Air suspension centrifugal blower

By using a connecting device to drive the filter to move in the blower, the problem of poor cleaning effect of the filter in the prior art is solved, and the filter is replaced without stopping, ensuring air quality and air intake.

CN119532252APending Publication Date: 2025-02-28江西金德铅业股份有限公司
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Patent Information

Application Number
CN202411372505.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-29
Publication Date
2025-02-28

AI Technical Summary

Technical Problem

In the prior art, there is a problem of poor cleaning effect on the blower filter screen, which leads to insufficient air inlet for the blower.

Method used

An air suspension centrifugal blower is designed, and a connecting device is used to drive the filter screen for movement, so that the saturated filter screen part is replaced with a clean part, thereby achieving continuous filtration of the air.

Benefits of technology

It realizes that the filter screen can be replaced without shutting down, ensuring the air quality and air inlet volume entering the body.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses an air suspension centrifugal blower, which relates to the technical field of blowers, and comprises a blower body with an input end, a shell, a filter screen and a linkage device, the shell is used for being communicated with the input end and comprises at least one first face part and at least one second face part, the first face part is opposite to the input end, and the second face part is adjacent to the first face part; wherein the filter screen is arranged in the shell through the linkage device, one part of the filter screen is opposite to the first face part, and the other part of the filter screen is opposite to the second face part, so that when the filter medium on the part, opposite to the first face part, of the filter screen is saturated, the second face part of the filter screen is saturated; the linkage device drives the filter screen to move, so that the part, opposite to the second face part, of the filter screen is switched to the part, opposite to the first face part, of the filter screen, replacement of the part, for filtering air, of the filter screen is completed under the condition that a machine is not stopped, and the air entering the machine body and the air inlet amount are guaranteed.
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Description

Technical Field

[0001] The invention relates to the technical field of blowers, in particular to an air suspension centrifugal blower. Background Art

[0002] Most of the lead-zinc mineral raw materials are lead-zinc ore coexistence, and it is difficult to achieve complete separation of lead and zinc through preferential flotation. Lead-zinc ore smelting is to enrich zinc in slag, and then use a fuming furnace to treat the slag to produce zinc oxide or secondary zinc oxide. In order to improve the slag blowing effect, better control the furnace temperature, and achieve the purpose of reducing the zinc content of the abandoned slag, the existing technology generally uses a fuming furnace in conjunction with a blower.

[0003] At present, in order to prevent dust in the environment from entering the blower, the existing technology blowers usually set a filter net or other filtering components at the air inlet of the blower to filter and purify the air entering the body, so as to prevent the dust in the air from accumulating on the impeller of the blower, resulting in a decrease in the blowing effect of the blower and even damage to the impeller. However, if the blower is used for a long time, the dust on the filter net will be saturated, resulting in insufficient air intake when the blower is running. For this reason, in the existing technology, a cleaning mechanism is usually arranged on the filter net, and the dust on the filter net is cleaned by the cleaning mechanism to ensure the air intake of the blower during operation.

[0004] However, due to the irregular size of dust particles, some dust particles will be directly embedded in the filter holes of the filter, making it difficult for the cleaning mechanism to clean the dust particles in the filter holes, thereby affecting the air intake of the blower. Therefore, the existing cleaning method of the filter has the disadvantage of poor cleaning effect. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide an air-suspended centrifugal blower to solve the technical problem that the existing cleaning method of the filter screen in the background technology has poor cleaning effect.

[0006] The present invention provides an air suspension centrifugal blower, comprising a body with an input end, a shell, a filter screen and a linkage device;

[0007] The housing is used to communicate with the input end, and the housing includes at least one first surface and at least one second surface, the first surface is opposite to the input end, and the second surface is adjacent to the first surface;

[0008] Wherein, the filter screen is arranged in the shell through the linkage device, and a part of the filter screen is opposite to the first surface part, and another part of the filter screen is arranged opposite to the second surface part, so that when the filter medium on the part of the filter screen opposite to the first surface part is saturated, the filter screen is driven to move by the linkage device to switch the part of the filter screen opposite to the second surface part to be opposite to the first surface part.

