| 摘要 |
PURPOSE:To reduce the intensity of generated shock waves for aiming at reducing pulsation in a compression chamber, by forming, in the inner wall of a cylinder in the direction of the rotor reversing from a discharge port, a slight spill groove which is contiguous to the discharge port so that the high pressure gas section is gradually communicated with a low pressure chamber. CONSTITUTION:High pressure gas compressed in a high pressure chamber 6b is discharged therefrom through a discharge valve 7 which is opened when the high pressure exceeds its discharge pressure. During this compressing step, when each vane 3 passes through in the vicinity of a discharge port 7, the high pressure gas section in the vicinity of the space 11 in the discharge port 7 is gradually communicated with the low pressure chamber 5a by such an effect of a spill groove 8, formed in the inner wall of a cylinder 1, that a slight communication is established between the high pressure gas section in the vicinity of a space 11 within the discharge port 7 and a low pressure chamber 5a in a period from the timing which is an earlier crank angle position from the discharge port 7 to the timing at which each vane 3 advances, and therefore, the intensity of a generated shock waves is decreased. As a result, the level of noise due to the shock waves may be greatly reduced. |
