Title:
FLOW SENSOR
Document Type and Number:
Japanese Patent JPH02193019
Kind Code:
A
Abstract:
PURPOSE:To enable the suppressing of temperatures of a first and second resistance bulbs in the detection of a flow rate by arranging the first resistance bulb, a heat generating body and the second resistance bulb sequentially from the upstream to the downstream of a flow of a gas. CONSTITUTION:As a gas moves from the direction of the arrow 11, a resistance thermometer element 8 on the upstream side is cooled to lower the temperature thereof. On the other hand, in a resistance thermometer element 9 on the downstream side, heat conduction is promoted from a heater element 7 with a flow of the gas as medium and the temperature thereof rises, which causes a difference in temperature between both the elements. When a sensor thus obtained is incorporated into a Wheatstone bridge circuit, a flow velocity of the gas can be detected. In this manner, heat of the element 7 is transmitted to the elements 8 and 9 with the gas as medium only. Thus, there is no heat transmitted through a base material of a bridge part without depending on the flow of the gas thereby achieving a higher sensitivity in the detection of a flow rate.
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Inventors:
OSADA MITSUHIKO
JOUNTEN SHOJI
JOUNTEN SHOJI
Application Number:
JP6770189A
Publication Date:
July 30, 1990
Filing Date:
March 22, 1989
Export Citation:
Assignee:
YAMATAKE HONEYWELL CO LTD
International Classes:
G01P5/12; G01F1/68; G01F1/692; (IPC1-7): G01F1/68; G01P5/12
Domestic Patent References:
| JPS60142268A | 1985-07-27 | |||
| JPS61170618A | 1986-08-01 |
Attorney, Agent or Firm:
Masaki Yamakawa (3 outside)