Introduction of oil-free screw air compressor

The oil-free screw air compressor compresses air through a two-stage screw rotor, and removes water in the compressed air through a water-gas separator. At the same time, because there is no fuel injection cooling, a pre-cooler, an intercooler, and an after-cooler are generally configured to cool the compressed air to reach the exhaust temperature required by the regulations. In the shaft of the rotor, the lubricating oil is prevented from leaking into the compressed air by a shaft seal with excellent performance, so as to achieve true oil-free.

The screw rotor of the twin-screw air compressor adopts precision gears, which are matched with high-precision processing technology to ensure the meshing between the yin and yang rotors without direct contact. In order to meet the mechanical performance requirements and corrosion resistance requirements of the spiral rotor, the rotor is generally made of high-performance alloy steel, and the surface is sprayed with modified Teflon material, which ensures the corrosion resistance of the surface while ensuring excellent mechanical properties. There are also spiral rotors made of stainless steel, but the relative gap between the stainless steel rotors is large, so that the efficiency of the equipment is low.

Working principle

oil-free screw air compressor is a working volume for rotary motion of the volumetric gas compression machinery. The compression of the gas depends on the change of the volume, and the change of the volume is achieved by means of a pair of rotors of the air compressor in the casing.

Working principle overview

in the body of the compressor, a pair of spiral rotors meshing with each other are arranged in parallel, and the rotor with convex teeth outside the pitch circle is usually called a male rotor or a male screw. The rotor with concave teeth in the pitch circle is called the female rotor or the female screw. Generally, the male rotor is connected with the prime mover. The male rotor drives the female rotor to rotate the last pair of bearings on the rotor to achieve axial positioning and bear the compressor. Axial force. The cylindrical roller bearings at both ends of the rotor enable the rotor to achieve radial positioning and withstand the radial forces in the compressor. At both ends of the compressor body, orifices of a certain shape and size are respectively opened. One is for suction, called the intake port; the other is for exhaust, called the exhaust port.

Intake

the air intake process of the detailed analysis of the working process of the screw air compressor: when the rotor rotates, the space of the tooth groove of the male and female rotor is the largest when it is turned to the opening of the air intake end wall. at this time, the space of the tooth groove of the rotor is connected with the air intake. because the gas in the tooth groove is completely discharged during exhaust, the tooth groove is in a vacuum state when it is turned to the air intake, enter the tooth groove of the male and female rotor along the axial direction. When the gas fills the entire tooth groove, the end face of the rotor inlet side turns away from the casing inlet, and the gas in the tooth groove is closed.

Compression

detailed analysis of the working process of screw air compressor compression process: when the yin-yang rotor is inhaling, the tooth tip of the yin-yang rotor will be closed with the casing, and the gas will no longer flow out in the tooth groove. The engagement surface gradually moves toward the exhaust end. The tooth groove space between the meshing surface and the exhaust port is gradually smaller, and the gas in the tooth groove is compressed and the pressure is increased.

Exhaust

exhaust process of detailed analysis of the working process of screw air compressor: when the meshing end surface of the rotor turns to communicate with the exhaust port of the casing, the compressed gas starts to be discharged until the meshing surface of the tooth tip and the tooth groove moves to the exhaust end surface. at this time, the tooth groove space between the meshing surface of the male and female rotor and the exhaust port of the casing is 0, I .e. the exhaust process is completed, at the same time, the length of the tooth groove between the meshing surface of the rotor and the air inlet of the casing reaches the longest, and the air intake process is carried out again.