Exhaust hood capable of recovering heat

Abstract

The utility model relates to a smoke exhaust hood capable of heat recovery, which comprises a gas-liquid separation hood positioned at the lower part of the smoke exhaust hood and a smoke channel unit positioned at the upper part of the smoke exhaust hood, a first heat exchange coil pipe is positioned in a heat recovery unit, a first connecting pipe is connected with an external high-temperature water storage tank, and the surface of the external high-temperature water storage tank is also connected with a high-temperature water outlet pipe; a third heat exchange coil pipe is installed in the external high-temperature water storage tank, one port is connected with the heat dissipation unit, the other port is connected with the heat recovery module, the surface of the heat dissipation unit is further connected with a second connecting pipe, the second connecting pipe is connected with the third heat exchange coil pipe, and a third water pump is installed on a pipeline of the third heat exchange coil pipe. A second heat exchange coil pipe is further installed in the heat recovery unit, the water inlet end and the water outlet end of the second heat exchange coil pipe are connected with the heat recovery module, and a second water pump is installed on a pipeline of the second heat exchange coil pipe. The exhaust hood solves the problem that although the existing exhaust hood can meet the requirement for hot water and reduce energy consumption, heating cannot be achieved, and therefore energy consumption cannot be reduced more effectively.

Description

Technical Field

[0001] This utility model relates to the field of kitchen exhaust hood technology, specifically a heat-recoverable exhaust hood. Background Technology

[0002] Currently, kitchen fumes are typically drawn directly outdoors by fans. However, since fumes have a certain temperature, direct emission results in energy waste. Household water requires a large amount of hot water, which is currently generated by water heaters and a few solar water heaters, thus consuming additional energy.

[0003] Therefore, in order to reduce energy consumption and effectively recover and utilize heat from cooking fumes, Chinese patent CN222143176U, an integrated fume purification and heat recovery exhaust hood, indicates that the heat exchange medium pipe of the evaporator is located inside the flue gas channel. The condenser adopts a heat exchange method of refrigerant and water exchange, and the condenser is equipped with inlet and outlet water ports connected to an external water tank through pipes. This patent can realize the recovery and utilization of waste heat from kitchen fumes, meet the hot water demand in the kitchen, and achieve the purpose of energy conservation and emission reduction. Indeed, the design of the above patent can reduce additional energy consumption and achieve effective heat recovery. However, this patent still has some shortcomings. Although the above patent can realize the recovery of hot water, the temperature in the kitchen is low when cooking in a typical household in winter, and this patent cannot meet the need for heating the kitchen while providing warm water. Therefore, it has certain shortcomings.

[0004] Therefore, in order to fully utilize the heat from cooking fumes, satisfying both hot water and kitchen heating needs, and further reducing energy consumption while achieving more efficient heat utilization, a heat-recoverable fume hood is proposed to address the shortcomings of existing technologies. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a heat-recoverable fume hood, which solves the problem that while existing fume hoods can meet the needs of hot water use and reduce energy consumption, they cannot provide heating, thus failing to more effectively reduce energy consumption.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a heat-recoverable fume hood, comprising a gas-liquid separation hood at the lower part of the fume hood and a flue gas channel unit at the upper part. The flue gas channel unit is divided into a flue gas channel, a purification unit, a heat recovery unit, and a fan unit. A cover plate is provided at the inlet of the gas-liquid separation hood, with openings distributed on the cover plate. The fan unit draws flue gas into the flue gas channel, which then passes through the purification unit and the heat recovery unit in sequence before being discharged through an outlet pipe located at the upper end of the flue gas channel unit. The heat recovery unit is characterized by having a heat recovery module, which includes an external water tank, an external high-temperature water storage tank, a heat dissipation unit, a heat recovery module, a first water pump, a first heat exchange coil, a second water pump, a second heat exchange coil, a third heat exchange coil, and a three-way connecting pipe. The heat recovery module forms an integrated heat recovery loop through the connection of these connecting pipes. The surface of the water tank is connected to a tap water pipe, the inlet and outlet of the first heat exchange coil, and a first connecting pipe. A first water pump is installed on the first heat exchange coil. The first heat exchange coil is located inside the heat recovery unit. The first connecting pipe is connected to an external high-temperature water storage tank. A high-temperature water outlet pipe is also connected to the surface of the external high-temperature water storage tank. A third heat exchange coil is installed inside the external high-temperature water storage tank, with one end connected to the heat dissipation unit and the other end connected to the heat recovery module. A second connecting pipe and a third connecting pipe are also connected to the surface of the heat dissipation unit. The third connecting pipe is connected to the third heat exchange coil, and its other end is connected to the heat recovery module. The second connecting pipe is connected to the third heat exchange coil. A third water pump is installed on the third heat exchange coil. A second heat exchange coil is also installed inside the heat recovery unit. The inlet and outlet of the second heat exchange coil are connected to the heat recovery module. A second water pump is installed on the second heat exchange coil.

