High-pressure side bypass condensing pressure adjusting heat pump system

Abstract

The invention belongs to the field of heat pump systems, and particularly relates to a high-pressure side bypass condensing pressure adjusting heat pump system. The system is mainly composed of an evaporator, a condenser, a two-way thermostatic expansion valve, a four-way reversing valve, a compressor and bypass electromagnetic valves, the bypass electromagnetic valves are connected into the heat pump system in the mode that the bypass electromagnetic valves are connected with the evaporator and the condenser in parallel, and in the refrigerating mode and the heating mode, the bypass electromagnetic valves connected with the high-pressure side in parallel are opened, so that the heat pump system is heated. The bypass electromagnetic valves connected in parallel on the low-pressure side are closed, control over the condensing pressure on the high-pressure side is achieved, the condensing pressure on the high-pressure side is adjusted by adjusting the opening degree of the bypass electromagnetic valve on the high-pressure side and controlling the flow of refrigerant flowing through the condenser, unnecessary energy loss is avoided, and meanwhile the heat exchange efficiency of the condenser is improved to the maximum extent. And the heat pump system operates efficiently and stably.

Description

Technical Field

[0001] The invention relates to a high-pressure side bypass condensing pressure regulating heat pump system, belonging to the field of heat pump systems. Background Art

[0002] In the heat pump system, the refrigerant enters the high-pressure side through the compressor and then flows through the condenser for condensation and heat dissipation. However, in some special cases, such as when the ambient temperature is low or the cooling load is small, the condensation pressure may be too high. On the one hand, the excessive condensation pressure will cause the compressor to operate under high-load conditions, increase its workload, and reduce the service life of the compressor. On the other hand, it will lead to poor system performance and reduced energy efficiency. By installing a high-pressure side bypass solenoid valve to adjust the flow of liquid refrigerant through the condenser, the condensation pressure in the condenser can be reduced, and the heat dissipation efficiency and stability of the system can be improved.

[0003] At present, some patents have proposed solutions for regulating the condensing pressure of the system. Patent CN109186153B uses a proportional valve to reduce the water flow rate of the condenser water inlet pipeline to increase the water temperature, that is, the condensing temperature, so as to ensure that the condensing pressure is within a suitable range. However, the control accuracy and adjustment range of the proportional valve are limited, and the proportional valve increases the condensing temperature by limiting the condensing flow rate, which may cause partial energy loss and reduce energy efficiency. Patent CN102032704B uses a compressor speed detection device to detect the speed of the compressor, and then uses a target subcooling value extraction device to select and extract a pre-stored target subcooling value according to the condensing pressure and the speed of the compressor. In addition, a subcooling value calculation device is used to calculate the subcooling value of the refrigerant circuit. Finally, the control device is used to adjust the opening of the electronic expansion valve so that the calculated subcooling value of the refrigerant circuit reaches the target subcooling value, thereby intelligently and efficiently controlling the stable operation of the heat pump device. However, the system involves many devices, and the initial cost, the accuracy of each device in operation, and the subsequent maintenance are extremely complex, and it is not suitable for heat pump devices in all scenarios.

[0004] The present invention proposes a high-pressure side bypass heat pump system for regulating condensing pressure, a bypass solenoid valve is connected in parallel next to the high-pressure side heat exchanger after the system compressor, and the heat pump system switches the cooling and heating modes according to seasonal requirements through a four-way reversing valve. In both cooling and heating modes, the bypass solenoid valve in parallel on the condensing side is opened, and by adjusting the opening of the bypass solenoid valve, refrigerant in excess of the condensing load bypasses the condensing heat exchanger and directly enters the evaporating heat exchanger, thereby adjusting the pressure on the condensing side and reducing the condensing heat dissipation, so that the heat pump system operates stably and efficiently. Summary of the invention

[0005] The present invention proposes a high-pressure side bypass condensing pressure regulating heat pump system, which helps to regulate the condensing heat dissipation of the heat pump system, reduce the condensing pressure, and improve the energy efficiency and stability of the system operation.

