A refrigeration and heating system for co-producing clean water at two temperatures and domestic hot water

Abstract

The present invention discloses a dual-temperature clean water and domestic hot water co-production system and its preparation method, including a first compression cycle unit, a second compression cycle unit and a closed tank. A distilled water collection tank and a third condenser are arranged in the closed tank. The top of the distilled water collection tank is open and above the liquid level in the closed tank. The third condenser is below the liquid level in the closed tank. A first evaporator is arranged inside or above the distilled water collection tank. The present invention utilizes the dual-temperature condensation temperature to match the refrigerant cascade compression process, realizes the cascade utilization of energy, and solves the two major problems of too low compressor volumetric efficiency and too high exhaust temperature of traditional heat pump distilled water machines under high pressure ratio conditions.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat pumps, and particularly relates to a dual-temperature clean water and domestic hot water co-production system and a preparation method thereof. Background Art

[0002] Distillation devices are involved in various fields such as petroleum, chemical industry, medicine, food, seawater desalination, scientific research, and daily life, and the demand is gradually increasing. A heat pump distiller uses heat pump technology to provide heat to heat tap water to boiling under a very high vacuum negative pressure condition to generate water vapor, and then uses the refrigeration effect of the refrigerant to condense the water vapor to produce distilled water. It mainly consists of an ejector, a closed tank, a compressor, a condenser, a throttling component, and an evaporator. The low-temperature and low-pressure refrigerant wet steam exchanges heat with the external environment in the air-cooled evaporator, absorbs heat and evaporates into low-temperature and low-pressure saturated refrigerant steam, and then enters the compressor to be adiabatically compressed into high-temperature and high-pressure superheated steam. The superheated steam heats water to boiling in the condenser of the closed tank, generates water vapor and then is transformed into high-pressure liquid saturated refrigerant. After throttling and pressure reduction through the throttling component, it enters the evaporator of the closed tank to condense the water vapor, and finally returns to the compressor to achieve the purpose of producing distilled water. The high-temperature hot water of traditional heat pump distillers is usually obtained by electric heating, which significantly increases the consumption of high-grade electric energy.

[0003] The prior art discloses a device for producing boiling water by a high-temperature heat pump, which includes a compressor, a condenser, a gas-liquid separator, an evaporator, a regenerator, etc. It produces high-temperature hot water and medium-low temperature hot water through a heat pump system, but it needs to additionally set up a distilled water production device, and it fails to realize the organic integration of the distilled water system and the heat pump system. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems existing in the prior art, and provide a dual-temperature clean water and domestic hot water co-production system and a preparation method thereof, which use a first compressor and a second compressor to form a multistage compression cycle to work in a coupled manner to produce low-temperature distilled water at 5 - 20°C, high-temperature distilled water at 80 - 100°C, and domestic hot water at 40°C - 60°C.

[0005] One of the purposes of the present invention is to provide a dual-temperature clean water and domestic hot water co-production system, including a first compression cycle unit, a second compression cycle unit, and a closed tank. A distilled water collection tank and a third condenser are arranged in the closed tank. The top of the distilled water collection tank is open and located above the liquid level in the closed tank. The third condenser is located below the liquid level in the closed tank. A first evaporator is arranged inside or above the distilled water collection tank.

[0006] The first compression cycle unit includes a first compressor which has a low-pressure suction port, a medium-pressure discharge port and a high-pressure discharge port. The high-pressure discharge port of the first compressor is connected to the inlet of a first evaporator through a first compression cycle pipeline, and the outlet of the first evaporator is connected to the low-pressure suction port of the first compressor;

[0007] The second compression cycle unit includes a second compressor which has a low-pressure suction port and a medium-pressure discharge port. The medium-pressure discharge ports of the first compressor and the second compressor are jointly connected to the refrigerant inlet of a third condenser, and the refrigerant outlet of the third condenser is connected to the low-pressure suction port of the second compressor through a second compression cycle pipeline.

[0008] As a preferred solution, the distilled water collection tank further includes a water outlet. The outlet of the distilled water collection tank is divided into a first branch and a second branch. The first branch is connected to a high-temperature storage tank after heat exchange with the first compression cycle pipeline. The high-temperature storage tank is used to hold distilled water at a first temperature value. The second branch is connected to a low-temperature storage tank after heat exchange with the second compression cycle pipeline. The low-temperature storage tank is used to hold distilled water at a second temperature value. The first temperature value is greater than the second temperature value.

[0009] As a preferred solution, the outlet of the second evaporator is divided into two branches. One branch is connected to the low-pressure suction port of the first compressor through a ninth control valve, and the other branch is connected to the low-pressure suction port of the second compressor through an eighth control valve.

