초록 ▼

A pair of end plates are maintained in a spaced apart relationship by a plurality of guide rods secured therebetween. A carriage defines a plurality of apertures which receive the guide rods and which provide slidable support for the carriage between the end plates. An elongated externally threaded

A pair of end plates are maintained in a spaced apart relationship by a plurality of guide rods secured therebetween. A carriage defines a plurality of apertures which receive the guide rods and which provide slidable support for the carriage between the end plates. An elongated externally threaded pump screw is rotatably supported between the end plates and is coupled to a bi-directional motor. A ball nut is secured to the movable carriage which engages the pump screw such that rotation of the pump screw in either direction produces a corresponding vertical movement of the carriage between the end plates. A first plurality of pump sections having respective fluid cylinders and pump rods operative therein are coupled between the carriage and one of the end plates. A second plurality of pump sections also having respective fluid cylinders and pump rods are operatively coupled between the carriage and the remaining end plate. The first and second pluralities of pump sections are coupled to a fluid supply and a high pressure output line by a crossover valve. The motor is driven for rotation in a first direction to drive the carriage toward the lower end plate and in a second direction to raise the carriage toward the upper end plate thereby operating each pump section to produce a double acting rod pump. A sensor and pair of targets is operative to limit the extent of travel of carriage between a maximum upper position and a maximum lower position.

대표청구항 ▼

1. A double-acting rod pump comprising:a frame support; a carriage slidably movable upon said frame support in first and opposed directions; at least one first rod pump section coupled to said carriage and said frame support; at least one second rod pump section coupled to carriage and said frame su

1. A double-acting rod pump comprising:a frame support; a carriage slidably movable upon said frame support in first and opposed directions; at least one first rod pump section coupled to said carriage and said frame support; at least one second rod pump section coupled to carriage and said frame support in an operational relationship opposite to said at least one first rod pump section; a pump screw rotatably supported by said support frame; a bi-directional motor for rotating said pump screw in first and second rotational directions; engagement means on said carriage for engaging said pump screw such that first and second rotational direction rotation of said pump screw moves said carriage in opposed first and second direction movement; and valve means coupled to said at least on first rod pump section and said at least one second rod pump section for controlling fluid flow to and from said first and second rod pump sections.