Fluid flow indicator and flow switch

Details Fluid flow indicator and flow switch Fluid flow indicator and flow switch

1976-07-29

1978-07-18

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

73231R, 116117C, 340608, G08B 2100, G01F 106

Patent

active

041018745

ABSTRACT:
A small diameter transparent visible fluid flow indicator suitable for mounting behind an opening in an instrument panel contains a six-bladed paddle wheel pivoted for rotation by the flow of fluid passing through orifices in the indicator housing. Each of the six blades of the wheel contains a small magnet oppositely polarized from the magnets in the adjacent blades to create alternate magnetic fields that pass through a pickup coil embedded in the housing. The resulting coil voltage is amplified and rectified to control a relay switch. Thus, the liquid flow indicator provides both a visible indication of fluid flow and also controls a switching circuit that may be used as an alarm if the fluid flow stops or varies from some predetermined value.

REFERENCES:
patent: 2097535 (1937-11-01), Rugel et al.
patent: 2687457 (1954-08-01), Smith
patent: 3093973 (1963-06-01), Williams
patent: 3533285 (1970-10-01), Dee
patent: 3636767 (1972-01-01), Duffy
patent: 3641819 (1972-02-01), Kendrick
patent: 3783248 (1974-01-01), Sugden, Jr.
patent: 3866469 (1975-02-01), Wemyss
patent: 3978462 (1976-08-01), Goodman

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