CN216079976U - Fume exhaust fan - Google Patents

Abstract

The utility model relates to a range hood, comprising: the fan system is arranged in the shell, the lower part of the shell is provided with a vertically extending smoke inlet cavity, and the smoke inlet cavity is provided with an air inlet; the smoke inlet cavity comprises a fixed cavity and a movable cavity which is positioned below the fixed cavity and communicated with the fixed cavity, the air inlet is arranged on the bottom wall and/or the rear side wall of the movable cavity, and the movable cavity is connected below the fixed cavity in a manner of being capable of deflecting back and forth relative to the fixed cavity and at least has a first state and a second state; in the first state, the movable cavity extends downwards from the fixed cavity, so that the smoke inlet cavity is vertically arranged on the whole; in the second state, the movable cavity deflects forwards relative to the fixed cavity and inclines forwards from top to bottom. The range hood not only can ensure that the smoke inlet is arranged below the smoke inlet to ensure the smoke suction effect, but also can avoid the interference problem with a pot on a cooking bench.

Description

Fume exhaust fan

Technical Field

The utility model relates to the technical field of kitchen appliances, in particular to a range hood.

Background

The range hood is a kitchen appliance for purifying the kitchen environment. The common and widely used range hood is the top suction type range hood and the near suction type range hood.

In order to ensure the smoking effect, the front and back width sizes of the smoke baffle of the top-suction range hood are too large and generally protrude out of the cabinet, so that the head of a user is easy to collide with the smoke baffle in the using process. In addition, the ceiling type range hood has a high hanging height (a high smoke inlet), oil smoke is easily influenced by cross wind and is easy to escape, and the ceiling type range hood is far away from a smoke source and cannot suck away the oil smoke in time, so that the smoke suction effect is poor. The hanging height of the near-suction range hood is relatively low, a user easily collides with the range hood when a frying pan is turned over and fried in the using process, the user experience is poor, the size of the near-suction range hood is too large, the lower end occupies more kitchen space, the kitchen is inconvenient to clean, the oil smoke is easy to diffuse forwards, the phenomenon of positive escape of the range hood is avoided, and the smoke suction effect is poor.

Therefore, chinese utility model patent with application number CN202020066610.2 (No. CN211822584U) discloses a range hood, including the casing and locate the fan system in this casing, the casing lower part has the smoke inlet chamber of vertical extension, opens the smoke inlet that is linked together with this smoke inlet chamber on the preceding lateral wall of casing lower part, and along the top edge of smoke inlet is provided with the cigarette board that keeps off that extends forward horizontally or aslope, thereby this front side position that keeps off the cigarette board still has the extension board that can change the cigarette board width by this cigarette board front and back telescopic movement of keeping off relatively.

Although the range hood in the above-mentioned patent makes into the smoke inlet through downwardly extending's slim smoke inlet chamber and leans on lower setting, is closer to the flue gas source, still need set up the fender cigarette board that can overturn forward and open and improve the oil absorption cigarette effect, because the smoke inlet chamber leans on lower setting, and is close to the top of a kitchen range, so there is to keep off the cigarette board upset and open the in-process and the pan (especially the high pot) interference problem on the top of a kitchen range, also blocks user's culinary art field of vision easily, has influenced user's use and has experienced.

Therefore, the existing range hood needs to be further improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of the prior art and provides a range hood which can ensure the oil smoke suction effect by arranging a smoke inlet below and can avoid the interference problem with a pot on a cooking bench.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a range hood, comprising:

the fan system is arranged in the shell, the lower part of the shell is provided with a vertically extending smoke inlet cavity, and the smoke inlet cavity is provided with an air inlet;

the smoke inlet cavity comprises a fixed cavity and a movable cavity which is positioned below the fixed cavity and communicated with the fixed cavity, the air inlet is arranged on the bottom wall and/or the rear side wall of the movable cavity, and the movable cavity is connected below the fixed cavity in a manner of being capable of deflecting back and forth relative to the fixed cavity and at least has a first state and a second state;

in the first state, the movable cavity extends downwards from the fixed cavity, so that the smoke inlet cavity is vertically arranged on the whole;

in the second state, the movable cavity deflects forwards relative to the fixed cavity and inclines forwards from top to bottom.

