CN116066419A

CN116066419A - Fan cleaning device for range hood and range hood

Info

Publication number: CN116066419A
Application number: CN202211336162.3A
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: CN116066421A; CN218862950U; CN114033755A; CN116066424A; CN116066418A; CN116066420A; CN116066422A; CN218862951U; CN219711906U; CN116066423A

Abstract

The invention provides a fan cleaning device for a range hood and the fan cleaning device for the range hood, which is not changed to the range hood, comprising: the fan comprises an impeller, wherein a plurality of blades are circumferentially arranged on the impeller, each blade is provided with an inner side surface, and the inner side surfaces are concave curved surfaces; and a cleaning medium supply having an outlet for spraying a cleaning medium to the inner side of the blade to form a spray zone on the inner side of the blade and a flush zone between the spray zone and the bottom point of the blade; wherein, the arc length S1 of the spraying area and the arc length S2 of the flushing area satisfy the relation: S1/S2 is more than or equal to 0.2 and less than or equal to 1.525, so as to improve the effect of cleaning the blade.

Description

Fan cleaning device for range hood 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 invention relates to the technical field of kitchen equipment, in particular to a fan cleaning device for a range hood and the range hood.

Background

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

However, in the rotation process of the impeller, dynamic pressures, namely air flow speeds, applied to various position points on the blades of the impeller are different, so that the degree of oil dirt aggregation on the blades is not uniform. In general, the greater the airflow rate contacted. On the premise of a certain oil smoke concentration, the more the airflow speed on the blade is, the more the oil stains are contacted, so that the more the oil stains are adhered at the position. In particular to the vanes, the more oil is adhered to the area of the vanes closer to the outlet.

On the other hand, because of better oil smoke extraction, a non-straight sheet-shaped blade is usually selected on the impeller. However, the position of the blade directly washed to the blade through the outlet is only a part of the area on the blade when the blade is washed, so that a washing blind area exists in the washing of the blade, and how to effectively improve the efficiency of oil stains on the blade becomes a difficult problem in the field of cleaning of the range hood.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a blower cleaning device for a range hood and a range hood to improve the efficiency of removing oil stains on the blades.

The invention provides a fan cleaning device for a range hood, which comprises:

the fan comprises an impeller, wherein a plurality of blades are circumferentially arranged on the impeller, each blade is provided with an inner side surface, and the inner side surfaces are concave curved surfaces; and

a cleaning medium supply having an outlet for injecting a cleaning medium onto the inner side of the blade to form an injection zone on the inner side of the blade and a flush zone between the injection zone and the bottom point of the blade;

wherein, the arc length S1 of the spraying area and the arc length S2 of the flushing area satisfy the relation: S1/S2 is more than or equal to 0.2 and less than or equal to 1.525.

When the cleaning medium supply piece cleans the blade, the relation between the arc length of the spraying area and the arc length of the flushing area is limited, the ratio of the arc length to the arc length of the flushing area is prevented from being too small, the ratio of the flushing area to the whole blade is prevented from being too large, the ratio of the spraying area is too small, the area of the spraying area, where the cleaning medium sprayed in the outlet is sprayed, is prevented from being too small, and the cleaning effect is deteriorated. When the ratio of the two is too large, a large blind area exists on the blade, and the blade cannot be cleaned, so that the cleaning effect is also poor. Thus, the above ratio ranges are defined by effectively cleaning the blade of oil.

In one embodiment of the invention, the arc length S1 of the spray zone and the arc length S2 of the flushing zone satisfy the relationship: S1/S2 is more than or equal to 0.34 and less than or equal to 0.86.

In one embodiment of the invention, the arc length S1 of the spray zone and the arc length S2 of the flushing zone satisfy the relationship: S1/S2 is more than or equal to 0.34 and less than or equal to 0.5.

In one embodiment of the invention, the arc length of the blade is S, satisfying: (S1+S2)/S is more than or equal to 0.46 and less than or equal to 1.

In one embodiment of the invention, the cleaning medium supply member has a spray line, a tangent line of the highest point of the maximum circular track formed by rotation of the blade is a datum line, and a distance between the spray line and the datum line is a cleaning surface height H of the cleaning medium supply member, so that 0.69cm < H < 11.95cm is satisfied.

In one embodiment of the invention, the inner side surface of the blade is a concave arc surface.

In one embodiment of the invention, the minimum distance between the outlet and the blade being cleaned is L1, and 20 mm.ltoreq.L1.ltoreq.250 mm is satisfied.

In one embodiment of the invention, the cleaning medium supply has an operating state in which the inner side of the blade being cleaned is rotated in a direction approaching the outlet.

In one embodiment of the invention, the fan comprises a volute positioned outside the impeller, a yielding hole for the outlet to pass through is formed in the volute, and the cleaning medium supply piece is arranged in the volute;

the cleaning medium supply piece comprises a penetrating part which can extend into the volute, the outlet is formed in the penetrating part, the penetrating part penetrates through the yielding hole and moves relative to the volute, and in the working state of the cleaning medium supply piece, cleaning medium sprayed out of the outlet moves between two axial end parts of the impeller.

In one embodiment of the invention, in the operating state, the inner side of the blade being cleaned is turned in a direction towards the outlet.

In one embodiment of the invention, the penetration is curved in the operating state.

In one embodiment of the invention, the penetrating portion performs a swinging motion.

The first technical problem to be solved by the invention is to provide a fan cleaning device for a range hood, which can realize a full-coverage efficient cleaning function, aiming at the current state of the art.

The second technical problem to be solved by the invention is to provide a fan cleaning device for a range hood, which can avoid the blockage of a cleaning medium supply part.

The third technical problem to be solved by the invention is to provide a fan cleaning device for a range hood, which occupies a small space, aiming at the current state of the art.

The invention aims to provide a fan cleaning device for a range hood, which has the advantages of small improvement on the original structure of a fan and no influence on the performance of the fan.

The fifth technical problem to be solved by the invention is to provide the fan cleaning device for the range hood, which can ensure that the cleaning time of each position of the impeller is consistent.

The sixth technical problem to be solved by the invention is to provide a range hood with the fan cleaning device.

The seventh technical problem to be solved by the invention is to provide a control method of the fan cleaning device, which can fully clean the impeller and save energy consumption.

The technical scheme adopted by the invention for solving the first and second technical problems is as follows: a fan belt cleaning device for range hood, including the fan, this fan is including the spiral case and locate the impeller in the spiral case, its characterized in that: the volute is provided with a relief hole;

and also include

The cleaning medium supply part is provided with a penetrating part which can extend into the volute, and an outlet for the cleaning medium to be ejected is arranged on the penetrating part; and

the power output end of the driving device is in transmission connection with the penetrating part and is used for driving the penetrating part to pass through the yielding hole to move relative to the volute, so that the penetrating part has at least two states:

in the working state, the outlet of the penetrating part extends into the volute and faces the impeller, and the cleaning medium ejected from the outlet of the penetrating part moves between two axial end parts of the impeller towards the ejection area at the impeller;

in the non-working state, the outlet of the penetrating part exits the volute.

In order to further solve the third and fourth technical problems, at least the movement track of the end of the penetrating portion far from the outlet is in a nonlinear shape, so that the minimum distance between the end of the penetrating portion far from the outlet and the volute is smaller than the length of the penetrating portion in a state that the outlet of the penetrating portion moves to the yielding hole. Thus, the cleaning medium supply member can cover a wide cleaning range in a small movable space.

