Motor assembly, cleaning device, scrubber and robot

Abstract

The application provides a motor assembly, a cleaning device, a floor cleaning machine and a robot. The motor assembly comprises a first shell, a sound insulation and ventilation component arranged in the first shell and separating the space in the first shell into an inner cavity and an outer cavity, and a motor arranged in the inner cavity. The outer cavity serves as an air outlet channel surrounding the outer periphery of the motor. The outer cavity has an air outlet, and the air inlet of the motor and the air outlet are located on the same end side of the sound insulation and ventilation component. When the motor is working, air flows into the motor through the air inlet, and the air flow of the motor passes through the sound insulation and ventilation component into the air outlet channel and is discharged through the air outlet. The air flow in the air outlet channel and around the outer periphery of the motor hinders the outward propagation of the noise of the motor and changes the frequency of the noise, thereby achieving the purpose of noise reduction.

Description

Technical Field

[0001] This application relates to the field of electrical equipment, and more particularly to a motor assembly, cleaning equipment, floor scrubber, and robot. Background Technology

[0002] Currently, cleaning appliances such as vacuum cleaners, robot vacuums, floor scrubbers, and handheld vacuums all use motors as a power source to generate suction airflow and use the suction airflow to clean dust, liquids, mites, etc. on the surfaces to be cleaned, such as floors and beds.

[0003] When users use these devices, the motor operation is subject to mechanical vibration, airflow disturbances, and other factors, resulting in relatively high noise levels and reduced user comfort. Summary of the Invention

[0004] In view of the above problems, this application is made to solve or at least partially solve the above problems, including an electric motor assembly, cleaning equipment, floor scrubber, and robot.

[0005] This application provides a motor assembly, including:

[0006] First shell;

[0007] A breathable and sound-insulating component is installed inside the first housing, dividing the space inside the first housing into an inner cavity and an outer cavity;

[0008] The motor is located within the inner cavity;

[0009] The outer cavity serves as an air outlet channel surrounding the motor, and the outer cavity has an air outlet. The air outlet and the air inlet of the motor are located on the same end side of the breathable and sound-insulating component.

[0010] When the motor is working, airflow enters the motor through the air inlet, and the exhaust airflow from the motor enters the air outlet channel through the breathable and sound-insulating component and is discharged through the air outlet.

[0011] This application also provides a cleaning device, including a device body, a motor assembly and a cleaning device as described in the above embodiments; wherein, the motor assembly is disposed on the device body and is used to generate a suction airflow. The cleaning device is disposed on the device body and uses the suction airflow to clean the object to be cleaned.

[0012] In practice, the cleaning equipment may include, but is not limited to: robotic vacuum cleaners, handheld vacuum cleaners, floor scrubbers, robotic vacuum and mop combos, etc.

[0013] Another embodiment of this application provides a floor scrubbing machine. The floor scrubbing machine includes a main body, a motor assembly provided in the above embodiment, and a cleaning device. The motor assembly is disposed on the main body and is used to generate a suction airflow. The cleaning device is disposed on the main body and uses the suction airflow to clean the object being cleaned.

[0014] In other embodiments, the motor device provided in this application can also be used on a robot. The robot can be any service robot, such as a sewage recycling robot, a sweeping robot, an air purifying robot, etc., and this embodiment does not specifically limit it. The robot includes a robot body and the motor assembly provided in the above embodiments. The motor assembly is disposed on the robot body and is used to generate suction airflow.

[0015] In the technical solution of this application embodiment, a breathable and sound-insulating component is provided inside the first housing to divide the space inside the first housing into an inner cavity and an outer cavity, with the motor located inside the inner cavity. The outer cavity, which serves as an air outlet channel surrounding the motor, has an air outlet, and the air outlet and the air inlet of the motor are located on the same side. In this way, the airflow generated by the motor enters the air outlet channel through the breathable and sound-insulating component. Because the air outlet and the air inlet are on the same side, the airflow is contained within the air outlet channel and surrounds the outer periphery of the motor, forming a "wind wall" that prevents the motor noise from spreading outward and isolates the noise within the "wind wall". In addition, the airflow disturbance surrounding the outside of the motor in the air outlet channel will also cause the frequency of the noise to change, thereby achieving the purpose of noise reduction. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0017] Figure 1 This is a schematic cross-sectional view of a motor assembly provided in an embodiment of this application;

[0018] Figure 2 This is an exploded view of a motor assembly provided in an embodiment of this application;

