Patent ID: 8899279
Filing Date: 2014-12-02
Classification: F04B,F17C

Abstract:
1. A method for compressing a gaseous fuel for fueling a vehicle comprising alternately supplying gas into two vertically arranged compressing vessels comprising a first compressing vessel and a second compressing vessel ( 1 and 2 ), each having one neck in the upper part thereof, further compressing the gas and forcing the gas out of said vessels and into a fuel tank of the vehicle by alternately filling the compressing vessels with a working fluid under pressure wherein each cycle comprising alternate filling of the compressing vessels is carried out until said vessels are completely filled with working fluid and the working fluid is alternately pumped from one compressing vessel into the other, wherein, during each cycle, the working fluid travels directly from the first compressing vessel into the second compressing vessel and returns from the second compressing vessel directly into the first compressing vessel without traveling through any intermediate vessels such that said travel of the working fluid is performed until its flow reaches the lower edge of a movable closing element of a shut-off device mounted in said upper neck of the compressing vessel, and displaces said movable closing element in an outlet gas channel of said shut-off device upwards from its lower position, thus closing the seat of a valve of an outlet pipeline for pumping the gas into fuel tank of the vehicle with a tapered portion of said movable closing element before said working fluid reaches said seat of the valve of said outlet pipeline for pumping the gas into fuel tank of the vehicle, said upward movement of the movable closing element activating a fluid-level sensor placed at the outer side of the body of the shut-off device, which generates a Signal for a control unit to change the direction of pumping the working fluid to reverse mode for a new similar cycle of pumping the working fluid from the compressing vessel ( 2 or 1 ) which is completely filled therewith to the other compressing vessel ( 1 or 2 ) which is filled with gas and working fluid, where the amount of said working fluid is enough for compensation of the possible difference of inner volumes of compressing vessels ( 1 and 2 ).