A range hood with a central air curtain

Abstract

The present invention discloses an oil fume suction machine with a central air curtain, which includes a smoke collecting hood and a wind box device. The smoke collecting hood has a smoke inlet part and a smoke guiding part located below the smoke inlet part. The bottom of the smoke inlet part is provided with a smoke inlet area, and the top is provided with a smoke outlet. On the front smoke guiding surface of the smoke guiding part, a vertical central air duct that divides the smoke guiding surface into two parts is convexly provided. The opposite side walls of the central air duct are swirling surfaces, and at least one row of exhaust holes is provided in the central air duct; the wind box device includes a box body and a fan assembly arranged in the box body. The air outlets of the fan assembly are respectively communicated with the smoke exhaust pipe of the oil fume suction machine and the central air duct. The oil fume suction machine of the present invention can form a central air curtain, and cooperate with the swirling surfaces of the wind box device and the central air duct to form a spiral upward air flow, preventing the diffusion and escape of oil fume, and achieving an efficient oil fume collecting and smoking effect.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and particularly to a rotating smoking technology for range hoods. Background Art

[0002] Range hoods are the main tools for capturing kitchen indoor oil fumes. How to improve the suction efficiency of range hoods has always been an important content in the design and research of range hoods. When a traditional range hood inhales air, its inhalation range is a hemispherical area, and the gas in all directions is inhaled without difference. In this inhalation method, the air flow velocity is relatively large near the inhalation port, while the air flow velocity far from the inhalation port will rapidly decrease as the distance from the inhalation port increases. Therefore, at the very bottom of the inhalation port, the upward velocity of the air becomes small, resulting in insufficient upward suction force, and it is extremely vulnerable to external factors, such as being easily affected by disturbing air flow factors such as people walking, fan or air conditioner operation, etc., so that the oil fumes or pollutants escape along with the flow of the disturbing air flow, resulting in poor oil fume collection and smoking 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 related art to some extent. For this reason, the present invention provides a range hood with a central air curtain, which has high tail gas utilization rate, can form a unique spiral upward air flow, prevent the diffusion and escape of oil fumes, and achieve an efficient oil fume collection and smoking effect.

[0004] According to the above-provided range hood with a central air curtain, it is realized through the following technical solutions:

[0005] A range hood with a central air curtain includes a smoke collecting hood and a wind box device. The smoke collecting hood has a smoke inlet part and a smoke guiding part located below the smoke inlet part. The bottom of the smoke inlet part is provided with a smoke inlet area, and the top is provided with a smoke outlet. The wind box device includes a box body and a fan assembly arranged in the box body. The box body is arranged on the top of the smoke collecting hood and is communicated with the smoke outlet. Among them, on the front smoke guiding surface of the smoke guiding part, a vertical central air passage that divides the smoke guiding surface into two is convexly provided. The central air passage is provided with at least one row of exhaust holes arranged vertically and discharging air forward, and the opposite side walls of the central air passage are swirling surfaces for making the air flow passing through it rotate; the air outlets of the fan assembly are respectively communicated with the smoke exhaust pipe of the range hood and the central air passage for delivering gas to the exhaust holes.

[0006] In some embodiments, the central air passage extends from the bottom of the smoke guiding part towards the bottom surface of the smoke inlet part and divides the smoke inlet area into two, and the side wall or the swirling surface of the central air passage is an inclined surface or an arc surface extending from the front of the smoke guiding part towards the exhaust hole direction, and the cross-sectional area of the inclined surface or the arc surface in the horizontal direction linearly increases from bottom to top.

[0007] In some embodiments, the arc surface bends towards the inside of the central air duct or towards the outside of the side wall of the central air duct, and the arc length of the arc surface in any horizontal section is a quarter of a circle.

[0008] In some embodiments, a transition surface is provided between the opposite side walls of the central air duct. The transition surface is arranged obliquely upward and forward. At least one row of the exhaust holes arranged vertically and exhausting air forward is provided on the transition surface.

[0009] In some embodiments, the transition surface is an arc surface that bends forward and outward. One row of the exhaust holes arranged vertically and exhausting air forward is provided on the arc surface; alternatively, the transition surface is a plane, and one row of the exhaust holes arranged vertically and exhausting air forward is provided on each of the left and right sides of the plane.

[0010] In some embodiments, a ventilation duct is further included. One end of the ventilation duct is arranged inside the box body and communicated with the air outlet of the fan assembly, and the other end is arranged inside the smoke collecting hood and communicated with the central air duct.

