Low noise fuel pump unit
US5772393A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1996 |
| Grant date | Jun 30, 1998 |
| Priority date | — |
| Expiry date | Oct 17, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05B2260/96
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a fuel pump unit including a substantially disc-like rotating impeller, a pump casing for accommodating the impeller, the pump casing having a pressurizing passage surrounding an outer peripheral edge of the impeller and extending along the outer peripheral edge from its upstream end to downstream end, an inlet hole communicating with the upstream end of the pressurizing passage, an outlet hole communicating with the downstream end of the pressurizing passage, and a partition wall formed at a range circumpherentially upstream of the upstream end and downstream of the downstream end of the pressurizing passage, the improvement comprises a cutout slot formed at an end of the partition wall facing the outlet hole, the width of the cutout slot in an axial direction being gradually reduced as the cutout slot extends from the end of the partition wall in a circumferentially downstream direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.