CN216518891U

CN216518891U - Fan cleaning device for range hood and range hood

Info

Publication number: CN216518891U
Application number: CN202122653689.6U
Authority: CN
Inventors: 王发银; 王亚男; 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: 2021-11-01
Publication date: 2022-05-13
Anticipated expiration: 2031-11-01

Abstract

The utility model discloses a fan cleaning device for a range hood, which comprises a fan (2), wherein the fan (2) comprises a volute (21) and an impeller (22) arranged in the volute (21), and is characterized in that: the volute (21) is provided with a yielding hole (211); also comprises a cleaning medium supply piece (3; 3') which is provided with a penetrating part (30) capable of extending into the volute (21); a driving device (4) for driving the cleaning medium supply member (3; 3 ') to move through the abdicating hole (211) relative to the volute (21) so as to make the cleaning medium supply member (3; 3') at least have an operating state and a non-operating state. The utility model also discloses a range hood with the fan cleaning device. Compared with the prior art, the fan cleaning device can realize the full-coverage efficient cleaning function and can avoid the cleaning medium supply piece from being blocked.

Description

Fan cleaning device for range hood and range hood

Technical Field

The utility model 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 the self-cleaning technology of the range hood, steam cleaning or water cleaning is widely applied to the field of self-cleaning of the range hood, and the basic principle is that a steam generator generates steam or water is pumped by a water pump to convey the steam or water to a nozzle at the tail end of a spray pipe, and the steam or water is quickly sprayed out from the nozzle to flush an impeller and a volute for cleaning.

At present, a fixed hole is generally formed on a spray pipe, and the number of the holes is generally more than 3, for example, a steam generator, a cleaning system and a range hood disclosed in the utility model patent of invention with the patent application number of CN201310377600.5 (publication number of CN104421988A) discloses a steam generator, a cleaning system and a range hood, wherein the steam generator comprises: a body having a heating cavity therein, the heating cavity having an inlet and an outlet; the heating element is arranged on the body and used for heating the liquid in the heating cavity; and the delivery tube is arranged in the heating cavity, the upper end of the delivery tube is sealed, the lower end of the delivery tube is opened, the lower end of the delivery tube is connected with the outlet of the heating cavity, and a plurality of guide holes are formed in the delivery tube.

However, the cleaning method has the following defects: firstly, the cleaning medium supply part needs to be provided with a plurality of spray holes as outlets for spraying the cleaning medium, on one hand, the cleaning effect is poor because of the limited spray holes, and on the other hand, because the quantity of the spray holes is multiple and the power of a steam generator or a pump is constant, the steam pressure or the water pressure from the spray holes is correspondingly low and unstable, so that the cleaning effect is poor; secondly, the situation that the cleaning medium supply part is blocked easily occurs when the outlet of the cleaning medium supply part is positioned in the volute for a long time; third, existing cleaning devices require a large amount of space, which is difficult to support by the size of existing products; fourthly, the existing cleaning structure is greatly modified for the original structure of the fan, and the performance of the fan is easily influenced; fifthly, for the impeller, oil stains at local positions are relatively stubborn, and the oil stains cannot be completely removed under the condition that the oil stains at other positions are completely removed, but if the cleaning time is increased, the power consumption is greatly wasted.

SUMMERY OF THE UTILITY MODEL

The utility model provides a fan cleaning device for a range hood, which can realize a full-coverage efficient cleaning function and aims to solve the first technical problem in the prior art.

The second technical problem to be solved by the present invention is to provide a fan cleaning device for a range hood, which can prevent a cleaning medium supply member from being blocked, in view of the current situation of the prior art.

The third technical problem to be solved by the utility model is to provide a fan cleaning device for a range hood, which occupies a small space and aims at the current situation of the prior art.

The fourth technical problem to be solved by the utility model is to provide a fan cleaning device for a range hood, which has small modification on the original structure of a fan and does not influence the performance of the fan.

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

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

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

The technical scheme adopted by the utility model for solving the first and second technical problems is as follows: the utility model provides 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 yielding hole;

and also comprises

The cleaning medium supply piece is provided with a penetrating part which can extend into the volute, and the penetrating part is provided with an outlet for ejecting the cleaning medium; and

the driving device, its power take off end with wear to establish the portion transmission and be connected for drive should wear to establish the portion and pass the hole of stepping down for the spiral case motion, so that wear to establish the portion at least have two kinds of states:

in a 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 in an ejection area where the cleaning medium is ejected to the impeller;

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

In order to further solve the third and fourth technical problems, the movement track of the penetrating part at least at one end far away from the outlet is in a non-linear shape, so that the minimum distance between one end far away from the outlet of the penetrating part and the volute is smaller than the length of the penetrating part when the outlet of the penetrating part moves to the abdicating hole. Thus, the cleaning medium supply member can cover a large cleaning range in a small space.

Specifically, the first scheme is as follows: under the working state, the whole penetrating part moves in a curve.

In order to make the moving space occupied by the cleaning medium supply member small enough, the whole penetrating part swings.

In order to avoid the 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 movement 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 driving device to the cleaning medium supply piece, the cleaning medium supply piece 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 first end of the connecting arm is connected to the peripheral wall of the rotating shaft, and the second end of the connecting arm is connected to the cleaning medium supply piece.

Or the cleaning medium supply part 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 disposed on a first side of the cleaning medium supplying member in an extending direction of the cleaning medium supplying member;

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

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 oil stains, 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 of the cleaning medium is shortest.

The second scheme is as follows: the cleaning medium supply part is an elastic part, and an outlet of the cleaning medium supply part moves linearly in a working state. Therefore, the linear motion of the outlet can realize the coverage of a larger cleaning range, and the non-linear motion of the end, far away from the outlet, of the penetrating part can avoid occupying too much moving space when the penetrating part moves.

