| 摘要 |
<p>PROBLEM TO BE SOLVED: To eliminate a replenishing valve for hydraulic fluid, and simplify a mechanism by making both axial lengths of a recessed part on an inner circumferential surface of a cylinder and an opening part on an outer periphery surface of a piston differ from each other, and regulating a suction and delivery rate of a fluid. SOLUTION: A cylinder 2 provided with a recessed part 10 on its inner circumferential surface, is rotatably mounted on a device main body 12. A liquid circulating passage 14 provided with an opening is arranged on an outer peripheral surface of a piston 3. The cylinder 2 is rotated by a control bar 20, during reciprocating motion of the piston 3, the circulating passage 14 is closed at the inner circumferential surface of the cylinder at all times without matching with the recessed part 10. As a result, a tubular phragm 5 is contracted and expanded, and then a pump is operated in a pump chamber 6. A pump operation stop period is set in all strokes of the piston 3, and an absorbing and delivery rate is regulated. In order to regulate the rate, the cylinder 2 is rotated, the liquid circulating passage 14 is matched with the recessed part 10 during the reciprocating motion of the piston 3, the circulating passage 14 is turned into a circulating condition. Otherwise the circulating passage 14 is closed without matching with the recessed part 14, and turned into a suspended condition.</p> |
