Patent · US Expired

Fluid flow meter having thermal flow sensor disposed in one of a plurality of fluid passages

US6619140B2 · kind B2 · utility

13Cited by
11References
14Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMay 29, 2001
Grant dateSep 16, 2003
Priority date—
Expiry dateMay 29, 2021

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01F1/6842
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A separator partitions an upstream side air passage of a bypass passage into first and second sub passages. A thermal flow sensor is attached to the separator facing the first sub passage. A convex is formed on the inner wall of an outer pipe defining the second sub passage. The convex protrudes toward the separator. Minimum flow passage area S2 of the second sub passage is smaller than minimum flow passage area S1 of the first sub passage, so that flow passage loss of the second sub passage is larger than flow passage loss of the first sub passage. Thus, measured air-flow amount average when the air-flow pulsates is corrected to be larger.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.