A type of lift-up range hood

Abstract

A lift type range hood, comprising a box body and an air inlet body. A oil guiding component is installed inside the box body, and a fan is arranged above the oil guiding component. A lower air inlet channel is formed behind the oil guiding edge of the oil guiding component. The main body of the air inlet body can move up and down in the lower air inlet channel, and the projection of the oil guiding edge in the vertical direction always falls on the main body of the air inlet body. The shortest distance a between the orthographic projection point of the oil leakage hole of the fan on the oil guiding component and the oil guiding edge, the width b of the lower air inlet channel in the front-back direction, and the width c of the box body in the front-back direction satisfy 0.1 < a / b < 2.5 and 0.3 < (a + b) / c < 0.95. When guiding oil, the oil liquid flows directly backward from the oil guiding component. The oil guiding path is short, the oil guiding area is large, the oil path is wide, and the oil liquid quickly disperses after falling into the oil guiding component and will not accumulate on the oil guiding component. The oil liquid guided out from the oil guiding component directly flows into the inner cavity of the main body of the air inlet body after passing over the front side of the air inlet body, without having to guide oil around the two sides or the back of the air inlet body, so that the oil guiding is smoother and there will be no oil path blockage phenomenon.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, and in particular to a lift-type range hood. Background Technology

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. They operate on the principle of fluid dynamics, typically housing a fan that draws in and exhausts cooking fumes, filtering out some grease particles with a filter. After prolonged use, oil accumulates inside the range hood, affecting its smoke extraction efficiency and lifespan. Therefore, the internal oil path needs to be designed to ensure timely flow of oil into the oil cup. For example, Chinese invention patent No. 20209294463.9 (authorization announcement No. CN 111425902B) discloses a range hood whose oil guiding structure includes a first oil guiding trough assembly for collecting condensed oil from the second air inlet box and the fan, and a second oil guiding trough assembly for guiding the collected condensed oil into the oil cup. The first oil guiding trough assembly is located on the lower inner periphery of the second air inlet box. This range hood is a lift-type range hood, which can improve the smoke extraction effect by lowering the negative pressure zone through the descent of the first air inlet box. In addition, it also has an oil guiding structure to transfer the condensed oil in the fixed part of the range hood to the moving part. However, the oil guiding channel of its oil guiding structure is complex. The oil guiding channel is wrapped around the outside of the air inlet box and the path of the oil guiding channel is long, which can easily lead to oil blockage.

[0003] For example, the Chinese invention patent No. 20201000792.1 (authorization announcement No. CN111006284B) discloses a range hood, which has an oil guiding structure inside the fan cover for guiding the oil discharged from the fan cover and the fan system into the first air inlet box. The oil guiding structure includes an oil storage guide groove that can store oil, and an oil outlet is opened on the oil storage guide groove. The oil guiding structure also includes an oil outlet opening and closing mechanism. When the first air inlet box is in a descending state, the oil outlet opening and closing mechanism opens the oil outlet, thereby connecting the oil storage guide groove and the inside of the first air inlet box. When the first air inlet box is in a retracted state inside the fan cover, the oil outlet opening and closing mechanism closes the oil outlet. Although this range hood collects oil into the oil collection device of the air intake component, solving the oil path problem of the single oil collection device in the built-in lifting range hood, its oil storage guide channel adopts a U-shaped guide channel structure, and the oil guide path is relatively long and narrow. After long-term use, oil accumulation is likely to occur, resulting in the inability to guide oil smoothly. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a lift-type range hood that, in view of the above-mentioned existing technology, eliminates the need for the oil discharged by the fan system to be guided around to the left and right sides or back of the air inlet body, and has a short oil guiding path and a wide oil channel, making it less prone to oil accumulation.

