Quick release structure for filter element of air filter

Abstract

The utility model relates to the technical field of automobile parts, in particular to a filter element quick-release structure of an air filter, which comprises a shell, a filter element, a mounting bracket and a cover plate, the filter element is connected to the mounting bracket, the shell is provided with a mounting cavity, the mounting cavity is communicated with the outside, the mounting bracket is embedded in the mounting cavity, and the cover plate is connected to the shell and covers a cavity opening of the mounting cavity. When the filter element is replaced, the filter element can be replaced only by dismounting the cover plate and taking the mounting bracket out of the mounting cavity, so that the influence of the replacement of the filter element on other motorcycle parts is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of automotive parts, and particularly to a quick-release structure for an air filter element. Background Art

[0002] An air filter is one of the essential key components in vehicles such as motorcycles. External air enters the air filter, where dust and water vapor in the air are filtered out, and then the filtered air is sent into the engine to assist in the oil-gas combustion operation. The performance of the air filter is related to many aspects such as the power, economy, and intake noise of the engine.

[0003] Currently, for an air filter, after a certain number of years or when the vehicle has traveled a certain number of kilometers, it is necessary to replace the filter element inside the air filter to ensure the filtering efficiency of the air filter. During the replacement process, it may be necessary to disassemble some motorcycle parts to replace the filter element, and the operation is relatively cumbersome. Utility Model Content

[0004] In order to reduce the operation steps when replacing the filter element, facilitate the replacement of the filter element, and improve the replacement efficiency of the air filter, this application provides a quick-release structure for an air filter element.

[0005] The quick-release structure for an air filter element provided by this application adopts the following technical solutions:

[0006] A quick-release structure for an air filter element includes a housing, a filter element, a mounting bracket, and a cover plate. The filter element is connected to the mounting bracket. The housing is provided with a mounting cavity that communicates with the outside. The mounting bracket is embedded in the mounting cavity, and the cover plate is connected to the housing and covers the opening of the mounting cavity.

[0007] By adopting the above technical solutions, when replacing the filter element, only the cover plate needs to be removed and the mounting bracket needs to be taken out of the mounting cavity, then the replacement of the filter element can be carried out, reducing the impact on other motorcycle parts during the filter element replacement and improving the work efficiency.

[0008] Preferably, it further includes a buckle; several fixing blocks are connected to the side of the cover plate away from the housing; the several fixing blocks are distributed at intervals along the cover plate; the buckle is connected to the housing; the buckle is engaged with the fixing block to realize the connection between the cover plate and the housing; the number of buckles is the same as the number of fixing blocks and they correspond one by one.

[0009] By adopting the above technical solutions, when replacing the filter element, rotate the buckle to make the buckle disengage from the fixing block, then the separation of the cover plate and the housing can be completed. After the replacement is finished, buckle the buckle to the fixing block and rotate the buckle to make the cover plate press tightly against the housing to realize the relative fixation between the cover plate and the housing, simplifying the operations of disassembling and installing the cover plate and improving the work efficiency.

[0010] Preferably, there are two fixing blocks; the two fixing blocks are located on one side of the cover plate; a first clamping block is connected to the other side of the cover plate; a first connecting block is connected to the outer wall of the housing; the first connecting block is provided with a first clamping groove; the first clamping block is embedded in the first clamping groove.

[0011] By adopting the above technical solution, the first clamping block is embedded in the first clamping groove to initially fix the cover plate and the housing, and then the buckle is clamped with the fixing block to fix the cover plate and the housing. While ensuring the connection stability between the cover plate and the housing, the number of buckles is reduced, and the number of buckles that need to be loosened or fastened when replacing the filter element is reduced, improving work efficiency.

[0012] Preferably, there are several first clamping blocks; the several first clamping blocks are distributed at intervals along the distribution direction of the fixing blocks; the number of the first connecting blocks is the same as that of the first clamping blocks and they correspond one by one.

[0013] By adopting the above technical solution, multiple first clamping blocks and first connecting blocks are provided to improve the connection strength between the cover plate and the housing on one side of the first clamping blocks and the first connecting blocks, improve the connection stability between the cover plate and the housing, reduce the possibility of the cover plate falling off during use, and improve the safety of the vehicle.