[0007] Further, the heat recovery module includes an evaporator, a condenser, a compressor, and an expansion valve, as described above. The evaporator and condenser are connected by pipes, wherein the evaporator inlet pipe is connected to the outlet of the third heat exchange coil, and the condenser outlet is connected to the inlet of the second heat exchange coil. An expansion valve is also installed on the pipe connecting the evaporator and condenser. The outlet of the second heat exchange coil is connected to the compressor, and the compressor outlet is connected to the three-way connecting pipe.

[0008] Furthermore, the purification unit is equipped with a purification structure, which includes a cavity plate, a connecting pipe, and a purification component. The cavity plate is installed inside the cavity plate, and a cavity is provided on the left side of the cavity plate. An opening is provided on the left side of the cavity plate. A connecting pipe is connected through the bottom of the cavity. A plate extends downward from the lower end of the cavity plate, and an opening is provided on the surface of the plate. A purification component is installed on the upper end of the cavity plate.

[0009] As a preferred technical solution, the purification component includes an upper mounting plate, a lower mounting plate, and a filter element; the lower mounting plate is mounted on the upper end face of the cavity plate, and the filter element is disposed between the lower mounting plate and the upper mounting plate.

[0010] Furthermore, an oil trough structure is installed at the lower end of the surface of the gas-liquid separation hood. The oil trough structure includes an oil guide plate and an outlet pipe. The oil guide plate is installed at the lower part of the front end face of the gas-liquid separation hood, and an outlet pipe is provided on the surface of the oil guide plate.

[0011] As a preferred technical solution, the fan unit is equipped with a fan structure, which includes a mounting bracket and a centrifugal fan. The mounting bracket is installed at the bottom of the fan unit, and the centrifugal fan is installed at the upper end of the mounting bracket. The outlet of the centrifugal fan is connected to the outlet pipe.

[0012] Furthermore, the heat dissipation unit is a heat sink, which can be installed indoors or outdoors.

[0013] Compared with the prior art, this utility model provides a heat-recoverable fume hood, which has the following beneficial effects:

[0014] 1. This fume hood enables full recovery of heat from cooking fumes. This full recovery of heat can meet both hot water and kitchen heating needs, thus making full use of the heat source and improving energy efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the cover plate structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the heat recovery module of this utility model;

[0018] Figure 4 This is a schematic diagram of the purification component of this utility model;

[0019] Figure 5 This is a schematic diagram of the upper mounting plate, lower mounting plate, filter element, and structure of this utility model;

[0020] Figure 6 This utility model Figure 5 A schematic diagram of the AA cross-sectional structure.

