Low-wind-noise wind wheel structure, fan assembly and dehumidifier

Abstract

The invention relates to a low-wind-noise wind wheel structure, a fan assembly and a dehumidifier, a wind wheel comprises a support, the support comprises a hub, a mounting part and a flow guide part connected between the hub and the mounting part, the flow guide part and the mounting part are both located on the air inlet side of the wind wheel, the flow guide part is in a hollow circular truncated cone shape, and a containing cavity for at least containing part of a motor is defined by the flow guide part; the mounting part is used for mounting a driving shaft of the motor; and the inner ends of the blades are connected to the circumferential outer surface of the hub. According to the low-wind-noise wind wheel structure, the fan assembly and the dehumidifier, the flow guide part with the specific through-flow opening is arranged in the wind wheel, airflow organization in the wind wheel is optimized, airflow is more regular and smoother when entering the containing cavity and acting with the blades, and pneumatic noise is effectively reduced while the air volume is increased; meanwhile, the motor can be partially wrapped by the containing cavity formed by the flow guide part, and leakage of noise of the motor is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of dehumidifiers, and in particular to a low-noise wind wheel structure, a fan assembly, and a dehumidifier. Background Art

[0002] In the prior art, impellers, particularly centrifugal or crossflow impellers, are core components of various fluid machinery, such as fans, air conditioners, dehumidifiers, and air purifiers. Their primary function is to transport or pressurize gas through rotating blades. However, impellers and fan assemblies in the prior art still face several challenges in achieving higher airflow, lower noise, and better structural performance: First, to increase air volume, a straightforward approach is to increase rotor speed. However, for some rotors (especially small ones), excessively high speeds can lead to insufficient internal "air storage" or airflow accommodation, resulting in rapid airflow and turbulent airflow. This can easily generate turbulence and vortex shedding on the blade surface and within the air duct, leading to high aerodynamic noise. Conversely, limiting speed or changing blade shape to reduce noise can compromise air volume.

[0003] Secondly, the motor in the fan (especially the outer rotor motor) generates electromagnetic and mechanical noise during operation. In some traditional structures, the motor is directly exposed or lacks an effective acoustic barrier, causing this motor noise to propagate directly outward and superimpose on the aerodynamic noise, further deteriorating the overall noise performance.

[0004] Furthermore, the hub of a conventional wind turbine or the connection to the motor shaft may lack strength due to poor structural design. This can lead to cracking, deformation, or loose connections, especially during injection molding or after long-term operation. This can affect the turbine's dynamic balance and service life. Poor dynamic balance can further exacerbate vibration and noise. Summary of the Invention

[0005] In order to solve the above problems, the present application provides a low-noise wind wheel structure, a fan assembly and a dehumidifier that can increase air volume and reduce noise.

[0006] To achieve the above objectives, in a first aspect, embodiments of the present application provide a low-wind-noise wind wheel structure, comprising: The bracket includes a hub and a mounting portion, and a guide portion connected between the hub and the mounting portion, the guide portion and the mounting portion are both located on the air inlet side of the wind wheel, the guide portion is a hollow frustum, the guide portion forms a receiving cavity for receiving at least part of the motor, and the mounting portion is used to install the drive shaft of the motor; a plurality of blades, the inner ends of which are connected to the circumferential outer surface of the hub; wherein a plurality of flow openings are circumferentially spaced apart on the outer circumferential side wall of the guide portion, and the opening direction of the flow openings is the same as the rotation direction of the wind wheel, so that the airflow located on the air inlet side of the wind wheel can flow into the receiving cavity through the flow openings.

[0007] Preferably, the wind wheel has a first end and a second end relative to each other, the first end is the end close to the wind inlet side, the second end is the end away from the wind inlet side, and the position where the hub connects to each of the blades is located on the side closer to the second end.

[0008] Preferably, the guide portion includes a transition portion arranged between two circumferentially adjacent flow openings, wherein a portion of the outer wall of the transition portion is concave to form a down-pressure portion, and another portion of the outer wall of the transition portion is convex to form a hollow boosting portion connected to the accommodating cavity; wherein, along the rotation direction of the wind wheel, the outer edge of the previous transition portion and the outer edge of the down-pressure portion of the subsequent transition portion jointly define the flow opening; on the same transition portion, the boosting portion is located on the upstream side of the down-pressure portion, and the protruding height of the boosting portion gradually increases along the rotation direction of the wind wheel.

