Air-supplementing enthalpy-increasing heat pump system

Abstract

The invention discloses an air-supplementing and enthalpy-increasing heat pump system. The air-supplementing and enthalpy-increasing heat pump system comprises a compressor, a four-way valve, a condenser, a flash tank and an evaporator, the flash tank is connected with the compressor based on a first pipeline; the four-way valve communicates with the condenser based on a second pipeline and communicates with the evaporator based on a third pipeline; the first pipeline comprises a first branch pipeline, a second branch pipeline and a first capillary tube, the input ends of the first branch pipeline and the second branch pipeline are both connected with one end of the first capillary tube, and the other end of the first capillary tube is communicated with an air outlet of the flash tank; the other end of the first branch pipeline communicates with an enthalpy spraying opening of the compressor, and a first one-way valve only allowing gas to pass through is arranged on the first branch pipeline. The other end of the second branch pipeline is communicated with the middle area of the third pipeline, and a second one-way valve through which only gas passes is arranged on the second branch pipeline. By simplifying the system control logic, the phenomenon of middle pressure instability is avoided, the continuity of the gas supply process and the stability of system operation are improved, and the system cost and the maintenance difficulty are reduced.

Description

Technical Field

[0001] This invention relates to the field of refrigeration and air conditioning technology, and in particular to a gas-replenishing enthalpy-increasing heat pump system. Background Technology

[0002] In a conventional two-stage throttling flash enthalpy-increasing heat pump system, such as... Figure 1 The diagram shows that two independent throttling devices are typically used to perform staged pressure reduction of the refrigerant. A flash evaporator is installed between the two throttling devices to achieve gas-liquid separation, thereby separating medium-pressure gas for compressor replenishment and enthalpy increase, aiming to improve the overall energy efficiency of the system.

[0003] However, such systems generally rely on dual electronic expansion valves as throttling devices. The intermediate pressure inside the flash evaporator is controlled by precisely adjusting the opening of the two expansion valves to obtain optimal refrigerant pressure parameters. This control strategy results in highly complex system operating logic, requiring real-time monitoring and dynamic adjustment of multiple variables. It is highly susceptible to intermediate pressure instability when external ambient temperature fluctuates or load changes occur. Pressure instability not only causes discontinuity in the compressor refrigerant supply process but may also induce compressor overload, abnormal refrigerant flow fluctuations, and other problems, thereby disrupting the stability of the entire heat pump cycle and increasing the risk of system failure. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art. This invention provides a gas-injection enthalpy-increasing heat pump system, which avoids intermediate pressure instability by simplifying the system control logic, improves the continuity of the gas injection process and the stability of system operation, and reduces system cost and maintenance difficulty.

[0005] Accordingly, the present invention proposes a gas-injection enthalpy-increasing heat pump system, which includes: a compressor, a four-way valve, a condenser, a flash evaporator, and an evaporator;

[0006] The flash generator is connected to the compressor via a first pipeline. The exhaust port of the compressor is connected to one of the four connection ports of the four-way valve, and the intake port of the compressor is connected to the other of the four connection ports of the four-way valve.

[0007] The four-way valve is connected to the condenser via a second pipeline, and the four-way valve is connected to the evaporator via a third pipeline;

[0008] The first pipeline includes a first branch pipeline, a second branch pipeline, and a first capillary tube. The input ends of the first branch pipeline and the second branch pipeline are both connected to one end of the first capillary tube, and the other end of the first capillary tube is connected to the air outlet of the flash generator.

[0009] The other end of the first branch pipeline is connected to the enthalpy injection port of the compressor, and the first branch pipeline is equipped with a first one-way valve that allows only gas to pass through.

[0010] The other end of the second branch pipe is connected to the middle area of ​​the third pipe, and the second branch pipe is equipped with a second one-way valve that allows only gas to pass through.

[0011] In some embodiments, the inlet of the first one-way valve is connected to the outlet of the flash evaporator via the first capillary tube, and the outlet of the first one-way valve is connected to the compressor.

[0012] In some embodiments, the inlet of the second one-way valve is connected to the outlet of the flash evaporator via the first capillary, and the outlet of the second one-way valve is connected to the third pipeline.

