Oil smoke purification and heat recovery integrated exhaust hood

Abstract

The utility model relates to an oil smoke purification and heat recovery integrated exhaust hood which comprises a vapor-liquid separation unit, a smoke channel unit, a purification unit, a fan unit, a heat recovery unit and an external water tank. And the smoke channel unit can be used for communicating the oil smoke suction inlet of the gas-liquid separation unit with the fan unit. The heat recovery unit comprises an evaporator and a condenser, and a compressor and an expansion valve are arranged on a heat exchange medium pipe connecting pipeline of the evaporator and the condenser. And a heat exchange medium pipe of the evaporator is arranged in the flue gas channel. The condenser adopts a heat exchange mode of refrigerant and water exchange, is provided with a water inlet and a water outlet, and is connected with an external water tank through a pipeline. According to the utility model, the waste heat of kitchen flue gas can be recycled, the hot water requirement in kitchen activities can be met, and the purposes of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen exhaust hoods, in particular to an exhaust hood integrated with oil fume purification and heat recovery. Background Art

[0002] Existing kitchen fume exhaust systems often incorporate a fan unit attached to the exhaust hood. The fan's suction draws the generated fume into the hood's vapor-liquid separation unit. After separation, the fume is then directed through a fume duct and discharged outdoors. Some fume hoods also purify the fume as it flows through the duct before being discharged outdoors.

[0003] The large amount of cooking fumes generated during kitchen operations has a high temperature and is a high-temperature heat source. Existing kitchen exhaust hoods lack heat recovery mechanisms and simply exhaust the high-temperature fumes outdoors, resulting in a certain degree of energy waste. In daily life and business operations, kitchen activities require a large amount of hot water, which is currently produced by electric water heaters or gas-fired wall-mounted boilers, with a few using solar-powered electric water heaters. Therefore, the production of hot water requires additional electricity to meet this demand.

[0004] Statistics show that the energy utilization rate of ordinary stoves is around 55%-60%, and a large amount of heat energy is discharged to the outside through the exhaust hood, resulting in waste. How to fully recycle the waste heat of kitchen smoke, improve the utilization rate of kitchen energy, and enhance kitchen energy efficiency is of great practical significance. Utility Model Content

[0005] The utility model provides an integrated exhaust hood with oil fume purification and heat recovery, which can recycle the heat of kitchen smoke to meet the hot water demand in kitchen activities, help to fully utilize the kitchen's thermal energy, and help to improve the energy efficiency of the kitchen.

[0006] The technical solution adopted by the present invention to solve its technical problems is: an exhaust hood with integrated oil fume purification and heat recovery, comprising a vapor-liquid separation unit located in the lower portion of the exhaust hood, a flue gas duct unit, a purification unit, and a fan unit located in the upper portion of the exhaust hood; a heat recovery unit, and an external water tank. The heat recovery unit is located in the middle of the flue gas duct arrangement path of the flue gas duct unit and upstream of the fan unit. The purification unit is located in the flue gas duct path and upstream of the heat recovery unit. The purification unit includes an electrostatic adsorption assembly.

[0007] A cover plate is provided at the oil fume intake port of the vapor-liquid separation unit. Slots are distributed on the cover plate, allowing generated oil fume to flow toward the oil fume intake port through the slots. One end of the smoke channel in the smoke channel unit is connected to the oil fume intake port of the vapor-liquid separation unit, and the other end is connected to the intake port of the fan unit. An exhaust pipe is provided at the exhaust port of the fan unit. A smoke output pipe is connected to the exhaust pipe to discharge the smoke outdoors. The suction force generated by the fan unit during operation creates a suction force at the oil fume intake port of the vapor-liquid separation unit, drawing generated oil fume / steam into the vapor-liquid separation unit. After gas-liquid separation, the smoke flows through the smoke channel toward the fan unit and is ultimately discharged outdoors. While flowing through the smoke channel, the smoke comes into contact with a heat recovery unit, which recovers the waste heat from the smoke to heat the water in the external water tank.

