2026-04-10Views：
Oil-free screw compressor and oil-injected screw compressor are two different types of compressors, which are different in working principle, use occasion and characteristics.
oil-free screw compressor
working principle:
the working principle of the oil-free screw compressor is based on the principle of screw air compression. Its core component is two counter-rotating screws, which mesh with each other in the cylinder. During the rotation of the screw, the air in the cylinder is compressed and gradually flows to the outlet end. The characteristic of this compressor is that no lubricating oil is used in the whole compression process, so the output compressed air is very pure and does not contain oil.
Application Scenarios:
because the compressed air provided by the oil-free screw compressor is pure and oil-free, it is especially suitable for occasions with extremely high air quality requirements, such as food, pharmaceutical production and cotton spinning industries. In addition, oil-free screw compressors are also widely used in the electroplating, automotive spraying and textile industries because of their ability to provide dry and oil-free compressed air.
Features:
the compressed air contains no oil, avoiding the risk of oil contamination.
Compact, modular design makes maintenance easier.
Suitable for a variety of special gas applications, with good sealing and corrosion resistance.
oil-injected screw compressor
working principle:
oil-injected screw compressors use lubricating oil in the compression process. When the compressor is started, the main motor drives the screw rotor to rotate, forming a closed working chamber. As the volume of the working chamber is gradually reduced, the gas is compressed and heated. In order to reduce the compression temperature, the oil injection device will inject lubricating oil into the compressed gas. The lubricating oil and the gas are mixed to form an oil film to achieve sealing and cooling effects.
Application Scenarios:
oil-injected screw compressors are widely used in the manufacturing industry, such as pneumatic tools, stamping, spraying and other production processes, as well as concrete spraying and cleaning coatings in the construction industry that require a large amount of compressed air. In addition, in hospitals and laboratories, oil-injected screw compressors are also commonly used for gas transportation, storage and supply of laboratory tools and equipment.
Features:
the use of lubricating oil for cooling and sealing improves the efficiency and durability of the compressor.
Suitable for high pressure and large flow compression requirements.
The noise is relatively low, the area is small, and the operation is simple.
In summary, the oil-free screw compressor and the oil-injected screw compressor have their own characteristics and application scenarios. Oil-free screw compressors are suitable for industries that require high purity of compressed air, while oil-injected screw compressors are widely used in manufacturing and construction industries because of their efficient cooling and sealing performance.
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