A high-temperature heat pump system with a parallel condenser step heat extraction mode

Abstract

The application discloses a kind of parallel condenser cascade heat extraction mode high-temperature heat pump systems, belong to the technical field of compression heat pump, including evaporator, further include injection condensing module and compression buffer module, injection condensing module includes at least two groups of injection condensing units, adjacent group of injection condensing units are parallel to each other, each group of injection condensing units includes a ejector and a condenser, the ejector of each group and condenser are connected with each other;Compression buffer module includes at least one group of compression buffer units, each group of compression buffer units includes a compressor and a injection buffer tank, adjacent group of compression buffer units are sequentially connected with each other by compressor and injection buffer tank.Cold side is double-condenser parallel mode, realize one-stage exhaust and secondary exhaust are condensed respectively, improve heat transfer performance, realize cold side hot water temperature step-by-step promotion.

Description

Technical Field

[0001] This invention relates to the technical field of compression heat pumps, and more particularly to a high-temperature heat pump system with a parallel condenser cascade heat extraction mode. Background Technology

[0002] Existing compression heat pump systems typically use a single condenser for heat exchange, condensing the exhaust gas from the two-stage compression process. Because all compressed exhaust gas enters the condenser under high temperature and pressure, the condensation pressure is too high, resulting in insufficient utilization of the temperature difference at the condensation heat exchange end. This limits the release of condensation heat, leading to low system energy efficiency.

[0003] On the other hand, the hot water on the water side is heated only once in a single condenser, resulting in insufficient utilization of the temperature gradient and poor matching between the hot water quality and the temperature rise process, making it difficult to meet the demand for efficient heating. At the same time, as an important component for intermediate liquid injection cooling, if the driving fluid of the ejector lacks sufficient subcooling, it will lead to insufficient nozzle driving force and reduced ejection performance, making it difficult to effectively control the compressor exhaust temperature.

[0004] Therefore, there is an urgent need to propose a new "dual condenser parallel + ejector cooling" structure that can handle the primary and secondary compressed exhaust separately, forming a staged condensation and heat extraction mode under dual condensation pressure. At the same time, it can be combined with ejectors to achieve high-performance intermediate liquid spray cooling, so as to solve the problems of low heat exchange efficiency of existing single condensers, poor hot water temperature matching, insufficient jet cooling performance and limited system energy efficiency. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by providing a high-temperature heat pump system with a parallel condenser cascade heat extraction mode. In order to solve the problems of low condensation heat exchange efficiency and poor system energy efficiency, this invention simultaneously achieves a cascade heat extraction mode under dual condensation pressure and high-performance liquid spray cooling.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0007] A high-temperature heat pump system with parallel condenser cascade heat extraction mode includes an evaporator, a jet condenser module, and a compression buffer module;

[0008] The jet condensation module includes at least two sets of jet condensation units, with adjacent sets of jet condensation units connected in parallel. Each set of jet condensation units includes an ejector and a condenser, and the ejector and condenser of each set are connected to each other.

[0009] The compression buffer module includes at least one set of compression buffer units. Each set of compression buffer units includes a compressor and an injection buffer tank. Adjacent sets of compression buffer units are connected in series with each other through a compressor and an injection buffer tank.

[0010] The evaporator is connected to the jet condensation module, the jet condensation module is connected to the compression buffer module, and the compression buffer module is connected to the evaporator.

[0011] Furthermore, the jet condensation module includes a first condenser, a second condenser, a first ejector, and a second ejector;

[0012] The compression buffer module includes a first compressor, a second compressor, a first injection buffer tank, and a second injection buffer tank;

[0013] The hot water inlet of the second condenser is connected to the hot water pipe on the first condenser side, the hot water outlet of the second condenser is connected to the hot water pipe on the second condenser side, the hot water inlet of the first condenser is connected to the hot water pipe on the second condenser side, and the hot water outlet of the first condenser is connected to the hot water pipe on the third condenser side.

[0014] The refrigerant outlet of the first condenser is connected to a first mainstream pipeline, which is connected to the mainstream inlet of the first ejector. The mixing outlet of the first ejector is connected to a first mixing pipeline, which is connected to the inlet of the first ejector buffer tank. The outlet of the first ejector buffer tank is connected to a first gaseous refrigerant pipeline, which is connected to the inlet of the first compressor. The outlet of the first compressor is connected to a second gaseous refrigerant pipeline, which is connected to the inlet of the second ejector buffer tank. The outlet of the second ejector buffer tank is connected to a third gaseous refrigerant pipeline, which is connected to a fifth gaseous refrigerant pipeline, which is connected to the inlet of the second compressor. The outlet of the second compressor is connected to a sixth gaseous refrigerant pipeline, which is connected to the refrigerant inlet of the first condenser.

[0015] The refrigerant outlet of the second condenser is connected to a second main flow pipeline, which is connected to the main flow inlet of the second ejector. The mixing outlet of the second ejector is connected to a second mixing pipeline, which is connected to the inlet of the second ejector buffer tank. The outlet of the second ejector buffer tank is connected to a third refrigerant gas pipeline, which is connected to a fourth refrigerant gas pipeline, which is connected to the refrigerant inlet of the second condenser.

[0016] The heat source water inlet of the evaporator is connected to the first evaporation side hot water pipe, and the heat source water outlet of the evaporator is connected to the second evaporation side hot water pipe.

[0017] The evaporator's refrigerant outlet is connected to a first jet pipe, which is connected to a second jet pipe and a third jet pipe. The second jet pipe is connected to the jet inlet of the first ejector, and the third jet pipe is connected to the jet inlet of the second ejector. The evaporator's refrigerant inlet is connected to the outlet of the first jet buffer tank.