[0009] Preferably, the number of the flow openings is 8-12.

[0010] Preferably, the width of the through-flow opening gradually increases from close to the mounting portion to away from the mounting portion.

[0011] Preferably, the distance between the hub and the end surface of the second end of the wind wheel is 8-15 mm.

[0012] Preferably, the mounting portion is in the shape of a hollow truncated cone, and the end of the mounting portion facing away from the guide portion at least partially extends out of the central air inlet cavity surrounded by the blades; a shaft sleeve suitable for connecting to the drive shaft of the motor is provided in the mounting portion, and a plurality of reinforcing ribs are circumferentially spaced apart between the outer circumferential wall of the shaft sleeve and the inner circumferential wall of the mounting portion.

[0013] In a second aspect, an embodiment of the present application provides a fan assembly, including a volute, a motor, and an impeller, wherein the impeller is a low-wind-noise wind wheel structure as described in any embodiment of the first aspect.

[0014] Preferably, a wiring hole is opened on the side wall of the volute, and the wiring hole is used for the wiring harness of the power supply motor to pass through, and the wiring hole is located on the horizontal radial side of the motor rotation axis and is lower than the height of the motor rotation axis.

[0015] In a third aspect, an embodiment of the present application provides a dehumidifier, comprising the fan assembly described in any embodiment of the second aspect.

[0016] The low-noise wind wheel structure, fan assembly and dehumidifier designed in this application optimize the airflow organization inside the wind wheel by arranging a guide part with a specific flow opening inside the wind wheel, so that the airflow is more regular and smooth when entering the receiving cavity and interacting with the blades, thereby effectively reducing aerodynamic noise while increasing the air volume; at the same time, the receiving cavity formed by the guide part can partially wrap the motor, reducing the leakage of motor noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the low wind noise wind wheel structure provided in an embodiment of the present application.

[0018] Figure 2 yes Figure 1 Enlarged schematic diagram of point A in the middle.

[0019] Figure 3 yes Figure 1 Enlarged schematic diagram of point B in the middle.

[0020] Figure 4 yes Figure 1 Front view of.

[0021] Figure 5 yes Figure 4 Cross-sectional view at CC.

[0022] Figure 6 This is a schematic diagram of the three-dimensional structure of the wind wheel provided in an embodiment of the present application from another perspective.

[0023] Figure 7 This is a three-dimensional exploded view of the fan assembly provided in an embodiment of the present application.

[0024] Figure 8 yes Figure 7 Enlarged schematic diagram at point D in the middle.

[0025] Figure 9 It is a schematic diagram of the three-dimensional structure of the volute provided in an embodiment of the present application.

[0026] Figure 10 This is a schematic diagram of the motor wiring harness provided in an embodiment of the present application.

[0027] Among them: wind wheel 100, first end 101, second end 102, bracket 10, hub 11, mounting part 12, sleeve 121, reinforcing rib 122, guide part 13, transition part 131, downward pressure part 132, boosting part 133, ring platform part 134, accommodating chamber 14, blade 20, top ring 21, annular inclined surface 211, arc surface 212, bottom ring 22, inclined part 23, arc-shaped transition part 24, flow port 30, volute 40, wiring hole 41, annular mounting seat 42, wall body 43, bottom wall 44, motor 50, wiring harness 51, groove 60, first wall 61, second wall 62, third wall 63, drain outlet 70, fan assembly 200. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application.

[0029] First, embodiments of the present application provide a low-noise impeller structure 100 suitable for use in various devices requiring air flow, such as impellers in fan components used in dehumidifiers, air purifiers, air conditioners, and other household and industrial devices. In this embodiment, impeller 100 has an air inlet side, through which air enters, and an air outlet side, opposite the air inlet side.

[0030] like Figures 1 to 6 As shown, the wind wheel 100 mainly includes a bracket 10 and a plurality of blades 20 .

[0031] The bracket 10 is a supporting structure that connects the multiple blades 20. It includes a hub 11, a mounting portion 12, and a guide portion 13 connected between the hub 11 and the mounting portion 12. In this embodiment, the hub 11 is generally disc-shaped or nearly disc-shaped. The inner ends of the multiple blades 20 are connected to the circumferential outer surface of the hub 11, firmly connected to the hub 11. The mounting portion 12 is located on the windward side of the rotor 100 and is used to mount the motor's drive shaft to transmit power.

