| 摘要 |
PURPOSE:To control the stroke of a piston and the capacity of a cylinder simply and at a low cost by converting the electromagnetic force of an electromagnetic driving differential pressure regulating valve so as to regulate the differential pressure between the pressure in an airtight chamber housing an oscillating body, and the pressure of a coolant sucked in the cylinder. CONSTITUTION:When the main shaft 3 of a compressor 51 is rotated, an oscillating plate 7 is oscillated through a swash plate 6 or the like, and at the same time, a piston 9 is reciprocated through a poston rod 21. As a result, a coolant gas is sucked in a cylinder 8 from a suction port 10a, and after being contracted, it is discharged from a discharge port 11a. In this case, a differential pressure regulating valve 100 is provided in a passage 27 to communicate a crankcase 2 and a suction chamber 10. And a ball valve 104 opposing to a valve seat 103 is connected directly to the iron core 106 of an electromagnetic coil 105, and it is energized to the valve seat side by the electromagnetic force. As a result, when the feeding current value to the electromagnetic coil 105 is converted, the differential pressure between the both chambers 2 and 10 is converted, and thereby the inclination of the swash plate 6 is converted. Consequently, the capacity of the compressor 51 is controlled. |
