Universal long stroke pump system
US4226404A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 7, 1977 |
| Grant date | Oct 7, 1980 |
| Priority date | — |
| Expiry date | Mar 7, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B47/04
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The long-stroke pumping apparatus has a frame, a drum, and a pair of sheaves mounted on the frame. A traction cable is carried by the drum. A cable connector is connected to one end of the traction cable which is guided over one sheave into an oil well. A counterweight assembly is connected to the other end of the traction cable which is guided over the other sheave into a counterweight well. A reversible power means, preferably a hydraulic motor, rotates the drum a number of turns in one angular direction and then in an opposite direction during one complete stroke of pumping operation. A load cable is also supported and guided by the sheaves, and the cable connector and the counterweight assembly are also suspended from the opposite ends of the load cable. The load cable is not drivingly connected to the drum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.