A seal for a pump, and a pump comprising the seal

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

Patent

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Details

F04D 7/04 (2006.01) F04D 29/04 (2006.01) F04D 29/12 (2006.01) F16J 15/18 (2006.01)

Patent

CA 2282389

A pump (1) for pumping a slurry comprises a pump housing (2) defining a pumping chamber (5) with an impeller (6) located therein for pumping the slurry from an axial inlet port (7) to a radial outlet port (8). The impeller (6) is carried on a pump shaft (10) which is in turn rotatably carried in a shaft carrier sleeve (18) in a carrier housing (12) which also carries the pump housing (2). The shaft carrier sleeve (18) and the pump shaft (10) are axially adjustable in the direction of the arrows A and B for adjusting an axial clearance gap (25) between the impeller (6) and the pump housing (2). A shaft seal (9) for sealing the pumping chamber (5) comprises a packed gland seal (42) and a rotating sealing ring (38) and a stationary sealing ring (39). A lubricating fluid cavity (40) is located between the packed gland seal (42) and the rotating and stationary sealing rings (38, 39) for lubricating axially facing rotating and stationary sealing surfaces (52, 58). The stationary sealing ring (39) is engageable with a shoulder (61) on the pump shaft (10) for urging the stationary sealing ring (39) along with the pump shaft (10) as the axial clearance gap (25) is being closed so that when the axial clearance gap (25) is being opened to the desired clearance width (x) the rotating and stationary sealing surfaces (52, 58) are brought into sealing engagement with each other.

Cette pompe (1) destinée à pomper une matière boueuse comprend un logement (2) délimitant une chambre de pompage (5) dans laquelle on a placé une roue hélice (6) servant à pomper la matière boueuse à partir d'un orifice d'entrée axial (7) pour la diriger vers un orifice de sortie radial (8). La roue hélice (6) est portée par un arbre (10) de pompe, lequel est à son tour porté de manière rotative dans un manchon porteur (18) placé dans une gaine porteuse (12) portant également le logement (2) de la pompe. Le manchon (18) et l'arbre (10) sont réglables axialement dans le sens des flèches A et B, aux fins de réglage d'un intervalle axial (25) entre la roue hélice (6) et le logement (2) de la pompe. Une garniture d'étanchéité d'arbre (9), destinée à étanchéifier la chambre de pompage (5) comprend un joint presse-étoupe serré (42) ainsi qu'une bague d'étanchéité rotative (38) et une bague d'étanchéité fixe (39). Une cavité (40) à fluide lubrifiant est située entre le joint presse-étoupe (42) et les bagues d'étanchéité rotative et fixe (38, 39), afin de lubrifier axialement des surfaces (52, 58) d'étanchéité rotatives et fixes se faisant face. La bague d'étanchéité fixe (39) entre en contact avec un épaulement (61) de l'arbre (10) de la pompe, lequel pousse cette bague (39) en même temps que l'arbre (10) lors de la fermeture de l'intervalle axial (25) de façon que, lors de l'ouverture de cet intervalle (25) et jusqu'à l'obtention de la largeur désirée de celui-ci (x), les surfaces d'étanchéité (52, 58) soient mises l'une contre l'autre pour établir un contact d'étanchéité.

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