of the fastener 34 on the flange blind plate 31, and then the filtering component 2 in the third pipe 12 can be conveniently taken out through the maintenance port 16, which is beneficial to improving the convenience of maintaining or replacing the filtering component 2. It should be noted that the first seal 32 can be, but is not limited to, a flange sealing ring made of materials such as rubber, silica gel or silicone rubber, and the second seal 33 can be, but is not limited to, an elastic sealing ring made of materials such as rubber, silica gel or silicone rubber.

[0049] Please refer to Figure 4, in some of these embodiments, the central axis of the first pipe 11 is parallel to or coincides with the central axis of the third pipe 13, and the included angle α between the central axis of the second pipe 12 and the central axis of the third pipe 13 is an acute angle, a right angle or an obtuse angle. It is only necessary to directly connect the first pipe 11 and the second pipe 12 of the three-way pipe 1 to the first pipeline 4 and the second pipeline 5 of the pipeline system respectively, so that the three-way pipe 1 can be used instead of the elbow connecting the first pipeline 4 and the second pipeline 5, so that no additional flow deflection will be generated in the filtering device, greatly reducing the flow resistance. In this way, the defect that the elbow connecting the first pipeline 4 and the second pipeline 5 generates a primary flow resistance and the filtering device generates another flow resistance, resulting in an excessive flow resistance of the pipeline system, is effectively overcome.

[0050] The foregoing are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A filtering device, characterized in that, Comprising: A filtering component for filtering impurities in a fluid; A multi-way pipe including a first pipe for connecting to a first pipeline, at least one second pipe for connecting to a second pipeline, and a third pipe for accommodating and positioning the filtering component. One end of the first pipe is connected to one end of the third pipe, the other end of the third pipe has a maintenance port for inserting the filtering component into the third pipe, and one end of the second pipe is connected to the side of the third pipe; and A closing assembly for opening or closing the maintenance port, the closing assembly being detachably mounted at one end of the third pipe having the maintenance port; Wherein, a part of the filtering component is accommodated and positioned in the third pipe, and another part of the filtering component can extend into the first pipeline connected to the first pipe.

2. The filtering device according to claim 1, characterized in that, The closing assembly includes a cover body covering the maintenance port, a first sealing member provided at the connection between the cover body and the third pipe, and a second sealing member provided at the connection between the filtering component and the third pipe, and the cover body is detachably mounted at one end of the third pipe having the maintenance port.

3. The filtering device according to claim 1, wherein, The multi-way pipe is a three-way pipe, and the number of the second pipes is 1.

4. The filtering device according to claim 1, wherein, The filtering component includes a support body for being accommodated and positioned in the third pipe and a filtering body provided on the support body, and the filtering body extends into the first pipeline connected to the first pipe.

5. The filtering device according to claim 4, wherein The filtering body includes a tower-shaped skeleton or a conical skeleton connected to the support body, and a filter screen provided on the tower-shaped skeleton or the conical skeleton.

6. The filtering device according to claim 5, characterized in that, The conical angle β of the tower-shaped skeleton or the conical skeleton is 3° to 20°, and the length L of the tower-shaped skeleton or the conical skeleton is 2 to 8 times the cross-sectional diameter of the first pipeline.

7. The filtering device according to claim 5, characterized in that, The filtering area of the filter screen is 10 to 15 times the cross-sectional diameter of the first pipeline.

8. The filtering device according to claim 4, wherein, The support body has a columnar frame structure, and the axial two ends of the support body respectively have a first end face and a second end face, and a limiting step for cooperatively abutting against the first end face is provided in the third pipe.

9. The filtering device according to claim 8, characterized in that, One end of the third pipe having the maintenance port is provided with a flange, and the closing assembly includes a flange blind plate covering the maintenance port and adapted to the flange, a first sealing member provided between the flange blind plate and the flange, a second sealing member provided between the first end face and the limiting step, and a fastener for fastening the flange blind plate to the flange; When the fastener fastens the flange blind plate to the flange, the flange blind plate can squeeze the first sealing member under the pre-tightening force of the fastener, and the flange blind plate can push the support body under the pre-tightening force of the fastener, so that the support body squeezes the second sealing member.

10. The filtering device according to any one of claims 1 to 9, characterized in that The central axis of the first pipe is parallel to or coincides with the central axis of the third pipe, and the included angle between the central axis of the second pipe and the central axis of the third pipe is an acute angle, a right angle or an obtuse angle.

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