Fan assembly, cleaning apparatus and cleaning system

Abstract

A fan assembly (110), comprising: a housing (110) and a wind wheel (120), wherein the housing (110) has an accommodating cavity (112), and an air inlet (113) and an air outlet (114) which are in communication with the accommodating cavity (112); the wind wheel (120) is arranged in the accommodating cavity (112); and a muffling cavity (115) in communication with the accommodating cavity (112) is provided in the housing (110), the muffling cavity (115) being located between the wind wheel (120) and the air outlet (114), and the direction of the depth of the muffling cavity (115) and an air output direction of the air outlet (114) being set at an included angle. The present disclosure further relates to a cleaning apparatus and a cleaning system.

Description

A fan assembly, a cleaning device and a cleaning system Cross-reference to Related Applications

[0001] This application claims priority to Chinese Patent Application No. 2024208167168, filed on April 18, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure belongs to the technical field of electrical appliances, and in particular relates to a fan assembly, a cleaning device and a cleaning system. BACKGROUND

[0003] Fan assemblies are widely used in electrical appliances, especially in cleaning devices. The fan assembly is mainly used to make air flow quickly in the electrical appliance, 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 related technologies, the fan assembly has relatively large noise during operation. SUMMARY

[0004] The present disclosure aims to at least be able to improve the technical problem of the fan assembly having relatively large noise. To this end, the present disclosure provides a fan assembly, a cleaning device and a cleaning system.

[0005] In a first aspect, the present disclosure provides a fan assembly, comprising: a housing having a receiving cavity, an air inlet and an air outlet which are in communication with the receiving cavity; a fan wheel arranged in the receiving cavity; wherein the housing is provided with a sound attenuation cavity which is in communication with the receiving cavity, the sound attenuation cavity is located between the fan wheel and the air outlet, and the depth direction of the sound attenuation cavity is arranged at an angle with the air outlet direction, so as to reduce noise.

[0006] The sound attenuation cavity is arranged between the fan wheel and the air outlet, and the depth direction of the sound attenuation cavity is arranged at an angle with the air outlet direction, i.e. the depth direction of the sound attenuation cavity is arranged at an angle with the direction of the air duct in the receiving cavity. When the noise propagates to the receiving cavity, it will diffuse and move to the bottom wall of the receiving cavity and then reflect, 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 air outlet to a certain extent.

[0007] In a second aspect, the present disclosure provides a fan assembly, comprising: a housing having a receiving cavity, an air inlet and an air outlet which are in communication with the receiving cavity, the housing further having a sound attenuation cavity which is in communication with the receiving cavity; wherein the sound attenuation cavity is located between the air inlet and the air outlet, and the angle between the depth direction of the sound attenuation cavity and the air outlet direction of the air outlet ranges from 0° to 180°, so as to reduce noise.

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

[0009]

[0010] In the third aspect, the disclosure provides a cleaning device, which comprises a main body and the fan assembly provided by the first aspect, and the fan assembly is connected to the main body.

[0011] The cleaning device provided by the third aspect has the same advantages as the fan assembly provided by the first aspect, which will not be repeated here.

[0012] In the fourth aspect, the disclosure provides a cleaning system, which comprises a base station and the cleaning device provided by the third aspect.

[0013] The cleaning system provided by the fourth aspect has the same advantages as the cleaning device provided by the third aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0014] The above and various other advantages and benefits 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.

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the disclosure, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are some embodiments of the disclosure, and for those ordinarily skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0016] FIG. 1 shows a structural schematic diagram of a fan assembly provided by one of the embodiments of the disclosure.

[0017] FIG. 2 shows a sectional view of the fan assembly provided by FIG. 1.

[0018] FIG. 3 shows a noise comparison diagram at the air outlet after an acoustic cavity is arranged in the accommodating cavity in the embodiment of the disclosure.

[0019] FIG. 4 shows a structural schematic diagram of a fan assembly provided by another embodiment of the disclosure.

