Filter device and clamping member for locking assembly housing and housing cover

Abstract

The invention discloses a filtering device and a clamping member for locking an assembly shell and a shell cover, the filtering device comprising: an assembly shell, which has an opening and an internal chamber for accommodating a filter element; a shell cover, which cooperates with the assembly shell to close the assembly shell; a locking member, which has a locking arm, and is rotatably connected to the shell cover; a clamping member, the clamping member is used to clamp the assembly shell and the shell cover, and has a clamping shell seat and a positioning rod connected to the clamping shell seat, the positioning rod having a locking groove; the locking arm is engaged with or disengaged from the locking groove by rotating the locking member, so that the assembly shell and the shell cover are switched between a locked state and an unlocked state; the invention rotates the locking member so that the locking arm of the locking member is engaged with or disengaged from the locking groove in the positioning rod of the clamping member, so that the assembly shell and the shell cover are switched between a locked state and an unlocked state, thereby facilitating the installation of the filter element in the assembly shell or taking it out therefrom.

Description

Technical Field

[0001] The present invention relates to the technical field of filter devices, and in particular to an automobile filter device capable of conveniently and reliably realizing the locking and unlocking of an assembly shell and a shell cover, and in particular to a clamping member for locking the assembly shell and the shell cover in the filter device. Background Art

[0002] The filter device is an important component of the automobile system. The automobile filter device generally includes an assembly housing, a filter element contained in the assembly housing for filtering gas and other tiny substances, and a housing cover for sealing the assembly housing and the built-in filter element. Since the filter element in the filter device needs to be replaced regularly, the housing cover needs to be frequently removed or installed on the filter device.

[0003] In the prior art, there are generally two ways to install and fix the shell cover of the filter device:

[0004] 1. Set corresponding screw holes on the shell cover and the assembly shell, and then use screw connection to achieve installation, fixation and disassembly between the shell cover and the assembly shell.

[0005] 2. Corresponding connection mechanisms such as locks are arranged on the shell cover and the filter element to achieve connection, fixation and disassembly between the shell cover and the filter element.

[0006] However, the first method has the disadvantage of laborious and troublesome operation such as screwing screws during installation and removal. As for the second method, it is necessary to set corresponding locks and other plug-ins on the filter element to connect and fix it with the shell cover, which will complicate the structure of the filter element itself and bring more troubles to the production and manufacturing of the filter element. In addition, since the filter material of the filter element is relatively soft compared to the shell cover, when assembling the shell cover and the filter element, in order to ensure accurate installation and avoid damaging the filter element, the operator is often required to be more cautious, which will also cause the problem of inconvenience in the installation and removal of the filter device. Summary of the invention

[0007] In view of the above problems, the present invention provides a filtering device capable of easily locking and unlocking the assembly housing and the housing cover, and a clamping member for locking the assembly housing and the housing cover, so as to make the replacement of the filter element more convenient and reliable.

[0008] The present invention provides a filtering device, comprising:

[0009] an assembly housing having an opening and an interior chamber for accommodating the filter element;

[0010] a housing cover, which cooperates with the assembly housing to close the assembly housing;

[0011] A locking member having a locking arm, wherein the locking member is rotatably connected to the shell cover;

[0012] A clamping member, the clamping member is used to clamp the assembly housing and the housing cover, and has a clamping housing seat and a positioning rod connected to the clamping housing seat, the positioning rod has a locking groove;

[0013] The locking member is rotated to make the locking arm engage with or disengage from the locking groove, so that the assembly housing and the shell cover are switched between a locked state and an unlocked state.

[0014] In the filtering device according to a preferred embodiment of the present invention, the shell cover has a locking hole, the locking component has a locking stem, the locking arm is arranged at the upper end of the locking stem and extends outward in the radial direction of the locking stem, and the locking stem has a protrusion protruding from the side thereof; the locking stem is rotatably arranged in the locking hole and the locking arm and the protrusion are respectively located above and below the shell cover, and the protrusion is engaged with the lower edge of the locking hole.

[0015] In the filtering device according to a preferred embodiment of the present invention, the assembly shell extends laterally at the opening to form a shell opening edge; a locking portion is formed at one end of the shell cover, and the locking hole is formed in the locking portion; the clamping shell seat of the clamping member clamps the shell opening edge of the assembly shell and the locking portion of the shell cover, so that the top shell wall of the clamping shell seat fits the locking portion from above, and the bottom shell wall of the clamping shell seat fits the shell opening edge from below.

