A chassis component and an air purifier

Abstract

This invention provides a chassis assembly and an air purifier, comprising: a bottom shell with several through holes on its bottom surface; a bracket disposed inside the bottom shell, with several travel wheels at its bottom, the travel wheels corresponding to the through holes, having a movable position to move to the outside of the through holes and support the bottom shell; and a lifting assembly with a built-in power component, adapted to drive the bracket to move up and down, causing the travel wheels to enter or leave the movable position. By providing a liftable bracket with travel wheels inside the bottom shell, the travel wheels can extend out of the bottom shell, and after entering the movable position, support the chassis assembly or a device on which the chassis assembly is mounted, and can be dragged freely. Furthermore, when the power component in the lifting assembly controls the bracket to rise, and the travel wheels retract into the bottom shell, the bottom shell contacts the ground, and the friction can prevent the chassis assembly and the device on which the chassis assembly is mounted from sliding, thus meeting the user's needs for easy movement and preventing slippage after installation.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, specifically to a chassis assembly and an air purifier. Background Technology

[0002] Air purifiers can adsorb, decompose, or transform various air pollutants, effectively improving air cleanliness and providing users with clean and safe air. Air purifiers are widely used in various fields.

[0003] Air purifier chassis come in two types: wheeled chassis and silicone anti-slip chassis. Wheeled chassis facilitate movement and allow for easy dragging, while silicone anti-slip chassis have anti-slip silicone installed to prevent slippage. As appliances frequently used in homes and workplaces, air purifiers often need to simultaneously meet the user's needs for easy movement and preventing slippage after placement, but common chassis components often fail to provide both. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the fact that the air purifiers in the prior art cannot simultaneously meet the needs of easy movement and prevention of slippage after placement, thereby providing a chassis assembly and an air purifier.

[0005] This invention provides a chassis assembly, comprising: a bottom shell, wherein a plurality of through holes are provided on the bottom surface;

[0006] A bracket is disposed inside the bottom housing, and a plurality of travel wheels are provided at the bottom. The travel wheels are arranged corresponding to the through holes and have a movable position to move to the outside of the through holes and support the bottom housing.

[0007] The lifting assembly is located inside the bottom housing and has a built-in power component, which is suitable for driving the bracket to move up and down, so that the traveling wheels enter or leave the moving position.

[0008] The lifting assembly includes: the power component, which is disposed on the bottom housing and includes an output shaft;

[0009] At least one second gear, wherein one of the second gears is connected to the output shaft, includes a protrusion disposed on at least one end side of the second gear and abutting against the bracket, the protrusion including at least one unidirectional portion, the height of the unidirectional portion gradually increasing or decreasing along the rotation direction of the second gear.

[0010] There are two second gears, and the two second gears are meshed together.

[0011] A first gear is provided on the output shaft, which meshes with the second gear and is adapted to output power to the second gear.

[0012] The two second gears are arranged symmetrically relative to the first gear.

[0013] The protrusion is arranged in a ring shape and includes two unidirectional parts arranged in a mirror shape. The central axis of the protrusion coincides with the central axis of the second gear, and the end face of the protrusion away from the second gear is a plane.

[0014] The second gear is provided with a limiting hole, which is concentric with the protrusion, and the central angle of the limiting hole is the same as the central angle of the one-way part.

[0015] A stop pin is provided on the bottom shell, the stop pin protrudes from the inner bottom surface of the bottom shell and passes through the limiting hole.

[0016] The protrusions are located at both ends of the second gear along the height direction.

[0017] The bottom housing includes a fixing pin, which protrudes from the bottom surface of the bottom housing, is parallel to the output shaft, and passes through the second gear. The second gear is adapted to rotate about the fixing pin as a rotation axis.

[0018] The bottom housing also includes a first positioning post, which protrudes outward from the bottom surface of the bottom housing and has a first limiting plate on its top, which passes through the bracket and is adapted to limit the horizontal movement of the bracket.

