Volumetric dosing pump and dosing system comprising at least one of such pumps

Abstract

A volumetric dosing pump (10) is described, for delivering and dosing powdery, liquid, pasty or creamy products, comprising a first duct (5) for entering the product to be dosed, a second duct (9) for exiting such dosed product, an internal recess (12) connected to the first duct (5) for entering the product to be dosed and at least one pumping element with progressive recesses (7), which doses such product, operatively connected to motor means and fluid connected to the internal recess (12) and to the second duct (9) for exiting such dosed product, the pumping element with progressive recesses (7) comprising an external stator case (14) and an internal rotor (15) driven in rotation by the motor means, the internal rotor (15) being shaped as a worm screw with progressive recesses and the stator comprising an internal surface (16) in contact with the rotor (15) and shaped as worm screw.

1 . Volumetric dosing pump ( 10 ) for delivering and dosing powdery, liquid, pasty or creamy products, comprising a first duct ( 5 ) for entering the product to be dosed, a second duct ( 9 ) for exiting such dosed product, an internal recess ( 12 ) connected to the first duct ( 5 ) for entering the product to be dosed and at least one pumping element with progressive recesses ( 7 ), which doses such product, operatively connected to motor means and fluid connected to the internal recess ( 12 ) and to the second duct ( 9 ) for exiting such dosed product, said pumping element with progressive recesses ( 7 ) comprising an external stator case ( 14 ) and an internal rotor ( 15 ) driven in rotation by the motor means, said internal rotor ( 15 ) being shaped as a worm screw with progressive recesses and said stator comprising an internal surface ( 16 ) in contact with the rotor ( 15 ) and being shaped as worm screw, said internal surface ( 16 ) being coated with a coating layer ( 18 ) made of a different material with respect to the material of which the stator ( 14 ) is made, characterized in that the stator ( 14 ) and the coating layer ( 18 ) are made through injection co-moulding of the stator ( 14 ) and of the coating layer ( 18 ), the stator ( 14 ) being made of rubber, the coating layer ( 18 ) being made of polymeric plastic and/or thermoplastic material, namely polyethylene. 
     
     
         2 . Volumetric dosing pump ( 10 ) according to  claim 1 , characterized in that the stator ( 14 ) is made of thermoplastic rubber. 
     
     
         3 . Dosing/delivering system comprising at least one managing and actuating device, such managing and actuating device comprising motor means and at least one volumetric dosing pump ( 10 ) according to any one of the previous claims, operatively connected to such motor means.