CN208832556U

CN208832556U - Fume exhauster

Info

Publication number: CN208832556U
Application number: CN201821345122.4U
Authority: CN
Inventors: 蔡晓龙; 谢志强; 李圣黄; 凌威
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2018-08-21
Filing date: 2018-08-21
Publication date: 2019-05-07
Anticipated expiration: 2028-08-21

Abstract

The utility model provides a range hood, including fan and spray set, the fan includes the wind wheel, and spray set is used for spraying towards the wind wheel including the portion of spraying, the portion of spraying. The oil smoke particles in the gas flowing through the wind wheel are combined with the water mist, so that the weight is increased, the gas is not easy to enter an outdoor environment through a public air duct, and the pollution to the environment is reduced. In addition, the oil smoke particles and the water mist are combined and then fall into the wind wheel or the range hood, and can flow into the oil cup after being accumulated, so that oil stains can be prevented from being attached to the wind wheel, the weight of the wind wheel is increased, and the operation of the range hood is influenced. Because can reduce the adhesion volume of greasy dirt on the wind wheel, the user need not wash the wind wheel, has promoted user's use and has experienced.

Description

Fume exhauster

Technical Field

The utility model relates to a kitchen electricity technical field, concretely relates to lampblack absorber.

Background

With the improvement of living standard of people, the range hood is a standard in every household kitchen. When the range hood works, the motor drives the wind wheel to rotate, negative pressure is generated in the smoke collection cavity of the range hood, and the range hood sucks external oil smoke into the smoke collection cavity by utilizing pressure difference.

In order to filter oil stains, filter screens are arranged on existing range hoods, but the filter functions of the filter screens are limited, the filter screens can only filter a part of oil smoke, the rest oil smoke continues to flow in an air duct and a fan, one part of oil smoke is attached to fan blades of the fan, and the other part of oil smoke is discharged to outdoor atmosphere to pollute the environment.

SUMMERY OF THE UTILITY MODEL

In view of this, an object of the utility model is to provide a range hood to solve the problem that the greasy dirt that adheres to on the wind wheel of range hood is too much difficult to clear up among the prior art, and the oil smoke enters into the polluted environment in the outdoor air.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a range hood, includes fan and spray set, the fan includes the wind wheel, spray set is including the portion of spraying, the portion of spraying is used for the orientation the wind wheel sprays.

Preferably, the fan is a centrifugal fan, and the spraying part is arranged inside a centrifugal wind wheel of the centrifugal fan and/or at an air inlet of the centrifugal wind wheel and/or at an air outlet of the centrifugal wind wheel.

Preferably, the spray part comprises a ring spray pipe and/or a line spray pipe.

Preferably, the spraying part is provided with a spraying port,

the spray openings are arranged on the radial inner side pipe wall and/or the radial outer side pipe wall of the annular spray pipe; and/or the presence of a gas in the gas,

the spraying openings are arranged along the extension direction and/or the circumferential direction of the linear spraying pipe.

Preferably, a high-pressure atomizing nozzle is arranged on the spraying opening.

Preferably, the spraying part is arranged inside the centrifugal wind wheel,

the spraying part is arranged in the middle of the centrifugal wind wheel in the axial direction, or,

the extension direction of the spraying part is consistent with the extension direction of the axis of the centrifugal wind wheel.

Preferably, the annular spraying pipe is coaxially arranged with the centrifugal fan, and the annular spraying pipe is arranged in the middle of the centrifugal fan in the axial direction; or,

the extension direction of the linear spray pipe is consistent with that of the axis of the centrifugal wind wheel, and the linear spray pipe is arranged in the radial center of the centrifugal wind wheel.

Preferably, a volute of the centrifugal fan is provided with a flow guide port, and the flow guide port is used for discharging liquid in the volute out of the volute.

Preferably, the spraying device comprises a drainage tube, a first end of the drainage tube is connected with the spraying part, and the drainage tube is used for guiding the spraying liquid into the spraying part.

Preferably, the lampblack absorber includes the mounting panel, the fixed setting of import tip of centrifugal fan's spiral case is in on the mounting panel, the first end of drainage tube by the inboard of mounting panel is passed the mounting panel, and orientation centrifugal fan buckles, so that it is located to spray the position the inside of centrifugal fan's centrifugal fan and/or the air intake department of centrifugal fan.

