| 摘要 |
<p>PROBLEM TO BE SOLVED: To effectively reduce pulsation of suction pressure by self-excited vibration at a low flow rate time of suction valve by arranging an opening control valve in a suction passage of a compressor, and controlling this opening control valve so as to reduce the opening hole area at a small suction flow rate and to increase the area at a large suction flow rate. SOLUTION: When a main shaft 2 is rotated in driving, a piston 6 is reciprocated in a cylinder 5 through a crank mechanism 7, and refrigerant gas of a suction chamber 16 is sucked in the cylinder 5 through a suction valve 14 to be delivered in a delivery chamber 15 from a delivery valve 13 after increased in pressure. In this case, since pressure reduction of the suction chamber 16 increases more than that of pressure of a suction port 17 at a high flow rate time, an opening contorl valve 22 is pushed down against a spring 23 by a pressure difference to increase the opening hole area of a gas passage 18. While, since a pressure difference between the suction chamber 16 and the suction port 17 reduces at a low flow rate time, the opening control valve 22 is raised by restoring force of the spring 23 to reduce the opening hole area of the gas passage 18.</p> |