[0006] The embodiment of the present application provides a high-pressure side bypass condensing pressure regulating heat pump system, which is composed of an evaporator 1, a drying filter 2, a two-way thermal expansion valve 3, a condenser 4, a four-way reversing valve 5, a needle valve 6, a gas-liquid separator 7, a low-pressure switch 8, a low-pressure meter 9, a compressor 10, a high-pressure switch 11, a high-pressure meter 12, a stop valve 13 and a bypass solenoid valve 14;

[0007] The evaporator 1 comprises a first port 1-a and a second port 1-b, the filter dryer 2 comprises a first filter dryer 2-1 and a second filter dryer 2-2, the first filter dryer 2-1 has a first port 2-1-a and a second port 2-1-b, the second filter dryer 2-2 has a first port 2-2-a and a second port 2-2-b, the two-way thermal expansion valve 3 comprises a first port 3-a and a second port 3-b, and the condenser 4 comprises a first port 4-a and a second port 4-b;

[0008] The first port 2-1-a of the first filter dryer 2-1 is connected to the first port 1-a of the evaporator 1 through a pipeline, the second port 2-1-b of the first filter dryer 2-1 is connected to the first port 3-a of the two-way thermal expansion valve 3 through a pipeline, the first port 2-2-a of the second filter dryer 2-2 is connected to the second port 3-b of the two-way thermal expansion valve 3 through a pipeline, and the second port of the second filter dryer 2-2 is connected to the first port 4-a of the condenser 4 through a pipeline 2-2-b;

[0009] The four-way reversing valve 5 comprises a first channel port 5-C, a second channel port 5-S, a third channel port 5-D and a fourth channel port 5-E, the first channel port 5-C is connected to the second port 4-b of the condenser 4 through a pipeline, the second channel port 5-S is connected to the inlet of the gas-liquid separator 7 through a pipeline, the outlet of the gas-liquid separator 7 is connected to the inlet of the compressor 10 through a pipeline, the outlet of the compressor 10 is connected to the third channel port 5-D of the four-way reversing valve 5 through a pipeline, and the fourth channel port 5-E is connected to the second port 1-b of the evaporator 1 through a pipeline;

[0010] The needle valve 6 comprises a first needle valve 6-1 and a second needle valve 6-2, wherein the first needle valve 6-1 is arranged on a pipeline between the fourth channel port 5-S of the four-way reversing valve and the inlet of the gas-liquid separator 7, and the second needle valve 6-2 is arranged on a pipeline between the outlet of the compressor 10 and the second channel port 5-D of the four-way reversing valve;

[0011] The low-pressure switch 8 and the low-pressure gauge 9 are sequentially arranged on the pipeline between the outlet of the gas-liquid separator 7 and the inlet of the compressor 10, the high-pressure switch 11 and the high-pressure gauge 12 are sequentially arranged on the pipeline between the outlet of the compressor 10 and the third channel port 5-D of the four-way reversing valve 5, and the stop valve 13 is arranged on the pipeline between the fourth channel port 5-E of the four-way reversing valve 5 and the second port 1-b of the evaporator 1;

[0012] The bypass solenoid valve 14 includes a first bypass solenoid valve 14-1 and a second bypass solenoid valve 14-2. The first bypass solenoid valve 14-1 is connected in parallel with the evaporator 1. The first bypass solenoid valve has a first port 14-1-a and a second port 14-1-b. The first port 14-1-a is connected to the second port 1-b of the evaporator 1 through a pipeline, and the second port 14-2-b is connected to the first port 2-1-a of the first drying filter 2-1 through a pipeline. The second bypass solenoid valve 14-2 has a first port 14-2-a and a second port 14-2-b. The first port 14-2-a is connected to the second port 4-b of the condenser 4 through a pipeline, and the second port 14-2-b is connected to the second port 2-2-b of the second drying filter 2-2 through a pipeline.

[0013] Furthermore, the first filter drier 2 - 1 and the second filter drier 2 - 2 are symmetrically arranged in the pipeline with respect to the bidirectional thermal expansion valve 3 .