[0011] In some embodiments, an opening is provided on the side wall of the air outlet of the fan assembly. The ventilation duct includes an air inlet section. The air inlet section is arranged inside the box body, and an outward protruding extension is provided at a position facing the opening. An air inlet is provided on the bottom surface of the extension. After the extension passes through the opening, it extends into the air outlet, and the air inlet is arranged facing the air outlet direction of the fan assembly.

[0012] In some embodiments, the ventilation duct further includes an air outlet section arranged inside the smoke collecting hood. The air inlet of the air inlet section extends downward into the smoke collecting hood, and the air outlet section is communicated with the air inlet of the air inlet section and the central air duct respectively.

[0013] In some embodiments, the central air duct has an independent left air supply duct and right air supply duct. One row of the exhaust holes arranged vertically and exhausting air forward is provided on the front of each of the left air supply duct and the right air supply duct; the air outlet section includes an independent left air outlet section and right air outlet section. The left air outlet section is communicated with the left air supply duct, and the right air outlet section is communicated with the right air supply duct.

[0014] In some embodiments, a filter for filtering the air flowing into the air inlet section is provided at the air inlet.

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

[0016] 1. For the range hood of the present invention, the gas ejected from the exhaust holes of the central air duct can form a central air curtain, and under the combined action of the air box device, the central air curtain and the swirling surface of the central air duct, a unique spiral upward air flow is formed to prevent the diffusion and escape of oil fumes, achieving an efficient effect of collecting and sucking oil fumes.

[0017] 2. For the range hood of this embodiment, by using a part of the air flow flowing out from the air outlet of the fan assembly to supply air to the exhaust holes of the central air duct, the utilization rate of the fan assembly is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the 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 an exploded view of the range hood in Embodiment 1 of the present invention, with the back plate of the smoke collecting hood hidden in the figure;

[0021] Figure 4 is a cross-sectional view of the range hood in Embodiment 1 of the present invention;

[0022] Figure 5 is a schematic structural diagram of the air inlet section in Embodiment 1 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following embodiments are used to illustrate the present invention, but the present invention is not limited by these embodiments. Modifying the specific implementation manner of the present invention or making equivalent replacements for some technical features without departing from the spirit of the present invention scheme shall be covered within the scope of the technical solution claimed by the present invention.

[0024] Embodiment 1

[0025] As Figure 1-2As shown in the figure, an oil fume suction machine with a central air curtain according to this embodiment includes a smoke collecting hood 1 and a wind box device 2. The smoke collecting hood 1 has a smoke inlet part 11 and a smoke guiding part 12 located 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 is provided with a smoke outlet 112. On the front smoke guiding surface 121 of the smoke guiding part 12, a vertical central air duct 4 that divides the smoke guiding surface 121 into two parts is convexly provided. The opposite side walls of the central air duct 4 are swirling surfaces 41 for making the airflow flowing through it rotate. The central air duct 4 is provided with at least one row of exhaust holes 401 arranged vertically and discharging air forward. The airflow ejected from the exhaust holes 401 forms a central air curtain that can drive the surrounding airflow to flow. The wind box device 2 includes a box body 21 and a fan assembly 22. The box body 21 is arranged on the top of the smoke collecting hood 1 and is communicated with the smoke outlet 112. The fan assembly 22 is arranged in the box body 21 for sucking oil fume and forming an upward axial suction force on the swirling gas. And the air outlet 221 of the fan assembly 22 is respectively communicated with the oil fume suction machine exhaust pipe and the central air duct 4 for delivering gas to the exhaust holes 401. Preferably, the fan assembly 22 is a volute fan assembly.

[0026] When the oil fume suction machine works, the fan assembly 22 of the wind box device 2 starts. The upward axial suction force generated by the fan assembly 22 drives the external airflow and oil fume to flow into the interior of the smoke inlet part 11 of the smoke collecting hood 1 from the smoke inlet area 111, enters the interior of the fan assembly 22 through the smoke outlet 112, and then flows through the oil fume suction machine exhaust pipe from the air outlet 221 of the fan assembly 22 and is discharged outdoors. When the airflow flows through the air outlet 221 of the fan assembly 22, part of the airflow flows into the central air duct 4 and then ejects from the exhaust holes 401. Due to the gas viscosity effect, the gas ejected from the exhaust holes 401 forms a central air curtain, which can not only cut the oil fume into different areas, but also drive the surrounding airflow to flow together and generate a radial force. The airflow forms a swirling gas under the cooperation of the swirling surface 41, and forms a spiral upward airflow under the cooperation of the upward axial suction force generated by the fan assembly 22, so that the oil fume is sucked and gathered upward in a spiral before diffusion, preventing the oil fume from diffusing and escaping and improving the rotating oil fume suction effect.