Preferably, the spraying device comprises a containing part for containing liquid, the second end of the drainage tube is connected with the containing part, and a liquid level detection device is arranged in the containing part and used for detecting the liquid level in the containing part.

Preferably, the range hood comprises an alarm device, the alarm device is connected with the liquid level detection device, and the alarm device is used for giving an alarm when the liquid level in the accommodating part is lower than the lowest liquid level value.

Preferably, the accommodating part comprises an accommodating cavity, the accommodating cavity is communicated with the second end of the drainage tube, and a heating device is arranged in the accommodating cavity and used for heating the liquid in the accommodating cavity.

Preferably, the accommodating part is provided with a liquid injection port, the liquid injection port is closed by a liquid injection plug, and water and/or cleaning agent can be injected into the accommodating part through the liquid injection port; and/or the presence of a gas in the gas,

the accommodating part is provided with a pump body for pumping the liquid in the accommodating part into the drainage tube.

Preferably, the spraying device comprises a liquid injection pipe, the accommodating part is provided with a liquid injection port, one end of the liquid injection pipe is communicated with the liquid injection port of the accommodating part, the other end of the liquid injection pipe is communicated with the liquid supply device, and the liquid injection pipe is provided with a control valve which is used for controlling the on-off of the liquid injection pipe.

Be provided with spray set on the lampblack absorber in this application, spray set's spray portion is to the wind wheel shower water or the cleaner of lampblack absorber, and the oil smoke tiny particle in the gas of wind wheel of flowing through combines back weight increase with water smoke, is difficult for along with during gas gets into outdoor environment through public wind channel, reduces the pollution to the environment.

In addition, the oil smoke particles and the water mist are combined and then fall into the wind wheel or the range hood, and can flow into the oil cup after being accumulated, so that oil stains can be prevented from being attached to the wind wheel, the weight of the wind wheel is increased, and the operation of the range hood is influenced. Because can reduce the adhesion volume of greasy dirt on the wind wheel, the user need not wash the wind wheel, has promoted user's use and has experienced.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 shows one of front views of a range hood according to an embodiment of the present invention;

fig. 2 shows a second front view of the range hood according to the embodiment of the present invention;

fig. 3 shows one of the structural diagrams of the range hood according to the embodiment of the present invention;

fig. 4 shows a second structure diagram of the range hood according to the embodiment of the present invention;

fig. 5 shows a third structure diagram of the range hood according to the embodiment of the present invention;

fig. 6 shows an enlarged view of the area a in fig. 5.

In the figure:

1. a fan; 11. a centrifugal fan; 12. a centrifugal wind wheel; 13. a fan blade;

2. a spraying device; 21. a spraying part; 211. an annular shower pipe; 212. a spray port; 22. a drainage tube; 23. a receptacle portion; 24. a liquid injection pipe;

3. a front panel; 31. a control panel; 311. an operation unit; 32. a smoke guide plate; 33. mounting a plate;

4. filtering with a screen;

5. an air outlet duct;

6. a rear panel;

7. an oil cup.

Detailed Description

The present invention is described below based on embodiments, and it is understood by those of ordinary skill in the art that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Description of the drawings: the directions such as 'inside' and 'outside' related in the description process of the application are described by taking the range hood as a reference object, the inside of the range hood is the position indicated by the direction 'inside', and the outside of the range hood is the position indicated by the direction 'outside'.

The application provides a range hood, including fan 1, fan 1 drives the air current and flows, forms the pressure differential between the inside of range hood and the outside, and under the effect of pressure differential, the outside air current of range hood enters into inside, takes away the oil smoke in the kitchen. Still be provided with spray set 2 on the lampblack absorber in this application, spray set 2 can spray towards fan 1's wind wheel to carry out the humidification to the air current through the wind wheel, avoided the small granule oil smoke to escape in the outdoor environment to a certain extent, strengthened the purifying effect of lampblack absorber greatly.

As shown in fig. 1, the application provides a side-draught range hood, which comprises a front panel 3, wherein a control panel 31 is arranged on the front panel 3, and a user can control the opening and closing and/or the operation mode of the range hood through the control panel 31. The front panel 3 is provided with the smoke guide plate 32, on one hand, the smoke guide plate 32 can shield the internal structure of the range hood, and the external aesthetic property of the range hood is improved; on the other hand, the smoke guide plate 32 can also play a certain effect of guiding and gathering smoke, and further improves the effect of sucking the oil smoke of the range hood.

