CN111981527A - Range hood with central air curtain and side air curtain - Google Patents

Abstract

The invention discloses a range hood with a central air curtain and side air curtains, which comprises a smoke collecting hood, an air box device and an air supply device, wherein the smoke collecting hood is provided with a smoke inlet part and a smoke guide part positioned below the smoke inlet part, a vertical central air passage for dividing 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 surface 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 which are vertically arranged and exhaust forward, and each side air passage is provided with one row of second exhaust holes which are vertically arranged and exhaust toward the rotational flow surfaces; the air supply device is arranged on the fume collecting hood, and an air supply outlet of the air supply device is respectively communicated with the central air passage and the two side air passages. The range hood can form a central air curtain and a side air curtain, and forms spiral upward airflow under the matching of the air box device and the rotational flow surface of the central air passage, so that oil smoke is prevented from diffusing and escaping, and the high-efficiency smoke collecting and smoking effect is achieved.

Description

Range hood with central air curtain and side air curtain

Technical Field

The invention relates to the technical field of range hoods, in particular to a rotary smoke suction technology of a range hood.

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 invention aims to solve one of the problems in the prior related art at least to a certain extent, and therefore the invention provides the range hood with the central air curtain and the side air curtain, which can form unique spiral upward airflow, prevent oil smoke from diffusing and escaping and achieve the effect of high-efficiency smoke gathering and smoking.

According to the range hood that provides a have central 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 top of the smoke inlet part is provided with a smoke outlet, the bottom of the smoke inlet part is provided with a smoke inlet area, the air box device 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 used 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 forwards or towards the rotational flow surfaces; the air supply device is arranged on the smoke collection cover, and an air supply outlet of the air supply device is communicated with the central air passage and the two side air passages respectively.

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 L1 between the side air duct and the front face of the smoke guide part is smaller than the minimum distance L2 between the central air duct and the front face of the smoke guide part, 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 duct.

In some embodiments, the exhaust hood further comprises a ventilating duct, the top or the side wall of the exhaust hood is provided with a mounting hole, the ventilating duct is arranged inside the exhaust hood, an air inlet of the ventilating duct is communicated with the mounting hole, and the central air duct and the two side air ducts are respectively communicated with the ventilating duct; the air supply device comprises an air supply fan, the air supply fan is installed in the installation hole, and an air supply outlet of the air supply fan faces towards the air inlet of the ventilation pipeline.

In some embodiments, the air supply device further includes an air inlet cover, the air inlet cover is provided with a plurality of air inlets through which outside air passes, and the air inlet cover is disposed at the air inlet end of the mounting hole and is flush with the outer end face of the mounting hole.

In other embodiments, the exhaust hood further comprises ventilation ducts arranged inside the exhaust hood, mounting holes are respectively arranged on the left side and the right side of the top of the exhaust hood or on the two opposite side walls of the top of the exhaust hood, the air outlet end of one of the mounting holes is respectively communicated with the central air duct and the left side air duct through the ventilation ducts, and the air outlet end of the other mounting hole is respectively communicated with the central air duct and the right side air duct through the ventilation ducts; air supply arrangement's quantity is two, every air supply arrangement includes air supply fan, air supply fan installs in corresponding in the mounting hole and its air supply export orientation correspond air pipe's air intake.

In some embodiments, the center air flue has left air feed way and right air feed way independent each other, left side air feed way with the front of right air feed way is equipped with one row of vertical arrangement respectively and gives vent to anger forward first exhaust hole, just left side air feed way with lean on a left side ventilation pipe intercommunication, right side air feed way with lean on a right side ventilation pipe intercommunication.

Compared with the prior art, the invention at least comprises the following beneficial effects:

1. according to the range hood disclosed by the invention, the gas sprayed out of the central air passage can form the central air curtain, and under the combined action of the air box device, the central air curtain and the cyclone surface of the central air passage, a unique spiral upward airflow is formed, so that the oil smoke is prevented from diffusing and escaping, and the effects of high-efficiency smoke collection and smoking are achieved;

2. 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 a schematic structural view of the range hood in another angle in embodiment 1 of the present invention, in which a smoke collecting hood back plate is hidden;

fig. 4 is an exploded schematic view of a part of the structure of the range hood 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. Modifications to the embodiments of the invention or equivalent substitutions of parts of technical features without departing from the spirit of the invention are intended to be covered by the scope of the claims of the invention.

