Self-cleaning fan and range hood

Abstract

The present invention relates to a self-cleaning fan and a range hood, which can ensure a large average flushing force while achieving full-range cleaning by rotating a nozzle, so as to achieve a better cleaning effect. The self-cleaning fan includes a fan main body and a cleaning device. The fan main body includes a volute and an impeller rotatably arranged in the volute. A plurality of blades are arranged circumferentially on the impeller. The cleaning device includes a cleaning medium supply member rotatably arranged relative to the volute. The rotation axis of the cleaning medium supply member is perpendicular to the central axis of the impeller, and the spray angle difference y between the cleaning medium supply member when cleaning the two axial ends of the blade and the long-distance ratio x between the axial length of the blade to be cleaned and the equivalent axis distance satisfies the relational expression: y ≤ -0.184x<supgt;2< / supgt> - 2.6392x + 76.359; wherein the equivalent axis distance is the vertical distance between the intersection point of the spray lines of the cleaning medium supply member when cleaning the two axial ends of the blade and the blade to be cleaned.

Description

[0001] This application claims the priority of a Chinese patent application with the application number 202111284408.2 and the application title "Fan Cleaning Device and Range Hood for Range Hoods" filed with the Chinese Patent Office on November 1, 2021, the entire content of which is incorporated herein by reference. Technical Field

[0002] The present invention relates to the technical field of kitchen equipment, and particularly to a self-cleaning fan and a range hood. Background Art

[0003] With the continuous progress of the self-cleaning technology of range hoods, steam cleaning or water cleaning has been widely used in the self-cleaning field of range hoods. Its basic principle is that a steam generator generates steam or a water pump pumps water, and the steam or water is transported to the nozzle at the end of the spray pipe. The steam or water quickly sprays out from the nozzle to wash the impeller and the volute for cleaning.

[0004] Currently, fixed holes are generally opened on the spray pipe, and the number of holes is generally more than 3. However, this cleaning method has the following deficiencies: First, when cleaning, the steam or water sprays out from the fixed nozzles. Since there are a limited number of nozzles, the flushing force between the nozzles is very weak, and the cleaning effect is not good. Second, due to the large number of openings, with a certain power of the steam generator or pump, the steam pressure or water pressure coming out of the nozzles is correspondingly low and unstable, resulting in a poor cleaning effect.

[0005] In order to increase the flushing force, improve the cleaning effect, and achieve comprehensive cleaning, as the applicant's prior application, the invention patent "A Cleaning Device for a Range Hood Fan System" with the application number CN201711480573.9 (publication number CN109990332A) and the utility model patent "A Range Hood with a Self-Cleaning Function" with the application number CN201920819655.X (publication number CN210197396U) both propose the design idea of comprehensively cleaning the impeller by moving the cleaning medium supply member to improve the cleaning effect.

[0006] However, for the first above-mentioned solution, it is necessary to open a long strip-shaped relief hole extending along the moving direction of the cleaning medium supply member on the volute, which requires a large modification to the original structure of the fan and is likely to affect the fan performance. If an additional shielding part is provided, there is a problem that the viscous grease will stick to the shielding part after long-term use, resulting in its inability to open or close tightly. Although the second above-mentioned solution does not require opening a large relief hole, the horizontal feeding type cleaning medium supply member therein requires a large amount of end-side space, and it is difficult for the current existing product dimensions to support such a large space. Summary of the Invention

[0007] One advantage of the present invention is to provide a self - cleaning fan and a range hood, which can widen the cleaning range while occupying a relatively small space.

[0008] Another advantage of the present invention is to provide a self - cleaning fan and a range hood. In one embodiment of the present invention, the self - cleaning fan can achieve full - coverage cleaning of the impeller when opening a relatively small relief hole, so as to reduce the modification of the original structure of the fan and reduce the impact on the performance of the fan.

[0009] Another advantage of the present invention is to provide a self - cleaning fan and a range hood. In one embodiment of the present invention, the self - cleaning fan can ensure a relatively large average flushing force while achieving full - range cleaning by rotating the nozzle, so as to achieve a better cleaning effect.

[0010] Another advantage of the present invention is to provide a self - cleaning fan and a range hood. In one embodiment of the present invention, the self - cleaning fan can reduce or avoid the adverse impact of oil stains on the performance of the driving mechanism.

[0011] Another advantage of the present invention is to provide a self - cleaning fan and a range hood. To achieve the above - mentioned purposes, expensive materials or complex structures are not required in the present invention. Therefore, the present invention successfully and effectively provides a solution, not only providing a simple self - cleaning fan and a range hood, but also increasing the practicability and reliability of the self - cleaning fan and the range hood.

[0012] To achieve at least one of the above - mentioned advantages or other advantages and purposes of the present invention, the present invention provides a self - cleaning fan, comprising:

[0013] A fan main body, the fan main body includes a volute and an impeller rotatably arranged in the volute, and a plurality of blades are arranged in the circumferential direction of the impeller; and

[0014] A cleaning device, the cleaning device includes a cleaning medium supply member rotatably arranged relative to the volute, the rotation axis of the cleaning medium supply member is perpendicular to the central axis of the impeller, and the spray angle difference y between the cleaning of the two axial ends of the blade and the long - distance ratio x between the axial length of the blade to be cleaned and the equivalent axial distance satisfies the relationship: y ≤ - 0.184x 2 -2.6392x + 76.359; wherein the equivalent axial distance is the vertical distance between the intersection point of the spray rays of the cleaning medium supply member when cleaning the two axial ends of the blade and the blade to be cleaned.

[0015] According to an embodiment of the present application, the spray angle difference y of the cleaning medium supply member when cleaning the axial ends of the blade is less than or equal to 45°.

[0016] According to an embodiment of the present application, the cleaning medium supply member has equal spray angles when cleaning both axial ends of the blade.

[0017] According to one embodiment of the present application, the cleaning medium supply member includes a moving part extending circumferentially along the rotation axis and a nozzle tilted outward from a first end of the moving part, and the angle between the spray line of the nozzle and the tangent line of the first end of the moving part is greater than 0° and less than or equal to 90°.

[0018] According to one embodiment of the present application, an angle between a spray line of the nozzle and a tangent line of the first end of the moving part is equal to 90°.

[0019] According to an embodiment of the present application, the vertical projection position of the rotation axis of the cleaning medium supply member on the central axis of the impeller is equidistant from the axial ends of the impeller.

[0020] According to one embodiment of the present application, a clearance hole is opened on the volute of the fan body, the rotation axis of the cleaning medium supply member is located outside the volute, and the moving part is rotated around the rotation axis to drive the nozzle to enter and exit the volute through the clearance hole.

[0021] According to one embodiment of the present application, the cleaning device further includes a driving mechanism fixed to the volute and a rotating seat drivably connected to the driving mechanism, the rotating seat includes a rotating shaft providing the rotation axis and a connecting arm extending outward from the outer peripheral wall of the rotating shaft, the rotating shaft is coaxially connected to the power output end of the driving mechanism, and the end of the connecting arm is fixedly connected to the second end of the moving part of the cleaning medium supply member.

[0022] According to one embodiment of the present application, the clearance hole is located on the outer peripheral wall of the volute adjacent to the air inlet of the fan body.

[0023] According to an embodiment of the present application, the moving part has a hollow channel connected to the nozzle, and the hollow channel of the moving part is used to transport the cleaning medium to the nozzle.