[0010] As a preferred solution, a condenser assembly is provided on the first compression cycle pipeline. The condenser assembly includes at least one group of condensers. The condenser assembly includes a refrigerant channel and a distilled water channel. The refrigerant channel inlet of the condenser assembly is connected to the high-pressure discharge port of the first compressor, and its refrigerant channel outlet is connected to the refrigerant channel inlet of the first evaporator through a first throttling component. The distilled water channel inlet of the condenser assembly is connected to the bottom water outlet of the distilled water collection tank, and the distilled water channel outlet of the condenser assembly is connected to the high-temperature storage tank.

[0011] As a preferred solution, a second evaporator is provided on the second compression cycle pipeline. The second evaporator includes a refrigerant channel and a distilled water channel. The refrigerant channel inlet of the second evaporator is connected to one end of the outlet of the third condenser, and the refrigerant channel outlet of the second evaporator is connected to the low-pressure suction port of the second compressor. The distilled water channel inlet of the second evaporator is connected to the bottom outlet of the distilled water collection tank, and its distilled water channel outlet is connected to the low-temperature storage tank.

[0012] As a preferred solution, it further includes a first regenerator. The refrigerant channel inlet of the first regenerator is connected to the refrigerant outlet of the third condenser. The refrigerant channel outlet of the first regenerator is divided into two branches. One branch is connected to the refrigerant inlet of the first evaporator through a second throttling component, and the other branch is connected to the refrigerant channel inlet of the second evaporator through a third throttling component.

[0013] As a preferred solution, it further includes an automatic air extraction unit. The automatic air extraction unit is connected to the space above the liquid level of the sealed tank and is used to extract the non-condensable gas in the sealed tank to form a negative pressure environment in the internal space above the liquid level of the sealed tank.

[0014] As a preferred solution, it further includes a steam-water heat exchanger. The steam-water heat exchanger is located inside or above the distilled water collection tank and is used to exchange heat and condense the water vapor in the sealed tank and collect it into the distilled water collection tank. The domestic water in the steam-water heat exchanger channel is heated to a third temperature value, and the third temperature value is less than the first temperature value and greater than the second temperature value.

[0015] As a preferred solution, the medium-pressure exhaust port of the first compressor is connected to the inlet pipeline of the third condenser through a check valve I, and the medium-pressure exhaust port of the second compressor is connected to the inlet pipeline of the third condenser through a check valve II.

[0016] The second object of the present invention is to provide a method for co-producing dual-temperature clean water and domestic hot water, and the specific steps are as follows:

[0017] When operating in the co-production mode of low-temperature distilled water and domestic hot water, the compression cycle unit composed of the first compressor, the second compressor, the third condenser, the second throttling component, the third throttling component, the first evaporator, the second evaporator, the first regenerator, the second regenerator, the check valve I and the check valve II produces low-temperature distilled water and domestic hot water;

[0018] When operating in the co-production mode of high-temperature distilled water and domestic hot water, the compression cycle unit composed of the first compressor, the second compressor, the first condenser, the second condenser, the third condenser, the first throttling component, the second throttling component, the first evaporator, the first regenerator, the check valve I, the check valve II, the eighth control valve and the ninth control valve produces high-temperature distilled water and domestic hot water;

[0019] When operating in the co-production mode of dual-temperature distilled water and domestic hot water, the compression cycle unit composed of the first compressor, the second compressor, the first condenser, the second condenser, the third condenser, the first throttling component, the second throttling component, the third throttling component, the first evaporator, the second evaporator, the first regenerator, the second regenerator, the check valve I, the check valve II, the eighth control valve and the ninth control valve produces high-temperature distilled water, low-temperature distilled water and domestic hot water;

[0020] The temperature of the domestic hot water is between that of the low-temperature distilled water and the high-temperature distilled water.

[0021] Beneficial effects

[0022] First, this solution uses a cascaded compression cycle composed of a first compressor and a second compressor to achieve the cascaded production of thermal energy of distilled water (or domestic hot water). According to the different temperatures of the produced distilled water and domestic hot water, a refrigerant cascaded compression process is matched with a two-temperature condensing temperature, realizing the cascaded utilization of energy and solving the two major problems of too low compressor volumetric efficiency and too high exhaust temperature of traditional heat pump distilled water machines under high pressure ratio conditions.

[0023] Second, in this invention, the preparation processes of distilled water and domestic water are optimized. According to the heat requirements of different user terminals, this refrigeration and heating system for co-producing dual-temperature clean water and domestic hot water can provide low-temperature distilled water, high-temperature distilled water alone, or both low-temperature distilled water and high-temperature distilled water simultaneously, and domestic hot water within the temperature range between high-temperature distilled water and low-temperature distilled water can be obtained in each mode. Description of the drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a structural diagram of the heat pump co-production system for dual-temperature clean water and domestic water of the present invention;