[0018] Furthermore, the first spray buffer tank is provided with a first baffle, which is positioned above the inlet of the first mixing pipeline.

[0019] Furthermore, the second spray buffer tank is provided with a second baffle, which is positioned above the inlet of the second mixing pipeline.

[0020] Furthermore, the outlet end of the first injection buffer tank is connected to a refrigerant liquid pipeline, the refrigerant liquid pipeline is connected to an expansion valve, the inlet end of the expansion valve is connected to the refrigerant liquid pipeline, the outlet end of the expansion valve is connected to a refrigerant gas-liquid two-phase pipeline, and the refrigerant gas-liquid two-phase pipeline is connected to the refrigerant inlet end of the evaporator.

[0021] Furthermore, it also includes a preheater, and the jet condensation module includes a first condenser, a second condenser, a first ejector, and a second ejector;

[0022] The compression buffer module includes a first compressor, a second compressor, a first injection buffer tank, and a second injection buffer tank;

[0023] The hot water inlet of the second condenser is connected to the hot water pipe on the first condenser side, the hot water outlet of the second condenser is connected to the hot water pipe on the second condenser side, the hot water inlet of the preheater is connected to the hot water pipe on the second condenser side, the hot water outlet of the preheater is connected to the hot water pipe on the third condenser side, the hot water pipe on the third condenser side is connected to the hot water inlet of the first condenser, and the hot water outlet of the first condenser is connected to the hot water pipe on the fourth condenser side.

[0024] The refrigerant outlet of the first condenser is connected to a first mainstream pipeline, which is connected to the refrigerant inlet of the preheater. The condenser outlet of the preheater is connected to a third mainstream pipeline, which is connected to the mainstream inlet of the first ejector. The mixing outlet of the first ejector is connected to a first mixing pipeline, which is connected to the inlet of the first ejector buffer tank. The outlet of the first ejector buffer tank is connected to a first gaseous refrigerant pipeline, which is connected to the inlet of the first compressor. The outlet of the first compressor is connected to a second gaseous refrigerant pipeline, which is connected to the inlet of the second ejector buffer tank. The outlet of the second ejector buffer tank is connected to a third gaseous refrigerant pipeline, which is connected to a fifth gaseous refrigerant pipeline, which is connected to the inlet of the second compressor. The outlet of the second compressor is connected to a sixth gaseous refrigerant pipeline, which is connected to the refrigerant inlet of the first condenser.

[0025] The refrigerant outlet of the second condenser is connected to a second main flow pipeline, which is connected to the main flow inlet of the second ejector. The mixing outlet of the second ejector is connected to a second mixing pipeline, which is connected to the inlet of the second ejector buffer tank. The outlet of the second ejector buffer tank is connected to a third refrigerant gas pipeline, which is connected to a fourth refrigerant gas pipeline, which is connected to the refrigerant inlet of the second condenser.

[0026] The heat source water inlet of the evaporator is connected to the first evaporation side hot water pipe, and the heat source water outlet of the evaporator is connected to the second evaporation side hot water pipe.

[0027] The evaporator's refrigerant outlet is connected to a first jet pipe, which is connected to a second jet pipe and a third jet pipe. The second jet pipe is connected to the jet inlet of the first ejector, and the third jet pipe is connected to the jet inlet of the second ejector. The evaporator's refrigerant inlet is connected to the outlet of the first jet buffer tank.

[0028] Furthermore, the first spray buffer tank is provided with a first baffle, which is positioned above the inlet of the first mixing pipeline.

[0029] Furthermore, the second spray buffer tank is provided with a second baffle, which is positioned above the inlet of the second mixing pipeline.

[0030] Furthermore, the outlet end of the first injection buffer tank is connected to a refrigerant liquid pipeline, the refrigerant liquid pipeline is connected to an expansion valve, the inlet end of the expansion valve is connected to the refrigerant liquid pipeline, the outlet end of the expansion valve is connected to a refrigerant gas-liquid two-phase pipeline, and the refrigerant gas-liquid two-phase pipeline is connected to the refrigerant inlet end of the evaporator.

[0031] In summary, compared with the prior art, the beneficial effects of the above technical solution are:

[0032] 1. This application uses a dual condenser connected in parallel to output the condensation heat released by the high-temperature and high-pressure exhaust and the low-temperature exhaust to the condenser side water circuit in stages according to different temperature ranges, thereby realizing the gradual heating of hot water, improving the temperature matching at the hot water end, increasing the utilization rate of the end temperature difference, and ensuring the quality of hot water and the energy efficiency of the system.

[0033] 2. This application utilizes independent condensation and staged heat extraction. This invention reduces system condensation pressure, minimizes irreversible cycle losses, and improves jet cooling efficiency, resulting in a more rational overall thermodynamic cycle and significantly enhanced heating performance coefficient. Furthermore, the heat exchange area of ​​the parallel dual condensers can be flexibly adjusted according to operating conditions, ensuring efficient system operation even under complex conditions such as low temperatures and high loads.

[0034] 3. This application sets up a preheater between the two condensers, which not only ensures the outlet water temperature on the condenser side, but also further cools the high-pressure liquid refrigerant after condensation, significantly improving its subcooling. As the main stream of the ejector, it enhances the nozzle driving force and ejection capability, thereby strengthening the injection mixing effect, achieving higher performance intermediate liquid injection cooling, effectively reducing the compressor exhaust temperature, and alleviating the heat load.

