Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1986-11-25
1990-05-22
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310344, H01L 4108
Patent
active
049280317
ABSTRACT:
The present invention is directed to a device which simply and efficiently compensates for changes in the volume of a fluid trapped in a fluid-filled cavity between two relatively immovable housings and an elastomeric seal ring. The present invention is particularly useful in an acoustic transducer pad assembly designed for installation on logging tools used in deep boreholes in the oil and gas industry where high temperatures and pressures are experienced at downhole locations. In a presently preferred embodiment, the device comprises a transducer unit housing fixedly secured to a metal wear pad housing with an elastomeric seal disposed therebetween to define a fluid-filled cavity between adjacent portions of the housings and the seal. The seal is disposed in a groove of sufficient size to permit the required lateral expansion and contraction by deformation or extrusion of the seal in order to compensate for the expected changes in the volume of the fluid-filled cavity.
REFERENCES:
patent: 3123784 (1964-03-01), Ritz
patent: 3243496 (1966-03-01), Silverstein
patent: 4092484 (1978-05-01), Majkrzak et al.
patent: 4331830 (1982-05-01), Conway et al.
Linyaev Eugene J.
Swanson, Jr. Roy E.
Budd Mark O.
Western Atlas International Inc.
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