CN216557274U - Fume exhaust fan - Google Patents

Abstract

The utility model discloses a range hood, which comprises a smoke collecting hood, wherein the bottom of the smoke collecting hood is provided with an air inlet, the air inlet is provided with a smoke baffle plate capable of opening and closing the air inlet, the range hood further comprises a first motion mechanism for driving the smoke baffle plate to overturn relative to the smoke collecting hood, the range hood further comprises a second motion mechanism for driving the smoke baffle plate to overturn relative to the smoke collecting hood, the first motion mechanism and the second motion mechanism are respectively arranged on two sides of the smoke baffle plate in the length direction, the first motion mechanism and the second motion mechanism both comprise a first driving mechanism, and the first driving mechanism of the second motion mechanism only can output the force for closing the smoke baffle plate when the smoke baffle plate is closed. Compared with the prior art, the utility model has the advantages that: set up the main drive on one side of keeping off the cigarette board, another sets up auxiliary drive to can keep off the cigarette board and close in the supplementary cigarette board that keeps off of transmission moment when keeping off the cigarette board and close, make both sides can both closely be closed.

Description

Fume exhaust fan

Technical Field

The utility model 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. Generally, the range hood comprises a top suction type range hood and a side suction type range hood, and the top suction type range hood has more and more extensive application due to the advantages of neatness, lightness, small occupied space and the like. The top-suction type range hood generally includes a fume collecting hood, a fan housing located on the fume collecting hood, and a volute, an impeller, and a motor for driving the impeller are installed in the fan housing.

The existing top-suction type range hood is higher in hanging height, generally has a complex smoke collecting cavity body in order to ensure the oil smoke suction effect, for example, a smoke collecting hood assembly and a range hood disclosed in the Chinese patent with the application number of 202110514970.3, and relates to the technical field of kitchen appliances, the smoke collecting hood assembly comprises a smoke collecting hood, a smoke inlet of the smoke collecting hood is provided with a baffle, the baffle is movably connected to the smoke collecting hood or detachably connected to the smoke collecting hood, and the baffle divides the smoke inlet of the smoke collecting hood into a first air inlet and a second air inlet; the first air inlet can be dismantled and be connected with first filter screen, and the second air inlet can be dismantled and be connected with the second filter screen. The range hood with the form has more smoke collection cavity corners, complex appearance and poor cleanness.

In addition, a pure flat top suction type range hood without a cavity is provided, but the range hood has a fume suction effect which cannot adapt to the use environment of a Chinese kitchen. The ceiling-mounted range hood disclosed in chinese patent application No. 202011335153.3, comprising: the smoke collecting cover is provided with a smoke collecting cavity, and the bottom of the smoke collecting cavity is provided with a smoke inlet; the smoke collecting plate covers the oil smoke inlet and can be turned out towards the lower front; and a control panel which is hidden in the front end area of the bottom of the smoke collection cavity and can be turned out downwards.

Moreover, the range hood has larger smoke collecting plate and longer length, and the smoke collecting plate is hung upside down when being closed, so that the gravity causes the opened moment of the smoke collecting plate to be larger. If adopt traditional both sides pivot unilateral drive scheme, the drive end is closed back, and the driven end can lead to holding together cigarette board and organism of driven side to have the clearance about 5mm because of the whole deformation of mechanism, directly influences complete machine outward appearance. If both sides all adopt traditional motor drive scheme, the corner synchronism requirement to both sides motor is higher, to other use scenes that require synchronization, generally uses step motor in the household electrical appliances trade, but the step motor output torque that the volume is suitable can't satisfy the requirement of this model (big glass, long distance arm of force, shutdown closing torque is more than 2 N.M), and its control part is complicated, and is with high costs. And the stepping motor may be out of step when the load changes in the use process, and serious faults such as distortion of the smoke collecting plate, deformation of the glass back plate and the like can be caused in the machine.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to provide a range hood aiming at the defects in the prior art, wherein two sides of a smoke baffle plate in the length direction can be tightly closed.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a range hood, includes the collection petticoat pipe, the air intake has been seted up to the bottom of collection petticoat pipe, air intake department is provided with the cigarette board that keeps off that can open and close the air intake, range hood is still including being used for the drive to keep off the first motion of the relative collection petticoat pipe upset of cigarette board, its characterized in that: the range hood still includes the second motion that is used for the drive to keep off the relative collection petticoat pipe upset of cigarette board, first motion and second motion set up the both sides on the length direction who keeps off the cigarette board respectively, first motion and second motion all include first actuating mechanism, the first actuating mechanism of second motion only can be when keeping off the cigarette board and close the power of closing the cigarette board.