[0035] 4. By dynamically distributing the steam flow of the two condensers, this application enables the system to have higher adaptability to operating conditions and maintain stable and efficient operation under low temperature environment and high hot water load conditions. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of a high-temperature heat pump system with parallel condenser cascade heat extraction mode according to a first embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of a second embodiment of a high-temperature heat pump system with parallel condenser cascade heat extraction mode according to the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. First condenser; 2. Second condenser; 3. Preheater; 4. Evaporator; 5. First compressor; 6. Second compressor; 7. First injection buffer tank; 8. Second injection buffer tank; 9. Expansion valve; 10. First ejector; 11. Second ejector; 12. First baffle; 13. Second baffle;

[0040] 31. First condenser-side hot water pipe; 32. Second condenser-side hot water pipe; 33. Third condenser-side hot water pipe; 34. Fourth condenser-side hot water pipe; 41. First evaporator-side hot water pipe; 42. Second evaporator-side hot water pipe; 51. First refrigerant gaseous pipe; 52. Second refrigerant gaseous pipe; 53. Third refrigerant gaseous pipe; 54. Fourth refrigerant gaseous pipe; 55. Fifth refrigerant gaseous pipe; 56. Sixth refrigerant gaseous pipe; 61. Refrigerant liquid pipe; 62. Refrigerant gas-liquid two-phase pipe; 71. First mainstream pipe; 72. Second mainstream pipe; 73. Third mainstream pipe; 74. First ejector pipe; 75. Second ejector pipe; 76. Third ejector pipe; 81. First mixing pipe; 82. Second mixing pipe. Detailed Implementation

[0041] The principles and features of the present invention are described below with reference to all the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0042] This invention discloses a high-temperature heat pump system with a parallel condenser cascade heat extraction mode.

[0043] Example 1

[0044] Reference Figure 1 As shown, a high-temperature heat pump system with parallel condenser cascade heat extraction mode includes a first condenser 1, a second condenser 2, an evaporator 4, a first compressor 5, a second compressor 6, a first injection buffer tank 7, a second injection buffer tank 8, a first ejector 10, and a second ejector 11.

[0045] The hot water inlet of the second condenser 2 is connected to the first condensing side hot water pipe 31, the hot water outlet of the second condenser 2 is connected to the second condensing side hot water pipe 32, the hot water inlet of the first condenser 1 is connected to the second condensing side hot water pipe 32, and the hot water outlet of the first condenser 1 is connected to the third condensing side hot water pipe 33.

[0046] The refrigerant outlet of the first condenser 1 is connected to a first main flow pipe 71, which is connected to the main flow inlet of the first ejector 10. The mixing outlet of the first ejector 10 is connected to a first mixing pipe 81, which is connected to the inlet of the first injection buffer tank 7. The outlet of the first injection buffer tank 7 is connected to a first refrigerant gaseous pipe 51, which is connected to the inlet of the first compressor 5. The outlet of the first compressor 5 is connected to a second... A refrigerant gaseous pipeline 52 is connected to the inlet end of the second injection buffer tank 8. A third refrigerant gaseous pipeline 53 is connected to the outlet end of the second injection buffer tank 8. A fifth refrigerant gaseous pipeline 55 is connected to the third refrigerant gaseous pipeline 53. The fifth refrigerant gaseous pipeline 55 is connected to the inlet end of the second compressor 6. A sixth refrigerant gaseous pipeline 56 is connected to the outlet end of the second compressor 6. The sixth refrigerant gaseous pipeline 56 is connected to the refrigerant inlet end of the first condenser 1.

[0047] The first spray buffer tank 7 is provided with a first baffle 12, which is positioned above the inlet of the first mixing pipeline 81.

[0048] The refrigerant outlet of the second condenser 2 is connected to a second mainstream pipeline 72, which is connected to the mainstream inlet of the second ejector 11. The mixing outlet of the second ejector 11 is connected to a second mixing pipeline 82, which is connected to the inlet of the second injection buffer tank 8. The outlet of the second injection buffer tank 8 is connected to a third refrigerant gas pipeline 53, which is connected to a fourth refrigerant gas pipeline 54, which is connected to the refrigerant inlet of the second condenser 2.

[0049] The second injection buffer tank 8 is equipped with a second baffle 13, which is positioned above the inlet of the second mixing pipeline 82.

[0050] The heat source water inlet of the evaporator 4 is connected to the first evaporation side hot water pipe 41, and the heat source water outlet of the evaporator 4 is connected to the second evaporation side hot water pipe 42.

[0051] The evaporator 4 has a first jet pipe 74 connected to its refrigerant outlet. The first jet pipe 74 is connected to a second jet pipe 75 and a third jet pipe 76. The second jet pipe 75 is connected to the jet inlet of the first ejector 10. The third jet pipe 76 is connected to the jet inlet of the second ejector 11. The evaporator 4 has a refrigerant inlet connected to the outlet of the first jet buffer tank 7.

[0052] The outlet end of the first injection buffer tank 7 is connected to a refrigerant liquid pipeline 61, the refrigerant liquid pipeline 61 is connected to an expansion valve 9, the inlet end of the expansion valve 9 is connected to the refrigerant liquid pipeline 61, the outlet end of the expansion valve 9 is connected to a refrigerant gas-liquid two-phase pipeline 62, and the refrigerant gas-liquid two-phase pipeline 62 is connected to the refrigerant inlet end of the evaporator 4.