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

The at least two second racks are sequentially arranged on the cleaning medium supply piece along the extension direction of the cleaning medium supply piece, and the adjacent end parts of the two adjacent second racks are hinged;

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

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

Above-mentioned two kinds of schemes all occupation space is little, and little to the original structural transformation of fan (only need offer one supply wear to establish the portion of establishing on the spiral case promptly and pass the hole of stepping down can), do not influence the fan performance.

In order to further solve the fifth technical problem, the movement of one point a of the spraying area where the cleaning medium is sprayed to the impeller between the two end parts of the impeller in the axial direction is uniform.

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

wherein a point A at an injection region where the cleaning medium is injected to the impeller is defined as a point A at an outlet of the penetration portion₀Injecting;

omega is the rotating speed of the penetrating part;

theta is the rotation angle of the penetrating part;

h is an exit point A of the penetration part₀The minimum distance of the rotation center of (a) from the blade sprayed at point (a) at the spray region;

v₀is the moving speed of the point a at the jetting area.

In order to avoid the air current in the spiral case to cause its jam through stepping down the hole towards the export of wearing to establish the portion, under non-operating condition, wear to establish the portion have just right the terminal surface in hole of stepping down, the export of wearing to establish the portion is located the adjacent lateral wall of this terminal surface.

In order to facilitate the automatic leading-in of the cleaning medium, the cleaning device further 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 an inlet of the cleaning medium supply part through a steam pipe.

In order to collect sewage conveniently, the spiral case further comprises a water receiving box with an opening at the top, a drain hole is formed in the bottom of the spiral case, and the water receiving box is located right below the drain hole.

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

Preferably, the sensor be humidity transducer, the dirty can be left over to the part through the impeller that washs, the impeller is thrown away the back at a high speed, and water on the blade and the greasy dirt that flows are all thrown away, and its metal surface is in dry state, and its surface humidity is far higher than metal blade surface behind the greasy dirt adsorbed water, can detect the greasy dirt that the water content is high through humidity transducer this moment, carries out the location of greasy dirt.

The technical solution adopted by the present invention to solve the first technical problem may further be: the utility model provides 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 annular wall of the volute is provided with a yielding hole;

and also comprises

drive arrangement, its power take off with wear to establish the portion transmission and be connected for drive should wear to establish the portion and pass the hole of stepping down for the spiral case motion, so that wear to establish the portion and have operating condition:

in a 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 end parts of the impeller in the axial direction.

In order to further solve the second technical problem, the piercing part further comprises a non-operating state:

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

The technical scheme adopted by the utility model 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 solution adopted by the present invention to solve the seventh technical problem is: a control method of the fan cleaning device comprises the following steps:

spraying a cleaning medium to the rotating impeller by moving the penetrating part of the cleaning medium supply part so that the cleaning medium sprayed from the outlet of the cleaning medium supply part is shot to a spraying area at the impeller to move back and forth between two end parts of the impeller in the axial direction, and the whole impeller is cleaned globally;

step two, generating centrifugal force by rotating the impeller, and removing cleaning media and grease on the surface of the impeller;

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

and fourthly, spraying the cleaning medium to the rotating impeller by moving the penetrating part of the cleaning medium supply part, so that the cleaning medium sprayed from the outlet of the cleaning medium supply part is sprayed to the spraying area at the impeller to reciprocate between two end parts in the axial direction of the oil-stained area, and the oil-stained area is cleaned in an area mode.

In order to ensure that the cleaning time of each position of the impeller is consistent as much as possible in practical application, the smaller the variable speed interval of the cleaning medium supply part is, the better the variable speed interval is, and the variable speed interval has two schemes:

according to the first scheme, the time interval between two adjacent speed changes of the penetrating part is delta t, and the value of delta t is 1-100 ms.

And in the second scheme, the rotation angle interval of two adjacent variable speeds of the penetrating part is delta theta, and the value of the delta theta is 0.1-1 degrees.

And in the third scheme, the driving source of the penetrating part is a stepping motor, the interval of the number of steps of two adjacent speed changes of the stepping motor is delta n, and the value of the delta n is 1-200.

In principle, as the purpose of the scheme is to ensure that the cleaning time at each position of the impeller is consistent, the time is more suitable for being used as the variable speed interval; of course, when the driving source is a stepping motor, it is simpler to set the number of steps as the shift interval.

In order to correct the step difference, the step three and the step four are realized by the following method: in the third step, in the rotation process of the sensor, the rotation angle theta n of the penetrating part when the sensor collects the oil-stained area every time is recorded; in the fourth step, the penetration part is rotated to a corresponding rotation angle theta 'n for region cleaning, wherein theta' n is theta n + delta theta ', and delta theta' is an included angle between the penetration part cleaning medium injection path and the sensor detection medium ejection path.

In order to ensure the sampling accuracy, the time interval between two adjacent samplings of the sensor in the third step is delta t ', and the value of delta t' is 1-100 ms.

In order to ensure that the cleaning effect of the cleaning medium is exerted to the maximum, the four steps are realized by the following method: and sequencing the oil stain areas collected in the step three according to the area size, and sequentially cleaning the oil stain areas according to the descending order of the area size.

