Fan device and facade cleaning equipment

Abstract

The utility model relates to a fan device and vertical face cleaning equipment. The fan device comprises a shell, a driving mechanism, an impeller assembly and a turbulent flow part. A containing cavity and a spiral air duct arranged around the periphery of the containing cavity are formed in the shell, and the spiral air duct is constructed to be communicated with the air inlet side and the air outlet side of the fan device; the driving mechanism is arranged in the accommodating cavity; the impeller assembly is in transmission connection with the driving mechanism, and the impeller assembly is driven by the driving mechanism to rotate, so that external airflow flows from the air inlet side to the air outlet side through the spiral air duct; the turbulent flow part is arranged in the spiral air channel and disturbs airflow flowing through the spiral air channel. By arranging the spiral air duct, the airflow exhaust path is greatly prolonged, and the turbulent flow part is arranged in the spiral air duct, so that airflow in the spiral air duct can be disturbed, sound wave energy is partially consumed before reaching the outlet, and the noise reduction effect can be achieved.

Description

Technical Field

[0001] This disclosure relates to the field of wind turbine technology, specifically to a wind turbine device; this disclosure also relates to a facade cleaning device. Background Technology

[0002] A fan is a machine that uses input mechanical energy to increase gas pressure and discharge gas. It is widely used in various mechanical equipment. For example, in air conditioning equipment, fans can be used for ventilation and cooling; in window cleaning robots, fans can be used to create an internal and external air pressure difference, thereby adhering to vertical surfaces; in vacuum cleaners, fans can be used to create negative pressure to collect dust.

[0003] Traditional fans have a large number of impeller blades, and the contact between the airflow and the blades generates significant slapping noise. Furthermore, due to the short airflow path and low airflow resistance within the fan, noise loss during airflow discharge is minimal, resulting in high operating noise and a poor user experience. Additionally, traditional fans typically feature open, large-area outlets. While this expands the airflow range, it lacks effective sound wave blocking mechanisms, allowing noise to propagate directly outwards through the outlet surface. Utility Model Content

[0004] This disclosure provides a fan device and a facade cleaning device to address the problems existing in the prior art.

[0005] According to a first aspect of this disclosure, a fan device is provided, comprising:

[0006] The housing has a receiving cavity inside and a spiral air duct arranged around the outer periphery of the receiving cavity. The spiral air duct is configured to connect the air inlet side and the air outlet side of the fan device.

[0007] A drive mechanism is disposed in the receiving cavity;

[0008] An impeller assembly, driven by the drive mechanism, is configured to rotate under the drive of the drive mechanism, causing external airflow to flow from the inlet side through the spiral duct to the outlet side; and

[0009] A turbulent flow section is provided within the spiral duct and is configured to turbulently flow the airflow through the spiral duct.

[0010] In one embodiment of this disclosure, a guide plate is provided in the spiral duct, the guide plate being configured to divide the spiral duct into a first duct near the air inlet side and a second duct near the air outlet side; the spiral duct is also provided with a connecting port connecting the first duct and the second duct; the guide plate includes a first end and a second end, the first end being adjacent to the air inlet side and the second end being adjacent to the air outlet side.

[0011] In one embodiment of this disclosure, the turbulence section is disposed on the surface of the guide plate and / or the wall of the spiral duct.

[0012] In one embodiment of this disclosure, the turbulence section is a corrugated structure disposed on the surface of the guide plate and / or the wall of the spiral duct.

[0013] In one embodiment of this disclosure, the guide plate is provided with one, and the communication port is provided between the first end and the second end of the guide plate in the spiral air duct.

[0014] In one embodiment of this disclosure, at least two guide vanes are provided, and the at least two guide vanes are configured to be distributed in the circumferential direction of the spiral air duct; in two adjacent guide vanes, a communication port is formed between the first end of one guide vane and the second end of the other guide vane.

[0015] In one embodiment of this disclosure, of two adjacent air deflectors, the first end of one air deflector is configured to be positioned adjacent to the air intake side relative to the second end of the other air deflector.

[0016] In one embodiment of this disclosure, the orthogonal projections of the first end and the second end that participate in forming the communication port in the axial direction of the spiral duct are configured to be staggered.

[0017] In one embodiment of this disclosure, the opening angle of the connecting port in the circumferential direction of the spiral duct ranges from 3 to 30°.

[0018] In one embodiment of this disclosure, the housing includes a first housing and a second housing fitted inside the first housing, the second housing enclosing the receiving cavity, and the inner wall of the first housing and the outer wall of the second housing enclosing the spiral air duct; wherein, the second housing is provided with a guide port communicating with the spiral air duct, so that the airflow in the spiral air duct enters the receiving cavity through the guide port and flows out.

