CN111735086B

CN111735086B - Fume exhaust fan

Info

Publication number: CN111735086B
Application number: CN202010397782.2A
Authority: CN
Inventors: 陈源
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2020-05-12
Filing date: 2020-05-12
Publication date: 2022-03-18
Anticipated expiration: 2040-05-12
Also published as: CN111735086A

Abstract

The invention discloses a range hood, which comprises a smoke collecting cover, wherein a smoke collecting cavity is formed at the inner side of the smoke collecting cover, an air inlet is formed in the smoke collecting cover, a smoke collecting assembly is arranged below the air inlet and comprises a first smoke collecting plate and at least two second smoke collecting plates arranged on the periphery of the first smoke collecting plate, the smoke collecting assembly can be positioned at a first position which is sealed between the first smoke collecting plate and the second smoke collecting plate and between two adjacent second smoke collecting plates, and the smoke collecting assembly can be positioned between the first smoke collecting plate and the second smoke collecting plate and between two adjacent second smoke collecting plates to form a gap so as to form a second position of a smoke inlet. Compared with the prior art, the invention has the advantages that: through the action of the first cigarette gathering cavity and the second cigarette gathering plate, the convenience of cleaning and a better oil smoke absorption effect can be ensured; through the lifting of the middle first smoke gathering plate and the rotation of the peripheral second smoke gathering plate, the depth of the smoke gathering cavity and the width of the smoke inlet can be synchronously adjusted according to requirements, and the oil smoke absorption effect under different conditions is improved.

Description

Fume exhaust fan

Technical Field

The invention relates to an oil fume purification device, in particular to a range hood.

Background

The range hood has become one of the indispensable kitchen household electrical appliances in modern families. The range hood works by utilizing the fluid dynamics principle, sucks and exhausts oil smoke through a centrifugal fan arranged in the range hood, and filters partial grease particles by using a filter screen. The centrifugal fan comprises a volute, an impeller arranged in the volute and a motor driving the impeller to rotate. When the impeller rotates, negative pressure suction is generated in the center of the fan, oil smoke below the range hood is sucked into the fan, accelerated by the fan and then collected and guided by the volute to be discharged out of a room.

The top-suction type range hood adopts an oil smoke rising principle, a negative pressure area is generated right above a cooking bench to suck and exhaust naturally rising oil smoke generated during cooking, and the range hood has the advantages of fashionable and concise appearance, larger air volume, larger space and capability of capturing the oil smoke far away from the cooking bench, and has the defects that the installation height is far away from the cooking bench, and the oil smoke above a pot is easy to be disturbed by ambient air to cause the escape of the oil smoke to the periphery under the cooking state with small oil smoke volume, so that the oil smoke suction effect is poor.

As described above, since the smoke collection portion is far from the smoke generation area, a cavity having a certain depth is mostly provided in order to improve the smoke absorption effect. The range hood disclosed in the chinese patent with the application number of 201811612663.3 comprises a smoke collecting cover with a smoke collecting cavity arranged therein, and further comprises a smoke guiding component which can stretch out of the smoke collecting cavity, wherein a smoke guiding air port arranged along the circumferential direction is arranged on the bottom wall of the smoke guiding component to form a circumferential smoke guiding air curtain, so that smoke flows to the smoke collecting cavity through the inner cavity of the circumferential smoke guiding air curtain. However, the smoke collection cavity is used as a smoke collection area when the range hood works, so that the smoke collection cavity is easily contaminated by oil smoke and needs to be cleaned frequently. But because of the requirement of gathering the cigarette, the cavity degree of depth is big, and the corner is many, and it is comparatively inconvenient to get up to clean.

The range hood without the smoke collection cavity is convenient to clean, but the smoke suction effect is greatly reduced, and the range hood cannot cope with the large oil smoke environment of the Chinese kitchen.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a range hood aiming at the defects in the prior art, which is convenient for cleaning a smoke collection cavity and can ensure the smoke suction effect.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a range hood, includes the collection petticoat pipe, collection petticoat pipe inboard is formed with the collection smoke chamber to the undercut, the air intake has been seted up at the top in collection smoke chamber to the collection petticoat pipe, the below of air intake is provided with holds together cigarette subassembly, its characterized in that: gather together the cigarette subassembly and include that first two at least second that hold together the cigarette board and set up in first cigarette board periphery hold together the cigarette board, it can be in first cigarette board and second and hold together between the cigarette board, two adjacent second hold together the confined primary importance between the cigarette board to hold together the cigarette subassembly, it can also be in first cigarette board and second and hold together between the cigarette board, adjacent two second hold together and form the second position that has the seam and then constitute the inlet cigarette between the cigarette board.

