| 摘要 |
PURPOSE:To regulate the opening of a constant pressure valve according to the magnitude of a suction pressure and to enable continuously variable control of capacity by a method wherein the outlet of a constant pressure valve is connected to the gas suction side of a compressor, and the inlet thereof is connected to the actuating chamber of an unloader cylinder. CONSTITUTION:When a piston 2 is reciprocated, refrigerant gas flows through a suction passage 11 of a valve plate 3 after the passage of it through a suction cavity 5, and forcibly opens a suction valve 6 and is sucked in a compression chamber 12. Meanwhile, when the piston 2 is reciprocated, refrigerant gas of the compression chamber 12 is compressed, a delivery valve 7 is opened, and flows through a delivery passage 13 to a delivery chamber 8. In this case, the outlet of a constant pressure valve 30 is coupled to a low pressure gas pipe 27, and the inlet thereof is communicated to a working chamber 16 through a lead pipe 15. When the suction pressure of a compressor is, for example, reduced, through the increase of the opening of the constant pressure valve 30, the pressure of the working chamber 16 is reduced. This constitution rises an unloader piston 10 and increases a top clearance volume. |