In order to match 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 prompting for the customer, the self-cleaning prompting is performed before the step one by the following method: and judging whether the time from the last cleaning to the present exceeds the maximum cleaning interval time D allowed in the normal state, judging whether the accumulated use time from the last cleaning to the present exceeds the maximum accumulated use time H allowed in the normal state, and if the two conditions are met simultaneously, 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 utility model has the advantages that:

(1) the penetrating part of the cleaning medium supply part is driven by the driving device to move relative to the volute so that the penetrating part has at least two states: in a 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 in a spraying area where the cleaning medium is sprayed to the impeller, so that the impeller is fully covered and efficiently cleaned; in a non-working state, the outlet of the penetrating part exits the volute to avoid the outlet of the penetrating part from being blocked;

(2) by arranging the penetrating part on the abdicating hole of the volute in a penetrating way, the movement track of at least one end of the penetrating part far away from the outlet is in a non-linear 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 abdicating hole; like this, wear to establish the portion and just can cover great washing scope in less activity space, on the one hand, occupation space is little, and on the other hand is little to the original structural transformation of fan, does not influence the fan performance.

Drawings

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

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

FIG. 3 is a longitudinal cross-sectional view of FIG. 2 with the water tank, steam generator and water-receiving receptacle omitted;

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

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

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

FIG. 7 is a left side view of the cleaning medium supply member rotated to a mid-pan position in the case where the blower of FIG. 3 is a dual inlet blower;

FIG. 8 is a schematic view showing the relative positions of the cleaning medium supplying member and the blades in FIG. 2 during rotation;

fig. 9 is a flowchart of a self-cleaning prompt performed by the range hood in embodiment 1 of the present invention;

fig. 10 is a flowchart of the overall cleaning of the extractor hood according to embodiment 1 of the present invention (time is used as a sampling interval);

fig. 11 is a flowchart of the overall cleaning of the extractor hood according to embodiment 1 of the present invention (step number is used as sampling interval);

fig. 12 is a flowchart of the extractor hood according to embodiment 1 of the present invention for collecting oil-stained areas;

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

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

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

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

fig. 17 is a longitudinal sectional view of the fan, the cleaning medium supply member and the driving device in the operating state in embodiment 4 of the extractor hood of the present invention.

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

Example 1:

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

The fan 2 is disposed in the housing 1, and includes a volute 21, an impeller 22 disposed in the volute 21, and a driving member 23 for driving the impeller 22 to rotate. As shown in fig. 3, a relief hole 211 is formed in the circumferential wall of the volute casing 21 at the position of the volute tongue 210, and a drain hole 212 is formed in the bottom of the volute casing 21; a plurality of axially extending blades 221 are circumferentially spaced on the impeller 22.

The cleaning medium supply part 3 is tubular, and has a front section, a middle section and a rear section in sequence along the flowing direction of the cleaning medium, an inlet 301 for the cleaning medium to enter is arranged on the end surface of the front section of the cleaning medium supply part 3, the middle and rear sections of the cleaning medium supply part 3 are marked as a penetrating part 30, the penetrating part 30 is a rigid part and can extend into the volute 21, and an outlet 302 for the cleaning medium to eject is arranged on the end surface of the penetrating part 30. In this embodiment, the cleaning medium supply member 3 is a rigid member as a whole.

The driving device 4 is a motor, is installed at the volute tongue 210 of the volute 21, and the power output shaft thereof is in transmission connection with the cleaning medium supply member 3 through the rotating seat 31. Specifically, the rotating base 31 comprises a rotating shaft 311 and a connecting arm 312, wherein the rotating shaft 311 is coaxially connected to a power output shaft of the driving device 4; the connecting arm 312 has a first end connected to the outer peripheral wall of the rotating shaft 311 and a second end connected to the front end of the cleaning medium supplying member 3.

The driving device 4 is activated to drive the penetrating portion 30 of the cleaning medium supplying member 3 to rotate through the abdicating hole 211 relative to the axis of the rotating shaft 311 for swinging motion (i.e., reciprocating motion within a certain angle range around a certain axis), so that the cleaning medium supplying member 3 has at least two states:

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

in the non-operating state, the outlet 302 of the penetration portion 30 exits the volute 21, avoiding the outlet 302 of the penetration portion 30 being blocked.

In the present invention, the "ejection area" refers to an area where the cleaning medium is once ejected from the outlet 302 and comes into contact with the blade 221 of the impeller 22, and does not include an area where the cleaning medium flows along the blade 221 after being ejected onto the blade 221 or drops from the blade 221. The shape and size of the spray area are related to the structure and shape of the outlet 302 itself and the movement manner of the penetration portion 30, and the present invention is not limited to the shape and size of the spray area, and the spray area may be cleaned up to a portion between both end portions in the axial direction of the impeller 22 by reciprocating movement when the cleaning apparatus is operated.

As shown in fig. 3, since the movement locus of the piercing portion 30 at least at the end away from the outlet 302, that is, the point B, is a non-linear shape, the minimum distance L between the end of the piercing portion 30 away from the outlet 302, that is, the point B, and the scroll casing 21 is smaller than the length of the piercing portion 30 in a state where the outlet 302 of the piercing portion 30 is moved to the relief hole 211. In this way, the cleaning medium supply member 3 can cover a large cleaning range in a small space of movement. On the one hand, occupation space is little, and on the other hand, it is little to the original structural transformation of fan (namely only need set up one on spiral case 21 and supply to wear to establish the hole 211 of stepping down that portion 30 passed can), does not influence the fan performance.

