CN111594894A

CN111594894A - Fume exhaust fan

Info

Publication number: CN111594894A
Application number: CN202010404880.4A
Authority: CN
Inventors: 邹志锋; 王磊; 徐鑫; 申志贤
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: 2020-08-28
Anticipated expiration: 2040-05-12
Also published as: CN111594894B

Abstract

The invention discloses a range hood, which comprises a movable component, a fixed component and a movement mechanism for electrically driving the movable component to ascend and descend relative to the fixed component, wherein the movable component comprises a smoke collecting hood, the fixed component comprises a fan frame, and the range hood is characterized in that: the movable component further comprises a moving frame arranged above the smoke collecting cover, an air inlet is formed in the smoke collecting cover, the lower end of the moving frame is connected to the periphery of the air inlet, and the moving frame is wrapped on the periphery of the fan frame. Compared with the prior art, the invention has the advantages that: the movable frame of the movable component is wrapped on the periphery of the fan frame of the fixed component, so that the requirements of an oil way and sealing can be met, and grease collection can be realized and oil dripping can be avoided when the range hood is closed only by arranging an oil collecting component; through setting up the supporting component, can avoid movable part and wall body friction and damage in the in-process of elevating movement, reduce the movement resistance to increase of service life.

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.

Currently, the range hoods commonly available on the market include a top suction type and a side suction type. The top-suction type range hood adopts an oil smoke rising principle, generates a negative pressure area right above a cooking bench, and sucks and exhausts naturally rising oil smoke generated during cooking. The side-suction type range hood has the advantages that the side-suction type range hood is thin in body and not easy to touch the head when in operation, and has a good range hood effect because the installation height is low and the negative pressure area is close to a smoke source in a cooking state with small oil smoke amount.

The top suction type and the side suction type both have the defect of larger overall size, can not be completely wrapped by the cabinet when the cabinet normally works, and have poor hiding effect and aesthetic property.

In order to reduce the negative pressure area or the air inlet, thereby improving the oil smoke absorption effect and meeting the hiding effect and the aesthetic property, a common scheme is to set the structure into a lifting type. The lifting structure and the oil way solving method mainly comprise the following three modes:

1. the diversion component (rectifying plate, smoke guide plate, etc.) goes up and down: the extractor hood disclosed in chinese patent application No. 201811419513.0 includes: the range hood body is provided with an air suction port; the smoke guide plates are provided with at least two smoke guide plates and are combined to cover the air suction ports; and the lifting mechanism is arranged between the smoke guide plate and the range hood body and drives the smoke guide plate to move between the exhaust inlet and the cooking bench. This kind of structure is limited to the promotion effect of inhaling the oil smoke effect, forms certain oil storage space through the hem of smoke deflector self moreover usually, when fluid is more, can have the risk of spilling over.

2. Lifting the whole machine: the combination of the electric lifter and the movable hanger of the range hood disclosed in the Chinese patent with the application number of 200920127994.8 comprises a motor, a gearbox and the movable hanger which are connected in sequence, wherein the motor and the gearbox are connected with a gearbox steel wire rope, and the hanger and the range hood are hung at the lower end. The whole machine with the structure completely descends, the influence on the oil path is avoided, the oil path is similar to a fixed form and is collected by the oil collecting cup at the bottom, but the lifting mode further compresses the operation space of a user, meanwhile, the distance between the fan and the user is reduced after the oil path descends, the noise is further increased, and the user experience is reduced.

3. The smoke collecting cavity is lifted: the top-suction and side-suction liftable range hood disclosed in the chinese patent with application number 201310129629.1 comprises a housing and a fan, wherein a vertical partition plate with a through hole is installed at the lower part of a rear upper horizontal partition plate in the housing to divide the housing into a front part and a rear part, a front oil fume suction hood is installed on a lower port of the front part of the housing, and a front oil fume suction hood is installed on a through hole of a front concave plate of a telescopic housing; the lower smoke exhaust cover is arranged on the lower port of the flue, and a lifting device is arranged between the shell and the telescopic shell. This kind of structure is because the fan system mutual independence in collection petticoat pipe and the wind cabinet, and the fluid that the fan system was thrown away can not pass through telescopic shell and drip, consequently often needs the design of two oil cups just can satisfy the demand of album oil, nevertheless sets up the exquisite degree that two oil cups not only can reduce the complete machine, still greatly increased the clear degree of difficulty of user.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a range hood aiming at the defects of the prior art, which can ensure the oil smoke suction effect in a lifting mode and simultaneously can avoid oil dripping in a closed state by only using a single oil collecting device.