Preferably, first hold together the cigarette board and the second holds together the change that the cigarette board realized the position relation through going up and down, rotatory mode, still including being used for the drive to hold together the motion of cigarette subassembly action, motion includes the actuating mechanism who is used for driving first holding together the cigarette board and goes up and down, and the one end rotation of every second holding together the cigarette board is connected at the collection cigarette chamber of collection petticoat pipe inboard to can be around rotatory with the junction in collection cigarette chamber.

In order to facilitate the lifting of the first smoke collecting plate, a fan frame is arranged above the smoke collecting cover, the moving mechanism further comprises a transmission mechanism, the transmission mechanism comprises guide rails fixed on the left side and the right side of the fan frame respectively, and supports fixed on the left side and the right side of the upper surface of the first smoke collecting plate and driven by the driving mechanism to lift, the guide rails longitudinally extend, and the supports upwards extend into the guide rails and slide relative to the guide rails.

In order to facilitate transmission between the driving mechanism and the support, a rack is fixedly arranged on the support, and a gear is arranged on an output shaft of the driving mechanism and meshed with the rack.

The first cigarette holding plate and the second cigarette holding plate are linked for facilitating realization, the motion mechanism further comprises a transmission mechanism, the transmission mechanism comprises a lifting linkage seat arranged between the first cigarette holding plate and the at least one second cigarette holding plate, the lifting linkage seat comprises a lifting linkage main seat arranged on the first cigarette holding plate, a lifting linkage auxiliary seat arranged on the second cigarette holding plate and a lifting linkage pin connected between the lifting linkage main seat and the lifting linkage auxiliary seat, one end of the lifting linkage pin is rotatably connected with one of the lifting linkage main seat and the lifting linkage auxiliary seat, the other end of the lifting linkage pin is rotatably connected with the other of the lifting linkage main seat and the lifting linkage auxiliary seat, and the two adjacent second cigarette holding plates are movably connected.

In order to realize that each second holds together the synchronous rotation of cigarette board, drive mechanism includes holds together the cigarette board at every second and holds together the synchronous seat of rotation that the cigarette board is close to the setting with adjacent second, is connected with the synchronous round pin of rotation between the synchronous seat of per two adjacent rotations, rotate synchronous round pin and corresponding synchronous seat sliding connection of rotation to make two adjacent seconds hold together cigarette board swing joint.

Preferably, the rotation synchronizing pin is L-shaped, two ends of the rotation synchronizing pin penetrate into the corresponding rotation synchronizing seats respectively, and each rotation synchronizing pin can slide along the axis of the rotation synchronizing seat relative to the corresponding rotation synchronizing seat in a linear mode.

Preferably, the first cigarette board of holding together is rectangle, the second is held together the cigarette board and is distributed at the first four sides of holding together the cigarette board, the second is held together the cigarette board and is trapezoidal, the second is held together the less one end of cigarette board size and is close to the first cigarette board of holding together, the great one end of size then is connected with album cigarette chamber inboard, and the axis of rotation that the second that is located first both sides of holding together the cigarette board is held together the cigarette board extends in the left and right directions, and the axis of rotation that the second that is located first both sides of holding together holds together the cigarette board extends in the front and back directions.

In order to clean the smoke collecting hood and avoid tainting odor when the range hood is in a non-working state, the second smoke collecting plate is connected with the bottom of the smoke collecting cavity, and when the smoke collecting assembly is in a first position, the smoke collecting assembly is flushed with the bottom of the smoke collecting cavity.

Preferably, in order to avoid pressure release, one end of each second smoke collecting plate is connected with the smoke collecting hood through a hinge, and a sealing gasket is arranged at the joint of the second smoke collecting plate and the smoke collecting hood.

Compared with the prior art, the invention has the advantages that: through the action of the first cigarette gathering cavity and the second cigarette gathering plate, the convenience of cleaning and a better oil smoke absorption effect can be ensured; through the lifting of the middle first smoke collecting plate and the rotation of the peripheral second smoke collecting plate, the depth of the smoke collecting cavity and the width of the smoke inlet can be synchronously adjusted according to requirements, and the oil smoke absorption effect under different conditions is improved; when the machine is turned off, the bottom surface of the smoke collecting cavity is an integral plane, so that the machine is convenient to clean, and smoke falling and odor tainting are avoided.

