CN114251704A - Range hood with air curtain - Google Patents

Abstract

The invention relates to a range hood with an air curtain, which comprises an outer shell, an inner shell, a smoke collecting hood, an oil smoke filter, an oil collecting tray, a smoke exhaust fan, a smoke exhaust air duct and a smoke exhaust air box.

Description

Range hood with air curtain

Technical Field

The invention belongs to the field of ventilation, and particularly relates to a range hood with an air curtain.

Background

The existing range hood usually adopts a filter plate and an eyelet mesh enclosure to filter oil smoke, and because the filter gap and the aperture are too large, the filter effect is not good, a large amount of oil dirt is easily accumulated, the cleaning is particularly difficult, the smoke collecting hood is higher away from a cooking bench, the smoke collecting effect is not good, the oil smoke is easy to diffuse, and the user experience is extremely poor.

Disclosure of Invention

The invention aims to provide a range hood with an air curtain, which adopts an oil smoke filter with fine pore diameter and has good oil smoke filtering effect, and a smoke collecting cover is provided with the air curtain and can prevent oil smoke from overflowing and diffusing, so that the smoke collecting effect is better.

The solution of the invention is: the range hood with air curtain includes outer casing, inner casing, fume collecting hood, fume filter,

An oil collecting tray, a smoke exhaust fan, a smoke exhaust duct and a smoke exhaust bellows are characterized in that an inner shell is fixed in a shell, an internal circulation duct is formed between the inner shell and the outer shell at an interval, the smoke collecting hood is positioned at the bottom of the shell and is provided with the internal circulation duct, an air duct air outlet of the internal circulation duct is arranged at the edge opening of the peripheral bottom of the smoke collecting hood, an oil smoke inlet is arranged between the inner shell and the outer shell of the smoke collecting hood, the oil collecting tray is arranged below the oil smoke inlet, an oil smoke filter is arranged below the oil smoke inlet and is placed on the oil collecting tray, the smoke exhaust duct enclosed by the outer shell and the inner shell is arranged above the oil smoke inlet, the smoke exhaust fan is arranged in the smoke exhaust duct, an air outlet of the smoke exhaust bellows is connected with the air inlet of the smoke exhaust fan, the outer shell and the inner shell are enclosed into the smoke exhaust bellows, the smoke exhaust bellows are positioned above the smoke exhaust duct and are provided with an air outlet of the smoke exhaust fan, the oil smoke outlet, the air inlet and an air door of the internal circulation duct, wherein the air door is arranged at the air inlet of the air duct.

When no oil smoke is cooked, the air inlet of the air duct is closed by the air door, and the cooking waste gas is exhausted to a flue or the outside through the oil smoke filter, the oil smoke inlet, the smoke exhaust air duct, the smoke exhaust fan, the smoke exhaust air box and the oil smoke outlet.

When cooking oil smoke, the air door opens the air inlet of the air channel, the cooking oil smoke waste gas is filtered by the oil smoke filter to become cooking waste gas without oil smoke, the cooking oil smoke enters the smoke exhaust air box through the oil smoke air inlet, the smoke exhaust air channel and the smoke exhaust fan, one part of the waste gas is exhausted to the flue or the outdoor from the oil smoke outlet, the other part of the waste gas enters the internal circulation air channel from the air inlet of the air channel, the waste gas is blown downwards from the air outlet of the smoke collecting hood, a closed three-side air curtain is formed between the upper part of a cooking bench and the wall surface, the cooking oil smoke is surrounded in the air curtain, the oil smoke is effectively prevented from overflowing and diffusing, and a better smoke collecting effect is achieved.

Drawings

FIG. 1 is a structural drawing of a range hood with internal circulation 1

FIG. 2 is a cross-sectional view of FIG. 1 taken along line 1-1

FIG. 3 is a cross-sectional view of FIG. 1 taken along line 2-2

FIG. 4 is a structural drawing of a range hood with internal circulation 2

FIG. 5 is a structural diagram of a range hood with fresh air in FIG. 1

FIG. 6 is a structural diagram of a range hood with fresh air 2

FIG. 7 is a cross-sectional view of FIG. 8 taken along line 3-3

FIG. 8 is a cross-sectional view of FIG. 8 taken along line 4-4

FIG. 9 is a cross-sectional view of FIG. 9 taken along line 5-5

Fig. 10 is a structural view of a range hood with fresh air 3

FIG. 11 is a cross-sectional view of FIG. 12 taken along line 6-6

FIG. 12 is a cross-sectional view of FIG. 12 taken along line 7-7

Fig. 13 is a structural view of a range hood with fresh air 4

FIG. 14 is a cross-sectional view of FIG. 15 taken along line 8-8

FIG. 15 is a cross-sectional view of FIG. 15 taken along line 9-9

Fig. 16 is a structure of a range hood with fresh air, fig. 5

FIG. 17 is a cross-sectional view of FIG. 18 taken along line 10-10

FIG. 18 is a cross-sectional view of FIG. 18 taken along line 11-11

FIG. 19 is a structural diagram of a range hood with mixed air

FIG. 20 is a structural diagram of a side-draft range hood with fresh air

FIG. 21 is a view showing the construction of an integrated range with fresh air

FIG. 22 is a structural diagram of a range hood with internal circulation and fresh air

Description of reference numerals:

1. an outer shell, 2, an inner shell, 3, an internal circulation air duct, 4, an air duct air inlet, 5, an air duct air outlet, 6, an air door, 7, an oil collecting tray, 8, 76, an oil smoke filter, 9, a hanging rod, 10, a smoke collecting hood, 11, an oil smoke air inlet, 12, a smoke exhaust air duct, 13, a smoke exhaust fan, 14, a smoke exhaust air box, 15, an oil smoke air outlet air valve, 16, a bracket, 17, 95, a fresh air duct, 18, a heat exchange fresh air valve, 19, a heat exchanger, 20, a heat exchange tube, 21, a heat exchanger oil smoke outlet, 22, 25, a fresh air fan, 23, 57, a fresh air valve, 24, a heat exchanger oil smoke inlet, 26, a fresh air inlet, 27, 30, 31, 32, 34, 36, 41, 46, 49, 59, 60, 81, 82, 86, 88, 89, 90, 91, a partition board, 28, a first fresh air chamber, 29, a second fresh air chamber, 33, a third fresh air chamber, 35, an outer shell, 37 and a fresh air channel, 38. fresh air inlet, 39, 40, fresh air cavity outlet, 42, smoke exhaust outlet cavity, 43, smoke exhaust fan suction chamber, 44, 58, 85, fresh air cavity outlet, 45, 82, fresh air cavity, 47, smoke exhaust valve, 48, smoke on-way partition board, 50, 87, 86, smoke exhaust inlet cavity, 51, fresh air inlet, 52, smoke outlet, 53, fresh air fan outlet, 54, fresh air fan suction chamber, 55, coaxial motor, 56, side guard board, 61, smoke exhaust cavity outlet, 62, fresh air outer cavity, 63, outer heat exchange board, 64, inner heat exchange board, 65, smoke exhaust cavity, 66, fresh air inner partition board, 67, fresh air inner cavity, 68, fresh air inner cavity inlet, 69, smoke exhaust cavity inlet, 70, partition board support, 71, fresh air cavity inlet, 72, fresh air inner cavity outlet, 73, smoke inlet, 74, smoke exhaust chamber, 75, smoke exhaust outlet, 77, air mixing valve, 78, and air mixing chamber, 79. 80 parts of a fresh air inlet of the air mixing chamber, an air outlet of the air mixing chamber, 89 parts of a heat exchange fresh air channel outlet, 93 parts of a negative pressure air supply valve, 94 parts of a heat exchange partition plate, 96 parts of an oil collecting tank.

