Power assemblies and surface cleaning equipment

Abstract

The present invention provides a power assembly (100) and a surface cleaning device, the power assembly (100) comprising a housing (10) including an air outlet (11) and a drain (12), a power source (20) located within the housing (10) and configured to provide fluid power, and a sound-dampening cover (30) provided between the power source (20) and the housing (10) and comprising a perforated plate (31) and an outer wall (32), wherein water vapor in the working airflow condenses into liquid on the perforated plate (31) and / or the outer wall (32) and is then discharged from the drain (12), and the working airflow that has not condensed into liquid is discharged from the air outlet (11). The motor assembly has drain and exhaust paths, allowing for moisture separation of the working airflow entering the fan and enabling the discharge of gas and water from the motor assembly, optimizing the use of the motor assembly.

Description

Related Applications

[0001] This disclosure claims the priority of Chinese Patent Application No. 202321078623.1 filed on May 6, 2023, and all the contents of this Chinese patent application are incorporated herein by reference.

Technical Field

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

Background Art

[0003] In recent years, with the development of science and technology, various cleaning devices, especially wet surface cleaning devices, such as floor washers, have been developed one after another. These cleaning devices reduce the burden of people's cleaning work, meet people's needs, and bring great convenience to life. Since wet cleaning devices usually suck in a large amount of liquid during operation, water vapor is likely to invade the power assembly. If it is not discharged immediately, damage to the power assembly and contamination of the shell will occur. As a result, sewage accumulates in the housing, and if left for a long time, there may be a bad smell, which will affect the user experience.

Summary of the Invention

[0004] The purpose of this application is to provide a power assembly and a surface cleaning device that can immediately discharge the water vapor that has invaded the power assembly.

[0005] The embodiment of this application provides a power assembly, a housing including an air outlet and a drain port, a power source located within the housing and configured to provide fluid power, a soundproof cover provided between the power source and the housing, including a perforated plate and an outer wall, The water vapor in the working air flow condenses into liquid on the perforated plate and / or the outer wall and then is discharged from the drain port, and the working air flow that has not condensed into liquid is discharged from the air outlet.

[0006] In some embodiments, the air outlet is located on the side of the housing, and the drain is located on the bottom of the housing.

[0007] In some embodiments, the power assembly is A first air passage is provided, which is connected from the air outlet of the fan to the bottom of the sound-dampening cover. The present invention further includes a second air passage that communicates from the bottom of the sound-dampening cover to the air outlet of the housing, In response to the activation of the power source, the working airflow is discharged sequentially through the power source, the first airflow path, the second airflow path, and the air outlet.

[0008] In some embodiments, the first air passage is The air outlet of the fan includes a path that extends downward along the inner wall of the perforated plate to the bottom of the sound-absorbing cover.

[0009] In some embodiments, the first air passage is The air outlet of the fan includes a path that enters between the perforated plate and the outer wall along the perforated plate, folds back through the outer wall and exits the perforated plate, and extends downward along the inner wall of the perforated plate to the bottom of the sound-dampening cover.

[0010] In some embodiments, the second air passage is This includes a path extending upward from the bottom of the sound-absorbing cover along the outer circumference of the outer wall to the air outlet of the housing.

[0011] In some embodiments, the perforated plate and the outer wall form a connecting structure with a U-shaped cross-section.

[0012] In some embodiments, the bottom surface of the U-shaped connecting structure includes at least one drainage hole.

[0013] In some embodiments, the sound-dampening cover is The system further includes a hollow assembly bracket provided inside the perforated plate and configured to allow an operating airflow or condensed water to pass through.

[0014] Embodiments of this application provide a surface cleaning device comprising the power assembly described in any one of the above paragraphs. [Brief explanation of the drawing]

[0015] The accompanying drawings are incorporated into this specification and constitute part of this specification, illustrating embodiments applicable to this disclosure and are used together with the specification to interpret the principles of this disclosure. Clearly, the accompanying drawings described below are only a few embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these accompanying drawings without any creative work. In the accompanying drawings, [Figure 1] This is a schematic diagram of the overall structure of a motor assembly according to some embodiments of this application. [Figure 2] This is a schematic diagram of the cross-sectional structure of a motor assembly according to several embodiments of this application. [Figure 3] This is a schematic diagram of the water flow path structure of a motor assembly in several embodiments of this application. [Figure 4] This is a schematic diagram of the water flow path structure of a motor assembly in some other embodiments of this application. [Figure 5] This is a schematic diagram of the structure of the airflow path of a motor assembly in some embodiments of this application. [Figure 6] This is a schematic diagram of the structure of the airflow path of a motor 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. [Explanation of Symbols]

