CN112161305A

CN112161305A - Fume exhaust fan

Info

Publication number: CN112161305A
Application number: CN201910922913.1A
Authority: CN
Inventors: 王磊; 徐鑫; 申志贤
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2021-01-01
Anticipated expiration: 2039-09-27
Also published as: CN112161305B

Abstract

The invention relates to an oil fume suction device, which comprises a shell and a fan system arranged in the shell, and is characterized in that: the casing includes first casing and second casing, first casing has the installation cavity that is used for installing fan system, second casing can the oscilaltion locate first casing, the second casing has the cigarette chamber that advances that can descend to first casing below and vertical extension, it has the cigarette inlet that the confession oil cigarette got into the cigarette chamber to open on the second casing. The vertically extending smoke inlet cavity can be lifted up and down, the smoke inlet is fully close to a smoke source when the smoke inlet is lowered, the smoke suction effect is improved, and the space of the installation wall surface is formed when the smoke inlet is lifted up, so that the space utilization rate is improved, the wall is convenient to clean, and the smoke inlet cavity is convenient to use.

Description

Fume exhaust fan

Technical Field

The invention relates to the technical field of household appliances for kitchens, in particular to a range hood.

Background

Range hood is the electrical apparatus that is essential in the kitchen at present, and is comparatively common and use more extensively to arrange oily smoke purification system in last.

At present, the upward-exhaust oil fume purification system is mainly divided into two types: a top-suction range hood and a near-suction range hood. The top-suction type range hood is more attractive, but the smoke inlet is higher, and the smoke suction effect is limited; compared with a top-suction range hood, the near-suction range hood has a lower smoke inlet, but is influenced by the appearance structure and the internal air duct structure of the near-suction range hood, and the existing near-suction range hood cannot better approach oil smoke, so that the oil smoke suction effect is limited to a great extent.

The smoke inlet cavity vertically arranged below the fan system can be fully close to the cooker and the oil smoke generating source, so that the oil smoke can be quickly sucked into the smoke inlet cavity to be discharged upwards as soon as the oil smoke is generated, and the oil smoke suction effect is improved. However, because the volume of the smoke inlet cavity is larger, the smoke inlet cavity covers the wall, not only occupies a large amount of wall space, but also is not beneficial to cleaning the oil smoke on the wall.

Disclosure of Invention

The invention aims to solve the technical problem of the prior art and provides a range hood which improves the space utilization rate and is convenient for cleaning the wall by lifting a smoke inlet cavity up and down.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides an oil absorption cigarette, includes the casing and locates the fan system in this casing, its characterized in that: the casing includes first casing and second casing, first casing has the installation cavity that is used for installing fan system, second casing can the oscilaltion locate first casing, the second casing has the cigarette chamber that advances that can descend to first casing below and vertical extension, it has the cigarette inlet that the confession oil cigarette got into the cigarette chamber to open on the second casing.

Preferably, the smoke inlet cavity is located the second casing lower part, the cross section on second casing upper portion takes shape to be the U-shaped structure of opening forward, the rear portion of first casing is opened and is had the breach of stepping down that extends about and can supply the second casing lower part to pass transversely, smoke inlet cavity is located under the first casing below state, the U-shaped structure inlays and makes the installation cavity seal relatively in the breach of stepping down. The structure is convenient for providing yielding space for the rising of the smoke inlet cavity, and the sealing of the installation cavity is realized after the smoke inlet cavity descends.

Preferably, the width of the smoke inlet cavity along the installation wall surface is greater than that of the first shell, and the top opening of the smoke inlet cavity is matched with the size of the lower port of the U-shaped structure and is communicated with the lower port of the U-shaped structure. The width of the smoke inlet cavity is increased, which is beneficial to enlarging the adsorption surface and improving the oil smoke absorption effect.

In order to facilitate the lifting of the second shell, a first guide rail extending vertically is arranged on the side wall of the upper portion of the first shell, and correspondingly, a second guide rail capable of being matched with the first guide rail in a guiding mode is arranged on the side wall of the U-shaped structure.