Example 1

As shown in fig. 1-2, the range hood with a central air curtain and a side air curtain of the present embodiment includes a smoke collecting hood 1, a wind box device 2 and an air supply device 3, the smoke collecting hood 1 has a smoke inlet 11 and a smoke guide 12 located below the smoke inlet 11, the smoke inlet 11 has a smoke outlet at the top and a smoke inlet region 111 at the bottom, a vertical central air duct 4 dividing the smoke guide 121 into two parts and vertical side air ducts 5 located at the left and right sides of the smoke guide 121 are convexly disposed on the smoke guide 121 on the front surface of the smoke guide 12, two opposite side walls of the central air duct 4 are vertical surfaces 41 for rotating the air flowing through the central air duct, the central air duct 4 is provided with at least one row of first air vents 401 vertically disposed and emitting air forward, and the air flow ejected from the first air vents 401 forms a central air curtain capable of driving peripheral air flows. 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 air box device 2 is arranged at the top of the smoke collecting cover 1 and communicated with the smoke outlet, and is used for sucking smoke oil and forming upward axial suction on the cyclone gas. The air supply device 3 is arranged on the fume collecting hood 1, and an air supply outlet of the air supply device is respectively communicated with the central air passage 4 and the two side air passages 5, and is used for providing outside air for the first exhaust hole 401 and the second exhaust hole 501.

When the range hood works, the air box device 2 and the air supply device 3 are started, the upward axial suction force generated by the air box device 2 drives external air flow and oil smoke to flow into the smoke inlet part 11 of the smoke collection cover 1 from the smoke inlet area 111, enter the air box device 2 through the smoke outlet, and finally are discharged out of a room from a smoke exhaust pipeline of the range hood. The air supply device 3 brings external air into the central air passage 4 and the two side air passages 5, and the external air is sprayed out from the first exhaust holes 401 and the second exhaust holes 501, and due to the air viscosity effect, the air sprayed out from the first exhaust holes 401 forms a central air curtain, so that the oil smoke can be cut into different areas, peripheral air flows can be driven to flow together and generate radial force, the air flows form rotational flow air under the matching action of the rotational flow surface 41, and spiral upward air flows are formed under the matching action of upward axial suction force generated by the air box device 2, so that the oil smoke is upwards and spirally sucked and gathered before diffusion, 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 gas flows along the smoke guide surface 121 to the cyclone surface 41 and then turns and rotates to form cyclone, so that the strength of the rotating gas flow is further enhanced, and the high-efficiency smoke gathering and smoking effect is enhanced.

The range hood with the central air curtain and the side air curtain of the embodiment has the advantages that the gas sprayed out of the first exhaust hole 401 of the central air passage 4 can form the central air curtain, and under the cooperative action of the cyclone surfaces 41 of the bellows device 2, the central air curtain and the central air passage 4, unique upward spiral airflow is formed, oil smoke is prevented from diffusing and escaping, and the high-efficiency smoke gathering and smoking effect is achieved. In addition, 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 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.

Specifically, the bellows device 2 includes a box 21 and a fan assembly 22, the box 21 is disposed on the top of the smoke collecting hood 1 or the smoke inlet 11 and is communicated with the smoke outlet, and the fan assembly 22 is installed inside the box 21 and the air outlet thereof is communicated with the smoke exhaust pipe of the range hood. In the present embodiment, the fan assembly 22 is a volute fan assembly.

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 the left smoke guiding surface 121 and the 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 surface 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 the inclined plane or the arc surface that extend towards first exhaust hole 401 direction by leading cigarette portion 12 openly, and inclined plane or arc surface are the linear grow from bottom to top at the cross-sectional area of horizontal direction to 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 central air flue 4 lateral wall (be whirl face 41), make the air current form the enhancement of tornado effect, do benefit to and strengthen the spin-on 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.

