| 摘要 |
<p>An apparatus for pumping a fluid, said apparatus comprising substantially a housing (1) with two or more parallel cyclindrical pump chambers (2) in each of which a piston (10) is reciprocally moveable, said piston (10) is connected via a piston-rod (13) to a rocker-piece (21) mounted on a driving shaft (22) parallel to the cylinders and rotatably journalled in the housing, wherein the piston-rod (13) is connected at one end fixedly to the piston (10) and at the other end movably to the rocker-piece (21), the piston-rod (13) being at the piston-end tiltable around a transverse axis with respect to the housing (1), and wherein a bush (15) of a hard material such as ceramic material is fitted around the piston (10), said bush cooperating with one or more sealing means (16, 17), in order to avoid wear at the usual joints between the piston-rod (13) and piston (10) and leakage over the sealing (16, 17) between the compression and drive side respectively. </p> |
