CN219711906U

CN219711906U - Self-cleaning fan and range hood

Info

Publication number: CN219711906U
Application number: CN202222903997.4U
Authority: CN
Inventors: 韩国强; 王发银; 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: 2023-09-19
Anticipated expiration: 2032-10-28
Also published as: CN116066420A; CN116066424A; CN218862950U; CN114033755A; CN116066418A; CN116066422A; CN116066419A; CN116066421A; CN116066423A; CN218862951U

Abstract

The utility model relates to a self-cleaning fan and a range hood, wherein the self-cleaning fan comprises a self-cleaning fan main body and a cleaning device, the fan main body comprises a volute and an impeller rotatably arranged in the volute, the volute is provided with an air outlet and a yielding hole, the volute is provided with a backflow area positioned at one side of the air outlet, and the yielding hole is arranged in the backflow area of the volute; the cleaning device comprises a cleaning medium supply part which is rotatably arranged relative to the volute, the rotation axis of the cleaning medium supply part is positioned outside the volute, the cleaning medium supply part comprises a penetrating part which can extend into the volute through the abdication hole, and in a cleaning state, the penetrating part is configured to jet the cleaning medium to the impeller. The pressure difference between the reflux area of the volute and the outside is small, so that the pressure leakage in the volute from the yielding hole can be reduced, and the influence on the performance of the fan is reduced; meanwhile, the overflow amount of the oil smoke can be reduced, and the service life of the self-cleaning fan is prolonged.

Description

Self-cleaning fan and range hood

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

In the self-cleaning process of the range hood, in order to cover the whole width of the blades as much as possible, the nozzle needs to be arranged into a dynamic rotating structure, and the width of the blades can be completely covered by water jet through rotation during cleaning, so that the whole range cleaning is realized, and therefore, holes are needed on the surface of a volute of a fan system to enable the nozzle to enter the volute.

However, since the fan system is a core power component of the range hood, when the fan is in a working state, for example, in a range hood process, pressure exists in the volute. Therefore, the oil fume carried by the air flow can flow towards the direction of the opening, on one hand, the pressure in the volute can be leaked, and the performance of the fan is influenced; on the other hand, the spilled oil smoke can pollute the nozzle moving assembly at the position, so that the service life of the moving assembly is shortened, the nozzle is polluted when serious, the water outlet of the nozzle is blocked, and the self-cleaning system is caused to be failed.

Disclosure of Invention

Accordingly, it is necessary to provide a self-cleaning fan and a range hood, which can reduce the influence of pressure leakage in a volute on the fan performance, the structure of a nozzle and the like, and prolong the service life of the self-cleaning fan.

The utility model provides a self-cleaning fan, comprising: the fan main body comprises a volute and an impeller rotatably arranged in the volute, the volute is provided with an air outlet and a yielding hole, the volute is provided with a backflow area positioned at one side of the air outlet, and the yielding hole is formed in the backflow area of the volute; and the cleaning device comprises a cleaning medium supply part which is rotatably arranged relative to the volute, the rotation axis of the cleaning medium supply part is positioned outside the volute, the cleaning medium supply part comprises a penetrating part which can extend into the volute through the yielding hole, and in a cleaning state, the penetrating part is configured to jet the cleaning medium to the impeller.

In the self-cleaning fan, the abdication hole is formed in the backflow area of the volute, the airflow discharged by the impeller in the backflow area can pass through the backflow area in a smaller section, the flow speed of the airflow is high, the dynamic pressure in the backflow area is high, the static pressure is small, the section through which the airflow passes is expanded along with the flowing of the airflow to the air outlet, the flow speed of the airflow is reduced, the dynamic pressure is converted into the static pressure, and the static pressure is gradually increased. Therefore, the pressure difference between the reflux area of the volute and the outside is smaller, so that the pressure leakage in the volute from the yielding hole can be reduced, the influence on the performance of the fan is reduced, and the pneumatic noise is reduced; meanwhile, the overflow amount of the oil smoke can be reduced, the pollution of the oil smoke to the inner wall of the reflux area of the volute, the cleaning medium supply part and the yielding hole is reduced, and the service life of the self-cleaning fan is prolonged.