The technical scheme adopted by the invention for solving the technical problems is as follows: a range hood, including movable part, fixed part and being used for the motor-driven motion that drives movable part and fixed part relatively go up and down, the movable part includes collection petticoat pipe, the fixed part includes the fan frame, its characterized in that: the movable component further comprises a moving frame arranged above the smoke collecting cover, an air inlet is formed in the smoke collecting cover, the lower end of the moving frame is connected to the periphery of the air inlet, and the moving frame is wrapped on the periphery of the fan frame.

In order to avoid the damage of the friction between the moving frame and the wall body in the lifting process, the wind power generator further comprises a supporting component arranged on the rear sides of the fan frame and the moving frame, the supporting component comprises a sliding rail and a sliding part, the sliding rail is fixedly connected with the rear side of the fan frame and extends downwards to cross the moving frame, and the sliding part is arranged on the rear side of the moving frame and is matched with the sliding rail in a sliding or rolling mode.

In order to enable the sliding rail to vertically extend at the rear side of the moving frame and be matched with the sliding piece, the sliding rail is provided with an oblique line section and a straight line section, the oblique line section gradually inclines backwards from top to bottom, the straight line section extends up and down, the upper end of the oblique line section is fixedly connected with the fan frame, the lower end of the oblique line section is connected with the upper end of the straight line section, and the oblique line section corresponds to the fan frame.

According to one aspect of the invention, the sliding rail is matched with the sliding part in a rolling manner, the supporting rib is arranged on the forward side of the sliding rail, the sliding part comprises a fixed support and a roller arranged in the fixed support, the fixed support is fixedly connected with the rear side of the moving frame, the roller is rotatably arranged in the fixed support, the rotating shaft of the roller extends in the left-right direction, and the supporting rib is matched with the middle concave part of the roller, so that the sliding rail is matched with the sliding part in a rolling manner.

According to another aspect of the invention, the sliding rail is in sliding fit with the sliding part, the sliding rail is provided with a longitudinally extending guide groove, and the sliding part is a sliding block which can be partially embedded into the guide groove and is in sliding fit with the sliding rail.

Further, the motion mechanism includes a drive mechanism and a transmission mechanism that transmits an output of the drive mechanism to the movable member.

According to one aspect of the invention, the drive mechanism and the transmission mechanism constitute a linear drive module.

According to another aspect of the invention, the transmission mechanism comprises a first connecting rod driven by the driving mechanism to rotate, a second connecting rod arranged to intersect with the first connecting rod, a first sliding groove arranged at the rear side of the fan frame, and a second sliding groove arranged at the rear side of the moving frame, the first sliding groove and the second sliding groove both extend in the left-right direction and are parallel to each other, the first connecting rod and the second connecting rod are connected at the intersection through a first fixing pin, the first fixing pin is fixed with the first connecting rod and is rotatably connected with the second connecting rod, the upper end of the first connecting rod is rotatably connected with the fan frame through a second fixing pin, the first fixing pin and the second fixing pin both extend in the front-rear direction, the upper end of the second connecting rod is slidably arranged in the first sliding groove, and the lower ends of the first connecting rod and the second connecting rod are slidably arranged in the second sliding groove.

In order to transmit the output torque to the first connecting rod conveniently, the transmission mechanism further comprises a gear driven by the driving mechanism to rotate and a rack meshed with the gear, the rotating shaft of the gear extends forwards and backwards, one side of the rack meshed with the gear is arc-shaped, and the rack is fixedly connected with the first connecting rod.

In order to guide the lifting of the movable component, the moving mechanism further comprises a guide mechanism, the guide mechanism comprises a first guide rail and a second guide rail which are in sliding fit, the first guide rail comprises two guide rails which respectively extend up and down on the left side and the right side of the fan frame, and the second guide rail is fixedly connected with the moving frame.

