Cleaning device and cleaning system

Abstract

Provided are a cleaning device and a cleaning system, relating to the technical field of electric devices. A cleaning device (10) comprises: a fan assembly (100), wherein the fan assembly (100) provides a suction force for the cleaning device, and the fan assembly (100) is provided with a second air outlet; an air duct (410); and a first air outlet (430) and a first air inlet (420) communicated with the air duct (410), wherein the first air inlet (420) is communicated with the second air outlet (114) of the fan assembly (100), and a silencer (500) is provided in the air duct (410) so as to reduce noise. The silencer (500) is provided in the air duct (410), such that the noise can be reduced as the noise passes through the silencer (500) along with airflow, and the noise diffused to the outside can be reduced, thereby achieving a noise reduction effect.

Description

Cleaning device and cleaning system Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application No. 202420813207X, filed on April 18, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to an electrical appliance, and in particular, to a cleaning device and a cleaning system. BACKGROUND

[0003] Fan assemblies are widely used in electrical appliances, especially in cleaning devices. The fan assemblies are mainly used to make air flow quickly in the electrical appliances, form a negative pressure in the cleaning device, and use the negative pressure to suck external impurities into the cleaning device, thereby achieving the purpose of cleaning. In the related art, the fan assembly generates a large noise during operation. SUMMARY

[0004] The present disclosure aims to at least be able to solve the technical problem of a large noise to some extent. To this end, the present disclosure provides a cleaning device and a cleaning system.

[0005] In a first aspect, the present disclosure provides a cleaning device, comprising: a fan assembly, the fan assembly providing suction force for the cleaning device, the fan assembly having a second air outlet; an air duct; a first air outlet and a first air inlet in communication with the air duct, the first air inlet being in communication with the second air outlet of the fan assembly; wherein a sound absorber is arranged in the air duct to reduce noise.

[0006] In the present disclosure, the fan assembly can provide suction force for the cleaning device during cleaning, and can absorb impurities, thereby achieving the purpose of cleaning. However, the fan assembly generates a large noise during operation, and the noise is also diffused to the outside with the airflow. If the noise is too large, it will affect the user experience. The air duct can increase the flow path of the noise of the fan assembly in the entire cleaning device, and can achieve a certain noise reduction effect. The sound absorber is arranged in the air duct, which can further eliminate the noise during the flow of the sound absorber, reduce the noise diffused to the outside, and further achieve the effect of noise reduction.

[0007] In a second aspect, the cleaning device provided by the embodiments of the present disclosure includes: a fan assembly having a second air outlet; an air duct; a first air outlet and a first air inlet in communication with the air duct, the first air inlet being in communication with the second air outlet of the fan assembly; wherein the air duct has a first air section and a second air section, the first air section being connected with the first air inlet, and the second air section being connected with the first air outlet, and the width of the first air section is smaller than the width of the second air section.

[0008] The cleaning device provided by the second aspect has the same advantages as the cleaning device provided by the first aspect, which will not be repeated here.

[0009] In a third aspect, the cleaning system provided by the embodiments of the present disclosure includes a base station and the cleaning device provided by the first aspect.

[0010] The cleaning system provided by the third aspect has the same advantages as the cleaning device provided by the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0011] The above and various other advantages and benefits of the present disclosure will become apparent to those ordinarily skilled in the art upon reading the following detailed description of the preferred embodiments in conjunction with the accompanying drawings.

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present disclosure, and other drawings can be obtained by those of ordinary skill in the art without any creative effort based on these drawings.

[0013] FIG. 1 shows a structural schematic diagram of the cleaning device provided by the embodiments of the present disclosure.

[0014] FIG. 2 shows a cross-sectional view of the cleaning device provided by the embodiments of the present disclosure.

[0015] FIG. 3 shows a structural schematic diagram of the sound attenuation cavity of the cleaning device provided by the embodiments of the present disclosure being arranged on the water tank.

[0016] FIG. 4 shows an axonometric view of FIG. 3.

[0017] FIG. 5 shows a structural schematic diagram of the sound attenuation cavity of the cleaning device provided by the embodiments of the present disclosure having multiple communication openings.

[0018] FIG. 6 shows an axonometric view of FIG. 5.

[0019] FIG. 7 shows a structural schematic diagram of the sound attenuation cavity of the cleaning device provided by the embodiments of the present disclosure being multiple.

[0020] Fig. 8 shows the axonometric view of Fig. 7.

[0021] Fig. 9 shows a schematic view of a structure of the sound attenuation cavity of the cleaning device according to an embodiment of the present disclosure.

[0022] Fig. 10 shows the axonometric view of Fig. 9.

[0023] Fig. 11 shows a schematic view of a structure of the fan assembly according to an embodiment of the present disclosure.

[0024] Fig. 12 shows a sectional view of the fan assembly according to an embodiment of the present disclosure.

[0025] Fig. 13 shows a comparison of noise at the second air outlet after a sound attenuation cavity is arranged in the accommodating cavity.

[0026] Fig. 14 shows a schematic view of a structure of the fan assembly according to another embodiment of the present disclosure.

[0027] Fig. 15 shows a sectional view of the fan assembly according to an embodiment of the present disclosure.

[0028] Reference signs: 10 - cleaning device, 100 - fan assembly, 110 - housing, 112 - accommodating cavity, 113 - second air inlet, 114 - second air outlet, 115 - sound attenuation cavity, 115a - bottom wall, 115b - opening, 120 - fan wheel, 200 - main body, 300 - water tank, 410 - air duct, 412 - first air section, 413 - second air section, 420 - first air inlet, 430 - first air outlet, 500 - sound attenuator, 510 - blocking rib, 520 - sound attenuation cavity, 530 - communication opening. DETAILED DESCRIPTION

[0029] The present application will be further described below in conjunction with the accompanying drawings and specific embodiments. The following description is merely illustrative of the basic principles of the present application and is not intended to limit the same.

[0030] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present disclosure.

[0031] It should be noted that all directional indications in the embodiments of the present disclosure are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0032] In the present disclosure, unless specifically defined and limited otherwise, the terms "connected", "fixed", and the like should be interpreted broadly, for example, "fixed" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal connection of two elements, or interaction relationship between two elements, unless specifically limited otherwise. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0033] In addition, in the present disclosure, the description such as "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features, or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present disclosure.

[0034] The fan assembly is widely used in electrical appliances, especially in cleaning equipment. The fan assembly is mainly used to make air flow quickly in the electrical appliance, form a negative pressure in the cleaning equipment, and use the negative pressure to suck the external impurities into the cleaning equipment, so as to achieve the purpose of cleaning. In the related art, the fan assembly has the problem of relatively large noise in the working process due to the excessively fast wind speed or the abnormal sound of the fan wheel. The fan assembly and the cleaning equipment provided by the embodiments of the present disclosure can improve the above problems to a certain extent, and the cleaning equipment provided by the embodiments of the present disclosure can reduce the noise of the fan assembly in the working process and reduce the influence of noise on users.

[0035] The present disclosure will be described below in conjunction with the accompanying drawings and specific embodiments:

[0036] Please refer to FIG. 1 and FIG. 2, the present disclosure provides a cleaning equipment 10, the cleaning equipment 10 provided by the embodiments of the present disclosure can reduce the noise in the working process and improve the user experience.

