A bypass energy-saving liquid cooling device

Abstract

This utility model relates to a bypass energy-saving liquid cooling device. The compressor exhaust of a compression refrigeration unit is split into two or more paths, each connected to two or more parallel condensers via two or more condensing control valves. The two or more condensers are then connected to the plate heat exchanger compressor side via two or more condensing check valves and a liquid receiver. The plate heat exchanger load side is connected to a return liquid pipe and a supply liquid pipe. The return liquid pipe, returning liquid from the load, passes sequentially through a return liquid temperature sensor, a return liquid pressure sensor, a water tank, an expansion tank, and a water pump before splitting into two paths: one path connects to the plate heat exchanger load side, and the other path directly supplies liquid via a capillary tube connected in parallel with the plate heat exchanger load side. The supply liquid pipe, originating from the plate heat exchanger load side, merges with the capillary tube and then connects to the load via a heater, a supply liquid pressure sensor, and a supply liquid temperature sensor. By controlling the condensing control valves to switch between different condensers or simultaneously operate multiple condensers, the device ensures energy saving and safe and stable operation of the compression refrigeration system while meeting fluctuating cooling demand.

Description

Technical Field

[0001] This utility model relates to liquid cooling technology, specifically a bypass energy-saving liquid cooling device. Background Technology

[0002] In existing liquid cooling systems for compression refrigeration, the control of refrigeration load is mostly achieved by compressor frequency conversion or refrigerant bypass regulation. The variable frequency compressor's energy control is only suitable for small and medium-sized units, and the non-continuous step-by-step regulation causes obvious vibration. Refrigerant bypass regulation has problems such as reduced energy efficiency ratio and increased vibration, and is also only suitable for small and medium-sized units. When used in large power units, it is easy to cause insufficient cooling capacity. In addition, there are also potential problems such as liquid slugging and lubricating oil aging. Summary of the Invention

[0003] This invention provides a bypass energy-saving liquid cooling device with a simple structure that can meet the energy-saving control requirements of high-power cooling.

[0004] The technical solution adopted in this utility model is: a bypass energy-saving liquid cooling device, including a compressor refrigeration unit and a plate heat exchanger, characterized in that: the compressor exhaust of the compressor refrigeration unit is divided into two or more paths, which are respectively connected to two or more parallel condensers through two or more condensing control valves. The two or more condensers are respectively connected to the compressor side of the plate heat exchanger through two or more condensing check valves and then to the liquid storage tank. The two or more condensers share a fan. The load side of the plate heat exchanger is respectively connected to a return liquid pipe and a supply liquid pipe. The return liquid pipe returns liquid from the load in sequence through a return liquid temperature sensor, a return liquid pressure sensor, a water tank, an expansion tank, and a water pump, and then splits into two paths. One path is connected to the load side of the plate heat exchanger, and the other path is directly connected to the supply liquid pipe through a capillary tube connected in parallel with the load side of the plate heat exchanger. The supply liquid pipe is connected from the load side of the plate heat exchanger and merged with the capillary tube, and then connected to the load through a heater, a supply liquid pressure sensor, and a supply liquid temperature sensor.

[0005] The water tank is connected to the return pipe in sequence via a filter, a water supply pump, and a water supply check valve.

[0006] The expansion tank is connected to the return liquid pipe via a ball valve.

[0007] An air vent valve is also provided after the water pump.

[0008] The heater is a PTC pipeline heater.

[0009] The compressor refrigeration unit also includes an exhaust temperature sensor, an exhaust pressure sensor, a dryer filter, an electronic expansion valve, a gas-liquid separator, an intake temperature sensor, and an intake pressure sensor. The exhaust temperature sensor and exhaust pressure sensor are connected to the compressor exhaust port. Two or more condensers are connected together and then connected to the plate heat exchanger compressor side inlet via a liquid receiver, a dryer filter, and an electronic expansion valve. The plate heat exchanger compressor side outlet is connected back to the compressor via a gas-liquid separator, an intake temperature sensor, and an intake pressure sensor.