[0053] The specific plan is as follows:

[0054] Combination Figure 1 As shown, this invention provides a high-temperature heat pump system with parallel condenser cascade heat extraction mode, including a first condenser 1, a second condenser 2, an evaporator 4, a first compressor 5, a second compressor 6, a first injection buffer tank 7, a second injection buffer tank 8, an expansion valve 9, a first ejector 10, a second ejector 11, a first baffle 12, a second baffle 13, a first condensing-side hot water pipe 31, a second condensing-side hot water pipe 32, a third condensing-side hot water pipe 33, a first evaporating-side hot water pipe 41, and a second evaporator... Hot water pipe 42, first refrigerant gaseous pipe 51, second refrigerant gaseous pipe 52, third refrigerant gaseous pipe 53, fourth refrigerant gaseous pipe 54, fifth refrigerant gaseous pipe 55, sixth refrigerant gaseous pipe 56, refrigerant liquid pipe 61, refrigerant gas-liquid two-phase pipe 62, first main flow pipe 71, second main flow pipe 72, first jet flow pipe 74, second jet flow pipe 75, third jet flow pipe 76, first mixing pipe 81, second mixing pipe 82.

[0055] The outlet end of the first condensing side hot water pipe 31 is connected to the hot water inlet end of the second condenser 2, the hot water outlet end of the second condenser 2 is connected to the inlet end of the second condensing side hot water pipe 32, the outlet end of the second condensing side hot water pipe 32 is connected to the hot water inlet end of the first condenser 1, and the hot water outlet end of the first condenser 1 is connected to the inlet end of the third condensing side hot water pipe 33.

[0056] The outlet end of the first evaporation side hot water pipe 41 is connected to the heat source water inlet end of the evaporator 4, and the heat source water outlet end of the evaporator 4 is connected to the inlet end of the second evaporation side hot water pipe 42.

[0057] The refrigerant outlet of the first condenser 1 is connected to the inlet of the first main flow pipe 71, and the outlet of the first main flow pipe 71 is connected to the main flow inlet of the first ejector 10. The refrigerant outlet of the second condenser 2 is connected to the inlet of the second main flow pipe 72, and the outlet of the second main flow pipe 72 is connected to the main flow inlet of the second ejector 11. The refrigerant outlet of the evaporator 4 is connected to the inlet of the first ejector flow pipe 74, and the outlet of the first ejector flow pipe 74 is connected to the inlet of the second ejector flow pipe 75 and the inlet of the third ejector flow pipe 76, respectively. The outlet of the second ejector flow pipe 75 is connected to the ejector flow inlet of the first ejector 10. The outlet end of the third jet flow pipe 76 is connected to the jet flow inlet end of the second injector 11. The mixing flow outlet end of the first injector 10 is connected to the inlet end of the first mixing pipe 81. The outlet end of the first mixing pipe 81 is connected to the left inlet end of the first jet buffer tank 7. The first baffle 12 is installed on the upper side of the outlet of the first mixing pipe 81 in the first jet buffer tank 7. The mixing flow outlet end of the second injector 11 is connected to the inlet end of the second mixing pipe 82. The outlet end of the second mixing pipe 82 is connected to the left inlet end of the second jet buffer tank 8. The second baffle 13 is installed on the upper side of the outlet of the second mixing pipe 82 in the second jet buffer tank 8.

[0058] The right outlet of the first injection buffer tank 7 is connected to the inlet of the refrigerant liquid pipeline 61. The outlet of the refrigerant liquid pipeline 61 is connected to the inlet of the expansion valve 9. The outlet of the expansion valve 9 is connected to the inlet of the refrigerant gas-liquid two-phase pipeline 62. The outlet of the refrigerant gas-liquid two-phase pipeline 62 is connected to the refrigerant inlet of the evaporator 4.

[0059] The top outlet of the first injection buffer tank 7 is connected to the inlet of the first refrigerant gaseous pipeline 51. The outlet of the first refrigerant gaseous pipeline 51 is connected to the inlet of the first compressor 5. The outlet of the first compressor 5 is connected to the inlet of the second refrigerant gaseous pipeline 52. The outlet of the second refrigerant gaseous pipeline 52 is connected to the right inlet of the second injection buffer tank 8. The top outlet of the second injection buffer tank 8 is connected to the inlet of the third refrigerant gaseous pipeline 53. The outlet end of line 53 is connected to the inlet end of the fourth refrigerant gaseous line 54 and the inlet end of the fifth refrigerant gaseous line 55, respectively. The outlet end of the fourth refrigerant gaseous line 54 is connected to the refrigerant inlet end of the second condenser 2. The outlet end of the fifth refrigerant gaseous line 55 is connected to the inlet end of the second compressor 6. The outlet end of the second compressor 6 is connected to the inlet end of the sixth refrigerant gaseous line 56. The outlet end of the sixth refrigerant gaseous line 56 is connected to the refrigerant inlet end of the first condenser 1.

[0060] Compared with existing technologies, the beneficial effects of the above technical solution are:

[0061] This application, through the parallel arrangement of dual condensers, can output the condensation heat released by high-temperature and high-pressure exhaust and low-temperature exhaust in stages to the condenser side water circuit according to different temperature ranges, thereby realizing the gradual heating of hot water, improving the temperature matching at the hot water end, increasing the utilization rate of the end temperature difference, and ensuring the quality of hot water and the energy efficiency of the system.

[0062] This invention reduces system condensation pressure and minimizes irreversible cycle losses through independent condensation and staged heat extraction, while simultaneously improving jet cooling efficiency. This results in a more rational overall thermodynamic cycle and a significantly improved coefficient of performance (COP). Furthermore, the heat exchange area of ​​the parallel dual condensers can be flexibly adjusted according to operating conditions, ensuring efficient system operation even under complex conditions such as low temperatures and high loads.

