CN116066418A

CN116066418A - Self-cleaning fan and range hood

Info

Publication number: CN116066418A
Application number: CN202211335852.7A
Authority: CN
Inventors: 王发银; 韩国强; 张岩
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2021-11-01
Filing date: 2022-10-28
Publication date: 2023-05-05
Also published as: CN116066420A; CN116066424A; CN218862950U; CN114033755A; CN219711906U; CN116066422A; CN116066419A; CN116066421A; CN116066423A; CN218862951U

Abstract

The invention relates to a self-cleaning fan and a range hood, which can ensure larger average flushing force so as to achieve better cleaning effect while realizing global cleaning by rotating a nozzle. The self-cleaning fan comprises a fan main body and a cleaning device. The fan body comprises a volute and an impeller rotatably arranged in the volute, and a plurality of blades are arranged on the circumference of the impeller. The cleaning device comprises a cleaning medium supply part rotatably arranged relative to the volute, the rotation axis of the cleaning medium supply part is perpendicular to the central axis of the impeller, and the long distance ratio x between the injection angle difference y of the cleaning medium supply part when cleaning the two axial ends of the blade and the axial length and the equivalent axial distance of the cleaned blade satisfies the relation: y is less than or equal to-0.184 x ² -2.6392x+76.359; wherein the equivalent axial distance is that the cleaning medium supply part is arranged on the cleaning bladePerpendicular distance between the spray line intersection point and the cleaned blade at both axial ends of (c).

Description

Self-cleaning fan and range hood

The present application claims priority from chinese patent application No. 202111284408.2, entitled "fan washer for extractor hood and extractor hood" filed on the year 2021, month 11, and 01, the entire contents of which are incorporated herein by reference.

Technical Field

The utility model relates to the technical field of kitchen equipment, in particular to a self-cleaning fan and a range hood.

Background

With the continuous progress of self-cleaning technology of the range hood, steam cleaning or water cleaning is widely applied to the self-cleaning field of the range hood, and the basic principle is that steam or water is pumped by a steam generator to convey the steam or water to a nozzle at the tail end of a spray pipe, and the steam or water is rapidly sprayed out of the nozzle to wash an impeller and a volute for cleaning.

At present, the spray pipe is generally provided with fixed holes, the number of the holes is generally more than 3, but the cleaning mode has the following defects: firstly, during cleaning, steam or water is sprayed out from fixed nozzles, and because the nozzles are limited, the cleaning force at intervals among the nozzles is weak, and the cleaning effect is poor; secondly, because the number of the holes is large, the power of the steam generator or the pump is constant, so that the steam pressure or the water pressure from the nozzle is correspondingly low and unstable, and the cleaning effect is poor.

In order to increase the flushing force and improve the cleaning effect and realize comprehensive cleaning, the applicant's prior application, the utility model patent with application number of CN201711480573.9 (publication number of CN 109990332A) and the utility model patent with application number of CN201920819655.X (publication number of CN 210197396U) both propose the design concept of comprehensively cleaning the impeller and improving the cleaning effect by moving the cleaning medium supply part.

However, in the first scheme, a long-strip-shaped abdication hole extending along the moving direction of the cleaning medium supply part has to be formed in the volute, so that the original structure of the fan is greatly modified, the performance of the fan is easy to be influenced, and if a shielding part is additionally arranged, the problem that the shielding part is not opened or closed tightly due to the fact that the shielding part is stuck by viscous grease after long-time use exists; although the second solution does not need to provide a large relief hole, the horizontal feeding type cleaning medium supply member occupies a large amount of end-side space, and the size of the existing product is difficult to support.

Disclosure of Invention

One advantage of the present invention is to provide a self-cleaning blower and range hood that can widen the cleaning range while occupying a small space.

Another advantage of the present invention is to provide a self-cleaning fan and a range hood, wherein in one embodiment of the present invention, the self-cleaning fan can achieve full-coverage cleaning of the impeller under the condition of having smaller yielding holes, so as to reduce modification of the original structure of the fan and reduce influence on performance of the fan.

Another advantage of the present invention is to provide a self-cleaning blower and a range hood, wherein in one embodiment of the present invention, the self-cleaning blower can ensure a large average washing force while achieving global washing by rotating a nozzle, so as to achieve a good washing effect.

Another advantage of the present invention is to provide a self-cleaning blower and extractor hood wherein, in one embodiment of the present invention, the self-cleaning blower reduces or avoids the detrimental effects of oil contamination on the performance of the drive mechanism.

Another advantage of the present invention is to provide a self-cleaning blower and extractor hood wherein expensive materials or complex structures are not required in the present invention to achieve the above objects. Therefore, the invention successfully and effectively provides a solution, not only provides a simple self-cleaning fan and a range hood, but also increases the practicability and reliability of the self-cleaning fan and the range hood.

To achieve at least one of the above or other advantages and objects of the invention, there is provided a self-cleaning blower comprising:

the fan comprises a fan body, a fan body and a fan body, wherein the fan body comprises a volute and an impeller rotatably arranged in the volute, and a plurality of blades are arranged on the circumference of the impeller; and

a cleaning device including a cleaning medium supply member rotatably provided with respect to the scroll casing, a rotation axis of the cleaning medium supply member being perpendicular to a central axis of the impeller, and a long distance ratio x between a jet angle difference y of the cleaning medium supply member when cleaning both axial ends of the vane and an axial length and an equivalent axial distance of the vane to be cleaned satisfying a relation: y is less than or equal to-0.184 x ² -2.6392x+76.359; wherein the equivalent axial distance is the perpendicular distance between the intersection of the spray lines of the cleaning medium supply member when cleaning both axial ends of the blade and the blade being cleaned.

According to one embodiment of the present application, the cleaning medium supply member has a difference y in injection angle of 45 ° or less at the time of cleaning both axial ends of the blade.

According to one embodiment of the present application, the injection angles of the cleaning medium supply member at the time of cleaning both axial ends of the blade are equal.

According to one embodiment of the application, the cleaning medium supply member includes a moving portion extending in a circumferential direction of the rotation axis and a nozzle which is tilted outward from a first end of the moving portion, and an angle between a jet line of the nozzle and a tangent line of the first end of the moving portion is greater than 0 ° and equal to or less than 90 °.

According to one embodiment of the application, the angle between the injection line of the nozzle and the tangent of the first end of the moving part is equal to 90 °.

According to one embodiment of the application, the perpendicular projection position of the rotation axis of the cleaning medium supply part on the central axis of the impeller is equal to the distance between the two axial ends of the impeller.

According to one embodiment of the present application, the volute of the fan body is provided with a relief hole, the rotation axis of the cleaning medium supply part is located at the outer side of the volute, and the moving part is rotated around the rotation axis to drive the nozzle to pass through the relief hole to enter and exit the volute.

According to one embodiment of the application, the cleaning device further comprises a driving mechanism fixedly arranged on the volute and a rotating seat which is in transmission connection with the driving mechanism, wherein the rotating seat comprises a rotating shaft for providing the rotating axis and a connecting arm which extends outwards from the peripheral wall of the rotating shaft, the rotating shaft is coaxially connected with the power output end of the driving mechanism, and the tail end of the connecting arm is fixedly connected with the second end of the moving part of the cleaning medium supply piece.

According to one embodiment of the present application, the relief hole is located on the peripheral annular wall of the volute at a position adjacent to the air inlet of the fan body.