Preferably, the upper portion of the first housing is provided with a mounting plate, the mounting plate is provided with a U-shaped plate capable of enclosing the rear portion and at least part of the side portion of the first housing, the opening of the U-shaped plate faces forward, the end portions of the two side walls are fixedly connected with the side walls of the first housing respectively, a first gap is formed between the side walls of the U-shaped plate and the side walls of the first housing, and the first guide rail is arranged in the first gap and is constrained on the U-shaped plate. A second gap is formed between the rear wall of the U-shaped plate and the rear wall of the first shell, and hanging holes for mounting the U-shaped plate on a mounting wall surface are formed in the rear wall of the U-shaped plate. The U-shaped plate is convenient for assembling the first guide rail and installing the range hood on the installation wall surface.

In the above scheme, a first driving mechanism capable of driving the second housing to move up and down relative to the first housing is connected between the first housing and the second housing.

Preferably, first actuating mechanism includes the lead screw, the nut is vice and the motor, the lead screw can vertically pass the installation cavity rotationally and arrange and the lower extreme extends to the installation cavity below, the vice restraint of nut is on the inner wall of first casing and is connected with the lead screw cooperation, the motor is located first casing top and the output is connected with the upper end of lead screw.

As an improvement, a smoke baffle plate capable of being turned over is arranged at the upper edge of the smoke inlet, and a second driving mechanism capable of gradually closing the smoke inlet in the ascending state of the smoke inlet cavity and gradually opening the smoke inlet in the descending state of the smoke inlet cavity is arranged in the shell. The structure enables the smoke baffle to be opened and closed correspondingly according to the use of the smoke inlet cavity, and is convenient to operate and use.

Preferably, the second driving mechanism includes a first assembly plate, a second assembly plate, a first elastic member, a transmission line and a take-up device, the first assembly plate is arranged on the inner front wall of the smoke inlet cavity and is close to the smoke inlet, the middle part of the second transfer plate is rotatably connected to the first assembly plate, the first end of the second assembly plate is connected to the inner wall surface of the smoke baffle plate, the second end of the second assembly plate is connected to the first end of the transmission line, the take-up device is arranged on the first shell and is connected to the second end of the transmission line, so that the transmission line always keeps a tendency of tightening up on the take-up device, the first elastic member is connected between the first assembly plate and the second assembly plate, the smoke baffle plate always keeps a tendency of closing, and the take-up device is smaller than the tension of the first elastic member on the transmission line. By adopting the structure, when the second shell descends, the transmission line is pulled out and gradually tensioned along with the descending of the second shell, and when the smoke inlet cavity is completely positioned below the first shell, the transmission line pulls the second assembling plate to overcome the elasticity of the first elastic piece to rotate relative to the first assembling plate, so that the smoke baffle plate is driven to turn outwards to open the smoke inlet; when the second casing rose, the drive line loosened gradually and was withdrawed by the spooler, and the cancellation is to the pulling force of second assembly plate, and the second assembly plate rotates for first assembly plate under the pulling force of first elastic component to it closes to drive the cigarette board inwards overturn and advance the mouth of cigarette.

For the convenience of assembly, the first assembling plate is shaped into an L shape, the first end of the L-shaped first assembling plate is restrained at the upper edge of the smoke inlet, the L-shaped first assembling plate is positioned in the smoke inlet cavity, the second end of the L-shaped first assembling plate extends downwards, and the middle part of the second assembling plate extends upwards to form a connecting arm, the end part of the connecting arm can be rotatably connected to the first assembling plate. Be provided with the first connecting axle that transversely extends and arrange near the inner wall of advancing the cigarette chamber on the lateral wall of first assembly plate, correspond, it has the ability with this first connecting axle normal running fit's shaft hole to open on the connecting arm. The first end department of first pilot plate is provided with the second connecting axle that is located first connecting axle top, the middle part of second pilot plate main part is provided with the third connecting axle, the first end of elastic component is connected with the second connecting axle, the second end of elastic component is connected with the third connecting axle. The first end of the second assembling plate is obliquely bent outwards relative to the main body part and arranged at an obtuse angle with the main body part.