[0027] The oil fume suction machine of this embodiment improves the utilization rate of tail gas by using part of the airflow flowing out of the air outlet 221 of the fan assembly 22 to provide gas source for the exhaust holes 401 of the central air duct 4. In addition, the gas ejected from the exhaust holes 401 of the central air duct 4 can form a central air curtain, and a unique spiral upward airflow is formed through the common cooperation of the wind box device 2, the central air curtain and the swirling surface 41 of the central air duct 4, preventing the oil fume from diffusing and escaping and achieving the effects of efficient oil fume gathering and rotating oil fume suction.

[0028] Specifically, the smoke guiding part 12 of the smoke collecting hood 1 is located at the rear side of the bottom surface of the smoke inlet part 11, and the back surfaces of the two are in the same plane, so that the smoke inlet part 11 and the smoke guiding part 12 form a "7" shape, and the front side of the bottom surface of the smoke inlet part 11 is used to prevent oil fume from escaping upward. The smoke inlet area 111 is arranged at the front side of the bottom surface of the smoke inlet part 11, so that the spiral upward air flow can flow into the interior of the smoke inlet part 11 through the smoke inlet area 111, and the smoke outlet 112 is arranged in the middle of the top surface of the smoke inlet part 11. Preferably, the smoke inlet area 111 is composed of a number of smoke inlet holes 101. In this way, the smoke inlet area 111 can act as an oil net. On the one hand, the effect of separating oil and fume can be achieved. On the other hand, the oil net can be omitted, the assembly process can be simplified, and the manufacturing cost can be reduced.

[0029] As Figure 1-2 shown, in this embodiment, the central air duct 4 is vertically arranged at the central position of the smoke guiding surface 121 on the front surface of the smoke guiding part 12 and divides the smoke guiding surface 121 into a symmetric left smoke guiding surface 121 and a right smoke guiding surface 121. And the central air duct 4 extends from the bottom of the smoke guiding part 12 towards the bottom surface of the smoke inlet part 11 and divides the smoke inlet area 111 into two parts. In this way, the left smoke guiding surface 121 and the left smoke inlet area 111 correspond to the cookware on the left burner of the cooker, and the right smoke guiding surface 121 and the right smoke inlet area 111 correspond to the cookware on the right burner of the cooker, which is convenient to control the working state of the exhaust holes 401 of the central air duct 4 according to the specific use conditions of the left and right burners of the cooker, and ensure the high-efficiency swirling and sucking of oil fume effect.

[0030] Specifically, the cross-sectional area of the central air duct 4 in the horizontal direction linearly increases from bottom to top. The side wall or the swirling surface 41 of the central air duct 4 is an inclined surface or an arc surface extending from the front surface of the smoke guiding part 12 towards the direction of the exhaust holes 401, and the cross-sectional area of the inclined surface or the arc surface in the horizontal direction linearly increases from bottom to top, so that both the left smoke guiding surface 121 and the right smoke guiding surface 121 linearly increase from bottom to top. In this way, under the combined action of the side wall or the swirling surface 41 of the central air duct 4, the air flow forms a tornado effect, which is beneficial to strengthening the swirling and gathering effect of oil fume.

[0031] Preferably, the side wall or the swirling surface 41 of the central air duct 4 is an arc surface, which bends towards the inside of the central air duct 4 or towards the outside of the side wall of the central air duct 4. More preferably, in this embodiment, the side wall or the swirling surface 41 of the central air duct 4 is an arc surface bending towards the inside of the central air duct 4, and the arc length of the arc surface in any horizontal section is one-fourth of the arc, so as to ensure the best effect of the formed rotating air flow, and further ensure the more efficient rotating smoking of the range hood.

[0032] Specifically, a transition surface 42 is provided between the opposite side walls of the central airway 4. The transition surface 42 is arranged to be inclined upward and forward, which is beneficial to increasing the arc length of the variable-diameter arc surface in the horizontal cross-section, and thus beneficial to enhancing the gas turning and rotating effect. At least one row of exhaust holes 401 arranged vertically and discharging air forward is provided on the transition surface 42 to cut the oil fume into at least two regions.

[0033] Preferably, the transition surface 42 of this embodiment is a plane. One row of exhaust holes 401 arranged vertically and discharging air forward is provided on each of the left and right sides of the plane. The gas ejected from the two rows of exhaust holes 401 forms two central air curtains on the left and right. On the one hand, it can cut the oil fume into three regions. On the other hand, it can drive the surrounding gas to flow under the action of the adhesion effect and cooperate with the variable-diameter arc-shaped swirling surface 41 to form a rotating air flow. On the third hand, it can accelerate the swirling effect of the gas ejected from the exhaust holes 401 and enhance the strength of the spiral upward air flow. In other embodiments, the transition surface 42 can also be an arc-shaped surface that bends forward and outward, and one row of exhaust holes 401 arranged vertically and discharging air forward is provided on the arc-shaped surface.