According to one embodiment of the application, the moving part has a hollow channel communicating with the nozzle, the hollow channel of the moving part being used for conveying the cleaning medium to the nozzle.

According to another aspect of the present application, there is further provided a range hood comprising:

a housing; and

the self-cleaning fan of any one of the above, wherein the fan body of the self-cleaning fan is disposed within the housing.

Drawings

Fig. 1 is a schematic perspective view of embodiment 1 of a range hood according to the present invention;

fig. 2 is a schematic perspective view of fig. 1 with the housing omitted (cleaning medium supply member in initial position);

fig. 3 is a longitudinal sectional view of fig. 2, with the water tank, the steam generator and the water receiving box omitted;

FIG. 4 is a left side view of FIG. 3 with the volute and drive omitted;

FIG. 5 is a left side view of the cleaning medium supply member of FIG. 4 rotated to an intermediate position;

FIG. 6 is a left side view of the cleaning medium supply member of FIG. 5 rotated to an end position;

FIG. 7 is a left side view of the cleaning medium supply member rotated to a center plate position with the blower of FIG. 3 being a dual air intake blower;

FIG. 8 is a schematic view of the relative position of the cleaning medium supply member of FIG. 2 with respect to the blades during rotation;

fig. 9 is a flow chart of a self-cleaning prompt of the range hood in embodiment 1 of the present invention;

fig. 10 is a flowchart of global cleaning (taking time as sampling interval) of the range hood according to embodiment 1 of the present invention;

Fig. 11 is a flowchart of the overall cleaning of the range hood according to embodiment 1 of the present invention (taking the number of steps as the sampling interval);

fig. 12 is a flowchart of the oil dipping area collection of the range hood in embodiment 1 of the invention;

fig. 13 is a longitudinal sectional view of the blower, the cleaning medium supply member, and the driving device in the non-operating state in embodiment 2 of the range hood of the present invention;

fig. 14 is a schematic perspective view showing a fan, a cleaning medium supply member and a driving device in a non-operating state in embodiment 3 of the range hood according to the present invention;

fig. 15 is a longitudinal sectional view of the blower, the cleaning medium supply member, and the driving device in the operating state in embodiment 3 of the range hood of the present invention;

fig. 16 is a longitudinal sectional view of the blower, the cleaning medium supply member, and the driving device in the non-operating state in embodiment 4 of the range hood of the present invention;

fig. 17 is a longitudinal sectional view of the blower, the cleaning medium supply member, and the driving device in the working state in embodiment 4 of the range hood of the present invention;

fig. 18 is a schematic cross-sectional view of a range hood according to a preferred embodiment of the present invention;

fig. 19 shows a first example of a self-cleaning blower in a range hood according to the above preferred embodiment of the present invention;

Fig. 20 shows a schematic diagram of a self-cleaning fan according to the first example of the invention described above;

fig. 21 shows a second example of a self-cleaning blower in a range hood according to the above preferred embodiment of the present invention;

fig. 22 shows a schematic diagram of a self-cleaning fan according to the above second example of the invention;

fig. 23 shows a schematic diagram of a fitted curve of the injection angle difference y and the long distance ratio x in the self-cleaning fan according to the above preferred embodiment of the present invention.

Description of main reference numerals: 1. a housing; 2. a blower; 21. a volute; 210. a volute tongue; 211. a relief hole; 212. a drain hole; 22. an impeller; 221. a blade; 222. a middle plate; 23. a driving member; 3. a cleaning medium supply; 30. a penetrating portion; 301. an inlet; 302. an outlet; 31. a rotating seat; 311. a rotating shaft; 312. a connecting arm; 3', a cleaning medium supply; 30', a penetrating portion; 31', a first transmission member; 311', a first rack; 312', a first gear; 313', an elastic stopper; 302', outlet; 3", a cleaning medium supply; 30", a penetrating portion; 31", a second transmission member; 311", a second rack; 312", a second gear; 302", outlet; 313", stop collar; 3131", a bending channel; 4. a driving device; 5. a water tank; 6. a steam generator; 7. a water receiving box; 8. a sensor; 1A, a range hood; 10A, a shell; 20A, a self-cleaning fan; 21A, a fan main body; 211A, a volute; 2110A, relief holes; 212A, impellers; 210A, central axis; 2120A, leaves; 22A, a cleaning device; 221A, a cleaning medium supply; 220A, axis of rotation; 2211A, a moving part; 22110A, hollow passage; 22111A, a first end; 22112A, second end; 2212A, nozzles; 222A, a driving mechanism; 223A, a rotating seat; 2231A, a rotating shaft; 2232A, a connecting arm.

The foregoing general description of the invention will be described in further detail with reference to the drawings and detailed description.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It is noted that when an element is referred to as being "mounted to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.

Example 1:

fig. 1 to 12 show a first preferred embodiment of the range hood according to the present invention. The range hood comprises a shell 1, a fan 2, a cleaning medium supply part 3, a driving device 4, a water tank 5, a steam generator 6, a water receiving box 7 and a sensor 8.

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. As shown in fig. 3, a relief hole 211 is formed in the annular wall of the volute 21 at the position of the volute tongue 210, and a drain hole 212 is formed in the bottom of the volute 21; a plurality of axially extending blades 221 are circumferentially spaced apart from the impeller 22.

The cleaning medium supply member 3 has a tubular shape, and has a front section, a middle section, and a rear section in this order along the flow direction of the cleaning medium, an inlet 301 for the cleaning medium to enter is provided on the end surface of the front section of the cleaning medium supply member 3, the middle and rear sections of the cleaning medium supply member 3 are denoted as penetrating portions 30, the penetrating portions 30 are rigid members, and extend into the scroll 21, and an outlet 302 for the cleaning medium to exit is provided on the end surface of the penetrating portions 30. In this embodiment, the cleaning medium supply member 3 is a rigid member as a whole.

The driving device 4 is a motor and is arranged at a volute tongue 210 of the volute 21, and a power output shaft of the driving device is in transmission connection with the cleaning medium supply piece 3 through the rotating seat 31. Specifically, the rotating base 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 rotation shaft 311, and the second end is connected to the front section of the cleaning medium supply member 3.

The driving device 4 is started to drive the penetrating portion 30 of the cleaning medium supply member 3 to swing relative to the axis of the rotating shaft 311 through the yielding hole 211 (i.e., to reciprocate within a certain angle range around a certain axis), so that the cleaning medium supply member 3 has at least two states:

in the working state, the outlet 302 of the penetrating part 30 extends into the volute 21 and faces the blades 221 of the impeller 22, and the spraying area of the cleaning medium emitted from the outlet 302 of the penetrating part 30 to the blades 221 reciprocates between the two axial end parts of the impeller 22, so that the impeller 22 is cleaned, and the cleaning range of the cleaning medium covers the whole impeller 22;

in the non-operating state, the outlet 302 of the penetrating portion 30 exits the scroll 21, avoiding the blockage of the outlet 302 of the penetrating portion 30.

In the present invention, the "ejection area" refers to an area where the cleaning medium is ejected from the outlet 302 and is formed once contacting the vane 221 of the impeller 22, and does not include an area where the cleaning medium flows along the vane 221 after being ejected onto the vane 221 or is formed after being dropped from the vane 221. The shape and size of the injection region are related to the structure and shape of the outlet 302 itself and the movement of the penetrating portion 30, and the present invention is not limited to the shape and size of the injection region, but may be any one as long as the injection region can be cleaned to a portion between both axial end portions of the impeller 22 by reciprocating movement when the cleaning device is operated.