[0020] FIG. 5 shows a sectional view of the fan assembly provided by FIG. 4.

[0021] Reference signs: 100-fan assembly; 110-housing; 112-accommodating cavity; 113-air inlet; 114-air outlet; 115-acoustic cavity; 115a-bottom wall; 115b-opening; 120-fan wheel. DETAILED DESCRIPTION

[0022] The present application will be further described below with reference to the drawings and specific embodiments. The following description is merely illustrative of the principles of the application and is not in limitation thereof.

[0023] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the 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 of ordinary skill in the art without creative work under the premise that the specific working conditions are changed, fall within the scope of protection of the present disclosure.

[0024] 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 specific posture, and if the specific posture is changed, the directional indications will also change accordingly.

[0025] In the present disclosure, unless otherwise explicitly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense, for example, "fixation" 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 otherwise explicitly limited. For those of ordinary skill in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0026] In addition, the description such as "first", "second", etc. in the present disclosure 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 limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that those of ordinary skill 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 scope of protection required by the present disclosure.

[0027] The fan assembly is widely used in electrical appliances, especially in cleaning devices. The fan assembly is mainly used to make air flow quickly in the electrical appliance, 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 has the problem of loud noise during operation due to excessive wind speed or abnormal noise of the fan wheel. The fan assembly and cleaning device provided by the embodiments of the present disclosure can improve the above problems to a certain extent, and the fan assembly, cleaning device and cleaning system provided by the embodiments of the present disclosure can reduce the noise of the fan assembly during operation and reduce the influence of noise on users.

[0028] The present disclosure will be described below in conjunction with the accompanying drawings and specific embodiments:

[0029] Please refer to FIG. 1 and FIG. 2, the embodiments of the present disclosure provide a fan assembly 100, the fan assembly 100 provided by the embodiments of the present disclosure can reduce the noise of the fan assembly 100 during operation and improve the user experience.

[0030] 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 receiving cavity 112, an air inlet 113 and an air outlet 114 which communicate with the receiving cavity 112; the fan wheel 120 is arranged in the receiving cavity 112; wherein the housing 110 is provided with a sound attenuation cavity 115 which communicates with the receiving cavity 112, the sound attenuation cavity 115 is located between the fan wheel 120 and the air outlet 114, the depth direction of the sound attenuation cavity 115 is arranged at an angle with the air outlet direction of the air outlet 114, so as to reduce the noise.

[0031] In some embodiments, the housing 110 is the main body of the entire fan assembly 100, the housing 110 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 receiving cavity 112, which can protect the fan wheel 120 and other structures of the fan assembly 100 to a certain extent, and reduce damage to the fan wheel 120 and other structures caused by external dust, particles and other impurities.

[0032] The air inlet 113 includes a plurality of air inlets 113, and the plurality of air inlets 113 are arranged in the housing 110 in a ring shape. The air inlet 113 is provided in multiple, and the total area of the plurality of air inlets 113 is the air inlet area of the entire fan assembly 100. Under the condition that the air inlet area is the same, compared with setting one large air inlet, setting multiple smaller air inlets 113 can divide the gas into multiple streams in advance, which can reduce the noise caused by the gathering of the gas, and further reduce the volume of the noise.

[0033] In some embodiments, the distance between the sound attenuation cavity 115 and the air outlet 114 is less than the distance between the sound attenuation cavity 115 and the air inlet 113. Since the gas flows from the air inlet 113 to the air outlet 114, the sound attenuation cavity 115 is arranged close to the air outlet 114, so that the noise in the gas flowing out of the air outlet 114 can be eliminated as much as possible, and the noise 114 can be reduced from spreading to the outside from the air outlet 114.

[0034] In some embodiments, the outer end surface of the air outlet 114 is not parallel to the outer end surface of the air inlet 113, so that the air passage between the air inlet 113 and the air outlet 114 has an angle, which can increase the flow path of the gas in the housing 110, and can also reduce the noise to some extent.