[0016] 100 Power assembly 10 Housing 11 Air outlet 12 Drain outlet 20 Power source 21 Air inlet 22 Air outlet 30 Soundproof cover 31 Perforated plate 32 Outer wall 311 Through hole 312 Drain hole 313 Assembly bracket 34 Soundproof chamber

Best Mode for Carrying Out the Invention

[0017] To make the objectives, technical solutions and advantages of this application clearer, the following will further describe this application in more detail with reference to the accompanying drawings. Clearly, the described embodiments are only some of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative labor are included in the protection scope of this application.

[0018] The terms used in the embodiments of this application are only used for the purpose of explaining specific embodiments and are not intended to limit this application. The singular forms "a kind", "the above-mentioned" and "said" used in the embodiments of this application and the appended patent claims are intended to include the plural forms unless otherwise clearly indicated in the context. "Plural" generally includes at least two.

[0019] Note that the term "and / or" used in this specification only explains the relationship between related objects, and it should be understood that there are three relationships. For example, A and / or B may have three cases: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " in this specification generally means that the related objects before and after have an "or" relationship.

[0020] 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.

[0021] 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.

[0022] Selectable embodiments of this application will be described in detail below with reference to the attached drawings.

[0023] 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 with the working airflow. In related technologies, the water vapor is discharged from the air outlet of the main assembly with the working airflow, but complete discharge may not be possible. As a result, some water vapor accumulates inside the main assembly, and if this accumulation occurs over a long period, it may affect the service life of the main assembly.

[0024] Embodiments of this application provide a power assembly comprising a housing having an air outlet and a drain port, a power source located within the housing and configured to provide working fluid power, and a sound-dampening cover provided between the power source and the housing and having a perforated plate and an outer wall, wherein an operating airflow containing water vapor condenses on the perforated plate and / or the outer wall and is then discharged through the drain port.

[0025] 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 drain port, 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.

[0026] 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.

[0027] 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.

[0028] Specifically, as shown in Figures 1 and 2, embodiments of the present application provide a power assembly 100 configured to provide power for cleaning operations, 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 drain outlet 12, the air outlet 11 used to discharge a substantially dry airflow in the working airflow and the drain outlet 12 used to discharge water vapor mixed in the working airflow, the power assembly 100 further includes a power source 20 located within the housing 10, and the power source 20 provides fluid power. The power assembly 100 is configured such that the power source 20 is specifically a suction source, such as a fan, and the power source 20 has an air inlet 21 and an air outlet 22, and the power assembly 100 further includes a sound-dampening cover 30, which is provided between the power source 20 and the housing 10, and the sound-dampening cover 30 is used to reduce noise generated during the flow process of the working airflow, and the sound-dampening cover 30 includes a perforated plate 31 and an outer wall 32, where the working airflow containing water vapor is discharged from the drain port 12 after condensing into liquid on the perforated plate 31 and / or the outer wall 32, and the working airflow that has not condensed into liquid is discharged from the air outlet 11. The condensed water is discharged immediately from the drain port, 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.

[0029] 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 the working airflow containing water vapor condenses on the perforated plate 31 before flowing down along the perforated plate 31 and finally being discharged from the drain port 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 before flowing down along the outer wall 32 and finally being discharged from the drain port 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 drain port 12 on the bottom of the housing 10.

[0030] 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 drain port 12 is located on the bottom of the housing 10, so that the water flow condenses and collects on the perforated plate 31 and / or the outer wall 32 and is then discharged from the drain port 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.

[0031] 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 a hollow structure, the hollow 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 hollow 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 flow 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, folds back through 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 fan's air outlet 22, 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 along the outer wall 32 for a certain distance, 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 that they move downward after exiting the air outlet.

