CN216079949U - Fume exhaust fan - Google Patents

Abstract

The utility model discloses a range hood, which comprises a smoke collecting hood, a fan frame arranged above the smoke collecting hood, and a fan system arranged in the fan frame, wherein an air inlet is formed in the smoke collecting hood, a smoke guide plate is arranged below the air inlet, the range hood also comprises a motion mechanism for driving the smoke guide plate to lift, the motion mechanism comprises a lifting mechanism and a transmission rod driven by the lifting mechanism to lift, the lifting mechanism comprises a four-bar mechanism and a limiting connecting rod mechanism for limiting the motion trail of the four-bar mechanism, and the transmission rod is fixedly connected with the smoke guide plate and can drive the smoke guide plate to lift. Compared with the prior art, the utility model has the advantages that: through setting up many link mechanism, form the linear motion orbit after the rotation is connected to need not the guide rail direction, the vice structure of pure rotation connection, severe environment influence such as the fearless oil smoke, long service life, the precision is high, can realize about adjusting the amount of wind or the air inlet area comes the adaptation culinary art condition along with the operating mode change.

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

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

Therefore, a smoke guide plate is generally arranged below an air inlet of the top-suction range hood to form an annular suction structure, and the oil smoke suction effect is improved by utilizing the coanda effect. The top suction type range hood with the smoke guide plate disclosed in the chinese patent with the application number of 201410419676.4 comprises a body, a smoke collecting hood and the smoke guide plate, wherein the smoke collecting hood is connected with the body, a fan is arranged in the body, an air inlet is arranged on the smoke collecting hood, the smoke guide plate is arranged right opposite to the air inlet of the smoke collecting hood and fixed on the smoke collecting hood through a bracket or a buckle, and a distance exists between the smoke guide plate and the smoke collecting hood to form a smoke channel.

Because the range hood adopting the smoke guide plate does not drip oil and has better oil smoke absorption effect, the range hood has more and more extensive application in recent years. The existing range hood adopting the smoke guide plate often has the following disadvantages:

1. when the traditional smoke guide plate range hood is used on a common double stove, the difference between the smoke quantity generated by the quick-frying side and the soup cooking side is large, so that the air quantity or the area of an air inlet cannot be adjusted to adapt to the cooking condition;

2. some range hoods are also provided with lifting smoke guide plates, as disclosed in chinese patent application No. 201811419513.0, although the whole air inlet is lifted and lowered with the size of the oil smoke, the whole air inlet mainly adopts a lifting structure similar to an electric push rod and a guide rail, if the whole air inlet is exposed in an oil path environment, grease can be lost due to oil dirt accumulated on the guide rail and the push rod, or the grease can be stuck due to the accumulated dirt, which easily causes a failure; and the part is with the external product with the fan frame outside of electric putter or guide rail, and the mechanism is external can lead to the product volume grow, and then influences that the form is pleasing to the eye or lead to unable cladding in the cupboard.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to provide the range hood aiming at the defects in the prior art, the service life of the range hood can be prolonged, and the position of the smoke guide plate can be more accurately adjusted to adapt to the cooking condition.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a range hood, includes collection petticoat pipe, sets up in the fan frame of collection petticoat pipe top and sets up the fan system in the fan frame, the air intake has been seted up on the collection petticoat pipe, the below of air intake is provided with leads the cigarette board, range hood is still including being used for driving this motion that leads the cigarette board and go up and down, its characterized in that: the motion mechanism comprises a lifting mechanism and a transmission rod driven by the lifting mechanism to lift, the lifting mechanism comprises a four-bar mechanism and a limiting link mechanism used for limiting the motion trail of the four-bar mechanism, and the transmission rod is fixedly connected with the smoke guide plate and can drive the smoke guide plate to lift.