Specifically, the first scheme is: in the working state, the whole penetrating part makes curvilinear motion.

In order to make the movable space occupied by the cleaning medium supply member small enough, the whole penetrating part performs swinging motion.

In order to avoid interference between the penetrating part and the volute in the rotating process, the part of the penetrating part penetrating through the abdicating hole in the moving process is an arc section, and the circle center of the arc section is positioned on the rotating axis of the penetrating part.

In order to realize the driving of the cleaning medium supply part by the driving device, the cleaning medium supply part is in transmission connection with the power output end of the driving device through a rotating seat, and the rotating seat comprises

The rotating shaft is coaxially connected to the power output end of the driving device; and

and the connecting arm is connected with the outer peripheral wall of the rotating shaft at a first end and connected with the cleaning medium supply part at a second end.

Alternatively, the cleaning medium supply member is in transmission connection with the power output end of the driving device through a first transmission assembly, and the first transmission assembly comprises

A first rack arranged at a first side of the cleaning medium supply member in an extending direction of the cleaning medium supply member;

the first gear is coaxially connected to the power output end of the driving device and meshed with the first rack; and

The elastic limiting block is positioned on the second side of the cleaning medium supply piece, so that the cleaning medium supply piece is clamped between the first gear and the elastic limiting block.

In order to uniformly clean the whole impeller according to the distribution quantity of the greasy dirt, the fan is a double air inlet fan, the impeller of the fan is provided with a middle disc, and when the spraying area corresponds to the middle disc, the spraying path from the outlet of the penetrating part to the impeller is shortest.

The scheme II is as follows: the cleaning medium supply part is an elastic part, and the outlet of the cleaning medium supply part moves linearly in the working state. Thus, the linear motion of the outlet can realize the coverage of a larger cleaning range, and the non-linear motion of the penetrating part at one end far away from the outlet can avoid occupying excessive movable space when the penetrating part moves.

In order to drive the cleaning medium supply part by the driving device, the cleaning medium supply part is in transmission connection with the power output end of the driving device through a second transmission assembly, and the second transmission assembly comprises

At least two second racks sequentially arranged on the cleaning medium supply member along the extending direction of the cleaning medium supply member, and adjacent ends of the adjacent two second racks are hinged;

The second gear is coaxially connected to the power output end of the driving device and can be meshed with each second rack; and

the limiting sleeve is internally provided with a bending channel for the cleaning medium supply piece and the second rack to pass through.

The two schemes have small occupied space, the original structure of the fan is improved little (namely, only a yielding hole for the penetrating part to penetrate is needed to be formed in the volute), and the performance of the fan is not affected.

In order to further solve the fifth technical problem, the cleaning medium is directed to the spraying area at the impeller, and the movement of one point A between two axial ends of the impeller is uniform.

In order to realize uniform motion of the injection area, at least two blades extending along the axial direction are arranged on the impeller at intervals along the circumferential direction, and in the working state, the injection area of the cleaning medium, which is shot to the impeller, moves along the length direction of the blades;

and also include

in the non-working state, the outlet of the penetrating part exits the volute.

wherein the point A at the injection area of the cleaning medium to the impeller is defined as the point A at the outlet of the penetrating part ₀ Injecting;

omega is the rotating speed of the penetrating part;

θ is the rotation angle of the penetrating portion;

h is the outlet point A of the penetrating part ₀ A minimum distance of the rotation center of (2) from the blade ejected at point a at the ejection area;

v ₀ The moving speed of the point A at the injection area is delta t, which is the time interval between two adjacent speed changes of the penetrating part.

In order to avoid blocking the air flow in the volute caused by the fact that the air flow in the volute is punched to the outlet of the penetrating portion through the abdicating hole, the penetrating portion is provided with an end face opposite to the abdicating hole in a non-working state, and the outlet of the penetrating portion is positioned on the adjacent side wall of the end face.

In order to facilitate the automatic leading-in of the cleaning medium, the device also comprises a water tank and a steam generator, wherein the water tank is provided with a water inlet end and a water outlet end, the steam generator is provided with a water inlet end and a steam outlet end, and can heat water to generate steam, the water inlet end of the steam generator is communicated with the water outlet end of the water tank through a water pipe, and the steam outlet end of the steam generator is communicated with the inlet of the cleaning medium supply piece through a steam pipe.

In order to facilitate the collection of sewage, the sewage treatment device further comprises a water receiving box with an opening at the top, a drain hole is formed in the bottom of the volute, and the water receiving box is located right below the drain hole.

In order to facilitate regional cleaning of the impeller according to the distribution condition of the oil stains, a sensor for detecting the oil stain quantity is arranged at the position of the cleaning medium supply part close to the outlet.

Preferably, the sensor is a humidity sensor, the cleaned impeller has local oil stain left, after the impeller is thrown away at a high speed, water on the impeller and flowing oil stains on the impeller are thrown away, the metal surface of the impeller is in a dry state, the surface humidity of the impeller is far higher than that of the metal impeller after the oil stains absorb water, and at the moment, the high-water-content oil stains can be detected through the humidity sensor, and the oil stains are positioned.

The technical scheme adopted by the invention for solving the first technical problem can be as follows: a fan belt cleaning device for range hood, including the fan, this fan is including the spiral case and locate the impeller in the spiral case, its characterized in that: a relief hole is formed in the annular wall of the volute;

and also include

the power output end of the driving device is in transmission connection with the penetrating part and is used for driving the penetrating part to pass through the yielding hole to move relative to the volute, so that the penetrating part has a working state:

in the working state, the outlet of the penetrating part extends into the volute and faces the impeller, and the cleaning medium ejected from the outlet of the penetrating part moves between two axial end parts of the impeller towards the ejection area at the impeller.

In order to further solve the second technical problem, the penetrating portion further has a non-working state:

and in a non-working state, the outlet of the penetrating part exits the volute.

The technical scheme adopted by the invention for solving the sixth technical problem is as follows: a range hood with the fan cleaning device comprises a shell, wherein the fan is arranged in the shell.

The technical scheme adopted by the invention for solving the seventh technical problem is as follows: the control method of the fan cleaning device comprises the following steps:

step one, jetting a cleaning medium to a rotating impeller by moving a penetrating part of a cleaning medium supply part, so that a jetting area of the cleaning medium jetted from an outlet of the cleaning medium supply part to the impeller reciprocates between two axial end parts of the impeller, and overall cleaning is carried out on the whole impeller;

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

step three, driving a sensor to move by moving a penetrating part of a cleaning medium supply part, detecting oil stain amount at each position between two axial end parts of an impeller, and collecting an oil-stained area of the impeller;

And fourthly, jetting the cleaning medium to the rotating impeller by moving the penetrating part of the cleaning medium supply part, so that the jetting area of the cleaning medium jetted from the outlet of the cleaning medium supply part to the impeller reciprocates between the two axial end parts of the oil dipping area, and the oil dipping area is cleaned.

In order to ensure that the cleaning time is consistent at each position of the impeller in practical application as far as possible, the smaller the speed change interval of the cleaning medium supply part is, the better the speed change interval is, and two schemes are adopted for the value of the speed change interval:

in the first scheme, the time interval between two adjacent speed changes of the penetrating part is deltat, and the value of deltat is 1-100 ms.

