CN211952870U - Range hood with central air curtain and side air curtain - Google Patents

Abstract

The utility model discloses a range hood with a central air curtain and a side air curtain, which comprises a smoke collecting hood and an air box device, wherein the smoke collecting hood is provided with a smoke inlet part and a smoke guide part positioned below the smoke inlet part, the bottom of the smoke inlet part is provided with a smoke inlet area, the top of the smoke inlet part is provided with a smoke outlet, a vertical central air passage which divides the smoke guide surface into two parts and vertical side air passages positioned at the left side and the right side of the smoke guide surface are convexly arranged on the smoke guide surface at the front of the smoke guide part, two opposite side walls of the central air passage are rotational flow surfaces, the central air passage is provided with at least one row of first exhaust holes, and the side air passages are; the air box device comprises a box body and a fan assembly arranged in the box body, and an air outlet of the fan assembly is respectively communicated with a smoke exhaust pipeline of the range hood, a central air passage and two side air passages. The utility model discloses a range hood can form central air curtain and crosswind curtain to form the spiral air current that makes progress under the cooperation of bellows device and whirl face, prevent that the oil smoke diffusion from escaping, reach the high efficiency and hold together cigarette smoking effect.

Description

Range hood with central air curtain and side air curtain

Technical Field

The utility model relates to a range hood technical field especially relates to a range hood's rotatory smoking technique.

Background

The range hood is a main tool for collecting oil smoke in a kitchen, and how to improve the suction efficiency of the range hood is always important for the design and research of the range hood. When the traditional range hood inhales, the air suction range is a hemispherical area, and air in all directions is sucked indiscriminately. In this air suction mode, the air flow rate is larger at a position close to the air suction port, and the air flow rate is rapidly reduced at a position far away from the air suction port as the distance from the air suction port increases. Therefore, the air speed at the lowest part of the air suction port is reduced, which results in insufficient upward suction force, and the range hood is easily interfered by external factors, such as people walking, fan or cold air running, etc., and disturbed airflow factors are easily influenced, so that oil smoke or pollutants are dissipated along with the disturbed airflow, and the range hood has poor smoke collection and smoking effects.

Disclosure of Invention

The utility model discloses aim at solving one of the problems that exist among the prior art to a certain extent at least, for this reason, the utility model provides a take range hood of center gas curtain and side gas curtain, it can form unique spiral air current that makes progress, prevents that the oil smoke diffusion from escaping, reaches the high efficiency and holds together cigarette and rotatory smoking effect.

According to the range hood that provides a take center air curtain and side air curtain, it realizes through following technical scheme:

a range hood with a central air curtain and a side air curtain comprises a fume collecting hood and a bellows device, wherein the fume collecting hood is provided with a fume inlet part and a fume guide part positioned below the fume inlet part, the bottom of the smoke inlet part is provided with a smoke inlet area, the top of the smoke inlet part is provided with a smoke outlet, the air box device comprises a box body and a fan component arranged in the box body, the box body is arranged at the top of the smoke collecting hood and is communicated with the smoke outlet, wherein the smoke guide surface on the front surface of the smoke guide part is convexly provided with a vertical central air passage which divides the smoke guide surface into two parts and vertical side air passages which are positioned at the left side and the right side of the smoke guide surface, the two opposite side walls of the central air passage are rotational flow surfaces for enabling air flow passing through the central air passage to rotate, the central air passage is provided with at least one row of first exhaust holes which are vertically arranged and can exhaust air forwards, and each side air passage is provided with one row of second exhaust holes which are vertically arranged and can exhaust air towards the rotational flow surfaces; and the air outlet of the fan assembly is communicated with the smoke exhaust pipeline of the range hood, the central air passage and the two side air passages respectively and is used for conveying air to the first exhaust hole and the second exhaust hole.

