An ejector-type gas replenishment and enthalpy enhancement system with an economizer

Abstract

The present application belongs to the technical field of heat pump system, and particularly relates to a kind of injection type air supplementing and enthalpy increasing system with economizer.The existing air supplementing and enthalpy increasing technology is difficult to balance "heating capacity, energy efficiency" under extremely cold working conditions, and it is difficult to improve the all-weather adaptability and low-temperature endurance performance of new energy vehicles.In view of the above problems, the present application provides a kind of injection type air supplementing and enthalpy increasing system with economizer, which comprises a heating system and a refrigeration system, and the heating system and the refrigeration system realize mode free switching through a reversing valve;The present application systematically solves the industry problem that the existing air supplementing and enthalpy increasing technology is difficult to balance "heating capacity, energy efficiency, cost, reliability" under extremely cold working conditions through the coupling design of ejector and economizer, the function deconstruction of double gas-liquid separator and the collaborative control of valve group, and provides a feasible and effective solution to improve the all-weather adaptability and low-temperature endurance performance of new energy vehicles.

Description

Technical Field

[0001] This invention belongs to the field of heat pump system technology, specifically relating to an ejector-type gas replenishment and enthalpy enhancement system with an economizer. Background Technology

[0002] With the rapid development of the new energy vehicle industry, especially the increasing market demand for vehicles' all-weather adaptability, the vehicle thermal management system, as a core component ensuring battery performance, drive system efficiency, and cabin thermal comfort, has become a key technology for industry research and development. Particularly in low-temperature environments, efficient and stable heating capabilities directly determine a vehicle's range and cold-weather driving ability.

[0003] Currently, thermal management systems for new energy vehicles mainly employ technologies such as resistance heating, basic heat pumps, and gas-injection enthalpy-enhancing heat pumps. Among these, gas-injection enthalpy-enhancing technology is widely considered the mainstream approach to solving the low-temperature heating problem because it can effectively improve the system's heating capacity and coefficient of performance (COP) in low-temperature environments. However, existing gas-injection enthalpy-enhancing heat pump systems still face significant technical bottlenecks in practical applications, as detailed below:

[0004] 1. Flash evaporator-type gas replenishment and enthalpy enhancement system:

[0005] This system uses a flash evaporator for gas-liquid separation to provide supplementary gas to the low- and medium-pressure compressor. Its advantages include a simple structure, clear control logic, and stable operation under mild low-temperature conditions, providing a certain increase in heating capacity. However, its supplementary gas pressure is directly determined by the saturation pressure within the flash evaporator, lacking active adjustment capability. This results in a significant drop in supplementary gas pressure with the evaporation pressure under extremely cold conditions (e.g., ambient temperatures below -20°C), leading to insufficient supplementary gas driving force. This fails to effectively increase the compressor's intake and exhaust temperatures, limiting the increase in heating capacity and making it difficult to meet heating demands at extreme low temperatures.

[0006] 2. Economizer-type gas replenishment and enthalpy enhancement system:

[0007] This system uses a plate heat exchanger as an economizer, allowing a portion of the refrigerant to exchange heat with the auxiliary refrigerant before throttling in the main circuit, achieving subcooling and thus increasing the enthalpy of the main circuit refrigerant, while also providing medium-pressure gas injection to the compressor. This system offers superior heating stability and comfort compared to flash evaporator systems under low-temperature conditions. However, its core drawback lies in the fact that the auxiliary refrigerant, after being depressurized by the throttling valve, is directly used for gas injection. The expansion work (i.e., pressure energy) generated during this throttling process is completely lost and not recovered. Therefore, although the system's energy efficiency is improved, it still cannot simultaneously achieve high heating capacity and high energy efficiency under extremely cold conditions, representing a bottleneck for further improvement in energy utilization efficiency.

[0008] 3. Flash evaporator type gas replenishment and enthalpy enhancement system:

[0009] This system utilizes the gravity stratification effect of the flash tank to achieve efficient gas-liquid separation, effectively improving heat exchange efficiency and system COP. However, this approach comes at the cost of extremely complex system structure and piping, posing a significant challenge to the limited space available in the vehicle. Furthermore, its stringent control logic and highly coupled operating parameters of various components not only increase the precision requirements and manufacturing costs of core components but also, due to the numerous valves and long pipelines, increase refrigerant friction and energy loss, resulting in a higher system failure rate and greater maintenance complexity.

