A dust collection base station
Patent Information
- Application Number
- CN202522368031.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-07
- Publication Date
- 2026-09-29
- Estimated Expiration
- 2035-11-07
AI Technical Summary
这种消音结构,仅适用于低功率的风机,但低功率的风机,其吸力较小,会导致集尘效果较差;而使用功率较大的风机时,噪音也会同步增大
1、本实用新型中在风机上罩中设置进风旋叶组,气流在从进尘口进入并经过尘仓后,会再次经过进风旋叶组的导流,使得气流的方向与风机本体叶轮转动产生的气流方向一致,能降低风机本体的叶轮与气流摩擦产生的噪音;
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Figure CN224806438U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of dust collection technology for vacuum cleaners, and in particular to a dust collection base station. Background Technology
[0002] With the rapid development and maturation of intelligent cleaning technology, the application of intelligent cleaning robots is becoming increasingly widespread. Simultaneously, in order to enhance the user experience, research into related base station equipment used in conjunction with cleaning robots is receiving increasing attention.
[0003] Currently, base stations with dust collection functions typically use a fan to draw air from the dust collection chamber, creating negative pressure to collect dust. However, the fan generates considerable noise during operation, impacting user experience. Current methods generally involve installing a soundproof cover on the fan and filling it with sound-absorbing cotton to reduce noise. This noise reduction structure is only suitable for low-power fans, but low-power fans have weaker suction, resulting in poor dust collection efficiency; conversely, using higher-power fans increases noise levels. Utility Model Content
[0004] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide a dust collection base station that can reduce the noise generated by the fan during the dust collection process and improve the noise reduction effect.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a dust collection base station, including a base station body and a noise reduction mechanism; the base station body is provided with a dust inlet, a dust bin, and a fan assembly arranged sequentially from top to bottom. The fan assembly includes a fan cover and a fan body located inside it. The fan cover includes an upper fan cover and a lower fan cover that are detachably connected. The upper fan cover is arranged vertically and has a first end and a second end. A noise reduction mechanism is provided in the first end. The noise reduction mechanism includes a horizontally arranged air inlet swirl vane group. The airflow direction of the blades in the air inlet swirl vane group is consistent with the airflow direction when the impeller of the fan body rotates. The second end can extend into the lower fan cover, and its outer wall is at least partially spaced from the inner wall of the lower fan cover. The bottom of the base station body is provided with several base station exhaust holes. The gas entering the fan cover from the dust inlet can flow through the gaps into the base station body and be discharged from the base station body through the airflow channel formed between the inner wall of the base station body and the outer wall of the lower fan cover, which is connected to the base station exhaust holes.
[0006] Furthermore, the inlet vortex assembly includes a central fixed column and several blades arranged in a ring along its outer wall. The end of each blade away from the central fixed column is obliquely fixed to the inner wall of the fan shroud. The tilt direction of each blade is consistent, and the airflow in the dust bin is obliquely introduced into the fan shroud through the inlet vortex assembly. Moreover, its guiding direction is consistent with the airflow direction generated when the fan impeller rotates, thus avoiding frictional noise between the impeller and the airflow entering the fan shroud.
[0007] Furthermore, the fan cover includes an integrally formed upper part, middle part, and lower part. The upper part is screwed to the bottom of the dust chamber. The air inlet vortex assembly is located in the middle part of the cover. The gap between the outer periphery of the lower part of the cover and the inner wall of the lower fan cover is filled with sound-absorbing cotton. The sound-absorbing cotton effectively reduces the energy of sound wave vibrations and lowers noise.
[0008] Furthermore, an upper shock-absorbing pad is provided at the junction of the lower interior of the cover and the middle part of the cover, and a lower shock-absorbing pad is provided at the bottom of the lower cover of the fan. The installation of the upper and lower shock-absorbing pads can further and effectively reduce the noise caused by vibration during the operation of the fan body.
[0009] Furthermore, the bottom of the dust chamber is hollowed out and an anti-clogging component is provided on it. The anti-clogging component includes an anti-clogging bracket that matches the internal size of the dust chamber. The anti-clogging bracket is hollowed out and there is an installation space between its lower surface and the bottom of the dust chamber for the sound-absorbing cotton to be accommodated. The upper surface of the anti-clogging bracket is provided with several support protrusions extending toward the dust inlet.
