Heat management system for waste heat utilization

Abstract

The invention relates to the technical field of new energy automobile heat management, and provides a waste heat utilization heat management system which comprises a waste heat source, a first heat exchanger, a condenser and an evaporator, and the first heat exchanger is connected with the waste heat source and used for absorbing heat transmitted by the waste heat source; a first injection pipeline and a second injection pipeline are connected in parallel between the condenser and the first heat exchanger, a first injector is arranged in the first injection pipeline, and a second injector is arranged in the second injection pipeline; a heat absorption pipeline is connected between the evaporator and the condenser and used for absorbing heat of the evaporator, and a heat return pipeline is arranged between the evaporator and the condenser and used for returning the heat of the evaporator to the condenser. According to the heat management system provided by the invention, heat-work conversion of waste heat is carried out through coupling of the double ejectors, heat energy is converted into kinetic energy, the refrigeration effect is improved, and gradient utilization of energy is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management of new energy vehicles, and in particular to a thermal management system for waste heat utilization. Background Art

[0002] As the energy crisis continues to intensify and environmental problems become increasingly serious, new energy vehicles are gradually becoming mainstream. At present, electric vehicles have entered a rapid development stage, and users have higher and higher requirements for the service life of electric vehicles, the cooling and heating comfort of the passenger compartment, and the cruising range of the entire vehicle. Compared with traditional fuel vehicles, vehicles that use fuel cells as driving energy are more sensitive to temperature and have higher energy consumption in the thermal management system.

[0003] The existing thermal management system can effectively regulate the temperature of each subsystem, but lacks a unified planning of the energy of the entire vehicle, is inefficient and causes waste of available waste heat, greatly restricting the vehicle's endurance. Summary of the invention

[0004] The present invention provides a thermal management system for waste heat utilization, which is used to solve the problems of high energy consumption and greenhouse effect of working fluid in thermal management of new energy transportation vehicles in the prior art, and realizes the utilization of waste heat and a dual-ejector coupling system to convert thermal energy into kinetic energy, improve the refrigeration effect, and realize the cascade utilization of energy.

[0005] The present invention provides a thermal management system for waste heat utilization, comprising:

[0006] Waste heat source;

[0007] A first heat exchanger, the first heat exchanger is connected to the waste heat source and is used to absorb heat transferred by the waste heat source;

[0008] A condenser, wherein a first injection pipeline and a second injection pipeline are connected in parallel between the condenser and the first heat exchanger, a first injector is disposed in the first injection pipeline, and a second injector is disposed in the second injection pipeline;

[0009] An evaporator, a heat absorbing pipeline is connected between the evaporator and the condenser for absorbing the heat of the evaporator, and a heat return pipeline is arranged between the evaporator and the condenser for returning the heat of the evaporator to the condenser.

[0010] The thermal management system for waste heat utilization provided by the present invention also includes a waste heat recovery circulation loop, in which a circulating medium flows, and the waste heat recovery circulation loop includes an external radiator and a booster pump. The waste heat source, the first heat exchanger, the external radiator and the booster pump are connected in sequence to form a closed loop.

[0011] According to the thermal management system for waste heat utilization provided by the present invention, the middle outlet of the condenser is connected to the injection inlet of the second ejector through a pipeline.

[0012] The thermal management system for waste heat utilization provided in the present invention includes a second heat exchanger, wherein the first outlet of the second heat exchanger is connected to the inlet of the condenser, the first inlet of the second heat exchanger is connected to the first injection pipeline, the second inlet of the second heat exchanger is connected to the second injection pipeline, and the second outlet of the second heat exchanger is connected to the inlet of the first heat exchanger via a pipeline.

[0013] According to the thermal management system for waste heat utilization provided by the present invention, a third heat exchanger is provided in the heat absorption pipeline, a first inlet of the third heat exchanger is connected to an outlet of the condenser via a pipeline, a first outlet of the third heat exchanger is connected to an inlet of the evaporator via a pipeline, an outlet of the evaporator is connected to a second inlet of the third heat exchanger via a pipeline, and a second outlet of the third heat exchanger is connected to the heat return pipeline.