Compared with the prior art, the invention has the advantages that: the movable frame of the movable component is wrapped on the periphery of the fan frame of the fixed component, so that the requirements of an oil way and sealing can be met, and grease collection can be realized and oil dripping can be avoided when the range hood is closed only by arranging an oil collecting component; through setting up the supporting component, can avoid movable part and wall body friction and damage in the in-process of elevating movement, reduce the movement resistance to increase of service life.

Drawings

Fig. 1 is a schematic front view of a range hood according to a first embodiment of the present invention;

fig. 2 is a schematic back view (second position) of the range hood according to the first embodiment of the present invention;

fig. 3 is a schematic back view (second position) of the hidden fan housing of the range hood according to the first embodiment of the present invention;

fig. 4 is a cross-sectional view (second position) of the range hood of the first embodiment of the present invention;

fig. 5 is a schematic view of the movable components of the range hood in the first embodiment of the present invention (hiding the fan housing and the oil cup);

fig. 6 is a partial schematic view of a fixed component and a moving mechanism of the range hood according to the first embodiment of the present invention;

fig. 7 is a schematic view of a support member of the range hood in accordance with the first embodiment of the present invention;

fig. 8 is a schematic back view (first position) of a hidden fan housing of a range hood according to a first embodiment of the present invention;

fig. 9 is a cross-sectional view (first position) of the range hood of the first embodiment of the present invention;

fig. 10 is a schematic back view (second position) of a range hood according to a second embodiment of the present invention;

fig. 11 is a schematic back view (first position) of a range hood according to a second embodiment of the present invention;

fig. 12 is a schematic view of a supporting member of a range hood according to a second embodiment of the present invention.

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 comprises a movable component 1 and a fixed component 2, wherein the movable component 1 comprises a smoke collecting hood 11, a fan housing 12 arranged above the smoke collecting hood 11 and an oil cup 13 arranged at the bottom of the rear side of the smoke collecting hood 11. The movable member 2 includes a fan frame 21 disposed above the smoke collecting hood 11 and a fan system 22 disposed in the fan frame 21. The cross section of the fan housing 12 is in a U shape with an opening facing backward and is wrapped outside the fan frame 21. The fan frame 21 is fixed with the wall, and the movable part 1 can do lifting movement relative to the fixed part 2, thus forming the lifting top-suction type range hood.

The movable component 1 further comprises a moving frame 14 arranged above the smoke collecting hood 11 and on the inner side of the fan housing 12, and the moving frame 14 is a hollow cuboid with openings at the upper end and the lower end. An air inlet 111 is formed on the fume collecting hood 11, and a filter screen 112 can be arranged at the air inlet 111. The lower end of the moving frame 14 is connected to the periphery of the intake opening 111. The moving frame 14 is covered outside the blower housing 21, moves in a space between the inside of the blower housing 12 and the outside of the blower housing 21, and when the movable member 1 is lowered to the lowest position, the upper end of the moving frame 14 is not lower than the lower end of the blower housing 21.

Alternatively, the fan housing 12 may also be connected and fixed with the fan frame 2 to form the fixing part 2.

Example one

Referring to fig. 3, 5 and 6, the range hood further includes a moving mechanism for driving the movable component 1 to ascend and descend relative to the fixed component 2, and the moving mechanism is an electric moving mechanism and includes a driving mechanism 31, a transmission mechanism 32 and a guiding mechanism 33. Among them, the driving mechanism 31 is preferably a motor, and is provided on the top of the blower frame 21 with its output shaft extending in the front-rear direction. The transmission mechanism 32 includes a screw 321 and a slider 322 disposed on the screw 321, the screw 321 extends in the longitudinal direction, and the rotation direction between the screw and the output shaft of the driving mechanism 31 can be achieved by bevel gears or the like. The sliding block 322 is connected to the screw rod 321 in a threaded manner, and when the screw rod 321 is driven by the driving mechanism 31 to rotate around the axis thereof, the sliding block 322 can move up and down along the screw rod 321. The screw 321 may have other structures such as a link and a screw. The driving mechanism 31 and the transmission mechanism 32 form a linear driving module, and alternatively, any other mechanism capable of outputting linear motion in the prior art, such as a motor, a gear and rack, an air cylinder, a hydraulic cylinder, an electric push rod, and the like, may also be used. The sliding block 322 is fixedly connected to the moving frame 14, so as to drive the moving frame 14 to move up and down, and further to move up and down the whole movable component 1.

