Self-cleaning range hood

Abstract

The present application relates to a self-cleaning type fan and range hood. The self-cleaning type fan comprises a fan body and a cleaning device. The fan body comprises a volute and an impeller rotatably arranged in the volute, and the ring wall of the volute is provided with a clearance hole. The cleaning device comprises a driving mechanism and a cleaning piece in driving connection with the driving mechanism. The cleaning piece has a spraying surface for spraying cleaning medium to the impeller and a shielding surface for blocking the clearance hole, and the rotation axis of the cleaning piece is parallel to the central axis of the impeller. The cleaning piece rotates relative to the volute under the driving of the driving mechanism so that the spraying surface and the shielding surface correspond to the clearance hole respectively, and the cleaning piece switches between the cleaning state and the non-cleaning state.

Description

Technical Field

[0001] This invention relates to the field of kitchen equipment technology, and in particular to a self-cleaning fan and a range hood. Background Technology

[0002] With the continuous advancement of self-cleaning technology for range hoods, steam cleaning or water cleaning has been widely used in the field of range hood self-cleaning. Its basic principle is that a steam generator produces steam or a water pump pumps water to deliver steam or water to the nozzle at the end of the spray pipe. The steam or water is then sprayed out of the nozzle quickly to clean the impeller and volute.

[0003] Currently, for cleaning impellers, patent applications such as CN201310377491.7 (publication number CN104421986A) describe a range hood whose cleaning device is mounted on the casing. This device includes a spray pipe with nozzles located within the impeller's inner cavity to clean the lowest-positioned portion of the blades. While this cleaning device achieves impeller cleaning, the fixed spray pipe means the nozzles are also fixed, preventing a thorough cleaning of the impeller and resulting in poor cleaning effectiveness.

[0004] In order to achieve comprehensive cleaning, the applicant's earlier application, application number CN201711480573.9 (publication number CN109990332A), invention patent "A cleaning device for a range hood fan system", proposed a design idea to improve the cleaning effect by moving the cleaning medium supply component along the length direction of the opening on the volute to perform comprehensive cleaning of the impeller.

[0005] However, the above solution necessitates the creation of an elongated clearance hole on the volute extending along the moving direction of the cleaning medium supply component. Although a blocking part driven by a second drive mechanism is added at the elongated clearance hole to open or close it in order to reduce the impact of the elongated clearance hole on the fan performance when not cleaning, the cleaning medium supply component and the blocking part require two independent drive mechanisms. This results in a complex structure for the cleaning device, making it difficult to coordinate and control the two drive mechanisms. Furthermore, the cleaning medium supply component occupies a significant amount of space as it moves along the elongated clearance hole, leading to a larger size of the range hood. Summary of the Invention

[0006] Therefore, it is necessary to address the problems of complex structure and difficulty in control of cleaning devices. This invention provides a self-cleaning fan and range hood.

[0007] In one embodiment of this application, the present invention provides a self-cleaning fan, comprising:

[0008] A fan body, comprising a volute and an impeller rotatably disposed within the volute, wherein a clearance hole is provided on the annular wall of the volute; and

[0009] A cleaning device includes a drive mechanism and a cleaning component pulverizedly connected to the drive mechanism. The cleaning component has a spray surface for spraying cleaning media onto the impeller and a shielding surface for blocking the clearance orifice. The rotation axis of the cleaning component is parallel to the central axis of the impeller. Driven by the drive mechanism, the cleaning component rotates relative to the volute, so that the spray surface and the shielding surface correspond to the clearance orifice, thereby switching the cleaning component between a cleaning state and a non-cleaning state. This configuration allows the cleaning device to achieve state switching of the cleaning component using only a single drive mechanism, occupying a smaller space and contributing to the compactness of the fan structure.

[0010] According to one embodiment of this application, the clearance hole extends axially on the annular wall to form a strip-shaped through hole. This arrangement ensures that the length direction of the clearance hole aligns with the extension direction of the rotation axis of the cleaning component, facilitating the assembly of the cleaning device within a smaller space. Simultaneously, the spray surface of the cleaning component can more easily spray the cleaning medium directly to both axial ends of the impeller without rotating the cleaning component along an axis perpendicular to the central axis of the impeller.

