Self-cleaning fan, range hood and self-cleaning method

Abstract

The present invention relates to a self-cleaning fan, a range hood, and a self-cleaning method, which can achieve full-area cleaning of the impeller and obtain a good cleaning effect. The self-cleaning fan includes a fan body and a cleaning device. The fan body includes a volute and an impeller rotatably arranged in the volute. The cleaning device includes a cleaning medium supply member rotatably arranged relative to the volute, which is used to spray a cleaning medium to the impeller for self-cleaning. When the self-cleaning fan performs self-cleaning, the angular velocity ω of the cleaning medium supply member relative to the volute is equal to 2πC times the angular velocity n of the impeller relative to the volute, where 1 / 90≤C≤1 / 1500.

Description

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on October 28, 2022, with application number 202222901025.1 and application name “Self-cleaning fan and range hood”, the entire contents of which are incorporated by reference into this application. Technical Field

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

[0003] With the continuous advancement of range hood self-cleaning technology, steam cleaning or water cleaning has been widely used in the field of range hood self-cleaning. The basic principle is that the steam generator generates steam or the water pump pumps water, and the steam or water is transported to the nozzle at the end of the nozzle. The steam or water is quickly ejected from the nozzle to flush the impeller and volute for cleaning.

[0004] Currently, nozzles are generally provided with fixed holes, usually more than three in number. However, this cleaning method has the following disadvantages: First, during cleaning, steam or water is ejected from fixed nozzles. Since there are a limited number of nozzles, the flushing force at the intervals between the nozzles is very weak, resulting in poor cleaning effect; Second, due to the large number of holes and the fixed power of the steam generator or pump, the steam pressure or water pressure coming out of the nozzles is relatively low and unstable, resulting in poor cleaning effect.

[0005] In order to increase the flushing force, improve the cleaning effect and achieve comprehensive cleaning, the applicant's prior application, the invention patent with application number CN201711480573.9 (publication number CN109990332A) "A cleaning device for the fan system of a range hood" and the invention patent with patent application number CN201920819655.X (publication number CN210197396U) "A range hood with self-cleaning function" both proposed a design idea of ​​comprehensively cleaning the impeller by moving the cleaning medium supply part to improve the cleaning effect.

[0006] However, the first solution mentioned above has to open a long strip-shaped clearance hole on the volute extending along the moving direction of the cleaning medium supply part, which requires a large modification to the original structure of the fan and is likely to affect the performance of the fan. If an additional shielding part is provided, there is a problem that the sticky grease will stick to the shielding part after long-term use, causing it to be unable to open or close tightly; although the second solution mentioned above does not require a larger clearance hole, the horizontal feed type cleaning medium supply part therein needs to occupy a large amount of end side space, and the size of the current existing products can hardly support such a large space. Summary of the Invention

[0007] One advantage of the present invention is that it provides a self-cleaning fan, a range hood and a self-cleaning method, which can achieve full-area cleaning of the impeller while using less cleaning medium and avoiding waste of water resources.

[0008] Another advantage of the present invention is that it provides a self-cleaning fan, range hood, and self-cleaning method that achieves the aforementioned objectives without requiring the use of expensive materials or complex structures. Thus, the present invention successfully and effectively provides a solution that not only provides a simple self-cleaning fan, range hood, and self-cleaning method, but also increases the practicality and reliability of the self-cleaning fan, range hood, and self-cleaning method.

[0009] In order to achieve at least one of the above advantages or other advantages and purposes of the present invention, the present invention provides a self-cleaning blower, comprising:

[0010] a fan body, the fan body including a volute and an impeller rotatably disposed in the volute; and

[0011] A cleaning device, the cleaning device including a cleaning medium supply member rotatably arranged relative to the volute, for spraying cleaning medium onto the impeller for self-cleaning. When the self-cleaning blower performs self-cleaning, the angular velocity ω of the cleaning medium supply member relative to the volute is equal to 2πC times the rotational speed n of the impeller relative to the volute, where 1 / 1500≤C≤1 / 90.

[0012] According to one embodiment of the present application, when the self-cleaning blower performs self-cleaning, the impeller and the cleaning medium supply member both rotate at a uniform speed relative to the volute, wherein the angular velocity ω of the cleaning medium supply member and the rotational speed n of the impeller satisfy the relationship: ω=2πC2*n, where 1 / 600≤C3≤1 / 90.

[0013] According to one embodiment of the present application, when the self-cleaning blower performs self-cleaning, the impeller rotates at a constant speed relative to the volute, and the cleaning medium supply member rotates at a variable speed relative to the volute, wherein the maximum angular velocity ω of the cleaning medium supply member is max The impeller speed n satisfies the relationship: ω max =2πC3*n, where 1 / 500≤C4≤1 / 400.

[0014] According to one embodiment of the present application, the minimum angular velocity ω of the cleaning medium supply member is min The impeller speed n satisfies the relationship: ω min =2πC4*n, where 1 / 1000≤C5≤1 / 800.

[0015] According to one embodiment of the present application, the angular velocity ω of the cleaning medium supply member at the cleaning time i is i The relationship between the impeller speed n and ω is: i =(nPcos 2 θ) / h; wherein: P is the cleaning coefficient; θ is the rotation angle of the cleaning medium supply member; h is the vertical spray distance between the rotation axis of the cleaning medium supply member and the blade being cleaned.

[0016] According to one embodiment of the present application, when the self-cleaning blower performs self-cleaning, the cleaning medium supply member rotates at a constant speed relative to the volute, and the impeller rotates at a variable speed relative to the volute, wherein the angular velocity ω of the cleaning medium supply member relative to the volute is equal to the maximum speed n of the impeller. max Satisfies the relationship: ω=2πC5*n max , where 1 / 500≤C5≤1 / 400.

[0017] According to one embodiment of the present application, the angular velocity ω of the cleaning medium supply member is related to the minimum rotation speed n of the impeller. min Satisfies the relationship: ω=2πC6*n min , where 1 / 75≤C6≤1 / 60.

[0018] According to one embodiment of the present application, the speed n of the impeller at the cleaning time i is i The relationship between the angular velocity ω of the cleaning medium supply member and the angular velocity ω of the cleaning medium supply member is: i =(ωr 2 ) / (hP); wherein: P is the cleaning coefficient; r and h are the oblique spray distance and the vertical spray distance between the rotation axis of the cleaning medium supply member and the blade to be cleaned, respectively.

[0019] According to one embodiment of the present application, when the self-cleaning blower performs self-cleaning, the impeller and the cleaning medium supply member rotate at variable speeds relative to the volute, wherein the angular velocity ω of the cleaning medium supply member at the cleaning time i is i The speed n of the impeller at the cleaning moment i i The relationship is satisfied: 1 / 1200≤C7≤1 / 90.

