Smoke collecting assembly and range hood

Abstract

The utility model relates to the technical field of kitchen appliances, and discloses a smoke collecting assembly and a range hood. The smoke collecting assembly comprises a smoke collecting hood, a smoke gathering hood and a separator, and a smoke inlet is formed in the smoke collecting hood; the smoke gathering hood is arranged on the smoke collecting hood and located above the smoke inlet, and a drainage opening is formed in the smoke gathering hood; the separator is arranged in the exhaust fume collecting hood, the separator divides the internal space of the exhaust fume collecting hood into a first flow channel and a second flow channel, the first flow channel is communicated with the exhaust fume inlet, and the second flow channel is communicated with the drainage port. According to the utility model, the oil smoke suction efficiency is improved by adopting a main suction and secondary guide oil smoke suction mode, the oil smoke suction effect is enhanced, the flow of the first flow channel and the second flow channel can be effectively distributed, the rotating speed requirement of the fan is reduced, the proportion of invalid negative pressure air suction is reduced, the electric energy consumption is reduced, and the energy-saving and environment-friendly effects are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to a smoke collecting component and a range hood. Background Art

[0002] The range hood is a household appliance that purifies the kitchen environment. It is installed above the kitchen stove and can quickly remove the waste from stove combustion and the oil smoke generated during cooking that is harmful to the human body and discharge it outdoors. At the same time, it condenses and collects the oil smoke, reduces pollution, purifies the air, and has a safety guarantee function of anti-toxicity and explosion-proof.

[0003] With the development of range hoods, they have taken on various forms, such as side suction range hoods and ultra-thin range hoods. In order to improve the smoke extraction effect, these range hoods generally have smoke collecting flaps at the smoke collecting chamber of the range hood. The smoke collecting flaps tilt outward and open to guide the smoke and prevent it from drifting away. However, when some smoke drifts upward, it will leave the negative pressure area at the smoke inlet and escape upward or to the surroundings, resulting in poor smoke collection and smoke extraction effects, and unable to solve the problem of smoke pollution, resulting in poor user experience. Utility Model Content

[0004] Based on the above problems, the purpose of the utility model is to provide a smoke collection component and a range hood, which can reduce the escape and diffusion range of oil smoke, enhance the oil smoke absorption effect, and improve the user experience.

[0005] In order to achieve the above objectives, the following technical solutions are provided:

[0006] In a first aspect, the utility model provides a smoke collecting assembly, comprising:

[0007] A smoke collecting hood, wherein a smoke inlet is arranged on the smoke collecting hood;

[0008] The smoke collecting hood is arranged on the smoke collecting hood and is located above the smoke inlet. The smoke collecting hood is provided with a drainage port;

[0009] The partition is arranged in the smoke collecting hood, and divides the internal space of the smoke collecting hood into a first flow channel and a second flow channel. The first flow channel is connected to the smoke inlet, and the second flow channel is connected to the drainage port.

[0010] As an optional scheme of the smoke collecting assembly provided by the utility model, the flow ratio of the second flow channel to the first flow channel is a, and the value range of a is 1 / 3≤a≤3 / 5; and / or, the width of the drainage port is B, and the value range of B is 15mm≤B≤30mm; and / or, the distance between the drainage port and the front side of the smoke hood is b, and the value range of b is 0≤b≤30mm.

[0011] As an optional solution of the smoke collecting assembly provided by the utility model, the smoke collecting assembly also includes an adjusting assembly, and the partition is movably arranged in the smoke collecting hood. The adjusting assembly is used to adjust the position of the partition in the smoke collecting hood to adjust the flow ratio of the first flow channel and the second flow channel.

[0012] As an optional solution of the smoke collection assembly provided by the utility model, the adjustment assembly includes a first driving member, a limiting cylinder, a screw rod and a nut. The first driving member is used to drive the screw rod to rotate. The screw rod is rotatably arranged in the limiting cylinder. The nut is threadedly connected to the screw rod and is slidably connected to the limiting cylinder. The partition is connected to the nut.