[0010] The dust chamber is designed to hold a removable dust bag. The open design at the bottom of the dust chamber allows airflow entering from the dust inlet to enter the fan. The negative pressure airflow generated by the fan draws dust and debris from the dust cup into the dust bag. As the dust and debris accumulate in the dust bag, it will fall downwards. The anti-clogging bracket provides good support for the bottom of the dust bag, preventing it from falling and clogging the open air inlet at the bottom of the dust chamber.
[0011] Furthermore, the dust chamber is equipped with a sterilization component, which includes a dust-blocking plate embedded in the bottom of the dust chamber, with a UV lamp positioned below the dust-blocking plate. The dust-blocking plate is made of transparent material. During the use of the dust collection station, bacteria inevitably grow in the dust bags. Adding a UV lamp inside the dust chamber can effectively reduce bacterial growth within the dust bags.
[0012] Furthermore, an ambient lighting assembly is installed at the bottom of the base station body. This assembly includes an electronically controlled light panel and a light guide strip. The electronically controlled light panel is horizontally positioned within the base station body, and the light guide strip is embedded in the bottom surface of the base station body and connected to the electronically controlled light panel with screws. The light guide strip effectively enhances the aesthetics of the dust-collecting base station and prevents users from bumping into it in dimly lit indoor environments, thus improving the user experience.
[0013] Furthermore, it also includes a base station base detachably connected to the bottom of the base station body. The base station base is hollow inside, and its outer wall is provided with at least one elastic buckle that can tilt inward. The bottom of the base station body has a buckle groove that can engage with the elastic buckle. The base station base not only supports the placement of the base station body, ensuring its stability and reliability and preventing the base station body from being placed directly on the ground and causing blockage of its bottom ventilation holes, but also effectively reduces the size of the product packaging box and lowers transportation costs.
[0014] Furthermore, the base station body has a guide groove recessed at its bottom facing inwards, and a buckle groove is formed on the groove wall of the guide groove. A positioning boss is provided in the guide groove protruding away from the base station body. A limited space is formed between the periphery of the positioning boss and the inner wall of the guide groove for the top of the base station base to be inserted. A connecting groove matching the positioning boss is formed on the upper surface of the base station base. When the upper surface of the base station base abuts against the top of the guide groove, the elastic buckle is engaged with the buckle groove.
[0015] Furthermore, the positioning boss has a positioning protrusion and at least one pressing protrusion extending outward from its side, and the connecting groove has a positioning groove that matches the positioning protrusion extending outward from its outer periphery.
[0016] The beneficial effects of this utility model are: 1. In this utility model, an air inlet vortex assembly is set in the upper cover of the fan. After the airflow enters from the dust inlet and passes through the dust bin, it will pass through the air inlet vortex assembly again, so that the direction of the airflow is consistent with the direction of the airflow generated by the rotation of the impeller of the fan body, which can reduce the noise generated by the friction between the impeller of the fan body and the airflow. 2. In this utility model, the travel distance of the exhaust air from the fan body to the base station exhaust port at the bottom of the base station body is increased. After the airflow enters the lower fan cover from the upper fan cover, it flows upward through the gap between the upper and lower fan covers into the airflow channel, and then flows downward through the airflow channel until it is discharged from the base station exhaust port, which effectively reduces the high-frequency noise of the fan. Attached Figure Description
[0017] Figure 1 This is an axonometric view of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic cross-sectional view of the overall structure of an embodiment of the present utility model; Figure 3 This is a schematic cross-sectional view of the overall structure of a fan assembly according to an embodiment of the present invention; Figure 4 This is an isometric view of the overall structure of the fan cover according to an embodiment of the present invention; Figure 5 This is an axonometric view of the overall structure of the dust bin according to an embodiment of the present invention; Figure 6 This is an axonometric view of the overall structure of the dust bin according to another embodiment of the present invention; Figure 7 This is an axonometric view of the overall structure of a base station base according to an embodiment of the present invention; Figure 8 This is an axonometric view of the base station body structure according to an embodiment of the present invention; In the diagram: 1. Base station body; 2. Base station base; 3. Dust inlet; 4. Dust bin; 5. Noise reduction mechanism; 51. Fan upper cover; 52. Fan lower cover; 53. Air inlet swirl assembly; 54. Sound-absorbing cotton one; 6. Fan body; 7. Upper vibration damping pad; 8. Lower vibration damping pad; 9. Sound-absorbing cotton two; 10. Base station exhaust port; 11. Sound-absorbing cotton three; 12. Sterilization component; 121. Dust baffle; 13. Light guide strip; 14. Electrically controlled light panel; 15. Anti-clogging component; 151. Anti-clogging bracket; 152. Support protrusion; 16. Pressing protrusion; 17. Positioning protrusion; 18. Elastic buckle; 19. Buckle groove; 20. Positioning boss; 21. Guide groove; 22. Connecting groove. Detailed Implementation
[0018] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.