In the second scheme, the rotation angle interval between two adjacent speed changes of the penetrating part is delta theta, and the value of delta theta is 0.1-1 degrees.

In the third aspect, the driving source of the penetrating portion is a stepper motor, the interval between two adjacent variable-speed steps of the stepper motor is Δn, and the value of Δn is 1-200.

In principle, since the purpose of the scheme is to ensure that the cleaning time is consistent at each position of the impeller, the time is taken as a speed change interval to be more suitable; of course, in the case where the driving source is a stepping motor, it is simpler to take the number of steps as the shift interval.

In order to correct the step difference, the third step and the fourth step are realized by the following methods: step three, in the process of rotating the sensor, recording the rotating angle thetan of the penetrating part when the sensor collects the oil dipping area each time; and step four, rotating the penetrating part to a corresponding rotation angle theta 'n for region cleaning, wherein theta' n=thetan+delta theta ', delta theta' is an included angle between a penetrating part cleaning medium injection path and a sensor detection medium injection path.

In order to ensure the sampling accuracy, the time interval between two adjacent samples of the sensor in the third step is deltat ', and the value of deltat' is 1-100 ms.

In order to ensure that the cleaning effect of the cleaning medium is exerted to the maximum extent, the four steps are realized by the following method: firstly, sorting the 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.

In order to match the requirements of different steps, the rotating speed of the impeller in the first step is 10-200 r/min, and the rotating speed of the impeller in the second step is 1500-3000 r/min.

In order to facilitate self-cleaning prompt to customers, the self-cleaning prompt is carried out before the first step by the following method: judging whether the time from the last cleaning to the present exceeds the allowable maximum cleaning interval time D in the normal state, judging whether the time from the last cleaning to the present exceeds the allowable maximum accumulated use time H in the normal state, and if the two conditions are met at the same time, lighting a self-cleaning prompt.

In order to adopt proper cleaning frequency, the value of D is 1-180 days, and the value of H is 1-180 hours.

Compared with the prior art, the invention has the advantages that:

(1) The penetrating part of the cleaning medium supply piece is driven by the driving device to move relative to the volute, so that the penetrating part has at least two states: in the working state, the outlet of the penetrating part extends into the volute and faces the impeller, and the cleaning medium ejected from the outlet of the penetrating part moves between two axial end parts of the impeller towards the ejection area of the impeller, so that the full-coverage efficient cleaning of the impeller is realized; in a non-working state, the outlet of the penetrating part exits the volute, so that the outlet of the penetrating part is prevented from being blocked;

(2) The penetrating part is penetrated on the yielding hole of the volute, and the motion track of the penetrating part at least at one end far away from the outlet is in a nonlinear shape, so that the minimum distance between one end of the penetrating part far away from the outlet and the volute is smaller than the length of the penetrating part when the outlet of the penetrating part moves to the yielding hole; therefore, the penetrating part can cover a larger cleaning range in a smaller movable space, on one hand, the occupied space is small, and on the other hand, the original structure of the fan is improved little, and the performance of the fan is not affected. Wherein, the point A at the injection area of the cleaning medium to the impeller is defined as being injected from the point A0 at the outlet of the penetrating part;

Omega is the rotating speed of the penetrating part;

θ is the rotation angle of the penetrating portion;

h is the minimum distance of the rotation center of the point A0 at the outlet of the penetrating part from the blade sprayed by the point A at the spraying area;

v0 is the moving speed of the point a at the injection region.

and also include

Compared with the prior art, the invention has the advantages that:

(2) The penetrating part is penetrated on the yielding hole of the volute, and the motion track of the penetrating part at least at one end far away from the outlet is in a nonlinear shape, so that the minimum distance between one end of the penetrating part far away from the outlet and the volute is smaller than the length of the penetrating part when the outlet of the penetrating part moves to the yielding hole; therefore, the penetrating part can cover a larger cleaning range in a smaller movable space, on one hand, the occupied space is small, and on the other hand, the original structure of the fan is improved little, and the performance of the fan is not affected.

Drawings

FIG. 1 is a graph showing the distribution of blade pressure in different areas of throwing force and oil pollution;

fig. 2 is a schematic cross-sectional view of embodiment 1 of the range hood of the present invention;

FIG. 3 is a schematic illustration of the mating relationship of the impeller and the cleaning medium ejected from the outlet in accordance with the present invention;

FIG. 4 is an enlarged schematic view of portion F of FIG. 3;

FIG. 5 is a schematic representation of the relationship between three regions on a single blade in the present invention.

FIGS. 6A-6F are schematic diagrams showing the relationship between the spray area, the flush area, and the blind zone at different cleaning surface heights;

FIGS. 7A-7F are schematic illustrations of the cleaning effect of the impeller at different cleaning surface heights;

fig. 8 is a schematic diagram of the overall structure of the range hood;

fig. 9 is a schematic perspective view of fig. 8 with the housing omitted (cleaning medium supply member in an initial position);

fig. 10 is a longitudinal sectional view of fig. 9, after omitting the water tank, the steam generator and the water receiving box;

FIG. 11 is a left side view of FIG. 10 with the volute and drive omitted;

FIG. 12 is a left side view of the cleaning medium supply member of FIG. 9 rotated to an intermediate position;

FIG. 13 is a left side view of the cleaning medium supply member of FIG. 9 rotated to an end position;

FIG. 14 is a left side view of the cleaning medium supply member rotated to a center plate position with the blower of FIG. 9 being a dual air intake blower;

FIG. 15 is a schematic view of the relative position of the cleaning medium supply member of FIG. 10 with respect to the blades during rotation;

Fig. 16 is a flow chart of a self-cleaning prompt of the range hood in embodiment 1 of the present invention;

fig. 17 is a flowchart of the overall cleaning of the range hood according to embodiment 1 of the present invention (taking time as sampling interval);

fig. 18 is a flowchart of the overall cleaning of the range hood according to embodiment 1 of the present invention (the number of steps is taken as the sampling interval);

fig. 19 is a flowchart of oil-soaking area collection of the range hood according to embodiment 1 of the present invention;

fig. 20 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. 21 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. 22 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. 23 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. 24 is a longitudinal sectional view of the blower, the cleaning medium supply member, and the driving device in the operating state in embodiment 4 of the range hood of the present invention.

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; 2211. a spray zone; 2212. flushing the area; 2213. a dead zone; 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.

Detailed Description

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

It is noted that when an element is referred to as being "mounted on" another element, it can be directly mounted 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.

The range hood is a device for pumping out the oil smoke harmful to human body generated during cooking by the impeller 22 rotating at high speed. After the range hood is used for a period of time, oil stains can gather on the blades 221 of the impeller 22 in a large amount, and the normal operation of the range hood is affected.

During actual rotation of impeller 22, dynamic pressure applied to each point on blades 221 of impeller 22 is different, i.e., the air flow velocity at each point on blades 221 is also different. The greater the airflow velocity means the greater the airflow rate contacted at that location of the vane 221. Assuming that the concentration of soot is constant, the greater the airflow velocity, the more greasy dirt will be contacted and thus the more greasy dirt will adhere to the vane 221.

In addition, because the straight blades have poor air discharge capacity, the air quantity and the air pressure of the kitchen ventilator are usually smaller under the same rotating speed and size conditions, and therefore, the kitchen ventilator usually adopts non-straight blades, such as curved blades or arc-shaped blades and the like. For curved blades, there may be a dead zone 2213, so that the dead zone 2213 on the blade is not cleaned all the time, and the cleaning effect may be poor.