Drawings

Fig. 1 is a schematic view of a range hood in a closed state according to an embodiment of the present invention;

FIG. 2 is a schematic view of a smoke collecting hood, a smoke collecting assembly and a movement mechanism thereof in a closed state of the range hood according to the embodiment of the invention;

fig. 3 is a schematic view of the range hood according to the embodiment of the present invention in a closed state to hide the fan housing;

FIG. 4 is a schematic diagram of an intermediate state of the range hood according to the embodiment of the present invention;

FIG. 5 is a schematic view of a smoke collecting hood, a smoke collecting assembly and a movement mechanism thereof in an intermediate state of the range hood according to the embodiment of the invention;

fig. 6 is a schematic view of a hidden fan housing in an intermediate state of the range hood according to the embodiment of the present invention;

fig. 7 is a schematic view of the operating state of the range hood according to the embodiment of the present invention;

fig. 8 is a schematic view of a smoke collecting hood, a smoke collecting assembly and a movement mechanism thereof in the operating state of the range hood according to the embodiment of the invention;

fig. 9 is a schematic view of the range hood according to the embodiment of the present invention, in which the fan housing is hidden when the range hood is in a working state.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to fig. 1 to 4, a range hood, which is a ceiling range hood, includes a fume collecting hood 1, and a fan frame 2 disposed above the fume collecting hood 1, wherein the fan frame 2 is used for installing a fan system (not shown). A fan outer cover 3 is arranged outside the fan frame 2, and the cross section of the fan outer cover 3 can be U-shaped and is opened towards the rear side. An upward-concave smoke collection cavity 11 is formed on the inner side of the smoke collection cover 1, and an air inlet 12 is formed at the top of the smoke collection cavity 11 of the smoke collection cover 1, so that oil smoke can enter the fan frame 2 from the smoke collection cavity 11 through the air inlet 12. The bottom and top of the smoke collection chamber 11 are both rectangular and the bottom is larger than the top. In the present embodiment, the bottom surface of the preferred fume collecting hood 1 is gradually inclined downward from front to back to form a wedge-shaped fume collecting chamber 11.

The cigarette gathering assembly 4 is arranged below the air inlet 12, the cigarette gathering assembly 4 comprises a first cigarette gathering plate 41 and a rotatable second cigarette gathering plate 42, the first cigarette gathering plate 41 is located in the middle and capable of lifting, the rotatable second cigarette gathering plate 42 is located on the periphery of the first cigarette gathering plate 41, and the second cigarette gathering plate 42 is provided with at least two cigarette gathering plates. In this embodiment, the first cigarette collecting plate 41 is preferably rectangular, and the second cigarette collecting plates 42 are distributed on four sides of the first cigarette collecting plate 41. The second cigarette holding plate 42 is trapezoidal, and the end with smaller size is close to the first cigarette holding plate 41, and the end with larger size is rotatably connected to the inner side of the cigarette collecting cavity 11, such as the inner side bottom of the cigarette collecting cavity 11 in this embodiment. More preferably, the second cigarette collecting plate 42 is isosceles trapezoid. Wherein, the second cigarette holding plate 42 located at the front and back sides of the first cigarette holding plate 41 has its rotation axis extending in the left and right direction, and the second cigarette holding plate 42 located at the left and right sides of the first cigarette holding plate 41 has its rotation axis extending in the front and back direction. The cigarette gathering assembly 4 is driven by the moving mechanism, the first cigarette gathering plate 41 performs lifting motion, and the second cigarette gathering plate 42 performs rotating motion, so that the depth adjustment of the cigarette gathering cavity 11 below the cigarette gathering assembly 4 is realized. In a closed state, the surface formed by the bottom surfaces of the first cigarette collecting plate 41 and the second cigarette collecting plate 42 is close to a plane, and the gap between the first cigarette collecting plate 41 and the second cigarette collecting plate 42 is closed (first position), and the cigarette collecting component 4 is flush with the bottom of the cigarette collecting cavity 11, is in a form without the cigarette collecting cavity, and is convenient to clean. Referring to fig. 7, in an operating state, 8 slits (second positions) are formed between the first cigarette collecting plate 41 and each second cigarette collecting plate 42 and between two adjacent second cigarette collecting plates 42, and these slits form a cigarette inlet 43, so that the oil smoke can enter the upper part of the cigarette collecting assembly 4 through the cigarette inlet 43 from the lower part of the cigarette collecting assembly 4 and enter the blower frame 2 through the air inlet 11.

