GB467504A - Improvements in and relating to fluid-pressure power installations - Google Patents

Abstract

467,504. Reciprocating engines; marine power plant. WHITE, W. A., and WHITE'S MARINE ENGINEERING CO., Ltd. Dec. 13, 1935, No. 34680. [Classes 110 (iii) and 122 (iii)] Comprises a condensable, fluidpressure reciprocator with two or more stages, in which the crankangles are chosen to give a good mechanical balance, and superheating is effected between the stages so that the low-pressure cylinder does more work than a higher-pressure cylinder in the ratio of from 1À3 to 1 to 1À1 to 1. In a specific construction, the H.P. cranks are at 55‹ and the L.P. cranks at 108‹ apart. In the double-compound engine shown, which may be used in the power-plant described in Specification 362,255, high and low-pressure cylinders A<1>, A<2>, B<1>, B<2> are arranged as shown. The low-pressure cylinders are adapted to do more work than the high-pressure cylinders in the ratio of 1À3 to 1. The H.P. exhaust is superheated by superheated steam before entry into the L.P. cylinder. The reheater comprises heat-transferring units C<1>, C<2> with internal tubes c secured to the backs of the engine and fed with superheated steam through a fitting D, the steam passing through a pipe e to the H.P. valve chests. The H.P. cylinders exhaust, through pipes f, f and the heaters C<1>, C<2> to the L.P. chests b<1>, b<2> respectively. The L.P. cylinder's exhaust from pipes i, i<1> passes through a pipe k to the turbine, or by a change-over-valve to the condenser. The reheater tubes may be bent to conform to the plan of the engine. Instead of a three power-shaft arrangement as described in the above Specification, the crankshaft may drive directly the propeller shaft, and the turbine geared to it. Alternatively, the turbine may drive the auxiliaries. The reciprocating-engine may be used alone.