Heat pump system capable of recycling waste heat

Abstract

The invention discloses a heat pump system capable of recycling waste heat, and relates to the technical field of heat pump systems. Comprising a heat exchange system and a water storage system, the heat exchange system comprises a compressor and a four-way reversing valve matched with the compressor, and a first heat exchanger, a third heat exchanger, a first throttling expansion valve and a fourth heat exchanger are sequentially connected to the four-way reversing valve in series through circulating pipelines to form a circulating loop; the heat exchange system further comprises a second heat exchanger connected with the first heat exchanger in parallel through a circulating pipeline. The water storage system comprises a high-temperature heating water tank with a built-in heat exchanger I, a high-temperature heat preservation water tank with a built-in heat exchanger II and a medium-temperature water tank with a built-in heat exchanger III; a water inlet of the water pump I is respectively communicated with the high-temperature heating water tank and the high-temperature heat preservation water tank through water pipes; a water outlet of the first water pump communicates with the high-temperature heat preservation water tank and the medium-temperature water tank through water pipes correspondingly, and water level sensors and temperature sensors are arranged in the high-temperature heating water tank, the high-temperature heat preservation water tank and the medium-temperature water tank correspondingly.

Description

Technical Field

[0001] The invention relates to the technical field of heat pump systems, and in particular to a heat pump system capable of recycling waste heat. Background Art

[0002] The heat pump system is an energy-efficient heating, cooling and hot water supply device that achieves temperature regulation by transferring heat energy from the environment (rather than directly converting electricity into heat energy). Its core principle is based on the second law of thermodynamics and can generate several times the heat output with less energy input.

[0003] The heat pump achieves heat energy transfer through the refrigeration cycle (reverse Carnot cycle). The main processes include: evaporation (low-temperature liquid refrigerant absorbs heat from the air, soil or water in the evaporator and evaporates into gas), compression (the compressor consumes electrical energy to compress the low-temperature gaseous refrigerant into high-temperature and high-pressure gas), condensation (high-temperature refrigerant releases heat in the condenser and condenses into liquid at the same time), and expansion (the expansion valve reduces the refrigerant pressure and temperature and re-enters the evaporator cycle).

[0004] At present, there are many operating scenarios that require refrigeration supply, high-temperature water (70-80 degrees) supply and medium-temperature water (35-40 degrees) supply at the same time. In the existing technology, the refrigeration needs of these scenarios are met through conventional evaporator heat exchange and air-cooled units. During the refrigeration process, the air-cooled units discharge heat into the air in vain, causing thermal pollution. On the other hand, the supply demand of high-temperature water and medium-temperature water is met by heating stored water through boiler combustion, electric heating, etc., which increases the energy consumption and cost of the hot water part.

[0005] At the same time, in some of the above-mentioned scenarios that require refrigeration supply, high-temperature water supply and medium-temperature water supply, it is necessary to ensure that high-temperature water is available on demand and medium-temperature water is supplied in sufficient quantity. However, the temporary heating of a large amount of low-temperature water may take a long time, resulting in the failure to supply high-temperature water in a timely manner. Summary of the invention

