Motor assembly for vacuum cleaners and vacuum cleaners

Abstract

This invention discloses a motor assembly for a vacuum cleaner and a vacuum cleaner. The motor assembly for the vacuum cleaner includes a first cover and a second cover. The first cover contains a motor. The second cover is connected to and communicates with the first cover, and the second cover has an air outlet. A noise-absorbing structure is disposed within the second cover and located between the first cover and the air outlet. The motor assembly and vacuum cleaner according to embodiments of this invention have low overall noise, high sound quality, simple structure, low cost, and are easy to assemble.

Description

Technical Field

[0001] This invention relates to the field of cleaning appliance technology, and in particular to a motor assembly for a vacuum cleaner and a vacuum cleaner. Background Technology

[0002] Noise from vacuum cleaners has always been a difficult problem to solve in the industry and a major pain point for consumers. In a vacuum cleaner, air containing dirt passes through the internal components, where it undergoes dust-air separation in the dust cup before being expelled through the outlet. The main sources of noise in vacuum cleaners fall into two categories: noise generated by motor vibration and noise from the rapid airflow produced when air is quickly drawn in and expelled.

[0003] Common noise reduction solutions include using multi-layered motor covers for sound insulation, and using tortuous air ducts to increase sound wave refraction and reflection, as well as using sound-absorbing materials. While these methods achieve some noise reduction, they are costly to produce, involve complex processes, and rely on resistive sound absorption. While these materials are effective for high-frequency noise, their effectiveness is limited for low-frequency noise. Furthermore, because airflow is obstructed within the vacuum cleaner's internal space, it cannot be quickly dispersed and smoothly expelled, potentially increasing the machine's temperature and affecting its lifespan. Summary of the Invention

[0004] In view of the defects and deficiencies of the prior art, one object of the present invention is to provide a motor assembly for a vacuum cleaner, the motor assembly for the vacuum cleaner having a first cover, a second cover and a silencing structure, the first cover including a motor; the second cover being connected to and communicating with the first cover, and the second cover having an air outlet, the silencing structure being disposed in the second cover and located between the first cover and the air outlet.

[0005] According to an embodiment of the present invention, the motor assembly for a vacuum cleaner has a sound-absorbing structure added at the air outlet of the second cover, which avoids multiple refractions and reflections of airflow inside the cover, thereby preventing multiple impacts and frictions on the internal components of the vacuum cleaner. This reduces noise, extends the service life of the vacuum cleaner, and also results in low production cost, simple structure, and easy assembly.

[0006] In addition, the motor assembly for a vacuum cleaner according to the above embodiments of the present invention may also have the following additional technical features:

[0007] In some embodiments, the noise-absorbing structure includes: a first enclosure and a second enclosure.

[0008] The first enclosure has multiple sound-absorbing holes spaced apart; the first enclosure and the second enclosure are nested inside and outside, forming a closed sound-absorbing cavity between the first enclosure and the second enclosure.

[0009] In some embodiments, the second enclosure surrounds the outside of the first enclosure.

[0010] In some embodiments, the perforation rate of the plurality of silencing holes on the first enclosure is p = π / 4(d / B) × 100%, where d represents the diameter of the silencing hole and B represents the distance between two adjacent silencing holes.

[0011] In some embodiments, the silencing cavity is provided with at least two partitions arranged at intervals along the circumference of the silencing cavity, and the at least two partitions distribute the silencing cavity into a plurality of mutually separated cavities, each of which is connected to the external space of the silencing cavity through the silencing hole.

[0012] In some embodiments, the noise reduction structure further includes a first plate portion and a second plate portion, both of which are connected to the first enclosure plate and the second enclosure plate, and the noise reduction cavity is formed between the first plate portion, the second plate portion, the first enclosure plate, and the second enclosure plate, wherein the outer edge of the second plate portion is connected to one end of the second enclosure plate, and the inner edge of the second plate portion is provided with a first notch, and one end of the first enclosure plate is embedded in the first notch.

[0013] The inner side plate of the first plate is provided with a second notch, and the other end of the first plate is embedded in the second notch;

[0014] The outer edge of the first plate is provided with a flange, and the other end of the second plate is embedded inside the flange.

[0015] In some embodiments, the first cover has at least one ventilation hole, and the motor is adapted to drive airflow from the first cover into the second cover through the ventilation hole.