As shown in fig. 2, a mounting plate 33 is disposed on the inner side of a smoke guide plate 32 of the range hood, the mounting plate 33 is used for mounting the spraying device 2 of the range hood and a volute (not shown in the figure) of the centrifugal fan 11, and when the volute is mounted, the volute is preferably detachably mounted through fasteners such as screws, so that a user can detach and clean the centrifugal wind wheel 12 of the centrifugal fan 11 conveniently. The filter screen 4 is fixedly arranged at the inlet end part of the volute, and the filter screen 4 is used for filtering the airflow entering the volute, so that the amount of oil smoke entering the volute is reduced, and oil stains are prevented from being attached to the centrifugal wind wheel 12 and the inner wall of the volute. An air outlet duct 5 is arranged at the outlet end part of the volute, the air outlet duct 5 is connected with a common flue, and oil smoke sucked from a kitchen is discharged into the common flue.

Further, the spraying device 2 comprises a spraying part 21, and the spraying part 21 may be disposed inside the centrifugal wind wheel 12 of the centrifugal fan 11 and/or at an air inlet of the centrifugal wind wheel 12 and/or at an air outlet of the centrifugal wind wheel 12. According to the difference of the structure of the range hood, the spraying part 21 can be independently arranged inside the centrifugal wind wheel 12, or independently arranged at the air inlet of the centrifugal wind wheel 12, or independently arranged at the air outlet of the centrifugal wind wheel 12. Of course, it can be understood that any two of the above three positions may be provided with the spraying parts 21, or all three positions may be provided with the spraying parts 21 to spray the centrifugal wind wheel 12, so as to remove the oil stain from the air flow passing through the centrifugal wind wheel 12 with the maximum effect.

In a preferred embodiment, as shown in fig. 3 to 5, the spraying part 21 is disposed inside the centrifugal wind wheel 12 to spray toward the fan blades 13 of the centrifugal wind wheel 12 from inside to outside. The spraying part 21 comprises an annular spraying pipe 211, in order to enable all positions of the centrifugal wind wheel 12 to be capable of contacting fog-state spraying liquid, the annular spraying pipe 211 is arranged in the middle of the axial direction of the centrifugal wind wheel 12, and the annular spraying pipe 211 and the centrifugal fan 11 are coaxially arranged, so that the spraying liquid can be contacted around an air inlet of the centrifugal wind wheel 12 and around one end of a motor connected with the centrifugal wind wheel 12, and oil dirt can be better fused. Further, the annular spraying pipe 211 is provided with spraying ports 212, and preferably, the spraying ports 212 are provided on a radially inner pipe wall and/or a radially outer pipe wall of the annular spraying pipe 211 to spray toward the centrifugal wind wheel 12 in all directions, so as to spray the centrifugal wind wheel 12 to the maximum extent. More preferably, be provided with high-pressure atomizing nozzle (not shown in the figure) on the mouth 212 that sprays, high-pressure atomizing nozzle can atomize and carry out the pressure boost to more efficient air current humidifies, makes the greasy dirt of tiny granule can be in the same place with liquid water better fuse.

In another preferred embodiment, the shower part 21 includes a linear shower (not shown in the drawings) extending in the same direction as the axis of the centrifugal wind wheel 12, and the linear shower is disposed at the radial center of the centrifugal wind wheel 12, so that the entire axial direction of the centrifugal wind wheel 12 can be effectively showered. The linear spray pipes are round pipes, and the spray ports 212 are arranged along the extension direction and/or the circumferential direction of the linear spray pipes so as to spray the centrifugal wind wheel 12 in a wider range. The line type shower stretches into the middle part of centrifugal wind wheel 12, and centrifugal wind wheel 12 rotates the in-process, and the line type shower sprays, and centrifugal wind wheel 12's whole circumferential direction can both be effectively sprayed.