In one embodiment, the backflow area is an area with a central angle theta between 0 ° and 130 ° on the annular wall of the volute, with the rotation axis of the impeller as a center line.

By the arrangement, the static pressure of the backflow area is smaller than that of other positions in the circumferential direction, and the yielding hole is formed in the backflow area, so that the leakage of the pressure inside the volute is smaller.

In one embodiment, the relief hole is open in a region of the volute where the ring center angle θ is between 20 ° and 90 °.

So set up, when not increasing the occupation space of self-cleaning formula fan in range hood, can also guarantee that belt cleaning device can not interfere with the lateral wall of air outlet each other.

In one embodiment, the plane of motion of the cleaning medium supply is parallel to a tangential plane to the outer contour of the impeller.

The cleaning device can enlarge the area of the blade directly washed by the cleaning medium, the travel of the cleaning medium supply part 2 is short, the distance between the cleaning medium supply part and the impeller is small, and the impact force of the cleaning medium on the impeller is large, so that the cleaning effect of the blade is improved.

In one embodiment, the impeller comprises a plurality of arc-shaped blades which are arranged at intervals along the circumferential direction of the impeller, when the motion plane is tangent to a circle where any blade is positioned, the central angle between the tangent point and one end of the blade far away from the center of the impeller is alpha, the central angle between the two ends of the blade is beta, and the alpha/beta is less than or equal to 1/8.

So set up, guarantee that the efflux can wash the outer fringe of blade to promote the cleaning performance.

In one embodiment, 0.ltoreq.α/β.ltoreq.1/8.

By this arrangement, the area of the blade to which the cleaning medium is directly washed can be enlarged.

In one embodiment, the cleaning device further comprises a housing, a sealing cavity communicated with the yielding hole is formed by surrounding the housing and the outer wall of the volute, and the cleaning medium supply piece is movably arranged in the sealing cavity.

The arrangement is that the pressure in the sealing cavity is balanced relatively with the pressure in the volute, and convection is less, so that oil smoke in the volute can be reduced and overflowed into the sealing cavity through the abdicating hole.

In one embodiment, when the penetrating part extends into the volute, a distance between the penetrating part and an outer contour of the impeller is 10mm to 15mm.

So set up, when guaranteeing that cleaning medium supply piece can not interfere each other with the impeller, avoid increasing from clean holistic volume of formula fan.

In one embodiment, the cleaning device further comprises a blocking member disposed in the relief hole, and the blocking member is configured to block the relief hole after the penetrating portion exits the relief hole.

So set up, the shutoff piece can further reduce the oil smoke in the spiral case and pass through the abdication Kong Waiyi.

The utility model also provides a range hood, which comprises the self-cleaning fan.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present utility model, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following descriptions are only some embodiments of the present utility model, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

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

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 utility model;

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

fig. 11 is a flowchart of the overall cleaning of the range hood according to embodiment 1 of the present utility model (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 utility model;

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 utility model;

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 utility model;

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 utility model;

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 utility model;

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 utility model;

FIG. 18 is a schematic view of a self-cleaning blower according to a preferred embodiment of the utility model;

FIG. 19 is an enlarged view of the structure A in FIG. 18 according to the preferred embodiment of the present utility model;

FIG. 20 is a schematic view of a self-cleaning blower according to the preferred embodiment of the utility model;

FIG. 21 is an enlarged view of the structure B in FIG. 20 according to the preferred embodiment of the present utility model;

fig. 22 is a schematic structural view of the scroll casing according to the above preferred embodiment of the present utility model.

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; 10A, a fan main body; 11A, a volute; 111A, air outlet; 112A, relief holes; 113A, a reflow zone; 114A, volute tongue; 12A, an impeller; 121A, blades; 121a, a first position; 121b, a second position; 121c, a third position; 20A, a cleaning device; 21A, a cleaning medium supply; 211A, a penetrating portion; 22A, a housing; 23A, sealing the cavity; 30A, a shell.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and the like are used in the description of the present application for the purpose of illustration only and do not represent the only embodiment.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" on a second feature may be that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through intermedial media. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is less level than the second feature.