[0021] In the diagram: 1. Gas-liquid separation hood; 2. Oil guide plate; 3. Outlet pipe; 4. Flue gas passage unit; 5. Flue gas passage; 6. Purification unit; 7. Heat recovery unit; 8. Fan unit; 9. Mounting bracket; 10. Centrifugal fan; 11. Air outlet pipe; 12. External water tank; 13. External high-temperature water storage tank; 14. Heat dissipation unit; 15. Heat recovery module; 16. First water pump; 17. First heat exchange coil; 18. Second water pump; 19. Second heat exchange coil; 20. Third heat exchange coil; 21. First connecting pipe; 22. Cavity plate; 23. Connecting pipe; 24. Purification component; 2401. Upper mounting plate; 2402. Lower mounting plate; 2403. Filter element; 25. Third water pump; 26. Three-way connecting pipe; 27. Second connecting pipe; 28. Cover plate. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0023] Please see Figure 1-6This utility model provides the following technical solution: a heat-recoverable fume hood, comprising a gas-liquid separation hood 1 located at the lower part of the fume hood and a flue gas passage unit 4 located at the upper part. The flue gas passage unit 4 is divided into a flue gas passage 5, a purification unit 6, a heat recovery unit 7, and a fan unit 8. A cover plate 28 is provided at the inlet of the gas-liquid separation hood 1, and openings are distributed on the cover plate 28. The fan unit 8 can draw flue gas into the flue gas passage 5 and pass through the purification unit 6 and the heat recovery unit 7 in sequence before passing through the openings in the flue gas passage. The air is discharged through the outlet pipe 11 at the upper end of unit 4. The heat recovery unit 7 is characterized by having a heat recovery module, which includes an external water tank 12, an external high-temperature water storage tank 13, a heat dissipation unit 14, a heat recovery module 15, a first water pump 16, a first heat exchange coil 17, a second water pump 18, a second heat exchange coil 19, a third heat exchange coil 20, and a three-way connecting pipe 26. This heat recovery module forms an integrated heat recovery loop through the connection of these connecting pipes. The surface of the external water tank 12 is respectively connected to self-contained... The system includes a water inlet pipe, an inlet and outlet pipe of the first heat exchange coil 17, a first connecting pipe 21, and a first water pump 16 installed on the first heat exchange coil 17. The first heat exchange coil 17 is located within the heat recovery unit 7. The first connecting pipe 21 is connected to an external high-temperature water storage tank 13. A high-temperature outlet pipe is also connected to the surface of the external high-temperature water storage tank 13. A third heat exchange coil 20 is installed inside the external high-temperature water storage tank 13, with one end connected to the heat dissipation unit 14 and the other end connected to the heat recovery module 15. The heat dissipation unit 1... The surface of the 4 unit is also connected to a second connecting pipe 27 and a third connecting pipe 26. The third connecting pipe 26 is connected to the third heat exchange coil 20 and its other end is connected to the heat recovery module 15. The second connecting pipe 27 is connected to the third heat exchange coil 20. A third water pump 25 is installed on the pipeline of the third heat exchange coil 20. A second heat exchange coil 19 is also installed in the heat recovery unit 7. The inlet and outlet of the second heat exchange coil 19 are connected to the heat recovery module 15. A second water pump 18 is installed on the pipeline of the second heat exchange coil 19.

[0024] In this implementation plan, the specific working principle is as follows: How does the fume hood achieve effective heat recovery? First, refer to the diagram. Figure 1 and Figure 3 It is evident that the external water tank 12 is equipped with a pipe connected to the tap water supply, and a one-way safety valve is installed on the pipe. Furthermore, the external water tank 12 is equipped with a level switch associated with the one-way safety valve. When the water level is below the level switch, the one-way safety valve is in the open state.

[0025] One-way safety valves are installed on the connecting pipes of the three-way connecting pipe 26, the third heat exchange plate 20, and the heat dissipation unit 14. One-way safety valves are also installed on the second connecting pipe 27 and the third heat exchange plate 20. The above-mentioned one-way safety valves are in the conducting state. Furthermore, the medium flowing through the third heat exchange plate 20 and the second heat exchange plate 19 is antifreeze.

[0026] First, tap water enters the external water tank 12. Through the action of the first water pump 16, the water is output to the first heat exchange plate 17 to absorb heat from the flue gas. The absorbed warm water is then transferred back to the external water tank 12 via the first heat exchange plate 17, and finally enters the external high-temperature water storage tank 13. How does the external high-temperature water tank 13 generate high-temperature hot water? Water in the third heat exchange plate 20 passes through the second water pump 18 and the third water pump 25, and then flows through the heat recovery module 15. The heat recovery module 15 turns the warm water into cold water, which then passes through the second heat exchange plate... Heat is absorbed again by the second heat exchange plate 19, and the flue gas is purified and cooled before being discharged to the outside as hot air by the fan unit 8. At this time, the water in the second heat exchange plate 19 flows back into the heat recovery module 15 and is converted into hot water. The hot water then flows through the three-way connecting pipe 26 to the heat dissipation unit 14 and the external high-temperature water storage tank 13 respectively. The warm water in the external high-temperature water storage tank 13 generates high-temperature water through the action of the third heat exchange plate 20, which facilitates the use of hot water in the kitchen. In addition, the heat dissipation unit 14 can heat the kitchen, thereby making full use of the heat source and effectively reducing energy consumption.

