Open type range hood capable of reducing air leakage

Abstract

The invention discloses an open type range hood capable of reducing air leakage, the range hood is provided with an air suction panel, the air suction panel is provided with an air suction opening and an air return baffle side, the inner side of the air return baffle side is provided with an air return duct, and airflow flowing outwards along the air suction panel flows back to the area of the air suction panel again and finally enters the air suction opening under the guiding action of the air return duct. According to the Bernoulli effect, the higher the air speed is, the lower the pressure is, when the air speed reaches a certain value, peripheral air can be sucked around the air outlet edge of the air return duct, the sucked peripheral air forms a shielding air curtain, oil smoke leakage can be further reduced, and the oil smoke leakage can be further reduced. The scheme provided by the invention can be applied to range hoods with any structures, only proper suction force is needed, large suction force is not needed, and the effects of saving energy, reducing carbon, saving electricity and reducing noise can be achieved.

Description

Technical Field

[0001] This invention relates to a kitchen ventilation and smoke extraction device, and more particularly to a range hood. Background Technology

[0002] Existing range hoods include closed and open types. Closed range hoods, such as the one disclosed in CN205991532U, have a relatively ideal smoke extraction effect, but they are lacking in aesthetics and convenience of kitchen operation. Common open range hoods have three types of structures: the first type, such as the one disclosed in CN212615441U, has a slanted suction panel; the second type, such as the one disclosed in CN220453747U, has a "7"-shaped suction panel; and the third type, such as the one disclosed in CN207438688U, has a flat suction panel. These types of open range hoods share a common drawback: the smoke extraction effect in the middle of the suction panel is good, but the four corners have serious air leakage, especially the four corners near the user end, resulting in a smoke extraction effect that is far inferior to that of closed range hoods. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides an open-type range hood that can reduce air leakage and improve the oil fume purification effect.

[0004] The first technical solution adopted by the present invention to solve its technical problem is: An open-type range hood with reduced air leakage has an air intake panel with an air intake. Two return air baffles protruding from the front corners of the air intake panel are provided. A return air duct is provided on the inner side of the return air baffle, and the return air duct has an inlet side and an outlet side. A perpendicular line is drawn along the edge of the outlet side, perpendicular to the air intake panel, with the side having the air intake being the inner side of the perpendicular line. At least a portion of the return air duct is located on the outer side of the perpendicular line.

[0005] The second technical solution adopted by the present invention to solve its technical problem is: An open-type range hood with reduced air leakage has an air intake panel with an air intake. A return air baffle protrudes from the front of the air intake panel, extending to both sides of the air intake panel and covering two corners on the front side. A return air duct is located inside the return air baffle, having an inlet side and an outlet side. A perpendicular line is drawn along the edge of the outlet side, perpendicular to the air intake panel, with the side having the air intake being the inner side of the perpendicular line. At least a portion of the return air duct is located outside the perpendicular line.

[0006] The third technical solution adopted by the present invention to solve its technical problem is: An open-type range hood with reduced air leakage has an air intake panel with an air intake. The air intake panel has return air baffles protruding from the four corners of the air intake panel. A return air duct is provided on the inner side of the return air baffle. The return air duct has an air inlet side and an air outlet side. A perpendicular line is drawn along the edge of the air outlet side, perpendicular to the air intake panel. The side with the air intake is the inner side of the perpendicular line. At least a portion of the return air duct is located on the outer side of the perpendicular line.

[0007] The fourth technical solution adopted by this invention to solve its technical problem is: An open-type range hood with reduced air leakage has an air intake panel with an air intake. The air intake panel has a closed return air baffle protruding from the air intake panel and covering the four corners of the air intake panel. A return air duct is provided on the inner side of the return air baffle. The return air duct has an air inlet side and an air outlet side. A perpendicular line is drawn along the edge of the air outlet side, perpendicular to the air intake panel. The side with the air intake is the inner side of the perpendicular line. At least a portion of the return air duct is located on the outer side of the perpendicular line.

[0008] In all the above solutions, the angle formed by the tangent of the air outlet edge and the plane where the air intake panel is located is an acute angle.

[0009] In the above solutions, the optimal configuration is that the air inlet edge is flush with the air intake panel.

[0010] In the above scheme, the cross-section of the return air duct can be arc-shaped, an inwardly inclined surface at the air outlet, a polygonal surface composed of at least two inclined surfaces, or an irregular surface composed of an arc-shaped surface and an inclined surface, etc.

[0011] The beneficial effects of this invention are as follows: A return air baffle is provided on the suction panel, and a return air duct is provided on the inner side of the return air baffle. The airflow flowing outward along the suction panel is guided by the return air duct and flows back to the suction panel area, eventually entering the suction port. The greater the airflow flowing outward along the suction panel, the faster the flow velocity leaves the return air duct. According to Bernoulli's effect, the faster the wind speed, the lower the pressure. When the wind speed reaches a certain value, it will draw in peripheral air around the air outlet edge of the return air duct. The drawn-in peripheral air forms a shielding air curtain, which can further reduce oil fume leakage. The solution of this invention can be applied to any type of range hood, requiring only appropriate suction power, not high suction power, achieving energy saving, carbon reduction, power saving, and noise reduction effects. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1This is a schematic diagram of the first implementation method of the return air baffle.