Detailed Description

In figure 1, an inner shell 2 is fixed in an outer shell 1, the inner shell and the outer shell are separated to form an inner circulating air duct 3, one surface of the outer shell 1 of a rear back plate is a single-layer shell without the inner circulating air duct 3, a smoke collecting hood 10 is positioned at the bottom of the shell and is provided with the inner circulating air duct 3, an air duct air outlet 5 of the inner circulating air duct 3 is arranged at the edge opening of the peripheral bottom of the smoke collecting hood 10, an oil smoke inlet 11 is arranged between the inner shell 2 and the outer shell 1 of the smoke collecting hood 10, an oil collecting tray 7 is arranged below the oil smoke inlet 11, an oil smoke filter 8 is arranged below the oil smoke inlet 11 and is arranged on the oil collecting tray 7, a smoke exhaust air duct 12 enclosed by the outer shell 1 and the inner shell 2 is arranged above the oil smoke inlet 11, a smoke exhaust fan 13 is arranged in the smoke exhaust air duct 12, an exhaust opening of the smoke exhaust air box 14 is connected with the oil smoke inlet 11, the smoke exhaust air box 14 enclosed by the outer shell 1 and the inner shell 2 is positioned above the smoke exhaust air duct 12, an air outlet with a smoke exhaust fan 13, an air valve 15 of an oil smoke outlet, an air duct air inlet 4 of an internal circulation air duct 3 and an air door 6, wherein the air door 6 is arranged at the air duct air inlet 4. The range hood in the figure is of a top suction type, and the method is also suitable for a side suction type range hood and an integrated stove, but a smoke collecting hood 10 is required to be added.

When no oil smoke is cooked, the air valve 15 of the oil smoke outlet is fully opened, the smoke exhaust fan 13 runs at a low speed or a medium speed, the air door 6 closes the air inlet 4 of the air channel, and the cooking waste gas passes through the oil smoke filter 8, the oil smoke inlet 11, the smoke exhaust air channel 12, the smoke exhaust fan 13, the smoke exhaust air box 14 and the air valve 15 of the oil smoke outlet and is exhausted to a flue or outdoors.

When cooking oil smoke, an air valve 15 of an oil smoke outlet is half opened, a smoke exhaust fan 13 runs at a high speed, an air door 6 opens an air duct air inlet 4, the oil smoke cooking waste gas is filtered by an oil smoke filter 8 to become oil smoke-free cooking waste gas, the oil smoke cooking waste gas enters a smoke exhaust air box 14 through an oil smoke air inlet 11, a smoke exhaust air duct 12 and the smoke exhaust fan 13, one part of the waste gas is exhausted to a flue or the outside from the oil smoke outlet air valve 15, the other part of the waste gas enters an internal circulation air duct 3 from the air duct air inlet 4, the waste gas is blown downwards from an air duct air outlet 5 of a smoke collecting cover 10, a closed three-face air curtain is formed between the upper part of a cooking bench and a wall surface, the cooking oil smoke is surrounded in the air curtain, the oil smoke is effectively prevented from overflowing and diffusing, and a better smoke collecting effect is achieved. The air of the air curtain is sucked into the range hood by the smoke exhaust fan 13, one part is exhausted to the outdoor or the flue, and the other part participates in the internal circulation and flows into the air curtain, because the kitchen is in negative pressure, the air and the oil smoke of the air curtain can not be diffused to other rooms, people can not influence the respiration during cooking, when cooking by using gas, more harmful gas is contained in the oil smoke, and when cooking by using a kitchen range, less harmful gas is contained.

The air outlet direction of the air outlet 5 of the air duct is inwards deviated, so that the air is ensured to be inwards rolled without overflowing. The air door 6 can also be arranged at the air outlet 5 of the air duct. The air quantity and the air pressure are improved, the height of the air curtain is higher, the smoke collecting effect is better, and the smoke exhaust fan 13 adopts a three-speed or variable frequency fan. The air valve 15 of the oil smoke outlet adopts an electric control valve. The oil collecting tray 7 can be made of disposable materials, such as paper pulp and wood, is thrown away after being fully polluted with oil and replaced with new oil, does not need to be cleaned, has low cost, and has certain strength and fire resistance. The oil collecting tray 7 is hung on the smoke collecting hood 10 through a hanging rod 9, so that the oil smoke filter 8 is ensured not to leak oil smoke, and oil smoke particles are filtered out and then flow into the oil collecting tray 7 from the oil smoke filter 8.

In the figure 2, the oil fume filter 8 is round or square and is made of metal gauze, the mesh number of the gauze is preferably 7-35 meshes, the wire diameter is preferably less than 0.3 mm, three layers of metal gauzes are arranged in the figure, the pore diameter is smaller and smaller from the outer layer to the inner layer, so that oil fume particles are effectively intercepted, and the oil fume particles are adhered to the metal silk threads after contacting the metal silk threads, slide downwards and finally gather on the oil collecting tray 7. The number of layers of the metal gauze is one or more, the distance between each layer is preferably 1 mm to 5 mm, and the height of the metal gauze is preferably 80 mm to 150 mm. The pore diameter of the gauze is smaller than that of the prior grating type and pore plate type oil fume filter, and the metal gauze has better filtering effect because the number of layers is large. After long-term use, the metal silk thread can be stained with oil dirt to form blockage, oil smoke can not be discharged, the metal gauze is replaced by a new metal gauze because the metal gauze is low in cost and does not need to be cleaned and thrown away, and the metal gauze is compared and cleaned by an organic cleaning agent, so that the cost is higher than that of replacing the new metal gauze, and the cleaning is troublesome, and therefore, the metal gauze which is disposable is suitable for use. When the oil collecting tray 7 is made of disposable materials, in order to ensure that the oil collecting tray does not fall off, a bracket 16 is arranged below the oil collecting tray for supporting, the hanging rod 9 is fixedly connected with the bracket 16, the oil collecting tray 7 is placed on the bracket 16 and keeps stable, and the hanging rod 9 and the bracket 16 are preferably made of metal materials.

In fig. 3, one surface of the shell 1 of the back panel is a single-layer shell, and the internal circulation air duct 3 is not arranged, and the smoke exhaust fan 13 is fixed on the surface. One end of the air door 6 is hinged on the shell, and the other end is controlled by a pull rope which is controlled by a motor. When the air door 6 needs to be opened, the motor rolls up the pull rope, and one end of the air door 6 is lifted; when the air door 6 needs to be closed, the pull rope is lowered by the motor, the air door 6 descends by means of gravity and falls on the air inlet 4 of the air duct, and the air door control system is not limited to the control mode and can adopt other control modes.

In fig. 4, the oil fume filter 8 adopts three layers of V-shaped metal gauze, the upper end of the metal gauze is hung at the oil fume inlet 11, the inclination angle of the metal gauze is more than 45 degrees, oil drops are ensured to fall onto the oil collecting tray 7, and the oil fume filter 8 can also adopt three layers of inverted V-shaped metal gauze or other shapes.

In fig. 5, the range hood is provided with a heat exchanger 19, so that in winter, the temperature of outdoor fresh air is low, and when the range hood discharges oil fume, outdoor cold air is sucked indoors, so that the indoor temperature is reduced, meanwhile, the heat energy of the oil fume is discharged outdoors, the heat energy is not recycled, the energy is wasted, the heat energy of the oil fume can be used by the heat exchanger 19 to heat the outdoor cold air, the indoor temperature reduction is prevented, and the purpose of energy conservation is realized. The heat exchanger 19 comprises a heat exchange tube 20, a heat exchanger oil smoke outlet 21, a heat exchanger oil smoke inlet 24, a fresh air fan 22, a heat exchange fresh air valve 18 and a fresh air valve 23. The heat exchanger 19 is connected with the range hood separately or integrally, and is installed in the suspended ceiling of the kitchen, the oil smoke outlet of the range hood is connected with the oil smoke inlet 24 of the heat exchanger, the two air duct air inlets 4 of the range hood are respectively connected with the heat exchange fresh air valve 18 and the fresh air valve 23 of the heat exchanger 19, the internal circulation air duct 3 becomes the fresh air duct 17, and the heat exchange fresh air valve 18 and the fresh air valve 23 are electric valves or manual valves. The fresh air passes through the inside (or outside) of the heat exchange tube 20, the cooking waste gas flows through the outside (or inside) of the heat exchange tube 20, and the heat exchange tube 20 is preferably made of a stainless steel tube. The new fan 22 is a centrifugal fan or an axial flow fan, and adopts a variable speed fan, the maximum air volume of the variable speed fan is less than that of the smoke exhaust fan 13, so that the negative pressure is kept when the kitchen is cooked, and the oil smoke is prevented from diffusing to other rooms. The heat exchanger 19 may also be a plate heat exchanger or another type of heat exchanger, when the high-temperature oil smoke exhaust gas and the cold air are heat exchanged, condensed water and oil droplets are generated, and a condensed water pipe is provided and connected to the oil collecting tray 7. Outdoor fresh air should be subjected to dust removal and filtration to ensure the cleanness of the air curtain. The range hood in the figure is of a top suction type, the method is also suitable for a side suction type range hood and an integrated stove, but the smoke collecting hood 10 needs to be added, and a heat exchanger 19 in the integrated stove has enough space.