The length-width ratio of the first cigarette holding plate 41 can be adjusted according to actual requirements, and the central axes of the second cigarette holding plates 42 at the periphery and the central axes of the first cigarette holding plate 41 in the length-width directions are respectively superposed.

Referring to fig. 2 and 3 again, one end of each second cigarette collecting plate 42 is connected with the corresponding inner bottom of the cigarette collecting cavity 11 through a hinge 44, and the hinge 44 is located on the upward side of the second cigarette collecting plate 42. A sealing gasket 45 is arranged at the joint of the second smoke collecting plate 42 and the smoke collecting cover 1. This is because a small gap is required to be left between the rotating side surface of the second smoke collecting plate 42 and the side wall of the smoke collecting cavity 11 of the smoke collecting cover 1 to avoid interference during the rotation process, and the sealing gasket 45 is attached to ensure that the pressure is not released at the gap during the operation. In order to ensure the reliability of the connection and to balance the second smoke collecting plate 42 during rotation, two spaced hinges 44 are provided between each second smoke collecting plate 42 and the smoke collecting cover 1.

The range hood also comprises a movement mechanism for driving the smoke collecting component 4 to act. The movement mechanism includes a drive mechanism 51 and a transmission mechanism. The driving mechanism 51 is a motor in this embodiment, and has two driving mechanisms, which are respectively fixedly disposed at the left and right sides of the fan frame 2. The transmission mechanism comprises guide rails 521 respectively fixed on the left side and the right side of the fan frame 2 and brackets 522 respectively fixed on the left side and the right side of the upper surface of the first cigarette collecting plate 41, the guide rails 521 extend longitudinally, and the brackets 522 extend upwards into the guide rails 521 and slide relative to the guide rails 521. The rack 523 is fixedly disposed on the bracket 522, and the guide rail 521, the bracket 522 and the rack 523 all extend in the longitudinal direction. In order to match the structure of the wedge-shaped smoke collecting cavity 11, the guide rail 521 can be inclined forward at a certain angle from top to bottom relative to the vertical direction. The output shaft of the driving mechanism 51 is provided with a gear 524, and the gear 524 is meshed with the rack 523, so that when the driving mechanism 51 is started, the bracket 522 can be driven to lift relative to the guide rail 521 through the meshing fit of the gear 524 and the rack 523, and the lifting of the first cigarette collecting plate 41 is realized.

First cigarette board 41 also can adopt other drive structure that can realize the translation, sharp drive module promptly, like electric putter, the guide rail adds the wire rope and pulls etc. and replace the cooperation structure of rack and pinion of this application. The fan housing 3 is arranged outside the above-mentioned parts of the movement mechanism, avoiding exposure.

In order to facilitate the first cigarette collecting plate 41 to drive the second cigarette collecting plate 42 to rotate when lifting, the first cigarette collecting plate 41 and the at least one second cigarette collecting plate 42 are movably connected to realize linkage. In this embodiment, the transmission mechanism further includes a lifting linkage seat 525 disposed between the first cigarette collecting plate 41 and the second cigarette collecting plates 42 on the left and right sides. The lifting linkage base 525 comprises a lifting linkage main base 5251 arranged on the first cigarette holding plate 41, a lifting linkage auxiliary base 5252 arranged on the second cigarette holding plate 42 and a lifting linkage pin 5253 connected between the lifting linkage main base 5251 and the lifting linkage auxiliary base 5252, wherein one end of the lifting linkage pin 5253 is rotatably connected with one of the lifting linkage main base 5251 and the lifting linkage auxiliary base 5252, and the other end of the lifting linkage pin 5253 penetrates through the other one of the lifting linkage main base 5251 and the lifting linkage auxiliary base 5252 and can slide relative to the other one of the lifting linkage main base 5251 and the lifting linkage auxiliary base 5252. In the present embodiment, the lifting linkage seat 525 is disposed between the first cigarette collecting plate 41 and the second cigarette collecting plates 42 on the left and right sides. The lifting linkage seat 525 is arranged on the upward side of the cigarette collecting component 4. The rotation shaft of the elevation interlocking pin 5253 extends in the front-rear direction. Through the lifting linkage seats 525 on the two sides, the first cigarette holding plate 41 can transmit the rotating torque to the second cigarette holding plates 42 on the left and right sides when lifted, and the second cigarette holding plates 42 on the left and right sides are driven to rotate. Alternatively, the first cigarette collecting plate 41 and the second cigarette collecting plate 42 may be driven independently.

