Reciprocating-piston type oil-less air compressor

Abstract

The invention relates to a reciprocating-piston type oil-less air compressor. In the invention, a piston of a compressor is fastened with a connecting rod or integrally manufactured with the connecting rod; and the piston is arranged in an air cylinder and reciprocates and swings relative to the air cylinder. The reciprocating-piston type oil-less air compressor is characterized in that: the air cylinder adopts an offset structure, which means the axial line of the air cylinder is not intersected with the axial line of a crankshaft, so the offset angle of the piston relative to the air cylinder is reduced in the compression stroke, and the lateral pressure and panting strength of the piston on the air cylinder and the abrasion loss of a sealing ring or a sealing rubber cup are reduced; besides, the oval deformation of the sealing ring or the sealing rubber cup is reduced, so the fatigue state thereof is relieved and the screech which is generated by the leakage at an oval gap and the escape of gas is reduced; and moreover, structures such as a closed crankcase structure, a crankcase air inlet soundproofing chamber, an air inlet channel and the like are adopted for effectively reducing the induction noise and the induction jetting noise and an exhaust soundproofing housing is adopted for reducing the exhaust noise, so the reciprocating-piston type oil-less air compressor can be used for manufacturing the air compressor, an air pump, a vacuum pump or a fluid pump.

Description

technical field [0001] The invention belongs to the technical field of compressors, and relates to a reciprocating piston air compressor, in particular to a reciprocating piston oil-free air compressor. Background technique [0002] Among the existing air compressors, there is a reciprocating piston oil-free air compressor, which includes a cylinder, a cylinder head, a piston, a connecting rod, a crank pin, a crankshaft, a valve seat and a crankcase, and is different from a general reciprocating piston compressor. The difference is that the piston and the connecting rod of this type of compressor are tightly connected or integrally manufactured. Therefore, during the working process, the piston has both reciprocating and swinging motions relative to the cylinder. The sealing ring or sealing cup made of self-lubricating material, so this type of compressor can provide almost oil-free compressed air, and the crankcase does not need to store lubricating oil, so it is very conve...

AI Technical Summary

Problems solved by technology

However, there are still deficiencies in the zero-bias cylinder structure, which are mainly manifested in: the working life of the sealing ring or sealing cup of the compressor is relatively short, and the working noise of the compressor is also relatively large. The reason is that the compression stroke of the piston The yaw angle and the yaw angle of the suction stroke are in a symmetrical distribution state. This structural layout limits the compressor that is difficult to meet the requirements of different design objectives. Specifically, there are two disadvantages: 1) The zero-offset cylinder structure is not conducive to those requirements Compressors designed for long life, this is due to the limitation of the structure so that the deflection angle of the piston's compression stroke cannot be made small, in other words, the piston has a large inclination angle relative to the cylinder during the compression stroke, which increases the The side pressure force of the piston on the cylinder causes premature wear of the sealing ring or the sealing cup. On the other hand, the high air pressure forces the sealing ring or the sealing cup to produce an elliptical deformation in the process of expanding outward to the cylinder wall. 2) The zero offset cylinder structure is not conducive to those compressors that require low noise design. Also because the deflection angle of the piston compression stroke is relatively large, as a result, when the compressor is in the compression stroke Under the background of high air pressure, on the one hand, the impact force of the piston on the cylinder is intensified, resulting in serious mechanical impact noise; on the other hand, the elliptical leakage gap between the piston and cylinder is increased, causing compressed gas to escape and scream Airflow noise

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