[0037] In the embodiments of the present disclosure, the cleaning equipment 10 includes a main body 200, a fan assembly 100 installed on the main body 200, and a water tank 300 installed on the main body 200 and forming an air duct 410 with the main body 200, the air duct 410 communicates with the fan assembly 100; the air duct 410 is provided with a sound attenuation cavity 520 to reduce noise.

[0038] The main body 200 is the main structure of the entire cleaning device 10, and provides a mounting base for the fan assembly 100, the water tank 300 and the like. The fan assembly 100, the water tank 300 and the like can be mounted on the main body 200, so that the entire cleaning device 10 can form an integral whole, and the use of the entire cleaning device 10 can be facilitated.

[0039] The water tank 300 can be a sewage tank or a clean water tank, i.e., the sewage tank and the main body 200 form the air duct 410, or the clean water tank and the main body 200 form the air duct 410, or both the sewage tank and the clean water tank form the air duct 410 with the main body 200.

[0040] If both the sewage tank and the clean water tank form the air duct 410 with the main body 200, the sewage tank and the clean water tank can be arranged side by side, i.e., the sewage tank and the clean water tank are arranged along the circumferential direction of the main body, and the air duct 410 can be arranged as a bent channel. Alternatively, the sewage tank and the clean water tank can be arranged one above the other, i.e., the clean water tank and the sewage tank are arranged along the axial direction of the main body, and the sewage tank can be arranged above or below the clean water tank. The air duct 410 can be arranged as a long strip or a bent channel, and can not be limited.

[0041] In the disclosed embodiments, during the operation of the cleaning device 10, the fan assembly 100 can form a negative pressure inside the main body 200, so as to provide a suction force for the cleaning device 10 during cleaning, so that external impurities can be sucked into the main body 200 under the negative pressure, thereby achieving the purpose of cleaning. During the operation of the fan assembly 100, a large noise can be generated, and the noise can be diffused to the outside along with the airflow. If the noise is too large, the user experience can be affected. The air duct 410 formed between the water tank 300 and the main body 200 can increase the flow path of the noise of the fan assembly 100 in the entire cleaning device 10, and can achieve a certain noise reduction effect. The sound absorber 500 arranged in the air duct 410 can further absorb the noise during the flow of the gas, so as to reduce the noise diffused to the outside and improve the noise reduction effect.

[0042] Since the air duct 410 is formed by the gap between the main body 200 and the water tank 300, the sound absorber 500 arranged in the air duct 410 can utilize the narrow space between the main body 200 and the water tank 300 for sound absorption, and can not occupy other space, so as to achieve sound absorption without increasing the volume of the cleaning device 10 as much as possible.

[0043] Please refer to FIG. 3 and FIG. 4. In some embodiments, the water tank 300 is provided with a blocking rib 510, the blocking rib 510 is in contact with the main body 200, and the blocking rib 510, the main body 200 and the water tank 300 form the air duct 410 and the sound absorber 500.

[0044] The blocking rib 510 is in contact with the main body 200, so that the water tank 300 and the main body 200 have a certain distance, that is, the water tank 300 and the main body 200 have a gap, which is configured as an air duct 410. By using the gap between the water tank 300 and the main body 200 to form the air duct 410 and the silencer 500, the inherent structural design of the cleaning equipment 10 can be used without adding other structures, so that the noise can be reduced while reducing the volume.

[0045] That is, the blocking rib 510 is arranged between the water tank 300 and the main body 200, so that the gap between the water tank 300 and the main body 200 can be arranged as the air duct 410, that is, the shape of the blocking rib 510 is the shape of the air duct 410. The air duct 410 can be a long strip-shaped air duct 410, or can be an air duct 410 formed by connecting multiple bent sub-segments. The specific shape of the air duct 410 is not limited in the present disclosure.

[0046] The volume of the water tank 300 is much smaller than the volume of the entire main body 200. By arranging the blocking rib 510 on the water tank 300, the water tank 300 can be installed at the corresponding installation position during installation, so that the blocking rib 510 is in contact with the main body 200, and the internal cavity surrounded by the water tank 300, the main body 200 and the blocking rib 510 forms the air duct 410. At the same time, the blocking rib 510 can also directly form the silencer 500, without the need to arrange additional structures, thereby reducing costs.

[0047] In some embodiments, the blocking rib 510 and the water tank 300 can be integrally formed. Since the volume of the entire cleaning equipment 10 is limited, the gap between the water tank 300 and the main body 200 is small. By integrally forming the blocking rib 510 on the water tank 300, the assembly process between the blocking rib 510 and the water tank 300 is reduced, and the sealing process between the blocking rib 510 and the water tank 300 is also reduced, thereby reducing costs.

[0048] Of course, in addition to this, the blocking rib 510 can also be arranged on the main body 200, that is, the blocking rib 510 is arranged at the corresponding installation position of the water tank 300. When the water tank 300 is installed on the main body 200, it can be in contact with the water tank 300, and the blocking rib 510, the water tank 300 and the main body 200 can form a closed air duct 410.

[0049] As for the type of silencer 500, it can be designed as an expansion-type silencer, an inserted pipe-type silencer, a perforated silencer, a resonance silencer, a quarter-wave tube, or a combination of single silencers. In the present disclosure, it can not be limited, and several of them will be introduced in detail below.

[0050] The muffler 500 can include a muffling cavity 520, that is, the muffler 500 can be provided with the muffling cavity 520, the muffling cavity 520 is in communication with the air duct 410, and the depth direction of the muffling cavity 520 is arranged at an angle with the air outlet direction of the air duct 410, that is, the depth direction of the muffling cavity 520 is different from the air outlet direction of the air duct 410. In the process of noise flowing with the airflow, when the noise flows to the muffling cavity 520, it will enter the muffling cavity 520, and resonance will be generated in the muffling cavity 520 to achieve the purpose of noise reduction, or the noise is reflected after moving to the bottom wall of the muffling cavity 520, and finally returns to the air duct 410, and is superimposed with the noise in the air duct 410, thereby achieving the purpose of noise reduction, or the energy of the noise is weakened by the perforations in the process of entering the muffling cavity 520 to achieve the purpose of noise reduction.

[0051] The depth direction of the muffling cavity 520 is arranged at an angle with the air outlet direction of the air duct 410, and the angle range is (0°, 180°), and specifically can be 30°, 45°, 90°, 135°, 150°, etc.

[0052] In some embodiments, the muffling cavity 520 is in communication with the air duct 410 through the communication port 530, and the length of the communication port 530 is less than the length of the muffling cavity 520 in the air outlet direction of the air duct 410.

[0053] The air duct 410 has a first air inlet 420 and a first air outlet 430, the first air inlet 420 is in communication with the second air outlet 114 of the fan assembly 100, the air outlet direction of the air duct 410 refers to the direction from the first air inlet 420 to the first air outlet 430, the airflow flows from the first air inlet 420 to the first air outlet 430 under the action of the fan assembly 100, and the air outlet direction of the air duct 410 is the direction from the first air inlet 420 to the first air outlet 430. In the air outlet direction of the air duct 410, the length of the communication port 530 is less than the length of the muffling cavity 520, and the length of the muffling cavity 520 can be much greater than the length of the communication port 530. That is, the communication port 530 is a small hole, and the entire muffling cavity 520 can be considered as a substantially closed cavity.