[0019] In one embodiment of this disclosure, the guide port is located at a position corresponding to the connecting port; the airflow is configured such that, during the flow of the first air duct, at least a portion enters the second air duct through the connecting port and flows out, and at least a portion enters the receiving cavity through the connecting port and the guide port and flows out.

[0020] In one embodiment of this disclosure, the duct is configured to be located on the airflow path from the duct to the second air duct.

[0021] In one embodiment of this disclosure, the sidewall of the second housing is configured to extend outward away from its center to form the passage at a centerline location adjacent to the communication port; the radial dimension of the second passage formed by the second housing and the first housing is configured to gradually increase in the direction in which the airflow flows along the second duct.

[0022] In one embodiment of this disclosure, a circuit board is provided at the end of the drive mechanism, the circuit board being located in the receiving cavity and configured to have a gap between it and the inner wall of the second housing.

[0023] According to a second aspect of this disclosure, a facade cleaning device is also provided, including a fan device provided in the first aspect of this disclosure, the fan device being used to adsorb the facade cleaning device onto the surface to be cleaned.

[0024] One beneficial effect of this disclosure is that by setting a spiral air duct around the outer periphery of the receiving cavity, the airflow exhaust path is significantly extended, thereby achieving noise reduction and improving the user experience. Furthermore, by incorporating a turbulence section within the spiral air duct, the airflow passing through it is disrupted, increasing airflow resistance and further enhancing the noise reduction effect.

[0025] Specifically, during the airflow within the spiral duct, noise gradually attenuates due to air friction, turbulence, structural reflection within the duct, and energy diffusion. Lengthening the duct effectively increases the path length of sound wave propagation, allowing some sound energy to be dissipated before reaching the outlet, thus reducing the intensity of outwardly radiated noise. Furthermore, the longer path allows the airflow to gradually decelerate before the outlet, preventing impact noise from the sudden release of high-speed airflow into the external environment. Moreover, this disclosure extends the outlet path by using a spiral duct, thereby achieving noise reduction while also ensuring a compact design for the fan unit.

[0026] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of the present disclosure and, together with their description, serve to explain the principles of the present disclosure.

[0028] Figure 1 This is a schematic diagram of the air inlet side of the fan device in one embodiment of the present disclosure;

[0029] Figure 2 This is a schematic diagram of the air outlet side of the fan device in one embodiment of this disclosure;

[0030] Figure 3 This is a top view of the air outlet side of the fan device in one embodiment of this disclosure;

[0031] Figure 4 This is a cross-sectional view of a fan assembly according to an embodiment of this disclosure;

[0032] Figure 5 This is a cross-sectional view of the fan assembly from another angle in one embodiment of this disclosure;

[0033] Figure 6 This is a schematic diagram of the air outlet side of the fan device in another embodiment of this disclosure;

[0034] Figure 7 yes Figure 6 A magnified view of a portion of point A in the middle.

[0035] Figures 1 to 7 The one-to-one correspondence between the component names and the reference numerals in the figures is as follows:

[0036] 1. Housing; 101. Air inlet side; 102. Air outlet side; 11. First housing; 12. Second housing; 121. Receiving cavity; 122. Through port; 13. End cap; 14. Air inlet; 21. First air duct; 22. Second air duct; 3. Guide plate; 30. Connecting port; 31. First end; 32. Second end; 33. Planar structure; 34. Corrugated structure; 4. Impeller assembly; 5. Drive mechanism; 6. Circuit board; 61. Gap. Detailed Implementation

[0037] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0038] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0039] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0041] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0042] In this article, "first," "second," etc., are used only to distinguish one another, and not to indicate degree of importance, order, or prerequisite for each other.

[0043] In this document, terms such as “equal” and “same” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0044] This disclosure provides a fan device and a facade cleaning device, wherein the facade cleaning device includes the fan device. The cleaning device can be a window cleaning robot, vacuum cleaner, sweeping robot, floor scrubber, sweeping and mopping robot, fabric cleaning machine, etc. The fan device in the cleaning device can be used to achieve dust collection. Specifically, in facade cleaning devices such as window cleaning robots, the fan device is used to achieve negative pressure adsorption, that is, to adsorb the facade cleaning device onto the surface to be cleaned. It is understood that facade cleaning devices are usually used in relatively quiet environments such as homes and shopping malls, and the noise generated by the fan device can lead to a poor user experience. To solve this technical problem, this disclosure provides a fan device capable of noise reduction.