[0019] Figure 3 This is a three-dimensional structural diagram of a breathable and sound-insulating component provided in an embodiment of this application;

[0020] Figure 4 This is a three-dimensional structural diagram of a breathable and sound-insulating component and a motor cover front cover provided in an embodiment of this application;

[0021] Figure 5 A three-dimensional structural diagram of a breathable and sound-insulating component and a first housing provided in an embodiment of this application;

[0022] Figure 6 This is a schematic diagram of a floor scrubbing machine provided in one embodiment of this application. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. The term "comprising" as used throughout the specification and claims is an open-ended term and should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain error range. Furthermore, in the embodiments of this application, "multiple" refers to two or more. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0024] Currently, many cleaning devices rely on motors to perform certain functions. For example, the suction module in a vacuum cleaner or cleaning equipment uses a motor to generate negative pressure, thus achieving the suction function. However, motors generate noise during operation. This noise is mainly divided into two types: mechanical vibration noise and aerodynamic noise generated by airflow. In terms of noise classification, mechanical vibration noise has a relatively low frequency and is classified as low-frequency noise, while aerodynamic noise has a relatively high frequency and is classified as high-frequency noise. Both high-frequency and low-frequency noise require a transmission medium (gas, liquid, or solid) to propagate. Sound waves are transmitted or diffused through liquids or solids, which can be understood as system resonance. During sound wave propagation, the vibration frequency is affected by the natural frequency of the propagation medium. When the frequency of the sound wave is the same as the natural frequency of the propagation medium, the amplitude of the propagation medium reaches its maximum, and the sound propagation efficiency is also the highest. The natural frequency of the propagation medium is mainly determined by two important parameters: mass and stiffness. With a given stiffness, a larger mass results in a lower natural frequency.

[0025] Based on the above principles, this application proposes a motor assembly to solve the noise problem of motors during operation.

[0026] It should be noted that the motor assembly provided in this application is suitable for cleaning equipment that uses a motor to draw in airflow and uses the negative pressure generated by the airflow to clean and collect debris, such as vacuum cleaners, floor scrubbers, and cleaning robots. In addition, this motor assembly can also be adapted to some devices that output airflow through motor operation, such as air purifiers and hair dryers.

[0027] Figure 1 This is a schematic cross-sectional view of a motor assembly provided in one embodiment of this application. Figure 2 This is an exploded structural diagram of a motor assembly provided in one embodiment of this application. See also... Figure 1 and Figure 2 , Figure 1 The direction of the arrow indicates the airflow direction when motor 1 is working, and the arc indicates the direction of sound wave propagation and diffusion. In one embodiment of this application, the motor assembly includes: a first housing 2, a breathable sound-insulating component 3, and a motor 1. The breathable sound-insulating component 3 is disposed within the first housing 2, dividing the space within the first housing 2 into an inner cavity 211 and an outer cavity 212. The motor 1 is located within the inner cavity 211. The outer cavity 212 serves as an air outlet channel surrounding the motor 1, and has an air outlet 2120. The air outlet 2120 and the air inlet 13 of the motor are located on the same end side of the breathable sound-insulating component. When the motor is working, airflow enters the motor 1 through the air inlet 13, and the exhaust airflow from the motor 1 passes through the breathable sound-insulating component 3 into the air outlet channel, and is discharged through the air outlet 2120 on the same end side of the breathable sound-insulating component.

[0028] The propagation of sound waves is the propagation of vibrational energy. Vibration pushes the surrounding air, forming invisible waves and spreading shapes. In low-speed or still air, the wave propagation is minimally affected and can maintain its original state. However, at higher airflow speeds, the wave surface cannot maintain its original propagation shape. The ripples shift and disperse in space, deforming with the airflow direction, with greater deformation at higher speeds. Based on this principle, this application proposes a method to reduce noise by forming a "wind wall." Specifically, in the technical solution of this embodiment, the airflow generated by the motor 1 enters the air outlet channel through the breathable sound insulation component 3. Because the air outlet 2120 of the air outlet channel and the air inlet of the motor 1 are located on the same side, the airflow surrounds the motor 1 within the air outlet channel, forming a "wind wall." The rapidly flowing airflow breaks the original relatively calm airflow path of noise propagation, hindering the outward propagation of motor noise and isolating the noise within the "wind wall." In addition, the airflow disturbance surrounding the motor within the air outlet channel also changes the frequency of the noise, thereby achieving the purpose of noise reduction.

