Cleaning equipment and cleaning system

Abstract

The utility model discloses cleaning equipment and a cleaning system, and belongs to the technical field of electrical equipment. The cleaning equipment comprises a fan assembly and an air duct, wherein the fan assembly is provided with a second air outlet; the first air outlet and the first air inlet are communicated with the air duct, and the first air inlet is communicated with the second air outlet of the fan assembly; the air channel is provided with a first air section and a second air section, the first air section is connected with the first air inlet, the second air section is connected with the first air outlet, and the width of the first air section is smaller than that of the second air section. The noise can be reduced to a certain extent after passing through the air duct in the process of flowing along with the air, the noise diffused to the outside can be reduced, and the noise reduction effect is achieved.

Description

[0001] This application is a divisional application of Chinese patent application number 202420813207X, filed on April 18, 2024. Its entire content is incorporated into this article by reference. Technical Field

[0002] This application belongs to the field of electrical equipment technology, and in particular relates to a cleaning device and cleaning system. Background Technology

[0003] Fan assemblies are widely used in electrical equipment, especially in cleaning equipment. Their main function is to enable rapid airflow within electrical equipment, creating negative pressure to achieve cleaning. However, in some technologies, excessive noise levels can occur during operation due to factors such as high airflow speeds or abnormal noise from the impeller. Utility Model Content

[0004] This application aims to at least partially solve the technical problem of excessive noise. To this end, this application provides a cleaning device and a cleaning system.

[0005] In a first aspect, an embodiment of this application provides a cleaning device, comprising:

[0006] Fan assembly, the fan assembly having a second air outlet;

[0007] Air duct; a first air outlet and a first air inlet connected to the air duct, wherein the first air inlet is connected to the second air outlet of the fan assembly;

[0008] The air duct has a first air section and a second air section. The first air section is connected to the first air inlet, and the second air section is connected to the first air outlet. The width of the first air section is smaller than the width of the second air section.

[0009] The first air section is connected to the first air inlet, and the second air section is connected to the first air outlet. When noise enters the second air section from the first air section, the increased width allows the noise to diffuse within the second air section, enabling it to spread in different directions. After being reflected by the inner wall of the air duct, the noise can be superimposed and interfered, which can also play a certain role in noise reduction.

[0010] In an optional embodiment of this application, a silencer is provided in the air duct to reduce noise.

[0011] In an optional embodiment of this application, the silencer includes a silencing cavity, the depth direction of which is set at an angle to the air outlet direction of the air duct.

[0012] In an optional embodiment of this application, the silencing cavity is connected to the air duct through a connecting port, and the length of the connecting port is less than the length of the silencing cavity in the air outlet direction of the air duct.

[0013] In an optional embodiment of this application, there are multiple communication ports, and the multiple communication ports are arranged sequentially along the air outlet direction of the air duct.

[0014] In an optional embodiment of this application, one of the silencing cavities has a plurality of the communication ports.

[0015] In an optional embodiment of this application, the length of the connecting opening is the same as the length of the silencing cavity along the air outlet direction of the air duct.

[0016] In an optional embodiment of this application, there are multiple silencing cavities, which are arranged sequentially at intervals along the air outlet direction of the air duct.

[0017] In optional embodiments of this application, the depths of the plurality of silencing cavities may be the same or different.

[0018] In an optional embodiment of this application, the depth of the silencing cavity is related to the frequency of the noise within the air duct.

[0019] In an optional embodiment of this application, the depth of the silencing cavity is set according to the following formula:

[0020] f = (c / l 1)(2n+1) / 4;

[0021] Where f is the frequency of the noise, c is the speed of sound of the noise, l1 is the depth of the silencing cavity, and n is a positive integer.

[0022] In an optional embodiment of this application, the sound-absorbing cavity is provided on both sides of the air duct.

[0023] In an optional embodiment of this application, the silencer is further disposed at the first air outlet or the first air inlet.

[0024] In an optional embodiment of this application, the projection of the first air outlet along the air outlet direction of the air duct is located within the projection of the air duct along the air outlet direction of the air duct.

[0025] In an optional embodiment of this application, the impedance of the first air outlet is different from the impedance of the air duct.

[0026] In an optional embodiment of this application, the first air outlet has multiple outlets.

[0027] In an optional embodiment of this application, there are two first air outlets, which are located on both sides of the central axis of the air duct.

[0028] In an optional embodiment of this application, the width of the air duct gradually decreases and then increases along the direction from the first air inlet to the first air outlet.

[0029] In an optional embodiment of this application, a portion of the first wind segment is located outside the second wind segment, and a portion of the first wind segment is located inside the second wind segment.

[0030] In an optional embodiment of this application, the air duct is a bent channel.

[0031] In an optional embodiment of this application, the cleaning device includes:

[0032] main body;

[0033] A water tank is installed on the main body and forms the air duct between the water tank and the main body.

[0034] In an optional embodiment of this application, the water tank is a sewage tank.

[0035] In an optional embodiment of this application, the cleaning device includes a baffle rib that contacts the main body, and the baffle rib, the main body, and the water tank form the air duct and the silencer.

[0036] In an optional embodiment of this application, the baffle is disposed on the main body or the water tank.

[0037] In an optional embodiment of this application, the wind turbine assembly includes:

[0038] The housing has a receiving cavity and a second air inlet and a second air outlet communicating with the receiving cavity;

[0039] The impeller is located inside the receiving cavity.