Preferably, in order to facilitate the link mechanism to output the lifting linear motion, the lifting mechanism includes a first link, a second link, a third link, a fourth link, a fifth link, a sixth link and a seventh link, each link having a first end and a second end opposite to each other; the fan frame comprises a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a fifth connecting rod and a seventh connecting rod, wherein the first ends of the first connecting rod, the second connecting rod and the third connecting rod are rotatably connected together, the second end of the second connecting rod is rotatably connected with the inner side of the fan frame, the joint of the second end of the second connecting rod and the second end of the second connecting rod is the rotation center of the second connecting rod, the second end of the first connecting rod is rotatably connected with the first ends of the fourth connecting rod and the sixth connecting rod, the second end of the third connecting rod is rotatably connected with the first ends of the fifth connecting rod and the seventh connecting rod, the second ends of the fourth connecting rod and the fifth connecting rod are rotatably connected with the inner side of the fan frame, the joint of the fourth connecting rod and the fifth connecting rod is the rotation center of the fourth connecting rod and the fifth connecting rod, the second end of the sixth connecting rod is also rotatably connected with the transmission rod; the first connecting rod, the third connecting rod, the sixth connecting rod and the seventh connecting rod form a four-bar mechanism, and the second connecting rod, the fourth connecting rod and the fifth connecting rod form a limiting connecting rod mechanism.

For the convenience of connection of the movement mechanism and the fan frame, the second end of the second connecting rod is connected through an installation support, the installation support is fixedly connected with the fan frame, and the second connecting rod is rotatably connected with the installation support.

In order to facilitate the connection of the movement mechanism and the fan frame, the second ends of the fourth connecting rod and the fifth connecting rod are respectively and rotatably connected with the mounting support.

Preferably, the installing support is fixed on the left side or the right side in the fan frame and corresponds to the corresponding smoke guide plate, the first connecting rod, the second connecting rod and the third connecting rod all extend forwards from a common joint, the joint of the second connecting rod and the installing support is located on the rear side of the joint of the fourth connecting rod and the installing support, and the rotating shaft of each connecting rod extends in the left-right direction.

Preferably, the first link, the second link, and the third link are connected at the same position and rotate around the same center, the fourth link and the fifth link are connected at the same position and rotate around the same rotation center, the first link, the fourth link, and the sixth link are connected at the same position and rotate around the same center, and the third link, the fifth link, and the seventh link are connected at the same position and rotate around the same center.

In order to ensure that the transmission rod does lifting motion, the center of the joint of the first connecting rod, the second connecting rod and the third connecting rod is Q, the rotation center of the second connecting rod is P, the rotation center of the joint of the fourth connecting rod and the fifth connecting rod is O, the center of the joint of the first connecting rod, the fourth connecting rod and the sixth connecting rod is B, the center of the joint of the third connecting rod, the fifth connecting rod and the seventh connecting rod is C, the center of the joint of the sixth connecting rod, the seventh connecting rod and the transmission rod is A, the points are on the same plane, OP is a fixed line segment, the linear motion distance of the point A is L, and the line segments between the points meet the following relations: BQ ═ CQ, BQ/L ∈ [0.3,0.7], BO ═ CO, BO/L ∈ [0.2,0.5], AB ═ AC, AB/L ∈ [0.6,0.9], PQ/L ∈ [0.1,0.3 ].

In order to improve the torsion resistance of the transmission rod by utilizing the separation of the output ends of the two sets of multi-link mechanisms and simultaneously reduce the material requirements of the transmission rod and the rotary connecting part, the transmission rod extends longitudinally, and the lifting mechanism is provided with two sets which are arranged at intervals up and down.

The air quantity or the air inlet area are adjusted to adapt to the cooking condition under the working conditions of the left side and the right side, the smoke guide plates are arranged at left and right intervals, and each smoke guide plate is provided with an independent movement mechanism.