[0014] According to the thermal management system for waste heat utilization provided by the present invention, an expansion valve is provided in the pipeline between the first outlet of the third heat exchanger and the inlet of the evaporator.

[0015] According to the thermal management system for waste heat utilization provided by the present invention, the heat recovery pipeline includes a first branch, the first branch is connected between the second outlet of the third heat exchanger and the injection inlet of the first ejector, and a one-way valve is arranged in the first branch.

[0016] According to the waste heat utilization thermal management system provided by the present invention, the heat recovery pipeline also includes a second branch, the second branch is connected between the second outlet of the third heat exchanger and the first inlet of the second heat exchanger, and a compressor is arranged in the second branch.

[0017] According to the waste heat utilization thermal management system provided by the present invention, the heat recovery pipeline also includes a third branch, the third branch is connected between the outlet of the first ejector and the first inlet of the second heat exchanger, and a compressor is arranged on the third branch.

[0018] According to the thermal management system for waste heat utilization provided by the present invention, an in-vehicle heat exchanger is connected in parallel between the first heat exchanger and the external radiator, a first valve is provided in the pipeline where the in-vehicle heat exchanger is located, and a second valve is provided in the pipeline between the first heat exchanger and the external radiator.

[0019] The present invention provides a thermal management system for waste heat utilization, which utilizes the recovered waste heat as part or all of the power to drive a mixed jet refrigeration cycle, and can directly heat the vehicle using the recovered waste heat, thereby greatly reducing the energy consumption of the thermal management system and achieving precise utilization of energy of different grades. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of a thermal management system provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the structure of a compressor parallel auxiliary working mode of a thermal management system provided by an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the structure of a compressor series auxiliary working mode of a thermal management system provided by an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the structure of a pure injector working mode of a thermal management system provided by an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the structure of a pure compressor working mode of a thermal management system provided by an embodiment of the present invention;

[0026] Figure 6 One of the structural schematic diagrams of the waste heat recovery circuit in the pure compressor working mode of the thermal management system provided by an embodiment of the present invention;

[0027] Figure 7 The second structural schematic diagram of the waste heat recovery circuit in the pure compressor working mode of the thermal management system provided in an embodiment of the present invention.

[0028] Reference numerals:

[0029] 1. Waste heat source; 2. First heat exchanger; 3. Condenser; 4. First ejector; 5. Second ejector; 6. Expansion valve; 7. Evaporator; 8. Second heat exchanger; 9. Third heat exchanger; 10. Compressor; 11. One-way valve; 12. External radiator; 13. Water pump; 14. Internal heat exchanger; 15. First valve; 16. Second valve; 17. First solenoid valve; 18. Second solenoid valve; 19. Third solenoid valve; 20. Fourth solenoid valve; 21. Fifth solenoid valve; 22. First branch; 23. Second branch; 24. Third branch. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Combine the following Figures 1 to 7 A thermal management system for utilizing waste heat provided in an embodiment of the present invention is described.

[0032] The present embodiment provides a waste heat utilization thermal management system, comprising: a waste heat source 1, a first heat exchanger 2, a condenser 3 and an evaporator 7. The waste heat source 1 can be different types of equipment or devices, for example, a fuel cell.

[0033] Among them, the first heat exchanger 2 is connected to the waste heat source 1, and is used to absorb the heat transferred by the waste heat source 1; a first injection pipeline and a second injection pipeline are connected in parallel between the condenser 3 and the first heat exchanger 2, a first injector 4 is arranged in the first injection pipeline, and a second injector 5 is arranged in the second injection pipeline; a heat absorption pipeline is connected between the evaporator 7 and the condenser 3, and is used to absorb the heat of the evaporator 7, and a heat return pipeline is arranged between the evaporator 7 and the condenser 3, and is used to return the heat of the evaporator 7 to the condenser 3.