[0013] As an optional solution of the smoke collecting assembly provided by the utility model, the partition is connected to the bottom plate of the smoke collecting hood via a flexible structure; or, the partition is connected to the bottom plate of the smoke collecting hood via a gear rack structure.

[0014] As an optional solution of the smoke collecting assembly provided by the utility model, the smoke collecting hood is movably arranged on the smoke collecting hood, and the smoke collecting hood can be hidden in the smoke inlet.

[0015] As an optional solution of the smoke collecting assembly provided by the utility model, the smoke collecting assembly further includes a driving assembly, and the driving assembly is used to drive the smoke collecting hood to be hidden in the smoke inlet or to extend out of the smoke inlet.

[0016] As an optional solution of the smoke collecting assembly provided by the utility model, the driving assembly includes a second driving member and a support plate, the support plate is rotatably connected to the partition, the second driving member is used to drive the support plate to rotate, the support plate can support the smoke collecting hood so that the smoke collecting hood extends out of the smoke inlet, and the support plate can avoid the smoke collecting hood so that the smoke collecting hood is hidden in the smoke inlet.

[0017] As an optional solution of the smoke collecting assembly provided by the utility model, the bottom plate of the smoke collecting hood is provided with an inclined surface; and / or the bottom plate of the smoke collecting hood is provided with an oil blocking protrusion.

[0018] In a second aspect, the utility model further provides a range hood, comprising a range hood housing, an air duct assembly and the above-mentioned smoke collecting assembly, wherein the air duct assembly is arranged in the range hood housing, and the smoke collecting assembly is arranged at the bottom of the range hood housing.

[0019] The beneficial effects of the utility model are:

[0020] The smoke collecting component and range hood provided by the utility model, under the action of the fan, the smoke inlet of the smoke collecting hood and the drainage port of the smoke collecting hood both form negative pressure. Since the partition divides the internal space of the smoke collecting hood into a first flow channel and a second flow channel, the oil smoke enters the first flow channel through the smoke inlet, and the oil smoke escaping around the smoke inlet enters the second flow channel through the drainage port, which reduces the escape and diffusion range of the oil smoke, ensures a good kitchen environment, and improves the user experience. The "primary suction and secondary suction" oil smoke suction method is adopted to improve the oil smoke suction efficiency and enhance the oil smoke suction effect. The flow rates of the first flow channel and the second flow channel can be effectively allocated, the speed requirement of the fan is reduced, the proportion of invalid negative pressure absorbed air is reduced, the power consumption is reduced, and energy saving and environmental protection are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0022] Figure 1 It is a structural schematic diagram of a range hood including a smoke collection component provided by a specific embodiment of the utility model;

[0023] Figure 2 It is a cross-sectional schematic diagram of a range hood including a smoke collection assembly provided by a specific embodiment of the utility model;

[0024] Figure 3 It is a structural schematic diagram of a smoke collecting hood, a partition, an adjustment component and a flexible structure provided by a specific embodiment of the utility model;

[0025] Figure 4 It is a partial structural schematic diagram of a separator and an adjustment assembly provided in a specific embodiment of the utility model;

[0026] Figure 5 It is a structural schematic diagram of a smoke collecting assembly provided by a specific embodiment of the utility model, wherein the partition is connected to the bottom plate of the smoke collecting hood through a gear rack structure;

[0027] Figure 6 It is a structural schematic diagram of a smoke collecting assembly provided by a specific embodiment of the utility model, wherein the smoke collecting hood extends out of the smoke inlet;

[0028] Figure 7 It is a structural schematic diagram of a smoke collecting assembly provided by a specific embodiment of the utility model, wherein the smoke collecting hood is hidden in the smoke inlet.