Compared with the prior art, the utility model has the advantages that: by arranging the multi-connecting-rod mechanism, a linear motion track is formed after the multi-connecting-rod mechanism is rotationally connected, so that guide rails are not needed for guiding, the structure of a pure rotational connection pair is free from the influence of severe environments such as oil smoke and the like, the service life is long, and the precision is high; the two groups of multi-link mechanisms are arranged, so that the torsion of a longer transmission rod can be resisted, and the material requirements of the transmission rod and a rotary connecting part are reduced; through setting up two smoke deflector, can realize that the left and right sides adjusts the amount of wind or the air inlet area comes the adaptation culinary art condition along with the operating mode change, promote the oil absorption cigarette effect.

Drawings

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

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

fig. 3 is a schematic view of a left smoke guide plate and a movement mechanism thereof of the range hood of fig. 1;

fig. 4 is a schematic view of the range hood in the second state according to the embodiment of the present invention;

fig. 5 is a schematic view of a left smoke guide plate and a movement mechanism thereof of the range hood of fig. 4;

fig. 6 is a schematic view of the range hood in the third state according to the embodiment of the present invention;

fig. 7 is a schematic view of a left smoke guide plate and a movement mechanism thereof of the extractor hood of fig. 6;

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

fig. 9 is a flowchart of a control method of the range hood according to the 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 3, 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 3 is disposed in the fan frame 2. The smoke collecting cover 1 is provided with an air inlet 11, so that the oil smoke can enter the fan frame 2 from the air inlet 11 in the upward rising process and is discharged by the fan system 3. The bottom of the fume collecting hood 1 is upwards sunken to form a fume collecting cavity 12, and the air inlet 11 is positioned at the top of the fume collecting cavity 12.

The lower part of the air inlet 11 is provided with a smoke guide plate 5, and as in the prior art, the oil smoke enters the inside of the fan frame 2 through the air inlet 11 from the channel between the periphery of the smoke guide plate 5 and the smoke collection cover 1.

The two smoke guide plates 5 are arranged in parallel left and right, and the two smoke guide plates 5 are arranged at intervals and correspond to the air inlet 11. Each smoke guide 5 has a corresponding moving mechanism to drive the corresponding smoke guide 5 to ascend and descend, whereby the two smoke guides 5 can ascend and descend independently. The moving mechanisms of the two smoke guide plates 5 are symmetrically arranged and independently move in the same way.

The motion mechanism adopts a double multi-link mechanism, each group of multi-link mechanisms comprises a first connecting rod 61, a second connecting rod 62, a third connecting rod 63, a fourth connecting rod 64, a fifth connecting rod 65, a sixth connecting rod 66 and a seventh connecting rod 67, each connecting rod is respectively provided with a first end and a second end which are opposite, the connecting rods form the seven-link mechanism, and the connecting rods are connected in a rotating way to form the lifting mechanism. The movement mechanism further comprises a transmission rod 68, the transmission rod 68 extending in a longitudinal direction, preferably in a vertical direction.

The first ends of the first link 61, the second link 62 and the third link 63 are rotatably connected together and preferably rotatably connected at the same position, wherein the second end of the second link 62 is rotatably connected with the inner side of the fan frame 2, and can be directly connected with the fan frame 2, or as shown in this embodiment, the second link 62 is rotatably connected with the mounting support 69, the mounting support 69 is fixedly connected with the left side (the moving mechanism of the left smoke guide plate 5) or the right side (the moving mechanism of the right smoke guide plate 5) of the fan frame 2, the second link 62 is rotatably connected with the mounting support 70, the connection position of the second link 62 and the fan frame 2 is the rotation center thereof, and the first link 61, the second link 62 and the third link 63 all extend forward from the common connection position.