From this, the second is held together cigarette board 42 and has been realized the dead axle (the axle of being connected with collection petticoat pipe 1) and rotate, and in the in-process that first is held together cigarette board 41 and rises, second is held together cigarette board 42 and is upwards rotatory around the junction with collection petticoat pipe 1 for the second is held together the gap formation and the increase between cigarette board 42 and the first cigarette board 41 of holding together, and the gap formation and the increase between two adjacent second are held together cigarette board 42, and finally stops to constitute into mouth 43 in required position.

In order to facilitate the synchronous rotation of the second cigarette collecting plates 42, two adjacent second cigarette collecting plates 42 are movably connected. The transmission mechanism further comprises a rotation synchronizing seat 526 arranged at the position where each second cigarette holding plate 42 is close to the adjacent second cigarette holding plate 42, and a rotation synchronizing pin 5261 is connected between every two adjacent rotation synchronizing seats 526. Every two adjacent rotation synchronizing seats 526 are perpendicular to each other, and thus the rotation synchronizing pin 5261 is L-shaped. Both ends of the rotation synchronizing pin 5261 are respectively inserted into the corresponding rotation synchronizing seats 526, and each rotation synchronizing pin 5261 can slide linearly along its own axis relative to the corresponding rotation synchronizing seat 526. Therefore, when the left second cigarette holding plate 42 and the right second cigarette holding plate 42 rotate, the front second cigarette holding plates 42 and the rear second cigarette holding plates 42 are driven to rotate synchronously by rotating the connecting seat 526, and synchronous rotation of the four second cigarette holding plates 42 is ensured. When the first cigarette holding plate 41 is lifted, the second cigarette holding plates 42 are rotated upward, the distance between the rotation synchronizing seats 526 between two adjacent second cigarette holding plates 42 is gradually increased, and the portions of the rotation synchronizing pins 5261 exposed to the rotation synchronizing seats 526 are increased.

Through the movement mechanism with the structure, as long as the first cigarette holding plate 41 is controlled to move up and down in a translation manner, the consistency of the actions of the other four second cigarette holding plates 42 is ensured by the rotation synchronization seat 526, and the four second cigarette holding plates 42 are driven by the lifting linkage seat 525 to transfer the lifting of the first cigarette holding plate 41 into the rotation of the four second cigarette holding plates 42.

Referring to fig. 1 to 3, the range hood is in a closed state, and the smoke collection assembly 4 closes the smoke collection cavity 11. Referring to fig. 4 to 6, when the range hood needs to start working, the moving mechanism of the smoke gathering assembly 4 is started to drive the first smoke gathering plate 41 upwards, so that the second smoke gathering plate 42 rotates, and a gap between the first smoke gathering plate 41 and the second smoke gathering plate 42 and a gap between the adjacent second smoke gathering plates 42 are gradually opened. Referring to fig. 7 to 9, the cigarette gathering assembly 4 continues to move until the first cigarette gathering plate 41 rises to a desired height (at which time the second cigarette gathering plate 42 rotates at a desired angle), and the gap between the first cigarette gathering plate 41 and the second cigarette gathering plate 42 and the gap between adjacent second cigarette gathering plates 42 are increased to a desired size to form a cigarette inlet 43. By controlling the height of the first cigarette collecting plate 41 which rises upward, the height of the cigarette collecting chamber 11 below the cigarette collecting assembly 4 can be controlled.

Because the two driving mechanisms 51 are independent of each other, the cigarette collecting assembly 4 can be in a front-back symmetrical state, a left-right asymmetrical state or a front-back asymmetrical state.

Claims

1. The utility model provides a range hood, includes collection petticoat pipe (1), collection petticoat pipe (1) inboard is formed with collection smoke chamber (11) that make progress sunken, air intake (12) have been seted up at the top of collection smoke chamber (11) collection petticoat pipe (1), the below of air intake (12) is provided with and holds together cigarette subassembly (4), its characterized in that: the cigarette gathering component (4) comprises a first cigarette gathering plate (41) and second cigarette gathering plates (42) arranged on the periphery of the first cigarette gathering plate (41), the first cigarette gathering plate (41) is rectangular, the second cigarette gathering plates (42) are distributed on four side faces of the first cigarette gathering plate (41), the second cigarette gathering plates (42) are trapezoidal, one end of the second cigarette gathering plate (42) with a smaller size is close to the first cigarette gathering plate (41), and one end of the second cigarette gathering plate (42) with a larger size is connected with the inner side of the cigarette gathering cavity (11);