[0020] According to one embodiment of the present application, the rotational speed of the impeller relative to the volute is greater than or equal to 30 rpm and less than or equal to 200 rpm.

[0021] According to another aspect of the present application, the present application further provides a self-cleaning method, comprising the steps of:

[0022] driving the impeller to rotate relative to the volute; and

[0023] The cleaning medium supply member is driven to rotate relative to the volute to spray the cleaning medium to the impeller, wherein the angular velocity ω of the cleaning medium supply member relative to the volute is equal to 2πC times the rotation speed n of the impeller relative to the volute, wherein 1 / 1500≤C≤1 / 90.

[0024] According to another aspect of the present application, the present application further provides a self-cleaning method, comprising the steps of:

[0025] Rotating the impeller at a constant speed relative to the volute; and

[0026] The cleaning medium supply member rotates at a variable speed relative to the volute to spray the cleaning medium to the impeller, wherein the angular velocity ω of the cleaning medium supply member at the cleaning time i is i The relationship between the impeller speed n is: i =(nPcos 2 θ) / h; wherein: P is the cleaning coefficient; θ is the rotation angle of the cleaning medium supply member; h is the vertical spray distance between the rotation axis of the cleaning medium supply member and the blade being cleaned.

[0027] According to another aspect of the present application, the present application further provides a self-cleaning method, comprising the steps of:

[0028] rotating the impeller at a variable speed relative to the volute; and

[0029] The cleaning medium supply member rotates at a constant speed relative to the volute to spray the cleaning medium onto the impeller, wherein the impeller has a rotation speed n at the cleaning time i. i The relationship between the angular velocity ω of the cleaning medium supply member and the cleaning medium supply member is: i =(ωr 2 ) / (hP); wherein: P is the cleaning coefficient; r and h are the oblique spray distance and vertical spray distance between the rotation axis of the cleaning medium supply member and the blade to be cleaned, respectively.

[0030] According to another aspect of the present application, the present application further provides a range hood, comprising:

[0031] housing; and

[0032] In any of the above-mentioned self-cleaning fans, the fan body of the self-cleaning fan is arranged inside the casing.

[0033] To summarize, the present application coordinates the speed (including angular velocity and rotational speed) relationship between the cleaning medium supply member and the impeller so that there is neither gap nor excessive overlap between adjacent cleaning areas on the blades, so as to achieve full-area cleaning of the impeller while using less cleaning medium and avoiding waste of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic structural diagram of a range hood according to a preferred embodiment of the present invention;

[0035] Figure 2 Shown Figure 1 AA cross-sectional view of a mid-range hood;

[0036] Figure 3 A schematic diagram of the cleaning process of the self-cleaning fan in the range hood according to the preferred embodiment of the present invention is shown;

[0037] Figure 4 A schematic diagram of the cleaning principle of the self-cleaning fan according to the preferred embodiment of the present invention is shown;

[0038] Figure 5 A first example of cleaning the self-cleaning blower according to the preferred embodiment of the present invention is shown;

[0039] Figure 6 A second example of cleaning the self-cleaning fan according to the preferred embodiment of the present invention is shown;

[0040] Figure 7 A schematic flow chart of a self-cleaning method according to a first embodiment of the present invention;

[0041] Figure 8 A schematic flow chart of a self-cleaning method according to a second embodiment of the present invention;

[0042] Figure 9 FIG. 4 is a flow chart of a self-cleaning method according to a third embodiment of the present invention.

[0043] Explanation of the main component symbols: 1A, range hood; 10A, casing; 20A, self-cleaning fan; 21A, fan body; 211A, volute; 2110A, give way hole; 212A, impeller; 210A, center axis; 2120A, blade; 22A, cleaning device; 2201A, impact area; 2202A, splashing area; 221A, cleaning medium supply part; 2211A, moving part; 22111A, first end; 22112A, second end; 2212A, nozzle; 222A, driving mechanism; 223A, rotating seat; 2231A, rotating shaft; 2232A, connecting arm.

[0044] The above description of the main component symbols is combined with the accompanying drawings and specific embodiments to further illustrate the present invention in detail. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component. When a component is considered to be "fixed to" another component, it may be directly fixed to the other component or there may be a central component.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0048] It is worth noting that in Examples 1 to 3 of the Chinese patent application with application number 202222901025.1 and application name “Self-cleaning fan and range hood,” the cleaning medium supply member and the impeller are both rotated relative to the fan's volute, so that the cleaning area formed at the impeller by the cleaning medium sprayed by the self-cleaning medium supply member moves between the axial ends of the impeller, thereby achieving cleaning of the entire impeller. However, on the one hand, if the impeller rotates too fast, the cleaning medium sprayed by the cleaning medium supply member will be blocked by the outer edge of the blade and cannot be sprayed to the side of the blade to be cleaned; if the impeller rotates too slowly, it will take a long time to clean all the blades, and the cleaning efficiency will be seriously reduced. On the other hand, if the rotation speed of the cleaning medium supply part is too fast, the axial movement speed of the cleaning area formed at the impeller will be too fast, resulting in gaps between adjacent cleaning areas on each blade and inability to achieve full-area cleaning; if the rotation speed of the cleaning medium supply part is too slow, the axial movement speed of the cleaning area formed at the impeller will be too slow, resulting in serious overlap between adjacent cleaning areas on each blade and consumption of a large amount of cleaning medium, resulting in waste of water resources.

[0049] Therefore, in order to achieve better cleaning effects while saving water resources, the design of the rotational speed or angular velocity relationship between the cleaning medium supply component and the impeller of this application is particularly important. That is to say, how to design the speed (including angular velocity and rotational speed) relationship between the cleaning medium supply component and the impeller is the key to obtaining better cleaning effects using limited cleaning media.

[0050] Specifically, according to another aspect of the present application, Figures 1 to 6 As shown, a preferred embodiment of the present application provides a range hood 1A, which may include a housing 10A and a self-cleaning fan 20A mounted on the housing 10A for extracting oil fumes. It is understood that the range hood 1A of the present application may also include, but is not limited to, a water tank, a steam generator, a water collection box, and / or sensors to assist in extracting oil fumes, which will not be further described herein.

[0051] More specifically, if Figures 2 to 6 As shown, the self-cleaning fan 20A of the present application may include a fan body 21A and a cleaning device 22A. The fan body 21A may include a volute 211A and an impeller 212A rotatably disposed in the volute 211A. The cleaning device 22A may include a cleaning medium supply member 221A rotatably disposed relative to the volute 211A, for spraying cleaning medium to the impeller 212A to enable the self-cleaning fan 20A to perform self-cleaning. At a certain time during the self-cleaning process of the self-cleaning fan 20A, the angular velocity ω of the cleaning medium supply member 221A relative to the volute 211A is equal to 2πC times the rotational speed n of the impeller 212A relative to the volute 211A, where 1 / 1500≤C≤1 / 90, so as to achieve a better cleaning effect while saving water resources. It is understood that the fan body 21A mentioned in this application also includes a driving member, such as a motor, for driving the impeller 212A to rotate about the central axis 210A. The axial direction mentioned in this application refers to the extension direction of the central axis 210A of the impeller 212A. The cleaning medium mentioned in this application can be water vapor, liquid water, or an aqueous solution, etc., and this application will not elaborate on this.