[0008] The heat recovery unit includes an evaporator, a condenser, and a compressor. The heat exchange medium pipe of the evaporator is connected to the heat exchange medium pipe of the condenser. A compressor and an expansion valve are provided on the heat exchange medium pipe connecting the two, allowing the heat exchange medium to circulate between the evaporator and the condenser. The heat exchange medium pipe of the evaporator is disposed within the flue gas passage cavity of the flue gas passage unit, allowing the heat exchange medium pipe of the evaporator to contact the flue gas flowing through the flue gas passage to absorb the heat energy of the flue gas.

[0009] The water inlet of the condenser's outer casing is connected to the lower portion of the external water tank via a pipe, and a circulating pump is provided on the connecting pipe. The water outlet of the condenser's outer casing is connected to the upper portion of the external water tank via a pipe. The circulating pump circulates tap water entering the external water tank between the external water tank and the condenser's outer casing.

[0010] A pipe connected to tap water is provided at the lower part of the external water tank and a one-way safety valve is provided on the pipe, so that tap water can only flow into the external water tank and avoid backflow from the external water tank.

[0011] A hot water output pipe may be provided on the upper portion of the external water tank.

[0012] A liquid level switch may be provided in the middle of the inner cavity of the external water tank. The liquid level switch is associated with the one-way safety valve. When the water in the external water tank is below the liquid level switch, the one-way safety valve automatically switches from a closed state to a conductive state to inject tap water into the external water tank.

[0013] The conduction time of the one-way safety valve can be controlled by a timer, or by a sensor arranged at the upper part of the inner cavity of the external water tank, and the initial state of the one-way safety valve is a closed state.

[0014] Optionally, the vapor-liquid separation unit includes a vapor-liquid separation plate group fixed at the oil fume suction port of the vapor-liquid separation unit, and the vapor-liquid separation plate group is located below the cover plate and a distance is formed between the cover plate and the inner end surface.

[0015] The vapor-liquid separation plate group includes a top plate, a middle plate and a bottom plate, wherein the outer end surface of the top plate faces the inner end surface of the cover plate and a vertical distance is formed between the two facing surfaces. The bottom plate is fixed at the oil fume inlet.

[0016] A plurality of semi-cylindrical ridges are formed on the outer end surface of the top plate and are spaced apart along the length of the top plate, and the semi-cylindrical ridges extend through the width of the top plate. A plurality of first through holes are provided on one or both sides of the semi-cylindrical ridges and are spaced apart along the width of the top plate.

[0017] A plurality of columns are formed on the outer end surface of the middle plate, and a second through-hole is formed at the center of the distribution area of ​​four adjacent columns. A slot structure is provided on the inner end surface of the top plate, matching the first latching protrusion provided on the outer end surface of the middle plate, thereby securing the top plate above the middle plate. After the top plate is secured above the middle plate, the columns mate with the first through-holes in a one-to-one correspondence, and the free ends of the columns extend into the first through-holes. The inner diameter of the first through-hole is larger than the outer diameter of the columns. The free end surfaces of the columns are preferably constricted inward relative to the outer ends of the first through-holes.

[0018] A plurality of edge hole structures are formed on the outer end face of the bottom plate. A slot structure matching the second latch provided on the outer end face of the bottom plate is provided on the inner end face of the intermediate plate, so that the intermediate plate is fixed on top of the bottom plate. After the intermediate plate is fixed on top of the bottom plate, at least part of the edge hole structure can correspond to the second through hole and all or part of the edge hole structure can be exposed from the second through hole. The edge hole structure includes an annular flange and a third through hole, and the third through hole corresponds to the inner ring of the annular flange. A notch is formed on one side of the annular flange. Therefore, the annular flange is an incomplete annular structure. It is preferred that the free end face of the annular flange contacts the inner end face of the intermediate plate.

[0019] Optionally, a plurality of strip grooves are formed on the side wall of the column in a circumferential direction and are distributed alternately, and the strip grooves extend downward from the edge of the upper end plate of the column to the root of the column.

[0020] Optionally, the column is a conical column with a small diameter end of the column leaning against the top plate. The inner diameter of the first through hole is larger than the maximum outer diameter of the column.

[0021] The beneficial effect of the utility model is that the oil fume purification and heat recovery integrated exhaust hood involved in this patent can realize the recycling and utilization of kitchen smoke to meet the hot water demand in kitchen activities, help to fully utilize the kitchen heat energy, and help to improve the energy efficiency of the kitchen. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the overall structure of the implementation plan.