[0019] See appendix Figures 1 to 8 As shown, a dust collection base station in this embodiment includes a base station body 1 and a noise reduction mechanism 5. The base station body 1 is provided with a dust inlet 3, a dust chamber 4 and a fan assembly connected sequentially from top to bottom. The dust inlet 3 is connected to the dust removal port of the dust cup of a vacuum cleaner. When the base station body 1 is started, the negative pressure airflow generated by the fan assembly can draw the dust in the dust cup into the dust bag in the dust chamber 4. The fan assembly includes a fan shroud and a fan body 6 located therein. The fan shroud includes an upper fan cover 51 and a lower fan cover 52 that are detachably connected. The upper fan cover 51 is vertically continuous and has a first end and a second end. A noise reduction mechanism 5 is provided in the first end. The noise reduction mechanism 5 includes a horizontally arranged air inlet swirl vane group 53. The airflow direction of the blades in the air inlet swirl vane group 53 is consistent with the airflow direction when the impeller of the fan body 6 rotates. The second end can extend into the lower fan cover 52, and its outer wall is at least partially spaced from the inner wall of the lower fan cover 52. The bottom of the base station body 1 is provided with several base station exhaust holes 10. The gas entering the fan shroud from the dust inlet 3 can flow through the gaps into the base station body 1 and be discharged from the base station body 1 through the airflow channel formed between the inner wall of the base station body 1 and the outer wall of the lower fan cover 52, which is connected to the base station exhaust holes 10.
[0020] Compared to the prior art where the airflow entering from the dust inlet 3 passes vertically through the dust bin 4 and the fan body 6 and is discharged from the bottom of the base station body 1, in this application, the airflow entering the base station body 1 from the dust inlet 3 passes through the dust bin 4 and is guided by the air inlet swivel group 53, so that the direction of the airflow is consistent with the direction of the airflow generated by the rotation of the impeller of the fan body 6, thus initially reducing the noise generated by the friction between the impeller of the fan body 6 and the airflow. In some embodiments, see Appendix Figure 2 After the airflow enters the lower cover 52 of the fan, it flows upward through the gap between the upper cover 51 and the lower cover 52 of the fan to the airflow channel, and flows downward under the guidance of the airflow channel and is discharged through the base station exhaust port 10 at the bottom of the base station body 1. This increases the travel distance of the airflow between the fan assembly and the base station exhaust port 10, thereby increasing the airflow discharge path. The high-frequency noise generated by the operation of the fan body 6 is further effectively reduced and absorbed during the airflow discharge, resulting in better noise reduction effect.
[0021] Figure 2 The direction indicated by the middle arrow is the flow direction of the airflow after it enters the base station body 1 from the dust inlet 3.
[0022] The addition of the air inlet swirl assembly 53 and the increased airflow exhaust stroke allows the dust collection base station to be used without being limited to a small-power fan body 6, thus increasing its applicability.
[0023] In some embodiments, the outer diameter of the upper fan cover 51 is smaller than the outer diameter of the lower fan cover 52. The outer wall of the upper fan cover 51 is provided with a plurality of nut seats at intervals, and the inner wall of the lower fan cover 52 is provided with a plurality of connecting seats corresponding to the positions of the nut seats. After the fan body 6 is placed inside the lower fan cover 52, the upper fan cover 51 extends into the lower fan cover 52, completely covering the fan body 6. The locking screws are inserted into the nut seats and connecting seats respectively to lock them, thus completing the installation of the upper fan cover 51, the lower fan cover 52 and the fan body 6.