[0063] This application, through the dynamic distribution of steam flow between the two condensers, enables the system to have higher adaptability to operating conditions and maintain stable and efficient operation under low temperature environment and high hot water load conditions.

[0064] The implementation principle of Example 1 is as follows:

[0065] The refrigerant exiting from the first condenser 1, after releasing heat, decreases in temperature and becomes the main working medium of the first ejector 10. It then passes through the main nozzle of the first ejector 10 and becomes a high-speed, low-pressure fluid, used to entrain a stream of gaseous refrigerant from the evaporator 4. The two streams of fluid mix in the first ejector 10 and are then diffused before being injected into the first injection buffer tank 7. The refrigerant exiting from the second condenser 2, after releasing heat, decreases in temperature and becomes the main working medium of the second ejector 11. It then passes through the main nozzle of the second ejector 11 and becomes a high-speed, low-pressure fluid, used to entrain another stream of gaseous refrigerant from the evaporator 4. The two streams of fluid mix in the second ejector 11 and are then diffused before being injected into the second injection buffer tank 8. The liquid refrigerant in the first injection buffer tank 7 is throttled and depressurized by the expansion valve 9 and enters the evaporator 4. After absorbing heat and increasing in temperature, it becomes the entraining fluid for the first ejector 10 and the second ejector 11, thus completing the cycle.

[0066] The gaseous refrigerant from the first injection buffer tank 7 enters the first compressor 5 for primary compression. The compressed gaseous refrigerant then enters the second injection buffer tank 8, where it exchanges heat with the two-phase mixed refrigerant from the second ejector 11. After the temperature drops, it splits into two streams: one stream enters the second condenser 2 to release latent heat, and the other stream enters the second compressor 6 to complete secondary compression. The compressed gaseous water then enters the first condenser 1 to release latent heat, thereby heating the water in the hot water pipe on the condenser side step by step.

[0067] Overall, this invention achieves two effects. First, by using parallel dual condensers, it can output the condensation heat released from high-temperature, high-pressure exhaust and low-temperature exhaust in stages to the condenser-side water circuit according to different temperature ranges. This enables gradual heating of the hot water, improves temperature matching at the hot water end, increases the utilization rate of the temperature difference, and ensures hot water quality and system energy efficiency. Second, through independent condensation and staged heat extraction, this invention reduces system condensation pressure, minimizes irreversible circulation losses, and improves jet cooling efficiency, making the overall system thermodynamic cycle more rational and significantly improving the coefficient of performance (COP). Third, the heat exchange area of ​​the parallel dual condensers can be flexibly adjusted according to operating conditions, ensuring efficient system operation even under complex conditions such as low temperature and high load.

[0068] Example 2

[0069] Reference Figure 2 As shown, the difference between this embodiment 2 and embodiment 1 is that it has a preheater 3.

[0070] A high-temperature heat pump system with parallel condenser cascade heat extraction mode includes a first condenser 1, a second condenser 2, a preheater 3, an evaporator 4, a first compressor 5, a second compressor 6, a first injection buffer tank 7, a second injection buffer tank 8, a first ejector 10, and a second ejector 11.

[0071] The hot water inlet of the second condenser 2 is connected to the first condensing side hot water pipe 31, the hot water outlet of the second condenser 2 is connected to the second condensing side hot water pipe 32, the hot water inlet of the preheater 3 is connected to the second condensing side hot water pipe 32, the hot water outlet of the preheater 3 is connected to the third condensing side hot water pipe 33, the third condensing side hot water pipe 33 is connected to the hot water inlet of the first condenser 1, and the hot water outlet of the first condenser 1 is connected to the fourth condensing side hot water pipe 34.

[0072] The refrigerant outlet of the first condenser 1 is connected to a first mainstream pipeline 71, which is connected to the refrigerant inlet of the preheater 3. The condensate outlet of the preheater 3 is connected to a third mainstream pipeline 73, which is connected to the mainstream inlet of the first ejector 10. The mixing outlet of the first ejector 10 is connected to a first mixing pipeline 81, which is connected to the inlet of the first injection buffer tank 7. The outlet of the first injection buffer tank 7 is connected to a first refrigerant gaseous pipeline 51, which is connected to the first compressor. The inlet end of compressor 5 is connected to a second refrigerant gaseous pipeline 52, the outlet end of compressor 5 is connected to the inlet end of the second injection buffer tank 8, the outlet end of the second injection buffer tank 8 is connected to a third refrigerant gaseous pipeline 53, the third refrigerant gaseous pipeline 53 is connected to a fifth refrigerant gaseous pipeline 55, the fifth refrigerant gaseous pipeline 55 is connected to the inlet end of compressor 6, the outlet end of compressor 6 is connected to a sixth refrigerant gaseous pipeline 56, and the sixth refrigerant gaseous pipeline 56 is connected to the refrigerant inlet end of compressor 1.

[0073] The first spray buffer tank 7 is provided with a first baffle 12, which is positioned above the inlet of the first mixing pipeline 81.

[0074] The refrigerant outlet of the second condenser 2 is connected to a second mainstream pipeline 72, which is connected to the mainstream inlet of the second ejector 11. The mixing outlet of the second ejector 11 is connected to a second mixing pipeline 82, which is connected to the inlet of the second injection buffer tank 8. The outlet of the second injection buffer tank 8 is connected to a third refrigerant gas pipeline 53, which is connected to a fourth refrigerant gas pipeline 54, which is connected to the refrigerant inlet of the second condenser 2.

[0075] The second injection buffer tank 8 is equipped with a second baffle 13, which is positioned above the inlet of the second mixing pipeline 82.