[0032] The air guide 13 is located on the air inlet side of the wind wheel 100 and is connected between the hub 11 and the mounting portion 12. In this embodiment, the air guide 13 is in the shape of a hollow truncated cone. Specifically, its large end is connected to or integrally formed with the hub 11, and its small end is connected to or integrally formed with the mounting portion 12. At the same time, the air guide 13 forms a receiving cavity 14 that at least accommodates part of the motor. That is, the inner wall of the hollow air guide 13 forms a receiving cavity 14 with an opening facing away from the air inlet side. The receiving cavity 14 is used to at least partially accommodate the motor, thereby blocking some noise. In specific implementation, the rotor portion of the motor or a portion of the entire motor extends into the receiving cavity 14, and the drive shaft of the motor passes through the receiving cavity 14 and is connected to the mounting portion 12 to drive the wind wheel 100 to rotate.

[0033] A plurality of flow openings 30 are circumferentially spaced apart on the outer peripheral side wall of the guide portion 13. The opening direction of the flow openings 30 is the same as the rotation direction of the wind wheel 100, that is, the outlets of the flow openings 30 face the rotation direction of the wind wheel 100, so that the airflow on the air inlet side of the wind wheel 100 can flow into the receiving cavity 14 through the flow openings 30.

[0034] In this way, when the wind wheel 100 rotates, the external airflow on the air inlet side of the wind wheel 100, in addition to being mainly driven through the gaps between the blades 20, can also flow smoothly into the interior of the receiving chamber 14 through these flow openings 30 that are consistent with the direction of rotation. This part of the airflow entering the receiving chamber 14 can, on the one hand, cool the motor in the receiving chamber 14, and on the other hand, it can be mixed with the main airflow inhaled by the blades 20 in the receiving chamber 14, thereby effectively improving the air intake conditions of the wind wheel 100, reducing airflow separation and turbulence, and improving aerodynamic efficiency. This means that when the wind wheel 100 runs at the same speed, the wind wheel 100 can deliver 30%-50% more air volume, or under the premise of delivering the same air volume, the speed can be reduced, thereby further reducing energy consumption and noise. In this embodiment, the number of flow openings 30 is 8-12. The number of flow openings 30 can specifically be 8, 9, 10, 11 or 12.

[0035] In some embodiments, as Figure 4 、 Figure 5 As shown, the rotor 100 has opposing first and second ends 101, 102. The first end 101 is closer to the wind inlet side, while the second end 102 is further away from the wind inlet side. The hub 11, where it connects to the blades 20, is located closer to the second end 102. In other words, in the axial direction of the rotor 100, the hub 11 is located closer to the motor located on the side of the second end 102. This reduces the axial dimension of the rotor 100, effectively improves the mass distribution of the rotor 100, optimizes its dynamic balance, and reduces vibration and noise caused by imbalance. In this embodiment, the distance between the hub 11 and the end surface of the second end 102 of the rotor 100 is 8-15 mm.

[0036] In some embodiments, as Figure 1 、 Figure 3 、 Figure 5As shown, the wind wheel 100 further includes a top ring 21 and a bottom ring 22 connected to the axial ends of the plurality of blades 20. Specifically, the top ring 21 has an annular inclined surface 211 extending obliquely downward from the inner edge to the outer edge, and the inner edge of the top ring 21 is axially higher than its outer edge, so that the annular inclined surface 211 constitutes the lower surface of the top ring 21 facing the bottom ring 22, and the annular inclined surface 211 also serves as a connecting surface connecting the top ring 21 with the top end of each blade 20, so that the overall shape of the top ring 21 is similar to an upwardly narrowed frustum structure, which can have higher inherent structural rigidity and deformation resistance, so that when the wind wheel rotates at high speed, it can effectively resist the risk of structural deformation caused by centrifugal force and load transferred by the blades 20.

