Cleaning device for fan, self-cleaning fan and range hood

Abstract

The invention relates to a cleaning device for a fan, a self-cleaning fan and a range hood. The self-cleaning fan comprises a first pipe body and a second pipe body, wherein the pipe wall of the first pipe body is provided with a strip-shaped hole which extends in the axial direction and is used for being aligned with a receding notch in a volute; the second pipe body is rotatably arranged on the first pipe body in a sleeving manner and is used for being connected with a cleaning medium supply piece; the pipe wall of the second pipe body is provided with a plurality of spraying holes which are spirally distributed in the circumferential direction and are used for spraying a cleaning medium; the driving assembly comprises a first driving mechanism which is in driving connection with the second pipe body; and the second pipe body rotates relative to the first pipe body under the action of the first driving mechanism so as to drive the plurality of spraying holes to be sequentially aligned with the strip-shaped hole.

Description

Technical Field

[0001] This application relates to the field of kitchen equipment technology, and in particular to a fan cleaning device, 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, some range hoods have cleaning devices mounted on the casing to clean the impeller. These devices include a spray pipe with nozzles located inside the impeller's cavity to clean the lowest-positioned 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 CN202211517097.4 (publication number CN115898908A), entitled "Self-cleaning fan, range hood and self-cleaning method for range hood", proposed that steam be generated by a steam generator or water be pumped by a water pump, and the cleaning medium such as steam or water be delivered to a nozzle that rotates relative to the volute, so that it can be quickly sprayed out from the nozzle to wash the impeller for comprehensive cleaning.

[0005] However, this design requires a hole to be made in the volute wall because the rotating nozzle needs to extend into the volute. This not only easily leads to air leakage, affecting the performance of the range hood's fan, but also occupies the space originally intended for sound-absorbing cotton, resulting in higher fan noise. Furthermore, the distance between the jet outlet position and different positions on the blades varies at different rotation angles of the rotating nozzle, and the greater the distance, the weaker the jet impact force, which can easily lead to inconsistent cleaning quality on different parts of the blades. Summary of the Invention

[0006] Therefore, in view of the problems of air leakage, high noise and / or inconsistent cleaning quality of existing self-cleaning fans, this application provides a fan cleaning device, a self-cleaning fan and a range hood.

[0007] According to one aspect of this application, one embodiment provides a cleaning device for a fan, comprising: a first tube body having an axially extending strip-shaped hole on its wall for aligning with a clearance notch on a volute; a second tube body rotatably fitted onto the first tube body and for connecting to a cleaning medium supply component; and a plurality of circumferentially spirally arranged spray holes on the wall of the second tube body for spraying the cleaning medium; and a drive assembly including a first drive mechanism drivenly connected to the second tube body; the second tube body rotates relative to the first tube body under the action of the first drive mechanism to drive the plurality of spray holes to sequentially align with the strip-shaped hole.

[0008] According to one embodiment of this application, the number of nozzles aligned with the strip-shaped hole each time is one.

[0009] According to one embodiment of this application, the second tube body is arranged coaxially with the first tube body, and the rotation axis of the second tube body relative to the first tube body is parallel to the rotation axis of the impeller.

[0010] According to one embodiment of this application, the strip-shaped hole and the spray hole satisfy the following relationship: and ;in, θ is the circumferential arc length of the centers of two adjacent nozzles on the outer peripheral wall of the second tube, r1 is the outer diameter of the second tube, α is the central angle of the centers of the two adjacent nozzles relative to the central axis of the second tube, θ2 represents the slotting angle of the strip hole, and r2 is the outer diameter of the first tube.

[0011] According to one embodiment of this application, the nozzle satisfies the following relationship: Wherein, H is the axial length of the volute, L is the axial distance between two adjacent nozzles, α is the central angle between the centers of two adjacent nozzles relative to the central axis of the second tube, and r3 is the radiation radius of the jet ejected through the nozzle on the impeller.

