Heat pump system

Abstract

The present application relates to the technical field of heat pump, provide a kind of heat pump system, comprising: use side fluid pipeline;Waste heat source fluid pipeline;Multiple heat pump circulation units, multiple the heat pump circulation units are independent, the second heat exchange side of the condenser of multiple the heat pump circulation units is in turn connected;The second heat exchange side import of the evaporator of each the heat pump circulation unit is connected with the waste heat source fluid import pipeline, and the second heat exchange side export of the evaporator of each the heat pump circulation unit is connected with the waste heat source fluid export pipeline.The heat pump system given in the present application effectively improves the overall efficiency of heat pump system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat pump, in particular to a heat pump system. BACKGROUND

[0002] With the increasingly serious global energy situation and environmental pollution, energy saving and emission reduction has become the focus of the world, and energy saving technology has become the goal of active research and development of various countries. In the process of industrial and agricultural production, production processes with high heat demand generally use oil / gas boilers for heating, and production processes with low heat demand generally use electric heating or electric boilers. However, in the process of industrial and agricultural production, there are still a large amount of medium and low temperature waste heat sources that are not utilized. Therefore, in the production process, heat pump technology is used to recover medium and low temperature waste heat and is used for heating. Compared with the traditional boiler heating system, the heat pump technology has high thermal efficiency, significant energy saving and environmental protection effects, obvious economic benefits, safe and reliable equipment, and easy to realize higher automation.

[0003] At present, after using the air supplementing and enthalpy increasing technology, the heat pump technology can produce fluid or steam with a temperature of 80℃ or above, which basically meets the needs of most processes. However, the heat demand of high-temperature bodies used in industrial and agricultural production processes is huge, usually reaching megawatt to hundreds of megawatts.

[0004] In the prior art, in order to meet the super large heat capacity heat demand of industrial and agricultural production, a heat pump system with multiple compressors in parallel is generally used. However, due to the complex pipeline of the heat pump system, the oil return of the compressors is uneven, which easily leads to a decrease in the reliability of the system, and due to the large temperature increase of the heat pump system, the system efficiency is low. SUMMARY

[0005] The present application provides a heat pump system to solve the problem of uneven oil return and low efficiency of the heat pump system when multiple compressors are connected in parallel in the prior art, and to improve the efficiency of the heat pump system.

[0006] The present application provides a heat pump system, comprising:

[0007] a use side fluid pipeline, the use side fluid pipeline comprising a use side inlet pipeline and a use side outlet pipeline;

[0008] a waste heat source fluid pipeline, the waste heat source fluid pipeline comprising a waste heat source fluid inlet pipeline and a waste heat source fluid outlet pipeline;

[0009] A plurality of heat pump cycle units, the heat pump cycle unit comprising a condenser, an evaporator, a first throttling device and a compressor, the first heat exchange side of the condenser, the first heat exchange side of the evaporator, the first throttling device and the compressor are connected to a heat pump cycle main circuit, the plurality of heat pump cycle units are independent of each other, the second heat exchange side of the condenser of the plurality of heat pump cycle units are connected in series, the second heat exchange side inlet of the condenser of the first heat pump cycle unit is connected with the use side inlet pipeline, the second heat exchange side outlet of the condenser of the last heat pump cycle unit is connected with the use side outlet pipeline; the second heat exchange side inlet of the evaporator of each heat pump cycle unit is connected with the waste heat source fluid inlet pipeline, and the second heat exchange side outlet of the evaporator of each heat pump cycle unit is connected with the waste heat source fluid outlet pipeline.

[0010] According to the heat pump system provided by the application, the heat pump cycle unit further comprises an oil separator, an economizer and an oil cooler;

[0011] The outlet of the compressor, the refrigerant separation side of the oil separator, the first heat exchange side of the condenser, the first heat exchange side of the economizer, the first throttling device, the first heat exchange side of the evaporator and the inlet of the compressor are connected in series to form a heat pump cycle main circuit;

[0012] The inlet of the first heat exchange side of the oil cooler is connected with the lubricating oil separation side of the oil separator, and the outlet of the first heat exchange side of the oil cooler is connected with the inlet of the compressor to form a lubricating oil circulation circuit;

[0013] The inlet of the second heat exchange side of the oil cooler is connected with the waste heat source fluid pipeline, and the outlet of the second heat exchange side of the oil cooler is connected with the second heat exchange side of the evaporator;

[0014] Or, the inlet of the second heat exchange side of the oil cooler is connected with the outlet of the first throttling device, and the outlet of the second heat exchange side of the oil cooler is connected with the inlet of the compressor.

[0015] According to the heat pump system provided by the application, the heat pump cycle unit further comprises a second throttling device;

[0016] The inlet of the second throttling device is connected with the outlet of the first heat exchange side of the condenser, the outlet of the second throttling device is connected with the inlet of the second heat exchange side of the economizer, and the outlet of the second heat exchange side of the economizer is connected with the air supplement port of the compressor to form an air supplement branch.

[0017] According to the heat pump system provided by the application, the heat pump cycle unit further comprises a supercooler, and the first heat exchange side of the supercooler is connected between the condenser and the first throttling device.

[0018] According to the heat pump system provided by the application, the heat pump circulation unit further comprises a regenerator, a first heat exchange side of the regenerator being connected between the condenser and the first throttling device;

[0019] A second heat exchange side of the regenerator is connected between an outlet of the first heat exchange side of the evaporator and an inlet of the compressor.