[0054] When the noise enters the muffling cavity 520 through the communication port 530, the air in the muffling cavity 520 is excited by the sound wave and vibrates back and forth like a piston, converting sound energy into heat energy and dissipating it, thereby achieving the purpose of noise reduction.

[0055] Since the length of the sound attenuation cavity 520 in the air outlet direction of the air duct 410 is relatively long, the vibration space of the air in the sound attenuation cavity 520 is relatively large, and thus the sound energy can be converted into heat energy as much as possible and dissipated, thereby improving the sound attenuation effect. That is, the basic principle of resonance is that after the sound wave enters the sound attenuation cavity 520, it will be reflected multiple times in the sound attenuation cavity 520, and the sound attenuation purpose can be achieved through wave superposition and interference. When the sound wave is reflected by the inner wall of the sound attenuation cavity 520 and has a 180-degree phase difference with the sound wave that is not reflected by the inner wall of the sound attenuation cavity 520, the sound attenuation effect is best after superposition. Therefore, the depth of the sound attenuation cavity 520 can be set according to the frequency of the noise.

[0056] During the operation of the fan assembly 100, the structure of the fan assembly 100 is determined, and the working scene is basically determined, so that the frequency of the noise generated by the fan assembly 100 is basically determined. Therefore, the depth of the sound attenuation cavity 520 can be set according to the frequency of the noise.

[0057] In this case, it can be considered that the sound attenuation is performed by resonance, and it can be considered that this structure realizes the principle of the resonance sound attenuator.

[0058] In some embodiments, the length of the sound attenuation cavity 520 in the air outlet direction of the air duct 410 is the same as the length of the communication port 530 in the air outlet direction of the air duct 410, that is, after the noise enters the sound attenuation cavity 520, it flows to the bottom wall of the sound attenuation cavity 520, is reflected by the bottom wall of the sound attenuation cavity 520, and then enters the air duct 410. The noise in the air duct 410 is superimposed and interfered, thereby achieving the purpose of sound attenuation. In this case, the sound attenuation cavity 520 uses the principle of a quarter-wave tube to attenuate sound.

[0059] Referring to FIGS. 5 and 6, in some embodiments, the communication port 530 has a plurality of communication ports 530, and the plurality of communication ports 530 are sequentially arranged along the air outlet direction of the air duct 410.

[0060] The plurality of communication ports 530 are sequentially and spaced apart along the air outlet direction of the air duct 410. The spacing distance between adjacent two communication ports 530 can be the same or different, and the specific spacing distance can be set according to the length of the sound attenuation cavity 520 in the air outlet direction of the air duct 410. The number of communication ports 530 is not specifically limited.

[0061] The plurality of communication ports 530 are sequentially arranged along the air outlet direction of the air duct 410. In the process of the noise flowing to the first air outlet 430 along the airflow, the noise can enter the sound attenuation cavity 520 from different communication ports 530, so that the noise can basically enter the sound attenuation cavity 520 for sound attenuation, thereby improving the sound attenuation effect of the sound attenuation cavity 520.

[0062] When the noise enters the sound attenuation cavity 520 through the communication port 530, the gas will rub against the inner wall of the communication port 530 due to the difference in impedance between the communication port 530 and the air duct 410, so that the gas will vibrate, that is, the noise will vibrate during contact with the communication port 530, thereby converting sound energy into heat, thereby achieving the purpose of damping and noise reduction.

[0063] Please refer to FIG. 7 and FIG. 8, in some embodiments, the sound attenuation cavities 520 are multiple, and the multiple sound attenuation cavities 520 are sequentially and spacedly arranged along the air outlet direction of the air duct 410.

[0064] Among them, the extension direction of the multiple sound attenuation cavities 520 can be the same or different, and can be set according to the position between the water tank 300 and the main body 200. The interval distance of the adjacent two sound attenuation cavities 520 can be the same or different, and can be set according to the position between the water tank 300 and the main body 200.

[0065] Similarly, the shapes of the multiple sound attenuation cavities 520 can be the same or different, that is, the shapes of the multiple sound attenuation cavities 520 can all be the same, or the shapes of the multiple sound attenuation cavities 520 can all be different, or part of the sound attenuation cavities 520 can have the same shape and part of the sound attenuation cavities 520 can have different shapes.

[0066] In addition, the lengths of the multiple sound attenuation cavities 520 can be the same or different, that is, the lengths of the multiple sound attenuation cavities 520 can be the same, or the lengths of the multiple sound attenuation cavities 520 can be different, or part of the sound attenuation cavities 520 can have the same length and part of the sound attenuation cavities 520 can have different lengths.

[0067] In some embodiments, the depths of any two sound attenuation cavities 520 are the same or different.

[0068] The depths of any two sound attenuation cavities 520 can be the same or different, that is, the depths of the multiple sound attenuation cavities 520 can be the same, or the depths of the multiple sound attenuation cavities 520 can all be different, or part of the sound attenuation cavities 520 can have the same depth and part of the sound attenuation cavities 520 can have different depths. That is, the multiple sound attenuation cavities 520 can have different depths.

[0069] During the working process of the fan assembly 100, the frequency of the noise of the fan assembly 100 is not a point value but a frequency band, and the multiple sound attenuation cavities 520 are arranged to have different depths to correspond to multiple frequencies in the noise, so as to correspond to multiple frequencies of the noise to be weakened, thereby improving the noise reduction effect.

[0070] In some embodiments, the depth of the sound attenuation cavity 520 is set according to the following formula:

[0071] f = (c / l 1)(2n+1) / 4;

[0072] wherein f is the frequency of the noise, c is the speed of sound of the noise, l1 is the depth of the sound cavity 520, and n is zero or a positive integer.

[0073] According to the above formula, f = (c / l1)(2n+1) / 4 can be obtained; wherein the speed of sound of the noise divided by the frequency of the noise is equal to the wavelength of the noise, and n is 0 or a positive integer, that is, the length of the sound cavity 520 is equal to an odd multiple of a quarter of the wavelength of the noise, so that the depth of the sound cavity 520 is considered to be related to a quarter of the wavelength of the noise, and the sound cavity 520 is considered to be a quarter of the wavelength tube. When the noise in the containing cavity 112 enters the sound cavity 520, the noise is reflected in the sound cavity 520 and then propagates to the connection between the sound cavity 520 and the air duct 410 again, and the running length of the noise is exactly half a wavelength, which has a phase difference of 180 degrees with the noise in the air duct 410, can interfere with each other, so that the volume of the noise can be attenuated, thereby reducing the volume of the noise and improving the user experience.

[0074] That is, in some embodiments, the depth of the sound cavity 520 is set to an odd multiple of a quarter of the wavelength of the noise, so that the noise reflected by the sound cavity 520 has a phase difference of 180 degrees with the noise in the air duct 410, and the two can interfere with each other after superposition, thereby achieving the purpose of sound attenuation.

[0075] In some embodiments, the sound cavity 520 is arranged on both sides of the air duct 410. Arranging the sound cavity 520 on both sides can improve the efficiency.