[0035] The air inlet 113 and the 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 air inlet 113 and is discharged from the air outlet 114. The area between the air inlet 113 and the air outlet 114 forms an air passage for the gas flow. Since the fan wheel 120 generates noise during operation, the noise will also spread to the outside from the air outlet 114, resulting in a large noise of the cleaning device during operation, which affects the user's experience.

[0036] In the embodiments of the present disclosure, the sound attenuation cavity 115 is arranged between the fan wheel 120 and the air outlet 114, and the depth direction of the sound attenuation cavity 115 is arranged at an angle with the air outlet direction of the air outlet 114, that is, the depth direction of the sound attenuation cavity 115 is arranged at an angle with the direction of the air passage in the containing cavity 112. When the noise propagates to the sound attenuation cavity 115, it will spread and move to the bottom wall 115a of the sound attenuation cavity 115 and then be reflected, and finally return to the air passage, and superimpose with the noise in the air passage, thereby achieving the purpose of noise attenuation, and reducing the noise volume spreading to the outside from the air outlet 114 to some extent.

[0037] It should be noted that the sound attenuation cavity 115 can play a certain role in noise attenuation. The depth of the sound attenuation cavity 115 is related to the wavelength of the noise. When the phase of the noise reflected from the sound attenuation cavity 115 to the air passage is opposite to the phase of the noise in the air passage within two half waves, the noise reflected from the sound attenuation cavity 115 and the noise in the air passage can weaken the noise volume spreading to the outside from the air outlet 114 to some extent after superimposition.

[0038] In some embodiments, the angle between the depth direction of the sound attenuation cavity 115 and the air outlet direction of the air outlet 114 ranges from 0° to 180°, and can be 30°, 45°, 90°, 135°, 150°, etc.

[0039] In some embodiments, the bottom wall 115a of the sound attenuation cavity 115 refers to the wall opposite to the opening 115b of the sound attenuation cavity 115, not the wall at the lowest position of the sound attenuation cavity 115 when the fan assembly 100 is in the working state. The depth of the sound attenuation cavity 115 refers to the distance from the opening 115b of the sound attenuation cavity 115 to the bottom wall 115a of the sound attenuation cavity 115.

[0040] Since the model of the fan wheel 120 is determined when the fan assembly 100 is shipped, the size of the housing 110 is determined, the installation position of the fan wheel 120 in the housing 110 is determined, and the model and installation position of other components of the fan assembly 100 on the housing 110 are determined, the frequency of the noise generated by the fan assembly 100 during the working process is also determined. Therefore, the depth of the sound attenuation cavity 115 can be set according to the frequency of the noise, so that the volume of the noise flowing out of the air outlet 114 can be reduced.

[0041] In some embodiments, the depth of the sound attenuation cavity 115 is set according to the following formula:

[0042] f = (c / l)(2n+1) / 4;

[0043] f is the frequency of the noise, c is the speed of the noise, l is the depth of the sound attenuation cavity 115, and n is zero or a positive integer.

[0044] According to the above formula, l = (c / f)(2n+1) / 4 can be obtained. 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 depth of the sound attenuation cavity 115 is equal to an odd multiple of one-quarter of the wavelength of the noise. The depth of the sound attenuation cavity 115 is related to one-quarter of the wavelength of the noise. The sound attenuation cavity 115 can be a one-quarter wavelength tube. When the noise in the containing cavity 112 enters the sound attenuation cavity 115, the noise is reflected in the sound attenuation cavity 115 and then propagates to the connection between the sound attenuation cavity 115 and the containing cavity 112 again. The noise from the containing cavity 112 to the sound attenuation cavity 115 and then reflected from the sound attenuation cavity 115 to the containing cavity 112 has a travel distance of exactly half a wavelength. The noise reflected from the sound attenuation cavity 115 to the containing cavity 112 has a 180-degree phase difference with the noise in the containing cavity 112 without reflection. After superposition, the noise 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.

