Steam and cold water dual-purpose heat pump unit

Abstract

The utility model relates to a steam and cold water dual-purpose heat pump unit. The steam and cold water dual-purpose heat pump unit comprises a low-temperature-stage circulation unit, a high-temperature-stage circulation unit and a steam generation unit. In the circulation of the steam generation unit, tap water can be directly heated to 120 DEG C from 20 DEG C at a time from a preheater shared by the low-temperature-stage circulation unit to a first condenser and a second condenser, and large-temperature-difference heat exchange is achieved; meanwhile, system cold water provides a stable low-temperature cold source for a kitchen air conditioning system and a food refrigerated cabinet; a condensation-evaporator used for heat exchange between the low-temperature-stage circulation unit and the high-temperature-stage circulation unit adopts a three-channel design, and except for the low-temperature-stage circulation unit and the high-temperature-stage circulation unit, cold and heat conversion is carried out in common; and a waste heat inlet adjusting valve and a waste heat outlet adjusting valve of a third channel of the condensation-evaporator are opened, kitchen waste heat is discharged into the third channel, and the kitchen waste heat in the third channel is directly recycled through a high-temperature-level circulation unit. Cold and heat comprehensive utilization of the heat pump in the catering industry is achieved.

Description

Technical Field

[0001] The utility model relates to a heat pump technology, in particular to a heat pump unit that can be used for both steam and cold water. Background Art

[0002] With the increasing severity of the global energy crisis and environmental problems, energy conservation and carbon reduction have become one of the important development directions in all industries. Traditional kitchen equipment generally uses gas (such as natural gas, liquefied petroleum gas) as the main energy source, which not only has low energy utilization efficiency but also causes environmental pollution and the greenhouse effect, making it difficult to meet the current demand for high-efficiency energy-saving technologies.

[0003] In recent years, with the rapid development of renewable energy technologies and the clean transformation of the power system, using electric energy to drive equipment instead of traditional kitchen gas not only conforms to the national policy orientation of energy conservation and emission reduction but also is an inevitable trend to promote the transformation of green kitchens, optimize the energy structure, and improve energy utilization efficiency. At the same time, with the development of society and the improvement of people's living standards, the requirements of the catering industry for the kitchen environment and equipment are gradually increasing. Traditional steamers, disinfection cabinets, air conditioners, and food refrigerators in the kitchen are often set independently, with relatively single functions, and the kitchen is often filled with heat and oil fume, making it difficult to meet the urgent needs of modern kitchens for multi-functional integration, high-efficiency energy conservation, and comfort.

[0004] Facing this situation, heat pump technology, as an efficient energy conversion technology, has gradually attracted attention. Driven by electric energy, the hot end of the heat pump can provide heat energy, and at the same time, the cold end can achieve refrigeration, with good energy utilization efficiency. However, the current heat pump system has not been able to reasonably utilize the cold energy generated at the cold end. Therefore, developing an efficient heat pump system that integrates refrigeration, heating (steam), and waste heat recovery functions can not only meet the multi-functional needs of kitchen equipment but also greatly improve energy utilization efficiency, reduce the carbon emissions of the kitchen, conform to the current policy orientation of energy conservation and emission reduction, and provide strong support for the sustainable development of the catering industry. Summary of the Utility Model

[0005] In view of the problems that traditional kitchen equipment relies on gas as the main energy source, resulting in low energy utilization efficiency, environmental pollution and greenhouse effect, a steam and cold water dual-purpose heat pump unit is proposed. Using cascade heat pump technology and driven by electric energy, it directly raises the waste heat in the kitchen or low-grade heat energy in the environment to a high temperature state, generating high-temperature steam above 120°C to meet the needs of cooking and equipment disinfection in the kitchen. At the same time, the cold end of the system prepares cold water below 15°C to provide a stable low-temperature cold source for the kitchen air-conditioning system and food refrigerators. The unit is equipped with an intelligent temperature control system, and all functional modules can be independently controlled to meet the various functional requirements of modern kitchens for steam cooking, sterilization, food refrigeration, and kitchen air-conditioning. At the same time, it can realize the recovery of kitchen fume waste heat, and has the characteristics of high integration, good flexibility, compact structure, convenient installation and maintenance.