[0023] Figure 2 It is a schematic diagram of the partial cross-sectional structure of the vapor-liquid separation plate group in the scheme.

[0024] Figure 3 It is a schematic diagram of the top view of the structure of the vapor-liquid separation plate group after the top plate and the middle plate are stacked.

[0025] Figure 4 This is a schematic diagram of the top view of the structure after the middle plate and bottom plate of the vapor-liquid separation plate group are stacked.

[0026] Figure 5 This is a schematic diagram of the top view of the bottom plate of the vapor-liquid separation plate group.

[0027] Figure 6 It is a schematic diagram of the cross-sectional structure of the column formed on the middle plate.

[0028] Figure 7 Schematic diagram of the top view of the edge hole structure formed on the bottom plate.

[0029] Figure 8 for Figure 7 Schematic diagram of the AA section structure.

[0030] In the figure: 10 gas-liquid separation unit, 11 cover plate; 20 flue gas channel unit, 21 flue gas channel, 22 purification unit;

[0031] 30 fan unit, 31 discharge pipe; 40 heat recovery unit, 41 evaporator, 42 condenser, 43 compressor, 44 expansion valve;

[0032] 50 external water tank, 51 circulating pump, 52 liquid level switch; 60 oil tank; 70 gas-liquid separation plate assembly, 71 top plate, 711 semi-cylindrical ridge, 712 first through hole, 72 middle plate, 721 column, 721 strip groove, 722 second through hole, 723 first latch, 73 bottom plate, 731 edge hole structure, 731a annular flange, 731b third through hole, 731c notch, 732 second latch. DETAILED DESCRIPTION

[0033] The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for the understanding and reading of those familiar with this technology. They are not used to limit the conditions for the implementation of the utility model and therefore have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in the utility model without affecting the efficacy and purpose of the utility model. At the same time, terms such as "upper", "lower", "front", "back", and "middle" quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the utility model. Changes or adjustments in their relative relationships should also be considered as the scope of the implementation of the utility model without substantially changing the technical content.

[0034] like Figure 1 The exhaust hood shown is an integrated exhaust hood for oil fume purification and heat recovery, comprising a vapor-liquid separation unit 10 at the lower part of the exhaust hood, a flue gas channel unit 20, a purification unit 22, a fan unit 30 and a heat recovery unit 40 at the upper part of the exhaust hood; and an external water tank 50.

[0035] The heat recovery unit 40 is disposed along the flue gas passage 21 of the flue gas passage unit 20 and upstream of the fan unit 30. Thus, before the fan unit 30 draws the low-temperature hot flue gas outdoors, the low-temperature hot flue gas has already completed heat exchange with the heat recovery unit 40, meaning that the heat recovery unit 40 has already recovered and utilized the waste heat from the flue gas.

[0036] The purification unit 22 is arranged on the path of the flue gas channel 21 of the flue gas channel unit 20 and is located on the upstream side of the heat recovery unit 40. The purification unit 22 contains an electrostatic adsorption assembly. When the flue gas flows through the purification unit 22, it can be subjected to electrostatic adsorption and adsorb the solid particles (fine dust, etc.) contained in the flue gas, which helps to delay the cleaning time of the heat recovery unit 40 and the fan unit 30, reduce the cleaning frequency, and ensure that the heat exchange effect of the heat recovery unit 40 can be in the expected state for a long time. The electrostatic adsorption assembly of the purification unit 22 set in this patent can refer to the existing technology, so it is not repeated.

[0037] A cover plate 11 is provided at the oil fume intake port of the vapor-liquid separation unit 10 . Slotted hole structures are distributed on the cover plate 11 , and the generated oil fume can flow to the oil fume intake port through the slotted hole structures on the cover plate 11 .

[0038] One end of the smoke channel 21 in the smoke channel unit 20 is communicated with the oil smoke intake port of the vapor-liquid separation unit 10 , and the other end is communicated with the intake port of the fan unit 30 .

[0039] An exhaust pipe 31 is provided at the exhaust port of the fan unit 30 , and the exhaust pipe 31 is connected to a smoke output pipe so that the smoke can be discharged outdoors.