[0019] The bottom housing also includes a second positioning post that passes through the bracket and includes a second limiting plate and an elastic element, the elastic element being disposed between the bracket and the second limiting plate.

[0020] The bottom housing also includes: a first pulley portion, which is protruding away from the inner bottom surface of the bottom housing and includes a first frame with the first pulley. The first pulley is rotatably connected to the first frame and is adapted to receive the protrusion and rotate relative to the first frame under the drive of the protrusion.

[0021] The bracket is provided with a second pulley section, which is located on the top of the protrusion and includes a second frame body with the second pulley, the second pulley being rotatably connected to the protrusion.

[0022] The second pulley section is positioned vertically directly above the first pulley section.

[0023] The first pulley and the second pulley are arranged in a conical shape.

[0024] The protrusions are provided with inclined chamfers at the contact points with the first pulley and the second pulley, and the first pulley and the second pulley are attached to the inclined chamfer positions.

[0025] The bracket also includes: a caster bracket, which is frame-shaped and has a first receiving hole and a second receiving hole spaced apart along each side. The first receiving hole is adapted to accommodate the first positioning post, and the second receiving hole is adapted to accommodate the second positioning post.

[0026] The travel wheels are mounted on the bottom surface corresponding to each corner of the caster frame.

[0027] Several anti-slip pads are provided on the outer bottom surface of the bottom shell, and the anti-slip pads are evenly distributed along the bottom shell.

[0028] The present invention also provides an air purifier, including the chassis assembly described above.

[0029] The technical solution of this invention has the following advantages:

[0030] 1. The present invention provides a chassis assembly, comprising: a bottom shell having a plurality of through holes on its bottom surface; a bracket disposed inside the bottom shell, having a plurality of travel wheels at its bottom, the travel wheels being disposed corresponding to the through holes and having a movable position for moving to the outside of the through holes and supporting the bottom shell; and a lifting assembly having a built-in power component adapted to drive the bracket to perform lifting movements, so that the travel wheels enter or leave the movable position.

[0031] By installing a liftable bracket with travel wheels inside the bottom housing, the travel wheels can extend out of the bottom housing and, after entering the moving position, support the chassis assembly or the device on which the chassis assembly is installed, and can be dragged at will. In addition, when the power component in the lifting assembly controls the bracket to rise and the travel wheels retract into the bottom housing, the bottom housing has a large contact area with the ground. The friction between the bottom surface of the bottom housing and the ground can prevent the chassis assembly and the device on which the chassis assembly is installed from sliding, thus meeting the user's needs for easy movement and prevention of sliding after installation.

[0032] 2. The chassis assembly provided by the present invention includes a lifting assembly comprising: the power component, disposed on the bottom housing, including an output shaft; at least one second gear, wherein one of the second gears is connected to the output shaft and includes a protrusion, the protrusion being disposed on at least one end side of the second gear and abutting against the bracket, the protrusion including at least one one-way portion, the height of the one-way portion gradually increasing or decreasing along the rotation direction of the second gear.

[0033] With this configuration, the power unit transmits power to the second gear through the output shaft and gear structure. The second gear has a protrusion that abuts against the bracket. The height of the one-way part on the protrusion gradually increases or decreases along the rotation direction of the second gear. When the one-way part abuts against the bracket, the distance between the bracket and the bottom surface of the bottom housing changes unidirectionally, so that the bracket can effectively complete the controllable lifting and lowering action.

[0034] 3. The chassis assembly provided by the present invention has a first gear on the output shaft, the first gear meshing with a second gear, and is adapted to output power to the second gear.

[0035] The first gear allows the output shaft connected to the power component to simultaneously output power to multiple second gears. The protrusions on the multiple second gears can effectively support the bracket and distribute the force. On the other hand, the first gear can change the transmission ratio by altering the meshing relationship with the second gears, thereby adjusting the lifting and lowering speed of the bracket.