[0029] In one feasible embodiment, such as Figure 1As shown, the first housing 2 can be a thin-walled structure open at one end. The motor 1 is disposed within the cavity of the first housing 2, and an inner cavity structure 21 exists between the motor 1 and the first housing 2. A breathable and sound-insulating component 3 is disposed within the inner cavity structure 21, surrounding the outside of the motor 1, dividing the inner cavity structure 21 into an inner cavity 211 and an outer cavity 212. Figure 1 As shown, the breathable sound insulation component 3 can be a sleeve structure with open ends. The first housing 2 may include a bottom wall and side walls, with the bottom wall and side walls forming a cylindrical housing. One end of the breathable sound insulation component 3 can be connected to the bottom wall of the first housing 2; the space between the breathable sound insulation component 3 and the side wall of the first housing 2 is the outer cavity 212; the space between the breathable sound insulation component 3 and the motor is the inner cavity 211.

[0030] In one embodiment provided in this application, one or more breathable sound insulation components 3 can be provided. When multiple breathable sound insulation components 3 are provided, multiple breathable sound insulation components 3 can be nested together. For example, one or more breathable sound insulation components 3 with slightly larger structural dimensions can be nested outside one breathable sound insulation component 3, and then all the breathable sound insulation components 3 are set in the inner cavity structure 21 to form a multi-layer sound insulation cavity on the outside of the motor.

[0031] In one embodiment provided in this application, the first end 11 of the motor 1 is connected to the bottom of the cavity. Specifically, a through hole 20 is provided on the bottom wall of the first housing 2, and the through hole is adapted to the first end 11 of the motor 1. The first end of the motor 1 has a hollow structure, which is used to lead out the wiring of the motor 1.

[0032] For example, in one specific embodiment, such as Figure 1 and Figure 3 As shown, the air outlet of the air outlet channel (i.e., the outer cavity 212) is an annular air outlet; the annular air outlet surrounds the outer side of the air inlet 13.

[0033] For more specific embodiments, see Figures 1 to 3 The breathable and sound-insulating component 3 includes: a sidewall 31 surrounding the outside of the motor 1; the sidewall 31 is provided with a plurality of air holes 311. The air outlet area of ​​the plurality of air holes 311 is larger than the air inlet area of ​​the air inlet 13 of the motor 1. The breathable and sound-insulating component 3 also includes: an annular wall plate 32 extending from the outside of the sidewall 31 in a direction away from the sidewall 31; the annular wall plate 32 is provided with the air outlet 2120. Similarly, the air outlet area of ​​the air outlet 2120 is larger than the air inlet area of ​​the air inlet 13 of the motor 1. Figure 3 As shown, the annular wall panel 32 is provided with a plurality of air holes 311; the plurality of air holes 311 together form the air outlet 2120.

[0034] In practical implementation, the smaller the size of the vents 311 on the sidewall 31, the better the sound insulation effect. This embodiment does not specifically limit the size of the vents. The number and size of the vents can be set according to actual product requirements. Furthermore, the size of the vents on the annular wall panel 32 can be larger than the size of the vents on the sidewall 31. In a specific embodiment, to ensure the sound insulation effect of the vents, such as... Figure 3 As shown, the sidewall 31 and the annular wall plate 32 have a large number of densely arranged pores, with a constant left-right spacing and uniform distribution. The pore diameter ranges from 2mm to 0.5mm, for example, it can be selected as 1mm.

[0035] To ensure the breathable sound insulation component 3 has a good noise reduction effect, it has a certain thickness, ranging from 2mm to 4mm, for example, 3mm. This thickness not only increases its mass and rigidity but also allows each pore on the component to function as a 1mm diameter, 3mm long pipe. The airflow and sound wave transmission within the microporous pipe are constrained by the pipe. The sound source, in the form of spherical waves, often transmits vibrating sound waves around its perimeter. Only the portion of the corrugations perpendicular to the pipe's axis can escape without energy loss. When the incident angle is at an angle to the microporous axis, besides some wave overlap caused by diffuse reflection, some waves can be refracted within the pipe and transmitted. This portion, due to changes in the sound absorption coefficient, is relatively easy to eliminate. Therefore, overall, the microporous structure has a very good noise reduction effect.

[0036] The air outlet area of ​​the multiple vents 311 on the side wall 31 can be equal to or unequal to the air outlet area of ​​the multiple vents on the annular wall panel 32. For example, the air outlet area of ​​the multiple vents on the annular wall panel 32 is greater than the air outlet area of ​​the multiple vents 311 on the side wall 31.

