Two-phase cooling system for freon dryness control

Abstract

The utility model relates to a two-phase cooling system for freon dryness control, which is characterized in that a load return pipe is connected into a two-phase separator through a load, the two-phase separator is connected with a liquid storage tank through a condensed liquid outlet pipe after being supplied to an air-cooled condenser, a gaseous flow sensor is arranged on the condensed liquid outlet pipe, the liquid storage tank is connected out of a load inlet pipe, and a total flow sensor is arranged on the load inlet pipe; the total flow sensor is divided into two paths, one path is a refrigeration adjusting pipeline, a refrigeration adjusting valve, a heat exchange coil pipe and a one-way valve are sequentially arranged on the refrigeration adjusting pipeline, the heat exchange coil pipe is arranged in the lower liquid phase in the two-phase separator, the other path is sequentially provided with a pipe inlet valve to be connected out for liquid supply, and the refrigeration adjusting pipeline is connected behind the pipe inlet valve. By monitoring the energy consumption of the air-cooled condenser, calculating the dryness of Freon gas supplied to the air-cooled condenser through a gas state sensor and a total flow sensor, controlling the opening degree of a refrigeration regulating valve and supplying a liquid phase to a heat exchange coil in a two-phase separator through a refrigeration regulating pipeline, the energy conservation of the air-cooled condenser is facilitated, and the energy efficiency ratio is high.

Description

Technical Field

[0001] This utility model relates to a cooling system, specifically a two-phase cooling system with Freon dryness control. Background Technology

[0002] In existing cooling systems with Freon refrigeration loads, the Freon return gas is a wet return gas, which contains both gas and liquid phases. The two-phase return gas is directly sent to the condenser. According to the traditional design concept, in order to ensure gas delivery and liquid discharge, the air-cooled condenser usually adopts a bottom air inlet structure. This can easily cause the liquid phase to settle and block the air inlet, affecting the refrigeration operation and heat exchange efficiency. In addition, even if the two phases are separated before being sent to the condenser, if the Freon dryness is insufficient after separation, it will still cause the condenser load energy consumption to increase, affecting the energy efficiency ratio of the cooling system. Summary of the Invention

[0003] This invention provides a two-phase cooling system with simple structure that can effectively ensure stable operation and heat exchange efficiency by controlling the dryness of Freon.

[0004] The technical solution adopted in this utility model is: a two-phase cooling system for Freon dryness control, including a load return pipe, a load inlet pipe, and an air-cooled condenser. The load return pipe is connected to a two-phase separator via a load inlet, a return pipe temperature sensor, and a return pipe pressure sensor. The gas phase of the two-phase separator is connected to the high-point inlet of the air-cooled condenser via a gas phase pressure sensor and a gas phase temperature sensor. The low-point outlet of the air-cooled condenser is connected to the liquid inlet pipe of a liquid storage tank via a condensate outlet pipe. A condensate outlet temperature sensor, a condensate outlet pressure sensor, and a gas flow sensor are sequentially installed on the condensate outlet pipe. A liquid storage temperature sensor and a liquid storage pressure sensor are sequentially installed on the liquid storage inlet pipe. The bottom of the two-phase separator... A liquid phase bypass is connected to the liquid phase inlet pipe. A shut-off valve, a check valve, and a bypass pump are sequentially installed on the liquid phase bypass pipe. An electric heating belt is installed on the liquid storage tank. The liquid storage tank is connected to the load inlet pipe. A dryer filter, a magnetic pump, a pump post-pump temperature sensor, a pump post-pump pressure sensor, and a total flow sensor are sequentially installed on the load inlet pipe. Two paths branch off from the total flow sensor. One path is a refrigeration regulation line, which is sequentially equipped with a refrigeration regulation valve, a heat exchange coil, and a check valve. The heat exchange coil is placed in the lower liquid phase inside the two-phase separator. The other path is sequentially equipped with an inlet valve, an inlet temperature sensor, and an inlet pressure sensor. The refrigeration regulation line is connected between the inlet valve and the inlet temperature sensor.

[0005] An auxiliary electric heater, a liquid supply temperature sensor, and a liquid supply pressure sensor are sequentially installed after the inlet pipe pressure sensor.

[0006] The load inlet pipe is provided with a bypass branch after the magnetic pump, and the bypass branch is returned to the storage tank via a one-way shut-off valve.

