What is the working principle of semi-hermetic screw refrigeration compressor?

Semi-hermetic screw refrigeration compressors are key devices widely used in industrial and commercial refrigeration systems. Their working principle is based on the compression and discharge process of the refrigerant by the compressor.
Basic principle of screw compressors:Semi-hermetic screw refrigeration compressors adopt the working principle of screw compressors. Screw compressors are composed of two intermeshing screws (usually the main screw and the driven screw), which rotate to achieve gas compression. In the internal space of the compressor, the gas enters from the suction port, and as the screw rotates, the gas is gradually compressed and discharged, eventually forming high-pressure gas.
The working cycle of a semi-hermetic screw refrigeration compressor usually includes four main stages: suction, compression, cooling, and discharge.
Suction stage: The refrigerant (usually Freon or ammonia) enters the compressor suction port from the evaporator at a low pressure and low temperature.
Compression stage: The refrigerant is compressed in the compressor by the screw, and the pressure and temperature gradually increase as the screw rotates.
Cooling stage: The heat generated during the compression process needs to be cooled to prevent overheating and damage to the equipment. This is usually achieved by cooling the lubricating oil or circulating water to ensure the normal operation of the screw and other components.
Discharge stage: The high-pressure refrigerant is discharged from the discharge port of the compressor and enters the condenser for cooling and condensation, thereby releasing heat and transforming into a liquid state.
Semi-enclosed structure:One of the characteristics of semi-hermetic screw refrigeration compressors is their semi-enclosed structure. This means that the compression chamber inside the compressor is partially isolated from the external environment, which can reduce the dependence on external air, reduce the influence of ambient temperature and humidity, and improve the stability and reliability of the compressor.
Control system:Semi-hermetic screw refrigeration compressors are usually equipped with advanced control systems to monitor and adjust the operating status of the compressor. These control systems can automatically adjust the operating parameters of the compressor according to the real-time workload and environmental conditions to achieve optimal performance and energy efficiency.
Application areas:Semi-hermetic screw refrigeration compressors are widely used in industrial production, commercial buildings and air conditioning systems, etc. Their efficient and stable performance makes them an important equipment in the refrigeration industry.
The working principle of semi-hermetic screw refrigeration compressors is based on the working principle of screw compressors, and through the semi-enclosed structure and advanced control system, efficient and stable refrigeration effects are achieved, providing reliable refrigeration solutions for various application scenarios.