In order to prevent the energy loss in the air compressor and the leakage of the gas in the air compressor to the outside world, an inner sealing device should be installed in the air compressor, and a shaft end sealing device should be installed at the shaft end, especially the connection end between the shaft and the prime mover, that is, Outer sealing device.

The mechanical seal is a shaft sealing method commonly used in air compressors and other pumps and rotary compressors. It is mainly composed of a moving ring installed on the shaft or shaft sleeve and a static ring installed on the sealing end cover. The end face in contact between the moving ring and the static ring is called the friction pair, and the space enclosed by the rotor shaft, mechanical seal, end cover, bearing seat, and other parts is called the ceiling cavity.

The sealing principle of the mechanical seal is that when the air compressor is running, oil is injected into the sealing cavity through pressure, and the sealing oil entering the friction pair forms an oil film on the surface of the friction pair under the action of oil pressure, spring force and high speed. Prevent the working material (gas, lubrication, etc.) in the machine cavity from leaking out through the extension shaft.

For the working principle of the mechanical seal, the pair of friction pairs between the dynamic ring and the static ring that form the oil film is its core key. This pair of friction pairs has very strict precision requirements and is paired with precision grinding. Its installation is also very important, and it is necessary to ensure that the friction pair can be closely fitted in a static state, otherwise, it is difficult to form an effective oil film when the machine is running. A mechanical seal with only one pair of friction pairs is called a single-end mechanical seal, and a mechanical seal with two pairs of friction pairs is called a double-end mechanical seal.

The working nature of the air compressor determines the precision of its structure and the high quality of related parts, and the seal is an important structural part that cannot be ignored. The quality of the sealing determines the degree of leakage loss of the equipment.

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