Flow meter with piezo-ceramic resistance element

Details Flow meter with piezo-ceramic resistance element Flow meter with piezo-ceramic resistance element

1977-03-28

1978-07-18

Myracle, Jerry W.

Measuring and testing

Volume or rate of flow

System

310330, 310369, G01F 136

Patent

active

041007980

ABSTRACT:
A flow meter particularly for receiving respiratory flows for pulmonary function diagnoses has a perforated piezo-ceramic flow resistance element and transducer in a flow tube for providing a highly-sensitive flow measurement with little resistance to the flow. Electric contact plates abut opposite planar faces of the piezo-ceramic material plate and are spaced apart at the periphery of the piezo-ceramic plate by an insulating disk. Frame members carry the piezo-ceramic plate and electric contact plates and are spaced and protected within a housing of the flow meter by soft, floating seal members. Contact lugs connected to the electric contact plates conduct signals from the meter which are a function of the bending of the piezo-ceramic material plate under the differential flow pressures on an upstream and a downstream side of the piezo-ceramic plate.

REFERENCES:
patent: 2687147 (1954-08-01), Feichter
patent: 3504542 (1970-04-01), Blevins
patent: 3561831 (1971-02-01), Alibert et al.

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