In order to improve the oil smoke absorption effect, the air inlet comprises a main air inlet arranged on the rear side wall of the movable cavity and an auxiliary air inlet positioned on the bottom wall of the movable cavity. The main air inlet is arranged on the rear side wall of the movable cavity, the auxiliary air inlet is arranged on the bottom wall of the movable cavity, the distance between the air inlet and the cooking bench can be reduced, the smoke inlet is close to the oil smoke generation point, and the oil smoke is not easy to escape, so that the smoke absorption effect of the range hood can be improved; on the other hand, the air inlet is arranged below, and the radiation noise at the air inlet is far lower than the ears of a user, so that the sound quality of the whole machine is better; through setting up main air inlet slope, can enlarge the negative pressure scope of air inlet department to avoid the oil smoke to escape from range hood's rear side, further promote the smoking effect. In addition, the auxiliary air inlet on the bottom wall of the movable cavity can also correspond to the position facing the smoke source, and the strong suction and exhaust effect is ensured.

In order to realize the filtration to the oil smoke in air intake department, main air intake includes vertical extension and along the first fresh air inlet of left and right direction interval distribution, supplementary air intake is including extending around, and along the second fresh air inlet of left and right direction interval distribution. It is conceivable that the main air inlet is not limited to the first air inlet holes in the distribution state, and the auxiliary air inlet is not limited to the second air inlet holes in the distribution state, and other strip-shaped holes, central holes or elliptical hole structures may be adopted.

In order to realize the nimble deflection of activity cavity to guarantee the leakproofness of activity cavity and fixed cavity junction, avoid appearing the oil smoke escape here, the upper portion of activity cavity with the lower part of fixed cavity is passed through the flexible piece and is connected, still be equipped with the deflection motion mechanism in the fixed cavity, this deflection motion mechanism includes driving piece and swinging arms, this swinging arms with the power take off end transmission of driving piece is connected, thereby can take place the swing in the front and back direction, the swinging arms can act on in the swing in-process forward the activity cavity, make the activity cavity is in flexible piece department is buckled and is deflected forward.

In order to ensure that the movable cavity can be stably ensured to be in a vertically arranged first state and avoid the problem of shaking, the swinging rod is vertically placed in the front-back swinging process and used for blocking the movable cavity to deflect backwards so as to limit the movable cavity to be in the first state.

The deflection motion mechanism can adopt various prior arts such as a gear transmission mechanism and a connecting rod transmission mechanism which can act on the movable cavity to deflect, in order to simplify the structure of the deflection motion mechanism and match with the movable cavity, the deflection motion mechanism further comprises a transmission shaft which extends along the left direction and the right direction of the fixed cavity, the transmission shaft is rotatably arranged on the inner wall of the fixed cavity by taking the axis of the transmission shaft as a rotation center, the driving part is a first motor, the output shaft of the first motor is in transmission connection with the transmission shaft, the first end of the oscillating rod is connected to the transmission shaft and can oscillate back and forth under the driving of the transmission shaft, and the second end of the oscillating rod can abut against the front side wall of the movable cavity in the forward oscillation process.

In order to ensure the stability of the movable cavity in the deflection process, two oscillating rods are arranged at intervals along the length direction of the transmission shaft.

In order to reduce the problem of oil smoke escaping at the front side of the oil smoke inlet cavity, the oil smoke exhaust device further comprises an oil smoke isolating screen, wherein the oil smoke isolating screen is arranged on the front side wall of the movable cavity in a sliding and adjustable mode, and is provided with an unfolding state of sliding downwards to extend out of the bottom wall of the movable cavity and a folding state of sliding upwards to be folded on the front side wall of the movable cavity.

In order to realize the flexible action of smoke barrier, still include linear motion mechanism, this linear motion mechanism includes fixing base, second motor, lead screw, slider, the fixing base is located on the preceding lateral wall of activity cavity, the lead screw rotates to be located on the fixing base to extend along upper and lower direction, the second motor with lead screw transmission is connected, the slider slides the restraint and is in on the lead screw, smoke barrier locates on the slider.

In order to better match with the actual cooking working condition and realize the automatic action of the smoke isolating screen, the smoke isolating screen further comprises an oil smoke concentration sensor arranged on the smoke inlet cavity, and the oil smoke concentration sensor is electrically connected to a control system of the range hood, so that the control system can control the second motor to act according to the received signal of the oil smoke concentration sensor.