[0016] In some embodiments, the silencing structure is annular, and in a top-down projection, the silencing structure surrounds the ventilation hole.

[0017] In some embodiments, the bottom surface of the first cover is provided with a downwardly extending flange, and the upper edge of the inner peripheral surface of the sound-absorbing structure is provided with a third notch, and the flange is embedded in the third notch.

[0018] In some embodiments, the inner or outer wall of the silencing structure is provided with silencing holes that connect the inner and outer spaces of the silencing structure.

[0019] In some embodiments, the motor extends vertically, and the ventilation holes are spaced apart along the direction surrounding the motor shaft.

[0020] In some embodiments, there is a gap between the silencing structure and the inner bottom surface of the second enclosure.

[0021] In some embodiments, the upper end of the motor is connected to the upper end of the first cover with a first buffer, and the lower end of the motor is also connected to the lower end of the first cover with a second buffer.

[0022] In some embodiments, the top surface of the first cover is provided with an opening, and the inner edge of the opening is provided with a downwardly extending first positioning protrusion, which is embedded in the first buffer member.

[0023] In some embodiments, the second buffer is disposed on the inner bottom surface of the first cover and supported at the middle position of the lower end of the motor. The inner wall surface of the first cover is provided with an upwardly extending second positioning protrusion. The second positioning protrusion is arranged circumferentially along the first cover, and the lower end of the second buffer is embedded in the inner side of the second positioning protrusion.

[0024] In some embodiments, air outlets are provided on both the left and right sides of the second cover, and a filter element is provided inside the second cover. The filter element is located at the air outlet and is adapted to filter the airflow flowing out from the air outlet.

[0025] In some embodiments, a sealing ring is provided between the first cover and the second cover, the end periphery of the first cover is provided with an outwardly extending flange, the sealing ring has a covering portion covering the flange, and the sealing ring has a lug extending circumferentially along the sealing ring, the lug abutting against the upper surface of the filter element.

[0026] In some embodiments, the filter element includes a filter screen, a first cover plate, and a second cover plate, wherein the first cover plate covers the top of the filter screen, the second cover plate covers the bottom of the filter screen, and the lug abuts against the first cover plate.

[0027] Another object of the present invention is to provide a vacuum cleaner.

[0028] A vacuum cleaner according to an embodiment of the present invention includes: a dust cup and a motor assembly, the dust cup having a dust inlet and a dust outlet, the inlet of the motor assembly being connected to the dust inlet, and the motor assembly being a motor assembly for a vacuum cleaner as described above.

[0029] The vacuum cleaner according to embodiments of the present invention has the advantages of high sound quality, low noise, and low production cost. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view along the vertical direction of one embodiment of an object of the present invention.

[0031] Figure 2 yes Figure 1 A partial view of the sound-absorbing structure.

[0032] Figure 3 yes Figure 1 A schematic diagram of the sound-absorbing structure in one direction.

[0033] Figure 4 yes Figure 1 Side view of the sound-absorbing structure.

[0034] Figure 5 yes Figure 1 Enlarged view of area A in the middle.

[0035] Figure 6 yes Figure 1 Enlarged view of area B in the middle.

[0036] Figure 7 yes Figure 1 Enlarged view of area C.

[0037] Figure label:

[0038] Motor assembly 10 for a vacuum cleaner

[0039] First enclosure 1, second enclosure 2, sound-absorbing structure 3, first surrounding plate 31, second surrounding plate 32, sound-absorbing hole 33, sound-absorbing cavity 34, partition 35, first plate part 36, second plate part 37, first notch groove 371, second notch groove 361, ventilation hole 11, flange part 12, third notch groove 38, first buffer part 4, second buffer part 5, opening 6, first positioning protrusion 7, second positioning protrusion 8, filter part 21, sealing ring 9, flange 13, motor 14, covering part 91, lug 92, filter screen 211, first cover plate 212, second cover plate 213, air outlet 22. Detailed Implementation

[0040] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to 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 invention according to the specific circumstances.

[0043] The following is in conjunction with the appendix Figures 1 to 7 This describes a motor assembly 10 for a vacuum cleaner according to an embodiment of the present invention.

[0044] Combination Figure 1 According to an embodiment of the present invention, a motor assembly 10 for a vacuum cleaner includes a first cover 1, a second cover 2, and a noise reduction structure 3.