[0040] In an optional embodiment of this application, a noise reduction cavity communicating with the receiving cavity is provided inside the housing. The noise reduction cavity is located between the impeller and the second air outlet, and the angle between the depth direction of the noise reduction cavity and the air outlet direction of the second air outlet is in the range of (0°-180°) to reduce noise.

[0041] In an optional embodiment of this application, the second air inlet includes a plurality of inlets, which are arranged in a ring shape on the housing.

[0042] In an optional embodiment of this application, the distance between the noise reduction cavity and the second air outlet is less than the distance between the noise reduction cavity and the second air inlet.

[0043] In an optional embodiment of this application, the second air inlet and the second air outlet are respectively disposed at both ends of the housing, the noise reduction cavity is disposed on the side wall of the housing, and the depth direction of the noise reduction cavity is perpendicular to the air outlet direction of the second air outlet.

[0044] In an optional embodiment of this application, there are multiple noise reduction cavities, and the multiple noise reduction cavities are spaced apart.

[0045] Secondly, embodiments of this application provide a cleaning system, including a base station and the cleaning equipment provided in the first aspect.

[0046] The beneficial effects of the cleaning system provided in the second aspect are the same as those of the cleaning equipment provided in the first aspect, and will not be repeated here. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 A schematic diagram of the structure of the cleaning equipment provided in an embodiment of this application is shown.

[0049] Figure 2 A cross-sectional view of the cleaning equipment provided in an embodiment of this application is shown.

[0050] Figure 3 A schematic diagram of the structure of the cleaning equipment provided in this application, wherein the silencing cavity is disposed on the water tank, is shown.

[0051] Figure 4 It shows Figure 3 Axonometric drawing.

[0052] Figure 5 The diagram shows a structure in which the silencing cavity of the cleaning device provided in this application has multiple communication ports.

[0053] Figure 6 It shows Figure 5 Axonometric drawing.

[0054] Figure 7 A schematic diagram of a cleaning device provided in an embodiment of this application is shown, showing that the device has multiple silencing cavities.

[0055] Figure 8 It shows Figure 7 Axonometric drawing.

[0056] Figure 9A schematic diagram of a cleaning device provided in an embodiment of this application is shown, showing that the device has multiple silencing cavities.

[0057] Figure 10 It shows Figure 9 Axonometric drawing.

[0058] Figure 11 A schematic diagram of the structure of a wind turbine assembly provided in one embodiment of this application is shown.

[0059] Figure 12 It shows Figure 11 A sectional view of the provided wind turbine assembly.

[0060] Figure 13 The diagram shows a noise comparison at the second air outlet after a noise reduction chamber is installed in the receiving cavity.

[0061] Figure 14 A schematic diagram of the structure of a wind turbine assembly provided in another embodiment of this application is shown.

[0062] Figure 15 It shows Figure 14 A sectional view of the provided wind turbine assembly.

[0063] Reference numerals: 10-cleaning equipment, 100-fan assembly, 110-casing, 112-receiving cavity, 113-second air inlet, 114-second air outlet, 115-noise reduction cavity, 115a-bottom wall, 115b-opening, 120-impeller, 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-silencer, 510-baffle, 520-silencing cavity, 530-connecting port. Detailed Implementation

[0064] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0065] It should be noted that all directional indications in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0066] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0067] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0068] Fan assemblies are widely used in electrical equipment, especially in cleaning equipment. They primarily function to rapidly circulate air within electrical equipment, creating negative pressure to achieve cleaning. However, in related technologies, fan assemblies often exhibit excessive noise during operation due to factors such as high wind speeds or abnormal impeller noise. The fan assembly and cleaning equipment provided in this application can mitigate these problems to some extent. The cleaning equipment provided in this application reduces the noise generated by the fan assembly during operation, thus minimizing its impact on users.

[0069] This application is described below with reference to the accompanying drawings and specific embodiments:

[0070] Please see Figure 1 and Figure 2 This application provides a cleaning device 10, which can reduce noise during operation and improve user experience.

[0071] In this embodiment of the application, the cleaning device 10 includes a main body 200, a fan assembly 100 installed on the main body 200, and a water tank 300. The water tank 300 is installed on the main body 200 and forms an air duct 410 between it and the main body 200. The air duct 410 is connected to the fan assembly 100. A sound-absorbing cavity 520 is provided in the air duct 410 to reduce noise.

[0072] The main body 200 is the main structure of the entire cleaning equipment 10. The main body 200 provides the installation foundation for structures such as the fan assembly 100 and the water tank 300. Structures such as the fan assembly 100 and the water tank 300 can be installed on the main body 200, so that the entire cleaning equipment 10 can form a whole and facilitate the use of the entire cleaning equipment 10.

[0073] The water tank 300 can be a sewage tank 300 or a clean water tank 300. That is, the sewage tank 300 and the main body 200 can form an air duct 410, the clean water tank 300 and the main body 200 can form an air duct 410, or both the sewage tank 300 and the clean water tank 300 can form an air duct 410 with the main body 200.

[0074] If both the wastewater tank 300 and the clean water tank 300 form an air duct 410 with the main body 200, the wastewater tank 300 and the clean water tank 300 can be arranged side by side, and the air duct 410 can be configured as a curved channel. Alternatively, the wastewater tank 300 and the clean water tank 300 can also be arranged vertically, that is, the wastewater tank 300 can be placed above or below the clean water tank 300, and the air duct 410 can be configured as a long strip or as a curved channel, without limitation.