In some embodiments, the central air passage extends from the bottom of the smoke guide portion to the bottom surface of the smoke inlet portion and divides the smoke inlet area into two parts, the side wall of the central air passage or the rotational flow surface is an inclined surface or an arc surface extending from the front surface of the smoke guide portion to the first exhaust hole, and the cross sectional area of the inclined surface or the arc surface in the horizontal direction is linearly increased from bottom to top.

In some embodiments, the arc surface is curved toward the inside of the central air passage or the outside of the side wall of the central air passage, and the arc length of the arc surface in any horizontal section is a quarter of an arc.

In some embodiments, a transition surface is arranged between two opposite side walls of the central air passage, the transition surface is arranged from bottom to top and inclines forwards, and at least one row of first exhaust holes which are vertically arranged and emit air forwards are arranged on the transition surface.

In some embodiments, the transition surface is a forward-facing and outward-curved arc surface, and a row of the first exhaust holes which are vertically arranged and are exhausted forward are arranged on the arc surface; or the transition surface is a plane, and the left side and the right side of the plane are respectively provided with a row of first exhaust holes which are vertically arranged and give out air forwards.

In some embodiments, the distance L between the side air passage and the front face of the smoke guide portion is smaller than the minimum distance L between the central air passage and the front face of the smoke guide portion, and a row of second exhaust holes which are vertically arranged and face the cyclone surface are arranged on the side wall of the side air passage.

In some embodiments, the exhaust hood further comprises a ventilation duct, one end of the ventilation duct is arranged in the box body and communicated with the air outlet of the fan assembly, and the other end of the ventilation duct is arranged in the exhaust fume collecting hood and communicated with the central air duct and the two side air ducts respectively.

In some embodiments, be equipped with the opening on fan subassembly's the gas outlet lateral wall, air pipe includes the air inlet section, the air inlet section set up in the box and its facing open-ended position department is equipped with the extension of outwards giving prominence to the extension bottom surface is equipped with the air inlet entry, the extension passes stretch into behind the opening the gas outlet the inside, the air inlet entry orientation fan subassembly's the direction of giving vent to anger is arranged.

In some embodiments, the ventilation duct further includes an air outlet section disposed in the smoke collecting cover, an air inlet outlet of the air inlet section extends downwards to the inside of the smoke collecting cover, and the air outlet section is communicated with the air inlet outlet of the air inlet section, the central air passage and the two side air passages respectively.

In some embodiments, the central air passage has a left air supply passage and a right air supply passage which are independent from each other, and the front surfaces of the left air supply passage and the right air supply passage are respectively provided with a row of the first exhaust holes which are vertically arranged and exhaust air forwards; the air-out section includes left air-out section and right air-out section independent each other, left side air-out section respectively with the air inlet outlet of air inlet section, lean on a left side the side air flue left side air supply channel intercommunication, right side air-out section respectively with the air inlet outlet of air inlet section, lean on the right side the side air flue right side air supply channel intercommunication.

Compared with the prior art, the utility model discloses an at least including following beneficial effect:

1. the utility model discloses a range hood, it improves fan subassembly utilization ratio through using partial air current that flows out from the air outlet of fan subassembly for providing the air supply to central air flue and side air flue;

2. the gas sprayed from the central air passage can form a central air curtain, and unique spiral upward airflow is formed by the cooperation of the air box device, the central air curtain and the rotational flow surface of the central air passage, so that the oil smoke is prevented from diffusing and escaping, and the effects of high-efficiency smoke collection and rotary smoking are achieved;

3. the gas sprayed out through the side air channel can form a side air curtain which is discharged towards the rotational flow surface, and the rotary smoke suction effect can be further enhanced.

Drawings

Fig. 1 is a schematic structural diagram of a range hood in embodiment 1 of the present invention;

fig. 2 is a bottom view of the range hood in embodiment 1 of the present invention;

fig. 3 is an exploded view of the range hood according to embodiment 1 of the present invention, in which a back plate of a smoke collecting hood is hidden;

fig. 4 is a sectional view of the range hood in embodiment 1 of the present invention;

fig. 5 is a schematic structural diagram of an air intake section in embodiment 1 of the present invention.

