Thermal air flow meter
US4513615A · kind A · utility
24Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1983 |
| Grant date | Apr 30, 1985 |
| Priority date | — |
| Expiry date | Dec 5, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B2075/027
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A thermal air flow meter consists essentially of a hollow cylindrical support made of an insulating material, a heat-sensitive resistor formed on top of the support, and lead wires inserted into the hollow part of the support from either end and bonded thereto by glass. This flow meter measures the flow rate from changes in the resistance of the heat-sensitive resistor with temperature. The ratio of the inner diameter d.sub.2 of the support to the outer diameter d.sub.3 of the lead wires (d.sub.2 /d.sub.3) is at least 1.7. This arrangement can provide a thermal air flow meter with a quick response to changes in flow rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.