[0006] The purpose of the present invention is to provide a heat pump system that can recycle waste heat. The heat pump system includes a heat exchange system and a water storage system. The heat exchange system can simultaneously meet the needs of refrigeration, high-temperature water heating and medium-temperature water heating, realize energy recovery and utilization, reduce heat energy loss and waste, reduce energy consumption and costs, and at the same time, high-temperature water can be heated in small amounts and stored in large amounts to meet the need for high-temperature water to be taken as needed.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solutions: a heat pump system capable of waste heat recovery and utilization, comprising a heat exchange system and a water storage system, wherein the heat exchange system comprises a compressor and a four-way reversing valve matched with the compressor, and the four-way reversing valve is connected in series with a heat exchanger 1, a heat exchanger 3, a throttling expansion valve 1 and a heat exchanger 4 in sequence through a circulation pipeline to form a circulation loop; The heat exchange system further includes a second heat exchanger connected in parallel with the first heat exchanger through a circulation pipeline, and a solenoid valve A and a solenoid valve are respectively arranged corresponding to the parallel pipeline of the first heat exchanger and the second heat exchanger; The water storage system includes a high-temperature heating water tank with the first heat exchanger installed therein, a high-temperature heat preservation water tank with the second heat exchanger installed therein, and a medium-temperature water tank with the third heat exchanger installed therein; it further includes a first water pump, and the water inlet of the first water pump is communicated with the high-temperature heating water tank and the high-temperature heat preservation water tank respectively through water pipes; solenoid valves G and H are respectively arranged on the corresponding water pipes, and the water outlet of the first water pump is communicated with the high-temperature heat preservation water tank and the medium-temperature water tank respectively through water pipes, and solenoid valves I and J are respectively arranged on the corresponding water pipes; Water level sensors and temperature sensors are arranged in the high-temperature heating water tank, the high-temperature heat preservation water tank and the medium-temperature water tank, and the high-temperature heating water tank and the medium-temperature water tank are respectively connected with a water source through solenoid valves K and L.

[0008] Preferably, a second water pump is used to add water into the high-temperature heating water tank and the medium-temperature water tank respectively. The water inlet of the second water pump is connected with a water source through a water pipe, the water outlet of the second water pump is communicated with the high-temperature heating water tank and the medium-temperature water tank respectively through water pipes, the solenoid valve K is arranged on the water pipe between the second water pump and the high-temperature heating water tank, and the solenoid valve L is arranged on the water pipe between the second water pump and the medium-temperature water tank.

[0009] Preferably, a solenoid valve C is arranged on the circulation pipeline at the rear end of the refrigerant outlet of the third heat exchanger in the heat exchange system. A fifth heat exchanger is further included. The refrigerant inlet of the fifth heat exchanger is connected to the circulation pipeline between the solenoid valve C and the first throttling expansion valve through a pipeline, and a second throttling expansion valve is arranged on this section of pipeline; the refrigerant outlet of the fifth heat exchanger is connected to the circulation pipeline between the four-way reversing valve and the first heat exchanger through a pipeline, and a solenoid valve D is arranged on this section of pipeline. At the same time, this part of the connection port is located at the front end of the solenoid valve A and the solenoid valve B172; a solenoid valve E is further included. The liquid inlet of the solenoid valve E is connected to the circulation pipeline between the fourth heat exchanger and the four-way reversing valve through a pipeline, and the liquid outlet of the solenoid valve E is connected to the circulation pipeline between the solenoid valve D and the fifth heat exchanger through a pipeline.

[0010] Compared with the prior art, the beneficial effects of the present invention are: 1. In the present invention, the heat pump system includes a heat exchange system and a water storage system. Through the heat exchange system, the requirements of refrigeration, high-temperature water heating and medium-temperature water heating can be simultaneously met, energy recovery and utilization can be realized, heat energy loss and waste can be reduced, and energy consumption and cost can be lowered.

[0011] 2. In the present invention, the heating of high-temperature water is divided into two parts: rapid heating of a small amount of water and storage of a large amount of water. The water storage capacity of the high-temperature heating water tank is relatively small, which facilitates the rapid heating of the stored water to a high temperature. The stored water heated to a high temperature is promptly introduced into the high-temperature heat preservation water tank for use. The water storage capacity of the high-temperature heat preservation water tank is relatively large to facilitate the storage of a large amount of high-temperature water to meet the on-demand use of high-temperature water. This can avoid the situation where it takes a long time to heat a large amount of low-temperature water and the heating temperature is insufficient when high-temperature water is needed promptly.

[0012] 3. In the present invention, two sets of heat exchangers for refrigeration (Heat Exchanger Four and Heat Exchanger Five) are provided. By adjusting the corresponding pipelines and solenoid valves, the connection state between the two sets of heat exchangers can be adjusted to parallel or series. When in parallel, both sets of heat exchangers for refrigeration can operate normally for refrigeration without affecting the working conditions of water heating; when in series, one of the two sets of heat exchangers for refrigeration operates normally for refrigeration, and the other set defrosts, without affecting the working conditions of water heating; the refrigerant flow direction is adjusted through a four-way reversing valve to change the heat exchanger that needs to defrost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Structural schematic of the present invention Figure 1 (Single refrigeration area); Figure 2 Structural schematic of the present invention Figure 2 (Two refrigeration areas).