[0011] According to one embodiment of this application, when the cleaning component rotates around the rotation axis to be in the cleaning state, the spray surface corresponds to the clearance hole for spraying cleaning medium toward the impeller. When the cleaning component rotates around the rotation axis to be in the non-cleaning state, the spray surface is outside the volute, and the shielding surface corresponds to the clearance hole to block the clearance hole. With this configuration, this application not only prevents the spray surface from being contaminated by oil inside the volute during the cleaning state, but also prevents oil fumes from flowing out of the clearance hole and contaminating the spray surface and casing during the non-cleaning state. This prevents pressure loss inside the volute, avoids noise caused by airflow disturbance, and helps improve the oil fume extraction effect.

[0012] According to one embodiment of this application, the angle between the spray surface and the shielding surface in the cleaning component is greater than 0° and less than 90°. This arrangement ensures that the nozzle located on the spray surface is outside the volute when the shielding surface blocks the clearance hole, and that the nozzle orifice is away from the clearance hole, thus preventing oil fumes leaking through the clearance hole from contaminating or clogging the nozzle orifice.

[0013] According to one embodiment of this application, the cleaning component includes a hollow cavity providing the spray surface and the shielding surface, a delivery pipe communicating with the internal space of the hollow cavity, and a nozzle disposed on the spray surface, the nozzle orifice communicating with the internal space of the hollow cavity. With this configuration, only a single drive mechanism is needed to rotate the hollow cavity, enabling the cleaning component to switch between a cleaning state and a non-cleaning state.

[0014] According to one embodiment of this application, a plurality of nozzles are arranged at intervals along the axial direction of the impeller on the spray surface. With this arrangement, after the spray surface is screwed into the volute, the multiple nozzles respectively spray cleaning media to different axial positions of the impeller to clean the entire area of ​​the corresponding blades. Furthermore, by rotating the impeller, all blades in the impeller can be cleaned, thereby achieving full-area cleaning of the impeller without the need for axial movement of the nozzles.

[0015] According to one embodiment of this application, the hollow cavity has a wedge-shaped structure, with its two wedge surfaces serving as the injection surface and the shielding surface, respectively. The smaller end face of the hollow cavity is a plane extending obliquely from the injection surface to the shielding surface, and the larger end face of the hollow cavity is an arc surface extending curvedly from the injection surface to the shielding surface. This configuration allows the hollow cavity to flip smoothly at the clearance hole.

[0016] According to one embodiment of this application, the driving mechanism is a drive motor, which is tractably connected to the hollow cavity to drive the hollow cavity to swing around the rotation axis. When the hollow cavity swings forward, the spray surface retracts from the clearance hole so that the nozzle is outside the volute, and the shielding surface approaches the clearance hole to block the clearance hole. When the hollow cavity swings in the reverse direction, the shielding surface moves away from the clearance hole to open the clearance hole, and the spray surface enters the clearance hole so that the nozzle is inside the volute. This helps to simplify the structural design of the hollow cavity and save the installation space of the drive motor. With this configuration, during the cleaning process, the clearance hole is open, allowing the nozzle to spray the cleaning medium onto the impeller blades for cleaning. In the non-cleaning process, the nozzle is located outside the volute, and the clearance hole is blocked. This not only prevents the nozzle from affecting airflow within the volute and from becoming clogged with oil, but also prevents oil fumes from flowing out of the clearance hole and contaminating the nozzle and housing. This also prevents pressure loss within the volute, avoids noise caused by airflow disturbance, and helps improve the fume extraction effect.

[0017] According to one embodiment of this application, the rotation axis of the hollow cavity is adjacent to the larger end face of the hollow cavity; the output shaft centerline of the drive motor coincides with the rotation axis of the hollow cavity. With this configuration, when the hollow cavity is driven to rotate about the rotation axis L, the smaller end face of the hollow cavity can smoothly enter and exit the clearance hole, avoiding structural interference while ensuring the sealing effect of the shielding face on the clearance hole.