[0036] 4. In the chassis assembly provided by the present invention, the two second gears are symmetrically arranged relative to the first gear.

[0037] The symmetrically arranged second gears can support the support frame by evenly distributing the force, thus preventing the support frame from tipping over.

[0038] 5. The chassis assembly provided by the present invention has a protrusion arranged in a ring shape, including two unidirectional parts arranged in a mirror shape, the central axis of the protrusion coincides with the central axis of the second gear, and the end face of the protrusion away from the second gear is a plane.

[0039] This configuration allows the rotation angle of the unidirectional part corresponding to the second gear to be 180 degrees. Because the two unidirectional parts are mirror images of each other, the lifting and lowering process of the bracket abutting the protrusion can be achieved either by the unidirectional rotation of the second gear or by the forward and reverse rotation of the second gear. Simultaneously, the relatively large rotation angle between the unidirectional part and the second gear results in a more uniform change in the height of the protrusion protruding from the side of the second gear and the height of the bracket abutting the protrusion, avoiding impacts caused by sudden stroke changes and improving the device's service life. Furthermore, the ends of the protrusion facing away from the side of the second gear are on the same plane, and the protrusion can be obtained by cutting from the barrel-shaped body protruding from the second gear, facilitating the processing and manufacturing of the protrusion, reducing processing difficulty, and improving production efficiency.

[0040] 6. In the chassis assembly provided by the present invention, the second gear is provided with a limiting hole, the limiting hole is concentric with the protrusion, and the central angle of the limiting hole is consistent with the central angle of the one-way part; a stop pin is provided on the bottom housing, the stop pin is protruding from the inner bottom surface of the bottom housing and passes through the limiting hole.

[0041] Since the central angle of the limiting hole is the same as that of the one-way part, that is, the limiting hole and the one-way part are set at the same circular angle position, and a stop pin is also provided, this setting allows the second gear to control the lifting and lowering of the bracket by forward and reverse rotation, thereby limiting the movement of the bracket and ensuring the fixed stroke of the protrusion. This makes the specific stroke of the extension and retraction of the travel wheel on the bracket controllable and reduces the stroke error caused by the one-way start-stop rotation control of the power component.

[0042] 7. The chassis assembly provided by the present invention has protrusions located at both ends of the second gear along the height direction.

[0043] This design increases the length of the protrusion extending beyond the side of the second gear, thereby improving the travel distance of the bracket along the direction perpendicular to the bottom housing.

[0044] 8. The chassis assembly provided by the present invention further includes a bottom shell: a second positioning post, the second positioning post passing through the bracket, including a second limiting plate and an elastic member, the elastic member being disposed between the bracket and the second limiting plate.

[0045] The second positioning post is set on the bottom shell, and the elastic element on the second positioning post applies an elastic force toward the bottom shell to the bracket, providing power for the travel wheel to move to the outside of the bottom shell. In addition, the setting of the elastic element plays a shock absorption role in supporting the travel wheel and moving the bottom shell.

[0046] 9. The chassis assembly provided by the present invention further includes a bottom housing: a first pulley portion, the first pulley portion being disposed protruding away from the inner bottom surface of the bottom housing, including a first frame having the first pulley, the first pulley being rotatably connected to the first frame, the first pulley being adapted to receive the protrusion and rotate relative to the first frame under the drive of the protrusion.

[0047] The first pulley section is set to receive and support the second gear. The first pulley on it abuts against the protrusion and moves relative to it, which reduces the frictional resistance between the first pulley and the protrusion, improves the working efficiency of the chassis assembly, reduces the wear of the protrusion, and increases the service life of the chassis assembly.

[0048] 10. The chassis assembly provided by the present invention includes a bracket with a second pulley portion, the second pulley portion being disposed on the top of the protrusion, and a second frame having a second pulley, the second pulley being rotatably connected to the protrusion.

