Air purifier for collecting pet hair

US20260251327A1Pending Publication Date: 2026-08-27NINGBO TALLER ELECTRICAL APPLIANCE CO LTD
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Patent Information

Application Number
US19/210003
Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Priority Date
2025-02-26
Filing Date
2025-05-16
Publication Date
2026-08-27

AI Technical Summary

Technical Problem

As pets become important family members gradually, problems such as hair, dander, allergens, and peculiar smells caused by pets become increasingly prominent.

Benefits of technology

[0032]Based on the above technical solutions, the present disclosure may at least fulfill the following technical effects:

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Abstract

Provided is an air purifier for collecting pet hair, including an outer shell, wherein an air inlet is provided in a side surface of the outer shell, and an accommodating groove is provided at a position adjacent to the air inlet; a hair collecting box, provided in the accommodating groove, wherein a first inlet is provided in a side, proximal to the interior of the air purifier, of the hair collecting box; and an air inlet channel, provided inside the outer shell and connected to the air inlet and the first inlet respectively, wherein a side wall of the air inlet channel is at least configured to form a part of the accommodating groove, and when the air purifier works, pet hair enters the hair collecting box through the air inlet, the air inlet channel, and the first inlet in sequence.
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Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] The present application claims the benefit of Chinese Patent Application No. 202510218085.9, filed on Feb. 26, 2025, the contents of which are incorporated herein by reference in their entirety.BACKGROUND OF THE INVENTION1. Technical Field

[0002] The present disclosure belongs to the technical field of air purifiers, and in particular, relates to an air purifier for collecting pet hair.

[0003] 2. Description of Related Art

[0004] Air purifiers for pets are subdivided household appliances developed with a sharp increase of pet-keeping families and an update of health requirements in recent years. As pets become important family members gradually, problems such as hair, dander, allergens, and peculiar smells caused by pets become increasingly prominent. Conventional air purifiers hardly solve these combined pollutions in a targeted manner.

[0005] Chinese Patent Publication No. CN118776000A discloses an air purifier for pets, having a pet hair collecting and handling system based on air flow control. An external airflow containing float hair and dander of pets is sucked by a strong airflow generated by an air duct wheel unit to a pre-filter screen in a shell to be filtered; a pre-filter screen unit filters the float hair and dander of pets to an airflow blowing side of the filter screen; and a fan is provided on a shell side corresponding to the side surface of the pre-filter screen to blow pet hair on the filter screen to a collecting box.

[0006] The above air purifier uses two fans, an air duct wheel unit and a side fan, to collect pet hair, thereby being complex in control and high in cost.BRIEF SUMMARY OF THE INVENTION

[0007] To solve the above problems in the prior art, an objective of the present disclosure provides an air purifier for collecting pet hair.

[0008] The objective of the present disclosure may be achieved by the following technical solutions: an air purifier for collecting pet hair includes:

[0009] an outer shell, where an air inlet is provided in a side surface of the outer shell, and an accommodating groove is provided at a position adjacent to the air inlet;

[0010] a hair collecting box, provided in the accommodating groove, where a first inlet is provided in a side, proximal to an interior of the air purifier, of the hair collecting box; and

[0011] an air inlet channel, provided inside the outer shell and connected to the air inlet and the first inlet respectively,

[0012] wherein a side wall of the air inlet channel is at least configured to form a part of the accommodating groove, and when the air purifier works, pet hair enters the hair collecting box through the air inlet, the air inlet channel, and the first inlet in sequence.

[0013] As a further improvement of the present disclosure, the hair collecting box includes a hair collecting channel and an accommodating space, the hair collecting channel and the accommodating space are divided by a dividing wall, two ends of the hair collecting channel are respectively a first inlet and a second inlet, and the second inlet is connected to the accommodating space.

[0014] As a further improvement of the present disclosure, a channel bore of the hair collecting channel decreases gradually in a direction from the first inlet to the second inlet.

[0015] As a further improvement of the present disclosure, the dividing wall and a side wall of the hair collecting box are provided as a whole.

[0016] As a further improvement of the present disclosure, a channel bore of the air inlet channel decreases gradually in a direction from the air inlet to the first inlet.

[0017] As a further improvement of the present disclosure, a downward recess is provided at a position of the air inlet channel adjacent to the first inlet.

