A heat recovery type catering kitchen air conditioning system and its use method

Abstract

The present invention discloses a heat recovery catering kitchen air conditioning system and a method for using the same. The system includes a first water tank, a second water tank, a third water tank, and a fourth water tank connected in sequence via a water pipeline. The second condenser of the heat pipe working medium circuit is disposed at the kitchen air inlet and is used to heat the kitchen fresh air. A sewage waste heat recovery device is used to heat the first water tank. An automatic heating control device is used to control the heating of the fourth water tank. The heat pipe working medium circuit is used to heat the third water tank and the second water tank separately or to heat the third water tank and the kitchen fresh air separately. The air conditioning refrigerant circuit is used to heat the second water tank separately or to absorb heat from the third water tank separately. The heat recovery catering kitchen air conditioning system and a method for using the same provided by the present invention can simultaneously recover waste heat generated by kitchen sewage, pipeline oil smoke, and air conditioning condensation heat. While efficiently preparing hot water for the kitchen, it meets the kitchen's heating, ventilation, and cooling needs in all seasons and reduces energy consumption.

Description

Technical Field

[0001] The present invention relates to a heat recovery type catering kitchen air-conditioning system and a use method thereof, belonging to the technical field of refrigeration heat pump air-conditioning system design. Background Art

[0002] Hot water supply in restaurant kitchens is a key aspect of their architectural design. Currently, local hot water supply systems mostly use small heaters such as gas water heaters, steam water heaters, electric water heaters, solar water heaters, and stoves. With society's growing emphasis on energy conservation and environmental protection, the use of solar energy and heat pumps to heat kitchen water is gaining increasing attention. Simultaneously, with rising living standards, people's expectations for their living and working environments have also significantly increased. Heat pump air conditioning systems are widely used due to their advantages, including balancing cooling and heating, energy conservation, environmental protection, and flexible installation. Furthermore, in Chinese cuisine, many ingredients are fried, stir-fried, and deep-fried at high temperatures during cooking, generating a large amount of high-temperature fumes. In addition, washing vegetables and dishes in the kitchen during winter also produces a large amount of medium-temperature wastewater. Furthermore, kitchen air conditioning requires a large amount of heat to be released or absorbed outdoors for cooling and heating. Using traditional kitchen air conditioning and water heating technologies results in high operating costs and unsatisfactory performance. There is an urgent need for a restaurant kitchen air conditioning system that can couple kitchen waste heat recovery with an air conditioning heat pump system. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the existing technology and provide a heat recovery type catering kitchen air-conditioning system and its use method, which can simultaneously recover the waste heat generated by kitchen sewage, pipeline oil smoke and air-conditioning condensation heat, and meet the heating, ventilation and cooling needs of the kitchen in all seasons while efficiently preparing kitchen hot water, and reduce energy consumption.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A heat recovery type catering kitchen air-conditioning system includes a first water tank, a second water tank, a third water tank and a fourth water tank connected in sequence by a water pipeline, the first water tank and the fourth water tank are used for water intake and water supply, respectively, and also includes a sewage waste heat recovery device, a heating automatic control device, a heat pipe working fluid circuit, and an air-conditioning refrigerant circuit. The second condenser of the heat pipe working fluid circuit is arranged at the air inlet of the kitchen, which is used to heat the fresh air in the kitchen. The sewage waste heat recovery device recovers waste heat from sewage for heating the first water tank. The heating automatic control device is arranged on the fourth water tank for heating the fourth water tank. The heat pipe working fluid circuit recovers waste heat from the flue for heating the third water tank and the second water tank alone, or heating the third water tank and the fresh air in the kitchen through the second condenser alone. The air-conditioning refrigerant circuit is used to heat the second water tank alone or to take heat from the third water tank alone.

[0006] The sewage waste heat recovery device includes a first four-way valve, one input end of the first four-way valve is connected to the output end of the first compressor, and the other input end is connected to the output end of the plate heat exchanger. One output end of the first four-way valve is connected to the input end of the first fin heat exchanger, and the other output end is connected to the first gas-liquid separator. The plate heat exchanger is arranged in the sewage channel, the input end of the plate heat exchanger is connected to one end of the first expansion valve, and the other end of the first expansion valve is connected to the output end of the first fin heat exchanger. The first fin heat exchanger is arranged in the first water tank, and the input end of the first compressor is connected to the first gas-liquid separator.

[0007] The automatic heating control device includes a controller, the input end of the controller is connected to the output end of the signal converter, the input end of the signal converter is connected to the temperature sensor, the input end of the controller is connected to the single-pole double-throw switch, one end of the single-pole double-throw switch is connected to the protection switch, the fuse and one end of the resistance wire in sequence, the other end of the resistance wire is connected to the other end of the single-pole double-throw switch, the connection protection switch is provided with a live wire connector and a neutral wire connector, and the temperature sensor and the resistance wire are arranged in the fourth water tank.

[0008] The air conditioner refrigerant circuit includes a second four-way valve, and end b of the second four-way valve is divided into two paths, one path is connected to one end of the second fin heat exchanger, and the other path is connected to one end of the tenth solenoid valve. The second fin heat exchanger is arranged in the second water tank, the other end of the second fin heat exchanger is connected to one end of the seventh solenoid valve, the other end of the seventh solenoid valve and the other end of the tenth solenoid valve are connected to one end of the eighth solenoid valve and the ninth solenoid valve respectively, and the other end of the ninth solenoid valve is connected to one end of the fourth fin heat exchanger. The fourth fin heat exchanger is arranged in the second water tank, the other end of the fourth fin heat exchanger is connected to the other end of the eighth solenoid valve and then connected to one end of the second expansion valve, the other end of the second expansion valve is connected to one end of the third fin heat exchanger, and the other end of the third fin heat exchanger is connected to end c of the second four-way valve, end a of the second four-way valve is connected to one end of the second compressor, the other end of the second compressor is connected to the second gas-liquid separator, and end d of the second four-way valve is connected to the second gas-liquid separator.