[0075] In this embodiment, the fan assembly 100 provides suction force to the cleaning device 10 during the cleaning process, absorbing impurities and achieving the cleaning purpose. However, the fan assembly 100 generates significant noise during operation, which can diffuse to the outside with the airflow. Excessive noise can negatively impact the user experience. An air duct 410 is formed between the water tank 300 and the main body 200, increasing the flow path of the fan assembly 100's noise within the cleaning device 10, thus achieving a certain noise reduction effect. A silencer 500 is installed within the air duct 410; as the noise flows with the air, it passes through the silencer 500, further reducing noise diffusion to the outside and achieving a further noise reduction effect.

[0076] Since the air duct 410 is formed by the gap between the main body 200 and the water tank 300, placing the silencer 500 inside the air duct 410 can utilize the narrow space between the main body 200 and the water tank 300 for noise reduction, without occupying other space, and can reduce noise while minimizing the increase in the volume of the cleaning equipment 10.

[0077] Please see Figure 3 and Figure 4 In some embodiments, the water tank 300 is provided with baffles 510, which are in contact with the main body 200. The baffles 510, the main body 200 and the water tank 300 form an air duct 410 and a silencer 500.

[0078] After the baffle 510 comes into contact with the main body 200, a certain distance is created between the water tank 300 and the main body 200, that is, a certain gap is created between the water tank 300 and the main body 200. This gap is configured as an air duct 410. The air duct 410 and the silencer 500 are formed by utilizing the gap between the water tank 300 and the main body 200. The inherent structural design of the cleaning equipment 10 can be utilized without adding other structures, which can reduce noise and reduce volume at the same time.

[0079] In other words, the baffle 510 is set 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 set as the air duct 410. That is, the shape of the baffle 510 is the shape of the air duct 410. The air duct 410 can be a long strip air duct 410 or an air duct 410 formed by connecting multiple bent sub-segments. The specific shape of the air duct 410 is not limited in this application.

[0080] The volume of the water tank 300 is much smaller than that of the main body 200. The baffle 510 is set on the water tank 300. During installation, the sewage tank 300 can be installed in the corresponding installation position, so that the baffle 510 can contact the main body 200. This allows the internal cavity formed by the water tank 300, the main body 200 and the baffle 510 to form an air duct 410. At the same time, the baffle 510 can also directly form a silencer 500, eliminating the need for additional structures and reducing costs.

[0081] In some embodiments, the baffle 510 and the water tank 300 can be integrally formed. Due to the limited volume of the entire cleaning device 10, the gap between the water tank 300 and the main body 200 is small. By directly integrally forming the baffle 510 onto the water tank 300, the assembly process between the baffle 510 and the water tank 300 is reduced, and the sealing process between the baffle 510 and the water tank 300 is also reduced, thereby reducing costs.

[0082] Of course, in addition to this, the baffle 510 can also be set on the main body 200, that is, the baffle 510 is set at the corresponding installation position of the water tank 300. When the water tank 300 is installed on the main body 200, it can contact the water tank 300, and thus the baffle 510, the water tank 300 and the main body 200 can form a closed air duct 410.

[0083] As for the type of silencer 500, it can be designed as: expansion silencer 500, insertion tube silencer 500, perforated silencer 500, resonant silencer 500, quarter-wavelength tube, etc., or a combination thereof. This application does not limit the type of silencer 500, and several of them will be described in detail below.

[0084] The silencer 500 may include a silencer 520, which can be configured as a silencer cavity 520. The silencer cavity 520 is connected to the air duct 410. The depth direction of the silencer cavity 520 is set at an angle to the air outlet direction of the air duct 410, indicating that the depth direction of the silencer cavity 520 is different from the air outlet direction of the air duct 410. During the flow of noise with the airflow, when the noise reaches the silencer cavity 520, it enters the silencer cavity 520 and resonates within it, thus achieving the purpose of noise reduction. Alternatively, the noise may reflect off the bottom wall of the silencer cavity 520 and eventually return to the air duct 410, where it superimposes with the noise already present in the air duct 410, thus achieving the purpose of noise reduction. Alternatively, the noise energy may be weakened through perforations during its entry into the silencer cavity 520, thereby achieving the purpose of noise reduction.

[0085] The depth direction of the silencing cavity 520 is set at an angle to the air outlet direction of the air duct 410, and the angle range is (0°, 180°), specifically it can be 30°, 45°, 90°, 135°, 150°, etc.

[0086] In some embodiments, the silencing cavity 520 is connected to the air duct 410 through a connecting port 530, and the length of the connecting port 530 is less than the length of the silencing cavity 520 in the air outlet direction of the air duct 410.

[0087] The air duct 410 has a first air inlet 420 and a first air outlet 430. The first air inlet 420 is connected to the second air outlet 114 of the fan assembly 100. The air outlet direction of the air duct 410 is from the first air inlet 420 to the first air outlet 430. Under the action of the fan assembly 100, the airflow flows 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 connecting opening 530 is less than the length of the silencing cavity 520, but the length of the silencing cavity 520 can be much greater than the length of the connecting opening 530. That is, the connecting opening 530 is a narrow hole, and the entire silencing cavity 520 can be considered as a roughly closed cavity.

[0088] When noise enters the silencing cavity 520 through the connecting port 530, the air inside the silencing cavity 520 is excited by the sound waves and vibrates back and forth like a piston, converting sound energy into heat energy and dissipating it, thereby achieving the purpose of noise reduction.