Unless defined otherwise, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used in the description of the present application 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 utility model. 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 utility model, 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 utility model 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=htan θt, i.e

Thus, the first and second substrates are bonded together,

wherein, the point A at the injection area of the cleaning medium to the impeller 22 is defined as being injected from the point A0 at the outlet 302 of the penetrating part 30; omega is the rotation speed of the penetrating part 30; θ is the rotation angle of the penetrating portion 30; h is the minimum distance of the rotation center of the point A0 at the outlet 302 of the penetrating portion 30 from the vane 221 ejected by the point a at the ejection area; v0 is the moving speed of the point a at the injection region.

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, wherein Δ=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, recording ta with ω=f (θ), 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, acquiring phi, recording tc, and entering S305;

s305, judging whether the phi value meets the following conditions: phi is greater than or equal to phi 0, if yes, entering S306, if no, entering 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;

phi 0 is the maximum oil stain representation value allowed under the normal state, and in the embodiment, the value is preferably 20-100% (humidity);

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 utility model 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 utility model. 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 utility model 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 to be noted that in the above embodiments 1 to 3 of the present application, both the cleaning medium supply member 3 (3 ') and the impeller 21 are rotated with respect to the scroll 21 of the blower 2, so that the cleaning medium injected from the cleaning medium supply member 3 (3') moves between both axial ends of the impeller 22 in the cleaning region formed at the impeller 22 to effect cleaning of the entire impeller. However, on the one hand, if the rotation speed of the impeller 22 is too high, the cleaning medium injected from the cleaning medium supply member 3 (3') will be blocked by the outer edge of the blade 221 and cannot be injected to the side to be cleaned of the blade 221; if the rotation speed of the impeller 22 is too slow, the time required to clean all the blades 221 is long, and the cleaning efficiency is seriously deteriorated. On the other hand, if the rotational speed of the cleaning medium supply member 3 (3') is too high, the axial movement speed of the cleaning region formed at the impeller 22 is then too high, so that gaps will exist between the adjacent cleaning regions on each blade 221, and the overall cleaning cannot be achieved; if the rotational speed of the cleaning medium supply member 3 (3') is too slow, the axial movement speed of the cleaning region formed at the impeller 22 is too slow, which results in that the adjacent cleaning regions on each blade 221 are severely overlapped to consume a large amount of cleaning medium, resulting in waste of water resources.

Therefore, in order to achieve a better cleaning effect while saving water resources, the design of the rotational speed or angular velocity relationship between the cleaning medium supply member 3 (3 ') and the impeller 22 according to the present application is particularly important, that is, how to design the velocity (including angular velocity and rotational speed) relationship between the cleaning medium supply member 3 (3') and the impeller 22 is a key to achieving a better cleaning effect using a limited cleaning medium.

In particular, according to another aspect of the present application, as shown in fig. 18 to 22, a preferred embodiment of the present application provides a range hood, which may include a housing 30A and a self-cleaning blower mounted to the housing 30A for exhausting the oil smoke. The self-cleaning fan can reduce the influence of leakage of pressure in the volute on the fan performance, the nozzle and other structures by reasonably selecting the opening positions of the abdicating holes, and prolong the service life of the self-cleaning fan. It will be appreciated that the range hood of the present application may also include, but is not limited to, a water tank, a steam generator, a water receiving box and/or sensors to assist in achieving the range hood function, and the present application will not be described in detail herein.

As shown in fig. 18 and 20, more specifically, the self-cleaning fan comprises a fan body 10A and a cleaning device 20A, the fan body 10A comprises a volute 11A and an impeller 12A rotatably disposed in the volute 11A, the volute 11A is provided with an air outlet 111A and a relief hole 112A, the volute 11A has a backflow area 113A located at one side of the air outlet 111A, and the relief hole 112A is opened in the backflow area 113A of the volute 11A; the cleaning device 20A includes a cleaning medium supply member 21A rotatably provided with respect to the scroll 11A, the rotation axis of the cleaning medium supply member 21A being located outside the scroll 11A, the cleaning medium supply member 21A including a penetration portion 211A capable of penetrating into the scroll 11A through the relief hole 112A, and the penetration portion 211A being configured to eject the cleaning medium toward the impeller 12A in a cleaning state. The cleaning medium mentioned in the present application may be steam, liquid water or aqueous solution, etc., and the present application will not be described herein.