[0018] According to one embodiment of this application, the shielding surface of the cleaning component is curved, and the radius of curvature of the shielding surface is equal to the radius of curvature of the annular wall of the volute. This configuration ensures that when the cleaning component is not in a cleaning state, the inner annular surface of the volute remains smooth at the clearance hole, preventing turbulence and noise generation within the volute.

[0019] According to another aspect of this application, this application further provides a range hood, comprising:

[0020] shell; and

[0021] The self-cleaning fan described above is disposed within the housing.

[0022] In summary, the self-cleaning fan and range hood of this application have the following advantages: First, they can achieve the switching of the cleaning component's state using only one drive mechanism while occupying a small space, which helps to improve the compactness of the fan structure. Second, in the cleaning state, the clearance hole is open, which allows the nozzle to spray the cleaning medium onto the impeller blades through the clearance hole for cleaning. In the non-cleaning state, the nozzle is located outside the volute, and the clearance hole is blocked. This not only prevents the nozzle from affecting the airflow inside the volute and prevents the nozzle from being blocked by oil, but also prevents oil fumes from flowing out of the clearance hole and contaminating the nozzle and housing. This also prevents the loss of wind pressure inside the volute, avoids noise caused by airflow disturbance, and helps to improve the fume extraction effect. Attached Figure Description

[0023] Figure 1 This is a perspective view of a range hood in the cleaning state according to an embodiment of this application;

[0024] Figure 2 A perspective view of the self-cleaning fan of the above embodiment of this application in a non-cleaning state is shown;

[0025] Figure 3 An exploded view of the self-cleaning fan according to the above embodiments of this application is shown;

[0026] Figure 4 An explosion diagram of the cleaning device in the self-cleaning fan of the above embodiments of this application is shown;

[0027] Figure 5 A cross-sectional schematic diagram of the self-cleaning fan of the above embodiment of this application in a cleaning state is shown;

[0028] Figure 6 A cross-sectional schematic diagram of the self-cleaning fan of the above embodiment of this application in a non-cleaning state is shown.

[0029] Explanation of main component symbols: 1. Self-cleaning fan; 10. Fan body; 11. Volute; 110. Clearance hole; 111. Annular wall; 112. Volute tongue; 113. End plate; 12. Impeller; 120. Central axis; 121. Blade; 20. Cleaning device; 21. Drive mechanism; 210. Drive motor; 22. Cleaning component; 2201. Spray surface; 2202. Shielding surface; 221. Nozzle; 220. Hollow cavity; 2203. Smaller end face; 2204. Larger end face; 222. Conveying pipe; L. Rotation axis; C. Output shaft centerline.

[0030] The above description of the main component symbols, together with the accompanying drawings and specific embodiments, provides a more detailed explanation of the present invention. Detailed Implementation

[0031] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation shown in the accompanying drawings.

[0033] The positional relationships are provided only for the convenience of describing the invention and for simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0038] While existing cleaning devices for range hood fan systems incorporate a shielding part driven by a second drive mechanism at the elongated clearance hole to reduce its impact on fan performance when not being cleaned, the cleaning medium supply component and the shielding part require two independent drive mechanisms, resulting in a complex and difficult-to-control structure. Therefore, this application provides a self-cleaning fan and range hood that simplifies the structure of the cleaning device and reduces the difficulty of controlling the cleaning process.

[0039] Reference Appendix Figures 1 to 6 As shown, one embodiment of this application provides a range hood, which may include a housing (not shown) and a self-cleaning fan 1 mounted on the housing for absorbing cooking fumes. It is understood that the range hood of this application may also include, but is not limited to, a cleaning medium supply component (such as a water tank and / or a steam generator), a water collection box, and / or a sensor to assist in completing the functions of fume extraction and self-cleaning; further details will not be elaborated upon here.