[0049] The second pulley part cooperates with the first pulley part and abuts against the protrusions on both sides of the second gear, so that when the protrusions come into contact with the bottom shell and the bracket, the sliding friction is changed to rolling friction, which reduces the resistance when the protrusions move and improves the working efficiency of the chassis assembly.

[0050] 11. The chassis assembly provided by the present invention has an inclined chamfer at the contact point between the protruding portion and the first pulley and the second pulley, and the first pulley and the second pulley are attached to the inclined chamfer position.

[0051] Because the first and second pulleys are tapered and the ends of the protrusions are on the same plane, the second gear, during rotation, presents different contact angles between the ends of the protrusions and the first pulley. This reduces the contact area between the first pulley and the protrusions, increases the compressive stress on the first pulley from the protrusions, and reduces the lifespan of the first pulley. The same applies to the second pulley. The chamfered design keeps the contact area between the first and second pulleys and the protrusions at the maximum contact area. This reduces frictional resistance while decreasing the compressive stress on each pulley, thus improving the service life of the chassis assembly.

[0052] 12. The chassis assembly provided by the present invention has a plurality of anti-slip pads provided on the outer bottom surface of the bottom shell, and the anti-slip pads are evenly distributed along the bottom shell.

[0053] The anti-slip rubber pads can increase the friction between the chassis and the ground after the travel wheels are retracted into the chassis, thus preventing the chassis components from sliding. Attached Figure Description

[0054] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0055] Figure 1 This is a perspective view of the chassis assembly provided in the first embodiment of the present invention;

[0056] Figure 2 for Figure 1 Top view of the chassis components shown;

[0057] Figure 3 for Figure 1 Exploded view of the chassis components shown;

[0058] Figure 4 for Figure 1 A cross-sectional view of the chassis components shown.

[0059] Explanation of reference numerals in the attached figures:

[0060] 1 – Bottom shell; 2 – Bracket; 3 – Lifting assembly; 11 – Through hole; 12 – Stop pin; 13 – Fixing pin; 14 – First pulley; 15 – First frame; 16 – First positioning post; 17 – Second positioning post; 161 – First limiting plate; 171 – Second limiting plate; 172 – Elastic element; 18 – Anti-slip pad; 21 – Caster bracket; 211 – First receiving hole; 212 – Second receiving hole; 213 – Second pulley; 214 – Second frame; 22 – Traveling wheel; 31 – Power component; 32 – First gear; 33 – Second gear; 331 – Protrusion; 332 – Limiting hole. Detailed Implementation

[0061] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0063] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0064] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0065] like Figure 1 - Figure 4As shown, a chassis assembly includes: a bottom housing 1 with a plurality of through holes 11 on its bottom surface; a bracket 2 disposed inside the bottom housing 1 with a plurality of traveling wheels 22 at its bottom, the traveling wheels 22 being disposed corresponding to the through holes 11 and having a movable position to move to the outside of the through holes 11 and support the bottom housing 1; and a lifting assembly 3 disposed inside the bottom housing 1, having a built-in power component 31, adapted to drive the bracket 2 to perform lifting movements, so that the traveling wheels 22 enter or leave the movable position.

[0066] By providing a liftable bracket 2 with travel wheels 22 inside the bottom housing 1, the travel wheels 22 can extend out of the bottom housing 1 and enter the moving position to support the chassis assembly or the device on which the chassis assembly is installed, and can be dragged at will. In addition, when the power component 31 in the lifting assembly 3 controls the bracket 2 to rise and the travel wheels 22 retract into the bottom housing 1, the bottom housing 1 has a large contact area with the ground. The friction between the bottom surface of the bottom housing 1 and the ground can prevent the chassis assembly and the device on which the chassis assembly is installed from sliding, thus meeting the user's needs for easy movement and prevention of sliding after installation.