[0037] Specifically, the bottom end of each blade 20 is connected to the bottom ring 22, and the top end of each blade 20 is connected to the top ring 21 via the annular bevel 211. In this way, the top end of the blade 20 is no longer connected to a plane, but to an inclined surface, that is, the annular bevel 211. This connection method increases the effective contact area and fitting length between the top end of the blade 20 and the top ring 21 by utilizing the inclination of the annular bevel 211 without affecting the wind inlet area of ​​the wind rotor, so that the force acting at the connection can be better decomposed and transmitted, thereby enhancing the overall structural strength and rigidity of the wind rotor, so as to more effectively resist the centrifugal force generated during rotation and the load transmitted by the blades, and help maintain the dynamic balance and aerodynamic performance of the entire wind rotor.

[0038] In one embodiment, the top ring 21, bottom ring 22, and blades 20 are integrally molded. This integral molding method allows for seamless integration of the components, which not only enhances structural integrity but also simplifies production and assembly processes, reducing manufacturing costs.

[0039] In some embodiments, as Figure 3 As shown, the top end of the blade 20 is provided with an inclined portion 23 corresponding to the position of the annular inclined surface 211, and the blade 20 is connected and fixed to the annular inclined surface 211 via the inclined portion 23. In this embodiment, the inclined angle and / or curved surface shape of the inclined portion 23 are adapted to or substantially consistent with the inclined angle and / or curved surface shape of the annular inclined surface 211 at its connection position, thereby firmly connecting and fixing the blade 20 to the annular inclined surface 211.

[0040] In a specific embodiment, Figure 2 、 Figure 3 As shown, the inclined portion 23 is located at the outer edge of the top end of the blade 20, that is, the radially outermost edge of the blade 20, which is conducive to the effective matching and connection between the inclined portion 23 and the annular inclined surface 211 of the top ring 21, and can also effectively reduce the occupation of the effective air inlet area of ​​the wind wheel or the interference with the incoming airflow.

[0041] In some embodiments, as Figure 5 As shown, the annular inclined surface 211 is an arc-shaped inclined surface with an opening facing outward. In this embodiment, from the axial cross-section of the wind wheel, the annular inclined surface 211 is not a straight line but an arc with a certain curvature. The contour line of the annular inclined surface 211 is not a straight line but an arc with a predetermined curvature. The opening of the arc is set toward the wind inlet side. Figure 3 The inclined portion 23 of the blade 20 shown also has a matching arc surface, which can further increase the effective contact area between the annular inclined surface 211 and the inclined portion 23, thereby further improving the connection strength and durability.

[0042] In some embodiments, as Figure 1 、 Figure 5 As shown, the surface of the top ring 21 away from the annular inclined surface 211 , that is, the upper surface of the top ring 21 is an outwardly opening arc surface 212 , so as to improve the overall torsional rigidity of the top ring 21 .

[0043] In some embodiments, as Figure 1 、 Figure 5 As shown, the bottom end of the blade 20 extends from the base ring 22 to form an extension. An upwardly inclined arcuate transition portion 24 is provided at the outer edge of the extension. This arcuate transition portion 24 effectively prevents sharp corners from forming on the bottom edge of the rotor, thereby improving safety during operation and assembly. Furthermore, the arcuate transition portion 24 smoothly transitions to the base ring 22.

[0044] In some embodiments, as Figure 1 、 Figure 2 and Figure 5 As shown, the guide portion 13 includes a transition portion 131 disposed between two circumferentially adjacent flow openings 30. A portion of the outer wall of the transition portion 131 is concave to form a down-pressing portion 132, and another portion of the outer wall of the transition portion 131 is convex to form a hollow pressurizing portion 133 that communicates with the receiving chamber 14. Along the rotation direction of the wind wheel 100, the outer edge of the preceding transition portion 131 and the outer edge of the down-pressing portion 132 of the following transition portion 131 jointly define the flow opening 30. That is, during the rotation process, the airflow will first pass through the pressurizing portion 133 of one transition portion 131, then through its down-pressing portion 132, and then enter the receiving chamber 14 through the flow opening 30 formed by the leading edge of the down-pressing portion 132 and the trailing edge of the preceding transition portion 131.