[0076] The heat source water inlet of the evaporator 4 is connected to the first evaporation side hot water pipe 41, and the heat source water outlet of the evaporator 4 is connected to the second evaporation side hot water pipe 42.

[0077] The evaporator 4 has a first jet pipe 74 connected to its refrigerant outlet. The first jet pipe 74 is connected to a second jet pipe 75 and a third jet pipe 76. The second jet pipe 75 is connected to the jet inlet of the first ejector 10. The third jet pipe 76 is connected to the jet inlet of the second ejector 11. The evaporator 4 has a refrigerant inlet connected to the outlet of the first jet buffer tank 7.

[0078] The outlet end of the first injection buffer tank 7 is connected to a refrigerant liquid pipeline 61, the refrigerant liquid pipeline 61 is connected to an expansion valve 9, the inlet end of the expansion valve 9 is connected to the refrigerant liquid pipeline 61, the outlet end of the expansion valve 9 is connected to a refrigerant gas-liquid two-phase pipeline 62, and the refrigerant gas-liquid two-phase pipeline 62 is connected to the refrigerant inlet end of the evaporator 4.

[0079] The specific plan is as follows:

[0080] Combination Figure 2 As shown, this invention provides a high-temperature heat pump system with parallel condenser cascade heat extraction mode, including a first condenser 1, a second condenser 2, a preheater 3, an evaporator 4, a first compressor 5, a second compressor 6, a first injection buffer tank 7, a second injection buffer tank 8, an expansion valve 9, a first ejector 10, a second ejector 11, a first baffle 12, a second baffle 13, a first condensing-side hot water pipe 31, a second condensing-side hot water pipe 32, a third condensing-side hot water pipe 33, a fourth condensing-side hot water pipe 34, and a first evaporating-side hot water pipe 41. Second evaporator side hot water pipe 42, first refrigerant gaseous pipe 51, second refrigerant gaseous pipe 52, third refrigerant gaseous pipe 53, fourth refrigerant gaseous pipe 54, fifth refrigerant gaseous pipe 55, sixth refrigerant gaseous pipe 56, refrigerant liquid pipe 61, refrigerant gas-liquid two-phase pipe 62, first main flow pipe 71, second main flow pipe 72, third main flow pipe 73, first ejector flow pipe 74, second ejector flow pipe 75, third ejector flow pipe 76, first mixing pipe 81, second mixing pipe 82.

[0081] The outlet end of the first condensing side hot water pipe 31 is connected to the hot water inlet end of the second condenser 2. The hot water outlet end of the second condenser 2 is connected to the inlet end of the second condensing side hot water pipe 32. The outlet end of the second condensing side hot water pipe 32 is connected to the hot water inlet end of the preheater 3. The hot water outlet end of the preheater 3 is connected to the inlet end of the third condensing side hot water pipe 33. The outlet end of the third condensing side hot water pipe 33 is connected to the hot water inlet end of the first condenser 1. The hot water outlet end of the first condenser 1 is connected to the inlet end of the fourth condensing side hot water pipe 34.

[0082] The outlet end of the first evaporation side hot water pipe 41 is connected to the heat source water inlet end of the evaporator 4, and the heat source water outlet end of the evaporator 4 is connected to the inlet end of the second evaporation side hot water pipe 42.

[0083] The refrigerant outlet of the first condenser 1 is connected to the inlet of the first mainstream pipe 71. The outlet of the first mainstream pipe 71 is connected to the refrigerant inlet of the preheater 3. The refrigerant outlet of the preheater 3 is connected to the inlet of the third mainstream pipe 73. The outlet of the third mainstream pipe 73 is connected to the mainstream inlet of the first ejector 10. The refrigerant outlet of the second condenser 2 is connected to the inlet of the second mainstream pipe 72. The outlet of the second mainstream pipe 72 is connected to the mainstream inlet of the second ejector 11. The refrigerant outlet of the evaporator 4 is connected to the inlet of the first jet pipe 74. The outlet of the first jet pipe 74 is connected to the inlet of the second jet pipe 75 and the inlet of the third jet pipe 76, respectively. The outlet end of the second jet flow line 75 is connected to the jet flow inlet end of the first injector 10, the outlet end of the third jet flow line 76 is connected to the jet flow inlet end of the second injector 11, the mixing flow outlet end of the first injector 10 is connected to the inlet end of the first mixing line 81, the outlet end of the first mixing line 81 is connected to the left inlet end of the first jet buffer tank 7, the first baffle 12 is installed on the upper side of the outlet of the first mixing line 81 in the first jet buffer tank 7, the mixing flow outlet end of the second injector 11 is connected to the inlet end of the second mixing line 82, the outlet end of the second mixing line 82 is connected to the left inlet end of the second jet buffer tank 8, and the second baffle 13 is installed on the upper side of the outlet of the second mixing line 82 in the second jet buffer tank 8.

[0084] The right outlet of the first injection buffer tank 7 is connected to the inlet of the refrigerant liquid pipeline 61. The outlet of the refrigerant liquid pipeline 61 is connected to the inlet of the expansion valve 9. The outlet of the expansion valve 9 is connected to the inlet of the refrigerant gas-liquid two-phase pipeline 62. The outlet of the refrigerant gas-liquid two-phase pipeline 62 is connected to the refrigerant inlet of the evaporator 4.

