Compensated vane airflow meter
US4317374A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 15, 1980 |
| Grant date | Mar 2, 1982 |
| Priority date | — |
| Expiry date | May 15, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F15/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An airflow sensor with a rectangularly shaped sensing vane is disclosed. The vane is pivotally mounted in a cylindrical bore perpendicular to the airflow direction of the sensor and yields an airflow signal proportional to its angular rotation. An air motor mechanically coupled to the vane maintains a constant pressure drop across the vane. The air motor assists in pivoting the vane by magnifying the force on the vane for changes in airflow. In one embodiment, a gas filled bellows modifies the positioning of the vane by the air motor to compensate for temperature and barometric variations. In another embodiment, an absolute pressure sensor, located between the vane and a throttling member, compensates for barometric changes and transient delays in the response of the vane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.