CN109764373B - Fume exhauster - Google Patents

Abstract

The invention discloses a range hood, which comprises a fume collecting hood and a case arranged above the fume collecting hood, wherein an upwardly concave fume collecting cavity is formed in the fume collecting hood, a fume collecting plate is arranged at the bottom of the fume collecting cavity, an air duct is formed in the case, a filter screen is arranged at the bottom of the case and at the inlet of the air duct, the filter screen comprises a filter screen body with a small upper part and a large lower part and is in an inverted cone shape, and meshes are densely distributed on the filter screen body; the first air inlet holes and the second air inlet holes which are arranged at intervals in the left and right directions are formed in the smoke collecting plate, a first turning plate which can move and turn over relative to the smoke collecting plate to open or close the first air inlet holes, and a second turning plate which can move and turn over relative to the smoke collecting plate to open or close the second air inlet holes are arranged above the smoke collecting plate. Through setting up the board that turns over of relative album cigarette board removal and upset to open or close the fresh air inlet, can make two fresh air inlets all concentrate the direction to respective furnace end on the cooking utensils respectively, make full use of negative pressure district, promote the oil smoke effect.

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; the oil net is generally in a flat or downward convex funnel shape, and the flat oil net is not suitable for the characteristic of multiple oily foods in the pot and is easy to drip; the funnel-shaped oil net is fixed at the bottom of the range hood and protrudes downwards, the oil fume is divergent when being collected, the fume is shallow, the oil fume cannot be deeply absorbed and is far away from a negative pressure area of the fan, the fume suction effect is affected, and in addition, when a user uses the range hood, the user has visual sense to press, the sight is blocked during cooking, the user is easy to touch the oil net when the user turns over a pan to cook, and the cooking experience of the user is reduced; in addition, when the funnel-shaped oil net is adopted, the smoke exhaust ventilator cannot be provided with the smoke guide plate.

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 collection petticoat pipe and sets up the quick-witted case in collection petticoat pipe top, be formed with the collection cigarette chamber of undercut in the collection petticoat pipe, the bottom in collection cigarette chamber is provided with the collection cigarette board, be formed with wind channel, its characterized in that in the machine case: a filter screen is arranged at the bottom in the case and at the inlet of the air duct, the filter screen comprises a filter screen body with a small upper part and a large lower part and an inverted cone shape, and meshes are densely distributed on the filter screen body; 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 which can move and turn over relative to the smoke collecting plate to open or close the first air inlet hole and a second turning plate which can move and turn over relative to the smoke collecting plate to open or close the second air inlet hole are arranged above the smoke collecting plate.

Preferably, for driving the two turning plates to automatically move and independently control, a first driving mechanism for driving the first turning plate to move, a first guiding mechanism for guiding the first turning plate to move, a second driving mechanism for driving the second turning plate to move and a second guiding mechanism for guiding the second turning plate to move are further arranged above the smoke collecting plate.

Preferably, for driving the first turning plate to move and turn over, the first driving mechanism is provided with a first output end, a first connecting rod is connected between the first driving mechanism and the first turning plate, one end of the first connecting rod is rotationally connected with the first output end of the first driving mechanism, the other end of the first connecting rod is connected to the first turning plate, and the first driving mechanism drives the first connecting rod to move in the left and right directions.

The first guide mechanism comprises a first guide rail and a second guide rail, wherein the first guide rail is provided with two guide rails which are respectively arranged at the front side and the rear side of the smoke collecting plate; the second guide rails are two and are respectively arranged on the front side and the rear side of the smoke collecting plate, each first guide rail and the second guide rail on the corresponding side are arranged at intervals in the left direction and the right direction, and the first turning plate is respectively in sliding fit with the first guide rail and the second guide rail.

Preferably, in order to facilitate the movement and turnover of the first turning plate when the first turning plate receives the force of the first connecting rod, the opposite side surfaces of the two first guide rails are respectively provided with first sliding grooves extending in the left and right directions, the front side, the rear side and the position close to the left end of the first turning plate are respectively provided with first sliding blocks in sliding fit with the first sliding grooves, and each first sliding groove is closed at the left end; the opposite side surfaces of the two second guide rails are respectively provided with a second chute extending in the left and right directions, and the thickness of each second chute is matched with the thickness of the first turning plate so that the first turning plate is inserted into the second chute.

Preferably, for driving the second turning plate to move and turn over, the second driving mechanism is provided with a second output end, a second connecting rod is connected between the second driving mechanism and the second turning plate, one end of the second connecting rod is rotationally connected with the second output end of the second driving mechanism, the other end of the second connecting rod is connected to the second turning plate, and the second driving mechanism drives the second connecting rod to move in the left and right directions.

