Piston type metering pump
AssigneeAskoll S.p.A.
InventorElio Marioni
Life of this patent
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Abstract
The piston type metering pump includes a synchronous electric motor, for example of the permanent-magnet type, which transmits its rotary motion to a speed reducer which is in turn associated, by means of a connecting rod-crank kinematic system, to a piston which is slidable in a hollow body in which it defines a variable-volume chamber. The chamber has, at its top, openings on which fluid intake and discharge valve means act.
Claims20
Piston type metering pump, comprising a synchronous electric motor which is suitable for transmitting rotary motion to speed reduction means which are associated, by virtue of means suitable for converting rotary motion into reciprocating motion, with a piston element which is slidable in a hollow body in which it defines a variable-volume chamber which is associated with valve means for the intake and discharge of fluid, said speed reduction means being constituted by a worm screw which is associated with a gearwheel which meshes therewith, said gearwheel having two axial rotation pivots which are rotatably associated with walls which extend inside a housing which is fixed to said body, said means suitable for converting the rotary motion into reciprocating motion being constituted by an eccentric tab which extends from one of said pivots of said gearwheel and by a connecting rod which is rotatably associated, with one end, with an articulation pivot which is monolithic with said eccentric tab.
Piston type metering pump, comprising a synchronous electric motor which is suitable for transmitting rotary motion to speed reduction means which are associated, by virtue of means suitable for converting rotary motion into reciprocating motion, with a piston element which is slidable in a hollow body in which it defines a variable-volume chamber which is associated with valve means for the intake and discharge of fluid, said body defining a first chamber and a second chamber, said electric motor comprising a stator arranged in said first chamber and a rotor arranged in said second chamber, said speed reduction means being constituted by a worm screw which is associated with a gearwheel which meshes therewith, said worm screw being rigidly associated with a shaft which freely supports said rotor of said motor, said shaft furthermore having its ends freely inserted in respective seats, a first one of said seats extending axially from said second chamber of said body, a second one extending inside a housing which is fixed to said body.
Piston type metering pump, comprising a synchronous electric motor which is suitable for transmitting rotary motion to speed reduction means which are associated, by virtue of means suitable for converting rotary motion into reciprocating motion, with a piston element which is slidable in a hollow body in which it defines a variable-volume chamber which is associated with valve means for the intake and discharge of fluid, said synchronous electric motor being of the type with permanent magnets having a stator pack which is embedded in resin in a first chamber of a body of said pump, said motor having a rotor which is accommodated in a second chamber of said body which has an open end, said hollow body being monolithic with said motor body and being shaped complimentarily to the outer curved surface of said piston, said hollow body having, at a head of said variable-volume chamber, an expansion in which an intermediate closure element of said head and a cover which is externally provided with a hydraulic sealing ring are inserted, said cover being associated with said hollow body with snap-together couplings, said rotor of said motor being coupled with said speed reduction means by means of elastic spring means, said speed reduction means comprising a gearwheel which is axially associated with a plain bearing which is accommodated in a corresponding support of the pump body, said valve means being enclosed between two hollow elements which are accommodated in a seat of said head and being associated with a single sealing element which is suitable for preventing the internal recirculation and escape of liquid.
Dependencies are inferred from the claim text.