CN109780600B

CN109780600B - Fume exhauster

Info

Publication number: CN109780600B
Application number: CN201711107836.1A
Authority: CN
Inventors: 梁雪斐; 周佳杰; 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: CN109780600A

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, and a fan system is arranged in the case, and the range hood is characterized in that: the fan system comprises a first ternary fan and a second ternary fan which are arranged in parallel, a first air inlet hole and a second air inlet hole which are arranged at intervals in the left direction and the right direction are formed in the smoke collecting plate, a first turning plate capable of movably opening or closing the first air inlet hole and a second turning plate capable of movably opening or closing the second air inlet hole are arranged above the smoke collecting plate. By arranging the movable turning plate, the air inlet holes are opened or closed, so that the two air inlet holes are respectively aimed at respective furnace ends on the kitchen range, the negative pressure area is fully utilized for centralized guiding, and the oil 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 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 collection cigarette board, the machine incasement is provided with fan system, its characterized in that: the fan system comprises a first ternary fan and a second ternary fan which are arranged in parallel, a first air inlet hole and a second air inlet hole which are arranged at intervals in the left direction and the right direction are formed in the smoke collecting plate, a first turning plate capable of movably opening or closing the first air inlet hole and a second turning plate capable of movably opening or closing the second air inlet hole are arranged above the smoke collecting plate.

Preferably, in order to reduce the space occupied by the turning plates and avoid mutual interference during movement, the first turning plates and the second turning plates move towards or away from each other in the left-right direction, and the first turning plates and the second turning plates are staggered up and down when moving towards the middle above the smoke collecting plate.

Preferably, the movement of the turning plate is guided by a sliding groove, a guide mechanism for guiding the movement of the first turning plate and the second turning plate is arranged above the smoke collecting plate, the guide mechanism comprises a first guide rail and a second guide rail which are respectively arranged at the front side and the rear side of the smoke collecting plate, and the first guide rail and the second guide rail respectively extend from the left side to the right side of the smoke collecting plate; the first guide rail and the second guide rail are respectively provided with a first chute and a second chute which extend in the left and right directions, the two first chutes correspond to each other and respectively extend from the left side to the middle of the smoke collecting plate, the two second chutes correspond to each other and respectively extend from the right side to the middle of the smoke collecting plate, the front end and the rear end of the first turning plate are respectively in sliding fit with the first chute, the front end and the rear end of the second turning plate are respectively in sliding fit with the second chute, and the two chutes at least partially overlap in the middle of the smoke collecting plate and are in up-down staggered arrangement.

In order to realize automatic movement of the first turning plate, the first guide rail is positioned at the rear side of the smoke collecting plate, the second guide rail is positioned at the front side of the smoke collecting plate, and a first driving mechanism for driving the first turning plate to move is further arranged at the rear side above the smoke collecting plate; the front end and the rear end of the first turning plate are respectively provided with a first pulley in sliding fit with the first sliding groove, and the first driving mechanism is arranged at the rear side of the first guide rail, so that the first driving mechanism and the first turning plate are respectively arranged at two sides of the first guide rail, and one of the first pulleys arranged at the rear end of the first turning plate is connected with the output end of the first driving mechanism through the corresponding first sliding groove.

Preferably, in order to avoid interference of the two turning plates when moving to the middle, each first sliding groove comprises a first extending part positioned at the left side of the smoke collecting plate and a second extending part positioned at the middle of the smoke collecting plate, wherein the second extending part is formed by extending to the right after being bent upwards obliquely from the right end part of the first extending part, and therefore the height of the second extending part is higher than that of the first extending part and the second sliding groove.

Preferably, in order to facilitate lifting of the first turning plate when moving to the middle, one of the first pulleys arranged at the rear end of the first turning plate is rotationally connected with the output end of the first driving mechanism through a connecting rod.