[0014] Furthermore, in the refrigeration mode, the first port 1-a of the evaporator 1 is the inlet of the refrigerant, and the second port 1-b is the outlet of the refrigerant, the first port 2-1-a of the first drying filter 2-1 is the outlet of the refrigerant, and the second port 2-1-b is the inlet of the refrigerant, the first port 3-a of the two-way thermal expansion valve 3 is the outlet of the refrigerant, and the second port 3-b is the inlet of the refrigerant, the first port 2-2-a of the second drying filter 2-2 is the outlet of the refrigerant, and the second port 2-2-b is the inlet of the refrigerant, and the first port 4-a of the condenser 4 is the outlet of the refrigerant, and the second port 4-b is the inlet of the refrigerant.

[0015] Furthermore, in the heating mode, the first port 1-a of the evaporator 1 is the refrigerant outlet, and the second port 1-b is the refrigerant inlet, the first port 2-1-a of the first drying filter 2-1 is the refrigerant inlet, and the second port 2-1-b is the refrigerant outlet, the first port 3-a of the two-way thermal expansion valve 3 is the refrigerant inlet, and the second port 3-b is the refrigerant outlet, the first port 2-2-a of the second drying filter 2-2 is the refrigerant inlet, and the second port 2-2-b is the refrigerant outlet, the first port 4-a of the condenser 4 is the refrigerant inlet, and the second port 4-b is the refrigerant outlet.

[0016] Furthermore, in the cooling mode, the first channel port 5-C of the four-way reversing valve 5 is the refrigerant outflow port, and the fourth channel port 5-E is the refrigerant inflow port, while in the heating mode, the first channel port 5-C of the four-way reversing valve 5 is the refrigerant inflow port, and the fourth channel port 5-E is the refrigerant outflow port. Regardless of the cooling mode or the heating mode, the second channel port 5-S of the four-way reversing valve 5 is the refrigerant outflow port, and the refrigerant flows out from the second channel port 5-S and then flows into the gas-liquid separator 7. The third channel port 5-D of the four-way reversing valve 5 is the refrigerant inflow port, and the refrigerant flowing out of the compressor 10 flows into the four-way reversing valve 5 from the third channel port 5-D.

[0017] Furthermore, the system switches between the cooling mode and the heating mode through the four-way reversing valve 5. In the cooling mode, the four-way reversing valve 5 connects the ES channel and the DC channel, and the refrigerant that absorbs heat and evaporates from the indoor room is diverted from the evaporator 1 to the compressor 10, and then to the condenser 4, and releases heat to the outdoors to achieve a cooling effect. In the heating mode, the four-way reversing valve connects the CS channel and the DE channel, and the refrigerant that takes heat from the outdoors is diverted from the condenser 4 to the compressor 10, and then to the evaporator 1, and releases heat to the indoor room to achieve a heating effect.

[0018] Furthermore, the low-pressure switch 8 is used to monitor and control the low-pressure state between the gas-liquid separator 7 and the compressor 10. When the system pressure drops below a predetermined low-pressure threshold, the low-pressure switch 8 will be triggered and disconnect the circuit, thereby stopping the operation of the compressor. The low-pressure meter 9 is used to monitor the low-pressure value of the suction pipe of the compressor 10. The high-pressure switch 11 is used to monitor and control the high-pressure state after the compressor 10. When the system pressure rises above a predetermined high-pressure threshold, the high-pressure switch 11 will be triggered and disconnect the circuit, thereby stopping the operation of the compressor. The high-pressure meter 12 is used to monitor the high-pressure value of the exhaust pipe of the compressor 10.

[0019] Furthermore, the first bypass solenoid valve 14-2 and the second bypass solenoid valve 14-2 play a diversion role in this system. By controlling the switching state and opening degree of the first bypass solenoid valve 14-2 and the second bypass solenoid valve 14-2, the refrigerant flow rate flowing through the evaporator 1 and the condenser 4 can be adjusted, thereby adjusting the heat dissipation of the condenser. In the cooling mode, the first bypass solenoid valve 14-1 is closed and the second bypass solenoid valve 14-2 is opened, so that part of the refrigerant bypasses the condenser 4 and flows directly back to the evaporator 1, thereby reducing the workload and heat dissipation of the condenser 4. In the heating mode, the first bypass solenoid valve 14-1 is opened and the second bypass solenoid valve 14-2 is closed, so that part of the refrigerant bypasses the evaporator 1 and flows directly back to the condenser 4, thereby reducing the condensation pressure and reducing the heat dissipation of the condensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attached Figure 1 Schematic diagram of a heat pump system with high-pressure side bypass to regulate the condensing pressure.