[0089] Because the silencing cavity 520 is relatively long in the air outlet direction of the air duct 410, the vibration space of the air inside the silencing cavity 520 is larger, which allows for the conversion of most of the sound energy into heat energy for dissipation, thereby improving the silencing effect. In other words, the basic principle of resonance is that after the sound wave enters the silencing cavity 520, it undergoes multiple reflections within the silencing cavity 520. The purpose of silencing is achieved through wave superposition and interference. When the sound wave produces a 180-degree phase difference after reflection, the silencing effect after superposition is optimal. Therefore, the depth of the silencing cavity 520 can be set according to the frequency of the noise.

[0090] During the operation of the fan assembly 100, since the structure of the fan assembly 100 is already determined and the working environment is basically determined, the frequency of the noise generated by the fan assembly 100 is basically determined, so the depth of the silencing cavity 520 can be set according to the frequency of the noise.

[0091] In this case, it can be considered that noise reduction is achieved through resonance, and this structure can be considered to be the implementation of the principle of resonance silencer 500.

[0092] In some embodiments, the length of the silencing cavity 520 in the air outlet direction of the air duct 410 is the same as the length of the connecting port 530 in the air outlet direction of the air duct 410. That is, after noise enters the silencing cavity 520, it flows to the bottom wall of the silencing cavity 520 and is reflected by the bottom wall before entering the air duct 410. There, it superimposes with the noise in the air duct 410 and causes interference, thereby achieving the purpose of noise reduction. In this case, the silencing cavity 520 uses the principle of a quarter-wavelength tube for noise reduction.

[0093] Please see Figure 5 and Figure 6 In some embodiments, there are multiple connection ports 530, and the multiple connection ports 530 are arranged sequentially along the air outlet direction of the air duct 410.

[0094] Multiple connecting ports 530 are arranged sequentially at intervals along the air outlet direction of the air duct 410. The interval between two adjacent connecting ports 530 can be the same or different. The specific interval can also be set according to the length of the silencing cavity 520 in the air outlet direction of the air duct 410. The number of connecting ports 530 is not specifically limited.

[0095] Multiple connecting ports 530 are arranged sequentially along the air outlet direction of the air duct 410. As noise flows with the airflow towards the first air outlet 430, it can enter the silencing cavity 520 through different connecting ports 530, so that the noise can basically enter the silencing cavity 520 for silencing, thereby improving the silencing effect of the silencing cavity 520.

[0096] When noise enters the silencing cavity 520 through the connecting port 530, the gas will rub against the inner wall of the connecting port 530 during the process of passing through the connecting port 530 due to the difference in impedance between the connecting port 530 and the air duct 410. This causes the gas to vibrate, meaning that the noise will vibrate during the contact with the connecting port 530, thereby converting sound energy into heat, thus achieving the purpose of damping and silencing.

[0097] Please see Figure 7 and Figure 8 In some embodiments, there are multiple silencing cavities 520, which are arranged sequentially at intervals along the air outlet direction of the air duct 410.

[0098] The extension directions of the multiple silencing chambers 520 can be the same or different, depending on the position between the water tank 300 and the main body 200. The spacing between two adjacent silencing chambers 520 can be the same or different, depending on the position between the water tank 300 and the main body 200.

[0099] Similarly, the shapes of the multiple silencing cavities 520 can be the same or different. The shapes of the multiple silencing cavities 520 can all be the same, or the shapes of the multiple silencing cavities 520 can all be different. Some of the silencing cavities 520 can also have the same shape, while some of the silencing cavities 520 have different shapes.

[0100] In addition, regarding the length of the multiple silencing cavities 520, similarly, the multiple silencing cavities 520 can be of the same length, or the multiple silencing cavities 520 can be of different lengths, or some of the silencing cavities 520 can be of the same length and some of the silencing cavities 520 can be of different lengths.

[0101] In some embodiments, the depths of any two anechoic cavities 520 may be the same or different.

[0102] Any two silencing cavities 520 may have the same or different depths. Multiple silencing cavities 520 may have the same depth, or all silencing cavities 520 may have different depths. Alternatively, some silencing cavities 520 may have the same depth, while others may have different depths. In other words, multiple silencing cavities 520 may have different depths.

[0103] During the 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. The multiple silencing chambers 520 are set with different depths to correspond to multiple frequencies in the noise, which can weaken multiple frequencies of noise and improve the silencing effect.

[0104] In some embodiments, the depth of the silencing cavity 520 is set according to the following formula:

[0105] f = (c / l 1)(2n+1) / 4;

[0106] Where f is the frequency of the noise, c is the speed of sound of the noise, l1 is the depth of the silencing cavity 520, and n is zero or a positive integer.

[0107] Based on the above formula transformation, we can obtain f = (c / l 1)(2n+1) / 4; where the sound speed of the noise divided by the frequency of the noise equals the wavelength of the noise, and n is 0 or a positive integer. That is, the length of the silencing cavity 520 is an odd multiple of a quarter wavelength of the noise. Therefore, the depth of the silencing cavity 520 can be considered to be related to a quarter wavelength of the noise. Thus, the silencing cavity 520 can be considered to be a quarter wavelength tube. When the noise in the receiving cavity 112 enters the silencing cavity 520, it is reflected by the silencing cavity 520 and then propagates again to the connection between the silencing cavity 520 and the air duct 410. The running length of this noise is exactly half a wavelength, and there is a 180-degree phase difference between it and the noise in the air duct 410. They 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.

[0108] In other words, in some embodiments, the depth of the silencing cavity 520 is set to an odd multiple of a quarter wavelength of the noise, so that the noise reflected by the silencing cavity 520 has a 180-degree phase difference with the noise in the air duct 410. The two can interfere with each other after being superimposed, thereby achieving the purpose of noise reduction.

