Silencing assembly, silencing system, and cleaning device

Abstract

The present disclosure relates to a silencing assembly, including: a first housing; and a first silencing member configured to be disposed on an inner side of the first housing and assembled in the first housing, where a first gap is formed between an outer wall of the first silencing member and an inner wall of the first housing, an inner wall of the first silencing member defines a first airflow path, and an airflow in the first airflow path flows along a first direction. The first silencing member includes: at least one first airflow outlet, where the airflow in the first airflow path is discharged only through the first airflow outlet; and at least two blades disposed along a circumferential direction, where a gas channel is formed between two adjacent blades in the at least two blades, such that the airflow from the first airflow path is allowed to enter the first gap through the gas channel, and a part of the airflow is allowed to return from the first gap into the first airflow path.

Description

FIELD OF TECHNOLOGY

[0001] The present disclosure relates to a silencing assembly for noise reduction, a silencing system for a motor, and a cleaning device including such silencing system.BACKGROUND

[0002] In the application where a power apparatus (such as a motor) is used to drive an airflow, significant noise will be generated when the airflow passes through various chambers. Such noise is commonly referred to as aerodynamic noise. But the use of a current noise reduction structure often hinders airflow discharge and heat dissipation, or reduces the aerodynamic performance of the power apparatus. Therefore, how to reduce noise without significantly affecting various performance has become a difficult problem. In addition, a common method is to dispose a silencing material, such as a silencing sponge. However, the noise reduction effect achieved by such method is not ideal. This is because, in order to achieve the ideal noise reduction effect, a relatively large silencing material needs to be disposed, which is not practical for a device that requires a compact structure. Therefore, how to reduce noise in a compact space is also a big problem.

[0003] For example, the current cleaning device is more and more widely applied, and especially with the improvement of people's living standards, the demand for household cleaning devices such as vacuum cleaners and floor scrubbers is also increasing. Noise is a crucial consideration for users to choose household cleaning devices, and conventional vacuum cleaners and floor scrubbers usually make a lot of noise. Especially when a motor rotates at a high speed, high noise will greatly reduce the user experience. Moreover, the household cleaning devices need to be miniaturized and lightweight as much as possible.

[0004] At present, in some cleaning devices, noise is reduced by mounting a dual-motor-cover noise reduction structure including an inner motor cover and an outer motor cover outside a motor, and noise energy is reduced by filling an air passage between the inner motor cover and the outer motor cover with a silencing sponge. However, such cleaning device is actually not ideal in noise reduction and still makes a lot of noise during use. Moreover, such technical solution will result in a large size of the motor cover.

[0005] Therefore, a noise reduction solution capable of overcoming the above defects is needed.SUMMARY

[0006] The present disclosure aims to propose a better solution for the above problems, in order to reduce noise as much as possible and achieve the compactness of a device. In the case of a cleaning device including a motor, the aerodynamic performance of the cleaning device is not compromised.

[0007] According to an example in an aspect of the present disclosure, a silencing assembly is provided. The silencing assembly includes a first housing and a first silencing member. The first silencing member is configured to be disposed on an inner side of the first housing and assembled in the first housing. A first gap is formed between an outer wall of the first silencing member and an inner wall of the first housing. An inner wall of the first silencing member defines a first airflow path. An airflow in the first airflow path flows along a first direction. The first silencing member includes at least one first airflow outlet and at least two blades. The airflow in the first airflow path is discharged only through the first airflow outlet. The at least two blades are disposed along a circumferential direction. A gas channel is formed between two adjacent blades in the at least two blades, such that the airflow from the first airflow path is allowed to enter the first gap through the gas channel, and a part of the airflow is allowed to return from the first gap into the first airflow path.

[0008] By virtue of the first silencing member disposed in this way in the present disclosure, on the one hand, noise can be absorbed by the blades themselves, for example, due to collisions between the airflow and the blades. Especially in the case where a plurality of blades are disposed along the circumferential direction, it is allowed to absorb noise to a greater extent.

[0009] On the other hand, by virtue of the airflow channel formed between every two adjacent blades, the airflow is allowed to enter the first gap, thereby further extending a flow passage to reduce the noise. Moreover, the airflow entering the first gap will not be discharged through the first housing. On the contrary, a part of the airflow entering the first gap will return into the first airflow path through the airflow channel and can only be discharged through the first airflow outlet in the first silencing member. In this way, the flow passage for the airflow is further extended. During this process, collisions that may occur between airflows will also reduce a velocity and energy of the airflow.

[0010] In addition, the airflow entering the first gap will also undergo refraction and / or reflection on the inner wall of the first housing. Through the interaction between the airflow and the inner wall of the first housing, the velocity and energy of the airflow are further reduced, thereby reducing the noise.

[0011] Therefore, even in a compact space, the flow passage for the airflow can be significantly extended, and the velocity and energy of the airflow can be significantly reduced, thereby achieving a good noise reduction effect.

[0012] According to some embodiments of the present disclosure, an angle between an extension direction of the gas channel and the first direction is within a range of 0° to 45°.

[0013] Surprisingly, the inventor of the present disclosure found a correlation between the noise reduction effect and the angle between the extension direction of the gas channel and the flow direction of the airflow. When the angle between the extension direction of the gas channel and the flow direction of the airflow in the first airflow path is within the range of 0° to 45°, it is allowed to achieve a good noise reduction effect.

[0014] According to some embodiments of the present disclosure, the first silencing member further includes at least one barrier portion. The barrier portion protrudes outwards from the first silencing member to abut against the inner wall of the first housing, so as to prevent the airflow entering the first gap from passing through the barrier portion along the circumferential direction. The barrier portion can be positioned close to the first airflow outlet. According to some embodiments of the present disclosure, the first silencing member includes two barrier portions located on two sides of the first airflow outlet respectively.

[0015] By virtue of the barrier portion, the airflow in the first gap cannot be discharged directly through the first airflow outlet, but must return into the first airflow path through the airflow channel, thereby allowing for further extension of the flow passage in a narrow and small space.

[0016] According to some embodiments of the present disclosure, the width of the first gap along a radial direction is within a range of 0.2 mm to 5 mm. By virtue of the first gap that is very small, a good noise reduction effect can be achieved, thereby allowing for significant improvement of the compactness of a device.

[0017] According to some embodiments of the present disclosure, the first silencing member is annular. In some embodiments, the first silencing member may be a silencing cover.

[0018] According to some embodiments of the present disclosure, the gas channel is tapered along the radial direction.

[0019] According to some embodiments of the present disclosure, the cross section of any one of the at least two blades is in the shape of a water droplet.

[0020] By virtue of the tapered gas channel or the blades in the water droplet shape, it is allowed to enhance the refraction and / or reflection of the airflow on the blades, so as to further reduce the velocity and energy of the airflow.

[0021] According to some embodiments of the present disclosure, the first silencing member further includes a plurality of first holes for absorbing noise, where the first holes are located near the first airflow outlet. The formation of the plurality of first holes on the first silencing member contributes to enhancing the refraction and / or reflection of the airflow, so as to further reduce the velocity and energy of the airflow, which contributes to noise absorption.

