Patent ID: 6033183
Filing Date: 2000-03-07
Classification: B29C,B29L,F04D,F05C

Abstract:
An impeller for a rotary pump havingan annular upper part (1) defining a central inlet (4);a circular disk-shaped lower part (2) adjacent to a drive of said pump; anda plurality of blades (5) secured between said upper part (1) and said lower part (2),whereinsaid upper part (1) and said lower part (2) are separate parts, connectable with each other;some of said blades (5) are formed only on said upper part and remaining ones of said blades are formed only on said lower part;each of said blades (5) has a free edge (6) remote from a connection of said blade to said part (1, 2), said edge being formed with a projection (7) which, when said upper part and lower part are assembled together, extends into a respective recess or opening (8) in that one of said upper and lower parts not formed with said blade (5); andsaid openings define free spaces (9) surrounding said projections (7), which free spaces (9) are, in an assembled state of said upper and lower parts, filled by injection of plastic material, thereby forming a connecting plastic mass (10) which secures each free edge to the other of said upper and lower parts.