In order to ensure that the spraying region of the cleaning medium sprayed 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 arranged at an angle to the central axis of the impeller 22 (i.e., the included 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 does not overlap the central axis of the impeller 22), because: when the rotation axis of the penetration portion 30 is parallel to or overlaps the central axis of the impeller 22, the injection region of the cleaning medium injected from the outlet 302 of the penetration portion 30 toward the vane 221 reciprocates along the circumferential direction of the impeller 22, so that when the rotating penetration portion 30 injects steam to the rotating impeller 22, the injection region can only cover one ring surface of the impeller 22 having a narrow periphery, and cannot cover other positions of the impeller 22 in the axial direction, and the rotation of the penetration portion 30 is meaningless because the same cleaning effect can be achieved even if the penetration portion 30 does not rotate in this case. 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 of the cleaning medium sprayed from the outlet 302 of the penetrating portion 30 to the blade 221 moves along the axial direction of the impeller 22, i.e. the length direction of the blade 221, and the stroke is shortest. Of course, in practical applications, it may not be possible to ensure precisely that the movement path of the spray area is completely parallel to the central axis of the impeller 22, and when the movement path deviates from the central axis of the impeller 22 by a certain angle, the entire cleaning of the impeller 22 can still be completed, but the stroke of the spray area is relatively extended.

In order to avoid the interference between the penetrating part 30 and the volute 21 during the rotation process when the aperture of the abdicating hole 211 is small, the part of the penetrating part 30 passing through the abdicating 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 part 30), the outer diameter of the arc segment is D1, the aperture of the abdicating hole 211 is D2, and the relationship between D1 and D2 satisfies: d1 is not less than D2 is not less than 1.2D 1. Certainly design into D1 become D2 for the best, can guarantee like this and rotate the in-process, wear to establish the circular arc section of portion 30 and block up the hole 211 of stepping down all the time, avoid cleaning medium and the greasy dirt in the spiral case 21 to spill through the hole 211 of stepping down on the one hand, on the other hand can avoid influencing the normal work of fan 2. Of course, in practical applications, the shape of the relief hole 211 may also be designed to be square, and the cross-sectional shape of the arc segment may be adapted to the shape of the relief hole 211.

In addition, as shown in fig. 7, it is verified through experiments that, for the impeller with double air inlets (the impeller 22 has the middle disc 222), the front end is generally the main air inlet, the rear end is the auxiliary air inlet, and the oil stains are intensively arranged at the position where the blades 221 pass through the middle disc 222, based on the above phenomenon, in the present embodiment, the cleaning medium supply member 3 is arranged close to the middle disc 222 when being arranged, so that when the spraying area corresponds to the middle disc 222 (that is, the spraying area moves to the position where the blades 221 pass through the middle disc 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 greater the spraying force, which is helpful to uniformly clean the whole impeller according to the distribution amount of the oil stains.

In order to ensure that the washing time of each point on the vane 221 is substantially the same, it is necessary to set the reciprocating motion of one point a of the spraying area where the cleaning medium is sprayed to the impeller 22 along the axial direction between the two end portions of the impeller 22 to be a uniform motion, and the motion of the penetrating portion 30 is preferably set to be a variable speed motion, and the derivation formula is as follows:

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

due to v₀t is htan θ t, i.e.

Therefore, the temperature of the molten metal is controlled,

wherein a point A of the spray area where the cleaning medium is sprayed toward the impeller 22 is defined as a point A of the outlet 302 of the penetration portion 30₀Injecting;

ω is the rotation speed of the penetration portion 30;

theta is a rotation angle of the penetration portion 30;

h is the point A at the outlet 302 of the penetration portion 30₀The minimum distance of the center of rotation of (a) from the blade 221 ejected at point a at the ejection region;

v₀is the moving speed of the point a at the jetting area.

In the present embodiment, when t is 0, θ is 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 can heat 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, a water suction pump is integrated at the water inlet end of the steam generator 6.

The top of the water receiving box 7 is provided with an opening, and the water receiving box 7 is positioned right below the drainage hole 212 of the volute 21 and is used for receiving sewage drained from the drainage 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, which is convenient for installation.

Because self-cleaning requires a user to add clean water and pour waste water, the amount of water is a factor concerned by the user, and if too much water is needed in the cleaning process, a woman with less strength can feel operation labored, the use experience of the user is influenced, and the satisfaction degree of the product is reduced; similarly, if a user needs to wait beside the range hood, workers who work fast can be dissatisfied by adding clear water and pouring waste water for many times. Therefore, the water consumption of the range hood self-cleaning technology is small, so that the capacity of the water tank 5 and the water receiving box 7 is about 650 ml.

The sensor 8 is mounted at a position near the outlet 302 of the penetration portion 30, and detects the amount of oil contamination at each position in the axial direction between both end portions in the axial direction of the impeller 22. In this embodiment, the sensor 8 is a humidity sensor, the impeller 22 after being cleaned has local oil stain left thereon, after the impeller 22 is thrown away at a high speed, water and flowing oil stain on the blades 221 are thrown away, the metal surface is in a dry state, and the surface humidity of the oil stain is far higher than that of the metal blade surface after water is absorbed by the oil stain, at the moment, the oil stain with high water content can be detected by a humidity sensor to position the oil stain, and particularly, since the sensor 8 rotates synchronously during the rotation of the penetrating part 30, the detection area of the detection medium emitted from the sensor 8 and emitted to the vane 221 reciprocates along the axial direction of the impeller 22, i.e., the length direction of the vane 221, therefore, the humidity of the corresponding detection area is detected, after the impeller 22 is thrown away at a high speed, water at the position with less oil stain is easily thrown away, and water at the position with more oil stain is more remained, so that the higher the humidity is, the more oil stain is represented; the oil stain detection device is expanded by the method, a surface temperature detection sensor can also be used, due to the fact that the heat conductivity coefficients of metal and oil stain are different, in the short centrifugal throwing-off time, the metal surface and the oil stain surface have obvious temperature difference, oil stain can be identified by the thermal imaging principle, and the purpose of detecting the oil stain is achieved.