As described above, when the fan is in a working state, for example, in the process of exhausting oil smoke, the oil smoke carried by the air flow can flow towards the direction of the opening due to the pressure in the volute, and the performance of the fan can be affected by the pressure leakage in the volute, so that pneumatic noise is generated; the spilled oil smoke aggravates the pollution of the inner cavity of the volute, and also contaminates other structures such as a nozzle and the like, thereby causing the fault of the self-cleaning system. In the self-cleaning fan provided by the preferred embodiment of the present utility model, the relief hole 112A is formed in the backflow area 113A of the volute 11A, the impeller 12A includes a plurality of blades 121A spaced along the circumferential direction of the impeller 12A, and in the backflow area 113A, the impeller 12A is closer to the inner wall of the volute 11A than other positions in the circumferential direction, so that the airflow discharged from the impeller 12A in the backflow area 113A passes through a smaller section, the airflow velocity is high, the dynamic pressure in the backflow area 113A is high, the static pressure is small, and as the airflow flows toward the air outlet 111A, the distance between the impeller 12A and the inner wall of the volute 11A increases gradually, the section through which the airflow passes expands, the airflow velocity decreases, the dynamic pressure is converted into the static pressure, and the static pressure increases gradually. In this way, the pressure difference between the backflow area 113A of the volute 11A and the outside is smaller than that between other areas of the volute 11A and the outside, so that the pressure leakage in the volute 11A from the yielding hole 112A can be reduced, the influence on the performance of the fan is reduced, and the pneumatic noise is reduced; meanwhile, the overflow amount of the oil smoke can be reduced, the pollution of the oil smoke to the inner wall of the backflow area 113A of the volute 11A, the cleaning medium supply piece 21A and the yielding hole 112A is reduced, and the service life of the self-cleaning fan is prolonged.

The side wall of the air outlet 111A of the volute 11A protrudes from the annular wall of the volute 11A, a volute tongue 114A is formed between the side wall of the air outlet 111A and the annular wall, and the backflow area 113A is located at one side of the volute tongue 114A away from the air outlet 111A.

As shown in fig. 22, the center of rotation of the impeller 12A is used as the center, a line passing through the center and tangent to the volute tongue 114A is used as a 0 ° datum line, a backflow region 113A is defined as a region with a central angle θ between 0 ° and 130 ° on the annular wall of the volute 11A, a relief hole 112A is formed in the backflow region 113A with the central angle θ between 0 ° and 130 ° on the annular wall of the volute 11A, static pressure in the region is smaller than static pressure at other positions in the circumferential direction, and leakage of pressure in the volute 11A is small when the relief hole 112A is formed in the backflow region 113A. The relief holes 112A can be arranged at will according to actual requirements along the axial direction of the volute 11, and the circumferential direction of the volute 11A extends from the volute tongue 114A of the volute 11A to the air outlet 111A, so that the flow speed of circumferential air flow is smaller and smaller, and the static pressure is larger and larger, i.e. the annular wall of the volute 11A is in a diffusion state from 0 degrees to 290 degrees.

Since the side wall of the air outlet 111A is provided protruding from the annular wall of the scroll casing 11A toward the 20 ° direction, the cleaning device 20A also needs to be provided protruding from the scroll casing 11A. Therefore, the relief hole 112A is preferably formed in the 20 ° to 90 ° area of the annular wall of the volute 11A, so that the occupied space of the self-cleaning fan in the range hood is not increased, the overall size of the range hood is not increased, and the cleaning device 20A is not interfered with the side wall of the air outlet 111A.