[0045] Taking a window cleaning robot as an example, in one specific embodiment of this disclosure, the window cleaning robot includes a body that carries the various components of the robot. An adsorption surface is provided on the body, which can adhere to and adhere to surfaces such as glass or walls, allowing the robot to operate on these surfaces. A fan is mounted on the body and configured to create a negative pressure between the adsorption surface and the surface to be cleaned. This negative pressure allows the robot to adhere to the surface, and the robot can then move along it via its own walking mechanism to clean the surface during its movement.

[0046] The following is for reference Figures 1 to 7 The wind turbine device provided in this disclosure is described in detail.

[0047] refer to Figure 1 , Figure 2 , Figure 4 and Figure 5 The fan unit includes: a housing 1, a drive mechanism 5, an impeller assembly 4, and a turbulence section. The housing 1 contains a receiving cavity 121, and a spiral duct surrounds the outer periphery of the receiving cavity 121. The opposite sides of the fan unit are designated as the inlet side 101 and the outlet side 102, respectively. The spiral duct is configured to connect the inlet side 101 and the outlet side 102 of the fan unit. (Refer to...) Figure 5 In the view, the lower side of the fan unit is the air inlet side 101, and the upper side is the air outlet side 102. Airflow can flow into the fan unit from the air inlet side 101 and be discharged from the air outlet side 102 through the spiral air duct.

[0048] In one specific embodiment of this disclosure, such as Figure 6 As shown, an end cap 13 can be fastened to the air inlet side 101 of the housing 1. An air inlet 14 is provided at the center of the end cap 13, or the end cap 13 can be enclosed to form the air inlet 14. The impeller assembly 4 is disposed inside the end cap 13, and the air inlet 14 is connected to the impeller assembly 4. During the rotation of the impeller assembly 4, the external airflow is configured to enter the spiral duct through the air inlet 14. That is, the impeller assembly 4 can draw in air from the air inlet 14 during rotation, forming an airflow. The end cap 13 can block the airflow on the air inlet side 101. After the airflow exits the impeller assembly 4, it will not overflow from the air inlet side 101, but will flow along a specific path in the spiral duct and exit from the air outlet side 102.

[0049] refer to Figure 4 and Figure 5 A drive mechanism 5 and an impeller assembly 4, which are driven and connected to the drive mechanism 5, are installed inside the housing 1. The drive mechanism 5 is located in the receiving cavity 121 and can be a motor. The output shaft of the motor is driven and connected to the impeller assembly 4. The impeller assembly 4 is installed on the air inlet side 101 of the housing 1, and its center is connected to the air inlet 14. The impeller assembly 4 includes multiple blade structures spaced apart along its circumferential direction, and the outer side of the blade structures is connected to the spiral air duct. When the impeller assembly 4 rotates under the drive of the drive mechanism 5, the blade structures can agitate the air and form an airflow. The external airflow can flow from the air inlet side 101 to the air outlet side 102 through the spiral air duct.

[0050] In one embodiment of this disclosure, reference is made to Figure 1 and Figure 2A guide vane 3 is provided in the spiral duct, and the guide vane 3 is configured to extend along the direction of the spiral duct. The guide vane 3 is configured to divide the spiral duct into a first duct 21 near the air inlet side 101 and a second duct 22 near the air outlet side 102; the spiral duct is provided with a connecting port 30 connecting the first duct 21 and the second duct 22. At least part of the airflow generated by the rotation of the impeller assembly 4 can enter the first duct 21, and during the flow in the first duct 21, enter the second duct 22 through the connecting port 30 and flow out.

[0051] Further, refer to Figure 1 , Figure 2 and Figure 5 The guide vane 3 includes a first end 31 and a second end 32. The first end 31 is adjacent to the air inlet side 101, and the second end 32 is adjacent to the air outlet side 102. The first end 31 of the guide vane 3 connects to the air inlet side 101, and the second end 32 connects to the air outlet side 102. Airflow from the air inlet side 101 can flow along the guide vane 3 from the first end 31 to the second end 32 and be discharged from the air outlet side 102, thereby achieving airflow guidance from the air inlet side 101 to the air outlet side 102. In the direction of airflow flow, the guide vane 3 is constructed to spirally extend from its first end 31 to its second end 32 toward the location of the air outlet side 102 to the position of the connecting opening 30. Specifically, the guide vane 3 is a spiral slope inclined toward the air outlet side 102, thereby forming a spiral air duct. Figure 5 As shown, in the airflow direction (i.e., from the first end 31 to the second end 32), the size of the first air duct 21 gradually increases, thereby gradually reducing the airflow velocity and preventing impact noise from the sudden entry and exit of high-speed airflow from the connecting port 30 into the second air duct 22. This disclosure sets the guide plate 3 as a spirally extending slope, thereby lengthening the airflow exhaust path and also reducing the flow velocity within the first air duct 21, thus improving the noise reduction effect.

