Heat pump system and control method of heat pump system

Abstract

The invention provides a heat pump system and a control method of the heat pump system, the heat pump system is used for increasing the temperature of fluid in a water supply system, the heat pump system comprises a first loop system, the first loop system comprises a first compressor, a first heat exchange part, an air supply assembly, an injection assembly and a second heat exchange part, and the first compressor comprises an air supply opening; an inlet of the first heat exchange piece communicates with an outlet of the first compressor, an inlet of the air supplementing assembly communicates with an outlet of the first heat exchange piece, an outlet of the air supplementing assembly comprises a first outlet end and a second outlet end, and the first outlet end communicates with the air supplementing opening. An inlet of the injection assembly comprises a first inlet end and a second inlet end, an outlet of the injection assembly comprises a gas outlet end and a liquid outlet end, the first inlet end communicates with the second outlet end, the gas outlet end communicates with an inlet of the first compressor, and an inlet of the second heat exchange piece communicates with the liquid inlet end. An inlet of the second heat exchange piece communicates with the second inlet end.

Description

Technical Field

[0001] The present application relates to the field of thermal management technology, and in particular to a heat pump system and a control method for the heat pump system. Background Art

[0002] The heat pump system is a device that efficiently utilizes low-grade external heat energy. It transfers heat from low-temperature objects to high-temperature objects through a reverse cycle, consuming only a small amount of electricity to achieve a large amount of heating. Compared with the traditional coal-fired system, it has a significant energy-saving effect, and can automatically adjust the heating temperature according to the ambient temperature, with good comfort and environmental protection. Summary of the invention

[0003] The embodiments of the present application provide a heat pump system and a control method for the heat pump system, which can improve the performance of the heat pump system.

[0004] The embodiment of the present application provides a heat pump system, which is used to increase the temperature of the fluid in the water supply system. The heat pump system includes a first circuit system, which includes a first compressor, a first heat exchanger, an air supply assembly, an injection assembly, and a second heat exchanger. The first compressor includes an air supply port, the inlet of the first heat exchanger is connected to the outlet of the first compressor, the inlet of the air supply assembly is connected to the outlet of the first heat exchanger, the outlet of the air supply assembly includes a first outlet end and a second outlet end, and the first outlet end is connected to the air supply port. The inlet of the injection assembly includes a first inlet end and a second inlet end, the outlet of the injection assembly includes a gas outlet end and a liquid outlet end, the first inlet end is connected to the second outlet end, the gas outlet end is connected to the inlet of the first compressor, the inlet of the second heat exchanger is connected to the liquid inlet end, and the inlet of the second heat exchanger is connected to the second inlet end.

[0005] In some embodiments, the air supply assembly includes a third heat exchange element and a first throttling element, the third heat exchange element includes a first heat exchange channel and a second heat exchange channel for realizing a heat exchange function, the outlet of the first heat exchange channel is connected to the first inlet end, and the second heat exchange channel is connected between the outlet of the first throttling element and the air supply port;

[0006] The inlet of the first throttling element and the inlet of the first heat exchange channel are connected in parallel to the outlet of the first heat exchange element.

[0007] In some embodiments, the injection assembly includes an injector and a first gas-liquid separator, the inlet of the injector includes a first sub-inlet connected to the first inlet end and a second sub-inlet connected to the second inlet end, and the outlet of the injector is connected to the inlet of the first gas-liquid separator;

[0008] Wherein, the first gas-liquid separator includes a gas outlet end and a liquid outlet end.

[0009] In some embodiments, the injection assembly further includes a first control member, and the number of the injectors and the first control member are both multiple and correspondingly arranged;

[0010] The inlets of the multiple first control members are connected in parallel to the first inlet end, the outlets of the first control members are connected to the first sub-inlet of the corresponding ejector, the multiple second sub-inlet are connected in parallel to the second inlet end, and the outlets of the multiple ejectors are connected in parallel to the inlet of the first gas-liquid separator.

[0011] In some embodiments, a first heat recovery component is also included, which includes a third heat exchange channel and a fourth heat exchange channel for realizing the heat exchange function. The third heat exchange channel is connected between the second outlet end and the first inlet end, and the fourth heat exchange channel is connected between the inlet end and the gas outlet end of the first compressor.

[0012] In some embodiments, the first circuit system further includes a second throttling element connected between the liquid outlet and the inlet of the second heat exchange element.

[0013] In some embodiments, the first circuit system also includes a defrost branch and a second control component arranged on the defrost branch, the inlet of the defrost branch is connected between the compressor outlet and the inlet of the first heat exchanger, and the outlet of the defrost branch is connected between the liquid outlet end and the inlet of the second heat exchanger.

[0014] In some embodiments, the heat pump system further comprises a second loop system, wherein the first loop system and the second loop system are used for providing flow of different fluids;

[0015] Among them, the second circuit system includes a second compressor, a fourth heat exchanger, a third throttling element and a first heat exchanger which are connected in sequence. The first circuit system and the second circuit system realize heat exchange through the first heat exchanger, and the second circuit system and the water supply system realize heat exchange through the fourth heat exchanger.

[0016] In the second aspect, the embodiment of the present application provides a control method for a heat pump system, wherein the heat pump system includes a first circuit system and a second circuit system, wherein the first circuit system includes a first compressor, a first heat exchanger, an air supply assembly, an injection assembly, and a second heat exchanger, wherein the first compressor includes an air supply port, the inlet of the first heat exchanger is connected to the outlet of the first compressor, the inlet of the air supply assembly is connected to the outlet of the first heat exchanger, the outlet of the air supply assembly includes a first outlet end and a second outlet end, and the first outlet end is connected to the air supply port. The inlet of the injection assembly includes a first inlet end and a second inlet end, the outlet of the injection assembly includes a gas outlet end and a liquid outlet end, the first inlet end is connected to the second outlet end, the gas outlet end is connected to the inlet of the first compressor, the inlet of the second heat exchanger is connected to the liquid inlet end, and the inlet of the second heat exchanger is connected to the second inlet end.

[0017] The second circuit system includes a second compressor, a fourth heat exchanger, a third throttling element and a first heat exchanger which are connected in sequence. The first circuit system and the second circuit system realize heat exchange through the first heat exchanger, and the second circuit system and the water supply system realize heat exchange through the fourth heat exchanger. The control method of the heat pump system includes:

[0018] Determine the optimal condensing temperature of the first loop system based on the temperature of the external environment and the inlet and outlet temperatures of the water supply system;

[0019] adjusting at least one of the injection assembly and the air supplement assembly based on the optimal condensing temperature and the superheat of the second heat exchange element;

[0020] Based on the optimum condensing temperature, the opening of the third throttle element is adjusted.

[0021] In some embodiments, the injection assembly includes a plurality of injectors arranged in parallel, and based on the optimal condensing temperature and the superheat of the second heat exchange element, adjusting at least one of the injection assembly and the air supplement assembly includes:

[0022] determining a degree of superheat based on an outlet temperature of the second heat exchange element;

[0023] Based on the superheat, adjusting the opening quantity of the plurality of injectors;

[0024] Based on the optimum condensing pressure, determine the condensing pressure and evaporation pressure of the first loop system at the optimum condensing temperature;

[0025] Based on the condensing pressure and evaporating pressure of the first loop system at the optimum condensing temperature, the air supply volume and air supply pressure of the air supply component are adjusted.

[0026] In some embodiments, in adjusting the opening number of the plurality of injectors based on the superheat,

[0027] When the superheat is greater than the preset superheat, the opening quantity of the ejector is reduced;

[0028] When the superheat is less than the preset superheat, the opening number of the injector is increased.

[0029] In some embodiments, the air supply amount of the air supply component is adjusted based on the condensing pressure and evaporation pressure of the first loop system at the optimal condensing temperature.