Of course, the cleaning medium supplier 3, the driving device 4, the water tank 5, the steam generator 6, the water receiver 7 and the sensor 8 may also constitute an independent cleaning device, which is not limited to cleaning the impeller 22, but may also be used to clean other parts of the range hood stained with oil, such as the inner wall of the volute 21. 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, so that the cleaning medium ejected from the outlet 302 of the moving part can cover a large cleaning range under the condition that the moving range of the cleaning medium supply member 3 is small, 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 much as possible, and the moving part is prevented from occupying too much space.

The working principle of the embodiment is as follows:

(1) starting the driving part 23, the driving device 4 and the steam generator 6, the water in the water tank 5 enters the steam generator 6 through the water pipe 61, the steam generator 6 heats the water to generate steam, and the steam is conveyed to the cleaning medium supplying part 3 through the steam pipe 62, the rotating penetrating part 30 sprays the steam to the rotating impeller 22, so that the spraying area of the steam axially reciprocates between the front end part and the rear end part of the impeller 22, and the whole impeller 22 is cleaned globally:

first, as shown in fig. 4, the cleaning medium feeder 3 is in the initial position, and the steam emitted from the outlet 302 of the penetration portion 30 is sprayed toward the rear end edge of the blade 221;

secondly, as shown in fig. 5, as the cleaning medium supplying member 3 further rotates, the position aimed at by the outlet 302 of the penetrating portion 30 moves to the front end, and the steam spraying area slowly moves to the front end;

thirdly, as shown in fig. 6, when the spraying area reaches the most front end of the blade 221, the driving device 4 switches the rotation direction to start the secondary washing of the blade 221;

fourthly, until the spraying area returns to the rearmost end of the blade 221, the driving device 4 converts the rotation direction again and repeats the movement;

after the cleaning is finished, in a non-working state, the cleaning medium supply member 3 rotates outwards to completely separate from the abdicating hole 211, so that the outlet 302 of the penetrating part 30 exits from the volute casing 21, and the risk of blockage of the outlet 302 of the penetrating part 30 caused by long-term placement in the volute casing 21 is avoided as much as possible, however, because the abdicating hole 211 is not blocked any more, the airflow in the volute casing 21 still easily rushes to the outlet 302 of the penetrating part 30 through the abdicating hole 21 to cause blockage;

(2) after the overall 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, the grease on the blade 221 is detected, and the detection result is recorded into a database;

after overall cleaning, centrifugal force of high-speed throwing is used for throwing away, the purpose is to throw away the oil stain and cleaning water which are washed loose, the burden of accurate cleaning is reduced, and the liquid oil-water mixture covers the surface of the oil stain to weaken the cleaning force of high-pressure jet flow;

(3) starting regional cleaning, wherein when the regional cleaning is carried out, the cleaning medium supply part 3 is actively positioned to a point with oil stains, starting fixed-point cleaning until the regional cleaning is completely cleaned, sequencing the area of a plurality of oil stains, and preferentially cleaning the region with large oil stain area;

because present self-cleaning technique all is that the user adds water by oneself, if add water too much at every turn and add water, save waste water, fall waste water and all form burden and risk to the user, can not all the sanitization with impeller 22 through once complete washing under the general condition moreover, regional washing can be preferentially to the position that the viscous oil is many and wash to effectively promote the clean rate.

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

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

s002, judging whether the T1 and the T2 satisfy: t1 > D and T2 > H, if yes, proceed to S003, if no, proceed to S005;

s003, lightening a self-cleaning prompt and entering S004;

s004, judging whether a 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 allowable cleaning interval time in a normal state, grease is easily removed when just adhering to the surface of the impeller, the adhered grease is gradually oxidized along with the passage of time, and the cleaning is efficient before the grease is oxidized, so the value of D is preferably 1-180 days, most preferably 90 days, and the grease oxidation rate is low;

h is the maximum allowable accumulated use time in a normal state, for some users, the use time is less at ordinary times, the scheme defines the time length of the accumulated time from the last cleaning to the present time, for the users who use less 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 the self-cleaning operation of the range hood comprises the following steps of:

step one, cleaning medium is sprayed to the rotating impeller 22 by moving the cleaning medium supply part 3, so that the spraying area of the cleaning medium reciprocates along the axial direction between the front end part and the rear end part of the impeller 22, and the whole impeller 22 is cleaned globally;

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

s101, starting to drive the impeller 22 to rotate by starting the driving part 23, wherein the initial value of theta is 0, the initial value of t is 0, and the process enters S102;

s102, the start-up drive device 4 drives the cleaning medium feeder 3 to rotate forward, records ta, and proceeds to S103;

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

s104, judging whether the theta value satisfies the following conditions: if theta is larger than or equal to theta max, the step goes to S106, and if not, the step goes to S105;

s105, judging whether the t value satisfies: t-ta is larger than or equal to delta t, if yes, the step returns to S102, and if not, the step returns to S103;

s106, the driving device 4 is started to drive the cleaning medium supply unit 3 to rotate in the reverse direction, ω ═ f (t), tb is recorded, and the process proceeds to S107;

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

s108, judging whether the theta value meets the following conditions: theta is less than or equal to 0, if yes, the process goes to S110, and if not, the process goes to S109;

s109, judging whether the t value satisfies the following conditions: t-tb is larger than or equal to delta t, if yes, the step returns to S106, and if not, the step returns to S107;

s110, judging whether the t value satisfies: t is more than or equal to t0, if yes, the process goes to S111, and if no, the process returns to S102;

s111, closing the driving piece 23 and the driving device 4, and finishing;

wherein θ max is a rotation angle when the spray region of the cleaning medium supplier 3 is located at the foremost end of the impeller 22, and the value is preferably 30 to 75 °;

delta t is the time interval of two adjacent speed changes of the driving device 4, the smaller the value is, the more the reciprocating motion of the cleaning medium between two axial end parts of the impeller 22 at one point A at the spraying area where the cleaning medium is sprayed to the impeller 22 along the axial direction is ensured to be uniform motion, and the value is preferably 1-100 ms;

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

of course, Δ θ may be used as the rotation angle interval between two adjacent speed changes of the driving device 4, and the value is preferably 0.1 to 1 °.