Detailed Description

The present invention is illustrated by the following examples, but the present invention is not limited to these examples. To the embodiment of the present invention, modify or replace some technical features, without departing from the spirit of the present invention, it should be covered in the technical solution scope of the present invention.

Example 1

As shown in fig. 1-2, the range hood with the central air curtain and the side air curtain of the present embodiment includes a smoke collecting hood 1 and a wind box device 2, the smoke collecting hood 1 has a smoke inlet 11 and a smoke guide 12 located below the smoke inlet 11, a smoke inlet area 111 is provided at the bottom of the smoke inlet 11, a smoke outlet 112 is provided at the top, a vertical central air passage 4 dividing the smoke guide 121 into two parts and vertical side air passages 5 located at the left and right sides of the smoke guide 121 are convexly provided on the smoke guide 121 on the front surface of the smoke guide 12, two opposite side walls of the central air passage 4 are rotational flow surfaces 41 for rotating the air flow flowing through the central air passage 4, the central air passage 4 is provided with at least one row of first air vents 401 vertically arranged and emitting air forward, and the air flow ejected from the first air vents 401 forms a central air curtain capable of driving the peripheral air flow to flow. Every side air flue 5 is equipped with one row of vertical arrangement and the second exhaust hole 501 of giving vent to anger towards whirl face 41, and the air current formation of following second exhaust hole 501 blowout can drive the side air curtain that peripheral air current flows, turns the rotation after leading smoke surface 121 flow direction whirl face 41 along the air current when giving vent to anger towards whirl face 41, strengthens rotatory air current intensity. The bellows device 2 comprises a box body 21 and a fan assembly 22, the box body 21 is arranged at the top of the fume collecting hood 1 and communicated with the fume outlet 112, the fan assembly 22 is arranged in the box body 21 and used for sucking fume and forming upward axial suction to the cyclone gas, and the gas outlet 221 of the fan assembly 22 is respectively communicated with a fume exhaust pipeline of the range hood, a central gas passage 4 and two side gas passages 5 and used for conveying gas to the first exhaust hole 401 and the second exhaust hole 501. Preferably, the fan assembly 22 is a volute fan assembly.

When the range hood works, the fan assembly 22 of the bellows device 2 is started, and the upward axial suction force generated by the fan assembly 22 drives the external airflow and the oil smoke to flow into the smoke inlet portion 11 of the smoke collection cover 1 from the smoke inlet region 111, enter the fan assembly 22 of the bellows device 2 through the smoke outlet 112, and then flow through the smoke exhaust pipeline of the range hood from the air outlet 221 of the fan assembly 22 and exhaust the smoke out of the room. When airflow flows through the air outlet 221 of the fan assembly 22, part of the airflow flows into the central air passage 4 and the two side air passages 5 and is further ejected from the first exhaust hole 401 and the second exhaust hole 501, due to the gas viscosity effect, the gas ejected from the first exhaust hole 401 forms a central air curtain, oil smoke can be cut into different areas, peripheral airflow can be driven to flow together and generate radial force, the airflow forms rotational flow gas under the matching action of the rotational flow surface 41, and spiral upward airflow is formed under the matching of upward axial suction generated by the fan assembly 22, so that the oil smoke is upwards and spirally sucked and gathered before being diffused, the oil smoke is prevented from being diffused and escaping, and the rotary smoking effect is improved; the gas ejected from the second exhaust hole 501 can form a side air curtain which is discharged towards the cyclone surface 41, and the airflow turns and rotates to form cyclone after flowing to the cyclone surface 41 along the smoke guide surface 121, so that the strength of the rotating airflow is further enhanced, and the high-efficiency smoke gathering and rotating smoking effects are enhanced.

