What is the difference between scroll type and screw type air compressor

There are significant differences between scroll and screw air compressors in many aspects. The following is a detailed comparison:

1. working principle

1. scroll air compressor

   • working principle: Based on the rotational motion of two intermeshing scrolls (or scroll rolls). One of the scroll is fixed and the other is driven to rotate by the eccentric shaft. When the eccentric shaft rotates clockwise, gas enters from the suction port and is gradually sucked into the peripheral crescent-shaped air chamber communicating with the suction chamber. With the closing of the crescent-shaped air cavity, its closed volume gradually transfers to the middle of the fixed scroll and shrinks continuously. The gas is continuously compressed, the pressure rises, and finally discharged through the exhaust port.

2. Screw air compressor

   • working principle: The gas compression is realized by the rotating movement of a pair of meshing spiral male and female rotors in the cylinder. The main rotor is driven to rotate by the motor, and the female rotor is driven to rotate by the oil film formed by the main rotor. As the rotor rotates, air is drawn into the compression chamber, compressed in the gap between the rotor and the cylinder wall, and then discharged through the exhaust port.

2. performance characteristics

1. scroll air compressor

   • compact structure: Compact design, small size, light weight, easy to install and maintain.
   • Smooth operation: Because there are no reciprocating parts, the operation is stable, the vibration is small, and the noise is low. Scroll air compressors are usually less noisy than any other type of air compressor and can be placed directly in the production workshop without the need for a dedicated machine room.
   • High energy efficiency: The scroll design allows a higher compression ratio, reduces energy consumption and improves energy efficiency. The volumetric efficiency of the scroll air compressor is as high as 98%, and the energy saving effect is remarkable.
   • Low maintenance costs: Simple structure, few parts, especially few wearing parts, and low maintenance cost. Users only need to clean the filter screen on both sides of the body easily, and change the oil and filter element regularly according to the specifications (only once every 2000 hours of operation).

2. Screw air compressor

   • high reliability: Sturdy structure, reliable operation and low failure rate. The trouble-free running time of the screw compressor can reach 4-80000 hours.
   • strong adaptability: Suitable for various working conditions, including high temperature, high pressure and other harsh environments. The screw air compressor has the characteristics of forced gas transmission, and the exhaust volume is almost not affected by the exhaust pressure.
   • High energy efficiency: The continuous compression of gas is realized through the rotation of the twin screw, and the energy efficiency is high.
   • easy maintenance: Although there are many parts, the maintenance is relatively simple, and only parts such as lubricating oil and filter element need to be replaced regularly.

3. Application Scenarios

1. scroll air compressor

   • applicable Scenarios: Because of its compact structure, stable operation and low noise, it is especially suitable for places with strict space requirements and strict control of noise and vibration. Such as hospitals, laboratories, precision instrument manufacturing and other occasions that require a quiet environment. At the same time, in the food processing, pharmaceutical and other industries, the scroll air compressor is favored because of its oil-free characteristics.

2. Screw air compressor

   • applicable Scenarios widely used in manufacturing, construction, mining and other fields. Because of its high reliability, strong adaptability and high energy efficiency, it is especially suitable for occasions that require a large amount of continuous compressed air. Such as pneumatic tools, spraying equipment, pneumatic conveying systems and other manufacturing applications; drilling, blasting and other mining applications; and construction sites in the pneumatic tools, sandblasting equipment.

4. other features

1. scroll air compressor

   • low noise: The scroll air compressor eliminates the knocking sound of the valve plate and the blasting sound of the air flow due to the lack of suction, exhaust valve and complex movement mechanism, so that the noise is drastically reduced.
   • Long life: The main machine of the scroll air compressor has few parts, small radius of gyration, low linear speed, and low wear, so the mechanical efficiency is high, the vibration is small, and the life is long.

2. Screw air compressor

   • smooth exhaust: The exhaust of the screw air compressor is stable, there is no airflow pulsation, and it is more friendly to gas equipment.
   • Good dynamic balance screw air compressor can work smoothly and at high speed, can realize no foundation operation, especially suitable for mobile compressor.

Generally speaking, there are significant differences between the scroll air compressor and the screw air compressor in the working principle, performance characteristics, application scenarios and maintenance. When choosing air compression equipment, you should evaluate which type of air compressor is more suitable according to specific needs and application scenarios.