[0026] Markings in the figure: Markings in the figure: 1. First compressor, 2. First condenser, 3. Second condenser, 4. First evaporator, 5. Steam-water heat exchanger, 6. Second compressor, 7. Third condenser, 8. First regenerator, 9. Second evaporator, 10. High-temperature distilled water storage tank, 11. Second regenerator, 12. Low-temperature distilled water storage tank, 13. Ejector, 14. Non-condensable gas separator, 15. Pressure sensor, 16. Gas collecting tank, 17. Exhaust tank, 18. Sealed tank, 19. Distilled water collection tank, 20. Second water pump, 21. First water pump, 22. Distilled water pressurizing pump, 101. First control valve, 102. Second control valve, 103. Third control valve, 104. Fourth control valve, 105. Fifth control valve, 106. Sixth control valve, 107. Seventh control valve, 108. Eighth control valve, 109. Ninth control valve, 201. First throttling component, 202. Second throttling component, 203. Third throttling component, 301. Check valve Ⅰ, 302. Check valve Ⅱ. Detailed implementation manners

[0027] The present invention will be specifically described below by way of exemplary embodiments. However, it should be understood that, without further elaboration, elements, structures, and features in one embodiment may also be beneficially incorporated into other embodiments.

[0028] It should be noted that: Unless otherwise defined, the technical terms or scientific terms used herein should have the ordinary meanings understood by those of ordinary skill in the art to which the present invention pertains. The words such as "a", "an", or "the" used in the specification and claims of the present invention for patent applications do not express a limitation of quantity, but rather indicate the presence of at least one. Words such as "comprising" or "including" point out that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, but do not exclude other elements or items having the same functions.

[0029] As shown in the figure: The present invention provides a refrigeration and heating system for co-producing dual-temperature clean water and domestic hot water, which includes three major parts: a compression cycle unit, a distilled water production unit, and an automatic air extraction unit. The compression cycle unit includes a first compression cycle unit and a second compression cycle unit. The first compression cycle unit exchanges heat with the medium-temperature distilled water from the distilled water production unit, thereby realizing the heat transfer process between the first condenser 2, the second condenser 3, and the medium-temperature distilled water, and obtaining high-temperature distilled water at 80 - 100 °C (the first temperature value). The second compression cycle unit exchanges heat with the medium-temperature distilled water from the distilled water production unit, thereby realizing the heat transfer process between the second regenerator 11, the second evaporator 9, and the medium-temperature distilled water, and obtaining low-temperature distilled water at 5 - 20 °C (the second temperature value). The compression cycle unit realizes cascade utilization of energy through cascade compression, and can effectively solve the problem of relatively high energy consumption in producing high-temperature distilled water and low-temperature distilled water by traditional heat pump distilled water machines.

[0030] The following analyzes the distilled water production unit: The distilled water production unit includes a closed tank 18, a distilled water collection tank 19, a sixth control valve 106, a seventh control valve 107, a high-temperature distilled water storage tank 10, a low-temperature distilled water storage tank 12, a first control valve 101, a first water pump 21, a first regenerator 8, and a second regenerator 11. A distilled water collection tank 19 and a third condenser 7 are arranged in the closed tank 18.

[0031] In this solution, the tap water in the sealed tank 18 submerges the third condenser 7, and the third condenser 7 is located below the tap water level. The first evaporator 4 and the steam-water separator 5 are arranged inside or above the distilled water collection tank 19. Both the first evaporator 4 and the steam-water separator 5 are located above the liquid level in the distilled water collection tank 19. The distilled water collection tank 19 is located in the upper space of the sealed tank 18, and the top of the distilled water collection tank 19 is open. The tap water at the bottom of the sealed tank 18 absorbs the condensation heat of the refrigerant in the third condenser 7 and evaporates into water vapor. The generated water vapor enters the upper part of the sealed tank 18. Under the combined action of the first evaporator 4 and the steam-water separator 5, it absorbs the condensation heat of the water vapor, so that the water vapor is condensed into medium-temperature distilled water. The condensed medium-temperature distilled water is collected in the distilled water collection tank 19. Subsequently, the medium-temperature distilled water flows out from the bottom outlet of the distilled water collection tank 19 and is divided into two branches. Under the action of the distilled water pressure pump 22: one part flows through the second condenser 3 and the first condenser 2 after being heated by controlling the sixth control valve 106 and then flows to the high-temperature distilled water storage tank 10 to obtain high-temperature distilled water at 80-100 °C; the other part flows through the second regenerator 11 and the second evaporator 9 after being cooled by controlling the seventh control valve 107 and then flows to the low-temperature distilled water storage tank 12 to obtain low-temperature distilled water at 5-20 °C.

[0032] In this solution, the medium-temperature distilled water at 40-60 °C flows out from the bottom of the distilled water collection tank 19 and is divided into two branches. One branch is used as the water supply channel for the high-temperature distilled water storage tank 10, and the other branch is used as the water supply channel for the low-temperature distilled water storage tank 12. The corresponding sixth control valve 106 and seventh control valve 107 can be adjusted according to the user's demand for the water volume of high-temperature distilled water, medium-temperature distilled water, and low-temperature distilled water, so as to change the water volume of the medium-temperature distilled water flowing into different branches.