[0037] like Figure 1 As shown, the first housing 2 has an opening, and the annular wall plate 32 of the breathable and sound-insulating component 3 extends in the radial direction of the inner cavity structure 21 of the first housing 2. The annular wall plate 32 closes the opening of the outer cavity 212, and the air outlet 2120 of the air outlet channel is formed by multiple air holes 311 on the annular wall plate 32.

[0038] like Figure 1 As shown, Figure 1The arrows in the diagram indicate the direction of airflow when motor 1 is running. In one specific embodiment, an impeller is mounted on the rotating shaft of motor 1. When motor 1 is working, the impeller rotates, disturbing the air, causing air to be drawn in through the air inlet 13 and discharged through the air outlet 14. The faster the impeller rotates, the faster the airflow velocity from motor 1, and the greater the aerodynamic noise generated by the faster airflow. After the exhaust airflow from the motor passes through the breathable sound insulation component 3 and enters the exhaust channel, the exhaust airflow changes direction and is discharged from the exhaust outlet 2120 on the same side as the motor air inlet 13, thus forming an airflow barrier on the outside of the motor. The motor frequency noise generated during the operation of motor 1 is in the form of spherical waves ( Figure 1 The noise diffuses outward in the form of an arc, and the airflow in the air outlet channel (its directional airflow barrier) disrupts the propagation of noise in the air, blocking relatively sharp high-frequency noise within the airflow barrier. In addition, the disturbance of the airflow causes the frequency of the noise to change, thereby achieving the purpose of noise reduction.

[0039] In the embodiments of this application, the shape of the vent 311 can be, but is not limited to, circular holes, square holes, polygonal holes, elongated holes, etc. For example... Figure 3 In the illustrated embodiment, the sidewall 31 of the breathable sound insulation component 3 has multiple perforated areas, which are evenly distributed along the axial direction of the cross-section of the sidewall 31. For example, the cross-section of the sidewall 31 is circular, and the central angle corresponding to each perforated area is 30 to 90 degrees. The central angle between two adjacent perforated areas can be 5 to 10 degrees. The area between two adjacent perforated areas is a non-perforated area. Air pores 311 are evenly distributed on the perforated areas.

[0040] See Figures 1 to 3 In one embodiment provided in this application, the breathable sound insulation component 3 further includes a connecting structure 33. The connecting structure 33 is disposed on the annular wall panel 32 and is used to connect to the first housing 2. Specifically, there are multiple connecting structures 33, such as two, three, or more. The multiple connecting structures 33 are spaced apart circumferentially along the annular wall panel 32 of the breathable sound insulation component 3. Specifically, the connecting structure 33 is a snap-fit ​​mechanism. When the breathable sound insulation component 3 is installed in the inner cavity structure 21, the snap-fit ​​structure snaps onto the first housing 2.

[0041] In another embodiment provided in this application, in addition to connecting the breathable sound insulation component 3 to the first housing 2 via a snap-fit ​​connection, it can also be connected via fasteners. Specifically, the connecting structure 33 is provided with connecting holes, and fasteners pass through the first housing 2 and are connected to the connecting holes, thereby connecting the sound insulation component 3 to the first housing 2. In the technical solution provided in this application, the connecting structure 33 not only enables the sound insulation component 3 to connect to the first housing 2, but also improves the structural strength between the side wall 31 and the annular wall panel 32.

[0042] Furthermore, such as Figure 1As shown, the breathable sound insulation component 3 has two opposing first ends and second ends. An elastic element 6 is provided at the first end. The elastic element 6 has a through hole corresponding to the air inlet 13. The motor 1 is limited at the first end of the breathable sound insulation component 3 by the elastic element 6. The elastic element 6 can be a soft material with high damping. The arrangement of the elastic element 6 allows the motor to be suspended, maximizing the isolation of the vibration generated by the motor from other parts. The elastic element 6 has a vibration absorption function. In addition, the elastic element 6 can also serve a sealing function, to seal the air inlet 13 of the motor 1 and the first end of the breathable sound insulation component 3 (e.g., at the air inlet 13 of the motor 1 and the first end of the breathable sound insulation component 3). Figure 1 A seal is formed between the first end opening shown.