Alternatively, a stepping motor may be used as the driving device 4, so that, as shown in fig. 11, the first step can be implemented by:

s101, starting to drive the impeller 22 to rotate by starting the driving part 23, wherein the initial value of theta is 0, the initial value of n is 0, and the step S102 is entered;

s102, the start-up drive device 4 drives the cleaning medium feeder 3 to rotate forward, records na, and proceeds to S103;

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

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

s106, the start-up driving device 4 drives the cleaning medium feeder 3 to rotate in the reverse direction, ω ═ f (t), records nb, and the process proceeds to S107;

s107, collecting n and theta values, and entering S108;

s108, judging whether the theta value meets the following conditions: theta is less than or equal to 0, if yes, the process enters S110, and if not, the process enters S109;

s109, judging whether the n value satisfies the following conditions: n-nb is more than or equal to delta n, if yes, the step returns to S106, and if not, the step returns to S107;

s111, closing the driving piece 23 and the driving device 4, and finishing;

where n is the number of steps of the stepping motor, and since the stepping motor step angle is 360 °/(number of rotor teeth × n), when n is determined, the value of θ can be calculated;

and delta n is the step interval of two adjacent speed changes of the stepping motor, and the value is preferably 1-200.

Step two, generating centrifugal force by rotating the impeller 22, thereby removing cleaning media and grease on the surface of the impeller 22;

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

detecting the oil stain amount at each position along the axial direction between the two axial end parts of the impeller 22 by the rotation sensor 8, and collecting the oil staining area of the impeller 22;

specifically, as shown in fig. 12, the above steps are implemented by the following method:

s301, starting to start, starting to start, the sensor 8;

s302, the start-up drive device 4 drives the cleaning medium feeder 3 to rotate in the normal direction, records "ω ═ f (θ)" and records "ta", and the process proceeds to S303;

s303, judging whether the t value satisfies: if t-tc is more than or equal to delta t', the process goes to S304, and if not, the process goes to S307;

s304, collecting

Recording tc, proceeding to S305;

s305, judgment

Whether the value satisfies:

if yes, entering S306, otherwise, entering S307;

s306, recording θ n, and proceeding to S307 when n is equal to n + 1;

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

s308, judging whether the theta value satisfies the following conditions: if theta is larger than or equal to theta max, the process goes to S3010, and if not, the process goes to S309;

s309, judging whether the t value satisfies: t-ta is larger than or equal to delta t, if yes, returning to S302, and if not, returning to S303;

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

Δ t is a time interval between two adjacent speed changes of the driving device 4, and the smaller the value is, the more the spraying area of the cleaning medium sprayed to one point A in the impeller 22 can be ensured to move uniformly along the axial reciprocating motion between two end parts of the impeller 22 in the axial direction, and the value is preferably 1-100 ms;

the delta t' is the time interval between two adjacent sampling of the sensor 8, the smaller the value is, the greater the sampling precision is, and the value is preferably 1-100 ms;

is the maximum oil stain allowed under normal stateThe characterization value, in this embodiment, is preferably 20 to 100% (humidity);

and fourthly, spraying the cleaning medium to the rotating impeller 22 by moving the cleaning medium supply part 3, so that the spraying area of the cleaning medium reciprocates along the axial direction between the front end part and the rear end part of the oil-stained area, and performing area cleaning on the oil-stained area.

Specifically, the four steps are realized through the following method: sequencing the oil stain areas collected in the third step according to the area size, and sequentially cleaning each oil stain area according to the descending order of the area size, namely rotating the cleaning medium supply part 3 to a corresponding rotation angle theta ' n for area cleaning, wherein the stable included angle is formed between the sensor 8 and the cleaning medium supply part 3, so that the step difference needs to be corrected by delta theta ' during data processing, namely theta ' n is theta n + delta theta ', and delta theta ' is the included angle between a cleaning medium injection path of the cleaning medium supply part 3 and a medium ejection path detected by the sensor 8; as to how to sort the oil stain areas according to the area size, in this embodiment, the recorded θ 1, θ 2, … …, and θ n are analyzed to determine 2 continuous oil staining points and 3 continuous oil staining points … …, specifically, whether the rotation angle of one unit time is detected by two adjacent oil staining point angles, whether three continuous oil staining points are the rotation angles of … … in two unit times is detected, and finally, the accurate cleaning is realized in reverse order because counting into the database later is more continuous.

Example 2:

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

in this embodiment, as shown in fig. 13, in the non-operating state, the end surface of the penetrating portion 30 faces the relief hole 211, and the outlet 302 of the penetrating portion 30 is located on the adjacent sidewall of the end surface, so that in the non-operating state, the airflow in the volute 21 is not easy to rush to the outlet 302 of the penetrating portion 30 through the relief hole 21 to cause blockage.

Example 3:

as shown in fig. 14 and fig. 15, it is a third preferred embodiment of the range hood of the present invention. The difference from example 2 is that:

in this embodiment, the cleaning medium supply member 3 'is in a scroll shape, wherein the rear section is a penetrating portion 30', and the cleaning medium supply member 3 'is in transmission connection with the power output end of the driving device 4 through a 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 arranged on a first side of the cleaning medium supplying member 3 ' in the extending direction of the cleaning medium supplying 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 casing 21 at the second side of the cleaning medium supplying member 3 ' such that the cleaning medium supplying member 3 ' is interposed between the first gear 312 ' and the elastic stopper 313 '.

