Filtering device

Abstract

The invention provides a filtering device which comprises a filter and a flange assembly, and a tenon face flange and a groove face flange in the flange assembly are fixedly connected, so that the filter is internally arranged. The overall structure is simple, installation is convenient, meanwhile, a heat insulation structure and a sealing structure do not need to be additionally arranged, and the production cost is reduced. Secondly, the filtering device is convenient to check, the vacuum flange connecting pipeline can be opened generally when the medium is filled or transferred into the vacuum pipeline, the vacuum flange connecting pipeline can be detached after the medium is filled or transferred, and at the moment, the filter can be cleaned, and special detaching operation for checking is not needed. In addition, low-temperature liquid flowing in the low-temperature vacuum hose and the vacuum pipeline can be filtered through the filter screen from the through opening, and the low-temperature liquid can flow through the opening and the via hole of the filter main body, so that bidirectional filtration of the low-temperature liquid in the filter is realized, the use is convenient, and the use safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of cryogenic liquid transfer equipment, and in particular to a filtering device. Background Art

[0002] When cryogenic liquid is added to a cryogenic pressure vessel through a vacuum pipeline or is transferred from a cryogenic pressure vessel to other equipment, a filter is generally required to be installed in the vacuum pipeline to prevent excess matter mixed in the cryogenic liquid from entering the equipment and affecting the normal operation of the equipment.

[0003] At present, filters are generally Y-type filters, T-type filters and basket filters. When the medium flows through these three types of filters, the flow direction of the medium will change, resulting in a large flow resistance. In addition, the above three types of filters all require specially made filter housings. When installed in the inner tube of the vacuum pipeline, they occupy a large space and need to add a vacuum sleeve on the outside of the filter. The structure is complex, the heat leakage is large, the cost is high, and there is a risk of leakage, which affects the effective transportation of cryogenic liquids. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems in the prior art that filters used in cryogenic liquid transportation have large flow resistance, complex structure and leakage risk.

[0005] In order to solve the above technical problems, the present invention provides a filtering device, including a filter and a flange assembly. The filter includes a filtering body and a filtering net; a filtrate channel is provided inside the filtering body, an opening is provided at one end of the filtering body, and a through hole communicating with the filtrate channel is provided at the other end; the filtering body is formed with an interlayer, and a through hole is provided on the side wall of the filtering body; the filtering net is arranged in the interlayer, and the filtrate channel is communicated with the mesh of the filtering net through the through hole; the flange assembly includes a tenon flange and a groove flange, the tenon flange is used to be connected to the end of a cryogenic vacuum hose, and the groove flange is used to be connected to the interface of a vacuum pipe of a cryogenic pressure vessel; the end of the filtering body provided with an opening is detachably connected to the groove flange, so that the filter is accommodated inside the vacuum pipe; the tenon flange and the groove flange are detachably connected, so that the inside of the cryogenic vacuum hose is connected with the inside of the vacuum pipe, so that the cryogenic liquid flowing in the cryogenic vacuum hose and the vacuum pipe can be filtered by the filter.

[0006] Optionally, the filter body includes a bracket body and a sealing cover connected to the bracket body, the bracket body includes an outer bracket and an inner bracket, the outer bracket and the inner bracket are both cylindrical structures with openings at both ends and hollow inside, the outer bracket is sleeved on the outside of the inner bracket, and the gap between the outer bracket and the inner bracket constitutes an interlayer of the filter body, and the internal space of the inner bracket constitutes the filtrate channel; the sealing cover is connected to an opening at one end of the inner bracket, and the through hole is opened on the sealing cover.

[0007] Optionally, in the axial direction of the bracket body, the cross-section of the bracket body tends to gradually decrease; the openings at both ends of the outer bracket and the inner bracket are large ports and small ports, and the cover is connected to the small port of the inner bracket.

[0008] Optionally, the filter body includes a connecting flange, which is annular and fixed at the large ports corresponding to the outer bracket and the inner bracket; in the axial direction of the filter body, the connecting flange is provided with a plurality of connecting holes along its own circumference.