[0012] According to one embodiment of this application, the fan cleaning device further includes a conduit for connecting to a cleaning medium supply member and a connecting mechanism for rotatably connecting the conduit to the second pipe body.

[0013] According to one embodiment of this application, the connecting mechanism includes a mounting base fixed to the first tube body, an inner connector fixedly connected to one end of the second tube body and rotatably inserted into the mounting base, an outer connector fixedly connected to the conduit and axially slidably inserted into the mounting base, a reset member disposed between the outer connector and the mounting base to drive the outer connector to axially abut against the inner connector, guide teeth fixed to the inner connector and arranged annularly toward the outer connector, and mating teeth fixed to the outer connector and engaging with the guide teeth.

[0014] According to one embodiment of this application, the mounting base includes an end cap fixedly connected to one end of the first tube body and a sealing cap detachably connected to the end cap; the reset member is a spring abutting between the outer connector and the sealing cap.

[0015] According to one embodiment of this application, the guide teeth satisfy the following relationship: Wherein, L2 is the arc length of the outer wall of the guide tooth, r4 is the distance of the outer wall of the guide tooth relative to the central axis of the second tube, and α is the central angle between the centers of two adjacent nozzles relative to the central axis of the second tube.

[0016] According to one embodiment of this application, the drive assembly further includes a second drive mechanism drivenly connected to the first tube body. The first tube body is fitted outside the second tube body. Under the action of the second drive mechanism, the first tube body is used to rotate relative to the volute to drive the strip hole to align with or rotate away from the clearance notch.

[0017] According to one embodiment of this application, both the first tube and the second tube have an annular cross-section, and the outer peripheral wall of the first tube is tangent to the edge of the clearance notch.

[0018] According to one embodiment of this application, the first drive mechanism includes a first bracket for fixing to the volute and a first stepper motor mounted on the first bracket and fixedly connected coaxially to the second tube.

[0019] According to one embodiment of this application, the second drive mechanism includes a second bracket for fixing to the volute, a second stepper motor mounted on the second bracket, a drive gear fixedly connected to the output shaft of the second stepper motor, and a driven gear fixedly connected to the first tube and meshing with the drive gear.

[0020] According to another aspect of this application, this application further provides a self-cleaning fan, comprising: a fan body including a volute and an impeller rotatably disposed within the volute, wherein a clearance notch is provided at the volute tongue or the annular wall of the volute; and a fan cleaning device as described in any of the above claims, disposed at the volute tongue or the annular wall of the volute to block the clearance notch.

[0021] According to another aspect of this application, this application further provides a range hood, including: a smoke collection box assembly; and the aforementioned self-cleaning fan, wherein the self-cleaning fan is disposed within the smoke collection box assembly.

[0022] In summary, although the volute has a groove at the volute tongue to form a clearance gap, the first or second pipe in the fan cleaning device located outside the volute will block the clearance gap at the volute tongue, preventing air leakage at this point and making full use of the space outside the volute tongue without occupying the space for sound-absorbing cotton arrangement outside the ring wall.

[0023] Furthermore, when the second tube rotates relative to the first tube under the action of the first drive mechanism, only a portion of the nozzles on the second tube align with the strip-shaped holes to be opened, while the other nozzles are blocked by the first tube, ensuring that the nozzles possess strong jet impact force. Therefore, when the cleaning medium supply component supplies cleaning medium to the second tube, the cleaning medium entering the second tube will be forcefully ejected from the nozzles aligned with the strip-shaped holes to efficiently clean the blades on the impeller. In addition, as the second tube rotates relative to the first tube to open different nozzles aligned with the strip-shaped holes, the cleaning medium ejected through the different nozzles will flush different axial parts of the impeller, and in conjunction with the impeller's own rotation, comprehensive cleaning of the impeller can be achieved. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a range hood according to one embodiment of this application;

[0025] Figure 2 A perspective view of the self-cleaning fan in the range hood of the above embodiments of this application is shown;

[0026] Figure 3 An exploded view of the self-cleaning fan according to the above embodiments of this application is shown;

