The screw compressor is composed of a pair of parallel and interlocked female and male screws, and is widely used in medium and large refrigeration systems. Screw compression is divided into two types: single screw and twin-screw. The commonly referred screw compressor is the twin-screw compressor.
Screw compressors have the following characteristics:
1. Screw refrigeration compressors have a simple structure, few components, and no vulnerable parts such as air valves, piston rings, rotors, bearings, etc. They have relatively high strength and wear resistance.
2. Screw compressors have the characteristic of forced gas delivery, that is, the displacement is almost not affected by the exhaust pressure, and there is no surge phenomenon when the displacement is small. They can still maintain high efficiency in a wide range of operating conditions.
3. Screw compressors are not very sensitive to liquid hammer and can use oil injection cooling. Therefore, at the same pressure ratio, the discharge temperature is much lower than that of piston compressors, resulting in a higher single-stage pressure ratio.
4. Adopting slide valve adjustment, it can achieve stepless energy regulation. The focus of today's article is to analyze the principle and process of adjusting the slide valve of screw compressors.
We need to know that the slide valve is used for infinite control of capacity. After normal shutdown and startup, the component does not load. The slide valve is controlled by a microcontroller board through oil pressure, ultimately changing the compressor's cooling capacity.
