Method and Apparatus for Improving the Operation of Positive Displacement Expanders

A linear or rotary positive displacement expander ( 10 ) is fed by compressed gas or vapour from a reservoir ( 11 ) by means of a fast acting pulsed flow control valve ( 12 ) actuated by a PWM microprocessor ( 13 ) which receives input data from the expander ( 10 ) and the reservoir ( 11 ) to determ...

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Bibliographische Detailangaben
Hauptverfasser:	REDFORD SIMON JAMES, HENSHAW IAIN JAMES, DERBY JAMES WILLIAM, BENSTEAD RUSSELL
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR ENGINE PLANTS IN GENERAL FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS HEATING HYDRAULICS OR PNEUMATICS IN GENERAL LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES STEAM ENGINES SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	A linear or rotary positive displacement expander ( 10 ) is fed by compressed gas or vapour from a reservoir ( 11 ) by means of a fast acting pulsed flow control valve ( 12 ) actuated by a PWM microprocessor ( 13 ) which receives input data from the expander ( 10 ) and the reservoir ( 11 ) to determine the correct operation of the valve ( 12 ). By injecting single or multiple controlled volume pulses of gas into the expander ( 10 ), the need for additional pressure regulation between the reservoir ( 11 ) and the expander ( 10 ) is eliminated, and the expander can operate efficiently within its built-in pressure ratio capability whereby the gas or vapour is expanded to be as close as possible to ambient pressure at the outlet of the expander.