[0009] The heat pipe working medium circuit includes a first condenser, which is arranged in the third water tank, and the output end of the first condenser is divided into two paths, one path is connected to one end of the fifth solenoid valve, and the other path is connected to one end of the sixth solenoid valve, and the other end of the fifth solenoid valve is connected to the input end of the second condenser. It includes a liquid reservoir, and the input end of the liquid reservoir is divided into two paths, one path is connected to the output end of the second condenser, and the other path is connected to the output end of the third condenser. The third condenser is arranged in the second water tank, and the input end of the third condenser is connected to the other end of the sixth solenoid valve. The second condenser is placed in front of the air inlet direction of the third fin heat exchanger, the output end of the liquid reservoir is connected to the input end of the liquid pump, and the output end of the liquid pump is connected to the input end of the evaporator. The evaporator is placed at the center of the flue, and the output end of the evaporator is connected to one end of the fourth solenoid valve, and the other end of the fourth solenoid valve is connected to the input end of the first condenser.

[0010] The water pipeline includes a first solenoid valve and a first float valve, which are arranged on the water inlet pipe of the first water tank; includes a first water pump, a second solenoid valve and a second float valve, which are arranged on the water inlet pipe between the first water tank and the second water tank; includes a second water pump, a third solenoid valve and a third float valve, which are arranged on the water inlet pipe between the second water tank and the third water tank; includes a fourth water pump and a fourth float valve, which are arranged on the water inlet pipe between the third water tank and the fourth water tank.

[0011] The water pipeline includes a fifth water pump and a second electronic temperature control valve, and the fifth water pump and the second electronic temperature control valve are arranged on the return pipe between the third water tank and the fourth water tank.

[0012] A method for using a heat recovery type catering kitchen air conditioning system, characterized by including four modes of outdoor temperature from high to low:

[0013] a. When the air-conditioning hot water supply mode is in operation in the spring catering kitchen: the heating automatic control device is controlled to heat the fourth water tank, the sewage waste heat recovery device is controlled to recover waste heat from the sewage and heat the first water tank, and the heat pipe working medium circuit is controlled to recover waste heat from the flue and heat the third water tank and the second water tank;

[0014] b. In the summer, when the air conditioning and hot water supply mode is in operation in the catering kitchen: the heating automatic control device is controlled to heat the fourth water tank, the heat pipe working medium circuit is controlled to recover the waste heat from the flue and heat the third and second water tanks, and the air conditioning refrigerant circuit is controlled to heat the second water tank;

[0015] c. When the catering kitchen is operating in the air conditioning heating and hot water supply mode in autumn: the heating automatic control device is controlled to heat the fourth water tank, the sewage waste heat recovery device is controlled to recover waste heat from the sewage, and the first water tank is heated, and the heat pipe working medium circuit is controlled to recover waste heat from the flue and heat the third water tank and the second condenser;

[0016] d. When the catering kitchen air conditioning heating and hot water supply mode is running in winter: control the heating automatic control device to heat the fourth water tank, control the sewage waste heat recovery device to recover waste heat from sewage, heat the first water tank, control the heat pipe working fluid circuit to recover waste heat from the flue, heat the third water tank and the second condenser, and control the air conditioning refrigerant circuit to extract heat from the third water tank.