The second guide mechanism comprises a third guide rail and a fourth guide rail, and the third guide rail is provided with two guide rails and is respectively arranged at the front side and the rear side of the smoke collecting plate; the four guide rails are respectively arranged on the front side and the rear side of the smoke collecting plate, each fourth guide rail and the third guide rail on the corresponding side are arranged at intervals in the left direction and the right direction, and the second turning plate is in sliding fit with the third guide rail and the fourth guide rail.

Preferably, in order to facilitate the movement and turnover of the second turning plate when the second turning plate receives the force of the second connecting rod, the opposite side surfaces of the two third guide rails are respectively provided with third sliding grooves extending in the left and right directions, the front side and the rear side of the second turning plate are respectively provided with a second sliding block in sliding fit with the third sliding grooves at the positions close to the end part of the right side, and each third sliding groove is closed at the end part of the right side; the opposite side surfaces of the two fourth guide rails are respectively provided with a fourth sliding groove extending in the left and right directions, and the thickness of each fourth sliding groove is matched with the thickness of the second turning plate so that the second turning plate can be inserted into the fourth sliding groove.

For the grease of being convenient for collect quick-witted case, fan and filter screen self, the edge of filter screen body outwards extends and is formed with annular oil trap, the outward flange of oil trap extends to the bottom of quick-witted case outward to upwards buckle.

In order to avoid oil in the oil collecting groove from overflowing, an oil dropping hole is formed in the oil collecting groove part positioned at the rear side of the filter screen body.

Compared with the prior art, the invention has the advantages that: by arranging a turning plate which moves and 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 a 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 moving and overturning modes of the overturning plate reduce the installation space; the reverse cone filter screen can enable the negative pressure area to be more concentrated because the oil cup is not required to be arranged in the central area, the structure with the small upper part and the large lower part is beneficial to the effect of cage smoke on the oil smoke gas, so that the gas flow is concentrated at the inlet of the double air inlet channel fan at the upper end, and the oil smoke absorbing effect is better.

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 diagram showing a closed state of an air intake Kong Shange of the range hood according to an embodiment of the invention;

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

fig. 7 is a schematic diagram of a fully closed state of an air inlet of the range hood according to an embodiment of the present invention;

fig. 8 is a partial schematic view of the range hood of fig. 7;

fig. 9 is a schematic view of a filter screen of the range hood according to the present invention.

Detailed Description

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

Referring to fig. 1 to 4, 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 the air duct 25 preferably gradually decreases from bottom to top.

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.

In this embodiment, the fan system 4 is a three-way fan, and the three-way fan may be a three-way fan according to the prior art, as disclosed in chinese patent No. 201310418009. The fan system 4 can be a single ternary fan, two ternary fans connected in parallel or two ternary fans connected in series, and the ternary fans have the characteristics of compact structure, relatively small size, high fan efficiency and high wind pressure, so that the negative pressure gradient can be generated, and the smoking efficiency can be greatly improved. An air outlet cover 5 connected with an air outlet of the fan system 4 is arranged above the case 2, so that the oil smoke can be discharged into a public flue through the air outlet cover 5.

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 flap 81 and the second flap 82 can be independently controlled and can move and turn over with respect to the corresponding air inlet holes, thereby independently opening and closing the corresponding air inlet holes. Inside the smoke collecting chamber 13, at a position above the smoke collecting plate 3, a first driving mechanism 83 for driving the first turning plate 81 to move, a first guiding mechanism 84 for guiding the first turning plate 81 to move, a second driving mechanism 85 for driving the second turning plate 82 to move, and a second guiding mechanism 86 for guiding the second turning plate 82 to move 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. The first driving mechanism 83 and the second driving mechanism 85 are preferably electric push rods, or other mechanisms capable of driving the load to move linearly may be adopted. The first drive mechanism 83 and the second drive mechanism 85 have a first output 831 and a second output 851, respectively. A first link 832 is connected between the first driving mechanism 83 and the first flap 81, and a second link 852 is connected between the second driving mechanism 85 and the second flap 82. One end of the first link 832 is rotatably connected to the first output end 831 of the first driving mechanism 83, and the other end is connected to the front side of the first flap 81, preferably, at a position near the right end of the front side of the first flap 81. One end of the second link 852 is rotatably connected to the first output end 851 of the second driving mechanism 85, and the other end is connected to the front side of the second flap 82, preferably, at a position near the left end of the front side of the second flap 82.