[0029] In the figure:

[0030] 1. Smoke hood; 2. Smoke hood; 3. Partition; 4. Adjustment component; 5. Flexible structure; 6. Gear rack structure; 7. Drive component;

[0031] 11. Smoke inlet; 12. First flow channel; 13. Second flow channel;

[0032] 21. drainage port; 22. inclined surface; 23. oil retaining protrusion;

[0033] 41. Limiting cylinder; 42. Screw rod; 43. Nut; 44. Mounting seat;

[0034] 71. Support plate; 72. Hinge;

[0035] 100. Range hood housing; 200. Air duct assembly. DETAILED DESCRIPTION

[0036] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0037] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] like Figures 1 to 7As shown, the present embodiment provides a smoke collecting assembly, which includes a smoke collecting hood 1, a smoke gathering hood 2 and a partition 3. The smoke collecting hood 1 is provided with a smoke inlet 11; the smoke gathering hood 2 is provided on the smoke collecting hood 1 and is located above the smoke inlet 11, and the smoke gathering hood 2 is provided with a drainage port 21; the partition 3 is provided in the smoke collecting hood 1, and the partition 3 divides the internal space of the smoke collecting hood 1 into a first flow channel 12 and a second flow channel 13, the first flow channel 12 is connected to the smoke inlet 11, and the second flow channel 13 is connected to the drainage port 21.

[0040] Under the action of the fan, negative pressure is formed at the smoke inlet 11 of the smoke hood 1 and the outlet 21 of the smoke hood 2. Since the partition 3 divides the internal space of the smoke hood 1 into the first flow channel 12 and the second flow channel 13, the oil smoke enters the first flow channel 12 through the smoke inlet 11, and the oil smoke escaping around the smoke inlet 11 enters the second flow channel 13 through the outlet 21, which reduces the escape and diffusion range of the oil smoke, ensures a good kitchen environment, and improves the user experience. The "main suction and secondary suction" oil smoke suction method is adopted to improve the oil smoke suction efficiency and enhance the oil smoke suction effect. The flow of the first flow channel 12 and the second flow channel 13 can be effectively distributed, the speed requirement of the fan is reduced, the proportion of invalid negative pressure absorbed air is reduced, the power consumption is reduced, and energy saving and environmental protection are achieved.

[0041] In order to improve the oil fume absorption effect of the first flow channel 12 and the second flow channel 13, optionally, the flow ratio of the second flow channel 13 to the first flow channel 12 is a, and the value range of a is 1 / 3≤a≤3 / 5; and / or, the width of the drainage port 21 is B, and the value range of B is 15mm≤B≤30mm; and / or, the distance between the drainage port 21 and the front side of the smoke hood 2 is b, and the value range of b is 0≤b≤30mm. According to the principles of fluid mechanics, aerodynamics and the response surface analysis method, a is preferably 3 / 5, B is preferably 20mm, and b is preferably 20mm, at this time, the oil fume absorption effect is better. The flow channel is divided by response surface calculation to form the optimal primary and secondary flow channels, the first flow channel 12 is the main flow channel, and the second flow channel 13 is the secondary flow channel. The second flow channel 13 diverts a part of the airflow, thereby generating a drainage area near the drainage port 21. When the oil fume escapes near the drainage port 21, it will be affected by the drainage area. According to the Bernoulli equation, the mechanical energy of the fluid is conserved. The sum of the kinetic energy, potential energy and pressure potential energy of the fluid is a constant. The flow velocity in the drainage area is large and the pressure is small. The external atmospheric pressure squeezes the escaping oil smoke upward, so that the oil smoke escaping outward is drained by the drainage area to change the rising path of the oil smoke, and then enters the smoke inlet 11. The flow distribution of the primary and secondary flow channels meets the "primary induction and secondary suction", and will not cause the secondary flow channel to be too large to cause invalid negative pressure, affecting the smoking of the main channel, and also avoid the secondary flow channel The flow is too small to achieve the drainage effect. The dual-channel system obtained by response surface optimization can solve the problem that the airflow enters the flow channel from the smoke inlet 11 and the drainage port 21 and collides with each other to form a vortex, thereby blocking the flow channel, increasing aerodynamic noise, and reducing air volume. The optimal dual-channel system is optimized using the response surface algorithm. This system is the flow channel with the lowest flow resistance, which can ensure smooth airflow.

