Power assemblies and surface cleaning equipment

Abstract

Embodiments of this application provide a power assembly and a surface cleaning device, the power assembly comprising a power source configured to provide fluid power and a sound-dampening chamber provided around the power source and configured to have an axial depth and a radial depth, wherein the radial depth is configured to dampen noise in a first frequency range and the axial depth is configured to dampen noise in a second frequency range, and the axial depth is 20 mm or more and 120 mm or less.

Description

Technical Field

[0001] [Cross - reference to Related Applications] This application claims priority to a Chinese patent application filed with the Chinese Patent Office on May 06, 2023, with application number 202310506113.8 and application title "Power Assembly and Surface Cleaning Equipment", and all of its contents are incorporated herein by reference.

[0002] This application relates to the technical field of cleaning equipment, specifically to a power assembly and a surface cleaning equipment.

Background Art

[0003] In recent years, with the development of science and technology, various cleaning supplies have been continuously developed. These cleaning supplies reduce the burden of people's cleaning work, meet people's needs, and bring great convenience to life.

[0004] The negative - pressure fan generates noise during the working process. Conventional fan noise reduction methods include soft - rubber vibration absorption, sound - absorbing cotton sound absorption, etc. These methods have limited noise reduction effects, and still sharp noises remain, affecting the user experience.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The objective of this application is to provide a power assembly and a surface cleaning equipment that reduce the noise of the fan in the power assembly.

Means for Solving the Problems

[0006] The embodiments of this application provide a power assembly, a power source configured to provide fluid power, and a sound - proof chamber provided around the power source and configured to have an axial depth and a radial depth. The radial depth is configured to silence the noise in the first frequency range, and the axial depth is configured to silence the noise in the second frequency range. The axial depth is 20 mm or more and 120 mm or less.

[0007] In some embodiments, the power assembly is The system further includes a sound-absorbing cover provided around the power source and configured to have a perforated plate and an outer wall, wherein the sound-absorbing chamber is located between the perforated plate and the outer wall.

[0008] In some embodiments, the diameter of the holes in the perforated plate is 1 mm or more and 5 mm or less.

[0009] In some embodiments, the number of holes in the perforated plate is 100 or more and 1400 or less.

[0010] In some embodiments, the distance from the perforated plate to the central axis of the sound-absorbing cover is 20 mm or more and 55 mm or less.

[0011] In some embodiments, the thickness of the perforated plate is 1 mm or more and 4 mm or less.

[0012] In some embodiments, the radial depth of the sound-absorbing chamber is 3 mm or more and 15 mm or less.

[0013] In some embodiments, the cross-section of the soundproofing chamber is U-shaped.

[0014] In some embodiments, the U-shaped structure does not have sound-dampening holes at its bottom.

[0015] In some embodiments, the sound-dampening cover is The perforated plate further includes an assembly bracket provided on the inside, and the sound-absorbing cover is configured to be fixed by the assembly bracket.

[0016] In some embodiments, the first frequency range is 3000 Hz or higher and 8000 Hz or lower, and the second frequency range is 500 Hz or higher and 3200 Hz or lower.

[0017] In some embodiments, the rotational speed of the power source is 70,000 r / min or more and 90,000 r / min or less.

[0018] In some embodiments, the plurality of holes in the porous plate are uniformly distributed on the porous plate.

[0019] The embodiments of the present application provide a surface cleaning device including the power assembly according to any one of the above items.

[0020] The embodiments of the present application provide a power assembly, a housing having an air outlet and a water outlet, a power source located within the housing and configured to provide fluid power, a soundproof cover provided between the power source and the housing and having a porous plate and an outer wall, Here, water vapor in the working air flow condenses into liquid on the porous plate and / or the outer wall and is then discharged from the water outlet, and the working air flow that does not condense into liquid is discharged from the air outlet.

[0021] In some embodiments, the air outlet is located on the side surface of the housing, and the water outlet is located on the bottom surface of the housing.

[0022] In some embodiments, the power assembly includes a first air flow path communicating from the air outlet of the fan to the bottom of the soundproof cover, a second air flow path communicating from the bottom of the soundproof cover to the air outlet of the housing, Here, in response to the activation of the power source, the working air flow is discharged after sequentially passing through the power source, the first air flow path, the second air flow path, and the air outlet.

[0023] In some embodiments, the first air flow path has a path extending downward from the air outlet of the fan along the inner wall of the porous plate to the bottom of the soundproof cover.