[0014] Preferably, a receiving groove is provided on the side of the cover plate close to the housing, a first positioning strip is connected to the housing, the first positioning strip is arranged around the notch of the installation groove, the first positioning strip is embedded in the receiving groove, and the outer wall of the first positioning strip is in contact with the groove wall of the receiving groove.

[0015] By adopting the above technical solution, a receiving groove is provided, the first positioning strip is embedded in the receiving groove, and the outer wall of the first positioning strip is in contact with the groove wall of the receiving groove, which is convenient for the first connection hole and the first fixing hole to correspond to each other and convenient for tightening the bolts to connect the cover plate and the housing subsequently.

[0016] Preferably, a first chamfer is provided on the outer periphery of the first positioning strip at the end far from the bottom of the installation cavity, and the first chamfer is used for the groove wall of the receiving groove to abut against.

[0017] By adopting the above technical solution, a first chamfer is provided on the outer periphery of the first positioning strip at the end far from the bottom of the installation groove, and the first chamfer plays a guiding role in the installation of the cover plate, which is convenient for the first positioning strip to be embedded in the receiving groove and improves the installation efficiency.

[0018] Preferably, a lifting plate is connected to the side of the installation bracket close to the cover plate, there is a gap between the surface of the lifting plate far from the installation bracket and the cavity wall of the installation cavity, and a convex strip is connected to the side of the lifting plate far from the cover plate.

[0019] By adopting the above technical solution, the lifting plate and the convex strip are provided, which facilitates the user to extend the finger to the side of the lifting plate away from the cover plate, and the finger buckles the convex strip, which helps to pull out the mounting bracket from the mounting cavity.

[0020] Preferably, a third positioning strip is connected to the side of the cover plate close to the bottom of the mounting cavity; one end of the mounting bracket away from the cover plate abuts against the bottom of the mounting cavity; the other end of the mounting bracket abuts against the surface of the side of the cover plate close to the bottom of the mounting cavity; a butting groove is provided at one end of the mounting bracket close to the cover plate; the third positioning strip is embedded in the butting groove; the outer wall of the third positioning strip fits with the groove wall of the butting groove.

[0021] By adopting the above technical solution, one end of the mounting bracket abuts against the bottom of the mounting cavity, and the other end of the mounting bracket abuts against the cover plate, realizing the relative fixation of the mounting bracket and the housing along the length direction of the mounting bracket. The cover plate is provided with a third positioning strip, and the outer wall of the third positioning strip fits with the groove wall of the butting groove, realizing the relative fixation of the cover plate and the mounting bracket perpendicular to the length direction of the mounting bracket, reducing the possibility of the mounting bracket moving during use, and improving the filtering efficiency of the cavity filter.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. When replacing the filter element, only the cover plate needs to be removed and the mounting bracket is taken out of the mounting cavity, then the filter element can be replaced, reducing the impact on other motorcycle parts when replacing the filter element and improving the work efficiency;

[0024] 2. The first clamping block is embedded in the first clamping groove to realize the preliminary fixation of the cover plate and the housing, and then the buckle is clamped with the fixing block to realize the fixation of the cover plate and the housing. While ensuring the connection stability between the cover plate and the housing, the number of buckles is reduced, and the number of buckles that need to be loosened or buckled when replacing the filter element is reduced, improving the work efficiency;

[0025] 3. One end of the mounting bracket abuts against the bottom of the mounting cavity, and the other end of the mounting bracket abuts against the cover plate, realizing the relative fixation of the mounting bracket and the housing along the length direction of the mounting bracket. The cover plate is provided with a third positioning strip, and the outer wall of the third positioning strip fits with the groove wall of the butting groove, realizing the relative fixation of the cover plate and the mounting bracket perpendicular to the length direction of the mounting bracket, reducing the possibility of the mounting bracket moving during use, and improving the filtering efficiency of the cavity filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of a quick-release structure of an air filter element.

[0027] Figure 2 It is an exploded structural diagram of the housing.

[0028] Figure 3This is a schematic diagram of the explosion structure of the shell from another perspective.

[0029] Figure 4 It is a cross-sectional view of the quick-release structure of the air filter element.

[0030] Figure 5 It is a schematic diagram of the partial explosion structure of the air filter element quick-release structure.

[0031] Figure 6 It is a schematic diagram of the exploded structure of the filter component.