[0010] In summary, existing gas-injection enthalpy enhancement technologies generally suffer from a technical contradiction when dealing with extremely cold conditions: "increased heating capacity and optimized energy efficiency cannot be achieved simultaneously." Either the system structure is simple but the increased heating capacity is limited (e.g., flash evaporator type), or the heating performance is improved but the throttling losses are severe and the potential for energy efficiency improvement is limited (e.g., economizer type), or the performance is excellent but the structure is complex, costly, and unreliable (e.g., flash tank type). Summary of the Invention

[0011] The existing technology has the problem that it is difficult to balance heating capacity and energy efficiency under extremely cold conditions, making it difficult to improve the all-weather adaptability and low-temperature range performance of new energy vehicles. To address this problem, this invention provides an ejector-type enthalpy-increasing system with an economizer. Its structure includes a heating system and a cooling system, which can be freely switched between modes via a reversing valve. The compressor, reversing valve, external evaporator, electronic expansion valve one, internal condenser, and gas-liquid condenser two in the ejector-type enthalpy-increasing system are shared functional components of both the heating and cooling systems. The fluid inlets and outlets of each functional component in the heating and cooling systems are determined according to the refrigerant flow direction in the pipeline; the outlet with the same flow direction as the refrigerant is the fluid inlet, and the outlet with the opposite flow direction is the fluid outlet.

[0012] The heating system includes a closed-loop main loop and branch loops;

[0013] The closed-loop main circuit is formed by connecting the compressor, reversing valve, in-vehicle condenser, solenoid valve, ejector, gas-liquid separator, and compressor in sequence. The fluid outlet of the in-vehicle condenser is connected to the primary inlet of the ejector (which can be the ejector structure disclosed in Chinese invention patents CN121539513A and CN120062165A, or a conventional commercially available ejector, such as the Carrier centrifuge ejector, model: 02XR54018001 or 02XR54018101). The nozzle of the ejector is connected to the air inlet of the gas-liquid separator. The exhaust port of the gas-liquid separator is connected to the air supply port of the compressor.

[0014] One end of the branch circuit connects to the main circuit to form connection point one. Connection point one is located on the connecting pipe between the in-vehicle condenser and solenoid valve one. The branch circuit includes pipes that sequentially connect electronic expansion valve one, external evaporator, reversing valve, and gas-liquid separator two. The exhaust port of the external evaporator is connected to the inlet of gas-liquid separator two through the reversing valve, and also connected to the secondary inlet of the ejector through a pipe via solenoid valve two. The exhaust port of gas-liquid separator two is connected to the inlet of the compressor through a pipe. The external evaporator...

[0015] The heating system also includes an economizer, which is a functional component that enables heat exchange between the ejector and the gas-liquid separator in the main circuit of the heating system and between the electronic expansion valve and the connection point in the branch circuit.

[0016] The bottom of the gas-liquid separator is connected to the branch circuit via a pipeline to form connection point two. Connection point two is located between the electronic expansion valve one and the external evaporator. The electronic expansion valve two is installed on the pipeline connecting the bottom of the gas-liquid separator one to the branch circuit.

[0017] Preferably, the closed-loop circuit of the refrigeration system is formed by sequentially connecting the compressor, reversing valve, external evaporator, electronic expansion valve one, internal condenser, reversing valve, gas-liquid condenser two, and compressor; the exhaust port of the internal condenser is connected to the air inlet of the gas-liquid separator two through the reversing valve.

[0018] Preferably, the reversing valve is a four-way reversing valve.

[0019] Preferably, the air inlet and exhaust outlet of the gas-liquid separator are both located above the maximum liquid level line restricted within the gas-liquid separator.

[0020] Preferably, the air inlet and exhaust outlet of the gas-liquid separator are both located above the maximum liquid level line restricted within the gas-liquid separator.

[0021] Preferably, the reversing valve is a four-way reversing valve.

[0022] Preferably, both electronic expansion valve one and electronic expansion valve two are throttling and pressure-reducing expansion valves.

[0023] Preferably, the solenoid valve 1, solenoid valve 2, electronic expansion valve 1, electronic expansion valve 2, and directional valve are all controlled by the controller to open or close the valves.

[0024] The working principle and process of the above-mentioned ejector-type gas injection enthalpy enhancement system with economizer in heating mode are as follows:

[0025] (1) Compressor exhaust: The compressor performs adiabatic compression on low-pressure steam to form high-temperature and high-pressure steam, which is discharged from the exhaust port.