[0027] Figure 4 A cross-sectional schematic diagram of the self-cleaning fan of the above embodiment of this application in a self-cleaning state is shown;

[0028] Figure 5 A cross-sectional schematic diagram of the self-cleaning fan of the above embodiment of this application in a non-clean state is shown;

[0029] Figure 6 A perspective view of a cleaning device for a fan in a self-cleaning fan according to the above embodiments of this application is shown;

[0030] Figure 7 An exploded view of the fan cleaning apparatus according to the above embodiments of this application is shown;

[0031] Figure 8 A schematic diagram of the structure of the fan cleaning device according to the above embodiments of this application is shown after omitting the drive component;

[0032] Figure 9 An exploded view of the fan cleaning device according to the above embodiments of this application is shown after omitting the drive assembly;

[0033] Figure 10 It shows Figure 9 An enlarged schematic diagram of part A in the fan cleaning device shown;

[0034] Figure 11 A cross-sectional schematic diagram of the fan cleaning device according to the above embodiment of this application is shown before and after the second pipe body is rotated;

[0035] Figure 12 A cross-sectional schematic diagram of the fan cleaning device of the above embodiment of this application is shown when the second pipe body is rotating.

[0036] Explanation of key component symbols:

[0037] 1. Self-cleaning fan; 10. Fan body; 11. Volute; 110. Clearance notch; 12. Impeller; 20. Fan cleaning device; 21. First pipe body; 210. Strip hole; 22. Second pipe body; 220. Spray hole; 23. Drive assembly; 231. First drive mechanism; 2311. First bracket; 2312. First stepper motor; 232. Second drive mechanism; 2321. Second bracket; 2322. Second stepper motor; 2323. Drive gear; 2324. Driven gear; 24. Guide tube; 25. Connecting mechanism; 251. Mounting base; 2511. End cover; 2512. Sealing cover; 252. Inner connector; 253. Outer connector; 254. Reset piece; 255. Guide tooth; 256. Mating tooth; 2. Smoke collection box assembly.

[0038] The above description of the main component symbols, together with the accompanying drawings and specific embodiments, provides a further detailed explanation of this application. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are 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 this application. However, this application can be implemented 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 this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] In the description of this application, 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", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] 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 application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," 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 expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In this application, unless otherwise expressly 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," "on top of," and "over" 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.

[0044] 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.

[0045] Considering that in existing technologies, a hole needs to be made in the annular wall of the volute housing to allow the rotating nozzle to extend inside, which not only easily leads to air leakage and affects the performance of the range hood fan, but also occupies the space originally used for sound-absorbing cotton, resulting in higher fan noise, this application provides a fan cleaning device, a self-cleaning fan, and a range hood. This device can seal the slotted area of ​​the volute tongue of the fan housing without occupying the space for sound-absorbing cotton, improving sealing performance and reducing the impact of the annular wall slot on the fan system performance.

[0046] refer to Figure 1 As shown, one embodiment of this application provides a range hood, which may include a smoke collection box assembly 2 and a self-cleaning fan 1 disposed within the smoke collection box assembly 2 for smoke extraction. 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 receiving box, and / or sensors to assist in completing the smoke extraction and self-cleaning functions; further details will not be elaborated upon here.

[0047] Specifically, such as Figures 2 to 5 As shown, the self-cleaning fan 1 may include a fan body 10 and a fan cleaning device 20. The fan body 10 includes a volute 11 and an impeller 12 rotatably disposed within the volute 11; a clearance notch 110 is provided at the volute tongue of the volute 11. The fan cleaning device 20 is disposed at the volute tongue of the volute 11. In this way, the self-cleaning fan 1 of this application does not need to have a groove cut in the annular wall of the volute 11, which can reduce the impact of the annular wall groove on the fan performance and also avoid occupying the space for arranging sound-absorbing cotton outside the annular wall, so as to arrange sound-absorbing cotton outside the annular wall and reduce fan noise. It is understood that in other examples of this application, the clearance notch 110 may also be formed in the annular wall of the volute 11, and the fan cleaning device 20 may be disposed in the annular wall of the volute 11.