[0014] In the figure: 111 - Compressor, 112 - Four-way reversing valve, 12 - Heat Exchanger One, 13 - Heat Exchanger Two, 14 - Heat Exchanger Three, 151 - Throttle expansion valve One, 152 - Throttle expansion valve Two, 16 - Heat Exchanger Four, 171 - Solenoid valve A, 172 - Solenoid valve B, 181 - Solenoid valve C, 182 - Solenoid valve D, 183 - Solenoid valve E, 19 - Heat Exchanger Five, 21 - High-temperature heating water tank, 211 - Water level sensor One, 212 - Temperature sensor One, 22 - High-temperature heat preservation water tank, 221 - Water level sensor Two, 222 - Temperature sensor Two, 23 - Medium-temperature water tank, 231 - Water level sensor Three, 232 - Temperature sensor Three, 24 - Water pump One, 241 - Solenoid valve G, 242 - Solenoid valve H, 243 - Solenoid valve I, 244 - Solenoid valve J, 25 - Water pump Two, 251 - Solenoid valve K, 252 - Solenoid valve L, 3 - Refrigeration area One, 4 - Refrigeration area Two. DETAILED DESCRIPTION OF THE INVENTION

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0016] As Figure 1 shown, a heat pump system capable of waste heat recovery and utilization includes a heat exchange system and a water storage system. The heat exchange system includes a compressor 111 and a four-way reversing valve 112 that cooperates with the compressor 111. A first heat exchanger 12 for heating, a third heat exchanger 14 for heating, a first throttling expansion valve 151, and a fourth heat exchanger 16 for refrigeration are sequentially connected in series through a circulation pipeline on the four-way reversing valve 112 to form a circulation loop.

[0017] The heat exchange system further includes a second heat exchanger 13 connected in parallel with the first heat exchanger 12 through a circulation pipeline. Solenoid valves A 171 and solenoid valves B 172 are respectively arranged on the parallel pipelines of the first heat exchanger 12 and the second heat exchanger 13.

[0018] The water storage system includes a high-temperature heating water tank 21 with the first heat exchanger 12 built therein, a high-temperature heat preservation water tank 22 with the second heat exchanger 13 built therein, and a medium-temperature water tank 23 with the third heat exchanger 14 built therein; it further includes a first water pump 24. The water inlet of the first water pump 24 is respectively communicated with the high-temperature heating water tank 21 and the high-temperature heat preservation water tank 22 through water pipes; solenoid valves G 241 and solenoid valves H 242 are respectively arranged on the corresponding water pipes. The water outlet of the first water pump 24 is respectively communicated with the high-temperature heat preservation water tank 22 and the medium-temperature water tank 23 through water pipes; solenoid valves I 243 and solenoid valves J 244 are respectively arranged on the corresponding water pipes.

[0019] A water level sensor and a temperature sensor are arranged in each of the high-temperature heating water tank 21, the high-temperature heat preservation water tank 22, and the medium-temperature water tank 23. The high-temperature heating water tank 21 and the medium-temperature water tank 23 are respectively connected to an external water source through solenoid valves K 251 and solenoid valves L 252.

[0020] In this embodiment, a refrigerant (heat exchange agent), such as Freon, is arranged in the circulation loop of the heat exchange system, and the refrigerant circulates in the loop under the compression power of the compressor 111.

