CN112539428A

CN112539428A - Fume exhaust fan

Info

Publication number: CN112539428A
Application number: CN202010609861.5A
Authority: CN
Inventors: 陈斌; 施旭娜
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2020-03-27
Filing date: 2020-06-29
Publication date: 2021-03-23
Anticipated expiration: 2040-06-29
Also published as: CN112539428B; CN111442312B; CN215863589U; CN213237677U; CN112539433A; CN112539437A; CN111442312A; CN212618541U; CN112539434A; CN112539436A; CN212618543U; CN212618542U; CN112539431A; CN112539430A; CN111561721A; CN215259982U; CN112539429A; CN112539435A; CN112539436B; CN112539434B

Abstract

The invention discloses a range hood, which comprises a shell and a lower panel assembly movably arranged on the front side of the shell, wherein an air inlet is formed in the front side of the shell, when the lower panel assembly is positioned at a first position, the air inlet is closed by the lower panel assembly, when the lower panel assembly is positioned at a second position, the air inlet is opened, the lower panel assembly is positioned in front of the shell, the range hood also comprises a movement mechanism which can drive the lower panel assembly to move between the first position and the second position in a translation and rotation mode, the movement mechanism comprises a first hinge and a second hinge, the first hinge and the second hinge are respectively and rotatably connected in the shell, the first hinge and the second hinge are respectively and rotatably connected with the lower panel assembly, the rotating shafts of the first hinge and the second hinge respectively extend in the left-right direction, and the movement mechanism also comprises a rotating center which can apply thrust to the first hinge or the second hinge in the shell, Thereby counteracting the gravitational moment of the lower panel assembly.

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 existing side-draft range hood is generally provided with an air inlet on a panel, so that in order to avoid the problem that the air inlet is exposed out and not beautiful enough and oil smoke flows backward when the range hood does not work, the air inlet can be provided with a smoke baffle plate, and the range hood can also play a role of gathering smoke when in work. The suspension fixing structure of the smoke baffle plate of the range hood, disclosed in the Chinese patent with the application number of 201721592791.7, mainly comprises a range hood main body and the smoke baffle plate, wherein a smoke collecting cover is arranged on the range hood main body, a smoke collecting cavity is arranged above the smoke collecting cover, a smoke baffle assembly is arranged in the middle of the smoke collecting cavity and comprises a fixed part on the upper part and a detachable part on the lower part, the fixed part is an operating area, and the detachable part is the smoke baffle plate.

The range hood only has the smoke baffle part capable of being opened when in work, the area of the air inlet is seriously reduced, the effect of absorbing oil smoke is poor, and the oil smoke is easy to escape along the lower panel. In addition, generally, the upper panel is turned over, and the oil smoke inlet is arranged on the upper side of the box body, so that the path of the oil smoke rising process is too long, and when the oil smoke hits the lower panel, the oil smoke easily runs from two sides.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a range hood, which can reduce and enlarge an air inlet and improve the range hood effect, aiming at the defects in the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a range hood, includes casing and the activity sets up the lower panel assembly in the casing front side, the casing front side is opened and is equipped with the air intake, when lower panel assembly is in the first position, the air intake is closed by lower panel assembly, when lower panel assembly is in the second position, the air intake is opened, lower panel assembly is located casing the place ahead, its characterized in that: the range hood further comprises a moving mechanism which can drive the lower panel assembly to move between a first position and a second position in a translation and rotation mode, the moving mechanism comprises a first hinge and a second hinge, the first hinge and the second hinge are respectively and rotatably connected in the shell, the first hinge and the second hinge are respectively and rotatably connected with the lower panel assembly, rotating shafts of the first hinge and the second hinge respectively extend in the left-right direction, and the moving mechanism further comprises a balancing device which can apply thrust to a rotating center of the first hinge or the second hinge in the shell so as to offset the gravity moment of the lower panel assembly.

Preferably, the joint of the first hinge and the lower panel assembly is located above the joint of the second hinge and the lower panel assembly, the output end of the balancing device is connected with the rotation center of the second hinge, and the joints of the balancing device and the lower panel assembly and the second hinge are respectively located on two sides of the rotation center of the second hinge.

Preferably, the housing comprises a top rear plate, the balancing device is a gas balancer, the outer side of the cylinder body of the balancing device is hinged to the top of the top rear plate of the housing, and the end of the piston rod of the balancing device is hinged to the top end of the second hinge.