[0013] In some embodiments, the flash evaporator is connected to the evaporator via a fourth conduit, and the fourth conduit is provided with an adjustable flow valve.

[0014] In some embodiments, the adjustable flow valve is an electronic expansion valve.

[0015] In some embodiments, the flash evaporator is connected to the condenser via a fifth conduit, and a second capillary is provided at one end of the fifth conduit near the flash evaporator.

[0016] In some embodiments, the length of the first capillary is D1, and the length of the second capillary is D2, wherein D1 ≤ D2.

[0017] In some embodiments, the inner diameter of the first capillary is R1, and the inner diameter of the second capillary is R2, wherein R1 ≥ R2.

[0018] In some embodiments, a four-way valve solenoid coil is provided inside the four-way valve.

[0019] In some embodiments, one end of the first conduit is connected to the gas region inside the flash generator.

[0020] The beneficial effects of this invention are:

[0021] This invention, by setting a second capillary tube and using a fixed throttling method instead of an electronic expansion valve, avoids the need for dynamic adjustment and significantly reduces control complexity. Furthermore, this invention includes a first capillary tube, a first one-way valve, and a second one-way valve. The synergistic effect of these components ensures the unidirectional and pure flow of gas, preventing the risk of liquid slugging caused by liquid refrigerant entering the compressor. By reducing the need for an electronic expansion valve, this heat pump system becomes less expensive, simpler to control, and more reliable. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the gas-injection enthalpy-increasing heat pump system in this invention.

[0024] In the attached diagram, 100 is the compressor; 200 is the four-way valve; 300 is the condenser; 400 is the flash evaporator; 500 is the evaporator; 1 is the first pipeline; 11 is the first branch pipeline; 111 is the first check valve; 12 is the second branch pipeline; 121 is the second check valve; 13 is the first capillary tube; 2 is the second pipeline; 3 is the third pipeline; 4 is the fourth pipeline; 41 is the adjustable flow valve; 5 is the fifth pipeline; and 51 is the second capillary tube. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Figure 1The diagram illustrates the structural principle of the gas-injection enthalpy-increasing heat pump system of the present invention. The system includes: a compressor 100, a four-way valve 200, a condenser 300, a flash evaporator 400, and an evaporator 500. The flash evaporator 400 is connected to the compressor 100 via a first pipeline 1. The exhaust port of the compressor 100 is connected to one of the four connection ports of the four-way valve 200, and the suction port of the compressor 100 is connected to the other four connection ports of the four-way valve 200. The four-way valve 200 is connected to the condenser 300 via a second pipeline 2, and the four-way valve 200 is connected to the evaporator 500 via a third pipeline 3. The first pipeline 1 includes a first branch pipeline 11, a second branch pipeline 12, and a first capillary tube 13. The input ends of the first branch pipeline 11 and the second branch pipeline 12 are both connected to one end of the first capillary tube 13, and the other end of the first capillary tube 13 is connected to the outlet of the flash evaporator 400. The other end of the first branch pipeline 11 is connected to the enthalpy injection port of the compressor 100, and a first one-way valve 111 that only allows gas to pass through is provided on the first branch pipeline 11. The other end of the second branch pipeline 12 is connected to the middle area of ​​the third pipeline 3, and a second one-way valve 121 that only allows gas to pass through is provided on the second branch pipeline 12. The flash evaporator 400 is connected to the compressor 100 through the first pipeline 1. The exhaust port and the intake port of the compressor 100 are respectively connected to the two connection ports of the four-way valve 200. The four-way valve 200 is connected to the condenser 300 through the second pipeline 2 and to the evaporator 500 through the third pipeline 3. The first pipeline 1 is divided into a first branch pipeline 11, a second branch pipeline 12, and a first capillary tube 13. One end of the first capillary tube 13 is connected to the outlet of the flash evaporator 400, and the other end branches into the input ends of the first branch pipeline 11 and the second branch pipeline 12. The output end of the first branch pipeline 11 is connected to the enthalpy injection port of the compressor 100, and a first one-way valve 111 that only allows gas to pass through is provided on the first branch pipeline 11. The output end of the second branch pipeline 12 is connected to the middle area of ​​the third pipeline 3, and a second one-way valve 121 that only allows gas to pass through is provided on the second branch pipeline 12. During the system's heating mode operation, refrigerant flows into the flash evaporator 400 for gas-liquid separation. The separated gas undergoes fixed throttling and pressure reduction through the first capillary tube 13. The throttled gas then enters the enthalpy injection port of the compressor 100 through the first one-way valve 111, achieving the function of gas replenishment and enthalpy increase. Since the second capillary tube 51 uses a fixed throttling method instead of an electronic expansion valve, the need for dynamic adjustment is avoided, significantly reducing the control complexity. At the same time, the synergistic effect of the first one-way valve 111 and the second one-way valve 121 ensures the unidirectionality and purity of the gas flow, preventing the risk of liquid slugging caused by liquid refrigerant entering the compressor 100. With the reduction of electronic expansion valves, the heat pump system is made to be lower in cost, simpler to control, and more reliable.