[0018] As a further improvement of the present disclosure, the air purifier for collecting pet hair further includes a middle frame and an inner shell, where the outer shell further comprises an upper shell and a lower shell, the middle frame is provided on the lower shell, the inner shell is provided on the middle frame, and the upper shell is detachably connected to the inner shell.

[0019] As a further improvement of the present disclosure, the air purifier for collecting pet hair further includes a filter cartridge and a power device, where the filter cartridge and the power device are provided above the air inlet channel in sequence, and the filter cartridge is provided in a mounting space enclosed by the middle frame and the inner shell.

[0020] As a further improvement of the present disclosure, the air inlet is provided in a side surface of the lower shell and a bottom of the air inlet is flush with a bottom of the lower shell.

[0021] As a further improvement of the present disclosure, the power device includes a volute casing and a wind wheel provided in the volute casing, the volute casing is provided at a top of the inner shell, an air grid is provided at the top of the inner shell, and the air inlet channel is connected to the volute casing through the air grid.

[0022] As a further improvement of the present disclosure, an air outlet is provided in the side surface of the upper shell, the volute casing is connected to the air outlet, and an orientation of the air outlet is different from an orientation of the air inlet.

[0023] As a further improvement of the present disclosure, an orientation of the air outlet is perpendicular to an orientation of the air inlet.

[0024] As a further improvement of the present disclosure, the air outlet is provided with a negative-ion generator.

[0025] As a further improvement of the present disclosure, the air purifier for collecting pet hair further includes a storage box, where the storage box is provided on the upper shell and is detachably connected to the middle frame.

[0026] As a further improvement of the present disclosure, a button is provided on a surface, facing outward, of the storage box, a hook is connected to the button, a clamping groove is provided at a corresponding position of the middle frame, and the hook is snap fit with the clamping groove.

[0027] As a further improvement of the present disclosure, a tray is provided at a top of the outer shell, a plurality of mounting columns are provided on a bottom surface of the tray, a plurality of mounting bases are provided at corresponding positions of a top surface of the inner shell, and the mounting columns are inserted into the mounting bases.

[0028] As a further improvement of the present disclosure, a heating element is provided on the tray.

[0029] As a further improvement of the present disclosure, the air purifier for collecting pet hair further includes a sensor system, where the sensor system is configured to detect a weight of the air purifier, and when the weight of the air purifier reaches a first threshold, the wind wheel is switched to a higher rotating speed.

[0030] As a further improvement of the present disclosure, when the weight of the air purifier reaches a second threshold that is greater than the first threshold, the wind wheel stops working.

[0031] As a further improvement of the present disclosure, the air purifier for collecting pet hair further includes a sensor system, where the sensor system is configured to detect a movement of the air purifier, and when it is detected that the movement of the air purifier reaches a threshold, power supply of the air purifier is cut off.

[0032] Based on the above technical solutions, the present disclosure may at least fulfill the following technical effects:

[0033] 1. By optimizing the design of the air inlet channel, the air purifier will collect the pet hair in the hair collecting box in an intake process;

[0034] 2. By dividing the hair collecting box into the hair collecting channel and the accommodating space by the dividing wall, the pet hair entering the accommodating space will not be sucked back into the air inlet channel;

[0035] 3. Since the flow rate of a fluid is increased and the pressure thereof is reduced when the fluid passes through a narrowed channel, the bore of the hair collecting channel is set to be gradually decreased from the first inlet to the second inlet, so that the pet hair is concentrated toward the second inlet through the hair collecting channel;

[0036] 4. The bore of the air inlet channel is set to be gradually decreased from the air inlet to the first inlet, so that the pet hair is concentrated toward the first inlet through the air inlet channel;

[0037] 5. The recess is provided at the position of the air inlet channel adjacent to the first inlet, so that the pet hair is likely to be concentrated at the recess and enters the first inlet;

[0038] 6. The storage box is provided on the upper shell, so that the storage space of the purifier is increased to store food rations of pets, cleaning articles, and the like;

[0039] 7. The tray is provided at the top of the outer shell, so that the pet may have a rest on the tray; the heating element is provided on the tray to heat a pet blanket;

[0040] 8. After the air purifier collects a part of hair, hair and impurities are adsorbed to the surface of the filter cartridge, so that the discharge quantity of air is affected; by providing the sensor system, when the weight of the air purifier reaches the first threshold, the wind wheel is switch to the high rotating speed to compensate for the discharge quantity of air.BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0041] FIG. 1 is a schematic diagram of an air purifier for collecting pet hair.