[0052] It is worth noting that a plurality of blades 2120A are provided around the impeller 212A. Since the cleaning medium sprayed through the cleaning medium supply member 221A usually forms a jet flow, it will splash or scatter outwards at the moment of impacting the surface of the blade 2120A, thereby increasing the washing area. Therefore, the cleaning medium sprayed through the cleaning medium supply member 221A will form a direct impact area 2201A and a splash area 2202A located around the impact area 2201A on the surface of the blade 2120A being cleaned. It is understandable that although the impact area 2201A and the splash area 2202A of the present application are described in the attached drawings, the impact area 2201A and the splash area 2202A of the present application are described in the attached drawings. Figure 3The areas 2201A and 2202A are shown as circular areas and annular areas, respectively, but this is for illustrative purposes only; for example, the impact area 2201A may also be an elliptical area, a strip area, or other shaped areas; accordingly, the sputtering area 2202A may also be an elliptical area or an area of ​​other shapes, and this application does not impose any restrictions on this.

[0053] Since the impact area 2201A mentioned in this application refers to the area where the cleaning medium sprayed through the cleaning medium supply part 221A directly hits the surface of the blade 2120A, it can achieve a better cleaning effect; the splashing area 2202A mentioned in this application refers to the annular area where the cleaning medium sprayed through the cleaning medium supply part 221A splashes outward when it directly hits the surface of the blade 2120A, which can still achieve a better cleaning effect; therefore, an impact area 2201A and the corresponding splashing area 2202A of this application are spliced ​​together into a continuous effective cleaning area.

[0054] Optionally, the rotation axis of the cleaning medium supply member 221A is eccentrically perpendicular to the central axis 210A of the impeller 212A to ensure that the jet stream formed by the cleaning medium sprayed through the cleaning medium supply member 221A can move along the axial direction of the impeller 212A. It will be understood that the rotation axis mentioned in this application refers to the straight line about which the cleaning medium supply member 221A rotates relative to the volute 211A.

[0055] It is worth noting that since the impeller 212A is also rotating relative to the volute 211A while the cleaning medium supply member 221A rotates relative to the volute 211A, the two axially adjacent impact areas 2201A on the blade 2102A refer to the two areas formed on the surface of the blade 2120A when the jet stream hits the impeller 212A at two moments before and after the impeller 212A rotates around the central axis 210A, and the center distance S between the two axially adjacent impact areas 2201A on the blade 2120A is equal to the distance the jet stream moves along the axial direction of the impeller 212A when the impeller 212A rotates around the central axis 210A. In this way, when the center spacing S is greater than the axial dimension S2 of the sputtering area 2202A, there will be a gap between the two axially adjacent sputtering areas 2202A on each blade 2120A, that is, the cleaning area on each blade 2120A is intermittent and discontinuous, and true full-area cleaning cannot be achieved; when the center spacing S is less than the axial dimension S1 of the impact area 2201A, there is partial overlap between the two axially adjacent impact areas 2201A on each blade 2120A, resulting in the same area on the blade 2120A being repeatedly impacted, which will not only consume a large amount of cleaning medium (such as water) and cause waste of resources, but also increase the cleaning time, resulting in low cleaning efficiency.

[0056] However, in the above embodiment of the present application, when the angular velocity ω of the cleaning medium supply member 221A and the rotational speed n of the impeller 212A satisfy the relationship ω≥2π*1 / 1500*n, the center distance S between the two axially adjacent impact areas 2201A on each blade 2120A will be greater than or equal to the axial size S1 of the impact area 2201A, so that the two axially adjacent impact areas 2201A on each blade 2120A will not overlap, which helps to save cleaning medium and avoid waste of water resources; and when the cleaning medium supply member 221A satisfies the relationship ω≥2π*1 / 1500*n, the center distance S between the two axially adjacent impact areas 2201A on each blade 2120A will be greater than or equal to the axial size S1 of the impact area 2201A. When the angular velocity ω of the feeder 221A and the rotational speed n of the impeller 212A satisfy the relationship ω≤2π*1 / 90*n, the center distance S between the two axially adjacent impact areas 2201A on each blade 2120A will be less than or equal to the axial dimension S2 of the sputtering area 2202A, so that the two axially adjacent sputtering areas 2202A on each blade 2120A will partially overlap, avoiding the existence of gaps between the sputtering areas 2202A, ensuring that the blade 2120A obtains a better cleaning effect and realizes true full-area cleaning.

[0057] In other words, at a certain time during the self-cleaning process of the self-cleaning fan 20A of the present application, the angular velocity ω of the cleaning medium supply part 221A relative to the volute 211A is equal to 2πC times the rotational speed n of the impeller 212A relative to the volute 211A, where 1 / 1500≤C≤1 / 90. Therefore, there will be no serious overlap between the two axially adjacent effective cleaning areas on each blade 2120A, thereby reducing the amount of cleaning medium used, and there will be no gaps, thereby achieving true full-area cleaning, thereby achieving better cleaning effects while using less cleaning medium.

[0058] For example, in the first example of the present application, when the self-cleaning blower 20A performs self-cleaning, the impeller 212A and the cleaning medium supply member 221A can rotate at a uniform speed relative to the volute 211A, wherein the angular velocity ω of the cleaning medium supply member 221A and the rotational speed n of the impeller 212A satisfy the relationship ω=2πC2*n, and 1 / 600≤C2≤1 / 90.

[0059] It is worth noting that since the cleaning medium supply member 221A rotates relative to the volute 211A so that the formed jet flow moves along the axial direction of the impeller 212A, when the impeller 212A and the cleaning medium supply member 221A both rotate at a uniform speed, as the cleaning medium supply member 221A rotates to different angles, the axial movement speed of the jet flow on the blade 2120A will be different, that is, the centers of the multiple impact areas 2201A on each blade 2120A will not be evenly distributed along the axial direction of the impeller 212A; that is, the center distance between axially adjacent impact areas 2201A on each blade 2120A will change with the change of the rotation angle.

[0060] However, in the first example of the present application, when ω=2π*1 / 600*n, the minimum value S of the center distance between two axially adjacent impact areas 2201A on each blade 2120A is min The maximum center distance S between two axially adjacent impact regions 2201A on each blade 2120A is greater than or equal to the axial size of the impact region 2201A to prevent any two adjacent impact regions 2201A from overlapping and avoid water waste. When ω = 2π*1 / 90*n, the maximum center distance S between two axially adjacent impact regions 2201A on each blade 2120A is max The axial dimension of the sputtering area 2202A is smaller than or equal to that of the sputtering area 2202A, so as to prevent a gap from existing between any two adjacent sputtering areas 2202A and ensure that full-area cleaning is truly achieved.