[0027] It should be noted that when the system is in heating mode, the gas separated by the flash evaporator 400 is throttled and depressurized by the first capillary tube 13, and then stably fed into the compressor 100 through the first one-way valve 111, improving heating capacity and energy efficiency ratio. In cooling mode, the second one-way valve 121 automatically directs excess gas to the outlet side of the evaporator 500, preventing the gas replenishment function from interfering with the main cycle. Simultaneously, the pure liquid refrigerant in the flash evaporator 400 provides a stable input for the subsequent throttling device. The fixed throttling of the second capillary tube 51 eliminates the complex control links of the electronic expansion valve, simplifying the control system structure. The one-way conduction characteristic of the first one-way valve 111 ensures the purity of the replenished gas, effectively avoiding the risk of liquid slugging in the compressor 100 and improving operational reliability. Furthermore, the organic combination of these features enables the system to reliably activate and deactivate the gas replenishment enthalpy-increasing function without complex electronic control, fundamentally solving the problem of complex control that easily degrades system stability, and ensuring the stable and efficient operation of the heat pump system under different operating conditions.

[0028] Specifically, the inlet of the first one-way valve 111 is connected to the outlet of the flash evaporator 400 via the first capillary tube 13, and the outlet of the first one-way valve 111 is connected to the compressor 100. The inlet of the first one-way valve 111 is connected to the output end of the first capillary tube, and the outlet of the flash evaporator 400 is connected to the input end of the first capillary tube 13. That is, during normal system operation, gas enters the first capillary tube 13 through the gas outlet of the flash evaporator 400. Due to the throttling and pressure reduction effect of the first capillary tube 13, the gas will generate a certain pressure drop when passing through the first capillary tube 13. When there is a tendency for a large amount of liquid to enter the compressor enthalpy nozzle in the flash evaporator 400, the density of the liquid is much greater than that of the gas, and it will encounter greater resistance when passing through the first capillary tube 13. At the same time, the throttling effect of the first capillary tube 13 causes a change in the pressure distribution in the pipeline, forming a pressure buffer zone between the gas outlet of the flash evaporator 400 and the compressor enthalpy nozzle. When liquid attempts to enter in large quantities, this pressure buffer zone prevents the rapid flow of liquid, thus effectively isolating the liquid within the flash generator 400.

[0029] It should be noted that the first one-way valve 111 is a valve device that allows only unidirectional gas flow. It can be implemented using a spring-loaded check valve, a ball valve, or a diaphragm valve. Its purpose is to ensure that gas flows unidirectionally from the flash evaporator 400 to the compressor 100. The outlet of the flash evaporator 400 refers to the interface area inside the flash evaporator 400 specifically used to output pure gas after gas-liquid separation. It can be designed as the outlet of the gas accumulation area at the top of the flash evaporator 400. Its purpose is to provide a high-purity gas flow and prevent insufficiently separated droplets from mixing into the flow path. By strictly limiting the inlet of the first one-way valve 111 to the outlet of the flash evaporator 400, it is ensured that the gas flow source comes only from the pure gas area after gas-liquid separation, thereby avoiding the risk of liquid mixing due to unclear connection points. At the same time, by directly connecting the outlet of the first one-way valve 111 to the enthalpy injection port of the compressor 100, the gas flow path is precisely matched to the process requirements of the compressor 100 for gas replenishment and enthalpy enhancement. Since the physical location of the outlet of the flash evaporator 400 is dedicated to outputting separated gas, this design fundamentally isolates the possibility of liquid intrusion; while the one-way conduction characteristic of the first one-way valve 111 effectively suppresses the reverse flow caused by pressure fluctuations during the operation of the compressor 100. The two work together to ensure the timing accuracy and path reliability of the gas flow, thereby optimizing the thermodynamic cycle efficiency.