[0024] According to another aspect of the present application, the present application further provides a range hood, comprising:

[0025] a housing; and

[0026] In any of the self-cleaning fans described above, the fan body of the self-cleaning fan is arranged inside the casing. Description of the Drawings

[0027] Figure 1 Schematic perspective view of Embodiment 1 of the range hood of the present invention;

[0028] Figure 2 is Figure 1 Schematic perspective view after omitting the housing (the cleaning medium supply member is in the initial position);

[0029] Figure 3 is Figure 2 Longitudinal sectional view after omitting the water tank, steam generator and water receiving box in ;

[0030] Figure 4 is Figure 3 Left view after omitting the volute and drive device in ;

[0031] Figure 5 is Figure 4 Left view after the cleaning medium supply member rotates to the middle position in ;

[0032] Figure 6 is Figure 5 Left view after the cleaning medium supply member rotates to the end position in ;

[0033] Figure 7 is Figure 3 Left view after the cleaning medium supply member rotates to the middle plate position when the blower in is a double-inlet blower;

[0034] Figure 8 is Figure 2 Schematic diagram of the relative position between the cleaning medium supply member and the blades during the rotation of the cleaning medium supply member in ;

[0035] Figure 9 Flowchart of the self-cleaning prompt of the range hood in Embodiment 1 of the present invention;

[0036] Figure 10 Flowchart of the global cleaning of the range hood in Embodiment 1 of the present invention (taking time as the sampling interval);

[0037] Figure 11 Flowchart of the global cleaning of the range hood in Embodiment 1 of the present invention (taking the number of steps as the sampling interval);

[0038] Figure 12 Flowchart of the oil-stained area collection of the range hood in Embodiment 1 of the present invention;

[0039] Figure 13 Longitudinal sectional view of the blower, cleaning medium supply member and drive device in the non-working state in Embodiment 2 of the range hood of the present invention;

[0040] Figure 14 Schematic three-dimensional structure diagram of the fan, cleaning medium supply member and drive device in the non-working state in Embodiment 3 of the range hood of the present invention;

[0041] Figure 15 Longitudinal sectional view of the fan, cleaning medium supply member and drive device in the working state in Embodiment 3 of the range hood of the present invention;

[0042] Figure 16 Longitudinal sectional view of the fan, cleaning medium supply member and drive device in the non-working state in Embodiment 4 of the range hood of the present invention;

[0043] Figure 17 Longitudinal sectional view of the fan, cleaning medium supply member and drive device in the working state in Embodiment 4 of the range hood of the present invention;

[0044] Figure 18 Schematic sectional view of a range hood according to a preferred embodiment of the present invention;

[0045] Figure 19 Shows a first example of a self-cleaning fan in the range hood according to the above preferred embodiment of the present invention;

[0046] Figure 20 Shows a schematic diagram of the principle of the self-cleaning fan according to the above first example of the present invention;

[0047] Figure 21 Shows a second example of a self-cleaning fan in the range hood according to the above preferred embodiment of the present invention;

[0048] Figure 22 Shows a schematic diagram of the principle of the self-cleaning fan according to the above second example of the present invention;

[0049] Figure 23 Shows a schematic diagram of the fitting curve of the spray angle difference y and the long-distance ratio x in the self-cleaning fan according to the above preferred embodiment of the present invention.

[0050] Description of Main Component Symbols: 1. Housing; 2. Fan; 21. Volute; 210. Volute tongue; 211. Relief hole; 212. Drain hole; 22. Impeller; 221. Blades; 222. Middle plate; 23. Driving member; 3. Cleaning medium supply member; 30. Penetrating portion; 301. Inlet; 302. Outlet; 31. Rotating seat; 311. Rotating shaft; 312. Connecting arm; 3'. Cleaning medium supply member; 30'. Penetrating portion; 31'. First transmission member; 311'. First rack; 312'. First gear; 313'. Elastic limiting block; 302'. Outlet; 3". Cleaning medium supply member; 30". Penetrating portion; 31". Second transmission member; 311". Second rack; 312". Second gear; 302". Outlet; 313". Limiting sleeve; 3131". Bending channel; 4. Driving device; 5. Water tank; 6. Steam generator; 7. Water receiving box; 8. Sensor; 1A. Range hood; 10A. Housing; 20A. Self-cleaning fan; 21A. Fan main body; 211A. Volute; 2110A. Relief hole; 212A. Impeller; 210A. Central axis; 2120A. Blades; 22A. Cleaning device; 221A. Cleaning medium supply member; 220A. Rotation axis; 2211A. Moving portion; 22110A. Hollow channel; 22111A. First end; 22112A. Second end; 2212A. Nozzle; 222A. Driving mechanism; 223A. Rotating seat; 2231A. Rotating shaft; 2232A. Connecting arm.

[0051] The above description of main component symbols further elaborates on the present invention in conjunction with the accompanying drawings and specific embodiments. Specific Embodiments

[0052] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0053] It should be noted that when a component is referred to as being "installed on" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "arranged on" another component, it can be directly arranged on the other component or there may be an intermediate component at the same time. When a component is considered to be "fixed to" another component, it can be directly fixed to the other component or there may be an intermediate component at the same time.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0055] Embodiment 1:

[0056] like Figures 1 to 12 The first preferred embodiment of the range hood of the present invention is shown in FIG.

[0057] The fan 2 is disposed in the housing 1, and includes a volute 21, an impeller 22 disposed in the volute 21, and a driving member 23 for driving the impeller 22 to rotate. Figure 3 As shown, a clearance hole 211 is opened on the annular wall of the volute 21 at the position of the volute tongue 210, and a drainage hole 212 is opened at the bottom of the volute 21; and a plurality of blades 221 extending in the axial direction are arranged at intervals along the circumferential direction on the impeller 22.

[0058] The cleaning medium supply member 3 is tubular, and has a front section, a middle section, and a rear section in sequence along the flow direction of the cleaning medium. The end surface of the front section of the cleaning medium supply member 3 has an inlet 301 for the cleaning medium to enter, and the middle and rear sections of the cleaning medium supply member 3 are recorded as a penetration portion 30. The penetration portion 30 is a rigid member that can extend into the volute 21. The end surface of the penetration portion 30 has an outlet 302 for the cleaning medium to eject. In this embodiment, the cleaning medium supply member 3 is a rigid member as a whole.

[0059] The driving device 4 is a motor, which is installed at the volute tongue 210 of the volute 21, and its power output shaft is connected to the cleaning medium supply member 3 through the rotating seat 31. Specifically, the rotating seat 31 includes a rotating shaft 311 and a connecting arm 312, and the rotating shaft 311 is coaxially connected to the power output shaft of the driving device 4; the first end of the connecting arm 312 is connected to the outer peripheral wall of the rotating shaft 311, and the second end is connected to the front section of the cleaning medium supply member 3.

[0060] The driving device 4 is started to drive the penetration portion 30 of the cleaning medium supply member 3 to pass through the clearance hole 211 and rotate relative to the axis of the rotating shaft 311 to perform a swinging motion (i.e., a reciprocating motion around a certain axis within a certain angle range), so that the cleaning medium supply member 3 has at least two states:

[0061] In the working state, the outlet 302 of the penetration portion 30 extends into the volute 21 and faces the blade 221 of the impeller 22, and the cleaning medium ejected from the outlet 302 of the penetration portion 30 is ejected to the injection area at the blade 221 and reciprocates between the two axial ends of the impeller 22 to clean the impeller 22, and the cleaning range of the cleaning medium covers the entire impeller 22;

[0062] In a non-working state, the outlet 302 of the penetration portion 30 exits the volute 21 to prevent the outlet 302 of the penetration portion 30 from being blocked.

[0063] In the present invention, the "injection area" refers to the range formed when the cleaning medium contacts the blades 221 of the impeller 22 after being ejected from the outlet 302, and does not include the area formed when the cleaning medium flows along the blades 221 or drips from the blades 221 after being ejected onto the blades 221. The shape and size of the injection area are related to the structure and shape of the outlet 302 itself and the movement mode of the penetration portion 30. The present invention does not limit the shape and size of the injection area, as long as the injection area can clean the part between the two axial ends of the impeller 22 through reciprocating motion when the cleaning device is working.