[0021] In this embodiment, the exhaust port of the compressor 111 is connected to the refrigerant inlet of the four-way reversing valve 112, and the suction port of the compressor 111 is connected to the refrigerant outlet of the four-way reversing valve 112 through a pipeline; the two circulation interfaces of the four-way reversing valve 112 are used for series connection of the circulation loop. The main function of the four-way reversing valve 112 is to change the circulation direction of the refrigerant in the loop. Therefore, the two circulation interfaces of the four-way reversing valve 112 do not need to consider the circulation direction of the refrigerant and can be directly connected in series in the circulation loop. Since both the four-way reversing valve and the compressor are existing conventional technologies, their specific structures and connection methods will not be elaborated here.

[0022] Specifically in this embodiment, the water pump two 25 is used to add water to the high-temperature heating water tank 21 and the medium-temperature water tank 23 respectively. The water inlet of the water pump two 25 is connected to an external water source through a water pipe, and the water outlet of the water pump two 25 is communicated with the high-temperature heating water tank 21 and the medium-temperature water tank 23 respectively through water pipes. The solenoid valve K251 is arranged on the water pipe between the water pump two 25 and the high-temperature heating water tank 21, and the solenoid valve L252 is arranged on the water pipe between the water pump two 25 and the medium-temperature water tank 23.

[0023] For the convenience of description, the water level sensor and temperature sensor located inside the high-temperature heating water tank 21 are tentatively designated as: water level sensor one 211, temperature sensor one 212; the water level sensor and temperature sensor located inside the high-temperature heat preservation water tank 22 are tentatively designated as: water level sensor two 221, temperature sensor two 222; the water level sensor and temperature sensor located inside the medium-temperature water tank 23 are tentatively designated as: water level sensor three 231, temperature sensor three 232.

[0024] In this embodiment, it also includes a controller for controlling the operation of the compressor 111, the four-way reversing valve 112, each water pump and each solenoid valve, such as a PLC controller, an industrial control computer, etc., to set and control the operating state of the above structures. The PLC controller and the industrial control computer belong to existing conventional technologies and can be rotated adaptively according to actual usage requirements. The specific structure of the controller and the connection methods between the controller and the compressor 111, each water pump, and each solenoid valve will not be elaborated here.

[0025] Working principle: First, the solenoid valve K251 and the solenoid valve L252 in the water storage system are opened, and under the action of the water pump two 25, the external water source is introduced into the high-temperature heating water tank 21 and the medium-temperature water tank 23 respectively. When the water volume inside the high-temperature heating water tank 21 reaches the highest set value of the water level sensor one 211, the solenoid valve K251 is closed. When the water volume inside the medium-temperature water tank 23 reaches the highest set value of the water level sensor three 231, the solenoid valve L252 is closed.

[0026] Meanwhile, solenoid valve A171 and solenoid valve B172 in the heat exchange system are both opened. After the high-temperature and high-pressure refrigerant gas compressed by the compressor 111 passes through solenoid valve A171 and solenoid valve B172, it flows through heat exchanger one 12 and heat exchanger two 13 respectively. The water in the high-temperature heating water tank 21 exchanges heat with the high-temperature and high-pressure refrigerant gas through heat exchanger one 12, and the water in the high-temperature heating water tank 21 is heated to high-temperature water at 70 - 80 degrees. After the temperature sensor one 212 detects that the water in the high-temperature heating water tank 21 reaches the set temperature (any temperature between 70 - 80 degrees), water pump one 24 starts to operate. At this time, solenoid valve G241 and solenoid valve I243 are opened, and solenoid valve H242 and solenoid valve J244 are closed. Under the action of water pump one 24, the high-temperature water in the high-temperature heating water tank 21 enters the high-temperature heat preservation water tank 22 through the corresponding water pipes. At the same time, the high-temperature and high-pressure refrigerant gas flowing through heat exchanger two 13 in the heat exchange system exchanges heat with the water in the high-temperature heat preservation water tank 22, forming a high-temperature heat preservation effect on the stored water in the high-temperature heat preservation water tank 22. When the water in the high-temperature heat preservation water tank 22 reaches the heat preservation set value (any temperature between 70 - 80 degrees), solenoid valve B172 is closed, so that all the high-temperature and high-pressure refrigerant gas in the heat exchange system flows through heat exchanger one 12.

