RECIPROCATING TYPE COMPRESSOR

摘要

PURPOSE:To improve volumetric efficiency, and restrain a rise in a delivery temperature by reducing a residual gas quantity. CONSTITUTION:The first conducting passages 22a and the second conducting passages 22b whose rows are divided in the shaft direction, are formed between respective bores 1A-1F and a central shaft hole 1b. A rotary valve 25 in which a suction passage 25a is formed to communicate a suction chamber 7 in order with the conducting passages 22a and 22b connected to the bores 1A-1F in a suction stroke, is connected rotatably synchronously to a driving shaft. After low pressure gas in the initial stage of compression is shut up first in the second conducting passages 22b on the lower dead center side at compression and delivery strokes according to forward movement from a lower dead center position of a piston 19, high pressure gas in the last stage of compression is shut up in the first conducting passages 22a on the upper dead center side. A quantity of residual gas shut up in the conducting passages can be reduced by the extent that gas pressure being shut up is reduced.