Preferably, do not export when opening the cigarette board for realizing the second motion, export when closing the cigarette board, first motion and second motion still all include first drive mechanism, first actuating mechanism is connected with the transmission of cigarette board through first drive mechanism, be provided with first one-way drive structure between the output of the first actuating mechanism of second motion and the input of corresponding first drive mechanism and only can act on the cigarette board when closing the cigarette board.

Preferably, the unidirectional driving adopts a ratchet wheel, the first unidirectional driving structure comprises a first ratchet wheel and a first elastic sheet, the first driving mechanism of the second moving mechanism is provided with a first output shaft as an output end, the first ratchet wheel is fixedly sleeved on the periphery of the first output shaft, the first elastic sheet is fixedly connected with the input end of the first transmission mechanism, and the first elastic sheet and the first ratchet wheel are matched to enable the first ratchet wheel to push the first elastic sheet when rotating in one direction only so as to transmit the output of the first driving mechanism to the first transmission mechanism.

Preferably, for the output of actuating mechanism transmits to keeping off the cigarette board for being convenient for, first drive mechanism includes first drive swing arm, execution swing arm and the first connecting rod as the input, first motion and second motion still all are including the mount pad that is used for installing first actuating mechanism, first output shaft rotates with the mount pad to be connected, first drive swing arm is connected fixedly with first output shaft, first drive swing arm still is connected with execution swing arm through first connecting rod, be the rotation between first drive swing arm and the first connecting rod and between first connecting rod and the execution swing arm and be connected, execution swing arm still rotates with the mount pad to be connected.

Furthermore, in order to facilitate the opening of the smoke baffle plate, the second movement mechanism further comprises a second driving mechanism, the second driving mechanism is in transmission connection with the smoke baffle plate through a second transmission mechanism, and a second one-way driving structure is arranged between the output end of the second driving mechanism and the input end of the corresponding second transmission mechanism and can only output the force for opening the smoke baffle plate when the smoke baffle plate is opened.

Preferably, the unidirectional driving is performed by adopting a ratchet wheel, the second unidirectional driving structure comprises a second ratchet wheel and a second elastic sheet, the second driving mechanism is provided with a second output shaft serving as an output end, the second ratchet wheel is fixedly sleeved on the periphery of the second output shaft, the second elastic sheet is fixedly connected with the input end of the first transmission mechanism, and the second elastic sheet and the second ratchet wheel are matched to enable the second ratchet wheel to push the second elastic sheet when rotating only in one direction, so that the output of the second driving mechanism is transmitted to the second transmission mechanism.

Preferably, for the output of actuating mechanism transmits to keeping off the cigarette board for being convenient for, second drive mechanism includes second drive swing arm, execution swing arm and the second connecting rod as the input, first motion and second motion still all are including the mount pad that is used for installing first actuating mechanism, second drive mechanism also installs on the mount pad, the second output shaft rotates with the mount pad to be connected, second drive swing arm is connected fixedly with second output shaft, second drive swing arm still is connected with execution swing arm through the second connecting rod, be rotation between second drive swing arm and the second connecting rod and between second connecting rod and the execution swing arm and be connected, execution swing arm still rotates with the mount pad to be connected.

Gather together the cigarette and improve the oil absorption cigarette effect when starting for being convenient for, and be convenient for clean when shutting down, the collection petticoat pipe is including the bottom plate that is located the bottom, the air intake is seted up on the bottom plate, the preceding tip border of air intake is located behind the preceding tip of bottom plate, and when keeping off the cigarette board and being in the closed condition, keep off the bottom plate of cigarette board and collection petticoat pipe and flush.