[0027] The refrigerant flowing out of heat exchanger one 12 alone (under the condition that solenoid valve B172 is closed and the high-temperature heat preservation water tank 22 is not heat-preserved), or the refrigerant flowing out of heat exchanger one 12 and heat exchanger two 13 simultaneously (under the condition that solenoid valve B172 is opened and the high-temperature heat preservation water tank 22 is heat-preserved) then flows into heat exchanger three 14. The refrigerant carrying residual heat (35 - 40 degrees) exchanges heat with the stored water inside the medium-temperature water tank 23 through heat exchanger three 14 and heats the stored water to medium temperature (35 - 40 degrees).

[0028] (Special note for solenoid valve B172 being closed: When the water in the high-temperature heat preservation water tank 22 reaches the heat preservation set value, the heat exchange of the high-temperature and high-pressure refrigerant gas flowing through heat exchanger two 13 approaches heat exchange equilibrium. Therefore, the refrigerant gas flowing out of heat exchanger two 13 still carries a large amount of heat energy. If solenoid valve B172 is not closed, it may cause the stored water inside the medium-temperature water tank 23 to be heated to medium-high temperature (about 55 degrees). Therefore, after solenoid valve B172 is closed, all the high-temperature and high-pressure refrigerant gas flows through heat exchanger one 12, which can not only increase the heating efficiency of the stored water in the high-temperature heating water tank 21, but also prevent the stored water in the medium-temperature water tank 23 from being heated to medium-high temperature.) (Note that the high-temperature heating water tank 21 is used to quickly heat the stored water to a high temperature state. The stored water heated to a high temperature is promptly introduced into the high-temperature heat preservation water tank 22 for use to meet the on-demand use of high-temperature water. Therefore, the water storage capacity of the high-temperature heating water tank 21 is relatively small to facilitate the rapid heating of the stored water to a high temperature, and the water storage capacity of the high-temperature heat preservation water tank 22 is relatively large to facilitate the storage of a large amount of high-temperature water. The first heat exchanger 12 can be adapted according to the capacity of the high-temperature heating water tank 21 and the heating requirement, and the second heat exchanger 13 can be adapted according to the capacity of the high-temperature heat preservation water tank 22 and the heat preservation requirement.) The refrigerant flowing out of the third heat exchanger 14 enters the first throttling expansion valve 151. After being throttled and vaporized by the first throttling expansion valve 151, the temperature of the refrigerant decreases. The low-temperature refrigerant flows through the fourth heat exchanger 16 and absorbs heat through the fourth heat exchanger 16, cooling the surroundings of the fourth heat exchanger 16 to meet the refrigeration requirement.

[0029] The refrigerant flowing out of the fourth heat exchanger 16 circulates back to the compressor 111 through the four-way reversing valve 112 again to complete a heat exchange cycle.

[0030] When a large amount of medium-temperature water is needed, control the solenoid valve G241 and solenoid valve I243 to close, solenoid valve H242 and solenoid valve J244 to open, solenoid valve K251 to close, solenoid valve L252 to open, and at the same time, turn on the first water pump 24 and the second water pump 25. The high-temperature water inside the high-temperature heat preservation water tank 22 and the low-temperature water from the outside are simultaneously introduced into the medium-temperature water tank 23 to form medium-temperature water to meet the use of a large amount of medium-temperature water. When mixing high-temperature water and low-temperature water, use the third temperature sensor 232 to detect whether the temperature of the mixed water meets the requirement of medium-temperature water. If the temperature is too low, control the solenoid valve L252 to close and add more high-temperature water; if the temperature of the mixed water is too high, stop the delivery of high-temperature water and add more low-temperature water. In this way, high-temperature water and low-temperature water are alternately added to ensure the temperature requirement of medium-temperature water.