[0005] The technical solution adopted by this invention to solve the above-mentioned technical problems is as follows: The lifting range hood includes a housing and an air inlet body. A fan is installed inside the housing, and the bottom of the fan has an oil leakage hole. An oil cup is installed at the bottom of the air inlet body. The air inlet body has a main body. The characteristic feature is that an oil guiding component is installed inside the housing. The fan is positioned above the oil guiding component, and a lower air inlet channel is formed below and behind the fan. The main body of the air inlet body can move up and down within the lower air inlet channel. The rear edge of the oil guiding component is an oil guiding edge. The vertical projection of the oil guiding edge falls on the main body of the air inlet body. Oil flowing down from inside the housing enters the oil cup after passing through the oil guiding component and the air inlet body. The shortest distance between the orthographic projection point of the oil leakage hole on the oil guiding component and the oil guiding edge is 'a'. The width of the lower air inlet channel in the front-to-back direction is 'b', and the width of the housing in the front-to-back direction is 'c', thus satisfying 0.1.

[0006] The oil guiding component can have various structures. Preferably, the oil guiding component has an upper oil guiding plate extending laterally, an upper air inlet channel formed above the upper oil guiding plate, and a vertically arranged lower front plate connected to the rear of the upper oil guiding plate. The lower air inlet channel is formed between the lower front plate and the back plate of the housing. After entering from the air inlet, the oil fumes pass through the lower air inlet channel and the upper air inlet channel in sequence before being drawn into the fan. Due to the narrow front-to-back width of the lower air inlet channel, the oil fume flow velocity is fast, which can drive the external flow field to achieve faster airflow. In the same amount of time, it gives the oil fumes a greater backward velocity, preventing the oil fumes from escaping. The upper air inlet channel can construct a highly efficient pressure stabilizing chamber, which allows the airflow to be buffered and stabilized within the pressure stabilizing chamber, thereby improving the oil fume extraction effect.

[0007] The lower front plate can have various mounting structures. Preferably, the upper edge of the lower front plate is connected to the rear of the upper oil guide plate, and the lower edge of the lower front plate is connected to the bottom plate of the housing.

[0008] In a further preferred embodiment, the main body of the air inlet has an upper guide plate and an air inlet back plate. The upper guide plate is located on the front side of the air inlet back plate and forms an internal cavity between the upper guide plate and the back plate. The rear edge of the upper oil guide plate extends rearward beyond the upper guide plate, and its vertical projection falls into the internal cavity of the air inlet. Thus, an oil guiding channel is formed within the internal cavity of the air inlet, and the oil guided by the upper oil guide plate enters the oil guiding channel within the internal cavity of the air inlet, ultimately flowing into the oil cup.

[0009] ​Preferably, a grille is installed on the top of the main body of the air inlet, the front edge of the grille is mounted on the upper guide plate, the rear edge of the grille is mounted on the back plate of the air inlet, and the projection of the rear edge of the upper oil guide plate in the vertical direction falls on the grille. In this way, the oil discharged by the upper oil guide plate can first flow into the grille and then be guided into the inner cavity of the air inlet through the grille.

[0010] In order to ensure that the oil flowing out of the upper oil guide plate can flow smoothly into the grid plate, the rear edge of the upper oil guide plate extends downward and backward with an oil guide fold, and the projection of the rear edge of the oil guide fold in the vertical direction falls onto the grid plate.

[0011] In order to quickly divert the oil discharged from the upper oil guide plate and avoid oil accumulation, the upper surface of the grid plate is formed with grid channels for diverting the oil. The grid channels are distributed at intervals in the left and right directions, and each grid channel extends in the front and back directions.

[0012] In order to smoothly guide the oil falling on the grating plate into the oil cup, the grating plate is arranged obliquely downward from front to back. The front side of the grating plate has an oil guiding surface. The projection of the rear edge of the upper oil guiding plate in the vertical direction falls on the oil guiding surface. Each grating channel has an oil drain at its lowest point. The projection of the oil drain in the vertical direction falls into the oil cup.