[0042] In order to facilitate the reasonable distribution of the flow ratio of the first flow channel 12 and the second flow channel 13 and reduce the turbulence of the oil fume gas, optionally, the smoke collecting component also includes an adjusting component 4, and the partition 3 is movably arranged in the smoke collecting hood 1. The adjusting component 4 is used to adjust the position of the partition 3 in the smoke collecting hood 1 to adjust the flow ratio of the first flow channel 12 and the second flow channel 13. The partition 3 can be movably arranged in the smoke collecting hood 1, and can also be rotatably arranged in the smoke collecting hood 1, which is not limited here. The position includes the position and the attitude angle. The position of the partition 3 in the smoke collecting hood 1 can specifically be the spacing and inclination angle of the partition 3 relative to the rear plate of the smoke collecting hood 1. The adjusting component 4 can adjust the spacing of the partition 3 relative to the rear plate of the smoke collecting hood 1, and can also adjust the inclination angle of the partition 3 relative to the rear plate of the smoke collecting hood 1, so as to change the flow ratio of the first flow channel 12 and the second flow channel 13. In the stewing and boiling cooking modes, the air intake through the smoke inlet 11 is the main air intake mode, the flow rate of the second flow channel 13 tends to 0, and the flow rate of the first flow channel 12 is greater than the flow rate of the second flow channel 13. In the frying, deep-frying and stir-frying modes, the air intake mode is "main suction and secondary induction", and the flow rate ratio of the second flow channel 13 to the first flow channel 12 can be 1:3. The smoke leakage is detected, and the "main suction and secondary induction + secondary suction" air intake mode is formed, and the flow rate ratio of the second flow channel 13 to the first flow channel 12 can be 3:5.

[0043] Optionally, the adjustment assembly 4 includes a first driving member, a limiting cylinder 41, a screw rod 42 and a nut 43. The first driving member is used to drive the screw rod 42 to rotate. The screw rod 42 is rotatably arranged in the limiting cylinder 41. The nut 43 is threadedly connected to the screw rod 42 and is slidably connected to the limiting cylinder 41. The partition 3 is connected to the nut 43. The first driving member can be a driving element such as a motor and a cylinder, which is not limited here. The end of the screw rod 42 is installed on the inner wall of the smoke hood 1 through a mounting seat 44. The limiting cylinder 41 has a slide groove, and the nut 43 has a slider that slides with the slide groove. The nut 43 is connected to the partition 3 through the slider. The slider and the partition 3 can be detachably connected by screws for easy maintenance.

[0044] In order to make the partition 3 movable in the smoke collecting hood 1, the partition 3 is optionally connected to the bottom plate of the smoke collecting hood 2 through a flexible structure 5; or, the partition 3 is connected to the bottom plate of the smoke collecting hood 2 through a gear rack structure 6. The flexible structure 5 can be a flexible curved plate structure, for example, using a high temperature resistant elastic material. The gear rack structure 6 includes a gear and a rack, one of which is mounted on the partition 3, and the other of which is mounted on the bottom plate of the smoke collecting hood 2.

[0045] To achieve an ultra-thin appearance of the range hood, the smoke collecting hood 2 is optionally movably disposed on the smoke collecting hood 1, and the smoke collecting hood 2 can be hidden in the smoke inlet 11, thereby reducing the occupied volume of the smoke collecting hood 2 in a non-working state. The smoke collecting hood 2 can be movably disposed on the smoke collecting hood 1, or can be rotatably disposed on the smoke collecting hood 1, which is not limited here.