[0045] The first cover 1 includes a motor 14, which drives the impeller to rotate, thereby drawing dust-laden gas into the dust cup inlet of the vacuum cleaner. After dust and gas are separated in the dust cup, the dust remains in the dust cup, and the airflow is then driven by the impeller to flow out of the vacuum cleaner.

[0046] The second cover 2 is connected to the first cover 1 and communicates with the first cover 1. The second cover 2 has an air outlet 22. In other words, the first cover 1 and the second cover 2 are connected vertically. The first cover 1 is located above the second cover 2, and the bottom surface of the first cover 1 has an opening or through hole or other structural form, so that the internal spaces of the first cover 1 and the second cover 2 are connected, so that the airflow flows from the first cover 1 into the second cover 2 and then exits from the air outlet 22 of the second cover 2.

[0047] The noise reduction structure 3 is located inside the second cover 2 and between the first cover 1 and the air outlet 22. That is, the noise reduction structure is located downstream of the airflow path. The present invention aims to eliminate noise on the air outlet side, thereby avoiding repeated airflow within the vacuum cleaner, and thus avoiding repeated collisions and friction between the airflow and internal components of the vacuum cleaner (such as the motor 14), thereby improving the reliability of the vacuum cleaner while reducing noise.

[0048] The sound-absorbing structure 3 can take many forms, such as using a thin plate or film resonant sound-absorbing structure, a perforated plate or micro-perforated plate sound-absorbing structure, or a shark fin sound-absorbing and air-guiding structure at the air outlet, or a sound-absorbing louver structure, etc., which will not be listed here.

[0049] Preferably, combined with Figures 1 to 4 The sound-absorbing structure 3 includes a first enclosure 31 and a second enclosure 32. The first enclosure 31 has a plurality of sound-absorbing holes 33 spaced apart. The first enclosure 31 and the second enclosure 32 are nested inside and outside each other, forming a closed sound-absorbing cavity 34 between the first enclosure 31 and the second enclosure 32.

[0050] As can be seen, the above embodiment uses a micro-perforated plate sound-absorbing structure. The micro-perforated plate sound-absorbing structure consists of a thin metal plate with a certain perforation rate and a hole diameter of less than 1 mm and an air layer behind the plate. Because the plate is thin, the hole diameter is small, the acoustic impedance is large, the weight is light, the structure is simple, the processing is convenient, and the application scenarios are wide. More importantly, it has a high sound absorption coefficient and a wide sound absorption bandwidth.

[0051] Combination Figures 2 to 4 The second enclosure 32 surrounds the outside of the first enclosure 31. In this embodiment, the first enclosure 31 has sound-absorbing holes 33, and the second enclosure 32 serves as a back plate surrounding the outside of the first enclosure 31. However, alternatively, in other embodiments, the positions of the second enclosure 32 and the first enclosure 31 can be interchanged. That is, the second enclosure 32 has sound-absorbing holes 33, while the first enclosure does not, and it serves as a back plate surrounded by the second enclosure 32. Both methods can achieve the purpose of noise reduction.

[0052] Combination Figures 2 to 4 The first enclosure 31 has multiple sound-absorbing holes 33, and the formula for calculating its perforation rate is as follows: Where d represents the diameter of the silencing hole, and B represents the distance between two adjacent silencing holes. Furthermore, according to the Helmholtz resonant cavity principle, the resonant frequency of the single-layer micro-perforated plate sound-absorbing structure... Where c represents the speed of sound, d represents the diameter of the silencing hole, h represents the cavity depth, and t represents the thickness of the perforated plate.

[0053] The single-layer micro-perforated plate sound-absorbing structure is actually a resonant sound-absorbing structure. When the sound wave of the airflow is in the low-frequency range, its noise reduction can be calculated using the formula for a resonant silencer. Furthermore, when the frequency of the airflow sound wave is near the resonant frequency f0, noise reduction can be maximized. In other words, by adjusting the thickness of the first enclosure plate 31 and the cavity depth of the silencing cavity 34, the sound waves of the airflow near the resonant frequency f0 can be eliminated. More precisely, noise in a specific frequency range can be eliminated. This specific frequency range is centered on the resonant frequency f0 of the single-layer micro-perforated plate sound-absorbing structure, and this specific frequency range can be adjusted by adjusting the thickness of the first enclosure plate 31 and the cavity depth of the silencing cavity 34.

