A range hood

Abstract

The present invention relates to a range hood, comprising a shell and a fan system arranged in the shell, characterized in that: the lower part of the shell has a vertically extending smoke inlet chamber, the front side wall of the lower part of the shell is provided with a smoke inlet connected to the smoke inlet chamber, the front side of the shell is provided with a smoke baffle arranged near the upper edge of the smoke inlet, the upper edge of the smoke inlet is provided with a guide structure capable of reducing the flow rate of inlet oil smoke, and the guide structure has at least a first guide plate gradually tilted backward from top to bottom. The guide structure arranged at the upper edge of the smoke inlet of the present invention can form an airflow buffer zone together with the smoke baffle, reduce the speed of rapidly rising oil smoke, and make the oil smoke generate a short bypass after passing through the smoke inlet and entering the smoke inlet chamber, and then be sucked away and quickly discharged, thereby improving the oil smoke suction effect and reducing the pneumatic noise at the smoke inlet.

Description

Technical Field

[0001] The invention relates to the technical field of kitchen appliances, in particular to a range hood. Background Art

[0002] Range hoods are an indispensable appliance in the kitchen today. The more common and widely used ones are the upper exhaust fume purification systems.

[0003] At present, the upper exhaust fume purification system is mainly divided into two categories: top suction range hood and close suction range hood. Top suction range hood is more beautiful, but its smoke inlet is higher and the smoke extraction effect is limited; compared with top suction range hood, close suction range hood has a lower smoke inlet, but due to the influence of the appearance structure and internal air duct structure of close suction range hood, the current close suction range hood cannot get closer to the smoke, which greatly limits its smoke extraction effect.

[0004] For a vertically arranged smoke inlet duct, if the smoke inlet port is located at the front side of the smoke inlet duct and arranged perpendicularly to the smoke inlet duct, when the rising oil smoke enters the smoke inlet duct from the smoke inlet port, the fluids will collide with each other at the entrance of the smoke inlet duct when they turn quickly, causing gas reflux, energy loss and aerodynamic noise. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a range hood which improves the oil fume extraction effect by making the smoke inlet sufficiently close to the oil fume source in view of the current status of the prior art.

[0006] Another technical problem to be solved by the present invention is to provide a range hood that can buffer the inlet oil smoke to avoid the formation of vortexes and thus reduce noise and improve the oil smoke extraction effect in view of the current status of the prior art.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a range hood, comprising a shell and a fan system arranged in the shell, characterized in that: the lower part of the shell has a vertically extending smoke inlet chamber, the front side wall of the lower part of the shell is provided with a smoke inlet port connected to the smoke inlet chamber, the front side of the shell is provided with a smoke baffle arranged near the upper edge of the smoke inlet port, the upper edge of the smoke inlet is provided with a guide structure capable of reducing the flow rate of the inlet oil smoke, and the guide structure has at least a first guide plate which is gradually inclined backward from top to bottom.

[0008] Preferably, a smoke guiding structure protruding backward is provided on the inner front wall of the smoke inlet chamber, and the smoke guiding structure is located above the flow guiding structure. Since the smoke inlet of the present invention is perpendicular to the smoke inlet chamber, when the oil smoke gathers downward under the action of the smoke baffle and enters the smoke inlet chamber, it is easy to cause local collision and accumulation of oil smoke due to sudden change in flow direction. After the above-mentioned smoke guiding structure is provided, the oil smoke entering the smoke inlet chamber can flow along the rear wall of the smoke guiding structure, so as to reduce the local collision and accumulation of oil smoke at the inner edge of the smoke inlet due to sudden change in flow direction, which is conducive to improving the oil smoke absorption effect.

[0009] Further preferably, the smoke guide structure has a vertically arranged plane and an inclined surface gradually extending outward from the edge of the plane. The inclined surface can further reduce the impact between the oil smoke and the smoke guide structure, which is conducive to smoother flow of the oil smoke.

