CN109780597B

CN109780597B - Fume exhauster

Info

Publication number: CN109780597B
Application number: CN201711107114.6A
Authority: CN
Inventors: 周佳杰; 王青山; 梁雪斐; 刘逸; 茅忠群; 诸永定; 刘戈
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2017-11-10
Filing date: 2017-11-10
Publication date: 2024-01-16
Anticipated expiration: 2037-11-10
Also published as: CN109780597A

Abstract

The invention discloses a range hood, which comprises a fume collecting hood, wherein an upwardly concave fume collecting cavity is formed in the fume collecting hood, and a fume collecting plate is arranged at the bottom of the fume collecting cavity, and is characterized in that: the smoke collecting plate is provided with a first air inlet hole and a second air inlet hole which are arranged at intervals in the left and right directions, and a first turning plate capable of turning over relative to the smoke collecting plate to open or close the first air inlet hole and a second turning plate capable of turning over relative to the smoke collecting plate to open or close the second air inlet hole are arranged above the smoke collecting plate. By arranging the turning plate which turns over relative to the smoke collecting plate, the air inlet holes are opened or closed, so that the two air inlet holes are respectively aimed at respective furnace heads on the kitchen range, the concentrated guiding of the negative pressure area is fully utilized, and the smoke absorbing effect is improved; and the two air inlet holes can be adjusted according to the use condition of the cooking bench, so as to achieve precise alignment and suction.

Description

Fume exhauster

Technical Field

The invention relates to kitchen appliances, in particular to a range hood.

Background

The range hood has become one of the indispensable kitchen appliances in modern families. The conventional range hood comprises a top suction type range hood and a near suction type range hood, wherein the top suction type range hood utilizes the principle of rising hot air to suck and discharge the naturally rising oil smoke generated during cooking, and has wider and wider application due to the advantages of neatness, light weight, small occupied space and the like.

At present, most of the existing top-suction type range hoods (thin, deep or tower type range hoods which are arranged right above a kitchen range and do not comprise side suction and lower discharge) have the following structural forms: the top is provided with a fume collecting hood which forms an inner concave cavity (fume collecting cavity), and an air inlet and a filter screen are arranged on the fume collecting hood. The oil smoke generated in the cooking process is collected in the smoke collecting cavity and is discharged outside through the air duct communicated with the smoke collecting cavity. The invention discloses a range hood disclosed in China patent application number 200520086100.7, which comprises a fume collecting hood arranged at the lower part and an air duct designed at the upper part of the fume collecting hood, wherein an air inlet ring connected with the bottom end of the air duct is arranged in the middle part of the fume collecting hood, a fan is arranged in the air duct, an oil filter screen is arranged at the lower part of the air inlet ring, and an oil cup is arranged at the lower part of the oil filter screen. The negative pressure area of the range hood is mainly concentrated near the air inlet, that is, the high negative pressure area is mainly concentrated in the middle, and the air suction mode is unfavorable for users who adopt a double-hole range or a multi-hole range, so that the range hood is easy to overflow from the left side, the right side and the front side of the range hood.

In order to improve the oil smoke absorbing effect, some range hoods with smoke guide plates are also disclosed at present, and the oil smoke can be led to the left side, the right side and the front side by generating a wall attaching effect when passing through the smoke guide plates. The top-draft type range hood disclosed in the Chinese patent application with the application number of 201410315985.7 comprises a fume collecting hood and an air inlet arranged on the bottom surface of the fume collecting hood, wherein an oil collecting plate is fixed under the air inlet and forms a four-side air inlet channel with the bottom surface of the air inlet, and a guide hood cover is arranged on the lower surface of the oil collecting plate; as another example 201410419676.4, the smoke collecting hood comprises a smoke collecting hood, a smoke guide plate and a machine body, wherein an air inlet is formed in the smoke collecting hood, the guide plate is opposite to the air inlet of the smoke collecting hood, a preset interval is kept between the guide plate and the smoke collecting hood to form a smoke channel, and a fan system is arranged in the machine body.