The driving device 4 is activated to drive the first gear 312 ' to rotate, and since the first rack 311 ' is engaged with the first gear 312 ', the first rack 311 ' drives the cleaning medium supply member 3 ' to make a spiral curve motion relative to the volute 21.

The working principle of the embodiment is as follows:

(1) as shown in fig. 14, in the non-operating state, the outlet 302 ' of the through portion 30 ' exits the volute 21, so as to avoid the risk of blockage of the outlet 302 ' of the through portion 30 ″ due to long-term placement in the volute 21;

(2) when cleaning is required, the driving device 4 drives the cleaning medium supply member 3 ' to make a spiral curvilinear motion relative to the volute casing 21 so that the outlet 302 ' of the penetration portion 30 ' extends into the volute casing 21 and faces the vane 221 of the impeller 22. as shown in fig. 15, in an operating state, the rotation direction of the driving device 4 is periodically changed, and the cleaning medium emitted from the outlet 302 ' of the penetration portion 30 ' can be made to reciprocate between the two end portions of the impeller 22 in the axial direction toward the ejection area of the vane 221, thereby cleaning the impeller 22.

Example 4:

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

in this embodiment, the receding hole 211 is formed in the end wall of the volute casing 21, the cleaning medium supplying member 3 ″ is an elastic strip-shaped pipe, the rear section of the cleaning medium supplying member is the penetrating portion 30 ″, the cleaning medium supplying member 3 ″ is in transmission connection with the power output end of the driving device 4 through the second transmission component 31 ″, and the second transmission component 31 ″ includes the second rack 311 ″, the second gear 312 ″, and the stop collar 313 ″. Specifically, the number of the second racks 311 "is at least two, the second racks are sequentially sleeved on the cleaning medium supplying piece 3" along the extending direction of the cleaning medium supplying piece 3 ", and the adjacent ends of the two adjacent second racks 311" are hinged; the second gear 312 "is coaxially connected to the power output end of the driving device 4 and can be meshed with each second rack 311"; the stopper 313 "is installed on the scroll casing 21 and has a bent passage 3131" therein 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, since the second rack 311" can be engaged with each second gear 312 ", the second rack 311" drives the cleaning medium supply member 3' to move relative to the volute casing 21, during the moving process, the outlet 302 "of the penetrating portion 30" moves linearly, one end of the penetrating portion 30 "far away from the outlet 302" moves along the bending passage 3131 ", the moving track is in a non-linear shape, and the non-linear shape can be a curve, a broken line, etc., and can be a regular track or an irregular track, as long as the non-linear motion is ensured.

The working principle of the embodiment is as follows:

(1) as shown in fig. 16, in the non-operating state, the outlet 302 "of the penetrating portion 30" exits the volute casing 21, so as to avoid the risk of blocking the outlet 302 "of the penetrating portion 30" due to long-term placement in the volute casing 21, and the cleaning medium supplying member 3 "is arranged along the bending passage 3131" under the limit of the limiting 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 backward relative to the volute casing 21, so that the outlet 302 ″ of the penetrating part 30 ″ extends into the volute casing 21 and faces the vane 221 of the impeller 22, as shown in fig. 17, in a working state, the cleaning medium supply member 3 ″ extending into the volute casing 21 restores to a long strip-shaped structure under the action of self elastic force, the rotating direction of the driving device 4 is periodically changed, and the cleaning medium emitted from the outlet 302 ″ of the penetrating part 30 ″ can be emitted to the spraying area at the vane 221 to reciprocate between two axial end parts of the impeller 22, so that the impeller 22 is cleaned; the cleaning medium supply member 3 ' exposed out of the volute casing 21 is arranged along the bending passage 3131 ' under the limit of the limit sleeve 313 ', so that the occupied space is reduced.

Claims

1. The utility model provides a fan belt cleaning device for range hood, including fan (2), this fan (2) is 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 comprises

A cleaning medium supply member (3; 3 ') having a penetration portion (30; 30') capable of being inserted into the scroll casing (21), the penetration portion (30; 30 ') being provided with an outlet (302; 302') through which the cleaning medium is ejected; 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 pass through the abdicating hole (211) to move relative to the volute (21) so that the penetrating part (30; 30 ') has at least two states:

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 spraying area of the cleaning medium sprayed from the outlet (302; 302 ') of the penetrating part (30; 30') to the impeller (22) moves between the two axial end parts of the impeller (22);

in the non-operating state, the outlet (302; 302 ') of the through-hole (30; 30') exits the volute (21).

2. The fan cleaning device for a range hood according to claim 1, wherein: the movement locus of the penetrating part (30; 30 ') at least at one end far away from the outlet (302; 302 ') is in a non-linear shape, so that the minimum distance between one end of the penetrating part (30; 30 ') far away from the outlet (302; 302 ') and the volute (21) is smaller than the length of the penetrating part (30; 30 ') under the condition that the outlet (302; 302 ') of the penetrating part (30; 30 ') moves to the abdicating hole (211).

3. The fan cleaning device for a range hood according to claim 2, wherein: in the operating state, the entire piercing section (30; 30') moves in a curve.

4. A fan cleaning apparatus for a range hood according to claim 3, wherein: in the working state, the whole penetrating part (30) swings.

5. The fan cleaning device for a range hood according to claim 4, wherein: the part of the penetrating part (30) passing through the abdicating hole (211) in the movement is an arc segment, and the center of the arc segment is positioned on the rotating axis of the penetrating part (30; 30').

6. The fan cleaning device for a range hood according to claim 3, 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 a 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).

