Measuring and testing – Volume or rate of flow – Thermal type
Patent
1986-09-30
1988-12-13
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
731182, 732025, 7320427, G01F 168, G01M 1500
Patent
active
047901829
ABSTRACT:
A platinum wire (2) is wound in the form of coil. An outer surface of the coiled wire (2) is overcoated with a glass member (4). The coiled wire (2) is welded to supporting member (3). An exothermic resistor (1; 1A, 1B) comprised the coiled wire (12), the glass member (4) and the supporting member (3), and has no bobbin therein. Such an exothermic resistor (1; 1A, 1B) free from a bobbin is used as a hot wire element (1A) and a cold wire element (1B) in a hot wire air flow meter. The quantity of heat generated on the coiled wire (2) hardly transmit through the supporting member (3) and is carried away almost through air. The transient response characteristics under sudden change of an amount of air flow can be improved.
REFERENCES:
patent: 971101 (1910-09-01), Van Aller
patent: 2269850 (1942-01-01), Hebler
patent: 2287460 (1942-06-01), Wagenhals et al.
patent: 2319516 (1943-05-01), Phelps
patent: 2624199 (1953-01-01), Boyer
patent: 3246515 (1966-04-01), Martino et al.
patent: 3435676 (1969-04-01), Bruckner et al.
patent: 3824966 (1974-07-01), Schneider et al.
patent: 4369656 (1983-01-01), Ueno et al.
patent: 4400974 (1983-08-01), Nishimura et al.
Kooriyama Tsutomu
Suzuki Tadao
Takada Masumi
Takahashi Minoru
Tokuda Hiroatsu
Goldstein Herbert
Hitachi , Ltd.
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