[0014] Figure 2 This is a schematic diagram of the second implementation method of the return air baffle.

[0015] Figure 3 This is a schematic diagram of the third implementation method of the return air baffle.

[0016] Figure 4 This is a schematic diagram of the fourth implementation method of the return air baffle.

[0017] Figure 5 This is a schematic diagram of the fifth implementation method of the return air baffle.

[0018] Figure 6 This is a cross-sectional view of the range hood in the embodiment.

[0019] Figure 7 yes Figure 6 Enlarged view of point A in the middle.

[0020] Figure 8 This is a schematic diagram of the second implementation method of the return air duct.

[0021] Figure 9 This is a schematic diagram of the third implementation method of the return air duct.

[0022] Figure 10 This is a schematic diagram of the third implementation method of the return air duct.

[0023] Figure 11 This is a schematic diagram of airflow. Detailed Implementation

[0024] The first embodiment of the present invention is described in [reference needed]. Figure 1 , Figure 6 The range hood has a housing 8 and a suction panel 1. A fan 9 is installed inside the housing 8. The suction panel 1 is installed on the housing 8 and has a suction port 2. At the two corners 3 on the front side of the suction panel 1, there are return air baffles 4 protruding from the suction panel. Figures 1 to 5 In the diagram, the black-filled area represents the return air baffle. The return air baffle 4 is located at the edge of the suction panel 1, and a return air duct 5 is provided on the inner side of the return air baffle 4. The positions of both ends of the return air baffle 4 can be flexibly set as needed.

[0025] Generally, the rear side of the suction panel 1 is the side closest to the wall where it is installed, the front side of the suction panel 1 is the side closest to the user, and the two sides refer to the parts located between the rear and the front sides. The same applies to the following embodiments.

[0026] See the second embodiment of the present invention. Figure 2 , Figure 3 , Figure 6 The range hood has an air intake panel 1 with an air intake 2. A return air baffle 4 protrudes from the front of the air intake panel 1, extending to both sides of the air intake panel 4 and covering the two corners 3 at the front of the air intake panel 1. A return air duct 5 is located on the inner side of the return air baffle 4. The positions of the two ends of the return air baffle 4 can be as follows: Figure 2 As shown, parts extending to the sides, such as the upper, middle, or lower parts, can also be as follows: Figure 3 As shown, it covers the entire side.

[0027] See the third embodiment of the present invention. Figure 4 , Figure 6 The range hood has an air intake panel 1 with an air intake 2. At the four corners 3 of the air intake panel 1, there are return air baffles 4 protruding from the air intake panel 1. The return air baffles 4 have return air ducts 5 on their inner sides. The positions of the two ends of the return air baffles 4 can be flexibly set as needed.

[0028] See the fourth embodiment of the present invention. Figure 5 , Figure 6 The range hood has an air intake panel 1 with an air intake 2. The air intake panel 1 has a closed return air baffle 4 protruding from the air intake panel 1. The return air baffle 4 covers the four corners 3 of the air intake panel. The return air duct 5 is provided on the inner side of the return air baffle 4. That is, the entire return air baffle 4 is a closed frame.

[0029] Figure 6 This is a cross-sectional view of the range hood in this embodiment. See also... Figure 7 As shown, the return air duct 5 has an air inlet edge 6 and an air outlet edge 7. A vertical line L1 perpendicular to the air intake panel 1 is drawn along the edge of the air outlet edge 7. The side with the air intake 2 is the inner side of the vertical line. At least a portion of the return air duct 5 is located outside the vertical line L1. In this application, the edge of the air outlet edge 7 refers to the part where the airflow last contacts the return air duct 5 when the airflow leaves the return air duct 5. This part can be understood as a line. The dividing line between the inner and outer sides in this application can be understood as the surface where the edge of the air outlet edge 7 and the vertical line L1 are located. The surface where the edge of the air outlet edge 7 and the vertical line L1 are located is the boundary. The side with the air intake 2 is the inner side, and the other side is the outer side. At least a portion of the return air duct 5 is located outside the vertical line L1. This can be understood as at least a portion of the return air duct 5 being located outside the surface where the edge of the air outlet edge 7 and the vertical line L1 are located. A small portion can be understood as the return air duct 5 being located entirely outside the vertical line L1, or any part of its upper, lower, or middle section being located outside the vertical line L1.

[0030] Furthermore, in the above embodiments, see... Figures 7 to 10 The angle α formed by the tangent L2 of the air outlet edge 7 and the plane P on which the air intake panel 1 is located is an acute angle. This ensures that the outward leakage air is guided by the return air duct 5 and the airflow returns to the air intake panel 1.