In summer or spring and autumn, heat exchange is not needed, when no oil smoke is cooked and an air curtain is not needed, the fresh air fan 22 is closed, the heat exchange fresh air valve 18 and the fresh air valve 23 are closed, the smoke exhaust fan 13 runs at a low speed or a medium speed, and cooking waste gas is exhausted to the outside or a flue through the oil smoke filter 8, the oil smoke air inlet 11, the smoke exhaust air duct 12, the smoke exhaust fan 13, the oil smoke inlet 24 of the heat exchanger, the outer pipe of the heat exchange pipe 20 and the oil smoke outlet 21 of the heat exchanger.

In summer or spring and autumn, heat exchange is not needed, when cooking oil smoke, the fresh air fan 22 is opened, the heat exchange fresh air valve 18 is closed, the fresh air valve 23 is opened, the smoke exhaust fan 13 runs at high speed, and the cooking oil smoke passes through the oil smoke filter 8, the oil smoke air inlet 11, the smoke exhaust air duct 12, the smoke exhaust fan 13, the oil smoke inlet 24 of the heat exchanger, the outside of the heat exchange tube 20 and the oil smoke outlet 21 of the heat exchanger and is exhausted to the outside or a flue. Outdoor fresh air passes through the fresh air fan 22, the fresh air valve 23, the air duct air inlet 4, the fresh air duct 17 and the air duct air outlet 5, and a closed three-side air curtain is formed between the upper part of the cooking bench and the wall surface.

In winter or spring and autumn, heat exchange is needed, no matter cooking without oil smoke or with oil smoke, the new air fan 22 is started, the new air heat exchange valve 18 is opened, the new air valve 23 is closed, and cooking waste gas passes through the oil smoke filter 8, the oil smoke air inlet 11, the smoke exhaust air duct 12, the smoke exhaust fan 13, the oil smoke inlet 24 of the heat exchanger, the outer pipe of the heat exchange pipe 20 and the oil smoke outlet 21 of the heat exchanger and is exhausted to the outside or a flue. Outdoor fresh air passes through the fresh air fan 22, the heat exchange tube 20, the heat exchange fresh air valve 18, the air duct air inlet 4, the fresh air duct 17 and the air duct air outlet 5, a closed three-side air curtain is formed between the upper part of the cooking bench and the wall surface, outdoor cold air and high-temperature oil smoke waste gas exchange heat in the heat exchange tube 20, the outdoor cold air is heated, and people do not feel cold air when cooking.

In fig. 6, 7, 8 and 9, the heat exchanger and the range hood are integrated, the heat exchange tube 20 is arranged in the heat exchanger shell 35 and positioned in the smoke exhaust duct 12, the heat exchange tube is arranged above the smoke inlet 11, the lower smoke inlet is communicated with the smoke inlet 11, the upper smoke outlet is communicated with the suction inlet of the smoke exhaust fan 13, and under the suction of the smoke exhaust fan 13, high-temperature smoke passes through the heat exchange tube 20. The fresh air inlet 38 of the heat exchanger is arranged at the smoke outlet at the upper part of the heat exchange tube 20, and the fresh air outlet of the heat exchanger is arranged at the smoke inlet at the lower part of the heat exchange tube 20. A first fresh air cavity 28 is defined by the outer shell 1 and the partition plate 27, a second fresh air cavity 29 is defined by the outer shell 1 and the partition plates 30 and 31, a third fresh air cavity 33 is defined by the outer shell 1, the partition plates 31 and 32 and the heat exchanger outer shell 35, a fresh air channel 37 is defined by the outer shell 1 and the partition plates 27 and 36, and a fresh air channel 17 is defined by the outer shell 1, the inner shell 2 and the partition plates 32 and 34. The inlet scoop of the fresh air blower 25 is connected with the outdoor fresh air inlet 26, and the first fresh air cavity 28 is provided with an air outlet of the fresh air blower 25, a fresh air inlet 38 of the heat exchanger and an air inlet of a fresh air channel 37. The fresh air channel 37 has an air inlet and an air outlet. The second fresh air cavity 29 is provided with an air outlet of a fresh air channel 37 and a fresh air valve 23. The third fresh air cavity 33 is provided with a fresh air valve 23, a heat exchange fresh air valve 18 and fresh air cavity air outlets 39 and 40. The fresh air duct 17 is provided with fresh air cavity air outlets 39 and 40 and an air duct air outlet 5. When the high-temperature oil smoke waste gas and the cold air are subjected to heat exchange, condensed water and oil drops are generated on the inner surface of the heat exchange tube 20 and flow into the oil collecting tray 7. The range hood in the figure is of a top suction type, and the method is also suitable for a side suction type range hood and an integrated stove, but a smoke collecting hood 10 is required to be added.

In summer or spring and autumn, heat exchange is not needed, when no oil smoke is available for cooking and no air curtain is needed, the fresh air fan 25 is closed, the heat exchange fresh air valve 18 and the fresh air valve 23 are closed, the smoke exhaust fan 13 runs at a low speed or a medium speed, and cooking waste gas is exhausted to the outside or a flue through the oil smoke filter 8, the oil smoke air inlet 11, the heat exchange tube 20 and the smoke exhaust fan 13.

In summer or spring and autumn, heat exchange is not needed, when cooking oil fume, the fresh air fan 25 is opened, the heat exchange fresh air valve 18 is closed, the fresh air valve 23 is opened, the smoke exhaust fan 13 runs at high speed, and the cooking oil fume is exhausted to a flue or outdoors through the oil fume filter 8, the oil fume air inlet 11, the heat exchange tube 20 and the smoke exhaust fan 13. Outdoor fresh air passes through the fresh air opening 26, the fresh air fan 25, the first fresh air cavity 28, the fresh air channel 37, the second fresh air cavity 29, the fresh air valve 23, the third fresh air cavity 33, the fresh air cavity air outlets 39 and 40, the fresh air duct 17 and the air duct air outlet 5, and a closed three-side air curtain is formed between the upper part of the cooking bench and the wall surface.

In winter or spring and autumn, heat exchange is needed, no matter cooking without oil smoke or with oil smoke, the fresh air fan 25 is started, the heat exchange fresh air valve 18 is opened, the fresh air valve 23 is closed, and cooking waste gas passes through the oil smoke filter 8, the oil smoke air inlet 11, the heat exchange tube 20, the smoke exhaust fan 13 and is exhausted to the outside or a flue. Outdoor fresh air passes through the fresh air opening 26, the fresh air fan 25, the first fresh air cavity 28, the heat exchanger fresh air inlet 38, the heat exchange tube 20 outside the tube, the heat exchange fresh air valve 18, the third fresh air cavity 33, the fresh air cavity air outlets 39 and 40, the fresh air duct 17 and the air duct air outlet 5 to form a closed three-side air curtain between the upper part of the cooking bench and the wall surface, the outdoor cold air and high-temperature oil smoke waste gas exchange heat in the heat exchange tube 20, the outdoor cold air is heated, and people have no cold air feeling during cooking.