As shown in fig. 3 to 6, the spraying device 2 includes a drainage tube 22 and a receiving portion 23, the receiving portion 23 is preferably fixed on the front panel 3 and located between the front panel 3 and the rear panel 6, a first end of the drainage tube 22 is connected to the spraying portion 21, a second end of the drainage tube 22 is connected to the receiving portion 23, and the drainage tube 22 is used for guiding the spraying liquid in the receiving portion 23 to the spraying portion 21 for spraying operation. Preferably, the second end of the drain tube 22 is connected to the bottom of the receiving portion 23 so that the spray liquid can more rapidly enter the drain tube 22 by gravity. More preferably, in order to ensure the spraying effect and avoid the situation that the spraying liquid cannot be supplied to the spraying part 21 in time, a pump body for pumping the liquid in the accommodating part 23 into the drainage tube 22 is arranged in the accommodating part 23, the pump body can be a common water pump or a high-pressure pump, and under the action of the pump body, the spraying liquid in the accommodating part 23 is pumped into the drainage tube 22 and then enters the spraying part 21.

In a specific embodiment, the accommodating portion 23 includes only one accommodating cavity (not shown) for accommodating a spraying liquid for spraying, and the spraying liquid may be a spraying liquid in a normal temperature state or a spraying liquid in a heated high temperature state. A heating device (not shown in the figure) may be disposed in the accommodating chamber to heat the spray liquid in the accommodating chamber. When a user wants to select a cold fog state for spraying, the heating device does not heat and directly produces fog; if the user wants to select the hot fog state to spray, the heating device heats and then fog. In another alternative preferred embodiment, the accommodating portion 23 comprises a first accommodating chamber and a second accommodating chamber, the first accommodating chamber and the second accommodating chamber are respectively communicated with the second end of the drainage tube 22, and a heating device is arranged in the first accommodating chamber and used for heating the liquid in the first accommodating chamber. The first accommodating cavity accommodates the spraying liquid in a high-temperature state, the second accommodating cavity accommodates the spraying liquid in a normal-temperature state, and a user can select to use the spraying liquid in different states in the first accommodating cavity or the second accommodating cavity according to actual conditions.

Further, the range hood comprises an alarm device (not shown in the figures) connected to the liquid level detection device (not shown in the figures) for alarming when the liquid level in the receiving portion 23 is lower than the lowest level value. The alarm device is arranged on the control panel 31 so that a user can find the alarm in time. The alarm device can be an audible and visual alarm, and can simultaneously perform audible alarm and optical alarm, and when the alarm is performed, the alarm device can give out simple audible alarm such as buzzing sound, and can also give out voice alarm such as 'liquid level is low, please add spraying liquid in time'. The alarm device can comprise an LED lamp, and when the alarm is given, the LED lamp emits light and flickers to remind a user of adding the spraying liquid. The alarm device can also be an LED display device, and the text information of 'liquid level is low, please add spraying liquid in time' is directly displayed on the alarm device, so that a better reminding effect is achieved.

Furthermore, in order to add the spraying liquid into the accommodating part 23 conveniently, a liquid injection port is formed in the accommodating part 23, the liquid injection port is sealed through a liquid injection plug, when the spraying liquid is added into the accommodating part 23 through the liquid injection port, the liquid injection plug is pulled out from the liquid injection port, after the liquid injection is completed, the liquid injection plug is inserted into the liquid injection port, water and/or a cleaning agent can be injected into the accommodating part 23 through the liquid injection port, and when the injected spraying liquid comprises water and the cleaning agent, the effect of cleaning the inside of the range hood can be achieved. Furthermore, in order to automatically add the spray liquid to the range hood without the need of a user to add the spray liquid in person when the spray liquid is insufficient, the spray device 2 comprises a liquid injection pipe 24, the accommodating part 23 is provided with a liquid injection port, one end of the liquid injection pipe 24 is communicated with the liquid injection port of the accommodating part 23, the other end of the liquid injection pipe 24 is communicated with a liquid supply device (not shown in the figure), and the liquid injection pipe 24 is provided with a control valve (not shown in the figure) for controlling the on-off of the liquid injection pipe 24. When the liquid level in the accommodating part 23 is lower than the lowest liquid level value, a control device (not shown) of the range hood controls the control valve to open, a liquid passage between the liquid supply device and the accommodating part 23 is communicated, and liquid in the liquid supply device enters the accommodating part 23 to replenish the accommodating part 23. The liquid supply device can be a tap water pipe or a device which is arranged outside the range hood and specially contains cleaning liquid. If the liquid supply device is a tap water pipe, a liquid injection port can be additionally arranged on the accommodating part 23 and plugged by a liquid injection plug, and the liquid injection port can be used for adding cleaning agents such as liquid detergent into the accommodating part 23.