7. The fan cleaning device for a range hood according to claim 3, wherein: the cleaning medium supply member (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 an 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'); and

and the elastic limiting block (313 ') is positioned at the second side of the cleaning medium supplying piece (3 ') so that the cleaning medium supplying piece (3 ') is clamped between the first gear (312 ') and the elastic limiting block (313 ').

8. The fan cleaning device for a range hood according to claim 3, wherein: the fan (2) is a double-air-inlet fan, the impeller (22) of the fan (2) is provided with a central disc (222), and when the spraying area corresponds to the central disc (222), the spraying path from the outlet (302; 302 ') of the penetrating part (30; 30') to the impeller (22) of the cleaning medium is shortest.

9. The fan cleaning device for a range hood according to claim 2, wherein: the cleaning medium supply member (3 ') is an elastic member, and the outlet (302 ') of the penetration portion (30 ') moves linearly in an operating state.

10. The fan cleaning device for a range hood according to claim 9, wherein: the cleaning medium supply piece (3 ') is in transmission connection with the power output end of the driving device (4) through a second transmission component (31 '), and the second transmission component (31 ') comprises

At least two second rack gears (311 ') which are sequentially arranged on the cleaning medium feeding piece (3') along the extending direction of the cleaning medium feeding piece (3 '), and the adjacent end parts of the two adjacent second rack gears (311') are hinged;

a second gear (312 ') coaxially connected to the power output end of the driving device (4) and capable of meshing with each second rack (311'); and

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

11. The fan cleaning device for a range hood according to claim 1, wherein: the cleaning medium is shot to a spraying area of the impeller (22), and the movement of one point A between two end parts of the impeller (22) in the axial direction is uniform motion.

12. The fan cleaning device for a range hood according to claim 11, 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) swings in a working state, and the cleaning medium is jetted to an injection area at the impeller (22) to move along the length direction of the blades (221);

wherein a point A of a spray area where the cleaning medium is sprayed toward the impeller 22 is defined as a point A of an outlet 302 of the penetrating part 30₀Injecting;

omega is the rotating speed of the penetrating part (30);

theta is a rotation angle of the penetrating part (30);

h is a point A at the outlet (302) of the penetration part (30)₀A minimum distance of the rotation center of (a) from the blade (221) ejected at point a at the ejection area;

v₀is the moving speed of the point a at the jetting area.

13. The fan cleaning device for a range hood according to claim 1, 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 the adjacent side wall of the end face.

14. The fan cleaning device for a range hood according to any one of claims 1 to 13, wherein: the cleaning device is characterized by further comprising a water tank (5) and a steam generator (6), 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 and can heat 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 an inlet (301; 301 ') of the cleaning medium supply part (3; 3') through a steam pipe (62).

15. The fan cleaning apparatus for a range hood according to any one of claims 1 to 13, wherein: the water-saving volute is characterized by further comprising a water receiving box (7) with an opening at the top, a drain hole (212) is formed in the bottom of the volute (21), and the water receiving box (7) is located right below the drain hole (212).

16. The fan cleaning device for a range hood according to any one of claims 1 to 13, wherein: a sensor (8) for detecting the amount of oil contamination is mounted on the cleaning medium supply member (3; 3 ') at a position close to the outlet (302; 302').

17. The fan cleaning device for a range hood according to claim 16, wherein: the sensor (8) is a humidity sensor.

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

and also comprises

A cleaning medium supply member (3; 3 ') having a penetration portion (30; 30') that can be inserted into the scroll casing (21), the penetration portion (30; 30 ') being provided with an outlet (302; 302') through which the cleaning medium is ejected; 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 pass through the abdicating hole (211) to move relative to the volute (21) so that the penetrating part (30; 30 ') has a working state:

in the operating state, the outlet (302; 302 ') of the penetration portion (30; 30') extends into the volute (21) and faces the impeller (22), and the spray area of the cleaning medium emitted from the outlet (302; 302 ') of the penetration portion (30; 30') toward the impeller (22) moves between the two axial end portions of the impeller (22).

19. The fan cleaning device for a range hood according to claim 18, wherein: in the operating state, the entire piercing section (30; 30') moves in a curve.

20. The fan cleaning device for a range hood according to claim 19, wherein: in the working state, the whole penetrating part (30) swings.

21. The fan cleaning device for a range hood according to claim 20, wherein: the part of the penetrating part (30) passing through the abdicating hole (211) in the movement is an arc segment, and the center of the arc segment is positioned on the rotating axis of the penetrating part (30; 30').

22. The fan cleaning device for a range hood according to claim 19, 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

23. The fan cleaning device for a range hood according to claim 19, wherein: the cleaning medium supply member (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

24. The fan cleaning device for a range hood according to claim 18, wherein: the piercing section (30; 30') also has a non-operating state:

in the non-operating state, the outlet (302; 302 ') of the through-penetration portion (30; 30') exits the volute (21).

25. The fan cleaning device for a range hood according to claim 24, wherein: in a non-working state, the penetrating part (30; 30 ') is provided with an end face facing the receding hole (211), and an outlet (302; 302 ') of the penetrating part (30; 30 ') is positioned on the adjacent side wall of the end face.

26. The fan cleaning apparatus for a range hood according to any one of claims 18 to 25, wherein: a sensor (8) for detecting the amount of oil contamination is mounted on the cleaning medium supply member (3; 3 ') at a position close to the outlet (302; 302').

27. The fan cleaning apparatus for a range hood of claim 26, wherein: the sensor (8) is a humidity sensor.

28. A range hood applying the fan cleaning device according to any one of claims 1 to 27, comprising a housing (1), wherein the fan (2) is disposed in the housing (1).