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.

Claims

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.

Description

[0012] The present invention will be better described by some preferred embodiments thereof, provided as a non-limiting example, with reference to the enclosed drawings, in which:

[0013] FIG. 1 shows a side sectional view of a volumetric dosing pump according to the present invention; and

[0014] FIG. 2 shows a side sectional view of a part of a volumetric dosing pump according to the present invention.

[0015] With reference to the Figures, the volumetric dosing pump 10 according to the present invention, in particular for delivering and dosing powdery, liquid, pasty or creamy products, comprises 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, composed for example of an electric driving motor (not shown in the Figures), and fluid connected to the internal recess 12 and to the second duct 9 for exiting such dosed product.

[0016] Preferably, the pumping element with progressive recesses 7 comprises an external stator case 14 and an internal rotor 15 driven in rotation by the motor means, such internal rotor 15 being shaped as a worm screw with progressive recesses whose relative rotation with respect to the stator 14 causes a translation movement of the product therein. When the pump 10 with progressive recesses is actuated by the motor means, during the rotation movement of its internal rotor 15, it transfers certain amounts of product from the first duct 5 for sucking such product to be dosed to the second exit duct 9.

[0017] The stator further comprises an internal surface 16 in contact with the rotor 15 which, similarly thereto, is shaped as a worm screw or a coil, 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.

[0018] Preferably, the stator 14 is made of rubber, for example thermoplastic rubber, through moulding, and the coating layer 18 is made of polymeric plastic and/or thermoplastic material, for example polyethylene.

[0019] In a preferred way, the stator 14 and the coating layer 18 are made through injection co-moulding of the stator 14 and of the coating layer 18; preferably, the stator 14 and the coating layer 18 are made through co-moulding of rubber and of a layer of polymeric plastic and/or thermoplastic material, for example polyethylene.

[0020] Advantageously, the coating layer 18 made of polymeric plastic and/or thermoplastic material, for example polyethylene, allows using the pump with materials containing the most used solvents, without damaging the surface of the stator 14 and with a reduced cost.

[0021] A dosing/delivering system according to the present invention comprises at least one managing and actuating device, such managing and actuating device comprising motor means, and at least one dosing pump 10 as previously described, operatively connected to such motor means, for example by interposing at least one related rotating shaft.

[0022] Advantageously, the system according to the present invention can further comprise means for supplying and/or storing the product to be dosed and delivered by the dosing pump 10, fluid connected to the first suction duct 5.