[0040] Specifically, such as Figures 1 to 4 As shown, the self-cleaning fan 1 may include a fan body 10 and a cleaning device 20. The fan body 10 includes a volute 11 and an impeller 12 rotatably disposed within the volute 11; a clearance hole 110 is provided on the annular wall 111 of the volute 11. The cleaning device 20 may include a drive mechanism 21 and a cleaning component 22 pulverizedly connected to the drive mechanism 21. The cleaning component 22 has a spray surface 2201 for spraying cleaning medium onto the impeller 12 and a shielding surface 2202 for blocking the clearance hole 110. The rotation axis L of the cleaning component 22 is parallel to the central axis 120 of the impeller 12. The cleaning component 22 rotates relative to the volute 11 under the drive of the drive mechanism 21, so that the spray surface 2201 and the shielding surface 2202 correspond to the clearance hole 110 respectively, thereby switching the cleaning component 22 between a cleaning state and a non-cleaning state. In this way, the cleaning device 20 only needs to use one drive mechanism 21 to realize the state switching of the cleaning component 22 while occupying a small space, which helps to improve the compactness of the fan structure.

[0041] Optionally, the clearance hole 110 of the volute 11 extends axially on the annular wall 111 to form a strip-shaped through hole. In this way, the length direction of the clearance hole 110 is aligned with the extension direction of the rotation axis L of the cleaning component 22, facilitating the assembly of the cleaning device 20 within a smaller space. Simultaneously, the spray surface 2201 of the cleaning component 22 can more easily spray the cleaning medium directly to both axial ends of the impeller 12 without rotating the cleaning component 22 along an axis perpendicular to the central axis 120 of the impeller 12.

[0042] More specifically, such as Figure 5 and Figure 6As shown, when the cleaning component 22 rotates around the rotation axis L to be in the cleaning state, the spray surface 2201 of the cleaning component 22 corresponds to the clearance hole 110 and is used to spray cleaning medium toward the impeller 12. When the cleaning component 22 rotates around the rotation axis L to be in the non-cleaning state, the spray surface 2201 of the cleaning component 22 is outside the volute 11, and the shielding surface 2202 of the cleaning component 22 corresponds to the clearance hole 110 to block the clearance hole 110. This not only prevents the spray surface 2201 from being contaminated by oil inside the volute 11 when in the cleaning state, but also prevents oil fumes from flowing out of the clearance hole 110 and contaminating the spray surface 2201 and the casing when in the non-cleaning state. This prevents wind pressure loss inside the volute 11, avoids noise caused by airflow disturbance, and helps to improve the oil fume extraction effect.

[0043] It is worth noting that, compared with the prior art, the self-cleaning fan 1 of this application can switch the cleaning component 22 between the cleaning state and the non-cleaning state using only one drive mechanism 21, which simplifies the structure of the cleaning device 20 and eliminates the need for cooperation between two drive mechanisms, making it easier to control. In other words, the self-cleaning fan 1 of this application only needs to control the drive mechanism 21 to drive the cleaning component 22 to rotate relative to the volute 11 to achieve the state switching of the cleaning component 22.

[0044] For example, such as Figure 3 and Figure 4 As shown, the cleaning component 22 may include a hollow cavity 220 providing a spray surface 2201 and a shielding surface 2202, a delivery pipe 222 communicating with the internal space of the hollow cavity 220, and nozzles 221 disposed on the spray surface 2201, with the nozzle orifice communicating with the internal space of the hollow cavity 220. The delivery pipe 222 is used to communicate with a cleaning medium supply component to transport the cleaning medium from the cleaning medium supply component to the internal space of the hollow cavity 220, and then spray the cleaning medium in the internal space to the impeller 12 through multiple nozzles 221. In this way, this application only needs to use a drive mechanism 21 to drive the hollow cavity 220 to swing, which can realize the switching between the cleaning component 22 and the non-cleaning state.

