The sealing principle of oil-free air compressor mainly involves three aspects: cylinder seal, piston seal and door seal.
1. Cylinder seal: The cylinder of oil-free air compressor is usually a double-acting cylinder, and the seal is mainly achieved by the seal between the cylinder piston and the cylinder. Commonly used sealing methods include plug ring seal, O-ring seal and gasket.
Piston ring sealing is one of the most common cylinder sealing methods. Piston rings are usually made of metal and elastic materials to maintain a good sealing performance in the cylinder barrel. Piston ring seal can be divided into two forms of single ring seal and double ring seal, double ring seal is relatively more reliable sealing performance.
O-ring A common sealing element with a circular cross-section. The O-ring is usually installed in the sealing groove inside the cylinder piston or cylinder, and is sealed by compression deformation between it and the cylinder piston or cylinder.
A gasket is a detachable sealing element, usually made of a polymer material. The gasket is installed between the cylinder head and the cylinder barrel to avoid gas leakage through its good sealing performance.
2. Piston seal: Piston seal mainly refers to the seal between the piston and the cylinder wall. Common piston seal methods include piston ring seal and piston rod seal.
Piston ring seal has been mentioned in the cylinder seal, its role is to achieve cylinder seal, but also play the role of piston seal.
Piston rod sealing is mainly achieved by using sealing rings, seals and other sealing elements. The sealing ring is usually installed between the piston rod and the piston rod sealing groove, and the sealing effect is achieved through the contact with the piston rod. The sealing gasket is installed between the piston rod sealing groove and the sealing seat, and is sealed by its compression deformation.
3. Valve seal: The valve in the oil-free air compressor includes an inlet valve and an exhaust valve. The main function of the valve seal is to prevent gas leakage and reverse flow.
The intake valve is usually in diaphragm or ball valve form. The diaphragm valve achieves one-way gas flow through the seal between the elastic diaphragm and the seat. The ball valve achieves one-way gas flow through the seal between the ball and the seat. Valves are usually sealed with a gasket or O-ring made of elastic material to ensure sealing performance.
Exhaust valves are usually in the form of diaphragm valves or piston valves. The sealing principle of diaphragm valve and piston valve is similar to that of intake valve, which realizes one-way gas flow through the seal between the valve plate and the seat.
In short, the sealing principle of oil-free air compressors mainly involves three aspects: cylinder seal, piston seal and valve seal. Through reasonable selection of sealing materials and sealing structure, as well as maintaining the finish and flatness of the sealing surface, gas leakage can be effectively avoided and the normal operation of the oil-free air compressor can be ensured.
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