[0024] In some embodiments, the first air flow path enters from the air outlet of the fan along the porous plate between the porous plate and the outer wall, turns back at the outer wall and exits from the porous plate, and has a path extending downward along the inner wall of the porous plate to the bottom of the sound-absorbing cover.

[0025] In some embodiments, the second air flow path has a path extending upward from the bottom of the sound-absorbing cover along the outer periphery of the outer wall to the air outlet of the housing.

[0026] In some embodiments, the cross-section formed by the porous plate and the outer wall is a U-shaped communication structure.

[0027] In some embodiments, the bottom surface of the U-shaped communication structure includes at least one water discharge hole.

[0028] In some embodiments, the sound-absorbing cover is provided inside the porous plate and further includes a semi-transparent assembly bracket configured to allow the working air flow or condensed water to pass through.

[0029] The embodiments of the present application provide a surface cleaning device including the power assembly according to any one of the above items.

Brief Description of the Drawings

[0030] The accompanying drawings here are incorporated into the specification and form a part of the specification, showing embodiments applicable to the present disclosure, and are used together with the specification to interpret the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and those skilled in the art can obtain other drawings based on these accompanying drawings without creative labor.

[0031] [Figure 1] It is a schematic diagram of the overall structure of the power assembly of some embodiments of the present application. [Figure 2]This is a schematic diagram of the cross-sectional structure of a power assembly in some embodiments of this application. [Figure 3] This is a schematic diagram of the water flow path structure of several embodiments of the power assembly in this application. [Figure 4] This is a schematic diagram of the water flow path structure of a power assembly in some other embodiments of this application. [Figure 5] This is a schematic diagram of the structure of the airflow path of a power assembly in some embodiments of this application. [Figure 6] This is a schematic diagram of the structure of the airflow path of a power assembly in some other embodiments of this application. [Figure 7] This is a schematic diagram of the overall structure of several embodiments of the sound-absorbing cover of this application. [Figure 8] This is a schematic diagram of the cross-sectional structure of several embodiments of the sound-absorbing cover in this application. [Figure 9] This is a schematic diagram of the cross-sectional structure of several embodiments of the present application. [Modes for carrying out the invention]

[0032] To further clarify the purpose, technical solutions, and advantages of this application, the application will be described in more detail below with reference to the accompanying drawings, although obviously the embodiments described are only a selection of the embodiments of this application, not all of them. Any other embodiments that can be obtained by a person skilled in the art without any creative work based on the embodiments of this application are all included in the scope of protection of this application.

[0033] The terms used in the embodiments of this application are used solely for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms “one kind,” “the said,” and “the” used in the embodiments and appended claims of this application are intended to include plural forms unless otherwise clearly indicated in the context, and “plural” generally includes at least two.

[0034] It should be noted that the terms "and / or" used herein merely describe the relationship between related objects, and there are three possible relationships. For example, A and / or B can refer to three cases: A existing alone, A and B existing together, or B existing alone. Furthermore, the letter " / " in this specification generally indicates that the preceding and succeeding related objects have an "or" relationship.

[0035] Furthermore, while terms such as first, second, third, etc. are used descriptively in the embodiments of this application, they are not limiting. These terms are used solely for distinction. For example, the first may also be called the second, and similarly, the second may also be called the first, as long as it does not deviate from the scope of the embodiments of this application.

[0036] Furthermore, the terms “equipped with,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, and a product or apparatus comprising a set of elements may also include, in addition to those elements, other elements not explicitly listed, or elements specific to such product or apparatus. Unless further restrictions are placed on it, an element limited by the expression “equipped with one…” is not excluded from including other similar elements in the product or apparatus of the said element.

[0037] Selectable embodiments of this application will be described in detail below with reference to the attached drawings. The main assembly of surface cleaning equipment provides suction force for the cleaning equipment's operation, and the working airflow enters the main assembly before being discharged. In this process, some water vapor enters the main assembly along with the working airflow. In related technologies, the water vapor is discharged from the air outlet of the main assembly along with the working airflow, but complete discharge may not be possible. As a result, some water vapor accumulates inside the main assembly, and if it accumulates for a long period of time, it may affect the service life of the main assembly.

[0038] Embodiments of this application provide a power assembly comprising a housing having an air outlet and a water outlet; a power source located within the housing and configured to provide working fluid power; and a sound-absorbing cover provided between the power source and the housing and having a perforated plate and an outer wall, wherein a working airflow containing water vapor condenses on the perforated plate and / or the outer wall and is then discharged from the water outlet.