[0026] (2) Four-way reversing valve flow channel: High-temperature and high-pressure steam enters the four-way reversing valve. In the heating mode, the valve core is in the "heating position" to guide the refrigerant to the vehicle condenser.

[0027] (3) Heat release from condensation inside the vehicle: High-temperature and high-pressure steam enters the condenser inside the vehicle and exchanges heat with the air inside the vehicle through forced convection. The high-temperature and high-pressure steam is condensed into a medium-temperature and high-pressure liquid.

[0028] (4) Branch flow splitting: The condensed high-pressure liquid refrigerant is split into two paths. The main circuit flows through the economizer and exchanges temperature with the low-temperature fluid in the make-up gas path; the enthalpy-increasing circuit flows into the ejector.

[0029] (5) Ejector enthalpy increase and pressure increase: The high-pressure liquid refrigerant in the gas supply line is ejected at high speed through the ejector nozzle to form a low-pressure zone, which "draws" the medium-pressure vapor in the main line into the mixing chamber. After the two fluids are fully mixed in the mixing chamber, they are decelerated and pressurized in the diffuser section to form medium-pressure superheated vapor, which enters the gas-liquid separator. This step recovers the energy lost by throttling and provides additional medium-pressure gas supply for the compressor, which significantly improves the heating capacity.

[0030] (6) External evaporation heat absorption: The liquid refrigerant cooled by the economizer enters the external evaporator after being throttled by the electronic expansion valve, where it exchanges heat with the ambient air outside the vehicle and vaporizes from liquid to low-temperature, low-pressure steam.

[0031] (7) The replenishment gas and the main airflow merge: After the medium-pressure steam output by the ejector is separated by the gas-liquid separator, the gas directly enters the intermediate chamber of the compressor as replenishment gas, increasing the compressor's discharge volume. The liquid enters the gas-liquid separator again through the "electronic expansion valve 2 - external evaporator - solenoid valve 2 - ejector" and enters the compressor as replenishment gas. The low-pressure steam generated by the external evaporator enters the gas-liquid separator and the compressor together through the solenoid valve 2. The other part enters the four-way reversing valve.

[0032] (8) Gas-liquid separation and cycle reset: Gas enters the gas-liquid separator II through the four-way reversing valve, separating the incompletely vaporized liquid droplets to ensure that the refrigerant entering the compressor is pure gaseous refrigerant. Subsequently, the high-temperature and high-pressure gas discharged by the compressor flows into the vehicle condenser through the four-way reversing valve to complete the entire heating cycle.

[0033] The working principle and process of the above-mentioned ejector-type gas injection enthalpy enhancement system with economizer in refrigeration mode are as follows:

[0034] (1) Compressor exhaust: High temperature and high pressure gaseous refrigerant flows to the evaporator outside the vehicle through the four-way reversing valve.

[0035] (2) Condensation and heat release: In the external evaporator, the refrigerant releases heat to the external environment and condenses into a high-pressure liquid state.

[0036] (3) Throttling: After the high-pressure liquid refrigerant is throttled by the electronic expansion valve, it becomes a low-temperature, low-pressure gas-liquid mixture.

[0037] (4) Evaporation inside the vehicle: The gas-liquid mixture after throttling enters the condenser inside the vehicle through the solenoid valve, where it exchanges heat with the air inside the vehicle through convection, absorbing the heat of the air inside the vehicle. The liquid part vaporizes into the gaseous state, and finally forms low-temperature and low-pressure steam.

[0038] (5) Gas-liquid separation: Low-temperature and low-pressure refrigerant vapor flowing out of the condenser in the vehicle enters the second gas-liquid separator. The separated pure gaseous refrigerant flows into the compressor inlet through the four-way reversing valve.

[0039] (6) Compressor intake: The gaseous refrigerant separated by the gas-liquid separator is drawn into the compressor, compressed and discharged as high-temperature and high-pressure gas, thus completing the cycle.

