Pressure packing comprised of packing rings secured against rotation with injection-molded segments
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United States of America Patent
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app pub date -
Sep 15, 2009
filing date -
Sep 25, 2008
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Abstract
Conventional anti-rotation devices comprised of packing rings in a packing container of a pressure packing consist of an anti-rotation pin inserted in a packing ring and engaging in a recess at an adjacent packing ring. Due to the different wear rates of the packing rings such anti-rotation pins are subject to shear stress that increases with wear and that can cause the anti-rotation pin to break. Injection-molded packing ring segments with molded anti-rotation nibs in turn require great material thickness for the anti-rotation nibs to be able to withstand the occurring stresses. To solve this problem, the invention suggests to mold a radial anti-rotation groove 24 at a radially cut packing ring segment 21 at one end, and to mold an anti-rotation nib 26 at an injection-molded tangentially cut packing ring segment 20, said anti-rotation nib engaging in the radial anti-rotation groove 24.
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