[0064] In addition, if Figure 3 As shown, since the movement trajectory of the penetration part 30 at least at the end away from the outlet 302, i.e., point B, is a non-linear shape, when the outlet 302 of the penetration part 30 moves to the clearance hole 211, the minimum distance L between the end of the penetration part 30 away from the outlet 302, i.e., point B, and the volute 21 is less than the length of the penetration part 30. In this way, the cleaning medium supply part 3 can cover a larger cleaning range in a smaller activity space. On the one hand, it occupies less space, and on the other hand, it requires less modification to the original structure of the fan (i.e., only one clearance hole 211 for the penetration part 30 to pass through needs to be opened on the volute 21), which does not affect the performance of the fan.

[0065] In order to ensure that the jet area where the cleaning medium ejected from the outlet 302 of the penetrating part 30 hits the blade 221 reciprocates between the two axial ends of the impeller 22, the rotation axis of the penetrating part 30 is arranged at an angle with the central axis of the impeller 22 (that is, the included angle between the rotation axis of the penetrating part 30 and the central axis of the impeller 22 is greater than 0° and less than 180°, which means that the rotation axis of the penetrating part 30 is neither parallel nor overlapping with the central axis of the impeller 22). The reason is that when the rotation axis of the penetrating part 30 is parallel or overlapping with the central axis of the impeller 22, the jet area where the cleaning medium ejected from the outlet 302 of the penetrating part 30 hits the blade 221 will reciprocate circumferentially along the impeller 22. In this way, when the rotating penetrating part 30 jets steam to the rotating impeller 22, the above jet area can only cover a very narrow annular surface on the outer circumference of the impeller 22 and cannot cover other positions of the impeller 22 in the axial direction. The rotation of the penetrating part 30 loses its meaning because in this case, the same cleaning effect can be achieved even if the penetrating part 30 does not rotate. In this embodiment, the rotation axis of the penetrating part 30 is perpendicular to the central axis of the impeller 22, and the plane where the rotation trajectory of any point at the outlet 302 of the penetrating part 30 is located is arranged parallel to the central axis of the impeller 22. In this way, the jet area where the cleaning medium ejected from the outlet 302 of the penetrating part 30 hits the blade 221 will move along the axial direction of the impeller 22, that is, the length direction of the blade 221, and the travel is the shortest. Of course, in actual application, it may not be possible to accurately ensure that the movement trajectory of the above jet area is exactly parallel to the central axis of the impeller 22. When the movement trajectory deviates from the central axis of the impeller 22 by a certain angle, the entire impeller 22 can still be cleaned, but the travel of the jet area will be relatively extended.

[0066] In order to avoid interference between the penetrating part 30 and the volute 21 during the rotation process when the aperture of the relief hole 211 is small, the part of the penetrating part 30 passing through the relief hole 211 during the movement is an arc segment, and the center of the arc segment is located on the axis of the rotating shaft 311 (that is, the rotation axis of the penetrating part 30). Denote the outer diameter of the arc segment as D1 and the aperture of the relief hole 211 as D2. The relationship between D1 and D2 satisfies: D1 ≤ D2 ≤ 1.2D1. Of course, it is best to design D1 = D2, so that it can be ensured that during the rotation process, the arc segment of the penetrating part 30 always blocks the relief hole 211. On the one hand, it can prevent the cleaning medium and oil in the volute 21 from splashing out through the relief hole 211, and on the other hand, it can avoid affecting the normal operation of the fan 2. Of course, in actual application, the shape of the relief hole 211 can also be designed into a square or other shapes, as long as the cross-sectional shape of the arc segment is adapted to the shape of the relief hole 211.

[0067] In addition, through experimental verification, as Figure 7As shown, for a double-inlet impeller (the impeller 22 has a middle plate 222), generally, the front end is the main air inlet, and the rear end is the secondary air inlet. The oil stains are concentrated at the position where the blades 221 pass through the middle plate 222. Based on the above phenomenon, in this embodiment, when arranging the cleaning medium supply member 3, it will be arranged close to the middle plate 222 so that when the injection area corresponds to the middle plate 222 (that is, the injection area moves to the position where the blades 221 pass through the middle plate 222), the injection path from the outlet 302 of the piercing part 30 to the impeller 22 is the shortest. Under the same injection conditions, the shorter the injection path, the greater the injection force, which helps to uniformly clean the entire impeller according to the distribution amount of the oil stains.

[0068] In order to ensure that the flushing time of each point on the blade 221 is basically the same, it is necessary to set the reciprocating motion of a point A in the axial direction between the two end parts of the impeller 22 in the axial direction of the injection area where the cleaning medium is shot at the impeller 22 to be a uniform motion. The motion of the piercing part 30 should be set as a variable motion. The derivation formula is as follows:

[0069] As Figure 8 shown, θ is the angular position corresponding to the piercing part 30 at different times. Taking Δt as the unit time, the variable motion is decomposed into several uniform motions. Select any one of the uniform motions. Then, when Δt approaches 0, the rotation angle Δθ of the piercing part 30 within this unit time is:

[0070]

[0071] Since v0t = h tanθt, that is

[0072] Therefore,

[0073] Among them, the point A in the injection area where the cleaning medium is shot at the impeller 22 is defined as being shot from the point A0 at the outlet 302 of the piercing part 30; ω is the rotational speed of the piercing part 30; θ is the rotation angle of the piercing part 30; h is the minimum distance from the rotation center of the point A0 at the outlet 302 of the piercing part 30 to the blade 221 where the point A in the injection area is shot; v0 is the moving speed of the point A in the injection area.

[0074] In this embodiment, when t = 0, θ = 0.

[0075] The water tank 5 has a water inlet end and a water outlet end and is used for storing water. In this embodiment, the top of the water tank 5 has an opening as the water inlet end.

[0076] The steam generator 6 has a water inlet end and a steam outlet end, and is capable of heating water to generate steam. The water inlet end of the steam generator 6 is connected to the water outlet end of the water tank 5 through a water pipe 61, and the steam outlet end of the steam generator 6 is connected to the inlet 301 of the cleaning medium supply member 3 through a steam pipe 62. In this embodiment, a water suction pump is integrated at the water inlet end of the steam generator 6.

[0077] The top of the water receiving box 7 has an opening. The water receiving box 7 is located directly below the drain hole 212 of the volute 21 and is used to receive the sewage discharged from the drain hole 212. In this embodiment, the right side wall of the water tank 5 and the left side wall of the water receiving box 7 share a side wall, which is convenient for installation.

[0078] Since self-cleaning requires the user to add clean water and pour out waste water, the amount of water is a factor that the user cares about. If too much water is required during the cleaning process, it will make it difficult for women with less strength to operate, affecting the user experience and reducing the product satisfaction; similarly, if the user needs to wait beside the range hood and add clean water and pour out waste water multiple times, it will dissatisfy office workers with a fast work rhythm. Therefore, the water consumption of the range hood self-cleaning technology should be small, and thus the capacities of the water tank 5 and the water receiving box 7 are approximately 650 ml.

[0079] The sensor 8 is installed at a position near the outlet 302 of the passing part 30 and is used to detect the amount of oil stains at various positions along the axial direction between the two end parts of the impeller 22 in the axial direction. In this embodiment, the sensor 8 is a humidity sensor. After the impeller 22 is cleaned, there will be local remaining oil stains. After the impeller 22 is thrown off at high speed, the water and flowing oil stains on the blade 221 are thrown off, and its metal surface is in a dry state. However, the surface humidity of the oil stain is much higher than that of the metal blade surface after adsorbing water. At this time, the oil stain with a high water content can be detected by the humidity sensor to locate the oil stain. Specifically, since the sensor 8 will rotate synchronously during the rotation of the passing part 30, the detection area where the detection medium emitted from the sensor 8 shoots towards the blade 221 will reciprocally move along the axial direction of the impeller 22, that is, the length direction of the blade 221, so as to detect the humidity of the corresponding detection area. After the impeller 22 is thrown off at high speed, the water at the position with less oil stain is easily thrown off, and the water residue at the position with more oil stain will be relatively more. Therefore, the higher the humidity, the more the amount of oil stain; by extension, a surface temperature detection sensor can also be used. Since the thermal conductivity coefficients of the metal and the oil stain are different, within a short time of centrifugal throwing off, there will be an obvious temperature difference between the metal surface and the oil stain surface. The oil stain can be identified by using the thermal imaging principle to achieve the purpose of detecting the oil stain.