[0061] It is worth noting that, during the self-cleaning process of the self-cleaning fan 20A: the center distance S between the two axially adjacent impact areas 2201A on each blade 2120A will increase as the rotation speed of the cleaning medium supply part 221A increases and / or the rotation speed of the impeller 212A decreases, and accordingly, the center distance S between the two axially adjacent impact areas 2201A on each blade 2120A will decrease as the rotation speed of the cleaning medium supply part 221A decreases and / or the rotation speed of the impeller 212A increases; therefore, the present application can adjust the maximum and minimum values ​​of the center distance S by making at least one of the impeller 212A and the cleaning medium supply part 221A rotate at a variable speed relative to the volute 211A, so as to prevent the center distance S from being unable to achieve full-area cleaning due to the maximum value being too large, or causing water resource waste due to the minimum value being too small.

[0062] For example, in the second example of the present application, when the self-cleaning blower 20A performs self-cleaning, the impeller 212A rotates at a constant speed relative to the volute 211A, and the cleaning medium supply member 221A rotates at a variable speed relative to the volute 211A, wherein the maximum angular velocity ω of the cleaning medium supply member 221A is max The speed n of the impeller 212A satisfies the relationship ω max =2πC3*n, where 1 / 500≤C3≤1 / 400. Thus, when the cleaning medium supply member 221A is at the maximum angular velocity ω max When the center spacing S between the impact areas 2201A is formed, it can be greater than the axial dimension of the impact area 2201A and smaller than the axial dimension of the sputtering area 2202A, ensuring that the entire area is truly cleaned while avoiding water waste. It is understood that the maximum or minimum angular velocity and the subsequent maximum or minimum rotational speed mentioned in this application are the maximum or minimum values ​​of the instantaneous speed (including angular velocity and rotational speed) during the cleaning process.

[0063] Alternatively, the minimum angular velocity ω of the cleaning medium supply member 221A is min The speed n of the impeller 212A satisfies the relationship ω min =2πC4*n, where 1 / 1000≤C4≤1 / 800. Thus, when the cleaning medium supply member 221A is at the minimum angular velocity ω min When the center distance S between the impact areas 2201A is formed, it can still be larger than the axial size of the impact area 2201A and smaller than the axial size of the sputtering area 2202A, ensuring that full-area cleaning is truly achieved while avoiding water resource waste.

[0064] It is worth noting that when the impeller 212A rotates at a constant speed relative to the volute 211A, the present application can adjust the rotational speed of the cleaning medium supply member 221A so that the center-to-center distance S between two axially adjacent impact areas 2201A on each blade 2120A remains unchanged. That is, the centers of the multiple impact areas 2201A on each blade 2120A are evenly distributed along the axial direction of the impeller 212A, thereby achieving axial uniform distribution of the impact points of the cleaning medium sprayed through the cleaning medium supply member 221A on the surface of each blade 2120A, which helps to improve the consistency of the cleaning effect. It is understandable that the uniform distribution mentioned in this application is not absolute, but relative, that is, the uniform distribution can have certain fluctuations, as long as it is uniform within the allowable range of errors such as measurement error or mechanical error. This application will not elaborate on this.

[0065] According to the above embodiments of the present application, Figure 2 and Figure 3 As shown, the cleaning medium supply member 221A includes a moving portion 2211A extending circumferentially about the rotation axis O and a nozzle 2212A extending from a first end 22111A of the moving portion 2211A. Optionally, the nozzle 2212A tilts outward from the first end 22111A of the moving portion 2211A, meaning that the angle β between the jet from the nozzle 2212A and a tangent to the moving portion 2211A at the first end 22111A is greater than 0° and less than or equal to 90°. Thus, compared to an embodiment in which the nozzle 2212A extends circumferentially or tangentially to 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, helping to reduce loss of flushing force.

[0066] It is worth noting that when the impeller 212A rotates at a constant speed, in order to achieve a uniform distribution of impact points, the axial length that the nozzle 2212A can clean needs to remain consistent within the same time, that is, the axial speed of the jet moving on the surface of the cleaned blade 2120A needs to remain the same.

[0067] Specifically, take the example where the angle β between the jet of the nozzle 2212A and the tangent of the moving part 2211A at the first end 22111A is equal to 90°: Figure 4 and Figure 5 As shown, the vertical spray distance between the rotation axis O of the cleaning medium supply member 221A and the blade 2120A being cleaned is h; when the nozzle 2212A rotates around the rotation axis O at an angle θ (i.e., the rotation angle of the cleaning medium supply member 221A) from the vertical spraying of the jet stream to the blade 2120A being cleaned, so that the jet stream moves from point E to point F on the surface of the blade 2120A being cleaned, the oblique spray distance between the rotation axis O of the cleaning medium supply member 221A and the blade 2120A being cleaned is r, and the axial velocity of the jet stream on the surface of the blade 2120A being cleaned is V0. At this time, as shown in FIG. Figure 4 As shown, by decomposing the axial velocity V0, the radial velocity V of the jet on the surface of the blade 2120A being cleaned can be obtained. x and tangential velocity V y It is understood that this application Figure 5 The point O shown refers to the actual position of the rotation axis of the cleaning medium supply member 221A; point E refers to the vertical projection position of the rotation axis of the cleaning medium supply member 221A on the surface of the blade 2120A being cleaned; point F refers to the injection projection position of the rotation axis of the cleaning medium supply member 221A on the surface of the blade 2120A being cleaned (that is, the position projected along the injection direction); then h = OE; r = OF; θ = ∠FOE.

[0068] More specifically, if Figure 4 As shown, due to the tangential velocity V of the jet on the surface of the cleaned blade 2120A y =rω i , where r is the oblique spray distance between the rotation axis O and the blade 2120A being cleaned, ω i is the angular velocity of the nozzle 2212A rotating around the rotation axis O at the cleaning time i; therefore, cosθ=h / r; cos∠V y FV0=V y / V0=(rω i ) / V0.

[0069] Furthermore, due to ∠V y FV0=θ, so ω i =(V0cosθ) / r, and then ω i =(V0cos 2 θ) / h.