[0009] Optionally, the groove surface flange includes a groove surface inner ring and a groove surface outer ring arranged on the outer periphery of the groove surface inner ring, the groove surface inner ring is used to connect the inner tube of the vacuum pipe, and the groove surface outer ring is used to connect the outer tube of the vacuum pipe; the end face of the groove surface inner ring is provided with an annular mounting groove, and the mounting groove is provided with a fixing hole along the axial direction of the groove surface flange; the connecting flange is partially accommodated in the mounting groove, and the connecting hole corresponds to the fixing hole; the filtering device also includes a fastener, which is passed through the connecting hole and the fixing hole, so that the connecting flange is fixed on the groove surface inner ring, and the filter is accommodated inside the inner tube of the vacuum pipe.

[0010] Optionally, the tenon flange includes a tenon inner ring and a tenon outer ring arranged on the outer periphery of the tenon inner ring, the tenon inner ring is used to connect the inner tube of the low-temperature vacuum hose, and the tenon outer ring is used to connect the outer tube of the low-temperature vacuum hose; the tenon outer ring is provided with a tenon assembly hole along the axial direction of the tenon flange, and the groove outer ring is provided with a groove assembly hole along the axial direction of the groove flange; the filtering device also includes an assembly part, the tenon flange is docked with the groove flange, and the assembly part is passed through the corresponding tenon assembly hole and the groove assembly hole to connect and fix the tenon flange and the groove flange.

[0011] Optionally, the tenon inner ring includes a tenon inner body and a tenon fixing arm protruding from the tenon inner body, and the tenon inner body and the tenon fixing arm are both annular; an annular accommodating groove is provided on the end face of the groove inner ring, and when the tenon flange is connected to the groove flange, the tenon fixing arm is clamped in the accommodating groove.

[0012] Optionally, the filtering device further comprises a gasket, and the gasket is arranged between the end surface of the tenon surface fixing arm and the accommodating groove.

[0013] Optionally, the tenon outer ring includes a tenon outer body and a tenon connecting arm protruding on the side wall of the tenon outer body, the tenon outer body and the tenon connecting arm are both annular, and the tenon assembly hole is provided on the tenon outer body; the groove outer ring includes a groove outer body and a groove connecting arm protruding on the side wall of the groove outer body, the groove outer body and the groove connecting arm are both annular, and the groove assembly hole is provided on the groove outer body; when the tenon flange and the groove flange are connected to each other, the groove connecting arm is arranged around the outer periphery of the tenon connecting arm, and the inner surface of the groove connecting arm is in contact with the outer surface of the tenon connecting arm.

[0014] Optionally, an annular groove is formed on the outer periphery of the tenon surface connecting arm, and the filtering device further comprises a sealing ring, which is arranged in the groove, and the outer periphery of the sealing ring abuts against the inner surface of the groove surface connecting arm.

[0015] It can be seen from the above technical scheme that the beneficial effects of the present invention are as follows: the filtering device of the present invention includes a filter and a flange assembly, and the connection and fixation of the tenon flange and the groove flange in the flange assembly realize the built-in filter. This arrangement has a simple overall structure and is easy to install. At the same time, there is no need to add additional insulation structure and sealing structure, which reduces the production cost. Secondly, the filtering device is easy to inspect. Generally, when the vacuum pipeline is filling or transporting the medium, the vacuum flange connecting pipeline will be opened. After the filling or transporting of the medium is completed, the vacuum flange connecting pipeline will be removed. At this time, the filter can be cleaned without the need for special disassembly and inspection. In addition, the low-temperature liquid circulating in the low-temperature vacuum hose and the vacuum pipeline can be filtered through the filter screen through the through port, and the opening and through hole of the filter body can circulate the low-temperature liquid, thereby realizing two-way filtration of the low-temperature solution in the filter, which is easy to use and improves the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of an embodiment of a filtering device of the present invention.

[0017] Figure 2 yes Figure 1 A schematic diagram of the structure of the tenon flange in the filtering device shown.

[0018] Figure 3 yes Figure 1 The schematic diagram of the structure of the grooved flange in the filtering device is shown.

[0019] Figure 4 yes Figure 1 Schematic diagram of the structure of the filter in the filtering device shown.