[0033] In this solution, the preheated tap water enters the sealed tank 18 and generates water vapor under the action of the third condenser 7. The steam-water heat exchanger 5 in the upper part of the sealed tank 18 absorbs the condensation heat of the generated water vapor, and heating (or domestic) hot water at 40 °C - 60 °C (the third temperature value) can be obtained.

[0034] In this embodiment, the insulation layers of the sealed tank 18, the high-temperature distilled water storage tank 10, and the low-temperature distilled water storage tank 12 are all composed of one or more insulation materials. The insulation materials include polyurethane foam, polystyrene board, phenolic foam, aerogel felt, and glass wool, which can avoid heat transfer with the environment.

[0035] In this solution, the automatic air extraction unit includes a second water pump 20, a second control valve 102, an ejector 13, a non-condensable gas separator 14, a pressure sensor 15, a gas collection tank 16, a fourth control valve 104, a fifth control valve 105, and an exhaust tank 17.

[0036] The ejector 13 is a device that utilizes the Venturi tube effect to obtain low pressure. It consists of a nozzle, a mixing chamber, and a diffuser chamber. The ejecting liquid is ejected from the nozzle at high speed after being pressurized by the second water pump 20. After mixing with the entrained gas in the mixing chamber, it flows out after being pressurized by the diffuser chamber. A low-pressure environment is created through the automatic air extraction unit to discharge non-condensable gases such as air in the closed tank 18. The ejector 13 has an entrained gas inlet, a working fluid inlet, and a discharge outlet. The entrained gas inlet of the ejector 13 is connected to the space above the liquid level of the closed tank 18 through a pipeline. The working fluid inlet of the ejector 13 is connected to the space below the liquid level of the closed tank 18. The ejecting fluid is tap water located at the bottom of the closed tank 18. The ejecting fluid enters the nozzle of the ejector 13 after being pressurized by the second water pump 20, and the entrained gas is led into the ejector 13 from the bottommost part above the tap water liquid level of the closed tank 18.

[0037] The non-condensable gas separator 14 is connected to the discharge outlet of the ejector 13. The bottom liquid outlet of the non-condensable gas separator 14 is connected to the interior of the closed tank 18 through the fourth control valve 104. The top gas outlet of the non-condensable gas separator 14 is connected to the gas collection tank 16. The gas collection tank 16 is connected to the exhaust tank 17 through the fifth control valve 105. The flow from the outlet of the ejector 13 to the non-condensable gas separator 14 undergoes gas-liquid separation. The tap water returns to the closed tank 18 through the fourth control valve 104, and the non-condensable gas enters the gas collection tank 16. The pressure sensor 15 at its upper part is used to detect the pressure of the non-condensable gas. When the pressure exceeds the set value, an automatic exhaust operation is performed. Also, when exhausting, the third control valve 103 and the fourth control valve 104 are first closed, so that the gas in the gas collection tank 16 is compressed and the pressure increases, thereby exhausting through the fifth control valve 105. In addition, the automatic air extraction unit can detect the pressure of the gas collection tank 16 in real time by setting the pressure sensor 15, and judge the airtight performance of the closed tank 18 according to the change of the pressure.

[0038] In this embodiment, the working principle of water vapor generation is based on the positive correlation between the evaporation temperature and the saturation pressure of saturated water. By using the automatic air extraction unit to make the closed tank 18 under a very high vacuum negative pressure condition, the tap water undergoes an evaporation process at a lower temperature to generate water vapor. The tap water passes through the first water pump 21 and flows successively into the water channels of the second regenerator 11 and the first regenerator 8 to achieve preheating of the tap water. The preheated tap water flows out from the outlet of the water channel of the first regenerator 8 to the bottom of the closed tank 18, so that the tap water located at the bottom of the closed tank 18 absorbs the condensation heat of the refrigerant in the third condenser 7 and evaporates into water vapor.