In the prior art schemes, a fan system is a multi-wing centrifugal fan, and is a single Kong Jinfeng, and an air inlet channel cannot be adjusted according to the use condition of a cooking bench; the multi-wing centrifugal fan is low in static pressure, small in negative pressure area, lack of negative pressure centralized guide and unsatisfactory in smoke sucking and discharging effect, and if the negative pressure area cannot be used in a centralized manner, the smoke leakage problem is difficult to solve; when the range hood is not used, the range hood cannot be automatically closed, and the odor of the oil smoke cannot be effectively prevented.

Disclosure of Invention

The invention aims to solve the technical problems of the prior art and provides a range hood for improving the efficiency of fume suction.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a range hood, includes the collection petticoat pipe, be formed with the collection cigarette chamber of undercut in the collection petticoat pipe, the bottom in collection cigarette chamber is provided with collection cigarette board, its characterized in that: the smoke collecting plate is provided with a first air inlet hole and a second air inlet hole which are arranged at intervals in the left and right directions, and a first turning plate capable of turning over relative to the smoke collecting plate to open or close the first air inlet hole and a second turning plate capable of turning over relative to the smoke collecting plate to open or close the second air inlet hole are arranged above the smoke collecting plate.

In order to realize automatic overturning and independent control of the overturning plate, a first driving mechanism and a first transmission mechanism for driving the first overturning plate to overturn, and a second driving mechanism and a second transmission mechanism for driving the second overturning plate to overturn are further arranged above the smoke collecting plate.

Preferably, in order to facilitate the smooth turning of the first turning plate, the first transmission mechanism comprises a first supporting seat, a second supporting seat, a first connecting rod, and a second connecting rod, wherein the first connecting rod is arranged adjacent to the first supporting seat and is used for being connected with the first turning plate, the second connecting rod is arranged adjacent to the second supporting seat and is used for being connected with the first turning plate, one of the first supporting seat and the second supporting seat is arranged at the front side of the first air inlet hole, and the other of the first supporting seat and the second supporting seat is arranged at the rear side of the first air inlet hole; the first driving mechanism is provided with a first output shaft penetrating through the first supporting seat, the first connecting rod is rotationally connected with the first output shaft, and the second connecting rod is rotationally connected with the second supporting seat.

For the first drive mechanism of being convenient for drives first board that turns over, first drive mechanism still includes the first backup pad that sets up on first board that turns over, shape, the size of first board and the shape, the size adaptation of first fresh air inlet, first backup pad is greater than first board that turns over, first board that turns over is fixed on the lower surface of first backup pad, first connecting rod and second connecting rod are connected with first backup pad respectively.

In order to reduce the escape of the oil smoke, the end part, which is connected with each supporting seat and is positioned above the first air inlet hole, of the first supporting plate is provided with a first bending part which is bent upwards and smoothly in transition, and the first bending part is bent in an arc shape.

Preferably, in order to facilitate the smooth turning of the second turning plate, the second transmission mechanism comprises a third supporting seat, a fourth supporting seat, a third connecting rod, and a fourth connecting rod, wherein the third connecting rod is arranged adjacent to the second supporting seat and is used for being connected with the second turning plate, the fourth connecting rod is arranged adjacent to the fourth supporting seat and is used for being connected with the second turning plate, one of the third supporting seat and the fourth supporting seat is arranged at the front side of the second air inlet hole, and the other of the third supporting seat and the fourth supporting seat is arranged at the rear side of the second air inlet hole; the second driving mechanism is provided with a second output shaft penetrating through the second supporting seat, the third connecting rod is rotationally connected with the second output shaft, and the fourth connecting rod is rotationally connected with the fourth supporting seat.

For the second drive mechanism of being convenient for drives the second and turns over the board, second drive mechanism still includes the second backup pad that sets up on the board is turned over to the second, shape, size that the second turned over the board and shape, the size adaptation of second fresh air inlet, the second backup pad is greater than the second and turns over the board, the second turns over the board and fixes on the lower surface of second backup pad, third connecting rod and fourth connecting rod are connected with the second backup pad respectively.

