| 摘要 |
PROBLEM TO BE SOLVED: To exhibit high efficiency and high reliability with an easy and inexpensive structure. SOLUTION: In addition to the suction, compression and delivery of a fluid by making the rotating scroll 2 of a compression mechanism part 14 take a circular orbital motion to a fixed scroll 1, the liquid is supplied from a liquid basin part 25 provided on the other end side of a shaft 8 through the shaft 8 for driving the rotating scroll 2 on one end side to the compression mechanism part 14 followed by lubrication, and then supplied to the back part of the rotating scroll 2 to make a back pressure for pressing it to the fixed scroll 1 side act thereon. At this time, intermittent communication in two positions in a liquid supplying route 100, or intermittent communication in one position in a liquid release route 103 and intermittent communication in one position in the liquid supplying route 100 are performed according to the rotation of the shaft 8 to adjust the supplying quantity or release quantity of the liquid to a back pressure working area 32, whereby the drive is performed while keeping the back pressure in a prescribed range.
|