In addition, as shown in fig. 3, since the movement locus of the penetrating portion 30 is in a nonlinear shape at least at the end far from the outlet 302, that is, at the point B, the minimum distance L between the volute 21 and the end far from the outlet 302 of the penetrating portion 30 is smaller than the length of the penetrating portion 30 in a state where the outlet 302 of the penetrating portion 30 moves to the relief hole 211. In this way, the cleaning medium supply 3 can cover a large cleaning range in a small movable space. On the one hand, the occupied space is small, on the other hand, the original structure of the fan is slightly modified (namely, only the volute 21 is provided with a yielding hole 211 for the penetrating part 30 to penetrate through), and the performance of the fan is not affected.

In order to ensure that the injection area of the cleaning medium injected from the outlet 302 of the penetrating portion 30 toward the vane 221 reciprocates between the two axial ends of the impeller 22, the rotation axis of the penetrating portion 30 is disposed at an angle to the central axis of the impeller 22 (i.e., the angle between the rotation axis of the penetrating portion 30 and the central axis of the impeller 22 is greater than 0 ° and less than 180 °), that is, the rotation axis of the penetrating portion 30 is not parallel to and not overlapping with the central axis of the impeller 22, because: when the rotation axis of the penetrating portion 30 is parallel to or overlaps with the central axis of the impeller 22, the injection area of the cleaning medium injected from the outlet 302 of the penetrating portion 30 toward the blades 221 moves back and forth along the circumferential direction of the impeller 22, so that when the rotating penetrating portion 30 injects steam toward the rotating impeller 22, the injection area covers only one annular surface with a narrow outer circumference of the impeller 22, and cannot cover other positions of the impeller 22 in the axial direction, and the rotation of the penetrating portion 30 loses meaning, because in this case, the same cleaning effect can be achieved even if the penetrating portion 30 does not rotate. In this embodiment, the rotation axis of the penetrating portion 30 is perpendicular to the central axis of the impeller 22, and the plane of the rotation track of any point at the outlet 302 of the penetrating portion 30 is parallel to the central axis of the impeller 22, so that the spraying area of the cleaning medium ejected from the outlet 302 of the penetrating portion 30 to the blades 221 moves along the axial direction of the impeller 22, that is, the length direction of the blades 221, and the stroke is the shortest. Of course, in practical applications, it may not be possible to precisely ensure that the motion trajectory of the injection region is completely parallel to the central axis of the impeller 22, and when the motion trajectory deviates from the central axis of the impeller 22 by a certain angle, the cleaning of the whole impeller 22 can still be completed, but the stroke of the injection region is relatively prolonged.

In order to avoid the interference between the penetrating portion 30 and the volute 21 during the rotation process when the hole diameter of the relief hole 211 is smaller, the portion of the penetrating portion 30 penetrating the relief hole 211 during the movement is an arc segment, the center of the arc segment is located on the axis of the rotation shaft 311 (i.e. the rotation axis of the penetrating portion 30), the outer diameter of the arc segment is denoted as D1, the hole diameter of the relief hole 211 is denoted as D2, and the relationship between D1 and D2 satisfies: d1 is more than or equal to d2 is more than or equal to 1.2D1. Of course, d1=d2 is designed to be optimal, so that the arc section of the penetrating portion 30 can be guaranteed to always block the yielding hole 211 in the rotation process, on one hand, cleaning medium and oil dirt in the volute 21 are prevented from splashing out through the yielding hole 211, and on the other hand, the normal operation of the fan 2 can be prevented from being influenced. Of course, in practical application, the shape of the relief hole 211 may be designed into a square shape, so long as the cross-sectional shape of the arc segment is adapted to the shape of the relief hole 211.

In addition, as shown in fig. 7, it is verified through experiments that, for the impeller with double air intake (the impeller 22 has the middle disc 222), the front end is generally the main air intake, the rear end is the auxiliary air intake, and the greasy dirt is concentrated at the position where the blade 221 passes through the middle disc 222, based on the above phenomenon, in this embodiment, the cleaning medium supply member 3 is disposed close to the middle disc 222 when being disposed, so that the injection path from the outlet 302 of the penetrating portion 30 to the impeller 22 is shortest when the injection area corresponds to the middle disc 222 (i.e. the injection area moves to the position where the blade 221 passes through the middle disc 222), and under the same injection condition, the shorter the injection path, the larger the injection force is, which is helpful for uniformly cleaning the whole impeller according to the distribution amount of the greasy dirt.

In order to ensure that the flushing time of each point on the vane 221 is substantially the same, the reciprocating motion of one point a of the cleaning medium in the axial direction between the two axial ends of the impeller 22 at the injection area where the cleaning medium is injected to the impeller 22 is required to be set to a uniform motion, and the motion of the penetrating portion 30 is preferably set to a variable speed motion, and the derivation formula is as follows:

as shown in fig. 8, θ is an angular position corresponding to the penetrating portion 30 at different times, and according to Δt as a unit time, the variable speed motion is decomposed into a plurality of uniform speed motions, and any one of the uniform speed motions is selected, and when Δt is close to 0, the rotation angle Δθ of the penetrating portion 30 in the unit time is:

due to v ₀ t=h tan θt, i.e

Thus, the first and second substrates are bonded together,

wherein the point A at the injection area of the cleaning medium toward the impeller 22 is defined as the point A at the outlet 302 from the penetration portion 30 ₀ Injecting; omega is the rotation speed of the penetrating part 30; θ is the rotation angle of the penetrating portion 30; h is the point A at the outlet 302 of the penetrating portion 30 ₀ A minimum distance of the rotation center of (2) from the vane 221 ejected at the point a at the ejection area; v ₀ Is the speed of movement of point a at the spray zone.

In this embodiment, when t=0, θ=0.

The water tank 5 has a water inlet end and a water outlet end for storing water, and in this embodiment, the top of the water tank 5 has an opening as the water inlet end.

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 communicated with 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 communicated with the inlet 301 of the cleaning medium supply member 3 through a steam pipe 62. In this embodiment, the water inlet end of the steam generator 6 is integrated with a suction pump.

The top of the water receiving box 7 has an opening, and the water receiving box 7 is located right under the drain hole 212 of the scroll 21 for receiving 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 one side wall, so that the installation is convenient.

Because self-cleaning requires users to add clear water and pour waste water, the quantity of water is a factor of concern for the users, if the quantity of water required in the cleaning process is excessive, women with less strength feel operation effort, use experience of the users is affected, and satisfaction of products is reduced; also, if a user is required to wait beside the range hood, the office workers with a fast work rhythm can be dissatisfied by adding clear water and pouring waste water for a plurality of times. Therefore, the self-cleaning technology of the range hood should use little water, so the capacity of the water tank 5 and the water receiving box 7 is approximately 650 ml.