Compared with the prior art, the utility model has the advantages that: the main drive is arranged on one side of the smoke baffle, and the auxiliary drive is arranged on the other side of the smoke baffle, so that torque can be transmitted to assist the smoke baffle to be closed when the smoke baffle is closed, and both sides of the smoke baffle can be closed tightly; by additionally arranging the opening auxiliary drive, the opening of the smoke baffle can be assisted when the smoke baffle is opened; the bottom of the smoke collecting hood is flush, so that smoke leakage can be avoided when the gas cooker is started, and the gas cooker is easy to clean when the gas cooker is shut down; the direct current motors are adopted on the two sides, so that large-torque driving can be performed; the requirement on the stability of the rotating speed of the driving mechanism is low, the requirement that the auxiliary driving is larger than the rotating speed of the main driving is met, and the normal operation of the movement mechanism can be ensured.

Drawings

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

fig. 2 is a schematic view (closed state) of a part of a smoke collecting hood, a moving assembly and a smoke baffle of the range hood of the first embodiment of the present invention;

fig. 3 is a sectional view (closed state) of a hidden fan frame of the range hood according to the first embodiment of the present invention;

fig. 4 is a schematic view (closed state) of the moving components and the smoke baffle of the range hood according to the first embodiment of the present invention;

fig. 5 is a schematic view (closed state) of a first moving mechanism of a moving assembly of the range hood according to the first embodiment of the present invention;

fig. 6 is a schematic view (closed state) of a second movement mechanism of the movement assembly of the extractor hood according to the first embodiment of the present invention;

fig. 7 is a partial schematic view (closed state) of a second movement mechanism of the movement assembly of the range hood according to the first embodiment of the present invention;

fig. 8 is a schematic view of the open state of the range hood according to the first embodiment of the present invention;

fig. 9 is a sectional view (opened state) of a hidden fan frame of the range hood according to the first embodiment of the present invention;

fig. 10 is a schematic view (open state) of the moving components and the smoke barrier of the range hood according to the first embodiment of the present invention;

fig. 11 is a schematic view (open state) of the first moving mechanism of the moving assembly of the extractor hood according to the first embodiment of the present invention;

fig. 12 is a schematic view (open state) of the second movement mechanism of the movement assembly of the extractor hood according to the first embodiment of the present invention;

fig. 13 is a partial schematic view (opened state) of the second moving mechanism of the moving assembly of the extractor hood according to the first embodiment of the present invention;

fig. 14 is a schematic view of a moving assembly of a range hood according to a second embodiment of the present invention;

fig. 15 is a schematic view (different from the view in fig. 12) of a moving component of a range hood according to a second embodiment of the present invention;

fig. 16 is a sectional view of a moving assembly 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.

Example one

Referring to fig. 1 to 3, 8 and 9, 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, and a fan system (not shown) is disposed in the fan frame 2.

The smoke collecting hood 1 comprises a bottom plate 11 located at the bottom, an air inlet 12 is formed in the bottom plate 11, the edge of the front end of the air inlet 12 is located behind the front end of the bottom plate 11, and the air inlet 12 is communicated with fluid in the fan frame 2.

The air inlet 12 is provided with a smoke baffle 3, the front end part of the smoke baffle 3 is rotatably connected with the smoke collecting hood 1, and the rear end part of the smoke baffle 3 is a free end. When the range hood does not work, the smoke baffle 3 is in a closed state, and the air inlet 12 is closed at the moment; when the range hood needs to work, the smoke baffle 3 is turned forwards, so that the air inlet 12 is opened. When the smoke barrier 3 is in a closed state, it is flush with the bottom plate 11 of the smoke collecting hood 1, thereby constituting a pure flat structure.

A filter screen 4 is arranged above the air inlet 12 in the smoke collecting hood 1, the filter screen 4 is preferably a grid screen, an oil cup 5 is arranged below the rear side of the smoke collecting hood 1, and the filter screen 4 is inclined downwards gradually from front to back, so that oil dropping on the filter screen 4 can be guided into the oil cup 5. A grid net can also be arranged at the joint of the smoke collecting cover 1 and the wind frame 2.

The smoke collecting hood 1 of the utility model cancels a complex smoke collecting cavity, adopts a simple grid air inlet mode in a starting working state, and has a pure flat structure at the bottom in a shutdown non-working state. Combine to keep off cigarette board 3, realized the start and do not run the cigarette, shut down easy cleanness.