[0067] In this embodiment, the power component 31 is a motor, and the travel wheel 22 is a swivel wheel.

[0068] The lifting assembly 3 includes: a power component 31, mounted on the base housing 1, including an output shaft; at least one second gear 33, one of which is connected to the output shaft and includes a protrusion 331. The protrusion 331 is disposed on at least one side of the second gear 33 and abuts against the bracket 2. The protrusion 331 includes at least one unidirectional portion, the height of which gradually increases or decreases along the rotation direction of the second gear 33. Figure 1 As shown, in this embodiment, the power component 31 is located in the middle of the bottom housing 1 and is fixed on the motor frame on the bottom housing 1, with the output shaft facing the bottom housing 1.

[0069] With this configuration, the power unit 31 transmits power to the second gear 33 through the output shaft and gear structure. The second gear 33 is provided with a protrusion 331 that abuts against the bracket 2. The height of the one-way portion on the protrusion 331 gradually increases or decreases along the rotation direction of the second gear 33. When the one-way portion abuts against the bracket 2, the distance between the bracket 2 and the bottom surface of the bottom housing 1 changes unidirectionally, so that the bracket 2 can effectively complete the controllable lifting and lowering action.

[0070] In this embodiment, as Figure 1 As shown, in a preferred embodiment, there are two second gears 33, which mesh with each other via gear engagement. A first gear 32 is provided on the output shaft, which meshes with the second gears 33 and is adapted to output power to the second gears 33.

[0071] The first gear 32 is configured so that the output shaft connected to the power component 31 can simultaneously output power to multiple second gears 33. The protrusions 331 on the multiple second gears 33 can effectively support the bracket 2 and play a role in distributing the force. On the other hand, the first gear 32 can change the transmission ratio by changing the meshing relationship with the second gear 33, thereby adjusting the lifting and lowering speed of the bracket 2.

[0072] As an alternative implementation, the first gear 32 may be omitted, and the output shaft on the power component 31 may be connected to one of the two second gears 33, allowing the two second gears 33 to mesh directly and achieve synchronous rotation.

[0073] As another alternative implementation, the first gear 32 may be omitted, and a second gear 33 may be provided and connected to the output shaft of the power component 31.

[0074] In this embodiment, two second gears 33 are symmetrically arranged relative to the first gear 32. The symmetrically arranged second gears 33 can support the bracket 2 by evenly distributing the force, preventing the bracket 2 from tipping over. As an alternative implementation, multiple second gears 33 are provided, each meshing with a first gear 32 and evenly distributed around the first gear 32.

[0075] In this embodiment, the protrusion 331 is arranged in a ring shape and includes two mirror-shaped unidirectional parts. The central axis of the protrusion 331 coincides with the central axis of the second gear 33, and the end face of the protrusion 331 away from the second gear 33 is a plane.

[0076] This configuration allows the rotation angle of the one-way section corresponding to the second gear 33 to be 180 degrees. Because the two one-way sections are mirror images of each other, the lifting and lowering process of the bracket 2, which abuts against the protrusion, can be achieved either by the one-way rotation of the second gear 33 or by the forward and reverse rotation of the second gear 33. Simultaneously, the relatively large rotation angle between the one-way section and the second gear 33 results in a more uniform change in the height of the protrusion 331 protruding from the side of the second gear 33 and the height of the bracket 2 abutting against it, avoiding impacts caused by sudden stroke changes and improving the lifespan of the device. Furthermore, the ends of the protrusion 331 facing away from the side of the second gear 33 are on the same plane. The protrusion 331 can be obtained by cutting from the barrel-shaped body protruding from the second gear 33, facilitating the processing and manufacturing of the protrusion 331, reducing processing difficulty, and improving production efficiency.