In order to enable the air inlet to be close to a smoke source and improve the effect of oil smoke absorption, the front side of the shell is further fixedly provided with an upper panel, the air inlet is located below the upper panel, and the second position of the lower panel assembly is located on the front side of the upper panel.

In order to facilitate the rotation of the first hinge and the second hinge, the movement mechanism further comprises a support beam fixed in the shell, and the first hinge and the second hinge are respectively connected with the support beam in a rotating manner.

In order to enhance the rigidity of the shell and improve the anti-falling capacity in the transportation process, the front side of the shell is further fixedly provided with an upper panel, the shell comprises a top rear plate, and two ends of the supporting beam are respectively connected and fixed with the upper panel and the rear plate of the top rear plate of the shell.

Further, in order to transmit the driving force to the second hinge for rotation, the motion mechanism further comprises a first connecting rod and a second connecting rod, wherein one end of the second connecting rod is hinged with the second hinge, and the other end of the second connecting rod is hinged with one end of the first connecting rod. The other end of the first link may be connected to a member that outputs driving force, such as a driving mechanism, a coupling shaft, or the like.

For making the both sides synchronous motion of lower panel subassembly, the motion has two, one of them is the initiative end, and another is the driven end, and the motion who is regarded as the initiative end still includes the actuating mechanism who is used for driving first link pivoted, be connected with between the output of actuating mechanism and the first link of the motion of driven end and make driven end and initiative end synchronous even axle, even axle extends in the left and right direction.

According to one aspect of the invention, the drive mechanism is an electric motor, the output shaft of which is connected to the first link directly or indirectly via a reduction mechanism.

According to another aspect of the invention, the driving mechanism is an electric push rod, the motion mechanism further comprises a third connecting rod, one end of the third connecting rod is rotatably connected with the output end of the electric push rod, the other end of the third connecting rod is sleeved on the periphery of the connecting shaft and fixedly connected, one end of the first connecting rod is sleeved on the periphery of the connecting shaft and fixedly connected, and the other end of the first connecting rod is rotatably connected with the second connecting rod.

Compared with the prior art, the invention has the advantages that: through on the motion of double hinge, set up the balancing unit who exerts thrust to the center of rotation of hinge, can effectual reduction operation in-process load maximum value and the homogeneity of load distribution, improve the operating mode of actuating mechanism operation, improved motion's stability, moreover, under the condition of outage suddenly, balancing unit has increased motion's self-locking power, has improved motion's security.

Drawings

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

fig. 2 is a schematic view of the opening state of the range hood according to the first embodiment of the present invention;

fig. 3 is a side view of the open position of the first embodiment of the range hood of the present invention;

FIG. 4 is a partial schematic view of a range hood according to a first embodiment of the present invention in a closed state;

fig. 5 is a cut-away perspective view of the kinematic mechanism of the first embodiment of the extractor hood of the present invention in a closed state of the lower panel assembly;

fig. 6 is a cross-sectional side view of the kinematic mechanism of the first embodiment of the range hood of the present invention with the lower panel assembly in a closed state;

fig. 7 is a side view of the moving mechanism of the first embodiment of the range hood of the present invention in an open state of the lower panel assembly;

fig. 8 is a partial schematic view of a second connecting rod of the moving mechanism of the lower panel assembly of the range hood according to the first embodiment of the present invention;

fig. 9 is a side view of the first embodiment of the range hood of the present invention with the lower panel assembly in an open intermediate position (with the blower housing and blower system omitted);

fig. 10 is a sectional view of a second embodiment of the range hood of the present invention in a closed state;

fig. 11 is a partial schematic view of a closed-state movement mechanism of a range hood according to a second embodiment of the present invention;

fig. 12 is a sectional view showing a maximum torque state of the range hood according to the second embodiment of the present invention;

fig. 13 is a partial schematic view of a moment maximum state movement mechanism of a second embodiment of the range hood of the present invention;

fig. 14 is a sectional view of a second embodiment of the range hood of the present invention in an open state;

fig. 15 is a partial schematic view of an open-state movement mechanism of a range hood according to a second embodiment of the present invention;

fig. 16 is a partial schematic view of a range hood in a closed state according to a third embodiment of the present invention;

fig. 17 is a partial schematic view of the range hood according to the third embodiment of the present invention in an open 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.