[0030] When the exhaust temperature of the first compressor is greater than the preset exhaust temperature, increasing the air supply volume of the air supply component;

[0031] When the temperature of the external environment is lower than the preset ambient temperature, the air supply volume of the air supply component is increased.

[0032] In some embodiments, in adjusting at least one of the injection assembly and the air supplement assembly based on the optimal condensing temperature and the superheat of the second heat exchange element,

[0033] When the temperature of the external environment decreases or the load in the water supply system increases, the number of ejectors opened and the amount of air supplied by the air supply assembly are increased in sequence;

[0034] When the temperature of the external environment increases or the load in the water supply system decreases, the air supply amount of the air supply component and the number of ejectors opened are reduced in turn.

[0035] In some embodiments, adjusting the opening number of the plurality of injectors based on the superheat includes:

[0036] Based on the change in the corresponding opening amount of the injector, the opening degree of the third throttle element is adjusted.

[0037] The embodiment of the present application provides a heat pump system and a control method for the heat pump system. The setting of the air replenishment component can enable the first compressor to absorb the air replenishment gas at the intermediate pressure, thereby reducing the influence of the large compression ratio on the first compressor and lowering the exhaust temperature of the first compressor. The setting of the injection component can increase the fluid pressure before entering the first compressor, thereby fully recovering the expansion work. On this basis, the injection component can also play an auxiliary role in enhancing the air replenishment effect of the air replenishment component, thereby further reducing the overall power consumption of the first compressor and improving the overall performance of the heat pump system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0039] Figure 1 is a structural schematic diagram of a heat pump system provided in an embodiment of the present application;

[0040] Figure 2 is a structural schematic diagram of another heat pump system provided in an embodiment of the present application;

[0041] Figure 3 is a structural schematic diagram of another heat pump system provided in an embodiment of the present application;

[0042] Figure 4 is a structural schematic diagram of another heat pump system provided in an embodiment of the present application;

[0043] Figure 5 is a flow chart of a control method of a heat pump system provided in an embodiment of the present application;

[0044] Figure 6This is a flow chart of another method for controlling a heat pump system provided in an embodiment of the present application.

[0045] Marking Description:

[0046] 100, first loop system; 200, second loop system; 300, water supply system;

[0047] 11. first compressor; 111. air supply port; 12. second compressor;

[0048] 21. first heat exchange element; 22. second heat exchange element; 23. fourth heat exchange element;

[0049] 30. injection assembly; 31. first inlet end; 32. second inlet end; 33. gas outlet end; 34. liquid outlet end; 35. injector; 351. first sub-inlet; 352. second sub-inlet; 36. first gas-liquid separator;

[0050] 40. air supply component; 41. first outlet port; 42. second outlet port; 43. third heat exchange component; 44. first throttling component;

[0051] 51. First control element; 52. Second throttling element; 53. Second control element; 54. Third throttling element; 55. Regenerative regulating valve;

[0052] 61. first heat recovery component; 62. second heat recovery component;

[0053] 70. Defrost branch;

[0054] 81. First oil-gas separator; 82. First oil storage tank; 83. First drying filter; 84. Ball valve; 85. Second gas-liquid separator; 86. Second oil-gas separator; 87. Second drying filter. DETAILED DESCRIPTION

[0055] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0056] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0057] In a heat pump system, the throttling loss caused by a large pressure difference often limits the performance improvement of the heat pump system, and the loop system that directly exchanges heat with the external environment often has a lower evaporation temperature, which also poses a great challenge to the performance of the compressor.

[0058] Regarding the above issues, please refer to Figure 1 The embodiment of the present application provides a heat pump system, which is used to increase the fluid temperature in the water supply system 300. The heat pump system includes a first loop system 100, and the first loop system 100 includes a first compressor 11, a first heat exchanger 21, an air supply component 40, an injection component 30 and a second heat exchanger 22. The first compressor 11 includes an air supply port 111, the inlet of the first heat exchanger 21 is connected to the outlet of the first compressor 11, the inlet of the air supply component 40 is connected to the outlet of the first heat exchanger 21, and the outlet of the air supply component 40 includes a first outlet port 41 and a second outlet port 42, and the first outlet port 41 is connected to the air supply port 111. The inlet of the injection assembly 30 includes a first inlet end 31 and a second inlet end 32, and the outlet of the injection assembly 30 includes a gas outlet end 33 and a liquid outlet end 34. The first inlet end 31 is connected to the second outlet end 42, the gas outlet end 33 is connected to the inlet of the first compressor 11, the inlet of the second heat exchange element 22 is connected to the liquid inlet end, and the inlet of the second heat exchange element 22 is connected to the second inlet end 32.

[0059] The heat pump system is an energy-saving device that uses high-level energy (such as electrical energy) to drive and transfer the heat energy of a low-level heat source to a high-level heat source. The high-level heat source mentioned here refers to the fluid in the water supply system 300, that is, the coolant (such as water). The heat pump system can increase the temperature of the fluid in the water supply system 300 to achieve the purpose of heating. Optionally, the heat pump system provided in the embodiment of the present application can be an air source heat pump system, that is, the heat pump system can absorb heat from the external air environment to heat the fluid in the water supply system 300, and then the heated fluid in the water supply system 300 is transferred to the heat user to meet the needs of heating.

[0060] The first loop system 100 is a loop system in the heat pump system for heat exchange with the external environment, and the heat pump system can absorb heat from the external air environment with the help of the first loop system 100. Among them, the embodiment of the present application does not limit the number of specific loop systems in the heat pump system. Exemplarily, the heat pump system may only include the first loop system 100. In this case, the first loop system 100 needs to exchange heat with the water supply system 300. Or the heat pump system may also include a second loop system 200 for heat exchange with the first loop system 100, and the second loop system 200 needs to exchange heat with the water supply system 300. In this case, the first loop system 100 and the second loop system 200 can together form a cascade system.

[0061] The first loop system 100 includes a pipeline structure and a plurality of functional components, wherein the pipeline structure is connected to the functional components to meet the conduction requirements between different functional components, and during the operation of the first loop system 100, the pipeline structure and the plurality of functional components can together form a loop system for circulating a fluid, wherein the fluid mentioned here is a refrigerant.

[0062] Optionally, the fluid in the first loop system 100 may be carbon dioxide, that is, the heat pump system may be a transcritical carbon dioxide heat pump system. Based on the unique physical properties of carbon dioxide, it has excellent corrosion resistance and low viscosity at high temperature and high pressure. In addition, it has a smaller volume, lighter weight, and higher power generation efficiency under the same installed capacity, and can help reduce carbon emissions. Therefore, it has the advantages of high efficiency and flexibility, and has great potential in the field of heating.

[0063] Next, the embodiment of the present application will describe and introduce the specific structure of the first loop system 100.

[0064] The first compressor 11, the first heat exchanger 21, the air supply assembly 40, the injection assembly 30 and the second heat exchanger 22 are all functional components in the first loop system 100. The first compressor 11 is a driven fluid machinery that boosts low-pressure gas to high-pressure gas. In addition to the inlet and outlet, the first compressor 11 also includes an air supply port 111, that is, the first compressor 11 is a single-machine two-stage compressor, and its working principle is that the low-pressure gas is first converted into medium-pressure gas through the front-stage compression, and then enters the rear-stage compression, and finally outputs high-pressure gas.

[0065] The first heat exchanger 21 is a component that acts as a condenser in the first loop system 100. Taking the heat pump system including the first loop system 100 and the second loop system 200 as an example, the first heat exchanger 21 is used to realize heat exchange between the first loop system 100 and the second loop system 200. Specifically, the first heat exchanger 21 includes a fifth heat exchange channel and a sixth heat exchange channel that realize the heat exchange function. The fifth heat exchange channel is used to flow the fluid (such as carbon dioxide) in the first loop system 100, and the sixth heat exchange channel is used to flow the fluid (such as R134a, i.e., 1,1,1,2-tetrafluoroethane) in the second loop system 200. On this basis, the inlet of the first heat exchanger 21 mentioned in the embodiment of the present application refers to the inlet of the fifth heat exchange channel, and the outlet of the first heat exchanger 21 refers to the outlet of the fifth heat exchange channel.

