Range hood with central air curtain and side air curtain

Abstract

The present invention discloses a range hood with a central air curtain and side air curtains, comprising a smoke collecting hood, a bellows device and an air supply device. The smoke collecting hood has a smoke inlet and a smoke guide portion located below the smoke inlet. The smoke guide surface on the front of the smoke guide portion is convexly provided with a vertical central air duct that divides the smoke guide surface into two, and vertical side air ducts located on the left and right sides of the smoke guide surface. The opposite side walls of the central air duct are swirl surfaces. The central air duct is provided with at least one row of first exhaust holes that are arranged vertically and exhaust air forward, and each side air duct is provided with a row of second exhaust holes that are arranged vertically and exhaust air toward the swirl surface. The air supply device is arranged on the smoke collecting hood and its air supply outlet is connected to the central air duct and the two side air ducts respectively. The range hood of the present invention can form a central air curtain and side air curtains, and a spiral upward airflow is formed under the cooperation of the bellows device and the swirl surface of the central air duct to prevent the diffusion and escape of oil smoke, thereby achieving a high-efficiency smoke collection and smoking effect.

Description

Technical Field

[0001] The invention relates to the technical field of range hoods, and in particular to a rotary suction technology of range hoods. Background Art

[0002] Range hoods are the main tool for collecting oil fumes in kitchens. How to improve the suction efficiency of range hoods has always been an important part of range hood design and research. When traditional range hoods are sucking air, their suction range is a hemispherical area, and gases from all directions are sucked indiscriminately. This suction method has a higher air flow rate near the air inlet, while the air flow rate far from the air inlet will drop rapidly as the distance from the air inlet increases. Therefore, at the bottom of the air inlet, the upward speed of the air decreases, resulting in insufficient upward suction force, and it is easily disturbed by external factors, such as the disturbance of airflow caused by people walking, fans or air conditioning, so that oil smoke or pollutants escape with the flow of disturbed airflow, resulting in poor smoke collection and suction effects of the range hood. Summary of the invention

[0003] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes a range hood with a central air curtain and a side air curtain, which can form a unique spiral upward airflow to prevent the diffusion and escape of oil smoke, thereby achieving an efficient smoke collection and smoking effect.

[0004] According to the range hood with a central air curtain and a side air curtain provided above, it is realized by the following technical solution:

[0005] 8. The smoke exhaust fan of claim 7, wherein the smoke exhaust fan has a plurality of first and second exhaust ports, the first and second exhaust ports being arranged in a vertical direction and a plurality of second exhaust ports being arranged in a vertical direction.

[0006] In some embodiments, the central air duct extends from the bottom of the smoke guide portion toward the bottom surface of the smoke inlet portion and divides the smoke inlet area into two, and the side wall of the central air duct or the swirl surface is an inclined surface or an arc surface extending from the front of the smoke guide portion toward the first exhaust hole, and the cross-sectional area of ​​the inclined surface or the arc surface in the horizontal direction increases linearly from bottom to top.

[0007] In some embodiments, the arc surface is curved toward the inside of the central airway or toward the outside of the side wall of the central airway, and the arc length of the arc surface in any horizontal cross section is a quarter of a circle.

[0008] In some embodiments, a transition surface is provided between two opposite side walls of the central air duct, the transition surface is arranged from bottom to top and inclined forward, and at least one row of the first exhaust holes arranged vertically and exhausting air forward is provided on the transition surface.

[0009] In some embodiments, the transition surface is an arc-shaped surface that curves forward and outward, and a row of the first exhaust holes that are vertically arranged and exhaust air forward are provided on the arc-shaped surface; or, the transition surface is a plane, and a row of the first exhaust holes that are vertically arranged and exhaust air forward are provided on the left and right sides of the plane.

[0010] In some embodiments, the distance L1 between the side air duct and the front of the smoke guide portion is smaller than the minimum distance L2 between the central air duct and the front of the smoke guide portion, and a row of second exhaust holes arranged vertically and facing the swirl surface is provided on the side wall of the side air duct.

[0011] In some embodiments, a ventilation duct is further included, wherein a mounting hole is provided on the top or side wall of the smoke hood, the ventilation duct is arranged inside the smoke hood and its air inlet is connected to the mounting hole, the central air duct and the two side air ducts are respectively connected to the ventilation duct; the air supply device includes an air supply fan, the air supply fan is installed in the mounting hole and its air supply outlet faces the air inlet of the ventilation duct.