[0070] Furthermore, let n represent the rotation speed of the impeller 212A, and the time for the impeller 212A to rotate one circle, that is, the rotation period T of the impeller 212A = 1 / n. In order to achieve a uniform distribution of the impact points, the rotation period T of the impeller 212A needs to satisfy the following: T = S / V0, where S is the center distance between two axially adjacent impact areas 2201A on each blade 2120A, that is, the axial displacement of the jet on the surface of the cleaned blade 2120A when the impeller 212A rotates one circle. In this case, T = 1 / n = S / V0, that is, V0 = nS. It can be understood that since the rotation speed n of the impeller 212A is constant, in order to achieve a uniform distribution of the impact points (that is, S remains unchanged), the axial velocity V0 of the jet on the surface of the cleaned blade 2120A is also constant.

[0071] So, substitute V0=nS into the above formula ω i =(V0cos 2 θ) / h can be obtained: ω i =(nScos 2 In other words, in order to achieve a uniform distribution of the impact points, the angular velocity ω of the cleaning medium supply member 221A at the cleaning time i in this example of the present application is i The relationship between the speed n of the impeller 212A and the speed n is: i =(nScos 2 θ) / h; where: S is the center distance between two axially adjacent impact areas 2201A on each blade 2120A; θ is the rotation angle of the cleaning medium supply member 221A (ie, the nozzle 2212A).

[0072] It is easy to know from the above formula that: when the impeller 212A rotates at a constant speed (i.e., the speed n of the impeller 212A remains unchanged), as the rotation angle θ (e.g. Figure 5 As shown in FIG1<θ2<θ3), the angular velocity ω of the cleaning medium supply member 221A increases. i gradually decreases (i.e., the cleaning medium supply member 221A rotates at a reduced speed), so that the distances that the jet flow moves axially on the blade 2120A are equal within the same time t (e.g., Figure 5 As shown, M1=M2=M3), thereby achieving uniform distribution of impact points, which is convenient for saving water resources while improving cleaning efficiency.

[0073] Optionally, the angular velocity ω of the cleaning medium supply member 221A at the cleaning time i of the present application is i The relationship between the speed n of the impeller 212A and the speed n of the impeller 212A can be: i =(nPcos 2θ) / h; where P is the cleaning coefficient; θ is the rotation angle of the cleaning medium supply member 221A (i.e., the nozzle 2212A); and h is the vertical spray distance between the rotation axis of the cleaning medium supply member 221A and the blade 2120A being cleaned. It will be understood that the cleaning coefficient P referred to herein is determined by the center-to-center spacing S between two axially adjacent impact areas 2201A on each blade 2120A.

[0074] For example, in the third example of the present application, when the self-cleaning blower 20A performs self-cleaning, the impeller 212A rotates at a variable speed relative to the volute 211A, and the cleaning medium supply member 221A rotates at a uniform speed relative to the volute 211A, wherein the angular velocity ω of the cleaning medium supply member 221A is equal to the maximum rotation speed n of the impeller 212A. max Satisfying the relationship ω=2πC5*n max , where 1 / 500≤C5≤1 / 400. Thus, when the impeller 212A is at the maximum speed n max When the center distance S between the impact areas 2201A is formed, it can be larger than the axial size of the impact area 2201A and smaller than the axial size of the sputtering area 2202A, ensuring that full-area cleaning is truly achieved while avoiding water resource waste.

[0075] Alternatively, the angular velocity ω of the cleaning medium supply member 221A and the minimum rotation speed n of the impeller 212A are min Satisfying the relationship ω=2πC6*n min , where 1 / 75≤C6≤1 / 60. Thus, when the impeller 212A is at the minimum speed n min When the center distance S between the impact areas 2201A is formed, it can still be larger than the axial size of the impact area 2201A and smaller than the axial size of the sputtering area 2202A, ensuring that full-area cleaning is truly achieved while avoiding water resource waste.

[0076] It is worth noting that when the self-cleaning blower 20A is performing self-cleaning, the impeller 212A rotates at a variable speed relative to the volute 211A, and the cleaning medium supply member 221A rotates at a constant speed relative to the volute 211A, which can also ensure that all impact areas 2201A on each blade 2120A are evenly distributed along the axial direction of the impeller 212A. It is understandable that when the cleaning medium supply member 221A rotates at a constant speed, the axial length that the nozzle 2212A can clean in the same time is variable, that is, the axial length S that the jet travels on the surface of the blade 2120A being cleaned is equal to the length of the nozzle 2212A. i is constantly changing; if you want to achieve a uniform distribution of the impact points, you need to ensure that the axial length S of the jet moving on the surface of the cleaned blade 2120A is i=nS, where n is the rotational speed of the impeller 212A, and S is the center distance between two axially adjacent impact areas 2201A on each blade 2120A. That is to say, in order to achieve a uniform distribution of impact points, the rotational speed of the impeller 212A is constantly changing, that is, the impeller 212A needs to rotate at a variable speed.

[0077] Specifically, take the example where the angle β between the jet of the nozzle 2212A and the tangent of the moving part 2211A at the first end 22111A is equal to 90°: Figure 4 and Figure 6 As shown, the vertical spray distance between the rotation axis O of the cleaning medium supply member 221A and the blade 2120A being cleaned is h; when the nozzle 2212A rotates around the rotation axis O at an angle θ (i.e., the rotation angle of the cleaning medium supply member 221A) from the vertical spraying of the jet stream to the blade 2120A being cleaned, so that the jet stream moves from point E to point F on the surface of the blade 2120A being cleaned, the oblique spray distance between the rotation axis O of the cleaning medium supply member 221A and the blade 2120A being cleaned is r, and the axial velocity of the jet stream moving on the surface of the blade 2120A being cleaned is V0. At this time, the axial velocity V0 is decomposed to obtain the radial velocity V of the jet stream on the surface of the blade 2120A being cleaned. x and tangential velocity V y .

[0078] More specifically, if Figure 4 As shown, due to the tangential velocity V of the jet on the surface of the cleaned blade 2120A y =ωr, where r is the oblique spray distance between the rotation axis O and the blade 2120A being cleaned, and ω is the angular velocity of the nozzle 2212A rotating around the rotation axis O; therefore, cosθ=h / r; cos∠V y FV0=V y / V0=(rω) / V0. Furthermore, since ∠V y FV0=θ, so h / r=(rω) / V0, and further V0=(ωr 2 It can be understood that, since the angular velocity of the cleaning medium supply member 221A is constant, as the spray distance r changes, the axial velocity V0 of the jet moving on the surface of the cleaned blade 2120A also changes.

[0079] Furthermore, with n i represents the speed of the impeller 212A at the cleaning moment i, and the time it takes for the impeller 212A to rotate one circle, that is, the rotation period of the impeller 212A is T = 1 / n iIn order to achieve a uniform distribution of impact points, the rotation period T of the impeller 212A needs to satisfy the following: T = S / V0, where S is the center-to-center distance between two axially adjacent impact areas 2201A on each blade 2120A, that is, the axial displacement of the jet on the surface of the blade 2120A being cleaned when the impeller 212A rotates one circle. In this case, T = 1 / n i =S / V0, that is, V0=n i S. It is understandable that, since the axial velocity V0 of the jet on the surface of the cleaned blade 2120A is variable, in order to achieve a uniform distribution of the impact points (ie, S remains unchanged), the speed n of the impeller 212A at the cleaning moment i is i It will change over time.