[0006] The technical solution of the present utility model is: a steam and cold water dual-purpose heat pump unit, including a low-temperature stage circulation unit, a high-temperature stage circulation unit, and a steam generation unit;

[0007] The low-temperature stage circulation unit includes an evaporator, a low-temperature compressor, a condensation-evaporator, a preheater, a liquid receiver, and a low-temperature expansion valve connected in sequence, and returns to the evaporator to form a closed-loop cycle;

[0008] The high-temperature stage circulation unit includes a high-temperature compressor, a first condenser, a second condenser, a high-temperature expansion valve, and a condensation-evaporator connected in sequence, and returns to the high-temperature compressor to form a closed-loop cycle;

[0009] The steam generation unit includes a makeup water pump and a first electric control valve, a flash tank, a second electric control valve, a circulation pump, a third electric control valve, a pressure gauge for testing pressure on the flash tank, a preheater, a first condenser, and a second condenser;

[0010] The low-temperature and low-pressure liquid refrigerant in the evaporator absorbs the heat of the kitchen environment and becomes low-temperature refrigerant steam, which enters the low-temperature compressor. In the low-temperature compressor, it becomes high-temperature and high-pressure steam and enters the condensation-evaporator and preheater in sequence, and releases the heat to the high-temperature stage circulation system. Then, it undergoes phase change cooling to become low-temperature and high-pressure liquid refrigerant, which flows into the liquid receiver. Part of the refrigerant in the liquid receiver flows into the low-temperature expansion valve, and after throttling and pressure reduction, it returns to the evaporator again to complete the circulation process of the low-temperature stage circulation unit;

[0011] The high-temperature stage circulation refrigerant absorbs the heat from the low-temperature stage through the condensation-evaporator and becomes refrigerant steam. After being compressed by the high-temperature compressor, it becomes high-temperature and high-pressure refrigerant steam and enters the first condenser and the second condenser in sequence. After cooling and temperature reduction, it becomes low-temperature and high-pressure liquid refrigerant, and returns to the condensation-evaporator after throttling and pressure reduction by the high-temperature expansion valve to complete the circulation process of the high-temperature stage circulation unit;

[0012] Tap water enters the preheater through a series-connected electric control valve and a make-up water pump, then enters the second condenser and the first condenser, absorbing the heat of the high-temperature stage. After absorbing heat, the water enters the flash tank. In the flash tank, the steam is transported to the user end through the second electric control valve. The unused high-temperature steam or hot water is pumped back into the second condenser through a series-connected third electric control valve and a circulation pump to complete the steam generation unit cycle.

[0013] Preferably, the condensation-evaporator adopts a three-channel design. The first channel is connected to the low-temperature stage circulation unit; the second channel is connected to the high-temperature circulation unit; the third channel is connected to the inlet and outlet of kitchen fume through a waste heat inlet control valve and a waste heat outlet control valve to recover the waste heat in the kitchen.

[0014] Preferably, the preheater is a plate heat exchanger. One side of the fluid is the low-temperature stage circulating working medium, and the other side is the tap water transported by the make-up water pump. The preheater uses the waste heat of the low-temperature stage circulating working medium to preheat the tap water. After the tap water is heated by the preheater and then passes through the first and second condensers, the tap water at 20°C is heated to 120°C at one time.

[0015] Preferably, the pipeline system of the evaporator circulates to various parts of the kitchen, directly absorbs the low-temperature heat in the kitchen environment or the refrigerator cabinet, and supplies cold to the cold-using equipment in the kitchen.

[0016] Preferably, the steam and cold water dual-purpose heat pump unit further includes an outdoor evaporator, which is connected in parallel with the evaporator to absorb the heat of the outdoor air and is used as a supplementary heat source.

[0017] Preferably, both the evaporator and the outdoor evaporator adopt finned evaporators, and the fans are frequency-converted for adjustment.

[0018] Preferably, the condensation-evaporator, the preheater, the first condenser, and the second condenser are all heat exchangers.

[0019] Preferably, the working medium in the high-temperature stage circulation unit is R245fa, and the working medium in the low-temperature stage circulation unit is R134a.

[0020] Preferably, both the low-temperature compressor and the high-temperature compressor adopt variable-frequency scroll compressors, and the temperature of the generated steam is controllable and adjustable.