In fig. 10, 11, 12, the heat exchanger and the range hood are integrated into a whole, the heat exchange tubes 20 are symmetrically arranged on both sides of the smoke exhaust duct 12, it can also adopt a plate heat exchanger, a smoke co-pass partition 48 is arranged at the smoke inlet 11, it makes the flow of smoke in the heat exchanger the same, a smoke exhaust air inlet cavity 50 is formed between the partition 49 and the inner shell 2, the smoke inlet at the lower end of the heat exchange tube 20 is connected with the smoke exhaust air inlet cavity 50, the smoke outlet at the upper end of the heat exchange tube 20 is positioned below the partition 41, a smoke exhaust air outlet cavity 42 is formed between the outer shell 1 and the partition 41, smoke flows in the same pass between the smoke exhaust air inlet cavity and the smoke exhaust air outlet cavity 43, and is discharged into the smoke flue by the smoke exhaust fan 13. The lower end of the smoke exhaust duct 12 is connected with a smoke inlet 11 connected with a smoke exhaust inlet cavity 50, and is provided with a smoke exhaust air valve 47 for season heat exchange conversion, preferably a manual valve, and the upper end of the smoke exhaust duct 12 is communicated with a smoke exhaust outlet cavity 42 and a smoke exhaust fan suction chamber 43. A fresh air chamber 45 is arranged in the middle of the range hood, on two sides of the smoke exhaust duct 12 and between the heat exchange tubes 20, the fresh air chamber 45 is enclosed by the partition plates 41 and 46 and the walls of the smoke exhaust duct 12, a fresh air port 44 is arranged on the fresh air chamber and blows towards the heat exchange tubes 20, the heat exchange tubes 20 are arranged around the fresh air port 44, fresh air blows through the upper ends of the heat exchange tubes 20 and flows out at the lower ends of the heat exchange tubes 20 to form a heat exchange fresh air channel in the heat exchanger, and the heated fresh air enters the fresh air duct 18 from an air inlet 51 of the fresh air duct and finally flows out from an air outlet 5 of the fresh air duct to form an air curtain. The fresh air blower 25 is arranged in a fresh air blower suction chamber 54, the suction inlet of the fresh air blower is connected with fresh air outside, and the air outlet 53 of the fresh air blower is connected with the fresh air chamber 45. Between the housing 1 and the partition plate 41, there are smoke outlets 52 with different widths, the width of the two sides is small, and the width of the front end is large, so as to keep the smoke resistance and flow path the same. The smoke exhaust fan 13 and the new fan 25 adopt coaxial motors 55, and one motor is provided with two fan impellers, so that the space is saved and the energy is saved. The maximum air quantity of the new fan 25 is smaller than that of the smoke exhaust fan 13, the kitchen is kept to be negative pressure during cooking, and oil smoke is prevented from diffusing to other rooms, so that air exhaust and fresh air supply are started as long as the coaxial motor 55 is started to form an air curtain no matter cooking without oil smoke or cooking with oil smoke, if the air curtain is not needed during cooking without oil smoke, an air valve can be installed at an air suction port or an air outlet of the new fan 25, and the air valve can be closed. The smoke exhaust fan 13 and the fresh air fan 25 are integrally or separately connected with the range hood, in order to reduce the vibration of the fans, the smoke exhaust fan 13 and the fresh air fan 25 are preferably fixed below a top plate of a kitchen, and the fans and the range hood are connected by metal hoses. The range hood in the figure is of a top suction type, and the method is also suitable for the integrated cooker, but the smoke collecting hood 10 is required to be added.

The heat exchange is not needed in summer or spring and autumn, and the smoke exhaust fan 13 and the new fan 25 run at low speed or medium speed when no oil smoke is cooked; when cooking oil fume is generated, the smoke exhaust fan 13 and the fresh air fan 25 operate at high speed. In both working conditions, the smoke exhaust air valve 47 needs to be opened, and cooking oil smoke or waste gas is exhausted to the outdoor or flue through the oil smoke filter 8, the oil smoke air inlet 11, the smoke exhaust air valve 47, the smoke exhaust air duct 12, the smoke exhaust air outlet cavity 42 and the smoke exhaust fan 13; outdoor fresh air passes through the fresh air fan 25, the fresh air fan air outlet 53, the fresh air chamber 45, the fresh air chamber air outlet 44, the heat exchange tube 20, the fresh air duct air inlet 51, the fresh air duct 17 and the air duct air outlet 5, and a closed three-side air curtain is formed between the upper part of the cooking bench and the wall surface. Because only a small amount of high-temperature oil smoke passes through the heat exchange tube 20, the fresh air cannot be heated.

When heat exchange is needed in winter or spring and autumn and cooking is carried out without oil smoke, the smoke exhaust fan 13 and the new fan 25 run at low speed or medium speed; when cooking oil fume is generated, the smoke exhaust fan 13 and the fresh air fan 25 operate at high speed. In both of these two conditions, the smoke exhaust air valve 47 needs to be closed, and cooking oil smoke or waste gas is exhausted to the outdoor or flue through the oil smoke filter 8, the oil smoke inlet 11, the smoke exhaust air inlet cavity 50, the heat exchange pipe 20, the smoke outlet 52, the smoke exhaust air outlet cavity 42 and the smoke exhaust fan 13. Outdoor fresh air passes through the fresh air fan 25, the fresh air fan air outlet 53, the fresh air chamber 45, the fresh air chamber air outlet 44, the heat exchange tube 20, the fresh air duct air inlet 51, the fresh air duct 17 and the air duct air outlet 5, a closed three-side air curtain is formed between the upper part of the cooking bench and the wall surface, outdoor cold air and high-temperature oil smoke waste gas exchange heat in the heat exchange tube 20, the outdoor cold air is heated, and people have no cold wind sense during cooking.

In fig. 13, 14 and 15, unlike fig. 10, a fresh air chamber air outlet 58 of the fresh air chamber 45 is opened at a back plate of the range hood at the rear end, and a fresh air valve 57 is opened at the front end of the fresh air chamber 45 and near a front panel of the range hood. When the fresh air valve 57 is closed, fresh air flows out of the air outlet 58 of the fresh air chamber, flows out of the heat exchange tube 20 from the back plate to the front panel, and forms a heat exchange fresh air channel in the heat exchanger; when the fresh air valve 57 is opened, the fresh air is directly blown to the front panel and is diffused to the fresh air duct 17, the resistance of the air is reduced due to the short circuit of the fresh air, the fan saves electricity, the fresh air cannot be heated in summer, and the air curtain effect is better. The side guard plates 56 are arranged on two sides of the smoke collecting hood 10, so that the depth of the smoke collecting hood 10 is increased and the smoke collecting hood is closer to a cooking bench, the front end parts of the two sides of the smoke collecting hood 10 are provided with the new air ducts 17 and extend downwards along the side guard plates 56, although the length of the air curtain is reduced, the height blown out by the air curtain is increased, and the smoke collecting effect is better due to the protection of the side guard plates 56. The range hood in the figure is of a top suction type, and the method is also suitable for the integrated cooker, but the smoke collecting hood 10 is required to be added.

The heat exchange is not needed in summer or spring and autumn, and the smoke exhaust fan 13 and the new fan 25 run at low speed or medium speed when no oil smoke is cooked; when cooking oil fume is generated, the smoke exhaust fan 13 and the fresh air fan 25 operate at high speed. Under both working conditions, the smoke exhaust air valve 47 and the fresh air valve 57 need to be opened, cooking oil smoke or waste gas passes through the oil smoke filter 8, the oil smoke air inlet 11, the smoke exhaust air valve 47, the smoke exhaust air duct 12, the smoke exhaust air outlet cavity 42 and the smoke exhaust fan 13 and is exhausted to the outdoor or a flue; outdoor fresh air passes through the fresh air fan 25, the fresh air fan outlet 53, the fresh air chamber 45, the fresh air valve 57, the fresh air duct inlet 51, the fresh air duct 17 and the air duct outlet 5, and a closed three-side air curtain is formed between the upper part of the cooking bench and the wall surface. Because only a small amount of high-temperature oil smoke passes through the inside and outside of the heat exchange tube 20, the fresh air cannot be heated.

When heat exchange is needed in winter or spring and autumn and cooking is carried out without oil smoke, the smoke exhaust fan 13 and the new fan 25 run at low speed or medium speed; when cooking oil fume is generated, the smoke exhaust fan 13 and the fresh air fan 25 operate at high speed. Under both working conditions, the smoke exhaust air valve 47 and the fresh air valve 57 need to be closed, and cooking oil smoke or waste gas passes through the oil smoke filter 8, the oil smoke air inlet 11, the smoke exhaust air inlet cavity 50, the heat exchange tube 20, the smoke exhaust air outlet cavity 42 and the smoke exhaust fan 13 and is exhausted to the outside or a flue. Outdoor fresh air passes through the fresh air fan 25, the fresh air fan air outlet 53, the fresh air chamber 45, the fresh air chamber air outlet 58, the heat exchange tube 20, the fresh air duct air inlet 51, the fresh air duct 17 and the air duct air outlet 5, a closed three-side air curtain is formed between the upper part of the cooking bench and the wall surface, outdoor cold air and high-temperature oil smoke waste gas exchange heat in the heat exchange tube 20, the outdoor cold air is heated, and people have no cold wind sense during cooking.