[0076] Please refer to FIG. 9 and FIG. 10, in some embodiments, the projection of the first air outlet 430 on the air outlet direction of the air duct 410 is located in the projection of the air duct 410 along the air outlet direction of the air duct 410. It is explained that the opening 115b of the first air outlet 430 has a small area, when the noise flows with the airflow to the first air outlet 430, due to the different impedance at the first air outlet 430 and the impedance in the air duct 410, part of the noise will be reflected in the opposite direction of the air outlet direction under the action of the inner wall, and then superimposed and interfered with the noise in the air duct 410, thereby achieving the effect of noise reduction.

[0077] The first air outlet 430 can have multiple, which can not only reduce the noise but also improve the air volume of the air duct 410 to a certain extent, thereby improving the negative pressure of the cleaning equipment 10, improving the adsorption force of impurities, and improving the cleaning effect.

[0078] In some embodiments, the first air outlet 430 can be two, and the two first air outlets 430 are located on the same side of the air duct 410. The air outlet direction of the entire air duct 410 can be consistent, and the negative pressure of the cleaning equipment 10 can be improved to a certain extent, the adsorption force of impurities can be improved, and the cleaning effect can be improved.

[0079] In some embodiments, the two first air outlets 430 are respectively located on both sides of the central axis of the air duct 410, so that the two first air outlets 430 can be arranged at different positions in the air duct 410, which can also have a certain noise reduction effect while discharging air.

[0080] In some embodiments, the air duct 410 has a first air section 412 and a second air section 413, and the width of the first air section 412 is smaller than the width of the second air section 413.

[0081] In some embodiments, the width of the first air section 412 and the second air section 413 refers to the width in the direction perpendicular to the air outlet direction, the first air section 412 is connected with the first air inlet 420, and the second air section 413 is connected with the first air outlet 430. When the noise enters the second air section 413 from the first air section 412, the noise can be diffused in the second air section 413 due to the increase in width, so that the noise can be diffused in different directions. After reflection on the inner wall of the air duct 410, the noise can be superimposed and interfered, and also has a certain noise reduction effect.

[0082] In some embodiments, part of the first air section 412 is located outside the second air section 413, and part of the first air section 412 is located inside the second air section 413. Since the first air section 412 is connected with the first air inlet 420, and the second air section 413 is connected with the first air outlet 430, the air direction of the air duct 410 is the first air inlet 420, the first air section 412, the second air section 413, and the first air outlet 430. The part of the first air section 412 arranged in the second air section 413 can guide the air from the first air section 412 to the second air section 413, so that the air can smoothly enter the second air section 413, reducing the noise generated by the air flow due to turbulence and other reasons, and also improving the noise reduction effect to a certain extent.

[0083] In the direction from the first air inlet 420 to the first air outlet 430 (the air outlet direction of the air duct 410), the width of the air duct 410 gradually decreases and then increases, so that when the noise enters the wider part from the narrower part, the noise can be diffused in the air duct 410, so that the noise can be diffused in different directions. After reflection on the inner wall of the air duct 410, the noise can be superimposed and interfered, and also has a certain noise reduction effect.

[0084]

[0085] In some embodiments, the silencer 500 can also be directly arranged at the first air outlet 430 or the first air inlet 420. In addition to arranging the silencing cavity 520 in the air duct 410 by the baffle 510, the silencer 500 can also be directly arranged at the first air outlet 430 or the first air inlet 420, and the silencing purpose can also be achieved by arranging the external silencer 500.

[0086] Of course, in addition to this, the external silencer 500 can also be arranged inside the air duct 410.

[0087] Referring to FIGS. 11 and 12, in the embodiments of the present disclosure, the fan assembly 100 includes a housing 110 and a fan wheel 120, the housing 110 has a containing cavity 112, a second air inlet 113 and a second air outlet 114 which communicate with the containing cavity 112; the fan wheel 120 is arranged in the containing cavity 112; a noise reduction cavity 115 which communicates with the containing cavity 112 is arranged in the housing 110, the noise reduction cavity 115 is located between the fan wheel 120 and the second air outlet 114, and the depth direction of the noise reduction cavity 115 is arranged at an angle with the air outlet direction of the second air outlet 114, so as to reduce the noise of the second air outlet 114.

[0088] The housing 110 is the main body of the entire fan assembly 100, and provides a mounting basis for the fan wheel 120 and other structures of the fan assembly 100. The fan wheel 120 and other components can be mounted in the containing cavity 112, which can play a certain protective role for the fan wheel 120 and other structures of the fan assembly 100, and reduce damage to the fan wheel 120 and other structures caused by external dust, particles and other impurities.

[0089] The second air inlet 113 includes a plurality of second air inlets 113 arranged in the housing 110 in a ring shape. The second air inlet 113 is arranged in multiple, and the total area of the plurality of second air inlets 113 is the air inlet area of the entire fan assembly 100. In the case of the same air inlet area, compared with arranging one large air inlet, arranging multiple smaller air inlets 113 can pre-divide the gas into multiple streams, which can reduce the noise generated by the gas gathering, and thus reduce the volume of the noise.

[0090] In some embodiments, the distance between the noise reduction cavity 115 and the second air outlet 114 is less than the distance between the noise reduction cavity 115 and the second air inlet 113. Since the gas flows from the second air inlet 113 to the second air outlet 114, arranging the noise reduction cavity 115 close to the second air outlet 114 can eliminate the noise in the gas flowing out of the second air outlet 114 as much as possible, and reduce the spread of the noise 114 from the second air outlet 114 to the outside.

[0091] In some embodiments, the outer end surface of the second air outlet 114 is not parallel to the outer end surface of the second air inlet 113, so that the air duct between the second air inlet 113 and the second air outlet 114 has an angle, which can increase the flow path of the gas in the housing 110 and also reduce the noise to some extent.

[0092] The second air inlet 113 and the second air outlet 114 are both in communication with the containing cavity 112. During the operation of the fan wheel 120, the external gas enters the containing cavity 112 from the second air inlet 113 and is discharged from the second air outlet 114, so that the area between the second air inlet 113 and the second air outlet 114 forms an air duct for the gas flow. Since the fan wheel 120 generates noise during operation, the noise will also spread to the outside from the second air outlet 114, resulting in a large noise of the cleaning device during operation and affecting the user experience.

[0093] In the embodiments of the present disclosure, a noise reduction cavity 115 is arranged between the fan wheel 120 and the second air outlet 114, and the depth direction of the noise reduction cavity 115 is arranged at an angle with the air outlet direction of the second air outlet 114, that is, the depth direction of the noise reduction cavity 115 is arranged at an angle with the direction of the air duct in the containing cavity 112. When the noise propagates to the containing cavity 112, it will diffuse to the inside of the containing cavity 112 and move to the bottom wall 115a of the noise reduction cavity 115 after reflection, and finally return to the air duct, and superimpose with the noise in the air duct, thereby achieving the purpose of noise reduction and reducing the noise volume from the second air outlet 114 to some extent.

[0094] It should be noted that the noise reduction cavity 115 can play a certain role in noise reduction. The depth of the noise reduction cavity 115 is related to the wavelength of the noise. When the phase of the reflected noise from the noise reduction cavity 115 and the phase of the noise in the noise reduction cavity 115 in the air duct are in opposite two half waves, the noise volume at the second air outlet 114 can be weakened to some extent after the reflected noise and the noise in the air duct are superimposed.