[0066] The air replenishment component 40 is a functional component used to achieve the air replenishment effect in the first loop system 100. The outlet of the air replenishment component 40 includes a first outlet port 41 and a second outlet port 42. The second outlet port 42 is correspondingly located on the main loop of the first loop system 100, and the first outlet port 41 is connected to the air replenishment port 111 of the first compressor 11 through a pipeline structure. On this basis, the fluid leaving the first heat exchanger 21 will be split at the air replenishment component 40, one part of which enters the injection component 30, and the other part enters the first compressor 11 through the air replenishment port 111, and converges with the medium-pressure gas after the previous stage compression in the first compressor 11, and is compressed in the second stage together in the first compressor 11, and finally outputs high-pressure gas.

[0067] Furthermore, since the temperature of the supplementary gas entering the first compressor 11 is often lower than the temperature of the intermediate-pressure gas after compression in the previous stage, this design can enable the first compressor 11 to absorb the supplementary gas at the intermediate pressure, thereby reducing the impact of the large compression ratio on the first compressor 11, and also help to reduce the exhaust temperature of the first compressor 11, thereby reducing the load of the first compressor 11 under a large pressure difference and improving the performance of the first compressor 11.

[0068] It should be noted that the embodiment of the present application does not limit the specific structural form of the air supply component 40. On this basis, according to the different structures of the air supply component 40, the fluid can be diverted inside the air supply component 40, or the fluid can also be diverted before the inlet of the air supply component 40, that is, between the air supply component 40 and the first heat exchanger 21. The embodiment of the present application also does not limit this, as long as the fluid leaving the air supply component 40 can enter the first compressor 11 and the injection component 30 respectively.

[0069] The injection assembly 30 is a functional component that uses the high-pressure mainstream as a power source to transport the low-pressure secondary flow. The inlet of the injection assembly 30 includes a first inlet end 31 and a second inlet end 32. The first inlet end 31 is the high-pressure inlet of the injection assembly 30. Part of the fluid leaving the air supply assembly 40 enters the injection assembly 30 as the high-pressure mainstream via the first inlet end 31. The second inlet end 32 is the low-pressure inlet of the injection assembly 30. The fluid leaving the second heat exchange element 22 enters the injection assembly 30 as the low-pressure secondary flow via the second inlet end 32.

[0070] After that, the low-pressure secondary flow is ejected under the action of the high-pressure mainstream, and then the gaseous fluid after the ejection is completed will leave the injection assembly 30 through the gas outlet port 33, and the liquid fluid will leave the injection assembly 30 through the liquid outlet port 34. Further, the gaseous fluid leaving from the gas outlet port 33 will enter the first compressor 11, so as to meet the operation needs of the first compressor 11 and the circulation needs of the first loop system 100. The liquid fluid leaving from the liquid outlet port 34 will enter the second heat exchanger 22 and exchange heat with the external environment. In this process, the second heat exchanger 22 acts as an evaporator, and the fluid in the first loop system 100 absorbs part of the heat in the external environment space with the help of the second heat exchanger 22, thereby realizing the heat energy absorption of the low-level heat source.

[0071] The setting of the injection assembly 30 can establish an effective power recovery path between the high-pressure fluid and the low-pressure fluid, thereby improving the overall performance of the heat pump system. Specifically, if the heat pump system replaces the injection assembly 30 with a throttle valve, the outlet of the throttle valve is connected to the inlet of the second heat exchanger 22, and the outlet of the second heat exchanger 22 is connected to the inlet of the first compressor 11. In this case, the pressure of the fluid entering the inlet of the first compressor 11 often depends on the pressure of the fluid at the outlet of the second heat exchanger 22.

[0072] However, in the embodiment of the present application, the injection assembly 30 can also play a throttling effect, and unlike the throttle valve, the outlet of the second heat exchanger 22 is not directly connected to the inlet of the first compressor 11, but is connected to the second inlet end 32. On this basis, the pressure of the fluid entering the inlet of the first compressor 11 often depends on the fluid pressure at the gas outlet end 33 of the injection assembly 30, and the corresponding low-pressure fluid at the outlet of the second heat exchanger 22 will be diverted and pressurized by the injection assembly 30, so that the fluid pressure at the outlet of the injection assembly 30 is greater than the fluid pressure at the outlet of the second heat exchanger 22, and then the fluid pressure is increased before entering the first compressor 11, so as to fully recover the expansion work with the help of the injection assembly 30, reduce the overall power consumption of the first compressor 11, and improve the overall performance of the heat pump system.

[0073] In addition, the injection assembly 30 and the air supply assembly 40 provided in the embodiment of the present application also have a coupling relationship. Specifically, the gaseous fluid leaving the injection assembly 30 will enter the first compressor 11, and converge with the air supply gas entering the air supply port 111 after the previous stage compression. On this basis, since the existence of the injection assembly 30 can boost the fluid before entering the first compressor 11, the boosted fluid can assist the air supply gas to enter the first compressor 11 more easily, further reducing the exhaust temperature of the first compressor 11, thereby further reducing the overall power consumption of the first compressor 11 and improving the overall performance of the heat pump system.

[0074] In summary, in the embodiment of the present application, the setting of the air replenishment component 40 can make the first compressor 11 absorb the air replenishment gas at the intermediate pressure, thereby reducing the impact of the large compression ratio on the first compressor 11 and reducing the exhaust temperature of the first compressor 11. The setting of the injection component 30 can increase the fluid pressure before entering the first compressor 11, thereby fully recovering the expansion work. On this basis, the injection component 30 can also play an auxiliary role in enhancing the air replenishment effect of the air replenishment component 40, thereby further reducing the overall power consumption of the first compressor 11 and improving the overall performance of the heat pump system.

[0075] It should be noted that, in addition to the above-mentioned functional components, the heat pump system may also be provided with other component structures. The embodiment of the present application does not limit the specific composition of the heat pump system, as long as the heat pump system includes at least a first compressor 11, a first heat exchanger 21, an air supply component 40, an injection component 30 and a second heat exchanger 22, and these functional components can be laid out and designed according to the above contents.

[0076] In addition, the "connection" mentioned in the embodiments of the present application means that, for two components, the inlet of one component is connected to the outlet of the other component through a pipeline structure, but it does not constitute a limitation that the two components are adjacent components. For example, taking the inlet of the first heat exchanger 21 being connected to the outlet of the first compressor 11 as an example, the "connection" mentioned here means that the inlet of the first heat exchanger 21 is connected to the outlet of the first compressor 11 through a pipeline structure, and according to different actual needs, the pipeline structure used to connect the inlet of the first heat exchanger 21 and the outlet of the first compressor 11 may be selected without other functional components, in which case the first heat exchanger 21 and the first compressor 11 are adjacent components. Alternatively, other functional components may be selected on the pipeline structure, for example, a control switch such as a valve may be provided, or a detection element such as a thermometer and a pressure gauge may be provided, or other functional components such as an oil-gas separator may be provided, in which case the first heat exchanger 21 and the first compressor 11 are not adjacent components. The "connection" mentioned in other embodiments of the present application is the same, and will not be repeated later.

[0077] In some embodiments, see Figure 2 The air supply component 40 includes a third heat exchange component 43 and a first throttling component 44. The third heat exchange component 43 includes a first heat exchange channel and a second heat exchange channel for realizing a heat exchange function. The outlet of the first heat exchange channel is connected to the first inlet end 31, and the second heat exchange channel is connected between the outlet of the first throttling component 44 and the air supply port 111. The inlet of the first throttling component 44 and the inlet of the first heat exchange channel are connected in parallel to the outlet of the first heat exchange component 21.