[0030] Specifically, the inlet of the second one-way valve 121 is connected to the outlet of the first capillary tube 13 and the flash evaporator 400, and the outlet of the second one-way valve 121 is connected to the third pipeline 3. By directly connecting the inlet of the second one-way valve 121 to the outlet of the flash evaporator 400, it is ensured that the pure gas separated from the flash evaporator 400 can only flow into the one-way valve in one direction. Since the outlet of the flash evaporator 400 only outputs gaseous working fluid, interference from liquid or mixed working fluids is avoided, thereby maintaining the dryness and pressure stability of the gas. At the same time, connecting the outlet of the second one-way valve 121 to the third pipeline 3... This directs the gas to the evaporator 500 side, enhancing evaporation efficiency. When the four-way valve 200 switches operating modes, it effectively blocks the path of gas flowing back into the flash evaporator 400 from the third pipe 3, ensuring the reliability of the gas replenishment path. Overall, the precise layout of the physical one-way valve simplifies the reliance on complex electronic control and effectively prevents refrigerant from flowing back into the flash evaporator 400 from the third pipe 3, ensuring the stability of the gas-liquid separation process inside the flash evaporator 400 and avoiding gas replenishment pressure fluctuations. This improves the operational reliability and overall energy efficiency of the gas replenishment enthalpy-increasing heat pump system under varying operating conditions.

[0031] It should be noted that the second check valve 121 refers to a control element that only allows gas to flow in one direction. It can be implemented using a spring-loaded check valve or a ball valve. Its purpose is to ensure strict limitation of the gas flow direction and avoid system disturbance caused by reverse flow. The outlet of the flash evaporator 400 refers to the interface area inside the flash evaporator 400 specifically used for outputting the separated pure gas. It can be implemented using a flange connection or a welded interface. Its purpose is to provide a stable output channel for dry gas. The third pipeline 3 refers to the working fluid flow path connecting the four-way valve 200 and the evaporator 500. It can be implemented using copper or stainless steel pipes. Its purpose is to serve as the working fluid transmission channel in the evaporation cycle stage.

[0032] Specifically, the flash evaporator 400 is connected to the evaporator 500 via a fourth pipe 4, and an adjustable flow valve 41 is provided on the fourth pipe 4. The fourth pipe 4 is a dedicated channel connecting the flash evaporator 400 and the evaporator 500 for transmitting liquid refrigerant. It can be made of materials such as copper or stainless steel, and its purpose is to ensure that the separated liquid phase can flow to the evaporator 500 in a timely manner to participate in the evaporation process, avoiding liquid accumulation that could interfere with the pressure balance within the flash evaporator 400. The adjustable flow valve 41 is a throttling device that can dynamically adjust its opening according to system operating conditions. It can be implemented using a thermostatic expansion valve, a mechanical regulating valve, or a stepper motor-driven regulating valve. Its purpose is to precisely control the refrigerant flow rate in real time by responding to fluctuations in ambient temperature or changes in load to maintain a stable intermediate pressure within the flash evaporator 400.

[0033] It should be noted that a directional flow path for the liquid refrigerant from the flash evaporator 400 to the evaporator 500 is constructed through the fourth pipeline 4, allowing the liquid phase after gas-liquid separation to directly participate in the evaporation cycle. At the same time, the adjustable flow valve 41 dynamically adjusts its opening based on real-time system operating condition feedback, forming a flow control closed loop. This stabilizes the intermediate pressure within the flash evaporator 400, ensuring that the pressure and temperature of the make-up gas meet the requirements of the compressor 100 injection enthalpy port, reducing pressure fluctuations caused by flow mismatch, and enhancing the adaptability of the heat pump system under varying operating conditions.