[0080] Of course, the above-mentioned cleaning medium supply member 3, driving device 4, water tank 5, steam generator 6, water receiving box 7 and sensor 8 can also form an independent cleaning device. This cleaning device is not limited to cleaning the impeller 22, and can also be used to clean other components in the range hood that are stained with oil, such as the inner wall of the volute 21. In this cleaning device, the penetrating portion 30 of the cleaning medium supply member 3 serves as a moving portion, and swings under the drive of the driving device 4, so that the outlet 302 of the moving portion has an arc-shaped movement trajectory. In this way, under the condition that the activity range of the cleaning medium supply member 3 is small, the cleaning medium ejected from the outlet 302 of the moving portion can cover a large cleaning range. This cleaning device occupies a small space and has a wide cleaning range. In addition, since the moving portion is arc-shaped and the center of the moving portion is located on the rotation axis of the moving portion, the activity range of the moving portion can be minimized as much as possible to avoid occupying too much space.

[0081] The working principle of this embodiment is as follows:

[0082] (1) Start the driving member 23, driving device 4 and steam generator 6. The water in the water tank 5 enters the steam generator 6 through the water pipe 61. The steam generator 6 heats the water to generate steam, and transports the steam to the cleaning medium supply member 3 through the steam pipe 62. The rotating penetrating portion 30 sprays steam at the rotating impeller 22, so that the spraying area of the steam reciprocates axially between the front end and the rear end of the impeller 22 to perform global cleaning on the entire impeller 22:

[0083] ① As Figure 4 shown, the cleaning medium supply member 3 is in the initial position, and the steam ejected from the outlet 302 of the penetrating portion 30 aims at the rear edge of the blade 221 and sprays;

[0084] ② As Figure 5 shown, as the cleaning medium supply member 3 further rotates, the position aimed at by the outlet 302 of the penetrating portion 30 moves forward, and the spraying area of the steam slowly moves forward;

[0085] ③ As Figure 6 shown, when the spraying area reaches the front end of the blade 221, the driving device 4 changes the rotation direction to start secondary flushing of the blade 221;

[0086] ④ Until the spraying area returns to the rear end of the blade 221, the driving device 4 changes the rotation direction again and repeats the above movement;

[0087] After the cleaning is completed and in the non-working state, the cleaning medium supply member 3 rotates outward to completely disengage from the relief hole 211, so that the outlet 302 of the penetrating portion 30 exits the volute 21, trying to avoid the risk of blockage of the outlet 302 of the penetrating portion 30 caused by being placed in the volute 21 for a long time. However, since the relief hole 211 is no longer blocked, the airflow in the volute 21 can still easily rush through the relief hole 21 towards the outlet 302 of the penetrating portion 30, causing its blockage;

[0088] (2) After the global cleaning is completed, the impeller 22 starts to rotate at high speed to throw off the grease and cleaning liquid from the impeller 22. Then, the grease test sensor is started to detect the grease on the blades 221, and the detection results are recorded in the database;

[0089] After the global cleaning, the centrifugal force of high-speed throwing-off is used to throw off the loosened oil stains and cleaning water by flushing, reducing the burden of precise cleaning. The liquid oil-water mixture covering the oil stains actually weakens the cleaning power of the high-pressure jet;

[0090] (3) Start the regional cleaning. During the regional cleaning, the cleaning medium supply member 3 actively positions to the point with oil stains and starts the fixed-point cleaning until it is completely cleaned. For multiple oil stain points, sort the areas and give priority to cleaning the areas with large oil stain areas;

[0091] Since the current self-cleaning technology requires users to add water by themselves, if too much water is added each time, it will form a burden and risk for users to add water, store waste water, and pour waste water. Moreover, generally, the impeller 22 cannot be completely cleaned through a single complete cleaning. Regional cleaning can give priority to cleaning the positions with more oil adhesion points, thereby effectively improving the cleaning rate.

[0092] As Figure 9 shown, the above range hood performs self-cleaning prompts through the following method before self-cleaning:

[0093] S001. Start, read the time T1 from the last cleaning to now, read the cumulative usage time T2 from the last cleaning to now, and enter S002;

[0094] S002. Judge whether the values of T1 and T2 meet: T1 > D and T2 > H. If so, enter S003. If not, enter S005;

[0095] S003. Light up the self-cleaning prompt and enter S004;

[0096] S004. Judge whether the user starts self-cleaning. If so, enter S005. If not, return to S003;

[0097] S005. Turn off the self-cleaning prompt and end;

[0098] Among them, D is the maximum allowable cleaning interval time under normal conditions. Grease is easily removed when it just adheres to the surface of the impeller. As time goes by, the adhered grease will gradually oxidize, and it is efficient to clean the grease before it oxidizes. Therefore, the value of D is preferably 1 to 180 days, and the best is 90 days, at this time the grease oxidation rate is low;

[0099] H is the maximum allowable cumulative usage time under normal conditions. For some users who use less frequently, this scheme defines the cumulative time duration from the last cleaning to the present. For users who use less frequently, there is no need to clean frequently. The value of H is preferably 1 to 180 h, and the best is 60 h.

[0100] The control method for the self-cleaning operation of the above-mentioned range hood includes the following steps:

[0101] Step 1: Spray the cleaning medium from the moving cleaning medium supply member 3 onto the rotating impeller 22, so that the spraying area of the cleaning medium reciprocates axially between the front end and the rear end of the impeller 22 to perform global cleaning on the entire impeller 22;

[0102] Specifically, as Figure 10 shown, the above step 1 is realized by the following method:

[0103] S101: Start, the initial value of θ is 0, the initial value of t is 0, start the driving member 23 to drive the impeller 22 to rotate, and enter S102;

[0104] S102: Start the driving device 4 to drive the cleaning medium supply member 3 to rotate forward, ω = f(θ), record ta, and enter S103;

[0105] S103: Collect the values of t and θ, and enter S104;

[0106] S104: Judge whether the value of θ satisfies: θ≥θmax, if so, enter S106, if not, enter S105;

[0107] S105: Judge whether the value of t satisfies: t - ta≥Δt, if so, return to S102, if not, return to S103;

[0108] S106: Start the driving device 4 to drive the cleaning medium supply member 3 to rotate backward, ω = f(t), record tb, and enter S107;

[0109] S107: Collect the values of t and θ, and enter S108;

[0110] S108: Judge whether the value of θ satisfies: θ≤0, if so, enter S110, if not, enter S109;

[0111] S109. Determine whether the t value satisfies: t - tb ≥ Δt. If so, return to S106; if not, return to S107;

[0112] S110. Determine whether the t value satisfies: t ≥ t0. If so, proceed to S111; if not, return to S102;

[0113] S111. Turn off the driving member 23 and the driving device 4, and end;

[0114] Wherein, θmax is the rotation angle when the injection area of the cleaning medium supply member 3 is located at the foremost end of the impeller 22, and its value is preferably 30 - 75°;

[0115] Δt is the time interval between two adjacent speed changes of the driving device 4. The smaller this value is, the more it can ensure that the reciprocating movement along the axial direction between one point A of the injection area where the cleaning medium shoots towards the impeller 22 and the two axial ends of the impeller 22 is a uniform motion. This value is preferably 1 - 100 ms;

[0116] t0 is the total global cleaning duration, and its value is preferably 10 - 20 min;

[0117] Of course, Δθ can also be used as the rotation angle interval between two adjacent speed changes of the driving device 4, and this value is preferably 0.1 - 1°;

[0118] In addition, a stepping motor can also be used as the driving device 4. In this way, as Figure 11 shown, the above step one can be realized by the following method:

[0119] S101. Start. The initial value of θ is 0, the initial value of n is 0. Start the driving member 23 to drive the impeller 22 to rotate, and proceed to S102;