The first guide mechanism 84 includes a first guide post 842, a first guide rail 843, and a second guide rail 844. The first turning plate 81 is provided with a first supporting seat 845, the whole first connecting rod 832 is L-shaped, and the bent end is fixedly connected with the first supporting seat 845 by bending from the position connected with the first output end 831 to the position connected with the first turning plate 81. The top of the first guide pillar 842 is fixedly connected with the top plate 112 of the fume collecting hood 1, a first guide hole 846 is formed in one side, opposite to the first supporting seat 845, of the first turning plate 81, the bottom of the first guide pillar 842 penetrates through the first guide hole 846 downwards, the first guide hole 846 is larger than the penetrating part of the first guide pillar 842, and therefore the first turning plate 81 has a certain movable space relative to the first guide pillar 842.

The first guide 843 has two first sliding grooves 8431 which are respectively arranged on the front and rear sides of the smoke collecting plate 3 and are positioned on the left side of the first air inlet hole 31, and the opposite side surfaces of the two first guide 843 are respectively provided with first sliding grooves 8431 which extend in the left and right directions. The front and rear sides of the first turning plate 81 are respectively provided with a first sliding block 847 at a position close to the left end, each first sliding block 847 is provided with a first guide shaft 8471 which extends away from the first turning plate 81, and the first guide shafts 8471 are in sliding fit with the first sliding grooves 8431 on the first guide rails 843. The first chute 8431 is closed at the left end, thereby defining a limit position in which the first flap 81 moves.

The second guide rails 844 have two, which are respectively disposed on the front and rear sides of the smoke collecting plate 3 and near the right-side end of the first air inlet hole 31, and each of the first guide rails 843 is spaced apart from the corresponding side second guide rail 844 in the left and right directions. The opposite sides of the two second guide rails 844 are respectively provided with a second sliding groove 8441 extending in the left-right direction, and the thickness of the second sliding groove 8441 is matched with the thickness of the first turning plate 81, so that the edge of the first turning plate 81 can be inserted into the second sliding groove 8441.

The second guide mechanism 86 includes a second guide post 862, a third guide rail 863, and a fourth guide rail 864. The second turning plate 82 is provided with a second supporting seat 865, the whole second connecting rod 852 is L-shaped, and is bent from the position connected with the second output end 851 to the position connected with the second turning plate 82, and the bent end is fixedly connected with the second supporting seat 865. The top of the second guide post 862 is fixedly connected with the top plate 112 of the fume collecting hood 1, a second guide hole 866 is formed in one side, opposite to the second supporting seat 865, of the second turning plate 82, the bottom of the second guide post 862 downwards penetrates through the second guide hole 866, the second guide hole 866 is larger than the penetrating part of the second guide post 862, and therefore the second turning plate 82 has a certain movable space relative to the second guide post 862.

The third guide rails 863 have two, front and rear sides respectively disposed on the smoke collecting plate 3 and located on the right side of the second air inlet 32, and opposite sides of the two third guide rails 863 are respectively provided with third slide grooves 8631 extending in the left and right directions. The front and rear sides of the second turning plate 82 are respectively provided with a second sliding block 867 at a position close to the end of the right side, each second sliding block 867 is provided with a second guide shaft 8671 which extends far away from the second turning plate 82, and the second guide shafts 8671 are in sliding fit with a third sliding groove 8631 on a third guide rail 863. The third slide slot 8631 is closed at the right end, thereby defining a limit position for movement of the second flap 82.

The fourth guide rails 864 have two, which are respectively disposed on the front and rear sides of the smoke collecting plate 3 and near the left-side end of the second air inlet hole 32, and each of the fourth guide rails 864 is spaced apart from the third guide rail 863 on the corresponding side in the left-right direction. The opposite sides of the two fourth rails 864 are respectively provided with a fourth sliding groove 8641 extending in the left and right directions, and the thickness of the fourth sliding groove 8641 is adapted to the thickness of the second flap 82, thereby enabling the edge of the second flap 82 to be inserted into the fourth sliding groove 8641.