[0109] In some embodiments, silencing cavities 520 are provided on both sides of the air duct 410. Providing silencing cavities 520 on both sides can improve efficiency.

[0110] Please see Figure 9 and Figure 10 In some embodiments, the projection of the first air outlet 430 onto the air outlet direction of the air duct 410 is located within the projection of the air duct 410 along the air outlet direction. This indicates that the opening 115b of the first air outlet 430 has a small area. When noise flows with the airflow to the first air outlet 430, because the impedance at the first air outlet 430 is different from the impedance inside the air duct 410, some of the noise will be reflected in the opposite direction of the air outlet direction under the action of the inner wall, and thus superimposed and interfered with the noise inside the air duct 410, achieving a noise reduction effect.

[0111] The first air outlet 430 has multiple outlets, and the multiple outlets 430 are arranged opposite to the first air inlet 420. This allows noise in the air duct 410 to be reflected in the opposite direction of the air outlet under the action of different outlets 430, so that as little noise as possible is extended from the outlet 430 to the outside of the air duct 410, which can also play a certain role in noise reduction.

[0112] Specifically, there can be two first air outlets 430, which are located on both sides of the central axis of the air duct 410, so that the two first air outlets 430 can be set in different positions in the air duct, which can also play a certain role in noise reduction while exhausting air.

[0113] In some embodiments, the air duct 410 has a first air section 412 and a second air section 413, wherein the width of the first air section 412 is smaller than the width of the second air section 413.

[0114] The widths of the first air section 412 and the second air section 413 refer to their widths in the direction perpendicular to the air outlet direction. The first air section 412 is connected to the first air inlet 420, and the second air section 413 is connected to the first air outlet 430. When noise enters the second air section 413 from the first air section 412, the increased width allows the noise to diffuse within the second air section 413, enabling the noise to diffuse in different directions. After being reflected by the inner wall of the air duct 410, the noise can be superimposed and interfered, which can also play a certain role in noise reduction.

[0115] In some embodiments, a portion of the first air section 412 is located outside the second air section 413, while a portion of the first air section 412 is located inside the second air section 413. Since the first air section 412 is connected to the first air inlet 420 and the second air section 413 is connected to the first air outlet 430, the airflow direction of the 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 fact that a portion of the first air section 412 is located inside the second air section 413 can guide the airflow from the first air section 412 to the second air section 413, allowing the airflow to enter the second air section 413 smoothly. This reduces noise generated by turbulence during airflow and can also improve the noise reduction effect to a certain extent.

[0116] 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. This allows noise to diffuse within the air duct 410 as it moves from the narrower part to the wider part. The noise can diffuse in different directions and, after being reflected by the inner wall of the air duct 410, can superimpose and interfere, thus achieving a certain degree of noise reduction.

[0117] In some embodiments, the silencer 500 can also be directly disposed at the first air outlet 430 or the first air inlet 420. In addition to setting the silencer cavity 520 in the air duct 410 by means of the baffle 510, the silencer 500 can also be directly disposed at the first air outlet 430 or the first air inlet 420. The purpose of noise reduction can also be achieved by setting an external silencer 500.

[0118] Of course, in addition to this, the external silencer 500 can also be installed inside the air duct 410.

[0119] Please see Figure 11 and Figure 12 In this embodiment of the application, the fan assembly 100 includes: a housing 110 and a fan wheel 120. The housing 110 has a receiving cavity 112 and a second air inlet 113 and a second air outlet 114 communicating with the receiving cavity 112. The fan wheel 120 is disposed in the receiving cavity 112. The housing 110 is provided with a noise reduction cavity 115 communicating with the receiving cavity 112. 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 set at an angle to the air outlet direction of the second air outlet 114 to reduce the noise of the second air outlet 114.

[0120] The housing 110 is the main body of the entire fan assembly 100. The housing 110 provides the mounting base for the impeller 120 and other structures of the fan assembly 100. The impeller 120 and other components can be installed in the housing 112, which can play a certain protective role for the impeller 120 and other structures of the fan assembly 100, and reduce damage to the impeller 120 and other structures by external dust, particles and other impurities.

[0121] Both the second air inlet 113 and the second air outlet 114 are connected to the receiving cavity 112. During the operation of the impeller 120, external air enters the receiving cavity 112 from the second air inlet 113 and is discharged from the second air outlet 114, forming an air duct for air flow in the area between the second air inlet 113 and the second air outlet 114. Since the impeller 120 generates noise during operation, the air flow or the operation of the impeller 120 will also diffuse to the outside from the second air outlet 114, resulting in loud noise during the operation of the cleaning equipment, which affects the user's experience.

[0122] In this embodiment, a noise reduction cavity 115 is provided between the impeller 120 and the second air outlet 114. The depth direction of the noise reduction cavity 115 is set at an angle to the air outlet direction of the second air outlet 114, that is, the depth direction of the noise reduction cavity 115 is set at an angle to the direction of the air duct in the receiving cavity 112. When noise propagates to the receiving cavity 112, it will diffuse into the receiving cavity 112 and move to the bottom wall 115a of the noise reduction cavity 115 before being reflected. Finally, it returns to the air duct and superimposes 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 a certain extent.

[0123] 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 noise reflected from the noise reduction cavity 115 is in opposite half-waves to the phase of the noise in the noise reduction cavity 115 in the air duct, the noise reflected from the cavity and the noise in the air duct can be superimposed to reduce the volume of the noise at the second air outlet 114 to a certain extent.