Example one

Referring to fig. 1 and 2, a range hood is a side-draft range hood, and includes a housing 1, a front side of the housing 1 is open and is gradually inclined backward from top to bottom, and an upper panel 2 and a lower panel assembly 3 are respectively disposed at the open of the housing 1 and from top to bottom. The front side of the shell 1 and the position corresponding to the lower panel assembly 3 form an air inlet 11, and the air inlet 11 is arranged below the upper panel 2. The upper panel 2 and the housing 1 are fixedly disposed, and the lower panel assembly 3 is translatable and rotatable with respect to the housing 1 to open or close the intake vent 11. The casing 1 further comprises side plates 12 positioned on the left side and the right side, and a top back plate 13 arranged between the side plates 12, wherein the top back plate 13 comprises a top plate and a back plate, and the top plate and the back plate can be integrated or can be in a split structure connected together.

The range hood of the invention has a double-control switch structure. The upper panel 2 is provided with a power key 21 and display icons, for example, an annular yellow silk-screen ring 211 can be arranged around the power key 21, and in a power-off state, a user can identify the position of the power key 21 according to the silk-screen ring 211.

Referring to fig. 2, 3 and 9, the lower panel assembly 3 includes a lower panel 31, a first baffle 32, a second baffle 33 and a third baffle 34, the lower panel 31 corresponds to the air inlet 11 in shape and size, the first baffle 32 extends from the bottom of the lower panel 31 to the inside of the housing 1, the second baffle 33 has two baffles, which are respectively disposed at two sides of the first baffle 33, the third baffle 33 is connected between the rear sides of the first baffle 32 and the second baffle 33, the first baffle 32, the second baffle 33 and the third baffle 34 form a cover body with a triangular longitudinal section, and the cover body is connected and fixed with the lower panel 31 so that the lower panel assembly 3 forms a relatively closed space. The lower panel 31 is provided with function keys 35, such as an on-off key, a lamp, an air volume key, an air manager and the like. In the off state, the icon of the function key 35 is hidden. When the area in the silk-screen ring 211 is touched lightly, namely the power key 21 is touched lightly, the range hood enters a working state; at the same time, the function key 35 on the lower panel 31 lights up, and the icon of the function key 35 starts to appear. In addition, after the power key 21 of the upper panel 2 is turned on, the lower panel assembly 3 is driven by the movement mechanism to gradually move upwards and rotate, so that the air inlet 11 is opened, and the range hood enters an oil smoke suction working state. After the lower panel assembly 3 reaches the open state, the angle between the lower panel 31 and the vertical direction is 20 to 50 °, and the lower panel 31 is inclined from top to bottom gradually, which is beneficial for the user to operate the function keys 35. The lower panel 31 is inclined at a smaller angle than the upper panel 2. The specific structure and operation of the lower panel assembly 3 and its moving mechanism will be described in detail below.

When the range hood is opened and is in a working state, a certain gap is formed between the lower panel assembly 3 and the upper panel 2, the first baffle 32 of the lower panel assembly 3 gradually inclines upwards from front to back to form a flow guide structure, and oil smoke below the lower panel assembly 3 can be quickly contained in the shell 1. In order to ensure that the smoke collecting effect and the user experience are optimal, the distance between the bottom of the lower panel 31 and the wall is 340-430 mm in the installation state of the range hood installed on the wall.

A fan frame 4 is arranged above the shell 1, and a fan system (not shown) is arranged in the fan frame 4, so that the range hood with the upper fan is formed. Can set up light (not shown) in the first baffle 32 department of lower plate subassembly 3, at this regional installation light, avoided the dazzling problem that the user brought is directly penetrated to light, can also shine the whole kitchen mesa of range hood below, promote the user and cook and experience the effect.