[0034] In this embodiment, the middle outlet of the condenser 3 is connected to the injection inlet of the second ejector 5 through a pipeline.

[0035] Reference Figures 1 to 5 In this embodiment, a second heat exchanger 8 is also included, the first outlet of the second heat exchanger 8 is connected to the inlet of the condenser 3, the first inlet of the second heat exchanger 8 is connected to the first injection pipeline, the second inlet of the second heat exchanger 8 is connected to the second injection pipeline, and the second outlet of the second heat exchanger 8 is connected to the inlet of the first heat exchanger 2 through a pipeline.

[0036] Furthermore, a third heat exchanger 9 is provided in the heat absorption pipeline, a first inlet of the third heat exchanger 9 is connected to an outlet of the condenser 3 via a pipeline, a first outlet of the third heat exchanger 9 is connected to an inlet of the evaporator 7 via a pipeline, an outlet of the evaporator 7 is connected to a second inlet of the third heat exchanger 9 via a pipeline, and a second outlet of the third heat exchanger 9 is connected to the heat recovery pipeline. In addition, an expansion valve 6 is provided in the pipeline between the first outlet of the third heat exchanger 9 and the inlet of the evaporator 7.

[0037] In some embodiments, a parallel-assisted working mode of the compressor 10 is adopted, and the heat recovery pipeline includes a first branch 22 and a second branch 23. The first branch 22 is connected between the second outlet of the third heat exchanger 9 and the injection inlet of the first ejector 4, and a one-way valve 11 is arranged in the first branch 22; the second branch 23 is connected between the second outlet of the third heat exchanger 9 and the first inlet of the second heat exchanger 8, and the compressor 10 is arranged in the second branch 23.

[0038] like Figure 2 As shown, the compressor 10 is coupled in parallel with the first ejector 4. For the refrigeration cycle, the high-temperature and high-pressure gas such as refrigerant provided by the second heat exchanger 8 to the condenser 3 exchanges heat with the condenser 3. The high-temperature and high-pressure gas is liquefied to become a liquid refrigerant. The refrigerant enters the third heat exchanger 9 for further subcooling to reduce the enthalpy value. After that, the refrigerant enters the evaporator 7 to absorb heat after being throttled by the expansion valve 6, and reduces the heat of the air around the evaporator 7. After that, the refrigerant enters the third heat exchanger 9 and is heated and divided into two paths to enter the first branch 22 and the second branch 23 respectively. The refrigerant entering the first branch 22 enters the first ejector 4 through the injection inlet of the first ejector 4 and mixes with the mainstream fluid (refrigerant) flowing out of the first heat exchanger 2, and then mixes with the high-temperature and high-pressure gaseous refrigerant discharged by the compressor 10 in the second branch 23, and then enters the second heat exchanger 8 and the condenser 3 in sequence together to form a refrigeration cycle.

[0039] In addition, the two-phase refrigerant flowing out of the middle outlet of the condenser 3 enters the second ejector 5 through the injection inlet of the second ejector 5, mixes with the mainstream fluid flowing through the second ejector 5, and then flows into the second heat exchanger 8 to absorb heat, and then returns to the first heat exchanger 2 through the pipeline between the second outlet of the second heat exchanger 8 and the inlet of the first heat exchanger 2. After absorbing the residual heat and increasing the enthalpy value, it enters the first injection pipeline and the second injection pipeline as the mainstream fluid again.

[0040] In this way, by setting up the second heat exchanger 8, the high-temperature fluid flowing out of the first injection pipeline can be used to heat the fluid coming out of the second injection pipeline in the second heat exchanger 8, thereby increasing the enthalpy of the fluid returning to the first heat exchanger 2 through the second heat exchanger 8, and increasing the enthalpy of the fluid flowing from the first heat exchanger 2 to the first injection pipeline and the second injection pipeline, thereby improving the injection effect of the two injectors.