[0021] The beneficial effects of the present utility model are as follows: The steam and cold water dual-purpose heat pump unit of the present utility model can generate high-temperature steam above 120°C, and at the same time generate cold water below 15°C to meet the cold demand in the kitchen, realizing the energy combination substitution of steam ovens, disinfection cabinets, air conditioners, and refrigerated cabinets, meeting various kitchen function requirements, improving the integration and use efficiency of kitchen equipment, and being particularly suitable for modern central kitchens. At the same time, this dual-purpose heat pump unit can also recover the waste heat of the high-temperature oil fume in the kitchen. Combined with combined heat and cold supply, it effectively improves the utilization efficiency of thermal energy, reduces the dependence on traditional gas energy, realizes the comprehensive utilization of heat and cold by the heat pump, and is a powerful way to practice the national energy conservation and emission reduction policy. Brief Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the steam and cold water dual-purpose heat pump unit provided in the first embodiment of the present utility model;

[0023] Figure 2 It is a schematic structural diagram of the steam and cold water dual-purpose heat pump unit provided in the second embodiment of the present utility model.

[0024] Reference Signs: 1. First evaporator; 2. Second evaporator; 3. Low-temperature compressor; 4. Condensing-evaporator; 4-1. Waste heat inlet regulating valve; 4-2. Waste heat outlet regulating valve; 5. Preheater; 6. Liquid storage tank; 7. Low-temperature expansion valve; 8. High-temperature compressor; 9. First condenser; 10. Second condenser; 11. High-temperature expansion valve; 12. Make-up water pump; 12-1. First electric regulating valve; 13. Flash tank; 13-1. Second electric regulating valve; 13-2. Circulation pump; 13-3. Third electric regulating valve; 13-4. Pressure gauge. Detailed Embodiments

[0025] The present utility model will be described in detail below with reference to the drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present utility model, and the detailed implementation manners and specific operation processes are given, but the protection scope of the present utility model is not limited to the following embodiments.

[0026] Embodiment 1:

[0027] Please refer to Figure 1, the present utility model provides a technical solution: a schematic diagram of a steam and cold water dual-purpose heat pump unit, including a low-temperature stage circulation unit, a high-temperature stage circulation unit, a steam generation unit, and several connecting pipes and valves. The low-temperature stage circulation unit includes a first evaporator 1 and a second evaporator 2 connected in parallel in sequence, a low-temperature compressor 3, a condensation-evaporator 4, a preheater 5, a liquid receiver 6, and a low-temperature expansion valve 7, and returns to the first evaporator 1 and the second evaporator 2 connected in parallel to form a closed-loop cycle. The high-temperature stage circulation unit includes a high-temperature compressor 8, a first condenser 9, a second condenser 10, a high-temperature expansion valve 11, and a condensation-evaporator 4, and returns to the high-temperature compressor 8 to form a closed-loop cycle. The steam generation unit includes a make-up water pump 12 and a first electric control valve 12-1, a flash tank 13, a second electric control valve 13-1, a circulation pump 13-2, a third electric control valve 13-3, a pressure gauge 13-4 for testing pressure on the flash tank 13, a preheater 5, a first condenser 9, and a second condenser 10.

[0028] The condensation-evaporator 4 adopts a three-channel design, including a first channel, a second channel, and a third channel. The first channel is connected to the low-temperature stage circulation unit; the second channel is connected to the high-temperature circulation unit; the third channel is connected to the inlet and outlet of kitchen fumes, and is used to recover the waste heat in the kitchen. When in use, the waste heat inlet control valve 4-1 and the waste heat outlet control valve 4-2 are directly opened, and the valves are closed when not in use.

[0029] When the kitchen has both steam and cold demand at the same time, the low-temperature and low-pressure liquid refrigerant absorbs the heat of the kitchen environment by using the first evaporator 1, and then becomes a low-temperature refrigerant steam and enters the low-temperature compressor 3. In the low-temperature compressor 3, it becomes a high-temperature and high-pressure steam and enters the condensation-evaporator 4 and the preheater 5 in sequence, and releases the heat to the high-temperature stage circulation system, and then undergoes phase change cooling to become a low-temperature and high-pressure liquid refrigerant, and flows into the liquid receiver 6. Part of the refrigerant in the liquid receiver 6 flows into the low-temperature expansion valve 7, and after throttling and pressure reduction, it returns to the first evaporator 1 again to complete the circulation process of the low-temperature stage circulation unit.

[0030] The high-temperature stage circulation refrigerant becomes a refrigerant steam after absorbing the heat from the low-temperature stage through the condensation-evaporator 4, and after being compressed by the high-temperature compressor 8, it becomes a high-temperature and high-pressure refrigerant steam and enters the first condenser 9 and the second condenser 10 in sequence. After cooling and temperature reduction, it becomes a low-temperature and high-pressure liquid refrigerant, and after throttling and pressure reduction by the high-temperature expansion valve 11, it returns to the condensation-evaporator 4 to complete the circulation process of the high-temperature stage circulation unit.

