Pump and electric drive motor unit

Abstract

There is described a pump assembly which, in a unitary structure, comprises a pump proper and an electric pump drive motor, both contained in a common housing. A metal disc, forming part of the pump housing, is positioned at one end inside the common housing and supports a stationary shaft extending coaxially with and along the entire length of the pump assembly. On the stationary shaft journals the armature of the drive motor and the pump rotor member rotationally coupled to the armature.

That which is claimed is: 
     
       1. A pump-and-motor unit comprising, in combination: A. an .Iadd.elongated .Iaddend.external housing having an inlet opening .Iadd.at one end .Iaddend.and an outlet opening .Iadd.at the other end.Iaddend.;   B. a base body contained in said external housing and formed of 1. a metal disc secured .[.at one end.]. within said external housing .Iadd.adjacent one of said openings .Iaddend.and   2. a stationary shaft affixed to said metal disc and extending within said external housing .[.substantially along the entire length thereof.]. .Iadd.toward said other opening.Iaddend.;     C. an electrical motor including an armature .[.axially spaced from.]. .Iadd.located between .Iaddend.said metal disc .Iadd.and said other opening .Iaddend.and journaling on said stationary shaft and being exposed to the .[.flow of.]. liquid .[.medium through said pump-and-motor unit.]. .Iadd.flowing from said inlet opening to said outlet opening.Iaddend.;   D. a pump rotor member disposed within said external housing; and   E. means rotationally coupling said pump rotor member to said armature.   
     
     
       2. A pump-and-motor unit as defined in claim 1, including A. an intermediate plate in a face-to-face engagement with said metal disc,   B. a closure plate in a face-to-face engagement with said intermediate plate, and   C. a pump work chamber accommodating said pump rotor member and constituted by a throughgoing opening provided in said intermediate plate, said pump work chamber bounded at one axial end by said metal disc and bounded at the other axial end by said closure plate.   
     
     
       3. A pump-and-motor unit as defined in claim 2, wherein said metal disc is made of sintered steel and said intermediate plate, said closure plate and said pump rotor member are made of a metal. 
     
     
       4. A pump-and-motor unit as defined in claim 2, wherein said intermediate plate, said closure plate and said pump rotor member are made of steel. 
     
     
       5. A pump-and-motor unit as defined in claim 1, said armature including A. a collector ring disposed at one end of said armature,   B. at least one bearing sleeve surrounding said stationary shaft and slidably contacting the same, said bearing sleeve being disposed approximately along the mid portion of said armature with respect to the entire length thereof,   C. a stack of armature plates press-fitted on said bearing sleeve,   D. an armature coil surrounding said armature plates and   E. a coating of synthetic material forming the external, encompassing casing of said armature.   
     
     
       6. A pump-and-motor unit as defined in claim 1, said means rotationally coupling said pump rotor member to said armature being formed of a driving sleeve surrounding said stationary shaft and having driving means at both ends, said driving means being in rotationally coupling engagement with said armature and with said pump rotor member. 
     
     
       7. A pump-and-motor unit as defined in claim 6, wherein said driving means forming part of said driving sleeve includes two sets of projections arranged circumferentially at both axial end portions of said driving sleeve, one set of said projections engaging said pump rotor member, said last-named projections having an axial length substantially equal to that of said pump rotor member, the other set of said projections engaging complemental axial grooves formed in said armature, the axial length of said last-named projections being substantially equal to that of said axial grooves, the outer axial end of each projection being flush with the radial terminal face of the associated end portion of said driving sleeve. 
     
     
       8. A pump-and-motor unit as defined in claim 7, wherein each complemental axial groove formed in said armature contains a radially inwardly projecting elevated portion snapping behind the corresponding projection of the set associated with said armature for securing the latter against axial displacement with respect to said driving sleeve. 
     
     
       9. A pump-and-motor unit as defined in claim 1, including A. a support structure made of synthetic material and surrounding said armature in a tubular manner within said external housing, said support structure containing outwardly open recesses arranged circumferentially,   B. a plurality of permanent magnets forming part of said electric motor and disposed in said recesses and   C. a tubular sheet metal member made of a magnetically conductive material and surrounding support structure within said external housing.   
     
     
       10. A pump-and-motor unit as defined in claim 1, including an inlet nipple formed as an internal component of said external housing. 
     
     
       11. A pump-and-motor unit as defined in claim 1, including an outlet nipple containing a check valve. 
     
     
       12. A pump-and-motor unit as defined in claim 1, further including A. a throughgoing port provided in said metal disc, said port connecting the pressure side of said pump rotor member with the inlet of the pump-and-motor unit,   B. a flap valve, including a soft-elastic sealing body cooperating with said port,   C. a spring urging said flap valve into contact with said metal disc to close said port, and   D. a clamping ring secured to an end portion of said stationary shaft and serving as a support for said spring, said last-named end portion projecting beyond said metal disc in a direction away from said armature. .Iadd. 13. A pump-and-motor unit comprising, in combination:   A. an elongated housing having a liquid-admitting inlet end and an opposite liquid-discharging outlet end;   B. a shaft fixedly mounted in said housing;   C. a pump installed in said housing adjacent one of said ends and including a first rotor mounted on and rotatable relative to said shaft to thereby cause liquid to flow from said liquid-admitting inlet end to said liquid discharging-outlet end;   D. an electric motor installed in said housing between said pump and said other end and having a second rotor mounted on and rotatable relative to said shaft and being exposed to the liquid flowing from said liquid-admitting inlet end to said liquid-discharging outlet end; and   E. elastic torque-transmitting means connecting said rotors. .Iaddend.