The guide mechanism 33 includes a first guide rail 331 and a second guide rail 332 in sliding fit, wherein the first guide rail 331 has two rails, and extends up and down on the left and right sides of the fan frame 21, and the left and right sides of the moving frame 14 are respectively provided with an upward extending mounting bracket 141 for connecting and fixing with the second guide rail 332. The guide mechanism 33 guides the up-and-down movement of the movable member 1 so that it can only move up and down in the up-and-down direction.

Since the movable part 1 is covered outside the fixed part 2 for lifting movement in the present invention, the condensed oil on the inner side wall of the blower frame 21 can flow down along the moving frame 14 into the smoke collecting hood 11 and finally be collected by the oil cup 13. In addition, the movable member 1 may be damaged by friction with the wall during the lifting process. Therefore, the range hood further comprises a support part 4 arranged at the rear side of the fan frame 21 and the moving frame 14. Each support member 4 includes a slide rail 41 and a slider 42, the slide rail 41 being fixedly connected to the rear side of the wind turbine frame 21 and extending downwardly across the moving bezel 14. The slide rail 41 has a diagonal section 411 and a straight section 412, wherein the diagonal section 411 gradually inclines backwards from top to bottom, the upper end of the diagonal section 411 is fixedly connected with the wind frame 21, the lower end of the diagonal section 411 is connected with the upper end of the straight section 412, the straight section 412 extends up and down, the diagonal section 411 and the straight section 412 form an integrated slide rail 41, and the diagonal section 411 corresponds to the wind frame 21. This is because the fan frame 21 is located inside the moving frame 14, and therefore, the diagonal member 411 is required to adjust the position of the entire slide rail 41 so as to extend up and down on the rear side of the moving frame 14.

Referring to fig. 7, the slide rail 41 further includes a support rib 413 disposed on a front side of the straight section 412, and the slider 42 includes a fixed bracket 421 and a roller 422 disposed in the fixed bracket 421. The fixed bracket 421 is fixedly connected to the rear side of the moving frame 14, the roller 422 is rotatably disposed in the fixed bracket 421, and the rotation axis of the roller 422 extends in the left-right direction. The support rib 413 is engaged with the middle recess of the roller 422, so that the slide rail 41 and the slider 42 are rollingly engaged to reduce friction.

The range hood has the following three states: a) and (3) a shrinkage state: the movable part 1 is now in the uppermost first position, in which the hood 11, including the hood, is completely or partially concealed within the cabinet, enveloping the cabinet to achieve the fume extraction effect, see fig. 8 and 9; b) in the descending process, the range hood can continuously suck the oil smoke, the driving mechanism 31 of the movement mechanism is started, so that the movable component 1 starts to descend, the stepless regulation is stopped, the user can select to stop at any position in the stroke, and the descending process can identify the distance between the smoke collecting cover 11 and a pot or other vessels and can realize automatic stop before touching appliances; c) maximum protruding state of the movable member 1: referring to fig. 3 and 4, the movable member 1 is lowered to the lowest second position relative to the fixed member 2, in which the distance of the smoke collecting hood 11 from the wall is L, the height of the smoke collecting hood 11 from the cooktop is H, and 0.5< L/H <1 and H ≦ 550mm are satisfied. Thereby ensuring that 1, the negative pressure area is at or below the gold smoking area; 2. the smoke collecting cavity in the smoke collecting cover 11 has a certain volume and a certain smoke collecting effect, and the negative pressure area cannot be too far back, so that smoke leakage from the front side is prevented; 3. when cooking, the range hood (fume collecting hood 11) can not shield the human body from watching the view in the pot.