[0085] The top outlet of the first injection buffer tank 7 is connected to the inlet of the first refrigerant gaseous pipeline 51. The outlet of the first refrigerant gaseous pipeline 51 is connected to the inlet of the first compressor 5. The outlet of the first compressor 5 is connected to the inlet of the second refrigerant gaseous pipeline 52. The outlet of the second refrigerant gaseous pipeline 52 is connected to the right inlet of the second injection buffer tank 8. The top outlet of the second injection buffer tank 8 is connected to the inlet of the third refrigerant gaseous pipeline 53. The outlet end of line 53 is connected to the inlet end of the fourth refrigerant gaseous line 54 and the inlet end of the fifth refrigerant gaseous line 55, respectively. The outlet end of the fourth refrigerant gaseous line 54 is connected to the refrigerant inlet end of the second condenser 2. The outlet end of the fifth refrigerant gaseous line 55 is connected to the inlet end of the second compressor 6. The outlet end of the second compressor 6 is connected to the inlet end of the sixth refrigerant gaseous line 56. The outlet end of the sixth refrigerant gaseous line 56 is connected to the refrigerant inlet end of the first condenser 1.

[0086] Compared with existing technologies, the beneficial effects of the above technical solution are:

[0087] This application, through the parallel arrangement of dual condensers, can output the condensation heat released by high-temperature and high-pressure exhaust and low-temperature exhaust in stages to the condenser side water circuit according to different temperature ranges, thereby realizing the gradual heating of hot water, improving the temperature matching at the hot water end, increasing the utilization rate of the end temperature difference, and ensuring the quality of hot water and the energy efficiency of the system.

[0088] This invention reduces system condensation pressure and minimizes irreversible cycle losses through independent condensation and staged heat extraction, while simultaneously improving jet cooling efficiency. This results in a more rational overall thermodynamic cycle and a significantly improved coefficient of performance (COP). Furthermore, the heat exchange area of ​​the parallel dual condensers can be flexibly adjusted according to operating conditions, ensuring efficient system operation even under complex conditions such as low temperatures and high loads.

[0089] This application sets up a preheater 3 between the two condensers, which not only ensures the outlet water temperature on the condenser side, but also further cools the high-pressure liquid refrigerant after condensation, significantly improving its subcooling. As the main stream of the ejector, it enhances the nozzle driving force and ejection capability, thereby strengthening the injection mixing effect, achieving higher performance intermediate liquid injection cooling, effectively reducing the compressor exhaust temperature, and alleviating the heat load.

[0090] This application, through the dynamic distribution of steam flow between the two condensers, enables the system to have higher adaptability to operating conditions and maintain stable and efficient operation under low temperature environment and high hot water load conditions.

[0091] The implementation principle of Example 2 is as follows:

[0092] The refrigerant exiting the first condenser 1 releases heat and its temperature decreases. It then enters the preheater 3 for further subcooling. As the main working medium of the first ejector 10, it becomes a high-speed, low-pressure fluid through the main nozzle of the first ejector 10, which is used to entrain a stream of gaseous refrigerant from the evaporator 4. The two streams of fluid mix in the first ejector 10 and then diffuse before being injected into the first injection buffer tank 7. The refrigerant exiting the second condenser 2 releases heat and its temperature decreases. As the main working medium of the second ejector 11, it becomes a high-speed, low-pressure fluid through the main nozzle of the second ejector 11, which is used to entrain another stream of gaseous refrigerant from the evaporator 4. The two streams of fluid mix in the second ejector 11 and then diffuse before being injected into the second injection buffer tank 8. The liquid refrigerant in the first injection buffer tank 7 is throttled and depressurized by the expansion valve 9 and enters the evaporator 4. After absorbing heat and increasing its temperature, it becomes the entraining fluid for the first ejector 10 and the second ejector 11, thus completing the cycle.

[0093] Gaseous refrigerant from the first injection buffer tank 7 enters the first compressor 5 for primary compression. The compressed gaseous refrigerant then enters the second injection buffer tank 8, where it exchanges heat with the two-phase mixed refrigerant from the second ejector 11. After the temperature drops, it splits into two streams: one stream enters the second condenser 2 to release latent heat, and the other stream enters the second compressor 6 to complete secondary compression. The compressed gaseous water then enters the first condenser 1 to release latent heat. The water in the condenser-side hot water pipeline is heated by passing through the second condenser 2, the preheater 3, and the first condenser 1 in sequence.