[0043] It should be added here that: the statement above that "the air outlet 2120 and the air inlet 13 of the motor are located on the same end side of the breathable and sound-insulating component" can be understood as: the air outlet 2120 and the air inlet 13 of the motor are both located at the first end of the breathable and sound-insulating component.

[0044] In a specific implementation plan, see Figure 1 From the second end to the first end of the breathable sound insulation component 3, the distance between the first housing 2 and the breathable sound insulation component 3 gradually increases. For example... Figure 1 As shown, the spacing d1 is smaller than the spacing d2.

[0045] In this embodiment, when the motor 1 rotates at a constant speed, the airflow velocity at the air inlet 13 is constant. Typically, the intake volume of the motor 1 is equal to its exhaust volume. When the airflow discharged from the motor 1 passes through multiple air holes 311 on the breathable sound insulation component 3 from the inner cavity 211 to the outer cavity 212 (i.e., the air outlet channel), the airflow velocity in each air hole is mainly determined by the total cross-sectional area of ​​the multiple air holes 311. The larger the total area, the less airflow occurs per unit area per unit time, resulting in a lower airflow velocity through the air holes 311. When the total cross-sectional area of ​​the multiple air holes 311 is greater than or equal to the cross-sectional area of ​​the air inlet 13, the airflow velocity through the air holes 311 is less than or equal to the airflow velocity at the air inlet 13, thereby reducing the wind noise of the motor 1. The design where the distance between the first housing 2 and the breathable sound insulation component 3 gradually increases from the second end to the first end also contributes to reducing the wind noise of the motor 1.

[0046] like Figure 1The motor 1 shown has an air inlet 13 located at the end of the motor 1, and an air outlet 14 located in the middle of the motor 1. At the same time, the air outlet 14 is also located in the middle of the inner cavity 211. When the air outlet 14 located in the middle of the motor 1 discharges air, it can quickly diffuse the airflow into the entire inner cavity 211. Then the airflow enters the air outlet channel through multiple air holes 311, and then is discharged to the air outlet at the open end (i.e., with large spacing) in the opposite direction to the air inlet direction of the motor. The airflow is smooth and can form a soundproof "wind wall".

[0047] During sound wave propagation, the vibration frequency is affected by the natural frequency of the propagation medium. When the frequency of the sound wave is the same as the natural frequency of the propagation medium, the amplitude of the propagation medium reaches its maximum, and the sound propagation efficiency is also the highest. The natural frequency of the propagation medium is mainly determined by two important parameters: mass and stiffness. With a fixed stiffness, the greater the mass, the lower the natural frequency. In one embodiment provided in this application, the material of the motor 1 is different from that of the breathable sound insulation component 3. The natural frequency of the motor 1 and the natural frequency of the breathable sound insulation component 3 are different. The breathable sound insulation component 3 is fitted outside the motor 1, and most of the noise generated by the motor 1 needs to be propagated through the breathable sound insulation component 3 before spreading outward. When the engine frequency noise generated by the operation of the motor 1 propagates to the breathable sound insulation component 3, due to the difference in their natural frequencies, the efficiency of the engine frequency noise propagating outward through the breathable sound insulation component 3 will be significantly reduced. Similarly, the motor air outlet 14 is located inside the inner cavity 211. When the noise generated by the air outlet 14 is propagated outward through the breathable sound insulation component 3, the propagation efficiency will be significantly reduced because the natural frequency of the breathable sound insulation component 3 and the air are different.

[0048] In another embodiment provided in this application, the material of the breathable sound insulation component 3 is different from the material of the first housing 2. Similarly, when the two materials are different, the natural frequency of the breathable sound insulation component 3 is different from the natural frequency of the first housing 2. The breathable sound insulation component 3 is disposed in the inner cavity structure 21. When the engine frequency noise generated by the operation of the motor 1 propagates outward, it needs to pass not only through the breathable sound insulation component 3 but also through the first housing 2. Since the natural frequency of the breathable sound insulation component 3 is different from the natural frequency of the first housing 2, the propagation efficiency of the noise from the breathable sound insulation component 3 to the first housing 2 will be significantly reduced. Therefore, the noise that can propagate to the outside through the first housing 2 will be significantly reduced.

[0049] Furthermore, such as Figure 1 As shown, the motor assembly provided in this embodiment may further include a second housing 400. The second housing 400 is disposed outside the first housing 2 to form a sound-insulating cavity 41 between the first housing 2 and the second housing 400. Figure 4In the illustrated embodiment, the soundproof cavity 41 may include a side wall cavity 411 and a bottom cavity 412. The soundproof cavity 41 forms a relatively still air layer, and the larger the spacing between the layers, the greater the sound change produced by resonance.

