CN213421210U - Fume exhaust fan - Google Patents

Abstract

The utility model discloses a range hood relates to range hood technical field for improve range hood hold together the cigarette effect. The range hood comprises a smoke collecting hood and an air curtain device. This air curtain device locates the corner at collection petticoat pipe front edge, and the air curtain device has the air outlet of downward air-out, and the air outlet includes the side air outlet along collection petticoat pipe side edge setting and along the preceding air outlet of the preceding edge setting of collection petticoat pipe, the side air outlet with preceding air outlet connects into L shape air outlet.

Description

Fume exhaust fan

Technical Field

The utility model relates to a range hood technical field especially relates to a range hood.

Background

The range hood is a kitchen appliance for purifying the kitchen environment, is usually arranged above a kitchen stove, and can rapidly exhaust waste burnt by the kitchen stove and oil fume harmful to human bodies generated in the cooking process and discharge the waste and the oil fume to the outside, thereby reducing the pollution of a kitchen, purifying the air in the kitchen, and having the safety guarantee effects of gas defense and explosion prevention.

Because present range hood gather together the cigarette effect not good, consequently, can appear the oil smoke when the lampblack absorber sucks the oil smoke and overflow or follow the excessive phenomenon in the corner of collection petticoat pipe front edge from the front edge of collection petticoat pipe, lead to the oil smoke can contact the user, influence user's use and experience. In order to improve the smoke collecting effect of the range hood, some range hoods are provided with air curtain devices. The air curtain device can generate an air curtain at the front edge of the range hood. The air curtain can prevent the oil smoke from overflowing from the front edge of the smoke collecting hood, so that the oil smoke is concentrated in a negative pressure area of the range hood, and the smoke collecting effect of the range hood can be improved.

However, the oil smoke still overflows from the corner of the front edge of the smoke collecting cover, so that the smoke collecting effect of the range hood is still poor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a range hood for improve range hood hold together the cigarette effect.

In order to achieve the purpose, the utility model provides a range hood. The range hood comprises a smoke collecting hood and an air curtain device. Wherein, the air curtain device is located the corner at collection petticoat pipe front edge, just the air curtain device has the air outlet of air-out downwards, the air outlet includes the edge the side air outlet that collection petticoat pipe side edge set up with the edge the preceding air outlet that collection petticoat pipe's front edge set up, the side air outlet with preceding air outlet connects into L shape air outlet.

Compared with the prior art, the utility model provides an among the range hood, the corner of collection petticoat pipe front side is located to the air curtain device, and the air curtain device has the air outlet of downward air-out for the air curtain device during operation can form the air curtain in the below of collection petticoat pipe through the air outlet. Meanwhile, the air outlet of the air curtain device comprises a side air outlet arranged along the side edge of the smoke collecting hood and a front air outlet arranged along the front edge of the smoke collecting hood, and the side air outlet and the front air outlet are connected to form an L-shaped air outlet. At this moment, the air curtain of L shape can enough prevent that the oil smoke from overflowing along the preceding edge of collection petticoat pipe and the side edge of collection petticoat pipe to can prevent that the oil smoke from overflowing from the corner of collection petticoat pipe leading edge, make the oil smoke can concentrate on the negative pressure region of lampblack absorber, thereby can improve gathering together cigarette effect of lampblack absorber.

Drawings

The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:

fig. 1 is a schematic structural diagram of a range hood in the related art;

fig. 2 is a schematic structural diagram of a range hood provided in the present application;

fig. 3 is a top view of a range hood provided herein;

fig. 4 is a schematic structural diagram of an air curtain device in the range hood provided by the present application;

fig. 5 is a bottom view of an L-shaped air duct in the range hood provided by the present application;

fig. 6 is a schematic structural diagram of a smoke collecting hood in the range hood provided by the present application;

fig. 7 is a top view of an L-shaped air duct in the range hood provided in the present application;

fig. 8 is a cross-sectional view of an L-shaped air duct in the range hood provided by the present application;

fig. 9 is a left side view of an L-shaped air duct in the range hood provided by the present application;

fig. 10 is a right side view of an L-shaped air duct in the range hood provided by the present application;

fig. 11 is a front view of an L-shaped air duct in the range hood provided by the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

The range hood is an electric appliance for kitchen for purifying kitchen environment. The exhaust ventilator is arranged above a kitchen range, and can rapidly exhaust waste gas generated by combustion of the range and oil smoke harmful to human bodies generated in the cooking process, so that indoor air pollution can be reduced, air is purified, and the exhaust ventilator has the safety guarantee effects of gas defense and explosion prevention.