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. 3-4, further, the exhaust hood further comprises an air duct 6 arranged inside the exhaust fume collecting hood 1, mounting holes 112 are respectively arranged on the left side and the right side of the top of the exhaust fume collecting hood 1 or on the two opposite side walls of the exhaust fume collecting hood 1, wherein the air outlet end of one mounting hole 112 is respectively communicated with the central air duct 4 and the left side air duct 5 through the air duct 6, and the air outlet end of the other mounting hole 112 is respectively communicated with the central air duct 4 and the right side air duct 5 through the air duct 6; the number of the air supply devices 3 is two, each air supply device 3 comprises an air supply fan 31, the air supply fan 31 is installed in the corresponding installation hole 112, and an air supply outlet of the air supply fan faces to an air inlet of the corresponding ventilation pipeline 6. From this, cooperate through two air pipe 6 and two air supply fan 31, through the operating condition who controls two air supply fan 31 respectively, alright realized controlling the operating condition of controlling the second exhaust hole 501 of two side air flue 5 about respectively, and then the user of being convenient for controls the operating condition of two air supply fan 31 according to combustor user state about the cooking utensils.

In this embodiment, two mounting holes 112 are respectively disposed on the left and right sides of the top of the smoke collecting hood 1 and located on the left and right outer sides of the air box device 2, and the upper end face of each mounting hole 112 penetrates through the top face and the lower end face of the smoke collecting hood 1 and extends into the smoke collecting hood 1 so as to be connected with the air inlet of the ventilation duct 6. The ventilation duct 6 comprises an air inlet section and an air outlet section which mutually form an inverted T shape, wherein the air inlet section is communicated with the lower end of the corresponding mounting hole 112, and the two ends of the air outlet section are respectively communicated with the central air passage 4 and the corresponding side air passages 5.

Specifically, 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, the front faces of the left air supply passage 43 and the right air supply passage 44 are respectively provided with a row of first exhaust holes 401 which are vertically arranged and exhaust air forward, and the left air supply passage 43 communicates with the air supply outlet of the left air supply fan 31 through a left ventilation duct 6, and the right air supply passage 44 communicates with the right air supply fan 31 through a right ventilation duct 6. From this, through setting up left air supply way 43 and right air supply way 44, thereby make range hood have the two independent lane center air curtain each other, and lean on left center air curtain and lean on left side air flue 5 to be controlled by the air supply fan 31 that leans on left, lean on right center air curtain and lean on right side air flue 5 to control through the air supply fan 31 that leans on right, and then be convenient for the user according to combustor user state control left and right sides spiral air current that makes progress about cooking utensils, it is higher to use the flexibility, do benefit to the high efficiency and hold together the cigarette and avoid the energy extravagant.

In the present embodiment, the left air supply passage 43 is formed by enclosing an air supply chamber (not shown) having an opening on one side thereof and the planar transition surface 42 in the interior of the hood 1 on the left side of the vertical center line, and the right air supply passage 44 is formed by enclosing an air supply chamber (not shown) having an opening on one side thereof and the planar transition surface 42 in the interior of the hood 1 on the right side of the vertical center line.

Further, every air supply arrangement 3 still includes air inlet cover 32, is equipped with a plurality of inlet ports that supply the outside air to pass through on air inlet cover 32, and air inlet cover 32 lid is located the air inlet end of mounting hole 112 and is mutually parallel and level with the outer terminal surface of mounting hole 112, so through addding air inlet cover 32, can prevent that external impurity from entering into mounting hole 112 and air supply fan 31 the inside, and then avoid external impurity to block up first exhaust hole 401 and second exhaust hole 501, guarantee range hood's performance. In the present embodiment, the outer end surface of the mounting hole 112 specifically refers to the end of the mounting hole 112 away from the inside of the smoke collecting hood 1.

Furthermore, each air supply device 3 further comprises a filter 6, and the filter 6 is installed in the installation hole 112 and located between the air supply fan 31 and the air inlet cover 32, and is used for filtering external impurities, so as to prevent the external impurities from polluting the air supply fan 31, the central air passage 4 and the air passages 5 on the two sides after the range hood works for a long time, and further prevent the first exhaust hole 401 and the second exhaust hole 501 from being blocked. Preferably, the filter 6 is rectangular, and the top surface and the bottom surface of the filter 6 are respectively provided with a plurality of filter holes, so that double filtration can be formed, the filtering effect is improved, the air supply fan 31, the ventilation pipeline 6, the central air passage 4 and the side air passages 5 are prevented from being polluted, and the usability of the range hood is further improved.