Compared with the prior art, the utility model has the advantages that: the movable cavity of the smoke inlet cavity of the range hood can deflect forwards, so that the air inlet of the movable cavity can be closer to the smoke source position, powerful suction and exhaust are realized, the movable cavity which is forwards inclined from top to bottom increases the negative pressure area in the front-back direction of the range hood, the oil smoke can be effectively prevented from escaping from the front side and the back side of the range hood, and the smoking effect is further improved. On the other hand, compared with the structure that the lower part of the front side wall of the smoke inlet cavity is provided with the air inlet in the prior art, the air inlet on the movable cavity of the range hood can be designed to be relatively leaned on, a smoke baffle plate which turns from bottom to top is not needed to be arranged, and the movable cavity is not easy to interfere with a pot on a cooking bench after being deflected forwards, so that the use experience of a user is effectively improved.

Drawings

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

FIG. 2 is a left side view of a range hood in accordance with an embodiment of the present invention;

fig. 3 is a vertical sectional view (left side view angle, movable cavity in forward deflection state) of the extractor hood according to the embodiment of the present invention along the front-rear direction;

fig. 4 is a vertical cross-sectional view (left side view angle, movable cavity in vertical arrangement) of the range hood according to the embodiment of the present invention along the front-rear direction;

fig. 5 is a vertical sectional perspective view of the range hood according to the embodiment of the present invention along the front-rear direction (the movable cavity is in a forward deflected state);

fig. 6 is a front perspective view of the range hood according to the embodiment of the present invention (the movable cavity is in a vertical arrangement state);

fig. 7 is a schematic perspective view of the back surface of the range hood according to the embodiment of the present invention (the movable cavity is in a forward deflection state);

FIG. 8 is a schematic perspective view of a yaw motion mechanism according to an embodiment of the present invention;

FIG. 9 is a schematic perspective view of a linear motion mechanism according to an embodiment of the present invention;

fig. 10 is a schematic perspective view of the back of the linear motion mechanism according to the embodiment of the present invention.

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

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 10, a range hood includes a housing 10 and a fan system, wherein an upper portion of the housing 10 can be used for accommodating the fan system, a lower portion of the housing 10 has a vertically extending smoke inlet cavity 20, and the smoke inlet cavity 20 has an air inlet.

Fig. 1 shows a schematic perspective view of the range hood of this embodiment, and it can be seen that the casing 10 is a square body as a whole, and the size (i.e. depth) in the front-back direction is relatively large, so as to facilitate the placement of the fan system. The smoke inlet cavity 20 is also square, but the size of the smoke inlet cavity 20 in the front-back direction is smaller than that of the casing 10 in the front-back direction, and the size of the smoke inlet cavity in the left-right direction is larger than that of the casing in the left-right direction, i.e. the range hood in this embodiment has a relatively small volume, and the smoke inlet cavity 20 can be arranged close to a wall.

With reference to fig. 1, the smoke inlet cavity 20 of the present embodiment includes a fixed cavity 21 and a movable cavity 22 located below the fixed cavity 21 and communicated with the fixed cavity 21. Wherein, a control panel convenient for the user to operate can be arranged on the front side wall of the fixed cavity 21. The movable cavity 22 is connected below the fixed cavity 21 in a manner of being capable of deflecting back and forth relative to the fixed cavity 21, specifically, the upper portion of the movable cavity 22 is connected with the lower portion of the fixed cavity 21 through a flexible member 23, wherein the flexible member 23 may be a plastic member or a rubber member capable of bending and deforming. Specifically, the flexible member 23 is an annular wall structure, an upper side of the flexible member 23 is hermetically connected with a lower side of the fixed cavity 21, and a lower side of the flexible member 23 is hermetically connected with an upper side of the movable cavity 22, so as to prevent the oil smoke from escaping from the flexible member 23.

The movable chamber 22 has at least a first state and a second state during forward and backward deflection relative to the fixed chamber 21. In the first state, the movable cavity 22 extends downward from the fixed cavity 21, so that the smoke inlet cavity 20 is vertically arranged as a whole, which is the shutdown state of the range hood. In this state, the casing 10 and the smoke inlet cavity 20 of the range hood are designed to be close to the wall, so that the phenomenon that the traditional smoke baffle of the range hood blocks the view is avoided, particularly, the smoke inlet cavity 20 is of a large flat plate structure in the closed state, the appearance is extremely simple, the aesthetic requirements of the public are met, and the detailed description is shown in fig. 4. In the second state, the movable cavity 22 deflects forward relative to the fixed cavity 21 and tilts forward from top to bottom, wherein an included angle between the movable caliper body and the vertical plane is α, α is greater than or equal to 10 ° and less than or equal to 75 °, preferably 45 °, which is shown in fig. 2 in detail, and fig. 2 is a left side view of the range hood.