[0120] S102. Start the driving device 4 to drive the cleaning medium supply member 3 to rotate forward, ω = f(θ), record na, and proceed to S103;

[0121] S103. Collect the n and θ values, and proceed to S104;

[0122] S104. Determine whether the θ value satisfies: θ ≥ θmax. If so, proceed to S106; if not, proceed to S105;

[0123] S105. Determine whether the n value satisfies: n - na ≥ Δn. If so, return to S102; if not, return to S103;

[0124] S106. Start the driving device 4 to drive the cleaning medium supply member 3 to rotate backward, ω = f(t), record nb, and proceed to S107;

[0125] S107. Collect the n and θ values, and proceed to S108;

[0126] S108. Determine whether the θ value satisfies: θ ≤ 0. If so, proceed to S110; if not, proceed to S109;

[0127] S109. Determine whether the n value satisfies: n - nb ≥ Δn. If so, return to S106; if not, return to S107;

[0128] S110. Determine whether the t value satisfies: t ≥ t0. If so, proceed to S111; if not, return to S102;

[0129] S111. Turn off the driving member 23 and the driving device 4, and end;

[0130] Wherein, n is the number of steps of the stepper motor. Since the step angle of the stepper motor = 360° / (number of rotor teeth * n), therefore, when n is determined, the value of θ can be calculated;

[0131] Δn is the step interval between two adjacent speed changes of the stepper motor, and this value is preferably 1 - 200.

[0132] Step Two: Generate centrifugal force by rotating the impeller 22, thereby removing the cleaning medium and grease on the surface of the impeller 22;

[0133] Specifically, the above Step Two is implemented by the following method: Start the driving member 23, and set the rotational speed at 1500 - 3000 r / min for dehydration and deoiling for 0.1 - 10 min, and then turn off the driving member 23;

[0134] Step Three: Detect the amount of oil stain at each position along the axial direction between the two end parts of the impeller 22 in the axial direction by rotating the sensor 8, and collect the oil-stained area of the impeller 22;

[0135] Specifically, as Figure 12 shown, the above Step Three is implemented by the following method:

[0136] S301. Start. The initial value of θ is 0, the initial value of t is 0, the initial value of tc is 0, the initial value of n is 1, start the sensor 8, and proceed to S302;

[0137] S302. Start the driving device 4 to drive the cleaning medium supply member 3 to rotate forward, ω = f(θ), record ta, and proceed to S303;

[0138] S303. Determine whether the t value satisfies: t - tc ≥ Δt'. If so, proceed to S304; if not, proceed to S307;

[0139] S304. Collect Record tc, and proceed to S305;

[0140] S305. Determine whether the value satisfies: If yes, go to S306; if no, go to S307;

[0141] S306. Record θn, let n = n + 1, and go to S307;

[0142] S307. Collect the values of t and θ, and go to S308;

[0143] S308. Determine whether the value of θ satisfies: θ ≥ θmax. If yes, go to S3010; if no, go to S309;

[0144] S309. Determine whether the value of t satisfies: t - ta ≥ Δt. If yes, return to S302; if no, return to S303;

[0145] S3010. Turn off the drive device 4 and the sensor 8, and end;

[0146] Wherein, θmax is the rotation angle when the injection area of the cleaning medium supply member 3 is located at the forefront of the impeller 22, and its value is preferably 30 - 75°;

[0147] Δt is the time interval between two adjacent speed changes of the drive device 4. The smaller this value is, the more it can ensure that the reciprocating movement of the injection area of the cleaning medium hitting one of the points A on the impeller 22 along the axis between the two axial ends of the impeller 22 is a uniform motion, and this value is preferably 1 - 100 ms;

[0148] Δt’ is the time interval between two adjacent samplings of the sensor 8. The smaller this value is, the greater the sampling accuracy, and this value is preferably 1 - 100 ms;

[0149] is the maximum oil stain characterization value allowed in the normal state. In this embodiment, its value is preferably 20 - 100% (humidity);

[0150] Step Four: Spray the cleaning medium from the moving cleaning medium supply member 3 onto the rotating impeller 22, so that the injection area of the cleaning medium reciprocates axially between the front end and the rear end of the oil-stained area, and perform area cleaning on the oil-stained area.

[0151] Specifically, the above step 4 is implemented by the following method: first, the oily areas collected in step 3 are sorted by area size, and then the oily areas are cleaned in descending order of area size, that is, the cleaning medium supply member 3 is rotated to the corresponding rotation angle θ'n for regional cleaning. Since there is a stable angle between the sensor 8 and the cleaning medium supply member 3, it is necessary to use Δθ' to correct the step difference during data processing, that is, θ'n=θn+Δθ', Δθ' is the angle between the cleaning medium injection path of the cleaning medium supply member 3 and the medium ejection path detected by the sensor 8; as for how to sort the oily areas by area size, in this embodiment, the above-mentioned recorded θ1, θ2, ..., θn are analyzed to determine whether two consecutive oily points, three oily points, ... are found. Specifically, it is achieved by detecting whether the angles of two adjacent oily points are the rotation angles within one unit time, and whether the three consecutive oily points are the rotation angles within two unit times, and finally accurate cleaning is achieved in reverse order, because the later it is recorded in the database, the more consecutive it is.

[0152] Embodiment 2:

[0153] like Figure 13 FIG. 2 is a second preferred embodiment of the range hood of the present invention. The difference from the first embodiment is that:

[0154] In this embodiment, Figure 13 As shown, in the non-working state, the end face of the penetration portion 30 is opposite to the clearance hole 211, and the outlet 302 of the penetration portion 30 is located on the adjacent side wall of the end face. In this way, in the non-working state, the airflow in the volute 21 is no longer easy to rush to the outlet 302 of the penetration portion 30 through the clearance hole 21 to cause blockage.

[0155] Embodiment 3:

[0156] like Figure 14 and Figure 15 The third preferred embodiment of the range hood of the present invention is shown in FIG. The difference from the second embodiment is that:

[0157] In this embodiment, the cleaning medium supply member 3' is in a spiral shape, and the rear section is the penetrating portion 30'. The cleaning medium supply member 3' is drivingly connected to the power output end of the driving device 4 through the first transmission assembly 31'. The first transmission assembly 31' includes a first rack 311', a first gear 312' and an elastic limiting block 313'. Specifically, the first rack 311' is arranged on the first side of the cleaning medium supply member 3' along the extending direction of the cleaning medium supply member 3'; the first gear 312' is coaxially connected to the power output end of the driving device 4 and meshes with the first rack 311'; the elastic limiting block 313' is installed on the volute 21 and located on the second side of the cleaning medium supply member 3', so that the cleaning medium supply member 3' is clamped between the first gear 312' and the elastic limiting block 313'.

[0158] Start the driving device 4 to drive the first gear 312' to rotate. Since the first rack 311' meshes with the first gear 312', the first rack 311' drives the cleaning medium supply member 3' to make a spiral curve movement relative to the volute 21 accordingly.

[0159] The working principle of this embodiment is as follows:

[0160] (1) As shown in Figure 14 , in the non-working state, the outlet 302' of the penetrating portion 30' exits the volute 21 to avoid the risk of blockage of the outlet 302' of the penetrating portion 30" caused by being placed in the volute 21 for a long time;

[0161] (2) When cleaning is required, the driving device 4 drives the cleaning medium supply member 3' to make a spiral curve movement relative to the volute 21, so that the outlet 302' of the penetrating portion 30' extends into the volute 21 and faces the blade 221 of the impeller 22. As shown in Figure 15 , in the working state, by periodically changing the rotation direction of the driving device 4, the injection area where the cleaning medium ejected from the outlet 302' of the penetrating portion 30' shoots at the blade 221 can reciprocate between the two end portions in the axial direction of the impeller 22, realizing the cleaning of the impeller 22.

