Silencing assembly, silencing system for motor and cleaning equipment

Abstract

The utility model relates to a silencing assembly. The silencing assembly comprises a first shell; the first silencing part is configured to be arranged on the inner side of the first shell and assembled to the first shell, a first gap is formed between the outer wall of the first silencing part and the inner wall of the first shell, the inner wall of the first silencing part defines a first air flow path, and the first air flow path is communicated with the first gap. Airflow in the first airflow path flows in a first direction. The first silencing part comprises at least one first airflow outlet and at least two blades arranged in the circumferential direction, airflow in the first airflow path is exhausted only through the first airflow outlet, and an air channel is formed between every two adjacent blades in the at least two blades. The first gap is configured such that airflow from the first airflow path is allowed to enter the first gap via the gas passage, and a portion of the airflow is allowed to return from the first gap into the first airflow path.

Description

Technical Field

[0001] The present disclosure relates to a sound attenuation assembly for reducing noise, as well as a sound attenuation system for an electric motor and a cleaning device including such a sound attenuation system. Background Art

[0002] In applications where a power device (such as a motor) is used to drive the airflow, significant noise is generated when the airflow passes through various cavities. This type of noise is usually called aerodynamic noise. The current noise reduction structure often hinders the discharge of airflow, heat dissipation, or reduces the aerodynamic performance of the power device. Therefore, how to reduce noise without significantly affecting various performances has become a difficult problem. In addition, a commonly used method is to set up sound-absorbing materials, such as sound-absorbing sponges. However, the noise reduction effect achieved by such means is not ideal. This is because, in order to achieve the ideal noise reduction effect, a sound-absorbing material of a considerable size needs to be set, which is not practical for equipment that requires a compact structure. Therefore, how to reduce noise in a compact space also faces a big problem.

[0003] For example, cleaning equipment is increasingly used, and as people's living standards improve, the demand for household cleaning equipment such as vacuum cleaners and floor scrubbers is also increasing. Noise is a crucial consideration for users when choosing household cleaning equipment, and traditional vacuum cleaners and floor scrubbers usually produce a lot of noise, especially when the motor rotates at high speed, which greatly reduces the user experience. Moreover, household cleaning equipment needs to be as small and lightweight as possible.

[0004] At present, some cleaning equipment reduces noise by installing a double motor cover noise reduction structure including a motor inner cover and a motor outer cover outside the motor, and filling a silencer sponge in the air duct between the motor inner cover and the motor outer cover to reduce noise energy. However, the noise reduction effect of this cleaning equipment is not ideal, and it still emits a large noise during use. Moreover, this technical solution will cause the motor cover to be larger in size.

[0005] Therefore, a noise reduction solution is needed that can overcome the above-mentioned defects. Utility Model Content

[0006] The present disclosure aims to propose a better solution to the above problems, so that the noise is reduced as much as possible, while also achieving compactness of the device. In the case of a cleaning device comprising a motor, at the same time, the aerodynamic performance of the cleaning device is not lost.

[0007] According to an example of one aspect of the present disclosure, a muffler assembly is provided. The muffler assembly includes a first shell and a first muffler. The first muffler is configured to be arranged inside the first shell and assembled to the first shell. A first gap is formed between the outer wall of the first muffler and the inner wall of the first shell. The inner wall of the first muffler defines a first airflow path. The airflow in the first airflow path flows in a first direction. The first muffler 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 arranged in a circumferential direction. A gas channel is formed between two adjacent blades of the at least two blades, so that the airflow from the first airflow path is allowed to enter the first gap via the gas channel, and a portion of the airflow is allowed to return from the first gap to the first airflow path.

[0008] By means of the first sound-absorbing member thus arranged in the present disclosure, on the one hand, noise can be absorbed by the blade itself, for example, due to collision of the airflow with the blade. Especially when a plurality of blades are arranged in the circumferential direction, greater noise absorption is allowed.

[0009] On the other hand, by means of a plurality of airflow channels formed between each two adjacent blades, the airflow is allowed to enter the first gap, thereby further extending the flow channel to reduce noise. Moreover, the airflow entering the first gap will not be discharged through the first shell. On the contrary, a portion of the airflow entering the first gap will return to the first airflow path through the airflow channel and can only be discharged through the first airflow outlet in the first silencer. In this way, the flow channel of the airflow is further extended. In this process, possible collisions between airflows will also reduce the speed and energy of the airflow.