[0017] The beneficial effects of the present invention: The present invention provides a heat recovery type catering kitchen air-conditioning system and a method of using the same. The system consists of a sewage waste heat recovery device, a heating automatic control device, a heat pipe working fluid circuit, an air-conditioning refrigerant circuit and a water pipeline. The system fully recovers the waste heat of the kitchen flue, sewage pipe and air-conditioning condensation heat, efficiently prepares kitchen hot water and uses it as a cold source and heat source for air conditioning for heating, ventilation and cooling in the kitchen in all four seasons, which can improve the operating efficiency of the heat pump system, reduce operating energy consumption and solve the problem of hot water supply in the kitchen throughout the year; the present invention is equipped with four water tanks, and the temperatures of the four water tanks increase layer by layer, which realizes multi-stage recovery of heat while meeting the heat recovery requirements, thereby improving the heat recovery efficiency; the present invention is designed with four working modes according to the climate changes and hot water demand throughout the year, namely, spring hot water supply, summer air-conditioning cooling and hot water supply, autumn heating and hot water supply, and winter air-conditioning heating and hot water supply. In the spring hot water supply mode, since the temperature and humidity of the fresh air in spring are suitable, there is no need to process the fresh air. A large amount of fresh air can be directly introduced into the kitchen to meet indoor comfort conditions. At this time, the system only needs to control the sewage waste heat recovery device to heat the water in the first water tank and control the heat pipe working medium circuit to heat the water in the second and third water tanks. Since there is a certain temperature difference between the water in the second and third water tanks, multi-stage recovery of flue heat is achieved, improving heat recovery efficiency. The heating automatic control device regulates the temperature of the hot water in the water tank, which can automatically heat and meet the kitchen's spring demand for hot water. In the summer air conditioning cooling and hot water supply mode, since the temperature of the fresh air outside is relatively high in summer, the fresh air needs to be regulated in temperature and humidity by the air conditioning system before being sent indoors. In the present invention, the traditional outdoor air is not used as the cold source for air conditioning, but the water in the second water tank is used as the cold source for the air conditioning system. In the summer, kitchens often use room-temperature water for washing dishes, eliminating the need to operate the waste heat recovery device in the sewer. Consequently, the water in the second water tank remains at approximately 20 degrees Celsius, serving as a cooling source for the air conditioning refrigerant circuit. The hot water system not only recovers the condensation heat from the air conditioning, but also significantly improves the air conditioning's cooling efficiency due to the reduced temperature of the cooling source. The hot water system then controls the heat pipe working medium circuit to heat the water in the second and third water tanks, and controls the automatic heating control device to regulate the temperature of the hot water in the water tanks, thus meeting the kitchen's summer hot water needs. In autumn heating and hot water supply mode, since it is relatively cold during the winter, direct fresh air delivery to the room would be cold and uncomfortable. The present invention provides a condenser at the kitchen's fresh air inlet to heat the kitchen's autumn fresh air, meeting the autumn heating needs without requiring the air conditioning system to operate. This significantly reduces autumn energy consumption in the kitchen while improving indoor thermal comfort. At this time, the hot water system only needs to control the sewage waste heat recovery device to heat the water in the first water tank, control the heat pipe working fluid circuit to heat the water in the second water tank, and use the second condenser to heat the fresh air. The heating automatic control device adjusts the hot water temperature in the fourth water tank to meet the kitchen's demand for hot water in autumn.In winter, during air conditioning heating and hot water supply mode, due to the extremely low outdoor air temperature, using outdoor air as a heat source to heat the fresh air not only results in low air conditioning energy efficiency but also easily causes fin frosting, requiring the air conditioner to have a defrost cycle. The present invention uses the hot water in the third water tank as the heat source for the air conditioning refrigerant circuit. Since the hot water in the third water tank directly recovers heat from the high-temperature flue and sewage pipe, using it as a winter air conditioning heat source significantly improves the air conditioning system's operating energy efficiency while also avoiding the problem of fin frosting during winter heating. Furthermore, the present invention provides a condenser at the kitchen's fresh air inlet to preheat the kitchen's fresh air in winter, significantly improving the air conditioning's operating efficiency. In this case, the hot water system only needs to control the sewage waste heat recovery device to heat the water in the first water tank, control the heat pipe working fluid circuit to heat the water in the second water tank while using the second condenser to preheat the fresh air, and control the heating automatic control device to regulate the temperature of the hot water in the fourth water tank to meet the kitchen's winter hot water needs. The four working modes of the system of the present invention not only efficiently recycle and utilize the waste heat of the kitchen throughout the year, but also meet the kitchen's air conditioning and hot water supply needs throughout the year, greatly reducing the kitchen's energy consumption throughout the year. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a framework diagram of a heat recovery catering kitchen air conditioning system according to the present invention.

[0019] The reference numerals in the figure are as follows: 1-sewage channel; 2-plate heat exchanger; 3-first expansion valve; 4-first water tank; 4a-first water tank input end; 4b-first water tank output end; 5-first solenoid valve; 6-first float valve; 7-first fin heat exchanger; 8-first compressor; 9-first four-way valve; 10-first gas-liquid separator; 11-first water pump; 12-second solenoid valve; 13-second float valve; 14-second water tank; 14a-second Water tank input end; 14b-second water tank output end; 15-second water pump; 16-third solenoid valve; 17-third float valve; 18-third water tank; 18a-third water tank first input end; 18b-third water tank second input end; 18c-third water tank first output end; 19-first electronic temperature control valve; 20-third water pump; 21-fourth water tank; 21a-fourth water tank first input end; 21b-fourth water tank second input end; 21c-fourth water tank First output terminal of the fourth water tank; 22-fourth water pump; 23-fourth float valve; 24-fifth water pump; 25-second electronic temperature control valve; 26-live wire connector; 27-protection switch; 28-single-pole double-throw switch; 29-controller; 30-signal converter; 31-temperature sensor; 32-heating resistor; 33-fuse; 34-neutral wire connector; 35-flue; 36-liquid pump; 37-evaporator; 38-fourth solenoid valve; 39-first Condenser; 10-fifth solenoid valve; 41-second condenser; 42-liquid reservoir; 43-sixth solenoid valve; 44-third condenser; 45-second compressor; 46-second four-way valve; 47-second fin heat exchanger; 48-seventh solenoid valve; 49-eighth solenoid valve; 50-second expansion valve; 51-third fin heat exchanger; 52-second gas-liquid separator; 53-fourth fin heat exchanger; 54-ninth solenoid valve; 55-tenth solenoid valve. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0021] like Figure 1 As shown, the present invention discloses a heat recovery type catering kitchen air-conditioning system, which is composed of a sewage waste heat recovery device, a heating automatic control device, a heat pipe working medium circuit, an air-conditioning refrigerant circuit and a water pipeline. It also includes a first water tank 4, a second water tank 14, a third water tank 18 and a fourth water tank 21 connected in sequence through the water pipeline. The first water tank 4 and the fourth water tank 21 are used for water intake and water supply, respectively.

[0022] In the sewage waste heat recovery device, the output end of the first compressor 8 is connected to the first input end 9a of the first four-way valve 9; the input end of the first fin heat exchanger 7 is connected to the first output end 9b of the first four-way valve 9; the plate heat exchanger 2 is connected to the second input end 9c of the first four-way valve 9; the second output end 9d of the first four-way valve 9 is connected to the input end of the first gas-liquid separator 10, the input end of the plate heat exchanger 2 is connected to one end of the first expansion valve 3, and the other end of the first expansion valve 3 is connected to the output end of the first fin heat exchanger 7, the first fin heat exchanger 7 is arranged in the first water tank 4, and the input end of the first compressor 8 is connected to the first gas-liquid separator 10.