The process of the range hood for sucking the oil smoke completely follows the principle of air hydrodynamics: in two adjacent space regions, as long as there is a pressure difference, the gas flows from a place where the pressure is high to a place where the pressure is low. When the range hood is in a working state, air in the range hood is discharged outdoors, so that a negative pressure area is formed in the range hood, and the pressure difference between the negative pressure area and the surrounding area is large. At this time, the cooking fume is sucked into the range hood by the negative pressure region in the process of rising, so that the indoor air can be purified.

Based on this, referring to fig. 1, the range hood includes a frame 100, a fan assembly 200, a smoke exhaust assembly 300, and a smoke collection hood 400.

The housing 100 has a hollow rectangular parallelepiped shape, and one side wall of the housing 100 is fixedly coupled to a wall of a kitchen so that the housing 100 can be mounted on the wall of the kitchen.

The blower assembly 200 is disposed in the rack 100 to draw air in the rack 100 to the outside, thereby forming a negative pressure region in the rack 100.

Go out cigarette subassembly 300, it locates the top of frame 100 to go out cigarette subassembly 300, and goes out the formation in cigarette subassembly 300 and go out the cigarette flue, goes out the one end of cigarette flue and the inner chamber intercommunication of frame 100, goes out the other end and public flue or outdoor intercommunication of cigarette flue.

The smoke collecting cover 400 is arranged below the machine frame 100, a smoke channel is formed in the smoke collecting cover 400 in an enclosing mode, the first end of the smoke channel is of an open structure, and the first end of the smoke channel is located right above a kitchen ware in a kitchen. The second end of the oil smoke passage is communicated with the inner cavity of the machine frame 100.

When the range hood is required to suck oil smoke, the fan assembly 200 is controlled to suck air in the inner cavity of the rack 100 to a common flue or outdoors through the smoke outlet duct, so that a negative pressure region is formed in the inner cavity of the rack 100. At this time, the cooking oil smoke generated by cooking enters the oil smoke channel through the first end of the oil smoke channel under the suction of the negative pressure region, and then enters the inner cavity of the rack 100 from the second end of the oil smoke channel, so that the fan assembly 200 sucks the oil smoke in the inner cavity of the rack 100 to the public flue or outdoors through the smoke outlet duct.

However, when the cooking fume is relatively large, the fume overflowing phenomenon may occur at the front edge of the fume collecting cover 400 or the corner of the front edge of the fume collecting cover 400, resulting in a poor fume collecting effect of the range hood.

In the prior art, in order to improve the smoke collecting efficiency of the range hood, an air curtain device is generally arranged on the smoke collecting cover 400 and is located on the front side edge of the smoke collecting cover 400. The air curtain device has an air outlet for discharging air downward, and the air outlet is provided along the front side edge of the smoke collecting cover 400. When the air curtain device 500 works, the air outlet of the air curtain device can blow air downwards, and a downward air curtain is formed at the front side of the smoke collecting hood 400. The air curtain can block the oil smoke from overflowing from the front side of the smoke collecting cover 400, so that the oil smoke is concentrated in the negative pressure area of the smoke collecting cover 400, and the smoke collecting effect of the smoke collecting cover 400 can be improved. However, the air curtain formed by the air curtain device in the prior art cannot prevent the oil smoke from overflowing from the corner of the front side of the smoke collecting hood 400, so that the smoke collecting effect of the range hood is still poor.