[0041] In this embodiment, a waste heat recovery circulation loop is also included, in which a circulating medium flows. The waste heat recovery circulation loop includes an external radiator 12 and a booster pump. The waste heat source 1, the first heat exchanger 2, the external radiator 12 and the booster pump are connected in sequence to form a closed loop, and a booster pump such as a water pump 13 is used as the circulation power of the circulating medium.

[0042] like Figure 2 , Figure 3 , Figure 4 As shown, for the process of heating by waste heat recovery, if it is necessary to dissipate heat from the waste heat source 1 such as a fuel cell, the circulating medium absorbs heat from the waste heat source 1, exchanges heat with the mainstream fluid (refrigerant) in the first heat exchanger 2, releases heat, flows into the external heat exchanger, and then returns to the waste heat source 1 after being pressurized by the water pump 13, forming a closed loop.

[0043] In other embodiments, a compressor 10 is used in a series-assisted working mode, and the heat recovery pipeline includes a first branch 22 and a third branch 24. The first branch 22 is connected between the second outlet of the third heat exchanger 9 and the injection inlet of the first ejector 4, and a one-way valve 11 is arranged in the first branch 22; the third branch 24 is connected between the outlet of the first ejector 4 and the first inlet of the second heat exchanger 8, and the compressor 10 is arranged on the third branch 24.

[0044] like Figure 3 As shown, the compressor 10 is coupled in series with the first ejector 4. For the refrigeration cycle, the high-temperature and high-pressure gas such as refrigerant provided by the second heat exchanger 8 to the condenser 3 exchanges heat with the condenser 3. The high-temperature and high-pressure gas is liquefied to become a liquid refrigerant. The refrigerant enters the third heat exchanger 9 for further supercooling to reduce the enthalpy value. Then, after the refrigerant is throttled by the expansion valve 6, it enters the evaporator 7 to absorb heat and reduce the heat of the air around the evaporator 7. After that, the refrigerant enters the third heat exchanger 9 and is heated, and then enters the first branch 22, passes through the first ejector 4, passes through the third branch 24, and then enters the second heat exchanger 8. In this process, the refrigerant entering the first branch 22 enters the first ejector 4 through the injection inlet of the first ejector 4, mixes with the mainstream fluid flowing out of the first heat exchanger 2, and then enters the compressor 10 in the third branch 24. The high-temperature and high-pressure gaseous refrigerant discharged by the compressor 10 first enters the second heat exchanger 8 to release heat, and then enters the condenser 3 to exchange heat with the air, thereby forming a refrigeration cycle.

[0045] In addition, the two-phase refrigerant flowing out of the middle outlet of the condenser 3 enters the second ejector 5 through the injection inlet of the second ejector 5, mixes with the mainstream fluid flowing through the second ejector 5, and then flows into the second heat exchanger 8 to absorb heat, and then returns to the first heat exchanger 2 through the pipeline between the second outlet of the second heat exchanger 8 and the inlet of the first heat exchanger 2. After absorbing the residual heat and increasing the enthalpy value, it enters the first injection pipeline and the second injection pipeline as the mainstream fluid again.

[0046] In this way, by setting up the second heat exchanger 8, the high-temperature fluid flowing out of the first injection pipeline can be used to heat the fluid coming out of the second injection pipeline in the second heat exchanger 8, thereby increasing the enthalpy of the fluid returning to the first heat exchanger 2 through the second heat exchanger 8, and increasing the enthalpy of the fluid flowing from the first heat exchanger 2 to the first injection pipeline and the second injection pipeline, thereby improving the injection effect of the two injectors.

[0047] In other embodiments, a pure ejector working mode is adopted, and the heat recovery pipeline only includes a first branch 22 connected between the second outlet of the third heat exchanger 9 and the injection inlet of the first ejector 4, and a one-way valve 11 is provided in the first branch 22.

