초록 ▼

A positive displacement reciprocating pump for conveying a liquid or gaseous fluid is disclosed and which comprises a fluid enclosure having a movable piston means mounted therein which sealably divides the enclosure into a pumping chamber on one side and an actuating chamber on the other side. The

A positive displacement reciprocating pump for conveying a liquid or gaseous fluid is disclosed and which comprises a fluid enclosure having a movable piston means mounted therein which sealably divides the enclosure into a pumping chamber on one side and an actuating chamber on the other side. The piston means may comprise either a slideable piston or a flexible diaphragm. An inlet valve and a separate outlet valve are each connected to the pumping chamber, and a control system is provided for intermittently supplying a pressurized working fluid to the actuating chamber so as to intermittently move the piston means in the discharge direction, with the piston means being moved in the opposite or suction direction by either the pressure of the fluid being conveyed, or a suitable spring. The control system for advancing the piston means in the discharge direction includes a source of pressurized working fluid, a working fluid line extending between the source and the actuating member, and a valve operatively connected to the working fluid line for intermittently opening the line to a discharge tank or the like to release the pressure therein.

대표청구항 ▼

A positive displacement reciprocating pump for conveying a liquid or gaseous fluid, and comprising a fluid enclosure, movable piston means disposed in said enclosure and sealably dividing the enclosure into a pumping chamber on one side of the piston means and an actuating chamber on the other side

A positive displacement reciprocating pump for conveying a liquid or gaseous fluid, and comprising a fluid enclosure, movable piston means disposed in said enclosure and sealably dividing the enclosure into a pumping chamber on one side of the piston means and an actuating chamber on the other side thereof, an inlet valve and a separate outlet valve each communicating with said pumping chamber, control means for intermittently supplying a pressurized working fluid to said actuating chamber so as to intermittently move said piston means along a stroke which extends in a direction toward said pumping chamber and thereby discharge the conveyed fluid from such chamber, said control means including a source of pressurized working fluid adapted to deliver a substantially constant flow of working fluid, a working fluid line extending between said source and said actuating chamber for delivering such constant flow to said actuating chamber, and valve means operatively connected to said working fluid line for intermittently opening said line to a discharge tank or the like to release the pressure therein, said control means further including means for actuating said valve means in a sequence of working times and idle times, with each of the working times consisting of a closed time period wherein pressure is maintained in said working fluid line and an open time period wherein said pressure is released in said line, with each of said working times being of essentially uniform duration and with the closed time periods of the working times being of essentially uniform duration which is sufficient to move said piston means along its predetermined stroke, and with the pressure in said line being released during said idle times.