Filter

Abstract

The utility model is suitable for the technical field of communication, and provides a filter, which comprises a shell with an inner cavity; the accommodating sleeve comprises a main body part and a clamping part which are connected with each other and define an internal channel, the internal channel is communicated with the inner cavity, and the main body part penetrates through the side wall of the shell; and the fixing sleeve is detachably arranged on the outer side of the containing sleeve in a sleeving mode, the fixing sleeve comprises a sleeving connection piece and an extrusion structure connected to the inner side of the sleeving connection piece, and the extrusion structure is used for extruding the clamping part when the containing sleeve is sleeved with the fixing sleeve so that the clamping part can contract in the axis direction of the inner channel. According to the filter, the containing sleeve is fixed to the side wall of the shell through the sleeving piece, extrusion force is applied to the clamping part of the containing sleeve through the extrusion structure, the clamping part is forced to contract and clamp the cable, the cable is easier to assemble and disassemble, and then maintenance of the filter is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of communication, and in particular relates to a filter. Background Art

[0002] Filters often require cables for signal transmission, and a fixing structure for fixing the cables is generally provided on the filter housing to ensure stable and reliable cable installation. However, most of the cable fixing structures of filters in the prior art are inconvenient to disassemble, which seriously affects the subsequent repair and maintenance. Utility Model Content

[0003] The utility model aims to provide a filter, aiming to solve the technical problems in the prior art that the cable fixing structure on the filter is inconvenient to disassemble and affects the subsequent maintenance.

[0004] The utility model provides a filter, comprising:

[0005] a housing having an inner cavity;

[0006] A receiving sleeve, comprising a main body portion and a clamping portion connected to each other and defining an internal passage, wherein the internal passage communicates with the inner cavity, and the main body portion penetrates through the side wall of the shell;

[0007] A fixing sleeve is detachably sleeved on the outer side of the accommodating sleeve, and the fixing sleeve comprises a sleeve connector and an extrusion structure connected to the inner side of the sleeve connector, and the extrusion structure is used to squeeze the clamping portion when the fixing sleeve is sleeved on the accommodating sleeve so that the clamping portion contracts toward the axial direction of the internal channel.

[0008] In some embodiments, along the direction from the clamping portion to the main body portion, the inner diameter of the extrusion structure gradually increases.

[0009] In some embodiments, the extruded structure is overall in a conical shape.

[0010] In some embodiments, the clamping portion is provided with a guide surface cooperating with the extrusion structure.

[0011] In some embodiments, the clamping portion and the main body are coaxially arranged and are an integral structure; and / or the sleeve and the extrusion structure are an integral structure.

[0012] In some embodiments, the clamping portion includes a plurality of clamping bars, the plurality of clamping bars are spaced apart and distributed around the axis of the internal channel, and each of the clamping bars extends along the axial direction of the internal channel.

[0013] In some embodiments, a side of each clamping strip facing away from the internal channel is provided with a guiding inclined surface matched with the extrusion structure.

[0014] In some embodiments, the inner wall of the sleeve is threadedly connected to the outer wall of the main body.

[0015] In some embodiments, a through hole is provided on the side wall of the shell, and the main body is detachably inserted into the through hole.

[0016] In some embodiments, the accommodating sleeve further comprises a limiting portion connected to an end of the main body away from the clamping portion, and the limiting portion and the sleeve connector respectively abut against opposite sides of the side wall of the shell.

[0017] The filter provided by the embodiment of the utility model has the main body of the accommodating sleeve penetrate the side wall of the shell, so that the internal channel of the accommodating sleeve is connected to the inner cavity of the filter, so that the cable can be inserted into the inner cavity, and the accommodating sleeve is fixed to the side wall of the shell by the sleeve connector of the fixing sleeve, and the clamping part of the accommodating sleeve is applied with an extrusion force by the extrusion structure of the fixing sleeve, so that the clamping part is forced to contract and clamp the cable, so as to realize the assembly of the cable. Conversely, the clamping part can release the cable by loosening the fixing sleeve from the accommodating sleeve, so as to realize the disassembly of the cable. Through the cooperation of the accommodating sleeve and the fixing sleeve, the assembly and disassembly operations of the cable are simplified, so as to facilitate the maintenance of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of a local structure of a filter in the prior art;

