Patent ID: 7661303

Claim:
An airflow measuring device provided to a main passage, the airflow measuring device comprising: a bypass passage defined in part by a bypass wall surface disposed transverse to a direction of airflow in the main passage to perpendicularly intercept and deflect a part of an airflow in the main passage into said bypass passage as bypass airflow; and a sensing portion provided in the bypass passage, wherein the sensing portion includes a heating resistor configured to be energized and radiate heat to said bypass airflow, the sensing portion being configured to measure bypass airflow in the bypass passage based on the heat radiation, the sensing portion further includes a pair of support members erected in the bypass passage to support the heating resistor, a longitudinal axis of the heating resistor being inclined at a first inclination angle (θx) with respect to a direction, which is perpendicular to a flow direction of bypass airflow in the bypass passage, and so that the heating resistor is inclined a downstream direction with respect to the bypass airflow in the bypass passage with a downstream end of the heating resistor being at a side of the bypass wall surface, causing a velocity component Vx along the heating resistor to reduce stagnation in airflow and influence a velocity distribution of the airflow through the bypass passage, the pair of support members extend in the direction of airflow in the bypass passage.