[0013] In order to allow the oil on the upper oil guide plate to flow smoothly to the rear and downward, the upper oil guide plate is arranged at an angle from front to back and downward.

[0014] To improve the oil collection effect, the upper oil guide plate includes a first oil guide part and a second oil guide part located on the left and right sides of the first oil guide part. The first oil guide part has a downwardly recessed oil collection groove, and the oil leakage hole of the fan is located above the oil collection groove.

[0015] In order to ensure that the oil falling onto the upper oil guide plate can be quickly dispersed and to prevent oil accumulation, the surface area s1 of the first oil guide part and the surface area s2 of the second oil guide part satisfy 1 <s2 / s1<6。

[0016] To reduce the overall height of the machine when it is off, the housing includes an upper housing and a lower housing. The lower housing moves up and down relative to the upper housing under the drive of the drive mechanism. The fan is located inside the upper housing, and the upper oil guide plate is located inside the lower housing. The upper oil guide plate has a concave pressing structure. When the lower housing is raised, the bottom of the fan is accommodated in the pressing structure.

[0017] To achieve two-stage lifting, the housing includes an upper housing and a lower housing. The lower housing moves up and down relative to the upper housing under the drive of the drive mechanism. The lower housing has a lower air inlet channel and an upper air inlet channel inside. The lower air inlet channel is located below and behind the upper air inlet channel. The air inlet body moves up and down relative to the lower housing under the drive of the drive mechanism.

[0018] Further optimized, the width W1 of the upper air inlet channel in the front-to-back direction and the width b1 of the lower air inlet channel in the front-to-back direction satisfy: W1 ≥ 1.5b1. With this configuration, the lower air inlet channel is narrower, resulting in a faster flow velocity. This allows the fumes to be quickly drawn into the upper air inlet channel, which forms a highly efficient pressure-stabilizing chamber. Within this chamber, the fumes are buffered and stabilized, ensuring smooth exhaust. Simultaneously, it guarantees a relatively uniform airflow velocity at the smoke inlet, preventing smoke from escaping from both sides of the range hood.

[0019] Further preferably, the upper housing also includes a fan frame, the fan being a centrifugal fan, with the impeller's central axis perpendicular to the rear plate of the fan frame. A main air intake channel for the fan is provided between the rear air inlet of the fan and the rear plate of the fan frame. The width b in the front-to-back direction of the lower air intake channel and the width W2 in the front-to-back direction of the main air intake channel satisfy: b > W2. This configuration, on the one hand, forms a direct suction and exhaust channel, which is beneficial for improving the oil fume extraction effect; on the other hand, it allows oil stains in the main air intake channel of the fan to drip directly into the lower air intake channel and then flow into the oil cup at the bottom of the air intake body, resulting in a shorter oil path and preventing dripping onto the outside of the air intake body.

[0020] Compared with the prior art, the advantages of the present invention are as follows: A lower air inlet channel is formed behind the oil guiding component of the lifting range hood; the main body of the air inlet can move up and down within the lower air inlet channel; the projection of the oil guiding edge of the oil guiding component in the vertical direction always falls on the main body of the air inlet; and the shortest distance between the orthographic projection point of the fan oil leakage hole on the oil guiding component and the oil guiding edge is 'a'; the width of the lower air inlet channel in the front-to-back direction is 'b'; and the width of the housing in the front-to-back direction is 'c'. Therefore, 0.1 Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a range hood according to an embodiment of the present invention (lower housing in raised state). Figure 2 for Figure 1 The diagram shown is a schematic of the internal structure of the range hood. Figure 3 for Figure 1 The diagram shows a cross-sectional view of the range hood. Figure 4 for Figure 1 The diagram shows a partial internal structure of the range hood. Figure 5 This is a schematic diagram of the oil guiding component of the range hood according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the grating plate according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the installation structure of the air inlet, grille, and oil cup according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of a range hood according to an embodiment of the present invention (lower housing in descending state); Figure 9 for Figure 8 The diagram shown is a schematic of the internal structure of the range hood. Figure 10 for Figure 8 ​The diagram shows a cross-sectional view of the range hood. Figure 11 for Figure 8 The diagram shows another internal structure of the range hood. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] like Figures 1 to 4 As shown, the lift-type range hood of this embodiment includes an upper housing 1, a lower housing 2, and an air inlet 3. A fan 4 is installed inside the upper housing 1, and the fan has an oil drain hole 41 at its bottom. The lower housing 2 is mounted on the upper housing 1 and can move up and down relative to the upper housing 1; furthermore, the lower housing 2 encloses the upper housing 1. Figure 3 The direction indicated by the middle arrow A is rearward. The air inlet 3 is housed in the rear of the lower housing 2 and can move up and down relative to the lower housing 2. An oil cup 5 is installed at the bottom of the air inlet 3. The lower housing 2 and the air inlet 3 can move synchronously under the drive of a single drive mechanism, or they can move independently under the drive of an independent drive mechanism.