[0010] In addition, the airflow entering the first gap will also be refracted and / or reflected on the inner wall of the first shell. The airflow interacts with the inner wall of the first shell to further reduce the speed and energy of the airflow, thereby reducing noise.

[0011] Therefore, even in a compact space, the flow path for the airflow can be significantly extended, and the speed 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 in a range of 0 degrees to 45 degrees.

[0013] Surprisingly, the inventors of the present disclosure have found that the noise reduction effect is correlated with 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 in the range of 0 to 45 degrees, a good noise reduction effect is allowed.

[0014] According to some embodiments of the present disclosure, the first muffler also includes at least one blocking portion. The blocking portion protrudes outward from the first muffler to abut against the inner wall of the first shell to prevent the airflow entering the first gap from passing through the blocking portion in the circumferential direction. The blocking portion can be positioned close to the first airflow outlet. In some embodiments, the first muffler includes two blocking portions respectively located on both sides of the first airflow outlet.

[0015] By means of the blocking portion, the airflow in the first gap cannot be discharged directly through the first airflow outlet, but must return to the first airflow path via the airflow channel, thereby allowing the flow channel to be further extended in a narrow space.

[0016] According to some embodiments of the present disclosure, the width of the first gap in the radial direction is in the range of 0.2 mm to 5 mm. With the help of a very small first gap, a good noise reduction effect can be achieved, thereby allowing the compactness of the device to be significantly improved.

[0017] According to some embodiments of the present disclosure, the first sound-absorbing member is annular. In some embodiments, the first sound-absorbing member can be a sound-absorbing cover.

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

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

[0020] By means of tapered gas channels or teardrop-shaped blades, it is possible to increase the refraction and / or reflection of the airflow on the blades, thereby further reducing its speed and energy.

[0021] According to some embodiments of the present disclosure, the first muffler also includes a plurality of holes for absorbing noise, and the first hole is located near the first airflow outlet. Providing a plurality of first holes on the first muffler helps to increase the refraction and / or reflection of the airflow, thereby further reducing its speed and energy, which helps to absorb noise.

[0022] According to some embodiments of the present disclosure, the muffler assembly further includes a second muffler and a second shell. The second muffler is located outside the first shell. A second airflow path is formed between the first shell and the second muffler, and the airflow discharged from the first airflow path via the first airflow outlet can enter the second airflow path. The second muffler includes at least one second airflow outlet to allow the airflow in the second airflow path to be discharged. The second shell is located outside the second muffler and is tightly matched with the second muffler.

[0023] In this way, on the basis of the noise reduction effect achieved by the first silencer as described above, the silencer assembly of the present disclosure also allows for further double silencer, that is, a double air duct is achieved by both the first airflow path located on the inside and the second airflow path located on the outside, which significantly extends the airflow flow path. Moreover, the first airflow path and the second airflow path are arranged as a coaxial annular flow channel, which only requires a very small space. Therefore, the silencer assembly proposed in the present disclosure allows for excellent noise reduction effect in a very compact space.

[0024] According to some embodiments of the present disclosure, the first housing includes at least one first airflow guide to guide the airflow discharged from the first airflow path to flow in the second airflow path along a first direction and / or a second direction, respectively, wherein 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 to guide the airflow exhausted from the second airflow path to flow in the first direction and / or the second direction after leaving the second airflow outlet.

[0026] The airflow is guided to flow in two opposite directions by means of the first and / or second airflow guides, and finally converges to form a two-way surrounding air duct, thereby further improving the noise reduction effect.

[0027] According to some embodiments of the present disclosure, the second air flow outlet and the first air flow 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 the inner wall of the second muffler and the outer wall of the first shell, and the width of the second gap along the radial direction does not exceed 5 mm.

[0029] According to some embodiments of the present disclosure, the second muffler includes a plurality of second holes, which are through holes, so as to form a plurality of dense cavity structures with the second shell to increase sound wave refraction and / or reflection. Alternatively or additionally, the second holes of the second muffler may also be blind holes.

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

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

[0032] According to an example of another aspect of the present disclosure, a cleaning device is provided. The cleaning device includes: a cleaning component, a power device and any silencing system as described above, and the silencing system is used to reduce the noise of the power device. By means of the silencing system including the present disclosure, the noise of the cleaning device during use is significantly reduced without reducing the aerodynamic performance of the cleaning device, which significantly improves the user experience. Experiments conducted by the inventors have shown that, under the same conditions, the silencing system of the present disclosure allows the noise to be reduced by 3-4dB (A) and the sound quality is significantly improved. Moreover, studies have shown that people can usually easily identify a noise difference of 2-3dB (A). Therefore, consumers can clearly perceive the noise reduction effect achieved by the present disclosure, which greatly improves their user experience.