In order to drive the smoke baffle 3 to rotate, the range hood further comprises a movement assembly, the movement assembly comprises a first movement mechanism and a second movement mechanism which are arranged on the left side and the right side in the smoke collecting cover 1, and the first movement mechanism and the second movement mechanism respectively comprise a first driving mechanism 61, a first driving swing arm 62 and an execution swing arm 63. Referring to fig. 4 to 7, and fig. 10 to 13, wherein the first driving mechanism 61 is a rotary driving mechanism having a first output shaft 611 as an output end of the first driving mechanism 61 extending in the left-right direction, the first driving mechanism 61 is preferably a dc motor. The first motion mechanism and the second motion mechanism further each include a mounting seat 64 for mounting the first drive mechanism 61, and the first output shaft 611 is rotatably connected with the mounting seat 64. The first driving swing arm 62 is fixedly connected with the first output shaft 611, in addition, the first driving swing arm 62 is further connected with the executing swing arm 63 through a first connecting rod 65, the first driving swing arm 62 and the first connecting rod 65, the first connecting rod 65 and the executing swing arm 63 are rotatably connected, the executing swing arm 63 is further rotatably connected with the mounting base 64, and the rotating axis of each rotating connection part extends in the left-right direction. The execution swing arm 63 is further connected and fixed with the smoke baffle 3 towards one side in the smoke collecting hood 1, preferably indirectly connected, provided with a smoke baffle bracket as commonly used, and connected through the smoke baffle bracket. Therefore, the first movement mechanism and the second movement mechanism are respectively connected with the left side and the right side of the smoke baffle plate 3 (two sides of the smoke baffle plate 3 in the length direction) to ensure that the left side and the right side are tightly closed.

The first motion mechanism is used as a main driving part, and therefore, the first driving mechanism 61 is started to directly drive the first driving swing arm 62 to rotate, and then the first connecting rod 65 drives the executing swing arm 63 to rotate, so as to drive the smoke baffle 3 to rotate. The mount 64 may form a limit for the first drive swing arm 62, such as a protrusion or the like provided on the mount 64 in the path of rotation of the first drive swing arm 62.

The second movement mechanism serves as an auxiliary drive member. The second motion mechanism further includes a first ratchet wheel 66 and a first elastic sheet 67, wherein the first ratchet wheel 66 is fixedly sleeved on the outer periphery of the first output shaft 611. The first elastic sheet 67 and the first ratchet wheel 66 are adjacently arranged, in this embodiment, the first elastic sheet 67 is in the form of an elastic sheet, the first elastic sheet 67 is fixedly connected with the first driving swing arm 62, and the end, far away from the connection with the first driving swing arm 62, of the first elastic sheet 67 extends to the first ratchet wheel 66 to be kept in contact with the first ratchet wheel. By arranging the first ratchet wheel 66, the first driving mechanism 61 only can enable the first driving swing arm 62 to rotate towards a determined direction (the direction for driving the smoke baffle 3 to close), in this case, the first elastic sheet 67 is pushed by the first ratchet wheel 66, and then force is transmitted to the first driving arm 62; when the first driving mechanism 61 rotates the first driving swing arm 62 in the other opposite direction (the direction in which the smoke barrier 3 is driven to open), the first ratchet 66 idles, i.e. cannot push the first elastic sheet 67.

The first driving swing arm 62, the executing swing arm 63 and the first connecting rod 65 form a first transmission mechanism, alternatively, the first transmission mechanism may also adopt other existing mechanisms, as long as the first elastic sheet 67 is fixedly connected with the input end of the first transmission mechanism, and the output end of the first transmission mechanism is fixedly connected with the smoke baffle 3. The first ratchet 66 and the first elastic sheet 67 form a first one-way driving structure, and alternatively, other one-way driving structures in the prior art, such as a one-way clutch, may also be adopted.

