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US 5,152,663 AGranted
Centrifugal pump
AssigneeA. Ahlstrom Corporation
InventorsTapio Peroaho, Reijo Vesala, Vesa Vikman
Life of this patent
Estimating the term…
Abstract
A centrifugal pump for pumping fiber suspensions including a centrifugal pump housing (50) defining a centrifugal pump chamber (54) having a suspension inlet and suspension outlet. Located within the pumping chamber is a centrifugal impeller (60). A vacuum pump chamber (76) defined by a front wall (112) facing the impeller and a rear wall (110) and opposite the front wall is located adjacent the centrifugal pumping chamber (54). A vacuum pump rotor (96) is mounted within the vacuum pump chamber at a distance from the front and the rear walls (112, 110). The axial distance between the vacuum pump rotor and the front and rear walls (112, 110) is adjustable to a value of less than 0.30 mm, and preferably less than about 0.20 mm.
Claims17
A centrifugal pump comprising:
- a centrifugal pump housing (50) defining a centrifugal pumping chamber (54) having an inlet (52) and an outlet;
- a centrifugal impeller (60) within said pumping chamber;
- a vacuum pump chamber (76) defined by a front wall (112) facing said impeller and a rear wall (110) in spaced relation and opposite said front wall, said chamber having a gas inlet and a gas outlet;
- a rotor (96) within said vacuum pump chamber and spaced by a distance from said front and rear walls (112, 110);
- an intermediate wall (72) separating said vacuum pump chamber (76) from said centrifugal pump chamber (54);
- a rotary shaft (58) extending through said vacuum pump chamber (76) and said intermediate wall (72) into said centrifugal pumping chamber (54);
- said centrifugal pump impeller (60) and said vacuum pump rotor (96) being mounted on said shaft;
- and
- means operatively connected to one of said walls (112, 110) for moving at least one of said front and rear wall (112, 110) for axially adjusting said distance between said vacuum pump rotor (96) and at least one of said front and rear wall (112, 110).
6 more elements
A centrifugal pump comprising:
- a centrifugal pump housing (50) defining a centrifugal pumping chamber (54) having an inlet (52) and an outlet;
- a centrifugal impeller (60) within said pumping chamber;
- a vacuum pump chamber (76) defined by a front wall (112) facing said impeller and a rear wall (110) in spaced relation and opposite said front wall, said chamber having a gas inlet;
- a rotor (96) within said vacuum pump chamber and spaced by a distance from said front and rear walls (112, 110);
- an intermediate wall (72) separating said vacuum pump chamber (76) from said centrifugal pump chamber (54);
- a rotary shaft (58) extending through said vacuum pump chamber (76) and said intermediate wall (72) into said centrifugal pumping chamber (54);
- said centrifugal pump impeller (60) and said vacuum pump rotor (96) being mounted on said shaft;
- and
- means for axially adjusting said distance between said vacuum pump rotor (96) and at least one of said front and rear wall (112, 110);
- said vacuum pump chamber (76) having a pressure side and a suction side and additionally comprising a gas discharge opening (80) at said pressure side of said chamber (76) and a make-up air inlet duct (84) extending into said chamber (76) through said rear wall opposite said intermediate wall (72).
7 more elements
A centrifugal pump comprising:
- a centrifugal pump housing (50) defining a centrifugal pumping chamber (54) having an inlet (52) and an outlet;
- a centrifugal impeller (60) within said pumping chamber;
- a vacuum pump chamber (76) defined by a front wall (112) facing said impeller and a rear wall (110) in spaced relation and opposite said front wall, said chamber having a gas inlet and a gas outlet;
- a rotor (96) within said vacuum pump chamber and spaced by a distance from said front and rear walls (112, 110);
- an intermediate wall (72) separating said vacuum pump chamber (76) from said centrifugal pump chamber (54);
- a rotary shaft (58) extending through said vacuum pump chamber (76) and said intermediate wall (72) into said centrifugal pumping chamber (54);
- said centrifugal pump impeller (60) and said vacuum pump rotor (96) being mounted on said shaft;
- means for moving at least one of said front and rear wall (112, 110);
- and
- a pump frame (56) attached to said housing (50);
- said vacuum pump rotor (96) being fixedly mounted to said shaft (58) within said vacuum pump chamber (76);
- and said adjustment means for the axial adjustment comprising a shaft bearing unit (51) disposed circumjacent said shaft and slidably mounted on said frame (56);
- said shaft being mounted within said frame (56) and said bearing unit (51) so that upon sliding movement of said bearing unit the position of said rotor is axially adjusted relative to said front and rear walls (112, 110) of said vacuum pump (70) by movement of said shaft (58);
- said adjustment means additionally comprising a support member (59) fixedly secured to said bearing unit (51);
- lock means (73) for fixedly mounting said shaft to said bearing unit (51);
- said support member (59) having a plurality of threaded holes therein and said frame (56) having a plurality of non-threaded holes therein in alignment with said threaded holes in said support member;
- a plurality of bolts (57) extending through said threaded holes into said non-threaded holes so that upon movement of said bolts said support member together with said shaft will move in a first direction;
- said support member further having a plurality of non-threaded holes therein and said pump frame (56) having a plurality of threaded holes therein in alignment with said non-threaded holes in said support member;
- a plurality of second bolts (77) extending through said non-threaded holes of said support member into said threaded holes of said frame so that, upon rotation of said bolts, said support member and said shaft will move in a second direction.
16 more elements
Dependencies are inferred from the claim text.