[0009] Furthermore, the blower further comprises at least one partition plate group;

[0010] The partition plate group is arranged in the shell, so as to divide the shell into at least one transmission channel opposite to the first surface and at least one accommodation channel opposite to the second surface through the partition plate group;

[0011] Wherein, a portion of the filter screen opposite to the second surface portion is arranged in the accommodating channel.

[0012] Further, the partition plate group includes at least one first partition plate and at least one second partition plate;

[0013] The first partition plate and the second partition plate are arranged opposite to each other in the shell, and a portion of the first partition plate is bent and extended toward the shell and then extends toward the first surface portion, so that a turning channel is formed between the first partition plate and the second partition plate, and the turning channel is used to connect the transmission channel and the accommodating channel to each other.

[0014] Furthermore, the second surface portion is also provided with an air outlet notch portion opposite to the turning channel.

[0015] Further, the first partition plate includes a first sub-portion, a second sub-portion and a third sub-portion, the first sub-portion is arranged opposite to the second partition plate, the second sub-portion is bent toward the inside of the shell, and the third sub-portion extends toward the first surface portion;

[0016] Wherein, the third sub-portion is parallel to the second partition plate.

[0017] Furthermore, the size of one end of the third sub-section away from the second sub-section gradually decreases from large.

[0018] Furthermore, the linkage device comprises at least four rotating rollers, and a linkage assembly for driving at least two of the rotating rollers to move synchronously;

[0019] Wherein, the two ends of the filter screen are respectively connected to the two rotating rollers close to the linkage assembly, and the middle part of the filter screen is respectively against the other two rotating rollers.

[0020] Further, the linkage device includes a first rotating roller, a second rotating roller, a third rotating roller and a fourth rotating roller;

[0021] The first rotating roller and the second rotating roller are connected by the linkage assembly, and the two ends of the filter are respectively connected to the first rotating roller and the second rotating roller, and the middle of the filter is respectively against the third rotating roller and the fourth rotating roller.

[0022] Furthermore, the linkage assembly includes two gears, a toothed chain respectively linked to the two gears, and a driving member for driving at least one gear to rotate;

[0023] Wherein, the two gears are connected to the first rotating roller and the second rotating roller respectively.

[0024] Furthermore, the blower further comprises a wind speed detector and a control terminal, wherein the wind speed detector is arranged on the housing, and a detection end of the wind speed detector faces the input end, so as to detect air flow rate data entering the input end;

[0025] Wherein, the control terminal is electrically connected to the wind speed detector, the body and the driving member. When the air flow rate data is less than a preset threshold, the control terminal controls the driving member to drive one of the gears to rotate, so as to switch a part of the filter opposite to the second face portion to opposite to the first face portion.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] In an air suspension centrifugal blower provided by the present invention, the first face of the shell is opposite to the input end of the body, so that the air entering the body will be input by the first face, and the dust in the air can be filtered by the part of the filter opposite to the first face, so as to prevent the dust in the air from adhering to the parts in the body, such as the impeller in the body, and to ensure the sustainable filtration of the filter, there is also a part of the filter opposite to the second face, that is, when the dust on the part of the filter opposite to the first face is saturated, the filter is driven to move by a linkage device, so that the part of the filter covered with dust is moved, and the part of the filter corresponding to the second face is moved to correspond to the first face, so that the air is filtered through the part of the filter, thereby changing the dust cleaning method on the filter in the prior art, and completing the replacement of the part of the filter that filters the air without stopping the machine, thereby ensuring the air entering the body and the air intake. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1A three-dimensional diagram of an air suspension centrifugal blower according to an embodiment of the present invention;

[0029] Figure 2 is a three-dimensional diagram of a housing in one embodiment of the present invention;

[0030] Figure 3 is a sectional perspective view of a housing in one embodiment of the present invention;

[0031] Figure 4 A rear view of a housing in one embodiment of the present invention;

[0032] Figure 5 for Figure 4 AA section view;

[0033] Figure 6 It is a schematic diagram of the operating state of the housing in one embodiment of the present invention;

[0034] Figure 7 Schematic diagram of the structure of a linkage assembly in one embodiment of the present invention.