[0054] In summary, by selecting different perforation rates and thicknesses of the first enclosure plate 31 and different cavity depths of the silencing cavity 34, the spectral performance of the silencing structure 3 can be controlled, enabling it to achieve good silencing effects within the required frequency range.

[0055] Optionally, combined Figure 3 The silencing cavity 34 is provided with at least two partitions 35 arranged at intervals along the circumference of the silencing cavity 34. The at least two partitions 35 distribute the silencing cavity 34 into multiple cavities that are separated from each other. Each cavity is connected to the external space of the silencing cavity 34 through a silencing hole 33.

[0056] Dividing the silencing cavity 34 into multiple cavities can change its inherent vibration frequency, thereby altering the acoustic cavity mode of the silencing cavity 34. This allows it to selectively absorb noise in specific frequency bands. By controlling the shape of the cavity, the selection of noise in a specific frequency band centered on its resonant frequency can be achieved, thus achieving a good sound absorption effect and expanding the application range to a certain extent.

[0057] The noise reduction structure 3 also includes a first plate portion 36 and a second plate portion 37. Both the first plate portion 36 and the second plate portion 37 are connected to the first enclosure plate 31 and the second enclosure plate 32. A noise reduction cavity 34 is formed between the first plate portion 36, the second plate portion 37, the first enclosure plate 31 and the second enclosure plate 32. The noise reduction structure 3 can be integrally stamped or assembled together to form an integral structure, as long as the integrity of the noise reduction cavity 34 is satisfied.

[0058] To make the structure more stable and to form a complete cavity, combined with Figure 2 and Figure 5 , Figure 6The second plate portion 37 has its outer edge connected to one end of the second surrounding plate 32. The inner edge of the second plate portion 37 has a first notch 371, and one end of the first surrounding plate 31 is inserted into the first notch 371. The inner side plate of the first plate portion 35 has a second notch 361, and the other end of the first surrounding plate 31 is inserted into the second notch 361. The outer edge of the first plate portion 35 has a flange, and the other end of the second surrounding plate 32 is embedded inside the flange.

[0059] Combination Figure 1 The first cover 1 has at least one ventilation hole 11, specifically, referring to Figure 1 The bottom wall of the first cover 1 has at least one ventilation hole 11, and the motor 14 is adapted to drive airflow from inside the first cover 1 into the second cover 2 through the ventilation hole 11. The ventilation hole 11 can be a single ventilation hole with a large diameter, or multiple ventilation holes.

[0060] Optionally, a plurality of ventilation holes 11 extend around the motor shaft on the bottom wall of the first cover 1 and form an annular area. The inner diameter of this annular area is the distance from the center line of the motor shaft in the horizontal direction to the outer edge of the second positioning protrusion 8, and the outer diameter is the distance from the center line of the motor shaft in the horizontal direction to the first enclosure 31.

[0061] The structural design of multiple ventilation holes 8 not only ensures the unimpeded flow of air from the first cover 1 to the second cover 2, but also achieves noise reduction of the airflow. This is because the ventilation holes are located on the bottom wall of the first cover 1 and on the top wall of the second cover 2, forming a cavity inside the second cover 32. This basically conforms to the construction of a perforated plate sound-absorbing structure. In other words, due to the small diameter of the ventilation holes 8 and the high sound resistance, as well as the sound absorption of the cavity inside the second cover 2, the sound absorption coefficient of noise is improved.

[0062] Preferably, the silencing structure 3 is annular, and in a downward projection, the silencing structure 3 surrounds the ventilation hole 11.

[0063] Alternatively, the sound-absorbing structure 3 can also be square or other shapes, as long as it can surround the ventilation hole 11 so that the airflow flowing through the ventilation hole 11 can be effectively absorbed.

[0064] Combination Figure 1 and Figure 5 The bottom surface of the first cover 1 is provided with a downwardly extending flange, and the upper edge of the inner circumferential surface of the sound-absorbing structure 3 is provided with a third notch 38, into which the flange is embedded. The flange extends into the third notch 38, so that the bottom wall of the first cover 1 fits against the first plate portion 35 of the sound-absorbing structure 3.