In order to realize the automatic movement of the second turning plate, the first guide rail is positioned at the rear side of the smoke collecting plate, the second guide rail is positioned at the front side of the smoke collecting plate, and a second driving mechanism for driving the second turning plate to move is further arranged at the front side above the smoke collecting plate; the front end and the rear end of the second turning plate are respectively provided with a second pulley in sliding fit with the second sliding groove, and the second driving mechanism is arranged on the front side of the second guide rail, so that the second driving mechanism and the second turning plate are respectively arranged on two sides of the second guide rail, and one of the second pulleys arranged at the front end of the second turning plate is connected with the output end of the second driving mechanism through the corresponding second sliding groove.

For on the basis of not changing the machine case size, increase the amount of wind, first ternary fan includes first ternary impeller and first air intake, the ternary fan of second includes second ternary impeller and second air intake, on the oil smoke flow path, second air intake is equal with first air intake position, first air intake and second air intake set up side by side to the left and right sides of quick-witted case respectively.

Preferably, in order to reduce wind resistance and improve the oil fume absorbing effect on the premise of not increasing the size of the case, the first ternary impeller of the first ternary fan and the second ternary impeller of the second ternary fan respectively form 60-90 degrees with the horizontal direction, and the two ternary impellers incline towards opposite directions.

According to one aspect of the invention, the first ternary fan further comprises a first volute, the first ternary impeller is arranged in the first volute, the second ternary fan further comprises a second volute, the second ternary impeller is arranged in the second volute, the first volute and the second volute are arranged at intervals and side by side, the first air inlet is formed in the first volute, the second air inlet is formed in the second volute, a first oil smoke channel is formed in the first volute, a first air outlet is formed at the top end of the first oil smoke channel, a second oil smoke channel is formed in the second volute, and a second air outlet is formed at the top end of the second oil smoke channel.

According to another aspect of the invention, the first ternary impeller and the second ternary impeller are arranged at intervals and side by side in the same volute, a first air inlet corresponding to the first ternary impeller and a second air inlet corresponding to the second ternary impeller are respectively formed at two opposite sides of the volute, a mounting plate is arranged between the first ternary impeller and the second ternary impeller and extends to the top end of the volute, so that the interior of the volute is divided into two independent first oil smoke channels and second oil smoke channels, the top end of each first oil smoke channel forms a first air outlet, and the top end of each second oil smoke channel forms a second air outlet.

In order to drive two impellers simultaneously, the device further comprises a driving motor arranged between the first ternary impeller and the second ternary impeller, and the driving motor is provided with double output shafts for driving the first ternary impeller and the second ternary impeller respectively.

For playing the guide effect to the gas of the corresponding export of two ternary fans, be favorable to the outlet gas to form laminar flow to reduce by a wide margin flow loss, raise the efficiency, fan system's air outlet department is provided with the air outlet cover, the air outlet cover is including being hollow tube-shape's cover body, the cover body has relative, open-ended first end and second end, the bore of first end is greater than the bore of second end, be provided with first guide plate and second guide plate in the cover body, every guide plate extends to the second end from the first end of cover body, form first diffusion runner between the inside wall of first guide plate and the cover body, form the second diffusion runner between the inside wall of second guide plate and the cover body, the cross-sectional area of first diffusion runner and second diffusion runner is reduced by the first end of the cover body to the second end respectively, first runner corresponds with the first air outlet of first ternary fan in the first end department of the cover body, the second diffusion runner corresponds with the second diffusion of second ternary fan in the first end department of the cover body.

Compared with the prior art, the invention has the advantages that: by arranging the movable turning plate, the air inlet holes are opened or closed, so that the two air inlet holes are respectively aimed at respective furnace ends on the kitchen range, the negative pressure area is fully utilized for centralized guiding, and the oil 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 mode of the turning plate reduces the installation space; by adopting two ternary fans, the structure of the fan is compact, the size is relatively small, the efficiency of the fan and the air pressure are high, the generated negative pressure gradient is large, and the smoking efficiency can be greatly improved; the parallel double fans are vertically arranged, the strongest negative pressure areas of the fan system are opposite to the air flows entering from the left side and the right side, and the double air inlet channels on the smoke collecting plate can enable the air flows entering from the lower side to enter the fan system from the areas with strongest negative pressures at the left side and the right side, so that the escape rate of oil smoke is reduced.

