The difference between scroll compressor and screw compressor

Scroll compressor and screw compressor are two different types of compressors, and there are some differences in their working principle, structural characteristics and application fields. Here are the main differences between the two:

1. working principle

scroll compressor: Compressible volume is composed of a fixed involute scroll and an involute moving scroll with eccentric rotation and translation. In the work process of suction, compression, and exhaust, the static disk is fixed on the frame, and the moving disk is driven by an eccentric shaft and restricted by an anti-rotation mechanism. It rotates on a plane with a small radius around the center of the static disk base circle. The gas is sucked into the periphery of the static disc through the air filter element. With the rotation of the eccentric shaft, the gas is gradually compressed in several crescent-shaped compression chambers composed of the static and static disc, and then continuously discharged from the axial hole of the central part of the static disc.

Screw compressor: rely on the meshing movement of the male and female rotor, with their teeth, tooth groove and the inner wall of the casing formed by the "V" shape of a pair of interdental volume to complete the process of lifting low-pressure gas to high-pressure gas. The specific working principle is that the rotor groove is filled with gas when passing through the suction port. When the rotor rotates, the groove is closed by the casing wall to form a compression chamber. When the rotor grooves are closed, lubricating oil is injected into the compression chamber, which can provide both sealing and cooling and lubrication. During the rotation of the rotor, after the lubricating oil and the refrigerant are mixed, they will be compressed and discharged to the condenser for condensation.

2. structure characteristics

scroll compressor: It has the characteristics of simple structure, small size and light weight. In addition, it has no automatic exhaust valve, which reduces the frictional resistance of spare parts and exhaust pipes, thereby reducing noise and vibration. The precision of the scroll compressor is high, so its machining accuracy is relatively high.

Screw compressor: It has the characteristics of simple structure and high stability. The rotor moves smoothly, so the noise and vibration are relatively small. In addition, the screw compressor is small in size and is suitable for places with limited space. At the same time, due to its simple structure and relatively small number of components, maintenance costs are relatively low.

3. Application Areas

scroll compressors and screw compressors have their advantages in different application areas. Scroll compressors are commonly used in painting equipment in the automotive industry, wind tunnel experiments in the field of aerodynamics, and the oil and gas industry. Screw compressors are widely used in light industry, electric power, metallurgy, chemical fiber and engineering repair and other industries.

In summary, there are obvious differences between scroll compressors and screw compressors in terms of working principle, structural characteristics and application fields. Which type of compressor to choose depends on the specific application needs and scenarios.