[0124] The angle between the depth direction of the noise reduction cavity 115 and the air outlet direction of the second air outlet 114 is in the range of (0°-180°), specifically it can be 30°, 45°, 90°, 135°, 150°, etc.

[0125] 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 wall at the bottom of the noise reduction cavity 115 when the fan assembly 100 is in operation.

[0126] Since the model of the impeller 120, the size of the housing 110, the installation position of the impeller 120 in the housing 110, and the models and installation positions of other parts of the fan assembly 100 on the housing 110 are all determined at the time of manufacture, the frequency of the noise of the fan assembly 100 during operation is also roughly determined. Therefore, the depth of the noise reduction cavity 115 can be set according to the frequency of the noise, thereby reducing the volume of the noise flowing out from the second air outlet 114.

[0127] In some embodiments, the depth of the noise reduction cavity 115 is set according to the following formula:

[0128] f = (c / l²)(2n+1) / 4;

[0129] Where f is the frequency of the noise, c is the speed of sound of the noise, l2 is the depth of the noise reduction cavity 115, and n is zero or a positive integer.

[0130] Based on the above formula transformation, we can obtain l2=(c / f)(2n+1) / 4; where the sound speed of the noise divided by the frequency of the noise equals the wavelength of the noise, and n is 0 or a positive integer, that is, the length of the noise reduction cavity 115 is an odd multiple of a quarter wavelength of the noise. Therefore, the depth of the noise reduction cavity 115 can be considered to be related to a quarter wavelength of the noise, and the noise reduction cavity 115 can be considered to be a quarter wavelength tube. When the noise in the receiving cavity 112 enters the noise reduction cavity 115, it is reflected by the noise reduction cavity 115 and then propagates again to the connection between the noise reduction cavity 115 and the receiving cavity 112. The running length of the noise is exactly half a wavelength, and there is a 180-degree phase difference between it and the noise in the receiving cavity 112. They 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.

[0131] In other words, in some embodiments, the depth of the noise reduction cavity 115 is set to an odd multiple of a quarter 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 receiving cavity 112. The two can interfere with each other after being superimposed, thereby achieving the purpose of noise reduction.

[0132] like Figure 13 As shown, the horizontal axis represents the frequency of the noise, and the vertical axis represents the volume of the noise. Figure 13 As can be seen, the frequency of the noise is not a single point value, but a frequency band, and the depth of the noise reduction cavity 115 at this frequency corresponds to the frequency setting at point A in the diagram. Figure 13 The "central state" refers to the noise volume without the noise reduction cavity 115. Adding the noise reduction cavity 115 means that after the noise reduction cavity 115 is installed inside the housing 110, the noise volume, as shown at point B, is reduced compared to point A. Figure 13 It can be seen that after setting the noise reduction cavity 115, the volume of the corresponding frequency can be reduced adaptively, which can improve the user experience.

[0133] It should be noted that, during the operation of the fan assembly 100, the noise frequency is often not a single point value but a frequency band. Within this frequency band, there may be several specific frequencies that are particularly high or loud. When setting the depth of the noise reduction cavity 115, it can be set according to the wavelength of the specific noise frequencies, thus eliminating the noise at those specific frequencies. Alternatively, the noise reduction cavity 115 can be configured as a variable noise reduction cavity, so that its depth corresponds to the frequencies of all noise within the frequency band, thereby reducing the noise generated by the fan assembly 100 during operation and improving the user experience.

[0134] In some embodiments, the second air inlet 113 and the second air outlet 114 are respectively disposed at both ends of the housing 110, and the noise reduction cavity 115 is disposed on the side wall of the housing 110, with the depth of the noise reduction cavity 115 perpendicular to the air outlet direction of the second air outlet 114.

[0135] The housing 110 is generally elongated, with the two ends referring to the two ends along its length, and the sidewalls referring to all walls except the two ends. The second air inlet 113 and the second air outlet 114 are located at the two ends of the housing 110, respectively. The elongated airflow within the housing 110 allows for better gas collection, increasing the gas flow rate within the fan assembly 100 and thus improving the working efficiency of the fan assembly 100.

[0136] The noise reduction cavity 115 is disposed on the side wall of the housing 110 and extends away from the receiving cavity 112. The direction of noise movement in the noise reduction cavity 115 is set at an angle to the direction of movement in the housing 110. That is, the direction of noise movement in the housing 110 is different from the direction of movement in the noise reduction cavity 115. This allows the noise to overlap with the noise in the housing 110 after being reflected by the noise reduction cavity 115, thereby interfering with each other and weakening the noise to improve the user experience.

[0137] Specifically, the depth direction of the noise reduction cavity 115 is perpendicular to the air outlet direction of the second air outlet 114. When noise moves from inside the housing 110 to the noise reduction cavity 115, the movement path in the noise reduction cavity 115 is the shortest, allowing the noise to quickly return to the receiving cavity 112 and overlap with the noise inside the housing 110, thus interfering with each other and weakening the noise to improve the user experience.

[0138] In some embodiments, there are multiple noise reduction cavities 115, which are spaced apart.

[0139] The extension directions of the multiple noise reduction cavities 115 can be the same or different, and can be set according to the space inside the accommodating cavity 112, the arrangement position of the impeller 120, the relative position between the second air outlet 114 and the impeller 120, etc.

[0140] The spacing between two adjacent noise reduction cavities 115 can be the same or different, depending on the layout structure of the entire fan assembly 100.

[0141] Similarly, the shapes of the multiple noise reduction cavities 115 can be the same or different. The shapes of the multiple noise reduction cavities 115 can all be the same, or the shapes of the multiple noise reduction cavities 115 can all be different. Some of the noise reduction cavities 115 can have the same shape, while some of the noise reduction cavities 115 have different shapes.