[0022] According to some embodiments of the present disclosure, the silencing assembly further includes a second silencing member and a second housing. The second silencing member is located on an outer side of the first housing. A second airflow path is formed between the first housing and the second silencing member, and the airflow discharged from the first airflow path through the first airflow outlet is capable of entering the second airflow path. The second silencing member includes at least one second airflow outlet to allow discharge of the airflow in the second airflow path. The second housing is located on an outer side of the second silencing member and closely fits with the second silencing member.

[0023] In this way, on the basis of the noise reduction effect achieved by the first silencing member as above, the silencing assembly in the present disclosure further allows for further implementation of dual silencing, that is, dual air passages are achieved by the first airflow path located on an inner side and the second airflow path located on an outer side, thereby significantly extending the flow passage for the airflow. Moreover, the first airflow path and the second airflow path are arranged as coaxial annular flow passages, requiring only a very small space. Therefore, the silencing assembly proposed in the present disclosure allows for an excellent noise reduction effect to be achieved in a very compact space.

[0024] According to some embodiments of the present disclosure, the first housing includes at least one first airflow guide member to guide the airflow discharged from the first airflow path to flow along the first direction and / or a second direction separately in the second airflow path, where the second direction is opposite to the first direction.

[0025] According to some embodiments of the present disclosure, the second housing includes at least one second airflow guide member to guide the airflow discharged from the second airflow path to flow along the first direction and / or the second direction separately after leaving the second airflow outlet.

[0026] The airflow is guided by virtue of the first and / or second airflow guide member to flow along two opposite directions separately, and ultimately converges, so as to form a bidirectional wraparound air passage, which allows for further improvement in noise reduction.

[0027] According to some embodiments of the present disclosure, the second airflow outlet and the first airflow outlet are arranged to be opposite to each other in a radial direction.

[0028] According to some embodiments of the present disclosure, a second gap is formed between an inner wall of the second silencing member and an outer wall of the first housing, and the width of the second gap along a radial direction does not exceed 5 mm.

[0029] According to some embodiments of the present disclosure, the second silencing member includes a plurality of second holes, where the second holes are through holes, thereby forming a plurality of dense cavity structures with the second housing to enhance sound wave refraction and / or reflection. Alternatively or additionally, the second holes of the second silencing member may also be blind holes.

[0030] According to an example in another aspect of the present disclosure, a silencing system for a motor is provided. The silencing system includes any one silencing assembly as described above, where the first silencing member is arranged between the motor and the first housing, the first airflow path is formed between the inner wall of the first silencing member and an outer wall of the motor, and the airflow discharged from the motor flows along the first direction in the first airflow path. The second airflow path is formed between the outer wall of the first housing and the inner wall of the second silencing member, and the airflow discharged from the first airflow path through the first airflow outlet can enter the second airflow path and is discharged through the second airflow outlet.

[0031] According to some embodiments of the present disclosure, the silencing system further includes a shock-absorbing pad and / or a silencing material.

[0032] According to an example in yet another aspect of the present disclosure, a cleaning device is provided. The cleaning device includes a cleaning assembly, a power apparatus, and any one silencing system as described above, where the silencing system is configured to reduce noise of the power apparatus. By virtue of the silencing system in the present disclosure, the noise of the cleaning device in use is significantly reduced without reducing its aerodynamic performance, thereby significantly improving the user experience. Experiments conducted by the inventor have proved that under the same conditions, the use of the silencing system in the present disclosure allows for noise reduction of 3-4 dB(A) and significant improvement in sound quality. Moreover, researches have shown that people can easily recognize noise differences of 2-3 dB(A). Therefore, consumers can obviously perceive the noise reduction effect achieved by the present disclosure, and their usage experience is greatly improved.

[0033] These and other aspects of the present disclosure will become clear and clarified with reference to the embodiments described below.BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to better understand the present disclosure and to more clearly illustrate how to implement the same, reference is now made by way of example only to the accompanying drawings, in which: FIG. 1 schematically shows a schematic diagram of a part of a cleaning device according to an embodiment of the present disclosure; FIG. 2 schematically shows a longitudinal sectional view of a silencing system according to an embodiment of the present disclosure; FIG. 3 schematically shows an exploded view of a silencing system according to an embodiment of the present disclosure; FIG. 4 schematically shows a transverse sectional view of a silencing system according to an embodiment of the present disclosure from a top angle of view; FIG. 5 schematically shows a transverse sectional view of a silencing assembly according to an embodiment of the present disclosure from a bottom angle of view; FIG. 6 schematically shows a transverse sectional view of a silencing assembly according to another embodiment of the present disclosure from a bottom angle of view; FIG. 7 schematically shows a top view of a first silencing member according to an embodiment of the present disclosure; FIG. 8 schematically shows a side view of a first silencing member in FIG. 6; FIG. 9 schematically shows a top view of a first silencing member according to another embodiment of the present disclosure; and FIG. 10 schematically shows a top view of a first silencing member according to yet another embodiment of the present disclosure. DESCRIPTION OF THE EMBODIMENTS

[0035] The present disclosure will be described with reference to the accompanying drawings. It should be understood that although the detailed description and specific examples indicate exemplary embodiments of a silencing assembly, a silencing system, and a cleaning device, they are only intended for illustrative purposes and not intended to limit the scope of the present disclosure. These and other features, aspects, and advantages of the silencing assembly, the silencing system, and the cleaning device in the present disclosure can be better understood in combination with the following descriptions, the appended claims, and the accompanying drawings. It should be understood that the accompanying drawings are only schematic and not drawn to scale. It should also be understood that the same reference signs denote the same or similar components in the entire drawings.

[0036] FIG. 1 shows a partial schematic diagram of a cleaning device 1 according to an embodiment of the present disclosure. For example, the device may be a vacuum cleaner, a floor scrubber or another cleaning device that uses wet cleaning, or another electric device that uses a power apparatus. This is only an exemplary demonstration, and the present disclosure is not limited to this. The cleaning device 1 includes a cleaning assembly, a power apparatus, and a silencing system 10 for reducing noise generated by the power apparatus. The cleaning assembly is configured to perform cleaning operation, and includes a dust collection pipe, etc. The power apparatus is configured to provide power for the cleaning operation, and is, for example, a motor, a fan, etc. The silencing system 10 is configured to reduce the noise generated by the power apparatus during operation. Although the figure shows that the silencing system 10 is located at a handle of the cleaning device 1, the present disclosure is not limited to the position as shown in the figure, but may be disposed at any suitable position.