In order to improve the smoke collecting effect of the range hood, the utility model provides a range hood. Fig. 2 shows a schematic structural diagram of a range hood provided by an embodiment of the present invention. Fig. 3 shows a top view of the range hood provided by the embodiment of the present invention. Fig. 4 shows a schematic structural diagram of an air curtain device 500 in a range hood provided by an embodiment of the present invention. Fig. 5 shows a bottom view of the air curtain pipeline in the range hood provided by the embodiment of the present invention. Referring to fig. 2 to 5, the range hood includes a smoke collecting hood 400 and a wind curtain device 500. The wind curtain device 500 is disposed at a corner of the front edge of the smoke collecting hood 400, and the wind curtain device 500 has a wind outlet for discharging wind downwards. The air outlets include side air outlets 512 along the side edges of the fume collecting hood 400 and front air outlets 511 along the front edges of the fume collecting hood 400. At this time, when the smoke collecting cover 400 works, the side air outlet 512 of the smoke collecting cover 400 can be blown downwards to form a side air curtain, so that the oil smoke can be prevented from overflowing from the side edge of the smoke collecting cover 400. Meanwhile, the front air outlet 511 of the smoke collecting cover 400 can be blown out downwards to form a front air curtain, so that the oil smoke can be prevented from overflowing from the front edge of the smoke collecting cover 400. The side air outlet 512 and the front air outlet 511 are connected to form an L-shaped air outlet 510, so that the front air curtain and the side air curtain can be connected to each other to form an L-shaped air curtain, and the L-shaped air curtain can block the oil smoke from overflowing from the corner of the front edge of the smoke collection cover 400.

Known by above-mentioned range hood's structure and range hood's theory of operation, the embodiment of the utility model provides an among the range hood, the air outlet of air curtain device 500 includes along the side air outlet 512 that the collection petticoat pipe 400 side set up and along the preceding air outlet 511 that the front edge of collection petticoat pipe 400 set up, and side air outlet 512 and preceding air outlet 511 connect and form L shape air outlet 510, make air curtain device 500 during operation can form L shape air curtain in the below of collection petticoat pipe 400, L shape air curtain can prevent that the oil smoke from the front edge of collection petticoat pipe 400, the side edge of collection petticoat pipe 400 spills over with the corner on collection petticoat pipe 400 front edge, thereby can make the oil smoke concentrate on the negative pressure region of collection petticoat pipe 400, and then can improve range hood.

Generally, the installation position of the air curtain device 500 may be selected according to actual conditions. For example, the air curtain device 500 may be installed on an outer sidewall of the smoke collecting hood 400, and the front outlet 511 of the air curtain device 500 may be attached to a sidewall of a front edge of the smoke collecting hood 400, and the side outlet 512 of the air curtain device 500 may be attached to an outer wall of a side edge of the smoke collecting hood 400. Of course, the air curtain device 500 may be disposed on the side wall of the smoke exhaust channel of the smoke collecting hood 400, and the front air outlet 511 of the air curtain device 500 may be attached to the inner wall of the front edge of the smoke collecting hood 400, and the side air outlet 512 of the air curtain device 500 may be attached to the inner wall of the side edge of the smoke collecting hood 400.

As an embodiment of the present invention, referring to fig. 2 to 6, an accommodating chamber 410 with an upper opening isolated from the oil smoke channel of the exhaust fume collecting cover 400 is formed in the exhaust fume collecting cover 400, an air inlet and an avoiding opening of the exhaust fume collecting cover are formed on the exhaust fume collecting cover 400, and the air inlet and the avoiding opening of the exhaust fume collecting cover are communicated with the accommodating chamber 410. The avoiding port is arranged on the bottom plate of the smoke collecting cover 400. The air curtain device 500 is located in the accommodating cavity 410, and the avoiding opening is used for avoiding the L-shaped air outlet 510 of the air curtain device 500. At this time, the fume collecting hood inlet can make the air in the accommodating chamber 410 enter into the fume collecting hood 400, so that an adequate air source can be provided for the air curtain device 500. The avoiding port is located at the bottom of the accommodating cavity 410 and is used for avoiding the L-shaped air outlet 510 of the air curtain device 500, so that the L-shaped air curtain formed by downward air outlet of the L-shaped air outlet 510 of the air curtain device 500 can pass through the air curtain device 500, an even and stable L-shaped air curtain is formed below the smoke collecting hood 400, and the range hood is guaranteed to have a better smoke collecting effect. Meanwhile, the air curtain device 500 is disposed in the accommodating chamber 410 of the smoke collecting cover 400, so that the smoke collecting cover 400 can protect the air curtain device 500 and prevent the air curtain device 500 from being polluted by oil smoke or dust. Moreover, the air curtain device 500 does not increase the area of the range hood, so that the range hood is ensured to occupy a smaller space and also has a better smoke collecting effect. The air curtain device 500 does not affect the smoke inlet path of the oil smoke channel of the smoke collection cover 400, and ensures the smoke suction efficiency of the range hood.