[0078] Similar to the first heat exchanger 21 and the second heat exchanger 22, the third heat exchanger 43 is also a component that performs heat exchange function, but the difference is that the two heat exchange channels in the first heat exchanger 21 are used for the flow of fluids of different material media, the second heat exchanger 22 is used for heat exchange with the external environment, and the fluids in the two heat exchange channels in the third heat exchanger 43 are the same material medium.

[0079] The first throttle 44 is a functional component that plays a throttling role. Optionally, the first throttle 44 includes an electronic expansion valve. The outlet of the first throttle 44 is connected to the inlet of the second heat exchange flow channel, that is, the first throttle 44 can play a throttling effect on the fluid entering the second heat exchange flow channel. Specifically, the fluid leaving the first heat exchanger 21 will be split, a part of the fluid will enter the first heat exchange flow channel, and a part of the fluid will enter the first throttle 44 for throttling, and then the throttled fluid will enter the second heat exchange flow channel and perform heat exchange with the fluid in the first heat exchange flow channel. In this process, the fluid in the second heat exchange flow channel will absorb the heat of the fluid in the first heat exchange flow channel, and then the fluid that absorbs heat and leaves the second heat exchange flow channel will enter the first compressor 11 through the air supply port 111, and the fluid that cools down and leaves the first heat exchange flow channel will enter the air supply component 40 through the first inlet end 31.

[0080] In the embodiment of the present application, the air supply component 40 is configured to include a third heat exchange element 43 and a first throttling element 44, so that while meeting different air supply needs, the temperature of the fluid entering the air supply component 40 can also be reduced, thereby increasing the fluid temperature difference between the outlet of the first compressor 11 and the first inlet end 31, thereby improving the condensing efficiency of the first loop system 100.

[0081] Furthermore, the opening degree of the first throttle member 44 is positively correlated with the air supply volume of the first compressor 11. On this basis, according to the change of the exhaust temperature of the first compressor 11, the opening degree of the first throttle member 44 can be adjusted accordingly to change the air supply volume of the first compressor 11, thereby realizing the regulation and control of the exhaust temperature of the first compressor 11 and improving the overall performance and stability of the heat pump system.

[0082] In addition to adjusting the amount of supplementary air, the first throttle 44 can also adjust the supplementary air pressure so that the heat pump system can be in the best operating state. Specifically, the required supplementary air pressure of the first compressor 11 needs to be calculated based on the condensing pressure and the evaporation pressure of the first loop system 100, and the control system of the heat pump system can adjust the opening of the first throttle 44 according to the calculated required supplementary air pressure, so that the actual supplementary air pressure can be the same as or close to the required supplementary air pressure, thereby improving the operating performance of the heat pump system.

[0083] In some embodiments, Figure 2 As shown, the injection assembly 30 includes an injector 35 and a first gas-liquid separator 36, the inlet of the injector 35 includes a first sub-inlet 351 connected to the first inlet end 31 and a second sub-inlet 352 connected to the second inlet end 32, and the outlet of the injector 35 is connected to the inlet of the first gas-liquid separator 36. The first gas-liquid separator 36 includes a gas outlet end 33 and a liquid outlet end 34.

[0084] The ejector 35 is a core component of the ejector assembly 30. The ejector 35 is a fluid power pump without mechanical transmission and mechanical working components. The inlet of the ejector 35 includes a first sub-inlet 351 and a second sub-inlet 352. The first sub-inlet 351 is a high-pressure inlet of the ejector 35. The high-pressure main flow enters the ejector 35 through the first sub-inlet 351. The second sub-inlet 352 is a low-pressure inlet of the ejector 35. The low-pressure secondary flow enters the fire sub-injector 35 through the second sub-inlet 352.

[0085] It should be noted that, according to different actual needs, the injection assembly 30 may include only one injector 35, in which case the first sub-inlet 351 of the injector 35 is the first inlet end 31, and the second sub-inlet 352 is the second inlet end 32. Alternatively, the injector 35 assembly may include a plurality of injectors 35 arranged in parallel, in which case the first sub-inlets 351 of the plurality of injectors 35 are connected in parallel to the first inlet end 31, and the second sub-inlets 352 of the plurality of injectors 35 are connected in parallel to the second inlet end 32.

[0086] The first gas-liquid separator 36 is a functional component for separating fluids of different phases in the injection assembly 30. The gaseous fluid leaving the first gas-liquid separator 36 can enter the first compressor 11 to reduce the adverse effects of the liquid fluid on the first compressor 11 and improve the operating reliability of the first compressor 11. The liquid fluid leaving the first gas-liquid separator 36 can enter the second heat exchange element 22 and perform heat exchange with the external environment, thereby absorbing heat from the external environment.

[0087] In the embodiment of the present application, the injection assembly 30 is provided to include an ejector 35 and a first gas-liquid separator 36. With the aid of the ejector 35, the expansion work can be fully recovered to reduce the overall power consumption of the first compressor 11, while the first gas-liquid separator 36 can separate fluids of different phases, thereby improving the operating reliability of the first compressor 11, meeting the evaporation requirements of the second heat exchange element 22, and improving the overall performance of the heat pump system.

[0088] In some embodiments, the injection assembly 30 further includes a first control member 51, and the number of the injectors 35 and the first control member 51 are both multiple and correspondingly arranged. The inlets of the multiple first control members 51 are connected in parallel to the first inlet end 31, the outlets of the first control member 51 are connected to the first sub-inlet 351 of the corresponding injector 35, the multiple second sub-inlet 352 are connected in parallel to the second inlet end 32, and the outlets of the multiple injectors 35 are connected in parallel to the inlet of the first gas-liquid separator 36.

[0089] The first control member 51 is arranged in front of the first sub-inlet 351 of the injector 35, and is used to control the fluid entering the injector 35 through the first sub-inlet 351. Among them, for the injector 35, the fluid pressure at the first sub-inlet 351 and the second sub-inlet 352 has a direct relationship with the structural size of the injector 35. When the structural size of the injector 35 is determined, the fluid pressure at the first sub-inlet 351 and the second sub-inlet 352 will be limited within a certain range. Thus, the first control member 51 may only have a switch function without a flow regulating function. Optionally, the first control member 51 includes a switch solenoid valve.

[0090] Furthermore, the number of the ejectors 35 and the first control element 51 are both multiple and are arranged corresponding to each other, and the multiple ejectors 35 are arranged on different branch pipelines to achieve parallel connection with each other. On this basis, when the heat pump system is running, the number of the multiple ejectors 35 opened and the corresponding first control element 51 can be selectively controlled to optimize the operating efficiency of the first loop system 100.

[0091] Specifically, the first circuit system 100 may also include a thermometer disposed at the inlet and outlet of the second heat exchanger 22, and the superheat corresponding to the second heat exchanger 22 is calculated by detecting the outlet temperature of the second heat exchanger 22, and then the opening number of the ejector 35 is selectively adjusted according to the magnitude of the superheat. For example, if the superheat is too low, the opening number of the ejector 35 may be increased, so that the fluid flow in the main circuit of the first circuit system 100 is increased, thereby enhancing the evaporation effect of the second heat exchanger 22 and increasing the superheat. If the superheat is too high, the opening number of the ejector 35 may be reduced, so that the fluid flow in the main circuit of the first circuit system 100 is reduced, thereby reducing the evaporation effect of the second heat exchanger 22 and reducing the superheat. Therefore, the first circuit system 100 in the embodiment of the present application can keep the superheat of the second heat exchanger 22 within a suitable range by adjusting the opening number of the ejector 35, thereby improving the stability and operation efficiency of the heat pump system.

