PURPOSE: To prevent a vane tip from imposing excessive pressure contact on the inner circumferential surface of a cylinder, by installing a high pressure groove, which makes discharge pressure act on a back pressure chamber of a vane, for the duration the vane tip is shifted to a position at the initial stage of suction stroke by way of a top position from the discharge completion position.
CONSTITUTION: For the duration the tip of a vane 16' is shifted to a position at a suction stroke initial stage B by way of a top position T from an almost nearly discharge completion position A, a high pressure groove 26 to make the discharge pressure act on a back pressure chamber 15a of a vane 16 is installed. With this, for the said buration when compressive operation does not take place, pressure in the back pressure chamber 15a can be released from such pressure as higher than the discharge pressure whereby the tip of the vane 16' avoids pressing excessively on the inner circumferential surface of a cylinder 1, reducing power loss to a degree, and wear in a vane 16 or the like can be lessened. Also, for the duration the vane 16' is shifted to a position corresponding to the succeeding vane 16 to form a compression chamber 17 at a time when the compression chamber 17 is interconnected to a discharge port 19, from the suction stoke initial stage B, an intermediate pressure groove 28 to interlock the back pressure chamber 15a is installed, thus an unusual high pressure ratio of the compression chamber 17 is prevented.
| WO/2004/033857 | ROTARY SLIDING VANE COMPRESSOR |
| JPH04124489 | ROTARY COMPRESSOR |
| JP2008014174 | COMPRESSOR |
IKEDA ISATO
KATOU KIMIO
| JPS57117782U | 1982-07-21 |