[0040] Beneficial effects:

[0041] Compared with existing technologies, the ejector-type gas replenishment and enthalpy enhancement system with an economizer provided by this invention has achieved significant technological progress in terms of heating capacity, system energy efficiency, and overall reliability under extremely cold conditions through innovative ejector and economizer coupling design and refined control of the flow path. The specific beneficial effects are reflected in the following aspects:

[0042] (1) By recovering throttling losses through the ejector, the gas supply pressure is actively increased, significantly enhancing the heating capacity in extreme cold:

[0043] In heating mode, this invention constructs a high-pressure drive path consisting of "in-vehicle condenser - solenoid valve 1 - ejector primary inlet" and an ejector path consisting of "economist auxiliary circuit - electronic expansion valve 1 - external evaporator - solenoid valve 2 - ejector secondary inlet". This design ensures that the low-pressure refrigerant after absorbing heat in the external evaporator does not return directly to the compressor, but is introduced into the ejector as a secondary flow. The high-pressure refrigerant from the main circuit expands and accelerates in the primary flow nozzle, entraining the secondary flow, and completing momentum exchange and energy recovery inside the ejector. Compared to the traditional economizer system (which directly replenishes gas after throttling in the auxiliary circuit), this invention successfully recovers and utilizes the expansion work lost during the throttling process of the electronic expansion valve 1, converting it into pressure energy, significantly increasing the refrigerant pressure entering the compressor replenishment port (after passing through the gas-liquid separator 1). This directly improves the volumetric efficiency and exhaust parameters of the compressor under extremely cold conditions (such as -20℃ and below), breaking through the technical bottleneck of insufficient gas injection pressure and limited heating capacity of traditional gas injection enthalpy enhancement systems under extreme low temperatures.

[0044] (2) By using the economizer and ejector in series coupling, a dual-effect gain mechanism of "deep supercooling + energy recovery" is constructed:

[0045] This invention places the economizer between the main circuit (between the ejector and the gas-liquid separator) and the branch circuit (between the electronic expansion valve and the connection point) for heat exchange. This placement design achieves dual benefits: firstly, the main circuit refrigerant undergoes deep subcooling in the economizer, increasing its enthalpy as it enters the vehicle's condenser, directly increasing the heating capacity per unit of refrigerant; secondly, the subcooled auxiliary circuit refrigerant is more stable after being throttled by the electronic expansion valve, making it more conducive to the efficient operation of the ejector as a secondary flow. The "quality" (subcooling) provided by the economizer and the "pressure" (pressure energy recovery) provided by the ejector work synergistically, creating a "1+1>2" energy efficiency gain effect, significantly improving the system's overall energy efficiency ratio (COP) in low-temperature environments.

[0046] (3) Innovative dual gas-liquid separator design to achieve functional decoupling and system structure simplification:

[0047] Unlike the complex and demanding flash tank systems in the prior art, this invention designs two clearly decoupled gas-liquid separators: which significantly reduces system complexity and manufacturing costs, and reduces the stringent requirements on vehicle layout space.

[0048] The gas-liquid separator is located between the ejector outlet and the compressor makeup gas port, and is specifically designed to process the two-phase gas-liquid fluid discharged from the ejector. Both its inlet and outlet are positioned above the highest liquid level line, ensuring that only dry, saturated gas enters the compressor for makeup gas, while the liquid is stored at the bottom.

[0049] The second gas-liquid separator is located between the evaporator outlet and the compressor suction port outside the vehicle. It is responsible for ensuring that the refrigerant entering the compressor suction port is a pure gas, thus ensuring the safe operation of the compressor.

[0050] This design replaces the complex flash tank and its stringent control logic with two simple and easy-to-control gas-liquid separators, ensuring both effective gas-liquid separation and efficient operation.

[0051] (4) Through coordinated control of valve groups, flexible mode switching and efficient operation under all working conditions can be achieved:

[0052] This invention achieves the following functions through the combined control of solenoid valve one, solenoid valve two, electronic expansion valve one, and electronic expansion valve two:

[0053] Heating mode: Open solenoid valve one to connect the main circuit to the ejector; open solenoid valve two to connect the outlet of the external evaporator to the secondary flow of the ejector; electronic expansion valve one controls the flow rate of the auxiliary circuit, and electronic expansion valve two controls the liquid discharge of gas-liquid separator one, thus constructing a complete ejector gas replenishment and enthalpy increase cycle.

[0054] Cooling mode: By switching via the four-way reversing valve, the system can be switched to the normal cooling cycle. At this time, the ejector and some branches can be bypassed to ensure the efficient operation of the cooling mode.

