| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce invalid power when four compression chambers are formed. <P>SOLUTION: A compression mechanism includes: a first compression part C1 at the innermost circumference; a second compression part C2 adjacent to an outer side of the first compression part C1; a third compression part C3 adjacent to an outer side of the second compression part C2; and a fourth compression part C4 adjacent to an outer side of the third compression part C3. Discharge ports P12 to P14 of the second to fourth compression parts C2 to C4 are arranged on a straight line parallel to a blade 24 to form a port row 90. A first discharge port P11 in the first compression part C1 is structured as a displacement port positioned at a place more separated from the blade 24 than the port row 90. The first compression part C1 includes a communication part 91 communicating the displacement port P11 with a compression chamber 23a formed after a piston fully closes the displacement port P11. <P>COPYRIGHT: (C)2013,JPO&INPIT |