The second end of the first link 61 is rotatably connected to the first ends of the fourth link 64 and the sixth link 66, the second end of the third link 63 is rotatably connected to the first ends of the fifth link 65 and the seventh link 67, the second ends of the fourth link 64 and the fifth link 65 are rotatably connected together, preferably rotatably connected to the inner side of the fan frame 2 at the same position, and can be directly connected to the fan frame 2 or connected to the mounting support 69, and the connection point of the second link 62 and the mounting support 69 is located at the rear side of the connection point of the fourth link 64 and the mounting support 69. The second end of the sixth link 66 is pivotally connected to the transmission rod 68, and the second end of the seventh link 67 is also pivotally connected to the transmission rod 68. preferably, the sixth link 66 and the seventh link 67 are connected to the transmission rod 68 at the same position so as to be pivotable about the same center.

The fourth connecting rod 64, the fifth connecting rod 65 and the mounting support 69 are connected at the same position, and the connection position is the rotation center of the fourth connecting rod 64 and the fifth connecting rod 65; the first link 61, the fourth link 64, and the sixth link 66 are preferably connected at the same position to rotate about the same center, and the third link 63, the fifth link 65, and the seventh link 67 are preferably connected at the same position to rotate about the same center. Preferably, the rotational connection is achieved by means of pins or the like. The rotating shafts of the connecting rods extend in the left-right direction.

The first link 61, the third link 63, the sixth link 66 and the seventh link 67 thus constitute a four-link mechanism, and the second link 62, the fourth link 64 and the fifth link 65 constitute a limit link mechanism. The above embodiment shows a connection mode of seven connecting rods, alternatively, other connection modes (connection between different connecting rods or connection between a connecting rod and a fan frame) or the number of connecting rods can be adopted to form the limiting connecting rod mechanism, as long as the output end (the end connected with the transmission rod) of the four-connecting rod mechanism is ensured to move linearly.

The ratio of the links is adjusted to ensure that the driving rod 69 moves up and down in the vertical direction. Referring to fig. 3, the common connection center of the first link 61, the second link 62 and the third link 63 is Q, the rotation center of the second link 62 is P, the common rotation center of the fourth link 64 and the fifth link 65 is O, the common connection center of the first link 61, the fourth link 64 and the sixth link 66 is B, the common connection center of the third link 63, the fifth link 65 and the seventh link 67 is C, and the common connection center of the sixth link 66, the seventh link 67 and the transmission rod 68 is a, which are located on the same plane, wherein OP is a fixed line segment, the distance at which the point a can move in a nearly straight line is L, and the reference L (L is a value required by design) is 120mm in this embodiment. The line segment between the points satisfies the following conditions: CQ ═ CQ, BQ/L ∈ [0.3,0.7], with 0.583 being preferred in this example; BO ═ CO, BO/L ∈ [0.2,0.5], with 0.383 preferred in this example; AB ═ AC, AB/L ∈ [0.6,0.9], with 0.733 being preferred in this example; PQ/L is ∈ [0.1,0.3], which is 0.21 in this example; OP/L. epsilon. [0.1,0.2], and preferably 0.156 in this embodiment. Under the constraint, the motion track of the point A is a straight line, and the motion path of the transmission rod 68 can be defined without a guide rail.

The lower end of the driving rod 68 is fixedly connected with the upper surface of the smoke guide plate 5, so that when the driving rod 68 is lifted, the smoke guide plate 5 can be driven to lift. Due to the long rod body of the transmission rod 68, i.e. the long transmission distance, a large bending moment may be formed during the connection of the transmission rod 68 at point a to the smoke deflector 5, which requires a high material requirement for the hinge at the connection of the transmission rod 68 and the rotation. For this reason, in the present embodiment, two sets of multi-link mechanisms are provided, and are arranged at intervals up and down. This makes it possible, on the one hand, to increase the torsional resistance of the design by separating the two sets of a-points of the multi-bar linkage, and, on the other hand, to reduce the material requirements for the transmission rod 68 and the joint.

In addition, adopt pin joint or articulated to be the pure rotation connection pair between each connecting rod, the adverse circumstances influence such as the oil smoke of fearless promotes motion reliability and precision, reduces the jam that lubricated loss or dirty accumulation lead to, and long service life, the precision height does not have the ball fit clearance of similar guide rail to lead to the cigarette board 5 and rocks about.