[0023] The heat pipe working medium circuit includes a first condenser 39, which is arranged in the third water tank 18. The output end of the first condenser 39 is divided into two paths, one of which is connected to one end of the fifth solenoid valve 40, and the other is connected to one end of the sixth solenoid valve 43. The other end of the fifth solenoid valve 40 is connected to the input end of the second condenser 41, including a liquid reservoir 42. The input end of the liquid reservoir 42 is divided into two paths, one of which is connected to the output end of the second condenser 41, and the other is connected to the output end of the third condenser 44. The condenser 44 is arranged in the second water tank 14, the input end of the third condenser 44 is connected to the other end of the sixth solenoid valve 43, the second condenser 41 is placed in front of the third fin heat exchanger 51 in the air intake direction, the output end of the liquid reservoir 42 is connected to the input end of the liquid pump 36, the output end of the liquid pump 36 is connected to the input end of the evaporator 37, the evaporator 37 is placed at the center of the flue 35, the output end of the evaporator 37 is connected to one end of the fourth solenoid valve 38, and the other end of the fourth solenoid valve 38 is connected to the input end of the first condenser 39.

[0024] The air conditioning refrigerant circuit includes a second four-way valve 46. The end b of the second four-way valve 46 is divided into two paths, one of which is connected to one end of the second fin heat exchanger 47, and the other is connected to one end of the tenth solenoid valve 55. The second fin heat exchanger 47 is arranged in the second water tank 14. The other end of the second fin heat exchanger 47 is connected to one end of the seventh solenoid valve 48. The other end of the seventh solenoid valve 48 and the other end of the tenth solenoid valve 55 are connected to one end of the eighth solenoid valve 49 and the ninth solenoid valve 54 respectively. The other end of the ninth solenoid valve 54 is connected to one end of the fourth fin heat exchanger 53. The fourth fin heat exchanger 53 is arranged in the second water tank 18, the other end of the fourth fin heat exchanger 53 is connected to the other end of the eighth solenoid valve 49 and then connected to one end of the second expansion valve 50, the other end of the second expansion valve 50 is connected to one end of the third fin heat exchanger 51, the other end of the third fin heat exchanger 51 is connected to the c end of the second four-way valve 46, the a end of the second four-way valve 46 is connected to one end of the second compressor 45, the other end of the second compressor 45 is connected to the second gas-liquid separator 52, and the d end of the second four-way valve 46 is connected to the second gas-liquid separator 52.

[0025] In the water pipeline, the first water pump 11 and the second float valve 13 are controlled in a linkage manner; the second water pump 15 and the third float valve 17 are controlled in a linkage manner; the third water pump 20 and the first electronic temperature control valve 19 are controlled in a linkage manner; the fourth water pump 22 and the fourth float valve 23 are controlled in a linkage manner; the fifth water pump 24 and the second electronic temperature control valve 25 are controlled in a linkage manner; the temperature of the first electronic temperature control valve 19 is set to 50°C; the temperature of the second electronic temperature control valve 25 is set to 2°C; the second float valve 13 is connected to the input end 14a of the second water tank 14; the input end of the second water pump 15 is connected to the output end 14b of the second water tank 14 connection; the third float valve 17 is connected to the first input end 18a of the third water tank 18; the first electronic temperature control valve 19 is connected to the first output end 18c of the third water tank 18; the second electronic temperature control valve 25 is connected to the second input end 18b of the third water tank 18; the input end of the fourth water pump 22 is connected to the second output end 18d of the third water tank 18; the output end of the third water pump 20 is connected to the second input end 21b of the fourth water tank 21; the fourth float valve 23 is connected to the first input end 21a of the fourth water tank 21; the input end of the fifth water pump 24 is connected to the first output end 21c of the fourth water tank 21.

[0026] The automatic heating control device includes a controller 29, the input end of the controller 29 is connected to the output end of the signal converter 30, the input end of the signal converter 30 is connected to the temperature sensor 31, the input end of the controller 29 is connected to the single-pole double-throw switch 28, one end of the single-pole double-throw switch 28 is connected to the protection switch 27, the fuse 33 and one end of the resistor 32 in sequence, the other end of the resistor 32 is connected to the other end of the single-pole double-throw switch 28, the protection switch 27 is provided with a live wire connector 26 and a neutral wire connector 34, and the temperature sensor 31 and the resistor 32 are arranged in the fourth water tank 21.

[0027] The present invention also discloses a method for using a heat recovery type catering kitchen air conditioning system, which includes four modes of outdoor temperature from high to low:

[0028] 1. When the air conditioning hot water supply mode is in operation in the spring catering kitchen: the first solenoid valve 5, the second solenoid valve 12, the third solenoid valve 16, the fourth solenoid valve 38, and the sixth solenoid valve 43 are open, and the fifth solenoid valve 40, the seventh solenoid valve 48, the eighth solenoid valve 49, the ninth solenoid valve 54, and the tenth solenoid valve 55 are closed;

[0029] The waste heat recovery device for sewage, the low-temperature and low-pressure refrigerant gas in the refrigerant circuit is sucked into the first compressor 8 from the first gas-liquid separator 10, compressed and turned into high-temperature and high-pressure superheated steam and discharged, and then enters the first fin heat exchanger 7 through the first four-way valve 9. In the first fin heat exchanger 7, the refrigerant steam condenses and releases heat to heat the water in the first water tank 7, and then passes through the first expansion valve 3. At this time, the low-temperature and low-pressure liquid refrigerant enters the plate heat exchanger 2 to absorb the heat of the wastewater in the sewage channel 1, evaporates into superheated steam, and then flows out, passes through the first four-way valve 9 into the first gas-liquid separator 10, and then is sucked into the first compressor 8 again;