[0021] The markings in the accompanying drawings are: 1. Evaporator, 1-a. First port of evaporator, 1-b. Second port of evaporator, 2-1. First filter dryer, 2-1-a. First port of first filter dryer, 2-1-b. Second port of first filter dryer, 2-2. Second filter dryer, 2-2-a. First port of second filter dryer, 2-2-b. Second port of second filter dryer, 3. Two-way thermal expansion valve, 3-a. First port of two-way thermal expansion valve, 3-b. Second port of two-way thermal expansion valve, 4. Condenser, 4-a. First port of condenser, 4-b. Second port of condenser, 5. Four-way Reversing valve, 5-C, first channel port, 5-S, second channel port, 5-D, third channel port, 5-E, fourth channel port, 6-1, first needle valve, 6-2, second needle valve, 7, gas-liquid separator, 8, low-pressure switch, 9, low-pressure gauge, 10, compressor, 11, high-pressure switch, 12, high-pressure gauge, 13, stop valve, 14-1, first bypass solenoid valve, 14-1-a, first port of the first bypass solenoid valve, 14-1-b, second port of the first bypass solenoid valve, 14-2, second bypass solenoid valve, 14-2-a, first port of the second bypass solenoid valve, 14-2-b, second port of the second bypass solenoid valve. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] A high-pressure side bypass condensing pressure regulating heat pump system, comprising an evaporator 1, a drying filter 2, a two-way thermal expansion valve 3, a condenser 4, a four-way reversing valve 5, a needle valve 6, a gas-liquid separator 7, a low-pressure switch 8, a low-pressure gauge 9, a compressor 10, a high-pressure switch 11, a high-pressure gauge 12, a stop valve 13 and a bypass solenoid valve 14;

[0024] In the cooling mode, the stop valve 13 is opened, the first bypass solenoid valve 14-1 is closed, and the second bypass solenoid valve 14-2 is opened. The cooling starts, and the refrigerant enters the evaporator 1 in a low-temperature and low-pressure liquid state, absorbs indoor heat and evaporates into gas, and then enters the gas-liquid separator 7 through the ES channel opened by the four-way reversing valve 5. The gas-liquid separator 7 separates the liquid in the gaseous refrigerant. Then the low-temperature and low-pressure gaseous refrigerant is sucked into the compressor 10 and compressed into a high-pressure and high-temperature gas. A part of the high-pressure and high-temperature gas enters the condenser 4 through the DC channel opened by the four-way reversing valve 5, and a part of it bypasses the condenser 4 and flows directly to the second bypass solenoid valve 14-2, and flows out directly through the second bypass solenoid valve 14-2. At the same time, the high-temperature and high-pressure gaseous refrigerant flowing to the condenser 4 is condensed into liquid refrigerant. Subsequently, the refrigerant flowing out of the second bypass solenoid valve 14-2 and the condenser 4 is collected and enters the second drying filter 2-2. The refrigerant filtered of impurities and moisture by the second drying filter 2-2 enters After the two-way thermal expansion valve 3, through the throttling effect of the two-way thermal expansion valve 3, the pressure and temperature of the refrigerant are further reduced and become a low-temperature and low-pressure liquid refrigerant. Then the first drying filter 2-1 filters the residual impurities in the liquid refrigerant. Finally, the low-temperature and low-pressure liquid refrigerant returns to the evaporator 1 again, absorbs indoor heat and evaporates into gas. Among them, the first needle valve 6-1, the second needle valve 6-2, the low-pressure switch 8, the low-pressure gauge 9, the high-pressure switch 11 and the high-pressure gauge 12 work together. When the value displayed by the low-pressure gauge 9 is not within the low-pressure threshold, the low-pressure switch 8 will trigger and disconnect the circuit. At this time, manually adjust the first needle valve 6-1 to adjust the low-pressure side flow. When the pressure returns to normal, the system flows into the compressor 10 to work normally. When the value displayed by the high-pressure gauge 12 is not within the high-pressure threshold, the high-pressure switch 11 will trigger and disconnect the circuit. At this time, manually adjust the first needle valve 6-2 to adjust the high-pressure side flow. When the pressure returns to normal, the system flows into the condenser 4 to work normally, and the cycle is repeated to achieve the cooling effect.