[0092] It should be noted that the number of the ejectors 35 included in the ejection assembly 30 is not limited in the present embodiment, and it needs to be determined according to the type of fluid in the heat pump system and the specific working environment conditions. Figure 2 , the case where the injector 35 assembly includes three injectors 35 is shown.

[0093] In some embodiments, see Figure 3The heat pump system also includes a first heat recovery component 61, which includes a third heat exchange channel and a fourth heat exchange channel for realizing a heat exchange function. The third heat exchange channel is connected between the second outlet port 42 and the first inlet port 31, and the fourth heat exchange channel is connected between the inlet of the first compressor 11 and the gas outlet port 33.

[0094] The first heat recovery element 61 is a heat recovery device for recovering and reusing heat in the high-temperature fluid to improve the energy efficiency of the first circuit system 100. The first heat recovery element 61 includes a third heat exchange flow channel and a fourth heat exchange flow channel, the third heat exchange flow channel is located between the ejector 35 and the third heat exchange element 43, and the fourth heat exchange flow channel is located between the first gas-liquid separator 36 and the first compressor 11. The fluid in the fourth heat exchange flow channel can absorb heat from the fluid in the third heat exchange flow channel.

[0095] In the embodiment of the present application, the first heat recovery element 61 can heat the fluid entering the first compressor 11, so as to vaporize the entrained liquid droplets, reduce the risk of liquid hammer in the first compressor 11, and at the same time increase the suction temperature of the first compressor 11, reduce harmful overheating, and improve the working environment of the compressor. In addition, the first heat recovery element 61 can also increase the subcooling degree of the high-pressure mainstream entering the ejector 35, reduce the risk of vaporization before entering the ejector 35, and improve the overall operating reliability of the heat pump system.

[0096] In some optional embodiments, the first loop system 100 further includes a heat recovery regulating valve 55, the inlet of the heat recovery regulating valve 55 and the inlet of the fourth heat exchange flow channel are connected in parallel to the gas outlet end 33 of the first gas-liquid separator 36, and the outlet of the heat recovery regulating valve 55 and the outlet of the fourth heat exchange flow channel are connected in parallel to the inlet of the first compressor 11. The heat recovery regulating valve 55 can adjust its own opening to control the heat recovery temperature of the first heat recovery component 61. This design can further adjust the temperature of the fluid entering the first compressor 11, thereby improving the flexibility and reliability of the heat pump system.

[0097] In some embodiments, the first circuit system 100 further includes a second throttling element 52 , which is connected between the liquid outlet port 34 and the inlet of the second heat exchange element 22 .

[0098] The second throttling element 52 is a functional component that can achieve a throttling effect. The liquid fluid leaving the gas-liquid separator will first enter the second throttling element 52, and then leave the second throttling element 52 and enter the second heat exchange element 22. Optionally, the second throttling element 52 includes an electronic expansion valve.

[0099] In an embodiment of the present application, when the external environmental conditions change, such as when the ambient temperature changes, the evaporation temperature of the fluid in the second heat exchange element 22 can be adjusted by adjusting the opening of the second throttling element 52, so that the operation process of the heat pump system can meet the actual heat exchange needs.

[0100] In some embodiments, see Figure 4 The first circuit system 100 further includes a defrost branch 70 and a second control element 53 disposed on the defrost branch 70. The inlet of the defrost branch 70 is connected between the compressor outlet and the inlet of the first heat exchange element 21, and the outlet of the defrost branch 70 is connected between the liquid outlet end 34 and the inlet of the second heat exchange element 22. Optionally, the inlet of the first heat exchange element 21 and the defrost branch 70 are connected to the outlet of the first compressor 11 through a three-way valve, and the outlet of the second throttling element 52 and the defrost branch 70 are connected to the inlet of the second heat exchange element 22 through a three-way valve.

[0101] The setting of the defrost branch 70 can improve the operating reliability of the second heat exchanger 22, and the second control component 53 is used to select and control whether to perform the defrost operation. Specifically, when the external ambient temperature is low and causes frost on the second heat exchanger 22, the second control component 53 can be controlled to be turned on, and at this time, part of the high-temperature fluid leaving the first compressor 11 can enter the second heat exchanger 22 through the defrost branch 70, thereby defrosting it and improving the overall operating reliability of the heat pump system.

[0102] In some optional embodiments, the defrost branch 70 includes a capillary structure with a throttling effect (e.g., a capillary tube). By configuring the defrost branch 70 to include a capillary structure with a reasonable diameter, the high-temperature fluid passing through the defrost branch 70 can have a suitable pressure and temperature, thereby improving its defrosting efficiency for the second heat exchange element 22 and improving the defrosting effect of the heat pump system.

[0103] In some embodiments, the heat pump system further includes a second loop system 200, and the first loop system 100 and the second loop system 200 are used for different fluid flows. The second loop system 200 includes a second compressor 12, a fourth heat exchanger 23, a third throttling member 54 and a first heat exchanger 21 which are sequentially connected and arranged, and the first loop system 100 and the second loop system 200 achieve heat exchange through the first heat exchanger 21, and the second loop system 200 and the water supply system 300 achieve heat exchange through the fourth heat exchanger 23.

[0104] The fourth heat exchanger 23 can function as a condenser in the second loop system 200. The fourth heat exchanger 23 can include a seventh heat exchange channel and an eighth heat exchange channel for realizing heat exchange function. The seventh heat exchange channel is used for supplying fluid flow in the second loop system 200, and the eighth heat exchange channel is used for supplying fluid flow in the water supply system 300. The first heat exchanger 21 can function as an evaporator in the second loop system 200. The first heat exchanger 21 can include a fifth heat exchange channel and a sixth heat exchange channel for realizing heat exchange function. The fifth heat exchange channel is used for supplying fluid flow in the first loop system 100, and the sixth heat exchange channel is used for supplying fluid flow in the second loop system 200. Optionally, the fluid in the first loop system 100 is carbon dioxide, the fluid in the second loop system 200 is R134a, and the fluid in the water supply system 300 is heating water.

[0105] In combination with the above content, it can be known that when the structural dimensions of the ejector 35 are determined, the fluid pressure at the first sub-inlet 351 and the second sub-inlet 352 will be limited within a certain range. On this basis, the condensation temperature in the first circuit system 100 will also be limited within a specific range.

[0106] In view of this, in order to improve the flexibility of heat exchange between the heat pump system and the water supply system 300 and meet the actual needs of different external environmental conditions and different return water temperatures, the heat pump system in the embodiment of the present application is further provided with a second loop system 200, and the first loop system 100 and the second loop system 200 together form a cascade system. On this basis, the third throttling member 54 in the second loop system 200 can be a throttle valve, which can improve the flexibility of adjusting the condensing temperature in the second loop system 200, thereby meeting the heat exchange needs between the heat pump system and the water supply system 300 under different conditions and improving the overall applicability of the heat pump system.

[0107] According to some embodiments of the present application, Figure 4 As shown, the heat pump system includes a first loop system 100 and a second loop system 200. The first loop system 100 includes a first compressor 11, a first heat exchanger 21, an air supply assembly 40, an injection assembly 30, a second heat exchanger 22, a first heat recovery component 61, a heat recovery regulating valve, a second throttle 52, a defrost branch 70 and a second control component 53. The first compressor 11 includes an air supply port 111. The inlet of the first heat exchanger 21 is connected to the outlet of the first compressor 11. The air supply assembly 40 includes a third heat exchanger 43 and a first throttle 44. The third heat exchanger 43 includes a first heat exchange channel and a second heat exchange channel for realizing a heat exchange function. The outlet of the first heat exchange channel is connected to the first inlet end 31, and the second heat exchange channel is connected between the outlet of the first throttle 44 and the air supply port 111. Among them, the inlet of the first throttle 44 and the inlet of the first heat exchange channel are connected in parallel with the outlet of the first heat exchanger 21.