[0046] To achieve automatic hiding or automatic exposure of the smoke collecting hood 2, the smoke collecting assembly may further include a driving assembly 7, which is used to drive the smoke collecting hood 2 to be hidden in the smoke inlet 11 or to extend out of the smoke inlet 11. The driving assembly 7 may be a driving member that directly drives the smoke collecting hood 2, or may indirectly drive the smoke collecting hood 2 through other transmission components, which is not limited here.

[0047] Optionally, the drive assembly 7 includes a second drive member and a support plate 71, the support plate 71 is rotatably connected to the partition 3, the second drive member is used to drive the support plate 71 to rotate, the support plate 71 can support the smoke hood 2 so that the smoke hood 2 extends out of the smoke inlet 11, and the support plate 71 can avoid the smoke hood 2 so that the smoke hood 2 is hidden in the smoke inlet 11. The second drive member can be a drive element such as a motor and a cylinder, which is not limited here. The support plate 71 is in the shape of an angle plate and is formed by two plates connected vertically. The support plate 71 can be rotatably connected to the partition 3 through a hinge 72, and the hinge 72 can be arranged with two intervals to improve the stability of the relative rotation between the support plate 71 and the partition 3. When the smoke hood 2 extends out of the smoke inlet 11, the bottom plate of the smoke hood 2 can be placed on the support plate 71, and the second drive member can drive the support plate 71 to rotate, so that the support plate 71 avoids the smoke hood 2, so that the smoke hood 2 is hidden in the smoke inlet 11, and an ultra-thin appearance is achieved.

[0048] In order to prevent oil droplets from dripping onto the kitchen stove countertop, optionally, the bottom plate of the smoke hood 2 is provided with an inclined surface 22; and / or, the bottom plate of the smoke hood 2 is provided with an oil-blocking protrusion 23. The portion of the inclined surface 22 close to the drainage port 21 is higher than the portion away from the drainage port 21, that is, the inclined surface 22 is arranged to be inclined downward from the drainage port 21 to the inside of the smoke hood 1. The inclination angle of the inclined surface 22 can be between 0 and 3 degrees. The oil droplets on the inclined surface 22 flow back under the action of gravity to avoid dripping onto the kitchen stove countertop through the drainage port 21. When a large number of oil droplets accumulate, the oil-blocking protrusion 23 can effectively prevent the oil droplets from dripping onto the kitchen stove countertop through the drainage port 21. The oil-blocking protrusion 23 is arranged on the side of the bottom plate of the smoke hood 2 close to the drainage port 21.

[0049] This embodiment further provides a range hood, comprising a range hood housing 100 , an air duct assembly 200 and the above-mentioned smoke collecting assembly, wherein the air duct assembly 200 is disposed in the range hood housing 100 , and the smoke collecting assembly is disposed at the bottom of the range hood housing 100 . Under the action of the fan of the air duct assembly 200, negative pressure is formed at the smoke inlet 11 of the smoke hood 1 and the outlet 21 of the smoke hood 2. Since the partition 3 divides the internal space of the smoke hood 1 into a first flow channel 12 and a second flow channel 13, the oil smoke enters the first flow channel 12 through the smoke inlet 11, and the oil smoke escaping around the smoke inlet 11 enters the second flow channel 13 through the outlet 21, thereby reducing the escape and diffusion range of the oil smoke, ensuring a good kitchen environment, and improving the user experience. The "main suction and secondary suction" oil smoke suction method is adopted to improve the oil smoke suction efficiency and enhance the oil smoke suction effect. The flow of the first flow channel 12 and the second flow channel 13 can be effectively distributed, the speed requirement of the fan is reduced, the proportion of invalid negative pressure absorbed air is reduced, the power consumption is reduced, and energy saving and environmental protection are achieved.

[0050] In the past, traditional range hoods simply relied on increasing the motor speed of the fan to improve the smoking effect, which often absorbed a large amount of air, resulting in overperformance. At the same time, high speed means high noise, and even long-term operation at high speed will affect the service life of the range hood and affect the user experience. The range hood provided in this embodiment can adjust the flow ratio of the primary and secondary flow channels according to the cooking mode and the smoking effect, effectively distribute the flow, reduce the speed requirement of the fan, reduce the proportion of invalid negative pressure air absorption in response to the smoke leakage phenomenon, and save energy.

