Airflow meter having an inverted u-shape bypass passage

Details Airflow meter having an inverted u-shape bypass passage Airflow meter having an inverted u-shape bypass passage

1997-04-22

1998-09-08

Dombroske, George M.

Measuring and testing

Volume or rate of flow

Proportional

731182, G01F 500

Patent

active

058047182

ABSTRACT:
An airflow amount measuring body is formed such that two pipes are arranged in parallel and a bypass passage having an inverted U-shape is provided. The passage sectional areas A1, A2 and A3 of an upstream side passage, a turning section and a downstream passage of the bypass passage are set as A1<A2 and A1<A3, more preferably A2/A1.gtoreq.1.14 and A3/A1.gtoreq.1.20 to suppress contraction flow. A venturi tube section is provided at the lower end of the flow amount measuring body at the peripheral wall of the venturi tube section at the downstream side. A passage enlarging section is provided at the part of the peripheral walls of the venturi tube section at the downstream side where the bypass flow joins, and a guide section for guiding the bypass flow is provided at an outflow port of the bypass passage.

REFERENCES:
patent: 3557482 (1971-02-01), Baker et al.
patent: 4571996 (1986-02-01), Wakeman et al.
patent: 5467648 (1995-11-01), Igarashi et al.
patent: 5537870 (1996-07-01), Zurek et al.
patent: 5571964 (1996-11-01), Sawada et al.

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