[0034] Specifically, the adjustable flow valve 41 is an electronic expansion valve. An electronic expansion valve is a throttling device that can dynamically adjust its opening according to the real-time operating conditions of the system. It can be implemented using a valve core structure driven by a stepper motor or a valve body driven by an electromagnetic motor. Its purpose is to provide precise flow control to ensure the stability of the gas-liquid separation process within the flash evaporator 400, avoiding the shortcomings of fixed throttling devices that cannot adapt to load fluctuations due to their fixed structure. Specifically, the solution in this application uses an electronic expansion valve to monitor the temperature and pressure parameters at the outlet of the flash evaporator 400 in real time and dynamically adjust its opening to control the refrigerant flow from the flash evaporator 400 to the condenser 300, thereby stabilizing the intermediate pressure within the flash evaporator 400, ensuring the gas-liquid separation process remains effective, providing reliable medium-pressure gas replenishment to the compressor 100, avoiding the risk of system oscillation caused by flow fluctuations, effectively maintaining the stability of the intermediate pressure of gas-liquid separation within the flash evaporator 400, reducing pressure fluctuations during operation, and thus improving the enthalpy increase effect of gas replenishment and overall energy efficiency.

[0035] Specifically, the flash evaporator 400 is connected to the condenser 300 via a fifth pipe 5, and a second capillary tube 51 is provided at one end of the fifth pipe 5 near the flash evaporator 400. The fifth pipe 5 refers to the fluid channel connecting the flash evaporator 400 and the condenser 300, which can be made of pressure-resistant materials such as copper or stainless steel pipes. Its purpose is to provide a stable fluid path to avoid pressure regulation delay caused by indirect connection. The second capillary tube 51 is a fixed throttling device, which can be implemented using capillary tubes or orifice plates. The implementation principle of the second capillary tube 51 is similar to that of the first capillary tube. Its purpose is to achieve precise pressure reduction through physical throttling, avoiding intermediate pressure fluctuations caused by reliance on electronic control components during the regulation process of high-pressure liquid refrigerant. This improves the operational reliability of the heat pump system under varying operating conditions and ensures that the refrigerant pressure and phase change process entering the flash evaporator 400 are simpler and more controllable. Specifically, the fifth pipe 5 establishes a direct connection between the flash evaporator 400 and the condenser 300. In heating mode, the compressor discharges gas, which then passes through the third pipe 3, the evaporator, and the adjustable flow valve before entering the flash evaporator 400. The refrigerant in the flash evaporator 400 then passes through the second capillary tube 51 into the fifth pipe 5. After entering the fifth pipe 5, the refrigerant passes through the condenser and the second pipe before finally entering the compressor's suction port. During this process, the second capillary tube 51 further throttles and reduces the pressure of the refrigerant, achieving a two-stage throttling and pressure reduction by the adjustable flow valve 41 and the second capillary tube 51. Simultaneously, the gas separated from the flash evaporator 400 undergoes fixed throttling and pressure reduction via the first capillary tube 13. The throttled gas then enters the compressor 100's enthalpy injection port through the first one-way valve 111, achieving the function of replenishing gas and increasing enthalpy. The second capillary tube 51 effectively simplifies the refrigerant flow control logic. That is, by using the second capillary tube 51 instead of the adjustable flow valve, the intermediate pressure fluctuations caused by the reliance on electronic control components during the adjustment process of high-pressure liquid refrigerant are avoided, thereby improving the operational reliability of the heat pump system under varying operating conditions.