[0077] like Figure 2As shown in Figure 4, the second gear 33 is provided with a limiting hole 332, which is concentric with the protrusion 331. The central angle of the limiting hole 332 is the same as the central angle of the one-way portion. A stop pin 12 is provided on the bottom housing 1, which protrudes from the inner bottom surface of the bottom housing 1 and passes through the limiting hole 332. In this embodiment, the central angle of the limiting hole 332 is 180 degrees, the same as the central angle of the one-way portion.

[0078] Since the central angle of the limiting hole 332 is the same as the central angle of the one-way part, that is, the limiting hole 332 and the one-way part are set at the same circular angle position, and a stop pin 12 is also provided, this setting allows the second gear 33 to control the lifting and lowering of the bracket 2 by forward and reverse rotation, thereby limiting the movement of the bracket 2 and ensuring the fixed stroke of the protrusion 331. This makes the specific stroke of the extension and retraction of the travel wheel 22 on the bracket 2 controllable and reduces the stroke error caused by the one-way start-stop rotation control of the power component 31.

[0079] As an alternative implementation, the limiting hole 332 and the stop pin 12 may also be omitted.

[0080] The protrusions 331 are located at both ends of the second gear 33 along the height direction. This arrangement increases the length of the protrusions 331 protruding from the side of the second gear 33, thereby increasing the travel of the bracket 2 in the direction perpendicular to the bottom housing 1.

[0081] The bottom housing 1 also includes two fixing pins 13, which are protruding from the bottom surface of the bottom housing 1 and parallel to the output shaft. They pass through the second gear 33 respectively, and the second gear 33 is adapted to rotate about the fixing pins 13 as the rotation axis.

[0082] As an alternative implementation, the fixing pin 13 may be provided with a limiting groove or a limiting shoulder to limit the second gear 33, while the first pulley part may not be provided.

[0083] The bottom housing 1 also includes a first positioning post 16, which protrudes from the inner bottom surface of the bottom housing 1 and has a first limiting plate 161 at its top. The first positioning post 16 passes through the bracket 2 and is adapted to limit the horizontal movement of the bracket 2. The bottom housing 1 also includes a second positioning post 17, which passes through the bracket 2 and includes a second limiting plate 171 and an elastic element 172. The elastic element 172 is disposed between the bracket 2 and the second limiting plate 171. In this embodiment, the elastic element 172 is a spring.

[0084] The second positioning post 17 is installed on the bottom housing 1, and the elastic element 172 on the second positioning post 17 applies an elastic force toward the bottom housing 1 to the bracket 2, providing power for the travel wheel 22 to move to the outside of the bottom housing 1. In addition, the installation of the elastic element 172 plays a shock absorption role in supporting the travel wheel 22 and moving the bottom housing 1.

[0085] The shapes of the first positioning post 16 and the second positioning post 17 are not limited. In this embodiment, the first positioning post 16 is rectangular and the second positioning post 17 is cylindrical. Different positioning post shapes facilitate the assembly of the chassis components.

[0086] As an alternative implementation, the first positioning post 16 may be omitted, and several second positioning posts 17 may be provided to pass through the bracket 2 at different positions.

[0087] like Figure 3 As shown, the bottom housing 1 also includes: a first pulley portion, which is protruding from the bottom surface of the bottom housing 1 and includes a first frame 15 with a first pulley 14. The first pulley 14 is rotatably connected to the first frame 15 and is adapted to receive the protrusion 331 and rotate relative to the first frame 15 under the drive of the protrusion 331.

[0088] The first pulley section is set to receive and support the second gear 33. The first pulley 14 on it abuts against the protrusion 331 and moves relative to it, which reduces the frictional resistance between the first pulley 14 and the protrusion 331, improves the working efficiency of the chassis assembly, reduces the wear of the protrusion 331, and improves the service life of the chassis assembly.

[0089] The bracket 2 is provided with a second pulley section, which is located on the top of the protrusion 331 and includes a second frame 214 with a second pulley 213. The second pulley 213 is rotatably connected to the protrusion 331.