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;

fig. 7 is a cross-sectional view of a first embodiment of a fan system and an outlet hood of the range hood of the present invention;

fig. 8 is a schematic view of an outlet hood of the range hood of fig. 1;

fig. 9 is a schematic view of a fan system and a second embodiment of an outlet hood of the range hood of the present invention;

fig. 10 is a cross-sectional view of a fan system and an outlet hood of the range hood of fig. 9.

Detailed Description

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

Example 1

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 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 specific structure of the fan system 4 will be described in detail below.

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 movable with respect to the center of the smoke collecting plate 3, thereby independently opening and closing the corresponding air inlet holes. Inside the fume collecting chamber 13, at a position above the fume collecting plate 3, a first driving mechanism 83 for driving the first flap 81 to move, a second driving mechanism 85 for driving the second flap 82 to move, and a guiding mechanism 84 are provided. 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 guide mechanisms are provided on the upper surface of the smoke collecting plate 3.

The first driving mechanism 83 is provided at the rear side of the smoke collecting plate 3, and the second driving mechanism 85 is provided at the front side of the smoke collecting plate 3. Alternatively, the first driving mechanism 83 may be provided on the front side of the smoke collecting plate 3, and the second driving mechanism 85 may be provided on the front side of the smoke collecting plate 3. The first driving mechanism 83 and the second driving mechanism 85 are preferably electric push rods, and alternatively, other mechanisms capable of pushing the load to make linear reciprocating motion can be used.

The guiding mechanism 84 comprises a first guide rail 841 and a second guide rail 842, wherein the first guide rail 841 is located at the rear side of the smoke collecting plate 3 and the second guide rail 842 is located at the front side of the smoke collecting plate 3, the first guide rail 841 and the second guide rail 842 extending from the left side of the smoke collecting plate 3 to the right side of the smoke collecting plate 3, respectively.

The first rail 841 and the second rail 842 are each provided with a first chute 843 extending in the left-right direction, the two first chutes 843 correspond to each other, and each first chute 843 extends from the left side of the smoke collecting plate 3 to the middle of the smoke collecting plate 3. The first guide rail 841 and the second guide rail 842 are also provided with second sliding grooves 844 extending in the left-right direction, the two second sliding grooves 844 correspond to each other, and each second sliding groove 844 extends from the right side of the smoke collecting plate 3 to the middle of the smoke collecting plate 3. The first chute 843 and the second chute 844 of each side at least partially overlap in the middle of the collector plate 3, and the overlapping portions are arranged up and down.

The first flap 81 is located between the first rail 841 and the second rail 842, and both front and rear ends of the first flap 81 are provided with first pulleys 845 for sliding engagement with the first slide grooves 843, respectively. In the present embodiment, the front and rear ends of the first flap 81 are provided with two first pulleys 845, respectively, which are arranged at intervals. To avoid interfering with the movement of the first flap 81, the first driving mechanism 83 is disposed at the rear side of the first rail 841, that is, the first driving mechanism 83 and the first flap 81 are disposed at two sides of the first rail 841, respectively, so that the first chute 843 on the first rail 841 is a through slot.

A portion of each first chute 843 overlaps with the first air inlet holes 31 so that the first flap 81 may completely cover the first air inlet holes 31. Each first chute 843 comprises a first extension 8431 located on the left side of the upper surface of the smoke collecting plate 3, a second extension 8432 located in the middle of the upper surface of the smoke collecting plate 3, wherein the right end of the first extension 8431 is beyond the right end of the first air inlet hole 31 or at least flush with the right end of the first air inlet hole 31. The second extension portion 8432 is formed to extend rightward after being bent obliquely upward from the right end portion of the first extension portion 8431, whereby the height of the second extension portion 8432 is higher than the height of the first extension portion 8431. While the second runner 844 may always extend horizontally, corresponding to the height of the first extension 8431, so that the second runner 844 is located below the second extension 8432 of the first runner 843 at the overlapping portion of the first runner 843 and the second runner 844. Alternatively, the shapes of the first sliding groove 843 and the second sliding groove 844 are exchanged, that is, the first sliding groove 843 extends horizontally all the time, and the second sliding groove 844 has a horizontally extending part and an upwardly bending extending part.