[0024] The inlet swirl vane assembly 53 includes a central fixed column and several blades arranged in a ring along its outer wall. The ends of the blades away from the central fixed column are obliquely fixed to the inner wall of the fan shroud 51. The tilt direction of each blade is consistent. The airflow in the dust bin 4 is obliquely introduced into the fan shroud through the inlet swirl vane assembly 53, and its guiding direction is consistent with the airflow direction generated when the impeller of the fan body 6 rotates, thus avoiding frictional noise between the impeller and the airflow entering the fan shroud.
[0025] The fan upper cover 51 includes an integrally formed upper part, middle part, and lower part. The upper part is screwed to the bottom of the dust bin 4. The air inlet vortex assembly 53 is located in the middle part of the cover. The gap between the outer periphery of the lower part of the cover and the inner wall of the fan lower cover 52 is filled with sound-absorbing cotton 54. The sound-absorbing cotton 54 effectively reduces the energy of sound wave vibration and reduces noise.
[0026] Specifically, there are two gaps between the lower outer periphery of the cover and the inner wall of the fan lower cover 52, and they are symmetrically arranged along the center of the fan lower cover 52, so that the airflow is more uniform.
[0027] In some embodiments, the upper part of the cover is funnel-shaped, and the lower part of the cover and the connecting section between the middle part of the cover are inverted funnel-shaped, both of which can provide a good guiding effect for the airflow entering the fan cover.
[0028] An upper shock-absorbing pad 7, running through the middle, is provided at the junction of the lower interior of the cover and the middle part of the cover. A lower shock-absorbing pad 8 is provided at the bottom of the lower cover 52 of the fan. The installation of the upper and lower shock-absorbing pads can further and effectively reduce the noise caused by vibration during the operation of the fan body 6.
[0029] In some embodiments, a sound-absorbing cotton 9 is horizontally disposed between the bottom of the fan cover 52 and the bottom of the inner wall of the base station body 1 at the lower part of the base station body 1, to further reduce the energy of sound wave vibration.
[0030] The bottom of the dust chamber 4 is hollowed out, and an anti-clogging component 15 is provided on it. The anti-clogging component 15 includes an anti-clogging bracket 151 that matches the internal size of the dust chamber 4. The anti-clogging bracket 151 is hollowed out, and there is an installation space between its lower surface and the bottom of the dust chamber 4 for the sound-absorbing cotton 11 to be accommodated. The upper surface of the anti-clogging bracket 151 is provided with a number of support protrusions 152 extending toward the dust inlet 3.
[0031] The interior of the dust chamber 4 can be used to place a removable dust bag. The hollow design at the bottom of the dust chamber 4 allows the airflow entering from the dust inlet 3 to enter the fan. The negative pressure airflow generated by the fan body 6 can suck the dust and debris in the dust cup of the vacuum cleaner into the dust bag. As the dust and debris in the dust bag increase, the dust bag will fall downwards. The anti-clogging bracket 151 can effectively support the bottom of the dust bag and prevent the dust bag from falling and clogging the hollow air inlet at the bottom of the dust chamber 4.
[0032] The installation of sound-absorbing cotton 311 can further reduce the energy of sound wave vibration when the fan body 6 starts, thereby reducing the overall noise when the dust collection base station is in use.
[0033] In some embodiments, the anti-clogging bracket 151 includes several rows of horizontal brackets and vertical brackets arranged perpendicularly to each other. The support protrusion 152 is arranged at the intersection of the horizontal brackets and the vertical brackets, which will not affect the air intake and can also provide good support for the bottom of the dust bag.
[0034] The dust chamber 4 has an open side, and the inner walls of the other three sides are provided with several partition blocks from top to bottom. The bottom partition block and the bottom of the dust chamber 4 form a limited space for the anti-blocking bracket 151 to slide into, which facilitates the disassembly and installation of the anti-blocking bracket 151. The bracket side near the partition block is provided with a clearance groove to avoid interference with the sliding insertion of the anti-blocking bracket 151.