Specifically, in order to avoid the oil smoke of the smoke collection hood 400 from entering the accommodating chamber 410 through the smoke collection hood air inlet, the smoke collection hood air inlet is located on the top plate of the smoke collection hood 400, so that the oil smoke can be prevented from entering the smoke collection hood 400, and the air curtain formed by the L-shaped air outlet 510 of the air curtain device 500 does not contain the oil smoke, so that the user has better use experience.

For example, referring to fig. 2 to 5, the air curtain apparatus 500 includes a fan 520 and an air curtain duct 530, the air curtain duct 530 includes a side duct 532 disposed along a side edge of the smoke collecting hood 400 and a front duct 531 disposed along a front edge of the smoke collecting hood 400, and the side duct 532 and the front duct 531 are connected to form the air curtain duct 530. The side air outlet 512 is disposed at the bottom of the side duct 532, so that the side air outlet 512 is disposed along the side edge of the exhaust fume collecting cover 400, and the side air outlet 512 is disposed to discharge air downwards to form a side air curtain. The front air outlet 511 is disposed at the bottom of the front duct 531, so that the front air outlet 511 can be disposed along the front edge of the smoke collecting cover 400, and the front air outlet 511 can discharge air downwards to form a front air curtain. The air inlet of the air curtain pipeline 530 is communicated with the air outlet of the fan 520, so that the fan 520 can compress the air in the accommodating chamber 410 of the smoke collecting hood 400, and then the air flows in the air curtain pipeline 530 can be discharged downwards through the L-shaped air outlet 510 of the air curtain device 500 to form an L-shaped air curtain by entering the air outlet of the fan 520 and the air curtain air inlet into the pipeline of the air curtain.

For example, referring to fig. 2 to 7, in order to ensure that the L-shaped air outlet 510 of the air curtain device 500 can form a more uniform and stable L-shaped air curtain below the smoke collecting hood 400, and prevent the air entering the air curtain duct 530 from directly flowing out from the L-shaped air outlet 510 near the air inlet, so that the L-shaped air outlet 510 is far away from the air inlet and cannot flow downward to form an air curtain, thereby causing the air curtain formed by the air flowing out from the L-shaped air outlet to be uneven, a baffle 540 extending along the air curtain duct 530 is disposed in the air curtain duct 530, a bottom of the baffle 540 is connected to a bottom surface of the air curtain duct 530, a gap is formed between a top of the baffle 540 and a top surface of the air curtain duct 530, and the L-shaped air outlet 510 is located between the baffle 540 and the first side wall 533 of the air curtain duct 530. At this time, when the air compressed by the fan 520 enters the air curtain pipeline 530, the air can be firstly stored and accumulated in the air curtain pipeline 530, after the air volume accumulated in the air curtain pipeline 530 exceeds the height of the baffle 540, the air flow in the air curtain pipeline 530 can be accelerated by the passage between the baffle 540 and the first side wall 533 of the air curtain pipeline 530 through the gap between the top of the baffle 540 and the top surface of the air curtain pipeline 530 under the action of the air pressure in the air curtain pipeline 530, and then the air flow is discharged through the L-shaped air outlet 510 of the air curtain device 500, so that a more uniform and stable air curtain can be obtained.

It should be noted that the baffle 540 may be a plate separately added to the air duct 530, or may be formed by bending the bottom of the air curtain duct 530 upward.

Specifically, the distance between the baffle 540 and the first sidewall 533 of the air curtain duct 530 is 1mm to 4.5 mm. At this time, the channel between the baffle 540 and the first sidewall 533 of the air curtain duct 530 can further increase the air outlet speed of the air curtain air outlet, and further can further increase the uniformity and stability of the air curtain.

Meanwhile, the ratio of the height of the air curtain housing to the height of the baffle 540 is 1.3: 1.9. At this time, sufficient air flow can be accumulated in the air curtain pipeline 530, so that uniformity and stability of the air curtain formed by downward air outlet of the air curtain air outlet can be further ensured.

Specifically, referring to fig. 2 to 11, two L-shaped air deflectors 550 are disposed on the outer wall of the air curtain duct 530, and the two L-shaped air deflectors 550 are respectively located at two sides of the L-shaped air outlet 510. At this time, the air curtain formed by downward air outlet through the L-shaped air outlet 510 can be guided under the action of the two L-shaped air deflectors 550, so as to further ensure the uniformity and stability of the L-shaped air curtain.