[0012] In some embodiments, the air supply device further includes an air intake cover, on which a plurality of air intake holes for outside air to pass are provided, and the air intake cover is arranged at the air intake end of the mounting hole and is flush with the outer end surface of the mounting hole.

[0013] In other embodiments, it also includes a ventilation duct arranged inside the smoke hood, and mounting holes are respectively provided on the left and right sides or opposite side walls of the top of the smoke hood, wherein an air outlet end of one of the mounting holes is respectively connected with the central air duct and the side air duct on the left through the ventilation duct, and an air outlet end of the other mounting hole is respectively connected with the central air duct and the side air duct on the right through the ventilation duct; the number of the air supply devices is two, each of the air supply devices includes an air supply fan, and the air supply fan is installed in the corresponding mounting hole and its air supply outlet faces the air inlet of the corresponding ventilation duct.

[0014] In some embodiments, the central air duct has a left air supply duct and a right air supply duct that are independent of each other, and the front of the left air supply duct and the right air supply duct are respectively provided with a row of the first exhaust holes arranged vertically and exhausting air forward, and the left air supply duct is connected to the ventilation duct on the left, and the right air supply duct is connected to the ventilation duct on the right.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] 1. The range hood of the present invention can form a central air curtain by the gas ejected from the central airway, and a unique spiral upward airflow is formed under the cooperation of the bellows device, the central air curtain and the swirl surface of the central airway to prevent the diffusion and escape of oil smoke, thereby achieving a highly efficient smoke collection and smoking effect;

[0017] 2. The gas ejected through the side airway can form a side wind curtain that exhausts toward the swirl surface, which can further enhance the rotary smoking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a range hood in Embodiment 1 of the present invention;

[0019] Figure 2 is a bottom view of the range hood in Embodiment 1 of the present invention;

[0020] Figure 3 is a schematic structural diagram of the range hood in Embodiment 1 of the present invention from another angle, in which the back plate of the fume collecting hood is hidden;

[0021] Figure 4 It is a schematic diagram of the exploded structure of part of the range hood in Example 1 of the present invention. DETAILED DESCRIPTION

[0022] The following examples illustrate the present invention, but the present invention is not limited to these examples. Modifications to the specific embodiments of the present invention or equivalent replacement of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed by the present invention.

[0023] Example 1

[0024] like Figure 1-2 As shown, a range hood with a central air curtain and side air curtains of the present embodiment comprises a smoke collecting hood 1, a bellows device 2 and an air supply device 3, the smoke collecting hood 1 having a smoke inlet portion 11 and a smoke guiding portion 12 located below the smoke inlet portion 11, the smoke inlet portion 11 having a smoke outlet at the top and a smoke inlet area 111 at the bottom, a smoke guiding surface 121 on the front side of the smoke guiding portion 12 having a vertical central air duct 4 which divides the smoke guiding surface 121 into two, and vertical side air ducts 5 located on the left and right sides of the smoke guiding surface 121, the opposite side walls of the central air duct 4 being swirl surfaces 41 for rotating the airflow passing therethrough, the central air duct 4 being provided with at least one row of first exhaust holes 401 which are arranged vertically and exhaust air forward, the airflow ejected from the first exhaust holes 401 forming a central air curtain which can drive the flow of surrounding airflow. Each side air channel 5 is provided with a row of second exhaust holes 501 arranged vertically and exhausting air toward the swirl surface 41. The airflow ejected from the second exhaust holes 501 forms a side wind curtain that can drive the flow of the surrounding airflow. When exhausting air toward the swirl surface 41, the airflow flows along the smoke guide surface 121 toward the swirl surface 41 and then turns and rotates, thereby strengthening the strength of the rotating airflow. The bellows device 2 is arranged on the top of the smoke hood 1 and connected to the smoke outlet, and is used to extract the smoking oil and form an upward axial suction force on the swirl gas. The air supply device 3 is arranged on the smoke hood 1 and its air supply outlet is respectively connected to the central air channel 4 and the two side air channels 5, and is used to provide external air to the first exhaust hole 401 and the second exhaust hole 501.