[0025] In the heating mode, the stop valve 13 is opened, the first bypass solenoid valve 14-1 is opened, and the second bypass solenoid valve 14-2 is closed. The refrigerant enters the condenser 4 in a low-temperature and low-pressure liquid state, absorbs outdoor heat and evaporates into gas, and then enters the gas-liquid separator 7 through the CS channel opened by the four-way reversing valve 5. The gas-liquid separator 7 separates the liquid in the gaseous refrigerant. Then the low-temperature and low-pressure gaseous refrigerant is sucked into the compressor 10 and compressed into a high-pressure and high-temperature gas. A part of the high-pressure and high-temperature gas bypasses the evaporator 1 and flows directly to the first bypass solenoid valve 14-1 through the DE channel opened by the four-way reversing valve 5, and flows out directly through the first bypass solenoid valve 14-1, and a part flows into the evaporator 1. The high-temperature and high-pressure gas exchanges heat with the indoor air, releases heat to the indoor room, and is converted into a low-temperature and low-pressure liquid refrigerant. Subsequently, the refrigerant flowing out of the first bypass solenoid valve 14-1 and the evaporator 1 is collected and enters the first drying filter 2-1, and is filtered by the first drying filter 2-1. After the refrigerant with impurities and moisture filtered out enters the two-way thermal expansion valve 3, it becomes a low-temperature and low-pressure liquid refrigerant through the throttling effect of the two-way thermal expansion valve 3. Then the second drying filter 2-2 filters out the residual impurities in the liquid refrigerant. Finally, the low-temperature and low-pressure liquid refrigerant flows into the condenser 4 again to absorb outdoor heat. Among them, the first needle valve 6-1, the second needle valve 6-2, the low-pressure switch 8, the low-pressure meter 9, the high-pressure switch 11 and the high-pressure meter 12 work together. When the value displayed by the low-pressure meter 9 is not within the low-pressure threshold, the low-pressure switch 8 will trigger and disconnect the circuit. At this time, manually adjust the first needle valve 6-1 to adjust the low-pressure side flow. When the pressure returns to normal, the system flows into the compressor 10 to work normally. When the value displayed by the high-pressure meter 12 is not within the high-pressure threshold, the high-pressure switch 11 will trigger and disconnect the circuit. At this time, manually adjust the first needle valve 6-2 to adjust the high-pressure side flow. When the pressure returns to normal, the system flows into the evaporator 1 to work normally, and the cycle is repeated to achieve the heating effect.

