Patent ID: 7661877
Filing Date: 2010-02-16
Classification: G01F

Abstract:
1. A thermal flow detecting apparatus for detecting fluid flow in a flow passage, the thermal flow detecting apparatus comprising: a bypass passage portion defining therein a bypass passage through which fluid bypasses the flow passage; a detecting element that is provided in the bypass passage portion, the detecting element having a longitudinal axis disposed perpendicularly to fluid flow through the bypass passage portion and eccentrically displaced from a center of a cross section of the bypass passage portion; and a throttle portion provided upstream of the detecting element in the bypass passage portion for throttling the cross section on a side of the eccentrically disposed detecting element and perpendicularly to the longitudinal axis, wherein the throttle portion is disposed on an internal wall of the bypass passage, the internal wall being perpendicular to the longitudinal axis, and the throttle portion is eccentrically disposed from the center of the cross section of the bypass passage.