[0142] In addition, regarding the length of the multiple noise reduction cavities 115, similarly, the multiple noise reduction cavities 115 can have the same length, or the multiple noise reduction cavities 115 can have different lengths, or some of the noise reduction cavities 115 can have the same length and some of the noise reduction cavities 115 can have different lengths.

[0143] In some embodiments, the depth of the noise reduction cavity 115 is the same in the direction from the second air inlet 113 to the second air outlet 114.

[0144] The direction from the second air inlet 113 to the second air outlet 114 refers to the direction of gas flow inside the housing 110. If the depth of the noise reduction cavity 115 is the same in the airflow direction, it means that the noise reduction cavity 115 can only reduce noise of one frequency. As for which frequency of noise the depth of the noise reduction cavity 115 corresponds to, it can be the noise with the highest frequency in the noise frequency band, or it can be the frequency of the noise with the highest volume.

[0145] The noise reduction cavities 115 have the same depth. This can mean that all positions of the same noise reduction cavity 115 have the same depth, or that multiple noise reduction cavities 115 have the same depth.

[0146] In some embodiments, the depth of the noise reduction cavity 115 decreases sequentially in the direction from the second air inlet 113 toward the second air outlet 114.

[0147] The depth of the noise reduction cavity 115 decreases sequentially from the second air inlet 113 toward the second air outlet 114. As the depth of the noise reduction cavity 115 changes, the frequency of the corresponding noise also changes. This allows the noise reduction cavity 115 to reduce frequencies that cover the entire frequency band of noise generated by the fan assembly 100 during operation, thereby reducing noise across the entire frequency band and decreasing the noise volume at the second air outlet 114, thus improving the user experience.

[0148] The decreasing depth of the noise reduction cavity 115 can mean that the depth of the same silencing cavity gradually decreases in the direction from the second air inlet 113 to the second air outlet 114, or it can mean that among multiple noise reduction cavities 115, the depth of multiple noise reduction cavities 115 decreases 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 a single noise reduction cavity 115 can be the same everywhere, or the depth can decrease in the direction from the second air inlet 113 to the second air outlet 114.

[0149] In some other embodiments, at least two noise reduction cavities 115 have different depths in the direction from the second air inlet 113 to the second air outlet 114.

[0150] The depth of the noise reduction cavity 115 is related to a quarter wavelength of the noise. One depth of the noise reduction cavity 115 can reduce noise at one frequency. If the depth of the noise reduction cavity 115 is different in at least two places, it means that it can reduce noise at at least two frequencies.

[0151] Throughout the entire noise frequency band, there may be several noises with relatively high volume or frequency. 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 a quarter wavelength of the noise with the highest volume, or an odd multiple of a quarter wavelength of the noise with the highest frequency, or it can be set according to actual needs.

[0152] In some embodiments, the noise reduction cavity 115 has an opening 115b communicating with the receiving cavity 112, and along the depth direction of the noise reduction cavity 115, the projected area of ​​the noise reduction cavity 115 at the opening 115b is less than or equal to the cross-sectional area of ​​the receiving cavity 112 at the opening 115b.

[0153] 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 side wall of the housing 110, while the cross-sectional area of ​​the receiving cavity 112 at the opening 115b refers to the cross-sectional area of ​​the portion of the receiving cavity 112 at the opening 115b in a plane perpendicular to the air outlet direction. The fact that the projected area of ​​the noise reduction cavity 115 at the opening 115b is less than or equal to the cross-sectional area of ​​the receiving 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 be infinitely close to the cross-sectional area of ​​the receiving cavity 112 at the opening 115b.

[0154] The volume reduction effect of 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 receiving 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 receiving cavity 112 at the opening 115b, the noise reduction cavity 115 can basically eliminate the noise of the corresponding frequency. The closer the projected area of ​​the noise reduction cavity 115 at the opening 115b is to the cross-sectional area of ​​the receiving cavity 112 at the opening 115b, the better the noise reduction effect.

[0155] In some embodiments, along the depth direction of the noise reduction cavity 115, the ratio of the projected area of ​​the noise reduction cavity 115 at the opening 115b to the cross-sectional area of ​​the receiving cavity 112 at the opening 115b is [0.8-1]. Therefore, it can be considered that the projected area of ​​the noise reduction cavity 115 at the opening 115b is equal to or can be infinitely close to the cross-sectional area of ​​the receiving cavity 112 at the opening 115b. In this case, the noise reduction effect of the noise reduction cavity is better.

[0156] The shape of the noise reduction cavity 115 is not specifically limited; it can be a cuboid, a sphere, or an irregular shape. Similarly, the length of the noise reduction cavity 115 is also not specifically limited and can be set according to the space inside the accommodating cavity 112, the distance and relative position between the second air outlet 114 and the impeller 120.

[0157] For example, when the noise reduction cavity 115 is elongated, its length can be arranged along the direction of the impeller 120 near the second air outlet 114, or its width can be arranged along the direction of the impeller 120 near the second air outlet 114. Alternatively, the length of the noise reduction cavity 115 can be arranged at an angle to the direction of the impeller 120 near the second air outlet 114.

[0158] In some embodiments, the depths of any two noise reduction cavities 115 may be the same or different.

[0159] Any two noise reduction cavities 115 may have the same or different depths. Multiple noise reduction cavities 115 may have the same depth, or all noise reduction cavities 115 may have different depths, or some noise reduction cavities 115 may have the same depth and some may have different depths. That is, multiple noise reduction cavities 115 may have different depths.