The range hood with the central air curtain and the side air curtain of the embodiment provides an air source for the first exhaust hole 401 of the central air passage 4 and the second exhaust hole 501 of the side air passage 5 through a part of air flow flowing out of the air outlet 221 of the fan assembly 22, so that the utilization rate of tail gas is improved. In addition, the gas ejected from the first exhaust hole 401 of the central air passage 4 can form a central air curtain, and the unique spiral upward airflow is formed by the cooperation of the air box device 2, the central air curtain and the cyclone surface 41 of the central air passage 4, so that the oil smoke is prevented from diffusing and escaping, and the effects of high-efficiency smoke collection and rotary smoking are achieved; the gas ejected from the second gas outlet 501 of the side gas channel 5 can form a side wind curtain which is discharged towards the cyclone surface 41, and the rotary smoking effect can be further enhanced.

Specifically, the smoke guide part 12 of the smoke collecting cover 1 is located at the rear side of the bottom surface of the smoke inlet 11 and the back surfaces of the smoke inlet 11 and the smoke guide part 12 are located at the same plane, so that the smoke inlet 11 and the smoke guide part 12 form a 7 shape, and the front side of the bottom surface of the smoke inlet 11 is used for preventing smoke from escaping upwards. The smoke inlet area 111 is arranged at the front side of the bottom surface of the smoke inlet part 11 so that the upward spiral airflow flows into the smoke inlet part 11 through the smoke inlet area 111, and the smoke outlet 112 is arranged at the middle part of the top surface of the smoke inlet part 11. Preferably, the smoke inlet area 111 is formed by a plurality of smoke inlet holes 101, so that the smoke inlet area 111 can serve as an oil screen, on one hand, the oil-smoke separation effect can be achieved, on the other hand, the oil screen can be omitted, the assembly process is simplified, and the manufacturing cost is reduced.

As shown in fig. 1-2, in this embodiment, the central air passage 4 is vertically disposed at the center of the smoke guiding surface 121 on the front side of the smoke guiding portion 12 and divides the smoke guiding surface 121 into a left smoke guiding surface 121 and a right smoke guiding surface 121 which are symmetrical to each other, and the central air passage 4 extends from the bottom of the smoke guiding portion 12 toward the bottom of the smoke inlet portion 11 and divides the smoke inlet area 111 into two parts, so that the left smoke guiding surface 121 and the left smoke inlet area 111 correspond to a pot on the left burner of the cooker, and the right smoke guiding surface 121 and the right smoke inlet area 111 correspond to a pot on the right burner of the cooker, so as to control the working states of the first exhaust hole 401 of the central air passage 4 and the second exhaust holes 501 of the two side air passages 5 according to the specific use conditions of the left and right burners of the cooker, thereby ensuring the efficient rotary smoking effect and saving energy.

Specifically, the cross-sectional area of the central air passage 4 in the horizontal direction becomes linearly larger from bottom to top. The lateral wall or the whirl face 41 of central air flue 4 is for leading the inclined plane or the arc surface that cigarette portion 12 openly extends towards first exhaust hole 401 direction, inclined plane or arc surface are the linear grow from bottom to top at the cross-sectional area of horizontal direction, thereby make left side lead cigarette face 121 and right lead cigarette face 121 all be by the linear grow from bottom to top, so under the mating reaction of 4 lateral walls of central air flue or whirl faces 41, make the air current form the reinforcing of tornado effect, do benefit to the enhancement and inhale soon and gather together the oil smoke effect.

Preferably, the side wall or swirl surface 41 of the central air passage 4 is a circular arc surface that is curved toward the inside of the central air passage 4 or curved toward the outside of the side wall of the central air passage 4. More preferably, the side wall or the swirling surface 41 of the central air passage 4 of the present embodiment is an arc surface that is curved toward the inside of the central air passage 4, and the arc length of the arc surface at any horizontal section is a quarter of an arc, so as to ensure that the formed rotating airflow effect is optimal, and further ensure that the rotating smoking of the range hood is more efficient.

Specifically, be equipped with transition surface 42 between the relative both sides wall of center air flue 4, transition surface 42 is from lower to upper and incline forward and arrange, so is favorable to increasing the arc length of reducing arc surface in the horizontal direction cross-section, and then does benefit to reinforcing gas turning rotation effect. At least one row of first exhaust holes 401 which are vertically arranged and are exhausted towards the front are arranged on the transition surface 42 so as to cut the oil smoke into at least two areas.