[0095] The angle between the depth direction of the noise reduction cavity 115 and the air outlet direction of the second air outlet 114 ranges from 0° to 180°, and can be 30°, 45°, 90°, 135°, 150°, etc.

[0096] The bottom wall 115a of the noise reduction cavity 115 refers to the wall opposite to the opening 115b of the noise reduction cavity 115, and is not the lowest wall of the noise reduction cavity 115 in the working state of the fan assembly 100. The depth of the noise reduction cavity 115 refers to the distance from the opening 115b of the noise reduction cavity 115 to the bottom wall 115a of the noise reduction cavity 115.

[0097] Since the model of the fan wheel 120 is determined when the fan assembly 100 is shipped, the size of the shell 110 is determined, the installation position of the fan wheel 120 in the shell 110 is determined, the model of other components of the fan assembly 100 and the installation position on the shell 110 are determined, and the frequency of the noise of the fan assembly 100 during operation is also determined, the depth of the noise reduction cavity 115 can be set according to the frequency of the noise, so that the volume of the noise flowing out of the second air outlet 114 can be reduced.

[0098] In some embodiments, the depth of the noise reduction cavity 115 is set according to the following formula:

[0099] f = (c / l 2)(2n+1) / 4;

[0100] wherein f is the frequency of the noise, c is the speed of the noise, l2 is the depth of the noise reduction cavity 115, and n is zero or a positive integer.

[0101] According to the above formula, l2 = (c / f)(2n+1) / 4 can be obtained, wherein the speed of the noise divided by the frequency of the noise is equal to the wavelength of the noise, and n is 0 or a positive integer, that is, the length of the noise reduction cavity 115 is equal to an odd multiple of one-quarter of the wavelength of the noise, so that the depth of the noise reduction cavity 115 is considered to be related to one-quarter of the wavelength of the noise, and the noise reduction cavity 115 is considered to be a quarter-wave tube. When the noise in the containing cavity 112 enters the noise reduction cavity 115, the noise is reflected in the noise reduction cavity 115 and then propagates to the connection between the noise reduction cavity 115 and the containing cavity 112 again. The noise travels from the containing cavity 112 to the noise reduction cavity 115 and then reflects back to the containing cavity 112 from the noise reduction cavity 115, and the distance is exactly half a wavelength. The noise reflected from the noise reduction cavity 115 to the containing cavity 112 has a phase difference of 180 degrees with the noise in the containing cavity 112 without reflection, and can interfere with each other, so that the volume of the noise can be attenuated, thereby reducing the volume of the noise and improving the user experience.

[0102] That is, in some embodiments, the depth of the noise reduction cavity 115 is set to an odd multiple of one-quarter of the wavelength of the noise, so that the noise reflected by the noise reduction cavity 115 has a phase difference of 180 degrees with the noise in the containing cavity 112 without being reflected by the noise reduction cavity 115, and the two superimposed can interfere with each other, thereby achieving the purpose of noise reduction.

[0103] As shown in FIG. 13, wherein the abscissa represents the frequency of the noise, and the ordinate represents the volume of the noise. As shown in FIG. 13, the frequency of the noise is not a point value, but a frequency band, and the depth of the noise reduction cavity 115 corresponds to the frequency at point A in the figure. In FIG. 13, the original state refers to the volume of the corresponding noise generated by the fan assembly 100 when the fan assembly 100 is working without the noise reduction cavity 115, and the noise reduction cavity 115 is added refers to the volume of the noise generated by the fan assembly 100 when the fan assembly 100 is working after the noise reduction cavity 115 is arranged in the shell 110, as shown by point B. Compared with point A, the noise is reduced. As shown in FIG. 13, after the noise reduction cavity 115 is arranged, the volume of the corresponding frequency can be adaptively reduced, and the user experience can be improved.

[0104] It should be noted that, during the working process of the fan assembly 100, the frequency of the noise is not a point value, but a frequency band, and there may be several specific frequency noise frequencies that are particularly high or have a particularly large volume in the noise frequency band. When setting the depth of the noise reduction cavity 115, the wavelength of the specific frequency noise can be used for setting, so as to eliminate the noise of the specific several frequencies. In addition, the noise reduction cavity 115 can also be arranged as a variable noise reduction cavity 115, so that the depth of the noise reduction cavity 115 can correspond to all the noise frequencies in the frequency band, so as to weaken the noise generated by the fan assembly 100 during operation, and improve the user experience.

[0105] In some embodiments, the second air inlet 113 and the second air outlet 114 are arranged at two ends of the shell 110 respectively, and the noise reduction cavity 115 is arranged on the side wall of the shell 110. The depth of the noise reduction cavity 115 is perpendicular to the air outlet direction of the second air outlet 114.

[0106] The shell 110 is generally in a strip shape. The two ends of the shell 110 refer to the two end portions in the length direction of the shell 110, and the side wall of the shell 110 refers to all the walls except the two end portions. The second air inlet 113 and the second air outlet 114 are respectively located at the two ends of the shell 110. The air duct in the shell 110 is lengthened, the flow time of the gas in the shell 110 is increased, the gas can be better collected, the flow of the gas in the fan assembly 100 is improved, and the working effect of the fan assembly 100 is improved.

[0107] The noise reduction cavity 115 is arranged on the side wall of the shell 110 and extends away from the containing cavity 112. The movement direction of the noise in the noise reduction cavity 115 is arranged at an angle with the movement direction in the shell 110, that is, the movement direction of the noise in the shell 110 is different from the movement direction of the noise in the noise reduction cavity 115. The noise can overlap with the noise in the shell 110 after being reflected by the noise reduction cavity 115, so as to interfere with each other, so as to weaken the noise, and improve the user experience.

[0108] Specifically, the depth direction of the noise reduction cavity 115 is perpendicular to the air outlet direction of the second air outlet 114. When the noise moves from the shell 110 to the noise reduction cavity 115, the movement path in the noise reduction cavity 115 is the shortest, so that the noise can quickly return to the containing cavity 112, overlap with the noise in the shell 110, interfere with each other, and thus weaken the noise to improve the user experience.

[0109] In some embodiments, the noise reduction cavity 115 is multiple, and the multiple noise reduction cavities 115 are arranged at intervals.

[0110] The extension direction of the multiple noise reduction cavities 115 can be the same or different, which can be set according to the space in the containing cavity 112, the arrangement position of the fan wheel 120, the relative position between the second air outlet 114 and the fan wheel 120, and the like.

[0111] The interval distance between the adjacent two noise reduction cavities 115 can be the same or different, which can be set according to the arrangement structure of the entire fan assembly 100.

[0112] Similarly, the shapes of the multiple noise reduction cavities 115 can be the same or different, which can be that the shapes of the multiple noise reduction cavities 115 are all the same, or that the shapes of the multiple noise reduction cavities 115 are all different, or that the shapes of part of the noise reduction cavities 115 are the same and the shapes of part of the noise reduction cavities 115 are different.

[0113] In addition, as for the lengths of the multiple noise reduction cavities 115, similarly, the lengths of the multiple noise reduction cavities 115 can be the same or different, or the lengths of part of the noise reduction cavities 115 can be the same and the lengths of part of the noise reduction cavities 115 can be different.