[0048] More specifically, such as Figures 3 to 12As shown, the fan cleaning device 20 may include a first tube 21, a second tube 22, and a drive assembly 23. The first tube 21 has an axially extending strip-shaped hole 210 on its wall for aligning with the clearance notch 110 on the volute 11. The second tube 22 is rotatably fitted onto the first tube 21 and is used to connect to a cleaning medium supply component. The second tube 22 has a plurality of circumferentially spirally arranged nozzles 220 on its wall for spraying the cleaning medium. The drive assembly 23 includes a first drive mechanism 231 that is drivenly connected to the second tube 22. Under the action of the first drive mechanism 231, the second tube 22 rotates relative to the first tube 21 to drive the plurality of spray holes 220 to align sequentially with the strip hole 210, so that the spray holes 220 on the second tube 22 that are aligned with the strip hole 210 are opened to spray the cleaning medium to the impeller 12, while the other spray holes 220 on the second tube 22 are blocked by the first tube 21 to close.

[0049] It is worth noting that although the volute 11 has a groove at the volute tongue to form a clearance notch 110, the first tube 21 or the second tube 22 of the fan cleaning device 20, located outside the volute 11, will block the clearance notch 110 at the volute tongue. This prevents air leakage at this location and also makes full use of the space outside the volute tongue, without occupying the space for the sound-absorbing cotton arrangement outside the ring wall. It is understood that the second tube 22 can be rotatably fitted inside the first tube 21 or rotatably fitted outside the first tube 21.

[0050] Furthermore, when the second tube 22 rotates relative to the first tube 21 under the action of the first drive mechanism 231, only a portion of the nozzles 220 on the second tube 22 align with the strip hole 210 to be opened, while the other nozzles 220 are blocked by the first tube 21 to be closed, ensuring that the nozzles 220 possess a strong jet impact force; therefore, as Figure 4 As shown, when the self-cleaning fan 1 is in self-cleaning mode, the cleaning medium supply unit supplies cleaning medium to the second pipe 22, so that the cleaning medium entering the second pipe 22 is powerfully ejected from the nozzles 220 aligned with the strip hole 210 to efficiently clean the blades on the impeller 12. Furthermore, as the second pipe 22 rotates relative to the first pipe 21, different nozzles 220 are aligned with the strip hole 210 and opened. The cleaning medium ejected through the different nozzles 220 washes different axial parts of the impeller 12, and in conjunction with the rotation of the impeller 12 itself, a complete cleaning of the impeller 12 can be achieved.

[0051] Preferably, such as Figures 6 to 12As shown, only one nozzle 220 aligns with the strip hole 210 each time. Thus, when the second tube 22 rotates relative to the first tube 21 under the action of the first drive mechanism 231, only one nozzle 220 on the second tube 22 aligns with the strip hole 210 to be opened, while the other nozzles 220 are blocked by the first tube 21 to be closed. This ensures that the fan cleaning device 20 has only one jet throughout the entire cleaning process, maximizing the impact force of the jet and better cleaning the blades on the impeller 12.

[0052] More preferably, such as Figures 2 to 5 As shown, the second tube 22 is coaxially arranged with the first tube 21, and the rotation axis of the second tube 22 relative to the first tube 21 is parallel to the rotation axis of the impeller 12, so that the distance from each nozzle 220 on the second tube 22 to the impeller 12 is consistent when aligned with the strip hole 210; that is, the distance from the jet generation position of the fan cleaning device 20 to the blade position of the impeller 12 is consistent, which improves the consistency of the jet impact force and ensures the consistency of the cleanliness of each area on the blade.