[0042] FIG. 2 is a schematic diagram of the air purifier for collecting pet hair from another perspective.

[0043] FIG. 3 is a sectional view of the air purifier for collecting pet hair.

[0044] FIG. 4 is a schematic diagram of the air purifier for collecting pet hair without a tray and an upper shell.

[0045] FIG. 5 is an exploded view of a lower shell, a middle frame, a filter cartridge, and an inner shell in the air purifier for collecting pet hair.

[0046] In the figures, 100, lower shell; 110, air inlet; 120, accommodating groove; 130, air inlet channel; 131, first side wall; 132, second side wall; 133, recess; 140, bearing block; 200, hair collecting box; 210, hair collecting channel; 211, first inlet; 212, second inlet; 220, accommodating space; 230, dividing wall; 300, middle frame; 310, clamping groove; 400, inner shell; 410, air grid; 420, mounting base; 500, upper shell; 510, air outlet; 520, storage box; 521, button; 522, hook; 600, volute casing; 700, wind wheel; 800, filter cartridge; 900, tray.DETAILED DESCRIPTION OF THE INVENTION

[0047] It should be noted that all directional indications (for example, upper, lower, left, right, front, back, and the like) in the embodiments of the present disclosure are merely used for explaining relative position relations, moving conditions, and the like among components in a certain special gesture (as shown in the drawings). If the special gesture changes, the directional indications change correspondingly. In addition, the descriptions of “first”, “second”, and the like in the present disclosure are used for the purpose of description only, but cannot be understood as indicating or implying the relative importance thereof or implicitly indicating the number of the indicated technical features. Thus, features defining “first” and “second” may expressively or implicitly include at least one feature. In the description of the present disclosure, unless otherwise specified, “a plurality of” means at least two, for example, two, three and the like. In the present disclosure, unless otherwise expressly stated and defined, the terms “connect”, “fix” and the like shall be understood in a broad sense, for example, “fix” may be fixed connection or detachable connection or integrated connection; it may be mechanical connection or electrical connection; it may be direct connection or indirect connection via an intermediate, or it may be internal connection or interaction of two components, unless otherwise specified. Those of ordinary skill in the art may understand the specific meaning of the terms in the present disclosure under specific circumstances. In addition, the technical solutions of the embodiments of the present disclosure may be combined based on implementation by those of ordinary skill in the art. When the technical solutions contradict each other in combination or may not be realized, it is to be considered that there is no combination of the technical solutions, which shall not fall into the protection scope of the present disclosure.

[0048] The following is specific embodiments of the present disclosure and the technical solutions of the present disclosure are further described in conjunction with FIGS. 1-5. However, the present disclosure is not limited to the following embodiments.

[0049] An air purifier for collecting pet hair, used for collecting impurities such as particulates and pet hair around the air purifier, including an outer shell and a hair collecting box 200, where an air inlet 110 is provided on a side surface of the outer shell, and an accommodating groove 120 is provided at a position adjacent to the air inlet 110. The hair collecting box 200 is provided in the accommodating groove 120, an external contour of the hair collecting box 200 fits the size of the accommodating groove 120, a first inlet 211 is provided in one side of the hair collecting box 200 proximal to the interior of the air purifier, an air inlet channel 130 is provided inside the outer shell, and the air inlet channel 130 is connected to the air inlet 110 and the first inlet 211 respectively. A side wall of the air inlet channel 130 is at least configured to form a part of the accommodating groove 120, and when the air purifier works, the pet hair enters the hair collecting box 200 through the air inlet 110, the air inlet channel 130, and the first inlet 211 in sequence.