When the range hood works, the first driving mechanism 83 and the second driving mechanism 85 start to operate, and the first driving mechanism 83 pushes the first turning plate 81 covered at the first air inlet hole 31 to move leftwards until the left end part of the first turning plate 81 is abutted with the left end part of the first chute 8431; thereafter, the first driving mechanism 83 continues to operate, since the first turning plate 81 cannot move any further, the first connecting rod 832 turns upwards around the connection with the first output end 831 of the first driving mechanism 83 to drive the first turning plate 81 to turn upwards, and since the first turning plate 81 has moved a certain distance to the left at this time, when the first turning plate 81 turns upwards, the first turning plate 81 can be partially staggered from the position of the first air inlet hole 31 to increase the opening area of the first air inlet hole 31, and the first guide pillar 842 defines a path for turning the first turning plate 81; the second driving mechanism 85 pushes the second turning plate 82 covered at the second air inlet 32 to move to the right until the right end of the second turning plate 82 abuts against the right end of the third chute 8631; thereafter, the second driving mechanism 85 continues to operate, and since the second turning plate 82 cannot move any further, the second link 852 turns upwards around the connection with the second output end 851 of the second driving mechanism 85, driving the second turning plate 82 to turn upwards, and since the second turning plate 82 has moved a certain distance to the right at this time, when the second turning plate 82 turns upwards, the second turning plate 82 may be partially staggered from the position of the second air inlet 32, so as to increase the opening area of the second air inlet 32, and the second guide post 862 defines a path along which the second turning plate 82 turns, see fig. 1 and 3. Or only one of the flaps may be driven to act according to the cooking situation, see fig. 5 and 6.

When the range hood is closed, the first driving mechanism 83 and the second driving mechanism 85 are started to operate, the first driving mechanism 83 drives the first connecting rod 832 to act rightwards, and the first turning plate 81 is driven to turn downwards until the first turning plate is basically flush with the upper surface of the smoke collecting plate 3; thereafter, the first driving mechanism 83 continues to operate, and since the first flap 81 cannot be turned over again, the first link 832 pulls the first flap 81 to move rightward until the front end of the first flap 81 is inserted into the second chute 8441 and the first flap 81 completely covers the first air inlet hole 31; the second driving mechanism 85 drives the second connecting rod 852 to act leftwards to drive the second turning plate 82 to turn downwards until the second turning plate is basically flush with the upper surface of the smoke collecting plate 3; thereafter, the second driving mechanism 85 continues to operate, and since the second flap 82 cannot be turned any more, the second link 852 pulls the second flap 82 to move leftward until the front end of the second flap 82 is inserted into the fourth chute 8641 and the second flap 82 completely covers the second air inlet hole 32; at this time, the two turning plates seal the whole smoke collecting plate 3 and are integrated, see fig. 7 and 8. 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 filter screen 6 is arranged in the case 2 and below the fan system 4, the filter screen 6 is arranged at the inlet of the air duct 25, and before the air duct 25 accelerates the oil smoke, the filter screen 6 and the oil smoke can be fully contacted, so that a good filtering effect is realized. Referring to fig. 9, the filter screen 6 includes a filter screen body 61 having a reverse tapered shape with a small upper portion and a large lower portion, a mesh 62 is densely arranged on the filter screen body 61, an annular oil sump 63 is formed by extending the edge of the filter screen body 61 outward, and the outer edge of the oil sump 63 is bent upward and extends to the outside of the bottom end of the cabinet 2.

Through setting up the undercut filter screen 6 of undercut, can shorten the distance with fan system 4, be close to strong negative pressure district for when the oil smoke enters into, directly receive strong negative pressure effect, thereby improved the effect of induced drafting greatly. The air inlet on the flow field is smooth, the suction force of the range hood is not influenced, and the phenomenon of excessive oil fume leakage and suction leakage is avoided; the filter screen 6 is low in the lower periphery and high in the middle, so that the oil fume is concentrated during absorption, and the collection efficiency of the oil stains can be improved; in addition, the fume collecting depth is high, the fume is deeply absorbed without blocking, and the lower periphery of the filter screen 6 collects oil, so that the flow of the collected oil is convenient, the oil is more conveniently collected, and the dripping of oil drops is avoided.

The oil sump 63 located at the rear side of the filter screen body 61 is partially provided with an oil drip hole 64, an oil cup 7 is arranged below the rear side of the fume collecting hood 1, and the oil drip hole 64 is located above the oil cup 7, so that grease collected from the machine case 2, the fan system 4 and the filter screen 6 can be received in the oil sump 63 of the filter screen 6, and is dripped into the oil cup 7 from the oil drip hole 64 through the fume collecting plate 3 (the oil drip hole is also formed in the fume collecting plate 3), so as to avoid polluting a cooking bench or a cooker.

The inverted cone-shaped filter screen 6 can enable the negative pressure area to be more concentrated because an oil cup is not required to be arranged in the central area, the structure with the small upper part and the large lower part is beneficial to the effect of the cage smoke on the lampblack gas, so that the gas flow is concentrated at the inlet of the double air inlet channel fan at the upper end, and the lampblack absorbing effect is better.

