Backflow preventer and engine EGR system
US11041467B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 2017 |
| Grant date | Jun 22, 2021 |
| Priority date | — |
| Expiry date | Dec 27, 2037 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M35/10275
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A backflow preventer, including one or multiple reducing rings that are disposed in a pipeline; the outer edges of the reducing rings are connected to the inner wall of the pipeline; the multiple reducing rings are arranged along the axis of the pipeline; and the actual internal area of the reducing rings are gradually decreased in the axial direction of the reducing rings. Further disclosed is an engine EGR system including the backflow preventer. The backflow preventer can generate, according to different flowing directions in a pipeline, throttling losses of different degrees; when an air flows in a direction (forward direction) in which the actual internal area of the reducing rings decreases, the throttling loss is small; and when then air flows in a direction (reverse direction) in which the actual internal area of the reducing rings increases, the throttling loss is large.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.