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Screw compressors can be divided into twin-screw compressors and single-screw compressors. Which one is better? Many screw compressor salesmen are always selling melons and boasting about their sales. Those who sell twin-screw compressors say that twin-screw compressors are better, and those who sell single-screw compressors say that single-screw compressors are better. Objectively speaking, most of the screw compressors sold on the market are twin-screw compressors, with a market share of 90%. Several well-known international and domestic brands all produce twin-screw compressors. Let’s compare them from four aspects.: 1. In principle: The twin-screw compressor is composed of a pair of rotors distributed in parallel and meshing with each other. When working, one rotor rotates clockwise and the other rotates counterclockwise. During the mutual meshing process, the required pressure gas is generated. Its advantages are:: It has extremely high mechanical reliability, excellent dynamic balance, smooth operation, and strong applicability. The single-screw compressor uses a single-screw rotor to drive two symmetrically distributed star wheels to rotate. The screw groove and the inner wall of the casing form a closed element volume, so that the gas reaches the required pressure. Its advantages are: Low manufacturing cost, simple structure, ideal force balance, no clearance volume, etc. ； 2. On the motor: The main motor of the single-screw compressor is an ordinary motor, while the main motor of the twin-screw compressor is an energy-saving motor. Therefore, the bearings of the single-screw motor are seriously worn, which increases operating costs. At present, the compressors of international first-line brands are all twin-screw compressors. For example, American GD compressors, Swedish Atlas, Japanese Kobelco, American Ingersoll Rand, etc. do not use single-screw compressors. 3. Technically: Single-screw compressors are not as mature as twin-screw compressors, and there are no relevant industry standards and * * standards, the right to explain the machine failure belongs to the compressor manufacturer. Twin-screw compressors must comply with * * Standards and industry standards GB8542, TB/T6430. The single-screw compressor compresses air by meshing a single screw with two star wheels. The three are in direct contact, resulting in serious friction between the star wheel and the rotor. (The material of the single-screw star wheel is resin material, so it is easy to wear when the star wheel and the screw are engaged. Resin foam is mixed into the oil of the main engine, which can easily lead to high temperatures and shutdown of the air compressor.) If it is not used for a long time, the internal leakage of the machine head will be large and the exhaust volume will be reduced. The twin screws mesh through the male and female rotors. There is an oil film between the two rotors without direct contact. The friction is small and the exhaust volume does not change with time. 4. Maintenance costs: Although the purchase cost of a single-screw compressor is relatively low, the friction between the star wheel and the rotor is serious, and the star wheel needs to be replaced. The maintenance cost and operating cost will naturally be very high, otherwise the exhaust volume will be seriously lost and the specified requirements will not be met. Although the temporary purchase cost of twin-screw compressors is high, they have extremely high mechanical reliability, stable operation, and strong applicability. This means that later maintenance costs will be very low, the failure rate will be low, and production will not be affected.