[0055] Adaptive operating conditions: Under non-extremely cold heating conditions, the ejector gas supply mode can be exited by adjusting the opening of the electronic expansion valve one or closing the solenoid valve two, and the system can be switched to normal economizer cycle to avoid unnecessary energy loss and achieve optimal energy efficiency under all operating conditions.

[0056] (5) Improve system reliability and reduce maintenance costs: The existing gas injection enthalpy enhancement technology faces the industry challenge of balancing "heat generation, energy efficiency, cost and reliability" under extremely cold conditions. This provides a practical engineering solution to improve the all-weather adaptability and low-temperature range performance of new energy vehicles.

[0057] Because the system eliminates the complex and precision-required flash tank, and both gas-liquid separators are mature and reliable standardized components, the overall reliability of the machine is significantly improved. At the same time, the simplified piping layout and clear flow path design make the system easier to troubleshoot in case of failure, reducing the technical threshold and cost of after-sales maintenance. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of an ejector-type gas replenishment and enthalpy enhancement system with an economizer provided by the present invention.

[0059] Figure 2 This is a schematic diagram of the refrigeration system in an ejector-type gas replenishment and enthalpy enhancement system with an economizer provided by the present invention.

[0060] Figure 3 This is a schematic diagram of the heating system in an ejector-type gas replenishment and enthalpy enhancement system with an economizer provided by the present invention. Detailed Implementation

[0061] The present invention will be described in detail below with reference to embodiments. However, it should be understood that the following embodiments are merely illustrative examples of implementation of the present invention and are not intended to limit the scope of the present invention.

[0062] As per the instruction manual Figure 1-3 As shown, this invention provides an ejector-type gas injection enthalpy enhancement system with an economizer. Its structure includes a heating system and a cooling system, which can be freely switched between modes through a reversing valve. The compressor, reversing valve, external evaporator, electronic expansion valve one, internal condenser, reversing valve two, and gas-liquid condenser two in the ejector-type gas injection enthalpy enhancement system are functional components shared by the cooling system and the heating system.

[0063] The heating system includes a closed-loop main loop and branch loops;

[0064] The closed-loop main circuit is formed by connecting the compressor, reversing valve, in-vehicle condenser, solenoid valve 1, ejector (Carrier centrifuge ejector, model: 02XR54018001), gas-liquid separator 1, and compressor in sequence. The fluid outlet of the in-vehicle condenser is connected to the primary flow inlet of the ejector. The nozzle of the ejector is connected to the air inlet of gas-liquid separator 1. The exhaust port of gas-liquid separator 1 is connected to the air supply port of the compressor.

[0065] One end of the branch circuit connects to the main circuit to form connection point one. Connection point one is located on the connecting pipe between the in-vehicle condenser and solenoid valve one. The branch circuit includes pipes that sequentially connect electronic expansion valve one, external evaporator, reversing valve, and gas-liquid separator two. The exhaust port of the external evaporator is connected to the inlet of gas-liquid separator two through the reversing valve, and also connected to the secondary inlet of the ejector through a pipe via solenoid valve two. The exhaust port of gas-liquid separator two is connected to the inlet of the compressor through a pipe. The external evaporator...

[0066] The heating system also includes an economizer (purchased from Hangzhou Shenshi, coaxial sleeve economizer (for gas replenishment and enthalpy increase), model SS-9010TT-Z). The economizer is a functional component that enables heat exchange between the ejector and the gas-liquid separator in the main circuit of the heating system and between the electronic expansion valve and the connection point in the branch circuit.

[0067] The bottom of the gas-liquid separator is connected to the branch circuit via a pipeline to form connection point two. Connection point two is located between the electronic expansion valve one and the external evaporator. The electronic expansion valve two is installed on the pipeline connecting the bottom of the gas-liquid separator one to the branch circuit.

[0068] In one specific implementation, the closed loop of the refrigeration system is formed by sequentially connecting the compressor, reversing valve, external evaporator, electronic expansion valve one, internal condenser, reversing valve, gas-liquid condenser two, and compressor; the exhaust port of the internal condenser is connected to the air inlet of the gas-liquid separator two through the reversing valve.

[0069] In one specific implementation, the reversing valve is a four-way reversing valve.

[0070] In one specific implementation, the air inlet and exhaust outlet of the gas-liquid separator are both located above the maximum liquid level line limited within the gas-liquid separator.

[0071] In one specific implementation, the air inlet and exhaust outlet of the gas-liquid separator are both located above the maximum liquid level line restricted within the gas-liquid separator.