[0016] In the filtering device according to a preferred embodiment of the present invention, a sloped rotation guide slope is formed at one end of the positioning rod, and a block-shaped limit block is formed at the other end of the positioning rod, and the rotation guide slope gradually rises in the direction from the outer end side to the locking groove.

[0017] In the filtering device according to a preferred embodiment of the present invention, two positioning rods are formed in the clamping member, and the two positioning rods are arranged in opposite directions to each other, one of the positioning rods is connected to the top shell wall of the clamping shell seat at the lower part of its rotation guide inclined surface, and the other positioning rod is connected to the top shell wall of the clamping shell seat at the lower part of its limit block.

[0018] In the filtering device according to a preferred embodiment of the present invention, the locking member is provided with two locking arms extending outwards in opposite directions.

[0019] In the filtering device according to a preferred embodiment of the present invention, a guide arc surface is provided between the locking groove and the rotation guide inclined surface.

[0020] In the filtering device according to the preferred embodiment of the present invention, the locking core column of the locking member is configured as a tapered structure that gradually tapers from top to bottom.

[0021] In the filtering device according to the preferred embodiment of the present invention, there are more than two protrusions which are evenly arranged on the side surface of the locking core column and protrude obliquely upward.

[0022] In the filtering device according to a preferred embodiment of the present invention, a guide protrusion protrudes downward from the lower surface of the locking arm, and a guide groove is correspondingly formed in the shell cover, and when the locking member is assembled with the shell cover, the guide protrusion can be embedded in the guide groove.

[0023] The present invention also provides a clamping member for locking the assembly shell in the filter device with the shell cover, wherein the clamping member has a clamping shell seat and a positioning rod connected to the clamping shell seat, and the positioning rod has a locking groove that can be engaged or disengaged with a locking member assembled on the shell cover.

[0024] In the clamping structure according to a preferred embodiment of the present invention, a sloped rotation guide slope is formed at one end of the positioning rod, and a block-shaped limit block is formed at the other end of the positioning rod, and the rotation guide slope gradually rises in the direction from the outer end side to the locking groove.

[0025] In the clamping member according to a preferred embodiment of the present invention, two positioning rods are formed in the clamping member, and the two positioning rods are arranged in opposite directions to each other, one of the positioning rods is connected to the top shell wall of the clamping shell seat at the lower part of its rotation guide inclined surface, and the other positioning rod is connected to the top shell wall of the clamping shell seat at the lower part of its limit block.

[0026] In the clamping member according to a preferred embodiment of the present invention, a guide arc surface is provided between the locking groove and the rotation guide inclined surface.

[0027] According to the filter device and the clamping member of the present invention, the locking arm of the locking member can be engaged with or disengaged from the locking groove in the positioning rod of the clamping member by rotating the locking member, that is, the locking and unlocking between the assembly housing and the shell cover can be conveniently and reliably achieved through the engagement or disengagement of the locking arm with the locking groove, thereby facilitating the installation of the filter element in the assembly housing or removing it from the assembly housing. It can be seen that according to the filter device of the present invention, the locking and unlocking between the assembly housing and the shell cover can be achieved only by rotating the locking member, and the operation is simple and convenient, thereby achieving convenient and fast installation and disassembly operations of the filter device. Moreover, the filter device of the present invention avoids the problem of complicated structure of the filter element itself in the prior art, thereby improving the stability of the filter element installation and ensuring the filtering effect of the filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is an assembly stereogram of a filtering device according to a preferred embodiment of the present invention;

[0029] Figure 2 is an assembly top view of a filter device according to a preferred embodiment of the present invention;

[0030] Figure 3 is an exploded perspective view of a filtering device according to a preferred embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of the three-dimensional structure of a clamping member according to a preferred embodiment of the present invention;

[0032] Figure 5 is an assembly diagram of a locking member and a housing cover according to a preferred embodiment of the present invention;

[0033] Figure 6 is another assembly diagram of the locking member and the housing cover according to a preferred embodiment of the present invention;

[0034] Figure 7 is an assembly diagram of a locking member and a clamping member according to a preferred embodiment of the present invention;

[0035] Figure 8 1 is another assembly diagram of the locking member and the clamping member in a preferred embodiment according to the present invention.