[0108] The injection assembly 30 includes an injector 35, a first control member 51, and a first gas-liquid separator 36. The number of injectors 35 and the number of first control members 51 are both multiple and correspondingly arranged. The inlet of the injector 35 includes a first sub-inlet 351 and a second sub-inlet 352. The inlets of the multiple first control members 51 are connected in parallel to the first inlet end 31. The outlet of the first control member 51 is connected to the first sub-inlet 351 of the corresponding injector 35. The multiple second sub-inlets 352 are connected in parallel to the second inlet end 32. The outlets of the multiple injectors 35 are connected in parallel to the inlet of the first gas-liquid separator 36. The first gas-liquid separator 36 includes a gas outlet end 33 and a liquid outlet end 34.

[0109] The first heat regenerator 61 includes a third heat exchange channel and a fourth heat exchange channel for realizing the heat exchange function. The third heat exchange channel is connected between the second outlet end 42 and the first inlet end 31, and the fourth heat exchange channel is connected between the inlet of the first compressor 11 and the gas outlet end 33. The inlet of the heat regenerator regulating valve and the inlet of the fourth heat exchange channel are connected in parallel to the gas outlet end 33 of the first gas-liquid separator 36, and the outlet of the heat regenerator regulating valve and the outlet of the fourth heat exchange channel are connected in parallel to the inlet of the first compressor 11. The heat regenerator regulating valve can adjust its opening to control the heat regenerator temperature of the first heat regenerator 61.

[0110] The second throttling element 52 is connected between the liquid outlet port 34 and the inlet of the second heat exchange element 22, the inlet of the defrost branch 70 is connected between the compressor outlet and the inlet of the first heat exchange element 21, the outlet of the defrost branch 70 is connected between the liquid outlet port 34 and the inlet of the second heat exchange element 22, the inlet of the first heat exchange element 21 and the defrost branch 70 are connected to the outlet of the first compressor 11 through a three-way valve, and the outlet of the second throttling element 52 and the defrost branch 70 are connected to the inlet of the second heat exchange element 22 through a three-way valve.

[0111] The second circuit system 200 includes a second compressor 12, a fourth heat exchange element 23, a third throttling element 54 and a first heat exchange element 21 which are connected in sequence. The first circuit system 100 and the second circuit system 200 achieve heat exchange through the first heat exchange element 21, and the second circuit system 200 and the water supply system 300 achieve heat exchange through the fourth heat exchange element 23.

[0112] It should be noted that, in addition to the functional components described above, the heat pump system may also include a variety of other functional components, which are not limited in the embodiments of the present application. Optionally, as shown in the figure, the first circuit system 100 also includes a first oil-gas separator 81, a first oil storage tank 82, a first drying filter 83, a ball valve 84, a thermometer, a pressure gauge and other components. The second circuit system 200 also includes a second heat recovery component 62, a second gas-liquid separator 85, a second oil-gas separator 86, a second drying filter 87, a ball valve 84, a thermometer, a pressure gauge and other components.

[0113] Second, see Figure 4 and Figure 5 The embodiment of the present application provides a control method for a heat pump system, wherein the heat pump system includes a first loop system 100 and a second loop system 200. The first loop system 100 includes a first compressor 11, a first heat exchanger 21, an air supply assembly 40, an injection assembly 30, and a second heat exchanger 22. The first compressor 11 includes an air supply port 111. The inlet of the first heat exchanger 21 is connected to the outlet of the first compressor 11. The inlet of the air supply assembly 40 is connected to the outlet of the first heat exchanger 21. The outlet of the air supply assembly 40 includes a first outlet end 41 and a second outlet end 42. The first outlet end 41 is connected to the air supply port 111. The inlet of the injection assembly 30 includes a first inlet end 31 and a second inlet end 32. The outlet of the injection assembly 30 includes a gas outlet end 33 and a liquid outlet end 34. The first inlet end 31 is connected to the second outlet end 42. The gas outlet end 33 is connected to the inlet of the first compressor 11. The inlet of the second heat exchanger 22 is connected to the liquid inlet end. The inlet of the second heat exchanger 22 is connected to the second inlet end 32.

[0114] The second loop system 200 includes a second compressor 12, a fourth heat exchanger 23, a third throttling member 54 and a first heat exchanger 21 which are connected in sequence. The first loop system 100 and the second loop system 200 realize heat exchange through the first heat exchanger 21, and the second loop system 200 and the water supply system 300 realize heat exchange through the fourth heat exchanger 23. The control method of the heat pump system includes:

[0115] S100: Determine the optimal condensing temperature of the first loop system based on the temperature of the external environment and the inlet and outlet temperatures of the water supply system.

[0116] In step S100, the optimal condensing temperature refers to: the condensing temperature corresponding to the optimal operating state of the heat pump system, that is, the condensing temperature corresponding to the system performance coefficient of the heat pump system reaches the maximum value under the current environmental conditions. Further, whether the heat pump system is in the optimal operating state needs to be specifically judged based on the actual operating conditions corresponding to the operation of the heat pump system and the displayed values ​​of the thermometer and pressure gauge at specific points in the heat pump system. It can be directly measured by experiment, or it can also be calculated by simulation, and the embodiments of the present application do not limit this.

[0117] Specifically, the control system corresponding to the heat pump system can determine the optimal condensing temperature according to the temperature of the external environment and the inlet and outlet temperatures of the water supply system 300 by calculating the heat exchange relationship between the condensing temperature in the first loop system 100 and the evaporation temperature in the second loop system 200.

[0118] S110: Based on the optimal condensing temperature and the superheat of the second heat exchange element, adjust at least one of the injection assembly and the air supplementation assembly.

[0119] In step S110, the first loop system 100 is regulated, and the superheat of the second heat exchanger 22 can be obtained by detecting and calculating the outlet temperature of the second heat exchanger 22. On this basis, according to the obtained superheat of the second heat exchanger 22, the injection assembly 30 can be selectively adjusted to change the fluid flow entering the second heat exchanger 22, achieve superheat adjustment, and optimize the operating efficiency of the first loop system 100.

[0120] The adjustment of the air supply component 40 can change the air supply pressure of the first compressor 11. On this basis, based on the optimal condensing temperature, the numerical value of the evaporation pressure corresponding to the optimal condensing pressure of the first loop system 100 and the current external ambient temperature can be calculated, and then the corresponding air supply parameters are matched according to the condensing pressure and evaporation pressure of the first loop system, and then the corresponding air supply pressure of the air supply component 40 is adjusted according to the air supply parameters to improve the overall performance of the heat pump system. In addition, this step also helps to further reduce the exhaust temperature of the first compressor 11 and improve the operating reliability of the first compressor 11.

[0121] It should be noted that, depending on actual needs, only the injection assembly 30 may be adjusted, or only the air supply assembly 40 may be adjusted, or both the injection assembly 30 and the air supply assembly 40 may be adjusted at the same time, and the embodiment of the present application does not limit this.

[0122] S120: Based on the optimal condensing temperature, adjust the opening of the third throttle element.

[0123] In step S120, this step is to adjust the second loop system 200. By adjusting the opening of the third throttling member 54, the evaporation pressure corresponding to the second loop system 200 can be assisted to match the pressure corresponding to the optimal condensing temperature, so that the heat pump system can be in the best operating state.

[0124] In the embodiment of the present application, the control system corresponding to the heat pump system dynamically calculates and adjusts the operating parameters of the first loop system 100 and the second loop system 200 by monitoring parameters such as the external ambient temperature and the inlet and outlet temperatures of the water supply system 300. Therefore, when the operating conditions change, the first loop system 100 can be adjusted to the optimal condensing temperature under the corresponding operating conditions, so that the heat pump system is in the best operating state, meets the maximum performance coefficient, and improves the overall performance of the heat pump system.