[0052] The impeller assembly 4 has multiple air outlets in the circumferential direction, which are connected to the annular first air duct 21. This allows at least a portion of the airflow generated by the rotation of the impeller assembly 4 to enter the first air duct 21. Guided by the guide plate 3, the airflow flows along the first air duct 21, and at least a portion of the airflow can enter the second air duct 22 through the connecting port 30 and then exit. Specifically, a portion of the airflow exiting from an outlet adjacent to the connecting port 30 may not flow in the first air duct 21 but can directly enter the second air duct 22 through the connecting port 30.

[0053] This disclosure includes a turbulent flow section within a spiral duct, the turbulent flow section being configured to turbulently circulate the airflow through the spiral duct. In one specific embodiment of this disclosure, reference is made to… Figure 2 and Figure 6The turbulence section can be disposed on the surface of the guide plate 3 and / or the wall of the spiral duct. Specifically, the turbulence section in this disclosure can be a corrugated structure 34 disposed on the surface of the guide plate 3 and / or the wall of the spiral duct. Figure 2 As shown, the surface of the guide plate 3 can be provided with a turbulent section, such as a corrugated structure 34. The corrugated structure 34 can turbulentize the airflow, thereby increasing the flow resistance and reducing airflow noise. In addition to the corrugated structure 34, other types of turbulent sections can also be provided, such as concave-convex structures, sawtooth structures, honeycomb structures, spiral guide groove structures, etc.

[0054] The turbulence-generating element can be disposed not only on the surface of the guide plate 3, but also on the wall of the spiral duct, that is, on part of the inner wall of the housing 1. This also disrupts the airflow in the spiral duct, increasing the flow resistance and achieving a noise reduction effect. When the turbulence-generating element is disposed on the wall of the spiral duct, the surface of the guide plate 3 can also be provided with a turbulence-generating element to enhance the turbulence effect, or, as... Figure 6 As shown, the surface of the guide plate 3 can also be set as a planar structure 33, thereby reducing the structural complexity of the guide plate 3 and reducing the difficulty of production and processing.

[0055] This disclosure creates a spiral air duct around the outer periphery of the receiving cavity by setting a guide plate 3. This spiral air duct includes a first air duct 21 and a second air duct 22 that are interconnected. This allows at least a portion of the airflow generated by the rotation of the impeller assembly 4 to flow into the first air duct 21, and then into the second air duct 22 before exiting. This significantly extends the airflow discharge path, thereby achieving noise reduction and improving the user experience. Furthermore, by setting a turbulence section within the spiral air duct, the airflow passing through the spiral air duct is disrupted, increasing airflow resistance and further enhancing the noise reduction effect.

[0056] Specifically, during the airflow within the spiral duct, noise gradually attenuates due to air friction, turbulence, structural reflection within the duct, and energy diffusion. Lengthening the duct effectively increases the path length of sound wave propagation, allowing some sound energy to be dissipated before reaching the outlet, thus reducing the intensity of outwardly radiated noise. Furthermore, the longer path allows the airflow to gradually decelerate before the outlet, preventing impact noise from the sudden release of high-speed airflow into the external environment. Moreover, this disclosure extends the outlet path by using a spiral duct, thereby achieving noise reduction while also ensuring a compact design for the fan unit.

[0057] Furthermore, the fan device of this disclosure discharges air through the second air duct 22, which significantly reduces the discharge area compared to the open, large-area structure used in traditional fans. Most of the airflow, after exiting the impeller assembly 4, first enters the first air duct 21. During its flow within the first air duct 21, some airflow enters the second air duct 22 through the smaller connecting opening 30 and then flows out. Therefore, the guide plate 3 can provide a certain degree of sound wave blocking, and most noise can be isolated within the first air duct 21 and dissipated during airflow, thus achieving a good noise reduction effect.

[0058] In one embodiment of this disclosure, such as Figure 2 As shown, the opening of the second air duct 22 on the air outlet side 102 is the air outlet of the fan device. When the fan device is installed in a cleaning device, such as a window cleaning robot, the opening of the second air duct 22 can be further enclosed with other structures or components on the cleaning device body to form an air outlet with a smaller air outlet area. Alternatively, a top cover (not shown in the figure) can be additionally provided on the air outlet side 102 of the housing 1, and an air outlet can be opened on the top cover. This ensures that the airflow does not flow out directly after entering the second air duct 22, but is guided by the guide plate 3 to flow along the second air duct 22, and at least part of the airflow can flow out through the air outlet. This further reduces the air outlet area and further extends the airflow exhaust path. Before flowing out of the air outlet, the airflow will flow along the guide plate 3 in the first air duct 21 and the second air duct 22, thereby reducing the airflow velocity, attenuating the sound wave energy, and reducing the noise intensity.

