The difference between an oil-free air compressor and an oil-lubricated air compressor is that the piston ring used is different. The former uses a non-metallic piston ring and the latter uses a metal piston ring. Therefore, we use the following measures to improve: 1 replace the metal with a non-metallic piston ring. Piston ring; 2 to the piston body to carry out appropriate amount of machining; 3 to increase the guiding support on the piston body; 4 to cancel the cylinder oil lubrication system.
The air compressor piston ring is made of cast iron. After the cylinder is changed to oil-free lubrication, the piston ring itself must have self-lubricating properties. At the same time, it must have wear resistance, small friction coefficient, good sealing performance and high temperature and high temperature. Work under pressure. At present, medium-sized and small-sized oxygen generators are widely used as materials for piston rings and guide rings. The service life is up to 8000 hours, and its composition is generally 75% polytetrafluoroethylene and 25% glass fiber. This material has good self-lubricating properties and good sealing performance, so we chose to fill PTFE as the material of the piston ring and the guiding support.
The principle of the transformation is: when the exhaust pressure of the air compressor reaches the unloading pressure, the first-stage suction valve is opened, the first-stage cylinder does not work, does not discharge high-pressure gas, and enters the intake chamber of the secondary cylinder (the working principle is to open The principle of the suction valve of the air compressor), after the pressure in the intake chamber of the secondary cylinder passes for a short time, the pressure is insufficient to open the intake valve of the secondary cylinder, and the secondary cylinder does not work either. The high pressure gas is not discharged (the principle of operation is the same as the principle of closing the intake chamber of the air compressor). Therefore, the air compressor achieves the purpose of unloading. It is an effective countermeasure to improve the efficiency of the motor and reduce the copper loss caused by the heating of the winding. In order to reduce the resistance of the winding, the circumference of the winding should be shortened so that the wire diameter of the winding wire reaches the thickest within the tolerance of the groove full rate.
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