[0030] In the automatic heating control device, the temperature of the water to be heated in the fourth water tank 21 is input into the controller 29, and the temperature sensor 31 transmits the measured temperature signal to the signal converter 30. At this time, the signal converter 30 converts the obtained temperature signal into an electrical signal and inputs it into the controller 29. If the temperature is higher than the set temperature, the controller 29 controls the single-pole double-throw switch 28 to be disconnected, and the heating resistor 32 does not work. If the temperature is lower than the set value, the controller 29 controls the single-pole double-throw switch 28 to be closed, and the heating resistor 32 works. At this time, current flows from the live wire connector 26, passes through the protection switch 27 and the single-pole double-throw switch 28, and flows through the heating resistor 32. The resistor generates heat to heat the water in the fourth water tank 21.

[0031] In the heat pipe working medium circuit, the low-temperature liquid working medium in the liquid reservoir 42 is pressed into the evaporator 37 of the flue 35 by the liquid pump 36. At this time, the low-temperature liquid working medium absorbs the heat of the high-temperature flue gas in the flue 35 and evaporates. It enters the first condenser 39 in the third water tank 18 through the fourth solenoid valve 38. The high-temperature gaseous working medium releases heat to the water in the third water tank 18 to achieve the purpose of heating the water. The medium-temperature working medium coming out of the first condenser 39 passes through the sixth solenoid valve 43 and enters the third condenser 44 to release heat again to the water in the second water tank 14 to achieve complete cooling. At this time, the low-temperature liquid working medium in the third condenser 44 enters the liquid reservoir 42 and is then pressed into the evaporator 37 again by the liquid pump 36. In this way, the cycle is achieved.

[0032] Tap water in the water pipeline passes through first solenoid valve 5 and first float valve 6 and enters first water tank 4. The water in first water tank 4, driven by first water pump 11, flows through second solenoid valve 12 and second float valve 13 and enters second water tank 14. After preheating, the water in the second water tank, driven by second water pump 15, passes through third solenoid valve 16 and third float valve 17 and enters third water tank 18. If the water temperature in the water tanks reaches 50°C, the water in third water tank 18 passes through first electronic temperature control valve 19 and third water pump 20 and enters fourth water tank 21. If the water level in the fourth water tank falls below a certain level, the water in third water tank 18, driven by fourth water pump 22, flows through fourth float valve 23 and enters fourth water tank 21. In this mode, the air conditioner refrigerant circuit does not need to operate.

[0033] 2. When the air conditioning and hot water supply mode of the catering kitchen is in operation in summer: the first solenoid valve 5, the second solenoid valve 12, the third solenoid valve 16, the fourth solenoid valve 38, the sixth solenoid valve (43), the seventh solenoid valve 48, and the eighth solenoid valve 49 are open, and the fifth solenoid valve 40, the ninth solenoid valve 54, and the tenth solenoid valve 55 are closed. In the automatic heating control device, the water temperature required to be heated in the fourth water tank 21 is input into the controller 29, and the temperature sensor 31 transmits the measured temperature signal to the signal converter 30. At this time, the signal converter 30 converts the obtained temperature signal into an electrical signal and inputs it into the controller 29. If the temperature is higher than the set temperature, the controller 29 controls the single-pole double-throw switch 28 to be disconnected, and the heating resistor 32 does not work. If the temperature is lower than the set value, the controller 29 controls the single-pole double-throw switch 28 to be closed, and the heating resistor 32 works. At this time, current flows from the live wire connector 26, passes through the protection switch 27 and the single-pole double-throw switch 28, and flows through the heating resistor 32. The resistor generates heat and heats the water in the fourth water tank 21.

[0034] In the heat pipe working medium circuit, the low-temperature liquid working medium in the liquid reservoir 42 is pressed into the evaporator 37 of the flue 35 by the liquid pump 36. At this time, the low-temperature liquid working medium absorbs the heat of the high-temperature flue gas in the flue 35 and evaporates through the fourth solenoid valve 38 to enter the first condenser 39 in the third water tank 18. The high-temperature gaseous working medium releases heat to the water in the third water tank 18 to achieve the purpose of heating the water. The medium-temperature working medium coming out of the first condenser 39 passes through the sixth solenoid valve 43 and enters the third condenser 44 to release heat to the water in the second water tank 14 again to achieve complete cooling. At this time, the low-temperature liquid working medium in the third condenser 44 enters the liquid reservoir 42 and is then pressed into the evaporator 37 again by the liquid pump 36, thus achieving a cycle.

[0035] The low-temperature and low-pressure refrigerant gas in the air-conditioning refrigerant circuit is sucked into the second compressor 45 from the second gas-liquid separator 52, compressed and turned into high-temperature and high-pressure superheated steam and discharged, and enters the second fin heat exchanger 47 through the second four-way valve 46. In the second fin heat exchanger 47, the refrigerant steam condenses and releases heat to heat the water in the second water tank 14, and then enters the second expansion valve 50 through the seventh solenoid valve 48 and the eighth solenoid valve 49. At this time, the low-temperature and low-pressure liquid refrigerant enters the third fin heat exchanger 51 to absorb the heat in the fresh air supplied from the kitchen, evaporates into superheated steam and flows out, passes through the second four-way valve 46 and enters the second gas-liquid separator 52, and then is sucked into the second compressor 45 again.