[0045] That is, in some embodiments, the depth of the sound attenuation cavity 115 is set to an odd multiple of one-quarter of the wavelength of the noise, so that the noise reflected in the sound attenuation cavity 115 has a 180-degree phase difference with the noise in the containing cavity 112 without passing through the sound attenuation cavity 115. After superposition, the two can interfere with each other, thereby achieving the purpose of noise reduction.

[0046] As shown in FIG. 3, the abscissa represents the frequency of the noise, and the ordinate represents the volume of the noise. As can be seen from FIG. 3, the frequency of the noise is not a point value, but a frequency band, and the depth of the sound-absorbing cavity 115 corresponds to the frequency at point A in the figure. In FIG. 3, the original state refers to the volume of the noise generated when the fan assembly 100 is working without the sound-absorbing cavity 115, and the added sound-absorbing cavity 115 refers to the volume of the noise generated when the fan assembly 100 is working after the sound-absorbing cavity 115 is arranged in the shell 110, as shown by point B. Compared with point A, the noise is reduced. As can be seen from FIG. 3, after the sound-absorbing cavity 115 is arranged, the volume corresponding to the frequency can be adaptively reduced, and the user experience can be improved.

[0047] It should be noted that, during the working process of the fan assembly 100, the frequency of the noise is often not a point value, but a frequency band, and there may be several specific frequencies of the noise in the frequency band, which are particularly high or have a particularly large volume. When the depth of the sound-absorbing cavity 115 is arranged, the wavelength of the noise at the specific frequency can be used for arrangement, so that the noise at the specific frequency can be eliminated. In addition, the sound-absorbing cavity 115 can also be arranged as a variable sound-absorbing cavity 115, so that the depth of the sound-absorbing cavity 115 can correspond to all the frequencies of the noise in the frequency band, thereby weakening the noise generated during the operation of the fan assembly 100 and improving the user experience.

[0048] In some embodiments, the air inlet 113 and the air outlet 114 are arranged at two ends of the shell 110 respectively, and the sound-absorbing cavity 115 is arranged on the side wall of the shell 110, and the depth direction of the sound-absorbing cavity 115 is perpendicular to the air outlet direction of the air outlet 114.

[0049] The shell 110 is generally in a strip shape, and the two ends of the shell 110 refer to 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 air inlet 113 and the air outlet 114 are arranged at the two ends of the shell 110 respectively, so that 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.

[0050] The sound-absorbing cavity 115 is arranged on the side wall of the shell 110 and extends away from the containing cavity 112, and the movement direction of the noise in the sound-absorbing 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 sound-absorbing cavity 115, so that the noise can overlap with the noise in the shell 110 after being reflected by the sound-absorbing cavity 115, thereby interfering with each other, so that the noise can be weakened, and the user experience can be improved.

[0051] In some embodiments, the depth direction of the sound damping cavity 115 is perpendicular to the air outlet direction of the air outlet 114. When the noise moves from the shell 110 to the sound damping cavity 115, the movement path in the sound damping 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.

[0052] In some embodiments, the sound damping cavity 115 is multiple, and the multiple sound damping cavities 115 are arranged at intervals.

[0053] The extension direction of the multiple sound damping cavities 115 can be the same or different, and can be arranged according to the space in the containing cavity 112, the arrangement position of the fan wheel 120, the relative position between the air outlet 114 and the fan wheel 120, and the like.

[0054] The interval distance between the adjacent two sound damping cavities 115 can be the same or different, and can be arranged according to the arrangement structure of the entire fan assembly 100.

[0055] Similarly, the shapes of the multiple sound damping cavities 115 can be the same or different, and can be that the shapes of the multiple sound damping cavities 115 are all the same, or the shapes of the multiple sound damping cavities 115 are all different, or the shapes of part of the sound damping cavities 115 are the same and the shapes of part of the sound damping cavities 115 are different.

