Patent ID: 8181514
Filing Date: 2012-05-22
Classification: G01F

Abstract:
1. A flow rate measuring apparatus comprising: a main body portion comprising: a bypass passage that is formed on said bypass passage forming member and through which a portion of a measured fluid that flows through said main passage is allowed to flow; a flow rate detecting element that is disposed inside said bypass passage and that has a detecting portion on a surface; and a control circuit that is housed inside said circuit housing portion and that drives said flow rate detecting element and processes a signal therefrom, wherein: said bypass passage forming member has: said bypass passage has: the flow direction-changing means comprising a pair of inclined surfaces formed by relieving intersecting portions between said front surface and said side surfaces of said bypass passage forming member, the pair of inclined surfaces intersecting each other at a position that is in a common plane with said front surface, extending in said direction of projection of said bypass passage forming member for a predetermined range and extending over an entire region of said front surface of said bypass passage forming member in the horizontal direction, the flow direction-changing means making the measured fluid that collides with the front surface of said bypass passage forming member within said pair of inclined surfaces formed by the relieving intersecting portions to flow in the horizontal direction.