The second flap 82 is located between the first rail 841 and the second rail 842, and both front and rear ends of the second flap 82 are provided with second pulleys 846 for sliding engagement with the second slide grooves 844, respectively. In this embodiment, the front and rear ends of the second flap 82 are respectively provided with two second pulleys 846 arranged at intervals. In order to avoid interfering with the movement of the second flap 82, the second driving mechanism 85 is disposed on the front side of the second rail 842, that is, the second driving mechanism 85 and the second flap 82 are disposed on two sides of the second rail 842, respectively, so that the second chute 844 on the second rail 842 is a through slot.

A portion of the second runner 844 on the second rail 842 overlaps the second air intake aperture 32 so that the second flap 82 may completely cover the second air intake aperture 32. The height of the second chute 844 can be the same as the height of the first extension 8431 of the first chute 843.

One of the first pulleys 845 provided at the rear end of the first flap 81 is rotatably connected to the output end of the first driving mechanism 83 through a link 86 so that the first flap 81 can also have an upward lifting action while moving. One of the second pulleys 846 provided at the front end of the second flap 82 is connected to the output end of the second driving mechanism 85.

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 move towards the middle of the smoke collecting plate 3 respectively. Since the first chute 843 has the second extension 8432 lifted upward, the first flap 81 can be lifted upward to be staggered from the second flap 82 when moving to the second extension 8432 until both flaps move to the middle of the smoke collecting plate 3 without having an overlapping portion with the respective air inlet holes, and the first air inlet hole 31 and the second air inlet hole 32 are completely opened, 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 in the middle are respectively moved to the left side and the right side of the smoke collecting plate 3 in a deviating way until the first turning plate and the second turning plate are respectively moved to cover the corresponding first air inlet hole 31 and the second air inlet hole 32, and the whole smoke collecting plate 3 is sealed and integrated, see fig. 5 and 6. Therefore, 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 the range hood is clean and tidy, is convenient to clean, and has obvious improvement effect on the air environment of a kitchen.

The moving mode of the turning plate reduces the installation space, can lead the two air inlet holes to respectively aim at the respective furnace heads on the kitchen range, fully utilizes the centralized guiding of the negative pressure area and improves the oil smoke absorbing 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.

Referring to fig. 2, 7 and 8, in the present embodiment, the fan system 4 preferably includes two independently operable first and second tertiary fans 41 and 42, which are disposed in parallel. By using the ternary impeller, compared with a centrifugal fan, the flow efficiency can be greatly increased, and the air quantity can be improved.

The first tertiary fan 41 includes a first scroll 411 and a first tertiary impeller 412 disposed within the first scroll 411, and the second tertiary fan 42 includes a second scroll 421 and a second tertiary impeller 422 disposed within the second scroll 421. The first volute 411 and the second volute 421 are arranged side by side at intervals, a first air inlet 413 is formed on the first volute 411, a second air inlet 423 is formed on the second volute 421, the air inlets of the two volutes are far away from each other, namely, the air inlet 313 of the first volute 411 is formed on one side far away from the second volute 421, the two volutes are arranged back to back, so that the two three-way fans are arranged side by side left and right, and the first air inlet 413 faces the left side of the case 2, and the second air inlet 423 faces the right side of the case 2. When the fume enters from the fume collecting hood 1, the fume enters into the fan system 4 from the left side and the right side respectively. A first oil smoke channel 441 is formed in the first volute 411, a first air outlet 414 is formed at the top end of the first oil smoke channel 441, a second oil smoke channel 442 is formed in the second volute 421, a second air outlet 424 is formed at the top end of the second oil smoke channel 442, and the first air outlet 414 and the second air outlet 424 are arranged side by side at intervals.