[0025] When the range hood is working, the bellows device 2 and the air supply device 3 are started, and the upward axial suction force generated by the bellows device 2 drives the external airflow and oil smoke to flow from the smoke inlet area 111 into the smoke inlet part 11 of the smoke collecting hood 1, enter the bellows device 2 through the smoke outlet, and finally be discharged to the outside through the smoke exhaust duct of the range hood. The air supply device 3 brings external gas into the central air duct 4 and the two side air ducts 5, and sprays it out from the first exhaust hole 401 and the second exhaust hole 501. Due to the gas viscosity effect, the gas sprayed from the first exhaust hole 401 forms a central wind curtain, which can not only cut the oil smoke into different areas, but also drive the surrounding airflow to flow together and generate radial force. The airflow forms swirl gas under the cooperation of the swirl surface 41, and forms a spiral upward airflow under the cooperation of the upward axial suction force generated by the bellows device 2, so that the oil smoke is sucked upward and gathered before it diffuses, preventing the oil smoke from diffusing and escaping, thereby improving the rotary smoking effect; the gas sprayed from the second exhaust hole 501 can form a side wind curtain that exhausts toward the swirl surface 41, and the airflow flows along the smoke guide surface 121 to the swirl surface 41, then turns and rotates to form a swirl, which is beneficial to further enhance the intensity of the rotary airflow and enhance the efficient smoke-collecting smoking effect.

[0026] In the range hood of this embodiment with a central air curtain and a side air curtain, the gas ejected from the first exhaust hole 401 of the central air passage 4 can form a central air curtain, and under the cooperation of the bellows device 2, the central air curtain and the swirl surface 41 of the central air passage 4, a unique spiral upward airflow is formed to prevent the oil smoke from diffusing and escaping, thereby achieving a high-efficiency smoke-collecting and smoking effect. In addition, the gas ejected from the second exhaust hole 501 of the side air passage 5 can form a side air curtain that exhausts toward the swirl surface 41, which can further enhance the rotary smoking effect.

[0027] Specifically, the smoke guide portion 12 of the smoke hood 1 is located at the rear side of the bottom surface of the smoke inlet portion 11 and the back sides of the two are located in the same plane, so that the smoke inlet portion 11 and the smoke guide portion 12 form a "7" shape, and the front side of the bottom surface of the smoke inlet portion 11 is used to prevent the oil smoke from escaping upward. The smoke inlet area 111 is arranged at the front side of the bottom surface of the smoke inlet portion 11, so that the spiral upward airflow flows into the interior of the smoke inlet portion 11 through the smoke inlet area 111, and the smoke outlet is arranged in the middle of the top surface of the smoke inlet portion 11. Preferably, the smoke inlet area 111 is composed of a plurality of smoke inlet holes 101, so that the smoke inlet area 111 can act as an oil net, which can achieve the oil smoke separation effect on the one hand, and on the other hand, the oil net can be omitted, simplifying the assembly process and reducing the manufacturing cost.

[0028] Specifically, the bellows device 2 includes a box body 21 and a fan assembly 22. The box body 21 is arranged on the top of the smoke hood 1 or the smoke inlet 11 and is connected to the smoke outlet. The fan assembly 22 is installed inside the box body 21 and its air outlet is connected to the smoke exhaust duct of the range hood. In this embodiment, the fan assembly 22 is a volute fan assembly.

[0029] In this embodiment, the central air duct 4 is vertically arranged at the center position of the smoke guide surface 121 on the front side of the smoke guide portion 12 and divides the smoke guide surface 121 into a left smoke guide surface 121 and a right smoke guide surface 121 which are symmetrical to each other, and the central air duct 4 extends from the bottom of the smoke guide portion 12 toward the bottom surface of the smoke inlet portion 11 and divides the smoke inlet area 111 into two, so that the left smoke guide surface 121 and the left smoke inlet area 111 correspond to the pots on the left burner of the stove, and the right smoke guide surface 121 and the right smoke inlet area 111 correspond to the pots on the right burner of the stove, so as to control the working states of the first exhaust hole 401 of the central air duct 4 and the second exhaust hole 501 of the two side air ducts 5 according to the specific usage of the left and right burners of the stove, so as to save energy while ensuring the efficient rotation suction effect of oil smoke.

[0030] Specifically, the cross-sectional area of ​​the central airway 4 in the horizontal direction increases linearly from bottom to top. The side wall or swirl surface 41 of the central airway 4 is an inclined surface or arc surface extending from the front of the smoke guide portion 12 toward the first exhaust hole 401, and the cross-sectional area of ​​the inclined surface or arc surface in the horizontal direction increases linearly from bottom to top, so that the left smoke guide surface 121 and the right smoke guide surface 121 both increase linearly from bottom to top, so that under the cooperation of the side wall of the central airway 4 (i.e., the swirl surface 41), the tornado effect of the airflow is enhanced, which is conducive to strengthening the effect of swirling and gathering oil smoke.