[0020] According to the heat pump system provided by the application, the first throttling device comprises one of an electric regulating valve, an electronic expansion valve and a thermal expansion valve; and the second throttling device comprises one of a throttling orifice, an electronic expansion valve, a thermal expansion valve and an electric regulating valve.

[0021] According to the heat pump system provided by the application, the heat pump circulation unit further comprises a compressor controller, a plurality of temperature parameter sensors and a plurality of pressure parameter sensors, the plurality of temperature parameter sensors being respectively arranged at the compressor, the first heat exchange side of the evaporator, the first heat exchange side of the condenser and the inlet and outlet of the first throttling device, the plurality of pressure parameter sensors being respectively arranged at the compressor, the first heat exchange side of the evaporator, the first heat exchange side of the condenser and the inlet and outlet of the first throttling device, the compressor controller being connected with the plurality of pressure parameter sensors and the plurality of temperature parameter sensors to control the operation mode of the compressor according to the temperature parameters detected by the plurality of temperature parameter sensors and the pressure parameters detected by the plurality of pressure parameter sensors.

[0022] According to the heat pump system provided by the application, a high-temperature fluid valve and a high-temperature fluid storage tank are sequentially arranged on the use side inlet pipeline, a use side steam pipeline is connected to the upper portion of the high-temperature fluid storage tank, a use side liquid pipeline is connected to the lower portion of the high-temperature fluid storage tank, and a high-temperature fluid vapor compressor is arranged on the use side steam pipeline.

[0023] According to the heat pump system provided by the application, the heat pump system further comprises an integrated condenser, the first heat exchange side of the condenser of each of the plurality of heat pump circulation units being arranged on the integrated condenser, the second heat exchange side of the condenser of each of the plurality of heat pump circulation units being sequentially arranged in series and arranged in the integrated condenser, the integrated condenser having a use side high-temperature fluid inlet and a use side high-temperature fluid outlet, the use side high-temperature fluid inlet being communicated with the second heat exchange side inlet of the condenser of the heat pump circulation unit at the first end, the use side high-temperature fluid outlet being communicated with the second heat exchange side outlet of the condenser of the heat pump circulation unit at the last end, the use side high-temperature fluid inlet being connected with the use side inlet pipeline, and the use side high-temperature fluid outlet being connected with the use side outlet pipeline.

[0024] According to the heat pump system provided by the application, the first heat exchange side of the evaporator of each of the plurality of heat pump circulation units is arranged on the integrated evaporator, the second heat exchange side of the evaporator of each of the plurality of heat pump circulation units is arranged in parallel and arranged in the integrated evaporator, the integrated evaporator has a waste heat fluid inlet and a waste heat fluid outlet, the waste heat fluid inlet is connected to the second heat exchange side inlet of the evaporator of each of the plurality of heat pump circulation units, the waste heat fluid outlet is connected to the second heat exchange side outlet of the evaporator of each of the plurality of heat pump circulation units, and the waste heat fluid inlet is connected to the waste heat source fluid inlet pipeline and the waste heat fluid outlet is connected to the waste heat source fluid outlet pipeline.

[0025] The heat pump system provided by the application has the advantages that, by arranging the second heat exchange side of the evaporator of each of the plurality of heat pump circulation units in parallel, the evaporation temperature of the heat pump system is the same, by arranging the condensers of the plurality of heat pump circulation units in series, the temperature of the use side fluid is gradually increased, and finally the temperature of the use side fluid required by the user is reached, the condensation temperature of the heat pump circulation unit of the previous stage is always lower than the condensation temperature of the heat pump circulation unit of the next stage, the condensation pressure of the heat pump circulation unit of the previous stage is obviously reduced, and therefore the overall efficiency of the heat pump system is effectively improved. Compared with the high-temperature heat pump driven by a single compressor, the heat pump system provided by the application has sufficient heating capacity, compared with the heat pump system in which the condensers of a plurality of compressors are arranged in parallel to increase the temperature of the use side fluid, the heat pump system has uniform oil return, and the efficiency of the heat pump system is high, and therefore the heat pump system provides a more energy-saving and environment-friendly technical solution for the high-temperature heating demand of industrial and agricultural production processes. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 is a structural schematic diagram of the heat pump system provided by the first embodiment of the application;

[0028] Figure 2 is a structural schematic diagram of the heat pump circulation unit of the heat pump system provided by the first embodiment of the application;

[0029] Figure 3 is a structural schematic diagram of the heat pump system provided by the first embodiment of the application;

[0030] Figure 4 is a structural schematic diagram of the heat pump circulation unit of the heat pump system provided by the first embodiment of the application;

[0031] Figure 5 is a structural schematic diagram of a heat pump system provided by Embodiment Two of the present application;

[0032] Figure 6 is a structural schematic diagram of a heat pump system provided by Embodiment Three of the present application;

[0033] Figure 7 is a structural schematic diagram of a heat pump system provided by Embodiment Four of the present application;

[0034] Figure 8 is a structural schematic diagram of a heat pump system provided by Embodiment Five of the present application;

[0035] Figure 9 is a structural schematic diagram of an integrated condenser of a heat pump system provided by the present application;

[0036] Figure 10 is a structural schematic diagram of an integrated evaporator of a heat pump system provided by the present application;

[0037] Figure 11 is a pressure boosting diagram of each heat pump circulation unit of a heat pump system provided by the present application;

[0038] Reference Signs:

[0039] 10: heat pump circulation unit;

[0040] 11: condenser;

[0041] 12: evaporator;

[0042] 13: compressor;

[0043] 14: oil separator;

[0044] 15: economizer;

[0045] 16-1: first throttling device;

[0046] 16-2: second throttling device;

[0047] 17: oil cooler;

[0048] 18: subcooler;

[0049] 19: recuperator;

[0050] 101: integrated condenser;

[0051] 111: high-temperature fluid inlet on the use side;

[0052] 112: high-temperature fluid outlet on the use side.