[0039] The power assembly provided in the embodiment of this application has a drainage path and an exhaust path, and after the working airflow enters from the fan air inlet, the water contained therein condenses on the mesh plate of the sound-absorbing cover and / or the outer wall of the sound-absorbing cover, flows down along the wall surface under the effect of gravity, and flows out from the water outlet, and the separated gas is discharged from the air outlet, thereby the power assembly can separate water vapor from the working airflow that enters the fan and at the same time discharge gas and water from the power assembly, thereby optimizing the use of the power assembly.

[0040] Specifically, the embodiments of this application provide a power assembly, and as an example, Figure 1 is a schematic diagram of the overall structure of a power assembly of several embodiments of this application. Figure 2 is a schematic diagram of the cross-sectional structure of a power assembly of several embodiments of this application.

[0041] To more clearly explain the behavior of the power assembly, the following directions are defined as shown in Figure 1: The power assembly is calibrated by three mutually perpendicular axes: the lateral axis Y, the longitudinal axis X, and the central vertical axis Z. The central vertical axis Z is the axial direction of the power assembly, and the direction perpendicular to the axial direction is the radial direction, which lies in the XY plane, where the direction opposite to the arrow along the longitudinal axis X is indicated as "rear," and the direction of the arrow along the longitudinal axis X is indicated as "forward." The direction of the arrow along the lateral axis Y is the "left side" of the power assembly, and the opposite direction of the arrow along the lateral axis Y is the "right side" of the power assembly. The vertical axis Z is the direction extending upward along the bottom surface of the power assembly, the direction of the arrow along the vertical axis Z is the "upper side" of the power assembly, and the opposite direction of the arrow along the vertical axis Z is the "lower side" of the power assembly.

[0042] Specifically, as shown in Figures 1 and 2, embodiments of the present application provide a power assembly 100 configured to provide power for cleaning work, the power assembly 100 includes a housing 10 which may be columnar, for example cylindrical, and the housing 10 has an air outlet 11 and a water outlet 12, the air outlet 11 is used to discharge a substantially dry airflow in the working airflow and the water outlet 12 is used to discharge water vapor mixed in the working airflow, the power assembly 100 further includes a power source 20 which is located inside the housing 10 and the power source 20 provides fluid power The power assembly 100 is configured to provide a power source 20 which is specifically a suction source, such as a fan, and has an air inlet 21 and an air outlet 22. The power assembly 100 further includes a sound-dampening cover 30 which is provided between the power source 20 and the housing 10 and is used to reduce noise generated during the flow process of the working airflow. The sound-dampening cover 30 includes a perforated plate 31 and an outer wall 32, where the working airflow containing water vapor condenses into a liquid on the perforated plate 31 and / or the outer wall 32 and is discharged from the water outlet 12, and the working airflow that does not condense into a liquid is discharged from the air outlet 11. The condensed water is discharged immediately from the water outlet, and the power assembly can be kept substantially free of residual water, thereby extending the service life of the power assembly and preventing wastewater from being discharged from the air outlet and polluting the environment.

[0043] Figure 3 is a schematic diagram of the water flow path structure of a power assembly in several embodiments of this application. Figure 4 is a schematic diagram of the water flow path structure of a power assembly in several other embodiments of this application. As shown in Figure 3, the arrows in Figure 3 schematically indicate the flow direction of the working airflow. The working airflow containing water vapor enters from the air inlet 21 of the power source 20 and is discharged from the air outlet 22 of the power source 20. When the intensity of the working airflow is low, the working airflow is obstructed by the perforated plate 31, and after the working airflow containing water vapor condenses on the perforated plate 31, it flows down along the perforated plate 31 and is finally discharged from the water outlet 12 on the bottom of the housing 10. As shown in Figure 4, the arrows in Figure 4 schematically indicate the flow direction of the working airflow. The working airflow containing water vapor enters from the air inlet 21 of the power source 20 and is discharged from the air outlet 22 of the power source 20. When the intensity of the working airflow is sufficiently high, the working airflow passes through the perforated plate 31, and due to obstruction by the outer wall 32, the working airflow containing water vapor condenses on the outer wall 32 and flows down along the outer wall 32 and is finally discharged from the water outlet 12 on the bottom of the housing 10. In some embodiments, a portion of the working airflow containing water vapor flows down along the perforated plate 31 and a portion flows down along the outer wall 32, where condensed water is formed in the two portions and then discharged from the water outlet 12 at the bottom of the housing 10.

