Pump box with replaceable erosion protector

F - Mech Eng,Light,Heat,Weapons – 04 – D

Patent

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Details

F04D 29/12 (2006.01) F16J 15/34 (2006.01)

Patent

CA 2230441

A mechanical seal is disposed in surrounding relationship to a pump shaft (14) within an enlarged-bore seal chamber (16) defined by the pump housing (11) to create a sealed relationship therebetween. The mechanical seal includes a gland ring (25) stationarily fixed to the pump housing (11) for closing off an outer end of the enlarged-bore seal chamber (16). An annular erosion protector (41) is disposed within the enlarged-bore chamber in close and generally overlapping relationship to the inner axial face of the gland ring (25). This annular protector (41) has radially projecting protrusions (66) which project axially inwardly along the outer portion of the enlarged-bore chamber (16), and also preferably has an annular part (61) which projects radially inwardly so as to effectively cover substantially the entire inner face of the gland ring (25). The erosion protector (41) is effective in significantly eliminating direct erosion-contact of pump fluid against both the gland ring (25) and the surrounding wall (17) of the seal chamber (16).

Une garniture mécanique d'étanchéité est placée autour d'un arbre de pompe (14) à l'intérieur d'une boîte d'étanchéité à alésage élargi (16) définie par le carter de la pompe (11) de façon telle que l'étanchéité est maintenue entre les deux. La garniture mécanique d'étanchéité comporte une bague d'étanchéité (25) fixée de façon stationnaire sur le carter de la pompe (11) et fermant une extrémité extérieure de la boîte d'étanchéité à alésage élargi (16). Une protection anti-érosion annulaire (41) est placée à l'intérieur de la boîte à alésage élargie à proximité de la face axiale intérieure de la bague d'étanchéité (25) et recouvrant partiellement celle-ci. Cette protection annulaire (41) comporte des saillies radiales (66) qui s'étendent axialement vers l'intérieur le long de la partie extérieure de la boîte à alésage élargi (16), et de préférence une partie annulaire (61) faisant saillie radialement vers l'intérieur de façon à couvrir sensiblement la totalité de la face intérieure de la bague d'étanchéité (25). Cette protection anti-érosion (41) est efficace pour éliminer notablement le contact direct érodant du fluide pompé tant contre la bague d'étanchéité (25) que contre la paroi (17) entourant la boîte d'étanchéité (16).

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