[0114] In some embodiments, in the direction in which the second air inlet 113 faces the second air outlet 114, the depths of the noise reduction cavities 115 are the same.

[0115] The direction in which the second air inlet 113 faces the second air outlet 114 refers to the direction of the gas flow in the shell 110. In the gas flow direction, the depths of the noise reduction cavities 115 are the same, which means that the noise reduction cavities 115 can only weaken one frequency of noise. As for the depth of the noise reduction cavity 115 corresponding to which frequency of noise, it can be the noise with the largest frequency in the noise frequency band, or the frequency of the noise with the largest volume.

[0116] Herein, the depths of the noise reduction cavities 115 being the same can mean that the depths of all positions of one noise reduction cavity 115 are the same, or the depths of the multiple noise reduction cavities 115 are the same.

[0117] In some embodiments, in the direction in which the second air inlet 113 faces the second air outlet 114, the depths of the noise reduction cavities 115 decrease in turn.

[0118] The depth of the noise reduction cavity 115 decreases in turn in the direction from the second air inlet 113 to the second air outlet 114. As the depth of the noise reduction cavity 115 changes, the corresponding noise frequency also changes, so that the noise reduction cavity 115 can weaken the entire frequency band of the noise generated by the fan assembly 100 during operation, thereby weakening the noise in the entire frequency band and reducing the noise volume at the second air outlet 114, thereby improving the user experience.

[0119] The decreasing depth of the noise reduction cavity 115 can mean that the depth of the same noise reduction cavity gradually decreases in the direction from the second air inlet 113 to the second air outlet 114, or that the depths of the plurality of noise reduction cavities 115 decrease in turn in the direction from the second air inlet 113 to the second air outlet 114. For one of the noise reduction cavities 115, the depth of the single noise reduction cavity 115 can be the same at different positions, or the depth decreases in turn in the direction from the second air inlet 113 to the second air outlet 114.

[0120] In some other embodiments, the depths of at least two noise reduction cavities 115 are different in the direction from the second air inlet 113 to the second air outlet 114.

[0121] The depth of the noise reduction cavity 115 is related to the quarter wavelength of the noise. One depth of the noise reduction cavity 115 can weaken the noise of one frequency, and the depth of the noise reduction cavity 115 being different at least at two positions means that the noise of more than two frequencies can be weakened.

[0122] In the entire frequency band of the noise, there can be several noises with large volumes or high frequencies. When the depth of the noise reduction cavity 115 can be set to multiple different depths, the depth of the noise reduction cavity 115 can be set to an odd multiple of the quarter wavelength of the noise with the largest volume, or an odd multiple of the quarter wavelength of the noise with the highest frequency, or can be set according to actual needs.

[0123] In some embodiments, the noise reduction cavity 115 has an opening 115b in communication with the containing cavity 112, and the projection area of the noise reduction cavity 115 at the opening 115b in the depth direction of the noise reduction cavity 115 is less than or equal to the cross-sectional area of the containing cavity 112 at the opening 115b.

[0124] The projected area of the noise reduction cavity 115 at the opening 115b refers to the projected area of the noise reduction cavity 115 on the sidewall of the housing 110, and the cross-sectional area of the accommodating cavity 112 at the opening 115b refers to the cross-sectional area of the portion of the accommodating cavity 112 at the opening 115b in a plane perpendicular to the air outlet direction. The projected area of the noise reduction cavity 115 at the opening 115b being less than or equal to the cross-sectional area of the accommodating cavity 112 at the opening 115b means that the projected area of the noise reduction cavity 115 at the opening 115b is equal to or can infinitely approach the cross-sectional area of the accommodating cavity 112 at the opening 115b.

[0125] The volume of noise that can be attenuated by the noise reduction cavity 115 is related to the projected area of the noise reduction cavity 115 at the opening 115b and the cross-sectional area of the accommodating cavity 112 at the opening 115b. When the projected area of the noise reduction cavity 115 at the opening 115b is equal to the cross-sectional area of the accommodating cavity 112 at the opening 115b, the noise reduction cavity 115 can substantially eliminate noise of the corresponding frequency, and the closer the projected area of the noise reduction cavity 115 at the opening 115b to the cross-sectional area of the accommodating cavity 112 at the opening 115b, the better the noise reduction effect.

[0126] In some embodiments, the ratio of the projected area of the noise reduction cavity 115 at the opening 115b to the cross-sectional area of the accommodating cavity 112 at the opening 115b along the depth direction of the noise reduction cavity 115 is [0.8-1], and it can be considered that the projected area of the noise reduction cavity 115 at the opening 115b is equal to or can infinitely approach the cross-sectional area of the accommodating cavity 112 at the opening 115b, and at this time, the noise reduction cavity 115 has a better noise reduction effect.

[0127] The shape of the noise reduction cavity 115 can not be specifically limited, and can be a cuboid, a sphere, or an irregular shape, etc. Similarly, the length of the noise reduction cavity 115 can not be specifically limited, and can be set according to the space in the accommodating cavity 112, the distance and relative position between the second air outlet 114 and the fan wheel 120.

[0128] For example, in the case of a long strip-shaped noise reduction cavity 115, the length direction of the noise reduction cavity 115 can be arranged along the direction in which the fan wheel 120 approaches the second air outlet 114, or the width direction of the noise reduction cavity 115 can be arranged along the direction in which the fan wheel 120 approaches the second air outlet 114. In addition, the length direction of the noise reduction cavity 115 can be arranged at an angle to the direction in which the fan wheel 120 approaches the second air outlet 114.

[0129] In some embodiments, the depths of any two noise reduction cavities 115 are the same or different.

[0130] The depths of any two of the noise reduction cavities 115 are the same or different, the depths of the multiple noise reduction cavities 115 are the same, the depths of the noise reduction cavities 115 are all different, the depths of some of the noise reduction cavities 115 are the same, and the depths of some of the noise reduction cavities 115 are different. That is, the multiple noise reduction cavities 115 can be of different depths.

[0131] During operation of the fan assembly 100, the frequency of the noise of the fan assembly 100 is not a point value but a frequency band, and the multiple noise reduction cavities 115 are provided with different depths to correspond to multiple frequencies in the noise, so that multiple frequencies of the noise can be weakened, and the noise reduction effect is improved.

[0132] In the foregoing, in the depth direction of the noise reduction cavity 115, the projection area of the noise reduction cavity 115 at the opening 115b is less than or equal to the cross-sectional area of the containing cavity 112 at the opening 115b. When the multiple noise reduction cavities 115 are of the same depth, the sum of the projection areas of the multiple noise reduction cavities 115 at the opening 115b is less than or equal to the cross-sectional area of the containing cavity 112 at the opening 115b.

[0133] In some embodiments, in the direction of the second air inlet 113 toward the second air outlet 114, the multiple noise reduction cavities 115 are arranged in sequence and spaced apart (as shown in FIGS. 11 and 12) or arranged side by side (as shown in FIGS. 14 and 15).