In order to reduce the escape of the oil smoke, the end part, which is connected with each supporting seat and is positioned above the second air inlet hole, of the second supporting plate is provided with a second bending part which is bent upwards and smoothly in transition, and the second bending part is bent in an arc shape.

For the space of make full use of collection cigarette board top, first actuating mechanism and first drive mechanism set up in the left side of collection cigarette board, second actuating mechanism and second drive mechanism set up in the right side of collection cigarette board, make two turn over the board towards the direction upset of keeping away from each other in order to open corresponding fresh air inlet, the direction upset of being close to each other in order to close corresponding fresh air inlet from this.

For improving fan efficiency and wind pressure, promote oil smoke absorption efficiency for the negative pressure district is more concentrated, and it is more smooth and easy to discharge fume, collection cigarette cover top is provided with the machine case, the quick-witted incasement is provided with fan system, fan system adopts ternary fan, fan system's air intake orientation forward and be with the horizontal direction place in quick-witted incasement in slope.

Compared with the prior art, the invention has the advantages that: by arranging the turning plate which turns over relative to the smoke collecting plate, the air inlet holes are opened or closed, so that the two air inlet holes are respectively aimed at respective furnace heads on the kitchen range, the concentrated guiding of the negative pressure area is fully utilized, and the smoke absorbing effect is improved; the two air inlet holes can be adjusted according to the use condition of the cooking bench, so that precise alignment and suction are realized; when the kitchen ventilator is closed, the filter screen and the fan system with greasy dirt can be hidden, so that the smell of the lampblack can be effectively prevented, and meanwhile, the kitchen ventilator is clean and tidy, is convenient to clean, and has obvious improvement effect on the kitchen air environment; the overturning mode of the overturning plate reduces the installation space; by adopting the ternary fan, the fan has compact structure, relatively small size, high fan efficiency and high air pressure, and the generated negative pressure gradient is large, so that the smoking efficiency is greatly improved; and the ternary fan is obliquely arranged in the case, so that direct suction and direct discharge are realized, the negative pressure area is concentrated, the pipeline resistance is reduced, the smoke discharge is smoother, and the noise source is far away from a user.

Drawings

Fig. 1 is a schematic view of an open state of an air inlet of a range hood according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of the range hood of fig. 1;

FIG. 3 is a partial schematic view of the range hood of FIG. 1;

FIG. 4 is an exploded view of FIG. 3;

fig. 5 is a schematic view illustrating a closed state of an air inlet of the range hood according to an embodiment of the present invention;

fig. 6 is a partial schematic view of the range hood of fig. 5.

Detailed Description

The invention is described in further detail below with reference to the embodiments of the drawings.

Referring to fig. 1 to 6, a range hood includes a hood 1, a cabinet 2 above the hood 1, and a fan system 4 disposed in the cabinet 2. Hereinafter, for convenience of description, "front", "rear", "left", "right", "upper", "lower" refer to the direction of the user when the range hood is in use, but do not constitute a limitation on the technical solution.

The fume collecting hood 1 comprises an inner housing 11 and an outer housing 12, the inner housing 11 comprises a plurality of side plates 111 and a top plate 112 arranged at the top of the side plates 111, the side plates 111 and the top plate 112 together form an upwardly concave fume collecting cavity 13, the shape of the fume collecting cavity 13 is not limited, for example, the top plate 12 can be horizontal or inclined relative to the horizontal, and thus the fume collecting cavity 13 is in a T shape or a tower shape and the like. The inner ends of the top plates 112 close to each other form an air inlet 14 for oil smoke entering the chassis 2 from the smoke collecting cavity 13, and the inner ends of the top plates 112 of the outer cover shell 12 and the inner cover shell 11 are respectively connected to the bottom end of the chassis 2.