Through the motion mode between the movable part 1 and the fixed part 2, the movable part 1 is covered outside the fixed part 2, and the movable part 1 is covered outside the fan frame 21 (inner wall of an oil way), so that the problems of the oil way, sealing and the like in the lifting process can be perfectly solved.

Example two

Referring to fig. 9 and 10, unlike the first embodiment, the transmission mechanism 32 of the moving mechanism is different, and in the present embodiment, the transmission mechanism 32 includes a gear 323 disposed on the output shaft of the driving mechanism 31, a rack 324 engaged with the gear 323, a first link 325, a second link 326, a first slide 327 disposed at the rear side of the wind turbine frame 21, and a second slide 328 disposed at the rear side of the moving frame 14. The first runner 327 is preferably located near an upper portion of the rear side of the blower housing 21, and the second runner 328 is preferably located near an upper portion of the rear side of the moving frame 14. The first slide groove 327 and the second slide groove 328 extend in the left-right direction and are parallel to each other, and preferably, are horizontal. The first link 325 and the second link 326 are disposed to intersect and connected at the intersection by a first fixing pin 3291, and the first fixing pin 3291 is fixed to the first link 325 and rotatably connected to the second link 326 such that the second link 326 can rotate about the first fixing pin 3291. Preferably, the first link 325 and the second link 326 cross at an intermediate position. The upper end of the first link 325 is rotatably connected to the blower housing 21 by a second fixing pin 3292, and the first link 325 can rotate about the second fixing pin 3292. The first fixing pin 3291 and the second fixing pin 3292 each extend in the front-rear direction. The upper end of the second connecting rod 326 is slidably disposed in the first sliding slot 327, and the lower ends of the first connecting rod 325 and the second connecting rod 326 are slidably disposed in the second sliding slot 328.

The rotation axis of the gear 323 extends back and forth, the rack 324 is in a sector shape, the teeth 3241 of the rack 324 are arranged on the circular arc periphery of the rack 324, the position of the rack 324 close to the center of the circle is connected with the first connecting rod 325, and the second fixing pin 3292 can be close to the center of the circle of the rack 324. Preferably, the rack 324 and the first link 325 may be integrally formed.

Referring to fig. 12, the slide rail 41 of the support member 4 is provided with a longitudinally extending guide groove 414, and the sliding member 42 is a slider capable of being partially inserted into the guide groove 414 to be slidably engaged with the slide rail 41. The support member 4 of this structure can also be used in the first embodiment.

Alternatively, the supporting component 4 may also be one or more of a sliding rail and a ball, a gear and a rack, a fixed pulley, a movable pulley, a screw rod, a pneumatic spring, a hydraulic spring, and the like, and the supporting structure 4 may support, stabilize and protect the exhaust fume collecting hood 11 from wall surface abrasion during the descending process of the exhaust fume collecting hood 11.

When the driving mechanism 31 is started, the gear 323 can be driven to rotate around the output shaft of the driving mechanism 31, so as to drive the rack 324 to rotate around the second fixed pin 3292, that is, the first connecting rod 325 rotates around the second fixed pin 3292, so as to drive the second connecting rod 326 to rotate around the first fixed pin 3291, because the first connecting rod 325 and the second connecting rod 326 are limited by the first sliding chute 327 and the second sliding chute 328 in terms of movement track, the first connecting rod 325 and the second connecting rod 326 can only increase the included angle between the two or reduce the included angle α between the two, so as to enable the movable component 1 to ascend or descend relative to the fixed component 2, when the included angle α between the two is minimum, see fig. 10, the movable component 1 descends to the lowest second position, and when the included angle α between the two is maximum, see fig. 11, the movable component 1 ascends to the highest first position.

The specification of the invention discloses two motion mechanisms for lifting, and any motion mechanism capable of driving the component to lift in other prior art can be adopted instead.

Claims

1. A range hood comprises a movable component (1), a fixed component (2) and a movement mechanism for electrically driving the movable component (1) to ascend and descend relative to the fixed component (2), wherein the movable component (1) comprises a smoke collecting hood (11), the fixed component (2) comprises a fan frame (21), and the range hood is characterized in that: the movable component (1) further comprises a moving frame (14) arranged above the smoke collecting hood (11), an air inlet (111) is formed in the smoke collecting hood (11), the lower end of the moving frame (14) is connected to the periphery of the air inlet (111), and the moving frame (14) is wrapped on the periphery of the fan frame (21).