In fig. 16, 17 and 18, the heat exchanger is a flat heat exchanger, the shell 1 and the outer heat exchange plate 63 form a fresh air outer cavity 62, the outer heat exchange plate 63 and the inner heat exchange plate 64 form an oil smoke cavity 65, the inner heat exchange plate 64 and the fresh air inner partition plate 66 form a fresh air inner cavity 67, fresh air flows through the fresh air outer cavity 62 and the fresh air inner cavity 67, high temperature oil smoke flows through the oil smoke cavity 65, the two exchange heat through the outer heat exchange plate 63 and the inner heat exchange plate 64, and the heat exchanger is located on the front panel, the rear back panel, the two side panels, the top panel and the top of the smoke collecting hood of the range hood and is sequentially communicated. The fresh air fan 25 on the top of the top plate sends outdoor fresh air into the fresh air outer cavity 62 of the top plate, the fresh air enters the fresh air inner cavity 62 from the fresh air cavity air inlet 71 at the back plate, one part of the fresh air flows into the fresh air inner cavity 62 at the back plate, the top plate, the side plate and the front plate, the other part of the fresh air flows into the fresh air inner cavity 67 at the top of the back plate, the top plate, the side plate, the front plate and the smoke collecting hood through the fresh air inner cavity air inlet 68 and then collects the fresh air inner cavity air outlet 72, the air outlet penetrates through the oil smoke cavity 65 in a sealing mode, the fresh air enters the fresh air outer cavity 62 of the front plate, the last two fresh air flows into the fresh air duct 17 and is sprayed out from the air duct air outlet 5, and a closed air curtain is formed between the upper part of the cooking bench and the wall surface. The high temperature oil smoke passes through the oil smoke filter 8 and the oil smoke inlet 11, enters the oil smoke chamber 65 at the top of the smoke collecting hood 10 from the oil smoke chamber inlet 69, then flows into the oil smoke chamber 65 at the front panel, the side panel, the back panel and the top plate, exchanges heat with fresh air, finally flows out from the oil smoke chamber outlet 61, enters the exhaust fan suction chamber 43, and is exhausted to the outdoor or flue by the exhaust fan 13. When heat exchange is not needed, the smoke exhaust air valve 47 is opened, and cooking waste gas directly enters the smoke exhaust fan suction chamber 43 through the smoke exhaust air duct 12 and is exhausted to the outdoor or flue by the smoke exhaust fan 13. The inner heat exchange plate 64 is fixedly connected with the inner shell 2 through the partition plate support 70, the outer heat exchange plate 63 is fixedly connected with the outer shell 1 through the corresponding support, and the inner shell 2 and the top plate at the top of the smoke collecting hood 10 are movable, so that the oil dirt can be conveniently detached and cleaned. The range hood in the figure is of a top suction type, and the method is also suitable for a side suction type range hood and an integrated stove, but a smoke collecting hood 10 is required to be added.

The heat exchange is not needed in summer or spring and autumn, and the smoke exhaust fan 13 and the new fan 25 run at low speed or medium speed when no oil smoke is cooked; when cooking oil fume is generated, the smoke exhaust fan 13 and the fresh air fan 25 operate at high speed. In both working conditions, the smoke exhaust air valve 47 needs to be opened, cooking oil smoke or waste gas passes through the oil smoke filter 8, the oil smoke air inlet 11, the smoke exhaust air valve 47, the smoke exhaust air duct 12 and the smoke exhaust fan 13 and is exhausted to the outside or a flue; outdoor fresh air enters the fresh air inner cavity 62 through the fresh air fan 25, the fresh air outer cavity 62 and the fresh air cavity air inlet 71, one part of the fresh air flows into the back plate, the top plate, the side plate and the fresh air inner cavity 62 at the front panel, the other part of the fresh air flows into the back plate through the fresh air inner cavity air inlet 68, the top plate, the side plate, the front panel and the fresh air inner cavity 67 at the top of the smoke collecting hood, then the fresh air inner cavity air outlet 72 is collected and enters the front panel fresh air outer cavity 62, the last two fresh air flows into the fresh air duct 17 and is sprayed out from the air duct air outlet 5, and a closed three-side air curtain is formed between the upper part of the cooking bench and the wall surface.

When heat exchange is needed in winter or spring and autumn and cooking is carried out without oil smoke, the smoke exhaust fan 13 and the new fan 25 run at low speed or medium speed; when cooking oil fume is generated, the smoke exhaust fan 13 and the fresh air fan 25 operate at high speed. Under both working conditions, the smoke exhaust air valve 47 needs to be closed, cooking oil smoke or waste gas enters the oil smoke cavity 65 at the top of the smoke collecting hood 10 from the oil smoke cavity air inlet 69 through the oil smoke filter 8 and the oil smoke air inlet 11, then flows into the oil smoke cavity 65 at the front panel, the side panel, the back panel and the top plate, exchanges heat with fresh air, finally flows out from the oil smoke cavity air outlet 61, enters the smoke exhaust fan suction chamber 43, and is exhausted to the outdoor or a flue by the smoke exhaust fan 13. Outdoor fresh air enters the fresh air inner cavity 63 through the fresh air fan 25, the fresh air outer cavity 62 and the fresh air cavity air inlet 71, one part of the fresh air flows into the rear back plate, the top plate, the side plate and the fresh air inner cavity 62 at the front panel, the other part of the fresh air flows into the rear back plate, the top plate, the side plate, the front panel and the fresh air inner cavity 67 at the top of the smoke collecting hood through the fresh air inner cavity air inlet 68, then the fresh air is collected into the fresh air inner cavity air outlet 72 and enters the fresh air outer cavity 62 at the front panel, the last two fresh air flows into the fresh air duct 17 and is sprayed out from the air duct air outlet 5 to form a closed three-side air curtain between the upper part of the cooking bench and the wall surface, the outdoor cold air and the high-temperature oil smoke waste gas exchange heat at the heat exchange plate, the outdoor cold air is heated, and people do not have cold wind sense during cooking.

In fig. 19, a smoke discharging chamber 74 is provided with a smoke inlet 73 and a smoke outlet 75, a wind mixing chamber 78 is provided with a wind mixing chamber fresh air inlet 79 and a wind mixing chamber wind outlet 80, and a communicating port of the smoke discharging chamber 74 and the wind mixing chamber 78 is provided with a smoke filter 76 and a wind mixing valve 77. The air outlet of the smoke exhaust fan 13 is connected with the smoke inlet 73, and the smoke outlet 75 is connected with the outdoor or flue. The air suction inlet of the fresh air blower 25 is connected with a fresh air inlet 79 of the air mixing chamber, and the fresh air inlet 79 of the air mixing chamber is connected with fresh air outside. The air mixing valve 77, the smoke outlet 75 and the fresh air inlet 79 of the air mixing chamber are preferably provided with electric or manual adjusting air valves, the air quantity can be accurately adjusted, the air mixing valve 77 is opened and closed once during heat exchange in winter, and is not frequently used, and a manual adjusting valve is preferably adopted. The smoke exhaust fan 13 and the new fan 25 adopt a coaxial motor 55 or own motor, the maximum air quantity of the new fan 25 is smaller than that of the smoke exhaust fan 13, the air quantity of the discharged outdoor oil smoke waste gas is larger than that of the new air, and the negative pressure in a kitchen is ensured. When the high-temperature oil smoke waste gas and the outdoor cold air are mixed in the air mixing chamber 78 in winter, condensed water and oil drops are generated, and the condensed water and the oil drops are discharged into the oil collecting box through the connecting pipe. In the figure, the exhaust suction chamber 43 of the exhaust fan, the new fan suction chamber 54, the air mixing chamber 78 and the exhaust chamber 74 are integrally connected or can be separately connected, and various combination connection modes are provided, such as: the exhaust inlet of the smoke exhaust fan 13 can also be arranged at the position of the exhaust outlet 75, the air outlet is connected with the outside or the flue, and a part of high-temperature oil smoke waste gas can also enter the air mixing chamber 77 through the oil smoke filter 76 and the air mixing valve 77 under the suction of the fresh air fan 25, and is mixed with cold air and then is sent into the fresh air duct 17; or, the air suction inlet of the fresh air fan 25 is directly connected with outdoor fresh air, the air outlet is connected with the fresh air inlet 79 of the air mixing chamber, the air outlet 80 of the air mixing chamber is connected with the fresh air duct 17, and a part of high-temperature oil smoke waste gas can also enter the air mixing chamber 77 through the oil smoke filter 76 and the air mixing valve 77 by utilizing high-pressure air supply of the smoke exhaust fan 13 and is mixed with cold air and then is sent into the fresh air duct 17.

