Thermal flow meter with a protrusion having an orifice surface and recovery surface provided on a wall surface of a bypass passage
US9709428B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2013 |
| Grant date | Jul 18, 2017 |
| Priority date | — |
| Expiry date | Nov 29, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F15/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
To improve measurement accuracy of a thermal flow meter. The present invention provides a thermal flow meter, in which a protrusion 356 having an orifice surface 503 and a recovery surface 505 is provided on a wall surface 501 of a bypass passage, an intersection line 506 between the orifice surface 503 and the wall surface 501 is arranged in an upstream side from an upstream side end 401 of a circuit package 400, an intersection line 507 between the recovery surface 505 and the wall surface 501 is arranged in a downstream side from a downstream side end 402 of the circuit package 400, and an apex 504 of the protrusion 356 is arranged in a downstream side from a heat transfer surface of an air flow sensing portion 602 and in an upstream side from the downstream side end 402 of the circuit package 400.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.