[0125] Furthermore, the control system can continuously collect parameter data such as the external ambient temperature, and then selectively adjust the third throttling device 54, the air supply component 40 and the injection component 30 according to the real-time feedback data, so as to form a closed-loop control, so that the condensing pressure in the first circuit system 100 and the evaporation pressure in the second circuit system 200 are always at the optimal operating point, meeting the need for the heat pump system to be in the optimal operating state and achieving efficient coordination of the entire system.

[0126] In addition, the control method provided in the embodiment of the present application can also make the pressure difference between the first loop system 100 and the second loop system 200 within an appropriate range, reduce the risk of overload or reduced efficiency of the first compressor 11 and the second compressor 12 due to an excessively high compression ratio, improve the operating reliability of the first compressor 11 and the second compressor 12, and achieve dynamic pressure balance of the heat pump system.

[0127] In some embodiments, see Figure 4 and Figure 6 The injection assembly includes a plurality of injectors arranged in parallel, and in step S110, includes:

[0128] S111: Determine the degree of superheat based on the outlet temperature of the second heat exchange element.

[0129] In step S111, superheat = outlet temperature of the second heat exchanger 22 - saturation temperature corresponding to the pressure. Too high or too low superheat can easily have an adverse effect on the operation of the heat pump system. If the superheat is too high, the compressor cannot operate in the best state, thereby affecting the system power consumption. If the superheat is too low, it is easy to cause ice on the surface of the second heat exchanger 22, affecting its operational reliability.

[0130] S112: Based on the superheat, adjusting the opening quantity of the plurality of injectors.

[0131] In step S112, the opening number of the ejector 35 can be selectively adjusted according to the degree of superheat, so that the superheat of the second heat exchange element 22 is maintained within a suitable range, thereby improving the stability and operation efficiency of the heat pump system.

[0132] S113: Based on the optimal condensing temperature, determine the condensing pressure and the evaporating pressure of the first loop system at the optimal condensing temperature.

[0133] In step S113, in order to make the heat pump system in the best operating state, it is also necessary to adjust the air supply volume and air supply pressure of the air supply component 40, and the air supply pressure of the air supply component 40 needs to match the condensing pressure and evaporation pressure of the first circuit system. Therefore, it is necessary to first determine the condensing pressure and evaporation pressure of the first circuit system that match the optimal condensing temperature, so that in the subsequent steps, the air supply pressure of the air supply component 40 is adjusted accordingly according to the condensing pressure and evaporation pressure.

[0134] S114: Based on the condensing pressure and the evaporating pressure of the first loop system at the optimal condensing temperature, the air supply volume and the air supply pressure of the air supply component are adjusted.

[0135] In step S114, the air supply pressure of the air supply component 40 to the first compressor 11 is adjusted according to the condensing pressure and the evaporation pressure of the first loop system at the optimal condensing temperature, so that the heat pump system can be in the best operating state. At the same time, the adjustment of the air supply amount helps to improve the reliability of the first compressor 11 and the overall performance of the first loop system 100. For example, if the air supply amount of the air supply component 40 to the first compressor 11 is increased, it helps to further reduce the exhaust temperature of the first compressor 11 and improve the operating stability of the first compressor 11.

[0136] It should be noted that for Figure 4 For the structure shown, the adjustment of the air supply volume and air supply pressure in the air supply component 40 can be achieved by relying on the first throttle 44. In other words, the air supply volume and air supply pressure of the air supply component 40 to the first compressor 11 can be adjusted by adjusting the opening of the first throttle 44.

[0137] In some embodiments, in step S112 , when the superheat is greater than a preset superheat, the opening number of the injector 35 is reduced; when the superheat is less than the preset superheat, the opening number of the injector 35 is increased.

[0138] When the superheat is greater than the preset superheat, it indicates that the superheat is too high. At this time, the opening number of the ejector 35 can be reduced to reduce the fluid flow entering the second heat exchange element 22, thereby reducing the evaporation effect of the second heat exchange element 22 and reducing the superheat.

[0139] Similarly, when the superheat is less than the preset superheat, it indicates that the superheat is too low. At this time, the number of ejectors 35 opened can be increased to increase the fluid flow rate entering the second heat exchange element 22, thereby enhancing the evaporation effect of the second heat exchange element 22 and increasing the superheat. It can be seen that the superheat of the second heat exchange element 22 can be maintained within a specific value or a suitable range by adjusting the number of ejectors 35 opened, thereby improving the stability and operation efficiency of the heat pump system.

[0140] It should be noted that the preset superheat mentioned here can be a specific value or a range value, which needs to be comprehensively considered based on the specific structural parameters of the second heat exchanger 22, the specific composition of the heat pump system and the specific application environment, etc. The embodiment of the present application does not limit this.

[0141] In some embodiments, in step S114, when the exhaust temperature of the first compressor 11 is greater than the preset exhaust temperature, the air supply volume of the air supply component 40 is increased. When the temperature of the external environment is lower than the preset environment temperature, the air supply volume of the air supply component 40 is increased.

[0142] In combination with the above content, it can be known that the air supply component 40 not only allows the first compressor 11 to absorb part of the air supply gas at the intermediate pressure, thereby reducing the impact of the large compression ratio on the first compressor 11, but also helps to reduce the exhaust temperature of the first compressor 11. On this basis, when the control system monitors through the thermometer that the exhaust temperature of the first compressor 11 is greater than the preset exhaust temperature, it indicates that the first compressor 11 has a higher exhaust temperature. At this time, the air supply amount of the air supply component 40 can be increased so that more air supply gas can enter the first compressor 11, thereby reducing the exhaust temperature of the first compressor 11.

[0143] When the control system detects that the ambient temperature is lower than the preset ambient temperature, it indicates that the current ambient temperature is too low. At this time, by increasing the air supply volume of the air supply component 40, the fluid flow rate through the first heat exchange element 21 can be increased, and the fluid specific enthalpy at the inlet of the second heat exchange element 22 can be reduced, thereby improving the performance of the heat pump system in a low temperature environment and enabling it to operate reliably under cold conditions.

[0144] It should be noted that the specific values ​​of the preset exhaust temperature and the preset ambient temperature need to be determined based on comprehensive considerations such as the structural parameters of the first compressor 11 itself, the number and types of functional components included in the heat pump system, and the connectivity relationships, and the embodiments of the present application do not impose any restrictions on this.

[0145] In some embodiments, in step S110, when the temperature of the external environment decreases or the load of the water supply system 300 increases, the number of openings of the ejectors 35 and the air supply amount of the air supply assembly 40 are sequentially increased. When the temperature of the external environment increases or the load in the water supply system 300 decreases, the air supply amount of the air supply assembly 40 and the number of openings of the ejectors 35 are sequentially decreased.

[0146] Specifically, when the temperature of the external environment decreases or the load of the water supply system 300 increases, the opening number of the ejectors 35 is increased first, and then the air supply amount of the air supply component 40 is increased if necessary. Similarly, when the temperature of the external environment increases or the load in the water supply system 300 decreases, the air supply amount of the air supply component 40 is reduced first, and then the opening number of the ejectors 35 is reduced if necessary.

[0147] In the embodiment of the present application, the number of ejectors 35 opened directly affects the fluid flow rate entering the second heat exchanger 22. On this basis, when the temperature of the external environment decreases or the load of the water supply system 300 increases, the number of ejectors 35 opened is increased first, so that the heat pump system can effectively improve the absorption of environmental heat at the second heat exchanger 22, thereby effectively improving the heating effect of the heat pump system. After that, the air supply volume of the air supply component 40 is increased when necessary to improve the operating stability of the heat pump system.