In the illustrated embodiment, the air outlet 111A is provided in a region of the annular wall of the scroll casing 11A having a central angle of between 290 ° and 0 °. Of course, in other embodiments, the size and the arrangement position of the air outlet 111A may be changed as required, for example, the air outlet 111A is disposed in a region with a central angle between 310 ° and 0 ° or a region between 330 ° and 0 ° on the annular wall of the volute 11A, and the like, which is not particularly limited herein.

As shown in fig. 19, the movement plane x of the cleaning medium supply member 21A is parallel to a tangential plane to the outer contour of the impeller 12A. I.e. the rotation axis of the cleaning medium supply member 21A is perpendicular to the tangential non-plane of the outer contour of the impeller 12A. The movement plane x of the cleaning medium supply member 21A is a plane perpendicular to the rotation axis of the cleaning medium supply member 21A, and is a jet axis of the cleaning medium supply member 21A. Compared with the case that the movement plane x of the cleaning medium supply member 21A coincides with or intersects with the tangential plane of the outer contour of the impeller 12A, the area of the blade 121A directly flushed by the cleaning medium, that is, the area of the injection area can be increased when the two surfaces are parallel, and the stroke of the cleaning medium supply member 21A required to move when the cleaning medium supply member 21A is sufficiently cleaned to both sides of the impeller 12A is short, and in the cleaning process, the distance between the penetrating portion 211A of the cleaning medium supply member 21A and the impeller 12A is small, and the impact force of the cleaning medium on the impeller 12A is large, thereby improving the cleaning effect of the blade 121A.

As shown in fig. 18 to 19, the impeller 12A includes a plurality of arc-shaped blades 121A uniformly spaced along the circumferential direction of the impeller 12A, when the movement plane x is tangent to a circle in which any one of the blades 121A is located, a central angle between a tangent point and one end of the blade 121A away from the center of the impeller 12A is α, one end of the blade 121A away from the center of the impeller 12A is one end of the blade 121A at the outer edge, a central angle between two ends of the blade 121A is β, and two ends of the blade 121A are one end of the blade 121A at the outer edge and one end of the blade 121A at the inner edge. When the impeller 12A rotates in the counterclockwise direction as shown in fig. 18, the position of the vane 121A, where the circle is tangent to the movement plane x, is defined as a first position 121A, the position of the vane 121A located on one side of the first position 121A in the counterclockwise direction is defined as a second position 121b, and the position of the vane 121A located on one side of the first position 121A in the clockwise direction is defined as a third position 121c. Since the impeller 12A is rotatable, the blades 121A in the first position 121A may be any of the blades 121A, not limited to the blades 121A shown by the impeller 12A in the illustrated position.

When the movement plane x is tangential to the circle in which the vane 121A is located in the first position 121A, the cleaning medium can just flush to the vane 121A located in the third position 121A; the impeller 12A continues to rotate, and when the vane 121A located at the third position 121A gradually rotates to the first position 121A, the flushing of the vane 121A is completed, and the cleaning medium can be flushed to the next vane 121A located at the third position 121A.

When alpha is less than or equal to 0 DEG, the movement plane x can be tangent to one end of the blade 121A positioned at the first position 121A far away from the center of the impeller 12A, namely, the movement plane x is tangent to the outer edge of the blade 121A positioned at the first position 121A, so that the outer edge of the blade 121A can be sufficiently cleaned, and the cleaning dead angle of the blade 121A is reduced. Because the jet flow of the cleaning medium has certain diffusion, in the actual cleaning process, the jet flow of the cleaning medium is not in a line, so that the jet flow can be ensured to be cleaned to the outer edge of the blade 121A as long as the position of the movement plane x on the volute 11A is less than or equal to 1/8 so as to promote the cleaning effect.

Meanwhile, in order to enlarge the area of the ejection area of the vane 121A, it is also necessary to control the distance h between the tangential plane y of the circle in which the vane 121A is located at the second position 121b, which is parallel to the movement plane x, and the movement plane x as large as possible. It will be appreciated that as the positions of the cleaning medium supply member 21A and the relief hole 112A gradually move downward, h gradually increases, and α/β gradually increases, as shown in fig. 19. Therefore, in order to achieve the optimum cleaning effect of the vane 121A, the position of the movement plane x on the scroll casing 11A needs to satisfy 0.ltoreq.α/β.ltoreq.1/8, so that the position of the relief hole 112A can be determined.