[0036] The accompanying drawings are marked as follows:

[0037] 10-locking member 11-locking arm 12-locking stem 13-guide protrusion 14-bump

[0038] 20-clamping member 21-clamping shell seat 22-positioning rod

[0039] 221-locking groove 222-rotation guide inclined surface 223-limiting block 224-guide arc surface

[0040] 30- assembly housing 31- housing opening edge

[0041] 40-shell cover 41-locking part 42-locking hole 43-guide channel DETAILED DESCRIPTION

[0042] In order to make the objectives, technical solutions and advantages of the present invention more clear, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0043] Figure 1 The assembly three-dimensional structure of the filtering device according to the preferred embodiment of the present invention is shown; Figure 2 The top view of the filter device according to the preferred embodiment of the present invention is shown. Figure 3 The exploded three-dimensional structure of the filtering device according to the preferred embodiment of the present invention is shown.

[0044] According to Figure 1-Figure 3 In the preferred embodiment shown, the filtering device of the present invention includes an assembly housing 30 , a filter element (not shown) accommodated in an internal chamber of the assembly housing 30 , a housing cover 40 , a locking member 10 , and a clamping member 20 .

[0045] The assembly housing 30 has an opening and an internal chamber, and a housing opening edge 31 is formed by extending laterally from the opening. Before installing the housing cover 40, the filter element can be installed into the internal chamber of the assembly housing 30 through the opening, and after removing the housing cover 40, the filter element can be taken out from the internal chamber of the assembly housing 30.

[0046] The housing cover 40 can be assembled with the assembly housing 30 to close the opening of the assembly housing 30. Figure 3 As shown, the housing cover 40 is formed with a locking portion 41 at one end thereof. Moreover, a locking hole 42 is formed in the locking portion 41 of the housing cover 40 and passes through the locking portion 41 from top to bottom.

[0047] Further Figure 1-Figure 3 As shown, the lock member 10 has a lock stem 12 extending in the axial direction and a lock arm 11 extending outward in the radial direction and arranged at the upper end of the lock stem 12. Moreover, the lock member 10 can rotate with the lock stem 12 as the axis, and a protrusion 14 is arranged on the side of the lock stem 12.

[0048] Figure 4 FIG. 2 shows a three-dimensional structure of a clamping member according to a preferred embodiment of the present invention. Figure 4 As shown, the clamping member 20 has a clamping shell seat 21 formed with a receiving cavity and a positioning rod 22 extending horizontally from the clamping shell seat 21, and a locking groove 221 is formed in the middle part of the positioning rod 22. The view of the present invention shows that the positioning rod 22 preferably extends horizontally from the top shell wall of the clamping shell seat 21, but the positioning rod 22 can also be selected to extend horizontally from the side shell wall of the clamping shell seat 21 according to the conditions of the assembly shell and the shell cover.

[0049] like Figure 4 As shown, a sloped rotation guide inclined surface 222 is formed at one end of the positioning rod 22, and a block-shaped limit block 223 is formed at the other end of the positioning rod 22. The rotation guide inclined surface 222 gradually rises in a direction from the outer end side to the locking groove 221.

[0050] When the shell cover 40 is assembled to the assembly housing 30, an operation can be performed so that the clamping shell seat 21 of the clamping member 20 can clamp the ends of at least a portion of the assembly housing 30 and the shell cover 40. Figure 1 , Figure 2As shown, when the shell cover 40 is assembled to the assembly shell 30, the top shell wall of the sandwich shell seat 21 can fit the locking portion 41 of the shell cover 40 from above, and the bottom shell wall of the sandwich shell seat 21 can fit the shell opening edge 31 of the assembly shell 30 from below.

[0051] The lock member 10 is rotatably connected to the shell cover 40, that is, the lock member 10 is rotatably arranged on the shell cover 40, so that the lock stem 12 is rotatably arranged in the lock hole 42 of the shell cover 40, the lock arm 11 and the protrusion 14 are respectively located above and below the shell cover 40, and the protrusion 14 on the side of the lock stem 12 is engaged with the lower edge of the lock hole 42 of the shell cover 40. Therefore, the lock arm 11 can be engaged with or disengaged from the locking groove 221 by rotating the lock arm 11.

[0052] According to a specific embodiment, a shell cover 40 having a locking hole 42 can be first manufactured; then a locking component 10 having the locking arm 11 and the locking stem 12 is formed at the locking hole 42 of the shell cover 40 by using a mold through an injection molding process, and the protrusions 14 on the sides of the locking arm 11 and the locking stem 12 are respectively located above and below the shell cover 40.

