Patent ID: 7523659
Filing Date: 2009-04-28
Classification: G01F

Abstract:
1. A heat resistance element type flow rate measurement apparatus comprising: a sub-passage constituting member defining a sub-passage having an inlet port and an outlet port, and a curved part therebetween; a resistance element provided in said sub-passage and heating by applying current; and a communicating aperture provided in said curved part of said sub-passage or upstream thereof for communicating between said sub-passage and a main passage, in which said resistance element is provided downstream of said curved part in said sub-passage, and an inlet port of said sub-passage is provided at a position inside of said main passage, wherein a second communicating aperture for communicating between said sub-passage and said main passage is provided between an outlet of said sub-passage and said resistance element, wherein said second communicating aperture is opened to an inside of a recess part provided on a surface of said sub-passage constituting member on said main passage side along a flow direction in said main passage, wherein said second communication aperture connects between an inside portion of said sub-passage on a side closer to said outlet port than said resistance element, and said main passage, and has one end opened in the vicinity of said resistance element in said sub-passage.