[0020] Figure 2 It is a partial structural schematic diagram of a filter provided by an embodiment of the utility model;

[0021] Figure 3 It is a partial cross-sectional structural schematic diagram of a filter provided by an embodiment of the utility model;

[0022] Figure 4 yes Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0023] Figure 5 It is a structural schematic diagram of a receiving sleeve provided in an embodiment of the utility model;

[0024] Figure 6It is a schematic cross-sectional structural diagram of a fixing sleeve provided in an embodiment of the utility model;

[0025] Figure 7 It is a partial cross-sectional structural schematic diagram of the connection between the fixing sleeve and the accommodating sleeve provided by the embodiment of the utility model;

[0026] Figure 8 It is a partial structural schematic diagram of a shell provided in an embodiment of the utility model.

[0027] Description of reference numerals:

[0028] 1. Shell; 10. Inner cavity; 11. Through hole; 2. Accommodating sleeve; 21. Main body; 22. Clamping part; 221. Clamping strip; 222. Connecting end; 223. Free end; 23. Guide surface; 231. Guide slope; 24. Limiting part; 241. Operating structure; 3. Fixing sleeve; 31. Socket connector; 32. Extrusion structure; 4. Internal channel; 41. Axis; 5. Cable;

[0029] 1a, housing; 2a, metal cylinder; 3a, mounting groove; 4a, cable. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] 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. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] like Figure 1 As shown, when installing the cable 4a of the current filter, the cable 4a is generally passed through a metal cylinder 2a with a knurled surface and the two are welded, wherein the extension direction of the cable 4a is roughly perpendicular to the axial direction of the metal cylinder 2a. The metal cylinder 2a is then crimped into the installation groove 3a on the side wall of the housing 1a. However, with the above-mentioned installation method, it is very difficult to disassemble the metal cylinder 2a after installation, which will cause difficulty in disassembly of the cable 4a, causing inconvenience for subsequent maintenance and repair. In order to solve the problem of difficulty in disassembly of the cable 4a in the prior art, the present application proposes the following solution:

[0036] Please refer to Figures 2 to 8 As shown, in an embodiment of the utility model, a filter is provided, and the filter includes a housing 1, a receiving sleeve 2, and a fixing sleeve 3. The housing 1 has an inner cavity 10; the receiving sleeve 2 includes a main body 21 and a clamping portion 22 which are connected to each other and define an inner channel 4, the inner channel 4 is connected to the inner cavity 10, and the main body 21 passes through the side wall of the housing 1. The inner channel 4 has an axis 41, which is also the axis of the receiving sleeve 2. The fixing sleeve 3 is detachably mounted on the outer side of the receiving sleeve 2, and the fixing sleeve 3 includes a sleeve connector 31 and an extrusion structure 32 connected to the inner side of the sleeve connector 31, and the extrusion structure 32 is used to squeeze the clamping portion 22 when the fixing sleeve 3 is mounted on the receiving sleeve 2, so that the clamping portion 22 shrinks in the direction of the axis 41 of the inner channel 4.

[0037] Among them, the shell 1 generally refers to a component with a storage space inside, and a filter element is installed in the storage space. The main body 21 and the clamping part 22 of the storage sleeve 2 are both hollow cylindrical parts. After the two are connected end to end, their internal cavities are also connected to form an internal channel 4. The two can also be integrally formed into the storage sleeve 2 as a whole. The main body 21 of the storage sleeve 2 penetrates the side wall of the shell 1, so that the internal channel 4 can be connected to the inner cavity 10, and the cable 5 extends into the inner cavity 10 from the internal channel 4 of the storage sleeve 2. Among them, the main body 21 penetrates the side wall of the shell 1 and generally refers to any wall of the shell 1 that the main body 21 penetrates, such as the top wall, the bottom wall, and the peripheral side wall. The specific shape of the internal channel 4 and its axis 41 can be a straight line, an arc line or an irregular curve. The specific shape is suitable for passing the line and does not need to be strictly limited. The fixing sleeve 3 is used to fix the storage sleeve 2 on the side wall of the shell 1, and cooperates with the clamping part 22 to fix and clamp the cable 5.