[0053] According to another specific embodiment, the lock member 10 can be formed of a material that allows elastic deformation. For example, the lock member 10 can be formed of materials such as rubber and plastic. Therefore, the lock stem 12 and the protrusion 14 on the side of the lock stem 12 are formed of a material that allows elastic deformation. After the shell cover 40 with the lock hole 42 is manufactured, the lock member 10 is inserted into the lock hole 42, that is, the lock stem 12 of the lock member 10 and the protrusion 14 on the lock stem 12 are inserted into the lock hole 42 of the shell cover 40, and then the protrusion 14 can be engaged with the lower edge of the lock hole 42 of the shell cover 40.

[0054] When the clamping member 20 moves from the side toward the assembly shell 30 and the shell cover 40 and moves to the clamping position of the assembly shell 30 and the shell cover 40, the locking arm 11 can be rotated so that the locking arm 11 is engaged with the locking groove 221, thereby locking the clamping member 20, and then locking the assembly shell 30 and the shell cover 40 to keep them in a locked state.

[0055] When the locking arm 11 is disengaged from the locking groove 221 by rotating the locking arm 11, the clamping member 20 can be allowed to move laterally outward to a disengaged position from the assembly shell 30 and the shell cover 40, thereby unlocking the assembly shell 30 and the shell cover 40. That is, at this time the shell 30 and the shell cover 40 are in an unlocked state, allowing the shell cover 40 to be removed from the assembly shell 30.

[0056] In summary, the locking member 10 can be rotatably mounted on the shell cover 40 , and the locking member 10 can be switched between a locked state and an unlocked state relative to the clamping member 20 by rotating the locking member 10 , so as to achieve installation and removal of the shell cover 40 and the assembly housing 30 .

[0057] Preferably, the clamping member 20 of the present invention has two positioning rods 22. A locking groove 221 is formed in the middle portion of each positioning rod 22, a ramp-shaped rotation guide inclined surface 222 is formed at one end of each positioning rod 22, and a block-shaped stop block 223 is formed at the other end of the positioning rod 22. In addition, the two positioning rods 22 in the clamping member 20 are arranged in opposite directions to each other. That is, one of the positioning rods 22 is connected to the top shell wall of the clamping shell seat 21 at the lower part of its rotation guide inclined surface 222, and the other positioning rod is connected to the top shell wall of the clamping shell seat 21 at the lower part of its stop block 223.

[0058] Correspondingly, the locking member 10 is preferably symmetrically provided with two locking arms 11, that is, the two locking arms 11 are extended outwardly in radially opposite directions. When the locking member 10 rotates with the locking stem 12 as the axis, the two locking arms 11 extending outwardly in the radial direction rotate with the locking stem 12 as the axis at the same time. Thus, the locking grooves of the two positioning rods 22 of the clamping member 20 can be respectively engaged with the two locking arms 11 of the locking member 10.

[0059] Preferably, a guide arc surface 224 is provided between the locking groove 221 of the positioning rod 22 and the rotation guide inclined surface 222 to guide the locking arm 11 to slide on the positioning rod 22 .

[0060] In the present invention, the locking member 10 , the clamping member 20 , the assembly housing 30 and the housing cover 40 can cooperate with each other to achieve installation and disassembly between the assembly housing 30 and the housing cover 40 .

[0061] like Figure 3 , Figure 5 As shown, the lock stem 12 of the lock member 10 can preferably be set as a tapered structure that tapers from top to bottom. Therefore, if the embodiment of assembling and installing the separate lock member 10 to the shell cover 40 is adopted, the lock stem 12 of the lock member 10 can be more easily installed in the lock hole 42 of the shell cover 40, making the assembly more convenient.

[0062] In addition, if Figure 3 , Figure 6 , Figure 7As shown, a guide protrusion 13 may preferably protrude downward from the lower surface of the lock arm 11, and a guide groove 43 may be correspondingly formed in the locking portion 41 of the shell cover 40. When the lock member 10 is mounted on the shell cover 40, the guide protrusion 13 can be embedded in the guide groove 43 in the locking portion 41 of the shell cover 40, so that the rotation of the lock member 10 relative to the shell cover 40 can be guided.

[0063] In addition, if Figure 3 , Figure 5 As shown, the protrusion 14 on the side of the lock stem 12 of the lock member 10 can be preferably arranged to protrude obliquely upward. When the embodiment of assembling the separate lock member 10 with the shell cover 40 is adopted, on the one hand, after the lock stem 12 is inserted into the lock hole 42 of the shell cover 40, the protrusion 14 of the lock member 10 can more effectively engage the lower edge of the lock hole 42 of the shell cover 40, thereby preventing the lock member 10 from falling off the shell cover 40; on the other hand, when assembling the lock member 10 with the shell cover 40, the protrusion 14 protruding obliquely upward is more conducive to the lock member 10 being installed from the top to the lock hole 42 of the shell cover 40.