[0056] In addition, the lengths of the multiple sound damping cavities 115 can be the same or different, and can be that the lengths of the multiple sound damping cavities 115 are all the same, or the lengths of the multiple sound damping cavities 115 are all different, or the lengths of part of the sound damping cavities 115 are the same and the lengths of part of the sound damping cavities 115 are different.

[0057] In some embodiments, in the direction from the air inlet 113 to the air outlet 114, the depths of the sound damping cavities 115 are the same.

[0058] The direction from the air inlet 113 to the air outlet 114 refers to the direction of the gas flow in the shell 110. In the gas flow direction, the depths of the sound damping cavities 115 are the same, which means that the sound damping cavities 115 can only weaken one frequency of noise. As to which frequency of noise the depth of the sound damping cavity 115 corresponds to, it can be the noise with the largest frequency in the noise frequency band, or the frequency of the noise with the largest volume.

[0059] The depths of the sound damping cavities 115 can be the same at all positions of the same sound damping cavity 115, or the depths of the multiple sound damping cavities 115 are the same.

[0060] In some embodiments, in the direction from the air inlet 113 to the air outlet 114, the depths of the sound damping cavities 115 decrease in turn.

[0061] The depth of the sound attenuation cavity 115 decreases in sequence in the direction from the air inlet 113 to the air outlet 114. As the depth of the sound attenuation cavity 115 changes, the corresponding frequency of the noise also changes, so that the sound attenuation 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 air outlet 114, thereby improving the user experience.

[0062] The depth of the sound attenuation cavity 115 decreasing in sequence can mean that the depth of the same sound attenuation cavity decreases in the direction from the air inlet 113 to the air outlet 114, or that the depth of the sound attenuation cavities 115 decreases in sequence in the direction from the air inlet 113 to the air outlet 114.

[0063] In some other embodiments, the depth of at least two sound attenuation cavities 115 is different in the direction from the air inlet 113 to the air outlet 114.

[0064] The depth of the sound attenuation cavity 115 is related to the quarter wavelength of the noise, and one depth of the sound attenuation cavity 115 can weaken the noise of one frequency. The depth of at least two sound attenuation cavities 115 being different means that the noise of at least two frequencies can be weakened. In the entire frequency band of the noise, there can be several noises with large volumes or high frequencies. When the depth of the sound attenuation cavity 115 can be set to multiple different depths, the depth of the sound attenuation 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.

[0065] In some embodiments, the sound attenuation cavity 115 has an opening 115b in communication with the containing cavity 112, and the projection area of the sound attenuation 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 in the depth direction of the sound attenuation cavity 115.

[0066] The projected area of the sound attenuation cavity 115 at the opening 115b refers to the projected area of the sound attenuation cavity 115 on the side wall 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 sound attenuation 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 sound attenuation 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. The sound volume that can be attenuated by the sound attenuation cavity 115 is related to the projected area of the sound attenuation 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 sound attenuation cavity 115 at the opening 115b is equal to the cross-sectional area of the accommodating cavity 112 at the opening 115b, the sound attenuation cavity 115 can substantially eliminate noise of the corresponding frequency. The closer the projected area of the sound attenuation cavity 115 at the opening 115b to the cross-sectional area of the accommodating cavity 112 at the opening 115b, the better the sound attenuation effect.

[0067] In some embodiments, the ratio of the projected area of the sound attenuation 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 sound attenuation cavity 115 is [0.8-1], and it can be considered that the projected area of the sound attenuation 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. In this case, the sound attenuation cavity 115 has a better sound attenuation effect.

[0068] The shape of the sound attenuation cavity 115 can not be specifically limited, and can be rectangular, circular, trapezoidal, or irregular, etc. Similarly, the length of the sound attenuation 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 air outlet 114 and the fan wheel 120.

[0069] For example, in the case of a long strip-shaped sound attenuation cavity 115, the length direction of the sound attenuation cavity 115 can be arranged along the direction in which the fan wheel 120 approaches the air outlet 114, or the width direction of the sound attenuation cavity 115 can be arranged along the direction in which the fan wheel 120 approaches the air outlet 114. In addition, the length direction of the sound attenuation cavity 115 can be arranged at an angle to the direction in which the fan wheel 120 approaches the air outlet 114.