The distance between the two L-shaped air deflectors 550 can be selected according to actual situations, as long as the two L-shaped air deflectors 550 can guide the air curtain formed by the L-shaped air outlet 510. For example, the distance between the two L-shaped air deflectors 550 is 1mm to 2 mm.

Meanwhile, the length of the two L-shaped air deflectors 550 extending downwards can be selected according to actual situations. In the embodiment of the present invention, the air deflectors 550 of the two L shapes extend out of the accommodating cavity 410 through avoiding the opening, and the lower edges of the air deflectors 550 of the two L shapes are flush with the lower edge of the smoke collecting hood 400, so that the air deflectors 550 of the two L shapes have better guiding effect on the L-shaped air curtain.

As an embodiment, referring to fig. 4, the air inlet of the L-shaped air duct has a reduced structure. The throat structure can lead the air current that gets into to L shape wind channel for the air current that gets into in the L shape wind channel can spread along the angle of throat structure, thereby can shorten the air-out blind area between L shape air outlet 510 and the air curtain device 500 air intake, further improves the homogeneity of the L shape air curtain that L shape air outlet 510 air-out formed downwards.

Specifically, the angle of the throat of the air intake in L shape wind channel can be selected according to actual conditions, the embodiment of the utility model provides an in the L shape wind channel, the angle of the throat of the air intake in L shape wind channel is 5 ~ 20.

As an embodiment, referring to fig. 2 to 4, the air curtain device 500 further includes a speed adjusting pipe 560, an air inlet of the air curtain device 500 is communicated with an air outlet of the fan 520 through the speed adjusting pipe 560, and a cross-sectional area of the speed adjusting pipe 560 is gradually reduced along an extending direction of the speed adjusting pipe 560, so that the speed adjusting pipe 560 can accelerate and pressurize an air flow formed at the air outlet of the fan 520, thereby increasing an air pressure and an air speed entering the air curtain pipe 530, and improving a working efficiency of the air curtain device 500.

Specifically, referring to fig. 2 to 11, the air curtain device 500 further includes a rectifying duct 570, the speed adjusting duct 560 is communicated with the air inlet of the air curtain device 500 through the rectifying duct 570, and a cross-sectional area of the rectifying duct 570 is constant along an extending direction of the rectifying duct 570. At this time, the rectifying pipe 570 can rectify the accelerated and pressurized air flow, thereby preventing the air flow entering the air curtain pipe 530 from leading the air in the pipe to move, ensuring the stability of the air flow in the air curtain pipe 530, and further improving the stability of the air curtain formed by the L-shaped air outlet 510.

Specifically, referring to fig. 4, the air curtain device 500 of the embodiment of the present invention further includes an anion generator 580, and the anion generator 580 is installed in the speed adjusting pipe 560. The negative ion generator 580 can generate negative ions from the air flowing through the speed-adjusting pipe 560, so that the air flowing into the air curtain pipe 530 has negative ions, and further the air flowing out from the L-shaped air outlet 510 can form an air curtain with negative ions, thereby purifying the air.

As an example, referring to fig. 3, the range hood includes two sets of air curtain devices 500, and the L-shaped air outlets 510 of the two sets of air curtain devices 500 are symmetrically distributed along the front side of the smoke collecting hood 400. That is, of the two air curtain devices 500, the first air curtain device 500 is provided at the left corner of the front edge of the smoke collecting hood 400, and the side outlet 512 of the L-shaped outlet 510 of the first air curtain device 500 is located along the left edge of the smoke collecting hood 400. The second air curtain device 500 is located at a right corner of the front edge of the collection hood 400, and the side outlet 512 of the L-shaped outlet 510 of the second air curtain device 500 is provided along the right edge of the collection hood 400. At this moment, the left side corner and the right side corner on the front edge of collection petticoat pipe 400 all establish L shape air outlet 510 for two air curtain devices 500 during simultaneous operation can prevent that the oil smoke from overflowing from the left side edge of collection petticoat pipe 400, the right side edge of collection petticoat pipe 400, the front edge of collection petticoat pipe 400, the left side corner on collection petticoat pipe 400 front edge and the right side corner on collection petticoat pipe 400 front edge, and then can further improve range hood's the cigarette effect that gathers together.