[0053] 102: integrated evaporator;

[0054] 121: waste heat fluid inlet;

[0055] 122: waste heat fluid outlet;

[0056] 20: use side fluid line;

[0057] 21: use side inlet line;

[0058] 22: use side outlet line;

[0059] 23: high temperature fluid valve;

[0060] 24: high temperature fluid storage tank;

[0061] 25: high temperature fluid vapor compressor;

[0062] 30: waste heat source fluid line;

[0063] 31: waste heat source fluid inlet line;

[0064] 32: waste heat source fluid outlet line. DETAILED DESCRIPTION

[0065] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be described below in detail with reference to the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0066] The heat pump system can be used in industrial and agricultural production with super large heat capacity heat demand, the use side flow line is the side of the main heat demand, and the waste heat source fluid line can recycle and utilize low temperature waste heat, such as process cooling water at 40-60℃, cooling water of data center air conditioning system, etc. The use side fluid can be selected as water with pressure, and the waste heat source side fluid can be selected as water with normal pressure. According to the demand, the heat pump system given by the present application can be used in industrial and agricultural production with super large heat capacity heat demand in any field.

[0067] The heat pump system of the present application will be described below in detail with reference to the drawings in the present application. Figures 1-11 The heat pump system of the present application comprises:

[0068] Please refer to Figures 1 to 8 the use side fluid line 20, the use side fluid line 20 comprising a use side inlet line 21 and a use side outlet line 22;

[0069] A waste heat source fluid pipeline 30, which comprises a waste heat source fluid inlet pipeline 31 and a waste heat source fluid outlet pipeline 32;

[0070] A plurality of heat pump circulation units 10, which comprise a condenser 11, an evaporator 12, a first throttling device 16-1 and a compressor 13, the first heat exchange side of the condenser 11, the first heat exchange side of the evaporator 12, the first throttling device 16-1 and the compressor 13 are connected to a heat pump circulation main loop, the plurality of heat pump circulation units 10 are independent of each other, the second heat exchange side of the condenser 11 of the plurality of heat pump circulation units 10 are connected in series, the second heat exchange side inlet of the condenser 11 of the first heat pump circulation unit 10 is connected with the use side inlet pipeline 21, and the second heat exchange side outlet of the condenser 11 of the last heat pump circulation unit 10 is connected with the use side outlet pipeline 22; the second heat exchange side inlet of the evaporator 12 of each heat pump circulation unit 10 is connected with the waste heat source fluid inlet pipeline 31, and the second heat exchange side outlet of the evaporator 12 of each heat pump circulation unit 10 is connected with the waste heat source fluid outlet pipeline 32.

[0071] The use side flow pipeline can be a circulation pipeline, and the form and type of the fluid in the pipeline are not limited. After the high-temperature fluid flows out from the use side outlet pipeline 22, it is used, then flows into the use side inlet pipeline 21, is heated and used in circulation, and the efficiency of industrial and agricultural production is improved. Of course, according to the needs, it can also be a non-circulation pipeline, which is not described herein. Similarly, the waste heat source fluid pipeline 30 can also be a circulation pipeline, and the form and type of the fluid in the pipeline are not limited. After the low-temperature fluid flows out from the waste heat source fluid outlet pipeline 32, the low-temperature waste heat can be recycled, then flows into the waste heat source fluid inlet pipeline 31, and is used in circulation. Of course, according to the needs, it can also be a non-circulation pipeline, which is not described herein. In this embodiment, in order to introduce the waste heat source fluid only when the heat pump system is used, a first valve is further arranged between the second heat exchange side inlet of the evaporator 12 and the waste heat source fluid inlet pipeline 31.

[0072] In addition, the heat pump circulation unit 10 is a unit for heat exchange between the use side fluid and the waste heat source fluid in the heat pump system, and an independent compressor 13 is arranged in each heat pump circulation unit 10. The condenser 11 is used for heating the use side fluid, and the evaporator 12 is used for cooling the waste heat source fluid.

[0073] In the embodiment, the second heat exchange side of the evaporator 12 of the plurality of heat pump circulation units 10 is arranged in parallel, so that the evaporation temperature of the heat pump system is the same, the condensers 11 of the plurality of heat pump circulation units 10 are arranged in series, the temperature of the fluid on the use side is gradually increased, and finally the temperature of the fluid on the use side required by the user is reached, so that the condensation temperature of the previous stage heat pump circulation unit 10 is always lower than the condensation temperature of the adjacent next stage heat pump circulation unit 10, the condensation pressure of the previous stage heat pump circulation unit 10 can be obviously reduced, thereby effectively improving the overall efficiency of the heat pump system. Compared with the high-temperature heat pump driven by a single compressor 13, the heat pump system has sufficient heating capacity, compared with the heat pump system in which a plurality of compressors 13 are connected in parallel to drive the condenser 11 to increase the temperature of the fluid on the use side, the oil return is uniform, and the heat pump system has high efficiency, thereby providing a more energy-saving and environmentally-friendly technical solution for the high-temperature heating demand of industrial and agricultural production processes.