The movable chamber 22 of the present embodiment has an air inlet, and specifically, the air inlet may be disposed on the bottom wall and/or the rear side wall of the movable chamber 22. Referring to fig. 7, fig. 7 is a schematic perspective view of the back of the range hood of this embodiment, wherein the movable cavity 22 is in a forward deflection state, and it can be seen that the air inlet includes a main air inlet 221 disposed on the rear side wall of the movable cavity 22 and an auxiliary air inlet 222 disposed on the bottom wall of the movable cavity 22. The main air inlet 221 includes first air inlet holes 2210 extending vertically and spaced apart from each other in the left-right direction, and the auxiliary air inlet 222 includes second air inlet holes 2220 extending back and forth and spaced apart from each other in the left-right direction.

The main air inlet 221 is arranged on the rear side wall of the movable cavity 22, the auxiliary air inlet 222 is arranged on the bottom wall, the distance between the air inlet and the cooking bench can be reduced, the smoke inlet is close to the oil smoke generation point, the oil smoke is not easy to escape, and therefore the smoke absorption effect of the range hood can be improved; on the other hand, the air inlet is arranged below, and the radiation noise at the air inlet is far lower than the ears of a user, so that the sound quality of the whole machine is better; through setting up the slope of main air inlet 221, can enlarge the negative pressure scope of air inlet department to avoid the oil smoke to escape from range hood's rear side, further promote the smoking effect. In addition, the auxiliary air inlet 222 on the bottom wall of the movable cavity 22 can also face the smoke source correspondingly, so that the strong suction and exhaust effect is ensured.

With continued reference to fig. 1, a smoke barrier 24 is further disposed on the movable chamber 22, and the smoke barrier 24 is slidably and adjustably disposed on a front side wall of the movable chamber 22 and driven by a linear motion mechanism 40. Driven by the linear motion mechanism 40, the smoke barrier 24 has an expanded state in which it slides downward to extend out of the bottom wall of the movable chamber 22 and a collapsed state in which it slides upward to collapse on the front side wall of the movable chamber 22. In the shutdown state, that is, when the movable cavity 22 is in the first state (vertical setting), the smoke barrier 24 can be adjusted to the retracted state, so as to improve the overall aesthetic property of the range hood. In the operating state, that is, when the movable chamber 22 is in the second state (inclined forward from top to bottom), especially when the amount of oil smoke is large, the smoke barrier 24 can be adjusted to the unfolded state, so that the escape of the oil smoke at the front side is effectively reduced.

Fig. 9 and fig. 10 are schematic perspective views of two different angles of the linear motion mechanism 40 of this embodiment, the linear motion mechanism 40 includes a fixed seat 41, a second motor 42, a lead screw 43, and a slider 44, the fixed seat 41 is integrally in a bar-shaped plate shape and is disposed on a front side wall of the movable cavity 22, the lead screw 43 is rotatably disposed on the fixed seat 41 and extends in an up-down direction, and two ends of the lead screw 43 can be supported on the fixed seat 41 through bearings. The second motor 42 is in transmission connection with the lead screw 43, so that the electric lead screw 43 can rotate around the axis thereof. The slide block 44 is slidably constrained on the lead screw 43, and specifically, the lead screw 43 is disposed through the slide block 44 and is in transmission connection with the slide block 44. The slide grooves 45 are formed in two side edges of the fixed seat 41 in the length direction, the left side and the right side of the slide block 44 are provided with opposite bending parts, and the steel balls 46 are clamped into the slide grooves 45, so that the slide block 44 is limited and restrained in the two slide grooves 45 of the fixed seat 41, namely, a ball slide rail structure is formed between the slide block 44 and the fixed seat 41. Referring to fig. 1, two linear motion mechanisms 40 are provided and spaced apart from each other in the left-right direction of the movable chamber 22, wherein the smoke barrier 24 is attachable to the corresponding slider 44 of the two linear motion mechanisms 40.