[0059] In one specific embodiment of this disclosure, a single guide vane 3 may be provided, with a connecting port 30 between the first end 31 and the second end 32 within the spiral duct. The guide vane 3 can encircle nearly one full circle within the spiral duct, and its second end 32 is configured to spirally extend towards the outlet side 102 within the spiral duct to a position close to the first end 31, thereby forming the connecting port 30 between the first end 31 and the second end 32. It is understood that with only this one connecting port 30 in the spiral duct with a single guide vane 3, the airflow from the impeller assembly 4 may swirl in the first duct 21 for a relatively long time before entering the second duct 22 through the connecting port 30 and flowing out, thereby improving the noise reduction effect.

[0060] However, simply setting up one guide vane 3 and one connecting port 30 may result in relatively low airflow efficiency. In high-speed applications, this could lead to excessive air pressure within the first air duct 21, causing an increase in airflow velocity at the connecting port 30 and resulting in some jet noise. Therefore, the implementation with only one guide vane 3 is more suitable for fan devices with relatively low speeds, as it can extend the airflow exhaust path as much as possible, achieving a good noise reduction effect.

[0061] In another specific embodiment of this disclosure, at least two guide vanes 3 are provided, and the at least two guide vanes 3 are configured to be distributed circumferentially in the spiral duct. In two adjacent guide vanes 3, a connecting port 30 is provided between the first end 31 of one guide vane 3 and the second end 32 of the other guide vane 3. It is understood that the number of guide vanes 3 is equal to the number of connecting ports 30. For example, if two guide vanes 3 are provided, refer to... Figure 1 A first connecting port 30 is provided between the first end 31 of the first guide plate 3 and the second end 32 of the second guide plate 3, and a second connecting port 30 is provided between the second end 32 of the first guide plate 3 and the first end 31 of the second guide plate 3. Similarly, in a scenario where three guide plates 3 are provided, the three guide plates 3 extend spirally and are arranged end to end, thereby forming three connecting ports 30.

[0062] It should be noted that the number of guide vanes 3 should not be too many, otherwise the number of connecting ports 30 will be too many, which will cause most of the airflow from the impeller assembly 4 to enter the second airflow 22 directly through the connecting ports 30 and flow out before flowing in the first airflow 21 for a sufficient period of time, resulting in insufficient airflow noise reduction.

[0063] The following explanation uses the example of setting up two guide vanes 3. (Reference) Figures 1 to 3 The length, structure, and tilt angle of the two guide vanes 3 can be completely identical. The two guide vanes 3 can be arranged symmetrically, thus forming two connecting openings 30 with the same opening between the two guide vanes 3. Each of the two guide vanes 3 can separate two symmetrical first air ducts 21 and two symmetrical second air ducts 22 within the spiral air duct. The symmetrical arrangement of the guide vanes 3 can balance the air pressure distribution within the air duct, and the symmetrical structure makes the circumferential motion resistance of the airflow basically consistent, avoiding the additional aerodynamic noise caused by airflow back impacting the impeller assembly 4 due to path asymmetry.

[0064] In one embodiment of this disclosure, such as Figure 2As shown, in two adjacent guide vanes 3, the first end 31 of one guide vane 3 is configured to be positioned near the air inlet side 101 relative to the second end 32 of the other guide vane 3. Airflow flows from the first end 31 to the second end 32 in one of the first air ducts 21. When it reaches the connecting port 30, because the first end 31 of the other guide vane 3 is closer to the air inlet side 101 (i.e., in the airflow direction), most of the airflow at the connecting port 30 will flow into the second air duct 22 located on the air outlet side 102 of the guide vane 3, while only a small portion will flow into the first air duct 21 located on the air inlet side 101 of the guide vane 3. This avoids the airflow swirling back and forth in the first air duct 21, preventing difficulty in airflow exit. Most of the airflow enters the second air duct 22 and flows out the first time it reaches the connecting port 30, with only a small portion flowing back into the first air duct 21, thus ensuring efficient airflow from the fan device.

[0065] In one embodiment of this disclosure, reference is made to Figure 3 The orthographic projections of the first end 31 and the second end 32, which participate in forming the connecting opening 30, along the axial direction of the spiral duct are constructed to be staggered. This creates an open structure at the connecting opening 30, allowing the airflow to further reduce its velocity upon reaching the opening, thereby improving noise reduction. If the first end 31 and the second end 32, which participate in forming the connecting opening 30, overlap, a duct-like structure will be formed at the connecting opening 30. The airflow will be difficult to decelerate at this location, and the continuously arranged duct structure will prevent the airflow from dissipating quickly, easily causing it to accumulate in the spiral duct. This is detrimental to the fan's ability to deliver air, and the accumulation will increase the airflow velocity, potentially generating additional aerodynamic noise.