[0074] Please refer to Figures 1 to 8 In an embodiment of the present application, the heat pump circulation unit 10 further comprises an oil separator 14, an economizer 15 and an oil cooler 17.

[0075] The outlet of the compressor 13, the refrigerant separation side of the oil separator 14, the first heat exchange side of the condenser 11, the first heat exchange side of the economizer 15, the first throttling device 16-1, the first heat exchange side of the evaporator 12 and the inlet of the compressor 13 are connected in sequence to form a heat pump circulation main loop.

[0076] In this way, the heat pump circulation main loop can realize the circulation use of the refrigerant, the refrigerant is compressed by the compressor 13 into high-temperature and high-pressure refrigerant, then the lubricating oil is separated out by the oil separator 14, the refrigerant enters the first heat exchange side of the condenser 11 to exchange heat with the fluid on the use side to heat the fluid on the use side, then flows into the economizer 15 and is cooled and decompressed by the first throttling device 16-1, flows into the first heat exchange side of the evaporator 12 to exchange heat with the waste heat source fluid, and finally flows back to the compressor 13 to realize circulation.

[0077] In addition, the inlet of the first heat exchange side of the oil cooler 17 is connected with the lubricating oil separation side of the oil separator 14, and the outlet of the first heat exchange side of the oil cooler 17 is connected with the inlet of the compressor 13 to form a lubricating oil circulation loop.

[0078] The inlet of the second heat exchange side of the oil cooler 17 is connected with the waste heat source fluid pipeline 30, and the outlet of the second heat exchange side of the oil cooler 17 is connected with the second heat exchange side of the evaporator 12; specifically, the inlet of the second heat exchange side of the oil cooler 17 is connected with the waste heat source fluid inlet pipeline 31, and the outlet of the second heat exchange side of the oil cooler 17 is connected with the second heat exchange side inlet of the evaporator 12, so that the lubricating oil is cooled through heat exchange between the waste heat source fluid and the lubricating oil, and the heat exchanged waste heat source fluid can be further heat exchanged by the evaporator 12 to recycle the low-temperature waste heat. In the embodiment, a second valve is arranged between the inlet of the second heat exchange side of the oil cooler 17 and the waste heat source fluid inlet pipeline 31 to open the work in use.

[0079] Alternatively, the inlet of the second heat exchange side of the oil cooler 17 is connected with the outlet of the first throttling device 16-1, and the outlet of the second heat exchange side of the oil cooler 17 is connected with the inlet of the compressor 13; in this way, the lubricating oil is cooled through heat exchange between the refrigerant and the lubricating oil to realize circulation, and the heat exchanged refrigerant directly flows into the main loop of the heat pump cycle to realize circulation.

[0080] In this way, the temperature of the lubricating oil can be recycled, heat loss is avoided, oil return is uniform, and the overall operation efficiency of the heat pump system is improved.

[0081] Please refer to Figures 1 to 8 In addition, the heat pump cycle unit 10 further comprises a second throttling device 16-2.

[0082] The inlet of the second throttling device 16-2 is connected with the outlet of the first heat exchange side of the condenser 11, the outlet of the second throttling device 16-2 is connected with the inlet of the second heat exchange side of the economizer 15, and the outlet of the second heat exchange side of the economizer 15 is connected with the air supplement port of the compressor 13 to form an air supplement branch.

[0083] The refrigerant flowing out of the first heat exchange side of the condenser 11 is partially cooled and decompressed by the second throttling device 16-2, and then flows into the second heat exchange side of the economizer 15, and the other part directly flows into the first heat exchange side, the two parts are heat exchanged, the refrigerant flowing out of the first heat exchange side of the economizer 15 is further cooled, and the refrigerant flowing out of the second heat exchange side of the economizer 15 is warmed up to obtain medium-temperature and medium-pressure refrigerant, and enters the air supplement port of the compressor 13,

[0084] In this way, the exhaust temperature of the compressor 13 can be reduced, and the heating capacity of the heat pump cycle unit 10 can be improved.

[0085] In this embodiment, the compressor 13 is a compressor with a gas supplement function, and the compressor 13 can operate in a gas supplement mode and a non-gas supplement mode. When the temperature of the fluid on the use side is greater than a set value (for example, 110 DEG C), the first throttling device 16-1 and the second throttling device 16-2 work, and the compressor 13 of the heat pump circulation unit 10 operates in the gas supplement mode. When the temperature of the fluid on the use side is less than the set value (for example, 110 DEG C), the second throttling device 16-2 is completely closed, the first throttling device 16-1 works, and the compressor 13 of the heat pump circulation unit 10 operates in the non-gas supplement mode.

[0086] Please refer to Figures 1 to 4 In an embodiment of the present application, the heat pump circulation unit 10 further comprises a subcooler 18, and a first heat exchange side of the subcooler 18 is connected between the condenser 11 and the first throttling device 16-1.