[0037] Referring to FIG. 2 to FIG. 4, exemplary embodiments of the silencing system 10 are shown. FIG. 2 shows a longitudinal sectional view of a silencing system 10 that has been assembled, FIG. 3 shows an exploded view of a silencing system 10, and FIG. 4 shows a transverse sectional view of a silencing system 10 from a top angle of view. The silencing system can be applicable to any suitable power apparatus, such as the motor 20. For the sake of simplification, the motor is used as an example for description below, but the present disclosure is not limited to this. As shown in FIG. 2, the motor 20 is accommodated in the silencing system 10, and a housing 30 is circumferentially disposed on an outer side of the motor 20. An end cover 40 is disposed at an end part of the housing 30, and a first shock-absorbing pad 50 is disposed between the end cover 40 and the motor. The silencing system 10 further includes a silencing assembly 300 located around the motor 20. A gap is formed along a radial direction between the silencing assembly 300 and the motor 20. In some embodiments, the gap is roughly annular. The air in the external environment enters the motor through a front cover, is circulated inside the motor and then discharged out of the motor, and enters the gap between the silencing assembly 300 and the motor 20.

[0038] FIG. 5 schematically shows an exemplary embodiment of a silencing assembly 300 according to the present disclosure from a bottom angle of view. The silencing assembly 300 includes a first silencing member 100 located on the outer side of the motor 20. The silencing assembly 300 further includes a first housing 110, where the first silencing member 100 is configured to be disposed on an inner side of the first housing 110 and assembled in the first housing 110. A first gap G1 is formed between an outer wall of the first silencing member 100 and an inner wall of the first housing 110, as shown in FIG. 4. In some embodiments, the width of the first gap G1 along a radial direction is within a range of 0.2 mm to 5 mm. Referring to FIG. 4, an inner wall of the first silencing member 100 further defines a first airflow path P1, and an airflow in the first airflow path P1 flows along a first direction F1. Exemplarily, from the angle of view in FIG. 4, it is shown that the first direction F1 is a counterclockwise direction, and a second direction F2 is a clockwise direction, but the present disclosure is not limited to this.

[0039] Referring to FIG. 5, the first silencing member 100 includes at least one first airflow outlet 101. The first airflow outlet 101 communicates with the first airflow path P1. The airflow in the first airflow path P1 is discharged only through the first airflow outlet 101. In some embodiments, the first airflow outlet 101 can extend radially from the first airflow path P1. Although it is shown in FIG. 5 that the first silencing member 100 includes four first airflow outlets 101, the present disclosure is not limited to this.

[0040] The first silencing member 100 further includes at least two blades 102. The at least two blades 102 are disposed along a circumferential direction. In some embodiments, the first silencing member 100 includes a plurality of blades 102 disposed along the circumferential direction. A gas channel 103 is formed between every two adjacent blades 102, such that the airflow from the first airflow path P1 is allowed to enter the first gap G1 through the gas channel 103, for example, as shown by a dashed arrow that is outward along the radial direction in FIG. 5. In addition, these gas channels 103 also allow a part of the airflow to return from the first gap G1 into the first airflow path P1, as shown by a dashed arrow that is inward along the radial direction in FIG. 5.

[0041] The airflow in the first airflow path P1 flows along the first direction F1. From the bottom angle of view in FIG. 5, the first direction is clockwise. In some embodiments, as shown in FIG. 5, an angle between an extension direction F of the gas channel 103 and the first direction F1 is within a range of 0° to 45°. The inventor of the present disclosure found that the range of angle is particularly advantageous to allow for a good noise reduction effect to be achieved by the first silencing member disposed in this way.

[0042] In some embodiments, as shown in FIG. 5, the first silencing member 100 further includes at least one barrier portion 104 located near the first airflow outlet 101. In some embodiments, the first silencing member includes two barrier portions 104 located on two sides of the first airflow outlet 101 respectively. The barrier portion 104 protrudes outwards from the first silencing member 100 to abut against the inner wall of the first housing 110, so as to prevent the airflow entering the first gap G1 from passing through the barrier portion 104 along the circumferential direction. Due to the barrier portion 104, the airflow entering the first gap G1 cannot directly enter the first airflow outlet 101. The collision between the airflow and the barrier portion also allows for further reduction in energy of the airflow. A part of the airflow returns into the first airflow path through the airflow channel 103, thereby leaving the first silencing member 100 through the first airflow outlet 101.

[0043] As shown in FIG. 5, the first housing 110 further includes at least one first airflow guide member 111 to guide the airflow discharged from the first airflow path. In some embodiments, the first airflow guide member 111 includes a bent portion that bends towards a desired flow direction of the airflow from an outer wall of the first housing. In some embodiments, the first airflow guide member 111 may be integrally formed with the first housing 110. In some other embodiments, the first airflow guide member 111 may be formed separately and attached to the first housing 110. In some embodiments, referring to FIG. 4, the first airflow guide member 111 may guide the airflow discharged from the first airflow path to flow roughly along the first direction F1 in a second airflow path P2. In some embodiments, the first airflow guide member 111 may guide the airflow discharged from the first airflow path to flow roughly along the second direction F2 in the second airflow path P2, where the second direction F2 is opposite to the first direction F1. In some embodiments, the first airflow guide member 111 may also guide the airflow discharged from the first airflow path to flow along the first direction F1 and the second direction F2 separately in the second airflow path P2, as shown in FIG. 4.

[0044] FIG. 7 and FIG. 8 show a first silencing member 100 according to an embodiment of the present disclosure. In some embodiments, the first silencing member 100 further includes a plurality of first holes 105 for absorbing noise, where these first holes 105 are located near the first airflow outlet 101 to further absorb the noise.

[0045] FIG. 9 shows a first silencing member 100 according to another embodiment of the present disclosure, in which the gas channel 103 is tapered from an inner side to an outer side along the radial direction. The energy of the airflow passing through the gas channel can be further reduced through the tapered gas channel. In other embodiments, other settings or structures of the gas channel that contribute to noise reduction are also feasible.

[0046] FIG. 10 shows a first silencing member 100 according to another embodiment of the present disclosure, in which the cross section of any one of the at least two blades 102 is in the shape of a water droplet. In other embodiments, other shapes of the blade that contribute to noise reduction are also feasible.

[0047] Referring to FIG. 4 and FIG. 6, in some embodiments, the silencing assembly 300 further includes a second silencing member 200 located on an outer side of the first housing 110. The second airflow path P2 is formed between the first housing 110 and the second silencing member 200, and the airflow discharged from the first airflow path P1 through the first airflow outlet 101 is capable of entering the second airflow path P2. The second silencing member 200 includes at least one second airflow outlet 201 to allow discharge of the airflow in the second airflow path P2.

[0048] In some embodiments, a second gap G2 is formed between an inner wall of the second silencing member 200 and the outer wall of the first housing 110. In some embodiments, the width of the second gap along a radial direction does not exceed 5 mm.

[0049] In some embodiments, referring to FIG. 4 and FIG. 6, the silencing assembly 300 further includes a second housing 210 that is located on an outer side of the second silencing member 200 and closely fits with the second silencing member 200.

[0050] In some embodiments, the second housing includes at least one second airflow guide member 211, as shown in FIG. 6. In some embodiments, the second airflow guide member 211 includes a bent portion that bends towards the desired flow direction of the airflow from an outer wall of the second housing. In some embodiments, the second airflow guide member 211 may be integrally formed with the second housing. In some other embodiments, the second airflow guide member 211 may be formed separately and attached to the second housing. In some embodiments, the second airflow guide member 211 guides the airflow discharged from the second airflow path P2 to flow along the first direction F1 and / or the second direction F2 after leaving the second airflow outlet 201. Then, the airflow can be discharged through an outlet on the housing 30.