[0066] In one embodiment of this disclosure, the opening angle of the connecting port 30 in the circumferential direction of the spiral duct ranges from 3 to 30°. (See reference...) Figure 3 , Figure 3 The α marked in the figure represents the opening angle of the connecting port 30 in the circumferential direction of the spiral duct, where 3°≤α≤30°. In this embodiment, α=9°. The opening angle of the connecting port 30 affects its opening area. If the angle is too small, the connecting port 30 will not be wide enough, and the airflow will not be able to effectively reduce its velocity when it reaches the connecting port 30. If the angle is too large, the opening of the connecting port 30 will be too large, and the airflow may lose inertia at the connecting port 30 and cannot continue to flow along the subsequent guide plate 3. This disclosure maximizes the noise reduction effect of the spiral duct by setting the opening angle of the connecting port 30.

[0067] In one embodiment of this disclosure, reference is made to Figure 2 , Figure 5 and Figure 7The housing 1 includes a first housing 11 and a second housing 12 fitted inside the first housing 11. The second housing 12 encloses a receiving cavity 121, and the inner wall of the first housing 11 and the outer wall of the second housing 12 enclose a spiral air duct. Wherein, as... Figure 7 As shown, the second housing 12 is provided with a guide port 122 communicating with the spiral duct, so that the airflow in the spiral duct enters the receiving cavity 121 through the guide port 122 and flows out. It is understood that the drive mechanism 5 in the receiving cavity 121 easily generates a large amount of heat during operation, and existing fan devices typically do not have an additional airflow cooling structure. This disclosure achieves a good heat dissipation effect by opening a guide port 122 on the second housing 12, allowing some of the airflow in the spiral duct to enter the receiving cavity 121, thereby absorbing the heat generated by the drive mechanism 5 and dissipating it.

[0068] In one specific embodiment of this disclosure, reference is made to Figure 2 and Figure 5 A circuit board 6 is provided at the end of the drive mechanism 5. The circuit board 6 is located in the receiving cavity 121 and is configured to have a gap 61 between it and the inner wall of the second housing 12. Specifically, the circuit board 6 can be installed at the end of the drive mechanism 5 facing the air outlet side 102. Part of the airflow in the spiral duct can enter the receiving cavity 121 located below the circuit board 6 through the guide port 122, and simultaneously absorb the heat of the drive mechanism 5 and the circuit board 6. The airflow in the receiving cavity 121 can be discharged through the gap 61 between the circuit board 6 and the inner wall of the second housing 12. This achieves simultaneous heat dissipation for the drive mechanism 5 and the circuit board 6, thereby improving the utilization rate of the airflow entering the receiving cavity 121.

[0069] In one embodiment of this disclosure, such as Figure 5 and Figure 7As shown, the guide port 122 is located at a position corresponding to the connecting port 30. The airflow is configured such that, during the flow in the first air duct 21, at least a portion enters the second air duct 22 through the connecting port 30 and flows out, and at least a portion enters the receiving cavity 121 through both the connecting port 30 and the guide port 122 and flows out. This disclosure, by positioning the guide port 122 at the position corresponding to the connecting port 30, allows the airflow at the connecting port 30 to be split during diffusion. Part of the airflow can enter the receiving cavity 121 for heat dissipation, part can be discharged from the second air duct 22, and a small portion may re-enter the first air duct 21. If the guide port 122 is located at other positions on the second housing 12, such as on the duct wall of the first air duct 21 and / or the second air duct 22, causing the receiving cavity 121 to directly communicate with the first air duct 21 and / or the second air duct 22, the resulting airflow will be split within the first air duct 21 and / or the second air duct 22, leading to turbulent airflow in the ducts and potentially generating additional aerodynamic noise. Therefore, this disclosure preferably places the guide port 122 at the position of the corresponding connecting port 30, so that the airflow can be concentrated at the same position for diversion, and the smoothness of the air path in the air duct is guaranteed.

[0070] In one embodiment of this disclosure, such as Figure 7 As shown, the guide port 122 is configured to be located on the airflow path from the connecting port 30 into the second air duct 22. Specifically, referring to... Figure 3 The sidewall of the second housing 12 is configured to extend outward away from its center to form a guide opening 122 at the centerline position adjacent to the connection opening 30. In the direction of airflow along the second air duct 22, the radial dimension of the second air duct 22 formed by the second housing 12 and the first housing 11 is configured to gradually increase.