[0031] Tap water passes through the electrically operated control valve 12-1 and the makeup water pump 12 connected in series and enters the preheater 5, where the tap water is preheated using the waste heat of the low-temperature stage circulating working fluid, and then enters the second condenser 10 and the first condenser 9 to absorb the heat of the high-temperature stage. After the tap water is heated through three heat exchanges in the preheater and the two condensers, the water temperature of the tap water can rise above 120 °C, and then it enters the flash tank 13. In the flash tank 13, the steam is transported to the user end through the second electrically operated control valve 13-1, and the unused high-temperature steam or hot water is pumped back into the second condenser 10 through the third electrically operated control valve 13-3 and the circulating pump 13-2 connected in series to complete the cycle of the steam generation unit.

[0032] The pipeline system of the first evaporator 1 circulates to various parts of the kitchen, directly absorbs the low-temperature heat in the kitchen environment or the refrigerator cabinet, and cools the kitchen air conditioner and the refrigerator cabinet. When there is high-temperature waste heat such as cooking fumes in the kitchen, the waste heat inlet control valve 4-1 and the waste heat outlet control valve 4-2 of the third channel of the condensation-evaporator 4 are opened, and the kitchen waste heat is discharged into the third channel, and the high-temperature stage circulating unit is used to directly recover and utilize the kitchen waste heat in the third channel. When the heat in the kitchen and the refrigerator cabinet is insufficient, the second evaporator 2 starts to operate. The second evaporator 2 is placed outside the kitchen and can absorb the heat of the outdoor air as a supplementary heat source. When the user end stops using steam, the second electrically operated control valve 13-1 is closed, and at the same time, the makeup water pump 12 and the circulating pump 13-2 stop operating.

[0033] The cold water generated by the first evaporator 1 directly circulates to various parts of the kitchen through the pipeline system, absorbs the heat in the room or the refrigeration equipment, and the end cooling equipment is connected in parallel and can be independently controlled respectively.

[0034] Both the low-temperature compressor 3 and the high-temperature compressor 8 adopt variable-frequency scroll compressors, which can ensure the structural compactness and make the temperatures of the steam and cold water prepared by the system controllable and adjustable. The nominal horsepower is 2-30 HP to meet the use requirements of different scenarios and the comfort and personalized use requirements of the kitchen.

[0035] Both the first evaporator 1 and the second evaporator 2 adopt finned evaporators, and the fans can be adjusted in frequency. The condensation-evaporator 4, the preheater 5, the first condenser 9 and the second condenser 10 all adopt plate heat exchangers, and the specifications and models depend on the compressor horsepower.

[0036] In this embodiment, the high-temperature circulating working fluid is R245fa, and the low-temperature circulating working fluid is R134a. The heat source of the high-temperature condenser is air at 10-30 °C. The low-temperature stage can produce cold water below 15 °C, and the high-temperature stage can produce high-temperature steam or hot water above 120 °C, and the temperature of the generated heat is 90-110 °C higher than the temperature of the system heat source.

[0037] Embodiment 2:

[0038] Please refer to Figure 2 : The present utility model provides a technical solution: a schematic diagram of a steam and cold water dual-use heat pump unit, including a low-temperature stage circulation unit, a high-temperature stage circulation unit, a steam generation unit, and several connecting pipes and valves. The low-temperature stage circulation unit includes a second evaporator 2, a low-temperature compressor 3, a condensation-evaporator 4, a preheater 5, a liquid receiver 6, and a low-temperature expansion valve 7 connected in sequence, and returns to the second evaporator 2 to form a closed-loop cycle. The high-temperature stage circulation unit includes a high-temperature compressor 8, a first condenser 9, a second condenser 10, a high-temperature expansion valve 11, and a condensation-evaporator 4 connected in sequence, and returns to the high-temperature compressor 8 to form a closed-loop cycle. The steam generation unit includes a make-up water pump 12 and a first electric regulator 12-1, a flash tank 13, a second electric regulating valve 13-1, a circulation pump 13-2, a third electric regulating valve 13-3, a pressure gauge 13-4 for testing pressure on the flash tank 13, a preheater 5, a first condenser 9, and a second condenser 10.