[0072] In one specific implementation, the reversing valve is a four-way reversing valve.

[0073] In one specific implementation, both electronic expansion valve one and electronic expansion valve two are throttling and pressure-reducing expansion valves.

[0074] In one specific implementation, the solenoid valve 1, solenoid valve 2, electronic expansion valve 1, electronic expansion valve 2, and directional valve are all controlled by a controller to open and close the valves.

[0075] The working principle and process of the above-mentioned ejector-type gas injection enthalpy enhancement system with economizer in heating mode are as follows:

[0076] (1) Compressor exhaust: The compressor performs adiabatic compression on low-pressure (0.15-0.35MPa) steam to form high-temperature and high-pressure (2.0-2.8MPa, 80-120℃) steam, which is discharged from the exhaust port.

[0077] (2) Four-way reversing valve flow channel: High-temperature and high-pressure steam enters the four-way reversing valve. In the heating mode, the valve core is in the "heating position" to guide the refrigerant to the vehicle condenser.

[0078] (3) Heat release from condensation inside the vehicle: High-temperature and high-pressure steam enters the condenser inside the vehicle and exchanges heat with the air inside the vehicle through forced convection. The high-temperature and high-pressure steam is condensed into a medium-temperature and high-pressure liquid.

[0079] (4) Branch flow splitting: The condensed high-pressure liquid refrigerant is split into two paths. The main circuit flows through the economizer and exchanges temperature with the low-temperature fluid in the make-up gas path; the enthalpy-increasing circuit flows into the ejector.

[0080] (5) Ejector enthalpy increase and pressure increase: The high-pressure liquid refrigerant in the gas supply line is ejected at high speed through the ejector nozzle to form a low-pressure zone, which "draws" the medium-pressure vapor in the main line into the mixing chamber. After the two fluids are fully mixed in the mixing chamber, they are decelerated and pressurized in the diffuser section to form medium-pressure (1-1.6MPa) superheated vapor, which enters the gas-liquid separator. This step recovers the energy lost by throttling and provides additional medium-pressure gas supply for the compressor, which significantly improves the heating capacity.

[0081] (6) External evaporation heat absorption: The liquid refrigerant cooled by the economizer enters the external evaporator after being throttled by the electronic expansion valve. It exchanges heat with the ambient air outside the vehicle and vaporizes from liquid to low-temperature and low-pressure (0.3-0.6MPa, temperature close to ambient temperature) steam.

[0082] (7) Combination of make-up gas and main gas flow: The medium-pressure steam (0.9-1.7MPa, higher than the compressor make-up gas pressure, the compressor make-up gas pressure does not exceed 0.9MPa) output by the ejector is separated by the gas-liquid separator. The gas is used as make-up gas and directly enters the intermediate chamber of the compressor to increase the compressor's discharge volume. The liquid passes through "electronic expansion valve 2 - external evaporator - solenoid valve 2 - ejector" and enters the gas-liquid separator again as make-up gas. The low-pressure steam generated by the external evaporator passes through solenoid valve 2 and merges with the make-up gas, and enters the gas-liquid separator and the compressor together. The other part enters the four-way reversing valve.

[0083] (8) Gas-liquid separation and cycle reset: Gas enters the gas-liquid separator II through the four-way reversing valve, separating the incompletely vaporized liquid droplets to ensure that the refrigerant entering the compressor is pure gaseous refrigerant. Subsequently, the high-temperature and high-pressure gas discharged by the compressor flows into the vehicle condenser through the four-way reversing valve to complete the entire heating cycle.

[0084] The working principle and process of the above-mentioned ejector-type gas injection enthalpy enhancement system with economizer in refrigeration mode are as follows:

[0085] (1) Compressor exhaust: High temperature and high pressure gaseous refrigerant flows to the evaporator outside the vehicle through the four-way reversing valve.

[0086] (2) Condensation and heat release: In the external evaporator, the refrigerant releases heat to the external environment and condenses into a high-pressure liquid state.

[0087] (3) Throttling: After the high-pressure liquid refrigerant is throttled by the electronic expansion valve, it becomes a low-temperature and low-pressure (0.15-0.35MPa, temperature 5-10℃ lower than the ambient temperature) gas-liquid mixture.