Preferably, the upper portion of the first assembling plate is provided with a first stopper capable of cooperating with an upper edge of the second assembling plate to restrain a rising position of the second housing, and the lower portion of the first assembling plate is provided with a second stopper capable of cooperating with a lower edge of the second assembling plate to restrain a falling position of the second housing. The structure can restrict the turning angle of the smoke baffle plate to prevent the smoke baffle plate from turning excessively.

Preferably, a pulley is arranged at the lower end of the first assembling plate, and the first end of the transmission line is connected with the second end of the second assembling plate by passing through the bottom of the pulley. The pulley provides support for the transmission line to realize transmission of the transmission line force and maintain the direction of the proper force.

Preferably, the spooler is located on the inner wall of first casing and includes shell, reel and clockwork spring, the inside cavity of shell forms the holding chamber and the opening that has and hold the chamber and be linked together is opened to the bottom, the reel can be located in the shell rotatoryly, the second end of driving wire passes the opening winding on the reel, the clockwork spring is located in the reel and makes the driving wire keep the trend of tightening up. The wire rewinding device can enable the transmission wire to always keep orderly tightness, and the transmission wire is prevented from being wound to influence use.

Preferably, a stopper capable of restricting the extending length of the transmission line is further disposed on the side wall of the first housing. The stopper includes first uide bushing, second uide bushing and second elastic component, the first uide bushing restraint is on the inside wall of first casing, the second uide bushing can locate on the first uide bushing with reciprocating, the second elastic component is located between first uide bushing and the second uide bushing and makes the second uide bushing keep the trend of rebound throughout for first uide bushing, open the middle part of second uide bushing has the through-hole that supplies the drive line to pass, be provided with the third stopper that can offset with the upper end of through-hole on the drive line. The structure can restrain the release length of the transmission line and is matched with the elastic transition of the limiter, so that the smoke baffle plate can realize stable turnover; meanwhile, the structure is also favorable for controlling the tightness of the transmission line, and the damage to the device caused by the fact that the smoke baffle plate cannot be opened or the tensile force is too large due to the change of the length of the transmission line and the like is avoided.

Compared with the prior art, the invention has the advantages that: the vertically extending smoke inlet cavity can be lifted up and down, the smoke inlet is fully close to a smoke source when the smoke inlet is lowered, the smoke suction effect is improved, and the space of the installation wall surface is formed when the smoke inlet is lifted up, so that the space utilization rate is improved, the wall is convenient to clean, and the smoke inlet cavity is convenient to use.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of the embodiment of FIG. 1 in another angle;

FIG. 3 is a cross-sectional view of an embodiment of the present invention;

FIG. 4 is another cross-sectional view of an embodiment of the present invention;

FIG. 5 is an enlarged schematic view of portion A of FIG. 3;

FIG. 6 is an enlarged schematic view of portion B of FIG. 4;

FIG. 7 is a schematic structural diagram of a second housing according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of the first housing in the embodiment of the present invention.

Detailed Description

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

As shown in fig. 1 to 8, the range hood of the present embodiment includes a housing 1 and a fan system 2 disposed in the housing 1. The lower part of the shell 1 is provided with a smoke inlet cavity 121 which extends vertically, the front side wall of the lower part of the shell 1 is provided with a smoke inlet 120 which is communicated with the smoke inlet cavity 121, the width of the upper part of the shell 1 in the front-back direction is larger than that of the lower part, the upper part of the shell 1 is provided with a smoke collection cavity 112 which is communicated with the smoke inlet cavity 121, and the part of the smoke collection cavity 112 positioned at the front side of the smoke inlet cavity 121 forms a mounting cavity 111 for mounting the fan system 2. It should be noted that, the installation cavity 111 is used for installing the fan system 2, but the installation position of the fan system 2 should not be completely limited in the installation cavity 111, and since the smoke collection cavity 112 is integral with the installation cavity 111, when the fan system 2 is installed, a part of the fan system 2 can be located in the smoke collection cavity 112 according to the requirement. Because the smoke inlet chamber 121 at the lower part of the shell 1 extends vertically, the smoke inlet chamber 121 can be made thinner along the front-back direction, and can extend downwards to be sufficiently close to a cooker and a smoke generating source, so that the smoke can be quickly sucked into the smoke inlet chamber to be discharged upwards once being generated, and the smoke suction effect is improved.

