Hydraulic fluid generator

摘要

Two sources of water with a temperature differential of say 20 DEG F. flow alternately through heat exchanger tubes to expand and contract a working liquid that has a high coefficient of thermal expansion, the whole working cycle being carried out below the boiling point of the working liquid. With check valves preventing reverse flow, the expansion and contraction of the working liquid provides a high pressure hydraulic output which may be used to drive a hydraulic motor. To provide substantially steady output flow, four banks of heat exchangers may be operated sequentially with hydraulic accumulator means smoothing out the flow pulsations. Each bank has a four-stage operating cycle and electrical circuitry controls the four banks simultaneously to cause the four different stages to occur in certain of the four different banks in staggered relation for producing a substantially constant overall hydraulic output.