[0032] Figure 7 yes Figure 4 Enlarged view of point A in the middle.

[0033] Figure 8 It is a structural diagram of the cover.

[0034] Description of reference numerals:

[0035] 1. Shell; 11. Mounting cavity; 12. Mounting seat; 121. First positioning strip; 1211. First chamfer; 122. First connecting block; 1221. First clamping slot; 123. Rotating seat; 13. Upper shell; 131. Upper connecting ring; 132. Positioning slot; 133. Second fixing hole; 134. Second connecting block; 1341. Second clamping slot; 135. Third fixing hole; 136. Connecting column; 14. Lower shell; 141. Lower connecting ring; 142. Second positioning strip; 143. Avoidance slot; 144. Second connecting hole; 145. Second clamping block; 146. Third connecting block; 1461. Third connecting hole; 15. Cavity; 16. Connecting channel; 17. Rotating slot;

[0036] 2. Filter assembly; 21. Mounting bracket; 211. Body; 2111. Embedding groove; 2112. Mounting groove; 2114. Abutment groove; 212. Lifting plate; 213. Raised strip; 214. Abutment block; 22. Filter element; 221. Limiting ring; 222. Abutment ring;

[0037] 3. Cover plate; 32. Accommodating groove; 33. First clamping block; 36. Third positioning strip; 37. Fixing block;

[0038] 4. Buckle; 41. Hanging ring; 42. Lock tongue seat. DETAILED DESCRIPTION

[0039] The present application is further described in detail below in conjunction with the accompanying drawings.

[0040] Reference Figure 1, an embodiment of the present application discloses a quick-release structure for an air filter element, which includes a housing 1. The housing 1 includes an upper housing 13 and a lower housing 14. An upper connecting ring 131 is fixedly connected to the outer periphery of one end of the upper housing 13 close to the lower housing 14, and a lower connecting ring 141 is fixedly connected to the outer periphery of one end of the lower housing 14 close to the upper housing 13. The upper connecting ring 131 is in contact with the lower connecting ring 141.

[0041] Referring to Figure 2 and Figure 3 , on one side of the lower connecting ring 141 close to the upper housing 13, a second positioning strip 142 is fixedly connected. The second positioning strip 142 extends along the circumferential direction of the lower housing 14. A positioning groove 132 is provided on one side of the upper connecting ring 131 close to the lower housing 14, and the positioning groove 132 is used for the positioning strip to be inserted. The lower housing 14 is provided with a plurality of avoidance grooves 143. A second connecting hole 144 is coaxially provided at the bottom of the avoidance groove 143. The second connecting hole 144 is located outside the lower connecting ring 141, and the plurality of second connecting holes 144 are circumferentially spaced along the lower housing 14. In this embodiment, there are six second connecting holes 144, and the six second connecting holes 144 are divided into two groups, and the two groups of second connecting holes 144 are symmetrically distributed along the width direction of the lower housing 14. A connecting column 136 is fixedly connected to one side of the upper housing 13 away from the lower housing 14. The axis of the connecting column 136 coincides with the axis of the second connecting hole 144, and the number of the connecting columns 136 is the same as the number of the second connecting holes 144 and they correspond one by one. A second fixing hole 133 is coaxially provided at one end of the connecting column 136 away from the lower housing 14. The second fixing hole 133 penetrates through the upper housing 13 along the axial direction of the second fixing hole 133. The second connecting hole 144 is used for a bolt to pass through and be threadedly connected with the second fixing hole 133.

[0042] On the outer wall of one side of the lower connecting ring 141 along the length direction of the lower housing 14, a second clamping block 145 is fixedly connected. On the outer wall of one side of the upper connecting ring 131 close to the second clamping block 145, a second connecting block 134 is fixedly connected. The second connecting block 134 is provided with a second clamping groove 1341, and the second clamping groove 1341 is used for the second clamping block 145 to be inserted. On the outer wall of one side of the lower connecting ring 141 close to the second clamping block 145, a third connecting block 146 is fixedly connected. The surface of one side of the third connecting block 146 close to the lower connecting ring 141 is in contact with the outer wall of the upper connecting ring 131. In this embodiment, there are two third connecting blocks 146, and the two third connecting blocks 146 are symmetrically distributed along the width direction of the lower housing 14. The third connecting block 146 is provided with a third connecting hole 1461, and a third fixing hole 135 is provided on the outer wall of the upper connecting ring 131. The number of the third fixing holes 135 is the same as the number of the third connecting holes 1461 and they correspond one by one. The third connecting hole 1461 is used for a bolt to pass through and be threadedly connected with the third fixing hole 135.