[0031] Preferably, the side wall or swirl surface 41 of the central airway 4 is an arc surface, which is curved toward the inside of the central airway 4 or toward the outside of the side wall of the central airway 4. More preferably, in this embodiment, the side wall or swirl surface 41 of the central airway 4 is an arc surface curved toward the inside of the central airway 4, and the arc length of the arc surface in any horizontal cross section is a quarter of an arc, so that the formed rotating airflow effect can be optimal, thereby ensuring that the rotating smoke extraction of the range hood is more efficient.

[0032] Specifically, a transition surface 42 is provided between the two opposite side walls of the central air channel 4, and the transition surface 42 is arranged from bottom to top and tilted forward, which is conducive to increasing the arc length of the variable diameter arc surface in the horizontal cross section, thereby facilitating the gas turning and rotating effect. At least one row of first exhaust holes 401 arranged vertically and exhausting air forward is provided on the transition surface 42 to cut the oil smoke into at least two areas.

[0033] Preferably, the transition surface 42 of the present embodiment is a plane, and a row of first exhaust holes 401 arranged vertically and exhausting air forward are respectively provided on the left and right sides of the plane. The gases ejected from the two rows of first exhaust holes 401 form left and right central wind curtains, which can, on the one hand, cut the oil smoke into three areas; on the other hand, drive the flow of surrounding gases under the action of the adhesion effect, and cooperate with the swirl surface 41 with a variable diameter arc to form a rotating airflow; and on the third hand, accelerate the swirl effect of the gas ejected from the first exhaust holes 401 and enhance the intensity of the spiral upward airflow.

[0034] In other embodiments, the transition surface 42 may also be an arc-shaped surface that curves forward and outward, and a row of first exhaust holes 401 that are arranged vertically and exhaust air forward are provided on the arc-shaped surface.

[0035] Specifically, the distance L1 between the side air duct 5 and the front of the smoke guide portion 12 is smaller than the minimum distance L2 between the central air duct 4 and the front of the smoke guide portion 12, and a row of second exhaust holes 501 are vertically arranged and facing the swirl surface 41 on the side wall of the side air duct 5. In this way, the second exhaust holes 501 of the side air duct 5 blow out gas toward the swirl surface 41, i.e., the side wall of the central air duct 4, and the gas flows along the smoke guide surface 121 toward the swirl surface 41 to form a wall attachment effect, which is beneficial to further accelerate the swirl gas and enhance the rotating smoking effect.

[0036] like Figure 3-4 As shown, further, it also includes a ventilation duct 6 arranged inside the smoke collecting hood 1, and mounting holes 112 are respectively arranged on the left and right sides or the opposite side walls of the top of the smoke collecting hood 1, and the air outlet end of one mounting hole 112 is respectively connected with the central airway 4 and the airway 5 on the left side through the ventilation duct 6, and the air outlet end of the other mounting hole 112 is respectively connected with the central airway 4 and the airway 5 on the right side through the ventilation duct 6; the number of air supply devices 3 is two, and each air supply device 3 includes an air supply fan 31, and the air supply fan 31 is installed in the corresponding mounting hole 112 and its air supply outlet faces the air inlet of the corresponding ventilation duct 6. Therefore, by cooperating with the two ventilation ducts 6 and the two air supply fans 31, by respectively controlling the working states of the two air supply fans 31, it is possible to respectively control the working states of the second exhaust holes 501 of the left and right side airways 5, thereby facilitating the user to control the working conditions of the two air supply fans 31 according to the use states of the left and right burners of the stove.

[0037] In this embodiment, two mounting holes 112 are respectively arranged on the left and right sides of the top of the smoke hood 1 and located on the left and right outer sides of the bellows device 2. The upper end surface of each mounting hole 112 penetrates the top surface of the smoke hood 1, and the lower end surface extends to the inside of the smoke hood 1 so as to be connected with the air inlet of the ventilation duct 6. The ventilation duct 6 includes an air inlet section and an air outlet section which form an inverted "T" shape with each other, wherein the air inlet section is connected with the lower end of the corresponding mounting hole 112, and the two ends of the air outlet section are respectively connected with the central air duct 4 and the corresponding side air duct 5.