[0031] In addition, an alarm device, such as a buzzer or a warning light (not shown in the figure), can be set. When the high-temperature water inside the high-temperature heat preservation water tank 22 reaches the highest set value of the second water level sensor 221, the alarm device gives an early warning to prompt the staff that the high-temperature water is full, and some high-temperature water can be drained for use first to make room for the high-temperature heat preservation water tank 22 to continue storing high-temperature water. Of course, the application scenario of the high-temperature water in the present invention is frequent use and on-demand use, and the situation of full storage of high-temperature water generally does not occur during actual operation.

[0032] Furthermore, as Figure 2As shown, a solenoid valve C181 is provided on the circulation pipeline at the rear end of the refrigerant outlet of the heat exchanger three 14 in the heat exchange system. The heat exchange system further includes a heat exchanger five 19. The refrigerant inlet of the heat exchanger five 19 is connected to the circulation pipeline between the solenoid valve C181 and the throttling expansion valve one 151 through a pipeline, and a throttling expansion valve two 152 is provided on this section of the pipeline. The refrigerant outlet of the heat exchanger five 19 is connected to the circulation pipeline between the four-way reversing valve 112 and the heat exchanger one 12 through a pipeline, and a solenoid valve D182 is provided on this section of the pipeline. At the same time, this part of the connection port is located at the front end of the solenoid valve A171 and the solenoid valve B172 (i.e., the part of the circulation pipeline connected to the refrigerant inlets of the solenoid valve A171 and the solenoid valve B172). The heat exchange system further includes a solenoid valve E183. The liquid inlet of the solenoid valve E183 is connected to the circulation pipeline between the heat exchanger four 16 and the four-way reversing valve 112 through a pipeline, and the liquid outlet of the solenoid valve E183 is connected to the circulation pipeline between the solenoid valve D182 and the heat exchanger five 19 through a pipeline. In this way, the heat exchanger five 19 forms a series connection with the heat exchanger four 16 through the pipeline corresponding to the throttling expansion valve two 152 and the solenoid valve D182, and the heat exchanger five 19 forms a parallel connection with the heat exchanger four 16 through the pipeline corresponding to the throttling expansion valve two 152 and the solenoid valve E183.

[0033] In this way, when the heat exchange system is in normal refrigeration and heating of the stored water, the solenoid valve A171 and the solenoid valve C181 are in the open state, and the solenoid valve B172 is opened or closed according to the heat preservation setting requirement of the temperature sensor two 222. In this way, the refrigerant in the heat exchange system can normally pass through the heat exchanger one 12, the heat exchanger two 13 and the heat exchanger three 14. At the same time, the solenoid valve D182 is closed and the solenoid valve E183 is opened. The heat exchanger five 19 and the heat exchanger four 16 are in a parallel state. The refrigerant flows into the heat exchanger four 16 and the heat exchanger five 19 through the throttling expansion valve one 151 and the throttling expansion valve two 152 respectively for refrigeration, and the refrigerant flowing out of the heat exchanger four 16 and the heat exchanger five 19 is re-merged into the compressor 111 to complete a heat exchange cycle.

[0034] When defrosting is required, the solenoid valve A171, the solenoid valve B172 and the solenoid valve C181 are closed. At this time, the heat exchanger one 12, the heat exchanger two 13 and the heat exchanger three 14 are in an isolated state in the circulation loop of the heat exchange system. At the same time, the solenoid valve D182 is opened and the solenoid valve E183 is closed. The heat exchanger five 19 and the heat exchanger four 16 are in a series state.

[0035] When defrosting the fifth heat exchanger 19, the high-temperature and high-pressure refrigerant gas compressed by the compressor flows towards the fifth heat exchanger 19. The high-temperature and high-pressure refrigerant gas exchanges heat and releases heat with the frost formed at the fifth heat exchanger 19. The frost absorbs heat and melts, completing the defrosting. After the refrigerant that has released heat flows out of the fifth heat exchanger 19, it is depressurized and vaporized successively through the second throttling expansion valve 152 and the first throttling expansion valve 151, and its temperature decreases. The low-temperature refrigerant flows through the fourth heat exchanger 16 and absorbs heat through the fourth heat exchanger 16, causing the temperature around the fourth heat exchanger 16 to drop. The fourth heat exchanger 16 operates normally for refrigeration. The refrigerant flowing out of the fourth heat exchanger 16 flows back into the compressor 111 to complete a heat exchange cycle.