[0045] Specifically, a portion of the outer wall of the transition portion 131 is recessed inward relative to the reference circumferential surface of the guide portion 13 to form a downward pressure portion 132. The recessed downward pressure portion 132 helps guide and converge the airflow as it approaches, facilitating smooth entry of the airflow into the subsequent flow opening 30. Meanwhile, another portion of the outer wall of the transition portion 131 is convex outward relative to the reference circumferential surface of the guide portion 13 to form a raised boost portion 133. This boost portion 133 is hollow, and its interior space is connected to the receiving cavity 14 of the wind rotor 100. On the same transition portion 131, the boost portion 133 is located upstream of the downward pressure portion 132, and the raised height of the boost portion 133 gradually increases along the rotation direction of the wind rotor 100. That is, the windward surface of the boost portion 133 is a smooth curved surface, and when air flows over its surface, the airflow velocity is increased.

[0046] Therefore, when the wind wheel 100 rotates, the external airflow first contacts the guide part 13, and flows through the boost part 133 located on the upstream side, where the airflow is accelerated; then, the accelerated airflow flows to and enters the down-pressure part 132 on the downstream side, where the airflow converges and is compressed to achieve boosting, and then enters the central receiving cavity 14, and finally merges with the airflow sucked in by the main channel under the blade 20, so that the airflow finally discharged from the wind wheel 100 is smoother and more powerful, and can achieve a larger air volume output and a higher wind speed at the same time, which also helps to reduce the noise caused by airflow turbulence, and take away part of the heat of the motor, thereby improving the heat dissipation performance.

[0047] In some embodiments, as Figure 2 、 Figure 5 As shown, the outer edge of the bottom surface of the guide portion 13 is bent to form a ring platform portion 134, and the guide portion 13 is connected to the hub 11 through the ring platform portion 134, so that the guide portion 13 as a whole is less likely to deform; and one end of the flow opening 30 extends to the ring platform portion 134 on the top surface of the guide portion 134; the downward pressure portion 132 extends to the ring platform portion 134, so that the effective air intake area of ​​the flow opening 30 is expanded, which can more effectively capture and guide the airflow into the receiving cavity 14.

[0048] In some embodiments, as Figure 1 、 Figure 2 As shown, the width of the flow opening 30 gradually increases from the direction close to the mounting portion 12 to the direction away from the mounting portion 12 to further increase the air intake area. It is understandable that in addition to adopting the structure of the pressing portion 132 and the pressurizing portion 133 described above, each transition portion 131 of the guide portion 13 can also adopt a structure similar to a fan blade.

[0049] In some embodiments, as Figures 4 to 6As shown, the mounting portion 12 is hollow and truncated. Its larger diameter end is connected to the air guide 13, while its smaller diameter end faces the first end 101 on the wind inlet side of the wind rotor 100. This truncated cone-shaped outer profile also helps guide some external airflow to flow smoothly around it, reducing unnecessary flow resistance. At the same time, the end of the mounting portion 12 facing away from the air guide 13 at least partially extends out of the central air inlet cavity surrounded by the blades 20. A sleeve 121 suitable for connecting to the drive shaft of the motor is provided within the mounting portion 12. In a specific embodiment, the sum of the axial heights of the air guide 13 and the mounting portion 12 is greater than the axial height of the blades 20. This allows the overall axial length of the mounting portion 12 to be longer relative to the overall dimensions of the wind rotor 100. Accordingly, the sleeve 121 can also be made longer to form a larger contact and engagement area with the motor drive shaft, achieving higher torque-bearing capacity, better coaxiality maintenance, and stronger resistance to vibration loosening, thereby ensuring stable power transmission and long-term reliability of the connection.

[0050] In addition, if Figure 6 As shown, a plurality of reinforcing ribs 122 are provided at circumferential intervals between the outer circumferential wall of the sleeve 121 and the inner circumferential wall of the mounting portion 12. The number of reinforcing ribs 122 can be determined based on factors such as the diameter of the mounting portion 12 and the load to be borne. For example, 3, 4, 6 or more ribs can be provided. When the torque changes due to motor starting, braking or load fluctuations, the torsional force acting on the sleeve 121 can be effectively dispersed and transmitted to the wider housing structure of the mounting portion 12 through these reinforcing ribs 122, thereby avoiding excessive stress concentration at the interface where the sleeve 121 and the mounting portion 12 are connected or at certain structural weak points, thereby reducing the risk of cracking or damage due to fatigue or overload.