[0043] Referring to Figure 1 and Figure 4, the housing 1 further includes a mounting base 12. One end of the mounting base 12 is fixedly connected to the surface of the upper shell 13 away from the lower shell 14. The mounting base 12 is located on one side of the housing 1 close to the second connecting block 134, and the upper end of the mounting base 12 is inclined towards the side close to the second connecting block 134. An installation cavity 11 is provided at the end of the mounting base 12 away from the housing 1, and the bottom of the installation cavity 11 is located within the lower shell 14. The housing 1 is provided with a cavity 15, which is located on the side of the housing 1 away from the second connecting block 134. A connecting channel 16 is provided at the cavity wall on the side of the installation cavity 11 close to the cavity 15, and the connecting channel 16 communicates with the cavity 15.

[0044] Referring to Figure 4 and Figure 5 , a quick-release structure for an air filter element further includes a filtering component 2, and the filtering component 2 includes a mounting bracket 21 and a filter element 22. The mounting bracket 21 includes a body 211, and the body 211 is embedded in the installation cavity 11. The side walls of the body 211 along both sides in the width direction of the upper shell 13 are in contact with the cavity wall of the installation cavity 11.

[0045] Referring to Figure 6 and Figure 7 , an embedding groove 2111 is provided on the side of the body 211 close to the cavity 15. The embedding groove 2111 runs through the body 211 along the length direction of the body 211, and a mounting groove 2112 is provided at the bottom of the embedding groove 2111. The mounting groove 2112 runs through the body 211 along the thickness direction of the body 211. The filter element 22 is embedded in the mounting groove 2112. A limiting ring 221 is fixedly connected to the outer periphery of one end of the filter element 22 close to the cavity 15. The surface of the limiting ring 221 away from the cavity 15 abuts against the bottom of the embedding groove 2111. A butting ring 222 is fixedly connected to the surface of the limiting ring 221 close to the cavity 15. The distance from the butting ring 222 to the bottom of the embedding groove 2111 is greater than the distance from the surface of the body 211 close to the cavity 15 to the bottom of the embedding groove 2111. The surface of the butting ring 222 away from the limiting ring 221 abuts against the cavity wall on the side of the installation cavity 11 close to the cavity 15, and the connecting channel 16 is located inside the butting ring 222.

[0046] Referring to Figure 4 and Figure 6 , a rotating groove 17 is provided at the bottom of the installation cavity 11. One end of the body 211 close to the bottom of the installation cavity 11 is fixedly connected with a butting block 214. The butting block 214 is rotatably embedded in the rotating groove 17, and the rotation axis of the butting block 214 is parallel to the width direction of the lower shell 14. In this embodiment, when the butting ring 222 abuts tightly against the cavity wall of the installation cavity 11, the surface of the butting block 214 away from the cavity 15 abuts against the groove wall of the rotating groove 17 away from the cavity 15.

[0047] Referring to Figure 7, at one end of the body 211 away from the bottom of the installation cavity 11, there is an abutting groove 2114, and one side of the abutting groove 2114 away from the cavity 15 penetrates through the body 211. On the side of the mounting bracket 21 away from the embedding groove 2111, a lifting plate 212 is fixedly connected. The surface of the lifting plate 212 away from the bottom of the installation cavity 11 is flush with the bottom of the abutting groove 2114, and there is a gap between the surface of the lifting plate 212 away from the mounting bracket 21 and the cavity wall on the side of the installation cavity 11 away from the cavity 15. On the surface of the lifting plate 212 close to the bottom of the installation cavity 11, a convex strip 213 is fixedly connected. The convex strip 213 extends circumferentially along the lifting plate 212, and the outer wall of the convex strip 213 is flush with the side wall of the lifting plate 212.

[0048] Referring to Figure 1 and Figure 4 , a quick-release structure for an air filter element further includes a cover plate 3, and the cover plate 3 is connected to the mounting base 12 and covers the opening of the installation cavity 11.