[0024] like Figures 8 to 11 As shown, an oil guiding component is installed inside the lower housing 1. In this embodiment, the oil guiding component has an upper oil guiding plate 6 extending horizontally. The rear of the upper oil guiding plate 6 is connected to a vertically arranged lower front plate 7. The upper edge of the lower front plate 7 is connected to the rear of the upper oil guiding plate 6, and the lower edge of the lower front plate 7 is connected to the bottom plate 22 of the housing. Thus, a lower air inlet channel 92 and an upper air inlet channel 91 are formed inside the lower housing 2. The upper air inlet channel 91 is located above the oil guiding plate 6, and the lower air inlet channel 92 is located between the lower front plate 7 and the back plate 21 of the housing. The lower air inlet channel 92 is located below and behind the upper air inlet channel 91. The width W1 of the upper air inlet channel 91 in the front-rear direction and the width b1 of the lower air inlet channel 92 in the front-rear direction satisfy: W1 ≥ 1.5b1. This design, with its narrower lower air intake channel 92, allows for faster airflow from the external flow field, providing greater backward velocity to the fumes within the same timeframe and preventing them from escaping. When the range hood is operating, the fumes are quickly drawn into the upper air intake channel 91, which forms a highly efficient pressure-stabilizing chamber. Within this chamber, the fumes are buffered and stabilized for smooth exhaust, while maintaining a relatively uniform airflow velocity at the inlet, preventing fumes from escaping from the sides of the range hood. Furthermore, the wider upper air intake channel 91 effectively reduces airflow velocity, minimizing its impact on the trajectory of oil droplets and preventing splashing of oil droplets dripping from the volute.

[0025] In addition, the variable cross-section air inlet channel can effectively block the direct transmission of the noise of the fan 4 to the outside. By simulating the principle of resistance sound absorption, the sound waves emitted from the fan 4 are reflected multiple times inside the wide upper air inlet channel 91 and thus canceled out. Therefore, a variable cross-section acoustic impedance is constructed to weaken the energy of the sound transmitted from the fan air inlet to the range hood air inlet. Additionally, a simulated static pressure box with an air flow buffer chamber is constructed to improve the unsteady flow separation caused by the inlet distortion, thereby reducing the pressure pulsation and improving the sound quality.

[0026] The upper box body 1 includes a fan frame 11. The fan in this embodiment is a centrifugal fan. The fan 4 is vertically arranged and the central axis of the impeller is perpendicular to the rear plate 12 of the fan frame. There is a main air inlet channel 93 of the fan between the rear air inlet 42 of the fan 4 and the rear plate 12 of the fan frame. The width b of the lower air inlet channel 92 in the front-back direction and the width W2 of the main air inlet channel 93 of the fan in the front-back direction satisfy: b > W2. With this setting, on the one hand, a direct suction and direct discharge channel is formed by the lower air inlet channel 92 and the main air inlet channel 93 of the fan, which is beneficial to improving the oil fume suction effect. On the other hand, the oil stain in the main air inlet channel 93 of the fan can directly drip into the lower air inlet channel 92 and then flow into the oil cup 5 at the bottom of the air inlet body 3. The oil path is short and will not drip outside the air inlet body 3.