[0007] The bypass branch is set up as one or more.

[0008] The beneficial effects of this utility model are:

[0009] 1. The Freon gas-liquid coexisting two phases in the load return pipe are sent to the two-phase separator for separation. The gas phase is sent to the high point inlet of the air-cooled condenser, while the residual liquid phase is sent directly down and sent out from the low point outlet. This also drives the liquid phase after heat exchange and condensation of the gas phase to move down, which helps to ensure the condensing energy efficiency ratio and avoids the problem of liquid phase accumulation and blockage of the gas phase caused by the low point inlet, resulting in a low condensing energy efficiency ratio.

[0010] 2. The liquid phase separated by the two-phase separator does not require a blower-cooled condenser and can be directly sent out of the liquid pipe or into the load pipe, which helps to improve the energy efficiency ratio.

[0011] 3. An electric heating belt is installed on the liquid storage tank, and an auxiliary electric heater is installed after the magnetic pump. The structure of the two ensures accurate liquid supply temperature under load.

[0012] 4. By monitoring the energy consumption of the air-cooled condenser, the dryness of the Freon gas in the air-cooled condenser can be calculated using gas flow sensors and total flow sensors. This allows for control of the opening of the refrigeration regulating valve, which sends the liquid phase through the refrigeration regulating pipeline to the heat exchange coil in the two-phase separator. This improves the separation effect of the gas-liquid coexisting phases in the load return pipe, ensures the dryness of the Freon gas, contributes to the energy saving of the air-cooled condenser, and has a high energy efficiency ratio.

[0013] 5. A bypass branch is set after the magnetic pump in the load inlet pipe, which can return the liquid to the storage tank, meet the needs of liquid supply bypass and pump depressurization, and improve the system's energy efficiency ratio and safety. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] In the diagram: 1. Load return pipe; 2. Return pipe temperature sensor; 3. Return pipe pressure sensor; 4. Two-phase separator; 5. Gas phase pressure sensor; 6. Gas phase temperature sensor; 7. Air-cooled condenser; 8. Condensate outlet pipe; 9. Condensate outlet temperature sensor; 10. Condensate outlet pressure sensor; 11. Gas flow sensor; 12. Liquid storage inlet pipe; 13. Liquid storage temperature sensor; 14. Liquid storage pressure sensor; 15. Liquid phase bypass; 16. Shut-off valve; 17. Check valve; 18. Bypass pump; 19. Check valve; 20. Liquid storage tank; 21. Electric heating belt; 22. Load inlet pipe; 23. Dryer filter; 24. Magnetic pump; 25. Pump post-pump temperature sensor; 26. Pump post-pump pressure sensor; 27. Total flow sensor; 28. Inlet pipe valve; 29. ​​Inlet pipe temperature sensor; 30. Inlet pipe pressure sensor; 31. Refrigeration regulating pipe; 32. Refrigeration regulating valve; 33. Heat exchange coil; 34. Check valve; 35. Auxiliary electric heater; 36. Supply liquid temperature sensor; 37. Supply liquid pressure sensor; 38. Bypass branch. Detailed Implementation

[0016] The following explanation, in conjunction with the accompanying drawings, will provide further details.

[0017] Figure 1 As shown: A two-phase cooling system with Freon dryness control includes a load return pipe 1, a two-phase separator 4, a liquid storage tank 20, a load inlet pipe 22, and an air-cooled condenser 8. The load return pipe 1 is connected to the load in sequence via the return pipe temperature sensor 2 and the return pipe pressure sensor 4 to the two-phase separator 4. The gas phase of the two-phase separator 4 is connected to the high point inlet of the air-cooled condenser 7 via the gas phase pressure sensor 5 and the gas phase temperature sensor 6. The low point outlet of the air-cooled condenser 7 is connected to the liquid storage inlet pipe 12 of the liquid storage tank 20 via the condensate outlet pipe 8. The condensate outlet pipe 8 is equipped with the condensate outlet temperature sensor 9, the condensate outlet pressure sensor 10 and the gas flow sensor 11 in sequence. The liquid storage inlet pipe 12 is equipped with the liquid storage temperature sensor 13 and the liquid storage pressure sensor 14 in sequence. The bottom liquid phase of the two-phase separator 4 is connected to the liquid phase bypass passage 15. The liquid phase bypass passage 15 is equipped with the shut-off valve 16, the one-way valve 17 and the bypass pump 18 in sequence. The one-way shut-off valve 19 is connected in parallel to the bypass pump 18. An electric heating belt 21 is installed on the liquid storage tank 20. The liquid storage tank 20 is connected to the load inlet pipe 22. A dryer filter 23, a magnetic pump 24, a pump post-temperature sensor 25, a pump post-pressure sensor 26, and a total flow sensor 27 are installed sequentially on the load inlet pipe 22. The total flow sensor 27 splits into two paths. One path is a refrigeration regulating pipe 31. A refrigeration regulating valve 32, a heat exchange coil 33, and a one-way valve 34 are installed sequentially on the refrigeration regulating pipe 31. The heat exchange coil 33 is placed in the lower liquid phase inside the two-phase separator 7. The other path is an inlet valve 28, an inlet temperature sensor 29, and an inlet pressure sensor 30 are installed sequentially. The refrigeration regulating pipe 31 is connected between the inlet valve and the inlet temperature sensor.