Claims

1. A high-pressure side bypass condensing pressure regulating heat pump system, characterized in that: It is composed of an evaporator (1), a drying filter (2), a two-way thermal expansion valve (3), a condenser (4), a four-way reversing valve (5), a needle valve (6), a gas-liquid separator (7), a low-pressure switch (8), a low-pressure gauge (9), a compressor (10), a high-pressure switch (11), a high-pressure gauge (12), a stop valve (13) and a bypass solenoid valve (14); The evaporator (1) comprises a first port (1-a) and a second port (1-b); the filter drier (2) comprises a first filter drier (2-1) and a second filter drier (2-2); the first filter drier (2-1) has a first port (2-1-a) and a second port (2-1-b); the second filter drier (2-2) has a first port (2-2-a) and a second port (2-2-b); the bidirectional thermal expansion valve (3) comprises a first port (3-a) and a second port (3-b); and the condenser (4) comprises a first port (4-a) and a second port (4-b); The first port (2-1-a) of the first filter drier (2-1) is connected to the first port (1-a) of the evaporator (1) through a pipeline, the second port (2-1-b) of the first filter drier (2-1) is connected to the first port (3-a) of the bidirectional thermal expansion valve (3) through a pipeline, the first port (2-2-a) of the second filter drier (2-2) is connected to the second port (3-b) of the bidirectional thermal expansion valve (3) through a pipeline, and the second port of the second filter drier (2-2) is connected to the first port (4-a) of the condenser (4) through a pipeline (2-2-b); The four-way reversing valve (5) comprises a first channel port (5-C), a second channel port (5-S), a third channel port (5-D) and a fourth channel port (5-E), the first channel port (5-C) being connected to the second port (4-b) of the condenser (4) via a pipeline, the second channel port (5-S) being connected to the inlet of the gas-liquid separator (7) via a pipeline, the outlet of the gas-liquid separator (7) being connected to the inlet of the compressor (10) via a pipeline, the outlet of the compressor (10) being connected to the third channel port (5-D) of the four-way reversing valve (5) via a pipeline, and the fourth channel port (5-E) being connected to the second port (1-b) of the evaporator (1) via a pipeline; The needle valve (6) comprises a first needle valve (6-1) and a second needle valve (6-2), wherein the first needle valve (6-1) is arranged on a pipeline between a fourth channel port (5-S) of the four-way reversing valve and an inlet of a gas-liquid separator (7), and the second needle valve (6-2) is arranged on a pipeline between an outlet of the compressor (10) and a second channel port (5-D) of the four-way reversing valve; The low-pressure switch (8) and the low-pressure gauge (9) are arranged in sequence on the pipeline between the outlet of the gas-liquid separator (7) and the inlet of the compressor (10); the high-pressure switch (11) and the high-pressure gauge (12) are arranged in sequence on the pipeline between the outlet of the compressor (10) and the third channel port (5-D) of the four-way reversing valve (5); and the stop valve (13) is arranged on the pipeline between the fourth channel port (5-E) of the four-way reversing valve (5) and the second port (1-b) of the evaporator (1); The bypass solenoid valve (14) comprises a first bypass solenoid valve (14-1) and a second bypass solenoid valve (14-2), wherein the first bypass solenoid valve (14-1) is connected in parallel with the evaporator (1), the first bypass solenoid valve has a first port (14-1-a) and a second port (14-1-b), the first port (14-1-a) is connected to the second port (1-b) of the evaporator (1) through a pipeline, the second port (14-2-b) is connected to the first port (2-1-a) of the first drying filter (2-1) through a pipeline, the second bypass solenoid valve (14-2) has a first port (14-2-a) and a second port (14-2-b), the first port (14-2-a) is connected to the second port (4-b) of the condenser (4) through a pipeline, and the second port (14-2-b) is connected to the second port (2-2-b) of the second drying filter (2-2) through a pipeline.

2. A high-pressure side bypass condensing pressure regulating heat pump system according to claim 1, characterized in that: The first drying filter (2-1) and the second drying filter (2-2) are symmetrically arranged in the pipeline with respect to the bidirectional thermal expansion valve (3).

3. A high-pressure side bypass condensing pressure regulating heat pump system according to claim 1, characterized in that: In the refrigeration mode, the first port (1-a) of the evaporator (1) is an inlet for the refrigerant, and the second port (1-b) is an outlet for the refrigerant; the first port (2-1-a) of the first drying filter (2-1) is an outlet for the refrigerant, and the second port (2-1-b) is an inlet for the refrigerant; the first port (3-a) of the two-way thermal expansion valve (3) is an outlet for the refrigerant, and the second port (3-b) is an inlet for the refrigerant; the first port (2-2-a) of the second drying filter (2-2) is an outlet for the refrigerant, and the second port (2-2-b) is an inlet for the refrigerant; the first port (4-a) of the condenser (4) is an outlet for the refrigerant, and the second port (4-b) is an inlet for the refrigerant.