[0035] Reference numerals

[0036] In the figure: 100, machine body; 110, input end; 200, shell; 210, first face; 220, second face; 230, air outlet notch; 300, filter; 400, linkage device; 410, first rotating roller; 420, second rotating roller; 430, third rotating roller; 440, fourth rotating roller; 450, linkage assembly; 451, gear; 452, tooth chain; 453, driving member; 500, partition plate group; 510, first partition plate; 511, first sub-section; 512, second sub-section; 513, third sub-section; 520, second partition plate; 600, transmission channel; 700, accommodating channel; 800, steering channel; 900, wind speed detector; 1000, control terminal. DETAILED DESCRIPTION

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0038] In addition, the term "and / or" as used herein includes any and all combinations of one or more related listed items. In the detailed description and claims, a list of items connected by the term "one of" may mean any of the listed items. For example, if items A and B are listed, the phrase "one of A and B" means only A or only B. In another example, if items A, B, and C are listed, the phrase "one of A, B, and C" means only A; only B; or only C. Item A may contain a single element or multiple elements. Item B may contain a single element or multiple elements. Item C may contain a single element or multiple elements. In the detailed description and claims, a list of items connected by the terms "one of - less than one", "one of - less than one" or other similar terms may mean any combination of the listed items. For example, if items A and B are listed, the phrase "one of - less than one of A and B" or "one of - less than one of A or B" means only A; only B; or A and B. In another example, if items A, B, and C are listed, the phrase "less than one of A, B, and C" or "less than one of A, B, or C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may include a single element or multiple elements. Item B may include a single element or multiple elements. Item C may include a single element or multiple elements.

[0039] See also Figure 1-Figure 7 As shown, the present invention provides an air suspension centrifugal blower, including a body 100 with an input end 110. In the present embodiment, the body 100 is the blower body, and the components constituting the blower belong to the conventional prior art in the field, so they are not specifically described here. Since the blower needs to filter the air entering the body 100 during operation, the blower provided in the present embodiment also includes a shell 200, a filter screen 300 and a linkage device 400.

[0040] Specifically, the housing 200 is used to communicate with the input end 110, and the housing 200 includes at least one first surface 210 and at least one second surface 220, the first surface 210 is opposite to the input end 110, and the second surface 220 is adjacent to the first surface 210;

[0041] Among them, the filter net 300 is arranged in the shell 200 through the linkage device 400, and a part of the filter net 300 is opposite to the first surface 210, and another part of the filter net 300 is arranged opposite to the second surface 220, so that when the filter medium on the part of the filter net 300 opposite to the first surface 210 is saturated, the filter net 300 is driven to move through the linkage device 400 to switch the part of the filter net 300 opposite to the second surface 220 to be opposite to the first surface 210.

[0042] That is, the first face portion 210 is opposite to the input end 110, so that the air entering the machine body 100 will be input through the first face portion 210, and the part of the filter 300 opposite to the first face portion 210 can filter the dust in the air, thereby preventing the dust in the air from adhering to the parts in the machine body 100, such as the impeller in the machine body 100, and in order to ensure the sustainable filtering of the filter 300, in the embodiment, there is also a part of the filter 300 opposite to the second face portion 220, that is, when the part of the filter 300 opposite to the first face portion 210 is When the dust is saturated, the linkage device 400 is used to drive the filter 300 to move, so that the part of the filter 300 covered with dust is moved, and the part of the filter 300 corresponding to the second face 220 is moved to correspond to the first face 210, so that the air is filtered through this part of the filter 300, thereby changing the dust cleaning method on the filter 300 in the prior art, and completing the replacement of the part of the filter 300 that filters the air without stopping the machine, thereby ensuring the air entering the body 100 and the air intake.