[0087] The subcooler 18 can further cool the refrigerant, can effectively reduce the inlet temperature of the first throttling device 16-1 and the second throtting device 16-2, and can guarantee the reliability of the first throtting device 16-1 and the second throtting device 16-2 and improve the overall efficiency of the heat pump system.

[0088] In an embodiment, a second heat exchange side of the subcooler 18 is connected between the waste heat source fluid pipeline 30 and the inlet of the second heat exchange side of the oil cooler 17. Specifically, the inlet of the second heat exchange side of the subcooler 18 is connected with the waste heat source fluid inlet pipeline 31, the second valve is arranged between the inlet of the second heat exchange side of the subcooler 18 and the waste heat source fluid inlet pipeline 31, the outlet of the second heat exchange side of the subcooler 18 is connected with the inlet of the second heat exchange side of the oil cooler 17, and the refrigerant flowing out of the condenser 11 can first exchange heat with the waste heat source fluid to achieve cooling, which can effectively reduce the inlet temperature of the first throtting device 16-1 and the second throtting device 16-2, guarantee the reliability of the first throtting device 16-1 and the second throtting device 16-2, and improve the overall efficiency of the heat pump system. Of course, in another embodiment, the inlet of the second heat exchange side of the subcooler 18 is connected with the waste heat source fluid inlet pipeline 31, the outlet of the second heat exchange side of the subcooler 18 is connected with the second heat exchange side of the evaporator 12, the inlet of the second heat exchange side of the oil cooler 17 is connected with the waste heat source fluid pipeline 30, the outlet of the second heat exchange side of the oil cooler 17 is connected with the second heat exchange side of the evaporator 12, the second heat exchange side of the subcooler 18 and the second heat exchange side of the oil cooler 17 are arranged in parallel, and the inlet of the second heat exchange side of the subcooler 18 and the inlet of the second heat exchange side of the oil cooler 17 are respectively provided with corresponding valves.

[0089] In addition, the heat pump circulation unit 10 further comprises a regenerator 19, and a first heat exchange side of the regenerator 19 is connected between the condenser 11 and the first throtting device 16-1.

[0090] The second heat exchange side of the regenerator 19 is connected between the outlet of the first heat exchange side of the evaporator 12 and the inlet of the compressor 13.

[0091] The refrigerant before the throttling device can be further cooled by the regenerator 19, so that the inlet temperature of the first throttling device 16-1 and the second throttling device 16-2 is effectively reduced, the reliability of the first throttling device 16-1 and the second throttling device 16-2 is ensured, the inlet refrigerant temperature of the compressor 13 can be improved, liquid refrigerant entering the compressor 13 is avoided, liquid hammer phenomenon of the compressor 13 is avoided, and the overall reliability of the heat pump system is improved.

[0092] In the present application, the supercooler 18 and the regenerator 19 can be connected at the same time, the first heat exchange side of the supercooler 18, the regenerator 19 and the economizer 15 is arranged between the first heat exchange side of the condenser 18 and the first throttling device 16-1, and the arrangement position of the first heat exchange side of the supercooler 18, the regenerator 19 and the economizer 15 is not limited, that is, in the direction from the first heat exchange side of the condenser 18 to the first throttling device 16-1, the first heat exchange side of the supercooler 18, the regenerator 19 and the economizer 15 can be arranged in sequence, or the first heat exchange side of the economizer 15, the regenerator 19 and the supercooler 18 can be arranged in sequence, which will not be described in detail. Of course, in other embodiments, only the supercooler 18 or the regenerator 19 can be arranged, or the supercooler 18 and the regenerator 19 can not be arranged.

[0093] In addition, the heat pump cycle unit 10 further comprises a first dry filter and a second dry filter, the first dry filter is arranged at the inlet of the first throttling device 16-1, and the second dry filter is arranged at the inlet of the second throttling device 16-2. The impurities of the refrigerant flowing into the first throttling device 16-1 and the second throttling device 16-2 can be filtered through the first dry filter and the second dry filter, so as to avoid the problem of blockage of the throttling device, and improve the overall reliability of the heat pump.

[0094] In an embodiment of the present application, the first throttling device 16-1 comprises one of an electric regulating valve, an electronic expansion valve and a thermal expansion valve, and the second throttling device 16-2 comprises one of a throttling orifice plate, an electronic expansion valve, a thermal expansion valve and an electric regulating valve.

[0095] In addition, the heat pump cycle unit 10 further comprises a compressor 13 controller, a plurality of temperature parameter sensors and a plurality of pressure parameter sensors, the plurality of temperature parameter sensors are respectively arranged at the compressor 13, the first heat exchange side of the evaporator 12, the first heat exchange side of the condenser 11 and the inlet and outlet of the first throttling device 16-1, and the plurality of pressure parameter sensors are respectively arranged at the compressor 13, the first heat exchange side of the evaporator 12, the first heat exchange side of the condenser 11 and the inlet and outlet of the first throttling device 16-1, the compressor 13 controller is connected with the plurality of pressure parameter sensors and the plurality of temperature parameter sensors, so as to control the operation mode of the compressor 13 according to the temperature parameters detected by the plurality of temperature parameter sensors and the pressure parameters detected by the plurality of pressure parameter sensors.

[0096] In this way, the temperature and pressure of the refrigerant of each heat pump cycle unit 10 at each position can be monitored in real time, so as to determine the operation mode of the compressor 13, such as the aforementioned gas supplement mode and non-gas supplement mode, thereby improving the overall efficiency of the heat pump system.

