VALVELESS DOUBLE ACTING POSITIVE DISPLACEMENT FLUID TRANSFER DEVICE

摘要

A valveless, double acting, positive displacement fluid transfer device (10) is operable either as a pump when driven by a power source (22), or as a motor when the fluid working portion is driven by fluid under pressure through the inlet and outlet ports (80 and 82) of the device. The plunger (60) and cylinder (62) are angularly offset from a rotary shaft, and connected to the rotary shaft by a radial arm (26) and a spherical bearing (34). The plunger simultaneously rotates and reciprocates as the rotary shaft revolves, due to the plunger stroke varying cyclically due to the angular offset, as the plunger rotates within the cylinder. The plunger includes separate internal inlet and outlet passages (64 and 66) therethrough, which cyclically communicate with an inlet port and an opposite coaxial outlet port in the cylinder.