Referring to fig. 2 and 4, a smoke concentration sensor 50 for detecting the size of indoor smoke is disposed on the smoke inlet cavity 20, wherein the smoke concentration sensor 50 is disposed on the bottom wall of the movable cavity 22, and the smoke concentration sensor 50 is electrically connected to a control system of the range hood, so that the control system can control the second motor 42 to operate according to a received signal of the smoke concentration sensor 50. For example, in the operation process of the range hood, when the oil smoke concentration sensor 50 detects that the amount of oil smoke is relatively large, a signal is sent to the control system, and at this time, the second motor 42 acts to drive the smoke baffle to extend forwards, so that the smoke gathering area is increased, and the escape of the oil smoke at the front side is reduced. When the smoke concentration sensor 50 detects that the amount of smoke is reduced, the second motor 42 can drive the smoke barrier to retract. It can be thought that the distance that the smoke barrier extends forward can be divided into three or more gears according to the oil smoke signal that oil smoke concentration sensor 50 detected to realize the multistage regulation of smoke barrier, the different culinary art states of adaptation.

Fig. 5 is a vertical cross-sectional perspective view of the range hood of this embodiment along the front-rear direction, a deflection moving mechanism 30 is disposed in the fixed cavity 21, and the front-rear deflection adjustment of the movable cavity 22 is driven by the deflection moving mechanism 30.

Referring to fig. 6, fig. 6 is a front perspective view of the extractor hood according to the embodiment, and the deflecting motion mechanism 30 includes a driving member, a first gear 33, a second gear 34, a transmission shaft 32, and a swing rod 35. The transmission shaft 32 extends along the left and right direction of the fixed cavity 21 and is rotatably disposed on the inner wall of the fixed cavity 21 with its own axis as a rotation center, specifically, the left and right ends of the transmission shaft 32 are connected to the inner wall of the rear side wall of the fixed cavity 21 through the mounting seats 36, and the two mounting seats 36 may be provided with bearings for supporting the two ends of the transmission shaft 32. The driving member of this embodiment is a first motor 31, a first gear 33 is coaxially connected to an output shaft of the first motor 31, a second gear 34 is coaxially connected to a transmission shaft 32, the first gear 33 is engaged with the second gear 34, and when the first motor 31 rotates (rotates in a forward direction or in a reverse direction), the transmission shaft 32 can be driven to rotate by the gears. The swing lever 35 of this embodiment has two and is provided at intervals along the length of the transmission shaft 32. The first end of each oscillating rod 35 is fixedly connected to the transmission shaft 32 and can oscillate back and forth under the driving of the transmission shaft 32, and the second end of the oscillating rod 35 can abut against the front side wall of the movable cavity 22 in the forward oscillation process of the oscillating rod 35, so that the movable cavity 22 is driven to bend and deflect forward at the flexible part 23.

Referring to fig. 3 and 4, the components of the yaw movement mechanism 30 in fig. 3 and 4 are shown in a perspective view. When the range hood is turned off, the first motor 31 drives the oscillating rod 35 to be reset to the vertical placement state, and therefore, the movable cavity 22 is also reset to the initial state under the action of self gravity, that is, the movable cavity and the fixed cavity 21 above the movable cavity form a vertical large flat plate structure. The swing lever 35 has a vertically disposed state during the forward and backward swinging, and thus can be used to block the movable chamber 22 from deflecting backward, so as to limit the movable chamber 22 in the first state.

On the basis of the above embodiments, other embodiments can be obtained by replacing and improving the related technical features. For example, the deflecting motion mechanism 30 may employ various prior arts such as a gear transmission mechanism, a link transmission mechanism, etc. which can act on the movable chamber 22 to deflect it. For another example, the second end of the swing lever 35 of the yaw movement mechanism 30 may also be slidably restrained on the inner wall surface of the front side wall of the movable chamber 22. For another example, the smoke barrier 24 may be disposed on the front side wall of the movable chamber 22 in an inverted manner. For another example, the connecting component between the fixed cavity and the movable cavity is not limited to a flexible component, and various existing matching structures capable of achieving sealing and air tightness at the joint position in the deflection process can be adopted between the fixed cavity and the movable cavity, such as structure matching at the connecting position of the fixed cavity and the movable cavity. Furthermore, the flexible member between the fixed cavity and the movable cavity is not limited to be in an annular structure, and the flexible member may be provided only in a part of the outer periphery of the joint region between the fixed cavity and the movable cavity.