[0045] Specifically, when the cleaning component 22 is in the cleaning state, the nozzle 221 rotates together with the spray surface 2201 to face the impeller 12 through the clearance hole 110, so that the nozzle 221 can directly spray the cleaning medium onto the impeller 12 for cleaning. When the cleaning component 22 is in the non-cleaning state, the nozzle 221 of the cleaning component 22 rotates together with the spray surface 2201 to be outside the volute 11, so as to prevent the nozzle 221 from remaining in the volute 11 and being contaminated or blocked by oil fumes when the range hood is working; at the same time, the shielding surface 2202 of the cleaning component 22 rotates to block the clearance hole 110, which not only prevents the oil fumes in the volute 11 from flowing out of the clearance hole 110 and contaminating the nozzle 221 or the housing, but also prevents the loss of wind pressure in the volute 11, and avoids disturbing the airflow and affecting the oil fume extraction effect.

[0046] Optionally, such as Figure 4 As shown, the included angle θ between the spray surface 2201 and the shielding surface 2202 in the cleaning component 22 is greater than 0° and less than 90°, that is, 0° < θ < 90°; that is, the spray surface 2201 and the shielding surface 2202 in the cleaning component 22 are opposite to each other, so that while the shielding surface 2202 blocks the clearance hole 110, the spray surface 2201 is opposite to the clearance hole 110, ensuring that the nozzle 221 provided on the spray surface 2201 is outside the volute 11, and the nozzle orifice of the nozzle 221 is opposite to the clearance hole 110, so as to prevent the oil fumes leaking through the clearance hole 110 from polluting or clogging the nozzle orifice of the nozzle 221.

[0047] In other words, the cleaning device 20 of this application uses a drive mechanism 21 to drive the hollow cavity 220 to swing around the rotation axis L, thereby enabling the cleaning component 22 to switch between a cleaning state and a non-cleaning state. For example, as Figure 1 and Figure 5 As shown, when the hollow cavity 220 swings in the opposite direction to put the cleaning component 22 in a cleaning state, the shielding surface 2202 of the cleaning component 22 moves away from the clearance hole 110 to open the clearance hole 110; at the same time, the nozzle 221 enters the interior of the volute 11 through the clearance hole 110 along with the spray surface 2201, so that the nozzle 221 can directly spray the cleaning medium onto the impeller 12 for cleaning inside the volute 11, which helps to shorten the spray distance, increase the spray force, and improve the cleaning efficiency. Figure 2 and Figure 6As shown, when the hollow cavity 220 swings forward to put the cleaning component 22 in a non-cleaning state, the nozzle 221, along with the spray surface 2201, exits the clearance hole 110 and is outside the volute 11. This prevents the nozzle 221 from remaining inside the volute 11 and being contaminated or blocked by grease when the range hood is working. Simultaneously, the shielding surface 2202 of the cleaning component 22 approaches the clearance hole 110 to seal it. This not only prevents grease from flowing out of the clearance hole 110 and contaminating the nozzle 221 or the housing, but also prevents wind pressure loss inside the volute 11, avoiding airflow disturbance and affecting the fume extraction effect. It is understood that the forward and reverse swings mentioned in this application are relative. For example, when forward swing refers to... Figure 5 and Figure 6 As shown, clockwise rotation and counterclockwise oscillation refer to... Figure 5 and Figure 6 The rotation is shown to be counterclockwise.

[0048] Optionally, the hollow cavity 220 has a wedge-shaped structure, wherein the two wedge surfaces of the hollow cavity 220 serve as the injection surface 2201 and the shielding surface 2202, respectively, so as to ensure that the hollow cavity 220 swings smoothly at the relief hole 110.

[0049] Optionally, such as Figure 4 As shown, the smaller end face 2203 of the hollow cavity 220 is implemented as a plane that extends obliquely from the injection surface 2201 to the shielding surface 2202; the larger end face 2204 of the hollow cavity 220 is implemented as an arc surface that extends curvedly from the injection surface 2201 to the shielding surface 2202.