[0036] Specifically, the length of the first capillary tube 13 is D1, and the length of the second capillary tube 51 is D2, wherein D1 ≤ D2. By connecting the first capillary tube 13 to the outlet of the flash evaporator 400 to handle the gas replenishment path, and simultaneously placing the second capillary tube 51 near the end of the fifth pipeline 5 near the flash evaporator 400 to handle the liquid throttling path, and setting the length relationship of D1 ≤ D2, the gas undergoes a gentle throttling process in the shorter first capillary tube 13, effectively reducing the flow resistance of compressible gas, avoiding insufficient replenishment flow, and thus ensuring the compressor's performance. The enthalpy increase effect is 100%. The liquid undergoes a sufficient throttling process in the longer second capillary tube 51, and the high density characteristics of the incompressible liquid provide a stable expansion space. This prevents pressure fluctuations in the flash evaporator 400 caused by insufficient throttling, and ultimately achieves independent optimization of the gas and liquid throttling paths. This ensures that the heat pump system maintains a highly efficient and stable gas replenishment enthalpy increase process under varying operating conditions, effectively avoids intermediate pressure fluctuations caused by capillary length mismatch, stabilizes the gas-liquid separation process in the flash evaporator 400, and improves the operational reliability and energy efficiency stability of the gas replenishment enthalpy increase heat pump system.

[0037] Specifically, the inner diameter of the first capillary tube 13 is R1, and the inner diameter of the second capillary tube 51 is R2, where R1 ≥ R2. By limiting the inner diameters R1 and R2 of the first capillary tube 51 to a relationship of R1 ≥ R2, the throttling effect of the gas supply path can be adaptively maintained within a reasonable range during the operation of the heat pump system. Since the inner diameter R1 of the first capillary tube is not less than the inner diameter R2 of the second capillary tube 51, the instability of the compressor 100 caused by a sudden drop in gas supply flow and pressure due to the smaller inner diameter is effectively avoided, which is beneficial to stabilizing the state of the compressor 100. Based on this, the medium-pressure gas flow provided by the flash evaporator 400 is stabilized, thereby ensuring the continuous and efficient operation of the compressor 100 under varying operating conditions. This effectively solves the problem of abnormal fluctuations in gas supply flow caused by the excessively small inner diameter of the first capillary tube 13, ensuring the stability of the compressor 100 operation and optimizing the energy efficiency performance of the system under varying operating conditions.

[0038] Specifically, the four-way valve 200 is equipped with a four-way valve 200 electromagnetic coil. This can be implemented using a solenoid structure or a linear electromagnetic actuator. Its purpose is to directly drive the valve core to move via electromagnetic force, thereby achieving rapid switching of the flow path of the four-way valve 200. The four-way valve 200 electromagnetic coil can be understood as a conversion component that converts electrical energy into mechanical motion. Specifically, it can be composed of copper wire windings and ferromagnetic materials. Its purpose is to provide precise and controllable driving force, avoiding the response delay introduced by external linkage mechanisms or manual operation in traditional mechanical switching. When the heat pump system needs to switch between cooling and heating modes, the control system applies an electrical signal to the solenoid coil of the four-way valve 200. After the solenoid coil is energized, it generates a magnetic field that acts on the valve core, driving the valve core to move along a predetermined trajectory to the target position, thereby changing the flow direction of the refrigerant between the compressor 100, condenser 300, and evaporator 500. Since the electromagnetic drive process does not require external mechanical transmission components, and the response time for the establishment and disappearance of the magnetic field is extremely short, the immediacy and accuracy of the valve core position switching are ensured, effectively preventing system pressure imbalance or flow interruption caused by switching delay.

[0039] Specifically, one end of the first pipe 1 is connected to the gas region inside the flash generator 400. The gas region inside the flash generator 400 refers to the part where pure gas accumulates after gas-liquid separation inside the flash generator 400. It can be achieved by setting a gas intake port at the top of the flash generator 400 or by extending to the gas layer through an internal conduit. The purpose is to ensure that the fluid entering the first pipe 1 is pure gas and to avoid liquid mixing that could cause liquid slugging in the compressor 100. The first pipe 1 refers to the fluid channel connecting the flash generator 400 and the enthalpy nozzle of the compressor 100. It can be a rigid metal pipe or a flexible pressure-resistant hose. The purpose is to precisely guide the gas flow to a designated location and provide a stable gas source for enthalpy enhancement. During system operation, the gas-liquid separation effect within the flash evaporator 400 depends on the accuracy of the gas intake location. When the first pipeline 1 is connected to the corresponding gas area inside the flash evaporator 400, the purity of the gas flow is ensured, making the gas replenishment and enthalpy increase process more stable. At the same time, this connection method works effectively with the gas-liquid separation function of the flash evaporator 400, preventing liquid from entering the first branch pipeline 11 and the second branch pipeline 12 with the gas flow. This prevents liquid from entering the compressor 100 enthalpy nozzle or the third pipeline 3 through the first one-way valve 111 or the second one-way valve 121, effectively avoiding the risk of liquid impact inside the compressor 100 and preventing the occurrence of liquid slugging in the compressor 100, thereby improving the operational reliability and stability of the heat pump system.