[0039] The following is an analysis of the compression cycle unit: The compression cycle unit includes a first compression cycle unit and a second compression cycle unit. The first compression cycle unit includes a first compressor 1, a first condenser 2, a second condenser 3, a first throttling component 201, a first evaporator 4, a steam-water heat exchanger 5, and a ninth control valve 109; the first compressor 1 has a low-pressure suction port, a medium-pressure discharge port, and a high-pressure discharge port. The high-pressure discharge port of the first compressor 1 is connected to the inlet of the first evaporator 4 through a first compression cycle pipeline. The outlet of the second evaporator 4 is divided into two branches. One branch is connected to the refrigerant inlet of the first compressor 1 through the ninth control valve 109, and the other branch is connected to the refrigerant inlet of the second compressor 6 through an eighth control valve 108. The first compression cycle pipeline is provided with a first condenser 2 and a second condenser 3. The refrigerant channel inlet of the first condenser 2 is connected to the high-pressure discharge port of the first compressor 1. The refrigerant channel outlet of the first condenser 2 is connected to the refrigerant channel inlet of the second condenser 3. The refrigerant channel outlet of the second condenser 3 is connected to the inlet of the first evaporator 4 through the first throttling component 201. The outlet of the first evaporator 4 is connected to the refrigerant inlet of the first compressor 1 through the ninth control valve 109. The distilled water channel of the second condenser 3 is connected to the distilled water pressurizing pump 22 at the outlet of the distilled water collection tank 19 through a sixth control valve 106. The outlet of the distilled water channel of the second condenser 3 is connected to the inlet of the distilled water channel of the first condenser 2. The outlet of the distilled water channel of the first condenser 2 is connected to the high-temperature distilled water storage tank 10.

[0040] The second compression cycle unit includes a second compressor 6, a third condenser 7, a second throttling component 202, a first regenerator 8, a third throttling component 203, a second evaporator 9, a check valve Ⅰ 301, a check valve Ⅱ 302, and an eighth control valve 108. This compression cycle unit can operate in different modes, including the co-production mode of low-temperature distilled water and domestic hot water, the co-production mode of high-temperature distilled water and domestic hot water, and the co-production mode of dual-temperature (high and low temperature) distilled water and domestic hot water.

[0041] The second compression cycle pipeline is provided with a second evaporator 9. The second evaporator 9 includes a refrigerant channel and a distilled water channel. The refrigerant channel inlet of the second evaporator 9 is connected to the refrigerant channel outlet of the first regenerator 8 through the third throttling component 203. Its refrigerant channel outlet is connected to the low-pressure suction port of the second compressor 6. The distilled water channel inlet of the second evaporator 9 is connected to the distilled water pressurizing pump 22 at the bottom outlet pipeline of the distilled water collection tank 19 through a seventh control valve 107. The outlet of the distilled water channel of the second evaporator 9 is connected to the low-temperature storage tank 12.

[0042] In this solution, a first regenerator 8 and a second regenerator 11 are also provided. The outlet of the tap water channel of the first regenerator 8 is connected to the water inlet of the sealed tank 18, and the inlet of the tap water channel of the first regenerator 8 is connected to the outlet of the tap water channel of the second regenerator 11. The inlet of the tap water channel of the second regenerator 11 is externally connected to tap water at about 20°C. The second regenerator 11 further includes a distilled water channel. The inlet of the distilled water channel of the second regenerator 11 is connected to the distilled water pressurizing pump 22 at the outlet of the distilled water collection tank 19 through a seventh control valve 107. The outlet of the distilled water channel of the second regenerator 11 is connected to the inlet of the distilled water channel of the second evaporator 9. The inlet of the refrigerant channel of the first regenerator 8 is connected to the refrigerant outlet of the third condenser 7. The outlet of the refrigerant channel of the first regenerator 8 is divided into two branches. One branch is connected to the pipeline between the first evaporator 4 and the first throttling member 201 through a second throttling member 202, and the other branch is connected to the inlet of the refrigerant channel of the second evaporator 9 through a third throttling member 203.

[0043] In this embodiment, the medium-pressure exhaust port of the first compressor 1 is connected to the refrigerant inlet of the third condenser 7 through a check valve I 301, and the medium-pressure exhaust port of the second compressor 6 is connected to the refrigerant inlet of the third condenser 7 through a check valve II 302. In this embodiment, the flow rate of the medium-pressure refrigerant flowing from the compression cycle of the first compressor to the third condenser 7 is controlled by adjusting the check valve I 301, and the flow rate of the medium-pressure refrigerant flowing from the compression cycle of the second compressor to the third condenser 7 is controlled by adjusting the check valve II 302. The evaporation amount of the tap water in the sealed tank 18 is controlled by adjusting the check valve I 301 and the check valve II 302.

[0044] In this solution, heat exchangers such as the first condenser 2, the second condenser 3, and the second evaporator 9 are any one of a plate heat exchanger, a shell-and-tube heat exchanger, or a tube-in-tube heat exchanger. The first evaporator 4, the steam-water heat exchanger 5, and the third condenser 7 adopt spiral heat exchange coils. The first throttling member 201, the second throttling member 202, and the third throttling member 203 are any one or two of a thermal expansion valve, a capillary valve, or an electronic expansion valve.

[0045] In this embodiment, the evaporation temperature of the refrigerant in the first evaporator 4 in the compression cycle of the first compressor is lower than the saturation temperature of the water vapor in the upper part of the sealed tank 19, and at the same time, it is higher than the evaporation temperature of the refrigerant in the second evaporator 9 in the compression cycle of the second compressor.