[0048] like Figure 4 As shown, the compressor 10 is not working. For the refrigeration cycle, the high-temperature and high-pressure gas such as refrigerant provided by the second heat exchanger 8 to the condenser 3 exchanges heat with the condenser 3. The high-temperature and high-pressure gas is liquefied to become a liquid refrigerant. The refrigerant enters the third heat exchanger 9 for further supercooling to reduce the enthalpy value. Then, after the refrigerant is throttled by the expansion valve 6, it enters the evaporator 7 to absorb heat and reduce the heat of the air around the evaporator 7. After that, the refrigerant enters the third heat exchanger 9 and is heated to enter the heat recovery pipeline. After passing through the first ejector 4, it enters the second heat exchanger 8. In this process, the gaseous refrigerant entering the heat recovery pipeline enters the first ejector 4 through the injection inlet of the first ejector 4, mixes with the mainstream fluid flowing out of the first heat exchanger 2, enters the second heat exchanger 8 to release heat, and then enters the condenser 3 to exchange heat with the air, thereby forming a refrigeration cycle.

[0049] In addition, the two-phase refrigerant flowing out of the middle outlet of the condenser 3 enters the second ejector 5 through the injection inlet of the second ejector 5, mixes with the mainstream fluid flowing through the second ejector 5, and then flows into the second heat exchanger 8 to absorb heat, and then returns to the first heat exchanger 2 through the pipeline between the second outlet of the second heat exchanger 8 and the inlet of the first heat exchanger 2. After absorbing the residual heat and increasing the enthalpy value, it enters the first injection pipeline and the second injection pipeline as the mainstream fluid again.

[0050] In this way, by setting up the second heat exchanger 8, the high-temperature fluid flowing out of the first injection pipeline can be used to heat the fluid coming out of the second injection pipeline in the second heat exchanger 8, thereby increasing the enthalpy of the fluid returning to the first heat exchanger 2 through the second heat exchanger 8, and increasing the enthalpy of the fluid flowing from the first heat exchanger 2 to the first injection pipeline and the second injection pipeline, thereby improving the injection effect of the two injectors.

[0051] In some embodiments, a pure compressor 10 working mode is adopted, the first injection pipeline and the second injection pipeline are disconnected, and the heat recovery pipeline only includes a second branch 23 connected between the second outlet of the third heat exchanger 9 and the first inlet of the second heat exchanger 8, and a compressor 10 is arranged in the second branch 23.

[0052] like Figure 5 As shown, the first ejector 4 and the second ejector 5 are closed, the first ejector pipeline and the second ejector pipeline, as well as the connection between the condenser 3 and the second ejector 5 are disconnected, and the liquid refrigerant enters the third heat exchanger 9 for further supercooling to reduce the enthalpy value. Then, the refrigerant is throttled by the expansion valve 6 and enters the evaporator 7 to absorb heat, thereby reducing the heat of the air around the evaporator 7. After that, the refrigerant enters the third heat exchanger 9 and is heated, and then enters the compressor 10 in the second branch 23. The high-temperature and high-pressure gaseous refrigerant is discharged by the compressor 10, first enters the second heat exchanger 8 to release heat, and then enters the condenser 3 to exchange heat with the air, forming a liquid refrigerant again and entering the third heat exchanger 9, thereby forming a refrigeration cycle.

[0053] In this embodiment, a pure compressor 10 working mode is adopted. For the waste heat recovery circuit, an in-vehicle heat exchanger 14 is connected in parallel between the first heat exchanger 2 and the external radiator 12. A first valve 15 is provided in the pipeline where the in-vehicle heat exchanger 14 is located, and a second valve 16 is also provided in the pipeline between the first heat exchanger 2 and the external radiator 12. The first valve 15 and the second valve 16 can be solenoid valves. Therefore, in the pure compressor 10 working mode, the process of heating for waste heat recovery can realize the heat dissipation of the waste heat source 1 such as a fuel cell, and realize the function of heating the interior of the vehicle. At this time, the first heat exchanger 2 does not work.

