Rotary expansible chamber devices – With signal – indicator or transparent inspection means
Patent
1994-06-30
1995-11-14
Vrablik, John J.
Rotary expansible chamber devices
With signal, indicator or transparent inspection means
418 45, 418 50, 418 51, 417474, F04C 500, F04C 1500
Patent
active
054661331
ABSTRACT:
A peristaltic pump having a shaft mounted within a housing and coupled with a rotor to induce nutation in a wobble plate. A pump diaphragm is located and affixed to one side of the wobble plate and at its periphery to the housing. A backup diaphragm is employed on the other side of the wobble plate and provides a resilient coupling through a driven plate with the rotor. A spherical mount supports the wobble plate and is spring biased such that the mount and the resilient coupling provide a resilient mounting for the nutating wobble plate. A pump casing associated with the diaphragm defines a pump cavity with the pump diaphragm. An inlet and an outlet having ball check valves or flapper valves control flow. The pump diaphragm includes a ridge selectively positioned at the intersection with the diaphragm frame plate and with the wobble plate to increase resistance to liquid pressures on the diaphragm. Cavities are oriented and sized on one surface of the diaphragm to prevent buckling and excessive stress at specific diaphragm points. A flexible insert in the pump diaphragm is employed to couple with the wobble plate. A boss associated with the diaphragm and a cavity associated with the wobble plate help to further strengthen the diaphragm at the insert.
REFERENCES:
patent: 2636444 (1953-04-01), Salgues
patent: 3194167 (1965-07-01), Wilson
patent: 3922119 (1975-11-01), Rosenquist
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