Specifically, in order to further prevent the oil smoke from overflowing from the front edge of the smoke collecting hood 400, the front outlet 511 of the L-shaped outlet 510 of the first air curtain device 500 is connected with the front outlet 511 of the L-shaped outlet 510 of the second air curtain device 500. At this time, the front air outlets 511 of the two air curtain devices 500 are connected, so that the front air curtains formed by the front air outlets 511 of the two air curtain devices 500 can be connected with each other, the oil smoke can be prevented from overflowing between the two front air curtains, and the smoke collecting effect of the range hood can be further improved.

In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (14)

1. A range hood, comprising:

a smoke collecting hood;

the air curtain device, the air curtain device is located the corner at collection petticoat pipe front edge, just the air curtain device has the air outlet of downward air-out, the air outlet includes the edge the side air outlet and the edge that collection petticoat pipe side edge set up the preceding air outlet that the front edge of collection petticoat pipe set up, the side air outlet with preceding air outlet connects into L shape air outlet.

2. The range hood according to claim 1, wherein a housing chamber isolated from a soot passage of the soot collecting hood is formed in the soot collecting hood, a soot collecting hood air inlet and a dodging port are formed in the soot collecting hood, and both the soot collecting hood air inlet and the dodging port are communicated with the housing chamber; the avoiding port is arranged on the bottom plate of the smoke collecting hood; the air curtain device is located in the accommodating cavity, and the avoiding port is used for avoiding the L-shaped air outlet of the air curtain device.

3. The range hood of claim 2, wherein the air curtain device comprises a fan and air curtain pipelines, the air curtain pipelines comprise side pipelines arranged along the side edge of the fume collecting hood and front pipelines arranged along the front edge of the fume collecting hood, and the side pipelines and the front pipelines are connected into an L-shaped pipeline; the side air outlet is arranged at the bottom of the side pipeline, and the front air outlet is arranged at the bottom of the front pipeline; and the air inlet of the air curtain pipeline is communicated with the air outlet of the fan.

4. The range hood of claim 3, wherein a baffle plate extending along the air curtain duct is arranged in the air curtain duct, the bottom of the baffle plate is connected with the bottom surface of the air curtain duct, and a gap is formed between the top of the baffle plate and the top surface of the air curtain duct; the L-shaped air outlet is positioned between the baffle and the first side wall of the air curtain pipeline.

5. The range hood of claim 4, wherein the distance between the baffle and the first side wall of the air curtain duct is 1mm to 4.5 mm.

6. The range hood of claim 4, wherein the ratio of the height of the air curtain duct to the height of the baffle is 1.3-1.9.

7. The range hood of claim 4, wherein two L-shaped air deflectors are arranged on the outer wall of the air curtain duct, and the two L-shaped air deflectors are respectively positioned on two sides of the L-shaped air outlet.

8. The range hood of claim 7, wherein the distance between the two air deflectors is 1 mm-2 mm.

9. The range hood according to claim 7, wherein the two air deflectors extend out of the accommodating cavity through the avoiding opening, and lower edges of the two air deflectors are flush with lower edges of the smoke collecting hood 400.

10. The range hood of any one of claims 3 to 9, wherein the air inlet of the air curtain device is of a throat structure.

11. The range hood according to any one of claims 3 to 9, wherein the air curtain device further comprises a speed regulation pipeline, an air inlet of the air curtain device is communicated with an air outlet of the fan through the speed regulation pipeline, and the cross-sectional area of the speed regulation pipeline is gradually reduced along the extension direction of the speed regulation pipeline.

12. The range hood of claim 11, wherein the air curtain device further comprises a rectifying duct, the speed adjusting duct is communicated with the air inlet of the air curtain device through the rectifying duct, and the cross-sectional area of the rectifying duct is kept constant along the extending direction of the rectifying duct.

13. The range hood of claim 12, wherein the air curtain device further comprises an anion generator, and the anion generator is mounted in the speed adjusting pipe.

14. The range hood according to any one of claims 1 to 9, wherein the range hood comprises two sets of the air curtain devices, and the L-shaped air outlets of the two sets of the air curtain devices are symmetrically distributed along the front edge of the fume collecting hood.

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