| 摘要 |
PURPOSE:To obtain a required factor of volume control, by providing a cut in a cylinder correspondingly to an opening face in the outside of a cylinder internal diameter and ensuring opening area of a conducting hole communicated to an intermediate pressure part in the cylinder. CONSTITUTION:Area of an opening face 21 of a conducting hole 20 communicated to an intermediate pressure part in a cylinder 10 is formed such that the outside is larger than the inside of an internal diameter of the cylinder 10, further an opening face 21a in the inside of the internal diameter of the cylinder 10 is formed such that the face 21a is never opened to an internal part 11a of a roller 11 in any rotary position of the roller 11 eccentrically rotated in the cylinder 10. In this way, high temperature gas at high pressure in the inside of the roller 11 can be prevented from infiltrating in a suction chamber through the hole 20 and a decrease of volume efficiency can be prevented. Further since a cut 22 is provided in the cylinder 10 correspondingly to an opening face 21b in the outside of an internal diameter of the cylinder 10, area of the face 21 of the hole 20 is ensured, and a required factor of volume control can be obtained without causing the decrease of a gas delivery amount at volume control. |
