| 摘要 |
PURPOSE:To reduce noise by positioning either of a position where refrigerant enters an expansion chamber or a position of a hole out of which refrigerant is discharged at the longitudinal end of the expansion chamber and the other at the position about 1/2 of the length of the expansion chamber. CONSTITUTION:A recess 19 communicating via a small groove 18 with a recess 17 is arranged on a rotor side bearing 16 at a position outside the periphery of a surface 16c which is in close contact with a flat surface of a cylinder 7 on the cylinder side surface 16b of the bearing 16. A partition plate 21 is provided with a hole 21a at a position corresponding to about 1/2 of the longitudinal length of the recess 19 of the bearing 16. Accordingly, noise can be reduced by obtaining an expansion type silencing effect of 1/2 insertion type.
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