[0051] Second, as Figure 7 As shown, an embodiment of the present application provides a fan assembly 200, including a volute 40, a motor 50 and an impeller, wherein the impeller is a low-noise wind wheel structure 100 of any embodiment of the first aspect. This enables the entire fan assembly 200 to effectively reduce its overall noise level while ensuring or improving the air volume and air pressure output during operation.

[0052] In some embodiments, as Figure 7 、 Figure 9 、 Figure 10As shown, a wiring hole 41 is formed in the side wall of the volute 40. The wiring hole 41 is used to pass the wiring harness 51 of the electric motor 50. The wiring hole 41 is located on the horizontal radial side of the rotation axis of the motor 50 and is lower than the height of the rotation axis of the motor 50. In specific implementation, the wiring harness 51 extends obliquely upward through the wiring hole 41. At the same time, the wiring hole 41 is not directly above or below the rotation axis of the motor 50, but is offset to one side. This makes it more likely that condensation water will form along the wiring harness 51 or near the wiring hole 41, and the water droplets will flow and drip toward the outside of the volute 40.

[0053] In this embodiment, an annular mounting seat 42 is protruded from the volute 40 at the position corresponding to the motor 50. This annular mounting seat 42 is integrally formed with the volute 40. During installation, the fixing legs of the motor 50 are fixed to the annular mounting seat 42 via screws. In this way, compared with the separate stud base in the related art, the integrated annular mounting seat 42 can prevent the motor 50 from resonating with the volute 40 during operation and generating noise.

[0054] In some embodiments, as Figure 7 As shown, the volute 40 has a wall body 43 and a bottom wall 44. The wall body 43 is usually spirally or involutely developed, and the bottom wall 44 closes one end of the volute 40, so that the wall body 43 and the bottom wall 44 together form an inner cavity, which is mainly used to accommodate the wind wheel 100. When the wind wheel 100 rotates, air is sucked in and flows along the inner cavity and is discharged from the outlet of the volute 40.

[0055] In addition, if Figure 7 、 Figure 8 As shown, a groove 60 is formed on the outer surface of the wall body 43, and the groove 60 is located at the edge where the wall body 43 connects to the bottom wall 44; wherein, a drain outlet 70 is provided on the groove wall of the groove 60 on the downstream side of the rotation direction of the wind wheel 100, and the inner cavity is connected to the groove 60 through the drain outlet 70, and the height of the bottom edge of the drain outlet 70 is flush with or lower than the height of the inner surface of the bottom wall 44, so that the water accumulated in the inner cavity can be discharged from the volute 40 through the drain outlet 70.

[0056] This structure is different from the method of directly opening holes in the bottom wall 44 for drainage. Instead, a groove 60 is provided and a drain port 70 is opened on the groove wall of the groove 60 on the downstream side of the rotation direction of the wind wheel 100. The drain port 70 is opened toward the downstream side of the rotation direction of the wind wheel 100. This effectively prevents the high-speed airflow generated by the high-speed rotation of the wind wheel 100 from directly impacting the drain port 70 and generating a whistling sound, thereby reducing operating noise and improving the user experience. In addition, to ensure smooth drainage, the height of the bottom edge of the drain port 70 is designed to be flush with the height of the inner surface of the bottom wall 44, or slightly lower than the height of the inner surface of the bottom wall 44. In this way, under the action of gravity, water that may accumulate in the inner cavity can flow into the groove 60 through the drain port 70 without hindrance, and finally be discharged from the groove 60 to the outside of the volute 40.

[0057] In some embodiments, as Figure 8 、 Figure 9 、 Figure 10 As shown, the groove 60 includes at least a first wall 61, a second wall 62 arranged at an angle to the first wall 61, and a third wall 63 connecting the first wall 61 and the second wall 62. The first wall 61 is located upstream in the direction of rotation of the wind wheel 100, and the third wall 63 is arranged opposite the opening of the groove 60. The second wall 62, the third wall 63, the wall body 43, and the bottom wall 44 jointly define a drain outlet 70. In other words, the boundary of the drain outlet 70 is jointly defined by the edge portion of the second wall 62, the side edge of the third wall 63, the wall body 43 of the volute 40, and the bottom wall 44 of the volute 40, which facilitates integrated manufacturing and has little impact on the overall structure of the volute 40.