Preferably, the transition surface 42 of this embodiment is a plane, and the left and right sides of the plane are respectively provided with a row of first exhaust holes 401 that are vertically arranged and give vent to the air forward, and the gas that is spouted from two rows of first exhaust holes 401 forms two left and right central air curtains, can cut the oil smoke into three regions on the one hand, on the other hand drives peripheral gas to flow under the adhesion effect to form rotatory air current with the cooperation of the circular-arc whirl face 41 of reducing diameter, the whirl effect of gas that is spouted from the first exhaust holes 401 can be accelerated on the three hand, the spiral upward air current intensity is strengthened. In other embodiments, the transition surface 42 may also be an arc surface that is curved forward and outward, and a row of first exhaust holes 401 that are vertically arranged and exit forward are disposed on the arc surface.

As shown in fig. 2 to 3, in the present embodiment, the center air duct 4 has the left air supply duct 43 and the right air supply duct 44 independent from each other, and the front surfaces of the left air supply duct 43 and the right air supply duct 44 are respectively provided with a row of first exhaust holes 401 which are vertically arranged and exhaust air toward the front. Specifically, the left air supply passage 43 is formed by the left side of the up-down center line of an air supply chamber (not shown) having an opening on one side thereof and the planar transition surface 42 provided inside the hood 1, and the right air supply passage 44 is formed by the right side of the up-down center line of the air supply chamber having an opening on one side thereof and the planar transition surface 42 provided inside the hood 1.

Specifically, the distance L1 between the side air duct 5 and the front surface of the smoke guiding portion 12 is smaller than the minimum distance L2 between the center air duct 4 and the front surface of the smoke guiding portion 12, and a row of second exhaust holes 501 which are vertically arranged and face the cyclone surface 41 are arranged on the side wall of the side air duct 5, so that the second exhaust holes 501 of the side air duct 5 blow out air towards the cyclone surface 41, i.e. the side wall of the center air duct 4, and form a wall attachment effect towards the cyclone surface 41 along the smoke guiding surface 121, which is beneficial to further accelerating the cyclone air and enhancing the rotary smoking effect.

As shown in fig. 3 to 5, further, a ventilation duct 6 is further included, one end of the ventilation duct 6 is disposed in the box 21 and is connected to the air outlet 221 of the fan assembly 22, and the other end of the ventilation duct 6 is disposed in the smoke collecting hood 1 and is respectively communicated with the left air supply duct 43, the right air supply duct 44, and the two side air ducts 5. Specifically, an opening 222 is arranged on the rear side wall of the air outlet 221 of the fan assembly 22, the ventilation duct 6 includes an air inlet section 61, the air inlet section 61 is arranged in the box 21 and provided with an extending portion 611 protruding outward at a position facing the opening 222, an air inlet port 6111 is arranged on the bottom surface of the extending portion 611, the extending portion 611 penetrates through the opening 222 and then extends into the air outlet 221, and the air inlet port 6111 is arranged facing the air outlet direction of the fan assembly 22, so that when smoke flows upward through the air outlet 221 of the fan assembly 22, part of the smoke flows through the air inlet section 61 from the air inlet port 6111, and provides an air source for the central air duct 4 and the side air duct 5.

Preferably, the opening 222 is rectangular in shape to increase the unit amount of intake air. More preferably, in order to prevent the ventilation duct 6, the left air supply duct 43 and the right air supply duct 44 from being blocked by the oil smoke and causing the exhaust hole 401 to be blocked, a filter for filtering the airflow flowing into the air intake section 61 may be additionally arranged at the air intake port 6111.