[0050] Optionally, since the larger end face 2204 of the hollow cavity 220 can provide a sufficiently large installation space, the delivery pipe 222 is installed on the larger end face 2204 of the hollow cavity 220.

[0051] According to the above embodiments of this application, as Figure 3 As shown, the volute 11 may include an annular wall 111, a volute tongue 112 protruding outward from the annular wall 111, and end plates 113 connected to both axial ends of the annular wall 111; the impeller 12 has a plurality of axially extending blades 121 arranged circumferentially at intervals. When the impeller 12 rotates inside the volute 11, the gas inside the volute 11 is driven by the impeller 12 to be discharged from the volute tongue 112, thereby creating a negative pressure in the central region of the volute 11, which in turn draws in external oil fumes through the opening of the end plate 113, thus achieving the effect of oil fume extraction.

[0052] It is worth noting that, such as Figure 1 and Figure 3As shown, multiple nozzles 221 in the cleaning component 22 are spaced apart on the spray surface 2201 along the axial direction of the impeller 12. After the spray surface 2201 is screwed into the volute 11, the multiple nozzles 221 spray cleaning medium to different axial positions of the impeller 12 to clean the entire area of ​​the corresponding blades 121. By rotating the impeller 12, all blades 121 in the impeller 12 can be cleaned, thus achieving full-area cleaning of the impeller 12 without axially moving the nozzles 221. It is understood that the length direction of the clearance hole 110 and the axial direction of the impeller 12 mentioned in this application are consistent with the extension direction of the rotation axis L of the cleaning component 22, so that the multiple nozzles 221 arranged along the axial direction of the impeller 12 can directly spray cleaning medium to different axial positions of the impeller 12. Thus, full-area cleaning of the impeller 12 can be achieved without moving the nozzles 221, preventing mechanical failure due to frequent movement of the nozzles 221 during the spraying of cleaning medium, and helping to extend the service life of the cleaning device 20.

[0053] Optionally, such as Figure 6 As shown, the shielding surface 2202 of the cleaning component 22 matches the clearance hole 110 so that the shielding surface 2202 is embedded in the clearance hole 110 when the cleaning component 22 is in a non-cleaning state, which facilitates better sealing of the clearance hole 110 and prevents oil fumes from leaking out from the clearance hole 110.

[0054] Optionally, such as Figure 6 As shown, the shielding surface 2202 of the cleaning component 22 can be implemented as a curved surface, and the radius of curvature of the shielding surface 2202 is equal to the radius of curvature of the annular wall 111 of the volute 11, so that when the cleaning component 22 is in a non-cleaning state, the inner annular surface of the volute 11 remains smooth at the relief hole 110, preventing turbulence in the airflow inside the volute 11 and generating noise.

[0055] Optionally, such as Figure 3 and Figure 4 As shown, the drive mechanism 21 of the cleaning device 20 is implemented as a drive motor 210, which is tractably connected to the hollow cavity 220 to drive the hollow cavity 220 to rotate bidirectionally around the rotation axis L. This helps to simplify the structural design of the hollow cavity 220 and save the installation space of the drive motor 210. For example, when the drive motor 210 drives the hollow cavity 220 to rotate forward around the rotation axis L, the cleaning component 22 switches from the cleaning state to the non-cleaning state; when the drive motor 210 drives the hollow cavity 220 to rotate in the reverse direction around the rotation axis L, the cleaning component 22 switches from the non-cleaning state to the cleaning state.

[0056] Optionally, such as Figure 4 and Figure 5As shown, the rotation axis L of the hollow cavity 220 is adjacent to the larger end face 2204 of the hollow cavity 220. In this way, when the hollow cavity 220 is driven to rotate around the rotation axis L, the smaller end face 2203 of the hollow cavity 220 can smoothly enter and exit the relief hole 110, avoiding structural interference while ensuring the sealing effect of the shielding surface 2202 on the relief hole 110.