[0033] These and other aspects of the disclosure will be apparent from and elucidated with reference to the embodiments described hereinafter. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] For a better understanding of the present disclosure, and in order to more clearly show how the same may be carried into effect, reference is now made, by way of example only, to the accompanying drawings, in which:

[0035] Figure 1 A schematic diagram schematically shows a portion of a cleaning device according to an embodiment of the present disclosure.

[0036] Figure 2 A longitudinal cross-sectional view of a noise reduction system according to an embodiment of the present disclosure is schematically shown.

[0037] Figure 3 An exploded view of a sound attenuation system according to an embodiment of the present disclosure is schematically shown.

[0038] Figure 4 A transverse cross-sectional view from a top view of a noise reduction system according to an embodiment of the present disclosure is schematically shown.

[0039] Figure 5 A transverse cross-sectional view from a bottom perspective of a sound-absorbing assembly according to an embodiment of the present disclosure is schematically shown.

[0040] Figure 6 A transverse cross-sectional view from a bottom perspective of a sound-absorbing assembly according to another embodiment of the present disclosure is schematically shown.

[0041] Figure 7 A top view of a first sound-absorbing member according to an embodiment of the present disclosure is schematically shown.

[0042] Figure 8 Schematically shows Figure 6 A side view of the first muffler.

[0043] Fig. 9 A top view of a first sound-absorbing member according to another embodiment of the present disclosure is schematically shown.

[0044] Fig.10 A top view of a first sound-absorbing member according to yet another embodiment of the present disclosure is schematically shown. DETAILED DESCRIPTION

[0045] The present disclosure will be described below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, although indicating exemplary embodiments of the muffler assembly, the muffler system, and the cleaning device, are intended for illustrative purposes only and are not intended to limit the scope of the present disclosure. These and other features, aspects, and advantages of the muffler assembly, the muffler system, and the cleaning device of the present disclosure can be better understood in conjunction with the following description, the appended claims, and the accompanying drawings. It should be understood that the drawings are merely schematic and are not drawn to scale. It should also be understood that the same reference numerals represent the same or similar parts throughout the drawings.

[0046] Figure 1 A partial schematic diagram of an exemplary cleaning device 1 according to the present disclosure is shown. For example, the device can be a vacuum cleaner, or a cleaning device such as a floor scrubber that uses wet cleaning, or other electric devices that use a power device. This is only an exemplary display, and the present disclosure is not limited to this. The cleaning device 1 includes a cleaning component, a power device, and a silencer system 10 for reducing the noise generated by the power device. The cleaning component is used to perform cleaning operations, including a dust collection duct, etc. The power device is used to provide power for the cleaning operation, such as a motor, a fan, etc. The silencer system 10 is used to reduce the noise generated by the power device during operation. Although the figure shows that the silencer system 10 is located at the handle of the cleaning device 1, the present disclosure is not limited to the figure, but can be set at any suitable position.

[0047] Reference Figure 2-Figure 4 , an exemplary embodiment of a sound attenuation system 10 is shown. Figure 2 , a longitudinal cross-sectional view of the assembled silencer system 10 is shown. Figure 3 An exploded view of the muffler system 10 is shown in FIG. Figure 4 A cross-sectional view of the muffler system 10 is shown from a top view. The muffler system can be applied to any suitable power device, such as a motor 20. For simplicity, the motor is used as an example for description below, but the present disclosure is not limited thereto. Figure 2As shown, the motor 20 is accommodated in the muffler system 10, and the housing 30 is circumferentially arranged outside the motor 20. The end cover 40 is arranged at the end of the housing 30 and a first shock-absorbing pad 50 is provided between the end cover 40 and the motor. The muffler system 10 also includes a muffler assembly 300 located around the motor 20. A gap is included between the muffler assembly 300 and the motor 20 in the radial direction. In some embodiments, the gap is generally annular. The air in the external environment enters the motor through the front cover, is discharged from the motor after circulating inside the motor, and enters the gap between the muffler assembly 300 and the motor 20.

