LIQUID-COOLING TYPE COMPRESSOR AND OPERATION METHOD THEREOF

PROBLEM TO BE SOLVED: To reliably avoid that pressure in a gas-compressed space at the closure of a suction regulation valve becomes undesired negative pressure, and to protect a compressor main body, in a liquid-cooling type compressor.SOLUTION: A liquid-cooling type compressor comprises: a compressor main body 11 installed between a suction flow passage 10 and a discharge flow passage 12; a suction regulation valve 20 disposed at the suction flow passage; a return flow passage 35 which is branched from the discharge flow passage, and connected to the suction flow passage which is located between the suction regulation valve and the compressor main body; an on-off valve 16 disposed at the return flow passage; an atmosphere release flow passage 36 which is branched in the return flow passage located at a downstream side rather than the on-off valve; and a throttle part 17 disposed at the atmosphere release flow passage. Main body side suction pressure Pat the main body suction side of the suction flow passage at the closure of the suction regulation valve is set so as to exceed lower limit negative pressure Pfor avoiding plosive sound from the suction regulation valve.SELECTED DRAWING: Figure 1 【課題】液冷式圧縮機において、吸込調整弁が閉止しているときにおけるガス圧縮空間内の圧力が、望まれない負圧になるのを確実に回避でき、圧縮機本体を保護する。【解決手段】吸込流路１０及び吐出流路１２の間に配設される圧縮機本体１１と、吸込流路に設けられる吸込調整弁２０と、吐出流路から分岐され、吸込調整弁と圧縮機本体との間に位置する吸込流路に接続される戻し流路３５と、戻し流路に設けられる開閉弁１６と、開閉弁よりも下流側に位置する戻し流路において分岐される大気開放流路３６と、大気開放流路に設けられた絞り部１７と、を備え、吸込調整弁が閉止しているときにおける吸込流路の本体吸込側での本体側吸込圧Ｐ１が、吸込調整弁からの破裂音を回避する下限負圧ＰＢを上回るように構成されている。【選択図】図１