[0046] In this embodiment, the working medium of the dual-temperature clean water heat pump system is a refrigerant composed of one or two mixtures of R245fa, R152a, R236fa, R600a, R600, R236ea, or R245ca; the working medium of the distilled water production system is water.

[0047] This embodiment also provides a method for co-producing dual-temperature clean water and domestic hot water. When working in the co-production mode of low-temperature distilled water and domestic hot water, a compression circulation unit composed of a first compressor 1, a second compressor 6, a third condenser 7, a second throttling component 202, a third throttling component 203, a first evaporator 4, a second evaporator 9, a first heat regenerator 8, a second heat regenerator 11, a one-way valve I 301, and a one-way valve II 302 produces 5-20°C low-temperature distilled water and 40°C-60°C domestic hot water; low-temperature distilled water and domestic hot water Water cogeneration method: The medium-pressure superheated refrigerant vapor compressed by the first compressor 1 is discharged from the medium-pressure exhaust port of the first compressor 1, and then merges with the medium-pressure superheated refrigerant vapor compressed and discharged by the second compressor 6, and flows into the third condenser 7 to release heat to heat the tap water to vaporize in the range of 7-30kPa to produce saturated water vapor. The medium-pressure saturated liquid refrigerant flowing out of the third condenser 7 enters the first regenerator 8, and after heating the tap water, it becomes a supercooled liquid refrigerant and is divided into two branches: the refrigerant in one branch passes through the third throttling component 2 03 is throttled and depressurized into a low-pressure gas-liquid two-phase refrigerant, enters the second evaporator 9 to absorb the heat of distilled water to produce 5-20℃ low-temperature distilled water and evaporates into a low-pressure gaseous refrigerant, and then is sucked into the second compressor 6 to be compressed into a medium-pressure superheated refrigerant, and the process of using the second compressor 6 to compress and cycle to produce 5-20℃ low-temperature distilled water is completed. The refrigerant in the other branch is throttled and depressurized to a higher evaporation pressure gas-liquid two-phase refrigerant through the second throttling component 202, enters the first evaporator 4 to absorb the heat of the water vapor in the closed tank, and the water vapor is condensed into steam. Distilled water, and then the refrigerant vapor flowing out of the first evaporator 4 is sucked into the first compressor 1 and compressed into medium-pressure superheated refrigerant. The distilled water in the distilled water collection tank 19 is sent to the second regenerator 11 through the distilled water booster pump 22 to preheat the tap water, and then flows into the second evaporator 9 to be cooled to 5-20℃ low-temperature distilled water and stored in the low-temperature distilled water storage tank. A part of the water vapor in the closed tank 18 is used to heat cold water through the steam-water heat exchanger 5 to produce 40℃-60℃ domestic hot water. At this point, the second compressor compression cycle is completed.

[0048] When operating in the mode of co-producing high-temperature distilled water and domestic hot water, the compression cycle unit composed of the first compressor 1, the second compressor 6, the first condenser 2, the second condenser 3, the third condenser 7, the first throttling component 201, the second throttling component 202, the first evaporator 4, the first regenerator 8, check valve I 301, check valve II 302, the eighth control valve 108, and the ninth control valve 109 produces high-temperature distilled water at 80 - 100 °C and domestic hot water at 40 °C - 60 °C; Method for co-producing high-temperature distilled water and domestic hot water: The high-pressure superheated refrigerant vapor compressed by the first compressor 1 is discharged from the high-pressure exhaust port of the first compressor 1 and then flows successively into the refrigerant channels of the first condenser 2 and the second condenser 3, where it releases heat to the distilled water to produce high-temperature distilled water at 80 - 100 °C and condenses into high-pressure gaseous refrigerant. Then, it passes through the first throttling component 201 to throttle down to a high evaporation pressure gas-liquid two-phase refrigerant; The medium-pressure superheated refrigerant vapor compressed by the first compressor 1 is discharged from the medium-pressure exhaust port of the first compressor 1, converges with the medium-pressure superheated refrigerant vapor compressed and discharged by the second compressor 6, and flows into the third condenser 7 to release heat to heat tap water, vaporizing it within the range of 7 - 30 kPa to produce saturated water vapor. The medium-pressure saturated liquid refrigerant flowing out of the third condenser 7 enters the first regenerator 8 to heat tap water and then becomes subcooled liquid refrigerant, which passes through the second throttling component 202 to throttle down to a high evaporation pressure gas-liquid two-phase refrigerant; The gas-liquid two-phase refrigerant passing through the first throttling component 201 converges with the gas-liquid two-phase refrigerant passing through the second throttling component 202, enters the first evaporator 4 to absorb the heat of the water vapor in the closed tank 8, and the water vapor is condensed into distilled water. Then, the refrigerant vapor flowing out of the first evaporator 4 is divided into two branches: one branch is sucked into the first compressor 1 and compressed into medium-pressure superheated refrigerant and high-pressure superheated refrigerant, and the other branch is sucked into the second compressor 6 and compressed into medium-pressure superheated refrigerant. The distilled water in the distilled water collection tank 19 is sent to the second condenser 3 and the first condenser 2 by the distilled water pressure pump 22, heated to high-temperature distilled water at 80 - 100 °C, and stored in the high-temperature distilled water storage tank 10. A part of the water vapor in the closed tank 18 is used to heat cold water through the steam-water heat exchanger 5 to produce domestic hot water at 40 °C - 60 °C. Thus, the compression cycle process of the first compressor 1 is completed.