[0050] Furthermore, in specific implementations, the first housing 2 and the second housing 400 are made of different materials.

[0051] See Figures 1 to 4 In one embodiment provided in this application, the second housing 400 includes a rear cover 4. The rear cover 4 is sleeved on the outside of the first housing 2, and a gap is provided between the inner wall of the rear cover 4 and the outer wall of the first housing 2 to form a sound insulation cavity 41. For example, the sound insulation cavity 41 includes a side wall cavity 411 and a bottom cavity 412. Specifically, the rear cover 4 has an open cavity, and the first housing 2 is disposed in the open cavity, and the opening of the first housing 2 and the opening of the rear cover 4 face the same direction. The first housing 2 is disposed in the rear cover 4, and the side wall cavity 411 and the bottom cavity 412 are sealed cavity spaces.

[0052] When the first housing 2 is placed inside the rear cover 4, the bottom of the first housing 2 is connected to the cavity of the rear cover 4. Specifically, as shown... Figure 1 As shown, a connecting boss is provided in the central area of ​​the cavity bottom of the rear cover 4, and the connecting boss can be connected to the through hole in the middle of the bottom wall of the first housing 2. A gap is provided between the bottom wall of the first housing 2 and the cavity bottom of the rear cover 4 to form a bottom cavity 412.

[0053] To further improve the sound insulation effect of the back cover 4, the sound insulation cavity 41 is filled with sound insulation material 42. Specifically, the side wall cavity 411 and the bottom cavity 412 are filled with sound insulation material 42, which includes, but is not limited to: fine fiber material, highly elastic foam material, and loose porous material. When the noise generated by the operation of the motor 1 propagates outward through the sound insulation material 42, the sound insulation material 42 will cause the sound waves to undergo heat loss or viscous loss, thereby reducing the noise.

[0054] See Figures 1 to 4 In one embodiment provided in this application, the second housing further includes a front cover 5, which is connected to the rear cover of the motor 1 to form a cavity. Specifically, the front cover 5 is located at the opening of the rear cover 4, and the front cover 5 also has an open cavity. When the front cover 5 and the rear cover 4 are connected to each other, the opening of the front cover 5 and the opening of the rear cover 4 are aligned to form a complete motor cover. The motor cover has a cavity structure, and the motor 1, the breathable and sound-insulating component 3, and the first housing 2 are all housed within the cavity.

[0055] Furthermore, the front cover 5 is provided with an air inlet duct 51 and an air outlet duct 52. The air inlet duct 51 is connected to the air inlet 13 of the motor 1, and the air outlet duct 52 is located on one side of the outer cavity 212, and the air outlet 2120 is connected to the air outlet duct 52. The air inlet duct 51 is used to guide airflow to the air inlet 13 of the motor 1, while the air outlet duct 52 is used to gather the airflow output from the air outlet 2021 and output it outward. Figure 1 As shown, the axis of the air inlet duct 51 forms an angle with the axis of the motor 1, such as an angle within the range of 70 to 150 degrees. Figure 1 The angle between the axis 501 of the air inlet duct 51 and the axis 1001 of the motor 1 is 90 degrees.

[0056] like Figure 2 As shown, to ensure the directionality of the airflow output from the air outlet 52, an air outlet bracket 7 is provided at one end of the air outlet 52. The air outlet bracket 7 is located at the end of the air outlet 52, thereby further converging the airflow output from the air outlet 52 and discharging it from the air outlet on the air outlet bracket 7. In addition to converging the airflow discharged from the air outlet 52, the air outlet bracket 7 also improves the structural integrity of the motor 1 assembly, allowing the motor 1 assembly to be better adapted to different household appliances.

[0057] The motor assembly provided in this application can be used in various electrical appliances, such as cleaning equipment, hair dryers, and robots (e.g., robots with air purification functions). Cleaning equipment may include, but is not limited to, robotic vacuum cleaners, robotic vacuum and mop combos, floor scrubbers, vacuum cleaners, and anytime vacuums.

[0058] For example, one embodiment of this application provides a cleaning device. The cleaning device includes a device body, a motor assembly, and a cleaning device. The cleaning device can be a brushless nozzle or a nozzle with a roller brush on a vacuum cleaner, or a floor brush on a floor scrubber, etc. The motor assembly can be implemented using the structure provided in the above embodiment; details can be found above and will not be repeated here. The motor assembly is disposed on the device body, and the cleaning device is disposed on the device body, utilizing the suction airflow to clean the object being cleaned.