Example 2

The present embodiment is different from embodiment 1 in the number of air blowing devices 3 and the structure of the ventilation duct 6. Specifically, the number of the air supply device 3 and the ventilation duct 6 is one, a mounting hole 112 is provided at the top or the side wall of the smoke collecting hood 1, and the air supply device 3 is mounted at the mounting hole 112. The ventilation duct 6 is arranged inside the smoke collecting hood 1, the air inlet of the ventilation duct is communicated with the mounting hole 112, the central air duct 4 and the two side air ducts 5 are respectively communicated with the ventilation duct 6, and therefore the situation that the second exhaust holes 501 of the two side air ducts 5 and the first exhaust holes 401 of the central air duct 4 are sprayed is controlled only by matching one air supply device 3 and one ventilation duct 6, and manufacturing cost reduction is facilitated.

What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.

Claims (10)

1. The utility model provides a range hood with center air curtain and side air curtain, includes collection petticoat pipe (1) and bellows device (2), collection petticoat pipe (1) has into cigarette portion (11) and is located smoke guide portion (12) of advancing cigarette portion (11) below, smoke guide portion (11) top is equipped with the outlet, the bottom is equipped with into smoke region (111), bellows device (2) set up in collection petticoat pipe (1) top and with the outlet intercommunication, its characterized in that still includes air supply arrangement (3) the positive smoke guide face (121) of smoke guide portion (12) is protruding to be equipped with vertical center air flue (4) that smoke guide face (121) divide into two and be located vertical side air flue (5) of smoke guide face (121) left and right sides, the rotatory air flue face (41) of air current that is used for making its air current of flowing through of center air flue (4) both sides, center air flue (4) are equipped with at least one row of vertical arrangement and are given vent forward (401) Each side air channel (5) is provided with a row of second exhaust holes (501) which are vertically arranged and emit air towards the rotational flow surface (41); the air supply device (3) is arranged on the fume collecting hood (1) and an air supply outlet of the air supply device is communicated with the central air passage (4) and the two side air passages (5) respectively.

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 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 the first exhaust holes (401) which are vertically arranged and exhaust towards the front is 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 the 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 center air curtain and the side air curtain as claimed in claim 1, wherein the distance L1 between the side air flue (5) and the front surface of the smoke guide part (12) is smaller than the minimum distance L2 between the center 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) are arranged on the side wall of the side air flue (5).

7. A range hood with a central air curtain and a side air curtain as claimed in any one of claims 1-6, further comprising a ventilating duct (6), wherein the top or the side wall of the smoke collecting hood (1) is provided with a mounting hole (112), the ventilating duct (6) is arranged inside the smoke collecting hood (1) and the air inlet of the ventilating duct is communicated with the mounting hole (112), the central air flue (4) and the two side air flues (5) are respectively communicated with the ventilating duct (6); air supply arrangement (3) are including air supply fan (31), air supply fan (31) install in mounting hole (112) and its air supply export orientation the air intake of air pipe (6).

8. The range hood with the central air curtain and the side air curtains as claimed in claim 8, wherein the air supply device (3) further comprises an air inlet cover (32), a plurality of air inlet holes for passing the outside air are formed in the air inlet cover (32), and the air inlet cover (32) is arranged at the air inlet end of the mounting hole (112) and is flush with the outer end face of the mounting hole (112).

9. The range hood with the central air curtain and the side air curtains according to any one of claims 1 to 6, further comprising ventilation ducts (6) arranged inside the smoke collecting hood (1), wherein mounting holes (112) are respectively arranged on the left side and the right side of the top of the smoke collecting hood (1) or on the two opposite side walls of the top of the smoke collecting hood (1), the air outlet end of one of the mounting holes (112) is respectively communicated with the central air flue (4) and the left side air flue (5) through the ventilation duct (6), and the air outlet end of the other mounting hole (112) is respectively communicated with the central air flue (4) and the right side air flue (5) through the ventilation duct (6); the quantity of air supply arrangement (3) is two, every air supply arrangement (3) are including air supply fan (31), air supply fan (31) install in corresponding in mounting hole (112) and its air supply export orientation correspond the air intake of air pipe (6).

10. The range hood with the center air curtain and the side air curtain as claimed in claim 8, wherein the center air passage (4) is provided with a left air supply passage (43) and a right air supply passage (44) which are independent of each other, the front surfaces of the left air supply passage (43) and the right air supply passage (44) are respectively provided with a row of first exhaust holes (401) which are vertically arranged and are exhausted forwards, the left air supply passage (43) is communicated with the ventilation duct (6), and the right air supply passage (44) is communicated with the ventilation duct (6).

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