[0049] Referring to Figure 4 and Figure 5 , on the side of the cover plate 3 close to the mounting base 12, there is a receiving groove 32. At one end of the mounting base 12 away from the upper shell 13, a first positioning strip 121 is fixedly connected. The first positioning strip 121 is arranged around the opening of the mounting groove 2112. On the outer periphery of one end of the first positioning strip 121 away from the mounting base 12, there is a first chamfer 1211 for the wall of the receiving groove 32 to abut against. The first positioning strip 121 is embedded in the receiving groove 32, and the outer wall of the first positioning strip 121 fits against the wall of the receiving groove 32.

[0050] Referring to Figure 4 and Figure 7 , one end of the body 211 abuts against the bottom of the installation cavity 11, and the other end of the body 211 abuts against the bottom of the receiving groove 32.

[0051] Referring to Figure 4 and Figure 8 , a third positioning strip 36 is fixedly connected to the bottom of the receiving groove 32. The third positioning strip 36 is annular, and the outer wall of the third positioning strip 36 fits against the wall of the abutting groove 2114.

[0052] Referring to Figure 4 and Figure 5 , on the outer wall of the cover plate 3 on the side away from the second connecting block 134, a plurality of first clamping blocks 33 are fixedly connected. The plurality of first clamping blocks 33 are spaced apart along the width direction of the upper shell 13. In this embodiment, there are two first clamping blocks 33, and the two first clamping blocks 33 are symmetrically distributed along the width direction of the upper shell 13. On the outer wall of the mounting base 12 on the side close to the first clamping block 33, a first connecting block 122 is fixedly connected. The number of the first connecting blocks 122 is the same as that of the first clamping blocks 33 and they correspond one by one. The first connecting block 122 is provided with a first clamping groove 1221. The first clamping block 33 is embedded in the first clamping groove 1221.

[0053] Reference Figure 1 Figure 1 , a quick-release structure for an air filter element further includes a buckle 4. A fixing block 37 is fixedly connected to the side of the cover plate 3 away from the mounting seat. The fixing block 37 is located on the side of the cover plate 3 away from the first clamping block 33. There are several fixing blocks 37, and the several fixing blocks 37 are spaced apart along the width direction of the upper shell 13. In this embodiment, there are two fixing blocks 37, and the two fixing blocks 37 are symmetrically distributed along the width direction of the upper shell 13. The number of buckles 4 is the same as the number of fixing blocks 37 and they correspond one by one. The buckle 4 is connected to the mounting seat 12, and the buckle 4 is clamped with the fixing block 37 to realize the connection between the cover plate 3 and the mounting seat 12. The buckle 4 includes a hanging ring 41 and a lock tongue seat 42. A rotating seat 123 is fixedly connected to the side of the mounting seat 12 away from the first connecting block 122. The number of rotating seats 123 is the same as the number of fixing blocks 37 and they correspond one by one. One end of the lock tongue seat 42 is rotatably connected to the rotating seat 123. The rotation axis of the lock tongue seat 42 is parallel to the width direction of the upper shell 13. One end of the hanging ring 41 is rotatably connected to the lock tongue seat 42, and the other end of the hanging ring 41 is used for sleeving around the outer periphery of the fixing block 37.

[0054] The implementation principle of the quick-release structure for an air filter element in an embodiment of the present application is as follows: When the filter element 22 needs to be replaced, loosen the two buckles 4, and use a finger to hold the fixing block 37 and slide the cover plate 3 in the direction away from the first connecting block 122, so that the first clamping block 33 disengages from the first clamping groove 1221, and then remove the cover plate 3.

[0055] Insert a finger between the lifting plate 212 and the wall of the installation cavity 11 to the side of the lifting plate 212 close to the bottom of the installation cavity 11, and then use the finger to clasp the surface of the convex strip 213 close to the cavity 15, and pull the installation bracket 21 to rotate around the contact point between the abutting block 214 and the wall of the rotating groove 17, and pull the installation bracket 21 out of the installation cavity 11.