[0032] The arrows in Figures 5 and 6 schematically indicate the flow direction of the working airflow, and the power assembly 100 further has a second airflow passage, the second airflow passage communicating from the bottom of the sound-dampening cover 30 to the air outlet 11 of the housing 10, specifically the second airflow passage including a path extending upward from the bottom of the sound-dampening 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-dampening cover 30 via the first airflow passage, it passes through the hollow structure at the bottom of the sound-dampening cover 30 and reaches the gap between the sound-dampening 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.

[0033] In response to the startup of the power source 20, the power assembly 100 sequentially discharges the working airflow through the power source 20, the first airflow path, the second airflow path, and the air outlet 11, completing the discharge of the working airflow which is almost entirely free of water vapor.

[0034] 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.

[0035] In some embodiments, as shown in Figure 8, the bottom surface of the U-shaped communication structure includes at least one drain 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 drain hole 312, reaches the bottom surface of the housing 10, and is discharged from the drain port 12.

[0036] In some embodiments, as shown in Figure 8, the sound-absorbing cover 30 further includes a hollow 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 a hollow structure 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.

[0037] Embodiments of this application provide a surface cleaning device comprising the power assembly described in any one of the above paragraphs.

[0038] 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 drain port. 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, optimizing the use of the power assembly.

[0039] 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.

[0040] 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, where the axial depth is 20 to 120 mm.

[0041] 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 to 120 mm. The sound-dampening chamber of this application, through a combination of axial and radial sound dampening, particularly through a sound-dampening chamber structure with an axial depth of 20 to 120 mm, can dampen noise in the range of 500 to 3200 Hz, 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.

[0042] 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 the housing is used to house related devices, such as circuit control boards, etc., and the housing is usually formed from 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, the 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 to 90,000 r / min, the power assembly 100 further includes a silencing chamber 34, the silencing chamber 34 is approximately on the central axis, and the power source 20 A sound-dampening chamber 34 is provided around the housing 10 and the power source 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, the flow of the working airflow generates working noise, 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 to 8000 Hz, and the second frequency range is 500 to 3200 Hz, where the axial depth is 20 to 120 mm. The sound-dampening chamber structure with an axial depth of 20 to 120 mm can silence noise in the 500 to 3200 Hz range, and the radial depth can silence noise in the 3000 to 8000 Hz range.

[0043] 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 the circulation of the working airflow and is also advantageous for uniform noise reduction. Furthermore, since the size of the hole diameters is almost uniform, the difficulty of processing can be reduced.

[0044] 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 drainage holes, and sufficient sound wave reflection occurs at the bottom of the U-shaped structure, resulting in axial sound absorption.

[0045] 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 embodiments described above 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.

[0046] As shown in regions A and B of Figure 9, after sound passes through the perforated plate 31 and enters the sound-absorbing chamber 34, sound reflection and refraction propagation occurs between the outer wall 32 of the sound-absorbing chamber 34 and the perforated plate 31. The incident sound wave and the reflected sound wave overlap, producing a sound-absorbing effect. When the phase difference of the overlapping incident sound wave and the reflected sound wave reaches 180 degrees, maximum sound absorption is achieved. Therefore, rationally controlling the radial depth and axial depth of the sound-absorbing chamber affects the sound-absorbing effect.

[0047] 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 to 15 mm, noise in the frequency band of 3000Hz to 8000Hz can be effectively removed, and selectable radial depths are 5 mm, 8 mm, 10 mm, 12 mm, etc.

[0048] However, with the radial depth described above, noise in the mid-to-low frequency band below 3000 Hz cannot be silenced. By rationally controlling the axial depth parameter, axial reflection silencer can silence noise in the mid-to-low frequency band below 3000 Hz. 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 in which the sound 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 3000 Hz. Experimental verification has shown that when the axial depth of the silencer chamber is 20 to 120 mm, noise in the mid-to-low frequency band below 3000 Hz, for example, noise in the 500 to 3200 Hz or 1000 to 3000 Hz frequency band, can be effectively removed. Here, selectable axial depths are 25 mm to 80 mm, for example, 40 mm, 50 mm, 60 mm, 70 mm, etc.

[0049] 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.

[0050] When a fan operates in a rotational speed range of 70,000 r / min to 90,000 r / min, 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 to 3200 Hz, which can be calculated using the following method: 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.