[0097] On the basis of the foregoing structure of the supercooler 18, the regenerator 19 and the economizer 15, temperature parameter sensors and pressure parameter sensors can also be arranged at the inlet and outlet of the supercooler 18, the regenerator 19 and the economizer 15, so as to be monitored in real time.

[0098] In addition, temperature parameter sensors and pressure parameter sensors can also be arranged at the inlet and outlet of the second heat exchange side of the evaporator 12, the condenser 11, the supercooler 18, the regenerator 19 and the economizer 15, so as to realize comprehensive temperature and pressure parameter monitoring.

[0099] In addition, a high-pressure switch is arranged at the outlet of the compressor 13, and a low-pressure switch is arranged at the inlet of the compressor 13.

[0100] Please refer to Figures 1 to 8 In an embodiment of the present application, the use side inlet pipeline 21 is sequentially provided with a high-temperature fluid valve 23 and a high-temperature fluid storage tank 24, the upper portion of the high-temperature fluid storage tank 24 is connected with a use side steam pipeline, the lower portion of the high-temperature fluid storage tank 24 is connected with a use side liquid pipeline, and the use side steam pipeline is provided with a high-temperature fluid vapor compressor 25.

[0101] In this way, after the use side fluid is warmed, the high-temperature fluid can be divided into liquid and steam for use, which is convenient for the high-temperature heating demand of production processes in industrial and agricultural fields.

[0102] Based on the above embodiment, please refer to Figures 1 to 4In the first embodiment of the present application, the plurality of heat pump circulation units 10 are independent of each other, each of the heat pump circulation units 10 is provided with an independent compressor 13, a first throttling device 16-1, a condenser 11 and an evaporator 12, the second heat exchange sides of the plurality of condensers 11 are connected in series, and the second heat exchange sides of the evaporators 12 of the plurality of heat pump circulation units 10 are respectively connected to the waste heat source fluid pipeline 30 independently; in this embodiment, a subcooler 18 and a regenerator 19 are provided.

[0103] For reference, please see Figure 5 In the second embodiment, the plurality of heat pump circulation units 10 are independent of each other, each of the heat pump circulation units 10 is provided with an independent compressor 13, a first throttling device 16-1, a condenser 11 and an evaporator 12, the second heat exchange sides of the plurality of condensers 11 are connected in series, and the second heat exchange sides of the evaporators 12 of the plurality of heat pump circulation units 10 are respectively connected to the waste heat source fluid pipeline 30 independently; in this embodiment, no subcooler 18 and regenerator 19 are provided.

[0104] For reference, please see Figure 6 In the third embodiment, the plurality of heat pump circulation units 10 are independent of each other, each of the heat pump circulation units 10 is provided with an independent compressor 13, a first throttling device 16-1, a condenser 11 and an evaporator 12, the second heat exchange sides of the plurality of condensers 11 are connected in series, and the second heat exchange sides of the evaporators 12 of the plurality of heat pump circulation units 10 are respectively connected to the waste heat source fluid pipeline 30 independently; in this embodiment, only a subcooler 18 is provided.

[0105] For reference, please see Figures 7 to 11 In other embodiments, the heat pump system further comprises an integrated condenser 101, the first heat exchange sides of the condensers 11 of the plurality of heat pump circulation units 10 are arranged on the integrated condenser 101, the second heat exchange sides of the condensers 11 of the plurality of heat pump circulation units 10 are arranged in series and in the integrated condenser 101, the integrated condenser 101 has a use side high temperature fluid inlet 111 and a use side high temperature fluid outlet 112, the use side high temperature fluid inlet 111 is connected to the second heat exchange side inlet of the condenser 11 of the first heat pump circulation unit 10, the use side high temperature fluid outlet 112 is connected to the second heat exchange side outlet of the condenser 11 of the last heat pump circulation unit 10, the use side high temperature fluid inlet 111 is connected to the use side inlet pipeline 21, and the use side high temperature fluid outlet 112 is connected to the use side outlet pipeline 22.

[0106] In this way, the mutually independent compressors 13 provided in the plurality of heat pump circulation units 10 can share one integrated condenser 101, and the condensers 11 of the plurality of heat pump circulation units 10 are all shell-and-tube heat exchangers, which are integrated into one shell-and-tube condenser 11 through end covers in this embodiment, so that the size of the heat pump system is compact.

[0107] Similarly, the heat pump system also includes an integrated evaporator 102, the first heat exchange sides of the evaporators 12 of the plurality of heat pump circulation units 10 are all arranged on the integrated evaporator 102, the second heat exchange sides of the evaporators 12 of the plurality of heat pump circulation units 10 are arranged in parallel and are arranged in the integrated evaporator 102, the integrated evaporator 102 has a waste heat fluid inlet 121 and a waste heat fluid outlet 122, the waste heat fluid inlet 121 is connected to the second heat exchange side inlets of the evaporators 12 of the plurality of heat pump circulation units 10, the waste heat fluid outlet 122 is connected to the second heat exchange side outlets of the evaporators 12 of the plurality of heat pump circulation units 10, the waste heat fluid inlet 121 is connected to the waste heat source fluid inlet pipeline 31, and the waste heat fluid outlet 122 is connected to the waste heat source fluid outlet pipeline 32.