Further, the ventilation duct 6 further includes an air outlet section 62 and a connecting section 63 which are arranged in the smoke collecting cover 1, an air inlet outlet 6112 of the air inlet section 31 extends downwards to the inside of the smoke collecting cover 1, the connecting section 63 is respectively communicated with the air inlet outlet 6112 and the air outlet section 62 of the air inlet section 61, and the air outlet section 62 is respectively communicated with the left air supply duct 43, the right air supply duct 44 and the two side air ducts 5. Preferably, the air outlet section 62 of the present embodiment includes a left air outlet section 621 and a right air outlet section 622 that are independent from each other, the left air outlet section 621 and the right air outlet section 622 are both in an "L" shape, the left air outlet section 621 is respectively communicated with the connecting section 63, the left side air duct 5, and the left air supply duct 43, and the right air outlet section 622 is respectively communicated with the connecting section 63, the right side air duct 5, and the right air supply duct 44.

Furthermore, for realizing independent control by left center air curtain and by left side air flue 5, by right center air curtain and by right side air flue 5's operating condition, can add the control valve (not shown in the figure) of the break-make of control left air-out section 621 and right air-out section 622 on linkage segment 63, so that the user controls the combustor user state about according to cooking utensils, the condition of giving vent to anger of control left air-out section 621 and right air-out section 622, and then realize the system left and right sides spiral air current that makes progress, use flexibility is improved, do benefit to the high efficiency and hold together the cigarette and avoid the energy extravagant.

Example 2

The present embodiment is different from embodiment 1 in that an air supply device is further included, and the air supply device is disposed on the top or the side wall of the exhaust fume collecting cover 1, and an air supply outlet of the air supply device is respectively communicated with the left air supply passage 43, the right air supply passage 44, and the two side air passages 5, and is used for supplying air to the first exhaust hole 401 and the second exhaust hole 501. Therefore, by additionally arranging the air supply device, the unit air output of the first exhaust hole 401 and the second exhaust hole 501 can be increased, and the rotary upward airflow strength is enhanced, so that the cigarette gathering and rotary smoking effects are improved.

Further, air supply arrangement's quantity is two, one of them air supply arrangement install in 1 top left side of collection petticoat pipe and its air supply export respectively with by left side air flue 5, left air supply channel 43 intercommunication, another air supply arrangement install in 1 top right side of collection petticoat pipe and its air supply export respectively with by right side air flue 5, right air supply channel 44 intercommunication, so through two air supply arrangement independent each other, the high efficiency of the independent control left and right sides is held together cigarette and rotatory smoking effect, make range hood's use more nimble, avoid the energy extravagant.

What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.

Claims (10)

1. A range hood with a central air curtain and side air curtains comprises a smoke collecting hood (1) and an air box device (2), wherein the smoke collecting hood (1) is provided with a smoke inlet part (11) and a smoke guide part (12) positioned below the smoke inlet part (11), the bottom of the smoke inlet part (11) is provided with a smoke inlet area (111), and the top of the smoke inlet part is provided with a smoke outlet (112), the air box device (2) comprises a box body (21) and a fan assembly (22) arranged in the box body (21), the box body (21) is arranged at the top of the smoke collecting hood (1) and communicated with the smoke outlet (112), the range hood is characterized in that a vertical central air passage (4) which divides the smoke guide surface (121) into two parts and vertical side air passages (5) positioned at the left side and the right side of the smoke guide surface (121) are convexly arranged on the smoke guide surface (121), and two opposite side walls of the central air passage (4) are flow surfaces (41) which are used for enabling air flow passing through the smoke guide surface to rotate, the central air passage (4) is provided with at least one row of first exhaust holes (401) which are vertically arranged and exhaust towards the front, and each side air passage (5) is provided with one row of second exhaust holes (501) which are vertically arranged and exhaust towards the rotational flow surface (41); and the air outlet (221) of the fan assembly (22) is communicated with a smoke exhaust pipeline of the range hood, the central air passage (4) and the two side air passages (5) respectively and is used for conveying air to the first exhaust hole (401) and the second exhaust hole (501).