An air duct 25 is formed in the case 2, and a filter screen 26 is disposed at an inlet of the air duct 25. In the present embodiment, the screen 26 is a flat screen in the form of a grid, and alternatively, the screen 26 may be a rotary screen, an upward concave reverse screen, or the like.

The bottom of the fume collecting hood 1 is provided with fume collecting plates 3, and the fume collecting plates 3 are arranged between the bottoms of the side plates 111 of the inner hood shell 11 of the fume collecting hood 1 and positioned at the bottom of the fume collecting cavity 13. The fume collecting hood 1 and the fume collecting plate 3 can be integrally formed.

The smoke collecting plate 3 is provided with a first air inlet hole 31 and a second air inlet hole 32 which are arranged at intervals in the left and right directions, so that each air inlet hole corresponds to one of the kitchen ranges. Compared with the traditional common range hood, the double air inlet channel has the advantages that the flow channels are relatively concentrated and reasonable, and the path of the outward radiation of a noise source of the range hood is reduced, so that the noise is lower, and the use experience is better. The oil smoke can enter the smoke collecting cavity 13 through each air inlet hole, enter the case 2 from the smoke collecting cavity 13 through the air inlet 14 in the middle of the top plate 112, and be discharged outside the case 2 through the fan system 4 arranged in the case 2.

The distance between the centers of the two air inlets can be selected and designed according to the size of the center distance of the cooking range. While the shape of each inlet opening may be selected from a variety of shapes such as circular, oval, square, or any other irregular shape.

The first air inlet hole 31 can be provided with the first turning plate 81, and the second air inlet hole 31 can be provided with the second turning plate 82, so that the first air inlet hole 31 and the second air inlet hole 32 can be opened and closed. In this embodiment, the first and second flaps 81 and 82 may be independently controlled and may be turned over with respect to the corresponding air inlet holes, thereby independently opening and closing the corresponding air inlet holes. Inside the smoke collecting cavity 13, at a position above the smoke collecting plate 3, a first driving mechanism 83 and a first transmission mechanism 84 for driving the first turning plate 81 to turn over, and a second driving mechanism 85 and a second transmission mechanism 86 for driving the second turning plate 82 to turn over are arranged. Preferably, the first drive mechanism 83 and the second drive mechanism 85 are identical in structure. For ease of fixing, the above-described driving mechanisms and transmission mechanisms are provided on the upper surface of the smoke collecting plate 3.

The first driving mechanism 83 is disposed at the rear side of the first air inlet hole 31, and the second driving mechanism 85 is disposed at the front side of the second air inlet hole 32. Alternatively, the first driving mechanism 83 may be provided on the front side of the first air intake hole 31, and the second driving mechanism 85 may be provided on the rear side of the second air intake hole 32; alternatively, the first driving mechanism 83 may be provided on the front side of the first air intake hole 31, and the second driving mechanism 85 may be provided on the front side of the second air intake hole 32; alternatively, the first driving mechanism 83 may be provided on the rear side of the first air intake hole 31, and the second driving mechanism 85 may be provided on the rear side of the second air intake hole 32. The first driving mechanism 83 and the second driving mechanism 85 are preferably motors, or other mechanisms capable of driving the load to rotate can be adopted. The first drive mechanism 83 and the second drive mechanism 85 have a first output shaft 831 and a second output shaft 851, respectively. In order to fully utilize the space on the smoke collecting plate 3 and avoid the interference of the two driving mechanisms, the two turning plates interfere in the turning process, the first driving mechanism 83 is positioned at the left side of the smoke collecting plate 3, the first output shaft 831 extends rightwards, the second driving mechanism 85 is positioned at the right side of the smoke collecting plate 3, and the second output shaft 851 extends leftwards. The two turning plates turn towards the directions away from each other to open the respective corresponding air inlets, and turn towards the directions close to each other to close the respective corresponding air inlets.