[0027] Based on the above, the heat recovery module 15 transforms warm water into cold water and cold water into high-temperature water. The heat recovery module 15 includes an evaporator, a condenser, a compressor, and an expansion valve. The evaporator and condenser are connected by pipes. The evaporator inlet pipe is connected to the outlet of the third heat exchange coil 20, and the condenser outlet is connected to the inlet of the second heat exchange coil 19. An expansion valve is also installed on the pipe connecting the evaporator and condenser. The outlet of the second heat exchange coil 19 is connected to the compressor, and the compressor outlet is connected to the three-way connecting pipe 26. First, the medium in the third heat exchange coil 20 transforms warm water into cold water through the action of the evaporator and condenser. Then, the cold water is transformed into high-temperature water through the action of the compressor.

[0028] For details regarding purification unit 6, please refer to [link / reference]. Figure 1 , Figure 4-6As can be seen, the purification unit 6 is equipped with a purification structure, which includes a cavity plate 22, a connecting pipe 23, and a purification component 24. The cavity plate 22 is installed inside the cavity plate 22. A cavity is provided on the left side of the cavity plate 22, and an opening is provided on the left side of the cavity plate 22. The connecting pipe 23 is connected through the bottom of the cavity. A plate extends downward from the lower end of the cavity plate 22, and an opening is provided on the surface of the plate. The purification component 24 is installed on the upper surface of the cavity plate 22. The flue gas first passes through the cavity plate 22, and the cavity plate 22 has an opening on its surface. The contact surface between plate 22 and flue gas can adsorb a certain amount of oil fumes, which then enter the cavity plate 22. At this time, the inner surface of cavity plate 22 can adsorb oil fumes. In order to avoid the oil fumes blocking the air, the flue gas will enter the space between cavity plate 22 and the inner wall of flue gas channel 4 through connecting pipe 23. At this time, the flue gas will generate a swirling phenomenon at the bottom of cavity plate 22, which can better adsorb the oil stains in the flue gas and reduce the pressure of purification component 24. After the flue gas passes through connecting pipe 23 and then through plate, it enters purification component 24 for purification treatment.

[0029] Based on the above, for easier replacement of filter element 2403, please refer to the following: Figure 5 and Figure 6 As can be seen, the purification component 24 includes an upper mounting plate 2401, a lower mounting plate 2402, and a filter element 2403; the lower mounting plate 2402 is mounted on the upper end face of the cavity plate 22, and the filter element 2403 is provided between the lower mounting plate 2402 and the upper mounting plate 2401.

[0030] For details on filtering liquids from flue gas in the early stages, please refer to [link / reference needed]. Figure 1 and Figure 2 As can be seen, an oil tank structure is installed at the lower end of the surface of the gas-liquid separation hood 1. The oil tank structure includes an oil guide plate 2 and an outlet pipe 3. The oil guide plate 2 is installed at the lower part of the front end face of the gas-liquid separation hood 1, and an outlet pipe 3 is provided on the surface of the oil guide plate 2.

[0031] For details on fan unit 8, please refer to [link / reference]. Figure 1 As can be seen, a fan structure is installed inside the fan unit 8. The fan structure includes a mounting bracket 9 and a centrifugal fan 10. The mounting bracket 9 is installed at the bottom inside the fan unit 8, and the centrifugal fan 10 is installed at the upper end of the mounting bracket 9. The air outlet of the centrifugal fan 10 is connected to the air outlet pipe 11.

[0032] In order to enable the heat dissipation unit 14 to provide indoor heating and also to dissipate heat in a timely manner when heating is not required, the heat dissipation unit 14 is a heat sink, which can be installed indoors or outdoors.