[0039] The condensation-evaporator 4 adopts a three-channel design, including a first channel, a second channel, and a third channel. The first channel is connected to the low-temperature stage circulation unit; the second channel is connected to the high-temperature circulation unit; the third channel is connected to the inlet and outlet of kitchen fumes for recovering the waste heat in the kitchen. When in use, the waste heat inlet regulating valve 4-1 and the waste heat outlet regulating valve 4-2 are directly opened, and the valves are closed when not in use.

[0040] When the kitchen only has the demand for steam use, the low-temperature and low-pressure liquid refrigerant directly absorbs the heat of the outdoor air by using the second evaporator 2, then becomes a low-temperature refrigerant vapor and enters the low-temperature compressor 3, and then becomes a high-temperature and high-pressure vapor through the low-temperature compressor 3 and enters the condensation-evaporator 4 and the preheater 5 in sequence, and releases the heat to the high-temperature stage circulation system, and then undergoes phase change cooling to become a low-temperature and high-pressure liquid refrigerant, which flows into the liquid receiver 6. Part of the refrigerant in the liquid receiver 6 flows into the low-temperature expansion valve 7, and after throttling and pressure reduction, it returns to the second evaporator 2 again to complete the circulation process. The high-temperature stage circulation refrigerant becomes a refrigerant vapor after absorbing the heat from the low-temperature stage through the condensation-evaporator 4, and after being compressed by the high-temperature compressor 8, it becomes a high-temperature and high-pressure refrigerant vapor and enters the first condenser 9 and the second condenser 10 in sequence, and after cooling and temperature reduction, it becomes a low-temperature and high-pressure liquid refrigerant, and after throttling and pressure reduction by the high-temperature expansion valve 11, it returns to the condensation-evaporator 4 to complete the circulation process. When there is high-temperature waste heat such as kitchen fumes in the kitchen, the waste heat inlet regulating valve 4-1 and the waste heat outlet regulating valve 4-2 of the third channel of the condensation-evaporator 4 are opened, and the kitchen waste heat is discharged into the third channel, and the high-temperature stage circulation unit is directly used to recover and utilize the kitchen waste heat in the third channel. When the kitchen waste heat is sufficient, the low-temperature stage circulation unit is closed, and the kitchen waste heat is preferentially used to prepare high-temperature steam.

[0041] Tap water enters the preheater 5 through the make-up water pump 12 and the electric control valve 12-1, and is preheated by the waste heat of the low-temperature stage circulating working medium, then enters the second condenser 10 and the first condenser 9 to absorb the heat of the high-temperature stage. After being heated successively by three heat exchangers, the temperature of the tap water can rise above 120 °C and then enters the flash tank 13. In the flash tank 13, the water vapor is transported to the user end through the second electric control valve 13-1, and the unused high-temperature steam or hot water is pumped back into the second condenser 10 through the circulating pump 13-2 and the third electric control valve 13-3. When the user end stops using steam, the second electric control valve 13-1 closes, and at the same time, the make-up water pump 12 and the circulating pump 13-2 stop running. In this embodiment, the high-temperature circulating working medium is R245fa, and the low-temperature circulating working medium is R134a. The system heat source is air at 10-30 °C. The high-temperature stage can generate high-temperature steam or hot water above 120 °C, and the temperature of the generated heat is 90-110 °C higher than the temperature of the system heat source.

[0042] The steam and cold water dual-purpose heat pump unit of the present utility model realizes the comprehensive utilization of heat and cold of the heat pump in the catering industry; in the steam generation unit cycle, tap water can be directly heated from 20 °C to 120 °C at one time from the preheater to the first and second condensers, realizing large-temperature-difference heat exchange; the condensation-evaporator 4, which is the heat exchange between the low-temperature stage circulation unit and the high-temperature stage circulation unit, adopts a three-channel design to realize full heat recovery of the heat source.