4. A high-pressure side bypass condensing pressure regulating heat pump system according to claim 1, characterized in that: In the heating mode, the first port (1-a) of the evaporator (1) is the refrigerant flow outlet, and the second port (1-b) is the refrigerant flow inlet, the first port (2-1-a) of the first drying filter (2-1) is the refrigerant flow inlet, and the second port (2-1-b) is the refrigerant flow outlet, the first port (3-a) of the two-way thermal expansion valve (3) is the refrigerant flow inlet, and the second port (3-b) is the refrigerant flow outlet, the first port (2-2-a) of the second drying filter (2-2) is the refrigerant flow inlet, and the second port (2-2-b) is the refrigerant flow outlet, and the first port (4-a) of the condenser (4) is the refrigerant flow inlet, and the second port (4-b) is the refrigerant flow outlet.

5. A high-pressure side bypass condensing pressure regulating heat pump system according to claim 1, characterized in that: In the cooling mode, the first channel port (5-C) of the four-way reversing valve (5) is the refrigerant outflow port, and the fourth channel port (5-E) is the refrigerant inflow port. In the heating mode, the first channel port (5-C) of the four-way reversing valve (5) is the refrigerant inflow port, and the fourth channel port (5-E) is the refrigerant outflow port. Regardless of the cooling mode or the heating mode, the second channel port (5-S) of the four-way reversing valve (5) is the refrigerant outflow port, and the refrigerant flows out from the second channel port (5-S) and then flows into the gas-liquid separator (7). The third channel port (5-D) of the four-way reversing valve (5) is the refrigerant inflow port, and the refrigerant flowing out of the compressor (10) flows into the four-way reversing valve (5) from the third channel port (5-D).

6. A high-pressure side bypass condensing pressure regulating heat pump system according to claim 1, characterized in that: The system switches between the cooling mode and the heating mode by means of the four-way reversing valve (5). In the cooling mode, the four-way reversing valve (5) connects the ES channel and the DC channel, and guides the refrigerant that absorbs heat from the indoor space and evaporates from the evaporator (1) to the compressor (10), and then to the condenser (4), and releases heat to the outdoor space, thereby achieving a cooling effect. In the heating mode, the four-way reversing valve connects the CS channel and the DE channel, and guides the refrigerant that absorbs heat from the outdoor space from the condenser (4) to the compressor (10), and then to the evaporator (1), and releases heat to the indoor space, thereby achieving a heating effect.

7. A high-pressure side bypass condensing pressure regulating heat pump system according to claim 1, characterized in that: The low-pressure switch (8) is used to monitor and control the low-pressure state between the gas-liquid separator (7) and the compressor (10). When the pressure of the system drops below a predetermined low-pressure threshold, the low-pressure switch (8) will be triggered and disconnect the circuit, thereby stopping the operation of the compressor. The low-pressure meter (9) is used to monitor the low-pressure value of the suction pipe of the compressor (10). The high-pressure switch (11) is used to monitor and control the high-pressure state after the compressor (10). When the pressure of the system rises above a predetermined high-pressure threshold, the high-pressure switch (11) will be triggered and disconnect the circuit, thereby stopping the operation of the compressor. The high-pressure meter (12) is used to monitor the high-pressure value of the exhaust pipe of the compressor (10).

8. A high-pressure side bypass condensing pressure regulating heat pump system according to claim 1, characterized in that: The heat dissipation of the condenser is adjusted by controlling the switching states of the first bypass solenoid valve (14-2) and the second bypass solenoid valve (14-2). The first bypass solenoid valve (14-2) and the second bypass solenoid valve (14-2) play a diversion role in this system. The refrigerant flow rate flowing through the evaporator (1) and the condenser (4) can be adjusted by adjusting the opening degrees of the first bypass solenoid valve (14-2) and the second bypass solenoid valve (14-2). In the cooling mode, the first bypass solenoid valve (14-1) is closed and the second bypass solenoid valve (14-2) is opened, so that part of the refrigerant bypasses the condenser (4) and flows directly back to the evaporator (1), thereby reducing the workload and heat dissipation of the condenser (4). In the heating mode, the first bypass solenoid valve (14-1) is opened and the second bypass solenoid valve (14-2) is closed, so that part of the refrigerant bypasses the evaporator (1) and flows directly back to the condenser (4), thereby reducing the condensation pressure and reducing the heat dissipation of the condensation.

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