[0038] Specifically, the central air duct 4 has a left air supply duct 43 and a right air supply duct 44 that are independent of each other. The front 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 arranged vertically and exhausting air forward, and the left air supply duct 43 is connected to the air supply outlet of the left air supply fan 31 through the left ventilation duct 6, and the right air supply duct 44 is connected to the right air supply fan 31 through the right ventilation duct 6. Therefore, by providing the left air supply duct 43 and the right air supply duct 44, the range hood has two independent central air curtains, and the left central air curtain and the left air duct 5 are controlled by the left air supply fan 31, and the right central air curtain and the right air duct 5 are controlled by the right air supply fan 31, so that the user can control the spiral upward airflow on the left and right sides according to the use status of the left and right burners of the stove, which is more flexible to use, and is conducive to efficient smoke collection and avoiding energy waste.

[0039] In this embodiment, the left air supply duct 43 is formed by an air supply cavity (not shown in the figure) arranged inside the smoke hood 1 and having an opening on one side and a planar transition surface 42 on the left side of the center line in the up-down direction, and the right air supply duct 44 is formed by an air supply cavity (not shown in the figure) arranged inside the smoke hood 1 and having an opening on one side and a planar transition surface 42 on the right side of the center line in the up-down direction.

[0040] Furthermore, each air supply device 3 further includes an air intake cover 32, on which a plurality of air intake holes for outside air to pass are provided, and the air intake cover 32 is provided at the air intake end of the mounting hole 112 and is flush with the outer end surface of the mounting hole 112, so that by adding the air intake cover 32, it is possible to prevent foreign matter from entering the mounting hole 112 and the air supply fan 31, thereby preventing foreign matter from clogging the first exhaust hole 401 and the second exhaust hole 501, thereby ensuring the performance of the range hood. In this 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.

[0041] Furthermore, each air supply device 3 further includes a filter 33, which is installed in the mounting hole 112 and located between the air supply fan 31 and the air inlet cover 32, and is used to filter external impurities to prevent the external impurities from contaminating the air supply fan 31, the central airway 4 and the airways 5 on both sides after the range hood has been working for a long time, thereby preventing the first exhaust hole 401 and the second exhaust hole 501 from being blocked. Preferably, the filter 33 is rectangular, and a plurality of filter holes are provided on the top and bottom surfaces of the filter 33, so that double filtering can be formed, the filtering effect can be improved, and the air supply fan 31, the ventilation duct 6, the central airway 4 and the side airway 5 can be prevented from being contaminated, thereby further improving the usability of the range hood.

[0042] Example 2

[0043] The difference between this embodiment and embodiment 1 is that the number of air supply devices 3 is different, and the structure of the ventilation duct 6 is correspondingly different. Specifically, the number of air supply devices 3 and ventilation duct 6 is one, and a mounting hole 112 is provided on the top or side wall of the smoke hood 1, and the air supply device 3 is installed at the mounting hole 112. The ventilation duct 6 is arranged inside the smoke hood 1 and its air inlet is connected to the mounting hole 112, and the central air duct 4 and the two side air ducts 5 are respectively connected to the ventilation duct 6. In this way, only one air supply device 3 and one ventilation duct 6 are needed to cooperate to realize the control of the ejection of gas from the second exhaust holes 501 of the two side air ducts 5 and the first exhaust holes 401 of the central air duct 4, which is conducive to reducing the manufacturing cost.

