Fluid-flow assisting devices
US4037991A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 1975 |
| Grant date | Jul 26, 1977 |
| Priority date | — |
| Expiry date | Sep 15, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04F5/466
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An inlet line connected to the inlet of a hydraulic pump includes a jet pump having a Venturi nozzle though which the aspired liquid is passed, and into which a coaxial jet of liquid under higher pressure is introduced to raise, by jet-pump action, the pressure of the liquid at the pump inlet. In order to increase the efficiency of pressure recovery in the diffusor part of the Venturi nozzle, fuel under higher pressure than the aspired liquid fuel is also introduced into the flow of incoming fuel through the wall of the Venturi nozzle, at a point preceding the throat, via inlet slots so arranged that, when there is a flow of fuel through the nozzle passage, the Coanda effect of the additional fuel thus introduced causes the thus introduced fuel to form a layer moving along the walls of the throat and diffuser portion of the Venturi nozzle, and separating the stationary surface of the throat and diffusor walls from the flow of fluid obtained by the action of the central jet, thereby counteracting the tendency to wall detachment which in conventional jet pumps is caused by boundary-layer action.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.