[0080] Thus, V0=n i Substitute S into the above formula V0=(ωr 2 ) / h can be obtained: n i =(ωr 2 ) / (hS). In other words, in order to achieve uniform distribution of the impact points, the speed n of the impeller 212A at the cleaning time i in this example of the present application is i The relationship between the angular velocity ω of the cleaning medium supply member 221A and the angular velocity ω of the cleaning medium supply member 221A is: i =(ωr 2 ) / (hS); where: S is the center distance between two axially adjacent impact areas 2201A on each blade 2120A; r is the inclined spray distance between the rotation axis O and the cleaned blade 2120A.

[0081] In other words, since r = h / cosθ, the above formula can be rewritten as: i =(ωh) / (Scos 2 θ); where: S is the center distance between two axially adjacent impact areas 2201A on each blade 2120A; θ is the rotation angle of the cleaning medium supply member 221A (ie, the nozzle 2212A).

[0082] It is easy to know from the above formula that: when the cleaning medium supply member 221A rotates at a constant speed (ie, the angular velocity ω of the cleaning medium supply member 221A remains unchanged), as the inclined spray distance r or the rotation angle θ (such as Figure 6 As shown in FIG1<θ1<θ2<θ3), the rotation speed n of the impeller 212A increases. i gradually increases (i.e., the impeller 212A rotates at an increasing speed), so that the distance that the jet moves axially on the blade 2120A gradually increases within the same time t (e.g., Figure 6 As shown, M1<M2<M3), thereby achieving uniform distribution of impact points, which is convenient for saving water resources while improving cleaning efficiency.

[0083] Optionally, the rotation speed n of the impeller 212A of the present application is i The angular velocity ω of the cleaning medium supply member 221A can satisfy the relationship: i =(ωr 2 ) / (hP); where P is the cleaning coefficient; r and h are the oblique and vertical spray distances, respectively, between the rotation axis of the cleaning medium supply member 221A and the blade 2120A being cleaned. It will be appreciated that the cleaning coefficient P referred to herein is determined by the center-to-center spacing S between two axially adjacent impact areas 2201A on each blade 2120A.

[0084] For example, in the fourth example of the present application, when the self-cleaning blower 20A performs self-cleaning, the impeller 212A and the cleaning medium supply member 221A both rotate at variable speeds relative to the volute 211A, wherein the angular velocity ω of the cleaning medium supply member 221A at the cleaning time i is i and the speed n of the impeller 212A at the cleaning moment i i Satisfying the relationship ω i =2πC7*n i , where 1 / 1200 ≤ C7 ≤ 1 / 90. Thus, at the same cleaning time i, the center-to-center spacing S between the impact areas 2201A formed by the self-cleaning fan 20A can be larger than the axial dimension of the impact area 2201A and smaller than the axial dimension of the splashing area 2202A, ensuring full-area cleaning while avoiding water waste.

[0085] It is worth noting that in this example of the present application, the self-cleaning fan 20A of the present application can still achieve a uniform distribution of impact points by cooperating with the variable-speed rotating cleaning medium supply member 221A and the variable-speed rotating impeller 212A, that is, the cleaning medium supply member 221A and the impeller 212A are both rotated at variable speeds, and a uniform distribution of impact points can also be achieved.

[0086] Alternatively, as the rotation angle θ of the cleaning medium supply member 221A increases, the cleaning medium supply member 221A slows down and the impeller 212A speeds up, ensuring a uniform distribution of the impact points. In other words, when the cleaning medium supply member 221A slows down, the impeller 212A needs to speed up appropriately to ensure a uniform distribution of the impact points. This shortens the time required to clean the entire impeller 212A, reduces the amount of water used, and reduces the cleaning effect. This is suitable for scenarios where there is less oil on the blades 2120A of the impeller 212A.

[0087] Alternatively, as the rotation angle θ of the cleaning medium supply member 221A increases, both the cleaning medium supply member 221A and the impeller 212A can be decelerated, with the speed of the cleaning medium supply member 221A decreasing more than that of the impeller 212A, thereby ensuring a uniform distribution of the impact points. In other words, when the cleaning medium supply member 221A slows down significantly, the impeller 212A needs to slow down slightly to ensure a uniform distribution of the impact points. In this case, the time required to complete the cleaning of the entire impeller 212A is longer, the amount of water used increases, and the cleaning effect is improved. This is suitable for scenarios where a large amount of oil stains adhere to the blades 2120A of the impeller 212A.

[0088] It is worth noting that if the rotation angle θ of the cleaning medium supply member 221A increases, the cleaning medium supply member 221A and the impeller 212A can both rotate at higher speeds, with the impeller 212A accelerating faster than the cleaning medium supply member 221A. This can also achieve a uniform distribution of impact points, further helping to shorten the cleaning time. However, it should be noted that if the impeller 212A rotates too fast, the cleaning medium will have difficulty impacting the surface to be cleaned of the blades 2120A, resulting in poor cleaning results.

[0089] Furthermore, to further enhance the cleaning effect, the rotation direction of impeller 212A is opposite to the spray direction of cleaning medium supply element 221A. This allows the spray velocity of the cleaning medium to overlap with the rotation velocity of blade 2120A to be cleaned, thereby enhancing the impact effect and improving the cleanliness rate after cleaning. For example, if cleaning medium supply element 221A sprays cleaning medium to the left, if impeller 212A rotates clockwise, the spray velocity of the cleaning medium overlaps with the rotation velocity of blade 2120A to be cleaned, thereby enhancing the impact force and improving the cleaning effect. However, if impeller 212A rotates counterclockwise, the spray velocity of the cleaning medium and the rotation velocity of blade 2120A to be cleaned partially offset each other, meaning that a portion of the spray velocity of the cleaning medium will be used to catch up with blade 2120A to be cleaned, resulting in a weakened impact force and a poorer cleaning effect.

[0090] For example, the angular velocity ω of the cleaning medium supply member 221A is 0.3334 r / min, that is, the cleaning medium supply member 221A rotates 90° in 45 seconds; the speed n of the impeller 212A is 30 r / min, 200 r / min, 300 r / min, 400 r / min, and 500 r / min, respectively. The cleaning rate of the impeller 212A is measured as shown in the following table:

[0091]

[0092]

[0093] In the above table: the initial weight of the impeller and the standard weight of the impeller refer to the weight of the impeller 212A before and after grease application, respectively; the weight after cleaning refers to the weight of the impeller 212A after it is first cleaned by the cleaning medium supply part 221A and then spun dry at high speed (such as 1600r / min). It is easy to see from the above table that: when the cleaning medium supply part 221A rotates at a constant speed, the greater the rotation speed of the impeller 212A, the higher the cleaning rate. However, when the impeller 212A rotates at high speed, the blades 2120A will collide with the water flow at high speed and produce atomization, causing the mist to be discharged from the air outlet of the volute 211A, which is easy to pollute or block the air outlet duct, which is unacceptable for the range hood; therefore, the rotation speed n of the impeller 212A relative to the volute 211A of the present application is preferably greater than or equal to 30r / min, and less than or equal to 200r / min.

