Double-acting rod pump
US6398514B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Nov 22, 2000 |
| Grant date | Jun 4, 2002 |
| Priority date | — |
| Expiry date | Nov 22, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B17/03
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.