Since the accommodating part 23 is disposed at the inner side of the mounting plate 33 and the shower part 21 is disposed at the outer side of the mounting plate 33, the arrangement of the draft tube 22 is required. Specifically, the first end of the draft tube 22 passes through the mounting plate 33 from the inner side of the mounting plate 33 and is bent toward the centrifugal wind wheel 12, so that the shower portion 21 is located inside the centrifugal wind wheel 12 of the centrifugal fan 11 and/or at the air inlet of the centrifugal wind wheel 12. In a specific embodiment, when the range hood is in a position in a normal use state, the drainage tube 22 is located below the centrifugal wind wheel 12, and after the first end of the drainage tube 22 passes through the mounting plate 33, the drainage tube is bent upwards by 90 degrees and then bent towards the centrifugal wind wheel 12 by 90 degrees, so that the spraying part 21 is located inside the centrifugal wind wheel 12 or at an air inlet of the centrifugal wind wheel 12. When the filter screen 4 is disposed at the inlet end of the volute of the centrifugal fan 11, the drainage tube 22 and the spraying part 21 need to penetrate through the filter screen 4 in the bending process, and then extend into the centrifugal wind wheel 12, or the air inlet of the centrifugal wind wheel 12.

Furthermore, the water molecules and the oil stain particles which are fused together after being sprayed are accumulated together to form small liquid drops, the small liquid drops drop into the volute from the centrifugal wind wheel 12, and in order to discharge the oil stain in time, a flow guide opening (not shown in the figure) is arranged on the volute of the centrifugal fan 11 and is used for discharging the liquid in the volute out of the volute. The bottom of the range hood is provided with an oil cup 7, oil stain discharged from the volute through the flow guide opening drops into the oil cup 7, and a user can clean the oil cup 7 regularly.

The controlling means of lampblack absorber in this application links to each other with control panel 31, and the user can spray whether to need portion 21 of spraying through control panel 31 to carry out humidification liquefaction to the oil smoke and control. An operation unit 311 is provided on the control panel 31, and the operation unit 311 may be in the form of a key or may be in the form of a touch. When a user needs to perform humidification and liquefaction operations on oil smoke, the operation unit 311 is triggered when the range hood is started, and the spraying part 21 performs spraying operations towards the centrifugal wind wheel 12 in the operation process of the centrifugal fan 11. If the user does not need to perform the humidifying and liquefying operation on the oil smoke, the operation unit 311 is not triggered when the range hood is started. If the user needs to use the humidification and liquefaction function, after the operation unit 311 is triggered, the control panel 31 sends a prompt to remind the user to select whether the spraying part 21 sprays the cold mist or the hot mist, and controls the drainage tube 22 to be communicated with the first accommodating cavity or the second accommodating cavity according to the selection of the user. Because the condensation effect of the cold mist is good, the oil smoke is humidified and liquefied by using the cold mist, and the oil smoke is easier to liquefy; because the decontamination capability of the hot mist is strong, a certain decontamination and cleaning effect can be achieved when the hot mist is selected for humidifying and liquefying the oil stain. When the range hood runs, if the spraying device 2 is in a working state, the liquid level detection device is always detecting, when the liquid level detection device detects that the liquid level in the containing part 23 is lower than the lowest liquid level value, the control device controls the alarm device to give an audible and visual alarm and controls the spraying device 2 to stop working, meanwhile, the control valve in the liquid injection pipe 24 is controlled to be opened, and the spraying liquid in the liquid supply device enters the containing part 23. When the liquid level in the accommodating part 23 is higher than the highest liquid level value, the control device controls the control valve to close, cuts off a fluid passage between the liquid supply device and the accommodating part 23, stops the supply of the spraying liquid, and controls the spraying device 2 to be opened for continuous work.

The centrifugal wind wheel 12 rotates continuously in the working process, the mist spraying liquid at the spraying position is liquefied by combining with the oil stain and then thrown into the volute through the centrifugal wind wheel 12 and flows into the oil cup 7 from the flow guide opening of the volute, or a flow guide pipe (not shown in the figure) is directly connected to the flow guide opening to guide the liquid oil stain flowing out of the volute into a sewer. After the user uses the range hood and closes the range hood, the centrifugal wind wheel 12 continuously operates for 2 to 3 minutes again, the water mist on the volute and the centrifugal wind wheel 12 is thrown out, the interior of the range hood is kept dry, and bacteria breeding is avoided.