[0065] In other words, the silencing structure 3 is fixed to the upper part inside the second cover 2, and a gap is formed between the silencing structure 3 and the bottom wall of the second cover 2. In this way, after the airflow comes out from the ventilation hole 11, part of it enters the silencing structure 3 and is absorbed, while the other part flows through the silencing structure 3 and the gap between the silencing structure 3 and the bottom wall of the second cover 2, and flows to the left and right air outlets 2 respectively, thereby extending the path of the airflow. At the same time, since the main functional components of the vacuum cleaner are not placed inside, collisions with the functional components are avoided, and noise reduction is achieved to a certain extent.

[0066] Optionally, the inner or outer sidewall of the sound-absorbing structure 3 is provided with sound-absorbing holes 33 that connect the inner and outer spaces of the sound-absorbing structure 3. In other words, the sound-absorbing structure 3 in this embodiment of the invention is preferably a single-layer micro-perforated plate sound-absorbing structure, where one of the first surrounding plate 31 and the second surrounding plate 32 serves as a perforated plate and the other as a back plate, both of which can achieve the purpose of sound absorption and noise reduction.

[0067] Combination Figure 1 The motor 14 extends vertically, and the ventilation holes 11 are spaced apart along the direction surrounding the motor shaft of the motor 14. The ventilation holes 11 are distributed on a circular band centered on the top-to-bottom projection point of the motor shaft of the motor 14 on the bottom wall of the first cover 1.

[0068] Alternatively, the ventilation holes 11 can also have different distribution patterns, such as a square distribution.

[0069] Combination Figure 1 There is a gap between the silencing structure 3 and the inner bottom surface of the second cover 2. The gap between the silencing structure 3 and the bottom facilitates airflow through the gap to reach the air outlet 22, which to a certain extent prolongs the airflow channel and is more conducive to reducing noise.

[0070] Combination Figure 1 A first buffer 4 is connected to the upper end of the motor 14 and the upper end of the first cover 1, and a second buffer 5 is connected to the lower end of the motor 14 and the lower end of the first cover 1. To ensure the dust collection effect, vacuum cleaners usually use relatively high-power motors. At the same time, the high power of the motor generally results in a relatively high frequency of brush commutation and rotor rotation, which leads to a relatively high vibration frequency of the motor and thus generates noise. In this embodiment of the invention, in order to reduce the noise generated by motor vibration, buffers are provided at the connection between the motor 14 and the first cover 1. The buffers are the first buffer 4 and the second buffer 5, located at the upper and lower ends of the motor 14, respectively. They can be rubber rings, sponge pads, or other elastic materials with cushioning function.

[0071] Combination Figure 1The top surface of the first cover 2 is provided with an opening 6, and the inner edge of the opening 6 is provided with a downwardly extending first positioning protrusion 7, which is embedded in the first buffer member 4. The first positioning protrusion 7 is used for vertical and horizontal positioning of the motor 14.

[0072] Combination Figure 1 The second buffer 5 is located on the inner bottom surface of the first cover 1 and supported at the middle position of the lower end of the motor 14. The inner wall surface of the first cover 1 is provided with an upwardly extending second positioning protrusion 8. The second positioning protrusion 8 is arranged along the circumference of the first cover 2. The lower end of the second buffer 5 is embedded in the inner side of the second positioning protrusion 8.

[0073] To prevent the vibration of the motor 14 from being transmitted to the first cover 1, a second buffer 5 is connected to the lower end of the motor 14 and the bottom wall of the first cover 1. The second buffer 5 is on the bottom wall of the first cover 1 and is limited to the left and right by the second positioning protrusion 8. Since the second buffer 5 is connected to the lower end of the motor 14, its upper and lower limits are completed by the gravity of the motor 14.

[0074] Combination Figure 1 Air outlets 22 are provided on both the left and right sides of the second cover 2. A filter element 21 is provided inside the second cover 2. The filter element 21 is located at the air outlet 22 and is suitable for filtering the airflow flowing out from the air outlet 22.

[0075] To improve user experience and prevent the airflow from carrying too much dust in the air outlet 22, in addition to the initial separation and filtration of dust carried in the airflow in the dust cup (not shown in the figure) of the vacuum cleaner, a filter element 21 is also specially provided at the air outlet 22. In some embodiments, the filter element 21 is preferably a HEPA filter, which is a high-efficiency particulate filter. It is effective and safe in removing particulate pollutants in the airflow. At the same time, since the HEPA filter has a relatively high wind resistance, it can also reduce wind noise to a certain extent.