The sensor 8 is installed at a position of the penetrating portion 30 near the outlet 302 for detecting the amount of oil stain at each position in the axial direction between both end portions of the impeller 22 in the axial direction. In this embodiment, the sensor 8 is a humidity sensor, after the cleaned impeller 22 has locally left oil dirt, after the impeller 22 is thrown away at a high speed, water and flowing oil dirt on the blade 221 are both thrown away, the metal surface is in a dry state, the surface humidity of the oil dirt is far higher than that of the metal blade surface after the oil dirt adsorbs water, at this time, the oil dirt with high water content can be detected by the humidity sensor, and the positioning of the oil dirt is performed, specifically, because during the rotation of the penetrating part 30, the sensor 8 rotates synchronously, a detection area of a detection medium emitted from the sensor 8 towards the blade 221 moves reciprocally along the axial direction of the impeller 22, namely the length direction of the blade 221, so that the humidity of the corresponding detection area is detected, after the impeller 22 is thrown away at a high speed, the water is easily thrown away at the position with less oil dirt, the water residue at the position with more oil dirt is relatively high, and therefore the higher humidity represents the more oil dirt amount; the surface temperature detection sensor can be used for expanding, and because of different heat conductivity coefficients of metal and oil stains, obvious temperature difference exists between the metal surface and the oil stain surface in a short time of centrifugal throwing, and the oil stains can be identified by using a thermal imaging principle, so that the aim of detecting the oil stains is fulfilled.

Of course, the cleaning medium supply member 3, the driving device 4, the water tank 5, the steam generator 6, the water receiving box 7 and the sensor 8 may also constitute a separate cleaning device, and the cleaning device is not limited to the cleaning impeller 22, and may also be used for cleaning other components of the range hood, such as the inner wall of the volute 21, etc. In the cleaning device, the penetrating part 30 of the cleaning medium supply member 3 is used as a moving part and is driven by the driving device 4 to swing so that the outlet 302 of the moving part has an arc-shaped moving track, thus, under the condition that the moving range of the cleaning medium supply member 3 is smaller, the cleaning medium emitted from the outlet 302 of the moving part can cover a larger cleaning range, and the cleaning device occupies a small space and has a wide cleaning range; in addition, the moving part is arc-shaped, and the circle center of the moving part is positioned on the rotating axis of the moving part, so that the moving range of the moving part can be reduced as far as possible, and the excessive space occupation of the moving part is avoided.

The working principle of this embodiment is as follows:

(1) The driving member 23, the driving device 4 and the steam generator 6 are started, 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, the steam is conveyed to the cleaning medium supply member 3 through the steam pipe 62, the rotating penetrating part 30 sprays the steam to the rotating impeller 22, so that the spraying area of the steam axially reciprocates between the front end part and the rear end part of the impeller 22, and the whole impeller 22 is cleaned globally:

(1) As shown in fig. 4, the cleaning medium supply member 3 is at the initial position, and the steam emitted from the outlet 302 of the penetrating portion 30 is sprayed toward the rear end edge of the vane 221;

(2) as shown in fig. 5, as the cleaning medium supply member 3 is further rotated, the position at which the outlet 302 of the penetrating portion 30 is aimed is moved toward the front end, and the steam injection area is slowly moved toward the front end;

(3) as shown in fig. 6, when the ejection area reaches the forefront of the blade 221, the driving device 4 switches the rotation direction, and the secondary flushing is started to the blade 221;

(4) until the injection zone returns to the rearmost end of the vane 221, the driving device 4 switches the rotation direction again, repeating the above-mentioned movement;

when the cleaning is completed, in the non-working state, the cleaning medium supply member 3 rotates outwards to completely separate from the abdication hole 211, so that the outlet 302 of the penetrating part 30 exits the volute 21, and the risk of blocking the outlet 302 of the penetrating part 30 caused by long-term placement in the volute 21 is avoided as much as possible, however, because the abdication hole 211 is not blocked any more, the air flow in the volute 21 is still easy to be blocked by the way that the abdication hole 21 is punched to the outlet 302 of the penetrating part 30;

(2) After global cleaning is completed, the impeller 22 is started to rotate at a high speed, grease and cleaning liquid are thrown away from the impeller 22, then a grease test sensor is started to detect the grease on the blades 221, and the detection result is recorded into a database;

After global cleaning, centrifugal force of high-speed stripping and throwing is used for throwing away, so that loose oil stains and cleaning water are flushed away, the burden of accurate cleaning is reduced, and the liquid oil-water mixture covers the oil stain surface and weakens the cleaning force of high-pressure jet flow;

(3) When the region cleaning is started, the cleaning medium supply part 3 is actively positioned to a point with oil stains, fixed-point cleaning is started until the region is completely cleaned, a plurality of oil stains are sequenced, and the region with large oil stain area is preferentially cleaned;

because the current self-cleaning technology is that users add water by themselves, if too much water is added to users at every time, burden and risk are formed for adding water, storing waste water and pouring waste water, impellers 22 cannot be cleaned through one-time complete cleaning under normal conditions, and the positions with more sticky oil points can be cleaned preferentially through regional cleaning, so that the cleaning rate is effectively improved.

As shown in fig. 9, the self-cleaning prompt of the range hood is performed by the following method before self-cleaning:

s001, starting to read the time T1 from the last cleaning to the present, reading the time T2 from the last cleaning to the present accumulated use time, and entering S002;

s002, judging whether the values of T1 and T2 meet the following conditions: t1 is greater than D and T2 is greater than H, if yes, enter S003, if no, enter S005;

S003, lighting a self-cleaning prompt, and entering S004;

s004, judging whether the user starts self-cleaning, if so, entering S005, and if not, returning to S003;

s005, closing the self-cleaning prompt, and ending;

wherein D is the maximum cleaning interval time allowed in the normal state, grease is easy to remove when the grease is just adhered to the surface of the impeller, the adhered grease is gradually oxidized along with the time, and cleaning is efficient before the grease is oxidized, so the value of D is preferably 1-180 days, optimally 90 days, and the grease oxidation rate is low;

h is the maximum accumulated use time allowed under the normal state, and for some users, the time length of the accumulated time from the last cleaning time to the current time is defined under the condition of small use at ordinary times, and for the users with small use at ordinary times, frequent cleaning is not needed, and the value of H is preferably 1-180H, and is optimally 60H.

The control method for implementing self-cleaning operation of the range hood comprises the following steps:

step one, spraying the cleaning medium to the rotating impeller 22 by moving the cleaning medium supply member 3 so that the spraying area of the cleaning medium moves back and forth in the axial direction between the front end portion and the rear end portion of the impeller 22, and overall cleaning is performed on the whole impeller 22;

Specifically, as shown in fig. 10, the first step is implemented by the following method:

s101, starting, wherein the initial value of θ is 0, the initial value of t is 0, and starting the driving piece 23 to drive the impeller 22 to rotate, and entering S102;

s102, starting the driving device 4 to drive the cleaning medium supply member 3 to rotate forward, ω=f (θ), recording ta, and proceeding to S103;

s103, collecting t and theta values, and entering S104;

s104, judging whether the theta value meets the following conditions: θ is greater than or equal to θmax, if yes, enter S106, if no, enter S105;

s105, judging whether the t value meets the following conditions: t-ta is greater than or equal to Δt, if yes, returning to S102, if no, returning to S103;

s106, starting the driving device 4 to drive the cleaning medium supply member 3 to reverse, ω=f (t), recording tb, and proceeding to S107;

s107, acquiring t and theta values, and entering S108;

s108, judging whether the theta value meets the following conditions: θ is less than or equal to 0, if yes, enter S110, if no, enter S109;

s109, judging whether the t value meets the following conditions: t-tb is not less than Δt, if yes, returning to S106, if no, returning to S107;

s110, judging whether the t value meets the following conditions: t is more than or equal to t0, if yes, entering S111, otherwise, returning to S102;

s111, closing the driver 23 and the driving device 4, ending;

wherein θmax is a rotation angle of the cleaning medium supply member 3 when the injection region is located at the forefront end of the impeller 22, and is preferably 30 to 75 °;

Δt is the time interval between two adjacent speed changes of the driving device 4, the smaller the value is, the more can the cleaning medium be guaranteed to be shot to the injection area at the impeller 22, the reciprocating motion along the axial direction between the two axial end parts of the impeller 22 at one point A is guaranteed to be uniform, and the value is preferably 1-100 ms;

t0 is the total overall cleaning time, and the value is preferably 10-20 min;

of course, Δθ may be used as the rotational angle interval between two adjacent shifts of the drive device 4, and this value is preferably 0.1 to 1 °.