The lampblack absorber in this application has increased spray set 2, can carry out the humidification liquefaction to the greasy dirt that gets into in the lampblack absorber use, avoids the greasy dirt to enter into the environment, can also avoid the greasy dirt to adhere to on centrifugal wind wheel 12, causes centrifugal wind wheel 12 weight gain, influences its operation.

The range hood in this application simple structure has effectively solved the drawback of current range hood in oil smoke purification treatment process, has strengthened the purifying effect of range hood greatly, has important meaning to energy saving and emission reduction. Simultaneously, because the greasy dirt is spraying in-process humidification liquefaction, can form liquid greasy dirt when the water smoke granule that condenses is more, can break away from centrifugal wind wheel 12 at centrifugal wind wheel 12 operation in-process or under self action of gravity, and then discharge the lampblack absorber, the user need not to wash centrifugal fan 11, has promoted user experience.

Those skilled in the art will readily appreciate that the above-described preferred embodiments may be freely combined, superimposed, without conflict.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art can make various modifications and variations. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. The utility model provides a range hood, includes fan and spray set, the fan includes the wind wheel, its characterized in that, spray set includes the portion of spraying, the portion of spraying is used for the orientation the wind wheel sprays.

2. The range hood according to claim 1, wherein the fan is a centrifugal fan, and the spraying part is arranged inside a centrifugal wind wheel of the centrifugal fan and/or at an air inlet of the centrifugal wind wheel and/or at an air outlet of the centrifugal wind wheel.

3. A range hood as claimed in claim 2, characterized in that the spray part comprises a ring spray pipe and/or a line spray pipe.

4. A range hood as claimed in claim 3, wherein the spraying part is provided with a spraying port,

5. A range hood as claimed in claim 4, wherein the spray opening is provided with a high pressure atomizing nozzle.

6. A range hood according to claim 3, characterized in that the shower portion is provided inside the centrifugal wind wheel,

7. The range hood according to claim 6, wherein the annular shower pipe is coaxially arranged with the centrifugal fan, and the annular shower pipe is arranged in the middle of the centrifugal wind wheel in the axial direction; or,

8. A range hood as claimed in any one of claims 2 to 7, wherein a flow guide opening is provided on the volute of the centrifugal fan, and the flow guide opening is used for discharging the liquid in the volute out of the volute.

9. A range hood as claimed in any one of claims 2 to 7, wherein the spray arrangement comprises a draft tube, a first end of the draft tube being connected to the spray section, the draft tube being adapted to direct spray into the spray section.

10. A range hood as claimed in claim 9, comprising a mounting plate, wherein the inlet end of the volute of the centrifugal fan is fixedly arranged on the mounting plate, the first end of the drainage tube passes through the mounting plate from the inner side of the mounting plate and bends towards the centrifugal wind wheel, so that the spraying part is positioned inside the centrifugal wind wheel of the centrifugal fan and/or at the air inlet of the centrifugal wind wheel.

11. A range hood as set forth in claim 9, wherein said spray device comprises a receiving portion for receiving the liquid, the second end of said drain tube is connected to said receiving portion, and a liquid level detecting device is disposed in said receiving portion for detecting the liquid level in said receiving portion.

12. A range hood as claimed in claim 11, comprising an alarm device connected to the level detection device for alarming when the level in the receiving portion is below a minimum level value.

13. A range hood as claimed in claim 11, wherein the receiving portion includes a receiving chamber, the receiving chamber communicates with the second end of the draft tube, and a heating device is disposed in the receiving chamber for heating the liquid in the receiving chamber.

14. A range hood as claimed in claim 11, wherein the receiving part is provided with a liquid injection opening which is closed by a liquid injection plug and through which water and/or cleaning agent can be injected into the receiving part; and/or the presence of a gas in the gas,

15. A range hood as set forth in claim 11, wherein the spraying means includes a liquid injection pipe, the receiving part is provided with a liquid injection port, one end of the liquid injection pipe is communicated with the liquid injection port of the receiving part, the other end of the liquid injection pipe is communicated with the liquid supply means, the liquid injection pipe is provided with a control valve for controlling the on-off state of the liquid injection pipe.