As shown in fig. 7 and 8, the housing 1 of the present embodiment includes a first housing 11 and a second housing 12, and the first housing 11 has a mounting cavity 111 and a smoke collection cavity 112. The second housing 12 can be vertically lifted and lowered and is disposed on the first housing 11, the second housing 12 has a smoke inlet 121 which can be lowered to the lower portion of the first housing 11 and vertically extends, and the smoke inlet 120 is disposed at the lower portion of the front side wall of the second housing 12. The smoke inlet cavity 121 is located at the lower portion 12b of the second casing 12, the cross section of the upper portion 12a of the second casing 12 is formed into a U-shaped structure 122 with a forward opening, the rear portion of the first casing 11 is provided with an abdicating notch 113 which extends up and down and can allow the lower portion of the second casing 12 to pass through in the transverse direction, the smoke inlet cavity 121 is located under the first casing 11, and the U-shaped structure 122 is embedded in the abdicating notch 113 to relatively close the mounting cavity 111. The structure is convenient for providing a yielding space for the rising of the smoke inlet cavity 121, and the sealing of the installation cavity 111 is realized after the smoke inlet cavity 121 descends. The width of the smoke inlet cavity 121 along the installation wall surface is greater than that of the first shell 11, and the top opening of the smoke inlet cavity 121 is matched with the size of the lower port of the U-shaped structure 122 and is communicated with the lower port of the U-shaped structure. The width of the smoke inlet cavity 121 is increased, which is beneficial to enlarging the adsorption surface and improving the oil smoke absorption effect.

In this embodiment, as shown in fig. 1 and 2, a vertically extending first rail 114 is disposed on a side wall of an upper portion of the first housing 11, and correspondingly, a second rail 123 capable of guiding and matching with the first rail 114 is disposed on a side wall of the U-shaped structure 122. The first housing 11 is provided at the upper portion with a mounting plate having a U-shaped plate 3 capable of enclosing the rear and part of the side of the first housing 11 therein, i.e., the structure of the mounting plate is not limited to the U-shape as long as the structure of the U-shaped plate 3 in the present embodiment is provided. The opening of the U-shaped plate 3 faces forward, the end portions of the two side walls are respectively fixedly connected with the side walls of the first housing 11, a first gap 31 is formed between the side walls of the U-shaped plate 3 and the side walls of the first housing 11, and the first guide rail 114 is arranged in the first gap 31 and fixed on the U-shaped plate 3 through screws. A second gap 32 is formed between the rear wall of the U-shaped plate 3 and the rear wall of the first housing 11, and a hanging hole 321 for mounting the U-shaped plate 3 on a mounting wall surface is formed on the rear wall. The U-shaped plate 3 not only facilitates the assembly of the first guide rail 114, but also facilitates the installation of the range hood on the installation wall. A first driving mechanism 4 capable of driving the second housing 12 to move up and down relative to the first housing 11 is connected between the first housing 11 and the second housing 12. The first driving mechanism 4 comprises a screw rod 41, a nut pair 42 and a motor 43, the screw rod 41 can vertically penetrate through the smoke collection cavity 112 to be arranged in a rotating mode, the lower end of the screw rod extends to the lower portion of the smoke collection cavity 112, the nut pair 42 is fixed on the inner wall of the first shell 11 and is connected with the screw rod 41 in a matched mode, the motor 43 is arranged on the top of the first shell 11, and the output end of the motor 43 is connected with the upper end of the screw rod 41.

