CN115405570B

CN115405570B - Noise reduction fan assembly and cleaning robot

Info

Publication number: CN115405570B
Application number: CN202211034730.4A
Authority: CN
Inventors: 谭候金; 贺智威; 潘家琛; 程伟
Original assignee: Candela Shenzhen Technology Innovations Co Ltd
Current assignee: Candela Shenzhen Technology Innovations Co Ltd
Priority date: 2022-08-26
Filing date: 2022-08-26
Publication date: 2024-09-03
Anticipated expiration: 2042-08-26
Also published as: CN115405570A

Abstract

The invention relates to a noise reduction fan assembly and a cleaning robot, wherein the noise reduction fan assembly comprises a fan shell and a fan, the fan is arranged in the fan shell, and the fan is connected to the inner wall of the fan shell; the air inlet and/or the air outlet of the fan are/is provided with silencing cotton, and the flowing direction of the inlet air flow flowing into the fan and/or the flowing direction of the exhaust air flow exhausted by the fan are/is different at least on the flowing paths at the two ends. Above-mentioned fan subassembly of making an uproar falls, with the fan setting in the fan casing, through setting up amortization cotton at the air intake and/or the air outlet of fan, amortization cotton absorbs the noise of air intake and/or air outlet, reduces the noise of fan air intake and/or air outlet, reduces the noise that uses the fan to produce, reduces the place that causes noise pollution to using the fan. The noise reduction fan assembly provided by the invention is applied to the cleaning robot, so that the noise generated in the use process of the cleaning machine is reduced, and the comfort level of user experience is improved.

Description

Noise reduction fan assembly and cleaning robot

Technical Field

The invention relates to the technical field of fans, in particular to a noise reduction fan assembly and a cleaning robot.

Background

In the working process of the fan, noise is generated due to vibration and airflow movement of the fan, and noise pollution is caused to a place where the fan is used. The existing cleaning robot comprises a storage box and a fan communicated with the storage box, wherein the fan is used for sucking sundries or water on the ground into the storage box, so that the ground cleaning work is completed. However, the cleaning machine is easy to generate loud noise in the use process, and the user experience is affected.

Disclosure of Invention

Based on this, it is necessary to provide a noise reducing fan assembly that addresses the noise problem created by fan operation.

A noise reducing fan assembly, comprising:

a fan housing;

the fan is arranged in the fan shell and is connected to the inner wall of the fan shell;

And the air inlet and/or the air outlet of the fan are/is provided with silencing cotton, and the flowing directions of the inlet air flow flowing into the fan and/or the exhaust air flow exhausted by the fan are different at least on two sections of flow paths.

In one embodiment, the air inlet is provided with a first silencing piece, the first silencing piece comprises first silencing cotton, an inner cavity is formed by surrounding the first silencing cotton, the inner cavity is in fluid communication with the air inlet, and the inlet air flow can flow into the inner cavity through the first silencing cotton and flow into the air inlet.

In one embodiment, the first silencing member further comprises a supporting member arranged on the wall of the inner cavity, the supporting member is honeycomb-shaped, a first opening which is in fluid communication with the air inlet is arranged at the end part of the supporting member, which faces the air inlet, and the inlet air flow passes through the first silencing cotton, flows into the supporting member and flows into the air inlet through the first opening.

In one embodiment, the first silencing piece is in a cylindrical structure, a second opening in fluid communication with the air inlet is formed in the end portion, facing the air inlet, of the first silencing cotton, and the first opening, the second opening and the air inlet are communicated in pairs.

In one embodiment, the fan housing comprises a housing and a partition plate arranged in the housing, the partition plate divides the housing into a first cavity and a second cavity, a through hole is formed in the partition plate and is communicated with the first cavity and the second cavity, the fan is arranged in the second cavity, an exhaust hole is formed in the cavity wall of the first cavity, a first silencing part penetrating through the partition plate is partially positioned in the first cavity, a second silencing part penetrating through the partition plate is partially positioned in the second cavity and is connected with the air inlet, and air inflow flows into the inner cavity from one side deviating from the second cavity through the first silencing cotton and flows into the air inlet.