When heat exchange is not needed in summer, spring and autumn, the air mixing valve 77 is closed, high-temperature oil smoke waste gas is discharged into the smoke exhaust chamber 74 from the smoke exhaust fan 13 through the smoke inlet 73 and then is discharged to the outside or a flue from the smoke outlet 75, outdoor fresh air enters the air mixing chamber 78 from the fresh air inlet 79 of the air mixing chamber and then enters the fresh air suction chamber 54 from the air outlet 80 of the air mixing chamber, and is sent into the fresh air duct 17 by the fresh air fan 25, and a closed three-side air curtain is formed between the upper part of the cooking bench and a wall surface. When heat exchange is needed in winter, spring and autumn, the air mixing valve 77 is opened, high-temperature oil smoke waste gas is discharged into the smoke exhaust chamber 74 from the smoke exhaust fan 13 through the smoke inlet 73, one part of the high-temperature oil smoke waste gas is discharged into the outdoor or flue from the smoke outlet 75, the other part of the high-temperature oil smoke waste gas is sucked by the fresh air fan 25, filtered by the oil smoke filter 76, enters the air mixing chamber 78 from the air mixing valve 77, meanwhile, outdoor cold air also enters the air mixing chamber 78 from the fresh air inlet 79 of the air mixing chamber, the outdoor cold air is heated after the high-temperature oil smoke waste gas is mixed with the outdoor cold air, finally enters the fresh air fan suction chamber 54 from the air mixing chamber air outlet 80, and is sent into the fresh air duct 17 by the fresh air fan 25, a closed three-side air curtain is formed between the upper part of a cooking bench and the wall surface, so that people have no cold wind sense during cooking. Although a small amount of oil smoke waste gas is mixed in the air curtain, the oil smoke reaches the emission standard after being filtered, and the smoke exhaust fan 13 continuously circulates and discharges to prevent the oil smoke waste gas from diffusing indoors and not harming human breathing. The method does not need to install a heat exchanger, has simple structure and low cost, is easy to realize, and is suitable for top-suction type and side-suction type range hoods and integrated cookers.

In fig. 20, the range hood is of a side-draft type, the heat exchanger and the fresh air fan 25 are arranged on the air outlet of the exhaust fan 13, the range hood is provided with a smoke collecting hood 10, a fresh air duct 17 and an air duct air outlet 5, and a closed air curtain can be formed between the upper part of a cooking bench and a wall surface.

Fig. 21 shows an integrated stove, wherein the smoke exhaust fan 13 and the fresh air fan 25 adopt a coaxial motor 55, are arranged in a box body together with a heat exchanger, are provided with a smoke collecting hood 10 above a stove, are provided with a fresh air duct 17 and an air duct air outlet 5, and can form a closed air curtain between the upper part of the stove and a wall surface.

Fig. 22 is an improvement on the basis of fig. 1, a negative pressure air supply valve 93 and a new air duct 95 are added, the new air duct 95 is added on the periphery of the internal circulation air duct 3, the outer shell 1 and the heat exchange partition plate 94 form the new air duct 95, the heat exchange partition plate 94 and the inner shell 2 form the internal circulation air duct 3, the heat exchange partition plate 94 is arranged between the new air duct 95 and the internal circulation air duct 3, the negative pressure air supply valve 93 is communicated with the new air duct 95 and receives outdoor new air, and the new air duct 95 and the internal circulation air duct 3 share the air duct air outlet 5 along the lower edge of the smoke collecting hood 10. When the smoke exhaust fan 13 exhausts the oil smoke, the kitchen is in a negative pressure state, doors and windows of other rooms are closed, outdoor fresh air enters the fresh air duct 95 from the negative pressure air supply valve 93 under the action of the negative pressure, flows out from the air duct air outlet 5 of the smoke collection cover 10, and is exhausted outdoors by the smoke exhaust fan 13 along with the oil smoke. When cooking oil smoke or fresh air needs to be heated, an air curtain needs to be formed, the air door 6 is opened, a part of high-temperature oil smoke waste gas enters the internal circulation air channel 3 from the air channel air inlet 4, is subjected to heat exchange with cold air through the heat exchange partition plate 94, and is mixed with the fresh air at the air channel air outlet 5 and then is sprayed out to form the air curtain. An oil collecting groove 96 is arranged on the heat exchange partition 94 of the internal circulation air duct 3 of the smoke collecting hood 10 and the inner shell 2, condensed water and oil drops are condensed and are connected into the oil collecting tray 7. The inner shell 2 and the heat exchange partition plate 94 are fixedly supported on the outer shell 1. The method is suitable for top suction type and side suction type range hoods and integrated stoves.

The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention fall within the scope of the present invention.

Claims (8)

1. A fume exhauster with air curtain is composed of casing, internal circulating air channel, fume collecting hood with internal circulating air channel, fume collecting tray with internal circulating air channel, fume exhausting fan, fume exhausting channel and fume exhausting bellows, and features that said internal casing is fixed in said casing and has an internal circulating air channel, said fume collecting hood is arranged at bottom of casing and has an internal circulating air channel, an air channel outlet with internal circulating air channel is arranged at the edge of external bottom of fume collecting hood, an fume inlet is arranged between internal casing and external casing, said fume filter is installed at the position of fume inlet, said fume exhausting fan is enclosed by external casing and internal casing, and has an air outlet communicated with fume inlet, and a fume exhausting bellows enclosed by external casing and internal casing, The range hood is a top-suction type or side-suction type or integrated stove.

2. A fume exhauster with air curtain is composed of casing, internal casing, fresh air channel, fume collecting hood with fresh air channel, fume filter, oil collecting tray with air channel outlet, fume exhausting fan, fume exhausting channel and heat exchanger The air outlet of the smoke exhaust fan is connected with the oil smoke inlet of the heat exchanger, the two air inlets of the fresh air duct of the smoke exhaust fan are respectively connected with the heat exchange fresh air valve and the fresh air valve of the heat exchanger, the oil smoke filter adopts a metal gauze with one or more layers, the smoke exhaust fan and the fresh air fan adopt variable speed fans, the maximum air quantity of the fresh air fan is less than that of the smoke exhaust fan, outdoor fresh air passes through the fresh air fan, the fresh air valve, the fresh air duct and the air outlet of the air duct, or outdoor fresh air is blown out from the edge at the bottom of the fume collecting hood through the fresh air fan, the heat exchange tube inside (or outside), the heat exchange fresh air valve, the fresh air duct and the air duct air outlet, a closed three-side air curtain is formed between the upper part of a cooking bench and a wall surface, oil smoke is discharged from a smoke exhaust fan and is exhausted to the outdoor or a flue through an oil smoke inlet of a heat exchanger, the outside (or inside) of a heat exchange pipe and an oil smoke outlet of the heat exchanger, and the smoke exhaust fan is a top-suction type or a side-suction type or an integrated kitchen.