[0050] It should be noted that the side surface of the outer shell refers to another surface except the top surface and the bottom surface of the outer shell. One side of the hair collecting box 200 proximal to the interior of the air purifier refers to one side away from the surface of the air purifier when the hair collecting box 200 is located at a mounting position. In this embodiment, the air inlet channel 130 extends in a clockwise direction in a bent manner and includes a first side wall 131 and a second side wall 132. The first side wall 131 is provided as a cambered surface and forms at least a part of the accommodating groove 120. The second side wall 132 has a planar section and a cambered section connected to each other. The first side wall 131 is designed into an involute cambered surface and matches with a composite structure of the plane and the cambered surface of the second side wall 132 to form a spiral air flow accelerating effect. By optimizing the design of the air inlet channel 130, the air purifier will collect the pet hair in the hair collecting box 200 in an intake process.

[0051] The hair collecting box 200 includes a hair collecting channel 210 and an accommodating space 220. The hair collecting channel 210 and the accommodating space 220 are divided by a dividing wall 230. Two ends of the hair collecting channel 210 are a first inlet 211 and a second inlet 212, respectively. The second inlet 212 is connected to the accommodating space 220. In this embodiment, the hair collecting box 200 is slidably connected to the accommodating groove 120. When the hair collecting box 200 is filled with the pet hair, the hair collecting box 200 may be pulled out by a user from the accommodating groove 120 to be cleaned. By dividing the hair collecting box 200 into the hair collecting channel 210 and the accommodating space 220 by the dividing wall 230, the pet hair entering the accommodating space 220 will not be sucked back into the air inlet channel 130.

[0052] Preferably, a channel bore of the hair collecting channel 210 decreases gradually in a direction from the first inlet 211 to the second inlet 212. Since the flow rate of a fluid is increased and the pressure thereof is reduced when the fluid passes through a narrowed channel, the bore of the hair collecting channel 210 is set to be gradually decreased from the first inlet 211 to the second inlet 212, so that the pet hair is concentrated toward the second inlet 212 through the hair collecting channel 210.

[0053] Preferably, in this embodiment, the dividing wall 230 and a side wall of the hair collecting box 200 are provided as a whole.

[0054] Preferably, a channel bore of the air inlet channel 130 decreases gradually in a direction from the air inlet 110 to the first inlet 211. The bore of the air inlet channel 130 is set to be gradually decreased from the air inlet 110 to the first inlet 211, so that the pet hair is concentrated toward the first inlet 211 through the air inlet channel 130.

[0055] A downward recess 133 is provided at a position of the air inlet channel 130 adjacent to the first inlet 211. In this embodiment, at the position adjacent to the first inlet 211, the width of the recess 133 is equivalent to the width of the first inlet 211. In a direction away from the first inlet 211, the width of the recess 133 decreases gradually to a small extent. The recess 133 is provided at the position of the air inlet channel 130 adjacent to the first inlet 211, so that the pet hair is likely to be concentrated at the recess 133 and enters the first inlet 211.

[0056] Specifically, the air purifier for collecting pet hair provided by the present disclosure further includes a middle frame 300 and an inner shell 400, where the outer shell includes an upper shell 500 and a lower shell 100, the middle frame 300 is provided on the lower shell 100, the inner shell 400 is provided on the middle frame 300, and the upper shell 500 is detachably connected to the inner shell 400.

[0057] The air inlet 110 is provided in a side surface of the lower shell 100 and a bottom of the air inlet 110 is flush with a bottom of the lower shell 100. A guide plate is provided on the air inlet 110. In this embodiment, the guide plate is unadjustable. In other implementations, an adjustable guide plate may also be provided. The bottom of the air inlet 110 is provided flush with the bottom of the lower shell 100, so that the pet hair around the air purifier is sucked into the air inlet 110.

[0058] Specifically, the air purifier for collecting pet hair provided by the present disclosure further includes a filter cartridge 800 and a power device. The filter cartridge 800 and the power device are provided above the air inlet channel 130 in sequence. A hollow mounting position for the filter cartridge 800 is provided on the middle frame 300, the filter cartridge 800 is mounted on the middle frame 300, and the filter cartridge 800 is provided in a mounting space enclosed by the middle frame 300 and the inner shell 400. The filter cartridge 800 is provided in the mounting space enclosed by the middle frame 300 and the inner shell 400, so that the filter cartridge 800 is mounted stably. When the pet plays on the air purifier, the filter cartridge 800 does not fall off.