[0108] In this way, the mutually independent compressors 13 provided in the plurality of heat pump circulation units 10 can share one integrated evaporator 102, and the evaporators 12 of the plurality of heat pump circulation units 10 are all shell-and-tube heat exchangers, which are integrated into one shell-and-tube evaporator 12 through end covers in this embodiment, so that the size of the heat pump system is compact.

[0109] Please refer to Figure 7 Based on the above embodiment, in the fourth embodiment of the present application, two heat pump circulation units 10 are provided, the compressors 13 of the two heat pump circulation units 10 are independent of each other and share the integrated condenser 101 and the integrated evaporator 102, the fluid on the use side is water under pressure, and the fluid on the waste heat source side is water under normal pressure.

[0110] In this embodiment, in each heat pump circulation unit 10, the inlet of the second heat exchange side of the oil cooler 17 is connected to the waste heat source fluid inlet pipeline 31, and the outlet of the second heat exchange side of the oil cooler 17 is connected to the second heat exchange side inlet of the evaporator 12, so that the waste heat hot water flows through the oil cooler 17 to cool the high-temperature lubricating oil, and then mixes with the waste heat hot water and flows into the evaporator 12 to heat the heat pump working medium in the evaporator 12.

[0111] Please refer to Figure 9In this embodiment, a refrigerant inlet and a refrigerant outlet are arranged on the left side of the integrated condenser 101, a use-side high-temperature fluid inlet 111 and a use-side high-temperature fluid outlet 112 are arranged on the middle end head, and a refrigerant inlet and a refrigerant outlet are arranged on the right side of the integrated condenser 101. The left refrigerant inlet and outlet are connected to the first-stage heat pump circulation unit 10, the right refrigerant inlet and outlet are connected to the second-stage heat pump circulation unit 10, the refrigerants of the two-stage heat pump units are independent of each other in the flow channel of the integrated condenser 101, the high-temperature water flows in from the middle end position of the integrated condenser 101, exchanges heat with the refrigerant of the first-stage heat pump circulation unit 10 first, then enters the right side of the integrated condenser 101 through the middle end head channel, exchanges heat with the refrigerant of the second-stage heat pump circulation unit 10, and is heated to the required temperature before flowing out of the integrated condenser 101.

[0112] For reference Figure 10 The left side of the integrated evaporator 102 is arranged with a refrigerant inlet and a refrigerant outlet, the middle end head is arranged with a waste heat fluid inlet 121 and a waste heat fluid outlet 122, and the right side of the integrated evaporator 102 is arranged with a refrigerant inlet and a refrigerant outlet. The left refrigerant inlet and outlet are connected to the first-stage heat pump circulation unit 10, the right refrigerant inlet and outlet are connected to the second-stage heat pump circulation unit 10, the refrigerants of the two-stage heat pump units are independent of each other in the flow channel of the integrated evaporator 102, the waste heat hot water flows in from the middle end position of the shell, simultaneously flows into the left side and the right side of the integrated evaporator 102 through the middle end head channel, exchanges heat with the refrigerants of the first-stage heat pump circulation unit 10 and the second heat pump circulation unit 10 respectively, and then flows out of the integrated evaporator 102 through the middle end head channel.

[0113] For reference Figure 11 The pressure of the two heat pump circulation units 10 is increased, that is, the pressure difference of the heat pump required to be increased by the heat pump corresponding to the temperature of the waste heat water source (evaporation temperature) and the temperature of the use-side high-temperature water (condensation temperature). As can be seen from the figure, compared with the second-stage heat pump circulation unit 10, the heat pump system using the present application can significantly reduce the condensation pressure of the first-stage heat pump circulation unit 10 in the first-stage heat pump circulation unit 10, thereby effectively improving the overall efficiency of the heat pump system, and realizing the heat superposition effect of the heat pump system driven by the compressors 13 of the two heat pump circulation units 10, thereby meeting the demand for super-large heat capacity heat pumps in industrial production.

[0114] For reference Figure 8In addition, in the fifth embodiment, two heat pump cycle units 10 are provided, the compressors 13 of the two heat pump cycle units 10 are independent of each other, and share the integrated condenser 101 and the integrated evaporator 102; the fluid on the use side is pressurized water, and the fluid on the waste heat source side is atmospheric water.

[0115] In the embodiment, in each heat pump cycle unit 10, the inlet of the second heat exchange side of the oil cooler 17 is connected with the outlet of the first throttling device 16-1, and the outlet of the second heat exchange side of the oil cooler 17 is connected with the inlet of the compressor 13; the heat pump working medium throttled by the heat pump cycle main circuit flows through the oil cooler 17 to cool the lubricating oil, and is mixed with the heat pump working medium flowing out of the evaporator 12 to flow into the suction inlet of the compressor 13.

[0116] The specific structure of the integrated condenser 101 and the integrated evaporator 102 in the embodiment can refer to the fourth embodiment, and will not be described here.