[0034] More preferably, the distance L between the left edge of the plane-shaped transition surface 42 and the center point of any exhaust hole 401 on the left is less than 20 mm, and the distance L between the right edge of the plane-shaped transition surface 42 and the center point of any exhaust hole 401 on the right is less than 20 mm. In this way, while ensuring that the air flow ejected from the exhaust holes 401 can form a central air curtain, it can effectively drive the air flow on the side wall of the central airway 4 (i.e., the swirling surface 41) to flow together, and thus ensure the best effect of the formed spiral upward air flow.

[0035] As Figure 3 shown, in this embodiment, the central airway 4 has independent left air supply channels 43 and right air supply channels 44. One row of exhaust holes 401 arranged vertically and discharging air forward is provided on the front of each of the left air supply channel 43 and the right air supply channel 44. Specifically, the left air supply channel 43 is formed by enclosing a gas supply cavity (not shown in the figure) provided inside the smoke collecting hood 1 and having an opening on one side and the left side of the center line in the up and down direction of the plane-shaped transition surface 42. The right air supply channel 44 is formed by enclosing a gas supply cavity provided inside the smoke collecting hood 1 and having an opening on one side and the right side of the center line in the up and down direction of the plane-shaped transition surface 42.

[0036] As Figure 3-5As shown in the figure, further, it further includes a ventilation duct 6. One end of the ventilation duct 6 is arranged inside the box body 21 and communicated with the air outlet 221 of the fan assembly 22, and the other end is arranged inside the smoke collecting hood 1 and communicated with the left air supply duct 43 and the right air supply duct 44 respectively. Specifically, an opening 222 is provided 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 inside the box body 21 and has an outwardly protruding extension 611 at a position facing the opening 222. An air inlet 6111 is provided on the bottom surface of the extension 611. The extension 611 passes through the opening 222 and extends into the air outlet 221. The air inlet 6111 is arranged in the air outlet direction of the fan assembly 22. In this way, when the flue gas flows upward through the air outlet 221 of the fan assembly 22, it is convenient for part of the flue gas to flow through the air inlet 6111, flow through the air inlet section 61, and supply air source to the central air duct 4 and the side air duct 5.

[0037] Preferably, the opening 222 is rectangular to increase the unit air intake. More preferably, to prevent the ventilation duct 6, the left air supply duct 43 and the right air supply duct 44 from being polluted by lampblack and causing the exhaust hole 401 to be blocked, a filter for filtering the air flow flowing into the air inlet section 61 can be added at the air inlet 6111.

[0038] Further, the ventilation duct 6 further includes an air outlet section 62 and a connection section 63 arranged inside the smoke collecting hood 1. The air inlet 6112 of the air inlet section 61 extends downward into the smoke collecting hood 1. The connection section 63 is communicated with the air inlet 6112 of the air inlet section 61 and the air outlet section 62 respectively. The air outlet section 62 is communicated with the left air supply duct 43 and the right air supply duct 44 respectively. Preferably, in this embodiment, the air outlet section 62 includes an independent left air outlet section and a right air outlet section (not shown in the figure). The left air outlet section is communicated with the connection section 63 and the left air supply duct 43 respectively, and the right air outlet section is communicated with the connection section 63 and the right air supply duct 44 respectively.

[0039] Furthermore, to independently control the working states of the left center air curtain and the right center air curtain, a control valve (not shown in the figure) for controlling the on-off of the left air outlet section and the right air outlet section can be added on the connection section 63, so as to facilitate the user to control the air outlet conditions of the left air outlet section and the right air outlet section according to the use states of the left and right burners of the cooking stove, and then realize the spiral upward air flow on the left and right sides, improve the use flexibility, and be beneficial to efficient smoke collection and avoid energy waste.

[0040] Embodiment 2

[0041] The difference between this embodiment and Embodiment 1 lies in that it further includes a air supply device, which is arranged on the top or side wall of the smoke collecting hood 1 and its air supply outlets are respectively communicated with the left air supply channel 43 and the right air supply channel 44 for supplying gas to the exhaust holes 401. It can be seen that by adding the air supply device, the unit air output of the exhaust holes 401 can be increased, and then the intensity of the rotating upward air flow can be enhanced to improve the smoke gathering and rotating smoking effects.