[0090] The second pulley part cooperates with the first pulley part and abuts against the protrusions 331 on both sides of the second gear 33, so that when the protrusions 331 contact the bottom shell 1 and the bracket 2, the sliding friction is changed to rolling friction, which reduces the resistance when the protrusions 331 move and improves the working efficiency of the chassis assembly.

[0091] In this embodiment, the second pulley portion is arranged vertically directly above the first pulley portion.

[0092] As an alternative implementation, the first pulley portion and the second pulley portion may be omitted, and the protrusion 331 may directly abut against the surfaces of the bottom housing 1 and the bracket 2.

[0093] As an alternative implementation, one of the first pulley section and the second pulley section may be omitted.

[0094] In this embodiment, the first pulley 14 and the second pulley 213 are tapered. This design allows for a larger contact area with the edge of the protrusion 331, improving the smoothness of movement. The protrusion 331 has a chamfered angle at the contact points with the first pulley 14 and the second pulley 213, and the first pulley 14 and the second pulley 213 are fitted at the chamfered angle positions.

[0095] Since the first pulley 14 and the second pulley 213 are tapered and the ends of the protrusions 331 are on the same plane, during the rotation of the second gear 33, the ends of the protrusions 331 and the first pulley 14 present different contact angles, which reduces the contact area between the first pulley 14 and the protrusions 331, increases the compressive stress of the protrusions 331 on the first pulley 14, and reduces the lifespan of the first pulley 14. The same applies to the second pulley 213. The inclined chamfer setting keeps the contact area between the first pulley 14 and the second pulley 213 and the protrusions 331 at the maximum contact area. While ensuring reduced frictional resistance, it also reduces the compressive stress received by each pulley and improves the service life of the chassis assembly.

[0096] The bracket 2 also includes a caster frame 21 and travel wheels 22. A first receiving hole 211 and a second receiving hole 212 are provided at intervals along each side of the caster frame 21. The first receiving hole 211 is suitable for receiving the first positioning post 16, and the second receiving hole 212 is suitable for receiving the second positioning post 17. Four travel wheels 22 are provided on the bottom surface corresponding to each corner of the caster frame 21.

[0097] In this embodiment, the shape of the caster frame 21 is not limited and can be flat, triangular, or polygonal frame, etc. As a preferred embodiment, the caster frame 21 is square frame, which can save manufacturing materials, and the travel wheels 22 set at each corner provide a more stable support for the chassis.

[0098] Five anti-slip pads 18 are provided on the outer bottom surface of the bottom housing 1, evenly distributed along the four corners of the bottom housing 1 and the corresponding positions of the power components 31. The anti-slip pads 18 can increase the friction between the bottom housing 1 and the ground after the travel wheels 22 are retracted into the bottom housing 1, thus preventing the chassis assembly from sliding.

[0099] This embodiment also provides an air purifier, including the chassis assembly described above.

[0100] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An air purifier, characterized in that, Includes a chassis assembly, the chassis assembly comprising: The bottom shell (1) has several through holes (11) on its bottom surface; A bracket (2) is provided inside the bottom shell (1), and a plurality of travel wheels (22) are provided at the bottom. The travel wheels (22) are provided corresponding to the through hole (11) and have a moving position to move to the outside of the through hole (11) and support the bottom shell (1). The lifting assembly (3) is located inside the bottom shell (1) and has a built-in power component (31) adapted to drive the bracket (2) to move up and down, so that the traveling wheel (22) enters or leaves the moving position; The lifting assembly (3) includes: The power component (31) is mounted on the bottom housing (1) and includes an output shaft; At least one second gear (33), wherein one of the second gears (33) is connected to the output shaft and includes a protrusion (331) disposed on at least one end side of the second gear (33) and abutting against the bracket (2), the protrusion including at least one one-way portion, the height of the one-way portion gradually increasing or decreasing along the rotation direction of the second gear (33).