[0148] However, considering that the number of ejectors 35 opened will have a great impact on the operating parameters of the entire heat pump system, when the temperature of the external environment increases or the load in the water supply system 300 decreases, it is preferred to reduce the air supply amount of the air supply component 40. If the heat pump system can be in the best operating state by reducing the air supply amount, it is not necessary to change the number of ejectors 35 opened. However, in other necessary cases, it is necessary to reduce the number of ejectors 35 opened to comprehensively adjust the heat pump system.

[0149] In some embodiments, in step S112 , it includes: adjusting the opening degree of the third throttle member 54 based on the change of the corresponding opening quantity of the injector 35 .

[0150] In the embodiment of the present application, during the change in the number of ejectors 35 opened, in order to reduce the drastic change in superheat, the opening of the third throttle element 54 in the second loop system 200 is briefly adjusted for buffering, thereby achieving auxiliary regulation of the first loop system 100, alleviating the superheat change rate of the second heat exchange element 22 in the first loop system 100, and improving the overall stability of the heat pump system.

[0151] It should be noted that, during the operation of the heat pump system, in addition to adjusting the operating parameters in the first loop system 100 and the second loop system 200 as described above, it is also necessary to adjust the water supply system 300. Optionally, based on the inlet and outlet temperatures and flow rates of the fourth heat exchange element 23 in the second loop system 200, the fluid flow rate in the water supply system 300 is adjusted so that the heat pump system can continuously and stably supply heat.

[0152] Although the embodiments disclosed in this application are as above, the contents described are only embodiments adopted for facilitating the understanding of this application and are not intended to limit the present invention. Any technician in the technical field to which this application belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in this application, but the scope of protection of this application shall still be subject to the scope defined in the attached claims.

[0153] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the replacement of other connection methods described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of the present application.

Claims

1. A heat pump system, characterized in that: For increasing the temperature of a fluid in a water supply system, the heat pump system comprises a first loop system, wherein the first loop system comprises: A first compressor including an air supply port; a first heat exchange element, wherein an inlet of the first heat exchange element is connected to an outlet of the first compressor; An air supply component, wherein the inlet of the air supply component is connected to the outlet of the first heat exchange component, the outlet of the air supply component comprises a first outlet end and a second outlet end, and the first outlet end is connected to the air supply port; An injection assembly, wherein the inlet of the injection assembly comprises a first inlet end and a second inlet end, the outlet of the injection assembly comprises a gas outlet end and a liquid outlet end, the first inlet end is connected to the second outlet end, and the gas outlet end is connected to the inlet of the first compressor; A second heat exchange element, wherein the inlet of the second heat exchange element is connected to the liquid outlet end, and the outlet of the second heat exchange element is connected to the second inlet end.

2. The heat pump system according to claim 1, characterized in that: The air supply component includes a third heat exchange component and a first throttling component, wherein the third heat exchange component includes a first heat exchange channel and a second heat exchange channel for realizing a heat exchange function, wherein the outlet of the first heat exchange channel is connected to the first inlet end, and the second heat exchange channel is connected between the outlet of the first throttling component and the air supply port; The inlet of the first throttling element and the inlet of the first heat exchange channel are connected in parallel to the outlet of the first heat exchange element.

3. The heat pump system according to claim 1 or 2, characterized in that: The injection assembly comprises an injector and a first gas-liquid separator, the inlet of the injector comprises a first sub-inlet connected to the first inlet end and a second sub-inlet connected to the second inlet end, and the outlet of the injector is connected to the inlet of the first gas-liquid separator; Wherein, the first gas-liquid separator includes the gas outlet end and the liquid outlet end.

4. The heat pump system according to claim 3, characterized in that: The injection assembly further includes a first control member, and the injectors and the first control member are both multiple in number and are correspondingly arranged; Multiple inlets of the first control members are connected in parallel to the first inlet end, the outlet of the first control member is connected to the first sub-inlet corresponding to the injector, multiple second sub-inlets are connected in parallel to the second inlet end, and multiple outlets of the injectors are connected in parallel to the inlet of the first gas-liquid separator.

5. The heat pump system according to claim 1, characterized in that: It also includes a first heat recovery component, which includes a third heat exchange channel and a fourth heat exchange channel for realizing a heat exchange function, the third heat exchange channel is connected between the second outlet end and the first inlet end, and the fourth heat exchange channel is connected between the inlet of the first compressor and the gas outlet end.

6. The heat pump system according to claim 1, characterized in that: The first circuit system further includes a second throttling element, which is connected between the liquid outlet and the inlet of the second heat exchange element.

7. The heat pump system according to claim 1, characterized in that: The first circuit system also includes a defrost branch and a second control component arranged on the defrost branch. The inlet of the defrost branch is connected between the first compressor outlet and the first heat exchanger inlet, and the outlet of the defrost branch is connected between the liquid outlet end and the inlet of the second heat exchanger.

8. The heat pump system according to claim 1, characterized in that: The heat pump system further comprises a second circuit system, wherein the first circuit system and the second circuit system are used for providing different fluids to flow; Among them, the second circuit system includes a second compressor, a fourth heat exchange element, a third throttling element and the first heat exchange element which are connected in sequence, the first circuit system and the second circuit system realize heat exchange through the first heat exchange element, and the second circuit system and the water supply system realize heat exchange through the fourth heat exchange element.

9. A control method for a heat pump system, characterized in that: Used to control the heat pump system according to claim 8, characterized in that the control method comprises: Determining an optimal condensing temperature of the first loop system based on the temperature of the external environment and the inlet and outlet temperatures of the water supply system; Based on the optimal condensing temperature and the superheat of the second heat exchange element, adjusting at least one of the injection assembly and the air supplement assembly; Based on the optimal condensing temperature, the opening degree of the third throttle element is adjusted.

10. The control method according to claim 9, characterized in that: The injection assembly includes a plurality of injectors arranged in parallel, and the adjusting at least one of the injection assembly and the air supply assembly based on the optimal condensing temperature and the superheat of the second heat exchanger includes: determining the degree of superheat based on the outlet temperature of the second heat exchange element; Based on the superheat, adjusting the opening number of the plurality of injectors; Based on the optimal condensing temperature, determining the condensing pressure and the evaporating pressure of the first loop system at the optimal condensing temperature; Based on the condensing pressure and the evaporating pressure of the first loop system at the optimal condensing temperature, the air supply volume and the air supply pressure of the air supply component are adjusted.

11. The control method according to claim 10, characterized in that: In the step of adjusting the opening number of the plurality of injectors based on the superheat, When the superheat is greater than a preset superheat, reducing the opening quantity of the injector; When the superheat is less than a preset superheat, the opening quantity of the injector is increased.

12. The control method according to claim 10, characterized in that: In adjusting the air supply amount of the air supply component based on the condensing pressure and the evaporation pressure of the first loop system at the optimal condensing temperature, When the exhaust temperature of the first compressor is greater than a preset exhaust temperature, increasing the air supply volume of the air supply component; When the temperature of the external environment is lower than the preset environment temperature, the air supply amount of the air supply component is increased.

13. The control method according to claim 10, characterized in that: In the step of adjusting at least one of the injection assembly and the air supplement assembly based on the optimal condensing temperature and the superheat of the second heat exchange element, When the temperature of the external environment decreases or the load in the water supply system increases, the number of the ejectors opened and the amount of air supplied by the air supply assembly are increased in sequence; When the temperature of the external environment increases or the load in the water supply system decreases, the air supply amount of the air supply component and the opening number of the ejectors are reduced in sequence.

14. The control method according to claim 10, characterized in that: In adjusting the opening number of the plurality of injectors based on the superheat, the method includes: Based on the change in the corresponding opening quantity of the injector, the opening degree of the third throttle member is adjusted.

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