The first tertiary impeller 412 and the second tertiary impeller 422 may employ prior art techniques, such as those disclosed in applicant's application number 201620102790.9. The first and second three-way impellers 412 and 422 share the same driving motor 43, the driving motor 43 is disposed between the first and second volutes 411 and 421, and the driving motor 43 has a double output shaft, so that the output shaft 431 extending leftwards may be connected to the first three-way impeller 412 to drive the first three-way impeller 412 to operate, and the output shaft 431 extending rightwards may be connected to the second three-way impeller 422 to drive the second three-way impeller 422 to operate. Therefore, the two ternary fans have good synchronism, and meanwhile, energy sources can be saved.

The first and second three-way impellers 412 and 422 may respectively form 60 to 90 ° with the horizontal direction, and the two impellers are inclined in opposite directions (the first three-way impeller 412 is inclined to the left and the second three-way impeller 422 is inclined to the right), thereby reducing wind resistance and improving the oil fume absorbing effect. The center of the first ternary impeller 412 is kept at a certain distance from the inlet of the air duct 25 of the range hood, which is 1-2 times the diameter of the first ternary impeller 412, the center of the second ternary impeller 422 is kept at a certain distance from the inlet of the air duct 25 of the range hood, which is 1-2 times the diameter of the second ternary impeller 422, and the distance between the center of the impeller and the inlet of the air duct 25 must be greater than the diameter of the impeller, so that the filter screen 26 at the inlet of the air duct 25 can only work, but cannot be greater than 2 times the diameter, otherwise, the distance from the negative pressure area is too far.

The two ternary fans can adopt the same structure, and the overall size of the fan system is smaller in the arrangement mode, so that the original size of the case 2 is not changed, the air quantity can be doubled under the condition of keeping higher air pressure, and the oil fume suction efficiency is improved. The two air inlets face to the left and the right sides respectively, so that the area of the negative pressure areas at the periphery of the two sides is increased, the two air inlets are suitable for two cooking heads, and the effect of no smoke leakage is achieved; the noise propagation path is directed to the left and right sides, not toward the user as in the prior art, thereby reducing noise.

An air outlet cover 5 is arranged above the fan system 4, and a cover body 51 of the air outlet cover 5 covers a first air outlet 414 of a first volute 411 of the first ternary fan 41 and a second air outlet 424 of a second volute 421 of the second ternary fan 42 and are communicated. In this embodiment, the air outlet cover 5 includes a cover body 51 and a deflector disposed in the cover body 51. The hood 51 is hollow and cylindrical, and has opposite first and second ends 511 (lower and upper ends) and 512, the first end 511 having a larger diameter than the second end 512, i.e., the opening gradually decreases from a position closer to the fan system 4 to a position farther from the fan system 4, and the flow of soot enters the hood 51 from the first end 511 and exits the hood 51 from the second end 512 into an external duct connected to the exhaust hood 5.

The baffle includes a first baffle 521 and a second baffle 522, the first baffle 521 extends from the first end 511 to the second end 512 of the housing 51, and the first baffle 521 corresponds to a first edge 415 (a right edge of the first air outlet) of the first air outlet 414 of the first tertiary fan 41 near the second air outlet 424 of the second tertiary fan 42, at the first end 511 of the housing 51, and the second baffle 522 corresponds to a second edge 425 (a left edge of the second air outlet) of the second air outlet 424 of the second tertiary fan 42 near the first air outlet 414 of the first tertiary fan 41. Each baffle has a width extending in the front-to-rear direction. The first baffle 521 is gradually inclined toward the second baffle 522 (rightward) from the first end 511 to the second end 512, and the second baffle 522 is gradually inclined toward the first baffle 521 (leftward) from the first end 511 to the second end 512, i.e., each baffle extends from a position offset from the middle of the bottom of the casing 51 toward a position in the middle of the top of the casing 51. The top ends of the first baffle 521 and the second baffle 522 (near the second end 512 of the shroud 51) are connected to each other, and preferably, the connection between the two baffles is rounded, so as to guide the air flow to smoothly transition.

