Centrifugal pumps
AssigneeSociete Internationale de Mecanique Industrielle S.A.
InventorJean Menager
Life of this patent
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Abstract
A centrifugal pump, of the type comprising a body, a shaft rotatable in the body via a bearing, an impeller fixed on the shaft and, between the impeller and the bearing, a mechanical seal assembly comprising a pair of engaging slide rings and an inner sleeve made of elastomeric material, fitted on the shaft, the said sleeve comprising a portion adjacent the impeller on which is fixed one of the slide rings and, at the end on the bearing side, a radial flare for holding the seal assembly in the assembled state prior to its mounting, said sleeve being extended axially, beyond said radial flare, by a lip member arranged to rub on the adjacent surface of the bearing.
Claims9
A centrifugal pump, of the type comprising a body, a shaft rotatably mounted in the body via a bearing, an impeller fixed on the shaft and, between the impeller and the bearing, a mechanical seal assembly comprising a pair of engaging slide rings and an inner sleeve made of elastomeric material fitted on the shaft, said sleeve comprising a portion at the end adjacent the impeller on which is fixed one of the slide rings and, at the other end adjacent the bearing, a radial flare for holding the seal assembly in the assembled state prior to its mounting and after mounting functioning as a flinger to radially throw off any liquid on its surface during operation of the pump, an axial extension on said sleeve between said radial flare and said bearing, a seal member at the bearing end of said axial extension comprising a lip member integral with said sleeve and having an axially facing portion which in use sealingly engages a part of said bearing to prevent bearing lubricant from leaking into said seal assembly, and a radially extending opening through said pump body substantially aligned with said radial flare.
A seal assembly for a centrifugal pump, comprising a sleeve of elastomeric material, a counter-ring tightened on an end portion of the sleeve, a slide ring in contact with the counter-ring, a resilient bellows one end of which supports the slide ring and the other end of which is fixed to a casing comprising a tubular part, a spring biasing the slide ring into engagement with the counter-ring, the sleeve having at its other end a radial flare which functions as a stop for the casing to hold the seal assembly in the assembled state when not in use and when rotating in use functions as a flinger to radially throw off any liquid on its surface during operation of the pump, an axial extension integral with said sleeve and extending beyond said radial flare, a seal member at the outer end of said axial extension comprising a circular lip member integral with said axial extension and having an axially facing portion which in use functions as a seal when engaging a bearing part to prevent bearing lubricant from leaking into said seal assembly.
Dependencies are inferred from the claim text.