Since the blades 221 on the impeller 22 are uniformly and alternately distributed along the circumferential direction of the impeller 22, the movement locus of each blade 221 on the impeller 22 is the same. For convenience of description and understanding, when the description of the blades 221 is made later, description is made with respect to one of the blades 221 (i.e., the currently cleaned blade), and it is defined that the axial direction in which the driving member 23 drives the impeller 22 to rotate is the axial direction of the blade 221, that is, the length direction of the blade 221 is the axial direction of the blade 221. And defines one end of the air flow inlet as the bottom end of the vane 221, referring to point b shown in fig. 4, and one end of the air flow outlet 302 as the top end of the vane 221, referring to point a in fig. 4.

Referring to fig. 1-5, fig. 1 is a graph of the throwing force and oil contamination of the blade 221 pressure in different areas. The blade 221 shown in fig. 2 to 5 is circular arc-shaped, and in contrast to fig. 1 and 5, the change in the throwing-off force of the blade 221 from the air inlet side (right side in fig. 1, bottom end in fig. 5) to the air outlet 302 side (left side in fig. 1, top end in fig. 5) is known that the throwing-off force from the air inlet side to the air outlet 302 side becomes gradually smaller, so that the oil dirt closer to the air outlet 302 side is harder to be thrown off from the blade 221. The airflow velocity on the side of the combination blade 221 close to the airflow outlet 302 is greater than the airflow velocity on the inlet side, so that the grease dirt on the top end of the blade 221 close to the bottom end of the blade 221 generally assumes a gradually decreasing state.

In order to improve the efficiency of removing the greasy dirt from the blade 221, the present invention provides a fan cleaning device, and refer to fig. 1 to 24. The fan cleaning device comprises a fan 2 and a cleaning medium supply member 3, wherein the cleaning medium supply member 3 is provided with an outlet 302, and the outlet 302 is used for spraying the cleaning medium to the blades 221 so as to effectively remove oil stains on the blades 221 of the fan. The fan cleaning device can be applied to products such as a range hood and the like.

Specifically, the fan 2 is disposed in the housing 1, and the fan 2 includes a volute 21, an impeller 22 disposed in the volute 21, and a driving member 23 for driving the impeller 22 to rotate. A plurality of axially extending blades 221 are circumferentially spaced apart from the impeller 22. The driving member 23 may drive the impeller 22 to move in a first direction or a second direction, the first direction being opposite to the second direction. For ease of understanding and description, rotation of impeller 22 in a first direction may be understood as rotation of impeller 22 in a counter-clockwise direction, and rotation of impeller 22 in a second direction may be understood as rotation of impeller 22 in a clockwise direction.

In order to increase the impact force of the cleaning medium sprayed onto the blades 221 when the impeller 22 is cleaned, the inner surfaces of the cleaned blades are rotated toward the outlet 302 (i.e., the impeller 22 is rotated counterclockwise as shown in fig. 2), so that the cleaning effect is improved. In the following description, explanation will be given taking an example in which the blades 221 of the impeller 22 are rotated in a direction approaching the outlet 302 in a state of washing the impeller.

As shown in fig. 2 to 5, for convenience in describing the structure and shape of the blades 221, the blades 221 are defined to have inner and outer sides, and in adjacent two blades 221, the inner side of one blade 221 is disposed at a distance corresponding to the outer side of the other blade 221 to form an air flow passage between the two adjacent blades 221.

Specifically, the vane 221 in the present invention has an inner side surface that is concave to form a concave curved surface, and further, the concave curved surface of the vane 221 is a concave arc surface. The outlet 302 of the cleaning medium supply member 3 is disposed toward the inner side of the vane 221 for injecting the cleaning medium through the outlet 302 to the inner side of the vane 221, and forms an injection area 2211 and a flushing area 2212 between the injection area 2211 and the bottom point of the vane 221 on the inner side of the vane 221 to clean the oil stain of the inner side of the vane 221.

Here, the injection area 2211 of the blade 221 refers to an area formed once contacting the inner side surface of the blade 221 after the cleaning medium is injected from the outlet 302, and the injection area 2211 does not include an area formed after the cleaning medium flows along the blade 221 or drops from the blade 221 after being injected onto the blade 221. The flushing area 2212 of the vane 221 is an area where the cleaning medium flows along the inner side surface of the vane 221 from the injection area 2211 after being injected into the injection area 2211. After being sprayed to the spraying area 2211 on the blade 221, the cleaning medium directly cleans the oil stain on the spraying area 2211 by using the impact force. The cleaning medium on the spraying area 2211 flows to the flushing area 2212 to carry away the oil stain on the flushing area 2212 in a liquid flow mode, so that the purpose of cleaning the oil stain on the flushing area 2212 is achieved. It should be noted that the shape of the spraying area 2211 is related to the structure and shape of the outlet 302 and the movement of the outlet 302, and the present invention is not limited to the shape of the spraying area 2211.

Referring to fig. 3 and 4, the cleaning medium supply member 3 has an ejection line X1, that is, the cleaning medium ejected through the outlet 302 is ejected along the ejection line X1. In other words, the cleaning medium sprayed through the outlet 302 is sprayed along the direction of the outlet 302, and the axis along which the direction of the outlet 302 is located is the spraying line X1. For example, the outlet 302 of the cleaning medium supply member 3 is oriented horizontally, and the ejection line X1 is a horizontal ejection line. The outlet 302 of the cleaning medium supply member 3 is oriented obliquely with respect to the horizontal plane, and the spray line X1 is an oblique spray line with respect to the horizontal plane.

The maximum trajectory profile when the impeller 22 rotates is circular, and a tangent line defining the highest point of the maximum circular trajectory is a reference line. The cleaning medium supply member has a cleaning surface height H, which is the distance between the ejection line X1 and the reference line X2. Since the reference line X2 does not change, when the injection line X1 is far or near toward the reference line X2, both the arc length of the injection region injected to the inner side surface of the blade through the outlet 302 and the positional relationship of the injection region with respect to the blade in the radial direction are affected.

Since the inner side of the vane 221 in the embodiment of the present invention is a curved surface, when the outlet 302 sprays the cleaning medium toward the inner side of the vane 221, due to the self-structural limitation between the vanes 221 of the impeller 22, the adjacent vanes 221 have overlapping on the cross section, so that the cleaning medium can only fall onto a partial area on the vane 221, i.e. the formed spraying area 2211 when the cleaning medium sprays toward the vane 221. While a flushing blind zone 2213 is formed between the top end of the blade 221 and the injection zone 2211, and a flushing zone 2212 is formed between the bottom end of the blade 221 and the injection zone 2211. Here, the blind area 2213 refers to an area located between the injection area 2211 and the tip of the vane 221, which cannot be directly washed by the washing medium injected from the outlet 302, nor can the washing medium wash the area along the inner side surface of the vane 221. Specifically, referring to fig. 4, when the cleaned blade 221a moves to the dotted line position, the injection line X1 intersects with the vertex a of the blade 221a and extends to the point d of the blade 221a, and at this time, the area where the point a and the point d on the blade 221a are located is the dead zone 2213. The arc length between ads is the arc length S3 of the blind area 2213. Since the above-described axial direction is along the length of the blade, the arc length of the ejection area, the arc length of the flushing area, and the arc length of the dead zone can be understood as the arc length along the radial direction of the blade.