The motion mechanism further includes a driving mechanism, which is a rotation driving mechanism (not shown), such as a motor, and the output end of the rotation driving mechanism is directly or indirectly connected to the point P, so as to drive the second link 62 to rotate, the rotation of the second link 62 can drive the first link 61 and the third link 63 to rotate, thereby driving the sixth link 66 and the seventh link 67 to rotate, so as to raise and lower the point a, the fourth link 64 defines the motion track of the sixth link 66, and the fifth link 65 defines the motion track of the seventh link 67. The driving mechanism may be a linear driving mechanism, and may be connected to the second link 62 and may be connected between both ends of the second link 62.

In fig. 1, the two smoke guide plates 5 are in an initial state. Referring to fig. 4 and 5, when the smoke deflector 5 on the left side needs to be moved up to a position corresponding to the position where the air inlet 11 is closed, the driving mechanism drives the second link 62 to rotate clockwise around the rotation center, so that the position where the sixth link 66 and the seventh link 67 are connected together is raised, and the smoke deflector 5 is raised by the driving lever 68.

Referring to fig. 6 and 7, when the smoke guide plate 5 needs to be lowered, the driving mechanism drives the second link 62 to rotate counterclockwise around the rotation center, so that the position where the sixth link 66 and the seventh link 67 are commonly connected is lowered, and the smoke guide plate 5 is driven to be lowered through the transmission rod 68. Under the culinary art state of left surface unilateral stir-fry, the height that the left side smoke deflector 5 descends is greater than the height that the right side smoke deflector 5 descends, and the right side smoke deflector 5 department only has partial gap air inlet, and negative pressure is whole to leak for a short time, and the main oil absorption cigarette passageway that smoke deflector 5 in the main air inlet region formed between leading flank and left surface and collection petticoat pipe can combine modes such as infrared temperature sensing or smoke stove linkage to conveniently realize automatically regulated passageway size.

Referring to fig. 8, the two smoke guide plates 5 are both in the lowest position, and are adapted to the working condition of large smoke on both sides, and are opened fully from left to right, and the smoke is rapidly sucked away by matching with the maximum air quantity gear.

Under the condition that the flow of a fan system is not changed, the flow of a main suction inlet is ensured at the stir-frying side under the design, so that high-concentration oil smoke is quickly sucked away, the front large opening design effectively avoids the situation that large oil smoke is spread to the upper face when directly impacting an oil guide plate, the ascending front oil smoke is quickly sucked away, and left and right oil smoke is normally sucked away by being drawn into the flanging edge after continuing a section of boundary through the coanda principle of the bottom of the oil guide plate.

The two smoke guide plates 5 which can be independently adjusted are respectively arranged on the left side and the right side, the two smoke guide plates 5 can be lifted to different positions (the positions can be automatically set) to adapt to different cooking conditions, and the size of an opening channel of the smoke guide plate is automatically adjusted according to different gears or air volumes selected by a user to ensure the negative pressure area or the air inlet speed of a suction inlet around the smoke guide plate. Combine modes such as infrared temperature sensing etc. or cigarette kitchen linkage to realize when the unilateral explodes the stir-fry side, explode stir-fry side guide smoke panel 5 part and open or open entirely, guarantee that the flow and the negative pressure of main sunction inlet concentrate, and close part or close entirely in one side in addition for it reduces the flow area who corresponds, increase this side relative resistance, and then reduce pressure release and flow distribution proportion, make the ordinary range hood who does not set up two guide smoke panels 5 in the oil smoke effect ratio under with the amount of wind have obvious promotion.