[0038] When the cable 5 needs to be installed, the accommodating sleeve 2 is first installed on the side wall of the shell, and the cable 5 is passed through the fixing sleeve 3 and the accommodating sleeve 2 in sequence, so that the cable 5 passes through the side wall of the shell 1, and the two ends of the cable 5 are respectively located outside the shell 1 and in the inner cavity 10. After the end of the cable 5 is connected to the components in the inner cavity 10, the sleeve 31 of the fixing sleeve 3 is moved to the periphery of the main body 21 of the accommodating sleeve 2 and the sleeve 31 is fixed to the main body 21 to prevent the main body 21 from loosening. The extrusion structure 32 presses the clamping part 22 of the accommodating sleeve 2 inward, forcing the clamping part 22 to shrink toward the axis 41 of the internal channel 4, thereby clamping the cable 5. When the cable 5 needs to be removed, the fixing sleeve 3 is loosened and removed from the accommodating sleeve 2 as a whole, and the clamping effect of the extrusion structure 32 on the clamping part 22 is released, and the cable 5 can be taken out.

[0039] It can be understood that the fixing sleeve 3 can be located in the inner cavity 10 of the housing 1 or outside the housing 1. Preferably, in order to facilitate the removal of the cable 5 from the outside of the housing 1 and save space in the inner cavity 10, the clamping portion 22 of the accommodating sleeve 2 can be installed toward the outside of the housing 1, and the fixing sleeve 3 can be assembled on the outside of the housing 1.

[0040] The filter provided by the embodiment of the utility model has the main body 21 of the accommodating sleeve 2 penetrate the side wall of the housing 1, so that the internal channel 4 of the accommodating sleeve 2 is connected to the inner cavity 10 of the filter, so that the cable 5 is inserted therein and extends into the inner cavity 10, and the accommodating sleeve 2 is fixed to the side wall of the housing 1 by the sleeve connector 31 of the fixing sleeve 3, and the clamping part 22 of the accommodating sleeve 2 is applied with an extrusion force by the extrusion structure 32 of the fixing sleeve 3, so that the clamping part 22 is forced to contract and clamp the cable 5, so as to realize the assembly of the cable 5. Conversely, by loosening the fixing sleeve 3 from the accommodating sleeve 2, the clamping part 22 can release the cable 5, so as to realize the disassembly of the cable 5. Through the cooperation of the accommodating sleeve 2 and the fixing sleeve 3, the assembly and disassembly operations of the cable 5 are simplified, thereby facilitating the maintenance of the filter.

[0041] Furthermore, the present embodiment adopts the fixing sleeve 3 and the accommodating sleeve 2 to fix the cable 5 instead of fixing the cable 5 by welding. This can also avoid, to a certain extent, the risk of the outer layer of the cable 5 being damaged in toughness and strength after high-temperature welding, leading to damage to the outer layer.

[0042] In addition, the main body 21 of the accommodating sleeve 2 passes through the side wall of the housing 1, and there is no need to use a knurled metal column, which can avoid the risk of poor intermodulation of signals caused by the knurled metal column.

[0043] In some embodiments, please refer to Figures 4 to 6 In order to facilitate the extrusion structure 32 to exert an extrusion force on the clamping portion 22, the inner diameter of the extrusion structure 32 in this embodiment is designed to be gradually changed. Specifically, in the direction from the clamping portion 22 to the main body 21, the inner diameter of the extrusion structure 32 gradually increases, and is generally a trumpet-shaped structure. Specifically, as Figure 6 The extrusion structure 32 may be an integral structure, the inner surface of which is in the shape of a continuous cone, in which case the inner diameter refers to the radial dimension of the cone, that is, the diameter or radius of the cross section of the cone. The extrusion structure 32 may also be a combined structure consisting of a plurality of extrusion units (such as extrusion strips or extrusion blocks) arranged at intervals, the surface of each extrusion unit facing the internal channel 4 being roughly located within a virtual cone, in which case the inner diameter of the extrusion structure 32 refers to the radial dimension of the virtual cone, that is, the diameter or radius of the cross section of the virtual cone.