[0059] The power device includes a volute casing 600 and a wind wheel 700 provided in the volute casing 600. The wind wheel 700 is driven by a motor (not shown in the figures) provided in the wind wheel 700, the volute casing 600 is provided at the top of the inner shell 400, an air grid 410 is provided at the top of the inner shell 400, and the air inlet channel 130 is connected to the volute casing 600 through the air grid 410. An air outlet 510 is provided in the side surface of the upper shell 500, the volute casing 600 is connected to the air outlet 510, and an orientation of the air outlet 510 is different from an orientation of the air inlet 110.

[0060] Preferably, a negative-ion generator is provided on the air outlet 510, so that the air purifier is capable of better purifying air, sterilizing, and removing odors, so as to further improve the air quality.

[0061] After the wind wheel 700 of the air purifier for collecting pet hair provided by the present disclosure operates, intake is performed from the air inlet 110, and then air passing through the air inlet channel 130, the filter cartridge 800, and the volute casing 600 in sequence is discharged from the air outlet 510. In this embodiment, an orientation of the air outlet 510 is perpendicular to an orientation of the air inlet 110. An air outlet grid is provided on the air outlet 510 and may adjust the air outlet angle.

[0062] The air purifier for collecting pet hair provided by the present disclosure further includes a storage box 520, where the storage box 520 is provided on the upper shell 500 and is detachably connected to the middle frame 300. Specifically, a button 521 is provided on a surface, facing outward, of the storage box 520, a hook 522 is connected to the button 521, a clamping groove 310 is provided at a corresponding position of the middle frame 300, and the hook 522 is in snap fit with the clamping groove 310. When the storage box 520 is detached, the button 521 is pressed and the hook 522 is separated from the clamping groove 310, so that the storage box 520 is separated from the middle frame 300. The storage box 520 is detachably connected to the middle frame 300, so that it is convenient to mount and detach the storage box 520.

[0063] Preferably, in the air purifier for collecting pet hair provided by the present disclosure, a tray 900 is provided at the top of the outer shell, a plurality of mounting columns are provided on a bottom surface of the tray 900, a plurality of mounting bases 420 are provided at corresponding positions of the top surface of the inner shell 400, and the mounting columns are inserted into the mounting bases 420. A heating element is provided on the tray 900. The tray 900 is provided at the top of the outer shell, so that the pet may have a rest on the tray 900. The heating element is provided on the tray 900 to heat a pet blanket.

[0064] The air purifier for collecting pet hair provided by the present disclosure further includes a sensor system, configured to detect the weight of the air purifier. In this embodiment, a bearing block 140 is provided at the bottom of the lower shell, a pressure sensor is provided in the bearing block 140, and the weight of the air purifier may be calculated according to a pressure borne by the bearing block 140.

[0065] When the weight of the air purifier reaches a first threshold, the wind wheel 700 is switched to a higher rotating speed. After the air purifier collects a part of hair, hair and impurities are adsorbed to the surface of the filter cartridge 800, so that the discharge quantity of air is affected. By providing the sensor system, when the weight of the air purifier reaches the first threshold, the wind wheel 700 is switched to high rotating speed to compensate for the discharge quantity of air.

[0066] When the weight of the air purifier reaches a second threshold that is greater than the first threshold, the wind wheel 700 stops working. When the weight of the air purifier reaches the second threshold, there is an excess of hair and impurities in the air purifier and it is needed to clean the air purifier. Therefore, the air purifier will be shut down automatically to avoid overload operation of the air purifier.

[0067] The sensor system of the air purifier for collecting pet hair provided by the present disclosure is further configured to detect a movement feature value of the air purifier such as a displacement, a velocity, and an acceleration, and to cut off power supply of the air purifier when it is detected that the movement feature value of the air purifier reaches a threshold. By detecting the movement feature value of the air purifier, when the user moves the air purifier or the pet collides with the air purifier, the air purifier is powered off to protect the safety of the user and the pet, and moreover, the air purifier is prevented from being damaged.

[0068] The specific embodiments described herein are merely illustrations of the spirit of the present disclosure. Those skilled in the art may make various modifications or supplementations on the specific embodiments described or replace the modifications or supplementations in a similar manner, without departing from the spirit of the present disclosure or surpassing the scope defined by the appended claims.