[0162] Embodiment 4:

[0163] As shown in Figure 16 and Figure 17 , this is the fourth preferred embodiment of the range hood of the present invention. The difference from Embodiment 2 is that:

[0164] In this embodiment, the relief hole 211 is formed in the end wall of the volute 21. The cleaning medium supply member 3" is an elastic strip-shaped pipeline, and the rear section is the passing portion 30". The cleaning medium supply member 3" is drivingly connected to the power output end of the driving device 4 through the second transmission assembly 31". The second transmission assembly 31" includes a second rack 311", a second gear 312" and a limit sleeve 313". Specifically, the number of the second racks 311" is at least two, which are sequentially sleeved on the cleaning medium supply member 3" along the extending direction of the cleaning medium supply member 3". The adjacent ends of the adjacent second racks 311" are hinged; the second gear 312" is coaxially connected to the power output end of the driving device 4 and can mesh with each second rack 311"; the limit sleeve 313" is installed on the volute 21, and the inside thereof has a bent channel 3131" for the cleaning medium supply member 3" and the second rack 311" to pass through.

[0165] Start the driving device 4 to drive the second gear 312" to rotate. Since the second rack 311" can mesh with each second gear 312", the second rack 311" drives the cleaning medium supply member 3' to move relative to the volute 21. During the movement, the outlet 302" of the passing portion 30" moves in a straight line, and the end of the passing portion 30" away from the outlet 302" moves along the bent channel 3131". Its movement trajectory is a non-linear shape, and the non-linear shape can be a curve, a broken line, etc., which can be a regular trajectory or an irregular trajectory, as long as it is ensured that it is not a straight-line movement.

[0166] The working principle of this embodiment is as follows:

[0167] (1) As Figure 16 shown, in the non-working state, the outlet 302" of the passing portion 30" exits the volute 21 to avoid the risk of blockage of the outlet 302" of the passing portion 30" caused by being placed in the volute 21 for a long time. Moreover, the cleaning medium supply member 3" is arranged along the bent channel 3131" under the limitation of the limit sleeve 313", reducing the occupied space;

[0168] (2) When cleaning is required, the driving device 4 drives the cleaning medium supply member 3" to move backward relative to the volute 21 so that the outlet 302" of the passing portion 30" extends into the volute 21 and faces the blade 221 of the impeller 22. As Figure 17 shown, in the working state, the cleaning medium supply member 3" extending into the volute 21 will recover to the long strip structure under its own elastic force. By periodically changing the rotation direction of the driving device 4, the spraying area where the cleaning medium ejected from the outlet 302" of the passing portion 30" shoots at the blade 221 can reciprocate between the two axial ends of the impeller 22, realizing the cleaning of the impeller 22; the cleaning medium supply member 3" exposed outside the volute 21 is arranged along the bent channel 3131" under the limitation of the limit sleeve 313", reducing the occupied space.

[0169] It should be noted that in the above-mentioned Embodiments 1 to 3 of the present application, the cleaning medium supply member 3 (3') is rotatable relative to the volute 21 of the blower 2, so that the injection area of the cleaning medium injected from the cleaning medium supply member 3 (3') towards the impeller 22 reciprocates between the two axial ends of the impeller 22, so as to achieve full-area cleaning of the entire impeller. However, when the cleaning medium supply member 3 (3') rotates relative to the volute 21, both the injection distance of the cleaning medium supply member 3 (3') (i.e., the length of the injection flow from the cleaning medium supply member 3 (3') to the impeller 22) and the injection angle (i.e., the angle between the injection flow from the cleaning medium supply member 3 (3') to the impeller 22 and the plane perpendicular to the central axis of the impeller 22) are constantly changing; at the same time, when the axial position of the cleaning medium supply member 3 (3') relative to the impeller 22 changes, the injection distance and the injection angle will also change accordingly. Since both the injection distance and the injection angle will affect the flushing force and thus the cleaning effect, the configuration of the positional relationship between the cleaning medium supply member 3 (3') and the impeller 22 of the present application is particularly important. That is to say, how to reasonably design the position of the cleaning medium supply member 3 (3') relative to the impeller 22 is the key to obtaining a better cleaning effect (i.e., taking into account better flushing force and injection angle).

[0170] Specifically, according to another aspect of the present application, as Figures 18 to 23 shown, a preferred embodiment of the present application provides an oil fume extractor 1A, which may include a housing 10A and a self-cleaning blower 20A assembled in the housing 10A for extracting oil fume. It can be understood that the oil fume extractor 1A of the present application may also but is not limited to include a water tank, a steam generator, a water receiving box, and / or a sensor to assist in completing the oil fume extraction function, which will not be elaborated herein.

[0171] More specifically, as Figures 19 to 23 shown, the self-cleaning blower 20A of the present application may include a blower main body 21A and a cleaning device 22A. The blower main body 21A may include a volute 211A and an impeller 212A rotatably disposed in the volute 211A. A plurality of blades 2120A are provided in the circumferential direction of the impeller 212A. The cleaning device 22A may include a cleaning medium supply member 221A rotatably disposed relative to the volute 211A. The rotation axis 220A of the cleaning medium supply member 221A is perpendicular to the central axis 210A of the impeller 212A, and the injection angle difference y between the cleaning medium supply member 221A when cleaning the two axial ends of the blade 2120A and the long-distance ratio x between the axial length of the blade 2120A and the equivalent axial distance satisfy the relationship: y ≤ -0.184x 2-2.6392x + 76.359; wherein the equivalent axis distance is the distance between the intersection point of the spray lines when the cleaning medium supply member 221A is at the axial two ends of the cleaning blade 2120A and the blade 2120A to be cleaned. It can be understood that the fan main body 21A mentioned in the present application further includes a driving member, such as a motor, for driving the impeller 212A to rotate around the central axis 210A; the rotation axis 220A mentioned in the present application refers to the straight line around which the cleaning medium supply member 221A rotates relative to the volute 211A; the spray line mentioned in the present application refers to the straight line where the spray flow formed by spraying the cleaning medium through the cleaning medium supply member 221A is located.

[0172] It should be noted that the perpendicularity mentioned in the present application is not limited to an angle of 90°. It can be considered that the angle between the rotation axis 220A and the central axis 210A within 90° ± 10° satisfies that the rotation axis 220A of the cleaning medium supply member 221A is perpendicular to the central axis 210A of the impeller 212A as mentioned in the present application. It can be understood that the unit of the spray angle difference y mentioned in the present application is degree, such as y ≤ 45°.

[0173] In addition, the axial two ends of the blade 2120A mentioned in the present application can but are not limited to be implemented as the two physical ends of the blade 2120A (i.e., to achieve the full - area cleaning of the blade); in other examples of the present application, the axial two ends of the blade 2120A mentioned in the present application can also be implemented as the axial two ends of the cleaning area on the blade 2120A (i.e., both full - area cleaning or partial cleaning of the blade can be achieved), and the present application will not elaborate on this.

[0174] It should be noted that a plurality of axially - extending blades 2120A are arranged at circumferential intervals on the impeller 212A, then the outer contour of the impeller 212A is defined by the outer edges of multiple blades 2120A; that is to say, as Figure 20 and Figure 22 shown, when the axial two ends of a certain blade 2120A are respectively cleaned by the cleaning medium supply member 221A, the angles between the spray flows formed by the cleaning medium supply member 221A spraying the cleaning medium and the plane perpendicular to the central axis 210A of the impeller 212A are a1 and a2 respectively, then the spray angle difference y mentioned in the present application = |a1 - a2|; the equivalent axis distance mentioned in the present application refers to the perpendicular distance S between the equivalent rotation axis of the cleaning medium supply member 221A and the blade 2120A to be cleaned; the axial length of the blade 2120A mentioned in the present application is denoted as H, then the long - distance ratio x mentioned in the present application = H / S.