In one embodiment, the fan housing further comprises an end housing connected to the housing, the end housing is disposed at a side facing away from the second cavity, one end of the first silencing piece facing away from the second cavity extends into the end housing, an air inlet hole is formed in the end housing, and the air inlet flows into the end housing from the air inlet hole, passes through the first silencing cotton, flows into the inner cavity and flows into the air inlet.

In one embodiment, the air outlet and the end wall of the second cavity facing away from the first cavity have a gap.

In one embodiment, the cavity wall of the first cavity and/or the cavity wall of the second cavity is provided with a second silencing piece comprising a second silencing cotton.

In one embodiment, the fan housing includes a baffle disposed between the sidewall of the first cavity and the first noise-reducing cotton and between the exhaust hole and the through hole, and the baffle is configured to guide the exhaust airflow to flow around the first noise-reducing cotton and then to be discharged from the exhaust hole.

The invention also provides a cleaning robot which comprises a box body and the noise reduction fan assembly, wherein the fan shell is arranged in the box body.

Above-mentioned fan subassembly of making an uproar falls, with the fan setting in the fan casing, through setting up amortization cotton at the air intake and/or the air outlet of fan, amortization cotton absorbs the noise of air intake and/or air outlet, reduces the noise of fan air intake and/or air outlet, when the reduction uses the fan, the noise that intake air flow and exhaust air flow produced, and then the reduction causes noise pollution to the place that uses the fan. In addition, the flow directions of the inlet air flow flowing into the fan and/or the exhaust air flow discharged by the fan are different at least in two sections of flow paths, so that noise generated by the flow of the inlet air flow and/or the exhaust air flow can be reduced. The noise reduction fan assembly provided by the invention is applied to the cleaning robot, so that the noise generated in the use process of the cleaning machine is reduced, and the comfort level of user experience is improved.

Drawings

FIG. 1 is a schematic diagram of a noise reduction fan according to an embodiment of the present invention;

FIG. 2 is a first cross-sectional view of a noise reduction blower provided by an embodiment of the invention;

FIG. 3 is a second cross-sectional view of a noise reduction blower provided by an embodiment of the invention;

FIG. 4 is a third cross-sectional view of a noise reduction blower provided by an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a housing according to an embodiment of the present invention.

In the figure:

100. A fan housing; 110. a housing; 111. a first chamber; 1111. an exhaust hole; 112. a second chamber; 120. a partition plate; 121. a through hole; 130. an end shell; 131. an air inlet hole; 140. a deflector;

200. a blower; 210. an air inlet; 220. an air outlet;

300. A first muffler; 310. a first noise-reducing cotton; 320. a support;

400. a second muffler; 410. a second noise reduction cotton; 420. a rubber member; 430. a metal piece;

500. an exhaust pipe;

600. and a shock pad.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1 and 2, the noise reduction fan assembly includes a fan housing 100 and a fan 200, the fan 200 is disposed in the fan housing 100, and the fan 200 is connected to an inner wall of the fan housing 100; the air inlet 210 and/or the air outlet 220 of the blower 200 are provided with noise-reducing cotton, and the flow direction of the inlet air flow flowing into the blower 200 and/or the exhaust air flow discharged from the blower 200 is different at least on the flow paths at the two ends.

Above-mentioned fan subassembly of making an uproar falls, with fan 200 setting in fan shell 100, through setting up amortization cotton at the air intake 210 and/or the air outlet 220 of fan 200, amortization cotton absorbs the noise of air intake 210 and/or air outlet 220, reduces the noise of fan 200 air intake 210 and/or air outlet 220, when reducing the use fan, the noise that intake air flow and exhaust air flow 200 produced, and then reduce the place that uses fan 200 and cause noise pollution. In addition, the flow direction of the intake air flow flowing into the fan 100 and/or the exhaust air flow discharged from the fan 100 is different in at least two flow paths, and noise generated by the flow of the intake air flow and/or the exhaust air flow can be reduced. The noise reduction fan assembly provided by the embodiment is applied to the cleaning robot, so that noise generated in the using process of the cleaning robot is reduced, and the comfort level of user experience is improved.