[0059] For example, another embodiment of this application provides a robot, such as a robot with air purification function, or a robot that provides housekeeping services, etc. The robot includes: a robot body and a motor assembly. The motor assembly can be implemented using the structure provided in the above embodiments, the details of which can be found above and will not be repeated here. The motor assembly is disposed on the robot body.

[0060] Figure 6As shown, another embodiment of this application provides a floor scrubber. The floor scrubber includes a main body 81, a motor assembly 82, and a cleaning device 83. The motor assembly 82 can be implemented using the structure provided in the above embodiments, as detailed above, and will not be repeated here. The motor assembly 82 is mounted on the main body 81, and the cleaning device 83 is mounted on the main body 81, utilizing the suction airflow to clean the object being cleaned. Furthermore, the floor scrubber may also include a handle, an extension rod, a wastewater tank, a clean water tank, a display screen, etc., but this embodiment does not specifically limit these components.

[0061] In summary, the technical solution of this application achieves noise reduction in the following aspects:

[0062] 1. Multiple cavities are formed on the outside of the motor, such as the outer cavity, inner cavity, and sound insulation cavity between the first and second housings mentioned above, etc., and more can be added. This embodiment utilizes multiple cavities to reduce low-frequency and high-frequency noise.

[0063] 2. The noise source (i.e., the motor) is encased to the maximum extent through a microporous structure. The microporous structure refers to the multiple pores set on the breathable sound insulation component. The microporous structure can expose as few excitation paths as possible. At the same time, the cavity between the breathable sound insulation component with the microporous structure and the first shell forms a resonant sound absorption structure, which can excite sound waves to bounce multiple times in the cavity to consume sound energy, thereby achieving the purpose of sound absorption.

[0064] 3. The breathable and sound-insulating component divides the internal cavity structure between the motor and the first housing into an inner cavity and an outer cavity. The outer cavity, which serves as an air outlet channel surrounding the motor, has an air outlet, and the air outlet is located on the same side as the motor's air inlet. In this way, the airflow generated by the motor enters the air outlet channel through the breathable and sound-insulating component. Because the air outlet and air inlet are on the same side, the airflow is contained within the air outlet channel and surrounds the motor, forming a "wind wall" that prevents motor noise from spreading outward and isolates the noise within the "wind wall." In addition, the airflow disturbance surrounding the motor in the air outlet channel will also cause the noise frequency to change, thereby achieving the purpose of noise reduction.

[0065] 4. By utilizing the different resonant frequencies of different materials, such as the breathable sound insulation component being made of a different material than the first shell, and / or the first shell being made of a different material than the second shell, frequency changes occur during the transmission of vibration frequencies through the air, thereby achieving noise reduction.

[0066] 5. A material with a high acoustic impedance coefficient, i.e., a sound insulation material, is placed between the first shell and the second shell. When noise is transmitted in the porous material, heat loss and viscous loss are continuously generated, and part of the sound energy is converted into heat energy, thereby reducing noise.

[0067] To facilitate understanding of the technical solution of this application, specific application scenarios are given below to describe the technical solution proposed in this application.

[0068] Application Scenario 1

[0069] The motor assembly described in the above embodiments can be used in a vacuum cleaner. When the motor assembly operates, it generates a suction airflow that creates negative pressure between the vacuum cleaner and the floor. The motor produces motor frequency noise during operation, and the increased airflow velocity after being drawn in generates significant aerodynamic noise. The breathable and sound-insulating components inside the motor assembly can reduce the airflow velocity without affecting the airflow volume, thereby reducing aerodynamic noise. In addition, the breathable and sound-insulating component divides the internal cavity structure between the motor and the first housing into an inner cavity and an outer cavity. The outer cavity, which serves as an air outlet channel surrounding the motor, has an air outlet, and the air outlet and the air inlet of the motor are located on the same side. In this way, the airflow generated by the motor enters the air outlet channel through the breathable and sound-insulating component. Because the air outlet and the air inlet are on the same side, the airflow is contained within the air outlet channel and surrounds the motor, forming an "air wall" that prevents motor noise from spreading outward and isolates the noise within the "air wall." Furthermore, the airflow disturbance surrounding the motor in the air outlet channel also changes the frequency of the noise, effectively reducing the overall noise of the motor assembly. Users will have a better user experience when using the vacuum cleaner.