The control method of the range hood comprises the following steps:

1) judging whether the smoke baffle 3 needs to be driven, if so, entering the step 2);

2) if the smoke baffle 3 needs to be driven to open, the step 2.1) is carried out; if the smoke baffle 3 needs to be driven to close, the step 2.2) is carried out;

2.1) the first driving mechanism 61 of the first motion mechanism acts in the direction of driving the smoke barrier 3 to open at the rotating speed omega, and the first driving mechanism 61 of the second motion mechanism also acts in the direction of driving the smoke barrier 3 to open at the rotating speed 2 omega, at this time, the first motion mechanism drives the smoke barrier 3 to open, and the first ratchet wheel 66 of the second motion mechanism idles; until the smoke baffle 3 is opened in place;

2.2) the first driving mechanism 61 of the first moving mechanism moves along the direction of driving the smoke baffle 3 to close at the rotating speed ω, the first driving mechanism 61 of the second moving mechanism is not started until the first driving mechanism 61 of the first moving mechanism rotates to the complete closing position of the smoke baffle 3, the corresponding side (the right side shown in fig. 1) of the smoke baffle 3 is tightly closed and stops, the first driving mechanism 61 of the second moving mechanism moves along the direction of driving the smoke baffle 3 to close at the rotating speed 2 ω until the first driving swing arm 62 of the second moving mechanism reaches the limit position, and the corresponding side (the left side shown in fig. 1) of the smoke baffle 3 is tightly closed.

Through the structure and the control logic thereof, the effect of the first motion mechanism when the smoke baffle 3 is opened is realized, the effect of the second motion mechanism is avoided, and the smoke baffle 3 is normally opened; when the cigarette blocking plate 3 is closed, the first motion mechanism plays a main role, the second motion mechanism plays an auxiliary role, and the left side and the right side of the cigarette blocking plate 3 can be tightly closed.

Further, in the above-described steps, it is only necessary to rotate the first drive mechanism 61 of the second motion mechanism at the rotation speed ω₂The rotation speed ω of the first drive mechanism 61 larger than the first movement mechanism₁That is, it is not necessarily twice as fast.

Example two

Referring to fig. 14 to 16, in the present embodiment, the difference from the first embodiment is that the second moving mechanism has two driving mechanisms, that is, in addition to the first driving mechanism 61, the second driving mechanism 68 is further included, wherein the transmission relationship between the first driving mechanism 61 and the smoke barrier 3 is as in the first embodiment, the second driving mechanism 68 is mounted on the mounting seat 64, the second driving mechanism 68 has a second output shaft 681 as an output end of the second driving mechanism 68, extends in the left-right direction, and is rotatably connected with the mounting seat 64, and the preferred second driving mechanism 68 is a dc motor. A second driving swing arm 69 is fixedly connected to the second output shaft 681, the second driving swing arm 69 is further connected to the executing swing arm 63 through a second connecting rod 70, the second driving swing arm 69 and the second connecting rod 70, and the second connecting rod 70 and the executing swing arm 63 are rotatably connected, the executing swing arm 63 is further rotatably connected to the mounting base 64, and the rotation axes of the rotation joints extend in the left-right direction. The execution swing arm 63 is further connected and fixed with the smoke baffle 3 towards one side in the smoke collecting hood 1, preferably indirectly connected, provided with a smoke baffle bracket as commonly used, and connected through the smoke baffle bracket.

The first drive swing arm 62, the first link 65, and the execution swing arm 63, the second drive swing arm 69, and the second link 70 thus constitute two sets of three-link mechanisms.

The second motion mechanism further includes a second ratchet 72 fixedly sleeved on the second output shaft 681 and a second elastic piece 73 engaged with the second ratchet 72. The matching mode of the second ratchet wheel 72 and the second elastic sheet 73 is the same as the matching mode of the first ratchet wheel 66 and the first elastic sheet 67.

The first ratchet wheel 66 on the first output shaft 611 and the second ratchet wheel 72 on the second output shaft 681 are installed in opposite directions, ensuring that one of the drive mechanisms outputs a force to open the smoke barrier 3 and the other drive mechanism outputs a force to close the smoke barrier 3. In the present embodiment, the first drive mechanism 61 outputs a force to close the smoke barrier 3, and the second drive mechanism 68 outputs a force to open the smoke barrier 3.