[0134] Since the noise reduction cavities 115 are arranged between the fan wheel 120 and the second air outlet 114, in the direction of the second air inlet 113 toward the second air outlet 114, which is also substantially in the direction of the fan wheel 120 toward the second air outlet 114, arranging the multiple noise reduction cavities 115 in sequence and spaced apart means that the multiple noise reduction cavities 115 are arranged in sequence and overlap in the direction of the second air inlet 113 toward the second air outlet 114, and arranging the multiple noise reduction cavities 115 side by side means that the extension direction of the multiple noise reduction cavities 115 is the same as the direction of the second air inlet 113 toward the second air outlet 114.

[0135] For example, when the shape of the noise reduction cavity 115 is long strip-shaped, arranging the multiple noise reduction cavities 115 in sequence and spaced apart means that the width direction of the multiple noise reduction cavities 115 is along the direction of the second air inlet 113 toward the second air outlet 114, and the multiple noise reduction cavities 115 are arranged in overlap. Arranging the multiple noise reduction cavities 115 side by side means that the length direction of the noise reduction cavity 115 is along the direction of the second air inlet 113 toward the second air outlet 114.

[0136] The working principle of the fan assembly 100 provided by the embodiments of the present disclosure is as follows: in the embodiments of the present disclosure, during rotation of the fan wheel 120, noise flows along the direction of the gas to the second air outlet 114, and when the noise moves to the noise reduction cavity 115, the noise moves along the depth direction of the noise reduction cavity 115, and after being reflected by the bottom wall 115a of the noise reduction cavity 115, the noise has a 180-degree phase difference with the noise that has not been reflected by the noise reduction cavity 115 in the containing cavity 112, and the two can interfere with each other after superposition.

[0137] The present disclosure provides a cleaning device, comprising:

[0138] The fan assembly 100 provides suction force for the cleaning device, and the fan assembly 100 has the second air outlet 114;

[0139] The air duct 410;

[0140] The first air outlet 430 and the first air inlet 420 are in communication with the air duct 410, the air duct 410 exhausts air for the fan assembly 100, and the first air inlet 420 is in communication with the second air outlet 114 of the fan assembly 100;

[0141] The air duct 410 is provided with the silencer 500 to weaken the noise.

[0142] In some disclosed embodiments, the silencer 500 comprises a silencing cavity 520, and the depth direction of the silencing cavity 520 is arranged at an angle to the air outlet direction of the air duct 410.

[0143] In some disclosed embodiments, the silencing cavity 520 is in communication with the air duct 410 through the communication port 530, and in the air outlet direction of the air duct 410, the length of the communication port 530 is less than the length of the silencing cavity 520.

[0144] In some disclosed embodiments, the communication port 530 has a plurality of communication ports 530, and the plurality of communication ports 530 are sequentially arranged along the air outlet direction of the air duct 410.

[0145] In some disclosed embodiments, one silencing cavity has a plurality of communication ports.

[0146] In some disclosed embodiments, along the air outlet direction of the air duct 410, the length of the communication port 530 is the same as the length of the silencing cavity 520.

[0147] In some disclosed embodiments, the silencing cavity 520 is a plurality of silencing cavities 520, and the plurality of silencing cavities 520 are sequentially and spacedly arranged along the air outlet direction of the air duct 410.

[0148]

[0149] In some disclosed embodiments, the plurality of silencing cavities 520 have the same or different depths.

[0150] In some embodiments, the depth of the sound-damping cavity 520 is related to the frequency of the noise in the air duct 410.

[0151] In some embodiments, the depth of the sound-damping cavity 520 is set according to the following formula:

[0152] f = (c / l1)(2n + 1) / 4;

[0153] where f is the frequency of the noise, c is the speed of sound, l1 is the depth of the sound-damping cavity 520, and n is a positive integer.

[0154] In some embodiments, the sound-damping cavity 520 is provided on both sides of the air duct 410.

[0155]

[0156] In some embodiments, the sound-damper 500 is also provided at the first air outlet 430 or the first air inlet 420.

[0157] In some embodiments, the projection of the first air outlet 430 along the air outlet direction of the air duct 410 is located within the projection of the air duct 410 along the air outlet direction of the air duct 410.

[0158] In some embodiments, the impedance of the first air outlet 430 is different from the impedance of the air duct 410.

[0159] In some embodiments, there are multiple first air outlets 430.

[0160] In some embodiments, there are two first air outlets 430, and the two first air outlets 430 are respectively located on both sides of the central axis of the air duct 410.

[0161] In some embodiments, the width of the air duct 410 gradually decreases and then increases along the direction from the first air inlet 420 to the first air outlet 430.

[0162] In some embodiments, the air duct 410 is a curved channel.

[0163] In some embodiments, the air duct 410 has a first air section 412 and a second air section 413, the first air section 412 is connected to the first air inlet 420, the second air section 413 is connected to the first air outlet 430, and the width of the first air section 412 is smaller than the width of the second air section 413.

[0164] In some embodiments, part of the first air section 412 is located outside the second air section 413, and part of the first air section 412 is located inside the second air section 413.

[0165] In some embodiments, the cleaning device 10 comprises:

[0166] a main body 200;

[0167] a water tank 300 mounted on the main body 200 and forming an air duct 410 with the main body 200.

[0168] In some embodiments, the water tank 300 is a sewage tank.

[0169] In some embodiments, a baffle 510 is included, the baffle 510 is in contact with the main body 200, and the baffle 510, the main body 200 and the water tank 300 form the air duct 410 and the muffler 500.

[0170] In some embodiments, the baffle 510 is arranged on the main body 200 or the water tank 300.

[0171] In some embodiments, the fan assembly 100 comprises:

[0172] a housing 110 having a receiving cavity 112, a second air inlet 113 and a second air outlet 114 in communication with the receiving cavity 112;

[0173] a fan wheel 120 arranged in the receiving cavity 112;

[0174] In some embodiments, a noise reduction cavity 115 in communication with the receiving cavity 112 is arranged in the housing 110, the noise reduction cavity 115 is located between the fan wheel 120 and the second air outlet 114, and the angle between the depth direction of the noise reduction cavity 115 and the air outlet direction of the second air outlet 114 ranges from 0° to 180°, so as to reduce noise.

[0175] In some embodiments, the second air inlet 113 comprises a plurality of second air inlets 113 arranged in a ring shape on the housing 110.

[0176] In some embodiments, the distance between the noise reduction cavity 115 and the second air outlet 114 is less than the distance between the noise reduction cavity 115 and the second air inlet 113.

[0177] In some embodiments, the second air inlet 113 and the second air outlet 114 are arranged at two ends of the housing 110 respectively, the noise reduction cavity 115 is arranged on the side wall of the housing 110, and the depth direction of the noise reduction cavity 115 is perpendicular to the air outlet direction of the second air outlet 114.

[0178] In some embodiments, the noise reduction cavity 115 comprises a plurality of noise reduction cavities 115 arranged at intervals.

[0179] The embodiments of the present disclosure provide a cleaning device comprising:

[0180] a fan assembly 100, the fan assembly 100 having a second air outlet;

[0181] the air duct 410 discharges air for the fan assembly 100

[0182] a first air outlet 430 and a first air inlet 420 in communication with the air duct 410, the first air inlet 420 being in communication with the second air outlet 114 of the fan assembly 100;

[0183] the air duct 410 has a first air section 412 and a second air section 413, the first air section 412 being connected with the first air inlet 420, and the second air section 413 being connected with the first air outlet 430, the width of the first air section 412 being smaller than the width of the second air section 413.

