Patent ID: 9732750
Date: 2017-08-15
CPC Classifications: F04B,F04C,F05C

Claim:
1. A plastic disposable metering pump ( 1 ) for products with solid components, the metering pump comprising two rotors ( 10 ) which are coupled to each other by gearwheels ( 11 ), are driven in opposite directions and are mounted in a pump housing ( 5 ) provided with a suction connection ( 6 ) and an outlet connection ( 7 ), wherein the rotors have respective rotor shafts ( 12 ), rotor shaft ends ( 15 ) of which are supported in walls ( 8 , 4 ) of the pump housing ( 5 ), and wherein each of the rotors ( 10 ) has two rotor blade walls ( 13 ), which are arranged diametrically on an associated rotor shaft ( 12 ) and onto peripheral ends of which are formed respective partially cylindrical rotor blade shoes ( 14 ), wherein the rotor blade shoes ( 14 ) bear slidingly and sealingly against cylindrical inner wall regions of the pump housing ( 5 ), and wherein, furthermore, the rotor blade walls ( 13 ) have between the rotor shafts ( 12 ) and the rotor blade shoes ( 14 ) on both sides concave recessed surfaces ( 24 ), wherein end edges of the rotor blade shoes ( 14 ) of one of the rotor blade shoes ( 14 ) engage along the recessed surfaces ( 24 ) of the other rotor blade shoe ( 14 ) during operation, and wherein at least one longitudinal scraping rib ( 28 ) protrudes radially outwardly from one of the rotor shafts ( 12 ), wherein the at least one longitudinal scraping rib ( 28 ) engages along the rotor blade shoes ( 14 ) during operation.