[0040] The suction force generated by the fan unit 30 during operation creates a draft at the fume intake port of the vapor-liquid separation unit 10, drawing the generated fume / oil vapor into the vapor-liquid separation unit 10. After vapor-liquid separation, the fume flows through the fume duct 21 to the fan unit 30 and is ultimately exhausted outdoors. While flowing through the fume duct 21, the fume comes into contact with the heat recovery unit 40, which recovers the waste heat from the fume to heat the water in the external water tank 50.

[0041] The heat recovery unit 40 includes an evaporator 41 , a condenser 42 , and a compressor 43 .

[0042] The heat exchange medium pipe of the evaporator 41 is connected to the heat exchange medium pipe of the condenser 42, and the compressor 43 and expansion valve 44 (throttling expansion valve) are installed on the heat exchange medium pipe connecting the two, allowing the heat exchange medium to circulate between the evaporator 41 and the condenser 42. The compressor 43 is located at the heat exchange medium inlet port of the condenser 42 and can press the heat exchange medium in the heat exchange medium pipe of the evaporator 41 into the heat exchange medium pipe of the condenser 42. The expansion valve 44 (throttling expansion valve) is installed in the pipe connecting the heat exchange medium outlet of the condenser 42 and the heat exchange medium inlet of the evaporator 41.

[0043] The heat exchange medium pipe of the evaporator 41 is arranged in the flue gas channel 21 cavity of the flue gas channel unit 20, so that the heat exchange medium pipe of the evaporator 41 can contact the low-temperature hot flue gas flowing through the flue gas channel 21 to absorb the heat energy of the low-temperature hot flue gas, thereby realizing the heat energy recovery and utilization process.

[0044] The water inlet of the condenser's outer casing (42) is connected to the lower portion of the external water tank (50) via a pipe, and a circulating pump (51) is installed on the connecting pipe. The water outlet of the condenser's outer casing (42) is connected to the upper portion of the external water tank (50) via a pipe. This establishes a water circulation system between the external water tank (50) and the condenser (42). The circulating pump (51) circulates tap water entering the external water tank (50) between the external water tank (50) and the outer casing (42).

[0045] A pipe connected to tap water is located at the bottom of the external water tank 50, and a one-way safety valve is installed on the pipe. A hot water outlet pipe is located at the top of the external water tank 50. A liquid level switch 52 is located in the center of the internal cavity of the external water tank 50. The liquid level switch 52 is linked to the one-way safety valve. When the water in the external water tank 50 is below the liquid level switch 52, the one-way safety valve is opened, allowing tap water to be injected into the external water tank 50 (unidirectionally).

[0046] The conduction time of the one-way safety valve can be controlled by a timer (not shown) or by a sensor (not shown) located at the upper portion of the inner cavity of the external water tank. When a timer is set, when the water level in the external water tank 50 reaches below the liquid level switch 52, the one-way safety valve is controlled to enter the conduction state and remain in the conduction state for T seconds before automatically returning to the closed state. The specific duration of T seconds needs to be determined based on factors such as the specific height position of the liquid level switch 52 relative to the external water tank, the volume of the external water tank, and the flow rate of the tap water inlet pipe. When a sensor is set, when the water level in the external water tank 50 reaches below the liquid level switch 52, the one-way safety valve is controlled to enter the conduction state. As tap water is continuously injected into the external water tank 50, the liquid level continues to rise, eventually triggering the sensor installed at the top of the external water tank, causing the sensor to feedback a sensor signal, and the controller changes the one-way safety valve from the conduction state to the closed state.

[0047] An oil tank 60 is fixedly provided below the vapor-liquid separation unit 10. The oil fume / oil vapor entering the vapor-liquid separation unit 10 is separated into gas and liquid within the unit 10. The separated oil and water flow along the inner wall of the vapor-liquid separation unit 10 into the oil tank 60 (this can be accomplished by referring to existing technologies). The separated low-temperature hot flue gas flows into the flue gas duct 21 under the suction force of the fan unit 30.