[0053] For example, if an xyz coordinate system is constructed with the central axis of the second tube 22 as the z-axis, then the center coordinates (x, y, z) of each nozzle 220 on the second tube 22 can be expressed as:

[0054] , , ;

[0055] Where r1 represents the outer diameter of the second tube 22, θ represents the rotation angle of the center of the nozzle 220 relative to the x-axis, L represents the axial distance between two adjacent nozzles 220, and ɑ represents the central angle between the centers of two adjacent nozzles 220 relative to the central axis of the second tube 22.

[0056] Preferably, such as Figure 10 and Figure 11 As shown, the strip-shaped orifice 210 and the spray orifice 220 satisfy the following relationship:

[0057] and ;in, θ is the circumferential arc length of the center of two adjacent nozzles 220 on the outer peripheral wall of the second tube 22, r1 is the outer diameter of the second tube 22, α is the central angle of the center of the two adjacent nozzles 220 relative to the central axis of the second tube 22, θ2 represents the slotting angle of the strip hole 210, and r2 is the outer diameter of the first tube 21.

[0058] Thus, when the second tube 22 rotates relative to the first tube 21, one of the nozzles 220 falls into the slotted hole 210, while the previous nozzle 220 moves out of the slotted hole 210, ensuring that only one nozzle 220 is aligned with the slotted hole 210. It is understood that the slotting angle mentioned in this application refers to the central angle between the two edges of the slotted hole 210 and the central axis of the first tube 21.

[0059] In addition, such as Figure 2 and Figure 10 As shown, the nozzle 220 satisfies the following relationship:

[0060] Wherein, H is the axial length of the volute 11, L is the axial distance between two adjacent nozzles 220, α is the central angle between the centers of two adjacent nozzles 220 and the central axis of the second tube 22, and r3 is the radiation radius of the jet ejected through the nozzles 220 on the impeller 12. It is understood that the radiation radius mentioned in this application refers to the radius of the circular area formed by the jet ejected through the nozzles 220 scouring the blades of the impeller 12.

[0061] In this way, the rotation angle of the spiral line where the nozzle 220 is located is less than 360°, so that the lead of the spiral line where the nozzle 220 is located is greater than the axial length of the volute 11, thus preventing the nozzles 220 located at both ends of the second tube 22 from being aligned with the strip hole 210 at the same time.

[0062] It is worth noting that during the cleaning process of the impeller, the first tube 21 of the fan cleaning device 20 is fixed relative to the volute 11, while the second tube 22 rotates within the first tube 21, causing the nozzles 220 at different positions to spray cleaning medium to achieve a comprehensive cleaning effect. Since the conduit for conveying the cleaning medium cannot rotate at a large angle with the second tube 22, the fan cleaning device 20 of the above embodiment of this application may further include a conduit 24 for connecting to the cleaning medium supply component and a connecting mechanism 25 for rotatably connecting the conduit 24 to the second tube 22.

[0063] Specifically, such as Figures 6 to 12As shown, the connection mechanism 25 includes a mounting base 251 fixed to the first tube 21, an inner connector 252 fixedly connected to one end of the second tube 22 and rotatably inserted into the mounting base 251, an outer connector 253 fixedly connected to the conduit 24 and axially slidably inserted into the mounting base 251, a reset member 254 disposed between the outer connector 253 and the mounting base 251 to drive the outer connector 253 to axially abut against the inner connector 252, a guide tooth 255 fixed to the inner connector 252 and arranged annularly toward the outer connector 253, and a mating tooth 256 fixed to the outer connector 253 and meshing with the guide tooth 255.

[0064] Thus, as Figure 12 As shown, when the second tube 22 rotates relative to the first tube 21 to a suitable angle, the inner connector 252 will rotate relative to the outer connector 253 under the drive of the second tube 22; at this time, the outer connector 253 will move away from the inner connector 252 under the action of the mating teeth 256 and the guide teeth 255, so that a gap appears between the outer connector 253 and the inner connector 252, achieving the effect that the second tube 22 rotates while the conduit 24 does not rotate. Furthermore, as... Figure 11 As shown, after the second tube 22 rotates to a suitable angle relative to the first tube 21, the outer connector 253 will approach the inner connector 252 under the action of the reset member 254, so that the guide tooth 255 and the mating tooth 256 mesh with each other, ensuring that the outer connector 253 and the inner connector 252 are stably kept in the docking state; at this time, a certain nozzle 220 of the second tube 22 is just aligned with the strip hole 210 of the first tube 21.