[0027] Combined Figure 3 and Figure 5 As shown, the upper oil guide plate 6 of this embodiment is arranged obliquely downward from front to back as a whole. The rear edge of the upper oil guide plate 6 extends backward and downward with an oil guide fold 61, and the rear edge of the oil guide fold 61 constitutes the oil guide edge. The upper oil guide plate 6 includes a first oil guide part 62 and second oil guide parts 63 arranged on the left and right sides of the first oil guide part 62. The surface area s1 of the first oil guide part 62 and the surface area s2 of the second oil guide parts 63 satisfy 1 < s2 / s1 < 6. The first oil guide part 62 has an oil collecting groove that is concave downward. The oil leakage hole 41 of the fan 4 is arranged above the oil collecting groove. After setting the oil collecting groove, the oil collecting effect can be improved. At the same time, the oil collecting groove is a concave pressing structure. The fan 4 is located above the upper oil guide plate 6. In the state where the lower box body 2 is raised to the highest position, the upper oil guide plate 6 rises to the highest position along with the lower box body 2, and the bottom of the fan 4 is accommodated in the pressing structure of the upper oil guide plate 6. The oil collecting groove can, on the one hand, avoid interference with the fan 4 after the whole machine is folded up, reduce the height of the whole machine, improve the installation adaptability, convenience and save the manufacturing cost; on the other hand, the concave oil collecting groove is equivalent to an oil collecting cavity, which orderly guides the oil liquid of the fan 4 downward, avoiding the disorderly discharge of the main oil liquid inside the range hood, and improving the cleanliness and oil discharge efficiency inside the whole machine.

[0028] As Figure 10As shown, the lower air inlet channel 92 is located below and behind the oil guide edge of the upper oil guide plate 6. The main body 31 of the air inlet body moves up and down within the lower air inlet channel 92, so that the projection of the oil guide edge in the vertical direction always falls on the main body 31 of the air inlet body. The shortest distance between the orthographic projection point of the oil leakage hole 41 of the blower 4 on the upper oil guide plate 6 and the oil guide edge is 'a', the width of the lower air inlet channel 92 in the front-to-back direction is 'b', and the width of the lower housing 2 in the front-to-back direction is 'c', thus satisfying 0.1.

[0029] like Figure 7 As shown, the main body 31 of the air inlet in this embodiment has an upper guide plate 311 and an air inlet back plate 312. The upper guide plate 311 is disposed on the front side of the air inlet back plate 312 and forms an air inlet inner cavity 313 with the air inlet back plate 312. A grille plate 8 is installed on the top of the main body 31 of the air inlet. The front side of the grille plate 8 is installed on the upper guide plate 311, and the rear side of the grille plate 8 is installed on the air inlet back plate 312. The grille plate 8 is fixed to the main body 31 of the air inlet and rises and falls synchronously with the air inlet 3.

[0030] like Figure 6 As shown, the upper surface of the grille plate 8 has grille channels 81 for diverting oil. The grille channels 81 are spaced apart in the left and right directions, and each grille channel 81 extends in the front and back directions. The grille plate 8 is arranged obliquely downward from front to back. The front side of the grille plate 8 has an oil guiding surface 82. The projection of the oil guiding edge of the upper oil guiding plate 6 in the vertical direction falls on the oil guiding surface 82. That is, the rear edge of the upper oil guiding plate 6 extends backward past the upper guide plate 311 and its projection in the vertical direction falls into the air inlet cavity 313. In this embodiment, the width of the grille channel 81 in the middle region is greater than the width of the grille channels 81 in the left and right side regions, and the grille channel 81 in the middle region corresponds to the oil collection groove position of the upper oil guiding plate 6. Since the oil collection groove is equivalent to an oil collection chamber, it receives more oil. The oil flowing out of the oil collection groove enters the oil cup 5 through the wider grille channel 81, which can improve the oil discharge efficiency and avoid oil overflow from the grille channel 81.