[0051] In some embodiments, the second airflow outlet 201 and the first airflow outlet 101 are arranged to be opposite to each other in a radial direction. In this way, the flow passage for the airflow is extended to the maximum extent.

[0052] In some embodiments, the second silencing member 200 may include a plurality of second holes (not shown). In some embodiments, the second holes are through holes, thereby forming a plurality of dense cavity structures with the second housing 210 to enhance sound wave refraction and / or reflection. In other embodiments, the second holes may be blind holes.

[0053] In some embodiments, as shown in FIG. 2 and FIG. 3, a second shock-absorbing pad 60 is disposed between the motor 20 and the second housing 210. In some embodiments, additionally or alternatively, a third shock-absorbing pad 70 is disposed between the second housing 210 and the housing 30.

[0054] The flow path for the airflow is further explained with reference to FIG. 4. The airflow discharged from the motor flows roughly along the first direction F1 in the first airflow path P1. The airflow in the first airflow path P1 leaves the first silencing member 100 through the first airflow outlet 101 when flowing to the first airflow outlet 101. A part of the airflow in the first airflow path P1 will collide with the blades to be refracted and / or reflected, thereby reducing its energy. A part of the airflow in the first airflow path P1 will enter the first gap G1 separately through the plurality of gas channels 103. A part of the airflow entering the first gap G1 will collide with the first housing, thereby reducing its energy. Moreover, the airflow entering the first gap G1 cannot leave the first silencing member through the first airflow outlet 101 due to the existence of the barrier portion, and the remaining airflow can only return into the first airflow path P1 through the gas channel 103, thereby further extending the flow passage. Therefore, the airflow in the first airflow path P1 can only leave the first silencing member 100 through the first airflow outlet 101. During this process, the energy of the airflow has been significantly attenuated.

[0055] By virtue of the first airflow guide member 111 on the first housing, the airflow leaving the first silencing member 100 and the first housing 110 can be guided to flow along the first direction F1 and / or the second direction F2 in the second airflow path P2. In the case of flowing along the first direction F1 and the second direction F2 separately, two airflows along opposite directions will collide, such that the velocity of the airflow is reduced, thereby further attenuating the overall energy of the airflow. The airflow in the second airflow path P2 leaves the second silencing member 200 through the second airflow outlet 201. During this process, the energy of the airflow is further attenuated.

[0056] By virtue of the second airflow guide member 211 on the second housing, the airflow leaving the second silencing member 200 and the second housing 210 can be guided to flow along the first direction F1 and / or the second direction F2. Then, the remaining airflow with low energy is discharged out of the silencing system 10 through the outlet on the housing 30. Thus, compared with the prior art, a good noise reduction effect is further achieved.

[0057] By virtue of the silencing assembly and the silencing system according to the embodiments of the present disclosure, a dual-air-passage bidirectional wraparound design can be implemented, such that the flow passage is significantly extended, and a wind velocity is greatly reduced, thereby significantly improving the noise reduction effect, and implementing efficient noise reduction in a compact space. Based on the experiments, under the same conditions, the silencing assembly according to the embodiment of the present disclosure can achieve the noise reduction effect of 3-4 dB(A), which is noise reduction that can be obviously perceived by people. Moreover, the silencing assembly according to the embodiment of the present disclosure also improves the noise quality, making the noise sound relatively soft. Meanwhile, the aerodynamic performance is not significantly compromised or only slightly compromised.

[0058] In the process of implementing the claimed invention, those skilled in the art can understand and implement the variants of the disclosed embodiments by learning the drawings, the disclosure and the appended claims. In the claims, the term "comprise" does not exclude other elements or steps, and the indefinite article "a / an" or "one" does not exclude a plurality of. The features described in different dependent claims or embodiments may be combined as far as technically feasible.

[0059] The previous description has been described with reference to specific embodiments. However, the above illustrative discussion is not intended to be exhaustive or to limit the present disclosure to the precise form described. In view of the above teachings, many modifications and changes are possible. Thus, others skilled in the art can make the best use of technologies and various embodiments with various modifications suitable for various purposes.

[0060] While the present disclosure and examples have been described with reference to the accompanying drawings, various changes and modifications will become apparent to those skilled in the art. These changes and modifications shall be understood to be included within the scope of the present disclosure.

Examples

Embodiment Construction

[0035]The present disclosure will be described with reference to the accompanying drawings. It should be understood that although the detailed description and specific examples indicate exemplary embodiments of a silencing assembly, a silencing system, and a cleaning device, they are only intended for illustrative purposes and not intended to limit the scope of the present disclosure. These and other features, aspects, and advantages of the silencing assembly, the silencing system, and the cleaning device in the present disclosure can be better understood in combination with the following descriptions, the appended claims, and the accompanying drawings. It should be understood that the accompanying drawings are only schematic and not drawn to scale. It should also be understood that the same reference signs denote the same or similar components in the entire drawings.

[0036]FIG. 1 shows a partial schematic diagram of a cleaning device 1 according to an embodiment of the present discl...

FIELD OF TECHNOLOGY

[0001] The present disclosure relates to a silencing assembly for noise reduction, a silencing system for a motor, and a cleaning device including such silencing system.BACKGROUND

[0002] In the application where a power apparatus (such as a motor) is used to drive an airflow, significant noise will be generated when the airflow passes through various chambers. Such noise is commonly referred to as aerodynamic noise. But the use of a current noise reduction structure often hinders airflow discharge and heat dissipation, or reduces the aerodynamic performance of the power apparatus. Therefore, how to reduce noise without significantly affecting various performance has become a difficult problem. In addition, a common method is to dispose a silencing material, such as a silencing sponge. However, the noise reduction effect achieved by such method is not ideal. This is because, in order to achieve the ideal noise reduction effect, a relatively large silencing material needs to be disposed, which is not practical for a device that requires a compact structure. Therefore, how to reduce noise in a compact space is also a big problem.

[0003] For example, the current cleaning device is more and more widely applied, and especially with the improvement of people's living standards, the demand for household cleaning devices such as vacuum cleaners and floor scrubbers is also increasing. Noise is a crucial consideration for users to choose household cleaning devices, and conventional vacuum cleaners and floor scrubbers usually make a lot of noise. Especially when a motor rotates at a high speed, high noise will greatly reduce the user experience. Moreover, the household cleaning devices need to be miniaturized and lightweight as much as possible.

[0004] At present, in some cleaning devices, noise is reduced by mounting a dual-motor-cover noise reduction structure including an inner motor cover and an outer motor cover outside a motor, and noise energy is reduced by filling an air passage between the inner motor cover and the outer motor cover with a silencing sponge. However, such cleaning device is actually not ideal in noise reduction and still makes a lot of noise during use. Moreover, such technical solution will result in a large size of the motor cover.