The upper edge of the smoke inlet 120 of this embodiment is provided with a smoke baffle 5 capable of turning over, and the casing 1 is provided with a second driving mechanism 6 capable of gradually closing the smoke inlet 120 when the smoke inlet 121 is in an ascending state and gradually opening the smoke inlet 120 when the smoke inlet 121 is in a descending state. The structure enables the smoke baffle 5 to be correspondingly opened and closed according to the use of the smoke inlet cavity 121, and is convenient to operate and use. The second driving mechanism 6 includes a first assembling plate 61, a second assembling plate 62, a first elastic member 63, a transmission line 64 and a wire rewinding device 65, the first assembling plate 61 is disposed on the inner front wall of the smoke inlet 121 and is disposed near the smoke inlet 120, the middle portion of the second assembling plate 62 is rotatably connected to the first assembling plate 61, the first end of the second assembling plate 62 is connected to the inner wall surface of the smoke baffle plate 5, the second end of the second assembling plate 62 is connected to the first end of the transmission line 64, the wire rewinding device 65 is disposed on the first housing 11 and is connected to the second end of the transmission line 64 so that the transmission line 64 always keeps a tendency of tightening up the transmission line 65, the first elastic member 63 is connected between the first assembling plate 61 and the second assembling plate 62 and keeps the smoke baffle plate 5 always in a tendency of closing, and a tightening force of the transmission line 64 by the wire rewinding device 65 is smaller than a pulling force of the first elastic member 63.

Specifically, as shown in fig. 6, the first fitting plate 61 is formed in an L shape, a first end of the L-shaped first fitting plate 61 is fixed at an upper edge of the smoke inlet 120, the L-shaped first fitting plate 61 is located in the smoke inlet chamber 121, a second end of the L-shaped first fitting plate extends downward, and a middle portion of the second fitting plate 62 extends upward to form a connecting arm 621 whose end portion is rotatably connected to the first fitting plate 61. The first fitting plate 61 is provided with a first connecting shaft 611 extending transversely and disposed close to the inner wall of the smoke inlet 121, and the connecting arm 621 is provided with a shaft hole 6211 capable of rotatably engaging with the first connecting shaft 611. The first end of the first assembly plate 61 is provided with a second connecting shaft 612 positioned above the first connecting shaft 611, the middle of the main body of the second assembly plate 62 is provided with a third connecting shaft 622, the first elastic member 63 is a spring, the first end of the first elastic member 63 is connected with the second connecting shaft 612, and the second end of the first elastic member 63 is connected with the third connecting shaft 622. The first end of the second fitting plate 62 is bent obliquely outward with respect to the body portion and arranged at an obtuse angle to the body portion. The upper portion of the first assembly plate 61 is provided with a first stopper 613 capable of engaging with the upper edge of the second assembly plate 62 to restrain the raised position of the second housing 12, and the lower portion of the first assembly plate 61 is provided with a second stopper 614 capable of engaging with the lower edge of the second assembly plate 62 to restrain the lowered position of the second housing 12. The structure can restrict the turning angle of the smoke baffle 5 to prevent the smoke baffle 5 from turning excessively. A pulley 66 is provided at a lower end of the first assembly plate 61, and a first end of the transmission line 64 is connected to a second end of the second assembly plate 62 by passing around a bottom of the pulley 66. The pulley 66 provides support for the drive line 64 to allow for the transmission of force from the drive line 64 and to maintain the proper direction of the force.

As shown in fig. 5, the wire rewinding device 65 of the present embodiment is disposed on the inner wall of the first case 11 and includes a housing 651, a reel 652 and a spring 653, the housing 651 is hollow to form a receiving cavity 6511, the bottom of the housing 651 is provided with an opening 6512 communicating with the receiving cavity 6511, the reel 652 is rotatably disposed in the receiving cavity 6511, the second end of the power transmission wire 64 is wound on the reel 652 through the opening 6512, and the spring 653 is disposed in the reel 652 and keeps the power transmission wire 64 in a tightening tendency. This spooler 65 enables the drive line 64 to remain the elasticity orderly all the time, avoids the drive line 64 to take place the winding and influence the use.