Referring to fig. 2 and 3, in some embodiments, the air inlet 210 is provided with a first silencing member 300, the first silencing member 300 includes a first silencing cotton 310, the first silencing cotton 310 encloses an inner cavity, the inner cavity is in fluid communication with the air inlet 210, and an air inlet flow can flow into the inner cavity through the first silencing cotton 310 and into the air inlet 210. Through setting up first amortization cotton 310 at air intake 210, first amortization cotton 310 encloses to be established into the inner chamber, and inner chamber and air intake 210 fluid communication, the air current that admits air flows into the inner chamber through first amortization cotton 310, and the rethread inner chamber flows into air intake 210, utilizes first amortization cotton 310 to absorb the noise that the air current that admits air intake 210 that gets into fan 200 flows and produces. And the air inflow passes through the first silencing cotton 310, so that the sound absorption effect of the first silencing cotton 310 is improved, and the noise reduction effect is improved.

Referring to fig. 2 and 3, in some embodiments, the first silencing element 300 further includes a support 320 disposed on a wall of the inner cavity, the support 320 is honeycomb-shaped, an end of the support 320 facing the air inlet 210 is provided with a first opening in fluid communication with the air inlet 210, and the intake air flows into the support 320 through the first silencing cotton 310 and flows into the air inlet 210 through the first opening. The support piece 320 is arranged on the wall of the inner cavity, the first silencing cotton 310 is supported by the support piece 320, the support piece 320 is in a honeycomb structure, the support piece 320 not only can support the first silencing cotton 310, but also has certain noise reduction capability, and the noise reduction effect of the first silencing piece 300 is improved. The end of the support 320 facing the air inlet 210 is provided with a first opening, and the air inlet airflow outside the first silencing cotton 310 sequentially passes through the first silencing cotton 310 and enters the support 320, and then flows to the air inlet end of the fan 200 through the first opening on the support 320.

Specifically, the supporting member 320 is made of a metal material, a plurality of ventilation holes are formed in the supporting member 320, and the intake air flows into the supporting member 320 through the first soundproof cotton 310 and the ventilation holes, and then flows out through the first opening.

In some embodiments, the supporting member 320 is wrapped in the inner cavity of the first silencing cotton 310 to block two ends of the first silencing cotton 310, the intake air flow can only flow into the supporting member 320 through the side wall of the first silencing cotton 310, and the end of the first silencing cotton 310 facing the air inlet 210 can further absorb the vibration generated by the operation of the fan 200.

Referring to fig. 2 and 3, in some embodiments, the first silencing member 300 has a cylindrical structure, and the end of the first silencing cotton 310 facing the air inlet 210 is provided with a second opening in fluid communication with the air inlet 210, and the first opening, the second opening and the air inlet 210 are in two-to-two communication. The first silencing piece 300 is set to be of a cylindrical structure, the first silencing cotton 310 and the supporting piece 320 are of cylindrical structures, the first silencing cotton 310 is wrapped outside the supporting piece 320, a second opening is formed in the end portion, facing the air inlet 210, of the first silencing cotton 310, corresponding to the first opening, inlet air flows into the supporting piece 320 through the first silencing cotton 310, and flows to the air inlet 210 of the fan 200 through the first opening and the second opening.

It will be appreciated that the provision of the second opening corresponding to the first opening increases the flow rate of the intake air flow, facilitating the flow of the intake air flow into the intake port 210. In some embodiments, the second opening is not formed, the intake air flows into the support 320 through the ventilation holes of the first silencing cotton 310 and the support 320, and the intake air flows into the air inlet 210 through the first opening and then through the end of the first silencing cotton 310, so as to further absorb sound and reduce noise generated by the intake air.