[0005] Therefore, a noise reduction solution capable of overcoming the above defects is needed.SUMMARY

[0006] The present disclosure aims to propose a better solution for the above problems, in order to reduce noise as much as possible and achieve the compactness of a device. In the case of a cleaning device including a motor, the aerodynamic performance of the cleaning device is not compromised.

[0007] According to an example in an aspect of the present disclosure, a silencing assembly is provided. The silencing assembly includes a first housing and a first silencing member. The first silencing member is configured to be disposed on an inner side of the first housing and assembled in the first housing. A first gap is formed between an outer wall of the first silencing member and an inner wall of the first housing. An inner wall of the first silencing member defines a first airflow path. An airflow in the first airflow path flows along a first direction. The first silencing member includes at least one first airflow outlet and at least two blades. The airflow in the first airflow path is discharged only through the first airflow outlet. The at least two blades are disposed along a circumferential direction. A gas channel is formed between two adjacent blades in the at least two blades, such that the airflow from the first airflow path is allowed to enter the first gap through the gas channel, and a part of the airflow is allowed to return from the first gap into the first airflow path.

[0008] By virtue of the first silencing member disposed in this way in the present disclosure, on the one hand, noise can be absorbed by the blades themselves, for example, due to collisions between the airflow and the blades. Especially in the case where a plurality of blades are disposed along the circumferential direction, it is allowed to absorb noise to a greater extent.

[0009] On the other hand, by virtue of the airflow channel formed between every two adjacent blades, the airflow is allowed to enter the first gap, thereby further extending a flow passage to reduce the noise. Moreover, the airflow entering the first gap will not be discharged through the first housing. On the contrary, a part of the airflow entering the first gap will return into the first airflow path through the airflow channel and can only be discharged through the first airflow outlet in the first silencing member. In this way, the flow passage for the airflow is further extended. During this process, collisions that may occur between airflows will also reduce a velocity and energy of the airflow.

[0010] In addition, the airflow entering the first gap will also undergo refraction and / or reflection on the inner wall of the first housing. Through the interaction between the airflow and the inner wall of the first housing, the velocity and energy of the airflow are further reduced, thereby reducing the noise.

[0011] Therefore, even in a compact space, the flow passage for the airflow can be significantly extended, and the velocity and energy of the airflow can be significantly reduced, thereby achieving a good noise reduction effect.

[0012] According to some embodiments of the present disclosure, an angle between an extension direction of the gas channel and the first direction is within a range of 0° to 45°.

[0013] Surprisingly, the inventor of the present disclosure found a correlation between the noise reduction effect and the angle between the extension direction of the gas channel and the flow direction of the airflow. When the angle between the extension direction of the gas channel and the flow direction of the airflow in the first airflow path is within the range of 0° to 45°, it is allowed to achieve a good noise reduction effect.

[0014] According to some embodiments of the present disclosure, the first silencing member further includes at least one barrier portion. The barrier portion protrudes outwards from the first silencing member to abut against the inner wall of the first housing, so as to prevent the airflow entering the first gap from passing through the barrier portion along the circumferential direction. The barrier portion can be positioned close to the first airflow outlet. According to some embodiments of the present disclosure, the first silencing member includes two barrier portions located on two sides of the first airflow outlet respectively.

[0015] By virtue of the barrier portion, the airflow in the first gap cannot be discharged directly through the first airflow outlet, but must return into the first airflow path through the airflow channel, thereby allowing for further extension of the flow passage in a narrow and small space.

[0016] According to some embodiments of the present disclosure, the width of the first gap along a radial direction is within a range of 0.2 mm to 5 mm. By virtue of the first gap that is very small, a good noise reduction effect can be achieved, thereby allowing for significant improvement of the compactness of a device.

[0017] According to some embodiments of the present disclosure, the first silencing member is annular. In some embodiments, the first silencing member may be a silencing cover.

[0018] According to some embodiments of the present disclosure, the gas channel is tapered along the radial direction.

[0019] According to some embodiments of the present disclosure, the cross section of any one of the at least two blades is in the shape of a water droplet.

[0020] By virtue of the tapered gas channel or the blades in the water droplet shape, it is allowed to enhance the refraction and / or reflection of the airflow on the blades, so as to further reduce the velocity and energy of the airflow.

[0021] According to some embodiments of the present disclosure, the first silencing member further includes a plurality of first holes for absorbing noise, where the first holes are located near the first airflow outlet. The formation of the plurality of first holes on the first silencing member contributes to enhancing the refraction and / or reflection of the airflow, so as to further reduce the velocity and energy of the airflow, which contributes to noise absorption.

[0022] According to some embodiments of the present disclosure, the silencing assembly further includes a second silencing member and a second housing. The second silencing member is located on an outer side of the first housing. A second airflow path is formed between the first housing and the second silencing member, and the airflow discharged from the first airflow path through the first airflow outlet is capable of entering the second airflow path. The second silencing member includes at least one second airflow outlet to allow discharge of the airflow in the second airflow path. The second housing is located on an outer side of the second silencing member and closely fits with the second silencing member.

[0023] In this way, on the basis of the noise reduction effect achieved by the first silencing member as above, the silencing assembly in the present disclosure further allows for further implementation of dual silencing, that is, dual air passages are achieved by the first airflow path located on an inner side and the second airflow path located on an outer side, thereby significantly extending the flow passage for the airflow. Moreover, the first airflow path and the second airflow path are arranged as coaxial annular flow passages, requiring only a very small space. Therefore, the silencing assembly proposed in the present disclosure allows for an excellent noise reduction effect to be achieved in a very compact space.

[0024] According to some embodiments of the present disclosure, the first housing includes at least one first airflow guide member to guide the airflow discharged from the first airflow path to flow along the first direction and / or a second direction separately in the second airflow path, where the second direction is opposite to the first direction.

[0025] According to some embodiments of the present disclosure, the second housing includes at least one second airflow guide member to guide the airflow discharged from the second airflow path to flow along the first direction and / or the second direction separately after leaving the second airflow outlet.

[0026] The airflow is guided by virtue of the first and / or second airflow guide member to flow along two opposite directions separately, and ultimately converges, so as to form a bidirectional wraparound air passage, which allows for further improvement in noise reduction.

[0027] According to some embodiments of the present disclosure, the second airflow outlet and the first airflow outlet are arranged to be opposite to each other in a radial direction.

[0028] According to some embodiments of the present disclosure, a second gap is formed between an inner wall of the second silencing member and an outer wall of the first housing, and the width of the second gap along a radial direction does not exceed 5 mm.

[0029] According to some embodiments of the present disclosure, the second silencing member includes a plurality of second holes, where the second holes are through holes, thereby forming a plurality of dense cavity structures with the second housing to enhance sound wave refraction and / or reflection. Alternatively or additionally, the second holes of the second silencing member may also be blind holes.

[0030] According to an example in another aspect of the present disclosure, a silencing system for a motor is provided. The silencing system includes any one silencing assembly as described above, where the first silencing member is arranged between the motor and the first housing, the first airflow path is formed between the inner wall of the first silencing member and an outer wall of the motor, and the airflow discharged from the motor flows along the first direction in the first airflow path. The second airflow path is formed between the outer wall of the first housing and the inner wall of the second silencing member, and the airflow discharged from the first airflow path through the first airflow outlet can enter the second airflow path and is discharged through the second airflow outlet.