[0036] Tap water in the water pipeline passes through first solenoid valve 5 and first float valve 6 and enters first water tank 4. The water in first water tank 4, driven by first water pump 11, passes through second solenoid valve 12 and second float valve 13 and enters second water tank 14. After preheating, the water in the second water tank, driven by second water pump 15, passes through third solenoid valve 16 and third float valve 17 and enters third water tank 18. If the water temperature in the water tanks reaches 50°C, the water in third water tank 18 passes through first electronic temperature control valve 19 and third water pump 20 and enters fourth water tank 21. If the water level in the fourth water tank falls below a certain level, the water in third water tank 18, driven by fourth water pump 22, passes through fourth float valve 23 and enters fourth water tank 21. In this mode, the wastewater waste heat recovery device does not need to operate.

[0037] 3. When the air conditioning heating and hot water supply mode is in operation in the autumn catering kitchen: the first solenoid valve 5, the second solenoid valve 12, the third solenoid valve 16, the fourth solenoid valve 38, and the fifth solenoid valve 40 are open, and the sixth solenoid valve 43, the seventh solenoid valve 48, the eighth solenoid valve 49, the ninth solenoid valve 54, and the tenth solenoid valve 55 are closed;

[0038] The waste heat recovery device for sewage, the low-temperature and low-pressure refrigerant gas in the refrigerant circuit is sucked into the first compressor 8 from the first gas-liquid separator 10, compressed and turned into high-temperature and high-pressure superheated steam and discharged, and then enters the first fin heat exchanger 7 through the first four-way valve 9. In the first fin heat exchanger 7, the refrigerant steam condenses and releases heat to heat the water in the first water tank 7, and then passes through the first expansion valve 3. At this time, the low-temperature and low-pressure liquid refrigerant enters the plate heat exchanger 2 to absorb the heat of the wastewater in the sewage channel and evaporates into superheated steam before flowing out, passing through the first four-way valve 9 and entering the first gas-liquid separator 10, and then being sucked into the first compressor 8 again;

[0039] In the automatic heating control device, the temperature of the water to be heated in the fourth water tank 21 is input into the controller 29, and the temperature sensor 31 transmits the measured temperature signal to the signal converter 30. At this time, the signal converter 30 converts the obtained temperature signal into an electrical signal and inputs it into the controller 29. If the temperature is higher than the set temperature, the controller 29 controls the single-pole double-throw switch 28 to be disconnected, and the heating resistor 32 does not work. If the temperature is lower than the set value, the controller 29 controls the single-pole double-throw switch 28 to be closed, and the heating resistor 32 works. At this time, current flows from the live wire connector 26, passes through the protection switch 27 and the single-pole double-throw switch 28, and flows through the heating resistor 32. The resistor generates heat to heat the water in the fourth water tank 21.

[0040] In the heat pipe working medium circuit, the low-temperature liquid working medium in the liquid reservoir 42 is pressed into the evaporator 37 of the flue 35 by the liquid pump 36. At this time, the low-temperature liquid working medium absorbs the heat of the high-temperature flue gas in the flue 35 and evaporates. It enters the first condenser 39 in the third water tank 18 through the fourth solenoid valve 38. The high-temperature gaseous working medium releases heat to the water in the third water tank 18 to achieve the purpose of heating the water. The medium-temperature working medium coming out of the first condenser 39 passes through the fifth solenoid valve 40 and enters the second condenser 41 to release heat to the fresh air again, achieving complete cooling. At this time, the low-temperature liquid working medium in the second condenser 41 enters the liquid reservoir 42 and is again pressed into the evaporator 37 by the liquid pump 36, thus achieving a cyclic operation.

[0041] Tap water in the water pipeline passes through first solenoid valve 5 and first float valve 6 and enters first water tank 4. The water in first water tank 4, driven by first water pump 11, passes through second solenoid valve 12 and second float valve 13 and enters second water tank 14. The water in second water tank 14, driven by second water pump 15, passes through third solenoid valve 16 and third float valve 17 and enters third water tank 18. If the water temperature in the water tanks reaches 50°C, the water in third water tank 18 passes through first electronic temperature control valve 19 and third water pump 20 and enters fourth water tank 21. If the water level in the fourth water tank falls below a certain level, the water in third water tank 18, driven by fourth water pump 22, passes through fourth float valve 23 and enters fourth water tank 21. In this mode, the air conditioner refrigerant circuit does not need to operate.

[0042] 4. When the air conditioning, heating and hot water supply mode of the catering kitchen is in operation in winter: the first solenoid valve 5, the second solenoid valve 12, the third solenoid valve 16, the fourth solenoid valve 38, the fifth solenoid valve 40, the ninth solenoid valve 54, and the tenth solenoid valve 55 are open, and the sixth solenoid valve 43, the seventh solenoid valve 48, and the eighth solenoid valve 49 are closed;

[0043] The waste heat recovery device for sewage, the low-temperature and low-pressure refrigerant gas in the refrigerant circuit is sucked into the first compressor 8 from the first gas-liquid separator 10, compressed and turned into high-temperature and high-pressure superheated steam and discharged, and enters the first fin heat exchanger 7 through the first four-way valve 9. In the first fin heat exchanger 7, the refrigerant steam condenses and releases heat to heat the water in the first water tank 7, and then passes through the first expansion valve 3. At this time, the low-temperature and low-pressure liquid refrigerant enters the plate heat exchanger 2 to absorb the heat of the wastewater in the sewage channel and evaporates into superheated steam and flows out, passes through the first four-way valve 9 and enters the first gas-liquid separator 10, and then is sucked into the first compressor 8 again; in the automatic heating control device, the water temperature required to be heated in the fourth water tank 21 is input into the controller 29,

[0044] The temperature sensor 31 transmits the measured temperature signal to the signal converter 30. The signal converter 30 converts the obtained temperature signal into an electrical signal and inputs it into the controller 29. If the temperature is higher than the set temperature, the controller 29 controls the single-pole double-throw switch 28 to be disconnected, and the heating resistor 32 does not work. If the temperature is lower than the set value, the controller 29 controls the single-pole double-throw switch 28 to be closed, and the heating resistor 32 works. At this time, current flows from the live wire connector 26, passes through the protection switch 27 and the single-pole double-throw switch 28, and flows through the heating resistor 32. The resistor generates heat to heat the water in the fourth water tank 21.