[0010] As an improvement, the lower edge of the first guide plate is connected with a second guide plate that gradually tilts upward from front to back. Although the above-mentioned smoke guide structure is conducive to improving the flow effect of oil smoke in the smoke inlet chamber, a detour area will be formed between the lower end of the smoke guide structure and the smoke inlet. When the rising oil smoke enters the smoke inlet chamber from the smoke inlet, a vortex will be formed in the above-mentioned detour area when the fluid turns rapidly, resulting in gas reflux, energy loss and aerodynamic noise; at the same time, the disturbed airflow continues to run upward and touch the smoke guide structure. If the inclination, front and rear width, etc. of the smoke guide structure are not set reasonably, it will cause airflow disturbance again, which will have a negative impact on the oil smoke absorption effect. In order to solve the above problems, the present invention is provided with a second guide plate, which can guide the direction of the oil smoke after changing direction through the first guide plate again, so that a large amount of oil smoke avoids the detour area, avoids the formation of vortices in the detour area, and reduces the direct impact intensity of the oil smoke and the smoke guide structure, so as to reduce the energy loss and aerodynamic noise of the oil smoke in the smoke inlet chamber. In addition, a V-shaped oil guide groove is formed between the second guide plate and the first guide plate, so that the oil flowing down from the front wall of the smoke inlet chamber can flow through the two ends of the V-shaped guide groove to the oil cup below it, thereby preventing oil droplets from directly dripping downward from the front wall of the smoke inlet chamber through the smoke inlet port, affecting the consumer's visual experience.

[0011] Preferably, when the intersection line between the inclined surface and the plane where the second guide plate is located is located on the front side of the plane, the obtuse angle between the inclined surface and the second guide plate is d, and 110°≤d≤180°. Maintaining the angle within this range can make the oil smoke follow the trajectory after flowing through the second guide plate, so that it contacts the inner rear wall of the smoke guide structure in a more gentle manner, so that the oil smoke maintains a relatively gentle movement trajectory as a whole after being sucked into the smoke inlet cavity from the smoke inlet port, avoiding obvious changes in the direction of the airflow, and facilitating the smooth flow of the airflow. When the intersection line between the extended surface of the second guide plate and the lower inclined surface of the smoke guide structure is located on the rear side of the plane, most of the oil smoke will not directly collide with the smoke guide structure after passing through the second guide plate. The smoke guide structure shortens the cross-sectional dimensions of the front and rear flow channels of the smoke inlet cavity, thereby accelerating the velocity of the passing airflow and further improving the oil smoke extraction effect of the range hood.

[0012] In the above schemes, the width of the smoke guide structure in the front-to-back direction is L1, the projection width of the inclined plane on the vertical plane is L2, and the acute angle between the inclined plane and the vertical plane is b, b=arctan(L1 / L2)~60°. Further preferably, 30°≤b≤60°. The use of such parameter settings is conducive to significantly reducing the local impact and accumulation of oil smoke at the inner edge of the smoke inlet due to the sudden change of flow direction, thereby improving the oil smoke absorption effect.

[0013] Preferably, the angle between the second guide plate and the front side wall of the smoke inlet chamber is α, 15°≤α≤70°. More preferably, 20°≤α≤30°. The distance between the junction of the first guide plate and the second guide plate and the rear wall of the smoke inlet chamber is s, and the vertical height of the second guide plate is h, 2mm≤h×sinα≤s / 3. 90mm≤s≤110mm. Such a design is conducive to avoiding the formation of vortexes, improving the fume absorption effect, and reducing noise.

[0014] Preferably, when the smoke baffle is arranged horizontally, the height between the joint of the first guide plate and the second guide plate and the lower wall of the smoke baffle is H, 10mm≤H≤40mm. The angle between the first guide plate and the horizontal plane is c, 30°≤c≤60°. With this structure, the smoke baffle gathers the oil smoke and enters the smoke inlet, and further reduces the speed through the guide structure and is discharged smoothly, which is conducive to avoiding the formation of vortex, improving the oil smoke absorption effect, and reducing noise.

[0015] Preferably, the distance between the lower edge of the smoke guide structure and the lower edge of the first guide plate is L3, 5mm≤L3≤88mm. Such a structure is helpful to improve the oil smoke gathering effect.