Referring to fig. 4 to 9, in order to automatically drive the lower panel assembly 3, a moving mechanism is provided on a side of the lower panel assembly 3 facing the inside of the housing 1, and includes a support beam 371 fixed in the housing 1, a driving mechanism 372, a first hinge 373, a second hinge 374, a first link 375, and a second link 376. The support beam 371 has both ends connected to the upper panel 2 and the rear panel of the top rear panel 13 of the housing 1. The first hinge 373 is bent, preferably, in a substantially V shape with a forward opening, one end of the first hinge 373 is hinged to the front end of the support beam 371 (the hinge is the rotation center of the first hinge 373), and the other end is hinged to the lower panel 31 through the panel bracket 312, wherein the panel bracket 312 is fixedly disposed on the side of the lower panel 31 facing the inside of the housing 1. The second hinge 374 may have a long bar shape, one end of which is hinged to the support beam 371 (the hinge is the rotation center of the second hinge 374), and the other end of which is hinged to the lower panel 31 through the panel bracket 312. The connection of the first hinge 373 to the panel bracket 312 is located above the connection of the second hinge 374 to the panel bracket 312. Alternatively, the first hinge 373 and the second hinge 374 may be connected to the lower panel 31 by two separate panel brackets 312. The second link 376 is preferably in the shape of an upwardly protruding arc, and has one end hinged to the second hinge 374, e.g., at an intermediate position of the second hinge 374, and the other end hinged to one end of the first link 375, and the other end of the first link 375 is connected to an output end of the driving mechanism 372 and is driven by the driving mechanism 372 to rotate around the connection with the driving mechanism 372. Preferably, the driving mechanism 372 is a motor, and is connected to the first link 375 through an output shaft 3724 (which may also be an output shaft of the motor) of the speed reducing mechanism, for example, the first link 375 is directly sleeved on the output shaft 3724. The second hinge 374 is a drive arm, and the first hinge 373 is a driven arm. The rotation axes at which the first hinge 373, the second hinge 374, the second link 376, and the first link 375 are hinged extend in the left-right direction.

The support beam 371 can support the weight of the lower panel assembly 3, is an interface of each rod piece for controlling the motion track of the lower panel assembly 3, is connected with the top rear plate 13 and the upper panel 2 of the shell 1, enhances the rigidity of the shell 1, and improves the anti-falling capacity in the transportation process.

The two motion mechanisms are driving ends, and the motion mechanism as a driven end does not need to be provided with the driving mechanism 372, and at this time, the first connecting rod 375 of the motion mechanism is connected with the output end of the driving mechanism 372 of the other motion mechanism through the connecting shaft 377 to transmit torque, and the connecting shaft 377 extends in the left-right direction, so that the motion mechanisms on both sides of the lower panel 31 are synchronized to be smoothly opened and closed. The connecting shaft 377 is connected to the output shaft 3724 and the first link 375 at its both ends. In consideration of space, the load rotation center (the rotation center of the coupling shaft 377) is shifted to a position close to the lower panel 31 by providing the link mechanism formed by the first link 375 and the second link 376, so that the installation can be facilitated.

By arranging the first hinge 373 and the second hinge 374, the motion tracks of the upper hinge point and the lower hinge point of the lower panel 31 are respectively controlled, so that the lower panel 31 realizes the compound motion of translation and rotation. Because the double-hinge structure has large shaking amount, and the non-driving end has two movable points and cannot move synchronously, a connecting shaft 377 is added to realize the transmission of torque and increase the synchronism of the movement of the left side and the right side.

Referring to fig. 1, 4 and 6, when the lower panel assembly 3 is in the closed state, the included angle α between the first link 375 and the second link 376 approaches the angle of the dead point, and the lower panel 31 and the upper panel 2 of the lower panel assembly 3 are flush with each other to form a large plane; referring to fig. 9, the moving mechanism is opened, and the lower panel assembly 3 is first translated forward and backward and then rotated counterclockwise; referring to fig. 3 and 7, when the lower panel assembly 3 moves to the fully opened state, which is at the front side of the upper panel 2, the included angle β between the first link 375 and the second link 376 approaches the close-dead-point angle, so that the transmission efficiency can be improved. In the present embodiment, the angle between the first link 375 and the second link 376 refers to the angle between the line (chord) connecting the two ends of the second link 376 and the center line of the first link 375. The angle of the link movement determines the position of the lower panel 31 when opened and closed, and a limit shaft 3711 is provided on the support beam 371 corresponding to the position below the first link 375 for limiting the movement of the first link 375 when closed, preventing it from crossing the dead point, resulting in failure of the link mechanism. Referring to fig. 5 and 8, the end of the first link 375 connected to the second link 376 is concavely formed with a movement groove 3751 for limiting the angle of movement of the second link 376 by the depth h of the movement groove 3751 when the lower panel assembly 3 is opened.