The range hood provided by the utility model has the following control method that the position sensor can be arranged on the point E or the transmission rod 68 and used in combination with the left and right double oil smoke sensors, the range hood has no power or current detection feedback, and the two oil smoke sensors can be respectively arranged at the bottoms of the left and right sides of the smoke collecting cover 1. Referring to fig. 9, the method specifically includes the following steps:

1) starting the range hood and operating in a default gear;

2) reading information of the oil smoke sensors, including information of a left oil smoke sensor a and information of a right oil smoke sensor b, and obtaining the current left oil smoke concentration and the current right oil smoke concentration;

3) comparing whether the oil smoke concentration detected by the current oil smoke sensor is obviously different, and correspondingly controlling according to the comparison result, wherein m1 represents a preset difference lower limit value, m2 represents a preset difference upper limit value, ya represents an oil smoke concentration value on the left side, and yb represents an oil smoke concentration value on the right side:

3.1) if

Indicates that the oil concentrations on both sides are larger and smaller, but the difference is smaller according to

And

the descending position of the smoke guide plate 5 is determined by the size and the relative proportion of the smoke guide plate 5, preferably, the descending position can be determined by a table look-up mode, the data stored in the table is empirical values or experimental values, and the standard for adjusting the position of the smoke guide plate 5 is that the side with high oil smoke concentration is fully opened, namely, the smoke guide plate is descended to the lowest position, and then the step 4) is carried out;

3.2) if

And considering that the oil smoke concentrations at the two sides are not different, taking the oil smoke concentration value with larger value as yd, comparing the value with a preset oil smoke concentration threshold value y1, and correspondingly controlling according to the comparison result:

3.2.1) if yd is less than or equal to y1, judging the small oil smoke scenes on the left side and the right side, and entering the step 4);

3.2.2) if yd is more than y1, judging the scene is a large oil smoke scene with almost the same left side and right side, and entering the step 4);

3.3) if

Judging that the oil smoke concentrations on the two sides are greatly different, comparing the magnitudes of ya and yb, and correspondingly controlling according to the comparison result:

3.3.1) if ya is more than yb, controlling the right smoke guide plate 5 to be in the highest position to close the corresponding side air inlet channel, and descending the left smoke guide plate 5 to work;

3.3.2) if yb is more than ya, controlling the left smoke guide plate 5 to be in the highest position to close the corresponding side air inlet channel, and descending the right smoke guide plate 5 to work;

4) acquiring corresponding current position information through a first position sensor and a second position sensor which respectively correspond to each smoke guide plate 5;

5) judging whether the position is matched with the current cooking scene, if so, returning to the step 2), otherwise, driving the smoke guide plate 5 to a corresponding state by the driving mechanism, and after waiting for the time interval delta ta, returning to the step 4).

Claims (9)

1. The utility model provides a range hood, includes collection petticoat pipe (1), sets up fan frame (2) and fan system (3) of setting in fan frame (2) in collection petticoat pipe (1) top, air intake (11) have been seted up on collection petticoat pipe (1), the below of air intake (11) is provided with leads cigarette board (5), range hood is still including being used for driving this motion that leads cigarette board (5) and go up and down, its characterized in that: the motion mechanism comprises a lifting mechanism and a transmission rod (68) driven by the lifting mechanism to lift, the lifting mechanism comprises a four-bar mechanism and a limiting link mechanism used for limiting the motion trail of the four-bar mechanism, and the transmission rod (68) is fixedly connected with the smoke guide plate (5) and can drive the smoke guide plate (5) to lift.