[0010] A filling valve is installed after the gas-liquid separator.

[0011] The return pipe branches off into an external pipe before the return temperature sensor, and an external control valve is installed on the external pipe.

[0012] The two or more condensers may have the same or different heat exchange capabilities.

[0013] The beneficial effects of this utility model are as follows: When the cooling demand of the load fluctuates, different condensers can be switched or multiple condensers can be turned on simultaneously by controlling the condensing control valve to increase the cooling capacity of the compressor. There is no need to control the compressor frequency converter or bypass the refrigerant. When adapting to the fluctuation of cooling demand, it ensures energy saving of compression refrigeration. The liquid receiver is set in front of the electronic expansion valve and combined with the charging valve of the compressor suction port to store refrigerant to ensure the stability of the circulation volume. High cooling demand can be met by water tank replenishment, expansion tank buffer pressure compensation and water pump pressurization. The capillary tube is connected in parallel on the load side of the plate heat exchanger to effectively prevent the pressure fluctuation on the compression side from being transmitted to the load, thereby improving the stability and safety of the load. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; In the diagram: 1. Compressor; 2. Discharge pressure sensor; 3. Discharge temperature sensor; 4. Condensation control valve; 5. Condenser; 6. Fan; 7. Condensation check valve; 8. Receiver; 9. Dryer filter; 10. Electronic expansion valve; 11. Plate heat exchanger; 12. Gas-liquid separator; 13. Charging valve; 14. Suction temperature sensor; 15. Suction pressure sensor; 16. Return liquid pipe; 17. Return liquid temperature sensor; 18. Return liquid pressure sensor; 19. Water tank; 20. Filter; 21. Makeup water pump; 22. Makeup water check valve; 23. Expansion tank; 24. Water pump; 25. Exhaust valve; 26. Capillary tube; 27. PTC pipeline heater; 28. Supply liquid pressure sensor; 29. ​​Supply liquid temperature sensor; 30. Supply liquid pipe. Detailed Implementation

[0015] The following explanation, in conjunction with the accompanying drawings, will provide further details.

[0016] Figure 1As shown: A bypass energy-saving liquid cooling device includes a compressor 1, an exhaust pressure sensor 2, an exhaust temperature sensor 3, a condensing control valve 4, a condenser 5, a fan 6, a condensing check valve 7, a liquid receiver 8, a dryer filter 9, an electronic expansion valve 10, a plate heat exchanger 11, a gas-liquid separator 12, a charging valve 13, an intake temperature sensor 14, an intake pressure sensor 15, a return pipe 16, a return liquid temperature sensor 17, a return liquid pressure sensor 18, a water tank 19, a filter 20, a water supply pump 21, a water supply check valve 22, an expansion tank 23, a water pump 24, an exhaust valve 25, a capillary tube 26, a PTC pipeline heater 27, a liquid supply pressure sensor 28, a liquid supply temperature sensor 29, and a liquid supply pipe 30.

[0017] The exhaust gas from compressor 1 of the refrigeration unit is split into two paths after passing through exhaust pressure sensor 2 and exhaust temperature sensor 3. Each path is equipped with a condenser control valve 4, a condenser 5, and a condenser check valve 7 in sequence. The condensers 5 of the two paths share a fan 6. After the two paths are connected together, they pass through a liquid receiver 8, a dryer filter 9, and an electronic expansion valve 10 to the compressor side inlet of plate heat exchanger 11. The compressor side outlet of plate heat exchanger 11 passes through a gas-liquid separator 12, a charging valve 13, a suction temperature sensor 14, and a suction pressure sensor 15 in sequence to return to compressor 1.