[0064] As a preference, the number of the protrusions 14 of the locking member 10 may be more than two and evenly arranged on the side surface of the locking stem 12. Thus, the installation stability of the locking member 10 relative to the housing cover 40 can be further increased.

[0065] When assembling the filter device of the present invention, firstly, the filter element (not shown) is installed into the inner chamber of the assembly housing 30 through the opening of the assembly housing 30, and then the housing cover 40 provided with the locking member 10 is assembled onto the assembly housing 30. At this time, the locking member 10 is installed in the locking hole 42 of the housing cover 40 through the locking stem 12 and can be rotated, and the protrusion 14 of the locking member 10 is engaged with the lower edge of the locking hole 42 of the housing cover 40, so that it can be ensured that the locking member 10 will not fall off from the housing cover 40.

[0066] Then, the clamping member 20 is assembled from the side of the assembled assembly housing 30 and the housing cover 40, so that the clamping shell seat 21 of the clamping member 20 clamps at least a portion of the ends of the assembly housing 30 and the housing cover 40. That is, the top shell wall of the clamping shell seat 21 is attached to the locking portion 41 of the housing cover 40 from above, and the bottom shell wall of the clamping shell seat 21 is attached to the housing opening edge 31 of the assembly housing 30 from below. At this time, the locking arm 11 of the locking member 10 is roughly parallel to the positioning rod 22 of the clamping member 20, that is, the locking member 10 and the clamping member 20 are in the unlocked position.

[0067] Thereafter, the locking member 10 may be rotated approximately 90° (rotating the locking member 10 counterclockwise to, for example, Figure 2 , Figure 8 In the case shown in FIG. 1 , the locking arm 11 of the locking member 10 first slides along the rotation guide inclined surface 222 of the positioning rod 22, and finally fits into the locking groove 221 of the positioning rod 22. At this time, the locking member 10 is in the locking position, so that the shell cover 40 can be locked, thereby maintaining the assembly housing 30 and the shell cover 40 in a locked state, and realizing reliable closure of the filter device.

[0068] When it is necessary to open the shell cover 40 to take out the filter element, the above operation can be performed in reverse.

[0069] The locking member 10 can be rotated approximately 90° in the opposite direction (clockwise rotation of the locking member 10 approximately 90°) so that the locking arm 11 of the locking member 10 is disengaged from the locking groove 221 of the positioning rod, and the locking arm 11 passes through the guide arc surface 224 and slides along the rotation guide inclined surface 222, and finally the locking arm 11 of the locking member 10 is in a position substantially parallel to the positioning rod 22 of the clamping member 20. At this time, the locking member 10 is in the unlocked position, and the operator can remove the clamping member 20, thereby unlocking the assembly housing 30 and the housing cover 40, that is, at this time, the housing 30 and the housing cover 40 are in the unlocked state, which allows the housing cover 40 to be removed from the assembly housing 30, thereby conveniently taking out the filter element for replacement.

[0070] In summary, according to the filter device and the clamping member of the present invention, the locking arm of the locking member can be engaged with or disengaged from the locking groove in the positioning rod of the clamping member by rotating the locking member, that is, the locking and unlocking between the assembly housing and the shell cover can be conveniently and reliably achieved through the engagement or disengagement of the locking arm with the locking groove, thereby facilitating the installation of the filter element in the assembly housing or removing it from the assembly housing. It can be seen that according to the filter device of the present invention, the locking and unlocking between the assembly housing and the shell cover can be achieved only by rotating the locking member, and the operation is simple and convenient, thereby achieving convenient and fast installation and disassembly operations of the filter device. Moreover, according to the filter device of the present invention, the problem of complicated structure of the filter element itself in the prior art is avoided, thereby improving the stability of the filter element installation and ensuring the filtering effect of the filter element.

[0071] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, those skilled in the art should understand that the above specific embodiments are only for illustration and are not intended to limit the scope of the present invention. Those skilled in the art should understand that the above embodiments may be appropriately modified or some technical features may be replaced by equivalents without departing from the technical concept and scope of the present invention.