[0045] In the heat pipe working medium circuit, the low-temperature liquid working medium in the liquid reservoir 42 is pressed into the evaporator 37 of the flue 35 by the liquid pump 36. At this time, the low-temperature liquid working medium absorbs the heat of the high-temperature flue gas in the flue 35 and evaporates. It enters the first condenser 39 in the third water tank 18 through the fourth solenoid valve 38. The high-temperature gaseous working medium releases heat to the water in the third water tank 18 to achieve the purpose of heating the water. The medium-temperature working medium coming out of the first condenser 39 passes through the fifth solenoid valve 40 and enters the second condenser 41 to release heat to the fresh air again, achieving complete cooling. At this time, the low-temperature liquid working medium in the second condenser 41 enters the liquid reservoir 42 and is again pressed into the evaporator 37 by the liquid pump 36, thus achieving a cyclic operation.

[0046] The low-temperature, low-pressure refrigerant gas in the air-conditioning refrigerant circuit is sucked from the second gas-liquid separator 52 by the second compressor 45, compressed and turned into high-temperature, high-pressure superheated steam and discharged, and then enters the third fin heat exchanger 51 through the second four-way valve 46. In the third fin heat exchanger 51, the refrigerant steam condenses and releases heat to heat the kitchen fresh air, and then passes through the second expansion valve 50 to become a low-temperature, low-pressure liquid refrigerant. At this time, the low-temperature, low-pressure liquid refrigerant enters the fourth fin heat exchanger 53 to absorb the heat of the hot water in the third water tank 18, evaporates into superheated steam, and then flows out, passes through the ninth solenoid valve (54) and the tenth solenoid valve 55, enters the second gas-liquid separator 52, and then is sucked into the second compressor 45 again. Tap water in the water pipeline passes through the first solenoid valve 5 and the first float valve 6 and enters the first water tank 4. The water in the first water tank 4, driven by the first water pump 11, passes through the second solenoid valve 12 and the second float valve 13 and enters the second water tank 14. The water in the second water tank, driven by the second water pump 15, passes through the third solenoid valve 16 and the third float valve 17 and enters the third water tank 18. If the water temperature in the water tanks reaches 50°C, the water in the third water tank 18 passes through the first electronic temperature control valve 19 and the third water pump 20 and enters the fourth water tank 21. If the water level in the fourth water tank 21 falls below a certain level, the water in the third water tank 18 passes through the fourth float valve 23 and enters the fourth water tank 21 under the action of the fourth water pump 22. To prevent the water in the third water tank 18 from freezing and damaging the heat exchanger, if the water temperature in the third water tank 18 falls below 2°C, the water in the fourth water tank 21 passes through the second electronic temperature control valve 25 and enters the third water tank 18 under the action of the fifth water pump 24.