[0042] Furthermore, the number of the air supply devices is two. One air supply device is installed on the left side of the top of the smoke collecting hood 1 and its air supply outlet is communicated with the left air supply channel 43, and the other air supply device is installed on the right side of the top of the smoke collecting hood 1 and its air supply outlet is communicated with the right air supply channel 44. In this way, through the two independent air supply devices, the efficient smoke gathering and rotating smoking effects on the left and right sides can be independently controlled, making the use of the range hood more flexible and avoiding energy waste.

[0043] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A range hood with a central air curtain, comprising a smoke collecting hood (1) and a blower box device (2). The smoke collecting hood (1) has a smoke inlet part (11) and a smoke guiding part (12) located below the smoke inlet part (11). A smoke inlet area (111) is provided at the bottom of the smoke inlet part (11), and a smoke outlet (112) is provided at the top. The smoke inlet area (111) is composed of a plurality of smoke inlet holes. The blower box device (2) includes a box body (21) and a blower assembly (22) arranged inside the box body (21). The box body (21) is arranged on the top of the smoke collecting hood (1) and is communicated with the smoke outlet (112). It is characterized in that, On the smoke guiding surface (121) on the front of the smoke guiding part (12), a vertical central air passage (4) that bisects the smoke guiding surface (121) protrudes. The central air passage (4) is provided with at least one row of exhaust holes (401) arranged vertically and discharging air forward, and the opposite side walls of the central air passage (4) are swirling surfaces (41) for making the airflow flowing through it rotate; The air outlets (221) of the fan assembly (22) are respectively communicated with the smoke exhaust pipe of the range hood and the central air passage (4) for delivering gas to the exhaust holes (401); The central air passage (4) extends from the bottom of the smoke guiding part (12) towards the bottom surface of the smoke inlet part (11) and bisects the smoke inlet area (111). The swirling surface (41) is an arc surface extending from the front of the smoke guiding part (12) towards the direction of the exhaust holes (401), and the cross-sectional area of the arc surface in the horizontal direction linearly increases from bottom to top; A transition surface (42) is provided between the opposite side walls of the central air passage (4). The transition surface (42) is arranged obliquely upward and forward, and at least one row of the exhaust holes (401) arranged vertically and discharging air forward are provided on the transition surface (42).

2. The range hood with a central air curtain according to claim 1, wherein, The arc surface bends towards the inside of the central air passage (4), and the arc length of the arc surface in any horizontal section is one-fourth of the arc.

3. The range hood with a central air curtain according to claim 1, characterized in that, The transition surface (42) is an arc surface bending forward and outward, and one row of the exhaust holes (401) arranged vertically and discharging air forward are provided on the arc surface; or, the transition surface (42) is a plane, and one row of the exhaust holes (401) arranged vertically and discharging air forward are respectively provided on the left and right sides of the plane.

4. The range hood with a central air curtain according to any one of claims 1-3, characterized in that, It further includes a ventilation duct (6). One end of the ventilation duct (6) is arranged in the box body (21) and communicated with the air outlet (221) of the fan assembly (22), and the other end is arranged in the smoke collecting hood (1) and communicated with the central air passage (4).

5. The range hood with a central air curtain according to claim 4, characterized in that, An opening (222) is provided on the 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 body (21) and has an outward protruding extension part (611) at a position facing the opening (222). An air inlet (6111) is provided on the bottom surface of the extension part (611). The extension part (611) extends into the air outlet (221) after passing through the opening (222), and the air inlet (6111) is arranged towards the air outlet direction of the fan assembly (22).

6. The range hood with a central air curtain according to claim 5, wherein, The ventilation duct (6) further includes an air outlet section (62) arranged in the smoke collecting hood (1). The air inlet outlet (6112) of the air inlet section (61) extends downward into the interior of the smoke collecting hood (1), and the air outlet section (62) is respectively communicated with the air inlet outlet (6112) of the air inlet section (61) and the central air passage (4).

7. The range hood with a central air curtain according to claim 6, characterized in that, The central airway (4) has a left air supply airway (43) and a right air supply airway (44) that are independent of each other. A row of the exhaust holes (401) that are vertically arranged and discharge air forward are respectively provided on the fronts of the left air supply airway (43) and the right air supply airway (44); the air outlet section (62) includes a left air outlet section and a right air outlet section that are independent of each other. The left air outlet section is communicated with the left air supply airway (43), and the right air outlet section is communicated with the right air supply airway (44).

8. The range hood with a central air curtain according to claim 5, wherein, A filter for filtering the air flow flowing into the air inlet section (61) is provided at the air inlet (6111).

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