[0070] In some embodiments, the depths of any two sound attenuation cavities 115 are the same or different.

[0071] The depths of any two of the sound-absorbing cavities 115 are the same or different, the depths of the sound-absorbing cavities 115 are the same, the depths of the sound-absorbing cavities 115 are different, the depths of some of the sound-absorbing cavities 115 are the same, and the depths of some of the sound-absorbing cavities 115 are different. That is, the sound-absorbing cavities 115 can be of different depths.

[0072] 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 sound-absorbing cavities 115 of different depths can correspond to multiple frequencies in the noise, so as to correspond to multiple frequencies of the noise to be weakened and improve the sound-absorbing effect.

[0073] In the foregoing, along the depth direction of the sound-absorbing cavity 115, the projection area of the sound-absorbing cavity 115 at the opening 115b is less than or equal to the cross-sectional area of the accommodating cavity 112 at the opening 115b. When the sound-absorbing cavities 115 are multiple and the depths of the sound-absorbing cavities 115 are the same, the sum of the projection areas of the sound-absorbing cavities 115 at the opening 115b can be less than or equal to the cross-sectional area of the accommodating cavity 112 at the opening 115b.

[0074] In some embodiments, in the direction from the air inlet 113 to the air outlet 114, the sound-absorbing cavities 115 are arranged in sequence and spaced apart (as shown in FIGS. 1 and 2) or arranged side by side (as shown in FIGS. 4 and 5).

[0075] Since the sound-absorbing cavities 115 are arranged between the fan wheel 120 and the air outlet 114, in the direction from the air inlet 113 to the air outlet 114, which is also the direction from the fan wheel 120 to the air outlet 114, the sound-absorbing cavities 115 arranged in sequence and spaced apart means that the sound-absorbing cavities 115 are arranged in sequence and overlapped in the direction from the air inlet 113 to the air outlet 114, and the sound-absorbing cavities 115 arranged side by side means that the sound-absorbing cavities 115 are arranged in the same direction as the direction from the air inlet 113 to the air outlet 114.

[0076] For example, when the sound-absorbing cavities 115 are long strips, the sound-absorbing cavities 115 arranged in sequence and spaced apart means that the sound-absorbing cavities 115 are arranged in sequence and overlapped in the width direction along the direction from the air inlet 113 to the air outlet 114. The sound-absorbing cavities 115 arranged side by side means that the sound-absorbing cavities 115 are arranged in the length direction along the direction from the air inlet 113 to the air outlet 114.

[0077] 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 air outlet 114, and after the noise moves to the sound attenuation cavity 115, the noise moves along the depth direction of the sound attenuation cavity 115, and after being reflected by the bottom wall 115a of the sound attenuation cavity 115, the noise has a 180-degree phase difference with the noise that is not reflected by the sound attenuation cavity 115 in the containing cavity 112, and the two can interfere with each other after superposition.

[0078] In summary, the fan assembly 100 provided by the embodiments of the present disclosure is provided with the sound attenuation cavity 115 between the fan wheel 120 and the air outlet 114, the depth direction of the sound attenuation cavity 115 is arranged at an angle with the air outlet direction of the air outlet 114, that is, the depth direction of the sound attenuation 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, the noise diffuses to the inside of the containing cavity 112 and is reflected after moving to the bottom wall 115a of the containing cavity 112, and finally returns to the air duct, and superimposes with the noise that is not reflected by the sound attenuation cavity 115 in the air duct, thereby achieving the purpose of sound attenuation, and reducing the noise volume from the air outlet 114 to a certain extent.

[0079] Based on the same inventive concept, the embodiments of the present disclosure further provide a cleaning device comprising the fan assembly 100 described above and a main body.

[0080] The cleaning device can be a floor washing machine or a floor sweeping robot.