[0047] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A heat recovery catering kitchen air conditioning system, characterized by: The invention comprises a first water tank (4), a second water tank (14), a third water tank (18) and a fourth water tank (21) which are sequentially connected through a water pipeline, wherein the first water tank (4) and the fourth water tank (21) are used for water intake and water supply, respectively. The invention also comprises a sewage waste heat recovery device, a heating automatic control device, a heat pipe working medium circuit, and an air conditioning refrigerant circuit. The second condenser (41) of the heat pipe working medium circuit is arranged at the air inlet of the kitchen and is used to heat the fresh air in the kitchen. The sewage waste heat recovery device recovers waste heat from the sewage and is used to heat the first The water tank (4) is heated, the heating automatic control device is arranged on the fourth water tank (21) and is used to heat the fourth water tank (21), the heat pipe working medium circuit recovers waste heat from the flue (35) and is used to heat the third water tank (18) and the second water tank (14) alone or to heat the third water tank (18) and the second condenser (41) alone, and the air conditioning refrigerant circuit is used to heat the second water tank (14) alone or to absorb heat from the third water tank (18) alone; The sewage waste heat recovery device comprises a first four-way valve (9), one input end of the first four-way valve (9) is connected to the output end of the first compressor (8), the other input end is connected to the output end of the plate heat exchanger (2), one output end of the first four-way valve (9) is connected to the input end of the first fin heat exchanger (7), and the other output end is connected to the first gas-liquid separator (10), the plate heat exchanger (2) is arranged in the sewage channel (1), the input end of the plate heat exchanger (2) is connected to one end of the first expansion valve (3), the other end of the first expansion valve (3) is connected to the output end of the first fin heat exchanger (7), the first fin heat exchanger (7) is arranged in the first water tank (4), the input end of the first compressor (8) is connected to the first gas-liquid separator (10) connection; the heating automatic control device includes a controller (29), the input end of the controller (29) is connected to the output end of the signal converter (30), the input end of the signal converter (30) is connected to the temperature sensor (31), the input end of the controller (29) is connected to the single-pole double-throw switch (28), one end of the single-pole double-throw switch (28) is connected to the protection switch (27), the fuse (33) and one end of the resistance wire (32) in sequence, the other end of the resistance wire (32) is connected to the other end of the single-pole double-throw switch (28), the connection protection switch (27) is provided with a live wire connector (26) and a neutral wire connector (34), the temperature sensor (31) and the resistance wire (32) are provided in the fourth water tank (21); The air conditioning refrigerant circuit includes a second four-way valve (46), the b end of the second four-way valve (46) is divided into two paths, one path is connected to one end of the second fin heat exchanger (47), and the other path is connected to one end of the tenth solenoid valve (55), the second fin heat exchanger (47) is arranged in the second water tank (14), the other end of the second fin heat exchanger (47) is connected to one end of the seventh solenoid valve (48), the other end of the seventh solenoid valve (48) and the other end of the tenth solenoid valve (55) are connected to one end of the eighth solenoid valve (49) and the ninth solenoid valve (54), respectively, and the other end of the ninth solenoid valve (54) is connected to the fourth fin heat exchanger (53). The fourth fin heat exchanger (53) is arranged in the third water tank (18), the other end of the fourth fin heat exchanger (53) is connected to the other end of the eighth solenoid valve (49) and then connected to one end of the second expansion valve (50), the other end of the second expansion valve (50) is connected to one end of the third fin heat exchanger (51), the other end of the third fin heat exchanger (51) is connected to the c end of the second four-way valve (46), the a end of the second four-way valve (46) is connected to one end of the second compressor (45), the other end of the second compressor (45) is connected to the second gas-liquid separator (52), the d end of the second four-way valve (46) is connected to the The second gas-liquid separator (52) is connected; the heat pipe working medium circuit includes a first condenser (39), the first condenser (39) is arranged in the third water tank (18), the output end of the first condenser (39) is divided into two paths, one path is connected to one end of the fifth solenoid valve (40), and the other path is connected to one end of the sixth solenoid valve (43), the other end of the fifth solenoid valve (40) is connected to the input end of the second condenser (41), including a liquid reservoir (42), the input end of the liquid reservoir (42) is divided into two paths, one path is connected to the output end of the second condenser (41), and the other path is connected to the output end of the third condenser (44), the third condenser The device (44) is arranged in the second water tank (14), the input end of the third condenser (44) is connected to the other end of the sixth solenoid valve (43), the second condenser (41) is placed in front of the air intake direction of the third fin heat exchanger (51), the output end of the liquid storage device (42) is connected to the input end of the liquid pump (36), the output end of the liquid pump (36) is connected to the input end of the evaporator (37), the evaporator (37) is placed at the center of the flue (35), the output end of the evaporator (37) is connected to one end of the fourth solenoid valve (38), and the other end of the fourth solenoid valve (38) is connected to the input end of the first condenser (39).

2. The heat recovery type catering kitchen air conditioning system according to claim 1 is characterized in that: The waterway pipeline comprises a first solenoid valve (5) and a first float valve (6), the first solenoid valve (5) and the first float valve (6) being arranged on the water inlet pipeline of the first water tank (4); a first water pump (11), a second solenoid valve (12) and a second float valve (13), the first water pump (11), the second solenoid valve (12) and the second float valve (13) being arranged on the water inlet pipeline between the first water tank (4) and the second water tank (14); a second water pump (15), a third solenoid valve (16) and a third float valve (17), the second water pump (15), the third solenoid valve (16) and the third float valve (17) being arranged on the water inlet pipeline between the second water tank (14) and the third water tank (18); and a fourth water pump (22) and a fourth float valve (23), the fourth water pump (22) and the fourth float valve (23) being arranged on the water inlet pipeline between the third water tank (18) and the fourth water tank (21).

3. The heat recovery type catering kitchen air conditioning system according to claim 2, characterized in that: The water pipeline comprises a fifth water pump (24) and a second electronic temperature control valve (25), and the fifth water pump (24) and the second electronic temperature control valve (25) are arranged on the return water pipeline between the third water tank (18) and the fourth water tank (21).

4. A method for using the heat recovery catering kitchen air conditioning system according to any one of claims 1 to 3, characterized in that: There are four modes including outdoor temperature from high to low: a. When the air-conditioning hot water supply mode of the catering kitchen is in operation in spring: the heating automatic control device is controlled to operate to heat the fourth water tank (21), the sewage waste heat recovery device is controlled to recover waste heat from the sewage, the first water tank (4) is heated, the heat pipe working medium circuit is controlled to recover waste heat from the flue (35), and the third water tank (18) and the second water tank (14) are heated; b. When the air conditioning refrigeration and hot water supply mode of the catering kitchen is in operation in summer: the heating automatic control device is controlled to operate to heat the fourth water tank (21), the heat pipe working medium circuit is controlled to recover waste heat from the flue (35), the third water tank (18) and the second water tank (14) are heated, and the air conditioning refrigerant circuit is controlled to heat the second water tank (14); c. When the air conditioning heating and hot water supply mode of the catering kitchen is in operation in autumn: the heating automatic control device is controlled to operate to heat the fourth water tank (21), the sewage waste heat recovery device is controlled to recover waste heat from the sewage, the first water tank (4) is heated, the heat pipe working medium circuit is controlled to recover waste heat from the flue (35), and the third water tank (18) and the second condenser (41) are heated; d. When the catering kitchen is operated in the air-conditioning heating and hot water supply mode in winter: the heating automatic control device is controlled to heat the fourth water tank (21), the sewage waste heat recovery device is controlled to recover waste heat from sewage, the first water tank (4) is heated, the heat pipe working medium circuit is controlled to recover waste heat from the flue (35), the third water tank (18) and the second condenser (41) are heated, and the air-conditioning refrigerant circuit is controlled to extract heat from the third water tank (18).

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