3. A range hood with an air curtain comprises an outer shell, an inner shell, a fresh air channel, a smoke collecting hood, an oil fume filter, an oil collecting tray, a smoke exhaust fan, a smoke exhaust channel, a heat exchanger and a fresh air fan, and is characterized in that the heat exchanger and the range hood are combined into a whole, a heat exchange tube of the heat exchanger is arranged in the smoke exhaust channel and is arranged above an oil fume air inlet, a lower smoke inlet is communicated with the oil fume air inlet, an upper smoke outlet is communicated with a smoke exhaust fan suction inlet, high-temperature oil fume passes through the heat exchange tube under the suction of the smoke exhaust fan, a fresh air inlet of the heat exchanger is arranged at the smoke outlet of the upper part of the heat exchange tube, a fresh air outlet of the heat exchanger is arranged at the smoke inlet of the lower part of the heat exchange tube, a first fresh air cavity is enclosed by the outer shell and a partition plate, a second fresh air cavity is enclosed by the outer shell and the partition plate, a third fresh air cavity is enclosed by the outer shell, the partition plate and the outer shell of the heat exchanger, a fresh air channel is enclosed by the outer shell and the partition plate, a fresh air channel is enclosed by an outer shell, an inner shell and a partition plate, an air suction port of the fresh air fan is connected with an outdoor fresh air port, a first fresh air cavity is provided with a fresh air fan air outlet, a heat exchanger fresh air inlet and a fresh air channel air inlet, the fresh air channel is provided with an air inlet and an air outlet, a second fresh air cavity is provided with a fresh air channel air outlet and a fresh air valve, a third fresh air cavity is provided with a fresh air valve, a heat exchange fresh air valve and a fresh air cavity air outlet, the fresh air channel is provided with a fresh air cavity air outlet and an air channel air outlet, a smoke collecting cover is positioned at the bottom of the shell and is provided with a fresh air channel enclosed by the outer shell and the inner shell, an oil collecting tray is arranged below the oil fume air inlet, an oil fume filter is arranged below the oil fume air inlet and is placed on the oil collecting tray, and a smoke exhaust air channel enclosed by the outer shell and the inner shell is arranged above the oil fume inlet, the smoke exhaust fan is arranged above the smoke exhaust air duct and the smoke outlet at the upper part of the heat exchange tube, the smoke exhaust filter adopts a metal gauze with one or more layers, the smoke exhaust fan and the new fan adopt variable speed fans, the maximum air quantity of the new fan is less than that of the smoke exhaust fan, outdoor new air passes through the new air port, the new fan, the first new air cavity, the new air channel, the second new air cavity, the new air valve, the third new air cavity, the new air cavity air outlet, the new air duct and the air duct air outlet, or the outdoor new air passes through the new air port, the new fan, the first new air cavity, the new air inlet of the heat exchanger, the outside of the heat exchange tube, the heat exchange new air valve, the third new air cavity, the new air cavity air outlet, the new air duct and the air duct air outlet, a closed three-side air curtain is formed between the upper part of the stove and the wall surface, and the smoke passes through the smoke exhaust filter, the smoke inlet, the inside of the heat exchange tube and the smoke exhaust fan and is exhausted to the outdoor flue or the air duct, the range hood is a top suction type or side suction type or integrated stove.

4. A fume exhauster with air curtain is composed of casing, internal casing, fresh air channel, fume collecting hood, fume filter, oil collecting tray, fume exhausting fan, fume exhausting channel, heat exchanger and fresh air machine, and features that said heat exchanger and fume exhauster are combined integrally, said heat exchanger is symmetrically arranged at both sides of fume exhausting channel, and has a fume-passing partition plate at fume inlet and fume exhausting inlet, a fume exhausting inlet cavity is formed between partition plate and fume collecting hood, the fume inlet at lower end of heat exchange tube is connected to fume exhausting inlet cavity, the fume outlet at upper end of heat exchange tube is under partition plate and connected to fume exhausting outlet cavity, and a fume exhausting cavity is formed between casing and partition plate for allowing fume to flow in same direction The exhaust fan has exhaust chamber communicated, new air chamber with new air port to the heat exchange pipe and heat exchange pipe around the new air port, and new air flowing through the heat exchange pipe and out of the new air channel to form new heat exchange passage, and the new air blower inside the exhaust chamber with exhaust port connected to the new air outside and air outlet connected to the new air chamber, smoke outlet with different width between the casing and the partition board, small width on two sides and large width in the front end to maintain the same smoke resistance and flow path, smoke collecting hood in the bottom of the casing and with new air channel comprising casing and inner casing, air inlet of the new air channel communicated with the new air channel, air outlet of the new air channel in the bottom of the smoke collecting hood, and coaxial motor for the exhaust fan and the new air blower, one motor is provided with two fan impellers, the smoke exhaust fan and the new fan adopt variable speed fans, the maximum air quantity of the new fan is less than that of the smoke exhaust fan, the smoke exhaust fan and the new fan are integrally or separately connected with the range hood, an oil collecting disc is arranged below an oil smoke air inlet, an oil smoke filter is arranged below the oil smoke air inlet and placed on the oil collecting disc and adopts a metal gauze with one layer or multiple layers, outdoor new air passes through the new fan, the air outlet of the new fan, the new air chamber, the new air port, the outside of a heat exchange pipe, the air inlet of a new air channel, the new air channel and the air outlet of the air channel on the upper portion of a cooking bench and a wall surface to form a closed three-side air curtain, and the oil smoke passes through the oil smoke filter, the oil smoke air inlet, the smoke exhaust air valve, the smoke exhaust air channel, the smoke exhaust air outlet cavity and the smoke exhaust fan or passes through the oil smoke filter, the oil smoke inlet, the oil smoke filter, the oil smoke exhaust air outlet, the oil smoke filter, the oil filter, the new air inlet, the oil filter, and the oil filter, the smoke exhaust air inlet cavity, the heat exchange tube tubes, the smoke exhaust air outlet cavity and the smoke exhaust fan are exhausted to the outdoor or a flue, and the smoke exhaust fan is a top suction type or integrated stove.

5. A fume exhauster with air curtain is composed of external casing, internal casing, fresh air channel, fume collecting hood, fume filter, oil collecting tray, fume exhausting fan, fume exhausting channel, heat exchanger, fresh air fan and side protecting plate The new wind chamber is arranged on two sides of the smoke exhaust duct and between the heat exchange tubes, a partition plate and the wall of the smoke exhaust duct enclose the new wind chamber, the air outlet of the new wind chamber is arranged on the back plate of the range hood at the rear end, the front end of the new wind chamber and the position close to the front plate of the range hood are provided with new wind valves, when the new wind valves are closed, the new wind flows out from the air outlet of the new wind chamber and flows out of the heat exchange tubes from the back plate to the front plate, a heat exchange new wind channel is formed in the heat exchanger, when the new wind valves are opened, the new wind blows to the front plate and diffuses to the new wind channel, the new fan is arranged in the air suction chamber of the new fan, the air suction inlet is connected with the outdoor new wind, the air outlet of the new fan is connected with the new wind chamber, the smoke collecting hood is arranged at the bottom of the shell and is provided with the new wind channel enclosed by the outer shell, the air inlet of the new wind channel is arranged at the edge of the outer bottom of the smoke collecting hood, and the side guard plates are arranged on two sides of the smoke collecting hood, the smoke collecting hood has two side wind channels extending downwards along the side protecting boards, the smoke exhausting fan and the new fan are coaxial motors, one motor has two fan impellers, the smoke exhausting fan and the new fan are variable speed fans, the maximum wind rate of the new fan is less than that of the smoke exhausting fan, the smoke exhausting fan and the new fan are connected to the smoke exhausting fan integrally or separately, the oil collecting tray is set below the smoke inlet, the smoke filter is set below the smoke inlet and on the oil collecting tray, the smoke filter is metal gauze with one or more layers, and the outdoor fresh wind passes through the new fan, the new fan outlet, the fresh wind chamber, the fresh wind port, the heat exchange pipe, the fresh wind channel inlet, the fresh wind channel and the wind channel outlet, or passes through the new fan, the new fan outlet, the fresh wind chamber, the fresh wind valve, the fresh wind channel inlet, the fresh wind channel outlet, the fresh wind channel, The air channel air outlet forms a closed three-side air curtain between the upper part of the cooking bench and the wall surface, oil smoke passes through the oil smoke filter, the oil smoke air inlet, the smoke exhaust air valve, the smoke exhaust air channel, the smoke exhaust air outlet cavity and the smoke exhaust fan, or passes through the oil smoke filter, the oil smoke air inlet, the smoke exhaust air inlet cavity, the heat exchange tube, the smoke exhaust air outlet cavity and the smoke exhaust fan and is exhausted to the outdoor or a flue, and the range hood is a top-suction type or an integrated kitchen range.

