DOUBLE RECIPROCATION PUMP

摘要

Disclosed is a double reciprocation pump wherein a pump operation is always stable, and pulsation is dampened. A pair of spaces are formed in the inside of a case member (2) in the axial direction of the case member (2). Each of movable partition members (3) is disposed so as be deformable in each of the pair of spaces in the axial direction of each space, so that each space is divided into a pump chamber (5) and an operation chamber (6) in the axial direction of each space. Coupling shafts (11) couple the movable partition members (3) via extendable members (14) so that the movable members (3) can extend in the axial direction thereof. Valve mechanisms (27) introduce a working fluid to the operation chambers (6), and discharge the working fluid from the operation chambers (6). A controller (25) switches the valve mechanisms (27) so that a distance of an overlapped portion in which a compression stroke of one pump chamber (5) and a compression stroke of the other pump chamber (5) are partially overlapped to each other, is formed, on the basis of the output of a displacement sensor (23) which continuously detects the displacement of each of the pair of movable partition members (3).