[0065] More specifically, such as Figure 9 , Figure 11 as well as Figure 12 As shown, the mounting base 251 may include an end cap 2511 fixedly connected to one end of the first tube 21 and a sealing cap 2512 detachably connected to the end cap 2511; the reset member 254 is implemented as a spring abutting between the outer connector 253 and the sealing cap 2512 to apply an elastic force toward the inner connector 252 to the outer connector 253. It is understood that in other examples of this application, the reset member 254 may also be implemented as a magnetic component to utilize magnetic force to achieve the desired reset function.

[0066] Preferably, such as Figure 10 and Figure 11 As shown, the guide tooth 255 satisfies the following relationship:

[0067] Where L2 is the arc length of the outer wall of the guide tooth 255, r4 is the distance between the outer wall of the guide tooth 255 and the central axis of the second tube 22, and α is the central angle between the centers of two adjacent nozzles 220 and the central axis of the second tube 22.

[0068] In this way, the guide tooth 255 can correspond one-to-one with the spray hole 220 on the second tube 22, so that each time the guide tooth 255 and the mating tooth 256 mesh, the corresponding spray hole 220 on the second tube 22 falls into the strip hole 210. This ensures that the inner connector 252 and the outer connector 253 are fully connected, and that there is only one jet throughout the entire cleaning process.

[0069] It is worth noting that, such as Figures 3 to 5 As shown, the first tube 21 is rotatably fitted outside the second tube 22 to block the clearance notch 110 at the volute tongue; the drive assembly 23 of this application may further include a second drive mechanism 232 drivenly connected to the first tube 21, the first tube 21 being rotated relative to the volute 11 under the action of the second drive mechanism 232, so as to drive the strip hole 210 to align with or rotate away from the clearance notch 110. Thus, as Figure 4 As shown, when the second drive mechanism 232 drives the first tube 21 to rotate relative to the volute 11 to align the strip-shaped hole 210 with the clearance notch 110, the cleaning medium sprayed by the nozzle 220 aligned with the strip-shaped hole 210 can wash the blades of the impeller 12 through the clearance notch 110, thus putting the self-cleaning fan 1 into a self-cleaning state; and as Figure 5 As shown, when the second drive mechanism 232 drives the first tube 21 to rotate relative to the volute 11 to cause the strip hole 210 to rotate away from the clearance notch 110, the outer peripheral wall of the first tube 21 will completely block the clearance notch 110, so that the self-cleaning fan 1 is in a non-clean state, preventing the airflow in the volute 12 from forming a vortex at the strip hole 210, and avoiding the adverse effects of the strip hole 210 on the performance of the fan system.

[0070] In other words, such as Figure 5 As shown, when the cleaning device 20 for the fan is in a non-cleaning state, the strip-shaped hole 210 of the first tube 21 rotates away from the clearance notch 110 to be outside the volute 11, preventing the nozzle 220 that falls into the strip-shaped hole 210 from remaining inside the volute 11 and being contaminated or blocked by oil fumes when the range hood is working; at the same time, the outer peripheral wall of the first tube 21 completely seals the clearance notch 110, which not only prevents the oil fumes inside the volute 11 from flowing out of the clearance notch 110 and contaminating the nozzle 220 or the housing, but also prevents the loss of wind pressure inside the volute 11, avoiding disruption of airflow and affecting the oil fume extraction effect.

[0071] Preferably, such as Figures 2 to 12 As shown, both the first tube 21 and the second tube 22 have annular cross-sections, and the outer peripheral wall of the first tube 21 is tangent to the edge of the clearance notch 110. This allows the outer peripheral wall of the first tube 21 to maintain a smooth connection at the volute tongue of the volute housing 11, minimizing the adverse effects of the clearance notch 110 on the performance of the fan system. Furthermore, the cylindrical structure of the first tube 21 perfectly matches the volute tongue of the volute housing 11, reducing the size of the cleaning device and significantly improving space utilization.