Claims

1. A filtering device, characterized in that: include: An assembly housing (30) having an opening and an internal chamber for accommodating a filter element; a housing cover (40) which cooperates with the assembly housing (30) to close the assembly housing (30); A locking member (10) having a locking arm (11), wherein the locking member (10) is rotatably connected to the shell cover (40); A clamping member (20), the clamping member (20) being used to clamp the assembly housing (30) and the housing cover (40), and comprising a clamping housing seat (21) and a positioning rod (22) connected to the clamping housing seat (21), the positioning rod (22) having a locking groove (221); The locking member (10) is rotated to engage or disengage the locking arm (11) with the locking groove (221), so that the assembly housing (30) and the shell cover (40) are switched between a locked state and an unlocked state.

2. The filtering device according to claim 1, characterized in that: The shell cover (40) has a lock hole (42), the lock component (10) has a lock stem (12), the lock arm (11) is arranged at the upper end of the lock stem (12) and extends outwardly along the radial direction of the lock stem (12), and the lock stem (12) has a protrusion (14) protruding from the side surface thereof; The lock latch core column (12) is rotatably arranged in the lock hole (42), and the lock latch arm (11) and the protrusion (14) are respectively located above and below the shell cover (40), and the protrusion (14) is engaged with the lower edge of the lock hole (42).

3. The filtering device according to claim 2, characterized in that: The assembly housing (30) extends laterally at the opening to form a housing opening edge (31); A locking portion (41) is formed at one end of the shell cover (40), and the locking hole (42) is formed in the locking portion (41); The clamping shell seat (21) of the clamping member (20) clamps the shell opening edge (31) of the assembly shell (30) and the locking portion (41) of the shell cover (40), so that the top shell wall of the clamping shell seat (21) fits the locking portion (41) from above, and the bottom shell wall of the clamping shell seat (21) fits the shell opening edge (31) from below.

4. The filtering device according to claim 1, characterized in that: A sloped rotation guide inclined surface (222) is formed at one end of the positioning rod (22), and a block-shaped limiting block (223) is formed at the other end of the positioning rod (22), and the rotation guide inclined surface (222) gradually rises in a direction from the outer end side to the locking groove (221).

5. The filtering device according to claim 4, characterized in that: Two positioning rods (22) are formed in the clamping member (20), and the two positioning rods (22) are arranged in opposite directions to each other, one of the positioning rods is connected to the top shell wall of the clamping shell seat (21) at the lower part of its rotation guide inclined surface (222), and the other positioning rod is connected to the top shell wall of the clamping shell seat (21) at the lower part of its limit block (223).

6. The filtering device according to claim 5, characterized in that: The locking component (10) is provided with two locking arms (11) extending outwards in opposite directions.

7. The filtering device according to claim 4, characterized in that: A guide arc surface (224) is provided between the locking groove (221) and the rotation guide inclined surface (222).

8. The filtering device according to claim 2, characterized in that: The locking core column (12) of the locking component (10) is arranged to be a tapered structure that tapers gradually from top to bottom.

9. The filtering device according to claim 2 or 8, characterized in that: There are more than two protrusions (14) which are evenly arranged on the side surface of the lock core column (12) and protrude obliquely upward.

10. The filtering device according to any one of claims 1 to 9, characterized in that: A guide protrusion (13) protrudes downward from the lower surface of the locking arm (11), and a guide groove (43) is correspondingly formed in the shell cover (40). When the locking member (10) and the shell cover (40) are assembled, the guide protrusion (13) can be embedded in the guide groove (43).

11. A clamping member for locking an assembly housing and a housing cover in a filter device, characterized in that: The clamping member (20) comprises a clamping shell seat (21) and a positioning rod (22) connected to the clamping shell seat (21); the positioning rod (22) comprises a locking groove (221) capable of engaging with or disengaging from a locking member assembled on the shell cover.

12. The sandwich member according to claim 11, characterized in that: A sloped rotation guide inclined surface (222) is formed at one end of the positioning rod (22), and a block-shaped limiting block (223) is formed at the other end of the positioning rod (22), and the rotation guide inclined surface (222) gradually rises in a direction from the outer end side to the locking groove (221).

13. The sandwich member according to claim 12, characterized in that: Two positioning rods (22) are formed in the clamping member (20), and the two positioning rods (22) are arranged in opposite directions to each other, one of the positioning rods is connected to the top shell wall of the clamping shell seat (21) at the lower part of its rotation guide inclined surface (222), and the other positioning rod is connected to the top shell wall of the clamping shell seat (21) at the lower part of its limit block (223).

14. The clamping member according to claim 12, characterized in that: A guide arc surface (224) is provided between the locking groove (221) and the rotation guide inclined surface (222).

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