[0044] In some embodiments, as shown in Figure 1, the air outlet 11 of the housing 10 is located on the side of the housing and can be selected to be positioned at a predetermined height from the bottom of the housing 10, for example, at 1 / 3 of the height of the housing, thereby preventing impurities from entering the housing if the height of the air outlet is too low. At the same time, the water outlet 12 is located on the bottom of the housing 10, and the water flow condenses and collects on the perforated plate 31 and / or the outer wall 32, and is then discharged from the water outlet 12 on the bottom of the housing, thereby preventing water from accumulating inside the housing. There are multiple air outlets 11, and the shape of each air outlet 11 is a strip-like structure that extends substantially along the axial direction, for example, rectangular, track-shaped, or elliptical, and the strip-like structure of the air outlet coincides with the flow direction of the working airflow, which is advantageous for airflow discharge.

[0045] Figure 5 is a schematic diagram of the structure of the airflow path of a power assembly in some embodiments of the present application. Figure 6 is a schematic diagram of the structure of the airflow path of a power assembly in some other embodiments of the present application. In some embodiments, as shown in Figure 5, the arrows in Figure 5 schematically indicate the flow direction of the working airflow, the power assembly 100 further includes a first airflow path, the first airflow path communicating from the air outlet 22 of the fan to the bottom of the sound-dampening cover 30, the space between the bottom of the sound-dampening cover 30 and the bottom surface of the housing is perforated, the perforated structure allows the working airflow to pass through, and the first airflow path described in this embodiment refers to the flow path of the airflow from the air outlet 22 of the fan to the bottom of the sound-dampening cover 30. In some embodiments, as shown in Figure 5, the first air passage has a path that extends downward from the fan's air outlet 22 along the inner wall of the perforated plate 31 to the bottom of the sound-absorbing cover 30, that is, after the working airflow exits the fan's air outlet, if the intensity of the working airflow is low, the working airflow is obstructed by the perforated plate and flows mainly downward along the inner wall of the perforated plate to the perforated structure at the bottom of the sound-absorbing cover. In some embodiments, as shown in Figure 6, the arrows in Figure 6 schematically indicate the direction of the working airflow, and the first air passage has a path that enters between the perforated plate 31 and the outer wall 32 along the perforated plate 31 from the fan's air outlet 22, turns back at the outer wall 32 to reach the perforated plate 31, and extends downward along the inner wall of the perforated plate 31 to the bottom of the sound-absorbing cover 30. In other words, after the airflow is blown out from the air outlet 22 of the fan, if the airflow strength is sufficiently high, the airflow enters the space between the perforated plate 31 and the outer wall 32 through the holes in the perforated plate 31, is then reflected by the outer wall 32, moves downward for a certain distance along the outer wall 32, then folds back into the perforated plate 31, and further extends downward along the inner wall of the perforated plate 31 to the bottom of the sound-absorbing cover 30. Selectively, the two first airflow paths do not necessarily have to exist independently and may intersect in some cases, but the basic direction is to move downward after exiting the air outlet.

[0046] The arrows in Figures 5 and 6 schematically indicate the flow direction of the working airflow. The power assembly 100 further has a second airflow channel, which communicates from the bottom of the sound-absorbing cover 30 to the air outlet 11 of the housing 10. Specifically, the second airflow channel has a path that extends upward from the bottom of the sound-absorbing cover 30 along the outer circumference of the outer wall 32 to the air outlet 11 of the housing 10. After the working airflow reaches the bottom of the sound-absorbing cover 30 via the first airflow channel, it passes through the perforated structure at the bottom of the sound-absorbing cover 30 and reaches the gap between the sound-absorbing cover 30 and the housing 10, and the working airflow moves upward along the gap until it is discharged from the air outlet 11 of the housing 10.

[0047] In response to the activation of the power source 20, the power assembly 100 discharges the working airflow after it has passed sequentially through the power source 20, the first airflow path, the second airflow path, and the air outlet 11, thereby completing the discharge of the working airflow, which is almost entirely free of water vapor.

[0048] Figure 7 is a schematic diagram of the overall structure of a sound-absorbing cover according to some embodiments of this application. Figure 8 is a schematic diagram of the cross-sectional structure of a sound-absorbing cover according to some embodiments of this application. In some embodiments, as shown in Figures 7 and 8, the structure of the sound-absorbing cover 30 is substantially columnar, the perforated plate 31 and the outer wall 32 constitute a two-layer side wall, the two-layer side wall has an open top, the perforated plate 31 and the outer wall 32 constitute a communication structure at the bottom, forming a U-shaped cross-sectional communication structure. The perforated plate 31 has a plurality of through holes 311, which allow the working airflow to pass through.