[0031] According to some embodiments of the present disclosure, the silencing system further includes a shock-absorbing pad and / or a silencing material.

[0032] According to an example in yet another aspect of the present disclosure, a cleaning device is provided. The cleaning device includes a cleaning assembly, a power apparatus, and any one silencing system as described above, where the silencing system is configured to reduce noise of the power apparatus. By virtue of the silencing system in the present disclosure, the noise of the cleaning device in use is significantly reduced without reducing its aerodynamic performance, thereby significantly improving the user experience. Experiments conducted by the inventor have proved that under the same conditions, the use of the silencing system in the present disclosure allows for noise reduction of 3-4 dB(A) and significant improvement in sound quality. Moreover, researches have shown that people can easily recognize noise differences of 2-3 dB(A). Therefore, consumers can obviously perceive the noise reduction effect achieved by the present disclosure, and their usage experience is greatly improved.

[0033] These and other aspects of the present disclosure will become clear and clarified with reference to the embodiments described below.BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to better understand the present disclosure and to more clearly illustrate how to implement the same, reference is now made by way of example only to the accompanying drawings, in which: FIG. 1 schematically shows a schematic diagram of a part of a cleaning device according to an embodiment of the present disclosure; FIG. 2 schematically shows a longitudinal sectional view of a silencing system according to an embodiment of the present disclosure; FIG. 3 schematically shows an exploded view of a silencing system according to an embodiment of the present disclosure; FIG. 4 schematically shows a transverse sectional view of a silencing system according to an embodiment of the present disclosure from a top angle of view; FIG. 5 schematically shows a transverse sectional view of a silencing assembly according to an embodiment of the present disclosure from a bottom angle of view; FIG. 6 schematically shows a transverse sectional view of a silencing assembly according to another embodiment of the present disclosure from a bottom angle of view; FIG. 7 schematically shows a top view of a first silencing member according to an embodiment of the present disclosure; FIG. 8 schematically shows a side view of a first silencing member in FIG. 6; FIG. 9 schematically shows a top view of a first silencing member according to another embodiment of the present disclosure; and FIG. 10 schematically shows a top view of a first silencing member according to yet another embodiment of the present disclosure. DESCRIPTION OF THE EMBODIMENTS

[0035] The present disclosure will be described with reference to the accompanying drawings. It should be understood that although the detailed description and specific examples indicate exemplary embodiments of a silencing assembly, a silencing system, and a cleaning device, they are only intended for illustrative purposes and not intended to limit the scope of the present disclosure. These and other features, aspects, and advantages of the silencing assembly, the silencing system, and the cleaning device in the present disclosure can be better understood in combination with the following descriptions, the appended claims, and the accompanying drawings. It should be understood that the accompanying drawings are only schematic and not drawn to scale. It should also be understood that the same reference signs denote the same or similar components in the entire drawings.

[0036] FIG. 1 shows a partial schematic diagram of a cleaning device 1 according to an embodiment of the present disclosure. For example, the device may be a vacuum cleaner, a floor scrubber or another cleaning device that uses wet cleaning, or another electric device that uses a power apparatus. This is only an exemplary demonstration, and the present disclosure is not limited to this. The cleaning device 1 includes a cleaning assembly, a power apparatus, and a silencing system 10 for reducing noise generated by the power apparatus. The cleaning assembly is configured to perform cleaning operation, and includes a dust collection pipe, etc. The power apparatus is configured to provide power for the cleaning operation, and is, for example, a motor, a fan, etc. The silencing system 10 is configured to reduce the noise generated by the power apparatus during operation. Although the figure shows that the silencing system 10 is located at a handle of the cleaning device 1, the present disclosure is not limited to the position as shown in the figure, but may be disposed at any suitable position.

[0037] Referring to FIG. 2 to FIG. 4, exemplary embodiments of the silencing system 10 are shown. FIG. 2 shows a longitudinal sectional view of a silencing system 10 that has been assembled, FIG. 3 shows an exploded view of a silencing system 10, and FIG. 4 shows a transverse sectional view of a silencing system 10 from a top angle of view. The silencing system can be applicable to any suitable power apparatus, such as the motor 20. For the sake of simplification, the motor is used as an example for description below, but the present disclosure is not limited to this. As shown in FIG. 2, the motor 20 is accommodated in the silencing system 10, and a housing 30 is circumferentially disposed on an outer side of the motor 20. An end cover 40 is disposed at an end part of the housing 30, and a first shock-absorbing pad 50 is disposed between the end cover 40 and the motor. The silencing system 10 further includes a silencing assembly 300 located around the motor 20. A gap is formed along a radial direction between the silencing assembly 300 and the motor 20. In some embodiments, the gap is roughly annular. The air in the external environment enters the motor through a front cover, is circulated inside the motor and then discharged out of the motor, and enters the gap between the silencing assembly 300 and the motor 20.

[0038] FIG. 5 schematically shows an exemplary embodiment of a silencing assembly 300 according to the present disclosure from a bottom angle of view. The silencing assembly 300 includes a first silencing member 100 located on the outer side of the motor 20. The silencing assembly 300 further includes a first housing 110, where the first silencing member 100 is configured to be disposed on an inner side of the first housing 110 and assembled in the first housing 110. A first gap G1 is formed between an outer wall of the first silencing member 100 and an inner wall of the first housing 110, as shown in FIG. 4. In some embodiments, the width of the first gap G1 along a radial direction is within a range of 0.2 mm to 5 mm. Referring to FIG. 4, an inner wall of the first silencing member 100 further defines a first airflow path P1, and an airflow in the first airflow path P1 flows along a first direction F1. Exemplarily, from the angle of view in FIG. 4, it is shown that the first direction F1 is a counterclockwise direction, and a second direction F2 is a clockwise direction, but the present disclosure is not limited to this.

[0039] Referring to FIG. 5, the first silencing member 100 includes at least one first airflow outlet 101. The first airflow outlet 101 communicates with the first airflow path P1. The airflow in the first airflow path P1 is discharged only through the first airflow outlet 101. In some embodiments, the first airflow outlet 101 can extend radially from the first airflow path P1. Although it is shown in FIG. 5 that the first silencing member 100 includes four first airflow outlets 101, the present disclosure is not limited to this.

[0040] The first silencing member 100 further includes at least two blades 102. The at least two blades 102 are disposed along a circumferential direction. In some embodiments, the first silencing member 100 includes a plurality of blades 102 disposed along the circumferential direction. A gas channel 103 is formed between every two adjacent blades 102, such that the airflow from the first airflow path P1 is allowed to enter the first gap G1 through the gas channel 103, for example, as shown by a dashed arrow that is outward along the radial direction in FIG. 5. In addition, these gas channels 103 also allow a part of the airflow to return from the first gap G1 into the first airflow path P1, as shown by a dashed arrow that is inward along the radial direction in FIG. 5.

