| 摘要 |
PURPOSE:To prevent housing of a closing valve of an unloader at transition from a capacity-regulated operation to a no-load operation by connecting a gas passage communicating to a control pressure chamber of the unloader to a gas passage communicating to a receiver tank through a regulator valve. CONSTITUTION:When a pressure in a receiver tank 7 for reserving compression gas discharged by a compressor body 1 exceeds a first set value and a first regulator valve 40 is opened, a pressure is supplied from a passage 22 to a control pressure chamber 38 of an unloader 3, and a part of the gas is introduced into a suction passage 12 through an orifice 29 and an opening 19. When the pressure in the passage 22 exceeds a second set value, a second regulator valve 50 is opened, and a part of the pressure gas is introduced into the suction passage 12 through the regulator valve 50 and the orifice 29. When the pressure in the receiver tank 7 reaches a third set value, a pressure switch PS is actuated so as to bring a directional control valve 26 to B position and the pressure in the passage 21 is supplied to the control pressure chamber 38. |