[0048] Figure 5 An exemplary embodiment of a muffler assembly 300 according to the present disclosure is schematically shown in a bottom view. The muffler assembly 300 includes a first muffler 100 located outside the motor 20. The muffler assembly 300 also includes a first housing 110, wherein the first muffler 100 is configured to be arranged inside the first housing 110 and assembled to the first housing 110. A first gap G1 is formed between an outer wall of the first muffler 100 and an inner wall of the first housing 110, as shown in FIG. Figure 4 In some embodiments, the width of the first gap G1 along the radial direction is in the range of 0.2 mm to 5 mm. Figure 4 , the inner wall of the first muffler 100 further defines a first airflow path P1, and the airflow in the first airflow path P1 flows along a first direction F1. Figure 4 , the first direction F1 is a counterclockwise direction, and the second direction F2 is a clockwise direction, but the present disclosure is not limited thereto.

[0049] Reference Figure 5 , the first silencer 100 includes at least one first airflow outlet 101. The first airflow outlet 101 is in communication 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 may extend radially from the first airflow path P1. Figure 5 2 and 3 , it is shown that the first muffler 100 includes four first air flow outlets 101 , but the present disclosure is not limited thereto.

[0050] The first muffler 100 further includes at least two blades 102. The at least two blades 102 are arranged in a circumferential direction. In some embodiments, the first muffler 100 includes a plurality of blades 102 arranged in a circumferential direction. A gas channel 103 is formed between each two adjacent blades 102, so that the gas flow from the first gas flow path P1 can enter the first gap G1 through the gas channel 103, for example, by Figure 5 In addition, these gas channels 103 also allow a portion of the gas flow to return from the first gap G1 to the first gas flow path P1, as shown by the dashed arrows pointing radially outward in FIG. Figure 5 Indicated by the dotted arrow pointing radially inward.

[0051] The airflow in the first airflow path P1 flows along the first direction F1. Figure 5 In an upward viewing angle, the first direction is clockwise. Figure 5 As shown in , the angle between the extension direction F of the gas channel 103 and the first direction F1 is in the range of 0 to 45 degrees. The inventors of the present disclosure have found that this angle range is particularly advantageous to allow a good noise reduction effect to be achieved by the first sound-absorbing member thus arranged.

[0052] In some embodiments, Figure 5 As shown, the first muffler 100 also includes at least one blocking portion 104 located near the first airflow outlet 101. In some embodiments, the first muffler includes two blocking portions 104 located on both sides of the first airflow outlet 101. The blocking portion 104 protrudes outward from the first muffler 100 to the inner wall of the first shell 110 to prevent the airflow entering the first gap G1 from passing through the blocking portion 104 in the circumferential direction. Due to the blocking portion 104, the airflow entering the first gap G1 cannot directly travel to the first airflow outlet 101. The collision of the airflow with the blocking portion also allows the energy of the airflow to be further reduced. A portion of the airflow returns to the first airflow path via the airflow channel 103, so that it leaves the first muffler 100 via the first airflow outlet 101.

[0053] like Figure 5 As shown, the first housing 110 further includes at least one first airflow guide 111 to guide the airflow discharged from the first airflow path. In some embodiments, the first airflow guide 111 includes a bent portion that bends from the outer wall of the first housing toward the direction in which the airflow is expected to flow. In some embodiments, the first airflow guide 111 can be integrally formed with the first housing 110. In other embodiments, the first airflow guide 111 can be separately formed and attached to the first housing 110. In some embodiments, refer to Figure 4 , the first airflow guide 111 can guide the airflow discharged from the first airflow path to flow generally along the first direction F1 in the second airflow path P2. In some embodiments, the first airflow guide 111 can guide the airflow discharged from the first airflow path to flow generally along the second direction F2 in the second airflow path P2, wherein the second direction F2 is opposite to the first direction F1. In some embodiments, the first airflow guide 111 can also guide the airflow discharged from the first airflow path to flow in the first direction F1 and the second direction F2 in the second airflow path P2, respectively. Figure 4 as shown in .

[0054] Figure 7-Figure 8The first sound attenuator 100 according to an embodiment of the present disclosure is shown. In some embodiments, the first sound attenuator 100 may further include a plurality of first holes 105 for absorbing noise, and the first holes 105 are located near the first air flow outlet 101 to further absorb noise.

[0055] Fig. 9 A first muffler 100 according to another embodiment of the present disclosure is shown, wherein the gas channel 103 is tapered from the inside to the outside in the radial direction. The energy of the airflow through the gas channel can be further reduced by the tapered gas channel. In other embodiments, other arrangements or structures of the gas channel that contribute to noise reduction are also feasible.