[0016] In the above schemes, the lower part of the shell has a front plate and a rear plate arranged in a front-to-back spacing, the smoke inlet cavity is located between the front plate and the rear plate, the smoke guide structure is located on the front plate, and the front plate forms a concave receiving groove for installing the power supply component at the front side wall corresponding to the smoke guide structure. The front plate of the present invention is made of stainless steel, and the receiving groove is formed by punching a part of the front plate from front to back. Of course, if plastic, aluminum or other materials are used, the corresponding structure can also be obtained by injection molding, deep drawing, etc.

[0017] Compared with the prior art, the advantages of the present invention are: the guide structure arranged at the upper edge of the smoke inlet of the present invention can form an airflow buffer zone together with the smoke baffle, thereby slowing down the rapidly rising oil smoke, so that the oil smoke will be sucked away and quickly discharged after a short detour after entering the smoke inlet cavity through the smoke inlet, thereby improving the oil smoke suction effect and reducing the aerodynamic noise at the smoke inlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0019] Figure 2 Schematic diagram of the smoke inlet cavity, the flow guide structure, and the smoke guide structure in an embodiment of the present invention;

[0020] Figure 3 It is a schematic diagram of the airflow state when the air guide structure in the embodiment of the present invention only includes the first guide plate;

[0021] Figure 4 It is a schematic diagram of the airflow state when the air guide structure includes a first guide plate and a second guide plate in an embodiment of the present invention;

[0022] Figure 5 It is a schematic diagram of the airflow state when the air guide structure and the smoke guide structure cooperate in the embodiment of the invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings.

[0024] like Figures 1 to 5 As shown, the range hood of this embodiment includes a shell body 1 and a fan system 2 arranged in the shell body 1. The lower portion of the shell body 1 is provided with a vertically extending smoke inlet chamber 11. A smoke inlet port 111 connected to the smoke inlet chamber 11 is formed on the front side wall of the lower portion of the shell body 1. A smoke baffle 3 arranged near the upper edge of the smoke inlet port 111 is provided on the front side of the shell body 1. The smoke baffle 3 can be fixed horizontally or can be flipped.

[0025] In this embodiment, the upper edge of the smoke inlet 111 is provided with a guide structure 4 capable of reducing the flow rate of the inlet oil smoke, and the guide structure 4 comprises a first guide plate 41, the upper edge of which is connected to the upper edge of the smoke inlet 111, and the first guide plate 41 is arranged to be gradually tilted backward from top to bottom. The first guide plate 41 can form an airflow buffer zone together with the smoke baffle 3 to reduce the speed of the rapidly rising oil smoke, so that the oil smoke will be sucked away and quickly discharged after a short bypass after passing through the smoke inlet 111 and entering the smoke inlet chamber 11, thereby improving the oil smoke suction effect and reducing the aerodynamic noise at the smoke inlet 111.

[0026] In this embodiment, a smoke guide structure 5 protruding backward is provided on the inner front wall of the smoke inlet chamber 11, and the smoke guide structure 5 is located above the guide structure 4. The lower part of the housing 1 of this embodiment has a front plate 12 and a rear plate 13 arranged in a front-to-back spacing, the smoke inlet chamber 11 is located between the front plate 12 and the rear plate 13, the smoke guide structure 5 is located on the front plate 12, and the front plate 12 forms a concave receiving groove 50 for installing the power supply component at the front side wall corresponding to the smoke guide structure 5. The front plate 12 of this embodiment is made of stainless steel, and the smoke guide structure 5 and the receiving groove 50 are formed by stamping the part of the front plate 12 from front to back. Of course, those skilled in the art should understand that if plastic, aluminum or other materials are used, the corresponding structure can also be obtained by injection molding, deep drawing, etc. Since the smoke inlet 111 of the present embodiment is perpendicular to the smoke inlet chamber 11, when the smoke gathers downward under the action of the smoke baffle 3 and enters the smoke inlet chamber 11, it is easy to cause local impact and accumulation of the smoke due to the sudden change in flow direction. After the above-mentioned smoke guiding structure 5 is provided, the smoke entering the smoke inlet chamber 11 can flow along the rear wall of the smoke guiding structure 5 to reduce the local impact and accumulation of the smoke at the inner edge of the smoke inlet 111 due to the sudden change in flow direction, which is beneficial to improving the smoke absorption effect.