[0058] In some embodiments, as Figures 7 to 9 As shown, the bottom of the groove 60 is provided with an opening toward the exterior of the volute 40. This means that the groove wall of the groove 60 is not continuous and complete, but its bottom groove wall is open. This allows water flowing into the groove 60 from the drain port 70 to be directly discharged from the opening to the exterior of the volute 40, for example, to drip smoothly into a water collection tray (not shown) provided inside the dehumidifier. This prevents secondary accumulation of water in the groove 60 and ensures immediate and thorough drainage.

[0059] In a third aspect, an embodiment of the present application further provides a dehumidifier, comprising the fan assembly 200 of any embodiment of the second aspect.

[0060] The low-noise wind wheel structure, fan assembly and dehumidifier provided in the embodiments of the present application optimize the airflow organization inside the wind wheel by arranging a guide portion with a specific flow opening inside the wind wheel, so that the airflow is more regular and smooth when entering the receiving cavity and interacting with the blades, thereby effectively reducing the aerodynamic noise while increasing the air volume; at the same time, the receiving cavity formed by the guide portion can partially wrap the motor, reducing the leakage of motor noise.

[0061] In the description of this application, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0062] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0063] Finally, it should be noted that the above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A low wind noise wind wheel structure, characterized in that: include: A bracket, comprising a hub and a mounting portion, and a guide portion connected between the hub and the mounting portion, wherein the guide portion and the mounting portion are both located on the air inlet side of the wind wheel, the guide portion being hollow and truncated, the guide portion enclosing a receiving cavity for receiving at least part of the motor, and the mounting portion being used to mount a drive shaft of the motor; A plurality of blades, the inner ends of which are connected to the circumferential outer surface of the hub; wherein, a plurality of flow openings are circumferentially spaced apart on the outer circumferential side wall of the guide portion, and the opening direction of the flow openings is the same as the rotation direction of the wind wheel, so that the airflow on the wind inlet side of the wind wheel can flow into the receiving cavity through the flow openings.

2. The low wind noise wind wheel structure according to claim 1, characterized in that: The wind wheel has a first end and a second end relative to each other, the first end is the end close to the wind inlet side, and the second end is the end away from the wind inlet side, and the position where the hub connects to each of the blades is located on the side closer to the second end.

3. The low wind noise wind wheel structure according to claim 1, characterized in that: The guide portion includes a transition portion arranged between two circumferentially adjacent flow openings, wherein a portion of the outer wall of the transition portion is concave to form a down-pressure portion, and another portion of the outer wall of the transition portion is convex to form a hollow boosting portion connected to the accommodating cavity; wherein, along the rotation direction of the wind wheel, the outer edge of the previous transition portion and the outer edge of the down-pressure portion of the subsequent transition portion jointly define the flow opening; on the same transition portion, the boosting portion is located on the upstream side of the down-pressure portion, and the protruding height of the boosting portion gradually increases along the rotation direction of the wind wheel.

4. The low wind noise wind wheel structure according to claim 1, characterized in that: The number of the flow openings is 8-12.

5. The low wind noise wind wheel structure according to claim 1, characterized in that: The width of the through-flow opening gradually increases from a direction close to the mounting portion to a direction away from the mounting portion.

6. The low wind noise wind wheel structure according to claim 2, characterized in that: The distance between the hub and the end surface of the second end of the wind wheel is 8-15 mm.

7. The low wind noise wind wheel structure according to claim 1, characterized in that: The mounting portion is in the shape of a hollow truncated cone, and one end of the mounting portion facing away from the guide portion at least partially extends out of the central air inlet cavity surrounded by the blades; a shaft sleeve suitable for connecting to the drive shaft of the motor is provided in the mounting portion, and a plurality of reinforcing ribs are circumferentially spaced apart between the outer circumferential wall of the shaft sleeve and the inner circumferential wall of the mounting portion.

8. A fan assembly comprising a volute, a motor and an impeller, characterized in that: The impeller is a low-wind-noise wind wheel structure as described in any one of claims 1-7.

9. The fan assembly according to claim 8, characterized in that: A wiring hole is provided on the side wall of the volute, and the wiring hole is used for passing the wiring harness of the power supply machine. The wiring hole is located on the horizontal radial side of the motor rotation axis and is lower than the height of the motor rotation axis.

10. A dehumidifier, characterized in that: Comprising the fan assembly according to claim 8 or 9.

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