2. The range hood of claim 1, wherein: the lifting mechanism comprises a first connecting rod (61), a second connecting rod (62), a third connecting rod (63), a fourth connecting rod (64), a fifth connecting rod (65), a sixth connecting rod (66) and a seventh connecting rod (67), wherein each connecting rod is provided with a first end and a second end which are opposite; the first ends of the first connecting rod (61), the second connecting rod (62) and the third connecting rod (63) are connected together in a rotating way, the second end of the second connecting rod (62) is rotatably connected with the inner side of the fan frame (2) and the joint is the rotating center of the second connecting rod (62), the second end of the first connecting rod (61) is respectively connected with the first ends of a fourth connecting rod (64) and a sixth connecting rod (66) in a rotating way, the second end of the third connecting rod (63) is respectively connected with the first ends of a fifth connecting rod (65) and a seventh connecting rod (67) in a rotating way, the second ends of the fourth connecting rod (64) and the fifth connecting rod (65) are respectively and rotatably connected with the inner side of the fan frame (2) and the connection positions are respectively the rotating centers of the fourth connecting rod (64) and the fifth connecting rod (65), the second end of the sixth connecting rod (66) is rotationally connected with the transmission rod (68), and the second end of the seventh connecting rod (67) is also rotationally connected with the transmission rod (68); the first connecting rod (61), the third connecting rod (63), the sixth connecting rod (66) and the seventh connecting rod (67) form a four-bar linkage, and the second connecting rod (62), the fourth connecting rod (64) and the fifth connecting rod (65) form a limiting connecting rod mechanism.

3. The range hood of claim 2, wherein: the second end of the second connecting rod (62) is connected through arranging a mounting support (69), the mounting support (69) is fixedly connected with the fan frame (2), and the second connecting rod (62) is rotatably connected with the mounting support (69).

4. The range hood of claim 3, wherein: the second ends of the fourth connecting rod (64) and the fifth connecting rod (65) are respectively connected with a mounting support (69) in a rotating mode.

5. The range hood of claim 4, wherein: the smoke guiding device is characterized in that the mounting support (69) is fixed on the left side or the right side in the fan frame (2) and corresponds to the corresponding smoke guiding plate (5), the first connecting rod (61), the second connecting rod (62) and the third connecting rod (63) extend forwards from a common joint, the joint of the second connecting rod (62) and the mounting support (69) is located on the rear side of the joint of the fourth connecting rod (64) and the mounting support (69), and rotating shafts of the connecting rods extend in the left-right direction.

6. The range hood of claim 2, wherein: the first connecting rod (61), the second connecting rod (62) and the third connecting rod (63) are connected at the same position and rotate around the same center, the fourth connecting rod (64) and the fifth connecting rod (65) are connected at the same position and rotate around the same rotating center, the first connecting rod (61), the fourth connecting rod (64) and the sixth connecting rod (66) are connected at the same position and rotate around the same center, and the third connecting rod (63), the fifth connecting rod (65) and the seventh connecting rod (67) are connected at the same position and rotate around the same center.

7. The range hood of claim 6, wherein: the center of the joint of the first connecting rod (61), the second connecting rod (62) and the third connecting rod (63) is Q, the rotation center of the second connecting rod (62) is P, the rotation center of the joint of the fourth connecting rod (64) and the fifth connecting rod (65) is O, the center of the joint of the first connecting rod (61), the fourth connecting rod (64) and the sixth connecting rod (66) is B, the center of the joint of the third connecting rod (63), the fifth connecting rod (65) and the seventh connecting rod (67) is C, the center of the joint of the sixth connecting rod (66), the seventh connecting rod (67) and the transmission rod (68) is A, all the points are on the same plane, OP is a fixed line segment, the linear motion distance of the point A is L, and the line segments between all the points meet the following relations that: BQ ═ CQ, BQ/L ∈ [0.3,0.7], BO ═ CO, BO/L ∈ [0.2,0.5], AB ═ AC, AB/L ∈ [0.6,0.9], PQ/L ∈ [0.1,0.3 ].

8. The range hood according to any one of claims 1 to 7, wherein: the transmission rods (68) extend longitudinally, and the lifting mechanism is provided with two groups which are arranged at intervals up and down.

9. The range hood according to any one of claims 1 to 7, wherein: the smoke guide plates (5) are arranged at left and right intervals, and each smoke guide plate (5) is provided with an independent movement mechanism.

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