The second driving swing arm 69, the second connecting rod 70 and the executing swing arm 63 form a second transmission mechanism, i.e. the first transmission mechanism and the second transmission mechanism share the same executing swing arm 63. Alternatively, the second transmission mechanism may also adopt other existing mechanisms, as long as the second elastic sheet 73 is fixedly connected with the input end of the second transmission mechanism, and the output end of the second transmission mechanism is fixedly connected with the smoke barrier 3. The second ratchet 72 and the second elastic sheet 73 form a second one-way driving structure, and alternatively, other one-way driving structures in the prior art, such as a one-way clutch, may also be adopted.

The control method of the range hood comprises the following steps:

1) judging whether the smoke baffle 3 needs to be driven, if so, entering the step 2);

2) if the smoke baffle 3 needs to be driven to open, the step 2.1) is carried out; if the smoke baffle 3 needs to be driven to close, the step 2.2) is carried out;

2.1) the first driving mechanism 61 of the first motion mechanism acts in the direction of driving the smoke barrier 3 to open at the rotation speed ω, the first driving mechanism 61 of the second motion mechanism also acts in the direction of driving the smoke barrier 3 to open at the rotation speed 2 ω, and the second driving mechanism 68 of the second motion mechanism is not started; when the smoke barrier 3 is completely opened, the first driving mechanism 61 of the first moving mechanism stops, the first driving mechanism 61 which is started by the second moving mechanism still keeps rotating at the rotating speed 2 omega along the opening direction of the smoke barrier 3, the second driving mechanism 68 of the second moving mechanism starts rotating at the rotating speed omega along the opening direction of the smoke barrier 3, the corresponding second driving swing arm 69 is driven by the second ratchet wheel 72, and after the left side of the smoke barrier 3 is opened in place, the two driving mechanisms of the second moving mechanism stop and are opened completely;

2.2) when the smoke baffle 3 needs to be driven to close, the first driving mechanism 61 of the first movement mechanism moves along the direction of driving the smoke baffle 3 to close at the rotating speed omega, the first driving mechanism 61 of the second movement mechanism is not started, the second driving mechanism 68 moves along the direction of driving the smoke baffle 3 to close at the rotating speed 2 omega, at this time, the first movement mechanism drives the smoke baffle 3 to close, and the two swing arms of the second movement mechanism both idle on the corresponding ratchet wheels; when the first driving mechanism 61 of the first movement mechanism rotates to the full-closed position of the smoke barrier 3, the corresponding side (the right side shown in fig. 1) of the smoke barrier 3 is tightly closed and stops, the second driving mechanism 68 still acts at the rotation speed 2 ω in the direction of driving the smoke barrier 3 to close, the first driving mechanism 61 of the second movement mechanism starts to act at the rotation speed ω in the direction of driving the smoke barrier 3 to close, the first driving swing arm 62 is driven by the first ratchet wheel 66, and the first driving mechanism assists in tightly closing the corresponding side (the left side shown in fig. 1) of the smoke barrier 3; then, both driving mechanisms of the second movement mechanism are stopped, and the closing is completed.

Under the control logic, the first drive mechanism 61 and the second drive mechanism 68 of the second motion mechanism have two gear positions of ω and 2 ω, which ensure that the two gear positions are bothWhen the driving mechanism rotates simultaneously, the speed difference ensures that at most one of the two ratchet wheels transmits torque. Alternatively, the two gears may not be in a double speed relationship. I.e. the first drive mechanism 61 of the first movement mechanism has a rotational speed of omega₁The first drive mechanism 61 and the second drive mechanism 68 each have a rotational speed ω₁And ω₂And satisfy ω₂＞ω₁。

Claims (8)

1. The utility model provides a range hood, includes collection petticoat pipe (1), air intake (12) have been seted up to the bottom of collection petticoat pipe (1), air intake (12) department is provided with and keeps off cigarette board (3) that can open and close air intake (12), range hood is still including being used for the drive to keep off the first motion of cigarette board (3) relative collection petticoat pipe (1) upset, its characterized in that: range hood still including being used for the drive to keep off the second motion that cigarette board (3) collected fume hood (1) overturns relatively, first motion and second motion set up the both sides on the length direction who keeps off cigarette board (3) respectively, first motion and second motion all include first actuating mechanism (61), first actuating mechanism (61) of second motion only can be when keeping off cigarette board (3) and close the power that keeps off cigarette board (3) in the output.