[0044] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A range hood with a central air curtain and side air curtains, comprising a smoke collecting hood (1) and a bellows device (2), wherein the smoke collecting hood (1) comprises a smoke inlet portion (11) and a smoke guiding portion (12) located below the smoke inlet portion (11), the smoke inlet portion (11) is provided with a smoke outlet at the top and a smoke inlet area (111) at the bottom, the smoke inlet area (111) being composed of a plurality of smoke inlet holes (101), the bellows device (2) being arranged at the top of the smoke collecting hood (1) and being connected to the smoke outlet, characterized in that: It also comprises an air supply device (3), wherein a vertical central air duct (4) is protruding from a smoke guide surface (121) on the front side of the smoke guide portion (12) and divides the smoke guide surface (121) into two, and vertical side air ducts (5) are located on the left and right sides of the smoke guide surface (121), and the opposite side walls of the central air duct (4) are swirl surfaces (41) for rotating the airflow passing therethrough, and the central air duct (4) is provided with at least one row of first exhaust holes (401) arranged vertically and exhausting air forward, and each of the side air ducts (5) is provided with a row of second exhaust holes (501) arranged vertically and exhausting air toward the swirl surface (41); the air supply device (3) is arranged on the smoke collecting hood (1), and its air supply outlet is respectively connected to the central air duct (4) and the two side air ducts (5); Wherein, the side wall of the central airway (4) or the swirl surface (41) is an inclined surface or an arc surface extending from the front of the smoke guide portion (12) toward the first exhaust hole (401), and the cross-sectional area of ​​the inclined surface or the arc surface in the horizontal direction increases linearly from bottom to top; A transition surface (42) is provided between two opposite side walls of the central air channel (4), the transition surface (42) being arranged from bottom to top and tilted forward, and at least one row of the first exhaust holes (401) arranged vertically and exhausting air forward is provided on the transition surface (42).

2. A range hood with a central air curtain and side air curtains according to claim 1, characterized in that: The central air channel (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.

3. The range hood with a central air curtain and side air curtains according to claim 1, characterized in that: The arc surface bends toward the inside of the central airway (4) or bends toward the outside of the side wall of the central airway (4), and the arc length of the arc surface in any horizontal cross section is a quarter of a circular arc.

4. The range hood with a central air curtain and side air curtains according to claim 1, characterized in that: The transition surface (42) is an arc-shaped surface that curves forward and outward, and a row of the first exhaust holes (401) arranged vertically and exhausting air forward are provided on the arc-shaped surface; or, the transition surface (42) is a plane, and a row of the first exhaust holes (401) arranged vertically and exhausting air forward are provided on the left and right sides of the plane respectively.

5. The range hood with a central air curtain and side air curtains according to claim 1, characterized in that: The distance L1 between the side air duct (5) and the front face of the smoke guide portion (12) is smaller than the minimum distance L2 between the central air duct (4) and the front face of the smoke guide portion (12), and a row of second exhaust holes (501) arranged vertically and facing the swirl surface (41) are provided on the side wall of the side air duct (5).

6. A range hood with a central air curtain and side air curtains according to any one of claims 1 to 5, characterized in that: It also includes a ventilation duct (6), the top or side wall of the smoke hood (1) is provided with a mounting hole (112), the ventilation duct (6) is arranged inside the smoke hood (1) and its air inlet is connected to the mounting hole (112), the central air duct (4) and the two side air ducts (5) are respectively connected to the ventilation duct (6); the air supply device (3) includes an air supply fan (31), the air supply fan (31) is installed in the mounting hole (112) and its air supply outlet faces the air inlet of the ventilation duct (6).

7. A range hood with a central air curtain and side air curtains according to claim 6, characterized in that: The air supply device (3) further comprises an air intake cover (32), on which a plurality of air intake holes for outside air to pass are provided, and the air intake cover (32) is arranged on the air intake end of the mounting hole (112) and is flush with the outer end surface of the mounting hole (112).

8. A range hood with a central air curtain and side air curtains according to any one of claims 1 to 5, characterized in that: It also includes a ventilation duct (6) arranged inside the smoke hood (1), and mounting holes (112) are respectively provided on the left and right sides or the opposite side walls of the top of the smoke hood (1), wherein the air outlet end of one of the mounting holes (112) is respectively connected to the central air duct (4) and the left side air duct (5) through the ventilation duct (6), and the air outlet end of the other mounting hole (112) is respectively connected to the central air duct (4) and the right side air duct (5) through the ventilation duct (6); the number of the air supply devices (3) is two, and each of the air supply devices (3) includes an air supply fan (31), and the air supply fan (31) is installed in the corresponding mounting hole (112) and its air supply outlet faces the air inlet of the corresponding ventilation duct (6).

9. The range hood with central air curtain and side air curtain according to claim 8, characterized in that: The central air duct (4) has a left air supply duct (43) and a right air supply duct (44) which are independent of each other. The front sides of the left air supply duct (43) and the right air supply duct (44) are respectively provided with a row of the first exhaust holes (401) arranged vertically and exhausting air forward, and the left air supply duct (43) is connected to the ventilation duct (6) on the left, and the right air supply duct (44) is connected to the ventilation duct (6) on the right.

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