[0054] like Figure 1 and Figure 6 As shown, the pipeline where the in-vehicle heat exchanger 14 is located is connected in parallel with the second valve 16. By closing the first valve 15 and opening the second valve 16, the connection of the in-vehicle heat exchanger 14 is disconnected. After absorbing heat from the waste heat source 1, the circulating medium flows into the outdoor heat exchanger to dissipate heat to the air, and then returns to the waste heat source 1 after being pressurized by the water pump 13, forming a closed loop, thereby realizing the heat dissipation function of the waste heat source 1.

[0055] like Figure 1 and Figure 7As shown, by closing the second valve 16 and opening the first valve 15, the in-vehicle heat exchanger 14 is connected in series with the external radiator 12. At this time, the fan of the external radiator 12 does not work, and the circulating medium absorbs heat from the waste heat source 1, enters the in-vehicle heat exchanger 14 to release heat, and then flows into the external heat exchanger. Then, after being pressurized by the water pump 13, it returns to the waste heat source 1, forming a closed loop, thereby realizing the function of circulating heating in the vehicle.

[0056] An embodiment of the present invention provides a waste heat driven thermal management system, comprising a dual ejector coupled refrigeration cycle and a waste heat recovery cycle, wherein: Figure 1 As shown, the double-ejector coupled refrigeration cycle loop includes a first heat exchanger 2, a first ejector 4, a second ejector 5, a condenser 3, an expansion valve 6, an evaporator 7, five solenoid valves, a one-way valve 11, a second heat exchanger 8, a third heat exchanger 9 and a compressor 10.

[0057] Among them, the five solenoid valves are respectively a first solenoid valve 17 arranged between the one-way valve 11 and the second outlet of the third heat exchanger 9, a second solenoid valve 18 between the compressor 10 and the second outlet of the third heat exchanger 9, a third solenoid valve 19 between the compressor 10 and the first inlet of the second heat exchanger 8, a fourth solenoid valve 20 between the first ejector 4 and the first inlet of the second heat exchanger 8, and a fifth solenoid valve 21 arranged between the compressor 10 and the first ejector 4 in the third branch 24; by opening or closing the solenoid valves in different positions, the above-mentioned different working modes can be realized, for example, only closing the fifth solenoid valve 21, open the other four solenoid valves to realize the parallel auxiliary working mode of the compressor 10; close the second solenoid valve 18 and the fourth solenoid valve 20, open the other three solenoid valves to realize the series auxiliary working mode of the compressor 10; close the second solenoid valve 18, the third solenoid valve 19 and the fifth solenoid valve 21, open the other two solenoid valves to realize the pure injector working mode; open the second solenoid valve 18 and the third solenoid valve 19, close the other three solenoid valves, and close the two injectors to realize the pure compressor 10 working mode. By switching different working modes, it can better adapt to different operating conditions.

[0058] The fuel cell waste heat recovery circulation loop includes a fuel cell, a first heat exchanger 2, a first valve 15, a second valve 16, an in-vehicle heat exchanger 14, a water pump 13 and an external radiator 12. By opening or closing the first valve 15 or the second valve 16, waste heat can be used to directly heat the vehicle interior, so as to better utilize low-grade heat sources.

[0059] The thermal management system of the embodiment of the present invention can realize different working modes of the dual-ejector coupled refrigeration cycle loop and the fuel cell waste heat recovery cycle loop by opening or closing different solenoid valves, thereby reducing the overall energy consumption of the thermal management system by maximizing the rational use of energy.

