| 摘要 |
The present invention provides a diaphragm for use in pump applications in which at least a predetermined portion of such diaphragm is in contact with such outer piston which would tend to abrade such diaphragm. Such diaphragm is formed from at least one layer of a preselected flexible material. Such diaphragm comprises an outer bead like portion for securing the diaphragm to a pump housing. There is a annular flexure portion having a first end and a second end, such first end and such second end being generally flat and an arcuate shaped middle portion formed contiguously with the first end and the second end. Such first end is formed contiguously with the outer bead like portion. Such annular flexure portion, has a substantially uniform first predetermined thickness. An enlarged bulbous portion is formed contiguously with the second end and extends around an inner periphery thereof. Such enlarged bulbous portion has a predetermined configuration. Such diaphragm has an enlarged section formed as a protrusion that extends outwardly from an outer surface of the generally flat second end. Such enlarged section is formed contiguously with the enlarged bulbous portion and extends around an outer periphery thereof. The enlarged section causes the second end to be thicker than such first predetermined thickness. Further, there is a generally flat center portion that is formed contiguously with the enlarged bulbous portion and extends around an inner periphery thereof.
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