The first transmission mechanism 84 includes a first support plate 841, a first support seat 842, a second support seat 843, a first link 844, and a second link 845 provided on the first flap 81. The shape and size of the first flap 81 are adapted to those of the first air inlet hole 31, and the first support plate 841 is larger than the first flap 81, and the first flap 81 is fixed on the lower surface of the first support plate 81.

The first support 842 is disposed at the rear side of the first air inlet hole 31 and at the front side of the first driving mechanism 83, and preferably, the first support 842 is disposed at the left side of the smoke collecting plate 3. The first support seat 842 is provided with a first through hole 8421, and the first output shaft 831 of the first driving mechanism 83 is connected to the first link 844, preferably, to the middle portion of the first link 844, from the rear side of the first support seat 842 forward through the first through hole 8421. The right side of the connection of the first link 844 with the first output shaft 831, preferably, the right side end is connected to the first support plate 841.

The second support 843 is provided at the front side of the first air inlet hole 31, preferably, at the left side on the smoke collecting plate 3. The second link 845, preferably, is pivotally connected at a central portion thereof to the second support 843 by a first pivot 846. The right side of the connection of the second link 845 with the second support 843, preferably, the right side end is connected to the first support plate 841. The rear and front sides of the first support plate 841 may have first and second turnover parts 8412 and 8413 turned upward, respectively, to be connected with the first and second links 844 and 845, respectively.

Therefore, when the first driving mechanism 83 is started, the first output shaft 831 can drive the first link 844 to rotate, and the first turning plate 81 is driven by the first supporting plate 841 to turn over relative to the first air inlet hole 31, preferably, the turning angle is smaller than 90 degrees. The first support plate 841 is located above the left side of the first air inlet hole 31, and is provided with a first bending part 8411 which is bent upwards and smoothly transits near the end part connected with each support seat, and the first bending part 8411 is bent in an arc shape. Therefore, when the first turning plate 81 is opened, the first bending part 8411 is tightly attached to the smoke collecting plate 3 and can be used for sealing the left upper side of the first air inlet hole 31, so that the effect of oil smoke flowing between the first supporting plate 841 and the corresponding side plate 111 from the position to suck the oil smoke is avoided, and meanwhile, the first turning plate 81 can also play a role in guiding the oil smoke, so that the oil smoke can enter the chassis 2 faster and more stably.

The second transmission mechanism 86 includes a second support plate 861, a third support seat 862, a fourth support seat 863, a third link 864, and a fourth link 865 provided on the second flap 82. The shape and size of the second flap 82 are adapted to those of the second air inlet hole 32, and the second support plate 861 is larger than the second flap 82, and the second flap 82 is fixed on the lower surface of the second support plate 82.

The third holder 862 is provided at the front side of the second air inlet hole 32 and at the rear side of the second driving mechanism 85, and preferably, the third holder 862 is provided at the right side of the smoke collecting plate 3, thereby avoiding interference with the first driving mechanism 84. The third support 862 is provided with a second through hole 862, and the second output shaft 851 of the second driving mechanism 85 is connected to the third link 864 from the front side of the third support 862 back through the second through hole 8621, preferably, is connected to the middle of the third link 864. The left side of the connection of the third link 864 with the second output shaft 851, preferably, the left side end is connected to the second support plate 842.

The fourth support 863 is disposed at the rear side of the second air inlet hole 32, preferably, at the right side on the smoke collecting plate 3, thereby avoiding interference with the first transmission mechanism 84. The fourth link 865, preferably, is rotatably coupled to the fourth support 863 at a middle portion thereof by a second rotation shaft 866. The left side of the connection of the fourth link 865 with the fourth support seat 863, preferably, the left side end is connected to the second support plate 861. The front and rear sides of the second support plate 861 may have third and fourth turnups 8612 and 8613 turned up, respectively, to be connected with the third and fourth links 864 and 865, respectively.