[0072] For example, such as Figure 6 and Figure 7 As shown, the first drive mechanism 231 includes a first bracket 2311 fixed to the volute 11 and a first stepper motor 2312 mounted on the first bracket 2311 and coaxially fixedly connected to the second tube 22, so that the second tube 22 can rotate gradually relative to the first tube 21 under the drive of the first stepper motor 2312, so that after each rotation, there is only one spray hole 220 in the strip hole 210.

[0073] In addition, such as Figure 6 and Figure 7 As shown, the second drive mechanism 232 may include a second bracket 2321 fixed to the volute 11, a second stepper motor 2322 mounted on the second bracket 2321, a drive gear 2323 fixedly connected to the output shaft of the second stepper motor 2322, and a driven gear 2324 fixedly connected to the first tube 21 and meshing with the drive gear 2323, so that the first tube 21 can rotate relative to the volute 11 at a certain angle under the drive of the second stepper motor 2322, ensuring that the strip hole 210 can be aligned with or rotated away from the clearance notch 110 of the volute 11.

[0074] Optionally, such as Figure 6 and Figure 7 As shown, the first drive mechanism 231 and the second drive mechanism 232 are located at opposite ends of the first tube 21, respectively, and are arranged on the front and rear sides of the volute 11 to avoid structural interference between the two drive mechanisms.

[0075] Preferably, such as Figure 6 and Figure 7 As shown, the driven gear 2324 is interference-fitted with the end cap 2511 to achieve a fixed connection between the driven gear 2324 and the first tube 21.

[0076] It is worth noting that the self-cleaning method of the self-cleaning fan 1 includes the following steps: 1) Activate the self-cleaning function; 2) Determine whether the first pipe body 21 and the second pipe body 22 have reached the initial position: if yes, set n=0 and proceed to the next step 3); if no, control the first drive mechanism 231 and the second drive mechanism 232 of the drive assembly 23 to drive the second pipe body 22 and the first pipe body 21 to rotate in the reset direction respectively; 3) Control the impeller 12 to start intermittently according to the set speed; 4) Control the heating module and water pump of the cleaning medium supply component to work, so that water or steam is sprayed out from the nozzle 220 of the second pipe body 22; 5) Determine whether the set time T has been reached: if yes, set n=n+1 and proceed to the next step 6). If not, continue with step 4); 6) Control the cleaning medium supply to stop working and control the first drive mechanism 231 to drive the second tube 22 to rotate relative to the first tube 21 by a preset angle α; 7) Control the cleaning medium supply to work again, so that the nozzle 220 of the second tube 22 sprays out water or steam; 8) Determine whether the set time T has been reached: if yes, let n = n + 1 and execute the next step 9); if not, continue with step 7); 9) Determine whether n is greater than or equal to 360 / α: if yes, control the second drive mechanism 232 to drive the first tube 21 to rotate in the opposite direction by a predetermined angle greater than the slotting angle θ2, and shut off the cleaning medium supply; if not, return to step 6 above).

[0077] Furthermore, the range hood of this application can also be controlled by a voice module, which is equipped with a controller, a voice receiving module, and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the range hood to perform corresponding operations, thereby realizing the intelligent control of the range hood and improving the user experience.

[0078] 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.

[0079] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are quite specific and detailed. However, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A cleaning device for fans, characterized in that, include: The first tube has an axially extending strip hole on its wall for aligning with the clearance notch on the volute. The second tube is rotatably fitted onto the first tube and is used to connect with the cleaning medium supply component; and the tube wall of the second tube is provided with a plurality of spray holes arranged in a circumferential spiral for spraying the cleaning medium. as well as The drive assembly includes a first drive mechanism that is driven to the second tube body; The second tube rotates relative to the first tube under the action of the first driving mechanism, so as to drive the multiple spray holes to align with the strip hole in sequence.

