A new type of refrigeration dual-machine cold refrigeration device

Abstract

This utility model relates to a novel dual-unit refrigeration device, comprising two sets of compressor refrigeration units. Each compressor refrigeration unit supplies cooling fans to multiple refrigeration compartments. Each cooling fan is connected to an evaporator coil in a buffer zone corresponding to that compartment. The evaporator coils in the buffer zones are connected to a common return gas manifold. The return gas manifold splits into three paths: two paths connect to the gas-liquid separators of the two compressor refrigeration units and then to the compressor return gas inlet; the third path, via an adjustable pipeline with an adjustable valve, supplies cooling fans to the condensers of the two compressor refrigeration units. The compressors of the two compressor refrigeration units are horizontally aligned, and the bottoms of the crankcases of the two compressors are connected by a horizontally positioned oil balance pipe. An electric high-pressure ball valve is installed in the middle of the oil balance pipe. The dual-compressor refrigeration unit design provides stable performance and significantly improves the efficiency of dual-unit refrigeration.

Description

Technical Field

[0001] This utility model relates to a refrigeration device, specifically a novel dual-machine refrigeration device. Background Technology

[0002] In some cold storage facilities and large cold storage units, traditional single-compressor refrigeration systems face efficiency bottlenecks when dealing with high loads or extreme temperature environments. Under high loads, energy consumption increases dramatically, and cooling speed is limited. They are also susceptible to environmental temperature fluctuations, exhibiting poor environmental adaptability, low refrigeration efficiency, and high energy consumption. Furthermore, in existing refrigeration systems employing dual compressors (one on standby and one running simultaneously), the individual operating conditions of the two compressors differ, leading to inconsistent compressor wear and power consumption. When both compressors are running simultaneously, differences in refrigeration efficiency and performance result in minimal efficiency gains from dual-compressor operation. Summary of the Invention

[0003] This invention provides a novel dual-machine cooling refrigeration device with a simple structure, stable collaborative performance, and significantly improved dual-machine cooling efficiency.

[0004] The technical solution adopted by this utility model is: a novel dual-unit refrigeration device, comprising two sets of compression refrigeration units, each compression refrigeration unit including a compressor, an oil separator, a condenser, a liquid receiver, and a gas-liquid separator. The exhaust ports of the compressors of the two sets of compression refrigeration units sequentially pass through the oil separator, the condenser, and the liquid receiver, and then merge into three paths. Two of these paths are respectively connected to the return gas ports of the compressors of two or more sets of compression refrigeration units via bypass pipes with bypass valves. The third path supplies air coolers to multiple refrigeration compartments. The characteristic feature is that each... Each refrigerator compartment's air cooler is connected to an evaporator coil in the corresponding buffer zone. The evaporator coils in multiple buffer zones are connected to a return gas manifold. The return gas manifold is then split into three paths. Two paths are connected to the gas-liquid separators of two sets of compressor refrigeration units and then to the compressor return gas inlet. The third path is sent to the condensers of the two sets of compressor refrigeration units via an adjustable pipeline with an adjustable valve. The compressors of the two sets of compressor refrigeration units are arranged horizontally, and the bottom of the crankcases of the two compressors are connected by a horizontally arranged oil balance pipe. An electric high-pressure ball valve is installed in the middle of the oil balance pipe.

[0005] The oil at the bottom of the oil separator is connected to the pipeline after the gas-liquid separator of the respective compressor refrigeration unit or to the compressor return port.

[0006] Each set of compressor refrigeration units is equipped with a dryer filter, a liquid inlet, and a liquid level sight glass after the liquid receiver.

[0007] The compressor's exhaust port is connected to a high-pressure gauge, a high / low pressure controller, or a high-pressure switch, while the compressor's return port is connected to a low-pressure gauge, a high / low pressure controller, or a low-pressure switch.

[0008] An expansion valve is installed after the bypass valve in the bypass pipeline.

[0009] The temperature sensing element of the expansion valve is connected to the pipeline between the gas-liquid separator and the compressor return port.

[0010] The oil balance pipe is equipped with a quick-connect fitting.

[0011] The quick-connector is installed at either end of the electric high-pressure ball valve or two quick-connectors are installed at both ends of the electric high-pressure ball valve.

[0012] The beneficial effects of this utility model are as follows: An oil balance pipe connects the bottom of the compressor crankcase of two sets of refrigeration units, utilizing gravity and pressure difference to drive the flow of lubricating oil. Combined with the electric high-pressure ball valve in the middle of the oil balance pipe, backflow of lubricating oil is prevented during single-unit operation. This comprehensively ensures that the lubrication performance and working performance of the compressors of the two sets of refrigeration units are consistent. Furthermore, combined with the control of bypass and adjustable pipelines, the synergy and efficiency are significantly improved during dual-unit operation. Quick-connect couplings can be used for charging and discharging lubricating oil, and external filters can be connected to clean the lubricating oil. When the two sets of refrigeration units supply load, the cold storage room's air cooler is supplied first to meet the higher refrigeration power requirements. Then, the air cooler sends the lubricating oil through the buffer room's evaporator coil to cool the buffer room connecting the external environment and the cold storage room. This results in high energy utilization, and the cooling of the buffer room helps improve the refrigeration efficiency of the cold storage room. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the present invention.