[0027] In the present embodiment, the smoke guiding structure 5 has a plane 51 arranged vertically and an inclined surface 52 extending gradually outwardly from the edge of the plane 51. The inclined surface 52 can further reduce the collision between the oil smoke and the smoke guiding structure 5, which is conducive to a smoother flow of the oil smoke. The width of the smoke guiding structure 5 in the front-to-back direction is L1, the projection width of the inclined surface 52 on the vertical plane is L2, and the acute angle between the inclined surface 52 and the vertical plane is b, b = arctan (L1 / L2) ~ 60°, and in the present embodiment, 30°≤b≤60°. The use of such parameter settings is conducive to significantly reducing the local collision and accumulation of oil smoke at the inner edge of the smoke inlet due to the sudden change in flow direction, thereby improving the oil smoke absorption effect. When b = 45°, the effect is particularly significant.

[0028] The lower edge of the first guide plate 41 of this embodiment is connected with a second guide plate 42 which gradually tilts upward from front to back. Although the smoke guide structure 5 provided in this embodiment is conducive to improving the flow effect of the oil smoke in the smoke inlet chamber 11, Figure 3 As shown, a detour area 110 is formed between the lower end of the smoke guide structure 5 and the smoke inlet 111. When the rising oil smoke enters the smoke inlet chamber 11 from the smoke inlet 111, a vortex is formed in the detour area 110 when the fluid turns rapidly, causing gas reflux, energy loss and aerodynamic noise. At the same time, the disturbed airflow continues to move upward and touches the smoke guide structure 5. If the inclination, front and rear width, etc. of the smoke guide structure 5 are not reasonably set, it will cause disturbance of the airflow again, which will have a negative impact on the oil smoke absorption effect. In order to solve the above problems, the second guide plate 42 is provided in this embodiment, such as Figure 4 As shown, the second guide plate 42 can guide the direction of the oil smoke after the first guide plate 41 changes direction again, so that a large amount of oil smoke avoids the detour area 110, avoids the formation of vortex in the detour area 100, and reduces the direct impact strength between the oil smoke and the smoke guide structure 5, so as to reduce the energy loss and aerodynamic noise of the oil smoke in the smoke inlet chamber 11. In addition, a V-shaped oil guide groove 40 is formed between the second guide plate 42 and the first guide plate 41, so that the oil flowing down from the front wall of the smoke inlet chamber 11 can flow through the two ends of the V-shaped guide groove 40 to the oil cup 6 below it, so as to avoid oil droplets directly dripping downward from the front wall of the smoke inlet chamber 11 through the smoke inlet port 111, affecting the visual experience of consumers, and reducing the cleaning difficulty for consumers.

[0029] Specifically, when the intersection line between the inclined surface 52 and the plane where the second guide plate 42 is located is located in front of the plane 51, the obtuse angle between the inclined surface 52 and the second guide plate 42 is d, and 110°≤d≤180°. Figure 5 As shown, maintaining the angle within this range can make the oil smoke follow the trajectory after the second guide plate 42 flows, so that it contacts the inner rear wall of the smoke guide structure 5 in a more gentle manner, so that the oil smoke maintains a relatively gentle movement trajectory as a whole after being sucked into the smoke inlet chamber 11 from the smoke inlet port 111, avoiding obvious changes in the airflow direction, which is conducive to the smooth flow of airflow. When the intersection line of the extension surface of the second guide plate 42 and the lower inclined surface 52 of the smoke guide structure 5 is located at the rear side of the plane 51, most of the oil smoke will not directly collide with the smoke guide structure 5 after passing through the second guide plate 52. The smoke guide structure 5 shortens the cross-sectional size of the front and rear flow channels of the smoke inlet chamber 11, so that the velocity of the passing airflow is accelerated, further improving the oil smoke extraction effect of the range hood.