[0056] Fig.10 The first muffler 100 according to another embodiment of the present disclosure is shown, wherein the cross section of any blade 102 of the at least two blades is in the shape of a water drop. In other embodiments, other shapes of the blades that are helpful for noise reduction are also feasible.

[0057] Return to reference Figure 4 and Figure 6 In some embodiments, the muffler assembly 300 may further include a second muffler 200 located outside the first housing 110. A second airflow path P2 is formed between the first housing 110 and the second muffler 200, and the airflow discharged from the first airflow path P1 via the first airflow outlet 101 can enter the second airflow path P2. The second muffler 200 includes at least one second airflow outlet 201 to allow the airflow in the second airflow path P2 to be discharged.

[0058] In some embodiments, a second gap G2 is formed between the inner wall of the second muffler 200 and the outer wall of the first housing 110. In some embodiments, the width of the second gap along the radial direction does not exceed 5 mm.

[0059] In some embodiments, also refer to Figure 4 and Figure 6 The silencer assembly 300 further includes a second shell 210 , which is located outside the second silencer 200 and is tightly matched with the second silencer 200 .

[0060] In some embodiments, the second housing includes at least one second airflow guide 211, such as Figure 6In some embodiments, the second airflow guide 211 includes a bend that bends from the outer wall of the second shell toward the direction in which the airflow is expected to travel. In some embodiments, the second airflow guide 211 may be integrally formed with the second shell. In other embodiments, the second airflow guide 211 may be formed separately and attached to the second shell. In some embodiments, the second airflow guide 211 guides the airflow discharged from the second airflow path P2 to flow in the first direction F1 and / or the second direction F2 after leaving the second airflow outlet 201. Subsequently, the airflow may be discharged via an outlet on the housing 30.

[0061] In some embodiments, the second airflow outlet 201 and the first airflow outlet 101 are arranged to be opposite to each other in the radial direction, so as to maximize the length of the airflow channel.

[0062] In some embodiments, the second muffler 200 may include a plurality of second holes (not shown). In some embodiments, the second holes are through holes, so that a plurality of dense cavity structures are formed with the second shell 210 to increase sound wave refraction and / or reflection. In other embodiments, the second holes may be blind holes.

[0063] In some embodiments, Figure 2 and Figure 3 As shown, 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 casing 30 .

[0064] Reference Figure 4 The path of the airflow is further explained. The airflow discharged from the motor flows generally along the first direction F1 in the first airflow path P1. The airflow in the first airflow path P1 leaves the first muffler 100 via the first airflow outlet 101 when it travels to the first airflow outlet 101. A portion of the airflow in the first airflow path P1 will collide with the blades, refract and / or reflect, so that its energy is reduced. A portion of the airflow in the first airflow path P1 will enter the first gap G1 through a plurality of gas channels 103 respectively. A portion of the airflow entering the first gap G1 will collide with the first shell, so that its energy is reduced. Moreover, the airflow entering the first gap G1 cannot leave the first muffler via the first airflow outlet 101 due to the presence of the blocking portion, and the remaining airflow can only return to the first airflow path P1 again via the gas channel 103, thereby further extending the flow channel. Therefore, the airflow in the first airflow path P1 can only leave the first muffler 100 via the first airflow outlet 101. In this process, the airflow energy has been significantly attenuated.

[0065] By means of the first airflow guide 111 on the first shell, the airflow leaving the first muffler 100 and the first shell 110 can be guided to flow in the second airflow path P2 along the first direction F1 and / or the second direction F2. When flowing in the first direction F1 and the second direction F2 respectively, the two airflows in opposite directions will collide, so that the airflow speed is reduced, thereby further attenuating the overall energy of the airflow. The airflow in the second airflow path P2 leaves the second muffler 200 via the second airflow outlet 201. In this process, the airflow energy is further attenuated.

[0066] By means of the second airflow guide 211 on the second shell, the airflow leaving the second muffler 200 and the second shell 210 can be guided to flow along the first direction F1 and / or the second direction F2. Subsequently, the remaining low-energy airflow is discharged from the muffler system 10 through the outlet on the housing 30. Thus, compared with the prior art, a good noise reduction effect is further achieved.