As shown in fig. 18 and 20, the cleaning device 20A further includes a housing 22A, a seal chamber 23A communicating with the relief hole 112A is formed around the housing 22A and the outer wall of the scroll 11A, the cleaning medium supply member 21A is movably disposed in the seal chamber 23A, and the penetrating portion 211A can extend into the scroll 11A through the relief hole 112A. The housing 22A may be formed by enclosing a bracket of the self-cleaning fan and a bracket of the cleaning device 20A, or may be a bracket of an independent self-cleaning fan, and the bracket of the cleaning device 20A is fixed on an inner wall of the bracket of the self-cleaning fan. Wherein, two supports can be through screw, buckle isotructure fixed connection. The cleaning device 20A further includes a motor disposed in the seal chamber 23A for driving the cleaning medium supply member 21A. The casing 22A can make the whole inside sealed chamber 23A and spiral case 11A be in sealed state, and is not linked together with the external world, like this, the inside pressure of sealed chamber 23A is balanced with the inside pressure of spiral case 11A relatively, and the convection is few to can reduce the oil smoke in spiral case 11A and overflow to sealed chamber 23A through letting down hole 112A in, further reduce the pollution of oil smoke to belt cleaning device 20A and letting down hole 112A.

The distance between the cleaning medium supply member 21A and the inner wall of the seal chamber 23A during the movement is about 5mm, and the increase of the volume of the housing 22A is avoided while ensuring that the cleaning medium supply member 21A does not interfere with the inner wall of the seal chamber 23A. As shown in fig. 21, when the penetrating portion 211A extends into the volute 11A through the relief hole 112A, the distance between the penetrating portion 211A and the wall of the relief hole 112A is 3mm to 5mm, so that the penetrating portion 211A is prevented from interfering with the wall of the relief hole 112A, and meanwhile, a large amount of oil smoke in the volute 11A is prevented from overflowing into the seal cavity 23A due to the overlarge aperture of the relief hole 112A. When the penetrating portion 211A extends into the volute 11A, the distance between the penetrating portion 211A and the outer contour of the impeller 12A is 10mm to 15mm, so that the cleaning medium supply member 21A is prevented from interfering with the impeller 12A, and the whole volume of the self-cleaning fan is prevented from being increased. Meanwhile, when the penetrating portion 211A extends into the scroll casing 11A, it is also necessary to ensure that the entire vane 121A can be cleaned while ensuring that the penetrating portion does not interfere with the inner wall of the scroll casing 11A, particularly at both axial end positions of the vane 121A. The actual installation position and size of the cleaning medium supply member 21A may be determined according to the sizes of the scroll casing 11A, the housing 22A, and the motor, etc., as long as it is ensured that the cleaning medium supply member 21A does not interfere with other structures when moving.

The cleaning device 20A further includes a blocking member (not shown) disposed in the relief hole 112A, where the blocking member is configured to block the relief hole 112A after the penetrating portion 211A exits the relief hole 112A. The closure member can further reduce the escape of oil smoke in the volute 11A into the seal chamber 23A through the relief aperture 112A, while also avoiding deformation of the housing 22A due to resistance to pressure in the volute 11A. In one embodiment, the plugging member is configured as a deformable elastic member, and the middle area of the elastic member is provided with an opening, such as a tooth-shaped discontinuous connection structure or a cross-shaped structure, and when no external force is applied to the elastic member, the opening is in a closed state, and when the penetrating portion 211A rotates into the volute 11A, the opening of the elastic member can be pushed open, and when the penetrating portion 211A rotates away from the volute 11A, the elastic member can be restored to the open state. The outer edge of the elastic member is wider to increase the contact area between the elastic member and the spiral case 11A, and the inner edge of the elastic member is narrower to enable the opening to be easily deformed, so that the problem that the wearing portion 211A cannot pass through the elastic member due to overlarge resistance of the elastic member to the wearing portion 211A is avoided.