[0175] It is understandable that the equivalent rotation axis of the cleaning medium supply member 221A of the present application refers to a straight line passing through the intersection point of the spray rays and parallel to the rotation axis 220A. In addition, as the cleaning medium supply member 221A rotates relative to the volute 211A, the spray area formed by the cleaning medium contacting the blade 2120A will axially move from one end of the blade 2120A to the other end. During this process, the angle between the spray flow formed by the cleaning medium supply member 221A spraying the cleaning medium and the central axis 210A of the impeller 212A first gradually decreases from a1 to 0°, and then gradually increases to a2.

[0176] After measurement, when the spray angle difference y and the long-distance ratio x of the self-cleaning fan 20A of the present application satisfy the relational expression y ≤ -0.1318x 2 +2.8652x + 29.647, the average spray angle of the cleaning medium supply member 221A when cleaning the entire blade 2120A is relatively small, so that the average component force of the washing force of the spray flow in the direction perpendicular to the blade 2120A is relatively large, which is beneficial to impeller cleaning. Especially compared with the case where the spray angle difference y is zero, when y = -0.184x 2 -2.6392x + 76.359, the average washing force of the cleaning medium supply member 221A when cleaning the entire blade 2120A decreases by less than 30%. It can still achieve a good cleaning effect while increasing the flexibility of the positional relationship configuration between the cleaning medium supply member 221A and the impeller 212A, avoiding interference with structures such as the housing 10A or the volute 211A, and facilitating assembly. It is understandable that the relational expression between the spray angle difference y and the long-distance ratio x mentioned in the present application is obtained by multi-point fitting as Figure 23 shown, where each point is the spray angle difference when the average impact force decreases by 30% at the corresponding long-distance ratio x. The present application will not elaborate on this.

[0177] Optionally, as Figure 22 shown, the spray angle difference y of the cleaning medium supply member 221A when cleaning the axial two ends of the blade 2120A is less than or equal to 45°, so as to facilitate simplifying the position design of the cleaning medium supply member 221A relative to the impeller 212A by quantifying the constraint condition of the spray angle difference y.

[0178] Limited by the cooperation relationship between the housing 10A and the fan main body 21A, the value of the long-distance ratio x of the self-cleaning fan 20A generally ranges from 1.03 to 4.80. Therefore, according to the above relational expression, it can be known that the spray angle difference y of the self-cleaning fan 20A is preferably less than 30° so as to adapt to most sizes of fans and can achieve a good flushing effect.

[0179] Preferably, as Figure 20As shown, the spraying angles of the cleaning medium supply member 221A at the two axial ends of the cleaning blade 2120A are equal. That is to say, the spraying angle difference y of the cleaning medium supply member 221A at the two axial ends of the cleaning blade 2120A is 0. At this time, the average flushing force of the cleaning medium supply member 221A when cleaning the entire impeller is the largest, and the flushing effect is the best.

[0180] It should be noted that in this application, the cleaning effect is evaluated by using the ratio of the amount of oil stain cleaned after cleaning to the weight increase of the oil stain before cleaning as the cleaning rate. It can be known from tests under the same conditions that when the vertical projection of the equivalent rotation axis of the cleaning medium supply member 221A of this application on the impeller 212A is at the axial end point of the impeller 212A, the spraying angle difference y > -0.184x 2 -2.6392x + 76.359. At this time, the weight increase of the oil stain is 12.37g, and the amount of oil stain cleaned is 6.78g. After calculation, the cleaning rate is 54.8%. When the vertical projection of the equivalent rotation axis of the cleaning medium supply member 221A of this application on the impeller 212A is at the 10% position of the axial length of the impeller 212A, the spraying angle difference y is close to -0.184x 2 -2.6392x + 76.359. At this time, the weight increase of the oil stain is 12.5g, and the amount of oil stain cleaned is 8.37g. After calculation, the cleaning rate is 67%. When the vertical projection of the equivalent rotation axis of the cleaning medium supply member 221A of this application on the impeller 212A is at the 42% position of the axial length of the impeller 212A, the spraying angle difference y is close to 0°. At this time, the weight increase of the oil stain is 12.66g, and the amount of oil stain cleaned is 9.26g. After calculation, the cleaning rate is 73.1%. For the existing steam cleaning scheme, the weight increase of the oil stain is 13.81g, and the amount of oil stain cleaned is 5.55g. After calculation, the cleaning rate is 40.2%. For the existing steam and water cleaning scheme, the weight increase of the oil stain is 13.78g, and the amount of oil stain cleaned is 4.85g. After calculation, the cleaning rate is 35.02%. In summary, compared with the existing cleaning schemes, the cleaning effect of the self-cleaning type fan 20A of this application is improved. Especially when the spraying angle difference y and the long-distance ratio x satisfy the relational expression y ≤ -0.184x 2 -2.6392x + 76.359, the cleaning effect is significantly improved, which is of great significance for the oil stain cleaning of the range hood.

[0181] According to the above embodiments of this application, as Figure 19 and Figure 21As shown, the cleaning medium supply member 221A includes a moving portion 2211A extending in the circumferential direction of the rotation axis 220A and a nozzle 2212A tilted outward from the first end 22111A of the moving portion 2211A, and the angle β between the spray line of the nozzle 2212A and the tangent line of the moving portion 2211A at the first end 22111A is greater than 0° and less than or equal to 90°. In this way, compared with the solution in which the nozzle 2212A extends in the circumferential direction or tangential direction of the moving portion 2211A, when the cleaning medium supply member 221A is rotated to clean the entire blade 2120A, the average distance between the nozzle 2212A and the blade 2120A in this embodiment of the present application is shorter, which helps to reduce the loss of flushing force.

[0182] For example, in the first example of the present application, Figure 19 and Figure 20 As shown, the angle β between the spray line of the nozzle 2212A and the tangent line of the moving part 2211A at the first end 22111A is equal to 90°, so that the spray direction of the nozzle 2212A is perpendicular to the tangent line direction of the moving part 2211A at the first end 22111A, thereby maximally shortening the average distance between the nozzle 2212A and the blade 2120A, so as to further reduce the loss of flushing force. It can be understood that in this example of the present application, the equivalent rotation axis of the cleaning medium supply member 221A coincides with the rotation axis 220A of the cleaning medium supply member 221A.

[0183] Preferably, the vertical projection position of the rotation axis 220A of the cleaning medium supply member 221A on the central axis 210A of the impeller 212A is equidistant from the axial ends of the impeller 212A to ensure that the spray angles of the cleaning medium supply member 221A at the axial ends of the cleaning blade 2120A are equal, thereby obtaining a better flushing effect.

[0184] Of course, in the second example of the present application, Figure 21 and Figure 22 As shown, the nozzle 2212A in the cleaning medium supply member 221A can also extend outwardly from the first end 22111A of the moving part 2211A in an inclined manner; for example, the angle between the spray direction of the nozzle 2212A and the tangent direction of the moving part 2211A at the first end 22111A can be equal to 45°, so as to reduce the angle between the moving part 2211A and the nozzle 2212A while shortening the spray distance, reduce the loss of water force at the corner, and improve the flushing effect. It can be understood that in this example of the present application, the equivalent rotation axis of the cleaning medium supply member 221A is parallel to the rotation axis 220A of the cleaning medium supply member 221A.

[0185] It is worth noting that Figure 19 andFigure 21 As shown, a relief hole 2110A is provided on the volute 211A of the fan main body 21A. The rotation axis 220A of the cleaning medium supply member 221A is located outside the volute 211A, and the moving part 2211A of the cleaning medium supply member 221A is rotated around the rotation axis 220A to drive the nozzle 2212A to enter and exit the volute 211A through the relief hole 2110A, thus forming a penetrating part. In this way, when it is necessary to clean the impeller 212A, the moving part 2211A of the cleaning medium supply member 221A is rotated around the rotation axis 220A to drive the nozzle 2212A to extend into the volute 211A through the relief hole 2110A and spray the cleaning medium onto the blades 2120A; and after the nozzle 2212A passes through the relief hole 2110A, it makes a swinging motion around the rotation axis 220A (that is, makes a reciprocating motion within a certain angle range around the rotation axis 220A), so that the spraying area reciprocates between the axial two ends of the impeller 212A, thereby realizing the full-range cleaning of the impeller 212A; and when it is not necessary to clean the impeller 212A, the moving part 2211A of the cleaning medium supply member 221A is rotated around the rotation axis 220A to drive the nozzle 2212A to exit the volute 211A through the relief hole 2110A, avoiding the nozzle 2212A being blocked by the oil stain in the volute 211A.

