Hydraulic Air Compressor

1. Permanent magnet motor has high performance permanent Magnet.

2. It has the integrated structure, configuration of high efficiency permanent magnet motor, small size, saving space, easy disassembly.

3. Realizing soft start, the motor current will not exceed the full load Current during operation, and greatly reduce the impact on network Equipment, no damage to electrical equipment.OSG-EZV series permanent magnet compressor.

4. It will achieve lower operation noise than ordinary Ones.

Two-stage compression cooling system

The two-stage hydraulic air compressor cooling cycle can be divided into an intermediate complete cooling cycle and an intermediate incomplete cooling cycle according to the intermediate cooling mode;

The intercooling method of the two-stage compression refrigeration cycle is related to the type of refrigerant.

For example, in the ammonia two-stage refrigeration compressor, the intermediate complete cooling cycle is generally adopted; and in the Freon two-stage refrigeration compressor, the intermediate incomplete cooling cycle is mostly adopted. This is because the adiabatic index of Freon refrigerant is smaller than that of ammonia and has little effect on the exhaust temperature.

The two-stage compression refrigeration cycle can be divided into a one-stage throttling cycle and a two-stage throttling cycle according to the throttling method. The so-called intermediate complete cooling refers to the cooling of the low-pressure stage exhaust gas to saturated steam at an intermediate pressure.

If the low-pressure stage exhaust is cooled but not cooled to a saturated steam state, it is called intermediate incomplete cooling. If the high-pressure liquid is first throttled from the condensing pressure Pk to the intermediate pressure Pm, and then reduced by Pm to the evaporation pressure Po, it is called a two-stage throttling cycle. If the refrigerant liquid is directly throttled from the condensing pressure Pk to the evaporation pressure Po, it is called a first-stage throttling cycle.

1. A two-stage compression refrigeration cycle with one-stage throttling and complete cooling in the middle

work process

The low-pressure low-temperature refrigerant vapor generated in the evaporator is sucked by the low-pressure compressor and compressed into superheated vapor of intermediate pressure, then enters the intercooler of the same pressure, and is cooled into dry saturated vapor in the intercooler.

The medium-pressure dry saturated vapor is sucked by the high-pressure hydraulic air compressor and compressed to the superheated vapor at the condensing pressure, and then enters the condenser to be condensed into refrigerant liquid. Then it is divided into two paths, one path enters the intercooler after throttling and pressure reduction through the expansion valve F, and most of the liquid enters the intercooler coil from the other path for subcooling.

However, due to the heat transfer temperature difference, it cannot be cooled to the intermediate temperature in the coil, but is generally higher than the intermediate temperature by △t=3-5°C.

The sub-cooled liquid is throttled and pressure-reduced by the main expansion valve into a low-temperature and low-pressure sub-cooled liquid, and finally enters the evaporator to absorb heat and evaporate, resulting in a cooling effect.

2. A two-stage compression refrigeration cycle with one-stage throttling and incomplete cooling in the middle.

work process:

The steam from the evaporator is sucked by the low-pressure compressor after passing through the regenerator, compressed to the intermediate pressure and mixed with the dry saturated steam from the intercooler in the pipeline, so that the superheated steam discharged from the low-pressure machine is cooled down. It enters the high-pressure compressor, is compressed to the condensing pressure and enters the condenser.

The condensed high-pressure refrigerant liquid enters the serpentine coil of the intercooler for re-cooling, and then enters the regenerator to exchange heat with the low-temperature and low-pressure steam from the evaporator, so that the refrigerant from the serpentine coil of the intercooler The supercooled liquid is cooled again, and finally enters the evaporator through the expansion valve to absorb heat and evaporate.

1. Two-stage compression refrigeration cycle with two-stage throttling and complete cooling in the middle.

The saturated vapor of the refrigerant from the evaporator is sucked in by the low-pressure stage compressor, compressed to an intermediate pressure pm, and discharged into the intercooler, where it is cooled by the refrigerant liquid to become saturated vapor, while a part of the liquid refrigerant in the intercooler is absorbed The heat becomes saturated vapor, and the two enter the high-pressure stage of the compressor together, and are compressed to the condensation pressure pk again.

Enter the condenser and condense into a saturated liquid, reduce the pressure to the intermediate pressure pm through the throttle valve A, and enter the intercooler to be separated into vapor and liquid. In the intercooler, a small part of the liquid refrigerant used to cool the exhaust gas of the low-pressure stage becomes vapor, and is sucked back by the high-pressure stage along with the low-pressure exhaust and the vapor generated by throttling.

Most of the liquid refrigerant is throttled to the evaporating pressure p0 by the throttle valve B, and enters the evaporator to produce cold energy. The cycle continues in this way.

Note: In order to prevent the saturated liquid from the intercooler from flashing into steam in the pipeline, the distance between the intercooler and the evaporator is usually required to be close.

2. Two-stage compression refrigeration cycle with two-stage throttling and incomplete cooling in the middle

The refrigerant saturated vapor from the evaporator is sucked in by the low-pressure stage hydraulic air compressor, compressed to an intermediate pressure and mixed with the dry saturated vapor from the intercooler in the pipeline, and the two enter the high-pressure stage of the compressor together, and are compressed again to condense. Pressure pk.

Enter the condenser and condense into a saturated liquid, reduce the pressure to the intermediate pressure pm through the throttle valve A, and enter the intercooler to be separated into vapor and liquid. In the intercooler, a small part of the liquid refrigerant used to cool the exhaust gas of the low-pressure stage becomes vapor, and is sucked back by the high-pressure stage along with the low-pressure exhaust and the vapor generated by throttling.

Most of the liquid refrigerant is throttled to the evaporating pressure p0 by the throttle valve B, and enters the evaporator to produce cold energy. The cycle continues in this way.

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