Hot-wire mass flow sensor with low-loss bypass passage
US6973825B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2003 |
| Grant date | Dec 13, 2005 |
| Priority date | — |
| Expiry date | Feb 24, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/6842
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A mass fluid flow sensor includes an internal bypass passage characterized by a first section that converges along a first axis to define a nozzle, and a radially-expanded generally-cylindrical second section immediately adjacent to and coaxial with the first section so as to define a radial step at the nozzle exit. The passage further includes a semispherical third section adjacent to the second section having the same nominal diameter, a converging fourth section whose nominal axis is disposed at a right angle to the nominal axis of the first and second sections, and a fifth section adjacent to the fourth section that includes a further ninety degree bend. The resulting U-shaped passage features reduced pressure losses and an improved velocity profile, whereby the performance of a sensing element disposed in the passage proximate to the radial step is improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.