[0056] After the replacement of the filter element 22 is completed, insert the installation bracket 21 into the installation cavity 11 so that the abutting block 214 is in the rotating groove 17, rotate the installation bracket 21 so that the abutting ring 222 abuts tightly against the wall of the installation cavity 11, and the surface of the abutting block 214 away from the cavity 15 fits against the wall of the rotating groove 17. Insert the first clamping block 33 into the first clamping groove 1221, rotate the cover plate 3, and the wall of the receiving groove 32 abuts against the first chamfer 1211. Sleeve the hanging ring 41 around the outer periphery of the fixing block 37, and rotate the lock tongue seat 42 so that the lock tongue seat 42 abuts against the outer wall of the mounting seat 12 to realize the relative fixation between the cover plate 3 and the housing 1. The third positioning strip 36 abuts against the wall of the abutting groove 2114, so that the abutting ring 222 abuts tightly against the wall of the installation cavity 11, and the receiving groove 32 abuts against the end of the installation bracket 21 away from the installation cavity 11, so that the other end of the installation bracket 21 abuts tightly against the bottom of the installation cavity 11 to realize the relative fixation between the installation bracket 21 and the housing 1.

[0057] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. An air filter element quick-release structure, characterized in that: The invention comprises a housing (1), a filter element (22), a mounting bracket (21) and a cover plate (3); the filter element (22) is connected to the mounting bracket (21); the housing (1) is provided with a mounting cavity (11); the mounting cavity (11) is connected to the outside; the mounting bracket (21) is embedded in the mounting cavity (11); and the cover plate (3) is connected to the housing (1) and covers the cavity opening of the mounting cavity (11).

2. The air filter element quick-release structure according to claim 1, characterized in that: It also comprises a buckle (4); a plurality of fixing blocks (37) are connected to a side of the cover plate (3) away from the shell (1); the fixing blocks (37) are spaced apart along the cover plate (3); the buckle (4) is connected to the shell (1); the buckle (4) and the fixing blocks (37) are engaged to achieve connection between the cover plate (3) and the shell (1); the number of the buckles (4) is the same as the number of the fixing blocks (37) and corresponds one to one.

3. The air filter element quick-release structure according to claim 2, characterized in that: Two fixing blocks (37) are provided; the two fixing blocks (37) are located on one side of the cover plate (3); the other side of the cover plate (3) is connected to a first clamping block (33); the outer wall of the shell (1) is connected to a first connecting block (122); the first connecting block (122) is provided with a first clamping slot (1221); and the first clamping block (33) is embedded in the first clamping slot (1221).

4. The air filter element quick-release structure according to claim 3, characterized in that: A plurality of the first card blocks (33) are provided; the plurality of the first card blocks (33) are distributed at intervals along the distribution direction of the fixed block (37); and the number of the first connection blocks (122) is the same as the number of the first card blocks (33) and corresponds one to one.

5. The air filter element quick-release structure according to claim 2, characterized in that: A receiving groove (32) is provided on a side of the cover plate (3) close to the shell (1); the shell (1) is connected to a first positioning strip (121); the first positioning strip (121) is arranged around a notch of the installation groove (2112); the first positioning strip (121) is embedded in the receiving groove (32); and the outer wall of the first positioning strip (121) is in contact with the groove wall of the receiving groove (32).

6. The air filter element quick-release structure according to claim 5, characterized in that: A first chamfer (1211) is provided on the outer periphery of one end of the first positioning strip (121) away from the bottom of the installation cavity (11); the first chamfer (1211) is used for abutting against the wall of the accommodating groove (32).

7. The air filter element quick-release structure according to claim 1, characterized in that: A lifting plate (212) is connected to a side of the mounting bracket (21) close to the cover plate (3); a gap exists between a surface of a side of the lifting plate (212) away from the mounting bracket (21) and a cavity wall of the mounting cavity (11); and a convex strip (213) is connected to a side of the lifting plate (212) away from the cover plate (3).

8. The air filter element quick-release structure according to claim 1, characterized in that: A third positioning strip (36) is connected to a side of the cover plate (3) close to the bottom of the installation cavity (11); an end of the installation bracket (21) away from the cover plate (3) abuts against the bottom of the installation cavity (11); the other end of the installation bracket (21) abuts against a surface of a side of the cover plate (3) close to the bottom of the installation cavity (11); an abutting groove (2114) is provided at one end of the installation bracket (21) close to the cover plate (3); the third positioning strip (36) is embedded in the abutting groove (2114); and an outer wall of the third positioning strip (36) is in contact with a groove wall of the abutting groove (2114).

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