[0035] The dust chamber 4 is also equipped with a sterilization component 12, which includes a dust baffle 121 embedded in the bottom of the dust chamber 4. A UV lamp is located below the dust baffle 121, and the dust baffle 121 is made of transparent material. During the use of the dust collection station, bacteria inevitably grow in the dust bag. Adding a UV lamp inside the dust chamber 4 can effectively reduce the growth of bacteria inside the dust bag.
[0036] The dust shield 121 is made of transparent material, so it will not affect ultraviolet light irradiation and sterilization.
[0037] In some embodiments, the sterilization component 12 is disposed on the side of the anti-clogging bracket 151, the UV lamp is a UV ultraviolet lamp, the bottom of the dust chamber 4 is recessed with a mounting bracket, the circuit board of the UV lamp is disposed on the mounting bracket, the dust baffle 121 covers the top of the mounting bracket, the circuit board of the UV lamp is electrically connected to the control screen on the surface of the base station body 1, and when the sterilization button is pressed, the dust in the dust bag can be effectively sterilized.
[0038] An ambient lighting assembly is installed at the bottom of the base station body 1. This assembly includes an electronically controlled light panel 14 and a light guide strip 13. The electronically controlled light panel 14 is horizontally positioned within the base station body 1, and the light guide strip 13 is embedded in the bottom surface of the base station body 1 and connected to the electronically controlled light panel 14 with screws. The light guide strip 13 effectively enhances the aesthetics of the dust-collecting base station and prevents users from bumping into it in dimly lit indoor environments, thus improving the user experience.
[0039] The system also includes a base station base 2 detachably connected to the bottom of the base station body 1. The base station base 2 is hollow inside, and its outer wall is provided with at least one elastic buckle 18 that can tilt inward. The bottom of the base station body 1 has a buckle groove 19 that can engage with the elastic buckle 18. The base station base 2 can both support the placement of the base station body 1, ensuring its stability and reliability, and preventing the base station body 1 from being placed directly on the ground, which would cause the base station exhaust vent 10 at its bottom to be blocked; it can also effectively reduce the size of the product packaging box and reduce transportation costs.
[0040] When the base station body 1 is completely placed on the base station base 2, the elastic buckle 18 can be directly inserted into the buckle groove 19, so that the two are fixed together, ensuring the stability of the base station body 1. When disassembly is required, simply pull the base station base 2 with force, and the elastic buckle 18 can be disengaged from the buckle groove 19 under the pull of external force, realizing the quick disassembly of the base station body 1 and the base station base 2.
[0041] The base station body 1 has a guide groove 21 recessed at its bottom facing inward. The buckle groove 19 is formed on the groove wall of the guide groove 21. A positioning boss 20 is provided in the guide groove 21 protruding away from the base station body 1. A limited space is formed between the periphery of the positioning boss 20 and the inner wall of the guide groove 21 for the top of the base station base 2 to be inserted. This limited space can guide the subsequent insertion of the base station base 2. The upper surface of the base station base 2 is provided with a connecting groove 22 that matches the positioning boss 20. When the upper surface of the base station base 2 abuts against the top of the guide groove 21, the elastic buckle 18 is engaged with the buckle groove 19.
[0042] In some embodiments, the top of the base station base 2 can be inserted into the limited space formed between the outer periphery of the positioning boss 20 and the inner wall of the guide groove 21, which can support the base station body 1. The base station base 2 is flared, and its top inner diameter is smaller than its bottom inner diameter. This structure allows the base station base 2 to avoid blocking the base station exhaust hole 10 opened on the lower surface of the base station body 1 when supporting the base station body 1, thus avoiding affecting the exhaust of the dust collection base station.
[0043] The positioning boss 20 has a positioning protrusion 17 and at least one clamping protrusion 16 extending outward from its side. The connecting groove 22 has a positioning groove that matches the positioning protrusion extending outward from its outer periphery. When the base station base 2 is installed onto the base station body 1, the positioning groove guides the insertion of the positioning boss 20, allowing the user to easily assemble the base station base 2 and the base station body 1 together. The clamping protrusion 16 ensures that the base station body 1 will not easily detach under a small external force after being installed onto the base station base 2, thus ensuring the stability of the assembled dust collection base station.