Referring to fig. 2 and 3, in some embodiments, the fan housing 100 includes a housing 110 and a partition 120 disposed in the housing 110, the partition 120 divides the housing 110 into a first cavity 111 and a second cavity 112, a through hole 121 is disposed on the partition 120, the through hole 121 communicates with the first cavity 111 and the second cavity 112, the fan 200 is disposed in the second cavity 112, an exhaust hole 1111 is disposed on a cavity wall of the first cavity 111, a first silencing member 300 passing through the partition 120 is partially disposed in the first cavity 111, partially disposed in the second cavity 112 and connected to the air inlet 210, and an intake air flow flows from a side facing away from the second cavity 112 into the inner cavity through the first silencing cotton 310 and flows into the air inlet 210. By providing the partition 120 in the housing 110, the housing 110 is divided into the first cavity 111 and the second cavity 112, the exhaust hole 1111 is opened on the cavity wall of the first cavity 111, the blower 200 is provided in the second cavity 112, and the exhaust air flow discharged from the air outlet 220 of the blower 200 flows out through the second cavity 112, the first cavity 111 and the exhaust hole 1111 in sequence. The first silencer 300 is disposed through the casing 110, partially disposed in the first cavity 111, partially extending into the second cavity 112 and connected to the air inlet 210 of the fan 200, and the exhaust air can flow into the support 320 through the first silencer 310 passing through the first silencer 300 and the air holes on the support 320, and then flow into the fan 200 through the first opening and the second opening.

Referring to fig. 2 and 3, in some embodiments, the fan housing 100 further includes an end housing 130 connected to the outer housing 110, the end housing 130 is disposed on a side facing away from the second cavity 112, one end of the first silencing member 300 facing away from the second cavity 112 extends into the end housing 130, an air inlet 131 is formed on the end housing 130, and an air inlet flow flows into the end housing 130 from the air inlet 131, flows into the inner cavity through the first silencing cotton 310, and flows into the air inlet 210. The end shell 130 is connected to the outer shell 110 by arranging the end shell 130 at the end of the first cavity 111 far away from the second cavity 112, the end shell 130 is covered at the end of the first silencing member 300 far away from the air inlet 210 of the fan 200, and the end of the first silencing member 300 is protected by the end shell 130. The end case 130 is provided with an air inlet 131, and the air flow passes through the air inlet 131 of the end case 130, then flows into the support 320 through the air holes of the first silencing cotton 310 and the support 320, and then flows to the air inlet 210 of the fan 200 through the first opening and the second opening.

In particular, referring to fig. 2 and 3, the air outlet 220 and the end wall of the second cavity 112 facing away from the first cavity 111 have a gap. The fan 200 is arranged in the second cavity 112, the fan 200 is connected to the cavity wall of the second cavity 112, the air outlet 220 of the fan 200 faces the end wall of the second cavity 112, a gap is reserved between the air outlet 220 of the fan 200 and the end wall of the second cavity 112, which faces away from the first cavity 111, so that vibration generated by the operation of the fan 200 is prevented from being transmitted to the end wall of the shell 110 through the air outlet 220. The exhaust hole 1111 is provided on a wall of the first chamber 111, and an air outlet of the blower 200 faces an end of the second chamber 112 facing away from the first chamber 111, and an exhaust air flow discharged through the air outlet of the blower 200 is different in flow direction at least on both end flow paths. The exhaust gas flows towards the inner end of the second cavity 112, then sequentially passes through the second cavity 112, the through hole 121 and the first cavity 111 along the axial direction of the housing 110, and finally flows out through the exhaust hole 1111, and the flow direction of the exhaust gas is bent, so that the flow directions of the exhaust gas on two sections of flow paths are different, the flow path of the exhaust gas in the housing 110 is increased, and noise generated by the flow of the exhaust gas is reduced.

Specifically, referring to fig. 2 and 3, the blower 200 is connected to the wall of the second chamber 112 through a damper 600, and the damper 600 is used to absorb vibration generated during operation of the blower 200. The fan 200 is mounted on the shock pad 600, the shock pad 600 is connected to the cavity wall of the second cavity 112, and the fan 200 is abutted to the shock pad 600, so that vibration noise generated by the operation of the fan 200 is reduced by arranging the shock pad 600. Specifically, a first mounting hole is formed in a cavity wall of the second cavity 112, the mounting hole is a threaded hole, a second mounting hole is formed in the shock pad 600 corresponding to the first mounting hole, and a screw sequentially penetrates through the second mounting hole and the first mounting hole to connect the shock pad 600 and the cavity wall of the second cavity 112.