[0051] 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 in the range of 500 to 8000 Hz, so the sound-dampening chamber of this application can cover the entire operating speed range of a normal fan.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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 in the 3000-8000Hz range. Accordingly, in order to satisfy multifaceted needs such as smoothness of the 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 1-5 mm, with selectable options such as 2 mm or 3 mm. The number of holes in the perforated plate is 100-1400, with selectable options such as 1058 or 1200. The distance from the perforated plate to the central axis of the sound-dampening cover is 20-55 mm, with selectable options such as 30 mm, 37 mm, or 45 mm. The thickness of the perforated plate is 1-4 mm, 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 in the 3000-8000Hz range, and does not affect the actual application or manufacturing process of the sound-absorbing cover.

[0056] Considering the limitations of parameter adjustment in the actual application of filtration noise reduction and radial reflection noise reduction of the sound-absorbing cover, combining it with axial depth parameters allows for noise reduction from 500 to 3200 Hz, and overall noise reduction from approximately 500 to 8000 Hz.

[0057] As shown in region C of Figure 9, when the working airflow flows up and down along 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 with the sound 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 to 120 mm, it has a supplementary effect on noise removal in the mid-to-low frequency band below 3000 Hz, and can dampen noise in the frequency band of, for example, 500 to 3200 Hz or 1000 to 3000 Hz. Here, the selectable axial heights are 25 mm to 80 mm, for example, 40 mm, 50 mm, 60 mm, 70 mm, etc.

[0058] The power assembly provided in the embodiment of this application includes a sound-dampening chamber, which has axial depth and radial depth, with the radial depth configured to dampen noise in a first frequency range, for example, noise in the 3000-8000Hz range, and in combination with parameters such as the diameter, number, and thickness of the perforated plate, further dampening noise in the 3000-8000Hz range. At the same time, the axial depth of the sound-dampening chamber is 20-120mm, and the axial depth is configured to dampen noise in a second frequency range, for example, noise in the 500-3000Hz range. Therefore, the sound-dampening chamber of this application, through a combination of axial and radial damping, achieves a sound-dampening effect in the 500-8000Hz range and can cover the noise frequencies of existing household handheld appliances.

[0059] 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.

[0060] 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.

Claims

1. A housing including an air outlet and a drain, A power source located within the housing and configured to provide fluid power, A sound-absorbing cover, which includes a perforated plate and an outer wall, is provided between the power source and the housing, A power assembly in which water vapor in the working airflow condenses into a liquid on the perforated plate and / or the outer wall and is then discharged from the drain port, and the working airflow that has not condensed into a liquid is discharged from the air outlet.

2. The power assembly according to claim 1, wherein the air outlet is located on the side of the housing and the drain outlet is located on the bottom surface of the housing.

3. The aforementioned power assembly is A first air passage is connected from the fan's air outlet to the bottom of the sound-dampening cover, The present invention further includes a second air passage that communicates from the bottom of the sound-dampening cover to the air outlet of the housing, The power assembly according to claim 1, wherein, in response to the activation of the power source, the working airflow flows sequentially through the power source, the first air passage, the second air passage, and the air outlet and is discharged.

4. The first air passage is, The power assembly according to claim 3, comprising a path extending downward from the air outlet of the fan along the inner wall of the perforated plate to the bottom of the sound-dampening cover.

5. The first air passage is The power assembly according to claim 3, comprising a path that extends from the air outlet of the fan, along the perforated plate, between the perforated plate and the outer wall, folds back through the outer wall and exits the perforated plate, and extends downward along the inner wall of the perforated plate to the bottom of the sound-dampening cover.

6. The second air passage is, The power assembly according to claim 3, further comprising a path extending upward from the bottom of the sound-dampening cover along the outer circumference of the outer wall to the air outlet of the housing.

7. The power assembly according to claim 1, wherein the perforated plate and the outer wall form a connecting structure with a U-shaped cross-section.

8. The power assembly according to claim 7, wherein the bottom surface of the U-shaped connecting structure includes at least one drain hole.

9. The sound-dampening cover is The power assembly according to claim 7, further comprising a hollow assembly bracket provided inside the perforated plate and configured to allow an operating airflow or condensed water to pass through.

10. Surface cleaning equipment, A surface cleaning device comprising a power assembly according to any one of claims 1 to 9.

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