To reduce pulsation by reducing differential pressure between internal compression pressure and discharge pressure.
Adjacent compression chambers 10a, 10b are communicated with each other in the axial direction of rotors 1, 2. Thus, the amount of air leaking and flowing from the compression chamber 10b on a high pressure side into the compression chamber 10a on a low pressure side is greater than in the case that a groove 41 is not provided. On the other hand, the amount of air leaking from the compression chamber 10a on the low pressure side into a compression chamber 10c on a further low pressure side than the compression chamber 10a on the low pressure side is equal to that in the case that the groove 41 is not provided. Pressure in the compression chamber 10a on the low pressure side is therefore higher than in the case that the groove 41 is not provided. Thus, the internal compression pressure is increased and so the differential pressure between the discharge pressure and the internal compression pressure is smaller than conventional one, which reduces the noises of pulsation resulting from discharge pulsation.
Takahiro Miura
Fumihiro Mizuno
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