[0036] Similarly, when defrosting the fourth heat exchanger 16, the flow direction of the refrigerant is changed through the four-way reversing valve 112, so that the high-temperature and high-pressure refrigerant gas compressed by the compressor flows towards the fourth heat exchanger 16. The high-temperature and high-pressure refrigerant gas exchanges heat and releases heat with the frost formed at the fourth heat exchanger 16. The frost absorbs heat and melts, completing the defrosting. After the refrigerant that has released heat flows out of the fourth heat exchanger 16, it is depressurized and vaporized successively through the first throttling expansion valve 151 and the second throttling expansion valve 152, and its temperature decreases. The low-temperature refrigerant flows through the fifth heat exchanger 19 and absorbs heat through the fifth heat exchanger 19, causing the temperature around the fifth heat exchanger 19 to drop. The fifth heat exchanger 19 operates normally for refrigeration. The refrigerant flowing out of the fifth heat exchanger 19 flows back into the compressor 111 to complete a heat exchange cycle.

[0037] In this way, when the first heat exchanger 12, the second heat exchanger 13, and the third heat exchanger 14 are isolated for defrosting operations, it does not affect the temporary normal use of the water storage system, does not cool down the corresponding heat exchangers in the water storage system, and at the same time can ensure that some of the heat exchangers used for refrigeration operate normally for refrigeration.

[0038] In this embodiment, the fourth heat exchanger 16 and the fifth heat exchanger 19 can be used in the same application scenario or can be applied to different scenarios respectively. Whether they are applied to the same scenario does not affect the defrosting operations of the heat exchangers with frost formation.

[0039] Example of an application scenario 1: Refrigeration demand and hot water supply demand in a milking hall.

[0040] The fresh milk produced in the milking hall needs to be cooled in time and stored for preservation. On the other hand, the milking hall requires high-temperature water to disinfect milking tools and containers, etc., and also requires medium-temperature water to meet the hygiene cleaning and daily life needs of milking staff.

[0041] During implementation, the first refrigeration zone 3 of the fourth heat exchanger 16 can be the milk tank in the milking hall, the second refrigeration zone 4 of the fifth heat exchanger 19 can be the cold storage for subsequent dairy products, the high-temperature water stored in the high-temperature insulation water tank 22 is used for high-temperature disinfection treatment of milking tools and containers in the milking hall, the medium-temperature water in the medium-temperature water tank 23 is used for the milking hall and the staff dormitory, the medium-temperature water in the milking hall is used for the sanitary cleaning of milking employees, and the medium-temperature water in the staff dormitory is used for the daily life of employees.

[0042] The above situation when a large amount of medium-temperature water is needed generally occurs during the non-operating period of the milking hall. For example, when employees get off work at night, the milking hall temporarily does not need high-temperature water, but the employees in the staff dormitory need a large amount of medium-temperature water for daily life (such as washing clothes, washing, taking a bath, etc.). At this time, the high-temperature water in the high-temperature insulation water tank 22 is mixed with the low-temperature water from the outside to form medium-temperature water to meet the daily use.

[0043] Example two of the application scenario: The refrigeration demand and hot water supply demand of a slaughterhouse.

[0044] When a slaughterhouse produces fresh meat, it is necessary to cool the fresh meat in time and store it in a fresh-keeping manner. On the other hand, the slaughterhouse needs high-temperature water to disinfect the slaughtering knives and the utensils for holding meat products. At the same time, medium-temperature water is also needed to meet the sanitary cleaning and daily life use of the staff in the slaughterhouse.