[0048] During kitchen operations, a steamer or stove will generate a large amount of steam or high-temperature oil smoke, etc. The existing exhaust hood is only equipped with an oil smoke separator (i.e., a vapor-liquid separation unit 10) to separate the discharged oil smoke / oil smoke into gas and liquid, so that a large amount of oil, water vapor and smoke are separated and recovered into the oil tank 60, but the content of water mist and small particles of oil smoke in the smoke is still at a relatively high level. Through the separation effect of the vapor-liquid separation plate group 70 designed by this patent, the content of water mist and small particles of oil smoke in the smoke discharged after passing through the vapor-liquid separation unit 10 can be reduced to a very low level, which helps to reduce the load of the electric field oil smoke purification (in the purification unit 22), so that the separated fine micro-particles of water vapor or oil smoke can further purify the smoke when passing through the electric field (in the purification unit 22), making the purification more sufficient.

[0049] The flue gas flowing through the flue gas passage 21 carries a large amount of heat, which is evaporated and absorbed by the evaporator 41 of the heat recovery unit 40. After absorbing the heat, the temperature of the flue gas discharged through the exhaust pipe 31 is significantly reduced, thereby achieving the purpose of flue gas heat recovery. After heat recovery, the refrigerant (heat exchange medium) is compressed by the compressor 43 to become a high-temperature, high-pressure gas. This high-temperature, high-pressure gas enters the condenser 42 for heat exchange, transferring heat to the water in the outer casing of the condenser 42. The large amount of hot water generated is stored in the external water tank 50, effectively achieving the purpose of flue gas heat recovery.

[0050] like Figures 2 to 5 、 Figures 7 and 8 As shown, the vapor-liquid separation unit 10 includes a vapor-liquid separation plate group 70 fixed at the oil fume suction port of the vapor-liquid separation unit 10, and the vapor-liquid separation plate group 70 is located below the cover plate 11. A vertical / vertical spacing is formed between the vapor-liquid separation plate group 70 and the opposite surface of the cover plate 11. The size of the spacing is generally controlled within the range of 5 mm, preferably within the range of 3 mm.

[0051] The vapor-liquid separation plate assembly 70 includes a top plate 71 , a middle plate 72 and a bottom plate 73 . The outer end surface of the top plate 71 faces the inner end surface of the cover plate 11 , and a vertical distance is formed between the two facing surfaces.

[0052] The bottom plate 73 is fixed at the oil fume suction port, and the bottom plate 73 can cover the oil fume suction port.

[0053] A plurality of semi-cylindrical ridges 711 are formed on the outer end surface of the top plate 71, spaced apart along the length (left-right direction in the figure) of the top plate 71. The semi-cylindrical ridges 711 extend through the width (up-down direction in the figure) of the top plate 71. A plurality (three in the figure) of first through holes 712 are formed on the body of the top plate 71, corresponding to one or both sides of the semi-cylindrical ridges 711. The plurality of first through holes 712 are spaced apart along the width of the top plate 71.

[0054] A plurality of columns 721 are formed on the outer end surface of the middle plate 72, and a second through hole 722 is formed at the center of the distribution area of ​​four adjacent columns 721. A slot structure is provided on the inner end surface of the top plate 71, which matches the first latching protrusion 723 provided on the outer end surface of the middle plate 72, so that the top plate 71 can be fixed (cantilevered) above the middle plate 72.

[0055] After the top plate 71 is fixed above the middle plate 72, the column 721 is matched with the first through hole 712 in a one-to-one manner, and the free end of the column 721 extends into the first through hole 712. The inner diameter of the first through hole 712 is larger than the outer diameter of the column 721. Preferably, the free end surface of the column 721 is retracted inward relative to the outer end of the first through hole 712, or the free end surface of the column 721 can be extended relative to the outer end of the first through hole 712. In this case, the distance between the free end plate of the column 721 and the inner end surface of the cover plate is smaller than the distance between the outer end surface of the top plate and the inner end surface of the cover plate 11.

[0056] The outer end surface of the bottom plate 73 is formed with a plurality of edge hole structures 731. The inner end surface of the intermediate plate 72 is provided with a slot structure that matches the second latching protrusion 732 provided on the outer end surface of the bottom plate 73, so that the intermediate plate 72 can be fixed (suspended) above the bottom plate 73.