[0049] When operating in the co-production mode of dual-temperature (high and low temperature) distilled water and domestic hot water, the compression cycle unit composed of the first compressor 1, the second compressor 6, the first condenser 2, the second condenser 3, the third condenser 7, the first throttling component 201, the second throttling component 202, the third throttling component 203, the first evaporator 4, the second evaporator 11, the first regenerator 8, the second regenerator 11, check valve I 301, check valve II 302, the eighth control valve 108, and the ninth control valve 109 produces low-temperature distilled water at 5-20°C, high-temperature distilled water at 80-100°C, and heating (or domestic) hot water at 40°C - 60°C; The co-production method of dual-temperature (high and low temperature) distilled water and domestic hot water: The refrigerant vapor compressed by the first compressor 1 is discharged from the high-pressure exhaust port of the first compressor 1 and then flows successively into the first condenser 2 and the second condenser 3, where it releases heat to the distilled water to produce high-temperature distilled water at 80-100°C and condenses into high-pressure gaseous refrigerant. Then, it passes through the first throttling component 201 to throttle down to a higher evaporation pressure, becoming a gas-liquid two-phase refrigerant; The refrigerant vapor compressed by the first compressor 1 to medium-pressure superheated state is discharged from the medium-pressure exhaust port of the first compressor 1, converges with the medium-pressure superheated refrigerant vapor compressed and discharged by the second compressor 6, and flows into the third condenser 7 to release heat to heat tap water, vaporizing it within the range of 7-30 kPa to produce saturated water vapor. The medium-pressure saturated liquid refrigerant flowing out of the third condenser 7 enters the first regenerator 8 to heat tap water and then becomes subcooled liquid refrigerant, which is divided into two branches: One branch of the refrigerant passes through the third throttling component 203 to be throttled down to a low-pressure gas-liquid two-phase refrigerant, enters the refrigerant channel of the second evaporator 9 to absorb heat from the distilled water to produce low-temperature distilled water at 5-20°C and evaporates into low-pressure gaseous refrigerant, and then is sucked into the second compressor 6 to be compressed into medium-pressure superheated refrigerant, thus completing the process of producing low-temperature distilled water at 5-20°C using the compression cycle of the second compressor 6. The other branch of the refrigerant passes through the second throttling component 202 to throttle down to a higher evaporation pressure, becoming a gas-liquid two-phase refrigerant, converges with the gas-liquid two-phase refrigerant throttled down to a higher evaporation pressure by the first throttling component 201, and enters the first evaporator 4 to absorb heat from the water vapor in the closed tank 18, and the water vapor is condensed into distilled water. Then, the refrigerant vapor flowing out of the first evaporator 4 is sucked into the first compressor 1 to be compressed into medium-pressure superheated refrigerant and high-pressure superheated steam, thus completing the process of producing high-temperature distilled water at 80-100°C using the compression cycle of the first compressor 1;The distilled water in the distilled water collection tank 19 is divided into two branches by the distilled water pressurizing pump 22: one branch is sent to the second regenerator 11 to preheat the tap water, and then flows into the second evaporator 9 to be cooled to 5-20°C low-temperature distilled water and stored in the low-temperature distilled water storage tank 12. The other branch is sent to the second condenser 3 and the first condenser 2 to be heated to 80-100°C high-temperature distilled water and stored in the high-temperature distilled water storage tank 10. A part of the water vapor in the closed tank 18 is used to heat cold water through the steam-water heat exchanger 5 to produce domestic hot water at 40°C - 60°C. Thus, the compression cycle processes of the first compressor 1 and the second compressor 6 are completed.;