[0033] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A heat-recoverable fume hood, comprising a gas-liquid separation hood (1) at the lower part of the fume hood and a flue gas passage unit (4) at the upper part, wherein the flue gas passage unit (4) is divided into a flue gas passage (5), a purification unit (6), a heat recovery unit (7), and a fan unit (8), wherein a cover plate (28) is provided at the inlet of the gas-liquid separation hood (1), and openings are distributed on the cover plate (28), wherein the fan unit (8) can draw flue gas into the flue gas passage (5) and pass through the purification unit (6) and the heat recovery unit (7) in sequence, and then discharge it through the exhaust pipe (11) opened at the upper end of the flue gas passage unit (4), characterized in that: The heat recovery unit (7) is equipped with a heat recovery module, which includes an external water tank (12), an external high-temperature water storage tank (13), a heat dissipation unit (14), a heat recovery module (15), a first water pump (16), a first heat exchange coil (17), a second water pump (18), a second heat exchange coil (19), a third heat exchange coil (20), and a three-way connecting pipe (26). The heat recovery module forms an integrated heat recovery loop through the connection of each connecting pipe. The surface of the external water tank (12) is connected to a tap water pipe, the inlet and outlet of the first heat exchange coil (17), and a first connecting pipe (21). The first water pump (16) is installed on the pipe of the first heat exchange coil (17). The first heat exchange coil (17) is located in the heat recovery unit (7). The first connecting pipe (21) is connected to the external high-temperature water storage tank (13). A high-temperature water outlet pipe is also connected to the surface of the water storage tank (13). A third heat exchange coil (20) is installed inside the external high-temperature water storage tank (13). One port is connected to the heat dissipation unit (14) and the other port is connected to the heat recovery module (15). A second connecting pipe (27) and a three-way connecting pipe (26) are also connected to the surface of the heat dissipation unit (14). The three-way connecting pipe (26) is connected to the third heat exchange coil (20) and the other port is connected to the heat recovery module (15). The second connecting pipe (27) is connected to the third heat exchange coil (20). A third water pump (25) is installed on the pipeline of the third heat exchange coil (20). A second heat exchange coil (19) is also installed inside the heat recovery unit (7). The inlet and outlet of the second heat exchange coil (19) are connected to the heat recovery module (15). A second water pump (18) is installed on the pipeline of the second heat exchange coil (19).

2. The heat-recoverable fume hood according to claim 1, characterized in that: The heat recovery module (15) includes an evaporator, a condenser, a compressor, and an expansion valve. The evaporator and the condenser are connected by a pipe, wherein the evaporator inlet pipe is connected to the outlet of the third heat exchange coil (20), and the condenser outlet is connected to the inlet of the second heat exchange coil (19). An expansion valve is also installed on the pipe connecting the evaporator and the condenser. The outlet of the second heat exchange coil (19) is connected to the compressor, and the compressor outlet is connected to the three-way connecting pipe (26).

3. The heat-recoverable fume hood according to claim 1, characterized in that: The purification unit (6) is equipped with a purification structure, which includes a cavity plate (22), a connecting pipe (23), and a purification component (24). The cavity plate (22) is installed inside the cavity plate (22). A cavity is provided on the left side of the cavity plate (22). An opening is provided on the left side of the cavity plate (22). A connecting pipe (23) is connected through the bottom of the cavity. A plate extends downward from the lower end of the cavity plate (22), and an opening is provided on the surface of the plate. A purification component (24) is installed on the upper end of the cavity plate (22).

4. The heat-recoverable fume hood according to claim 3, characterized in that: The purification component (24) includes an upper mounting plate (2401), a lower mounting plate (2402), and a filter element (2403); the lower mounting plate (2402) is mounted on the upper end face of the cavity plate (22), and the filter element (2403) is provided between the lower mounting plate (2402) and the upper mounting plate (2401).

5. A heat-recoverable fume hood according to claim 1, characterized in that: An oil tank structure is installed at the lower end of the surface of the gas-liquid separation hood (1). The oil tank structure includes an oil guide plate (2) and an outlet pipe (3). The oil guide plate (2) is installed at the lower part of the front end face of the gas-liquid separation hood (1), and an outlet pipe (3) is provided on the surface of the oil guide plate (2).

6. The heat-recoverable fume hood according to claim 1, characterized in that: The fan unit (8) is equipped with a fan structure, which includes a mounting bracket (9) and a centrifugal fan (10). The mounting bracket (9) is installed at the bottom of the fan unit (8), and the centrifugal fan (10) is installed at the upper end of the mounting bracket (9). The outlet of the centrifugal fan (10) is connected to the outlet pipe (11).

7. A heat-recoverable fume hood according to claim 1, characterized in that: The heat dissipation unit (14) is a heat sink, which can be installed indoors or outdoors.

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