关键词: 空气压缩机, 无油润滑, 摆杆约束, 往复活塞, 侧压力, 敲缸

Abstract:

A new oil-free-reciprocating piston air compressor was proposed. In the new type of compressor, an oscillating rod mechanism was used to ensure the connecting rod and piston working in closely straight reciprocating motion, so that the knocking and side pressure between the cylinder and the piston were decreased significantly. Compared with traditional compressor, the height of the new compressor is reduced by 24% while the noise and friction power are decreased by 7.4% and 1dB (A) respectively and the seal ring lifetime is increased by about 10%. A mathematic model was established and the operation characteristics of the oscillating rod were analyzed. The theoretical studies show that the swing amplitude of the piston and seal ring are decreased significantly and the knocking strength and side pressure of cylinder wall are reduced because of the restriction of the oscillating rod, and that the rod's loading condition can be improved by setting the mechanism's quick-return trip correspondence to the compressor's suction stroke.

Key words: air compressor, oil-free lubrication, oscillating rod restriction, reciprocating piston, side-pressure, knock