[0060] The present invention provides a thermal management system for waste heat utilization, including a dual-ejector coupled refrigeration cycle and a fuel cell waste heat recovery cycle. To address the problems of high energy consumption in thermal management of transportation vehicles and the greenhouse effect of working fluids, the recovered waste heat is used as part or all of the power to drive a mixed ejector refrigeration cycle, and the recovered waste heat can be used to directly heat the vehicle, greatly reducing the energy consumption of the thermal management system. The invention is suitable for a variety of transportation vehicles such as fuel cell buses or ships.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A thermal management system for waste heat utilization, characterized in that: include: Waste heat source (1); A first heat exchanger (2), the first heat exchanger (2) being connected to the waste heat source (1) and being used to absorb heat transferred by the waste heat source (1); A condenser (3), wherein a first injection pipeline and a second injection pipeline are connected in parallel between the condenser (3) and the first heat exchanger (2), a first injector (4) is arranged in the first injection pipeline, and a second injector (5) is arranged in the second injection pipeline; An evaporator (7), a heat absorption pipeline is connected between the evaporator (7) and the condenser (3) for absorbing the heat of the evaporator (7), and a heat return pipeline is provided between the evaporator (7) and the condenser (3) for returning the heat of the evaporator (7) to the condenser (3).

2. The thermal management system for waste heat utilization according to claim 1, characterized in that: It also includes a waste heat recovery circulation loop, in which a circulating medium flows, and the waste heat recovery circulation loop includes an external radiator (12) and a booster pump. The waste heat source (1), the first heat exchanger (2), the external radiator (12) and the booster pump are connected in sequence to form a closed loop.

3. The thermal management system for waste heat utilization according to claim 1, characterized in that: The middle outlet of the condenser (3) is connected to the injection inlet of the second ejector (5) via a pipeline.

4. The thermal management system for waste heat utilization according to claim 1, characterized in that: It comprises a second heat exchanger (8), wherein the first outlet of the second heat exchanger (8) is connected to the inlet of the condenser (3), the first inlet of the second heat exchanger (8) is connected to the first injection pipeline, the second inlet of the second heat exchanger (8) is connected to the second injection pipeline, and the second outlet of the second heat exchanger (8) is connected to the inlet of the first heat exchanger (2) via a pipeline.

5. The thermal management system for waste heat utilization according to claim 4, characterized in that: A third heat exchanger (9) is provided in the heat absorption pipeline, a first inlet of the third heat exchanger (9) is connected to the outlet of the condenser (3) via a pipeline, a first outlet of the third heat exchanger (9) is connected to the inlet of the evaporator (7) via a pipeline, an outlet of the evaporator (7) is connected to the second inlet of the third heat exchanger (9) via a pipeline, and a second outlet of the third heat exchanger (9) is connected to the heat recovery pipeline.

6. The thermal management system for waste heat utilization according to claim 5, characterized in that: An expansion valve (6) is provided in the pipeline between the first outlet of the third heat exchanger (9) and the inlet of the evaporator (7).

7. The thermal management system for waste heat utilization according to claim 5, characterized in that: The heat recovery pipeline comprises a first branch (22), the first branch (22) being connected between the second outlet of the third heat exchanger (9) and the injection inlet of the first ejector (4), and a one-way valve (11) being arranged in the first branch (22).

8. The thermal management system for waste heat utilization according to claim 7, characterized in that: The heat recovery pipeline also includes a second branch (23), the second branch (23) is connected between the second outlet of the third heat exchanger (9) and the first inlet of the second heat exchanger (8), and a compressor (10) is arranged in the second branch (23).

9. The thermal management system for waste heat utilization according to claim 7, characterized in that: The heat recovery pipeline further comprises a third branch (24), wherein the third branch (24) is connected between the outlet of the first ejector (4) and the first inlet of the second heat exchanger (8), and a compressor (10) is arranged on the third branch (24).

10. The thermal management system for waste heat utilization according to claim 2, characterized in that: An in-vehicle heat exchanger (14) is connected in parallel between the first heat exchanger (2) and the external radiator (12); a first valve (15) is provided in the pipeline where the in-vehicle heat exchanger (14) is located, and a second valve (16) is provided in the pipeline between the first heat exchanger (2) and the external radiator (12).

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