[0050] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A dual-temperature clean water and domestic hot water co-production system, characterized in that: It includes a first compression cycle unit, a second compression cycle unit and a sealed tank. A distilled water collection tank and a third condenser are arranged in the sealed tank. The top of the distilled water collection tank is open and above the liquid level in the sealed tank. The third condenser is below the liquid level in the sealed tank. A first evaporator is arranged inside or above the distilled water collection tank; The first compression cycle unit includes a first compressor. The first compressor has a low-pressure suction port, a medium-pressure discharge port and a high-pressure discharge port. The high-pressure discharge port of the first compressor is connected to the inlet of the first evaporator through a first compression cycle pipeline, and the outlet of the first evaporator is connected to the low-pressure suction port of the first compressor; The second compression cycle unit includes a second compressor. The second compressor has a low-pressure suction port and a medium-pressure discharge port. The medium-pressure discharge port of the first compressor and the medium-pressure discharge port of the second compressor are commonly connected to the refrigerant inlet of the third condenser. The refrigerant outlet of the third condenser is connected to the low-pressure suction port of the second compressor through a second compression cycle pipeline; The distilled water collection tank further includes a water outlet. The outlet of the distilled water collection tank is divided into a first branch and a second branch. The first branch is connected to a high-temperature storage tank after heat exchange with the first compression cycle pipeline. The high-temperature storage tank is used to hold distilled water at a first temperature value. The second branch is connected to a low-temperature storage tank after heat exchange with the second compression cycle pipeline. The low-temperature storage tank is used to hold distilled water at a second temperature value. The first temperature value is greater than the second temperature value; The outlet of the first evaporator is divided into two branches. One branch is connected to the low-pressure suction port of the first compressor through a ninth control valve, and the other branch is connected to the low-pressure suction port of the second compressor through an eighth control valve; A condenser assembly is arranged on the first compression cycle pipeline. The condenser assembly includes at least one group of condensers. The condenser assembly includes a refrigerant channel and a distilled water channel. The refrigerant channel inlet of the condenser assembly is connected to the high-pressure discharge port of the first compressor, and its refrigerant channel outlet is connected to the refrigerant channel inlet of the first evaporator through a first throttling component. The distilled water channel inlet of the condenser assembly is connected to the bottom water outlet of the distilled water collection tank, and the distilled water channel outlet of the condenser assembly is connected to the high-temperature storage tank; A second evaporator is arranged on the second compression cycle pipeline. The second evaporator includes a refrigerant channel and a distilled water channel. The refrigerant channel inlet of the second evaporator is connected to one end of the outlet of the third condenser, the refrigerant channel outlet of the second evaporator is connected to the low-pressure suction port of the second compressor, the distilled water channel inlet of the second evaporator is connected to the bottom outlet of the distilled water collection tank, and its distilled water channel outlet is connected to the low-temperature storage tank; It further includes a first regenerator. The refrigerant channel inlet of the first regenerator is connected to the refrigerant outlet of the third condenser. The refrigerant channel outlet of the first regenerator is divided into two branches. One branch is connected to the refrigerant inlet of the first evaporator through a second throttling component, and the other branch is connected to the refrigerant channel inlet of the second evaporator through a third throttling component.

2. A dual-temperature clean water and domestic hot water co-production system according to claim 1, characterized in that: It further includes an automatic air extraction unit which is connected to the space above the liquid level of the sealed tank and is used to extract the non-condensable gas in the sealed tank so as to form a negative pressure environment in the internal space above the liquid level of the sealed tank.

3. A dual-temperature clean water and domestic hot water co-production system according to claim 1, characterized in that: It further includes a steam-water heat exchanger which is located inside or above the distilled water collection tank and is used to exchange heat and condense the water vapor in the sealed tank and collect it into the distilled water collection tank. The domestic water in the steam-water heat exchanger channel is heated to a third temperature value which is less than the first temperature value and greater than the second temperature value.

4. A dual-temperature clean water and domestic hot water co-production system according to claim 1, characterized in that: The medium-pressure exhaust port of the first compressor is connected to the inlet pipeline of the third condenser through check valve I, and the medium-pressure exhaust port of the second compressor is connected to the inlet pipeline of the third condenser through check valve II.

5. A method for co-producing dual-temperature clean water and domestic hot water of a dual-temperature clean water and domestic hot water co-production system according to any one of claims 1-4, characterized in that: The specific steps are as follows: When operating in the co-production mode of low-temperature distilled water and domestic hot water, the compression cycle unit composed of the first compressor, the second compressor, the third condenser, the second throttling component, the third throttling component, the first evaporator, the second evaporator, the first regenerator, the second regenerator, check valve I and check valve II produces low-temperature distilled water and domestic hot water. When operating in the co-production mode of high-temperature distilled water and domestic hot water, the compression cycle unit composed of the first compressor, the second compressor, the first condenser, the second condenser, the third condenser, the first throttling component, the second throttling component, the first evaporator, the first regenerator, check valve I, check valve II, the eighth control valve and the ninth control valve produces high-temperature distilled water and domestic hot water. When operating in the co-production mode of dual-temperature distilled water and domestic hot water, the compression cycle unit composed of the first compressor, the second compressor, the first condenser, the second condenser, the third condenser, the first throttling component, the second throttling component, the third throttling component, the first evaporator, the second evaporator, the first regenerator, the second regenerator, check valve I, check valve II, the eighth control valve and the ninth control valve produces high-temperature distilled water, low-temperature distilled water and domestic hot water. The temperature of the domestic hot water is between that of the low-temperature distilled water and the high-temperature distilled water.

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