[0020] The reference numerals are as follows: 100, filter device; 10, filter; 11, filter body; 12, filter screen; 13, inner bracket; 14, outer bracket; 15, cover; 16, port; 17, connecting flange; 18, connecting hole; 20, flange assembly; 21, tenon flange; 211, tenon inner ring; 2111, tenon inner body; 2112, tenon fixing arm; 212, tenon outer ring; 2121, tenon outer Main body; 2122, tenon surface connecting arm; 2123, tenon surface assembly hole; 2124, groove; 22, groove surface flange; 221, groove surface inner ring; 2211, mounting groove; 2212, accommodation groove; 2213, fixing hole; 222, groove surface outer ring; 2221, groove surface outer body; 2222, groove surface connecting arm; 2223, groove surface assembly hole; 30, fastener; 40, gasket, 50, sealing ring; 60, assembly parts. DETAILED DESCRIPTION

[0021] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0022] In the description of the present application, it should be understood that in the embodiments shown in the drawings, the indications of directions or positional relationships (such as up, down, left, right, front and back, etc.) are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] See also Figure 1An embodiment of the present application provides a filtering device 100, which includes a filter 10 and a flange assembly 20. The filtering device 100 can be used to filter the cryogenic liquid when the cryogenic liquid is filled into a cryogenic pressure vessel through a vacuum pipeline or when it is transported from a cryogenic pressure vessel to other equipment, so as to prevent the excess materials mixed in the cryogenic liquid from entering the equipment and ensure the normal use of the equipment.

[0025] Specifically, the filter 10 includes a filter body 11 and a filter screen 12. A filtrate channel is provided inside the filter body 11, an opening is provided at one end of the filter body 11, and a through hole communicating with the filtrate channel is provided at the other end. The filter body 11 is formed with an interlayer, and a through hole 16 is provided on the side wall of the filter body 11. The filter screen 12 is arranged in the interlayer, and the filtrate channel is communicated with the mesh of the filter screen 12 through the through hole 16.

[0026] The flange assembly 20 includes a tongue flange 21 and a groove flange 22. The tongue flange 21 is used to connect to the end of a cryogenic vacuum hose, and the groove flange 22 is used to connect to the interface of a vacuum pipe of a cryogenic pressure vessel. The filter body 11 is provided with an open end that is detachably connected to the groove flange 22 so that the filter 10 is accommodated inside the vacuum pipe. The tongue flange 21 and the groove flange 22 are detachably connected to each other so that the inside of the cryogenic vacuum hose is connected to the inside of the vacuum pipe, so that the cryogenic liquid flowing in the cryogenic vacuum hose and the vacuum pipe can be filtered by the filter 10.

[0027] Combination Figure 2 As shown, in this embodiment, the tenon flange 21 is used to connect to the end of the cryogenic vacuum hose, and the cryogenic vacuum hose includes an inner tube and an outer tube sleeved outside the inner tube. The tenon flange 21 of this embodiment includes a tenon inner ring 211 and a tenon outer ring 212 arranged on the outer periphery of the tenon inner ring 211, the tenon inner ring 211 is used to connect to the inner tube of the cryogenic vacuum hose, and the tenon outer ring 212 is used to connect to the outer tube of the cryogenic vacuum hose.

[0028] The tenon outer ring 212 includes a tenon outer body 2121 and a tenon connecting arm 2122 protruding from the side wall of the tenon outer body 2121. The tenon outer body 2121 and the tenon connecting arm 2122 are both annular. The tenon outer body 2121 is used to connect with the outer tube of the cryogenic vacuum hose. The tenon outer body 2121 is provided with a tenon assembly hole 2123, which extends along the axis direction of the tenon flange 21.

[0029] In this embodiment, a plurality of tenon assembly holes 2123 may be provided, and the plurality of tenon assembly holes 2123 are arranged on the tenon outer body 2121 at intervals along the circumference of the tenon flange 21 .

[0030] In addition, a groove 2124 is formed on the tenon connecting arm 2122 of the present embodiment. The groove 2124 is arranged on the outer periphery of the tenon connecting arm 2122 and has a ring shape.

[0031] In this embodiment, the tenon inner ring 211 includes a tenon inner body 2111 and a tenon fixing arm 2112. The tenon fixing arm 2112 is convexly arranged on the end surface of the tenon inner body 2111. Both the tenon inner body 2111 and the tenon fixing arm 2112 are annular. The tenon inner body 2111 of this embodiment is used to connect with the inner tube of the low-temperature hose.