[0051] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A smoke collecting assembly, characterized in that: include: A smoke collecting hood (1), wherein the smoke collecting hood (1) is provided with a smoke inlet (11); A smoke collecting hood (2) is arranged on the smoke collecting hood (1) and is located above the smoke inlet (11); the smoke collecting hood (2) is provided with a drainage port (21); A partition (3) is arranged in the smoke collecting hood (1), and the partition (3) divides the internal space of the smoke collecting hood (1) into a first flow channel (12) and a second flow channel (13), wherein the first flow channel (12) is connected to the smoke inlet (11), and the second flow channel (13) is connected to the drainage port (21).

2. The smoke collecting assembly according to claim 1, characterized in that: The flow ratio of the second flow channel (13) to the first flow channel (12) is a, and the value range of a is 1 / 3≤a≤3 / 5; and / or the width of the drainage port (21) is B, and the value range of B is 15mm≤B≤30mm; and / or the distance between the drainage port (21) and the front side of the smoke hood (2) is b, and the value range of b is 0≤b≤30mm.

3. The smoke collecting assembly according to claim 1, characterized in that: The smoke collecting assembly further comprises an adjusting assembly (4); the partition (3) is movably arranged in the smoke collecting hood (1); the adjusting assembly (4) is used to adjust the position of the partition (3) in the smoke collecting hood (1) so as to adjust the flow ratio between the first flow channel (12) and the second flow channel (13).

4. The smoke collecting assembly according to claim 3, characterized in that: The adjustment assembly (4) comprises a first driving member, a limiting cylinder (41), a screw rod (42) and a nut (43); the first driving member is used to drive the screw rod (42) to rotate; the screw rod (42) is rotatably arranged in the limiting cylinder (41); the nut (43) is threadedly connected to the screw rod (42) and is slidably connected to the limiting cylinder (41); and the partition (3) is connected to the nut (43).

5. The smoke collecting assembly according to claim 3, characterized in that: The partition (3) is connected to the bottom plate of the smoke collecting hood (2) via a flexible structure (5); or, the partition (3) is connected to the bottom plate of the smoke collecting hood (2) via a gear rack structure (6).

6. The smoke collecting assembly according to claim 1, characterized in that: The smoke collecting hood (2) is movably arranged on the smoke collecting hood (1), and the smoke collecting hood (2) can be hidden in the smoke inlet (11).

7. The smoke collecting assembly according to claim 6, characterized in that: The smoke collecting assembly further comprises a driving assembly (7), and the driving assembly (7) is used to drive the smoke collecting hood (2) to be hidden in the smoke inlet (11) or to extend out of the smoke inlet (11).

8. The smoke collecting assembly according to claim 7, characterized in that: The driving assembly (7) comprises a second driving member and a support plate (71); the support plate (71) is rotatably connected to the partition (3); the second driving member is used to drive the support plate (71) to rotate; the support plate (71) can support the smoke collecting hood (2) so that the smoke collecting hood (2) extends out of the smoke inlet (11); and the support plate (71) can avoid the smoke collecting hood (2) so that the smoke collecting hood (2) is hidden in the smoke inlet (11).

9. The smoke collecting assembly according to claim 1, characterized in that: The bottom plate of the smoke collecting hood (2) is provided with an inclined surface (22); and / or the bottom plate of the smoke collecting hood (2) is provided with an oil blocking protrusion (23).

10. A range hood, characterized in that: It comprises a range hood housing (100), an air duct assembly (200) and a smoke collecting assembly according to any one of claims 1 to 9, wherein the air duct assembly (200) is arranged in the range hood housing (100), and the smoke collecting assembly is arranged at the bottom of the range hood housing (100).

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