Pumps – With signal – indicator – or inspection means
Patent
1986-02-11
1988-04-26
Croyle, Carlton R.
Pumps
With signal, indicator, or inspection means
417395, 92 5R, 116206, 340605, F04B 2100, F04B 4306, G01D 2100
Patent
active
047401397
ABSTRACT:
In accordance with the present invention, a diaphragm pump having a housing, a first chamber within said housing, a second chamber within said housing and a pair of diaphragm elements mounted in said housing between said first chamber and said second chamber, is provided with a failure sensing system for the diaphragm. The failure sensing system including a failure sensing device which is between the two parts of the diaphragm and an indicator circuit which includes the conductive liquid which is being pumped and an alarm. The two parts of the diaphragm element are clamped together proximate their peripheral edge such that a circumferential fluid tight compression seal region is provided. The sensing device includes an electrically conductive lead which extends from the exterior of the housing, through the circumferential fluid tight seal region into the region peripherally inward of the seal region. The electrically conductive material is, advantageously, an electrically conductive graphite and in the form of a filament, fibers or strands. Thus, when a failure of the diaphragm occurs, conductive liquid comes into electrical contact with said lead and completes a circuit to sound an alarm thereby indicating the failure of said diaphragm.
REFERENCES:
patent: 2323950 (1943-07-01), Wade
patent: 2662478 (1953-12-01), Surre
patent: 2708896 (1955-05-01), Smith et al.
patent: 3131638 (1964-05-01), Wilson et al.
patent: 3661060 (1972-05-01), Bowen
patent: 3731685 (1973-05-01), Eidus
Croyle Carlton R.
Neils Paul F.
Parker Sheldon H.
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