Air flow rate measuring apparatus
US6868722B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 2004 |
| Grant date | Mar 22, 2005 |
| Priority date | — |
| Expiry date | Feb 9, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F5/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A diversion passage is constructed into an inverted U shape in which an upstream diversion passage and a downstream diversion passage each having a passage direction in a direction of projection of a detector flow tube communicate by means of a curved portion. An inflow port is constructed by removing a portion of a wall of the upstream diversion passage on an upstream side in the main direction of flow, and removing a portion of first and second side walls of the upstream diversion passage facing each other in a direction perpendicular to the main direction of flow and the direction of projection of the detector flow tube. In addition, a wall surface on a downstream side of the upstream diversion passage in the main direction of flow at the inflow port is formed into a curved surface shape that is gradually displaced upstream relative to the direction of projection of the detector flow tube to constitute an air lead-in surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.