Further, in order to facilitate understanding of the manner in which the spray region 2211 is formed, a specific circular arc-shaped blade will be exemplified hereinafter. It will be appreciated that for other shapes of the vanes 221, reference may be made to this to determine the formation of the spray zone 2211. Specifically, impeller 22 rotates counterclockwise during the cleaning process, and the cleaning medium ejected from outlet 302 can be ejected toward blades 221 of impeller 22. Taking one of the blades 221 as an example, when the impeller 22 rotates one turn, the cleaning medium ejected from the outlet 302 is ejected to a partial area on the blade 221 to form an ejection area 2211. That is, the spray area 2211 is formed as a spray area of the cleaning medium from a start position where the spray onto the blade is started to a finish position where the spray onto the blade 221 is ended, and the spray area 2211 may also be called an impact area.

In order to more reasonably define the relationship among the blind area 2213, the injection area 2211 and the flushing area 2212, the arc length of the blade 221 is defined as S, and the arc length of the blind area 2213 is defined as S3, then s=s1+s2+s3. From the top to bottom direction of the vane 221, the vane 221 is divided into three regions, namely a dead zone 2213, an injection region 2211, and a flushing region 2212, in this order. To improve the efficiency of cleaning the inner side of the blade 221, the present invention aims to improve the cleaning of the blade 221 by limiting the range of the ratio between the arc length of the spray area 2211 and the arc length of the wash area 2212 on the blade 221. Specifically, the outlet 302 is disposed toward the vane 221, for injecting the cleaning medium to the inner side surface of the vane 221 to form an injection region 2211 and a flushing region 2212 adjacent to the injection region 2211 on the inner side surface of the vane 221, defining an arc length S1 of the injection region 2211, an arc length S2 of the flushing region 2212, the arc length of the injection region 2211 and the arc length of the flushing region 2212 satisfy the relationship 0.2+.s1/s2+.1.525, and the arc length of the dead zone 2213 satisfies the relationship: S3/S is more than or equal to 0 and less than or equal to 0.54. It should be noted that, the arc length of the spraying area 2211 refers to the arc length corresponding to the area of the blade 221 where the flushing area 2212 is located on the blade 221 along the direction (which can be understood as radial direction) from the top to the bottom of the blade 221. Similarly, the arc length of the flushing area 2212 refers to the arc length of the blade 221 corresponding to the area of the blade 221 where the flushing area 2212 is located, along the direction from the top to the bottom of the blade 221. Similarly, the arc length of the blind area 2213 herein refers to the arc length of the blade 221 corresponding to the area of the blind area 2213 located on the blade 221 along the direction from the top to the bottom of the blade 221.

The relationship between the arc length of the spray area 2211 and the arc length of the flushing area 2212 (0.2.ltoreq.S 1/S2.ltoreq.1.525 as described above) is defined in order to improve the efficiency of the cleaning medium supply 3 for cleaning the greasy dirt on the blade 221. Too small a ratio of the two is avoided, resulting in too large a ratio of the arc length of the flushing area 2212 to the blade 221, so that the arc length of the spraying area 2211 is too small, resulting in smaller spraying of the cleaning medium sprayed in the outlet 302 to the area of the spraying area 2211, and thus poor cleaning effect. When the ratio of the two is too large, the outlet 302 has a blind area 2213 when being sprayed onto the vane 221, and when the ratio of the two is too large, the outlet 302 has a large blind area 2213, which also deteriorates the cleaning effect of the outlet 302.

To further optimize the cleaning effect, the ratio of the arc length of the spray zone 2211 to the arc length of the flush zone 2212 satisfies 0.34S 1/S2 0.86, the arc length of the blind zone 2213 satisfies the relationship: S3/S0.12-0.42, to further increase the ratio of the spraying area S1 to the flushing area S2, to increase the area of the cleaning medium sprayed from the outlet to the inner side of the blade, and to reduce the ratio of the dead zone, to further increase the cleaning effect.

Further, the relationship between the two satisfies: when S1/S2 is more than or equal to 0.34 and less than or equal to 0.5, the arc length of the blind area 2213 meets the relation: S3/S0.12-0.25 to further increase the ratio of the spraying area S1 to the flushing area S2, to increase the area of the cleaning medium sprayed from the outlet to the inner side of the blade, and to reduce the ratio of the dead zone to further increase the cleaning effect.

In the cleaning of the blade 221, in order to avoid the dead zone 2213 from excessively increasing in the duty ratio, 0.46.ltoreq.S1+S2)/S.ltoreq.1, that is, 0.46.ltoreq.S-S3)/S.ltoreq.1 is satisfied. In other words, when (s1+s2)/s=0.46, the ratio of the arc length S3 representing the dead zone 2213 to the arc length of the vane 221 is 0.54, that is, S3/s=0.54. When (s1+s2)/s=1, the arc length S3 of the blind area 2213 is zero, so that the cleaning effect is prevented from being deteriorated due to an excessively large ratio of the arc length of the blind area 2213 to the arc length of the blade 221.

To explain and understand the effects defined above, the outlet 302 is provided toward the inner side surface of the impeller 22 for injecting the cleaning medium, and the trajectory of the cleaning medium injection of the cleaning medium toward the impeller 22 is set to be linear. It should be understood by those skilled in the relevant art that the cleaning medium continuously sprayed through the outlet 302 is of a columnar structure, and for simplicity of explanation, the trajectory of the cleaning medium sprayed through the outlet 302 will be indicated by any one straight line in the columnar shape.

Referring to fig. 6A to 7F, the change between the ratio of the arc length of the spraying area 2211 to the arc length of the flushing area 2212 and the cleaning effect of the corresponding blade (in this embodiment, the arc length of the first blade is 11.11 cm) are provided for an impeller according to the present invention corresponding to different cleaning surface heights. The cleaning effect corresponding to the cleaning surface height in fig. 6A corresponds to fig. 7A, and so on. It should be noted that, in fig. 7A to 7F, each of the figures illustrates the cleaning of the same blade (reference numeral 200 indicates oil stain) in different states, wherein one blade 221a represents the state of the oil stain 200 before cleaning the blade, and the other blade 221a' represents the state of the oil stain 200 on the blade after cleaning the blade.

Specifically, referring to fig. 7A to 7F, when the cleaning surface height H is 15, fig. 7F shows the comparison of the oil stains on the blade of the impeller before and after cleaning, as can be seen from fig. 7F in combination with fig. 6F, the oil stains on the spraying area and the flushing area are cleaned relatively clean, while the oil stains on the dead area are hardly cleaned (as can be seen from fig. 7F, when the accumulated oil stains are higher than a certain thickness, the spraying line needs to clean the oil stains with a higher thickness on the dead area before impacting on the spraying area), wherein the ratio of the cleaned area (the sum of the arc length of the spraying area and the arc length of the flushing area) to the arc length of the whole blade is 0.37, and the ratio of the uncleaned area (i.e. the arc length of the dead area) to the arc length of the whole blade is 0.63, and the ratio of the dead area to the blade is too large, so that more oil stains remain on the blade, and the cleaning effect is poor.

