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Principle and application of screw chiller


Dongguan Guansheng Machinery Factory is a professional manufacturer and sales of chiller and screw chiller . This chapter mainly introduces the principle and application of screw chiller to help you make a deeper understanding of screw chiller. To understanding!

Principle of screw chiller

The screw chiller is named as the screw chiller because of its key component. The compressor is a screw chiller. The state of the unit from the evaporator is a gas refrigerant. After the compressor is adiabatically compressed, it becomes a high temperature and high pressure state. The compressed gas refrigerant is cooled and condensed in the condenser under constant pressure. After the condensation, it changes to a liquid refrigerant, which is then expanded to a low pressure by a throttle valve and becomes a gas-liquid mixture. Among them, the liquid refrigerant at low temperature and low pressure absorbs the heat of the material to be cooled in the evaporator, and becomes a gaseous refrigerant again. The gaseous refrigerant re-enters the compressor through the pipeline and starts a new cycle. These are the four processes of the refrigeration cycle. It is also the main working principle of screw chiller.

Application of screw chiller

The power of the screw chiller is relatively large compared to the scroll type. It is mainly used in central air-conditioning systems or large industrial refrigeration. (1) Twin-screw refrigeration compressor: The twin-screw refrigeration compressor is an energy-adjustable fuel injection. compressor. Its three continuous processes of suction, compression, and exhaust are realized by the periodic volume change that occurs when a pair of meshing male and female rotors in the body rotate. Generally, the male rotor is a driving rotor, and the female rotor is a driven rotor. Main components: double rotor, body, main bearing, shaft seal, balance piston and energy regulating device. The capacity is 15 ~ 100% stepless adjustment or two or three-stage adjustment. The hydraulic piston is used to increase or decrease the load. Conventional use: radial and axial rolling bearings; open type with oil separator, oil storage tank and oil pump; closed type for differential pressure oil supply for lubrication, injection, cooling and drive piston valve capacity adjustment Inspiratory process: The gas enters the interdental volume of the yin-yang rotor through the suction port. Compression process: When the rotor rotates, the volume between the male and female rotor teeth is connected (V-shaped space). Because the teeth mesh with each other, the volume gradually decreases and the gas is compressed. Exhaust process: The compressed gas is moved to the exhaust port to complete a working cycle.
(2) The single screw refrigeration compressor uses the meshing of an active rotor and two star wheels to generate compression. Its three continuous processes of suction, compression and exhaust are realized by periodic volume changes when the rotor and star wheel rotate. The rotor has six teeth and the star wheel has eleven teeth. The main components are a rotor, two star wheels, a body, a main bearing, and an energy regulating device. The capacity can be adjusted steplessly from 10% to 100% and three or four stages. Inspiratory process: the gas enters the rotor slot through the intake port. With the rotation of the rotor, the star wheel enters into a state of meshing with the cogging of the rotor in turn, and the gas enters the compression cavity (closed space formed by the surface of the rotor cogging, the inner cavity of the casing and the tooth surface of the star gear). Compression process: As the rotor rotates, the volume of the compression chamber is continuously reduced, and the gas is compressed until the leading edge of the compression chamber is turned to the exhaust port. Exhaust process: After the leading edge of the compression chamber is turned to the exhaust port, exhaust is started, and a working cycle is completed. Due to the symmetrical arrangement of the star wheels, the compression occurs twice each time the cycle rotates, and the exhaust volume is correspondingly twice that of the above-mentioned cycle.



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