[0049] In some embodiments, as shown in Figure 8, the bottom surface of the U-shaped communication structure includes at least one discharge hole 312, and the working airflow containing water vapor condenses on the outer wall 32 and flows down along the outer wall 32, then flows out from the sound-dampening cover 30 through the discharge hole 312, reaches the bottom surface of the housing 10, and is discharged from the water outlet 12.

[0050] In some embodiments, as shown in Figure 8, the sound-absorbing cover 30 further includes a perforated assembly bracket 313, which is located inside the perforated plate 31, and the sound-absorbing cover 30 is assembled to the bottom surface of the housing 10 via the assembly bracket 313, the assembly bracket 313 being perforated and used to allow working airflow or condensed water to pass through, and the assembly bracket 313, perforated plate 31 and outer wall 32 are optionally molded integrally.

[0051] Embodiments of this application provide a surface cleaning device comprising the power assembly described in any one of the above paragraphs.

[0052] The power assembly provided in the embodiment of this application has a drainage path and an exhaust path. After the working airflow enters from the fan air inlet, the moisture contained therein condenses on the sound-absorbing cover mesh plate and / or the outer wall of the sound-absorbing cover, flows down along the wall surface under the effect of gravity, and flows out from the water outlet. The separated gas is discharged from the air outlet, thereby the power assembly can separate water vapor from the working airflow entering the fan and simultaneously discharge gas and water from the power assembly, optimizing the use of the power assembly.

[0053] Fans generate noise during operation, and conventional methods for reducing fan noise include soft rubber vibration absorption and sound-absorbing cotton. However, these methods have limited noise reduction effects, and some sharp noise remains. Related technologies can employ single-layer perforation for noise reduction, but perforation noise reduction can only reduce some of the noise, and the remaining noise still affects the user experience.

[0054] Embodiments of the present application include a power source configured to provide a power assembly and fluid power, and a sound-dampening chamber provided around the power source, the sound-dampening chamber having an axial depth and a radial depth, wherein the radial depth is configured to dampen noise in a first frequency range, and the axial depth is configured to dampen noise in a second frequency range, wherein the axial depth is 20 mm or more and 120 mm or less.

[0055] The power assembly provided in the embodiment of this application includes a sound-dampening chamber, which has an axial depth and a radial depth, with an axial depth of 20 mm or more and 120 mm or less. The sound-dampening chamber of this application, through a combination of axial and radial sound dampening, particularly with an axial depth of 20 mm or more and 120 mm or less, dampens noise in the range of 500 Hz or more and 3200 Hz or less, ultimately achieving a sound-dampening effect in the range of 500 to 8000 Hz, which almost covers the noise frequencies of existing household handheld appliances and can improve the user experience.

[0056] Specifically, the embodiment of this application provides a power assembly 100, and the related structure of the power assembly 100 is the same as the structure of the above embodiment. Since similar structures have similar functions and technical effects, some aspects of this embodiment will not be explained redundantly. As shown in Figures 1 and 9, the power assembly 100 includes a housing 10 and a power source 20, the housing 10 may be columnar, for example cylindrical, and is used to house related devices, such as circuit control boards, etc., the housing is usually made of metal, alloy, plastic or other organic material, the power source 20 is located inside the housing 10 and is approximately on the central axis of the housing 10, the power source 20 is used to provide working power, working airflow enters from the air inlet 21 of the power source 20 and is discharged from the air outlet 22, the power source 20 is specifically a suction source, for example a fan, the power source 20 rotates at a constant rotational speed with an adjustable output to output power, for example the rotational speed of the power source is 70,000 r / min or more and 90,000 r / min or less, the power assembly 100 further includes a silencing chamber 34, the silencing chamber 34 is approximately on the central axis, and the housing 10 and power around the power source 20 The sound-dampening chamber 34 is provided between the power sources 20, and the working airflow is discharged from the air outlet 22 of the power source 20 and to the outside of the power assembly 100 via the housing air outlet 11. In this path, working noise is generated by the flow of the working airflow, and the sound-dampening chamber 34 can significantly reduce the noise during this process. Specifically, the sound-dampening chamber 34 has an axial depth and a radial depth, the radial depth is configured to silence noise in a first frequency range, and the axial depth is configured to silence noise in a second frequency range. For example, the first frequency range is 3000 or more and 8000 Hz or less, and the second frequency range is 500 or more and 3200 Hz or less. Here, the axial depth is 20 or more and 120 mm or less. With a sound-dampening chamber structure having an axial depth of 20 or more and 120 mm or less, noise in the range of 500 or more and 3200 Hz or less can be silenced, and noise in the range of 3000 or more and 8000 Hz or less can be silenced by the radial depth.