[0071] like Figure 3 As shown, on the side wall of the second housing 12 between the two passages 122, one end is at a distance R1 from the center, and the other end gradually extends away from the center, increasing the distance between it and the center to R2 (R2>R1). Since the first housing 11 is constructed as a circle, the radial dimension of the second air duct 22 formed by the second housing 12 and the first housing 11 increases from W1 to W2 (W2>W1), in the airflow direction (i.e. Figure 3 (In the view, clockwise direction), the radial dimension of the second air duct 22 gradually increases, and its inlet can have the minimum radial dimension.

[0072] When the airflow passes through the connecting port 30, it tends to continue moving in the current direction. However, since the inlet size of the second air duct 22 is small and the guide port 122 is located on the airflow path from the connecting port 30 into the second air duct 22, more airflow can be diverted, that is, enter the receiving cavity 121 through the guide port 122 to achieve the heat dissipation function.

[0073] In one embodiment of this disclosure, the guide opening 122 is configured to extend obliquely toward the air inlet side 101 in the direction opposite to the airflow direction. That is, in the airflow direction, the guide opening 122 extends obliquely toward the air outlet side 102, thereby playing a guiding role. The guide opening 122 can guide more airflow into the receiving cavity 121 or into the second air duct 22, ensuring the normal operation of the air outlet function and heat dissipation function, and avoiding excessive airflow continuously circulating in the first air duct 21.

[0074] It should be noted that the fan device disclosed herein can be applied not only to the cleaning equipment provided herein, but also to electrical equipment in other fields, such as air conditioners, air purifiers, fresh air systems, hair dryers, radiators, humidifiers, ventilators, and vehicle temperature control systems. The fan device disclosed herein can significantly reduce exhaust noise, making it particularly suitable for equipment with high noise reduction requirements, thereby achieving a silent design, improving user experience, and meeting environmental noise standards.

[0075] Application scenarios

[0076] The window cleaning robot is equipped with a fan device, which creates negative pressure between the adsorption surface and the surface to be cleaned. The negative pressure generated by the fan device allows the window cleaning robot to be adsorbed onto the surface to be cleaned. The window cleaning robot can move on the surface to be cleaned through its own walking mechanism, so as to clean the surface during the self-movement process.

[0077] During the operation of the window cleaning robot, the drive mechanism 5 in the receiving cavity 121 operates and drives the impeller assembly 4 to rotate, thereby forming an airflow from the air inlet side 101. The impeller assembly 4 has multiple air outlets in the circumferential direction, which are connected to the first air duct 21 in the spiral air duct. This allows the airflow generated by the rotation of the impeller assembly 4 to enter the first air duct 21. Under the guidance of the guide plate 3, the airflow can flow along the first air duct 21, and at least part of the airflow can enter the second air duct 22 through the connecting port 30 and flow out. The guide plate 3 is a spiral slope inclined towards the air outlet side 102, thereby forming a spiral air duct surrounding the receiving cavity 121 in the housing 1, extending the airflow discharge path. A turbulence section is provided in the spiral air duct. Specifically, the turbulence section is a corrugated structure 34 provided on the surface of the guide plate 3. The corrugated structure 34 can be used to turbulently flow the airflow through the spiral air duct, thereby increasing the flow resistance of the airflow.

[0078] During the flow of air in the first duct 21 and the second duct 22, its noise gradually attenuates due to air friction, turbulence in the turbulent section, structural reflection within the spiral duct, and energy diffusion. Lengthening the duct is equivalent to increasing the path length of sound wave propagation, causing some sound wave energy to be consumed before reaching the outlet, thereby reducing the intensity of noise radiated outwards. Furthermore, the longer path allows the airflow to gradually decelerate before the outlet, avoiding the impact noise generated when high-speed airflow is suddenly released into the external environment. Moreover, this disclosure extends the outlet path by setting a spiral duct, thereby achieving noise reduction while ensuring the miniaturization of the fan unit.

[0079] Furthermore, the fan device of this disclosure discharges air through the second air duct 22, which significantly reduces the discharge area compared to the open, large-area structure used in traditional fans. Most of the airflow, after exiting the impeller assembly 4, first enters the first air duct 21. During its flow within the first air duct 21, some airflow enters the second air duct 22 through the smaller connecting opening 30 and then flows out. Therefore, the guide plate 3 can provide a certain degree of sound wave blocking, and most noise can be isolated within the first air duct 21 and dissipated during airflow, thus achieving a good noise reduction effect.