[0044] In the above technical solution, the inner diameter of the extrusion structure 32 gradually increases in the direction from the clamping portion 22 to the main body 21. In the process of pushing the fixing sleeve 3 toward the accommodating sleeve 2, the pressure of the extrusion structure 32 on the clamping portion 22 gradually increases. When the fixing sleeve 3 is installed in place, the cable 5 is subjected to the maximum clamping force. At this time, the accommodating sleeve 2, the fixing sleeve 3 and the cable 5 are all fixed in place, which better adapts to the sleeve connection process from loose to tight between the fixing sleeve 3 and the accommodating sleeve 2, and is convenient for real-time fine-tuning of the positions of various components during the assembly process to ensure more accurate and stable assembly.

[0045] In a specific embodiment, Figure 4 As shown, the extrusion structure 32 is a conical structure as a whole, and the inner diameter gradually increases. The end of the clamping part 22 connected to the main body 21 is the connecting end 222, and the end of the clamping part 22 away from the connecting end 222 is the free end 223. In the extruded state, the outer diameter of the clamping part 22 gradually decreases from the connecting end 222 to the free end 223. With such a design, when the extrusion structure 32 and the clamping part 22 are installed in place, the deformation of the free end 223 of the clamping part 22 is the largest in the extension direction of the entire clamping part 22, and the cable 5 is subjected to the maximum clamping force at the free end 223, so that the cable 5 is more stably fixed in the accommodating sleeve 2.

[0046] For other embodiments, please refer to Figure 7 The extrusion structure 32 is an annular protrusion arranged on the inner wall of the socket 31, and the extrusion structure 32 is coaxially arranged with the socket 31. Specifically, the extrusion structure 32 is an annular protrusion, which means that an annular convex ridge structure is constructed on the inner wall of the socket 31, and the height of the entire convex ridge structure relative to the inner wall of the socket 31 is basically the same at all places, so that when the extrusion structure 32 contacts the clamping part 22, it can apply a basically consistent extrusion force to all circumferential parts of the clamping part 22, so that the deformation of all circumferential parts of the clamping part 22 is basically equal, and then the cable 5 is subjected to uniform circumferential force.

[0047] In addition, the extrusion structure 32 is an annular protrusion. Even when the fixing sleeve 3 rotates axially, the extrusion structure 32 can always keep squeezing the clamping portion 22, which can avoid the problem that the cable 5 cannot be compressed when the fixing sleeve 3 rotates to a certain position to a certain extent.

[0048] In some other embodiments, the extrusion structure 32 may be a combination of multiple components, for example, the extrusion structure 32 includes multiple annular protrusions, which are sequentially arranged on the inner wall of the sleeve 31 along the axial direction of the sleeve 31. Alternatively, the extrusion structure 32 includes multiple strip protrusions, which are circumferentially spaced on the inner wall of the sleeve 31. In this case, the clamping portion 22 is preferably a circumferentially continuous structure to ensure that the clamping portion 22 can be continuously extruded by the extrusion structure 32 during the rotation of the fixed sleeve 3.

[0049] In one embodiment, Figures 4 to 5As shown, the clamping part 22 is provided with a guide surface 23 for cooperating with the extrusion structure 32, and the guide surface 23 is located at one end of the clamping part 22 away from the main body 21. Specifically, the installation direction of the fixing sleeve 3 refers to the moving direction of the fixing sleeve 3 during installation, which is generally along the axis of the accommodating sleeve 2, from the clamping part 22 to the main body 21. The inner wall of the extrusion structure 32 forms a conical structure, and the guide surface 23 on the clamping part 22 also has a conical structure accordingly. In the process of fitting the fixing sleeve 3 onto the accommodating sleeve 2, it is convenient for the extrusion structure 32 to be pushed along the guide surface 23 on the clamping part 22 toward the main body 21, so that the clamping part 22 can be smoothly contracted or gathered.

