Which is better, scroll air compressor or screw air compressor?

Scroll air compressors and screw air compressors are both positive displacement rotary compressors. The scroll air compressor uses the meshing of the rotor and the stator to form multiple compression chambers. As the rotor translates and rotates, the internal volume of each compression chamber continuously changes to achieve the suction and compression of gas. The screw air compressor compresses air by It is achieved by changing the volume of the tooth slots of the male and female rotors that are installed in the casing and mesh in parallel with each other. The working principle of the rotary air compressor
The main components in the rotary compressor are two involute scrolls with the same shape but relatively staggered angular positions. One is a fixed scroll, and the other is made of The eccentric shaft drives the orbiting roll, whose axis revolves around the axis of the fixed roll. During operation, the two rolls are cut in many places to form sealing lines, and with appropriate sealing at the end faces of the two rolls, several crescent-shaped air cavities are formed. The sealing line at the common tangent point between the two rolls continuously shifts along the vortex curve as the orbiting roll revolves, causing the shape and size of these crescent-shaped air cavities to keep changing. The suction port of the compressor is opened at the upper part of the fixed roll shell. When the eccentric shaft rotates clockwise, the gas enters the suction chamber from the suction port and is successively taken into the peripheral crescent-shaped air chamber that is connected to the suction chamber. Here, as these peripheral crescent-shaped air chambers are closed and no longer communicate with the suction chamber, their sealed volume is gradually transferred to the center of the fixed volume and continues to shrink. The gas is continuously compressed and the pressure increases.
The working principle of a rod air compressor
The cylinder of a rod air compressor is equipped with a pair of intermeshing spiral male and female rotors, which rotate in opposite directions to each other. The gap between the rotors and between the casing and the rotor is only ~ wire. The main rotor is driven by the engine or motor, and the female rotor is driven by the oil film formed by the main rotor through oil injection, or by the main rotor end and the concave rotor end. Synchronous gear drive. The spiral rotor groove is filled with gas when passing through the suction port. When the rotor rotates, the rotor groove is closed by the casing wall to form a compression chamber. When the rotor groove is closed, lubricating oil is sprayed into the compression chamber to seal and Cooling and lubrication. When the rotor rotates to compress the lubricant + oil and gas mixture, the volume of the compression chamber decreases, and the oil and gas mixture is compressed toward the exhaust port. When the compression chamber passes through the exhaust port, the oil and gas mixture is discharged from the compressor, completing a suction, compression and exhaust process. . Each rotor of the screw machine is supported by an anti-friction bearing, which is fixed by an end cap near the end of the rotating shaft. The intake end is supported by a roller bearing, and the exhaust end is supported by a pair of opposing cone rollers. It is usually the exhaust end bearing that positions the rotor, that is, the thrust bearing, which resists axial thrust, bears radial load, and Provide the necessary minimum clearance for axial operation. The working cycle can be divided into three processes: suction, compression and exhaust. As the rotor rotates, each pair of intermeshing teeth successively completes the same working cycle.
Advantages of rotary air compressor
There is no reciprocating mechanism, so the structure is simple, small in size, light in weight, with few parts (especially less wearing parts), high reliability and small torque variation
, high balance, small vibration and smooth operation, making it easy to operate and easy to realize automation
It has high efficiency within its adapted cooling capacity range
Low noise
Rod air compressor Advantages
Screw compressors are the same as piston compressors, and they are both positive displacement compressors. Judging from the use effect, the screw air compressor has the following advantages.
High reliability. The screw compressor has few parts and no wearing parts, so it operates reliably, has a long service life, and has an overhaul interval of up to 10,000 hours.
Easy to operate and maintain. The screw compressor has a high degree of automation. Operators do not need to undergo long-term professional training and can achieve unattended operation.
Good power balance. The screw compressor has no unbalanced inertial force, the machine can work smoothly and at high speed, and can realize foundation-free operation. It is especially suitable for mobile compressors, with its small size, light weight and small footprint.
Strong adaptability. The screw compressor has the characteristics of forced gas transmission. The volumetric flow rate is almost not affected by the exhaust pressure. It can maintain high efficiency in a wide range. It is suitable for a variety of working conditions without any changes in the compressor structure.