[0043] For a better understanding of this case, please refer to Figure 3 As shown, the filter net 300 is a flexible long strip filter net 300, and the filter net 300 is distributed around the three surfaces of the shell 200. Specifically, the shell 200 is arranged as a rectangular body, with two second face parts 220 and one first face part 210, and the two second face parts 220 are symmetrical, that is, the filter net 300 extends from the first second face part 220 toward the first face part 210, and then extends toward the second second face part 220, and the filter net 300 can be wound around the rotating roller in the linkage device 400.

[0044] Specifically, the linkage device 400 includes at least four rotating rollers and a linkage assembly 450 for driving at least two rotating rollers to move synchronously, wherein the two ends of the filter net 300 are respectively connected to the two rotating rollers close to the linkage assembly 450, and the middle of the filter net 300 is respectively against the other two rotating rollers.

[0045] In some embodiments, the linkage device 400 includes a first rotating roller 410, a second rotating roller 420, a third rotating roller 430 and a fourth rotating roller 440, wherein the first rotating roller 410 and the second rotating roller 420 are connected by a linkage assembly 450, and the two ends of the filter net 300 are respectively connected to the first rotating roller 410 and the second rotating roller 420, and the middle part of the filter net 300 is respectively against the third rotating roller 430 and the fourth rotating roller 440.

[0046] It should be noted that the first rotating roller 410 , the second rotating roller 420 , the third rotating roller 430 and the fourth rotating roller 440 are not limited to the number of rotating rollers, and may also include other numbers of rotating rollers, such as five, six, etc., which are not specifically explained here.

[0047] Specifically, the first rotating roller 410, the second rotating roller 420, the third rotating roller 430 and the fourth rotating roller 440 can be distributed at each end of the shell 200, and after multiple turns of the filter net 300 are wound around the first rotating roller 410, the other end of the filter net 300 can be passed through the second rotating roller 420 and the third rotating roller 430 in sequence and then connected to the fourth rotating roller 440, so that when the filter net 300 moves, a sufficient length of the filter net 300 moves toward the first surface 210.

[0048] To facilitate driving the filter screen 300 to move, in an embodiment, the linkage assembly 450 includes two gears 451, a toothed chain 452 respectively linked to the two gears 451, and a driving member 453 for driving at least one gear 451 to rotate, wherein the two gears 451 are respectively connected to the first rotating roller 410 and the second rotating roller 420.

[0049] It should be noted that the driving member 453 can adopt a servo motor in the prior art, and the gear 451 is a spur gear 451, that is, a gear 451 is driven to rotate by the driving member 453, so that under the transmission of the toothed chain 452, the other gear 451 rotates synchronously, that is, the first rotating roller 410 and the second rotating roller 420 rotate in the same direction at the same time, so that the part of the filter screen 300 corresponding to the first face 210 can move toward the direction of the first second face 220, and the filter screen 300 corresponding to the second second face 220 moves toward the direction of the first face 210, and the part of the filter screen 300 corresponding to the second second face 220 is facing the first face 210 to complete the filtering of dust in the air.

[0050] In some preferred embodiments, the housing 200 can be detachably connected to the input end 110 of the body 100 via a flange, thereby facilitating subsequent replacement of the filter screen 300 or routine maintenance of the linkage device 400 .

[0051] Furthermore, after the filter 300 moves, a large amount of dust exists on the portion of the filter 300 moving toward the second face portion 220. To ensure that the filter 300 can filter for a long time, in some other preferred implementations, the blower also includes at least one partition plate group 500, and the partition plate group 500 is disposed in the shell 200, so as to divide the shell 200 into at least one transmission channel 600 opposite to the first face portion 210, and at least one accommodating channel 700 opposite to the second face portion 220 through the partition plate group 500, wherein a portion of the filter 300 opposite to the second face portion 220 is disposed in the accommodating channel 700.

[0052] Specifically, the partition plate group 500 includes at least one first partition plate 510 and at least one second partition plate 520. The first partition plate 510 and the second partition plate 520 are arranged opposite to each other in the shell 200, and a portion of the plate body of the first partition plate 510 is bent and extended toward the shell 200 and extends toward the first face portion 210, so that a turning channel 800 is formed between the first partition plate 510 and the second partition plate 520. The turning channel 800 is used to connect the transmission channel 600 and the accommodating channel 700 to each other.