2. The range hood of claim 1, wherein: the fan frame is characterized by further comprising a supporting part (4) arranged on the rear side of the fan frame (21) and the rear side of the moving frame (14), the supporting part (4) comprises a sliding rail (41) and a sliding part (42), the sliding rail (41) is fixedly connected with the rear side of the fan frame (21) and extends downwards to cross the moving frame (14), and the sliding part (42) is arranged on the rear side of the moving frame (14) and is in sliding or rolling fit with the sliding rail (41).

3. The range hood of claim 2, wherein: the sliding rail (41) is provided with an oblique line segment (411) and a straight line segment (412), the oblique line segment (411) is inclined backwards gradually from top to bottom, the straight line segment (412) extends up and down, the upper end of the oblique line segment (411) is fixedly connected with the fan frame (21), the lower end of the oblique line segment (411) is connected with the upper end of the straight line segment (412), and the oblique line segment (411) corresponds to the fan frame (21).

4. The range hood of claim 2, wherein: the sliding rail (41) is provided with a supporting rib (413) towards one front side, the sliding piece (42) comprises a fixing support (421) and a roller (422) arranged in the fixing support (421), the fixing support (421) is fixedly connected with the rear side of the moving frame (14), the roller (422) is rotatably arranged in the fixing support (421), the rotating shaft of the roller (422) extends in the left-right direction, and the supporting rib (413) is matched with a middle concave part of the roller (422), so that the sliding rail (41) is in rolling fit with the sliding piece (42).

5. The range hood of claim 2, wherein: the sliding rail (41) is provided with a longitudinally extending guide groove (414), and the sliding part (42) is a sliding block which can be partially embedded into the guide groove (414) and is in sliding fit with the sliding rail (41).

6. The range hood according to any one of claims 1 to 5, wherein: the motion mechanism includes a drive mechanism (31) and a transmission mechanism (32) that transmits an output of the drive mechanism (31) to the movable member (1).

7. The range hood of claim 6, wherein: the driving mechanism (31) and the transmission mechanism (32) form a linear driving module.

8. The range hood of claim 6, wherein: the transmission mechanism (32) comprises a first connecting rod (325) driven by the driving mechanism (31) to rotate, a second connecting rod (326) arranged in a crossed mode with the first connecting rod (325), a first sliding chute (327) arranged on the rear side of the fan frame (21) and a second sliding chute (328) arranged on the rear side of the moving frame (14), the first sliding chute (327) and the second sliding chute (328) extend in the left-right direction and are parallel to each other, the first connecting rod (325) and the second connecting rod (326) are connected at the crossed position through a first fixing pin (3291), the first fixing pin (3291) is fixed with the first connecting rod (325) and is in rotating connection with the second connecting rod (326), the upper end of the first connecting rod (325) is in rotating connection with the fan frame (21) through a second fixing pin (3292), and the first fixing pin (3291) and the second fixing pin (3292) extend in the front-back direction, the upper end of the second connecting rod (326) is arranged in the first sliding groove (327) in a sliding mode, and the lower ends of the first connecting rod (325) and the second connecting rod (326) are arranged in the second sliding groove (328) in a sliding mode.

9. The range hood of claim 8, wherein: the transmission mechanism (32) further comprises a gear (323) driven by the driving mechanism (31) to rotate and a rack (324) meshed with the gear (323), the rotating shaft of the gear (323) extends forwards and backwards, one side, meshed with the gear (323), of the rack (324) is arc-shaped, and the rack (324) is fixedly connected with the first connecting rod (325).

10. The range hood of claim 6, wherein: the movement mechanism further comprises a guide mechanism (33), the guide mechanism (33) comprises a first guide rail (331) and a second guide rail (332) which are in sliding fit, the first guide rail (331) is provided with two guide rails which respectively extend up and down on the left side and the right side of the fan frame (21), and the second guide rail (332) is fixedly connected with the movement frame (14).