[0032] Further, see Figure 3 The grooved surface flange 22 is used to connect to the interface of the vacuum pipe of the cryogenic pressure vessel, and the vacuum pipe includes an inner pipe and an outer pipe arranged outside the inner pipe. The grooved surface flange 22 of this embodiment includes a grooved surface inner ring 221 and a grooved surface outer ring 222 arranged on the outer periphery of the grooved surface inner ring 221, the grooved surface inner ring 221 is used to connect to the inner pipe of the vacuum pipe, and the grooved surface outer ring 222 is used to connect to the outer pipe of the vacuum pipe.

[0033] The groove surface outer ring 222 includes a groove surface outer body 2221 and a groove surface connecting arm 2222 protruding on the side wall of the groove surface outer body 2221. The groove surface outer body 2221 and the groove surface connecting arm 2222 are both annular. The groove surface outer body 2221 is used to connect with the outer tube of the vacuum pipe. The groove surface outer body 2221 is provided with a groove surface assembly hole 2223, which extends along the axial direction of the groove surface flange 22.

[0034] In this embodiment, a plurality of groove surface assembly holes 2223 may be provided, and the plurality of groove surface assembly holes 2223 are arranged on the groove surface outer body 2221 at intervals along the circumferential direction of the groove surface flange 22 .

[0035] The groove surface inner ring 221 of this embodiment is used to connect with the inner tube of the vacuum pipeline. The end surface of the groove surface inner ring 221 is provided with an annular mounting groove 2211. The mounting groove 2211 is provided with a fixing hole 2213 along the axial direction of the groove surface flange 22. In this embodiment, the end surface of the groove surface inner ring 221 is further provided with a receiving groove 2212. The receiving groove 2212 is annular and arranged outside the mounting groove 2211.

[0036] Further, see Figure 4 The filter 10 of this embodiment includes a filter body 11 and a filter screen 12. A filtrate channel is provided inside the filter body 11, an opening is provided at one end of the filter body 11, and a through hole communicating with the filtrate channel is provided at the other end. The filter body 11 is formed with an interlayer, and a through hole 16 is provided on the side wall of the filter body 11. The filter screen 12 is arranged in the interlayer, and the filtrate channel is communicated with the mesh of the filter screen 12 through the through hole 16.

[0037] In this embodiment, the filter body 11 includes a support body and a cover 15 connected to the support body. The support body includes an outer support 14 and an inner support 13. Both the outer support 14 and the inner support 13 are cylindrical structures with openings at both ends and hollow inside. The outer support 14 is sleeved on the outside of the inner support 13, and the gap between the outer support 14 and the inner support 13 constitutes an interlayer of the filter body 11, and the internal space of the inner support 13 constitutes a filtrate channel. The cover 15 is connected to an opening at one end of the inner support 13, and a through hole is provided on the cover 15.

[0038] The bracket body of this embodiment is a tapered structure, and the cross section of the bracket body is gradually reduced in the axial direction of the bracket body. The openings at both ends of the outer bracket 14 and the inner bracket 13 are large ports and small ports, and the cover 15 is connected to the small port of the inner bracket 13.

[0039] Both the outer bracket 14 and the inner bracket 13 are provided with through openings 16 . When the outer bracket 14 is sleeved on the outer periphery of the inner bracket 13 , the through openings 16 of the outer bracket 14 and the through openings 16 of the inner bracket 13 are arranged in a one-to-one correspondence.

[0040] In this embodiment, the filter body 11 includes a connection flange 17, which is annular and fixed to the corresponding large ports of the outer bracket 14 and the inner bracket 13. In the axial direction of the filter body 11, the connection flange 17 is provided with a plurality of connection holes 18 along its own circumference.

[0041] When manufacturing the filter 10 of this embodiment, the connecting flange 17, the outer bracket 14, the inner bracket 13, the filter screen 12, and the cover 15 can be made of austenitic stainless steel, and the filter screen 12 is a mesh structure, which can be made of a stainless steel wire mesh. The inner bracket 13 and the outer bracket 14 are generally made of steel plates cut into a mesh structure, rolled into a cone barrel, and welded, and the cover 15 is formed by stamping or rolling and welding, and a plurality of through holes are formed on the surface of the cover 15.

