How is the piston pin of a piston compressor lubricated?
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I know it is lubricated through the oil circuit that comes from the piston rod. But if steam bypasses the exhaust valve disc, how does that affect piston pin lubrication?
I don’t understand; does the piston rod have oil passages?
You use too much local dialect; it’s exhausting to read. “But if steam bypasses the exhaust valve disc, how does that affect piston pin lubrication? ” The exhaust valve operates properly for exhaust; it has nothing to do with the lubrication of the piston rod, right? . . And what exactly is a piston pin, as you mentioned? ? ?
Is there oil inside the exhaust valve disc? It is estimated to be the “oil-free lubrication design and low-oil lubrication operation” adopted by reciprocating machines under high-pressure conditions” ； And by piston pin lubrication, you’re probably referring to the lubrication of the component that connects the piston to the crosshead, right? Under normal circumstances, the piston rod and crosshead are fixed together by a locking nut
You mean the piston, right? Pistons are lubricated using an oil injector; if too much oil is used, it can get into the valves, but it shouldn’t affect the lubrication of the piston
The piston is lubricated by oil injected through an injector; it does not have its own oil circuit. I guess you’ve misunderstood; the connecting rod has oil channels to lubricate the crosshead.
The exhaust valve has nothing to do with the lubrication of the piston pin
The lubrication of the crosshead pin has nothing to do with the air valves; crosshead lubrication is carried out through oil injection holes. If the lubrication of the crosshead pin is inadequate, it indicates that the clearance between the crosshead bushing and the pin is too small, or that the design angle of the compressor is too small
It’s something like this: if there is leakage of gas between the high-pressure and low-pressure valve plates, it enters the compression chamber. The upper part of the piston is under high-pressure gas while the lower part is under low pressure. At this point, the oil-pumping action of the piston pin stops, and the lubrication between the piston and the cylinder liner is reduced, causing the piston to quickly damage the cylinder wall.