2. The range hood with the central air curtain and the side air curtains according to claim 1, wherein the central air passage (4) extends from the bottom of the smoke guide part (12) to the bottom surface of the smoke inlet part (11) and divides the smoke inlet area (111) into two parts, the side wall of the central air passage (4) or the rotational flow surface (41) is an inclined surface or an arc surface extending from the front surface of the smoke guide part (12) to the direction of the first exhaust hole (401), and the cross-sectional area of the inclined surface or the arc surface in the horizontal direction is linearly increased from bottom to top.

3. The range hood with the central air curtain and the side air curtains as claimed in claim 2, wherein the arc surface is curved towards the inside of the central air flue (4) or the outside of the side wall of the central air flue (4), and the arc length of the arc surface in any horizontal section is a quarter of an arc.

4. The range hood with the central air curtain and the side air curtains as claimed in claim 2, wherein a transition surface (42) is arranged between two opposite side walls of the central air passage (4), the transition surface (42) is arranged from bottom to top and inclines forwards, and at least one row of first exhaust holes (401) which are vertically arranged and exhaust towards the front are arranged on the transition surface (42).

5. The range hood with the central air curtain and the side air curtains as claimed in claim 4, wherein the transition surface (42) is a cambered surface which is bent forwards and outwards, and a row of first exhaust holes (401) which are vertically arranged and exhaust air forwards are arranged on the cambered surface; or the transition surface (42) is a plane, and a row of first exhaust holes (401) which are vertically arranged and exhaust forward are respectively arranged on the left side and the right side of the plane.

6. The range hood with the central air curtain and the side air curtains as claimed in claim 1, wherein a distance L1 between the side air flue (5) and the front surface of the smoke guide part (12) is smaller than a minimum distance L2 between the central air flue (4) and the front surface of the smoke guide part (12), and a row of second exhaust holes (501) which are vertically arranged and face the swirling surface (41) is arranged on the side wall of the side air flue (5).

7. The range hood with the central air curtain and the side air curtains as claimed in any one of claims 1 to 6, further comprising a ventilation duct (6), wherein one end of the ventilation duct (6) is disposed in the box body (21) and communicated with the air outlet (221) of the fan assembly (22), and the other end of the ventilation duct is disposed in the smoke collection hood (1) and communicated with the central air passage (4) and the two side air passages (5), respectively.

8. The range hood with the central air curtain and the side air curtains according to claim 7, wherein an opening (222) is formed in a side wall of an air outlet (221) of the fan assembly (22), the ventilation duct (6) comprises an air inlet section (61), the air inlet section (61) is arranged in the box body (21) and provided with an extension portion (611) protruding outwards at a position facing the opening (222), an air inlet (6111) is formed in the bottom surface of the extension portion (611), the extension portion (611) penetrates through the opening (222) and then extends into the air outlet (221), and the air inlet (6111) is arranged towards the air outlet direction of the fan assembly (22).

9. The range hood with the central air curtain and the side air curtain according to claim 8, wherein the ventilation duct (6) further comprises an air outlet section (62) arranged in the fume collecting hood (1), an air inlet outlet (6112) of the air inlet section (61) extends downwards to the inside of the fume collecting hood (1), and the air outlet section (62) is communicated with the air inlet outlet (6112) of the air inlet section (61), the central air passage (4) and the two side air passages (5) respectively.

10. The range hood with the central air curtain and the side air curtains as claimed in claim 9, wherein the central air passage (4) has a left air supply passage (43) and a right air supply passage (44) which are independent of each other, and the front surfaces of the left air supply passage (43) and the right air supply passage (44) are respectively provided with a row of the first exhaust holes (401) which are vertically arranged and exhaust air towards the front; air-out section (62) are including left air-out section (621) and right air-out section (622) independent each other, left side air-out section (621) respectively with air inlet outlet (6112), the left side air flue (5) of air inlet section (61) left side air supply channel (43) intercommunication, right side air-out section (622) respectively with air inlet outlet (6112), the right side air flue (5) of air inlet section (61) right side air supply channel (44) intercommunication.

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