[0080] A guide port 122 is provided at the corresponding connection port 30 to connect the spiral air duct to the receiving cavity 121, so that the airflow at the connection port 30 can be split during the diffusion process. Part of the airflow can enter the receiving cavity 121 to dissipate heat from the drive mechanism 5, part of the airflow can be discharged from the second air duct 22, and a small part of the airflow may re-enter the first air duct 21. Among them, the airflow entering the receiving cavity 121 can be discharged after absorbing the heat generated by the drive mechanism 5, thereby achieving a good heat dissipation effect.

[0081] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this disclosure is defined by the appended claims.

Claims

1. A fan arrangement, characterized in that The application relates to a shell (1) provided with a containing cavity (121) and a spiral air duct arranged around the containing cavity (121); the spiral air duct is configured to communicate the air inlet side (101) and the air outlet side (102) of the fan device; a driving mechanism (5) is arranged in the containing cavity (121); a impeller assembly (4) is in driving connection with the driving mechanism (5) and is configured to rotate under the driving action of the driving mechanism (5) to make external airflow flow from the air inlet side (101) to the air outlet side (102) through the spiral air duct; and a turbulence part is arranged in the spiral air duct and is configured to disturb the airflow flowing through the spiral air duct. The spiral air duct is provided with a guide plate (3) configured to separate the spiral air duct into a first air duct (21) close to the air inlet side (101) and a second air duct (22) close to the air outlet side (102); the spiral air duct is also provided with a communication port (30) communicating the first air duct (21) and the second air duct (22); the guide plate (3) comprises a first end (31) adjacent to the air inlet side (101) and a second end (32) adjacent to the air outlet side (102). The turbulence part is arranged on the surface of the guide plate (3) and / or the wall surface of the spiral air duct. The turbulence part is a corrugated structure (34) arranged on the surface of the guide plate (3) and / or the wall surface of the spiral air duct. The guide plate (3) is provided with one communication port (30) arranged between the first end (31) and the second end (32) of the guide plate (3) in the spiral air duct.

2. The fan arrangement of claim 1, wherein The guide plate (3) is provided with at least two guide plates (3) configured to be distributed in the circumferential direction of the spiral air duct; the first end (31) of one of the two adjacent guide plates (3) and the second end (32) of the other guide plate (3) are provided with the communication port (30).

3. The fan arrangement of claim 2, wherein The first end (31) of one of the two adjacent guide plates (3) is configured to be arranged adjacent to the air inlet side (101) relative to the second end (32) of the other guide plate (3).

4. The fan arrangement of claim 3, wherein The first end (31) and the second end (32) participating in the communication port (30) are configured to be staggered in the axial projection of the spiral air duct.

5. The fan arrangement of claim 2, wherein The opening angle range of the communication port (30) in the circumferential direction of the spiral air duct is 3-30 degrees.

6. The fan arrangement of claim 2, wherein ​ 7. The fan arrangement of claim 6, wherein ​ 8. The fan arrangement of any one of claims 5 to 7, wherein, ​ 9. The fan arrangement of claim 8, wherein, ​ 10. The fan arrangement of claim 2, wherein The shell (1) comprises a first shell (11) and a second shell (12) sleeved in the first shell (11), the second shell (12) encloses the containing cavity (121), and the inner wall of the first shell (11) and the outer wall of the second shell (12) enclose the spiral air duct; wherein the second shell (12) is provided with a through port (122) in communication with the spiral air duct, so that the airflow in the spiral air duct enters the containing cavity (121) through the through port (122) and flows out.

11. The fan arrangement of claim 10, wherein The through port (122) is arranged at a position corresponding to the communication port (30); the airflow is configured to flow at least partially into the second air duct (22) through the communication port (30) and flow out, and at least partially into the containing cavity (121) through the communication port (30) and the through port (122) and flow out.

12. The fan arrangement of claim 11, wherein, The through port (122) is configured to be located on the airflow path of the airflow entering the second air duct (22) from the communication port (30).

13. The fan arrangement of claim 12, wherein, The side wall of the second shell (12) is configured to extend outward away from the center thereof to form the through port (122) at a position adjacent to the center line of the communication port (30); in the direction of the airflow flowing along the second air duct (22), the radial dimension of the second air duct (22) enclosed by the second shell (12) and the first shell (11) is configured to gradually increase.

14. The fan arrangement of claim 10, wherein, An electric circuit board (6) is arranged at the end of the driving mechanism (5), the electric circuit board (6) is located in the containing cavity (121), and is configured to have a gap (61) with the inner wall of the second shell (12).

15. A facade cleaning apparatus, characterized in that The fan device according to any one of claims 1-14 is used to adsorb the facade cleaning equipment on a surface to be cleaned.

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