초록 ▼

An improved isolation diaphragm assembly for use in pressure transducers includes an open plenum containing an inert transmission fluid such as silicone oil. The plenum opening is bridged by a corrugated, circular diaphragm which has been tack welded at spaced locations on its periphery and then def

An improved isolation diaphragm assembly for use in pressure transducers includes an open plenum containing an inert transmission fluid such as silicone oil. The plenum opening is bridged by a corrugated, circular diaphragm which has been tack welded at spaced locations on its periphery and then deformed into an underlying circular groove in the transducer housing, thereby providing a smooth sealing surface between the tack welds and the deformed portion. A domed cover having an O-ring seal contacting the smooth sealing surface is attached to the transducer housing so that a fluid whose pressure is to be measured may be introduced on the other side of the diaphragm from the inert transmission fluid. A method of manufacture is also disclosed.

대표청구항 ▼

In a pressure transducer of the type comprising: a hollow transducer housing, a pressure transmitting liquid within said housing, a flexible isolation element secured to said housing with one side thereof in pressure transmitting relation to said pressure transmitting liquid and a cover secured to s

In a pressure transducer of the type comprising: a hollow transducer housing, a pressure transmitting liquid within said housing, a flexible isolation element secured to said housing with one side thereof in pressure transmitting relation to said pressure transmitting liquid and a cover secured to said housing for admitting a test fluid to the other side of said flexible isolation element, the improvement comprising: a peripheral flange on said flexible isolation element; a first annular sealing surface on said housing, said sealing surface having at least one annular groove formed therein and being sized to accommodate at least said peripheral flange; a plurality of spaced tack welds securing said peripheral flange to said annular sealing surface; means formed in said peripheral flange subsequent to said plurality of spaced tack welds for extending into said annular groove to provide a second annular sealing surface on said peripheral flange between said spaced tack welds and said annular groove, thereby to prevent radial movement of said flexible isolation diaphragm and to minimize leakage of said pressure transmitting fluid; and seal means located in said cover for contacting said peripheral flange on said second annular sealing surface.