Claims (8)

1. The utility model provides a range hood, includes collection petticoat pipe (1) and sets up quick-witted case (2) in collection petticoat pipe (1) top, 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), be formed with wind channel (25), its characterized in that in machine case (2): the air duct (25) is gradually reduced from bottom to top, a filter screen (6) is arranged at the bottom in the case (2) and at the inlet of the air duct (25), the filter screen (6) comprises a filter screen body (61) with a small upper part and a large lower part, and meshes (62) are densely distributed on the filter screen body (61); 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 move left and right and turn over relative to the smoke collecting plate (3) so as to open or close the first air inlet hole (31), and a second turning plate (82) which can move left and right and turn over relative to the smoke collecting plate (3) so as to open or close the second air inlet hole (32) are arranged above the smoke collecting plate (3);

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

the first driving mechanism (83) is provided with a first output end (831), a first connecting rod (832) is connected between the first driving mechanism (83) and the first turning plate (81), a first end of the first connecting rod (832) is rotationally connected with the first output end (831) of the first driving mechanism (83), a second end of the first connecting rod is rotationally connected to the first turning plate (81), and the first driving mechanism (83) drives the first end of the first connecting rod (832) to move in the left direction and the right direction.

2. The range hood of claim 1, wherein: the first guide mechanism (84) comprises a first guide rail (843) and a second guide rail (844), and the first guide rail (843) is provided with two guide rails which are respectively arranged at the front side and the rear side of the smoke collecting plate (3); the second guide rails (844) are arranged on the front side and the rear side of the smoke collecting plate (3) respectively, each first guide rail (843) and the corresponding second guide rail (844) are arranged at intervals in the left direction and the right direction, and the first turning plate (81) is in sliding fit with the first guide rail (843) and the second guide rail (844) respectively.

3. The range hood of claim 2, wherein: the opposite side surfaces of the two first guide rails (843) are respectively provided with a first sliding groove (8431) extending in the left-right direction, the front side and the rear side of the first turning plate (81) are respectively provided with a first sliding block (847) which is in sliding fit with the first sliding grooves (8431) at positions close to the left end, and each first sliding groove (8431) is closed at the left end; the opposite side surfaces of the two second guide rails (844) are respectively provided with a second sliding groove (8441) extending in the left-right direction, and the thickness of each second sliding groove (8441) is matched with the thickness of the first turning plate (81) so that the first turning plate (81) is inserted into the second sliding groove (8441).

4. The range hood of claim 1, wherein: the second driving mechanism (85) is provided with a second output end (851), a second connecting rod (852) is connected between the second driving mechanism (85) and the second turning plate (82), one end of the second connecting rod (852) is rotationally connected with the second output end (851) of the second driving mechanism (85), the other end of the second connecting rod is connected to the second turning plate (82), and the second driving mechanism (85) drives the second connecting rod (852) to move in the left direction and the right direction.

5. The range hood of claim 4, wherein: the second guide mechanism (86) comprises a third guide rail (863) and a fourth guide rail (864), and the third guide rail (863) is provided with two guide rails which are respectively arranged at the front side and the rear side of the smoke collecting plate (3); the four guide rails (864) are respectively arranged on the front side and the rear side of the smoke collecting plate (3), each fourth guide rail (864) and the third guide rail (863) on the corresponding side are arranged at intervals in the left direction and the right direction, and the second turning plate (82) is in sliding fit with the third guide rail (863) and the fourth guide rail (864).

6. The range hood of claim 5, wherein: the opposite side surfaces of the two third guide rails (863) are respectively provided with a third sliding groove (8631) extending in the left-right direction, the front side and the rear side of the second turning plate (82) are respectively provided with a second sliding block (867) which is in sliding fit with the third sliding grooves (8631) at the position close to the end part on the right side, and each third sliding groove (8631) is closed at the end part on the right side; the opposite side surfaces of the two fourth guide rails (864) are respectively provided with a fourth sliding groove (8641) extending in the left-right direction, and the thickness of each fourth sliding groove (8641) is matched with the thickness of the second turning plate (82) so that the second turning plate (82) is inserted into the fourth sliding groove (8641).

7. The range hood according to any one of claims 1 to 6, wherein: the edge of the filter screen body (61) outwards extends to form an annular oil collecting groove (63), and the outer edge of the oil collecting groove (63) extends to the outside of the bottom end of the chassis (2) and is bent upwards.

8. The range hood of claim 7, wherein: the oil collecting groove (63) positioned at the rear side of the filter screen body (61) is provided with an oil dropping hole (64).