[0094] Overall, the system achieves two effects. The preheater 3, placed between the two condensers, ensures the outlet water temperature on the condenser side while further cooling the condensed high-pressure liquid refrigerant, significantly increasing its subcooling. This subcooling then acts as the main jet injector, enhancing nozzle driving force and ejection capability, thereby strengthening the jet mixing effect and achieving higher-performance intermediate liquid injection cooling. This effectively reduces the compressor exhaust temperature and alleviates the heat load. Through dynamic distribution of steam flow between the two condensers, the system exhibits greater adaptability to operating conditions, maintaining stable and efficient operation under low-temperature environments and high hot water loads.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-temperature heat pump system with parallel condenser cascade heat extraction mode, comprising an evaporator (4), characterized in that: It also includes a jet condensation module and a compression buffer module; The jet condensation module includes at least two sets of jet condensation units, with adjacent sets of jet condensation units connected in parallel. Each set of jet condensation units includes an ejector and a condenser, and the ejector and condenser of each set are connected to each other. The compression buffer module includes at least one set of compression buffer units. Each set of compression buffer units includes a compressor and an injection buffer tank. Adjacent sets of compression buffer units are connected in series with each other through a compressor and an injection buffer tank. The evaporator (4) is connected to the jet condensation module, the jet condensation module is connected to the compression buffer module, and the compression buffer module is connected to the evaporator (4). The jet condensation module includes a first condenser (1), a second condenser (2), a first ejector (10), and a second ejector (11); The compression buffer module includes a first compressor (5), a second compressor (6), a first injection buffer tank (7), and a second injection buffer tank (8); The hot water inlet of the second condenser (2) is connected to the first condensing side hot water pipe (31), the hot water outlet of the second condenser (2) is connected to the second condensing side hot water pipe (32), the hot water inlet of the first condenser (1) is connected to the second condensing side hot water pipe (32), and the hot water outlet of the first condenser (1) is connected to the third condensing side hot water pipe (33). The refrigerant outlet of the first condenser (1) is connected to a first main flow pipe (71), which is connected to the main flow inlet of the first ejector (10). The mixing outlet of the first ejector (10) is connected to a first mixing pipe (81), which is connected to the inlet of the first injection buffer tank (7). The outlet of the first injection buffer tank (7) is connected to a first refrigerant gaseous pipe (51), which is connected to the inlet of the first compressor (5). The outlet of the first compressor (5) is connected to a second... A refrigerant gaseous pipeline (52) is connected to the inlet end of the second injection buffer tank (8). A third refrigerant gaseous pipeline (53) is connected to the outlet end of the second injection buffer tank (8). A fifth refrigerant gaseous pipeline (55) is connected to the third refrigerant gaseous pipeline (53). The fifth refrigerant gaseous pipeline (55) is connected to the inlet end of the second compressor (6). A sixth refrigerant gaseous pipeline (56) is connected to the outlet end of the second compressor (6). The sixth refrigerant gaseous pipeline (56) is connected to the refrigerant inlet end of the first condenser (1). The refrigerant outlet of the second condenser (2) is connected to the second main flow pipeline (72), the second main flow pipeline (72) is connected to the main flow inlet of the second ejector (11), the mixing flow outlet of the second ejector (11) is connected to the second mixing pipeline (82), the second mixing pipeline (82) is connected to the inlet of the second injection buffer tank (8), the gas outlet of the second injection buffer tank (8) is connected to the third refrigerant gas pipeline (53), the third refrigerant gas pipeline (53) is connected to the fourth refrigerant gas pipeline (54), and the fourth refrigerant gas pipeline (54) is connected to the refrigerant inlet of the second condenser (2). The heat source water inlet of the evaporator (4) is connected to the first evaporation side hot water pipe (41), and the heat source water outlet of the evaporator (4) is connected to the second evaporation side hot water pipe (42). The evaporator (4) is connected to a first jet pipe (74) at the refrigerant outlet. The first jet pipe (74) is connected to a second jet pipe (75) and a third jet pipe (76). The second jet pipe (75) is connected to the jet inlet of the first ejector (10). The third jet pipe (76) is connected to the jet inlet of the second ejector (11). The evaporator (4) is connected to the outlet of the first jet buffer tank (7).

2. A high-temperature heat pump system with parallel condenser cascade heat extraction mode according to claim 1, characterized in that: The first spray buffer tank (7) is provided with a first baffle (12), which is positioned above the inlet of the first mixing pipeline (81).

3. A high-temperature heat pump system with parallel condenser cascade heat extraction mode according to claim 1, characterized in that: The second spray buffer tank (8) is provided with a second baffle (13), which is positioned above the inlet of the second mixing pipeline (82).

4. A high-temperature heat pump system with parallel condenser cascade heat extraction mode according to claim 1, characterized in that: The outlet end of the first injection buffer tank (7) is connected to a refrigerant liquid pipeline (61), the refrigerant liquid pipeline (61) is connected to an expansion valve (9), the inlet end of the expansion valve (9) is connected to the refrigerant liquid pipeline (61), the outlet end of the expansion valve (9) is connected to a refrigerant gas-liquid two-phase pipeline (62), and the refrigerant gas-liquid two-phase pipeline (62) is connected to the refrigerant inlet end of the evaporator (4).

5. A high-temperature heat pump system with parallel condenser cascade heat extraction mode according to claim 1, characterized in that: It also includes a preheater (3); The hot water inlet of the preheater (3) is connected to the second condensing side hot water pipe (32), the hot water outlet of the preheater (3) is connected to the third condensing side hot water pipe (33), the third condensing side hot water pipe (33) is connected to the hot water inlet of the first condenser (1), and the hot water outlet of the first condenser (1) is connected to the fourth condensing side hot water pipe (34). The first main pipeline (71) is connected to the refrigerant inlet of the preheater (3), and the condensate outlet of the preheater (3) is connected to the third main pipeline (73), which is connected to the main inlet of the first ejector (10).

6. A high-temperature heat pump system with parallel condenser cascade heat extraction mode according to claim 5, characterized in that: The first spray buffer tank (7) is provided with a first baffle (12), which is positioned above the inlet of the first mixing pipeline (81).

7. A high-temperature heat pump system with parallel condenser cascade heat extraction mode according to claim 5, characterized in that: The second spray buffer tank (8) is provided with a second baffle (13), which is positioned above the inlet of the second mixing pipeline (82).

8. A high-temperature heat pump system with parallel condenser cascade heat extraction mode according to claim 5, characterized in that: The outlet end of the first injection buffer tank (7) is connected to a refrigerant liquid pipeline (61), the refrigerant liquid pipeline (61) is connected to an expansion valve (9), the inlet end of the expansion valve (9) is connected to the refrigerant liquid pipeline (61), the outlet end of the expansion valve (9) is connected to a refrigerant gas-liquid two-phase pipeline (62), and the refrigerant gas-liquid two-phase pipeline (62) is connected to the refrigerant inlet end of the evaporator (4).

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