[0117] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A heat pump system, characterized in that, include: The use-side fluid piping includes a use-side inlet pipe and a use-side outlet pipe; Waste heat source fluid pipeline, wherein the waste heat source fluid pipeline includes a waste heat source fluid inlet pipeline and a waste heat source fluid outlet pipeline; Multiple heat pump cycle units are provided, each including a condenser, an evaporator, a first throttling device, and a compressor. The first heat exchange side of the condenser, the first heat exchange side of the evaporator, the first throttling device, and the compressor are connected to the main heat pump cycle loop. The multiple heat pump cycle units are independent of each other. The second heat exchange sides of the condensers of the multiple heat pump cycle units are connected in series. The inlet of the second heat exchange side of the condenser of the first heat pump cycle unit is connected to the inlet pipe of the user side, and the outlet of the second heat exchange side of the condenser of the last heat pump cycle unit is connected to the outlet pipe of the user side. The inlet of the second heat exchange side of the evaporator of each heat pump cycle unit is connected to the inlet pipe of the waste heat source fluid, and the outlet of the second heat exchange side of the evaporator of each heat pump cycle unit is connected to the outlet pipe of the waste heat source fluid. The heat pump cycle unit further includes an oil separator, an economizer, and an oil cooler; the compressor outlet, the refrigerant separation side of the oil separator, the first heat exchange side of the condenser, the first heat exchange side of the economizer, the first throttling device, the first heat exchange side of the evaporator, and the compressor inlet are connected in sequence to form the main heat pump cycle loop; the inlet of the first heat exchange side of the oil cooler is connected to the lubricating oil separation side of the oil separator, and the outlet of the first heat exchange side of the oil cooler is connected to the compressor inlet to form a lubricating oil circulation loop; the inlet of the second heat exchange side of the oil cooler is connected to the waste heat source fluid pipeline, and the outlet of the second heat exchange side of the oil cooler is connected to the second heat exchange side of the evaporator; or, the inlet of the second heat exchange side of the oil cooler is connected to the outlet of the first throttling device, and the outlet of the second heat exchange side of the oil cooler is connected to the compressor inlet; The heat pump cycle unit further includes a second throttling device; the inlet of the second throttling device is connected to the outlet of the first heat exchange side of the condenser, the outlet of the second throttling device is connected to the inlet of the second heat exchange side of the economizer, and the outlet of the second heat exchange side of the economizer is connected to the gas supply port of the compressor, forming a gas supply branch. The heat pump cycle unit further includes a subcooler, the first heat exchange side of which is connected between the condenser and the first throttling device; the heat pump cycle unit further includes a regenerator, the first heat exchange side of which is connected between the condenser and the first throttling device; the second heat exchange side of which is connected between the outlet of the first heat exchange side of the evaporator and the inlet of the compressor.

2. The heat pump system according to claim 1, characterized in that, The first throttling device includes one of an electric regulating valve, an electronic expansion valve, and a thermostatic expansion valve; the second throttling device includes one of a throttling orifice plate, an electronic expansion valve, a thermostatic expansion valve, and an electric regulating valve.

3. The heat pump system according to claim 1, characterized in that, The heat pump cycle unit also includes a compressor controller, multiple temperature parameter sensors, and multiple pressure parameter sensors. The multiple temperature parameter sensors are respectively located on the compressor, the first heat exchange side of the evaporator, the first heat exchange side of the condenser, and the inlet and outlet of the first throttling device. The multiple pressure parameter sensors are respectively located on the compressor, the first heat exchange side of the evaporator, the first heat exchange side of the condenser, and the inlet and outlet of the first throttling device. The compressor controller is connected to the multiple pressure parameter sensors and the multiple temperature parameter sensors to control the operating mode of the compressor based on the temperature parameters detected by the multiple temperature parameter sensors and the pressure parameters detected by the multiple pressure parameter sensors.

4. The heat pump system according to claim 1, characterized in that, A high-temperature fluid valve and a high-temperature fluid storage tank are sequentially installed on the inlet pipe on the user side. A steam pipe on the user side is connected above the high-temperature fluid storage tank, and a liquid pipe on the user side is connected below the high-temperature fluid storage tank. A high-temperature fluid steam compressor is installed on the steam pipe on the user side.

5. The heat pump system according to claim 1, characterized in that, The heat pump system also includes an integrated condenser. The first heat exchange side of the condensers of the multiple heat pump circulation units is located on the integrated condenser. The second heat exchange sides of the condensers of the multiple heat pump circulation units are arranged in series and located within the integrated condenser. The integrated condenser has a high-temperature fluid inlet on the user side and a high-temperature fluid outlet on the user side. The high-temperature fluid inlet on the user side is connected to the second heat exchange side inlet of the condenser of the first heat pump circulation unit. The high-temperature fluid outlet on the user side is connected to the second heat exchange side outlet of the condenser of the last heat pump circulation unit. The high-temperature fluid inlet on the user side is connected to the user side inlet pipe, and the high-temperature fluid outlet on the user side is connected to the user side outlet pipe.

6. The heat pump system according to claim 1, characterized in that, The heat pump system further includes an integrated evaporator. The first heat exchange side of the evaporators of the multiple heat pump circulation units is located on the integrated evaporator. The second heat exchange side of the evaporators of the multiple heat pump circulation units is arranged in parallel and located within the integrated evaporator. The integrated evaporator has a waste heat fluid inlet and a waste heat fluid outlet. The waste heat fluid inlet is connected to the second heat exchange side inlet of the evaporators of the multiple heat pump circulation units. The waste heat fluid outlet is connected to the second heat exchange side outlet of the evaporators of the multiple heat pump circulation units. The waste heat fluid inlet is connected to the waste heat source fluid inlet pipeline, and the waste heat fluid outlet is connected to the waste heat source fluid outlet pipeline.

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