Claims (10)

1. A range hood, comprising:

the smoke exhaust ventilator comprises a shell (10), wherein a fan system is arranged in the shell (10), a smoke inlet cavity (20) extending vertically is formed in the lower portion of the shell (10), and an air inlet is formed in the smoke inlet cavity (20);

the method is characterized in that: the smoke inlet cavity (20) comprises a fixed cavity (21) and a movable cavity (22) which is positioned below the fixed cavity (21) and communicated with the fixed cavity (21), the air inlet is formed in the bottom wall and/or the rear side wall of the movable cavity (22), the movable cavity (22) is connected below the fixed cavity (21) in a manner of being capable of deflecting back and forth relative to the fixed cavity (21) and at least has a first state and a second state;

in the first state, the movable cavity (22) extends downwards from the fixed cavity (21), so that the smoke inlet cavity (20) is vertically arranged on the whole;

in the second state, the movable cavity (22) deflects forwards relative to the fixed cavity (21) and inclines forwards from top to bottom.

2. The range hood of claim 1, wherein: the air inlet comprises a main air inlet (221) arranged on the rear side wall of the movable cavity (22) and an auxiliary air inlet (222) positioned on the bottom wall of the movable cavity (22).

3. The range hood of claim 2, wherein: the main air inlet (221) comprises first air inlet holes (2210) which extend vertically and are distributed at intervals in the left-right direction, and the auxiliary air inlet (222) comprises second air inlet holes (2220) which extend forwards and backwards and are distributed at intervals in the left-right direction.

4. The range hood of any one of claims 1-3, wherein: the upper portion of the movable cavity (22) is connected with the lower portion of the fixed cavity (21) through a flexible piece (23), a deflection movement mechanism (30) is further arranged in the fixed cavity (21), the deflection movement mechanism (30) comprises a driving piece and a swing rod (35), the swing rod (35) is in transmission connection with a power output end of the driving piece, so that the swing rod can swing in the front-back direction, the swing rod (35) can act on the movable cavity (22) in the forward swing process, and the movable cavity (22) bends at the flexible piece (23) to deflect forwards.

5. The range hood of claim 4, wherein: the swinging rod (35) has a vertical placing state in the process of swinging back and forth, and is used for blocking the movable cavity (22) from deflecting backwards so as to limit the movable cavity (22) in the first state.

6. The range hood of claim 4, wherein: the deflection movement mechanism (30) further comprises a transmission shaft (32) extending along the left and right directions of the fixed cavity (21), the transmission shaft (32) is rotatably arranged on the inner wall of the fixed cavity (21) by taking the axis of the transmission shaft as a rotation center, the driving part is a first motor (31), an output shaft of the first motor (31) is in transmission connection with the transmission shaft (32), a first end of a swing rod (35) is connected to the transmission shaft (32) and can swing back and forth under the driving of the transmission shaft (32), and a second end of the swing rod (35) can abut against the front side wall of the movable cavity (22) in the forward swing process.

7. The range hood of claim 6, wherein: the number of the swing rods (35) is two, and the swing rods are arranged at intervals along the length direction of the transmission shaft (32).

8. The range hood of any one of claims 1-3, wherein: the cigarette separating device is characterized by further comprising a cigarette separating screen (24), wherein the cigarette separating screen (24) is arranged on the front side wall of the movable cavity (22) in a sliding adjustable mode, and is provided with an unfolding state of downwards sliding to extend out of the bottom wall of the movable cavity (22) and a folding state of upwards sliding to be folded on the front side wall of the movable cavity (22).

9. The range hood of claim 8, wherein: still include linear motion mechanism (40), this linear motion mechanism (40) includes fixing base (41), second motor (42), lead screw (43), slider (44), fixing base (41) are located on the preceding lateral wall of activity cavity (22), lead screw (43) rotate to be located on fixing base (41) to extend along upper and lower direction, second motor (42) with lead screw (43) transmission is connected, slider (44) slip restraint is in on lead screw (43), separate smoke screen (24) and locate on slider (44).

10. The range hood of claim 9, wherein: the range hood further comprises an oil smoke concentration sensor (50) arranged on the smoke inlet cavity (20), and the oil smoke concentration sensor (50) is electrically connected to a control system of the range hood, so that the control system can control the second motor (42) to act according to a received signal of the oil smoke concentration sensor (50).

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