[0067] With the aid of the silencer assembly and silencer system of the embodiment of the present disclosure, a dual-duct bidirectional surround design can be realized, so that the flow channel is significantly extended, the wind speed is greatly reduced, and the noise reduction effect is significantly improved, and efficient noise reduction can be achieved in a compact space. According to the experimental surface, under the same conditions, the silencer assembly according to the embodiment of the present disclosure can achieve a noise reduction effect of 3 to 4dB (A), which is a noise reduction that can be clearly perceived by people. Moreover, the silencer assembly according to the embodiment of the present disclosure also improves the noise quality, making the noise sound relatively soft. At the same time, the aerodynamic performance is not significantly reduced or only slightly reduced.

[0068] In the process of realizing the utility model claimed for protection, those skilled in the art can understand and realize variations of the disclosed embodiments by studying the drawings, the disclosure and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. Features described in different dependent claims or embodiments may be combined as long as it is technically feasible.

[0069] The foregoing description has been described with reference to specific embodiments. However, the above illustrative discussion is not intended to be exhaustive or to limit the disclosure to the precise forms described. In view of the above teachings, many modifications and variations are possible. Thus, other persons skilled in the art can best utilize the technology and various embodiments with various modifications suitable for various purposes.

[0070] Although 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 should be understood to be included within the scope of the present disclosure.

Claims

1. A muffler assembly (300), characterized in that: The muffler assembly (300) comprises: A first housing (110); A first muffler (100), the first muffler (100) being configured to be arranged inside the first shell (110) and assembled to the first shell (110), wherein a first gap (G1) is formed between an outer wall of the first muffler (100) and an inner wall of the first shell (110), the inner wall of the first muffler (100) defining a first airflow path (P1), and an airflow in the first airflow path (P1) flowing along a first direction (F1), The first sound-absorbing member (100) comprises: at least one first airflow outlet (101), the airflow in the first airflow path (P1) is discharged only through the first airflow outlet (101), and At least two blades (102), the at least two blades (102) are arranged in a circumferential direction, and a gas channel (103) is formed between two adjacent blades of the at least two blades (102), so 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) to the first airflow path (P1).

2. The sound-absorbing 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 in a range of 0 to 45 degrees.

3. The sound-absorbing assembly (300) according to claim 1, characterized in that: The first silencer (100) further comprises two blocking portions (104) respectively located on both sides of the first airflow outlet (101); the blocking portions (104) protrude outward from the first silencer (100) to abut against the inner wall of the first shell (110) to prevent the airflow entering the first gap (G1) from passing through the blocking portions in a circumferential direction.

4. The sound-absorbing assembly (300) according to claim 1, characterized in that: The width of the first gap (G1) in the radial direction is in the range of 0.2 mm to 5 mm.

5. The sound-absorbing assembly (300) according to claim 1, characterized in that: The gas passage (103) is tapered from the inside toward the outside in the radial direction.

6. The sound-absorbing assembly (300) according to claim 1, characterized in that: The cross section of any blade (102) of the at least two blades is in the shape of a water drop.

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

8. The sound-absorbing assembly (300) according to any one of claims 1 to 7, characterized in that: Also includes: a second silencer (200) located outside the first shell (110), wherein a second airflow path (P2) is formed between the first shell (110) and the second silencer (200), and the airflow discharged from the first airflow path (P1) via the first airflow outlet (101) can enter the second airflow path (P2), wherein the second silencer (200) comprises at least one second airflow outlet (201) to allow the airflow in the second airflow path (P2) to be discharged; as well as A second shell (210), the second shell is located outside the second sound-absorbing member (200) and is tightly matched with the second sound-absorbing member (200).

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

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

11. The sound-absorbing assembly (300) according to claim 8, characterized in that: The second air flow outlet (201) and the first air flow outlet (101) are arranged to be opposite to each other in a radial direction.

12. The sound-absorbing assembly (300) according to claim 8, characterized in that: A second gap (G2) is formed between the inner wall of the second silencer (200) and the outer wall of the first shell (110), and the width of the second gap in the radial direction does not exceed 5 mm.

13. The sound-absorbing assembly (300) according to claim 8, characterized in that: The second sound-absorbing member (200) comprises a plurality of second holes, wherein the second holes are through holes, so as to form a plurality of dense cavity structures with the second shell (210) to increase refraction and / or reflection of sound waves.

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

15. A cleaning device (1), characterized in that include: A cleaning assembly, a power device, and a silencer system (10) according to claim 14, wherein the silencer system (10) is used to reduce the noise of the power device.

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