In addition, a stepping motor may be used as the driving device 4, so that, as shown in fig. 11, the above-mentioned step one may be implemented by the following method:

s101, starting, wherein the initial value of θ is 0, the initial value of n is 0, and starting the driving piece 23 to drive the impeller 22 to rotate, and entering S102;

s102, starting the driving device 4 to drive the cleaning medium supply member 3 to rotate forward, ω=f (θ), recording na, and proceeding to S103;

s103, acquiring n and theta values, and entering S104;

s105, judging whether the n value meets the following conditions: n-na is greater than or equal to Deltan, if yes, returning to S102, and if not, returning to S103;

s106, starting the driving device 4 to drive the cleaning medium supply member 3 to reverse, ω=f (t), recording nb, and proceeding to S107;

S107, acquiring n and theta values, and entering S108;

s109, judging whether the n value meets the following conditions: n-nb is greater than or equal to Deltan, if yes, returning to S106, and if not, returning to S107;

s111, closing the driver 23 and the driving device 4, ending;

where n is the number of steps of the stepper motor, since the stepper motor step angle=360°/(rotor tooth number n), the value of θ can be calculated in case n is determined;

delta n is the step number interval between two adjacent gear changes of the stepper motor, and the value is preferably 1-200.

Step two, generating centrifugal force by rotating the impeller 22, so as to remove the cleaning medium and grease on the surface of the impeller 22;

specifically, the steps are realized by the following method: starting the driving piece 23, setting the rotating speed at 1500-3000 r/min, dehydrating and deoiling for 0.1-10 min, and then closing the driving piece 23;

detecting oil stain amounts at all positions along the axial direction between two axial end parts of the impeller 22 through the rotation sensor 8, and collecting oil-stained areas of the impeller 22;

specifically, as shown in fig. 12, the above-mentioned step three is implemented by the following method:

S301, starting, namely enabling the sensor 8 to start, wherein 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, and entering S302;

s302, starting the driving device 4 to drive the cleaning medium supply member 3 to rotate forward, ω=f (θ), recording ta, and proceeding to S303;

s303, judging whether the t value meets the following conditions: t-tc is greater than or equal to Deltat', if yes, enter S304, if no, enter S307;

s304, collecting

Recording tc, proceeding to S305;

s305, judging

Whether the value satisfies: />

If yes, go to S306, if no, go to S307;

s306, record θn, let n=n+1, and enter S307;

s307, collecting t and theta values, and entering S308;

s308, judging whether the theta value meets the following conditions: θ is greater than or equal to θmax, if yes, enter S3010, if no, enter S309;

s309, judging whether the t value meets the following conditions: t-ta is greater than or equal to Δt, if yes, returning to S302, if no, returning to S303;

s3010, closing the driving device 4 and the sensor 8, and ending;

Δt is the time interval between two adjacent shifts of the driving device 4, and the smaller the value is, the more the spraying area of the cleaning medium to one point A in the impeller 22 can be ensured to reciprocate along the axial direction between the two axial ends of the impeller 22 to be uniform-speed motion, and the value is preferably 1-100 ms;

Δt' is the time interval between two adjacent samples of the sensor 8, the smaller the value, the greater the sampling accuracy, the value is preferably 1 to 100ms;

the maximum oil stain representation value allowed under the normal state is preferably 20-100% (humidity) in the embodiment;

step four, the cleaning medium is sprayed to the rotating impeller 22 by moving the cleaning medium supply member 3, so that the spraying area of the cleaning medium moves back and forth along the axial direction between the front end part and the rear end part of the oil dipping area, and the oil dipping area is subjected to area cleaning.

Specifically, the above steps are realized by the following method: firstly, sorting oil stain areas collected in the step three according to the area size, and then sequentially carrying out area cleaning on the oil stain areas according to the descending order of the area size, namely, rotating a cleaning medium supply part 3 to a corresponding rotating angle theta ' n to carry out area cleaning, wherein a stable included angle is formed between a sensor 8 and the cleaning medium supply part 3, so that delta theta ' is required to be used for correcting step difference during data processing, namely, theta ' n=thetan+delta theta ', delta theta ' is the included angle between a cleaning medium injection path of the cleaning medium supply part 3 and a detection medium injection path of the sensor 8; as to how to sort the oil stain areas according to the area, in this embodiment, the recorded θ1, θ2, … …, θn are analyzed to determine whether to find 2 consecutive oil dipping points and 3 oil dipping points … …, specifically, whether to detect the rotation angle in one unit time through two adjacent oil dipping points, whether to detect the rotation angle in two unit times, and finally to implement accurate cleaning in reverse order, because the more the database is counted later, the more the description is continuous.

Example 2:

as shown in fig. 13, a second preferred embodiment of the range hood of the present invention is shown. The difference from example 1 is that:

in this embodiment, as shown in fig. 13, in the non-working state, the end face of the penetrating portion 30 is opposite to the relief hole 211, and the outlet 302 of the penetrating portion 30 is located on the adjacent side wall of the end face, so that in the non-working state, the airflow in the volute 21 is not easy to be blocked by the relief hole 21 towards the outlet 302 of the penetrating portion 30.

Example 3:

fig. 14 and 15 show a third preferred embodiment of the range hood according to the present invention. The difference from example 2 is that:

in this embodiment, the cleaning medium supply member 3 'is in the form of a spiral, wherein the rear section is a penetrating portion 30', and the cleaning medium supply member 3 'is in driving connection with 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 stopper 313'. Specifically, the first rack 311' is disposed at a first side of the cleaning medium supply member 3' in 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 meshed with the first rack 311'; the elastic stopper 313' is installed on the scroll 21 at the second side of the cleaning medium supply member 3' such that the cleaning medium supply member 3' is interposed between the first gear 312' and the elastic stopper 313'.

The driving device 4 is started to drive the first gear 312' to rotate, and the first rack 311' drives the cleaning medium supply part 3' to perform vortex-shaped curve motion relative to the volute 21 due to the meshing of the first rack 311' and the first gear 312 '.

The working principle of this embodiment is as follows:

(1) As shown in fig. 14, in the non-operating state, the outlet 302' of the penetrating portion 30' exits the scroll 21, avoiding the risk of blockage of the outlet 302' of the penetrating portion 30″ due to long-term placement in the scroll 21;

(2) When cleaning is required, the driving device 4 drives the cleaning medium supply member 3' to perform a scroll-like curved motion with respect to the scroll casing 21 so that the outlet 302' of the penetrating portion 30' extends into the scroll casing 21 and faces the vane 221 of the impeller 22, and in an operating state, as shown in fig. 15, the rotational direction of the driving device 4 is periodically changed so that the injection region of the cleaning medium injected from the outlet 302' of the penetrating portion 30' to the vane 221 can be reciprocally moved between both axial end portions of the impeller 22, thereby cleaning the impeller 22.