[0094] It is worth noting that Figure 2 and Figure 3 As shown, a clearance hole 2110A is provided on the volute 211A of the fan body 21A, the rotation axis O 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 O to drive the nozzle 2212A to enter and exit the volute 211A through the clearance hole 2110A to form a penetration part. In this way, when the impeller 212A needs to be cleaned, the moving part 2211A of the cleaning medium supply member 221A is rotated around the rotation axis O to drive the nozzle 2212A to extend into the volute 211A through the give way hole 2110A and spray the cleaning medium to the blades 2120A; and after passing through the give way hole 2110A, the nozzle 2212A swings around the rotation axis O (that is, reciprocates around the rotation axis O within a certain angle range), so that the spraying area moves back and forth between the axial ends of the impeller 212A, thereby achieving full-area cleaning of the impeller 212A; and when the impeller 212A does not need to be cleaned, the moving part 2211A of the cleaning medium supply member 221A is rotated around the rotation axis O to drive the nozzle 2212A to exit the volute 211A through the give way hole 2110A, thereby preventing the nozzle 2212A from being clogged by oil and dirt in the volute 211A.

[0095] It can be understood that, precisely because the nozzle 2212A in the cleaning medium supply member 221A is tilted outward, when the rotation axis O of the cleaning medium supply member 221A is set outside the volute 211A, the nozzle 2212A starts to spray the cleaning medium only after it is screwed into the volute 211A through the clearance hole 2110A, which can ensure that the impeller 212A is cleaned in the entire area; and when the nozzle extends in the circumferential direction, after the nozzle is screwed into the volute 211A, the angle between the nozzle's spraying direction and the axial direction of the impeller must be less than 90° and gradually decreases. At this time, not only the impact The force loss is large, and the nozzle 2212A needs to spray the cleaning medium before it is screwed into the volute 211A through the give way hole 2110A, so that the entire area of ​​the impeller 212A can be cleaned. However, in order to prevent the oil smoke from leaking out of the give way hole 2110A, the give way hole 2110A is usually provided with a closed door. Therefore, the nozzle cannot spray the cleaning medium to the impeller 212A for cleaning before it is screwed into the volute 211A through the give way hole 2110A, resulting in the circumferentially extending nozzle being unable to clean a certain axial end of the impeller 212A, and thus the entire area of ​​the impeller 212A cannot be cleaned.

[0096] Alternatively, as Figure 1 and Figure 2 As shown, the cleaning device 22A further includes a driving mechanism 222A fixed to the volute 211A and a rotating seat 223A rotatably connected to the driving mechanism 222A, the rotating seat 223A includes a rotating shaft 2231A providing a rotation axis O 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 O, so that the opening position of the clearance hole 2110A can be away from the rotation axis O, which helps to ensure that the power output end of the driving mechanism 222A can be away from the clearance hole 2110A, preventing the driving mechanism 222A from being contaminated by oil leaking from the clearance hole 2110A, and helping to extend the service life of the driving mechanism 222A. It is understood that in other examples of the present application, the driving mechanism 222A can also be fixed to the housing 10A, and can still drive the cleaning medium supply member 221A to swing outside the volute 211A; alternatively, the cleaning medium supply member 221A of the present application can also be rotatably set on the housing 10A, and this application will not repeat this.

[0097] Alternatively, as Figure 2As shown, the end of the connecting arm 2232A is fixedly connected to the second end 22112A of the moving part 2211A, so that a sufficiently long distance is reserved between the nozzle 2212A and the connecting arm 2232A, so as to widen the swing angle range of the nozzle 2212A when a smaller clearance hole 2110A is opened, thereby avoiding structural interference between the connecting arm 2232A and the volute 211A.

[0098] Optionally, the moving portion 2211A can be implemented as an arc-shaped rigid tube so as to minimize the opening size of the clearance hole 2110A while stably supporting the nozzle 2212A; for example, the moving portion 2211A can be, but is not limited to, a hollow tube made of a hard material such as plastic, metal or polymer material.

[0099] It is worth noting that in other examples of the present application, the impeller 212A and the cleaning medium supply member 221A can also be driven to rotate at variable speeds, which can still make the center (impact point) of the impact area on each blade 2120A evenly distributed along the axial direction of the impeller 212A, thereby improving the consistency of full-area cleaning.

[0100] It is understood that, when the impeller 212A rotates at a constant speed and the cleaning medium supply member 221A rotates at a variable speed, the speed of the nozzle 2212A at the same point on the trajectory can be the same during the process of rotating from entering the volute 211A to the maximum angle and during the process of rotating from the maximum angle to exiting the volute 211A. That is, the speed of the nozzle 2212A at the same rotation angle can be the same during the process of the jet ejected by the nozzle 2212A reciprocating between the axial ends of the impeller 212A. When the impeller 212A rotates at a variable speed and the cleaning medium supply member 221A rotates at a constant speed, the speed of the impeller 212A is related to the rotation angle of the nozzle 2212A (or the spray distance of the nozzle 2212A), but the speed of the impeller 212A can also be the same when the nozzle 2212A rotates back and forth to the same angle or position.

[0101] It is worth mentioning that, according to another aspect of the present application, Figure 7 As shown, the first embodiment of the present application further provides a self-cleaning method, which may include the steps of:

[0102] S110: driving the impeller to rotate relative to the volute; and

[0103] S120: driving the cleaning medium supply member to rotate relative to the volute to spray the cleaning medium to the impeller, wherein the angular velocity ω of the cleaning medium supply member relative to the volute is equal to 2πC times the rotation speed n of the impeller relative to the volute, wherein 1 / 1500≤C≤1 / 90.

[0104] It is worth noting that according to another aspect of the present application, Figure 8 As shown, the second embodiment of the present application further provides a self-cleaning method, which may include the steps of:

[0105] S210: rotating the impeller at a constant speed relative to the volute; and

[0106] S220: The cleaning medium supply member is rotated at a variable speed relative to the volute to spray the cleaning medium onto the impeller, wherein the angular velocity ω of the cleaning medium supply member at the cleaning time i is i The relationship between the impeller speed n is: i =(nPcos 2 θ) / h; wherein: P is the cleaning coefficient; θ is the rotation angle of the cleaning medium supply member; h is the vertical spray distance between the rotation axis of the cleaning medium supply member and the blade being cleaned.