Claims

1. An air purifier for collecting pet hair, comprising:an outer shell, wherein an air inlet is provided in a side surface of the outer shell, and an accommodating groove is provided at a position adjacent to the air inlet;a hair collecting box, provided in the accommodating groove, wherein a first inlet is provided in a side, proximal to an interior of the air purifier, of the hair collecting box; andan air inlet channel, provided inside the outer shell and connected to the air inlet and the first inlet respectively,wherein a side wall of the air inlet channel is at least configured to form a part of the accommodating groove, and when the air purifier works, pet hair enters the hair collecting box through the air inlet, the air inlet channel, and the first inlet in sequence.

2. The air purifier for collecting pet hair according to claim 1, wherein the hair collecting box comprises a hair collecting channel and an accommodating space, the hair collecting channel and the accommodating space are divided by a dividing wall, two ends of the hair collecting channel are respectively a first inlet and a second inlet, and the second inlet is connected to the accommodating space.

3. The air purifier for collecting pet hair according to claim 2, wherein a channel bore of the hair collecting channel decreases gradually in a direction from the first inlet to the second inlet.

4. The air purifier for collecting pet hair according to claim 3, wherein the dividing wall and a side wall of the hair collecting box are provided as a whole.

5. The air purifier for collecting pet hair according to claim 1, wherein a channel bore of the air inlet channel decreases gradually in a direction from the air inlet to the first inlet.

6. The air purifier for collecting pet hair according to claim 5, wherein a downward recess is provided at a position of the air inlet channel adjacent to the first inlet.

7. The air purifier for collecting pet hair according to claim 5, further comprising a middle frame and an inner shell, wherein the outer shell further comprises an upper shell and a lower shell, the middle frame is provided on the lower shell, the inner shell is provided on the middle frame, and the upper shell is detachably connected to the inner shell.

8. The air purifier for collecting pet hair according to claim 7, further comprising a filter cartridge and a power device, wherein the filter cartridge and the power device are provided above the air inlet channel in sequence, and the filter cartridge is provided in a mounting space enclosed by the middle frame and the inner shell.

9. The air purifier for collecting pet hair according to claim 7, wherein the air inlet is provided in a side surface of the lower shell and a bottom of the air inlet is flush with a bottom of the lower shell.

10. The air purifier for collecting pet hair according to claim 8, wherein the power device comprises a volute casing and a wind wheel provided in the volute casing, the volute casing is provided at a top of the inner shell, an air grid is provided at the top of the inner shell, and the air inlet channel is connected to the volute casing through the air grid.

11. The air purifier for collecting pet hair according to claim 10, wherein an air outlet is provided in the side surface of the upper shell, the volute casing is connected to the air outlet, and an orientation of the air outlet is different from an orientation of the air inlet.

12. The air purifier for collecting pet hair according to claim 11, wherein the orientation of the air outlet is perpendicular to the orientation of the air inlet.

13. The air purifier for collecting pet hair according to claim 11, wherein the air outlet is provided with a negative-ion generator.

14. The air purifier for collecting pet hair according to claim 7, further comprising a storage box, wherein the storage box is provided on the upper shell and is detachably connected to the middle frame.

15. The air purifier for collecting pet hair according to claim 14, wherein a button is provided on a surface, facing outward, of the storage box, a hook is connected to the button, a clamping groove is provided at a corresponding position of the middle frame, and the hook is snap fit with the clamping groove.

16. The air purifier for collecting pet hair according to claim 7, wherein a tray is provided at a top of the outer shell, a plurality of mounting columns are provided on a bottom surface of the tray, a plurality of mounting bases are provided at corresponding positions of a top surface of the inner shell, and the mounting columns are inserted into the mounting bases.

17. The air purifier for collecting pet hair according to claim 16, wherein a heating element is provided on the tray.

18. The air purifier for collecting pet hair according to claim 10, further comprising a sensor system, wherein the sensor system is configured to detect a weight of the air purifier, and when the weight of the air purifier reaches a first threshold, the wind wheel is switched to a higher rotating speed.

19. The air purifier for collecting pet hair according to claim 18, wherein when the weight of the air purifier reaches a second threshold that is greater than the first threshold, the wind wheel stops working.

20. The air purifier for collecting pet hair according to claim 1, further comprising a sensor system, wherein the sensor system is configured to detect a movement of the air purifier, and when it is detected that the movement of the air purifier reaches a threshold, power supply of the air purifier is cut off.