Example 4:

as shown in fig. 16 and 17, a fourth preferred embodiment of the range hood of the present invention is shown. The difference from example 2 is that:

in this embodiment, the relief hole 211 is formed on the end wall of the volute 21, the cleaning medium supply member 3 "is a flexible strip-shaped pipe, the rear section thereof is a penetrating portion 30", the cleaning medium supply member 3 "is in transmission connection with the power output end of the driving device 4 through a second transmission assembly 31", and the second transmission assembly 31 "includes a second rack 311", a second gear 312 "and a limiting sleeve 313". Specifically, the number of the second racks 311 "is at least two, the second racks 311" are sequentially sleeved on the cleaning medium supply member 3 "along the extending direction of the cleaning medium supply member 3", and adjacent ends of two 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 be meshed with each second rack 311"; the spacer 313 "is mounted on the scroll 21 and has a bent passage 3131" inside through which the cleaning medium supplier 3 "and the second rack 311" pass.

The driving device 4 is started to drive the second gears 312 "to rotate, and the second racks 311" can be meshed with the second gears 312", so that the second racks 311" drive the cleaning medium supply member 3' to move relative to the spiral case 21, and in the moving process, the outlet 302 "of the penetrating part 30" moves linearly, and one end of the penetrating part 30 "away from the outlet 302" moves along the bending channel 3131", and the movement track of the penetrating part is in a nonlinear shape, and the nonlinear shape can be a curve, a fold line, or the like, can be a regular track or an irregular track, so long as the non-linear movement is ensured.

The working principle of this embodiment is as follows:

(1) As shown in fig. 16, in the non-operating state, the outlet 302 "of the penetrating portion 30" exits the volute 21, avoiding the risk of blocking the outlet 302 "of the penetrating portion 30" due to long-term placement in the volute 21, and the cleaning medium supply member 3 "is disposed along the bending channel 3131" under the limit of the limit sleeve 313", so as to reduce the occupied space;

(2) When cleaning is needed, the driving device 4 drives the cleaning medium supply member 3″ to move backwards relative to the volute 21 so that the outlet 302″ of the penetrating portion 30″ extends into the volute 21 and faces the vane 221 of the impeller 22, as shown in fig. 17, in the working state, the cleaning medium supply member 3″ extending into the volute 21 can restore the strip-shaped structure under the action of self elasticity, the rotation direction of the driving device 4 is periodically changed, and the cleaning medium ejected from the outlet 302″ of the penetrating portion 30″ can be made to reciprocate between the two axial end portions of the impeller 22 toward the injection region of the vane 221, so as to clean the impeller 22; the cleaning medium supply part 3' exposed out of the volute 21 is arranged along the bending channel 3131 ' under the limit of the limit sleeve 313 ', thereby reducing the occupied space.

It is noted that in the above embodiments 1 to 3 of the present application, the cleaning medium supply member 3 (3 ') is rotated with respect to the scroll 21 of the blower 2, so that the injection region where the cleaning medium injected from the cleaning medium supply member 3 (3') is injected toward the impeller 22 reciprocates between the axial ends of the impeller 22, thereby achieving the global cleaning of the entire impeller. However, when the cleaning medium supply member 3 (3 ') rotates relative to the scroll 21, both the ejection distance of the cleaning medium supply member 3 (3'), i.e., the length of the ejection flow from the cleaning medium supply member 3 (3 ') to the impeller 22, and the ejection angle, i.e., the angle between the ejection flow from the cleaning medium supply member 3 (3') to the impeller 22 and the plane perpendicular to the center axis of the impeller 22, are constantly changed; at the same time, when the axial position of the cleaning medium supply member 3 (3') with respect to the impeller 22 is changed, the ejection distance and the ejection angle are also changed. Since the spraying distance and the spraying angle both affect the washing force and further affect the washing effect, the position relationship configuration between the washing medium supply part 3 (3 ') and the impeller 22 is particularly important, that is, how to reasonably design the position of the washing medium supply part 3 (3') relative to the impeller 22 is a key to obtain a better washing effect (i.e. to achieve better washing force and spraying angle).

Specifically, according to another aspect of the present application, as shown in fig. 18 to 23, a preferred embodiment of the present application provides a range hood 1A, which may include a housing 10A and a self-cleaning blower 20A mounted to the housing 10A, for exhausting oil. 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 receiving box, and/or a sensor to assist in performing a range hood function, and is not described herein.

More specifically, as shown in fig. 19 to 23, the self-cleaning blower 20A of the present application may include a blower main body 21A and a cleaning device 22A. The fan body 21A may include a scroll 211A and an impeller 212A rotatably provided in the scroll 211A, the impeller 212A being provided with a plurality of blades 2120A in a circumferential direction. The cleaning device 22A may include a rotatable arrangement relative to the volute 211AThe rotational axis 220A of the cleaning medium supply 221A is perpendicular to the central axis 210A of the impeller 212A, and the long distance ratio x between the injection angle difference y of the cleaning medium supply 221A at both axial ends of the cleaning blade 2120A and the axial length and equivalent axial distance of the blade 2120A satisfies the relation: y is less than or equal to-0.184 x ² -2.6392x+76.359; wherein the equivalent axial distance is the distance between the intersection of the injection lines of the cleaning medium supply member 221A at both axial ends of the cleaning blade 2120A and the cleaned blade 2120A. It will be appreciated that the fan body 21A referred to herein further includes a driving member, such as a motor, for driving the impeller 212A to rotate about the central axis 210A; the rotation axis 220A referred to herein refers to a straight line about which the cleaning medium supply member 221A rotates with respect to the scroll 211A; the jet line referred to in this application refers to a straight line where a jet stream formed by jetting the cleaning medium via the cleaning medium supply 221A is located.

It should be noted that the perpendicular angle mentioned in the present application is not limited to 90 °, and it is considered that the angle between the rotation axis 220A and the central axis 210A is within 90±10°, and the rotation axis 220A of the cleaning medium supply 221A mentioned in the present application is perpendicular to the central axis 210A of the impeller 212A. It is understood that the unit of the injection angle difference y referred to in this application is degrees, such as y 45 deg..

Furthermore, the axial ends of the blade 2120A referred to herein may be implemented as, but are not limited to, two physical ends of the blade 2120A (i.e., to effect global cleaning of the blade); in other examples of the present application, the axial ends of the blade 2120A may be implemented as the axial ends of the cleaning region on the blade 2120A (i.e. the entire cleaning or the partial cleaning of the blade may be achieved), which will not be described in detail herein.

Notably, a plurality of blades 2120A extending in the axial direction are circumferentially arranged on the impeller 212A at intervals, and the outer contour of the impeller 212A is defined by the outer edges of the plurality of blades 2120A; that is, as shown in fig. 20 and 22, when both axial ends of a certain blade 2120A are respectively cleaned by the cleaning medium supply member 221A, the cleaning medium supply member 221A sprays cleaning liquidThe jet flow formed by the cleaning medium forms an angle a with the plane perpendicular to the central axis 210A of the impeller 212A ₁ And a ₂ The injection angle difference y= |a mentioned in the present application ₁ -a ₂ I (I); the equivalent axial distance referred to herein refers to the vertical distance S between the equivalent rotational axis of the cleaning medium supply 221A and the blade 2120A being cleaned; the axial length of the blade 2120A referred to herein is denoted as H, and the long pitch ratio x=h/S referred to herein.