[0070] Application Scenario 2

[0071] The motor assembly described in the above embodiments can be used in a floor scrubber. During cleaning operations, the floor scrubber not only cleans stains on the floor but also sucks away wastewater or dirt. The motor assembly generates a suction airflow to provide the negative pressure required for cleaning and dust removal. A breathable and sound-insulating component within the motor assembly divides the internal structure between the motor and the first housing into an inner cavity and an outer cavity. The outer cavity, serving as an air outlet channel surrounding the motor, has an air outlet, and the air outlet is located on the same side as the motor's air inlet. Thus, the airflow generated by the motor enters the air outlet channel through the breathable and sound-insulating component. Because the air outlet and air inlet are on the same side, the airflow surrounds the motor within the air outlet channel, forming an "air wall" that prevents motor noise from propagating outward, isolating the noise within the "air wall." Furthermore, the airflow disturbance surrounding the motor within the air outlet channel causes a change in noise frequency, effectively reducing the overall noise of the motor assembly. Furthermore, a second housing is installed outside the first housing, and sound insulation material is placed between the first and second housings to further reduce the motor's frequency noise. When users start the floor scrubber to clean their floors, the low noise level ensures high user comfort, and it can be used while family members are studying or resting.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A motor assembly, characterized in that, include: First shell; A breathable and sound-insulating component is installed inside the first housing, dividing the space inside the first housing into an inner cavity and an outer cavity; The motor is located within the inner cavity; The outer cavity serves as an air outlet channel surrounding the motor. The cavity wall of the outer cavity is provided with an air outlet, and the air outlet and the air inlet of the motor are located on the same end side of the breathable and sound-insulating component. When the motor is working, airflow enters the motor through the air inlet, and the exhaust airflow from the motor enters the air outlet channel through the breathable and sound-insulating component and is discharged through the air outlet. The breathable and sound-insulating component includes a side wall surrounding the outside of the motor and a wall panel extending from the outside of the side wall in a direction away from the side wall, and the wall panel is provided with the air outlet.

2. The motor assembly according to claim 1, characterized in that, The air outlet is an annular air outlet, which surrounds the outer side of the air inlet.

3. The motor assembly according to claim 1, characterized in that, The side wall is provided with multiple air holes, and the air outlet area of ​​the multiple air holes is larger than the air inlet area of ​​the air inlet.

4. The motor assembly according to claim 3, characterized in that, The wall panel is a ring-shaped wall panel; The air outlet has a larger air outlet area than the air inlet area.

5. The motor assembly according to any one of claims 1 to 4, characterized in that, The breathable and sound-insulating component has two opposing first ends and second ends; An elastic element is provided at the first end; The elastic element is provided with a through hole corresponding to the air inlet; The motor is limited at the first end by the elastic element.

6. The motor assembly according to claim 5, characterized in that, From the second end to the first end, the distance between the first housing and the breathable sound insulation component gradually increases.

7. The motor assembly according to any one of claims 1 to 4, characterized in that, Also includes: The second housing is disposed outside the first housing to form a soundproof cavity between the first housing and the second housing.

8. The motor assembly according to claim 7, characterized in that, The soundproof cavity is equipped with soundproofing material.

9. The motor assembly according to claim 7, characterized in that, The first housing and the second housing are made of different materials; and / or The first housing is made of a different material than the breathable and sound-insulating component.

10. The motor assembly according to claim 7, characterized in that, The second housing includes a connected front cover and a rear cover; The rear cover is fitted onto the outside of the first housing; The front cover is provided with an air inlet duct communicating with the air inlet and an air outlet duct communicating with the air outlet. The axis of the air inlet duct is at an angle to the axis of the motor.

11. A cleaning device, characterized in that, include: Equipment body; The motor assembly according to any one of claims 1 to 10 is disposed on the device body and is used to generate a suction airflow; A cleaning device is installed on the equipment body and uses the suction airflow to clean the object being cleaned.

12. A floor scrubbing machine, characterized in that, include: Floor scrubber body; The motor assembly according to any one of claims 1 to 10 is disposed on the main body of the floor scrubber and is used to generate a suction airflow; A cleaning device is installed on the main body of the floor scrubber, which uses the suction airflow to clean the object being cleaned.

13. A robot, characterized in that, include: Robot body; The motor assembly according to any one of claims 1 to 10 is disposed on the robot body and is used to generate a suction airflow.

Images