Fig. 7A shows the comparison of the oil stains on the blade of the impeller before and after cleaning when the cleaning surface height H is 11.95cm, and as can be seen from fig. 7A in combination with fig. 6A, the oil stains on the spraying area and the flushing area are cleaned, while the oil stains on the dead area are not cleaned, wherein the ratio of the area cleaned (the sum of the arc length of the spraying area and the arc length of the flushing area) to the arc length of the whole blade is 0.46, and the ratio of the arc length of the area not cleaned (i.e. the arc length of the dead area) to the arc length of the whole blade is 0.54. When the cleaning surface height H is 15, it is found that the dead zone is reduced, and more regions on the inner surface of the blade are cleaned, thereby improving the cleaning effect.

Similarly, fig. 7B shows that when the cleaning surface height H is 8, the oil stains on the spraying area and the flushing area are cleaned more cleanly, but the oil stains on the dead zone are not cleaned, wherein the ratio of the cleaned area (the sum of the arc length of the spraying area and the arc length of the flushing area) to the arc length of the whole blade is 0.68, and the ratio of the arc length of the unwashed area (and the dead zone) to the arc length of the whole blade is 0.42, compared with the cleaning surface height H of 11.95, the dead zone is further reduced, more areas on the inner side surface of the blade are cleaned, and the cleaning effect is further improved.

Similarly, fig. 7C shows that when the cleaning surface height H is 4, the oil stains on the spraying area and the flushing area are cleaned relatively cleanly, but the oil stains on the dead zone are not cleaned, wherein the ratio of the cleaned area (the sum of the arc length of the spraying area and the arc length of the flushing area) to the arc length of the whole blade is up to 0.75, and the ratio of the arc length of the unwashed area (and the dead zone) to the arc length of the whole blade is 0.25, compared with the cleaning surface height H of 8, the dead zone is further reduced, and more areas on the inner side surface of the blade are cleaned, thereby further improving the cleaning effect.

Similarly, fig. 7D shows that when the cleaning surface height H is 2, the oil stains on the spraying area and the flushing area are cleaned relatively cleanly, but the oil stains on the dead zone are not cleaned, wherein the ratio of the cleaned area (the sum of the arc length of the spraying area and the arc length of the flushing area) to the arc length of the whole blade reaches 0.88, and the ratio of the arc length of the unwashed area (and the dead zone) to the arc length of the whole blade is 0.12, compared with the cleaning surface height H of 4, the dead zone is further reduced, and more areas on the inner side surface of the blade are cleaned, thereby further improving the cleaning effect.

Similarly, fig. 7E shows that when the cleaning surface height H is 0.69, the dead zone is zero, and the whole blade is cleaned more cleanly, so that a better cleaning effect is achieved.

Referring to the following table, the ratio of each area on the blade 221 at different cleaning surface heights corresponding to fig. 6A to 6F is shown in the following table:

list one

As can be seen from table one and fig. 7A to 7F, when the cleaning surface height H of the cleaning medium supply member is too large, the duty ratio of the cleaning dead zone 2213 is too large, so that most of the area on the blade cannot be cleaned, and the cleaning effect is poor. When the cleaning surface height H is too small, the ratio of the flushing area 2212 is too large, and the ratio of the spraying area 2211 is too small, so that the cleaning effect is poor. Specifically, as can be seen from the cleaning effect, when the cleaning surface height H of the cleaning medium supply member satisfies: when H is more than or equal to 0.69cm and less than or equal to 11.95cm, the cleaning effect is better, and when H is more than or equal to 15cm, the dead zone ratio is too large, so that the cleaning effect is obviously deteriorated.

In order to avoid too large or too small a distance between the outlet 302 and the impeller 22, in the present invention, the minimum distance between the outlet 302 and the washed blade 221 is L1, and satisfies: 20 mm.ltoreq.L.ltoreq.250 mm to avoid gradual dispersion of the cleaning medium sprayed onto the blades 221 through the outlet 302 due to ambient air. The cleaning effect is deteriorated because the dispersed water flow causes the drop of the impact force, and the water column sprayed from the outlet 302 is prevented from being dispersed by limiting the range of L to prevent the drop of the impact force, thereby improving the cleaning effect. It is understood that the minimum distance L1 between the outlet 302 and the cleaned blade 221 here refers to the distance when the cleaned blade 221 is closest to the outlet 302. Referring to fig. 2 and 4, when the washed blade 221a moves to the dotted line position, the outlet 302 is spaced from the point a of the washed blade 221 a.

It should be noted that, for the process of forming the injection area 2211 in the present invention, the simulation can be performed by using a laser. For example, the position of the outlet 302 is replaced with a laser emitter, and as the impeller rotates, the laser emitted thereby strikes the area formed on the cleaned blade, and the spray area 2211 referred to herein is understood. For the same blade, the lowest point of the laser emitted by the laser emitter on the blade is the point c in fig. 4, and the highest point of the laser emitted by the laser emitter on the inner side surface of the blade is the highest point on the blade is the point d in fig. 4.

In order to clean the blade in the axial direction (longitudinal direction), the present invention will hereinafter also be described in terms of a manner in which the penetrating portion 30 is movable to clean the blade in the axial direction.

Specifically, as shown in fig. 2 to 14, a first preferred embodiment of the range hood according to the present invention is shown. 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 cleaning medium ejected from the outlet 302 of the penetrating part 30 is ejected to the ejection area 2211 at the blades 221 to reciprocate 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 "spraying region 2211" refers to a region where the cleaning medium is formed once contacting the vane 221 of the impeller 22 after being sprayed from the outlet 302, and does not include a region where the cleaning medium flows along the vane 221 after being sprayed onto the vane 221 or is formed after being dropped from the vane 221. The shape and size of the injection area 2211 are related to the structure and shape of the outlet 302 itself and the movement mode of the penetrating portion 30, and the present invention is not limited to the shape and size of the injection area 2211, but only the injection area 2211 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. 10, 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 2211 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 overlapped 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 2211 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 2211 covers only a narrow annular surface of the outer periphery 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 the present 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 2211 of the cleaning medium emitted from the outlet 302 of the penetrating portion 30 towards 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 track of the injection area 2211 is completely parallel to the central axis of the impeller 22, and when the motion track 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 area 2211 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. 14, it is verified through experiments that, for the impeller with double air intake (the impeller 22 has the middle plate 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 plate 222, based on the above phenomenon, in this embodiment, the cleaning medium supply member 3 is disposed close to the middle plate 222 when being disposed, so that when the spraying area 2211 corresponds to the middle plate 222 (i.e. the spraying area 2211 moves to the position where the blade 221 passes through the middle plate 222), the spraying path from the outlet 302 of the penetrating portion 30 to the impeller 22 is shortest, and under the same spraying condition, the shorter the spraying path, the larger the spraying 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 at the injection area 2211 of the impeller 22 along the axial direction between the two axial ends of the impeller 22 is set to be uniform motion, and the motion of the penetrating portion 30 is set to be variable speed motion, and the derivation formula is as follows:

as shown in fig. 15, 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 2211 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 at the point a at the ejection area 2211;

v0 is the speed of movement of point a at the spray zone 2211.