[0057] In some embodiments, as shown in Figure 7, the power assembly 100 further includes a sound-dampening cover 30, which is provided around the power source, for example, the sound-dampening cover 30 is provided between the power source 20 and the housing 10, and the sound-dampening cover 30 includes a perforated plate 31 and an outer wall 32, where the sound-dampening chamber 34 is located between the perforated plate 31 and the outer wall 32, i.e., the sound-dampening cover 30 is a columnar structure having a two-layer structure, a sound-dampening chamber is formed between the two layers, the sound-dampening chamber forms a communication structure around a central axis, the sound-dampening chamber has an axial depth and a radial depth, the axial depth is substantially the distance from the bottom to the top of the sound-dampening chamber and is approximately equivalent to the height of the perforated plate 31 or the outer wall 32, and the radial depth is the distance between the perforated plate 31 and the outer wall 32. The holes in the perforated plate 31 are generally uniformly distributed across the entire columnar surface of the perforated plate 31, which is convenient for circulating the working airflow, advantageous for uniform noise reduction, and the size of the hole diameters is almost uniform, thus reducing the difficulty of processing.

[0058] In some embodiments, the cross-section of the sound-absorbing chamber has a U-shaped structure. The bottom of the U-shaped structure has no sound-absorbing holes, only a few water discharge holes, and sufficient sound wave reflection occurs at the bottom of the U-shaped structure, resulting in axial sound absorption.

[0059] The working airflow generated by the power source 20 is propagated to the outside through the perforated plate 31. The specific airflow propagation path can be found in the above embodiments and will not be repeated here. During the airflow propagation process, noise of various frequencies is generated. As the sound passes through the perforated plate 31, filtration and sound silencing are achieved, that is, sound in a specific frequency range is filtered. The filtration and sound silencing effect depends on the density of the holes (i.e., the number of holes per unit area), the diameter of the holes, and the thickness of the perforated plate. Here, the higher the density of the holes, the higher the sound silencing frequency band, and the higher the thickness of the perforated plate, the lower the sound silencing frequency band.

[0060] As shown in regions A and B of Figure 9, after sound passes through the perforated plate 31 and enters the sound-dampening chamber 34, reflection and refraction propagation of sound occurs between the outer wall 32 of the sound-dampening chamber 34 and the perforated plate 31. The incident sound wave and the reflected sound wave overlap, producing a sound-dampening effect. When the phase difference of the overlapping incident sound wave and the reflected sound wave reaches 180 degrees, maximum sound dampening is achieved. Therefore, rationally controlling the radial depth and axial depth of the sound-dampening chamber affects the sound-dampening effect.

[0061] In some embodiments, after sound enters the sound-dampening chamber 34, the sound waves propagate and reflect in the axial and radial directions of the sound-dampening chamber 34 and overlap, attenuating the total sound energy and achieving a sound-dampening effect. Here, as shown in region B of Figure 9, the processes of radial reflection sound-dampening and porous filtration sound-dampening are interrelated, and sound-dampening in the frequency band of approximately 3000Hz to 8000Hz can be effectively achieved. Experimental verification has shown that when the radial depth of the sound-dampening chamber is 3 or more and 15 mm or less, noise in the frequency band of 3000Hz to 8000Hz can be effectively removed, and selectable radial depths include 5 mm, 8 mm, 10 mm, 12 mm, etc.

[0062] However, with the radial depth described above, noise in the mid-to-low frequency band below 3000Hz cannot be silenced. By rationally controlling the axial depth parameter, axial reflection silencer can silence noise in the mid-to-low frequency band below 3000Hz. As shown in region A of Figure 9, sound is reflected and refracted by the outer wall 32 of the silencer chamber, the perforated plate 31, and the bottom surface of the silencer chamber, forming a propagation method that overlaps with each other along the axial direction of the silencer chamber. This effectively removes noise in the mid-to-low frequency band below approximately 3000Hz. Experimental verification has shown that when the axial depth of the silencer chamber is 20mm or more and 120mm or less, noise in the mid-to-low frequency band below 3000Hz, for example, noise in the frequency band between 500Hz and 3200Hz, or between 1000Hz and 3000Hz, can be effectively removed. Here, selectable axial depths are 25mm or more and 80mm or less, for example, 40mm, 50mm, 60mm, 70mm, etc.