[0041] The airflow in the first airflow path P1 flows along the first direction F1. From the bottom angle of view in FIG. 5, the first direction is clockwise. In some embodiments, as shown in FIG. 5, an angle between an extension direction F of the gas channel 103 and the first direction F1 is within a range of 0° to 45°. The inventor of the present disclosure found that the range of angle is particularly advantageous to allow for a good noise reduction effect to be achieved by the first silencing member disposed in this way.

[0042] In some embodiments, as shown in FIG. 5, the first silencing member 100 further includes at least one barrier portion 104 located near the first airflow outlet 101. In some embodiments, the first silencing member includes two barrier portions 104 located on two sides of the first airflow outlet 101 respectively. The barrier portion 104 protrudes outwards from the first silencing member 100 to abut against the inner wall of the first housing 110, so as to prevent the airflow entering the first gap G1 from passing through the barrier portion 104 along the circumferential direction. Due to the barrier portion 104, the airflow entering the first gap G1 cannot directly enter the first airflow outlet 101. The collision between the airflow and the barrier portion also allows for further reduction in energy of the airflow. A part of the airflow returns into the first airflow path through the airflow channel 103, thereby leaving the first silencing member 100 through the first airflow outlet 101.

[0043] As shown in FIG. 5, the first housing 110 further includes at least one first airflow guide member 111 to guide the airflow discharged from the first airflow path. In some embodiments, the first airflow guide member 111 includes a bent portion that bends towards a desired flow direction of the airflow from an outer wall of the first housing. In some embodiments, the first airflow guide member 111 may be integrally formed with the first housing 110. In some other embodiments, the first airflow guide member 111 may be formed separately and attached to the first housing 110. In some embodiments, referring to FIG. 4, the first airflow guide member 111 may guide the airflow discharged from the first airflow path to flow roughly along the first direction F1 in a second airflow path P2. In some embodiments, the first airflow guide member 111 may guide the airflow discharged from the first airflow path to flow roughly along the second direction F2 in the second airflow path P2, where the second direction F2 is opposite to the first direction F1. In some embodiments, the first airflow guide member 111 may also guide the airflow discharged from the first airflow path to flow along the first direction F1 and the second direction F2 separately in the second airflow path P2, as shown in FIG. 4.

[0044] FIG. 7 and FIG. 8 show a first silencing member 100 according to an embodiment of the present disclosure. In some embodiments, the first silencing member 100 further includes a plurality of first holes 105 for absorbing noise, where these first holes 105 are located near the first airflow outlet 101 to further absorb the noise.

[0045] FIG. 9 shows a first silencing member 100 according to another embodiment of the present disclosure, in which the gas channel 103 is tapered from an inner side to an outer side along the radial direction. The energy of the airflow passing through the gas channel can be further reduced through the tapered gas channel. In other embodiments, other settings or structures of the gas channel that contribute to noise reduction are also feasible.

[0046] FIG. 10 shows a first silencing member 100 according to another embodiment of the present disclosure, in which the cross section of any one of the at least two blades 102 is in the shape of a water droplet. In other embodiments, other shapes of the blade that contribute to noise reduction are also feasible.

[0047] Referring to FIG. 4 and FIG. 6, in some embodiments, the silencing assembly 300 further includes a second silencing member 200 located on an outer side of the first housing 110. The second airflow path P2 is formed between the first housing 110 and the second silencing member 200, and the airflow discharged from the first airflow path P1 through the first airflow outlet 101 is capable of entering the second airflow path P2. The second silencing member 200 includes at least one second airflow outlet 201 to allow discharge of the airflow in the second airflow path P2.

[0048] In some embodiments, a second gap G2 is formed between an inner wall of the second silencing member 200 and the outer wall of the first housing 110. In some embodiments, the width of the second gap along a radial direction does not exceed 5 mm.

[0049] In some embodiments, referring to FIG. 4 and FIG. 6, the silencing assembly 300 further includes a second housing 210 that is located on an outer side of the second silencing member 200 and closely fits with the second silencing member 200.

[0050] In some embodiments, the second housing includes at least one second airflow guide member 211, as shown in FIG. 6. In some embodiments, the second airflow guide member 211 includes a bent portion that bends towards the desired flow direction of the airflow from an outer wall of the second housing. In some embodiments, the second airflow guide member 211 may be integrally formed with the second housing. In some other embodiments, the second airflow guide member 211 may be formed separately and attached to the second housing. In some embodiments, the second airflow guide member 211 guides the airflow discharged from the second airflow path P2 to flow along the first direction F1 and / or the second direction F2 after leaving the second airflow outlet 201. Then, the airflow can be discharged through an outlet on the housing 30.

[0051] In some embodiments, the second airflow outlet 201 and the first airflow outlet 101 are arranged to be opposite to each other in a radial direction. In this way, the flow passage for the airflow is extended to the maximum extent.

[0052] In some embodiments, the second silencing member 200 may include a plurality of second holes (not shown). In some embodiments, the second holes are through holes, thereby forming a plurality of dense cavity structures with the second housing 210 to enhance sound wave refraction and / or reflection. In other embodiments, the second holes may be blind holes.

[0053] In some embodiments, as shown in FIG. 2 and FIG. 3, a second shock-absorbing pad 60 is disposed between the motor 20 and the second housing 210. In some embodiments, additionally or alternatively, a third shock-absorbing pad 70 is disposed between the second housing 210 and the housing 30.

[0054] The flow path for the airflow is further explained with reference to FIG. 4. The airflow discharged from the motor flows roughly along the first direction F1 in the first airflow path P1. The airflow in the first airflow path P1 leaves the first silencing member 100 through the first airflow outlet 101 when flowing to the first airflow outlet 101. A part of the airflow in the first airflow path P1 will collide with the blades to be refracted and / or reflected, thereby reducing its energy. A part of the airflow in the first airflow path P1 will enter the first gap G1 separately through the plurality of gas channels 103. A part of the airflow entering the first gap G1 will collide with the first housing, thereby reducing its energy. Moreover, the airflow entering the first gap G1 cannot leave the first silencing member through the first airflow outlet 101 due to the existence of the barrier portion, and the remaining airflow can only return into the first airflow path P1 through the gas channel 103, thereby further extending the flow passage. Therefore, the airflow in the first airflow path P1 can only leave the first silencing member 100 through the first airflow outlet 101. During this process, the energy of the airflow has been significantly attenuated.

[0055] By virtue of the first airflow guide member 111 on the first housing, the airflow leaving the first silencing member 100 and the first housing 110 can be guided to flow along the first direction F1 and / or the second direction F2 in the second airflow path P2. In the case of flowing along the first direction F1 and the second direction F2 separately, two airflows along opposite directions will collide, such that the velocity of the airflow is reduced, thereby further attenuating the overall energy of the airflow. The airflow in the second airflow path P2 leaves the second silencing member 200 through the second airflow outlet 201. During this process, the energy of the airflow is further attenuated.