[0030] In this embodiment, the angle between the second guide plate 42 and the front side wall of the smoke inlet chamber 11 is α, 15°≤α≤70°, and the optimal range is 20°≤α≤30°. The distance between the junction of the first guide plate 41 and the second guide plate 42 and the rear wall of the smoke inlet chamber 11 is s, and the vertical height of the second guide plate 42 is h, 2mm≤h×sinα≤s / 3, 90mm≤s≤110mm in this embodiment. Such a design is conducive to avoiding the formation of vortexes, improving the oil fume absorption effect, and reducing noise. When α=25° and s=100mm, the effect is particularly significant. When the smoke baffle 3 is arranged horizontally, the height between the junction of the first guide plate 41 and the second guide plate 42 and the lower wall of the smoke baffle 3 is H, 10mm≤H≤40mm. The angle between the first guide plate 41 and the horizontal plane is c, 30°≤c≤60°. The distance between the lower edge of the smoke guide structure 5 and the lower edge of the first guide plate 41 is L3, 5mm≤L3≤88mm. With this structure, the smoke baffle 3 gathers the smoke and enters the smoke inlet 111, and is further decelerated by the guide structure 5 and discharged smoothly, which is conducive to avoiding the formation of vortex, improving the smoke absorption effect, and reducing noise. When H=15mm, c=45°, and L3=42mm, the effect is particularly significant.

Claims

1. A range hood, comprising a housing (1) and a fan system (2) arranged in the housing (1), characterized in that: The lower part of the shell (1) has a vertically extending smoke inlet chamber (11), the front side wall of the lower part of the shell (1) is provided with a smoke inlet port (111) connected to the smoke inlet chamber (11), the front side of the shell (1) is provided with a smoke baffle (3) arranged near the upper edge of the smoke inlet port (111), the upper edge of the smoke inlet port (111) is provided with a guide structure (4) capable of reducing the flow rate of inlet oil smoke, the guide structure (4) having at least a first guide plate (41) which is gradually inclined backward from top to bottom; A smoke guiding structure (5) protruding backwards is provided on the inner front wall of the smoke inlet chamber (11), and the smoke guiding structure (5) is located above the flow guiding structure (4); The smoke guiding structure (5) comprises a plane (51) arranged vertically and an inclined surface (52) extending gradually outwardly from the edge of the plane (51); The lower edge of the first guide plate (41) is connected to a second guide plate (42) which is gradually inclined upward from front to back; when the intersection line between the inclined surface (52) and the plane where the second guide plate (42) is located is located in front of the plane (51), the obtuse angle formed by the inclined surface (52) and the second guide plate (42) is d, and 110°≤d≤180°; the angle between the second guide plate (42) and the front side wall of the smoke inlet chamber (11) is α, and 15°≤α≤70°.

2. The range hood according to claim 1, characterized in that: The width of the smoke guiding structure (5) in the front-to-back direction is L1, the projection width of the inclined surface (52) on the vertical plane is L2, and the acute angle formed between the inclined surface (52) and the vertical plane is b, where b=arctan(L1 / L2)~60°.

3. The range hood according to claim 2, characterized in that: 30°≤b≤60°。 4. The range hood according to claim 1, characterized in that: 20°≤α≤30°。 5. The range hood according to claim 1, characterized in that: The distance between the junction of the first guide plate (41) and the second guide plate (42) and the inner rear wall of the smoke inlet chamber (11) is s, and the vertical height of the second guide plate (42) is h, 2mm≤h×sinα≤s / 3.

6. The range hood according to claim 5, characterized in that: 90mm≤s≤110mm.

7. The range hood according to claim 1, characterized in that: When the smoke baffle (3) is arranged horizontally, the height between the junction of the first guide plate (41) and the second guide plate (42) and the lower wall surface of the smoke baffle (3) is H, and 10≤H≤40mm.

8. The range hood according to any one of claims 1 to 7, characterized in that: The included angle between the first guide plate (41) and the horizontal plane is c, 30°≤c≤60°.

9. The range hood according to any one of claims 1 to 7, characterized in that: The distance between the lower edge of the smoke guiding structure (5) and the lower edge of the first guide plate (41) is L3, 5mm≤L3≤88mm.

10. The range hood according to any one of claims 1 to 7, characterized in that: The lower part of the shell (1) comprises a front plate (12) and a rear plate (13) which are arranged in a front-to-back manner, the smoke inlet chamber (11) is located between the front plate (12) and the rear plate (13), the smoke guide structure (5) is located on the front plate (12), and the front plate (12) forms a concave receiving groove (50) for installing a power supply component at a front side wall corresponding to the smoke guide structure (5).

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