Flow measurement apparatus
US7523659B2 · kind B2 · utility
6Cited by
8References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 3, 2007 |
| Grant date | Apr 28, 2009 |
| Priority date | — |
| Expiry date | May 3, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F5/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a thermal type flow rate measurement apparatus comprising a sub-passage having a detour passage and a hole just before a flow rate measuring part, for preventing its output value from falling onto a negative side when the flow rate is abruptly changed, a slit is formed downstream of a flow rate detecting element located after the detour passage. The slit hole may be arranged between the flow rate detecting element and the outlet port part, and may be opened between a wall surface side and a recess part. Thereby, it is possible to prevent the output value from falling in the negative side upon rise-up thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.