[0050] In some embodiments, the clamping portion 22 is an integrated structure, for example, the clamping portion 22 is an elastic cone structure, and when the extrusion structure 32 is extruded in the axial direction, the cone structure can shrink and deform in the axial direction to clamp the cable 5. In this embodiment, a conical guide surface 23 can also be provided on the clamping portion 22.

[0051] In other embodiments, reference Figure 5 The clamping portion 22 is a combined structure, which includes a plurality of clamping strips 221, which are spaced around the axis 41 of the internal channel 4, and each clamping strip 221 also extends in the direction of the axis 41 of the internal channel 4, and the whole is a clamping claw structure. In this way, the gap between adjacent clamping strips 221 provides a larger space for the deformation of each clamping strip 221, and when the extrusion structure 32 squeezes the clamping portion 22, each clamping strip 221 is more likely to bend and deform in the direction of the axis 41 to grasp the cable 5.

[0052] In the embodiment where the clamping portion 22 includes a plurality of clamping strips 221 , the side surface of each clamping strip 221 facing away from the axis 41 may also be processed to form a guide slope 231 , and the guide slopes 231 on the plurality of clamping strips 221 constitute the entire guide surface 23 of the clamping portion 22 .

[0053] In an embodiment where the clamping portion 22 includes a plurality of clamping strips 221, the extrusion structure 32 is preferably an integrated conical structure, or a circumferentially continuous annular protrusion structure, so as to avoid the problem that when the extrusion structure 32 is configured as a plurality of extrusion strips or extrusion blocks, the extrusion strips or extrusion blocks are embedded between adjacent clamping strips 221, resulting in the clamping portion 22 being unable to be extruded and thus unable to clamp the cable 5.

[0054] In one embodiment, Figure 5 As shown, the main body 21 can be integrally formed with the clamping portion 22 to improve the overall strength of the accommodating sleeve 2 and reduce the risk of the clamping portion 22 being broken due to a loose connection with the main body 21 due to long-term or excessive pressure.

[0055] In one embodiment, Figure 6As shown, the extrusion structure 32 can be integrally formed with the sleeve 31 to improve the overall strength of the fixing sleeve 3 .

[0056] Optionally, the fixing sleeve 3 and the accommodating sleeve 2 are both integrally formed structures.

[0057] In one embodiment, Figures 4 to 6 As shown, the sleeve connector 31 of the fixing sleeve 3 is threadedly connected with the main body 21 of the accommodating sleeve 2. Specifically, an external thread is provided on the outer wall of the main body 21, and an internal thread is provided on the inner wall of the sleeve connector 31, and the external thread and the internal thread are meshed with each other. When installing the fixing sleeve 3, it is only necessary to rotate the fixing sleeve 3 to realize the movement of the fixing sleeve 3 along the axis of the accommodating sleeve 2. During the rotation process, the extrusion structure 32 gradually squeezes the clamping part 22 to make the deformation of the clamping part 22 larger and larger, and finally realizes the clamping and fixing of the cable 5; the fixing sleeve 3 is rotated in the opposite direction to separate the sleeve connector 31 from the main body 21, and the extrusion structure 32 is away from the clamping part 22, so that the clamping part 22 is opened, and the cable 5 can be pulled out. By adopting the threaded connection method for installation, the assembly and disassembly of the cable 5 are more convenient while ensuring that the fixing sleeve 3 is firmly installed.

[0058] In one embodiment, Figure 8 As shown in FIG. 1 , a through hole 11 is provided on the side wall of the housing 1, and the main body 21 of the housing sleeve 2 is detachably arranged inside the through hole 11. Specifically, the through hole 11 is a hole-like structure that is open at both ends of the axial direction and closed circumferentially. By providing the through hole 11 on the side wall of the housing 1, the installation of the housing sleeve 2 is more convenient, and the through hole is a circumferentially closed hole, rather than a circumferentially closed hole. Figure 1 The notch groove in the prior art shown penetrates to the end of the side wall, so it is possible to avoid the problems of inconvenient connection and poor sealing at the notch of the notch groove.