Therefore, when the second driving mechanism 85 is started, the second output shaft 851 can drive the third connecting rod 864 to rotate, so that the second support plate 861 drives the second turning plate 82 to turn over relative to the second air inlet 32, and preferably, the turning angle is smaller than 90 degrees. The second support plate 861 is located above the right side of the second air inlet 32, and is close to the end connected to each support seat, and has an upwardly bent and smoothly transited second bending portion 8611, where the second bending portion 8411 is bent in an arc shape. Therefore, when the second turning plate 82 is opened, the second bending part 8611 is tightly attached to the smoke collecting plate 3 and can be used for sealing the right upper side of the second air inlet hole 32, so that the effect of oil smoke flowing between the second supporting plate 861 and the corresponding side plate 111 from the position to suck the oil smoke is avoided, and meanwhile, the second turning plate 82 can also play a role in guiding the oil smoke, so that the oil smoke can enter the case 2 faster and more stably.

The fan system 4 in the case 2 adopts a ternary fan, and can adopt the prior art, such as the fan structure disclosed in the patent of the applicant with the application number of 201620102790.9, and an air outlet of the fan system 4 is provided with an air outlet cover 5 for discharging the oil smoke discharged by the fan system 4 to an air outlet pipeline. The air intake 41 of the fan system 4 is directed forward and is disposed in the cabinet 2 obliquely to the horizontal. The fan system 4 is obliquely arranged in such a way, the negative pressure area is concentrated, so that the resistance of a pipeline is reduced, and smoke discharge is smoother.

When the range hood works, the first driving mechanism 83 and the second driving mechanism 85 start to operate, and the first turning plate 81 covered on the first air inlet hole 31 and the second turning plate 82 covered on the second air inlet hole 32 are turned to two sides to be opened at a certain angle, see fig. 1 and 3. Or only one of the turning plates can be driven to act according to the cooking condition.

When the range hood is closed, the first driving mechanism 83 and the second driving mechanism 85 start to operate, and the first turning plate 81 and the second turning plate 82 are turned towards the middle of the smoke collecting plate 3 respectively until the first air inlet hole 31 and the second air inlet hole 32 which are respectively corresponding to each other are covered, so that the whole smoke collecting plate 3 is closed and integrated, and see fig. 5 and 6. Therefore, the filter screen and the fan system with greasy dirt can be hidden, the odor of the lampblack can be effectively prevented, and meanwhile, the range hood is clean and tidy, is convenient to clean, and has obvious improvement effect on the air environment of a kitchen.

The turnover plate turnover mode reduces the installation space, can lead the two air inlet holes to be respectively aimed at respective furnace heads on the kitchen range, fully utilizes the concentrated guiding of the negative pressure area, and can realize the flow guiding function after turnover and improve the fume suction effect; and the two air inlet holes can be adjusted according to the use condition of the cooking bench, so as to achieve precise alignment and suction.

Claims

1. The utility model provides a range hood, includes collection petticoat pipe (1), be formed with upwards sunken collection cigarette chamber (13) in collection petticoat pipe (1), the bottom in collection cigarette chamber (13) is provided with collection cigarette board (3), its characterized in that: the smoke collecting plate (3) is provided with a first air inlet hole (31) and a second air inlet hole (32) which are arranged at intervals in the left-right direction, a first turning plate (81) which can turn over relative to the smoke collecting plate (3) to open or close the first air inlet hole (31) and a second turning plate (82) which can turn over relative to the smoke collecting plate (3) to open or close the second air inlet hole (32) are arranged above the smoke collecting plate (3);

a first driving mechanism (83) and a first transmission mechanism (84) for driving the first turning plate (81) to turn over, and a second driving mechanism (85) and a second transmission mechanism (86) for driving the second turning plate (82) to turn over are also arranged above the smoke collecting plate (3);