[0107] In addition, according to another aspect of the present application, Figure 9 As shown, the third embodiment of the present application further provides a self-cleaning method, which may include the steps of:

[0108] S310: Variable speed rotation of the impeller relative to the volute; and

[0109] S320: Rotate the cleaning medium supply member at a uniform speed relative to the volute to spray the cleaning medium onto the impeller, wherein the impeller has a rotation speed n at the cleaning time i. i The relationship between the angular velocity ω of the cleaning medium supply member and the cleaning medium supply member is: i =(ωr 2 ) / (hP); wherein: P is the cleaning coefficient; r and h are the oblique spray distance and vertical spray distance between the rotation axis of the cleaning medium supply member and the blade to be cleaned, respectively.

[0110] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, 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.

[0111] The above embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by 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; and A cleaning device, the cleaning device includes a cleaning medium supply member rotatably arranged relative to the volute, used for spraying cleaning medium to the impeller for self-cleaning, when the self-cleaning blower performs self-cleaning, the angular velocity ω of the cleaning medium supply member relative to the volute is equal to 2πC times the rotational speed n of the impeller relative to the volute, where 1 / 1500≤C≤1 / 90; so that the two axially adjacent impact areas on each blade will not overlap, and there is no gap between the two axially adjacent splashing areas on each blade, wherein the impact area refers to the area where the cleaning medium sprayed by the cleaning medium supply member directly hits the blade surface, and the splashing area refers to the annular area where the cleaning medium sprayed by the cleaning medium supply member splashes outward when directly hitting the blade surface.

2. The self-cleaning fan according to claim 1, characterized in that: When the self-cleaning blower performs self-cleaning, the impeller and the cleaning medium supply member rotate at a uniform speed relative to the volute, wherein the angular velocity ω of the cleaning medium supply member and the rotational speed n of the impeller satisfy the relationship: ω=2πC2*n, where 1 / 600≤C2≤1 / 90.

3. The self-cleaning blower according to claim 1, characterized in that: When the self-cleaning blower performs self-cleaning, the impeller rotates at a constant speed relative to the volute, and the cleaning medium supply member rotates at a variable speed relative to the volute, wherein the maximum angular velocity ω of the cleaning medium supply member max The impeller speed n satisfies the relationship: ω max =2πC3*n, where 1 / 500≤C3≤1 / 400.

4. The self-cleaning fan according to claim 3, characterized in that: The minimum angular velocity ω of the cleaning medium supply member min The impeller speed n satisfies the relationship: ω min =2πC4*n, where 1 / 1000≤C4≤1 / 800.

5. The self-cleaning fan according to claim 3 or 4, characterized in that: The angular velocity ω of the cleaning medium supply member at the cleaning time i i The relationship between the impeller speed n and ω is: i =(nPcos 2 θ) / h; wherein: P is the cleaning coefficient; θ is the rotation angle of the cleaning medium supply member; h is the vertical spray distance between the rotation axis of the cleaning medium supply member and the blade being cleaned.

6. The self-cleaning blower according to claim 1, characterized in that: When the self-cleaning blower performs self-cleaning, the cleaning medium supply member rotates at a constant speed relative to the volute, and the impeller rotates at a variable speed relative to the volute, wherein the angular velocity ω of the cleaning medium supply member relative to the volute is equal to the maximum speed n of the impeller. max Satisfies the relationship: ω=2πC5*n max , where 1 / 500≤C5≤1 / 400.

7. The self-cleaning blower according to claim 6, characterized in that: The angular velocity ω of the cleaning medium supply member and the minimum rotation speed n of the impeller min Satisfies the relationship: ω=2πC6*n min , where 1 / 75≤C6≤1 / 60.

8. The self-cleaning blower according to claim 6 or 7, characterized in that: The impeller speed n at the cleaning time i i The relationship between the angular velocity ω of the cleaning medium supply member and the angular velocity ω of the cleaning medium supply member is: i =(ωr 2 ) / (hP); wherein: P is the cleaning coefficient; r and h are the oblique spray distance and the vertical spray distance between the rotation axis of the cleaning medium supply member and the blade to be cleaned, respectively.

9. The self-cleaning blower according to claim 1, characterized in that: When the self-cleaning blower performs self-cleaning, the impeller and the cleaning medium supply member rotate at variable speeds relative to the volute, wherein the angular velocity ω of the cleaning medium supply member at the cleaning time i is i The speed n of the impeller at the cleaning moment i i Satisfies the relationship: ω i =2πC7*n i , where 1 / 1200≤C7≤1 / 90.

10. The self-cleaning blower according to any one of claims 1 to 4, characterized in that: The rotational speed of the impeller relative to the volute is greater than or equal to 30 rpm and less than or equal to 200 rpm.

11. A range hood, characterized in that: include: case; and The self-cleaning blower according to any one of claims 1 to 10, wherein the blower body of the self-cleaning blower is disposed within the casing.

12. A self-cleaning method, characterized in that Including steps: driving the impeller to rotate relative to the volute; and Drive the cleaning medium supply member to rotate relative to the volute to spray cleaning medium onto the impeller, wherein the angular velocity ω of the cleaning medium supply member relative to the volute is equal to 2πC times the rotational speed n of the impeller relative to the volute, wherein 1 / 1500≤C≤1 / 90; so that the two axially adjacent impact areas on each blade do not overlap, and there is no gap between the two axially adjacent sputtering areas on each blade, wherein the impact area refers to the area where the cleaning medium sprayed through the cleaning medium supply member directly hits the blade surface, and the sputtering area refers to the annular area where the cleaning medium sprayed through the cleaning medium supply member sputters outward when directly hitting the blade surface.

13. A self-cleaning method, characterized in that Including steps: Rotate the impeller at a constant speed relative to the volute; and The cleaning medium supply member rotates at a variable speed relative to the volute to spray the cleaning medium to the impeller, wherein the angular velocity ω of the cleaning medium supply member at the cleaning time i is i The relationship between the impeller speed n is: i =(nPcos 2 θ) / h; wherein: P is the cleaning coefficient; θ is the rotation angle of the cleaning medium supply member; h is the vertical spray distance between the rotation axis of the cleaning medium supply member and the blade being cleaned.

14. A self-cleaning method, characterized in that Including steps: Rotating the impeller at a variable speed relative to the volute; and The cleaning medium supply member rotates at a constant speed relative to the volute to spray the cleaning medium onto the impeller, wherein the impeller has a rotation speed n at the cleaning time i. i The relationship between the angular velocity ω of the cleaning medium supply member and the cleaning medium supply member is: i =(ωr 2 ) / (hP);wherein: P is the cleaning coefficient; r and h are the oblique spray distance and vertical spray distance between the rotation axis of the cleaning medium supply member and the blade to be cleaned, respectively.

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