Magnetically-coupled pump
AssigneeMarch Manufacturing Company
InventorFrederick N. Zimmermann
Life of this patent
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Abstract
A magnetically-coupled centrifugal type of pump characterized in that the pump housing comprises two members which can be made by molding, for example in plastic, and one of the body members has formed as integral parts thereof two reversely opening magnet wells, one for the inner driven coupling magnet and the other for the outer driving magnet; and the shaft mounting the impeller is footed on either member as an integral part of such member. Supplements to the subject: (1) the shaft may be separable and if so, has a sealing ring seated in a groove in the wall on which it is mounted or in the juxtaposed foot of the spindle; and (2) if the shaft is formed integrally, it may include a long metallic internal warp-preventing member.
Claims13
In a centrifugal pump of the magnetically-coupled type including a pump housing with inlet and outlet passages for an impeller having a coupling magnet rotatable therewith and adapted to be driven by an annular circumambient driving magnet disposed exteriorly of the housing, a housing structure adapted for fabrication by molding from either metallic or non-metallic moldable materials and comprising first and second body members joinable to form a closed pump housing including an impeller chamber and a magnet well opening only into said chamber and extending away therefrom in axial alignment with the axis of rotation of the impeller;
- impeller means having a hub portion adapted to be disposed in said well and impeller formations adapted to rotate in said chamber;
- a driven magnet affixed to said hub portion and rotatable therewith in the well;
- shaft means for the impeller means and comprising an integral projection of the material of one of said body members extending from a point of conjunction therewith a substantial distance into said impeller chamber and magnet well to support the impeller means for rotation as aforesaid.
In a magnetically coupled pump of the type employing an impeller with a cylindrical driven magnet coaxially attached to a hub region thereof and adapted to be rotated by an annular driving magnet rotating circumambiently of the driven magnet, improvements comprising:
- a pump housing having inlet and outlet ports and formed of molded plastic material to include first and second body members, one of which has configurations defining an impeller chamber from which projects a cylindrical magnet well into which said driven magnet fits closely but freely for rotation with the impeller operatively disposed to rotate concentrically therewith in said impeller chamber, the other one of said body members constituting a closure for said chamber;
- and shaft means supporting said impeller and attached driven magnet for rotation as aforesaid and comprising a shaft element integrally conformed and footed at one end with one of said body members to project a substantial distance concentrically into said well, said well projecting concentrically with the impeller axis into space from said housing in a manner such that the driving magnet can rotate closely concentrically thereabout in coupling coaction with the driven magnet inside the well.
In a centrifugal pump of the type including a housing having an impeller rotated therein by concentrically rotatable annular magnets one of which is attached to the impeller inside of the housing with the other magnet motor-rotated in circumambient coupling relation thereabout externally of the housing, the improvements which comprise:
- an impeller structure and included driven magnet particularly adapted for pumping caustics, acids and like chemically active fluids and comprising a unitary rigid body of molded plastic material of a type resistant to such fluids, said body including a cylindrical hub portion having impelling configurations integrally conformed therewith and located in relation to the axial ends thereof so as to leave exposed a substantial circumferential area of the outer cylindrical periphery thereof exposed for rotation in close proximity to a circumscribing enclosing wall portion of said housing, together with a cylindrical driven magnet embedded and sealed wholly within said structure with a substantial circumferential area of the outer cylindrical aspect thereof concentrically close to the peripheral margins of said exposed circumferential area of the hub whereby to permit close magnetic-coupling contiguity to the circumambiently rotated driving magnet.
Dependencies are inferred from the claim text.