[0018] The load side of the heat exchanger 11 is connected to a return pipe 16 and a supply pipe 30. The return pipe 16 returns liquid from the load and passes through the return liquid temperature sensor 17, the return liquid pressure sensor 18, the water tank 19, the expansion tank 23, the water pump 24, and the exhaust valve 25 in sequence before splitting into two paths. One path connects to the load side of the heat exchanger 11, and the other path goes directly to the supply pipe 30 through the capillary tube 26 connected in parallel with the load side of the heat exchanger 11. The supply pipe 30 is connected from the load side of the heat exchanger 11 and merges with the capillary tube 26, and then passes through the PTC pipeline heater 27, the supply liquid pressure sensor 28, and the supply liquid temperature sensor 29 before connecting to the load.

[0019] In this embodiment, the water tank 19 is connected to the return pipe 16 via the filter 20, the water supply pump 21, and the water supply check valve 22 in sequence. In the prior art, a level switch, sight glass, vent valve, and water filling and drainage structures can also be installed on the water tank.

[0020] In this embodiment, the expansion tank is connected to the return liquid pipe via a ball valve.

[0021] Based on this embodiment, an external pipeline can be branched off from the return liquid pipe before the return liquid temperature sensor, and an external control valve can be installed on the external pipeline.

[0022] Based on this embodiment, the heat exchange capacity of two or more condensers can be designed to be the same or different. They can be used individually or in combination, depending on the heat exchange capacity, to meet energy-saving requirements with large variations in cooling capacity.

Claims

1. A bypass energy-saving liquid cooling device, comprising a compressor refrigeration unit and a plate heat exchanger, characterized in that: The compressor exhaust of the refrigeration unit is divided into two or more paths, which are connected to two or more parallel condensers via two or more condensing control valves. The two or more condensers are connected to the compressor side of the plate heat exchanger via two or more condensing check valves and then to the liquid receiver. The two or more condensers share a fan. The load side of the plate heat exchanger is connected to a return liquid pipe and a supply liquid pipe. The return liquid pipe returns liquid from the load and passes through a return liquid temperature sensor, a return liquid pressure sensor, a water tank, an expansion tank, and a water pump in sequence before splitting into two paths. One path connects to the load side of the plate heat exchanger, and the other path goes directly to the supply liquid pipe via a capillary tube connected in parallel with the load side of the plate heat exchanger. The supply liquid pipe is connected from the load side of the plate heat exchanger and merged with the capillary tube, then connects to the load via a heater, a supply liquid pressure sensor, and a supply liquid temperature sensor.

2. The bypass energy-saving liquid cooling device according to claim 1, characterized in that: The water tank is connected to the return pipe in sequence via a filter, a water supply pump, and a water supply check valve.

3. The bypass energy-saving liquid cooling device according to claim 1, characterized in that: The expansion tank is connected to the return liquid pipe via a ball valve.

4. The bypass energy-saving liquid cooling device according to claim 1, characterized in that: An air vent valve is also provided after the water pump.

5. The bypass energy-saving liquid cooling device according to claim 1, characterized in that: The heater is a PTC pipeline heater.

6. The bypass energy-saving liquid cooling device according to claim 1, characterized in that: The compressor refrigeration unit also includes an exhaust temperature sensor, an exhaust pressure sensor, a dryer filter, an electronic expansion valve, a gas-liquid separator, an intake temperature sensor, and an intake pressure sensor. The exhaust temperature sensor and exhaust pressure sensor are connected to the compressor exhaust port. Two or more condensers are connected together and then connected to the plate heat exchanger compressor side inlet via a liquid receiver, a dryer filter, and an electronic expansion valve. The plate heat exchanger compressor side outlet is connected back to the compressor via a gas-liquid separator, an intake temperature sensor, and an intake pressure sensor.

7. A bypass energy-saving liquid cooling device according to claim 6, characterized in that: A filling valve is installed after the gas-liquid separator.

8. The bypass energy-saving liquid cooling device according to claim 1, characterized in that: The return pipe branches off into an external pipe before the return temperature sensor, and an external control valve is installed on the external pipe.

9. A bypass energy-saving liquid cooling device according to claim 1, characterized in that: The two or more condensers may have the same or different heat exchange capabilities.

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