Preferably, the housing 110 and the partition 120 are integrally formed, and the housing 110 is made of plastic material, so that actual processing and production in factories are facilitated, and production efficiency is improved.

Referring to fig. 2 and 3, the cavity wall of the first cavity 111 and/or the cavity wall of the second cavity 112 is provided with a second silencing member 400, and the second silencing member 400 includes a second silencing cotton 410. In some embodiments, the second silencing member 400 is disposed on the wall of the first chamber 111, and the noise generated by the exhaust gas flow is reduced by absorbing the noise by the second silencing cotton 410 of the second silencing member 400 when the exhaust gas flow passes through the first chamber 111. In some embodiments, the second silencing member 400 is disposed on the wall of the second chamber 112, and the noise generated by the exhaust gas flow is reduced by absorbing the noise by the second silencing cotton 410 of the second silencing member 400 when the exhaust gas flow passes through the second chamber 112. In some embodiments, the second silencing member 400 is disposed on the walls of the first and second chambers 111 and 112, and the noise generated by the exhaust gas flow is reduced by absorbing the noise by the second silencing cotton 410 of the second silencing member 400 when the exhaust gas flow passes through the first and second chambers 111 and 112. It will be appreciated that the second muffler 400 is provided on the inner walls of the first and second chambers 111 and 112, that is, the second muffler 400 is provided on the flow path of the discharged air flow, to perform sound absorbing work.

Specifically, the second silencing member 400 further includes a rubber member 420 and a metal member 430, the second silencing cotton 410, the rubber member 420 and the metal member 430 are sequentially arranged, the rubber member 420 and the metal member 430 are sandwiched between the second silencing cotton 410 and the inner wall of the housing 110, and the metal member 430 is attached to the inner wall of the housing 110. The noise damping effect of the second noise damping member 400 is further enhanced by providing the rubber member 420 and the metal member 430, and since the housing 110 is made of a rubber material, the metal member 430 provides a certain supporting force to the housing 110. Specifically, the metal member 430 is a metal plate made of an aluminum alloy material, and the rubber member 420 is a rubber plate made of a rubber material. The inner wall of the housing 110 may be a wall of the first cavity 111, a wall of the second cavity 112, or a wall of the first cavity 111 and a wall of the second cavity 112.

It will be appreciated that in some embodiments, only the second sound damping cotton 410 may be disposed in the first chamber 111 according to actual production needs and the size of the inner wall of the blower housing 100.

Referring to fig. 4 and 5, in some embodiments, the fan housing 100 includes a baffle 140, the baffle 140 is disposed between the sidewall of the first cavity 111 and the first noise-reducing cotton 310 and between the exhaust hole 1111 and the communication hole 121, and the baffle 140 is used for guiding the exhaust gas flow around the first noise-reducing cotton 310 and then discharging from the exhaust hole 1111. The baffle 140 is disposed in the second cavity 112, one end of the baffle 140 is connected to the sidewall of the first cavity 111, the other end is abutted to the outer wall of the first silencing cotton 310, and the baffle 140 is located between the exhaust hole and the communication hole 121, when the air outlet 220 of the fan 200 discharges the exhaust air flow, the exhaust air flow flows into the first cavity 111 through the second cavity 112 and the communication hole 121, and flows around the circumference of the first silencing cotton 310 and then is discharged out of the fan housing 100 from the exhaust hole 1111. The second muffler 400 is provided in the first chamber 111 so as to absorb noise generated by the flow of the exhaust gas in the first chamber 111 by flowing around the first muffler cotton 310, that is, around the first chamber 111.

Preferably, the noise reduction fan assembly further includes an exhaust duct 500, the exhaust duct 500 communicating with the exhaust hole 1111, and an exhaust air flow passing through the exhaust hole 1111 exiting through the exhaust duct 500. Specifically, the exhaust pipe 500 is made of a noise-reducing cotton material, and further reduces noise generated by the exhaust gas flow.