[0042] After the components are manufactured, the connecting flange 17 is first welded to the inner bracket 13 and the cover 15, and then the filter screen 12 is evenly spot welded to the inner bracket 13 and the cover 15 by an electric welder. At this time, the end of the filter screen 12 is sealed by welding with an electric welder and by pressing with the connecting flange 17, and then a transition piece is provided, through which the outer bracket 14 is welded to the outer periphery of the inner bracket 13, and the through-port 16 of the outer bracket 14 corresponds to the through-port 16 on the inner bracket 13.

[0043] Combination Figure 1As shown, the filter 10 is connected to the groove surface flange 22, the connection flange 17 of the filter 10 is partially accommodated in the installation groove 2211, and the connection hole 18 corresponds to the fixing hole 2213. The filter device 100 also includes a fastener 30, which is penetrated through the connection hole 18 and the fixing hole 2213, so that the connection flange 17 is fixed on the groove surface inner ring 221, and the filter 10 is accommodated inside the inner tube of the vacuum pipeline.

[0044] Multiple connection holes 18 and fixing holes 2213 can be provided, and multiple fasteners 30 are provided correspondingly. Multiple fasteners 30 are inserted into the corresponding connection holes 18 and fixing holes 2213 one by one to achieve the fixing of the filter 10 on the groove surface flange 22. The fasteners 30 can be screws or pins, which are not limited too much here.

[0045] After the filter 10 is fixed on the groove surface flange 22, the groove surface flange 22 is connected to the tenon surface flange 21. Specifically, the tenon surface fixing arm 2112 is clamped in the receiving groove 2212 of the groove surface flange 22, the groove surface connecting arm 2222 is arranged around the outer periphery of the tenon surface connecting arm 2122, and the inner surface of the groove surface connecting arm 2222 is in contact with the outer surface of the tenon surface connecting arm 2122.

[0046] In this embodiment, the filter device 100 further includes a gasket 40 and a sealing ring 50. The gasket 40 is disposed between the end surface of the tenon surface fixing arm 2112 and the accommodating groove 2212 to prevent wear between the tenon surface fixing arm 2112 and the groove surface flange 22. The sealing ring 50 is disposed in a groove 2124 provided on the outer periphery of the tenon surface connecting arm 2122, and the outer periphery of the sealing ring 50 abuts against the inner surface of the groove surface connecting arm 2222 to ensure the sealing of the connection between the tenon surface flange 21 and the groove surface flange 22.

[0047] After the tenon flange 21 and the groove flange 22 are butted, the tenon assembly holes 2123 correspond to the groove assembly holes 2223. The filter device 100 of this embodiment also includes an assembly part, which is inserted into the corresponding tenon assembly holes 2123 and groove assembly holes 2223 to connect and fix the tenon flange 21 and the groove flange 22.

[0048] The connection and fixation of the tenon flange and the groove flange realizes the built-in filter. This arrangement has a simple overall structure and is easy to install. At the same time, there is no need to add additional insulation structure and sealing structure, which reduces the production cost. Secondly, the filtering device is easy to inspect. Generally, when the vacuum pipeline is filling or transporting the medium, the vacuum flange connecting pipeline will be opened. After the filling or transporting of the medium is completed, the vacuum flange connecting pipeline will be removed. At this time, the filter can be cleaned without the need for special disassembly and inspection. In addition, the cryogenic liquid circulating in the cryogenic vacuum hose and the vacuum pipeline can be filtered through the filter net through the through port, and the opening and through holes of the filter body can circulate the cryogenic liquid, thereby realizing two-way filtration of the cryogenic solution in the filter, which is easy to use and improves the safety of use.

[0049] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A filtering device, characterized in that: include: A filter, comprising a filter body and a filter screen; a filtrate channel is provided inside the filter body, an opening is provided at one end of the filter body, and a through hole communicating with the filtrate channel is provided at the other end; an interlayer is formed on the filter body, and a through hole is provided on the side wall of the filter body; the filter screen is arranged in the interlayer, and the filtrate channel is communicated with the mesh of the filter screen through the through hole; A flange assembly includes a tenon flange and a groove flange, wherein the tenon flange is used to be connected to the end of a cryogenic vacuum hose, and the groove flange is used to be connected to the interface of a vacuum pipe of a cryogenic pressure vessel; the filter body is provided with an open end which is detachably connected to the groove flange so that the filter can be accommodated inside the vacuum pipe; the tenon flange and the groove flange are detachably connected to each other so that the interior of the cryogenic vacuum hose is connected to the interior of the vacuum pipe, so that the cryogenic liquid flowing in the cryogenic vacuum hose and the vacuum pipe can be filtered by the filter.