[0057] After the middle plate 72 is fixed to the bottom plate 73, at least a portion of the edge hole structure 731 can correspond to the second through hole 722, and all or part of the edge hole structure 731 can be exposed from the second through hole 722. Generally, the outer diameter of the edge hole structure 731 (the middle annular flange 731a, which will be mentioned below) is smaller than the inner diameter of the second through hole 722 and larger than 1 / 2 of the inner diameter of the second through hole 722.

[0058] The edge hole structure 731 includes an annular flange 731a and a third through hole 731b. The third through hole 731b corresponds to the inner ring of the annular flange 731a. The inner diameter of the third through hole 731b can be equal to or greater than the inner diameter at the base / lower end of the annular flange 731a. A notch 731c is formed on one side of the annular flange 731a. Therefore, the annular flange 731a has an incomplete annular structure.

[0059] Correspondingly, in the plurality of edge hole structures 731 distributed around a second through hole 722 , at least some of the notches 731 c on the annular flanges 731 a face the second through hole 722 .

[0060] The free end surface of the annular flange 731a may be in contact with the inner end surface of the intermediate plate 72, or a gap may be formed between the opposing surfaces of the two.

[0061] The curved surface (side wall) of the semi-cylindrical ridge 711 may be tangent to the inner end surface of the cover plate 11 .

[0062] The vapor-liquid separation plate assembly 70 of the aforementioned structure efficiently separates oil and water vapor from the smoke, significantly reducing the amount of oil and water vapor entrained in the smoke. This significantly slows the formation of oil sludge on the walls of the smoke duct 21 and the heat recovery unit 40 (particularly its evaporator 41), extending cleaning time and reducing cleaning frequency, thereby helping to lower operating and maintenance costs. Specifically, when kitchen smoke / fumes enter the gas-liquid separation unit 10 through the slots in the cover plate 11, they first come into contact with the outer end surface of the top plate 71, achieving the first physical separation step. Then the oil fume / oil fume vapor will enter between the opposite surfaces of the top plate 71 and the middle plate 72 through the first through hole 712. During the entry process, part of the oil fume / oil fume vapor contacts the side wall of the column 721, and part of the oil fume / oil fume vapor directly contacts the outer end surface of the middle plate 72, realizing the second physical separation process. The cooperation between the column 721 and the first through hole 712 can cause the oil fume / oil fume vapor to turbulent flow, slow down the flow speed, and enhance the physical separation effect. Then the oil fume / oil vapor will climb from the side wall of the column to the outer end face of the middle plate 72 and enter the second through hole 722, or directly climb into the second through hole 722 from the outer end face of the middle plate 72 and enter between the opposite surfaces of the middle plate 72 and the bottom plate 73, and finally enter the third through hole 731b through the notch 731c on the annular flange 731a, completing the third physical separation process. When the oil fume / oil vapor flows between the middle plate 72 and the bottom plate 73, it is blocked by the annular flange 731a and cannot directly enter the third through hole 731b, which can promote mixed flow in the oil fume / oil vapor and prolong the contact time, thereby enhancing the physical separation effect.

[0063] like Figure 6 As shown, a plurality of strip grooves 7211 are formed on the side wall of the column 721 in a circumferential direction. The strip grooves 7211 extend downward from the edge of the upper end plate of the column 721 to the root of the column 721.

[0064] The cylinder 721 is a conical cylinder, and the small diameter end of the cylinder 721 is close to the top plate 71. The inner diameter of the first through hole 712 is larger than the maximum outer diameter of the cylinder 721.

[0065] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. The present invention is susceptible to numerous improvements without departing from the overall concept. Those skilled in the art will appreciate the potential for modification or alteration of the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations accomplished by those skilled in the art without departing from the spirit and technical principles disclosed herein shall be encompassed by the claims of the present invention.