[0043] The above embodiments only represent the specific implementation manners of the present utility model, and the description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. A heat pump unit that can be used with both steam and cold water, characterized in that, It includes a low-temperature stage circulation unit, a high-temperature stage circulation unit, and a steam generation unit; The low-temperature stage circulation unit includes an evaporator, a low-temperature compressor (3), a condensation-evaporator (4), a preheater (5), a liquid receiver (6), and a low-temperature expansion valve (7) connected in sequence, and returns to the evaporator to form a closed-loop cycle; The high-temperature stage circulation unit includes a high-temperature compressor (8), a first condenser (9), a second condenser (10), a high-temperature expansion valve (11), and a condensation-evaporator (4) connected in sequence, and returns to the high-temperature compressor (8) to form a closed-loop cycle; The steam generation unit includes a make-up water pump (12) and a first electric control valve (12-1), a flash tank (13), a second electric control valve (13-1), a circulation pump (13-2), a third electric control valve (13-3), a pressure gauge (13-4) for testing pressure on the flash tank (13), a preheater (5), a first condenser (9), and a second condenser (10); The low-temperature and low-pressure liquid refrigerant in the evaporator absorbs the heat of the kitchen environment and becomes low-temperature refrigerant vapor, which enters the low-temperature compressor (3). In the low-temperature compressor (3), it becomes high-temperature and high-pressure vapor and enters the condensation-evaporator (4) and the preheater (5) in sequence, and releases the heat to the high-temperature stage circulation system. Then, it undergoes phase change cooling to become low-temperature and high-pressure liquid refrigerant, which flows into the liquid receiver (6). Part of the refrigerant in the liquid receiver (6) flows into the low-temperature expansion valve (7), and after throttling and pressure reduction, it returns to the evaporator again to complete the circulation process of the low-temperature stage circulation unit; The high-temperature stage circulation refrigerant absorbs the heat from the low-temperature stage through the condensation-evaporator (4) and becomes refrigerant vapor. After being compressed by the high-temperature compressor (8), it becomes high-temperature and high-pressure refrigerant vapor and enters the first condenser (9) and the second condenser (10) in sequence. After cooling and temperature reduction, it becomes low-temperature and high-pressure liquid refrigerant, and returns to the condensation-evaporator (4) after throttling and pressure reduction by the high-temperature expansion valve (11) to complete the circulation process of the high-temperature stage circulation unit; Tap water enters the preheater (5) through the serially connected electric control valve (12-1) and the make-up water pump (12). In the preheater (5), the tap water is preheated using the waste heat of the low-temperature stage circulation refrigerant, and then enters the second condenser (10) and the first condenser (9), where it absorbs the heat of the high-temperature stage. After absorbing heat, the water enters the flash tank (13). In the flash tank (13), the vapor is delivered to the user end through the second electric control valve (13-1), and the unutilized high-temperature steam or hot water is pumped back into the second condenser (10) through the serially connected third electric control valve (13-3) and the circulation pump (13-2) to complete the circulation of the steam generation unit.

2. The steam and cold water dual-purpose heat pump unit according to claim 1, characterized in that, The condensation-evaporator (4) adopts a three-channel design. The first channel is connected to the low-temperature stage circulation unit; the second channel is connected to the high-temperature circulation unit; the third channel is connected to the inlet and outlet of kitchen fume through a waste heat inlet control valve (4-1) and a waste heat outlet control valve (4-2) to recover the waste heat in the kitchen.

3. The steam and cold water dual-use heat pump unit according to claim 1, characterized in that, The preheater (5) is a plate heat exchanger. One side of the fluid is the low-temperature stage circulating working medium, and the other side of the fluid is the tap water transported by the make-up water pump. The preheater uses the waste heat of the low-temperature stage circulating working medium to preheat the tap water. After the tap water is heated by the preheater (5) and then passes through the first condenser (9) and the second condenser (10), the tap water at 20°C is heated to 120°C at one time.

4. The steam and cold water dual-purpose heat pump unit according to claim 1, characterized in that, The pipeline system of the evaporator circulates to various parts of the kitchen, directly absorbs the low-temperature heat in the kitchen environment or the refrigerator cabinet, and supplies cold to the cold-using equipment in the kitchen.

5. The steam and cold water dual-purpose heat pump unit according to claim 4, wherein It also includes an outdoor evaporator, which is connected in parallel with the evaporator, absorbs the heat of the outdoor air, and is used as a supplementary heat source.

6. The steam and cold water dual-purpose heat pump unit according to claim 5, wherein, Both the evaporator and the outdoor evaporator adopt finned evaporators, and the fans are frequency-converted and adjusted.

7. The steam and cold water dual-use heat pump unit according to claim 1, characterized in that, The condensation-evaporator (4), the preheater (5), the first condenser (9) and the second condenser (10) are all heat exchangers.

8. The steam and cold water dual-purpose heat pump unit according to claim 1, characterized in that, The working medium in the high-temperature stage circulation unit is R245fa, and the working medium in the low-temperature stage circulation unit is R134a.

9. The steam and cold water dual-use heat pump unit according to claim 8, characterized in that, The low-temperature compressor (3) and the high-temperature compressor (8) both adopt variable-frequency scroll compressors, and the steam temperature produced is controllable and adjustable.

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