2. The filtering device according to claim 1, characterized in that: The filter body includes a bracket body and a sealing cover connected to the bracket body, the bracket body includes an outer bracket and an inner bracket, the outer bracket and the inner bracket are both cylindrical structures with openings at both ends and hollow inside, the outer bracket is sleeved on the outside of the inner bracket, and the gap between the outer bracket and the inner bracket constitutes the interlayer of the filter body, and the internal space of the inner bracket constitutes the filtrate channel; the sealing cover is connected to an opening at one end of the inner bracket, and the through hole is opened on the sealing cover.

3. The filtering device according to claim 2, characterized in that: In the axial direction of the bracket body, the cross section of the bracket body tends to gradually decrease; both end openings of the outer bracket and the inner bracket are large ports and small ports, and the cover is connected to the small port of the inner bracket.

4. The filtering device according to claim 3, characterized in that: The filter body comprises a connecting flange, which is annular and fixed at the corresponding large ports of the outer bracket and the inner bracket; in the axial direction of the filter body, the connecting flange is provided with a plurality of connecting holes along its own circumference.

5. The filtering device according to claim 4, characterized in that: The groove surface flange includes a groove surface inner ring and a groove surface outer ring arranged on the outer periphery of the groove surface inner ring, the groove surface inner ring is used to connect the inner tube of the vacuum pipeline, and the groove surface outer ring is used to connect the outer tube of the vacuum pipeline; The end face of the inner ring of the groove surface is provided with an annular mounting groove, and a fixing hole is provided at the mounting groove along the axial direction of the groove surface flange; the connecting flange is partially accommodated in the mounting groove, and the connecting hole corresponds to the fixing hole; the filtering device also includes a fastener, and the fastener is passed through the connecting hole and the fixing hole, so that the connecting flange is fixed on the inner ring of the groove surface, and the filter is accommodated inside the inner tube of the vacuum pipe.

6. The filtering device according to claim 5, characterized in that: The tenon flange includes a tenon inner ring and a tenon outer ring arranged on the outer periphery of the tenon inner ring, the tenon inner ring is used to connect the inner tube of the cryogenic vacuum hose, and the tenon outer ring is used to connect the outer tube of the cryogenic vacuum hose; The tenon outer ring is provided with a tenon assembly hole along the axial direction of the tenon flange, and the groove outer ring is provided with a groove assembly hole along the axial direction of the groove flange; the filtering device also includes an assembly part, the tenon flange is connected to the groove flange, and the assembly part is passed through the corresponding tenon assembly hole and the groove assembly hole to connect and fix the tenon flange and the groove flange.

7. The filtering device according to claim 6, characterized in that: The tenon inner ring includes a tenon inner body and a tenon fixing arm protruding from the tenon inner body, and both the tenon inner body and the tenon fixing arm are annular; an annular accommodating groove is provided on the end surface of the groove inner ring, and when the tenon flange is connected to the groove flange, the tenon fixing arm is clamped in the accommodating groove.

8. The filtering device according to claim 7, characterized in that: The filtering device further comprises a gasket, which is arranged between the end surface of the tenon surface fixing arm and the accommodating groove.

9. The filtering device according to claim 6, characterized in that: The tenon outer ring includes a tenon outer body and a tenon connecting arm convexly arranged on the side wall of the tenon outer body, the tenon outer body and the tenon connecting arm are both annular, and the tenon assembly hole is provided on the tenon outer body; The groove surface outer ring includes a groove surface outer body and a groove surface connecting arm convexly arranged on the side wall of the groove surface outer body, the groove surface outer body and the groove surface connecting arm are both annular, and the groove surface assembly hole is provided on the groove surface outer body; When the tenon face flange and the groove face flange are butted against each other, the groove face connecting arm is arranged around the outer periphery of the tenon face connecting arm, and the inner surface of the groove face connecting arm is in contact with the outer surface of the tenon face connecting arm.

10. The filtering device according to claim 9, characterized in that: An annular groove is formed on the outer periphery of the tenon surface connecting arm. The filtering device further comprises a sealing ring which is arranged in the groove. The outer periphery of the sealing ring abuts against the inner surface of the groove surface connecting arm.

Images