The front and rear side edges 5211, 5212 of the first baffle 521 are always connected to the inner side wall of the cover 51, and the front and rear side edges 5221, 5222 of the second baffle 522 are always connected to the inner side wall of the cover 51. The interior of the housing 51 is thus divided into a first diffusion flow passage 531 between the inner side wall of the housing 51 and the first baffle 521, and a second diffusion flow passage 532 between the inner side wall of the housing 51 and the second baffle 522, the first diffusion flow passage 531 and the second diffusion flow passage 532 being independent of each other. The first diffuser 531 corresponds to the first air outlet 414 of the first tertiary fan 41 at the first end 511 of the housing 51, i.e., completely covers the first air outlet 414, and the second diffuser 532 corresponds to the second air outlet 424 of the second tertiary fan 42 at the first end 511 of the housing 51, i.e., completely covers the second air outlet 424. The cross-sectional area of the first diffusion flow channel 531 gradually decreases from the first end 511 to the second end 512, and the cross-sectional area of the second diffusion flow channel 532 gradually decreases from the first end 511 to the second end 512, so that the outlet speed at the top of the first diffusion flow channel 531 is greater than the outlet speed at the bottom of the first diffusion flow channel 531, and the outlet speed at the top of the second diffusion flow channel 532 is greater than the outlet speed at the bottom of the second diffusion flow channel 532.

By providing the above-described baffle, the air flow speeds of the first diffuser 531 communicating with the first air outlet 414 of the first three-way fan 41 and the second diffuser 42 communicating with the second air outlet 424 of the second three-way fan 42 are made close to each other. The diversion effect of the air outlet cover 5 is beneficial to the formation of laminar flow of the outlet air, and the air enters the external pipeline after forming the laminar flow, so that the defect that the air flow directly enters the external pipeline in a turbulent state after exiting from the volute is avoided, and the strong friction and impact during the mixing of the air flows at the air outlets of the two three-way fans are also avoided, thereby greatly reducing the flow loss and improving the efficiency.

The sound absorbing holes 54 are densely distributed on the first baffle 521 and/or the second baffle 522, which is beneficial to reducing outlet noise. To further reduce noise, a partition 55 may be further provided in the space between the first and second baffles 521 and 522 such that the space between the first and second baffles 521 and 522 is partitioned into at least two resonant cavities 551. Alternatively, sound absorbing cotton may be provided in a space between the first baffle 521 and the second baffle 522. Alternatively, the baffle 55 may be replaced with a reinforcing rib to enhance the strength of the baffle.

The parallel double fans are vertically arranged, so that the strongest negative pressure area of the fan system 4 is opposite to the air flow entering from the left side and the right side, and the double air inlet channels on the smoke collecting plate 3 can enable the air flow entering from the lower side to enter the fan system 4 from the area with strongest negative pressure from the left side and the right side, and the escape rate of oil smoke is reduced.

Example two

Referring to fig. 9 and 10, in the present embodiment, the difference from the first embodiment described above is that the first tertiary fan 41 and the second tertiary fan 42 share the same volute 44, that is, the first tertiary impeller 412 of the first tertiary fan 41 and the second tertiary impeller 422 of the second tertiary fan 42 are disposed together in the same volute 44.

A mounting plate 45 is provided between the two three-way impellers so as to separate the two three-way impellers on both sides of the mounting plate 45, and the mounting plate 45 extends to the top end of the volute 44 so as to separate the interior of the volute 44 into two independent first oil smoke channel 441 and second oil smoke channel 442. The driving motor 43 passes through the mounting plate 45 and is fixedly connected with the mounting plate 45.