the first transmission mechanism (84) comprises a first supporting seat (842), a second supporting seat (843), a first connecting rod (844) which is arranged adjacent to the first supporting seat (842) and used for being connected with the first turning plate (81), a second connecting rod (845) which is arranged adjacent to the second supporting seat (843) and used for being connected with the first turning plate (81), and a first supporting plate (841) which is arranged on the first turning plate (81), one of the first supporting seat (842) and the second supporting seat (843) is arranged on the front side of the first air inlet hole (31), and the other of the first supporting seat (842) and the second supporting seat (843) is arranged on the rear side of the first air inlet hole (31); the first driving mechanism (83) is provided with a first output shaft (831) penetrating through a first supporting seat (842), the first output shaft (831) is connected to the middle part of the first connecting rod (844), and the right side of the connection part of the first connecting rod (844) and the first output shaft (831) is connected to a first supporting plate (841); when the first driving mechanism (83) is started, the first connecting rod (844) is driven to rotate through the first output shaft (831), and the second connecting rod (845) is connected with the second supporting seat (843) in a rotating mode.

2. The range hood of claim 1, wherein: the shape and the size of the first turning plate (81) are matched with those of the first air inlet hole (31), the first supporting plate (841) is larger than the first turning plate (81), the first turning plate (81) is fixed on the lower surface of the first supporting plate (841), and the first connecting rod (844) and the second connecting rod (845) are connected with the first supporting plate (841) respectively.

3. The range hood of claim 2, wherein: the end part, which is close to the first support plate (841) and is connected with each support seat and is positioned above the first air inlet hole (31), is provided with a first bending part (8411) which is bent upwards and smoothly transited, and the first bending part (8411) is bent in an arc shape.

4. The range hood of claim 1, wherein: the second transmission mechanism (86) comprises a third supporting seat (862), a fourth supporting seat (863), a third connecting rod (864) which is arranged adjacent to the second supporting seat (843) and used for being connected with the second turning plate (82), a fourth connecting rod (865) which is arranged adjacent to the fourth supporting seat (863) and used for being connected with the second turning plate (82), and a second supporting plate (861) which is arranged on the second turning plate (82), one of the third supporting seat (862) and the fourth supporting seat (863) is arranged on the front side of the second air inlet hole (32), and the other of the third supporting seat (862) and the fourth supporting seat (863) is arranged on the rear side of the second air inlet hole (32); the second driving mechanism (85) is provided with a second output shaft (851) penetrating through a second supporting seat (843), the second output shaft (851) is connected to the middle part of the third connecting rod (864), and the left side of the connection part of the third connecting rod (864) and the second output shaft (851) is connected to a second supporting plate (861); when the second driving mechanism (85) is started, the second output shaft (851) drives the third connecting rod (864) to rotate, and the fourth connecting rod (865) is rotationally connected with the fourth supporting seat (863).

5. The range hood of claim 4, wherein: the shape and the size of the second turning plate (82) are matched with those of the second air inlet hole (32), the second supporting plate (861) is larger than the second turning plate (82), the second turning plate (82) is fixed on the lower surface of the second supporting plate (861), and the third connecting rod (864) and the fourth connecting rod (865) are respectively connected with the second supporting plate (861).

6. The range hood of claim 5, wherein: the end part, which is close to the second support plate (861) and is connected with each support seat and is positioned above the second air inlet hole (32), is provided with a second bending part (8611) which is bent upwards and smoothly transits, and the second bending part (8611) is bent in an arc shape.

7. The range hood according to any one of claims 1 to 6, wherein: the first driving mechanism (83) and the first transmission mechanism (84) are arranged on the left side of the smoke collecting plate (3), and the second driving mechanism (85) and the second transmission mechanism (86) are arranged on the right side of the smoke collecting plate (3), so that the two turning plates turn towards the direction away from each other to open corresponding air inlet holes, and turn towards the direction close to each other to close corresponding air inlet holes.

8. The range hood according to any one of claims 1 to 6, wherein: the utility model discloses a fan, including collection petticoat pipe (1), fan system (4) are provided with machine case (2) above collection petticoat pipe (1), fan system (4) adopt ternary fan, air intake (41) of fan system (4) are forward to be and be with horizontal direction place in machine case (2) in slope.