It is understood that the equivalent axis of rotation of cleaning medium supply 221A of the present application refers to a straight line passing through the injection line intersection and parallel to axis of rotation 220A. In addition, as the cleaning medium supply 221A rotates relative to the volute 211A, the spray area formed by the cleaning medium contacting the blade 2120A moves axially from one end of the blade 2120A to the other end, during which the cleaning medium supply 221A sprays cleaning medium at an angle between the spray and the central axis 210A of the impeller 212A from a ₁ Gradually decrease to 0 DEG and then gradually increase to a ₂ 。

Through calculation, when the ratio x of the injection angle difference y to the long distance in the self-cleaning fan 20A of the application meets the relation y less than or equal to-0.1318 x ² At +2.8652x+29.647, the average spray angle of the cleaning medium supply 221A is small when cleaning the entire blade 2120A, so that the average component of the flushing force of the spray in the direction perpendicular to the blade 2120A is large, facilitating the impeller cleaning. In particular, when y= -0.184x, compared to zero injection angle difference y ² At-2.6392x+76.359, the average washing force of the washing medium supply part 221A for washing the whole blade 2120A is reduced by less than 30%, so that the flexibility of the arrangement of the position relationship between the washing medium supply part 221A and the impeller 212A is increased while the better washing effect is realized, the interference with the structures such as the shell 10A or the volute 211A is avoided, and the assembly is convenient. It can be understood that the relation between the injection angle difference y and the long distance ratio x is formed by fitting multiple points as shown in fig. 23, wherein each point is the injection angle difference when the average impact force is reduced by 30% at the corresponding long distance ratio x, which is not repeated hereinSaid.

Alternatively, as shown in fig. 22, the injection angle difference y of the cleaning medium supply member 221A at both axial ends of the cleaning blade 2120A is 45 ° or less, so that the positional design of the cleaning medium supply member 221A with respect to the impeller 212A is facilitated by quantifying the constraint condition of the injection angle difference y.

The value of the long distance ratio x of the self-cleaning fan 20A is generally between 1.03 and 4.80, which is limited by the matching relationship between the housing 10A and the fan main body 21A, so it can be known from the above relationship: the spray angle difference y of the self-cleaning blower 20A is preferably less than 30 ° so as to adapt to most sizes of blowers, and achieve a good flushing effect.

Preferably, as shown in fig. 20, the injection angles of the cleaning medium supply member 221A at both axial ends of the cleaning blade 2120A are equal, that is, the injection angle difference y=0 of the cleaning medium supply member 221A at both axial ends of the cleaning blade 2120A is the greatest, and the average washing force of the cleaning medium supply member 221A at the time of washing the entire impeller is the best.

Notably, the cleaning effect is evaluated by the ratio of the amount of oil stain cleaning after cleaning to the weight increase of the oil stain before cleaning as the cleaning rate; from the test under the same conditions, it is known that: when the perpendicular projection of the equivalent rotation axis of the cleaning medium supply 221A on the impeller 212A of the present application is at the axial end point of the impeller 212A, the injection angle difference y > -0.184x ² -2.6392x+76.359, the oil stain weight increase at this time is 12.37g, the oil stain cleaning amount is 6.78g, and the cleaning rate is 54.8% through calculation; when the perpendicular projection of the equivalent rotational axis of the cleaning medium supply 221A of the present application onto the impeller 212A is at 10% of the axial length of the impeller 212A, the spray angle difference y is approximately-0.184 x ² -2.6392x+76.359, at this time, the oil stain weight increase is 12.5g, the oil stain cleaning amount is 8.37g, and the cleaning rate is 67% through calculation; when the equivalent rotation axis of the cleaning medium supply part 221A of the present application is projected on the impeller 212A at 42% of the axial length of the impeller 212A, the injection angle difference y is close to 0 °, the oil stain weight is 12.66g, the oil stain cleaning amount is 9.26g, and the calculation shows thatThe cleaning rate is 73.1%; aiming at the existing steam cleaning scheme, the oil stain weight increase is 13.81g, the oil stain cleaning amount is 5.55g, and the calculated cleaning rate is 40.2%; aiming at the existing distilled water cleaning scheme, the weight increase of oil stains is 13.78g, the cleaning amount of the oil stains is 4.85g, and the calculated cleaning rate is 35.02%. In summary, compared with the existing cleaning scheme, the cleaning effect of the self-cleaning fan 20A is improved, and especially when the ratio of the jet angle difference y to the long distance x satisfies the relation y less than or equal to-0.184 x ² In the case of-2.6392x+76.359, the cleaning effect is obviously improved, which has important significance for cleaning the greasy dirt of the range hood.

According to the above-described embodiment of the present application, as shown in fig. 19 and 21, the cleaning medium supply member 221A includes the moving portion 2211A extending along the circumferential direction of the rotation axis 220A and the nozzle 2212A which is tilted outward from the first end 22111A of the moving portion 2211A, and an angle β between the injection line of the nozzle 2212A and the tangent line of the moving portion 2211A at the first end 22111A is greater than 0 ° and equal to or less than 90 °. In this way, 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 is shorter in this embodiment of the present application, which contributes to reduction of the loss of the flushing force, compared to the case where the nozzle 2212A extends in the circumferential direction or tangential direction of the moving portion 2211A.

Illustratively, in the first example of the present application, as shown in fig. 19 and 20, the angle β between the injection line of the nozzle 2212A and the tangent line of the moving portion 2211A at the first end 22111A is equal to 90 ° so that the injection direction of the nozzle 2212A is perpendicular to the tangent line direction of the moving portion 2211A at the first end 22111A, thereby minimizing the average distance between the nozzle 2212A and the blade 2120A, so as to further reduce the loss of the flushing force. It will be appreciated that in this example of the present application, the equivalent axis of rotation of cleaning medium supply 221A coincides with axis of rotation 220A of cleaning medium supply 221A.

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 equal to the distance between the two axial ends of the impeller 212A, so as to ensure that the injection angle of the cleaning medium supply member 221A is equal when the two axial ends of the blade 2120A are cleaned, thereby obtaining a better flushing effect.

Of course, in the second example of the present application, as shown in fig. 21 and 22, the nozzle 2212A in the cleaning medium supply 221A may also extend obliquely outward from the first end 22111A of the moving part 2211A; for example, the angle between the jetting direction of the nozzle 2212A and the tangential direction of the moving portion 2211A at the first end 22111A may be equal to 45 ° to reduce the angle between the moving portion 2211A and the nozzle 2212A while shortening the jetting distance, reduce the loss of hydraulic power at the corner, and improve the flushing effect. It will be appreciated that in this example of the present application, the equivalent axis of rotation of cleaning medium supply 221A is parallel to axis of rotation 220A of cleaning medium supply 221A.