2. The fan cleaning device according to claim 1, characterized in that, The number of nozzles aligned with the strip-shaped hole each time is one.

3. The fan cleaning device according to claim 1, characterized in that, The second tube is arranged coaxially with the first tube, and the axis of rotation of the second tube relative to the first tube is parallel to the axis of rotation of the impeller.

4. The fan cleaning device according to claim 1, characterized in that, The strip-shaped orifice and the spray orifice satisfy the following relationship: and ;in, θ is the circumferential arc length of the centers of two adjacent nozzles on the outer peripheral wall of the second tube, r1 is the outer diameter of the second tube, α is the central angle of the centers of the two adjacent nozzles relative to the central axis of the second tube, θ2 represents the slotting angle of the strip hole, and r2 is the outer diameter of the first tube.

5. The fan cleaning device according to claim 1, characterized in that, The nozzle satisfies the following relationship: Wherein, H is the axial length of the volute, L is the axial distance between two adjacent nozzles, α is the central angle between the centers of two adjacent nozzles relative to the central axis of the second tube, and r3 is the radiation radius of the jet ejected through the nozzle on the impeller.

6. The fan cleaning apparatus according to any one of claims 1 to 5, characterized in that, The fan cleaning device further includes a conduit for connecting to a cleaning medium supply unit and a connecting mechanism for rotatably connecting the conduit to the second pipe body. The connecting mechanism includes a mounting base fixed to the first tube body, an inner connector fixedly connected to one end of the second tube body and rotatably inserted into the mounting base, an outer connector fixedly connected to the conduit and axially slidably inserted into the mounting base, a reset member disposed between the outer connector and the mounting base to drive the outer connector to axially abut against the inner connector, guide teeth fixed to the inner connector and arranged annularly toward the outer connector, and mating teeth fixed to the outer connector and meshing with the guide teeth.

7. The fan cleaning device according to claim 6, characterized in that, The mounting base includes an end cap fixedly connected to one end of the first tube and a sealing cap detachably connected to the end cap; the reset element is a spring abutting between the outer connector and the sealing cap.

8. The fan cleaning device according to claim 6, characterized in that, The guide teeth satisfy the following relationship: Wherein, L2 is the arc length of the outer wall of the guide tooth, r4 is the distance of the outer wall of the guide tooth relative to the central axis of the second tube, and α is the central angle between the centers of two adjacent nozzles relative to the central axis of the second tube.

9. The fan cleaning apparatus according to any one of claims 1 to 5, characterized in that, The drive assembly further includes a second drive mechanism that is driven to connect with the first tube body. The first tube body is fitted outside the second tube body. Under the action of the second drive mechanism, the first tube body is used to rotate relative to the volute to drive the strip hole to align with or rotate away from the clearance notch.

10. The fan cleaning device according to claim 9, characterized in that, Both the first tube and the second tube have an annular cross-section, and the outer peripheral wall of the first tube is tangent to the edge of the clearance notch.

11. The fan cleaning device according to claim 9, characterized in that, The first drive mechanism includes a first bracket for fixing to the volute and a first stepper motor mounted on the first bracket and fixedly connected coaxially to the second tube. The second drive mechanism includes a second bracket for fixing to the volute, a second stepper motor mounted on the second bracket, a drive gear fixedly connected to the output shaft of the second stepper motor, and a driven gear fixedly connected to the first tube and meshing with the drive gear.

12. A self-cleaning fan, characterized in that, include: The main body of the fan includes a volute and an impeller rotatably disposed within the volute, wherein a clearance notch is provided at the volute tongue or the annular wall of the volute. and The fan cleaning device as described in any one of claims 1 to 11 is provided at the volute tongue or annular wall of the volute to seal the clearance gap.

13. A range hood, characterized in that, include: Smoke collection box assembly; and The self-cleaning fan as described in claim 12 is disposed within the smoke collection box assembly.

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