Patent ID: 8579618

Claim:
An internal gear pump ( 1 ) for conveying fluid, the internal gear pump comprising: an enclosure ( 2 ); a driven pump gear wheel ( 3 ) and a ring gear ( 4 ) being located within the enclosure ( 2 ); the driven pump gear wheel ( 3 ) and the ring gear ( 4 ) at least partially meshing with one another; a sickle shaped element ( 5 ) being located within a free space of the enclosure for creating a sealing area, and the sickle shaped element ( 5 ) being immovably and fixedly secured to the enclosure ( 2 ); a first end piece ( 12 ) of the sickle shaped element ( 5 ) being located in a low pressure area of the gear pump ( 1 ); a second end piece ( 13 ) of the sickle shaped element ( 5 ) being located in a high pressure area of the gear pump ( 1 ); the first and the second end pieces ( 12 , 13 ) of the sickle shaped element ( 5 ) having different shapes from one another and being designed for avoiding cavitation and minimizing generation of noise during operation of the internal gear pump ( 1 ); tips of the driven pump gear wheel ( 3 ) define a circumference of the driven pump gear wheel ( 3 ); and an inner circumference of the first end piece ( 12 ) of the sickle shaped element ( 5 ) being spaced from the tips of the driven pump gear wheel ( 3 ) and extending tangentially with the circumference of the driven pump gear wheel ( 3 ) so as to form a tangential inlet area ( 6 ) which enhances a filling process of the driven pump gear wheel ( 3 ) and minimizing turbulence.