[0076] Of course, the present invention is not limited to HEPA filters, but can also be other types of filters.

[0077] Combination Figure 1 and Figure 7 A sealing ring 9 is provided between the first cover 1 and the second cover 2. The end periphery of the first cover 1 is provided with an outwardly extending flange 13. The sealing ring 9 has a covering part 91 covering the flange 9. The sealing ring 9 has a lug 92 extending circumferentially along the sealing ring 9. The lug 92 abuts against the upper surface of the filter element 21.

[0078] By using the sealing ring 9, the first cover 1 and the second cover 2 are sealed together to prevent airflow leakage, thereby reducing the aerodynamic noise of the airflow to a certain extent. At the same time, the lug 92 abuts against the upper surface of the filter element 21, which on the one hand realizes its own vertical positioning, and on the other hand plays a buffering role against the vibration of the first cover 1, thereby reducing the overall noise of the vacuum cleaner.

[0079] Combination Figure 1 and Figure 7 The filter element 21 includes: a filter screen 211, a first cover plate 212, and a second cover plate 213. The first cover plate 212 covers the top of the filter screen 211, and the second cover plate 213 covers the bottom of the filter screen 211. The lug 92 abuts against the first cover plate 212.

[0080] The first cover plate 212 and the second cover plate 213 can effectively fix the filter screen 211, so that it covers the air outlet 22 and does not shift, thereby playing a role in filtration and purification.

[0081] Another object of the present invention is to provide a vacuum cleaner comprising: a dust cup (not shown in the figure) and a motor assembly, the dust cup having a dust inlet (not shown in the figure) and a dust outlet (not shown in the figure), the inlet of the motor assembly being connected to the dust inlet, and the motor assembly being the motor assembly 10 for a vacuum cleaner as described above. Thus, the vacuum cleaner of the present invention possesses all the advantages described above.

[0082] In summary, the silencing structure 3 in this embodiment of the invention is mainly a micro-perforated plate silencer. A micro-perforated plate silencer is a sound-absorbing element with high acoustic impedance and low acoustic quality. The acoustic impedance is inversely proportional to the aperture of the perforated plate; the micro-perforated plate has a very small aperture, resulting in a high acoustic impedance and thus improving the structure's sound absorption coefficient. The low perforation rate reduces its acoustic quality, broadening the sound absorption bandwidth that depends on the acoustic impedance to acoustic quality ratio. Simultaneously, the cavity behind the micro-perforated plate can effectively control the position of its absorption peak, ensuring a high sound absorption coefficient over a wide frequency band. Using the micro-perforated plate silencer in the structure of this embodiment of the invention results in a significant sound absorption effect.

[0083] Furthermore, in the embodiments of the present invention, the first cover 1 is mainly used to enclose the motor 14, and can therefore be called the motor cover. The second cover 2 is mainly used to enclose the air outlet channel, and can be called the air outlet cover. The air outlet cover and the motor cover are arranged vertically. The noise reduction structure 3 is set inside the air outlet cover. The structure is simple and easy to implement. The noise reduction structure 3 adopts a single-layer micro-perforated plate silencer. Although it is not limited to a single-layer micro-perforated plate silencer, its structure is simple, the production cost is low, and it is easy to assemble. It effectively reduces the overall noise of the vacuum cleaner in a specific frequency range and improves the sound quality of the product.