In another embodiment, the plugging member may be a rotatable cover body disposed on an inner wall of the volute 11A, the cover body may cover the relief hole 112A, an elastic member is disposed between the cover body and the volute 11A, when the penetrating portion 211A rotates into the volute 11A, the cover body may be pushed open, the relief hole 112A is opened, and when the penetrating portion 211A rotates away from the volute 11A, the cover body may rotate under the action of the elastic member to close the relief hole 112A. Of course, in other embodiments, the blocking member may be configured in other structures, as long as it can ensure that the relief hole 112A is blocked after the penetrating portion 211A exits the relief hole 112A, and the present invention is not limited thereto.

As shown in fig. 18, the present utility model further provides a range hood, which includes the self-cleaning fan. The range hood comprises a shell 30A, and a self-cleaning fan is arranged in the shell 30A.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described 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 above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the claims. 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 utility model, which are all within the scope of the utility model. Accordingly, the scope of the utility model should be determined from the following claims.

Claims

1. A self-cleaning fan, comprising:

the fan main body (10A) comprises a volute (11A) and an impeller (12A) rotatably arranged in the volute (11A), wherein the volute (11A) is provided with an air outlet (111A) and a yielding hole (112A), the volute (11A) is provided with a backflow area (113A) positioned at one side of the air outlet (111A), and the yielding hole (112A) is formed in the backflow area (113A) of the volute (11A); and

The cleaning device (20A) comprises a cleaning medium supply part (21A) rotatably arranged relative to the volute (11A), wherein the rotation axis of the cleaning medium supply part (21A) is positioned outside the volute (11A), the cleaning medium supply part (21A) comprises a penetrating part (211A) capable of penetrating into the volute (11A) through the yielding hole (112A), and the penetrating part (211A) is configured to jet cleaning medium to the impeller (12A) in a cleaning state.

2. The self-cleaning fan according to claim 1, characterized in that the recirculation zone (113A) is a zone on the annular wall of the volute (11A) having a central angle θ of between 0 ° and 130 ° with the rotation axis of the impeller (12A) as a center line.

3. Self-cleaning fan according to claim 2, characterized in that the relief hole (112A) is open in the region of the annular wall of the volute (11A) with a central angle between 20 ° and 90 °.

4. Self-cleaning fan according to claim 1, characterized in that the plane of movement of the cleaning medium supply (21A) is parallel to the tangential plane to the outer contour of the impeller (12A).

5. The self-cleaning fan according to claim 4, wherein the impeller (12A) comprises a plurality of arc-shaped blades (121A) which are arranged at intervals along the circumferential direction of the impeller (12A), when the movement plane is tangential to a circle where any one of the blades (121A) is located, a central angle between a tangential point and one end of the blade (121A) which is far from the center of the impeller (12A) is alpha, and a central angle between two ends of the blade (121A) is beta, so that alpha/beta is less than or equal to 1/8.

6. The self-cleaning fan of claim 5, wherein 0.ltoreq.α/β.ltoreq.1/8.

7. The self-cleaning fan according to claim 1, wherein the cleaning device (20A) further comprises a housing (22A), a seal cavity (23A) communicated with the relief hole (112A) is formed by surrounding the housing (22A) and the outer wall of the volute (11A), and the cleaning medium supply member (21A) is movably arranged in the seal cavity (23A).

8. The self-cleaning fan according to claim 1, characterized in that when the penetrating portion (211A) extends into the volute (11A), a distance between the penetrating portion (211A) and an outer contour of the impeller (12A) is 10mm to 15mm.

9. The self-cleaning fan according to claim 1, wherein the cleaning device (20A) further comprises a blocking member disposed in the relief hole (112A), the blocking member being configured to block the relief hole (112A) after the penetrating portion (211A) exits the relief hole (112A).

10. A range hood comprising a self-cleaning blower as claimed in any one of claims 1 to 9.