[0031] Furthermore, in the above embodiments, the air inlet edge 6 is flush with the air intake panel 1, and the inner wall of the return air baffle 4 can be integrally bent from the air intake panel or it can be a separate component. After installation, it is flush with the air inlet edge 6 and the air intake panel 1, so that the airflow can smoothly enter the return air duct 5.

[0032] The cross-section of the return air duct of this invention can have various shapes, such as... Figure 7 As shown, the cross-section of the return air duct 5 is arc-shaped, as... Figure 8 As shown, the cross-section of the return air duct 5 is an inwardly sloping surface at the air outlet edge, as... Figure 9 As shown, the cross-section of the return air duct 5 is a polygonal surface composed of at least two inclined planes, as... Figure 10 As shown, the cross-section of the return air duct 5 is an irregularly shaped surface consisting of an arc-shaped surface at the top and a sloping surface at the bottom. Of course, it can also be set to other shapes.

[0033] This invention features a return air baffle on the air intake panel, with a return air duct located on the inner side of the return air baffle. Figure 11 As shown, the airflow flowing outward along the suction panel is guided by the return air duct and flows back to the suction panel area, eventually entering the suction port. The greater the airflow flowing outward along the suction panel, the faster the flow velocity leaves the return air duct. According to Bernoulli's effect, the faster the wind speed, the lower the pressure. When the wind speed reaches a certain value, it will draw in peripheral air around the air outlet edge of the return air duct. The drawn-in peripheral air forms a shielding air curtain, which can further reduce oil fume leakage. The solution of this invention can be applied to any type of range hood, requiring only appropriate suction power, not high suction power, and can achieve the effects of energy saving, carbon reduction, power saving, and noise reduction.

[0034] The above embodiments do not limit the scope of protection of this invention. All equivalent modifications and variations made by those skilled in the art without departing from the overall concept of this invention are still within the scope of this invention.

Claims

1. An open-type range hood that reduces air leakage, the range hood having an air intake panel with an air intake vent, characterized in that... At the two corners on the front side of the air intake panel, there are return air baffles protruding from the air intake panel. A return air duct is provided on the inner side of the return air baffle. The return air duct has an air inlet side and an air outlet side. A vertical line perpendicular to the air intake panel is drawn along the edge of the air outlet side. The side with the air intake is the inner side of the vertical line. At least a part of the return air duct is located on the outer side of the vertical line.

2. An open-type range hood that reduces air leakage, the range hood having an air intake panel with an air intake vent, characterized in that... The front side of the suction panel is provided with a return air baffle that protrudes from the suction panel. The two ends of the return air baffle extend to both sides of the suction panel and cover the two corners of the front side of the suction panel. A return air duct is provided on the inner side of the return air baffle. The return air duct has an air inlet side and an air outlet side. A perpendicular line is drawn along the edge of the air outlet side, perpendicular to the suction panel. The side with the air inlet is the inner side of the perpendicular line. At least a portion of the return air duct is located on the outer side of the perpendicular line.

3. An open-type range hood that reduces air leakage, the range hood having an air intake panel with an air intake vent, characterized in that... At the four corners of the air intake panel, there are return air baffles protruding from the air intake panel. A return air duct is provided on the inner side of the return air baffle. The return air duct has an air inlet side and an air outlet side. A vertical line perpendicular to the air intake panel is drawn along the edge of the air outlet side. The side with the air intake is the inner side of the vertical line. At least a part of the return air duct is located on the outer side of the vertical line.

4. An open-type range hood that reduces air leakage, the range hood having an air intake panel with an air intake vent, characterized in that... The air intake panel is provided with a closed return air baffle that protrudes from the air intake panel. The return air baffle covers the four corners of the air intake panel. A return air duct is provided on the inner side of the return air baffle. The return air duct has an air inlet side and an air outlet side. A vertical line perpendicular to the air intake panel is drawn along the edge of the air outlet side. The side with the air intake is the inner side of the vertical line. At least a part of the return air duct is located on the outer side of the vertical line.

5. The open-type range hood with reduced air leakage according to any one of claims 1 to 4, characterized in that... The angle formed by the tangent of the air outlet edge and the plane where the air intake panel is located is an acute angle.

6. The open-type range hood with reduced air leakage according to any one of claims 1 to 4, characterized in that... The air inlet edge is flush with the air intake panel.

7. The open-type range hood with reduced air leakage according to any one of claims 1 to 4, characterized in that... The cross-section of the return air duct is arc-shaped.

8. The open-type range hood with reduced air leakage according to any one of claims 1 to 4, characterized in that... The cross-section of the return air duct is an inwardly inclined surface at the air outlet side.

9. The open-type range hood with reduced air leakage according to any one of claims 1 to 4, characterized in that... The cross-section of the return air duct consists of at least two inclined planes.

10. The open-type range hood with reduced air leakage according to any one of claims 1 to 4, characterized in that... The cross-section of the return air duct is composed of an arc-shaped surface and an inclined surface.

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