[0031] Each grille channel 81 has an oil drain port 83 at its lowest point. The vertical projection of the oil drain port 83 falls into the oil cup 5. The oil on the grille plate 8 flows into the air intake cavity 313 through the oil drain port 83 and finally into the oil cup 4, reducing the risk of oil spillage.​

[0032] When the lifting range hood is guiding oil, the oil on the fan 4 drips through the oil drain hole 41 onto the upper oil guide plate 6. The oil flows directly backward from the upper oil guide plate 6, and the oil path is straight and short. The entire upper oil guide plate 6 forms an oil guiding surface with a large oil guiding area and wide oil path. After the oil falls into the upper oil guide plate 6, it can quickly disperse and will not accumulate on the upper oil guide plate 6. The oil guided from the upper oil guide plate 6 can pass over the front side of the air inlet 3 and flow directly into the inner cavity of the air inlet body, without having to go around to the sides or back of the air inlet body for oil guiding, thus making the oil guiding smoother and preventing oil path blockage.

[0033] In this embodiment, the lower air inlet channel 92 is located below the rear edge of the upper oil guide plate 6. Since the main body 31 of the air inlet moves up and down within the lower air inlet channel 92, the vertical projection of the rear edge of the upper oil guide plate 6 can always fall on the main body 31 of the air inlet. In addition, the top of the lower air inlet channel 92 can also be higher than the upper oil guide plate 6. That is, when the air inlet 3 is in the raised state, the top of the air inlet 3 will be higher than the upper oil guide plate 6. Even the top of the air inlet 3 and the fan 4 can overlap in the vertical direction. However, in this case, the lower air inlet channel 92 still needs to be located below the rear of the fan 4, and it needs to be ensured that when the air inlet 3 is in the lowered state, the vertical projection of the oil guide edge of the upper oil guide plate 6 falls on the main body 31 of the air inlet, so that the oil flowing down inside the box can pass through the upper oil guide plate 6 and the air inlet 3 and enter the oil cup 5.

[0034] The specification and claims of this invention use terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," to describe various exemplary structural parts and elements of the invention. However, these terms are used herein merely for ease of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A liftable range hood, comprising a housing and an air inlet (3), wherein a fan (4) is installed inside the housing, the fan (4) has an oil drain hole (41) at its bottom, an oil cup (5) is installed at the bottom of the air inlet (3), and the air inlet (3) has an air inlet body main body (31), characterized in that: The housing is equipped with an oil guiding component. The fan (4) is located above the oil guiding component. A lower air inlet channel (92) is formed at the rear lower part of the fan (4). The main body of the air inlet (31) can move up and down in the lower air inlet channel (92). The rear edge of the oil guiding component is the oil guiding edge. The projection of the oil guiding edge in the vertical direction falls on the main body of the air inlet (31). The oil flowing down from the housing enters the oil cup (5) after passing through the air inlet (3) from the oil guiding component. The shortest distance between the orthogonal projection point of the oil leakage hole (41) on the oil guiding component and the oil guiding edge is a. The width of the lower air inlet channel (92) in the front-back direction is b. The width of the housing in the front-back direction is c. Then, the upper edge of the lower front plate (7) is connected to the rear part of the upper oil guiding plate (6), and the lower edge of the lower front plate (7) is connected to the bottom plate (22) of the housing.

2. The lifting range hood according to claim 1, characterized in that: The main body of the air inlet (31) has an upper guide plate (311) and an air inlet back plate (312). The upper guide plate (311) is located on the front side of the air inlet back plate (312) and forms an air inlet inner cavity (313) with the air inlet back plate (312). The rear edge of the upper oil guide plate (6) extends backward beyond the upper guide plate (311) and its projection in the vertical direction falls into the air inlet inner cavity (313).