[0057] Optionally, such as Figure 3 and Figure 4 As shown, the drive motor 210 is mounted on the outside of the volute 11, and the output shaft centerline C of the drive motor 210 coincides with the rotation axis L of the hollow cavity 220, so that the drive motor 210 can directly drive the hollow cavity 220 to swing around the rotation axis L. It can be understood that the output shaft centerline C mentioned in this application refers to the centerline of the output shaft of the drive motor 210, that is, the output shaft of the drive motor 210 rotates around the output shaft centerline C.

[0058] It is worth noting that in other examples of this application, the drive motor 210 may also be located in other positions to be transmissibly connected to the hollow cavity 220 via a transmission mechanism such as a gear, belt or chain, as long as it can drive the hollow cavity 220 to swing around the axis of rotation L.

[0059] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A self-cleaning fan, characterized in that, include: The fan body includes a volute and an impeller rotatably disposed within the volute, wherein a clearance hole is provided on the annular wall of the volute. and A cleaning device includes a drive mechanism and a cleaning component pulverizedly connected to the drive mechanism. The cleaning component has a spray surface for spraying cleaning medium onto the impeller and a shielding surface for blocking the clearance hole. The rotation axis of the cleaning component is parallel to the central axis of the impeller. The cleaning component rotates relative to the volute under the drive of the drive mechanism, so that the spray surface and the shielding surface correspond to the clearance hole respectively, thereby switching the cleaning component between a cleaning state and a non-cleaning state.

2. The self-cleaning fan according to claim 1, characterized in that, The clearance hole extends axially on the ring wall to form a strip-shaped through hole.

3. The self-cleaning fan according to claim 1, characterized in that, When the cleaning component rotates about the rotation axis to be in the cleaning state, the spray surface corresponds to the clearance hole for spraying cleaning medium toward the impeller. When the cleaning component rotates about the rotation axis to be in the non-cleaning state, the spray surface is outside the volute, and the blocking surface corresponds to the clearance hole to block the clearance hole.

4. The self-cleaning fan according to claim 1, characterized in that, The angle between the spray surface and the shielding surface in the cleaning component is greater than 0° and less than 90°.

5. The self-cleaning fan according to claim 1, characterized in that, The cleaning component includes a hollow cavity providing the spray surface and the shielding surface, a delivery pipe communicating with the internal space of the hollow cavity, and a nozzle disposed on the spray surface, wherein the nozzle orifice is communicating with the internal space of the hollow cavity.

6. The self-cleaning fan according to claim 5, characterized in that, The plurality of nozzles are arranged at intervals on the spray surface along the axial direction of the impeller.

7. The self-cleaning fan according to claim 6, characterized in that, The hollow cavity has a wedge-shaped structure, with its two wedge surfaces serving as the spray surface and the shielding surface, respectively. The smaller end face of the hollow cavity is a plane that extends obliquely from the spray surface to the shielding surface, while the larger end face of the hollow cavity is an arc surface that extends curvedly from the spray surface to the shielding surface.

8. The self-cleaning fan according to claim 7, characterized in that, The driving mechanism is a drive motor, which is tractably connected to the hollow cavity to drive the hollow cavity to swing around the rotation axis. When the hollow cavity swings forward, the spray surface retracts from the clearance hole so that the nozzle is outside the volute, and the shielding surface approaches the clearance hole to block the clearance hole. When the hollow cavity swings in the opposite direction, the shielding surface moves away from the clearance hole to open the clearance hole, and the spray surface enters the clearance hole so that the nozzle is inside the volute.

9. The self-cleaning fan according to claim 8, characterized in that, The output shaft centerline of the drive motor coincides with the rotation axis of the cleaning component; the rotation axis of the cleaning component is adjacent to the larger end face of the hollow cavity.

10. The self-cleaning fan according to any one of claims 1 to 9, characterized in that, The shielding surface of the cleaning component is curved, and the radius of curvature of the shielding surface is equal to the radius of curvature of the annular wall of the volute.

11. A range hood, characterized in that, include: case; and The self-cleaning fan as described in any one of claims 1 to 10, wherein the self-cleaning fan is disposed within the housing.

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