In the present embodiment, the air outlet cover 5 includes only the cover body 51 and the baffle 56 disposed in the cover body 51, the baffle 56 extends in the flow direction of the oil smoke, and in the present embodiment, the baffle 56 is located corresponding to the mounting plate 45 so as to partition the cover body 51 into the independent first diffuser 531 and the second diffuser 532 corresponding to the oil smoke passage in the volute 44.

Alternatively, the air outlet cover 5 may also adopt the structure of the first embodiment.

Claims

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 provided with fan system (4), its characterized in that in machine case (2): the fan system (4) comprises a first ternary fan (41) and a second ternary fan (42) which are arranged in parallel, a first air inlet hole (31) and a second air inlet hole (32) which are arranged at intervals in the left-right direction are formed in the smoke collecting plate (3), a first turning plate (81) capable of movably opening or closing the first air inlet hole (31) and a second turning plate (82) capable of movably opening or closing the second air inlet hole (32) are arranged above the smoke collecting plate (3);

the first turning plate (81) and the second turning plate (82) move towards each other or away from each other in the left-right direction, and the first turning plate (81) and the second turning plate (82) are staggered up and down when moving towards the middle above the smoke collecting plate (3);

the first ternary fan (41) comprises a first ternary impeller (412) and a first air inlet (413), the second ternary fan (42) comprises a second ternary impeller (422) and a second air inlet (423), on the oil smoke flow path, the second air inlet (423) is identical to the first air inlet (413) in position, and the first air inlet (413) and the second air inlet (423) are arranged in parallel and respectively face the left side and the right side of the case (2).

2. The range hood of claim 1, wherein: a guide mechanism (84) for guiding the first turning plate (81) and the second turning plate (82) to move is arranged above the smoke collecting plate (3), the guide mechanism (84) comprises two first guide rails (841) arranged on the front side of the smoke collecting plate (3) and two second guide rails (842) arranged on the rear side of the smoke collecting plate (3), and the first guide rails (841) and the second guide rails (842) respectively extend from the left side to the right side of the smoke collecting plate (3); first spout (843) that extend in left and right direction are all offered on left side first guide rail (841) and left side second guide rail (842), second spout (844) that extend in left and right direction are all offered on right side first guide rail (841) and right side second guide rail (842), two first spouts (843) correspond each other and extend to the centre from the left side of album board (3) respectively, two second spouts (844) correspond each other and extend to the centre from the right side of album board (3) respectively, the preceding, the back both ends of first board (81) respectively with first spout (843) sliding fit, the preceding, the back both ends of second board (82) respectively with second spout (844) sliding fit, two spouts that are located the front side overlap in the centre of album board (3) at least partially, two spouts that are located the back overlap in the centre of album board (3) at least partially.

3. The range hood of claim 2, wherein: the first guide rail (841) is positioned at the rear side of the smoke collecting plate (3), the second guide rail (842) is positioned at the front side of the smoke collecting plate (3), and a first driving mechanism (83) for driving the first turning plate (81) to move is further arranged at the rear side above the smoke collecting plate (3); the front end and the rear end of the first turning plate (81) are respectively provided with a first pulley (845) in sliding fit with a first chute (843), the first driving mechanism (83) is arranged on the rear side of the first guide rail (841), the first driving mechanism (83) and the first turning plate (81) are respectively arranged on two sides of the first guide rail (841), and one of the first pulleys (845) arranged at the rear end of the first turning plate (81) is connected with the output end of the first driving mechanism (83) through the corresponding first chute (843).

4. A range hood according to claim 3, wherein: each first sliding groove (843) comprises a first extending part (8431) positioned at the left side of the smoke collecting plate (3) and a second extending part (8432) positioned in the middle of the smoke collecting plate (3), and the second extending parts (8432) are formed by extending rightward after being bent upwards from the right end part of the first extending part (8431) in an inclined mode, and therefore the height of the second extending parts (8432) is higher than that of the first extending parts (8431) and the second sliding grooves (844).

5. The range hood of claim 4, wherein: one of the first pulleys (845) arranged at the rear end of the first turning plate (81) is rotationally connected with the output end of the first driving mechanism (83) through a connecting rod (86).