[0014] In the diagram: 1. Compressor; 2. Oil separator; 3. Condenser; 4. Receiver; 5. Dryer filter; 6. Liquid inlet; 7. Liquid level sight glass; 8. Bypass line; 9. Bypass valve; 10. Refrigeration compartment; 11. Air cooler; 12. Buffer room; 13. Evaporator coil; 14. Gas return manifold; 15. Gas-liquid separator; 16. Adjustable line; 17. Adjustable valve; 18. Oil balance line; 19. Electric high-pressure ball valve; 20. Expansion valve; 21. Quick-connect coupling. Detailed Implementation

[0015] The following description, in conjunction with the accompanying drawings and embodiments, provides further details.

[0016] Figure 1The following describes a novel dual-unit refrigeration system, comprising two sets of compressor refrigeration units. The exhaust port of the compressor 1 of each compressor refrigeration unit passes sequentially through an oil separator 2, a condenser 3, and a liquid receiver 4, before being combined into three paths. Two of these paths connect to the return gas ports of the compressor 1 of the two or more compressor refrigeration units via bypass pipes 8 equipped with bypass valves 9 and expansion valves 20. The third path supplies air coolers 11 to multiple refrigeration compartments 10. Each air cooler 11 in each refrigeration compartment 10 is connected to an evaporator coil 13 in a buffer chamber 12 corresponding to that compartment. The evaporator coils in the multiple buffer chambers are all connected to a return gas manifold. 14. After the return gas manifold 14, it splits into three paths. Two paths are connected to the gas-liquid separators 15 of the two sets of compressor refrigeration units and then to the return gas port of compressor 1. The third path is sent to the condensers 3 of the two sets of compressor refrigeration units through the adjustable pipeline 16 with the adjustable valve 17. The oil is sent to the condenser 3 together with the oil separator 2. The oil at the bottom of the oil separator 2 is connected to the pipeline after the gas-liquid separator of each compressor refrigeration unit. The compressors 1 of the two sets of compressor refrigeration units are set horizontally, and the bottom of the crankcases of the two compressors are connected by a horizontally set oil balance pipe 18. An electric high-pressure ball valve 19 is set in the middle of the oil balance pipe.

[0017] In this embodiment, a dryer filter 5, a liquid inlet 6, and a liquid level sight glass 7 are installed after the liquid receiver 4 of each group of compressor refrigeration units.

[0018] In this embodiment, the compressor's exhaust port is connected to a high-pressure gauge, a high / low pressure controller, or a high-pressure switch, and the compressor's return port is connected to a low-pressure gauge, a high / low pressure controller, or a low-pressure switch.

[0019] In this embodiment, the temperature sensing element of the expansion valve is connected to the pipeline between the gas-liquid separator and the compressor return port.

[0020] Based on this embodiment, a quick-connector 21 can also be provided on the oil balance pipe. The quick-connector 21 can be provided at any end of the electric high-pressure ball valve or two quick-connectors can be provided at both ends of the electric high-pressure ball valve.

Claims

1. A novel dual-unit refrigeration system, comprising two sets of compressor refrigeration units, each compressor refrigeration unit including a compressor, an oil separator, a condenser, a liquid receiver, and a gas-liquid separator. The exhaust ports of the compressors of the two sets of compressor refrigeration units sequentially pass through the oil separator, the condenser, and the liquid receiver, and then merge into three paths. Two of these paths are connected to the return gas ports of the compressors of the two or more sets of compressor refrigeration units via bypass pipes equipped with bypass valves. The third path supplies air coolers to multiple refrigeration compartments. The system is characterized in that: Each refrigerator compartment's air cooler is connected to an evaporator coil in the corresponding buffer zone. The evaporator coils in multiple buffer zones are connected to a return gas manifold. The return gas manifold is then split into three paths. Two paths are connected to the gas-liquid separators of two sets of compressor refrigeration units and then to the compressor return gas inlet. The third path is sent to the condensers of the two sets of compressor refrigeration units via an adjustable pipeline with an adjustable valve. The compressors of the two sets of compressor refrigeration units are arranged horizontally, and the bottom of the crankcases of the two compressors are connected by a horizontally arranged oil balance pipe. An electric high-pressure ball valve is installed in the middle of the oil balance pipe.

2. The novel dual-unit refrigeration refrigeration device according to claim 1, characterized in that: The oil at the bottom of the oil separator is connected to the pipeline after the gas-liquid separator of the respective compressor refrigeration unit or to the compressor return port.

3. The novel dual-unit refrigeration refrigeration device according to claim 1, characterized in that: Each set of compressor refrigeration units is equipped with a dryer filter, a liquid inlet, and a liquid level sight glass after the liquid receiver.

4. A novel dual-unit refrigeration device according to claim 1, characterized in that: The compressor's exhaust port is connected to a high-pressure gauge, a high / low pressure controller, or a high-pressure switch, while the compressor's return port is connected to a low-pressure gauge, a high / low pressure controller, or a low-pressure switch.

5. A novel dual-unit refrigeration device according to claim 1, characterized in that: An expansion valve is installed after the bypass valve in the bypass pipeline.

6. A novel dual-unit refrigeration refrigeration device according to claim 5, characterized in that: The temperature sensing element of the expansion valve is connected to the pipeline between the gas-liquid separator and the compressor return port.

7. A novel dual-unit refrigeration device according to claim 1, characterized in that: The oil balance pipe is equipped with a quick-connect fitting.

8. A novel dual-unit refrigeration refrigeration device according to claim 7, characterized in that: The quick-connector is installed at either end of the electric high-pressure ball valve or two quick-connectors are installed at both ends of the electric high-pressure ball valve.

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