6. A range hood with an air curtain comprises an outer shell, an inner shell, a fresh air duct, a smoke collecting hood, an oil fume filter, an oil collecting tray, a smoke exhaust fan, a smoke exhaust duct, a heat exchanger, a fresh air fan and side protection plates, and is characterized in that the heat exchanger and the range hood are combined into an integrated whole machine, the heat exchanger is symmetrically arranged on two sides of the smoke exhaust duct, the range hood is provided with an inner heat exchange plate and an outer heat exchange plate, the outer shell and the outer heat exchange plate form a fresh air outer cavity, the outer heat exchange plate and the inner heat exchange plate form an oil fume chamber, the inner heat exchange plate and a fresh air inner partition plate form a fresh air inner cavity, fresh air flows through the fresh air outer cavity and the fresh air inner cavity, high-temperature oil fume flows through the oil fume chamber, the outer heat exchange plate and the inner heat exchange plate exchange heat, the heat exchanger is positioned on the front panel, the rear panel, the two side panels, the top panel and the top of the smoke collecting hood are sequentially communicated, the lower end of the smoke exhaust duct is connected with an oil fume inlet, and is equipped with a smoke exhaust air valve, the upper end of the smoke exhaust air channel is communicated with the air outlet of the smoke exhaust cavity and the air suction chamber of the smoke exhaust fan, the new fan is installed in the air suction chamber of the new fan, the air suction inlet is connected with the outdoor new air, the air outlet of the new fan is connected with the outer fresh air cavity of the top plate, the smoke collecting hood is positioned at the bottom of the shell and is provided with a new air channel enclosed by the outer shell and the inner shell, the air inlet of the new air channel is communicated with the outer fresh air cavity, the edge opening of the peripheral bottom of the smoke collecting hood is provided with an air channel air outlet of the new air channel, the top of the smoke collecting hood is provided with a smoke exhaust air inlet, a smoke exhaust air channel, a smoke exhaust cavity and a new air cavity, the two sides of the smoke collecting hood are provided with side guard plates, the front end parts of the two sides of the smoke collecting hood are provided with new air channels and extend downwards along the side guard plates, the smoke exhaust fan and the new fan are provided with coaxial motors, one motor is provided with two fan impellers, the smoke exhaust fan and the new fan is provided with a variable speed fan, the maximum air quantity is less than the maximum of the smoke exhaust fan, the smoke exhaust fan and the fresh air fan are integrally or separately connected with the range hood, an oil collecting tray is arranged below the smoke inlet, the smoke filter is arranged below the smoke inlet and is placed on the oil collecting tray, the smoke filter adopts a metal gauze, the number of layers is one or more, the fresh air fan positioned at the upper part of the top plate sends outdoor fresh air into a fresh air outer cavity of the top plate, the fresh air enters the fresh air inner cavity from the fresh air cavity inlet at the back plate, one part of the fresh air flows into the fresh air inner cavity at the back plate, the top plate, the side plate and the front plate, the other part of the fresh air flows into the fresh air inner cavity at the top part of the back plate, the top plate, the side plate, the front plate and the fresh air cavity through the fresh air cavity inlet, then the fresh air is collected to a fresh air inner cavity outlet, the air outlet passes through the smoke cavity in a sealed mode, so that two fresh air flows into the fresh air outer cavity at the front plate, finally, the fresh air flows into a fresh air channel and is sprayed out from the air outlet of the air channel, and a sealed three-side air curtain is formed between the upper part of the range and the wall surface, the high-temperature oil smoke enters the oil smoke cavity at the top of the smoke collecting hood from the oil smoke cavity air inlet through the oil smoke filter and the oil smoke air inlet, then flows into the oil smoke cavity at the front panel, the side panel, the back panel and the top plate, exchanges heat with fresh air, finally flows out of the oil smoke cavity air outlet, enters the exhaust fan air suction chamber, and is exhausted to the outdoor or the flue by the exhaust fan, or the oil smoke waste gas enters the exhaust fan air suction chamber through the oil smoke filter, the oil smoke air inlet, the exhaust fan valve and the exhaust flue, and is exhausted to the outdoor or the flue by the exhaust fan, and the range hood is a top suction type or an integrated stove.

7. A cooker hood with air curtain is composed of casing, internal casing, fresh air channel, fume collecting hood, fume filter, oil collecting box, fume exhausting fan, fume exhausting channel, fresh air fan, fume exhausting chamber, air mixing chamber and air mixing valve The smoke exhaust fan is connected with the smoke inlet or the smoke outlet of the smoke exhaust chamber, the fresh air fan is connected with the fresh air inlet or the air outlet of the air mixing chamber, the smoke exhaust fan, the fresh air fan, the smoke exhaust chamber, the air mixing chamber and the shell of the range hood are integrally or separately connected, the smoke filter adopts a metal gauze with one or more layers, the smoke exhaust fan and the fresh air fan adopt a variable speed fan, the maximum air quantity of the fresh air fan is less than that of the smoke exhaust fan, the outdoor fresh air passes through the air mixing chamber, the fresh air fan, the fresh air duct and the air outlet of the air duct, or the outdoor fresh air and a part of smoke exhaust gas pass through the air mixing chamber, the fresh air fan, the fresh air duct and the air outlet of the air duct to be blown out from the edge opening at the bottom of the smoke collecting hood, a closed three-side air curtain is formed between the upper part of a kitchen range table and the wall surface, and the smoke exhaust gas passes through the smoke exhaust filter, the smoke inlet, the smoke exhaust duct and the smoke exhaust fan, The smoke exhaust chamber exhausts to the outside or a flue, and the range hood is a top suction type or a side suction type or an integrated stove.

8. A cooker hood with air curtain is composed of external shell, internal circulating air channel, fume collecting hood, fume filter, oil collecting tray, fume exhausting fan, fume exhausting channel, fume exhausting bellows, heat exchanging partition board, negative-pressure air supplementing valve and new air channel, and features that said external shell and heat exchanging partition board constitute new air channel, said heat exchanging partition board and internal shell constitute internal circulating air channel, a heat exchanging partition board is arranged between new air channel and internal circulating air channel, negative-pressure air supplementing valve is connected to new air channel and connected to outdoor new air, said new air channel and internal circulating air channel share air channel outlet at lower edge of fume collecting hood, said internal shell and heat exchanging partition board are fixed to external shell, said fume collecting hood has internal circulating air channel and new air channel, said internal circulating air channel and air channel outlet are arranged at bottom edge of fume collecting hood, said oil collecting tray is installed under fume inlet, and fume filter is installed at oil fume inlet and on oil collecting tray, the smoke exhaust fan is arranged in the smoke exhaust duct, the exhaust outlet of the smoke exhaust fan is connected with a smoke exhaust bellows, the exhaust inlet of the smoke exhaust fan is communicated with the smoke inlet, the outer shell and the inner shell are enclosed into the smoke exhaust bellows, the smoke exhaust fan is provided with an exhaust outlet of the smoke exhaust fan, a smoke exhaust outlet, a duct air inlet of an internal circulation duct and an air door, wherein the air door is arranged at the air inlet of the duct, the air valve is arranged at the smoke outlet, the smoke exhaust filter adopts a metal gauze with one or more layers, the smoke exhaust fan adopts a variable speed fan, a part of high-temperature smoke exhaust gas is exhausted from the smoke exhaust outlet to the outside or a flue, a part of high-temperature smoke exhaust gas enters the internal circulation duct through the air door and the duct air inlet, outdoor cold air enters a new duct from a negative pressure air supplement valve, the high-temperature smoke exhaust gas and outdoor cold air exchange heat through a heat exchange clapboard, and are mixed at the bottom of the smoke collecting hood and then are blown out from the duct air outlet, a closed three-side air curtain is formed between the upper part of the cooking bench and the wall surface, and the range hood is a top-suction type or side-suction type or integrated stove.

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