[0056] By virtue of the second airflow guide member 211 on the second housing, the airflow leaving the second silencing member 200 and the second housing 210 can be guided to flow along the first direction F1 and / or the second direction F2. Then, the remaining airflow with low energy is discharged out of the silencing system 10 through the outlet on the housing 30. Thus, compared with the prior art, a good noise reduction effect is further achieved.

[0057] By virtue of the silencing assembly and the silencing system according to the embodiments of the present disclosure, a dual-air-passage bidirectional wraparound design can be implemented, such that the flow passage is significantly extended, and a wind velocity is greatly reduced, thereby significantly improving the noise reduction effect, and implementing efficient noise reduction in a compact space. Based on the experiments, under the same conditions, the silencing assembly according to the embodiment of the present disclosure can achieve the noise reduction effect of 3-4 dB(A), which is noise reduction that can be obviously perceived by people. Moreover, the silencing assembly according to the embodiment of the present disclosure also improves the noise quality, making the noise sound relatively soft. Meanwhile, the aerodynamic performance is not significantly compromised or only slightly compromised.

[0058] In the process of implementing the claimed invention, those skilled in the art can understand and implement the variants of the disclosed embodiments by learning the drawings, the disclosure and the appended claims. In the claims, the term "comprise" does not exclude other elements or steps, and the indefinite article "a / an" or "one" does not exclude a plurality of. The features described in different dependent claims or embodiments may be combined as far as technically feasible.

[0059] The previous description has been described with reference to specific embodiments. However, the above illustrative discussion is not intended to be exhaustive or to limit the present disclosure to the precise form described. In view of the above teachings, many modifications and changes are possible. Thus, others skilled in the art can make the best use of technologies and various embodiments with various modifications suitable for various purposes.

[0060] While the present disclosure and examples have been described with reference to the accompanying drawings, various changes and modifications will become apparent to those skilled in the art. These changes and modifications shall be understood to be included within the scope of the present disclosure.

Examples

Embodiment Construction

[0035]The present disclosure will be described with reference to the accompanying drawings. It should be understood that although the detailed description and specific examples indicate exemplary embodiments of a silencing assembly, a silencing system, and a cleaning device, they are only intended for illustrative purposes and not intended to limit the scope of the present disclosure. These and other features, aspects, and advantages of the silencing assembly, the silencing system, and the cleaning device in the present disclosure can be better understood in combination with the following descriptions, the appended claims, and the accompanying drawings. It should be understood that the accompanying drawings are only schematic and not drawn to scale. It should also be understood that the same reference signs denote the same or similar components in the entire drawings.

[0036]FIG. 1 shows a partial schematic diagram of a cleaning device 1 according to an embodiment of the present discl...

Claims

1. A silencing assembly (300), comprising: a first housing (110); and a first silencing member (100), the first silencing member (100) being configured to be disposed on an inner side of the first housing (110) and assembled in the first housing (110), wherein a first gap (G1) is formed between an outer wall of the first silencing member (100) and an inner wall of the first housing (110), an inner wall of the first silencing member (100) defines a first airflow path (P1), an airflow in the first airflow path (P1) flows along a first direction (F1), and the first silencing member (100) comprises: at least one first airflow outlet (101), wherein the airflow in the first airflow path (P1) is discharged only through the first airflow outlet (101); and at least two blades (102), wherein the at least two blades (102) are disposed along a circumferential direction, and a gas channel (103) is formed between two adjacent blades in the at least two blades (102), such that the airflow from the first airflow path (P1) is allowed to enter the first gap (G1) through the gas channel (103), and a part of the airflow is allowed to return from the first gap (G1) into the first airflow path (P1).

2. The silencing assembly (300) according to claim 1, characterized in that an angle between an extension direction (F) of the gas channel (103) and the first direction (F1) is within a range of 0° to 45°.

3. The silencing assembly (300) according to claim 1, characterized in that the first silencing member (100) further comprises two barrier portions (104) located on two sides of the first airflow outlet (101) respectively, and the barrier portions (104) protrude outwards from the first silencing member (100) to abut against the inner wall of the first housing (110), so as to prevent the airflow entering the first gap (G1) from passing through the barrier portions along the circumferential direction.

4. The silencing assembly (300) according to claim 1, characterized in that the width of the first gap (G1) along a radial direction is within a range of 0.2 mm to 5 mm.

5. The silencing assembly (300) according to claim 1, characterized in that the gas channel (103) is tapered from an inner side to an outer side along a radial direction.

6. The silencing assembly (300) according to claim 1, characterized in that the cross section of any one of the at least two blades (102) is in the shape of a water droplet.

7. The silencing assembly (300) according to claim 1, characterized in that the first silencing member (100) further comprises a plurality of first holes (105) for absorbing noise, and the first holes (105) are located near the first airflow outlet (101).

8. The silencing assembly (300) according to any one of claims 1 to 7, characterized by further comprising: a second silencing member (200) located on an outer side of the first housing (110), a second airflow path (P2) being formed between the first housing (110) and the second silencing member (200), the airflow discharged from the first airflow path (P1) through the first airflow outlet (101) being capable of entering the second airflow path (P2), wherein the second silencing member (200) comprises at least one second airflow outlet (201) to allow discharge of the airflow in the second airflow path (P2); and a second housing (210), wherein the second housing is located on an outer side of the second silencing member (200) and closely fits with the second silencing member (200).

9. The silencing assembly (300) according to claim 8, characterized in that the first housing (110) comprises at least one first airflow guide member (111) to guide the airflow discharged from the first airflow path to flow along the first direction (F1) and / or a second direction (F2) separately in the second airflow path (P2), wherein the second direction is opposite to the first direction.

10. The silencing assembly (300) according to claim 8, characterized in that the second housing comprises at least one second airflow guide member (211) to guide the airflow discharged from the second airflow path (P2) to flow along the first direction (F1) and / or a second direction (F2) separately after leaving the second airflow outlet (201).

11. The silencing assembly (300) according to claim 8, characterized in that the second airflow outlet (201) and the first airflow outlet (101) are arranged to be opposite to each other in a radial direction.

12. The silencing assembly (300) according to claim 8, characterized in that a second gap (G2) is formed between an inner wall of the second silencing member (200) and an outer wall of the first housing (110), and the width of the second gap along a radial direction does not exceed 5 mm.

13. The silencing assembly (300) according to claim 8, characterized in that the second silencing member (200) comprises a plurality of second holes, and the second holes are through holes, thereby forming a plurality of dense cavity structures with the second housing (210) to enhance sound wave refraction and / or reflection.

14. A silencing system (10) for a motor (20), characterized by comprising the silencing assembly (300) according to any one of claims 1 to 13, wherein the first silencing member (100) is arranged between the motor (20) and the first housing (110), the first airflow path (P1) is formed between the inner wall of the first silencing member (100) and an outer wall of the motor (20), and the airflow discharged from the motor (20) flows along the first direction (F1) in the first airflow path (P1).

15. A cleaning device (1), characterized by comprising a cleaning assembly, a power apparatus, and the silencing system (10) according to claim 14, wherein the silencing system (10) is configured to reduce noise of the power apparatus.

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