[0063] As described above, sound waves undergo radial and axial damping in a porous sound-dampening chamber, and through several overlapping damping processes, the total energy of sound in a specific frequency band (e.g., 500Hz to 8000Hz) is attenuated, thereby achieving the final sound-dampening effect.

[0064] When a fan operates at a rotational speed range of 70,000 r / min or more and 90,000 r / min or less, for example, if the operating speed is 72,000 r / min, the frequency range of the sound corresponding to the fan's rotation is approximately 1150 Hz or more and 3200 Hz or less, and this can be calculated using the following method:

[0065] The sound frequency corresponding to the rotational speed is equal to the shaft frequency, which is equal to the operating frequency. For example, if the operating rotational speed is 72,000 r / min, the calculation is 72,000 / 60 = 1333 turns / second = 1200 Hz, which falls into the mid-to-low frequency band.

[0066] If the fan's operating speed range is outside this range, it will generate noise in a higher frequency range. In the case of conventional power assemblies, the noise range of the fan is usually between 500Hz and 8000Hz. Therefore, the sound-dampening chamber of this application can cover the entire operating speed range of a normal fan.

[0067] Experimental verification has shown that when reducing noise in the mid-to-low frequency range below 3000 Hz by adjusting the thickness of the perforated plate, the density of the holes, the diameter of the holes, or the radial dimensions of the sound-absorbing chamber, the following conditions must be met: Firstly, pore size and pore density jointly affect the ratio of the total area of ​​pores within a unit area of ​​the perforated plate. To achieve noise reduction in the low-frequency range, the pore size should not be too large, and at the same time, the pore density should be very low, with the ratio of the total area of ​​pores not exceeding 3%. However, such parameter settings significantly hinder the airflow of the power assembly and adversely affect the main function of the fan (negative pressure performance). Therefore, with normal pore size and pore density, it is not possible to reduce noise in the mid-to-low frequency range below 3000Hz.

[0068] Secondly, in order to silence noise in the mid-to-low frequency band below 3000Hz, the radial dimension of the sound-dampening chamber needs to be 20mm or more. However, this results in an excessively large radial dimension for the sound-dampening cover and an excessively large outer diameter for the power assembly, making it unsuitable for household handheld appliances. Therefore, even with normal radial dimensions, it is not possible to silence noise in the mid-to-low frequency band below 3000Hz.

[0069] Third, in order to silence noise in the mid-to-low frequency band below 3000Hz, the thickness of the perforated plate needs to be at least 7mm. However, perforated plates that are too thick cannot be molded by injection molding, and when manufacturing a cylindrical perforated plate with a uniform hole diameter, it becomes extremely difficult to manufacture if the thickness exceeds 7mm. Furthermore, a perforated plate that is too thick increases the weight of the sound-dampening cover and the power assembly, affecting the user experience. Therefore, even with a typical thickness of perforated plate, it is not possible to silence noise in the mid-to-low frequency band below 3000Hz.

[0070] Therefore, due to practical application constraints, the main parameters affecting the sound-dampening effect of the above-mentioned sound-dampening cover can only remove noise between 3000 and 8000 Hz. Accordingly, in order to satisfy multifaceted needs such as smoothness of working airflow, power assembly dimensions, and simplification of the manufacturing process, the parameter settings for the perforated plate in the embodiment of this application are as follows: The diameter of the holes in the perforated plate is 1 mm or more and 5 mm or less, with selectable options such as 2 mm or 3 mm. The number of holes in the perforated plate is 100 or more and 1400 or less, with selectable options such as 1058 or 1200. The distance from the perforated plate to the central axis of the sound-dampening cover is 20 mm or more and 55 mm or less, with selectable options such as 30 mm, 37 mm, or 45 mm. The thickness of the perforated plate is 1 mm or more and 4 mm or less, with selectable options such as 1.5 mm, 2 mm, or 3 mm. As described above, the sound-absorbing cover of the embodiment of this application is limited by the above parameters, can effectively remove noise between 3000Hz and 8000Hz, and does not affect the actual application or manufacturing process of the sound-absorbing cover.

[0071] Considering the limitations of parameter adjustment in the actual application of filtration noise reduction and radial reflection noise reduction of the sound-absorbing cover, by combining the axial depth parameter, it is possible to reduce noise above 500 Hz and below 3200 Hz, and overall reduce noise in the range of approximately 500 to 8000 Hz.

