| 摘要 |
A piston stroke limiting device for a reciprocating compressor of the type including a piston ( 2 ) reciprocating inside a cylinder ( 3 ), which is closed by a cylinder head ( 4 ) and defines, between the latter and the top of the piston ( 2 ), a compression chamber ( 5 ), said device comprising: a driving element ( 40 ) provided in one of the parts defined by the piston ( 2 ) and the cylinder head ( 4 ) and projecting to the inside of the compression chamber ( 5 ), in order to touch the other of said parts when the piston ( 2 ) surpasses a predetermined nominal position at the end of the compression stroke; and a relief valve ( 60 ), which is selectively displaced from a closed condition, in which it is seated on a respective valve seat ( 51 ) defined in a relief passage ( 50 ) communicating the compression chamber ( 5 ) with a region of the compressor subject to a substantially lower operational pressure, to an open condition, by action of the driving element ( 40 ), when the piston ( 2 ) surpasses said predetermined nominal position at the end of the compression stroke.
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