[0084] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0085] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0086] 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 the present invention. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0087] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A motor assembly for a vacuum cleaner, characterized in that, include: A first enclosure, the first enclosure containing a motor; A second cover is connected to and communicates with the first cover, and the second cover has an air outlet. A noise-absorbing structure is disposed inside the second cover and located between the first cover and the air outlet; The noise reduction structure includes: The first enclosure has multiple sound-absorbing holes spaced apart on it. The second enclosure is nested inside and outside the first enclosure and the second enclosure, forming a closed sound-absorbing cavity between the first enclosure and the second enclosure; The silencing cavity is provided with at least two partitions arranged at intervals along the circumference of the silencing cavity. The at least two partitions divide the silencing cavity into a plurality of cavities that are separated from each other. Each cavity is connected to the external space of the silencing cavity through the silencing hole. The sound-absorbing structure further includes a first plate portion and a second plate portion, both of which are connected to the first enclosure plate and the second enclosure plate, and the sound-absorbing cavity is formed between the first plate portion, the second plate portion, the first enclosure plate, and the second enclosure plate. Wherein, the outer edge of the second plate is connected to one end of the second enclosure, the inner edge of the second plate is provided with a first notch, and one end of the first enclosure is embedded in the first notch. The inner side plate of the first plate is provided with a second notch, and the other end of the first plate is embedded in the second notch; The outer edge of the first plate is provided with a flange, and the other end of the second plate is embedded inside the flange.

2. The motor assembly for a vacuum cleaner according to claim 1, characterized in that, The second enclosure surrounds the outside of the first enclosure.

3. The motor assembly for a vacuum cleaner according to claim 1, characterized in that, The perforation rate of the multiple sound-absorbing holes on the first enclosure plate , where d represents the diameter of the silencing hole, and B represents the distance between two adjacent silencing holes.

4. The motor assembly for a vacuum cleaner according to any one of claims 1-3, characterized in that, The first cover has at least one ventilation hole, and the motor is adapted to drive airflow from the first cover into the second cover through the ventilation hole.

5. The motor assembly for a vacuum cleaner according to claim 4, characterized in that, The sound-absorbing structure is ring-shaped and surrounds the outside of the ventilation hole.

6. The motor assembly for a vacuum cleaner according to claim 5, characterized in that, The first cover has a downwardly extending flange, and the upper edge of the inner circumferential surface of the sound-absorbing structure has a third notch, and the flange is embedded in the third notch.

7. The motor assembly for a vacuum cleaner according to claim 5, characterized in that, The inner or outer wall of the silencing structure is provided with silencing holes that connect the inner and outer spaces of the silencing structure.

8. The motor assembly for a vacuum cleaner according to claim 4, characterized in that, The first cover and the second cover are arranged vertically, the motor extends vertically, and the ventilation holes are spaced apart along the direction surrounding the motor shaft.

9. The motor assembly for a vacuum cleaner according to claim 4, characterized in that, There is a gap between the sound-absorbing structure and the inner bottom surface of the second cover.

10. The motor assembly for a vacuum cleaner according to claim 1, characterized in that, The upper end of the motor is connected to the upper end of the first cover with a first buffer component, and the lower end of the motor is also connected to the lower end of the first cover with a second buffer component.

11. The motor assembly for a vacuum cleaner according to claim 10, characterized in that, The top surface of the first cover is provided with an opening, and the inner edge of the opening is provided with a first positioning protrusion extending downward, the first positioning protrusion being embedded in the first buffer member.

12. The motor assembly for a vacuum cleaner according to claim 10, characterized in that, The second buffer is located on the inner bottom surface of the first cover and supported at the middle position of the lower end of the motor. The inner wall surface of the first cover is provided with an upwardly extending second positioning protrusion. The second positioning protrusion is arranged along the circumference of the first cover. The lower end of the second buffer is embedded in the inner side of the second positioning protrusion.

13. The motor assembly for a vacuum cleaner according to claim 1, characterized in that, The second cover has air outlets on both the left and right sides. A filter is provided inside the second cover and is located at the air outlet. The filter is adapted to filter the airflow coming out of the air outlet.

14. The motor assembly for a vacuum cleaner according to claim 13, characterized in that, A sealing ring is provided between the first cover and the second cover. The end periphery of the first cover is provided with an outwardly extending flange. The sealing ring has a covering portion that covers the flange. The sealing ring has a lug that extends circumferentially along the sealing ring and abuts against the upper surface of the filter element.

15. The motor assembly for a vacuum cleaner according to claim 14, characterized in that, The filter element includes: Filter screen; A first cover plate, which seals the top of the filter screen; A second cover plate, which seals the bottom of the filter screen; The lug abuts against the first cover plate.

16. A vacuum cleaner, characterized in that, include: A dust cup, wherein the dust cup has a dust inlet and a dust outlet; A motor assembly, the inlet of which is connected to the dust inlet, wherein the motor assembly is a motor assembly for a vacuum cleaner according to any one of claims 1-15.

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