[0045] During implementation, the first refrigeration zone 3 of the fourth heat exchanger 16 can be the workshop area of the slaughterhouse, keeping the workshop at a low temperature, not easy to breed bacteria, flies, etc. The fifth heat exchanger 19 can be the cold storage for the meat products in the slaughterhouse. The high-temperature water stored in the high-temperature insulation water tank 22 is used for high-temperature disinfection and cleaning of the knives and containers in the slaughterhouse. The medium-temperature water in the medium-temperature water tank 23 is used for the workshop of the slaughterhouse and the staff dormitory. The medium-temperature water in the workshop of the slaughterhouse is used for the sanitary cleaning of milking employees, and the medium-temperature water in the staff dormitory is used for the daily life of employees.

[0046] The situation when a large amount of medium-temperature water is needed is the same as that in application scenario one.

[0047] Due to the high-temperature water demand in scenarios such as milking tools in the milking hall or slaughtering tools in the slaughterhouse, high-temperature water needs to be frequently used for cleaning and disinfection. Although the amount used each time is small, high-temperature water also needs to be readily available in the corresponding scenarios. Therefore, rapid heating in small amounts is required to meet the demand for readily available high-temperature hot water in the above scenarios.

[0048] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Accordingly, all changes that fall within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A heat pump system capable of recovering and utilizing waste heat, characterized in that: It includes a heat exchange system and a water storage system. The heat exchange system includes a compressor and a four-way reversing valve that cooperates with the compressor. A heat exchanger I, a heat exchanger III, a throttling expansion valve I, and a heat exchanger IV are successively connected in series through a circulation pipeline on the four-way reversing valve to form a circulation loop; The heat exchange system also includes a heat exchanger II connected in parallel with the heat exchanger I through a circulation pipeline. Solenoid valves A and B are respectively arranged on the parallel pipeline of the heat exchanger I and the heat exchanger II; The water storage system includes a high-temperature heating water tank with the heat exchanger I installed inside, a high-temperature heat preservation water tank with the heat exchanger II installed inside, and a medium-temperature water tank with the heat exchanger III installed inside; it also includes a water pump I. The water inlet of the water pump I is connected to the high-temperature heating water tank and the high-temperature heat preservation water tank respectively through water pipes; solenoid valves G and H are respectively arranged on the corresponding water pipes. The water outlet of the water pump I is connected to the high-temperature heat preservation water tank and the medium-temperature water tank respectively through water pipes; solenoid valves I and J are respectively arranged on the corresponding water pipes; Water level sensors and temperature sensors are arranged in the high-temperature heating water tank, the high-temperature heat preservation water tank, and the medium-temperature water tank. The high-temperature heating water tank and the medium-temperature water tank are respectively connected to the water source through solenoid valves K and L.

2. The heat pump system capable of recovering and utilizing waste heat according to claim 1, wherein: A water pump II is used to add water to the high-temperature heating water tank and the medium-temperature water tank respectively. The water inlet of the water pump II is connected to the water source through a water pipe. The water outlet of the water pump II is connected to the high-temperature heating water tank and the medium-temperature water tank respectively through water pipes. The solenoid valve K is arranged on the water pipe between the water pump II and the high-temperature heating water tank. The solenoid valve L is arranged on the water pipe between the water pump II and the medium-temperature water tank.

3. A heat pump system capable of recovering and utilizing waste heat according to claim 1, characterized in that: A solenoid valve C is arranged on the circulation pipeline at the rear end of the refrigerant outlet of the heat exchanger III in the heat exchange system. It also includes a heat exchanger V. The refrigerant inlet of the heat exchanger V is connected to the circulation pipeline between the solenoid valve C and the throttling expansion valve I through a pipeline. A throttling expansion valve II is arranged on this section of the pipeline; the refrigerant outlet of the heat exchanger V is connected to the circulation pipeline between the four-way reversing valve and the heat exchanger I through a pipeline. A solenoid valve D is arranged on this section of the pipeline. At the same time, this part of the connection port is located at the front end of the solenoid valve A and the solenoid valve B172; it also includes a solenoid valve E. The liquid inlet of the solenoid valve E is connected to the circulation pipeline between the heat exchanger IV and the four-way reversing valve through a pipeline. The liquid outlet of the solenoid valve E is connected to the circulation pipeline between the solenoid valve D and the heat exchanger V through a pipeline.

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