[0088] (4) Evaporation inside the vehicle: The gas-liquid mixture after throttling enters the condenser inside the vehicle through the solenoid valve, where it exchanges heat with the air inside the vehicle through convection, absorbing the heat of the air inside the vehicle. The liquid part vaporizes into the gaseous state, and finally forms low-temperature and low-pressure steam.

[0089] (5) Gas-liquid separation: Low-temperature and low-pressure (0.3-0.6MPa, temperature close to ambient temperature) refrigerant vapor flowing out from the condenser in the vehicle enters the second gas-liquid separator. The separated pure gaseous refrigerant flows into the compressor inlet through the four-way reversing valve.

[0090] (6) Compressor intake: The gaseous refrigerant separated by the gas-liquid separator is drawn into the compressor, compressed and discharged as high-temperature and high-pressure gas, thus completing the cycle.

[0091] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An ejector-type gas replenishment and enthalpy enhancement system with an economizer, characterized in that, It includes a heating system and a cooling system, which can be freely switched between modes through a reversing valve; the compressor, reversing valve, external evaporator, electronic expansion valve 1, internal condenser, reversing valve, and gas-liquid condenser 2 in the ejector-type gas injection enthalpy enhancement system are functional components shared by the cooling system and the heating system. The heating system includes a closed-loop main loop and branch loops; The closed-loop main circuit is formed by connecting the compressor, reversing valve, in-vehicle condenser, solenoid valve 1, ejector, gas-liquid separator 1, and compressor in sequence. The fluid outlet of the in-vehicle condenser is connected to the primary flow inlet of the ejector. The nozzle of the ejector is connected to the air inlet of the gas-liquid separator 1. The exhaust port of the gas-liquid separator 1 is connected to the air supply port of the compressor. One end of the branch circuit connects to the main circuit to form connection point one. Connection point one is located on the connecting pipe between the in-vehicle condenser and solenoid valve one. The branch circuit includes pipes that sequentially connect electronic expansion valve one, external evaporator, reversing valve, and gas-liquid separator two. The exhaust port of the external evaporator is connected to the inlet of gas-liquid separator two through the reversing valve, and also connected to the secondary inlet of the ejector through a pipe via solenoid valve two. The exhaust port of gas-liquid separator two is connected to the inlet of the compressor through a pipe. The external evaporator... The heating system also includes an economizer, which is a functional component that enables heat exchange between the ejector and the gas-liquid separator in the main circuit of the heating system and between the electronic expansion valve and the connection point in the branch circuit. The bottom of the gas-liquid separator is connected to the branch circuit via a pipeline to form connection point two. Connection point two is located between the electronic expansion valve one and the external evaporator. The electronic expansion valve two is installed on the pipeline connecting the bottom of the gas-liquid separator one to the branch circuit.

2. The ejector-type gas replenishment and enthalpy enhancement system with an economizer according to claim 1, characterized in that, The closed-loop refrigeration system consists of a compressor, a reversing valve, an external evaporator, an electronic expansion valve I, an internal condenser, a reversing valve, a gas-liquid condenser II, and the compressor connected in sequence; the exhaust port of the internal condenser is connected to the inlet of the gas-liquid separator II through the reversing valve.

3. The ejector-type gas replenishment and enthalpy enhancement system with an economizer according to claim 2, characterized in that, The reversing valve is a four-way reversing valve.

4. The ejector-type gas replenishment and enthalpy enhancement system with an economizer according to claim 1, characterized in that, The air inlet and exhaust outlet of the gas-liquid separator are both located above the maximum liquid level line that is restricted inside the gas-liquid separator.

5. The ejector-type gas replenishment and enthalpy enhancement system with an economizer according to claim 1, characterized in that, The air inlet and exhaust outlet of the gas-liquid separator are both located above the maximum liquid level line that is restricted inside the gas-liquid separator.

6. The ejector-type gas replenishment and enthalpy enhancement system with an economizer according to claim 1, characterized in that, The reversing valve is a four-way reversing valve.

7. The ejector-type gas replenishment and enthalpy enhancement system with an economizer according to claim 1, characterized in that, Both electronic expansion valve one and electronic expansion valve two are throttling and pressure-reducing expansion valves.

8. The ejector-type gas replenishment and enthalpy enhancement system with an economizer according to claim 1, characterized in that, Solenoid valve 1, solenoid valve 2, electronic expansion valve 1, electronic expansion valve 2, and directional valve are all controlled by a controller to open and close the valves.

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