[0160] During the 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. The multiple noise reduction cavities 115 are set with different depths to correspond to multiple frequencies in the noise, which can weaken multiple frequencies of noise and improve the noise reduction effect.

[0161] As described above, along the depth direction of the noise reduction cavity 115, the projected area of ​​the noise reduction cavity 115 at the opening 115b is less than or equal to the cross-sectional area of ​​the receiving cavity 112 at the opening 115b. When there are multiple noise reduction cavities 115, and the depths of the multiple noise reduction cavities 115 are the same, the sum of the projected areas of the multiple noise reduction cavities 115 at the opening 115b can be less than or equal to the cross-sectional area of ​​the receiving cavity 112 at the opening 115b.

[0162] In some embodiments, in the direction from the second air inlet 113 to the second air outlet 114, a plurality of noise reduction cavities 115 are arranged sequentially at intervals (e.g., Figure 11 and Figure 12 (as shown) or arranged side by side (such as) Figure 14 and Figure 15 (As shown).

[0163] Since the noise reduction cavity 115 is located between the impeller 120 and the second air outlet 114, in the direction from the second air inlet 113 to the second air outlet 114, which is also the direction from the impeller 120 to the second air outlet 114, the multiple noise reduction cavities 115 are arranged alternately in sequence, which means that the multiple noise reduction cavities 115 are arranged overlappingly in sequence in the direction from the second air inlet 113 to the second air outlet 114. The multiple noise reduction cavities 115 are arranged side by side, which means that the extension direction of the multiple noise reduction cavities 115 is the same as the direction from the second air inlet 113 to the second air outlet 114.

[0164] For example, when the noise reduction cavity 115 is elongated, multiple noise reduction cavities 115 arranged sequentially at intervals means that the width direction of multiple noise reduction cavities 115 is along the direction from the second air inlet 113 to the second air outlet 114, and they are arranged overlappingly. Multiple noise reduction cavities 115 arranged side by side means that the length direction of the noise reduction cavities 115 is along the direction from the second air inlet 113 to the second air outlet 114.

[0165] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0166] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0167] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A cleaning apparatus, characterized by, The application relates to a 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) has a first air section (412) connected with the first air inlet (420) and a second air section (413) connected with the first air outlet (430), the width of the first air section (412) being smaller than that of the second air section (413). The air duct (410) is provided with a silencer (500) to reduce noise. The silencer (500) comprises a silencing cavity (520) arranged at an angle with the air outlet direction of the air duct (410). The silencing cavity (520) is in communication with the air duct (410) through a communication port (530), and the length of the communication port (530) is smaller than that of the silencing cavity (520) in the air outlet direction of the air duct (410).

2. The cleaning apparatus of claim 1, 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).

3. The cleaning apparatus of claim 2, wherein, One of the silencing cavities (520) has a plurality of communication ports (530).

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

5. The cleaning apparatus of claim 4, wherein, The silencing cavities (520) are a plurality of silencing cavities (520) arranged in sequence along the air outlet direction of the air duct (410).

6. The cleaning apparatus of claim 4, wherein, The depths of the plurality of silencing cavities (520) are the same or different.

7. The cleaning apparatus of claim 4, wherein, The depth of the silencing cavity (520) is related to the frequency of the noise in the air duct (410).

8. The cleaning apparatus of claim 3, wherein, The depth of the silencing cavity (520) is set according to the following formula:

9. The cleaning apparatus of claim 8, wherein, Wherein f is the frequency of the noise, c is the speed of sound, l1 is the depth of the silencing cavity (520), and n is a positive integer.

10. The cleaning apparatus of claim 3, wherein, The air duct (410) is provided with the silencing cavities (520) on both sides.

11. The cleaning apparatus of claim 10, wherein, The silencer (500) is also arranged at the first air outlet (430) or the first air inlet (420). ； The projection of the first air outlet (430) in the air outlet direction of the air duct (410) is located in the projection of the air duct (410) in the air outlet direction of the air duct (410).

12. The cleaning apparatus of claim 3, wherein, The impedance of the first air outlet (430) is different from that of the air duct (410).

13. The cleaning apparatus of claim 2, wherein, The first air outlet (430) has a plurality of first air outlets (430).

14. The cleaning apparatus of claim 2, 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).

15. The cleaning apparatus of claim 14, 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.

16. The cleaning apparatus of claim 14, wherein, ​ 17. The cleaning apparatus of claim 14, wherein, ​ 18. The cleaning apparatus of claim 14, wherein, ​ 19. The cleaning apparatus of claim 14, 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).

20. The cleaning apparatus of any one of claims 1-19, wherein, The air duct (410) is a bent channel.

21. The cleaning apparatus of any one of claims 2-19, 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 (10) comprises a baffle (510), and the baffle (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 baffle (510) is arranged on the main body (200) or the water tank (300).

25. The cleaning apparatus of any one of claims 1-19, 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. The second air inlet (113) comprises a plurality of second air inlets (113) arranged in a ring shape on the housing (110).

27. The cleaning apparatus of claim 25, wherein, 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).

28. The cleaning apparatus of claim 26, 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).

29. The cleaning apparatus of claim 26, wherein, The noise reduction cavity (115) comprises a plurality of noise reduction cavities (115) arranged at intervals.

30. The cleaning apparatus of claim 26, wherein, The cleaning device comprises a base station and the cleaning device of any one of claims 1-30.

31. A cleaning system characterized by, ​

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