Example two

In the above embodiment, since the lower panel 31 of the lower panel assembly 3 is usually made of glass, the weight of the lower panel assembly 3 can reach about 5.7kg, which is 2 to 3 times that of the conventional smoke barrier, the load is large during operation, the load applied to the second hinge 374 (the lower panel assembly 3) is influenced by the gravity moment and the transmission mechanism, the load varies from-2N M to 6N M (clockwise positive), and the load varies unevenly and has a directional change. These all lead to the operating process actuating mechanism 372 to generate heat easily, poor stability, and the life-span is short, and the auto-lock power requires high scheduling problem, and the load difference is big under each operating mode leads to the unable very efficient matching of driver.

Therefore, in the present embodiment, referring to fig. 10 and 11, the moving mechanism further includes a balancing device 378, and preferably, the balancing device 378 is a gas balancer (gas spring), and the second hinge 374 is hinged to the support beam 371 from an end portion thereof, instead of being hinged to the support beam 371 from an upper portion thereof. The cylinder outside of the balancing device 378 is hinged to the top of the top back plate 13 of the housing 1, and the end of the piston rod of the balancing device 378 is hinged to the top end of the second hinge 374. Thus, during movement, a certain thrust can be provided to the end of the second hinge 374, balancing the load generated by the gravitational moment during operation. Taking the clockwise direction as positive, the right-side area gravity moment of the hinge joint (the rotation center of the second hinge 374) of the second hinge 374 and the support beam 371 is positive, and the left-side area gravity moment is negative. The balancing means 378 and the connection of the lower panel assembly 3 to the second hinge 374 are located at both sides of the rotation center of the second hinge 374, respectively.

When the range hood is in the closed state, the gravity moment of the lower panel assembly 3 received by the second hinge 374 is negative, the balancing moment applied to the second hinge 374 by the balancing device 378 is positive, as shown by the arrow in fig. 11, the arrow on the left side represents the gravity moment, the arrow on the right side represents the balancing moment, and a part of the gravity moment can be offset. Referring to fig. 12 and 13, when the lower panel assembly 3 moves forward to exert the maximum moment on the second hinge 374, i.e. the gravity moment reaches the maximum, the balancing moment exerted by the balancing device 378 on the second hinge 374 is positive, as shown by the arrow on fig. 13, the arrow on the right side represents the gravity moment, and the arrow on the left side represents the balancing moment, which can counteract part of the gravity moment. Referring to fig. 14 and 15, the range hood is in the open state, when the gravity moment of the lower panel assembly 3 received by the second hinge 374 is positive, the balancing moment applied to the second hinge 374 by the balancing device 378 is negative, as shown by the arrow in fig. 15, the arrow on the right side represents the gravity moment, the arrow on the left side represents the balancing moment, and a part of the gravity moment can be counteracted.

The balancing device 378 can balance the weight moment at any position, thereby effectively reducing the maximum value of the load and the uniformity of the load distribution in the operation process, improving the operation working condition of the driving mechanism 372 and improving the stability of the movement mechanism. Moreover, in the event of a sudden power failure, the counterbalance 378 increases the self-locking force of the motion mechanism, improving the safety of the motion mechanism.

EXAMPLE III

Referring to fig. 16 and 17, the present embodiment is different from the first embodiment in that the driving mechanism 372 is an electric push rod, which can increase the self-locking force of the moving mechanism. The support beam 371 is provided with a fixing bracket 3712, and one end of the first hinge 373 is hinged to the fixing bracket 3712 above the support beam 371. The two ends of the connecting shaft 377 are rotatably connected with the upper panel 2 through bearing seats 3771 respectively. The output end of the electric push rod is connected with a third connecting rod 3723, one end of the third connecting rod 3723 is rotatably connected with the output end of the electric push rod, the other end of the third connecting rod 3723 is sleeved on the periphery of the connecting shaft 377 and fixedly connected, one end of the first connecting rod 375 is sleeved on the periphery of the connecting shaft 377 and fixedly connected, and the other end of the first connecting rod 375 is still rotatably connected with the second connecting rod 376. When the electric push rod is started, the third link 3723 drives the connecting shaft 377 to rotate, thereby driving the first link 375 to rotate. The second hinge 374, the panel bracket 312, the first hinge 373, the support beam 371, and the fixing bracket 3712 form a four-bar linkage structure, and when the second hinge 374 is driven by the second link 376, the lower panel 31 can be driven to move.