[0072] As shown in region C of Figure 9, when the working airflow flows up and down the inner wall of the perforated plate 31, the sound is reflected and refracted by the perforated plate 31 and the bottom surface of the housing, forming a propagation method in which the sound generally overlaps along the axial direction of the perforated plate 31. This complements the axial sound dampening within the sound-dampening chamber and effectively eliminates noise in the mid-to-low frequency band below approximately 3000 Hz. Experimental verification has shown that when the axial height of the perforated plate 31 is 20 mm or more and 120 mm or less, it has a complementary effect on noise removal in the mid-to-low frequency band below 3000 Hz, and can dampen noise in frequency bands such as 500 Hz or more and 3200 Hz or 1000 Hz or more and 3000 Hz or less. Here, the selectable axial heights are 25 mm or more and 80 mm or less, for example, 40 mm, 50 mm, 60 mm, 70 mm, etc.

[0073] The power assembly provided in the embodiment of this application includes a sound-dampening chamber, which has an axial depth and a radial depth. The radial depth is configured to dampen noise in a first frequency range, for example, noise in the range of 3000 Hz or higher and 8000 Hz or lower. Combined with parameters such as the diameter, number, and thickness of the perforated plate, it can further dampen noise in the range of 3000 Hz or higher and 8000 Hz or lower. At the same time, the axial depth of the sound-dampening chamber is 20 mm or more and 120 mm or less. The axial depth is configured to dampen noise in a second frequency range, for example, noise in the range of 500 to 3000 Hz. Therefore, the sound-dampening chamber of this application, through a combination of axial and radial damping, achieves a sound-dampening effect in the range of 500 to 8000 Hz, covering the noise frequencies of existing household handheld appliances.

[0074] Finally, note that each example in this specification is described incrementally, each example focuses on its differences from the others, and identical or similar parts between examples may be referenced to one another.

[0075] The above embodiments are used to illustrate the technical solutions of this application and are not limiting; although this application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in each of the above embodiments can still be modified or some of their technical features can be replaced with equivalents, and that such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of each embodiment of this application. [Explanation of Symbols]

[0076] 100 Power Assembly 10 Housing 11 Air outlet 12 water outlet 20 Power source 21 Air Inlet 22 Air outlet 30 Sound-dampening cover 31 Perforated plate 32 Outer wall 311 Through hole 312 Water outlet 313 Assembly Bracket 34 Sound deadening room

Claims

1. A power source configured to provide fluid power, The system includes a sound-dampening chamber provided around the power source and configured to have an axial depth and a radial depth, wherein the radial depth is configured to dampen noise in a first frequency range, and the axial depth is configured to dampen noise in a second frequency range. A power assembly in which the axial depth is 20 mm or more and 120 mm or less.

2. The aforementioned power assembly is The power assembly according to claim 1, further comprising a sound-dampening cover provided around the power source and configured to have a perforated plate and an outer wall, wherein the sound-dampening chamber is located between the perforated plate and the outer wall.

3. The power assembly according to claim 2, wherein the diameter of the holes in the perforated plate is 1 mm or more and 5 mm or less.

4. The power assembly according to claim 2, wherein the number of holes in the perforated plate is 100 or more and 1,400 or less.

5. The power assembly according to claim 2, wherein the distance from the perforated plate to the central axis of the sound-absorbing cover is 20 mm or more and 55 mm or less.

6. The power assembly according to claim 2, wherein the thickness of the perforated plate is 1 mm or more and 4 mm or less.

7. The power assembly according to claim 1, wherein the radial depth of the sound-dampening chamber is 3 mm or more and 15 mm or less.

8. The power assembly according to claim 1, wherein the cross-section of the sound-dampening chamber has a U-shaped structure.

9. The power assembly according to claim 8, wherein the bottom of the U-shaped structure does not have a sound-dampening hole.

10. The sound-dampening cover is The power assembly according to claim 2, further comprising an assembly bracket provided on the inside of the perforated plate, wherein the sound-dampening cover is configured to be fixed by the assembly bracket.

11. The power assembly according to claim 1, wherein the first frequency range is 3000 Hz or more and 8000 Hz or less, and the second frequency range is 500 Hz or more and 3200 Hz or less.

12. The power assembly according to claim 1, wherein the rotational speed of the power source is 70,000 r / min or more and 90,000 r / min or less.

13. The power assembly according to claim 2, wherein the plurality of holes in the perforated plate are uniformly distributed in the perforated plate.

14. A surface cleaning device comprising a power assembly according to any one of claims 1 to 13.

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