The side wall of the first housing 11 of this embodiment is further provided with a stopper 67 capable of restricting the extending length of the transmission line 64. As shown in fig. 5, the stopper 67 includes a first guide sleeve 671, a second guide sleeve 672 and a second elastic member 673, the first guide sleeve 671 is fixed on an inner sidewall of the first housing 11, the second guide sleeve 672 is vertically movably disposed on the first guide sleeve 671, the second elastic member 673 is a spring, the second elastic member 673 is disposed between the first guide sleeve 671 and the second guide sleeve 672 and keeps the second guide sleeve 672 always moving upward relative to the first guide sleeve 671, a through hole 6721 for passing the transmission wire 64 is formed in the middle of the second guide sleeve 672, and a third stopper 641 capable of abutting against an upper end of the through hole 6721 is disposed on the transmission wire 64. The structure can restrict the release length of the transmission line 64 and is matched with the elastic transition of the limiting stopper 67, so that the smoke baffle 5 can realize stable turnover; meanwhile, the structure is also beneficial to controlling the tightness of the transmission line 64, and the damage to the device caused by the fact that the smoke baffle 5 is not opened in place or the pulling force is too large due to the change of the length of the transmission line 64 and the like is avoided.

When the second housing 12 descends, the transmission line 64 is pulled out and gradually tensioned along with the descending of the second housing 12, and when the smoke inlet cavity 121 is completely positioned below the first housing 11, the transmission line 64 pulls the second assembling plate 62 to rotate relative to the first assembling plate 61 against the elastic force of the first elastic piece 63, so as to drive the smoke baffle plate 5 to turn outwards and open the smoke inlet 120; when the second housing 12 is lifted, the transmission line 64 is gradually loosened and retracted by the wire drawer 65, the pulling force on the second assembling plate 62 is canceled, and the second assembling plate 62 rotates relative to the first assembling plate 61 under the pulling force of the first elastic member 63, so as to drive the smoke barrier 5 to turn inwards to close the smoke inlet 120.

Claims

1. A range hood, comprising a casing (1), characterized in that: casing (1) includes first casing (11) and second casing (12), first casing (11) have installation cavity (111) that are used for installing fan system (2), second casing (12) can the oscilaltion locate on first casing (11), second casing (12) have can descend to first casing (11) below and vertical extension advance smoke chamber (121), it has smoke inlet (120) that supply the oil smoke to get into smoke chamber (121) to open on second casing (12).

2. The range hood of claim 1, wherein: it is located second casing (12) lower part to advance smoke chamber (121), the cross section shaping on second casing (12) upper portion is opening U-shaped structure (122) forward, the rear portion of first casing (11) is opened and is had upper and lower extension and can supply breach of stepping down (113) that second casing (12) lower part transversely passed, it is located under first casing (11) below state to advance smoke chamber (121), U-shaped structure (122) are set and are making installation cavity (111) closed relatively in the breach of stepping down (113).

3. The range hood of claim 2, wherein: the side wall of the upper part of the first shell (11) is provided with a first guide rail (114) which extends vertically, and correspondingly, the side wall of the U-shaped structure (122) is provided with a second guide rail (123) which can be matched with the first guide rail (114) in a guiding way.

4. The range hood of claim 3, wherein: the upper portion of the first shell (11) is provided with a mounting plate, the mounting plate is provided with a U-shaped plate (3) capable of surrounding the rear portion and at least part of the side portion of the first shell (11), the opening of the U-shaped plate (3) faces forward, the end portions of the two side walls are fixedly connected with the side walls of the first shell (11), a first gap (31) is formed between the side walls of the U-shaped plate (3) and the side walls of the first shell (11), and the first guide rail (114) is arranged in the first gap (31) and restrained on the U-shaped plate (3).

5. The range hood of claim 4, wherein: a second gap (32) is formed between the rear wall of the U-shaped plate (3) and the rear wall of the first shell (11), and a hanging hole (321) for installing the U-shaped plate on an installation wall surface is formed in the rear wall of the U-shaped plate (3).