3. The lifting range hood according to claim 1, characterized in that: A grille (8) is installed on the top of the main body (31) of the air inlet. The front side of the grille (8) is installed on the upper guide plate (311), and the rear side of the grille (8) is installed on the back plate (312) of the air inlet. The projection of the rear edge of the upper oil guide plate (6) in the vertical direction falls on the grille (8).

4. The lifting range hood according to claim 3, characterized in that: The rear edge of the upper oil guide plate (6) extends downward and backward with an oil guide fold (61), and the projection of the rear edge of the oil guide fold (61) in the vertical direction falls on the grid plate (8).

5. The lifting range hood according to claim 4, characterized in that: The upper surface of the grating plate (8) is formed with grating channels (81) for diverting oil. The grating channels (81) are spaced apart in the left and right directions, and each grating channel (81) extends in the front and back directions.

6. The lifting range hood according to claim 4, characterized in that: The grating plate (8) is arranged obliquely downward from front to back. The front side of the grating plate (8) has an oil guiding surface (82). The projection of the rear edge of the upper oil guiding plate (6) in the vertical direction falls on the oil guiding surface (82). Each grating channel (81) has an oil drain (83) at its lowest position. The projection of the oil drain (83) in the vertical direction falls into the oil cup (5).

7. The lifting range hood according to claim 6, characterized in that: The upper oil guide plate (6) is arranged at an angle from front to back and downward.

8. The lifting range hood according to claim 3, characterized in that: ​ 9. The lifting range hood according to claim 1, characterized in that: The upper oil guide plate (6) includes a first oil guide part (62) and a second oil guide part (63) located on the left and right sides of the first oil guide part (62). The first oil guide part (62) has a downwardly recessed oil collection groove, and the oil leakage hole (41) of the fan (4) is located above the oil collection groove.

10. The lifting range hood according to claim 9, characterized in that: The surface area s1 of the first oil guide (62) and the surface area s2 of the second oil guide (63) satisfy 1 <s2 / s1<6。 11. The lifting range hood according to any one of claims 1 to 10, characterized in that: The housing includes an upper housing (1) and a lower housing (2). The lower housing (2) moves up and down relative to the upper housing (1) under the drive of the drive mechanism. The fan (4) is located inside the upper housing (1). The upper oil guide plate (6) is located inside the lower housing (2). The upper oil guide plate (6) has a concave pressing structure formed on it. When the lower housing (2) is raised, the bottom of the fan (4) is accommodated in the pressing structure.

12. The lifting range hood according to any one of claims 1 to 10, characterized in that: The housing includes an upper housing (1) and a lower housing (2). The lower housing (2) moves up and down relative to the upper housing (1) under the drive of the drive mechanism. The lower housing (2) has a lower air inlet channel (92) and an upper air inlet channel (91) inside. The lower air inlet channel (92) is located below and behind the upper air inlet channel (91). The air inlet body (3) moves up and down relative to the lower housing (2) under the drive of the drive mechanism.

13. The lifting range hood according to claim 12, characterized in that: The width W1 of the upper air inlet channel (91) in the front-to-back direction and the width b1 of the lower air inlet channel (92) in the front-to-back direction satisfy: W1≥1.5b1.

14. The lifting range hood according to claim 12, characterized in that: The upper housing (1) also includes a fan frame (11). The fan (4) is a centrifugal fan. The central axis of the impeller of the fan (4) is perpendicular to the rear plate (12) of the fan frame. A main air inlet channel (93) is provided between the rear air inlet (42) of the fan (4) and the rear plate (12) of the fan frame. The width b in the front-to-back direction of the lower air inlet channel (92) and the width W2 in the front-to-back direction of the main air inlet channel (93) satisfy: b > W2.

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