[0081] Based on the same inventive concept, the embodiments of the present disclosure further provide a cleaning system comprising a base station and the cleaning device described above.

[0082] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like 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 description of the above terms does not necessarily refer to the same embodiment or example. Moreover, 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.

[0083] In addition, the technical solutions of each embodiment 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 cannot be realized, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the present disclosure.

[0084] While embodiments of the present disclosure have been shown and described with reference to particular embodiments thereof, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the present disclosure, which is defined by the appended claims and their equivalents.

[0085] The above description of certain implementations has been presented for the purpose of illustration and description. It is not intended to be exhaustive or to limit the claims to the precise form disclosed. Many modifications and variations are possible in light of the above teaching. It is intended that the scope of the claims and the solutions outlined above be limited only by the following claims.

[0086] It should also 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 also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element preceded by "comprises a... " does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0087] It is to be understood that the embodiments described above are merely illustrative of the present application and that modifications of structure, subcombinations of elements, and / or equivalents thereof can occur to persons skilled in the art while still falling within the spirit and scope of the present application. The scope of the present application is limited only by the claims below.

Claims

1. A fan assembly, comprising: a housing (110) having a receiving cavity (112) and an air inlet (113) and an air outlet (114) communicating with the receiving cavity (112); a fan wheel (120) arranged in the receiving cavity (112); a sound attenuation cavity (115) is arranged in the housing (110) and communicates with the receiving cavity (112), the sound attenuation cavity (115) is located between the fan wheel (120) and the air outlet (114), and the depth direction of the sound attenuation cavity (115) is arranged at an angle with the air outlet direction of the air outlet (114) to reduce noise.

2. The fan assembly of claim 1, wherein, The air inlet (113) and the air outlet (114) are arranged at two ends of the housing (110) respectively, and the sound attenuation cavity (115) is arranged on the side wall of the housing (110). 3.The fan assembly of claim 2, wherein the depth direction of the sound attenuation cavity (115) is perpendicular to the air outlet direction of the air outlet (114).

4. The fan assembly of any one of claims 1-3, wherein, There are a plurality of sound attenuation cavities (115), and the plurality of sound attenuation cavities (115) are arranged at intervals.

5. The fan assembly of claim 4, wherein, The depths of any two sound attenuation cavities (115) are the same or different.

6. The fan assembly of claim 4, wherein, In the direction from the air inlet (113) to the air outlet (114), the plurality of sound attenuation cavities (115) are arranged at intervals or side by side.

7. The fan assembly of claim 4, wherein, In the direction from the air inlet (113) to the air outlet (114), the depths of the sound attenuation cavities (115) are the same.

8. The fan assembly of claim 4, wherein, In the direction from the air inlet (113) to the air outlet (114), the depths of the sound attenuation cavities (115) decrease in turn.

9. The fan assembly of claim 4, wherein, In the direction from the air inlet (113) to the air outlet (114), the depths of at least two sound attenuation cavities (115) are different.

10. The fan assembly of claim 2, wherein, The sound attenuation cavity (115) has an opening (115b) communicating with the receiving cavity (112), and the ratio of the projection area of the sound attenuation cavity (115) at the opening (115b) to the cross-sectional area of the receiving cavity (112) at the opening (115b) is [0.8-1] along the depth direction of the sound attenuation cavity (115).

11. The fan assembly of any of claims 1-10, wherein, The depth of the sound attenuation cavity (115) is set according to the following formula: f=(c / l)(2n+1) / 4; Wherein, f is the frequency of noise, c is the speed of sound, l is the depth of the sound attenuation cavity, and n is zero or a positive integer. 12.A fan assembly, comprising: a housing (110) having a receiving cavity (112) and an air inlet (113) and an air outlet (114) communicating with the receiving cavity (112), the housing (110) further having a sound attenuation cavity (115) communicating with the receiving cavity (112); The sound attenuation cavity (115) is located between the air inlet (113) and the air outlet (114), and the depth direction of the sound attenuation cavity (115) is at an angle with the air outlet direction of the air outlet (114) in the range of (0°-180°) to reduce noise.