6. The range hood according to any one of claims 1 to 5, wherein: a first driving mechanism (4) capable of driving the second shell (12) to ascend and descend relative to the first shell (11) is connected between the first shell (11) and the second shell (12).

7. The range hood of claim 6, wherein: first actuating mechanism (4) include lead screw (41), nut pair (42) and motor (43), lead screw (41) can rotate ground vertically to pass installation cavity (111) and arrange and the lower extreme extends to installation cavity (111) below, nut pair (42) retrain on the inner wall of first casing (11) and cooperate with lead screw (41) to be connected, motor (43) are located first casing (11) top and the upper end of output and lead screw (41) is connected.

8. The range hood according to any one of claims 1 to 5, wherein: the cigarette inlet is characterized in that a cigarette blocking plate (5) capable of being turned over is arranged at the upper edge of the cigarette inlet (120), and a second driving mechanism (6) capable of gradually closing the cigarette inlet (120) in the rising state of the cigarette inlet cavity (121) and gradually opening the cigarette inlet (120) in the falling state of the cigarette inlet cavity (121) is arranged in the shell (1).

9. The range hood of claim 8, wherein: the second driving mechanism (6) comprises a first assembling plate (61), a second assembling plate (62), a first elastic piece (63), a transmission line (64) and a wire rewinding device (65), wherein the first assembling plate (61) is arranged on the inner front wall of the smoke inlet cavity (121) and is arranged close to the smoke inlet (120), the middle part of the second assembling plate (62) is rotatably connected to the first assembling plate (61), the first end of the second assembling plate (62) is connected with the inner wall surface of the smoke baffle plate (5), the second end of the second assembling plate (62) is connected with the first end of the transmission line (64), the wire rewinding device (65) is arranged on the second shell (12) and is connected with the second end of the transmission line (64) so as to enable the transmission line (64) to always keep the trend of tightening up the wire rewinding device (65), and the first elastic piece (63) is connected between the first assembling plate (61) and the second assembling plate (62) and enables the smoke baffle plate (5) to always keep the trend of closing, and the tightening force of the wire rewinding device (65) on the transmission wire (64) is smaller than the pulling force of the first elastic piece (63).

10. The range hood of claim 9, wherein: the first assembling plate (61) is shaped into an L shape, the first end of the L-shaped first assembling plate (61) is restrained at the upper edge of the smoke inlet (120), the L-shaped first assembling plate (61) is positioned in the smoke inlet cavity (121) and the second end extends downwards, and the middle part of the second assembling plate (62) extends upwards to form a connecting arm (621) with the end part capable of being rotatably connected to the first assembling plate (61).

11. The range hood of claim 10, wherein: the side wall of the first assembling plate (61) is provided with a first connecting shaft (611) which transversely extends and is arranged close to the inner wall of the smoke inlet cavity (121), and correspondingly, the connecting arm (621) is provided with a shaft hole (6211) which can be in running fit with the first connecting shaft (611).

12. The range hood of claim 11, wherein: the first end of the first assembling plate (61) is provided with a second connecting shaft (612) positioned above the first connecting shaft (611), the middle of the main body of the second assembling plate (62) is provided with a third connecting shaft (622), the first end of the first elastic piece (63) is connected with the second connecting shaft (612), and the second end of the first elastic piece (63) is connected with the third connecting shaft (622).

13. The range hood of claim 9, wherein: a first limiting block (613) which can be matched with the upper edge of the second assembling plate (62) to restrain the ascending position of the second shell (12) is arranged at the upper part of the first assembling plate (61), and a second limiting block (614) which can be matched with the lower edge of the second assembling plate (62) to restrain the descending position of the second shell (12) is arranged at the lower part of the first assembling plate (61).

14. The range hood of claim 9, wherein: a pulley (66) is arranged at the lower end of the first assembling plate (61), and the first end of the transmission line (64) is connected with the second end of the second assembling plate (62) by winding the bottom of the pulley (66).

15. The range hood of claim 9, wherein: and the side wall of the first shell (11) is also provided with a stopper (67) capable of restricting the extending length of the transmission line (64).