[0186] It can be understood that precisely because the nozzle 2212A in the cleaning medium supply member 221A is tilted outwards, when the rotation axis 220A of the cleaning medium supply member 221A is arranged outside the volute 211A, the nozzle 2212A starts to spray the cleaning medium only after being screwed into the volute 211A through the relief hole 2110A, which can ensure the full-range cleaning of the impeller 212A; when the nozzle extends in the circumferential direction, after the nozzle is screwed into the volute 211A, the angle between the spraying direction of the nozzle and the axis direction of the impeller is necessarily less than 90°, and gradually decreases. At this time, not only is the impact force loss large, but also the nozzle 2212A needs to spray the cleaning medium before being screwed into the volute 211A through the relief hole 2110A in order to realize the full-range cleaning of the impeller 212A. However, in order to prevent the oil fume from leaking out from the relief hole 2110A, a closing door is usually provided at the relief hole 2110A. Therefore, the nozzle cannot spray the cleaning medium onto the impeller 212A for cleaning before passing through the relief hole 2110A, resulting in the circumferentially extending nozzle being unable to clean a certain axial end of the impeller 212A, and thus unable to realize the full-range cleaning of the impeller 212A.

[0187] Optionally, as Figure 18 、 Figure 19 and Figure 21As shown, the cleaning device 22A further includes a driving mechanism 222A fixedly provided in the volute 211A and a rotating seat 223A drivably connected to the driving mechanism 222A. The rotating seat 223A includes a rotating shaft 2231A providing a rotation axis 220A and a connecting arm 2232A extending outward from the outer peripheral wall of the rotating shaft 2231A. The rotating shaft 2231 is coaxially connected to the power output end of the driving mechanism 222A, and the end of the connecting arm 2232A is fixedly connected to the moving part 2211A of the cleaning medium supply member 221A. In this way, the connecting arm 2232A can support the moving part 2211A and the nozzle 2212A away from the rotation axis 220A, so that the opening position of the relief hole 2110A can be away from the rotation axis 220A, which helps to ensure that the power output end of the driving mechanism 222A can be away from the relief hole 2110A, avoiding the driving mechanism 222A being contaminated by the oil stain leaking from the relief hole 2110A and helping to extend the service life of the driving mechanism 222A. It can be understood that in other examples of the present application, the driving mechanism 222A can also be fixedly provided in the housing 10A and still be able to drive the cleaning medium supply member 221A to swing outside the volute 211A; or, the cleaning medium supply member 221A of the present application can also be rotatably arranged in the housing 10A, which will not be elaborated herein.

[0188] Optionally, as Figure 19 and Figure 21 shown, the end of the connecting arm 2232A is fixedly connected to the second end 22112A of the moving part 2211A, so as to reserve a sufficient long distance between the nozzle 2212A and the connecting arm 2232A, so as to widen the swinging angle range of the nozzle 2212A in the case of opening a smaller relief hole 2110A and avoid structural interference between the connecting arm 2232A and the volute 211A.

[0189] Optionally, as Figure 19 and Figure 21 shown, the relief hole 2110A is located on the outer peripheral wall of the volute 211A adjacent to the air inlet position of the fan main body 21A, so as to be away from the middle plate position of the impeller 212A. It can be understood that according to the air flow distribution and oil stain distribution in the volute 211A, the oil stain at the middle plate position of the impeller 212A is the most, while the oil stain at the position on the outer peripheral wall of the volute 211A adjacent to the air inlet position of the fan main body 21A is smaller, which helps to reduce the influence of the oil stain on the opening of the relief hole 2110A.

[0190] Optionally, as Figure 19 and Figure 21As shown, the moving part 2211A has a hollow channel 22110A communicating with the nozzle 2212A. The hollow channel 22110A of the moving part 2211A is used to convey a cleaning medium to the nozzle 2212A, so that the nozzle 2212A can eject the cleaning medium to clean the impeller 212A. It can be understood that the second end 22112A of the moving part 2211A can be connected to a water tank or a steam generator through a hose, but is not limited thereto, so that the cleaning medium (such as a liquid medium or a gaseous medium) is supplied to the nozzle 2212A through the hollow channel 22110A. This application will not elaborate on this anymore.

[0191] Optionally, the moving part 2211A can be implemented as an arc-shaped rigid tube, so as to minimize the opening size of the relief hole 2110A while stably supporting the nozzle 2212A; for example, the moving part 2211A can be, but is not limited to, a hollow tube made of a rigid material such as plastic, metal, or polymer material.

[0192] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered to be within the scope described in this specification.

[0193] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. Self-cleaning fan, characterized in that, include: A fan body, the fan body comprising a volute and an impeller rotatably disposed in the volute, wherein a plurality of blades are disposed in a circumferential direction of the impeller; and Cleaning device, the cleaning device includes a cleaning medium supply member rotatably provided relative to the volute, the rotation axis of the cleaning medium supply member is perpendicular to the central axis of the impeller, and the spray angle difference y between the cleaning medium supply member when cleaning the axial two ends of the blade and the long-distance ratio x between the axial length of the blade to be cleaned and the equivalent axis distance satisfy the relationship: y ≤ -0.184x 2 -2.6392x + 76.359; wherein the equivalent axis distance is the distance between the intersection point of the spray lines of the cleaning medium supply member when cleaning the axial two ends of the blade and the blade to be cleaned.

2. The self-cleaning fan according to claim 1, characterized in that, The spray angle difference y of the cleaning medium supply member when cleaning the axial ends of the blade is less than or equal to 45°.

3. The self-cleaning fan according to claim 1, wherein, The cleaning medium supply member has equal spray angles when cleaning both axial ends of the blade.

4. The self-cleaning fan according to any one of claims 1 to 3, characterized in that, The cleaning medium supply member includes a moving part extending circumferentially along the rotation axis and a nozzle tilted outward from a first end of the moving part, and an angle between a spray line of the nozzle and a tangent line of the first end of the moving part is greater than 0° and less than or equal to 90°.

5. The self-cleaning fan according to claim 4, wherein The included angle between the spray line of the nozzle and the tangent line of the first end of the moving part is equal to 90°.

6. The self-cleaning fan according to claim 5, characterized in that, The vertical projection position of the rotation axis of the cleaning medium supply member on the central axis of the impeller is equidistant from the axial ends of the impeller.

7. The self-cleaning fan according to claim 4, characterized in that, The volute of the fan body is provided with a clearance hole, the rotation axis of the cleaning medium supply member is located outside the volute, and the moving part is rotated around the rotation axis to drive the nozzle to enter and exit the volute through the clearance hole.

8. The self-cleaning fan according to claim 7, wherein The cleaning device further includes a driving mechanism fixed to the volute and a rotating seat drivably connected to the driving mechanism, the rotating seat includes a rotating shaft providing the rotation axis and a connecting arm extending outward from the outer peripheral wall of the rotating shaft, the rotating shaft is coaxially connected to the power output end of the driving mechanism, and the end of the connecting arm is fixedly connected to the second end of the moving part of the cleaning medium supply member.

9. The self-cleaning fan according to claim 8, wherein, The clearance hole is located on the outer peripheral wall of the volute and adjacent to the air inlet of the fan body.

10. The self-cleaning fan according to claim 4, wherein, The moving part has a hollow channel connected to the nozzle, and the hollow channel of the moving part is used to transport the cleaning medium to the nozzle.

11. Range hood, characterized in that, include: case; and The self-cleaning fan according to any one of claims 1 to 10, wherein the fan body of the self-cleaning fan is arranged inside the casing.

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