13. The fan assembly of claim 12, wherein, The air inlet (113) comprises a plurality of air inlets (113), and the plurality of air inlets (113) are arranged in the housing (110) in the shape of a ring.

14. The fan assembly of claim 12, wherein, The distance between the sound-absorbing cavity (115) and the air outlet (114) is less than the distance between the sound-absorbing cavity (115) and the air inlet (113).

15. The fan assembly of claim 12, wherein, The fan assembly comprises a fan wheel (120) arranged in the accommodating cavity (112); the sound-absorbing cavity (115) is located between the fan wheel (120) and the air outlet (114).

16. The fan assembly of claim 12, wherein, The air inlet (113) and the air outlet (114) are arranged at two ends of the shell (110) respectively, and the sound-absorbing cavity (115) is arranged on the side wall of the shell (110).

17. The fan assembly of claim 16, wherein, The depth direction of the sound-absorbing cavity (115) is perpendicular to the air outlet direction of the air outlet (114).

18. The fan assembly of any of claims 12-17, wherein, The sound-absorbing cavity (115) is multiple, and the multiple sound-absorbing cavities (115) are arranged at intervals.

19. The fan assembly of claim 18, wherein, The extension directions of the multiple sound-absorbing cavities (115) are the same.

20. The fan assembly of claim 18, wherein, The interval distances of the adjacent two sound-absorbing cavities (115) are the same.

21. The fan assembly of claim 18, wherein, The lengths of the multiple sound-absorbing cavities (115) are the same.

22. The fan assembly of claim 18, wherein, The depths of any two sound-absorbing cavities (115) are the same or different.

23. The fan assembly of claim 18, wherein, In the direction from the air inlet (113) to the air outlet (114), the multiple sound-absorbing cavities (115) are arranged at intervals or side by side.

24. The fan assembly of claim 18, wherein, In the direction from the air inlet (113) to the air outlet (114), the depths of the sound-absorbing cavities (115) are the same.

25. The fan assembly of claim 18, wherein, In the direction from the air inlet (113) to the air outlet (114), the depths of the sound-absorbing cavities (115) decrease in turn.

26. The fan assembly of claim 18, wherein, In the direction from the air inlet (113) to the air outlet (114), the depths of at least two sound-absorbing cavities (115) are different.

27. The fan assembly of claim 16, wherein, The sound-absorbing cavity (115) has an opening (115b) communicating with the accommodating cavity (112), and the projection area of the sound-absorbing cavity (115) at the opening (115b) in the depth direction of the sound-absorbing cavity (115) is less than or equal to the cross-sectional area of the accommodating cavity (112) at the opening (115b).

28. The fan assembly of claim 27, wherein, The ratio of the projection area of the sound-absorbing cavity (115) at the opening (115b) to the cross-sectional area of the accommodating cavity (112) at the opening (115b) is [0.8-1].

29. The fan assembly of claim 27, wherein, The sound-absorbing cavity (115) is multiple, and the depths of the multiple sound-absorbing cavities (115) are the same, and the sum of the projection areas of the multiple sound-absorbing cavities (115) at the opening (115b) is less than or equal to the cross-sectional area of the accommodating cavity (112) at the opening (115b).

30. The fan assembly of any of claims 12-29, wherein, The outer end surface of the air outlet (114) is not parallel to the outer end surface of the air inlet (113).

31. The fan assembly of any of claims 12-29, wherein, The depth of the sound-absorbing cavity (115) is set according to the following formula: f=(c / l)(2n+1) / 4; Wherein, f is the frequency of noise, c is the speed of sound, l is the depth of the sound-absorbing cavity, and n is zero or a positive integer.

32. A cleaning device comprising a main body and a fan assembly (100) according to any one of claims 1-31, wherein the fan assembly (100) is connected to the main body.

33. A cleaning system comprising a base station and a cleaning apparatus as claimed in claim 32.

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