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 2211 of the steam axially reciprocates between the front end part and the rear end part of the impeller 22, and overall cleaning is performed on the whole impeller 22:

(1) As shown in fig. 11, 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. 12, 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 spraying area 2211 is slowly moved toward the front end;

(3) as shown in fig. 13, when the spray area 2211 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 2211 returns to the rearmost end of the vane 221, the driving device 4 switches the rotation direction again, and the above-mentioned movement is repeated;

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. 16, the above range hood performs self-cleaning prompt before self-cleaning by the following method:

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, cleaning medium is sprayed to the rotating impeller 22 by moving the cleaning medium supply member 3 so that the spraying area 2211 of the cleaning medium reciprocates in the axial direction between the front end portion and the rear end portion of the impeller 22, and global cleaning is performed on the whole impeller 22;

Specifically, as shown in fig. 17, 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 2211 is positioned at the forefront end of the impeller 22, and is preferably 30 to 75 °;

Δt is the time interval between two adjacent shifts of the driving device 4, and the smaller the value is, the more can be ensured that the cleaning medium is shot to the injection area 2211 at the impeller 22, and the reciprocating motion along the axial direction between the two axial end parts of one point A impeller 22 at the axial direction is uniform motion, 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. 18, 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. 19, 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, 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, the more the spraying area 2211 of the cleaning medium to one point a in the impeller 22 can be guaranteed to reciprocate axially to a uniform motion between two axial ends of the impeller 22, 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 2211 of the cleaning medium moves back and forth in the axial direction between the front end portion and the rear end portion of the oil-impregnated area, thereby performing area cleaning on the oil-impregnated area.

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 of three consecutive oil dipping points, and finally to implement accurate cleaning in reverse order, because the more the database is counted, the more the description is continuous.

As shown in fig. 20, 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. 20, 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.

As shown in fig. 21 and 22, a third preferred embodiment of the range hood of the present invention is shown. 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. 21, 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 spiral curve motion relative to the scroll 21 so that the outlet 302' of the penetrating portion 30' extends into the scroll 21 and faces the vane 221 of the impeller 22, and as shown in fig. 21, in an operating state, the rotation direction of the driving device 4 is periodically changed, so that the injection region 2211 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.

As shown in fig. 23 and 24, 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 take-off of the drive means 4, can be engaged 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. 23, 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. 23, 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 jetting area 2211 at 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 will be appreciated by persons skilled in the art that the above embodiments have been provided for the purpose of illustrating the invention and are not to be construed as limiting the invention, and that suitable modifications and variations of the above embodiments are within the scope of the invention as claimed.

Claims

1. A fan cleaning device for a range hood, comprising:

the fan (2) comprises an impeller (22), wherein a plurality of blades (221) are circumferentially arranged on the impeller (22), each blade (221) is provided with an inner side surface, and the inner side surfaces are concave curved surfaces; ###

A cleaning medium supply (3) having an outlet (302; 302 '), the outlet (302; 302') for injecting a cleaning medium to an inner side of the blade (221) to form an injection zone (2211) on the inner side of the blade (221) and a flushing zone (2212) between the injection zone (2211) and a bottom point of the blade (221);

wherein, the arc length S1 of the spraying area (2211) and the arc length S2 of the flushing area (2212) satisfy the relation: S1/S2 is more than or equal to 0.2 and less than or equal to 1.525.

2. The fan cleaning device for a range hood according to claim 1, characterized in that the arc length S1 of the injection zone (2212) and the arc length S2 of the flushing zone (2213) satisfy the relation: S1/S2 is more than or equal to 0.34 and less than or equal to 0.86.

3. The fan cleaning apparatus for a range hood according to claim 2, wherein an arc length S1 of the spray area (2212) and an arc length S2 of the flush area satisfy the relationship: S1/S2 is more than or equal to 0.34 and less than or equal to 0.5.

4. The fan cleaning apparatus for a range hood according to claim 1, wherein the arc length of the blade (221) is S, satisfying: (S1+S2)/S is more than or equal to 0.46 and less than or equal to 1.

5. The fan cleaning apparatus for a range hood according to claim 1, wherein the cleaning medium supply member (201) has a spray line, a tangent line of a highest point of a maximum circular locus formed by rotation of the blade (221) is a reference line, and a distance between the spray line and the reference line is a cleaning surface height H of the cleaning medium supply member (3), satisfying 0.69 cm.ltoreq.h.ltoreq.11.95 cm.

6. The fan cleaning apparatus for a range hood according to claim 1, wherein the inner side surface of the vane (221) is a concave arc surface.

7. The fan cleaning apparatus for a range hood according to claim 1, wherein a minimum distance between the outlet (302; 302') and the blade 9221 to be cleaned is L1, and 20 mm.ltoreq.l1.ltoreq.250mm is satisfied.

8. Fan cleaning device for extractor hoods according to any of the claims 1 to 7, characterized in that said fan (22) comprises a volute (21) located outside said impeller (22), said volute (21) being provided with a relief hole (211) for said outlet (301) to pass through, said cleaning medium supply (3) being provided in said volute (21);

the cleaning medium supply (3; 3';3 ") comprises a penetration portion (30; 30'; 30") which can extend into the volute (21), the outlet (301) being provided in the penetration portion (30; 30';30 "), the penetration portion (30; 30'; 30") moving relative to the volute (21) through the relief hole (211) such that the penetration portion (30; 30';30 ") has an operating state in which the outlet (301) of the penetration portion (30; 30'; 30") extends into the volute (201) and towards the impeller (22), and the cleaning medium ejected from the outlet (302; 302';302 ") moves between the two axial ends of the impeller (22) towards the ejection area (2211) at the impeller (22).

9. A fan cleaning device for a range hood according to claim 8, characterized in that in an operating state the inner side of the blade (221) being cleaned is turned in a direction towards the outlet (302; 302';302 ").

10. A fan cleaning apparatus for a range hood according to claim 8, wherein the penetration portion (30; 30') makes a curvilinear movement in an operating state.

11. A fan cleaning device for a range hood according to claim 8, characterized in that the penetration (30; 30') is in a swinging movement.

12. The utility model provides a fan belt cleaning device for range hood, is including fan (2), and this fan (2) are including spiral case (21) and locate impeller (22) in spiral case (21), its characterized in that: the volute (21) is provided with a yielding hole (211);

and also include

A cleaning medium supply (3; 3'; 3') having a penetration (30; 30'; 30') provided with an outlet (302, 302'; 302') for the ejection of the cleaning medium; and

a drive device (4) the power output end of which is connected to the through-arrangement (30; 30';30 ") for driving the penetration (30; 30'; 30") through the relief hole (211) in a movement relative to the volute (21) so that said penetration (30; 30';30 ") has at least two states:

in the operating state, the penetration (30; 30'; 30') extend into said volute (21) and towards said impeller (22), and the cleaning medium ejected from the outlet (302; 302 ') of the through-going portion (30; 30') is directed towards the ejection zone at the impeller (22) to move between the two axial ends of the impeller (22);

In the non-operating state, the outlet (302; 302 ') of the through-going part (30; 30') exits the volute (21).

13. The blower cleaning device for a range hood of claim 12, wherein: the penetration (30; 30'; 30') at least remote from the outlet (302; 302';302 ") is of a non-linear shape, such that the movement path at one end of the through-going portion (30; 30';30 ') is moved to the relief hole (211), the minimum distance between the end of the penetrating portion (30; 30') away from the outlet (302; 302 ') and the volute (21) is smaller than the length of the penetrating portion (30; 30').

14. The blower cleaning device for a range hood of claim 13, wherein: in the operating state, the entire insertion part (30; 30') moves in a curved manner.

