Patent ID: 7415895

Claim:
A flow meter comprising a main body section with a flow passage formed therein for allowing a fluid to be measured to pass therethrough, and a flow velocity sensor fixed to a seating surface facing said flow passage for detecting a flow velocity of said fluid to be measured that flows through said flow passage, said flow meter further comprising: a rectifying mechanism disposed on an upstream side of said flow passage arranged with said flow velocity sensor, wherein said rectifying mechanism comprises a rectifying module including a plurality of non-lattice shaped mesh members formed with a plurality of circular small holes therein and ring-shaped spacers, said plurality of mesh members and said plurality of spacers being alternately stacked in an axial direction and integrally joined to one another, and wherein said mesh members have identical structures, in which said plurality of small holes are concentric and are separated from each other by equal angles in a circumferential direction about a center of a reference small hole in a continuous relationship, and wherein a phase angle difference is provided in said circumferential direction between one mesh member and another mesh member, which are adjacent to each other in said axial direction, so that overlapping portions are provided between said circular small holes of said one mesh member and said circular small holes of the other mesh member corresponding thereto in said axial direction.