The embodiment of the invention also provides a cleaning robot, which comprises a box body and the noise reduction fan assembly, wherein the fan shell 100 is arranged in the box body, the fan 200 is used for generating suction force to suck surface stains into the box body, and the noise of the fan 200 is low during working of the cleaning robot, so that the comfort level of a user is improved.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. A noise reduction fan assembly, comprising:

a fan housing (100);

The fan (200) is arranged in the fan shell (100), and the fan (200) is connected to the inner wall of the fan shell (100);

The air inlet (210) and/or the air outlet (220) of the fan (200) are/is provided with silencing cotton, and the flow direction of the inlet air flow flowing into the fan (200) and/or the flow direction of the exhaust air flow discharged by the fan (200) are different in at least two sections of flow paths;

the air inlet (210) is provided with a first silencing piece (300), the first silencing piece (300) comprises first silencing cotton (310), an inner cavity is formed by surrounding the first silencing cotton (310), the inner cavity is in fluid communication with the air inlet (210), and the inlet air flow can flow into the inner cavity through the first silencing cotton (310) and flow into the air inlet (210);

The fan housing (100) comprises a housing (110) and a partition plate (120) arranged in the housing (110), the partition plate (120) divides the housing (110) into a first cavity (111) and a second cavity (112), a through hole (121) is formed in the partition plate (120), the through hole (121) is communicated with the first cavity (111) and the second cavity (112), the fan (200) is arranged in the second cavity (112), an exhaust hole (1111) is formed in a cavity wall of the first cavity (111), the first silencer (300) penetrating through the partition plate (120) is partially positioned in the first cavity (111), and the first silencer (300) is partially positioned in the second cavity (112) and connected to the air inlet (210), and air inlet flows into the inner cavity through the first silencer cotton (310) from one side deviating from the second cavity (112) and flows into the air inlet (210).

2. The noise reduction fan assembly of claim 1, wherein the first silencer (300) further comprises a support member (320) disposed on a wall of the inner cavity, the support member (320) being honeycomb-shaped, an end of the support member (320) facing the air inlet (210) being provided with a first opening in fluid communication with the air inlet (210), and the inlet air flow flowing into the support member (320) through the first silencer cotton (310) and flowing into the air inlet (210) through the first opening.

3. The noise reduction fan assembly according to claim 2, wherein the first silencing member (300) has a cylindrical structure, and a second opening in fluid communication with the air inlet (210) is provided at an end of the first silencing cotton (310) toward the air inlet (210), and the first opening, the second opening, and the air inlet (210) are in two-by-two communication.

4. The noise reduction fan assembly according to claim 1, wherein the fan housing (100) further comprises an end housing (130) connected to the outer housing (110), the end housing (130) is disposed at a side facing away from the second cavity (112), one end of the first silencing member (300) facing away from the second cavity (112) extends into the end housing (130), an air inlet hole (131) is formed in the end housing (130), and the air inlet flows into the end housing (130) from the air inlet hole (131), flows into the inner cavity through the first silencing cotton (310), and flows into the air inlet (210).

5. The noise reduction fan assembly of claim 1, wherein the air outlet (220) and the end wall of the second cavity (112) facing away from the first cavity (111) have a gap.

6. The noise reducing fan assembly according to claim 1, wherein a cavity wall of the first cavity (111) and/or a cavity wall of the second cavity (112) is provided with a second silencing piece (400), the second silencing piece (400) comprising a second silencing cotton (410).

7. The noise reduction fan assembly according to claim 1, wherein the fan housing (100) includes a baffle (140), the baffle (140) being disposed between a sidewall of the first cavity (111) and the first noise reduction cotton (310) and between the exhaust hole (1111) and the through hole (121), the baffle (140) being configured to guide the exhaust gas flow to flow around the first noise reduction cotton (310) and then to be discharged from the exhaust hole (1111).

8. A cleaning robot comprising a housing and the noise reducing fan assembly of any of claims 1-7, the fan housing (100) being mounted in the housing.