15. The blower cleaning device for a range hood of claim 14, wherein: in the working state, the whole penetrating part (30) swings.

16. The blower cleaning device for a range hood of claim 15, wherein: the part of the penetrating part (30) penetrating through the abdication hole (211) in movement is an arc section, and the circle center of the arc section is positioned on the rotation axis of the penetrating part (30; 30';30 ").

17. The blower cleaning device for a range hood of claim 14, wherein: the cleaning medium supply part (3) is in transmission connection with the power output end of the driving device (4) through a rotating seat (31), and the rotating seat (31) comprises

A rotating shaft (311) coaxially connected to the power output end of the driving device (4); and

and a connecting arm (312) having a first end connected to the outer peripheral wall of the rotating shaft (311) and a second end connected to the cleaning medium supply member (3).

18. The blower cleaning device for a range hood of claim 14, wherein: the cleaning medium supply part (3 ') is in transmission connection with the power output end of the driving device (4) through a first transmission assembly (31 '), and the first transmission assembly (31 ') comprises

A first rack (311 ') arranged on a first side of the cleaning medium supply member (3 ') in the extending direction of the cleaning medium supply member (3 ');

a first gear (312 ') coaxially connected to the power output end of the driving device (4) and meshed with the first rack (311'); and

an elastic stopper (313 ') is located at a second side of the cleaning medium supply member (3 ') such that the cleaning medium supply member (3 ') is sandwiched between the first gear (312 ') and the elastic stopper (313 ').

19. The blower cleaning device for a range hood of claim 14, wherein: the fan (2) is a double air inlet fan, the impeller (22) of the fan (2) is provided with a middle disc (222), and when the spraying area corresponds to the middle disc (222), the spraying path from the outlet (302; 302 ') of the penetrating part (30; 30') to the impeller (22) is shortest.

20. The blower cleaning device for a range hood of claim 14, wherein: the cleaning medium supply member (3 ') is an elastic member, and the outlet (302 ') of the penetrating portion (30 ') moves linearly in the operating state.

21. The blower cleaning device for a range hood of claim 20, wherein: the cleaning medium supply (3 ') is in driving connection with the power take-off of the drive device (4) via a second transmission assembly (31 '), which second transmission assembly (31 ') comprises

At least two second racks (311 ') sequentially arranged on the cleaning medium supply member (3') along the extending direction of the cleaning medium supply member (3 ') and adjacent ends of the adjacent two second racks (311') are hinged;

a second gear wheel (312 ') coaxially connected to the power take-off end of the drive device (4) and capable of meshing with each of the second toothed racks (311'); and

The limiting sleeve (313 ') is internally provided with a bending channel (3131') for the cleaning medium supply piece (3 ') and the second rack (311') to pass through.

22. The blower cleaning device for a range hood of claim 12, wherein: the cleaning medium is shot to the injection area of the impeller (22), and the motion of one point A between two axial ends of the impeller (22) is uniform motion.

23. The blower cleaning device for a range hood of claim 22, wherein: at least two blades (221) extending along the axial direction are arranged on the impeller (22) at intervals along the circumferential direction, the penetrating part (30) performs swinging motion in the working state, and the cleaning medium is shot to a spraying area at the impeller (22) to move along the length direction of the blades (221);

wherein the point A at the injection area of the cleaning medium to the impeller (22) is defined as the point A at the outlet (302) of the penetrating part (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 part (30) ₀ A minimum distance of the rotation center of (2) from the blade (221) ejected by the point A at the ejection area;

24. The blower cleaning device for a range hood of claim 12, wherein: in the inactive state, the threading portion (30; 30'; 30') has an end face facing the relief hole (211), the outlet (302; 302 ') of the penetration (30; 30') being located on an adjacent side wall of the end face.

25. The blower cleaning apparatus for a range hood of any one of claims 12-24, wherein: the water tank (5) is provided with a water inlet end and a water outlet end, the steam generator (6) is provided with a water inlet end and a steam outlet end, steam can be generated by heating water, 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 an inlet (301; 301 ') of the cleaning medium supply part (3; 3') through a steam pipe (62).

26. The blower cleaning apparatus for a range hood of any one of claims 12-24, wherein: the water receiving box (7) with the top opening is further arranged, a drain hole (212) is formed in the bottom of the volute (21), and the water receiving box (7) is located under the drain hole (212).

27. The blower cleaning apparatus for a range hood of any one of claims 12-24, wherein: a sensor (8) for detecting the amount of oil dirt is mounted on the cleaning medium supply member (3; 3 ') near the outlet (302; 302').

28. The blower cleaning device for a range hood of claim 27, wherein: the sensor (8) is a humidity sensor.

29. The utility model provides a fan belt cleaning device for range hood, is including fan (2), and this fan (2) are including spiral case (21) and locate impeller (22) in spiral case (21), its characterized in that: a relief hole (211) is formed in the annular wall of the volute (21);

and also include

A cleaning medium supply (3; 3 ') having a penetration (30; 30') which can extend into the volute (21), wherein the penetration (30; 30 ') is provided with an outlet (302; 302') for the cleaning medium to be emitted; and

the power output end of the driving device (4) is in transmission connection with the penetrating part (30; 30 ') and is used for driving the penetrating part (30; 30 ') to move relative to the volute (21) through the yielding hole (211) so as to enable the penetrating part (30; 30 ') to have an operating state:

In the working state, the outlet (302; 302 ') of the penetrating part (30; 30') extends into the volute (21) and faces the impeller (22), and the cleaning medium ejected from the outlet (302; 302 ') of the penetrating part (30; 30') is ejected to the ejection area at the impeller (22) and moves between two axial ends of the impeller (22).

30. The blower cleaning device for a range hood of claim 29, wherein: in the operating state, the entire insertion part (30; 30') moves in a curved manner.

31. The blower cleaning device for a range hood of claim 30, wherein: in the working state, the whole penetrating part (30) swings.

32. The blower cleaning device for a range hood of claim 31, wherein: the part of the penetrating part (30) penetrating through the abdication hole (211) in movement is an arc section, and the circle center of the arc section is positioned on the rotation axis of the penetrating part (30; 30').

33. The blower cleaning device for a range hood of claim 30, wherein: the cleaning medium supply part (3) is in transmission connection with the power output end of the driving device (4) through a rotating seat (31), and the rotating seat (31) comprises

34. The blower cleaning device for a range hood of claim 30, wherein: the cleaning medium supply part (3 ') is in transmission connection with the power output end of the driving device (4) through a first transmission assembly (31 '), and the first transmission assembly (31 ') comprises

35. The blower cleaning device for a range hood of claim 29, wherein: the threading portion (30; 30') also has a non-operative condition:

36. The blower cleaning device for a range hood of claim 35, wherein: in the non-operating state, the penetrating part (30; 30 ') has an end face facing the relief hole (211), and the outlet (302; 302 ') of the penetrating part (30; 30 ') is located on an adjacent side wall of the end face.

37. The blower cleaning apparatus for a range hood of any one of claims 29-36, wherein: a sensor (8) for detecting the amount of oil dirt is arranged at a position of the cleaning medium supply part (3; 3 ') close to the outlet (302; 302').

38. The blower cleaning device for a range hood of claim 37, wherein: the sensor (8) is a humidity sensor.

39. A range hood with a fan cleaning device according to any one of claims 1 to 38, comprising a housing (1), said fan (2) being arranged in the housing (1).