[0040] In summary, this invention, by incorporating a second capillary tube and replacing the electronic expansion valve with a fixed throttling method, avoids the need for dynamic adjustment and significantly reduces control complexity. Furthermore, this invention incorporates a first capillary tube, a first one-way valve, and a second one-way valve. The synergistic effect of these components ensures the unidirectional flow and purity of the gas, preventing the risk of liquid slugging caused by liquid refrigerant entering the compressor. By reducing the need for an electronic expansion valve, this heat pump system achieves lower costs, simpler control, and higher reliability.

[0041] Furthermore, the above provides a detailed description of the gas-injection enthalpy-increasing heat pump system provided in the embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A gas-replenishing enthalpy-increasing heat pump system, characterized in that, The gas-injection enthalpy-increasing heat pump system includes: a compressor, a four-way valve, a condenser, a flash evaporator, and an evaporator; The flash generator is connected to the compressor via a first pipeline. The exhaust port of the compressor is connected to one of the four connection ports of the four-way valve, and the intake port of the compressor is connected to the other of the four connection ports of the four-way valve. The four-way valve is connected to the condenser via a second pipeline, and the four-way valve is connected to the evaporator via a third pipeline; The first pipeline includes a first branch pipeline, a second branch pipeline, and a first capillary tube. The input ends of the first branch pipeline and the second branch pipeline are both connected to one end of the first capillary tube, and the other end of the first capillary tube is connected to the air outlet of the flash generator. The other end of the first branch pipeline is connected to the enthalpy injection port of the compressor, and the first branch pipeline is equipped with a first one-way valve that allows only gas to pass through. The other end of the second branch pipe is connected to the middle area of ​​the third pipe, and the second branch pipe is equipped with a second one-way valve that allows only gas to pass through.

2. The gas-replenishing enthalpy-increasing heat pump system according to claim 1, characterized in that, The inlet of the first one-way valve is connected to the outlet of the flash evaporator via the first capillary tube, and the outlet of the first one-way valve is connected to the compressor.

3. The gas-replenishing enthalpy-increasing heat pump system according to claim 1, characterized in that, The inlet of the second one-way valve is connected to the outlet of the flash evaporator via the first capillary tube, and the outlet of the second one-way valve is connected to the third pipeline.

4. The gas-replenishing enthalpy-increasing heat pump system according to claim 1, characterized in that, The flash evaporator is connected to the evaporator via a fourth pipe, and an adjustable flow valve is provided on the fourth pipe.

5. The gas-replenishing enthalpy-increasing heat pump system according to claim 4, characterized in that, The adjustable flow valve is an electronic expansion valve.

6. The gas-replenishing enthalpy-increasing heat pump system according to claim 1, characterized in that, The flash evaporator is connected to the condenser via a fifth pipe, and a second capillary is provided at one end of the fifth pipe near the flash evaporator.

7. The gas-replenishing enthalpy-increasing heat pump system according to claim 6, characterized in that, The length of the first capillary is D1, and the length of the second capillary is D2, wherein D1 ≤ D2.

8. The gas-replenishing enthalpy-increasing heat pump system according to claim 7, characterized in that, The inner diameter of the first capillary is R1, and the inner diameter of the second capillary is R2, where R1 ≥ R2.

9. The gas-replenishing enthalpy-increasing heat pump system according to claim 1, characterized in that, The four-way valve is equipped with a four-way valve solenoid coil.

10. The gas-replenishing enthalpy-increasing heat pump system according to claim 1, characterized in that, One end of the first pipeline is connected to the gas region inside the flash generator.

Images