It should be noted that, as shown in fig. 19 and 21, the volute 211A of the fan main body 21A is provided with a relief hole 2110A, the rotation axis 220A of the cleaning medium supply 221A is located outside the volute 211A, and the moving portion 2211A of the cleaning medium supply 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 to form a penetrating portion. Thus, when it is desired to clean the impeller 212A, the moving portion 2211A of the cleaning medium supply 221A is rotated about the rotation axis 220A to drive the nozzle 2212A to spray the cleaning medium to the vane 2120A through the relief hole 2110A extending into the volute 211A; and the nozzle 2212A oscillates about the rotation axis 220A (i.e., reciprocates within a certain angular range about the rotation axis 220A) after passing through the relief hole 2110A, so that the spray zone reciprocates between the axial ends of the impeller 212A, thereby achieving the global cleaning of the impeller 212A; when the impeller 212A is not required to be cleaned, the moving portion 2211A of the cleaning medium supply 221A is rotated around the rotation axis 220A to drive the nozzle 2212A to exit the volute 211A through the yielding hole 2110A, so as to avoid the nozzle 2212A from being blocked by the oil stain in the volute 211A.

It will be appreciated that, just because the nozzle 2212A in the cleaning medium supply 221A is tilted outwards, the cleaning medium supply 221A can ensure that the entire cleaning of the impeller 212A is achieved by the nozzle 2212A starting to spray the cleaning medium after screwing into the volute 211A via the relief hole 2110A, in the case that the rotation axis 220A is disposed outside the volute 211A; when the nozzle extends in the circumferential direction, the included angle between the injection direction of the nozzle and the axial direction of the impeller is necessarily smaller than 90 ° and gradually decreases after the nozzle is screwed into the volute 211A, so that not only is the impact force loss greater, but also the nozzle 2212A needs to inject the cleaning medium before being screwed into the volute 211A through the relief hole 2110A, so that the impeller 212A cannot be cleaned in the circumferential direction, but also the impeller 212A cannot be cleaned in the circumferential direction before the nozzle is screwed into the volute 211A through the relief hole 2110A, in order to prevent the oil smoke from leaking out of the relief hole 2110A, the relief hole 2110A is usually provided with a sealing door.

Alternatively, as shown in fig. 18, 19 and 21, the cleaning device 22A further includes a driving mechanism 222A fixed to the scroll casing 211A and a rotation seat 223A drivingly connected to the driving mechanism 222A, the rotation seat 223A includes a rotation shaft 2231A providing the rotation axis 220A and a connection arm 2232A extending outwardly from an outer peripheral wall of the rotation shaft 2231A, the rotation shaft 2231 is coaxially connected to a power output end of the driving mechanism 222A, and an end of the connection arm 2232A is fixedly connected to a moving portion 2211A of the cleaning medium supply member 221A. In this way, the connecting arm 2232A can support the moving portion 2211A and the nozzle 2212A away from the rotation axis 220A, so that the opening position of the yielding 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 yielding hole 2110A, prevent the driving mechanism 222A from being polluted by oil dirt leaking from the yielding hole 2110A, and help to prolong the service life of the driving mechanism 222A. It will be appreciated that in other examples of the present application, the drive mechanism 222A may be secured to the housing 10A, yet be capable of driving the cleaning medium supply 221A in a swinging motion outside the volute 211A; alternatively, the cleaning medium supply 221A of the present application may be rotatably disposed in the housing 10A, which will not be described herein.

Alternatively, as shown in fig. 19 and 21, the end of the connecting arm 2232A is fixedly connected to the second end 22112A of the moving portion 2211A, so that a sufficient distance is reserved between the nozzle 2212A and the connecting arm 2232A, so that the swing angle range of the nozzle 2212A is widened and structural interference between the connecting arm 2232A and the volute 211A is avoided under the condition that a smaller yielding hole 2110A is formed.

Alternatively, as shown in fig. 19 and 21, the relief hole 2110A is located on the outer peripheral annular wall of the scroll 211A at a position adjacent to the air intake of the blower body 21A so as to be distant from the center plate position of the impeller 212A. It will be appreciated that, according to the airflow distribution and the oil stain distribution in the volute 211A, the oil stain is the most at the middle disc position of the impeller 212A, and the oil stain at the position adjacent to the air inlet of the fan main body 21A on the peripheral annular wall of the volute 211A is smaller, which helps to reduce the influence of the oil stain on the opening of the yielding hole 2110A.

Alternatively, as shown in fig. 19 and 21, the moving part 2211A has a hollow passage 22110A communicating with the nozzle 2212A, and the hollow passage 22110A of the moving part 2211A is used for conveying the cleaning medium to the nozzle 2212A for the nozzle 2212A to spray the cleaning medium to clean the impeller 212A. It is appreciated that the second end 22112A of the moving portion 2211A may be connected to a water tank or a steam generator through a hose, such that a cleaning medium (such as a liquid medium or a gaseous medium) is supplied to the nozzle 2212A through the hollow passage 22110A, which is not described herein.

Alternatively, the moving portion 2211A may be implemented as a circular arc-shaped rigid tube so as to reduce the opening size of the yielding hole 2110A as much as possible while stably supporting the nozzle 2212A; for example, the moving part 2211A may be, but not limited to, a hollow tube made of a hard material such as plastic, metal, or a high molecular material.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. Self-cleaning formula fan, its characterized in that includes:

a cleaning device including a cleaning medium supply member rotatably provided with respect to the scroll casing, a rotation axis of the cleaning medium supply member being perpendicular to a central axis of the impeller, and a long distance ratio x between a jet angle difference y of the cleaning medium supply member when cleaning both axial ends of the vane and an axial length and an equivalent axial distance of the vane to be cleaned satisfying a relation: y is less than or equal to-0.184 x ² -2.6392x+76.359; wherein the equivalent axial distance is the distance between the intersection of the injection lines of the cleaning medium supply member at the time of cleaning both axial ends of the blade and the blade being cleaned.

2. The self-cleaning fan according to claim 1, wherein the cleaning medium supply member has a difference y in injection angle of 45 ° or less at both axial ends of the blade.

3. The self-cleaning fan of claim 1, wherein the cleaning medium supply members have an equal spray angle when cleaning both axial ends of the blade.

4. A self-cleaning blower according to any one of claims 1-3, wherein the cleaning medium supply member includes a moving portion extending in a circumferential direction of the rotation axis and a nozzle that is tilted outward from a first end of the moving portion, an angle between a jet line of the nozzle and a first end tangent of the moving portion being greater than 0 ° and equal to or less than 90 °.

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

6. The self-cleaning fan of claim 5, wherein the perpendicular projection of the axis of rotation of the cleaning medium supply 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, wherein a relief hole is formed in the volute of the fan main body, a rotation axis of the cleaning medium supply member is located outside the volute, and the moving portion is rotated around the rotation axis to drive the nozzle to enter and exit the volute through the relief hole.

8. The self-cleaning blower of claim 7, wherein the cleaning apparatus further comprises a drive mechanism secured to the volute and a rotating mount drivingly connected to the drive mechanism, the rotating mount comprising a rotating shaft providing the axis of rotation and a connecting arm extending outwardly from a peripheral wall of the rotating shaft, the rotating shaft being coaxially connected to a power output end of the drive mechanism, a distal end of the connecting arm being fixedly connected to a second end of the moving portion of the cleaning medium supply.

9. The self-cleaning fan of claim 8, wherein the relief aperture is located on the peripheral annular wall of the volute adjacent the air intake of the fan body.

10. The self-cleaning blower of claim 4, wherein the moving portion has a hollow passage in communication with the nozzle, the hollow passage of the moving portion for delivering cleaning medium to the nozzle.

11. The range hood, its characterized in that includes:

a housing; and

the self-cleaning blower of any one of claims 1-10, a blower body of the self-cleaning blower being disposed within the housing.