[0059] In some embodiments, the accommodating sleeve 2 further comprises a limiting portion 24 connected to an end of the main body 21 away from the clamping portion 22, the limiting portion 24 abuts against the inner wall of the housing 1, and the sleeve 31 abuts against the outer wall of the housing 1. Figure 4 As shown, the periphery of the limiting portion 24 protrudes relative to the peripheral side surface of the main body 21. When the main body 21 is inserted into the through hole 11, the side surface of the limiting portion 24 close to the main body 21 can abut against the inner wall of the housing 1, and at the same time, the outer end surface of the sleeve 31 of the fixing sleeve 3 can abut against the outer wall of the housing 1. In this way, the side wall of the housing 1 is clamped by the limiting portion 24 and the sleeve 31, so that the accommodating sleeve 2 is fixed on the side wall of the housing 1, making the installation of the accommodating sleeve 2 more secure. At the same time, the through hole 11 can be sealed by the limiting portion 24 and the sleeve 31.

[0060] Further Figure 2As shown, the limiting portion 24 is provided with an operating structure 241, and the operating structure 241 is used to cooperate with an external tool to prevent the receiving sleeve 2 from rotating when the fixing sleeve 3 is mounted on the receiving sleeve 2. Specifically, the operating structure 241 refers to a structure provided outside the limiting portion 24 to cooperate with a wrench, a screwdriver or other tools. The operating structure 241 can be a slot structure such as a hexagonal slot or a slotted slot; the operating structure 241 can also be a plane structure, a concave structure or other surface structures.

[0061] In a preferred embodiment, the operating structure 241 includes a plurality of mounting planes disposed on the outer circumferential surface of the limiting portion 24, the plurality of mounting planes are disposed at intervals around the axis of the limiting portion 24, and the mounting planes are disposed parallel to the axis of the limiting portion 24. When the fixing sleeve 3 is installed, the mounting planes can be clamped by a tool to prevent the accommodating sleeve 2 from rotating with the fixing sleeve 3, making the installation of the fixing sleeve 3 more convenient and quick.

[0062] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for the purpose of explaining the principles of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanation here, any modification, equivalent replacement and improvement made within the spirit and principle of the present invention, that is, other specific implementation methods of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A filter, characterized in that: include: a housing having an inner cavity; A receiving sleeve, comprising a main body portion and a clamping portion connected to each other and defining an internal passage, wherein the internal passage communicates with the inner cavity, and the main body portion penetrates through the side wall of the housing; A fixing sleeve is detachably sleeved on the outer side of the accommodating sleeve, and the fixing sleeve comprises a sleeve connector and an extrusion structure connected to the inner side of the sleeve connector, and the extrusion structure is used to squeeze the clamping portion when the fixing sleeve is sleeved on the accommodating sleeve so that the clamping portion contracts toward the axial direction of the internal channel.

2. The filter according to claim 1, characterized in that Along the direction from the clamping portion to the main body portion, the inner diameter of the extrusion structure gradually increases.

3. The filter according to claim 2, characterized in that The extrusion structure is in a cone shape as a whole.

4. The filter according to claim 1, characterized in that The clamping portion is provided with a guide surface that cooperates with the extrusion structure.

5. The filter according to claim 1, characterized in that The clamping portion and the main body are coaxially arranged and are an integral structure; and / or the sleeve and the extrusion structure are an integral structure.

6. The filter according to any one of claims 1 to 5, characterized in that: The clamping portion includes a plurality of clamping strips, which are distributed at intervals around the axis of the internal channel, and each of the clamping strips extends along the axis direction of the internal channel.

7. The filter according to claim 6, characterized in that A guide slope matched with the extrusion structure is provided on the side of each clamping strip facing away from the inner channel.

8. The filter according to any one of claims 1 to 5, characterized in that: The inner wall of the sleeve connector is threadedly connected to the outer wall of the main body.

9. The filter according to any one of claims 1 to 5, characterized in that: A through hole is arranged on the side wall of the shell, and the main body is detachably arranged inside the through hole.

10. The filter according to claim 9, characterized in that The accommodating sleeve further comprises a limiting portion connected to an end of the main body away from the clamping portion, and the limiting portion and the sleeve connector respectively abut against opposite sides of the side wall of the shell.

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