Claims

1. An integrated fume purifying and heat-recovering exhaust hood, comprising a vapor-liquid separation unit at the lower part of the exhaust hood, a fume channel unit, a purification unit and a fan unit at the upper part of the exhaust hood; a cover plate is provided at the fume inlet of the vapor-liquid separation unit, and a slot structure is distributed and formed on the cover plate; the fume channel of the fume channel unit can connect the fume inlet of the vapor-liquid separation unit with the fan unit; the purification unit is provided on the path of the fume channel and the purification unit contains an electrostatic adsorption assembly; Features: It also includes a heat recovery unit and an external water tank; the purification unit is arranged on the upstream side of the heat recovery unit; The heat recovery unit includes an evaporator, a condenser and a compressor. The heat exchange medium pipe of the evaporator is connected to the heat exchange medium pipe of the condenser, and a compressor and an expansion valve are provided on the heat exchange medium pipe connecting pipeline between the two, so that the heat exchange medium can circulate between the evaporator and the condenser; the heat exchange medium pipe of the evaporator is arranged in the cavity of the flue gas channel; the water inlet of the outer shell box of the condenser is connected to the lower part of the external water tank through a pipeline, and a circulating pump is provided on the connecting pipeline; the water outlet of the outer shell box of the condenser is connected to the upper part of the external water tank through a pipeline.

2. The oil fume purification and heat recovery integrated exhaust hood according to claim 1, Features: The external water tank is provided with a pipe connected to the tap water at the lower part and a one-way safety valve on the pipe, and a hot water output pipe is provided at the upper part; a liquid level switch associated with the one-way safety valve is provided in the middle part of the inner cavity of the external water tank, so that when the water in the external water tank is below the liquid level switch, the one-way safety valve can be switched from a closed state to a conducting state.

3. The integrated fume purifying and heat recovering exhaust hood according to claim 1 or 2, Features: The gas-liquid separation unit comprises a gas-liquid separation plate group fixed at the oil fume suction port, so that the gas-liquid separation plate group is arranged correspondingly below the cover plate; The vapor-liquid separation plate group includes a top plate, a middle plate and a bottom plate; the outer end surface of the top plate is opposite to the inner end surface of the cover plate and a vertical distance is formed between the opposite surfaces; the bottom plate is fixed at the oil fume suction port; A plurality of semi-cylindrical ridges are formed on the outer end surface of the top plate and are distributed alternately along the length direction of the top plate, and the semi-cylindrical ridges extend across the width direction of the top plate; a plurality of first through holes are distributed on one side or both sides of the semi-cylindrical ridges on the top plate, and the plurality of first through holes are distributed alternately along the width direction of the top plate; A plurality of column barrels are formed on the outer end surface of the middle plate, and a second through hole is formed at the center of the four adjacent column barrel distribution areas; a slot structure matching the first clamping protrusion provided on the outer end surface of the middle plate is provided on the inner end surface of the top plate, so that the top plate is fixed on the top of the middle plate; the column barrels are matched with the first through holes in a one-to-one correspondence, and the free ends of the column barrels extend into the first through holes; the inner diameter of the first through holes is larger than the outer diameter of the column barrels; A plurality of edge hole structures are formed on the outer end surface of the bottom plate; a slot structure matching the second clamping protrusion arranged on the outer end surface of the bottom plate is provided on the inner end surface of the middle plate, so that the middle plate is fixed on the top of the bottom plate; at least part of the edge hole structure can correspond to the second through hole and all or part of the edge hole structure can be exposed from the second through hole; the edge hole structure includes an annular flange and a third through hole, the third through hole corresponds to the inner circle of the annular flange and a notch is formed on one side of the annular flange.

4. The oil fume purification and heat recovery integrated exhaust hood according to claim 3, Features: The free end surface of the column barrel shrinks inwardly relative to the outer end of the first through hole.

5. The integrated fume purifying and heat recovering exhaust hood according to claim 4, Features: The free end surface of the annular flange contacts the inner end surface of the middle plate.

6. The oil fume purification and heat recovery integrated exhaust hood according to claim 3, Features: The free end surface of the annular flange contacts the inner end surface of the middle plate.

7. The integrated fume purifying and heat recovering exhaust hood according to claim 3, Features: A plurality of strip-shaped grooves distributed alternately are formed on the side wall of the column in a circumferential direction.

8. The oil fume purification and heat recovery integrated exhaust hood according to claim 7, Features: The strip groove extends downward from the edge of the upper end plate of the column to the root of the column.

9. The oil fume purification and heat recovery integrated exhaust hood according to claim 7, Features: The cylinder is a conical cylinder, and the small diameter end of the cylinder is close to the top plate; the inner diameter of the first through hole is greater than the maximum outer diameter of the cylinder.

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