Patent ID: 6612167
Filing Date: 2003-09-02
Classification: G01F

Abstract:
An air flow meter for measuring flow amount of air flowing in an air passage, comprising:a U-shaped bypass passage, into which a part of the air is introduced, provided in said air passage, said bypass passage arranged substantially perpendicularly to a primary air flow direction in said air passage and defining an air inlet; a flow meter element disposed in said bypass passage; and a turbulence reduction plate provided adjacent the air inlet of said bypass passage, wherein said turbulence reduction plate extends substantially in parallel with the primary air flow direction in the air passage, and substantially perpendicularly to an air flow direction in said bypass passage, said turbulence reduction plate is disposed at a position of said air inlet, which is opposite to said flow meter element, said bypass passage includes two fluid passages next to and in parallel with each other, and a bent portion connecting the two fluid passages, the two fluid passages are partitioned by a partition wall, a venturi is formed within said partition wall at the air inlet side thereof, and said turbulence reduction plate is disposed at a position facing around a center of said venturi.