The two revolute pairs (with the first hinges) of the second link 376 may be distributed above and below the support beam 371, or may both be located above the support beam 371.

When the electric push rod drives the lower panel 31 to close, a large pulling force needs to be output, and at the moment, the top rear plate 13 is easily pulled to deform.

Claims

1. The utility model provides a range hood, includes casing (1) and activity setting at casing (1) front side's lower panel assembly (3), casing (1) front side is opened and is equipped with air intake (11), works as when lower panel assembly (3) are in the first position, air intake (11) are closed by lower panel assembly (3), works as when lower panel assembly (3) are in the second position, air intake (11) are opened lower panel assembly (3) are located casing (1) the place ahead, its characterized in that: the range hood further comprises a movement mechanism capable of driving the lower panel assembly (3) to move in a translational and rotational manner between a first position and a second position, the movement mechanism comprises a first hinge (373) and a second hinge (374), the first hinge (373) and the second hinge (374) are respectively and rotatably connected in the shell (1), the first hinge (373) and the second hinge (374) are respectively and rotatably connected with the lower panel assembly (3), the rotating shafts of the first hinge (373) and the second hinge (374) respectively extend in the left-right direction, and the movement mechanism further comprises a balancing device (378) capable of applying a thrust force to the rotating center of the first hinge (373) or the second hinge (374) in the shell (1) so as to offset the gravity moment of the lower panel assembly (3).

2. The range hood of claim 1, wherein: the joint of the first hinge (373) and the lower panel assembly (3) is positioned above the joint of the second hinge (374) and the lower panel assembly (3), the output end of the balancing device (378) is rotatably connected with the second hinge (374), and the joints of the balancing device (378) and the lower panel assembly (3) and the second hinge (374) are respectively positioned on two sides of the rotation center of the second hinge (374).

3. The range hood of claim 2, wherein: the shell (1) comprises a top back plate (13), the balancing device (378) is a gas balancer, the outer side of a cylinder body of the balancing device (378) is hinged with the top of the top back plate (13) of the shell (1), and the end of a piston rod of the balancing device (378) is hinged with the top end of the second hinge (374).

4. The range hood according to any one of claims 1 to 3, wherein: the casing (1) front side still fixedly is provided with top panel (2), air intake (11) are located top panel (2) below, the second position of lower panel assembly (3) is located the front side of top panel (2).

5. The range hood according to any one of claims 1 to 3, wherein: the movement mechanism further comprises a supporting beam (371) fixed in the shell (1), and the first hinge (373) and the second hinge (374) are respectively connected with the supporting beam (371) in a rotating mode.

6. The range hood of claim 5, wherein: casing (1) front side still fixed upper panel (2) of being provided with, casing (1) is including top back plate (13), the both ends of supporting beam (371) are connected fixedly with the back plate of top back plate (13) of upper panel (2) and casing (1) respectively.

7. The range hood according to any one of claims 1 to 3, wherein: the motion mechanism further comprises a first connecting rod (375) and a second connecting rod (376), wherein one end of the second connecting rod (376) is hinged with the second hinge (374), and the other end of the second connecting rod (376) is hinged with one end of the first connecting rod (375).

8. The range hood of claim 7, wherein: the motion mechanism is provided with two motion mechanisms, wherein one motion mechanism is a driving end, the other motion mechanism is a driven end, the motion mechanism serving as the driving end further comprises a driving mechanism (372) used for driving a first connecting rod (375) to rotate, a connecting shaft (377) enabling the driven end and the driving end to be synchronous is connected between an output end of the driving mechanism (372) and the first connecting rod (375) of the motion mechanism at the driven end, and the connecting shaft (377) extends in the left-right direction.

9. The range hood of claim 8, wherein: the drive mechanism (372) is a motor, and an output shaft of the motor is directly or indirectly connected with the first connecting rod (375) through a speed reducing mechanism.

10. The range hood of claim 8, wherein: the driving mechanism (372) is an electric push rod, the movement mechanism further comprises a third connecting rod (3723), one end of the third connecting rod (3723) is rotatably connected with the output end of the electric push rod, the other end of the third connecting rod is sleeved on the periphery of the connecting shaft (377) and fixedly connected, one end of the first connecting rod (375) is sleeved on the periphery of the connecting shaft (377) and fixedly connected, and the other end of the first connecting rod is rotatably connected with the second connecting rod (376).