[0018] In this embodiment, an auxiliary electric heater 35, a liquid supply temperature sensor 36, and a liquid supply pressure sensor 37 are sequentially arranged after the inlet pipe pressure sensor 30.

[0019] In this embodiment, the load inlet pipe 22 is provided with one or more parallel bypass branches 38 after the magnetic pump 24, and the bypass branches are returned to the storage tank 20 via a one-way shut-off valve.

[0020] Based on this embodiment, check valves and / or shut-off valves can be installed on the pipelines connecting each pipe and each device. The shut-off valves can be electrically controlled. Flow sensors, temperature and pressure sensors can also be installed on the pipelines connecting each pipe and each device to improve the safety and accuracy of system control. This technology is a conventional technology in existing air conditioning technology and will not be described in detail in this application.

Claims

1. A two-phase cooling system for freon charge control comprising a load return tube, a load inlet tube and an air cooled condenser, characterized in that: The load return pipe is connected to the load access in sequence through a return pipe temperature sensor, a return pipe pressure sensor, a two-phase separator, a gas phase of the two-phase separator connected in sequence through a gas phase pressure sensor, a gas phase temperature sensor, a high point inlet of the air-cooled condenser, a low point outlet of the air-cooled condenser connected to a condensate outlet pipe, a storage liquid inlet pipe of a storage liquid tank, a condensate outlet pipe provided with a condensate outlet temperature sensor, a condensate outlet pressure sensor and a gaseous flow sensor in sequence, a storage liquid inlet pipe provided with a storage liquid temperature sensor and a storage liquid pressure sensor in sequence, a bottom liquid phase of the two-phase separator connected to a liquid phase bypass pipe, the liquid phase bypass pipe connected to the storage liquid inlet pipe, the liquid phase bypass pipe provided with a stop valve, a one-way valve and a bypass pump in sequence, the storage liquid tank provided with an electric heating belt, the storage liquid tank connected to a load inlet pipe, the load inlet pipe provided with a drying filter, a magnetic pump, a post-pump temperature sensor, a post-pump pressure sensor and a total flow sensor in sequence, the total flow sensor divided into two paths, one path being a refrigeration adjustment pipeline provided with a refrigeration adjustment valve, a heat exchange coil and a one-way valve in sequence, the heat exchange coil arranged in the lower liquid phase of the two-phase separator, and the other path provided with an inlet pipe valve, an inlet pipe temperature sensor and an inlet pipe pressure sensor in sequence, the refrigeration adjustment pipeline connected between the inlet pipe valve and the inlet pipe temperature sensor.

2. A two-phase cooling system for controlling the freon charge according to claim 1, characterized in that: The inlet pipe pressure sensor is provided with an auxiliary electric heater, a liquid supply temperature sensor and a liquid supply pressure sensor in sequence.

3. A two-phase cooling system for controlling the freon charge according to claim 1, characterized in that: The load inlet pipe is provided with a bypass branch after the magnetic pump, the bypass branch connected to the storage liquid tank through a one-way stop valve.

4. A two-phase cooling system for controlling the freon charge according to claim 3, characterized in that: The bypass branch is provided with more than one path.

5. A two-phase cooling system for controlling the freon charge according to claim 1, characterized in that: The bypass pump is connected in parallel with a one-way stop valve.

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