[0053] See also Figure 6 As shown, the filtered air enters the input end 110 through the transmission channel 600. Since part of the plate body in the first partition plate 510 is bent and extended toward the shell 200 and extends toward the first face 210, the filtered air will be divided into two airflows through the first partition plate 510. The first airflow enters the input end 110 through the transmission channel 600, and the second airflow is transmitted toward the accommodating channel 700 through the turning channel 800. The second airflow is used to remove part of the dust and the part of the filter 300 located in the accommodating channel 700 output the second airflow. The second airflow can be used to clean the dust attached to the outside of the part of the filter 300 to ensure the cleaning effect.

[0054] Specifically, the filter 300 is divided into an inner side and an outer side. When the filter 300 filters the air, the dust in the air will adhere to the outer side of the filter 300, and the second airflow is output toward the inner side of the filter 300, that is, through the unidirectional output, the dust is cleaned from the filter 300. During the output process, the second airflow can directly clean the dust in the filter 300 and on the filter holes, thereby realizing the recycling of the filter 300.

[0055] In some preferred embodiments, the second surface portion 220 is further provided with an air outlet notch portion 230 opposite to the turning channel 800. Through the air outlet notch portion 230, the dust attached to the outside of the filter 300 can be discharged from the side wall of the shell 200 to achieve dust processing.

[0056] In some practical situations, a collection frame may be arranged outside the housing 200 to collect the dust in a unified manner.

[0057] In addition, the first partition plate 510 includes a first sub-portion 511, a second sub-portion 512 and a third sub-portion 513. The first sub-portion 511 is arranged opposite to the second partition plate 520, the second sub-portion 512 is bent toward the shell 200, and the third sub-portion 513 extends toward the first face portion 210, wherein the third sub-portion 513 is parallel to the second partition plate 520, and the size of the end of the third sub-portion 513 away from the second sub-portion 512 gradually decreases from large.

[0058] In addition, the blower further includes a wind speed detector 900 and a control terminal 1000. The wind speed detector 900 is disposed in the housing 200, and the detection end of the wind speed detector 900 faces the input end 110, so as to detect the air flow rate data entering the input end 110.

[0059] Among them, the control terminal 1000 is electrically connected to the wind speed detector 900, the body 100 and the driving member 453. When the air flow rate data is less than a preset threshold, the control terminal 1000 controls the driving member 453 to drive a gear 451 to rotate, so as to switch a part of the filter 300 opposite to the second face 220 to opposite to the first face 210.

[0060] In some optional embodiments, the control terminal 1000 can adopt a PLC microcontroller, and the air flow rate data entering the body 100 can be limited according to the control terminal 1000, that is, the air flow rate data entering the body 100 is detected using the wind speed detector 900. When the flow rate data is less than a preset threshold, the control terminal 1000 will control the driving component 453 to operate, thereby driving the filter 300 to move.

[0061] It should be noted that the driving member 453 performs forward operation, that is, after the filter 300 completes the first forward movement, the control terminal 1000 can control the driving member 453 to perform reverse operation, so that when the filter 300 performs the second movement, the filter 300 realizes reverse movement.

[0062] In summary, the air suspension centrifugal blower provided in the first embodiment of the present invention has at least the following beneficial effects compared with the traditional method of cleaning the filter:

[0063] In an air suspension centrifugal blower provided by the present invention, the first face portion 210 is opposite to the input end 110, so that the air entering the body 100 will be input by the first face portion 210, and the part of the filter 300 opposite to the first face portion 210 can be used to filter the dust in the air, thereby preventing the dust in the air from adhering to the parts in the body 100, such as the impeller in the body 100, and in order to ensure the sustainable filtration of the filter 300, in the embodiment, there is also a part of the filter 300 opposite to the second face portion 220, that is, when the part opposite to the first face portion 210 When part of the filter 300 is saturated with dust, the linkage device 400 is used to drive the filter 300 to move, so that the part of the filter 300 covered with dust is moved, and the part of the filter 300 corresponding to the second face 220 is moved to correspond to the first face 210, so that the air is filtered through the part of the filter 300, thereby changing the dust cleaning method on the filter 300 in the prior art, and completing the replacement of the part of the filter 300 that filters the air without stopping the machine, thereby ensuring the air entering the body 100 and the air intake.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0065] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. An air suspension centrifugal blower, characterized in that: It includes a body with an input end, a shell, a filter screen and a linkage device; The housing is used to communicate with the input end, and the housing includes at least one first surface and at least one second surface, the first surface is opposite to the input end, and the second surface is adjacent to the first surface; Wherein, the filter screen is arranged in the shell through the linkage device, and a part of the filter screen is opposite to the first surface part, and another part of the filter screen is arranged opposite to the second surface part, so that when the filter medium on the part of the filter screen opposite to the first surface part is saturated, the filter screen is driven to move by the linkage device to switch the part of the filter screen opposite to the second surface part to be opposite to the first surface part.

2. The air suspension centrifugal blower according to claim 1, characterized in that: The blower further comprises at least one partition plate set; The partition plate group is arranged in the shell, so as to divide the shell into at least one transmission channel opposite to the first surface and at least one accommodation channel opposite to the second surface through the partition plate group; Wherein, a portion of the filter screen opposite to the second surface portion is arranged in the accommodating channel.

3. The air suspension centrifugal blower according to claim 2, characterized in that: The partition plate group includes at least one first partition plate and at least one second partition plate; The first partition plate and the second partition plate are arranged opposite to each other in the shell, and a portion of the first partition plate is bent and extended toward the shell and then extends toward the first surface portion, so that a turning channel is formed between the first partition plate and the second partition plate, and the turning channel is used to connect the transmission channel and the accommodating channel to each other.

4. The air suspension centrifugal blower according to claim 3, characterized in that: The second surface portion is also provided with an air outlet notch portion opposite to the turning channel.

5. The air suspension centrifugal blower according to claim 3, characterized in that: The first partition plate includes a first sub-portion, a second sub-portion and a third sub-portion, the first sub-portion is arranged opposite to the second partition plate, the second sub-portion is bent toward the inside of the shell, and the third sub-portion extends toward the first face portion; Wherein, the third sub-portion is parallel to the second partition plate.

6. The air suspension centrifugal blower according to claim 5, characterized in that: The size of one end of the third sub-section away from the second sub-section gradually decreases from large to small.

7. The air suspension centrifugal blower according to claim 2, characterized in that: The linkage device comprises at least four rotating rollers and a linkage assembly for driving at least two of the rotating rollers to move synchronously; Wherein, the two ends of the filter screen are respectively connected to the two rotating rollers close to the linkage assembly, and the middle part of the filter screen is respectively against the other two rotating rollers.

8. The air suspension centrifugal blower according to claim 7, characterized in that: The linkage device comprises a first rotating roller, a second rotating roller, a third rotating roller and a fourth rotating roller; The first rotating roller and the second rotating roller are connected by the linkage assembly, and the two ends of the filter are respectively connected to the first rotating roller and the second rotating roller, and the middle of the filter is respectively against the third rotating roller and the fourth rotating roller.

9. The air suspension centrifugal blower according to claim 8, characterized in that: The linkage assembly includes two gears, a toothed chain respectively linked to the two gears, and a driving member for driving at least one gear to rotate; Wherein, the two gears are connected to the first rotating roller and the second rotating roller respectively.

10. The air suspension centrifugal blower according to claim 9, characterized in that: The blower further comprises a wind speed detector and a control terminal, wherein the wind speed detector is arranged on the housing, and a detection end of the wind speed detector faces the input end, so as to detect air flow velocity data entering the input end; Wherein, the control terminal is electrically connected to the wind speed detector, the body and the driving member. When the air flow rate data is less than a preset threshold, the control terminal controls the driving member to drive one of the gears to rotate, so as to switch a part of the filter opposite to the second face portion to opposite to the first face portion.