6. The range hood of claim 2, wherein: the first guide rail (841) is positioned at the rear side of the smoke collecting plate (3), the second guide rail (842) is positioned at the front side of the smoke collecting plate (3), and a second driving mechanism (85) for driving the second turning plate (82) to move is further arranged at the front side above the smoke collecting plate (3); the front end and the rear end of the second turning plate (82) are respectively provided with a second pulley (846) in sliding fit with a second sliding groove (844), and the second driving mechanism (85) is arranged on the front side of the second guide rail (842), so that the second driving mechanism (85) and the second turning plate (82) are respectively arranged on two sides of the second guide rail (842), and one of the second pulleys (846) arranged at the front end of the second turning plate (82) is connected with the output end of the second driving mechanism (85) through the corresponding second sliding groove (844).

7. The range hood of claim 1, wherein: the first ternary impeller (412) of the first ternary fan (41) and the second ternary impeller (422) of the second ternary fan (42) are respectively 60-90 degrees with the horizontal direction, and the two ternary impellers are inclined towards opposite directions.

8. The range hood of claim 1, wherein: the first ternary fan (41) further comprises a first volute (411), the first ternary impeller (412) is arranged in the first volute (411), the second ternary fan (42) further comprises a second volute (421), the second ternary fan (422) is arranged in the second volute (421), the first volute (411) and the second volute (421) are arranged at intervals and side by side, the first air inlet (413) is formed in the first volute (411), the second air inlet (423) is formed in the second volute (421), a first oil smoke channel (441) is formed in the first volute (411), a first air outlet (414) is formed in the top end of the first oil smoke channel (441), a second oil smoke channel (442) is formed in the second volute (421), and a second air outlet (424) is formed in the top end of the second oil smoke channel (442).

9. The range hood of claim 1, wherein: the first ternary impeller (412) and the second ternary impeller (422) are arranged at intervals and side by side in the same volute (44), a first air inlet (413) corresponding to the first ternary impeller (412) and a second air inlet (423) corresponding to the second ternary impeller (422) are respectively formed on two opposite sides of the volute (44), a mounting plate (45) is arranged between the first ternary impeller (412) and the second ternary impeller (422), the mounting plate (45) extends to the top end of the volute (44), so that the volute (44) is internally divided into two independent first oil smoke channels (441) and second oil smoke channels (442), the top end of each first oil smoke channel (441) forms a first air outlet (414), and the top end of each second oil smoke channel (442) forms a second air outlet (424).

10. A range hood according to claim 8 or 9, wherein: the motor (43) is arranged between the first ternary impeller (412) and the second ternary impeller (422), and the motor (43) is provided with double output shafts for driving the first ternary impeller (412) and the second ternary impeller (422) respectively.

11. A range hood according to claim 8 or 9, wherein: an air outlet cover (5) is arranged at an air outlet of the fan system (4), the air outlet cover (5) comprises a cover body (51) which is hollow and cylindrical, the cover body (51) is provided with a first end (511) and a second end (512) which are opposite and open, the caliber of the first end (511) is larger than that of the second end (512), a first guide plate (521) and a second guide plate (522) are arranged in the cover body (51), each guide plate extends from the first end (511) to the second end (512) of the cover body (51), a first diffusion flow channel (531) is formed between the first guide plate (521) and the inner side wall of the cover body (51), a second flow channel (532) is formed between the second guide plate (522) and the inner side wall of the cover body (51), the diffusion sectional areas of the first diffusion flow channel (531) and the second diffusion flow channel (532) are gradually reduced from the first end (511) to the second end (512) of the cover body (51) respectively, the diffusion sectional areas of the first diffusion flow channel (531) and the inner side wall of the first diffusion channel (51) are correspondingly reduced from the first end (511) to the second end (512) of the fan, the second diffusion flow passage (532) corresponds to the second air outlet (424) of the second ternary fan (42) at the first end (511) of the cover body (51).