[0184]

[0185] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present specification.

[0186] In addition, the technical solutions among the various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable. It should be considered that the combination of such technical solutions does not exist and is not within the protection scope required by the present disclosure.

[0187] Although the embodiments of the present disclosure have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present disclosure, and the scope of the present disclosure is defined by the claims and their equivalents.

[0188] The above describes certain embodiments of the present specification, which, together with other embodiments, are covered by the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily follow the specific order or continuous order shown to achieve the desired results. In some embodiments, multi-task processing and parallel processing are also possible or advantageous.

[0189] It is also to be noted that the terms "comprising", "including", and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a... " does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0190] It should be understood that the above-described embodiments are merely for the purpose of illustration and are not intended to limit the present application. Those skilled in the art can implement the present application in other ways without departing from the spirit and essential characteristics of the present application. The scope of the present application is defined by the appended claims, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of one or more embodiments described in the specification shall be encompassed therein.

Claims

1. A cleaning device, comprising: a fan assembly (100) providing suction force for the cleaning device, the fan assembly (100) having a second air outlet (114); an air duct (410); a first air outlet (430) and a first air inlet (420) in communication with the air duct (410), the first air inlet (420) being in communication with the second air outlet (114) of the fan assembly (100); wherein the air duct (410) is provided with a muffler (500) to attenuate noise.

2. The cleaning apparatus of claim 1, wherein, The muffler (500) comprises a muffling cavity (520) arranged at an angle with the air outlet direction of the air duct (410).

3. The cleaning apparatus of claim 2, wherein, The muffling cavity (520) and the air duct (410) are in communication through a communication port (530), and the length of the communication port (530) is less than the length of the muffling cavity (520) in the air outlet direction of the air duct (410).

4. The cleaning apparatus of claim 3, wherein, The communication port (530) has a plurality of communication ports (530) arranged in sequence along the air outlet direction of the air duct (410).

5. The cleaning apparatus of claim 4, wherein, One of the muffling cavities has a plurality of communication ports.

6. The cleaning apparatus of claim 3, wherein, The length of the communication port (530) is the same as the length of the muffling cavity (520) in the air outlet direction of the air duct (410).

7. The cleaning apparatus of claim 3, wherein, The muffling cavities (520) are a plurality of muffling cavities (520) arranged in sequence along the air outlet direction of the air duct (410).

8. The cleaning apparatus of claim 7, wherein, The depths of the plurality of muffling cavities (520) are the same or different.

9. The cleaning apparatus of claim 2, wherein, The depth of the muffling cavity (520) is related to the frequency of the noise in the air duct (410).

10. The cleaning apparatus of claim 9, wherein, The depth of the muffling cavity (520) is set according to the following formula: f = (c / l1)(2n+1) / 4; wherein f is the frequency of the noise, c is the speed of sound, l1 is the depth of the muffling cavity (520), and n is a positive integer.

11. The cleaning apparatus of claim 2, wherein, The muffling cavities (520) are arranged on both sides of the air duct (410).

12. The cleaning apparatus of any one of claims 1-11, wherein, The muffler (500) is also arranged at the first air outlet (430) or the first air inlet (420).

13. The cleaning apparatus of any one of claims 1-11, wherein, The projection of the first air outlet (430) in the air outlet direction of the air duct (410) is located within the projection of the air duct (410) in the air outlet direction of the air duct (410).

14. The cleaning apparatus of claim 1, wherein, The impedance of the first air outlet (430) is different from the impedance of the air duct (410).

15. The cleaning apparatus of claim 13, wherein, The first air outlet (430) has a plurality of first air outlets (430).

16. The cleaning apparatus of claim 13, wherein, The first air outlet (430) has two first air outlets (430) located on both sides of the central axis of the air duct (410).

17. The cleaning apparatus of claim 13, wherein, In the direction from the first air inlet (420) to the first air outlet (430), the width of the air duct (410) gradually decreases and then increases.

18. The cleaning apparatus of any one of claims 1-17, wherein, The air duct (410) is a curved channel.

19. The cleaning apparatus of claim 18, wherein, The air duct (410) has a first air section (412) and a second air section (413), the first air section (412) is connected with the first air inlet (420), the second air section (413) is connected with the first air outlet (430), and the width of the first air section (412) is smaller than the width of the second air section (413).

20. The cleaning apparatus of claim 19, wherein, Part of the first air section (412) is located outside the second air section (413), and part of the first air section (412) is located inside the second air section (413).

21. The cleaning apparatus of any one of claims 1-20, wherein, The cleaning device (10) comprises: a main body (200); a water tank (300) mounted on the main body (200) and forming the air duct (410) with the main body (200).

22. The cleaning apparatus of claim 21, wherein, The water tank (300) is a sewage tank.

23. The cleaning apparatus of claim 21, wherein, The cleaning device (100) comprises a blocking rib (510), and the blocking rib (510), the main body (200), and the water tank (300) form the air duct (410) and the silencer (500).

24. The cleaning apparatus of claim 23, wherein, The blocking rib (510) is arranged on the main body (200) or the water tank (300).

25. The cleaning apparatus of any one of claims 1-24, wherein, The fan assembly (100) comprises: a housing (110) having a containing cavity (112), a second air inlet (113), and a second air outlet (114) communicating with the containing cavity (112); a fan wheel (120) arranged in the containing cavity (112).

26. The cleaning apparatus of claim 25, wherein, The housing (110) is provided with a noise reduction cavity (115) communicating with the containing cavity (112), the noise reduction cavity (115) is located between the fan wheel (120) and the second air outlet (114), and the angle between the depth direction of the noise reduction cavity (115) and the air outlet direction of the second air outlet (114) ranges from 0° to 180°, so as to reduce noise.

27. The cleaning apparatus of claim 25, wherein, The second air inlet (113) comprises a plurality of second air inlets (113), and the plurality of second air inlets (113) are arranged in the housing (110) in a ring shape.

28. The cleaning apparatus of claim 25, wherein, The distance between the noise reduction cavity (115) and the second air outlet (114) is smaller than the distance between the noise reduction cavity (115) and the second air inlet (113).

29. The cleaning apparatus of claim 25, wherein, The second air inlet (113) and the second air outlet (114) are respectively arranged at two ends of the housing (110), the noise reduction cavity (115) is arranged on the side wall of the housing (110), and the depth direction of the noise reduction cavity (115) is perpendicular to the air outlet direction of the second air outlet (114).

30. The cleaning apparatus of claim 25, wherein, The noise reduction cavity (115) comprises a plurality of noise reduction cavities (115), and the plurality of noise reduction cavities (115) are arranged at intervals.

31. A cleaning device, comprising: a fan assembly (100) having a second air outlet; an air duct (410); a first air outlet (430) and a first air inlet (420) communicating with the air duct (410), the first air inlet (420) communicating with the second air outlet (114) of the fan assembly (100); The air duct (410) has a first air section (412) and a second air section (413), the first air section (412) is connected with the first air inlet (420), the second air section (413) is connected with the first air outlet (430), and the width of the first air section (412) is less than the width of the second air section (413).

32. A cleaning system characterized by, The cleaning device of any one of claims 1-31. The cleaning device of any one of claims 1-31.

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