the range hood also comprises a movement mechanism for driving the smoke gathering assembly (4) to move, the movement mechanism comprises a driving mechanism (51) for driving the first smoke gathering plate (41) to lift, one end of each second smoke gathering plate (42) is rotatably connected to the inner side of the smoke gathering cavity (11) of the smoke gathering cover (1) and can rotate around the connection part of the smoke gathering cavity (11), the rotating shafts of the second smoke gathering plates (42) positioned on the front side and the rear side of the first smoke gathering plate (41) extend in the left-right direction, and the rotating shafts of the second smoke gathering plates (42) positioned on the left side and the right side of the first smoke gathering plate (41) extend in the front-rear direction;

gather together cigarette subassembly (4) and can be in first between cigarette board (41) and the second cigarette board (42) of holding together, the closed primary importance between two adjacent second cigarette boards (42), motion can be with first cigarette board (41) of holding together upwards drive from the primary importance for the second holds together cigarette board (42) rotatory, makes first cigarette board (41) and second hold together the gap between cigarette board (42), the gap between adjacent second cigarette board (42) is opened gradually, by this it can also be in first cigarette board (41) and second and hold together between cigarette board (42), adjacent two second hold together and be formed with the gap between cigarette board (42) and then constitute the second place of advancing cigarette mouth (43).

2. The range hood of claim 1, wherein: collect petticoat pipe (1) top and be provided with fan frame (2), motion still includes drive mechanism, drive mechanism is including fixing guide rail (521) in the fan frame (2) left and right sides respectively, fixing respectively and holding together support (522) that cigarette board (41) upper surface left and right sides was gone up and down by actuating mechanism (51) drive, guide rail (521) vertically extend, support (522) upwards extend into in guide rail (521) and relative guide rail (521) slide.

3. The range hood of claim 2, wherein: a rack (523) is fixedly arranged on the support (522), a gear (524) is arranged on an output shaft of the driving mechanism (51), and the gear (524) is meshed with the rack (523).

4. The range hood of claim 1, wherein: the motion mechanism still includes drive mechanism, drive mechanism includes holding together cigarette board (41) and at least one second at first and holding together lift linkage seat (525) that sets up between cigarette board (42), lift linkage seat (525) including set up first lift linkage main tributary seat (5251) on holding together cigarette board (41), set up the second and hold together vice seat (5252) of lift linkage on cigarette board (42), and connect lift linkage pin (5253) between lift linkage main tributary seat (5251) and lift linkage vice seat (5252), the one end and lift linkage main tributary seat (5251) of lift linkage pin (5253) rotate with one in lift linkage main tributary seat (5251) and the lift linkage vice seat (5252) and be connected, the other end then with lift linkage main tributary seat (5251) and another sliding connection in the lift linkage vice seat (5252), two adjacent second cigarette board (42) swing joint.

5. The range hood of claim 4, wherein: drive mechanism includes to hold together cigarette board (42) and adjacent second and holds together the synchronous seat of rotation (526) that cigarette board (42) are close to the department setting at every second, is connected with between per two adjacent synchronous seats of rotation (526) to rotate synchronous round pin (5261), rotate synchronous round pin (5261) and corresponding synchronous seat of rotation (526) sliding connection to make two adjacent second hold together cigarette board (42) swing joint.

6. The range hood of claim 5, wherein: the rotating synchronizing pin (5261) is L-shaped, two ends of the rotating synchronizing pin (5261) respectively penetrate into the corresponding rotating synchronizing seats (526), and each rotating synchronizing pin (5261) can linearly slide relative to the corresponding rotating synchronizing seat (526) along the axis of the rotating synchronizing pin.

7. The range hood according to any one of claims 1 to 6, wherein: the second cigarette gathering plate (42) is connected with the bottom of the cigarette gathering cavity (11), and when the cigarette gathering component (4) is located at the first position, the cigarette gathering component (4) is flush with the bottom of the cigarette gathering cavity (11).

8. The range hood according to any one of claims 1 to 6, wherein: one end of each second smoke collecting plate (42) is connected with the smoke collecting cover (1) through a hinge (44), and a sealing gasket (45) is arranged at the joint of the second smoke collecting plate (42) and the smoke collecting cover (1).