[0044] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.
Claims
1. A dust collection base station, characterized in that: The system includes a base station body and a noise reduction mechanism. The base station body contains, from top to bottom, a dust inlet, a dust bin, and a fan assembly. The fan assembly includes a fan shroud and a fan body located within it. The fan shroud includes a detachably connected upper and lower fan shroud. The upper fan shroud is vertically continuous and has a first end and a second end. A noise reduction mechanism is located within the first end. This noise reduction mechanism includes a horizontally arranged air inlet swirl vane assembly. The guide direction of the vanes in the air inlet swirl vane assembly is consistent with the airflow direction when the fan body impeller rotates. The second end can extend into the lower fan shroud, and its outer wall at least partially has a gap with the inner wall of the lower fan shroud. The bottom of the base station body has several base station exhaust holes. Gas entering the fan shroud body from the dust inlet can flow through the gaps into the base station body and exit the base station body through an airflow channel formed between the inner wall of the base station body and the outer wall of the lower fan shroud, which is connected to the base station exhaust holes.
2. A dust collection base station according to claim 1, characterized in that: The air intake vortex assembly includes a central fixed column and several blades arranged in a ring along its outer wall. The end of each blade away from the central fixed column is obliquely fixed to the inner wall of the fan cover.
3. A dust collection base station according to claim 1, characterized in that: The fan cover includes an upper part, a middle part, and a lower part of the cover, which are integrally formed from top to bottom. The upper part of the cover is connected to the bottom of the dust bin with screws. The air inlet vortex assembly is located in the middle part of the cover. The gap between the outer periphery of the lower part of the cover and the inner wall of the fan cover is filled with sound-absorbing cotton.
4. A dust collection base station according to claim 3, characterized in that: An upper shock-absorbing pad is provided at the junction of the lower interior of the cover and the middle part of the cover, and a lower shock-absorbing pad is provided at the bottom of the lower cover of the fan.
5. A dust collection base station according to claim 1, characterized in that: The bottom of the dust chamber is hollowed out and an anti-clogging component is installed on it. The anti-clogging component includes an anti-clogging bracket that matches the size of the inside of the dust chamber. The anti-clogging bracket is hollowed out and there is an installation space between its lower surface and the bottom of the dust chamber for the sound-absorbing cotton to be accommodated. The upper surface of the anti-clogging bracket is provided with several support protrusions extending toward the dust inlet.
6. A dust collection base station according to claim 1, characterized in that: The dust chamber is also equipped with a sterilization component, which includes a dust baffle embedded in the bottom of the dust chamber and a UV lamp below the dust baffle. The dust baffle is made of transparent material.
7. A dust collection base station according to claim 1, characterized in that: An ambient light assembly is installed at the bottom of the base station body. The ambient light assembly includes an electronically controlled light board and a light guide strip. The electronically controlled light board is horizontally arranged in the base station body, and the light guide strip is embedded in the bottom surface of the base station body and connected to the electronically controlled light board with screws.
8. A dust collection base station according to claim 1, characterized in that: It also includes a base station base that is detachably connected to the bottom of the base station body. The base station base is hollow inside, and at least one elastic buckle that can tilt inward is provided on the outer wall of the base station base. The bottom of the base station body is provided with a buckle groove that can engage with the elastic buckle.
9. A dust collection base station according to claim 8, characterized in that: The base station body has a guide groove recessed at its bottom facing inwards. The buckle groove is formed on the groove wall of the guide groove. A positioning boss is provided in the guide groove facing away from the base station body. A limited space is formed between the periphery of the positioning boss and the inner wall of the guide groove for the top of the base station base to be inserted. The upper surface of the base station base has a connecting groove that matches the positioning boss. When the upper surface of the base station base abuts against the top of the guide groove, the elastic buckle is engaged with the buckle groove.
10. A dust collection base station according to claim 9, characterized in that: The positioning boss has a positioning protrusion and at least one pressing protrusion extending outward from its side, and the connecting groove has a positioning groove that matches the positioning protrusion extending outward from its outer periphery.