2. The range hood of claim 1, wherein: first motion and second motion still all include first drive mechanism, first actuating mechanism (61) are connected through first drive mechanism and fender cigarette board (3) transmission, be provided with first one-way drive structure between the output of the first actuating mechanism (61) of second motion and corresponding first drive mechanism's the input and only can act on when keeping off cigarette board (3) and close and keep off cigarette board (3).

3. The range hood of claim 2, wherein: the first one-way driving structure comprises a first ratchet wheel (66) and a first elastic sheet (67), a first driving mechanism (61) of the second moving mechanism is provided with a first output shaft (611) serving as an output end, the first ratchet wheel (66) is fixedly sleeved on the periphery of the first output shaft (611), the first elastic sheet (67) is fixedly connected with the input end of the first transmission mechanism, and the first elastic sheet (67) is matched with the first ratchet wheel (66) to enable the first ratchet wheel (66) to push the first elastic sheet (67) when the first ratchet wheel (66) rotates only in one direction, so that the output of the first driving mechanism (61) is transmitted to the first transmission mechanism.

4. The range hood of claim 3, wherein: the first transmission mechanism comprises a first driving swing arm (62), an executing swing arm (63) and a first connecting rod (65) which serve as input ends, the first movement mechanism and the second movement mechanism further comprise a mounting seat (64) used for mounting the first driving mechanism (61), the first output shaft (611) is rotatably connected with the mounting seat (64), the first driving swing arm (62) is fixedly connected with the first output shaft (611), the first driving swing arm (62) is further connected with the executing swing arm (63) through the first connecting rod (65), the first driving swing arm (62) is rotatably connected with the first connecting rod (65) and the first connecting rod (65) is rotatably connected with the executing swing arm (63), and the executing swing arm (63) is further rotatably connected with the mounting seat (64).

5. The range hood of claim 1, wherein: the second motion mechanism further comprises a second driving mechanism (68), the second driving mechanism (68) is in transmission connection with the smoke baffle plate (3) through a second transmission mechanism, a second one-way driving structure is arranged between the output end of the second driving mechanism (68) and the input end of the corresponding second transmission mechanism, and the force for opening the smoke baffle plate (3) can be output only when the smoke baffle plate (3) is opened.

6. The range hood of claim 5, wherein: the second one-way driving structure comprises a second ratchet wheel (72) and a second elastic piece (73), the second driving mechanism (68) is provided with a second output shaft (681) serving as an output end, the second ratchet wheel (72) is fixedly sleeved on the periphery of the second output shaft (681), the second elastic piece (73) is fixedly connected with the input end of the first transmission mechanism, and the second elastic piece (73) is matched with the second ratchet wheel (72) to enable the second ratchet wheel (72) to push the second elastic piece (73) when rotating only in one direction, so that the output of the second driving mechanism (68) is transmitted to the second transmission mechanism.

7. The range hood of claim 6, wherein: the second transmission mechanism comprises a second driving swing arm (69) serving as an input end, an executing swing arm (63) and a second connecting rod (70), the first movement mechanism and the second movement mechanism further comprise a mounting seat (64) used for mounting the first driving mechanism (61), the second driving mechanism (68) is also mounted on the mounting seat (64), a second output shaft (681) is rotatably connected with the mounting seat (64), the second driving swing arm (69) is fixedly connected with the second output shaft (681), the second driving swing arm (69) is further connected with the executing swing arm (63) through the second connecting rod (70), the second driving swing arm (69) and the second connecting rod (70) are rotatably connected, and the executing swing arm (63) is further rotatably connected with the mounting seat (64).

8. The range hood according to any one of claims 1 to 7, wherein: collection petticoat pipe (1) is including bottom plate (11) that are located the bottom, air intake (12) are seted up on bottom plate (11), after the preceding tip border of air intake (12) is located the preceding tip of bottom plate (11), when keeping off cigarette board (3) and being in the closed condition, keep off cigarette board (3) and flush with bottom plate (11) of collection petticoat pipe (1).

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