2. The air purifier according to claim 1, characterized in that, There are two second gears (33), and the two second gears (33) are meshed with each other.

3. The air purifier according to claim 2, characterized in that, The output shaft is provided with a first gear (32), which meshes with the second gear (33) and is adapted to output power to the second gear (33).

4. The air purifier according to claim 3, characterized in that, The two second gears (33) are symmetrically arranged relative to the first gear (32).

5. The air purifier according to any one of claims 1-4, characterized in that, The protrusion (331) is arranged in a ring shape and includes two unidirectional parts arranged in a mirror shape. The central axis of the protrusion (331) coincides with the central axis of the second gear (33). The end face of the protrusion (331) away from the second gear (33) is a plane.

6. The air purifier according to claim 5, characterized in that, The second gear (33) is provided with a limiting hole (332), the limiting hole (332) is concentric with the protrusion (331), and the central angle of the limiting hole (332) is the same as the central angle of the one-way part; A stop pin (12) is provided on the bottom shell (1). The stop pin (12) protrudes from the bottom surface of the bottom shell (1) and passes through the limiting hole (332).

7. The air purifier according to any one of claims 1-4, characterized in that, The protrusion (331) is located at both ends of the second gear (33) along the height direction.

8. The air purifier according to claim 7, characterized in that, The bottom housing (1) includes a fixing pin (13) which protrudes from the bottom surface of the bottom housing (1), is parallel to the output shaft, and passes through the second gear (33). The second gear (33) is adapted to rotate about the fixing pin (13) as the rotation axis.

9. The air purifier according to claim 8, characterized in that, The bottom shell (1) also includes a first positioning post (16), which protrudes from the bottom surface of the bottom shell (1) and has a first limiting plate (161) on its top, which passes through the bracket (2) and is suitable for limiting the horizontal movement of the bracket (2).

10. The air purifier according to claim 9, characterized in that, The bottom housing (1) further includes a second positioning post (17), which passes through the bracket (2) and includes a second limiting plate (171) and an elastic element (172), wherein the elastic element (172) is disposed between the bracket (2) and the second limiting plate (171).

11. The air purifier according to claim 10, characterized in that, The bottom shell (1) further includes: a first pulley portion, which is provided protruding from the bottom surface of the bottom shell (1) and includes a first frame (15) with a first pulley (14). The first pulley (14) is rotatably connected to the first frame (15). The first pulley (14) is adapted to receive the protrusion (331) and rotate relative to the first frame (15) under the drive of the protrusion (331).

12. The air purifier according to claim 11, characterized in that, The bracket (2) is provided with a second pulley section, which is located on the top of the protrusion (331) and includes a second frame (214) with a second pulley (213). The second pulley (213) is rotatably connected to the protrusion (331).

13. The air purifier according to claim 12, characterized in that, The second pulley section is arranged vertically directly above the first pulley section.

14. The air purifier according to claim 12 or 13, characterized in that, The first pulley (14) and the second pulley (213) are arranged in a conical shape.

15. The air purifier according to claim 14, characterized in that, The protrusion (331) is provided with an inclined chamfer at the contact point with the first pulley (14) and the second pulley (213), and the first pulley (14) and the second pulley (213) are attached to the inclined chamfer position.

16. The air purifier according to claim 10, characterized in that, The support (2) also includes: The caster bracket (21) is frame-shaped and has a first receiving hole (211) and a second receiving hole (212) spaced along each side. The first receiving hole (211) is suitable for receiving the first positioning post (16), and the second receiving hole (212) is suitable for receiving the second positioning post (17). The travel wheels (22) are mounted on the bottom surface corresponding to each corner of the caster frame (21).

17. The air purifier according to any one of claims 1-4, characterized in that, A plurality of anti-slip pads (18) are provided on the outer bottom surface of the bottom shell (1), and the anti-slip pads (18) are evenly distributed along the bottom shell (1).

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