초록

A submersible pump unit having a wet-running electric motor and only a single impeller can be driven by the electric motor with a rotation speed greater than 20,000 rpm. The rotor of the electric motor has a diameter of less than 25 mm.

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1. A submersible pump assembly having a wet-running electric motor (11), only a single impeller (8), wherein the impeller is drivable by the electric motor (11) at a rotational speed of greater than 20,000 rpm, wherein a permanent magnet rotor (12) of the electric motor has a diameter smaller than 2

1. A submersible pump assembly having a wet-running electric motor (11), only a single impeller (8), wherein the impeller is drivable by the electric motor (11) at a rotational speed of greater than 20,000 rpm, wherein a permanent magnet rotor (12) of the electric motor has a diameter smaller than 25 mm and wherein at least one axial end side (40) of the impeller (8) on a side of the impeller facing away from the electric motor forms a thrust bearing surface comprising axial end sides (44) of impeller blades (42). 2. The submersible pump assembly according to claim 1, wherein the impeller (8) is axially sealed in a region of a suction port (48) of the pump assembly. 3. The submersible pump assembly according to claim 1, wherein the impeller (8) is fixed on a rotor shaft (10) in an axial direction (X). 4. The submersible pump assembly according to claim 1, wherein an axial side (50) of the impeller (8), which faces the electric motor (11), forms a sealing surface (52) for sealing a rotor space (28) of the electric motor (11). 5. The submersible pump assembly according to claim 1, wherein the impeller (8) comprises at least one surface of carbide or ceramic. 6. The submersible pump assembly according to claim 1, further comprising an upthrust washer (46) facing the impeller (8), the upthrust washer bearing on the at least one axial end side (40) of the impeller (8) such that it forms another thrust bearing surface. 7. The submersible pump assembly according to claim 6, wherein the upthrust washer (46) comprises at least one surface of carbide or ceramic material. 8. The submersible pump assembly according to claim 1, wherein the impeller (8) is surrounded by a spiral housing (6). 9. The submersible pump assembly according to claim 8, wherein the spiral housing (6) extends helically in a manner such that an exit opening of the spiral housing (6) is aligned with the impeller (8) in an axial direction (X). 10. The submersible pump assembly according to claim 1, further comprising a can (14) for the electric motor, the can comprising a non-metallic material, wherein the non-metallic material further comprises at least one additional, hermetically sealing layer (38). 11. The submersible pump assembly according to claim 10, wherein the at least one additional layer (38) comprises a coating on an inner and/or outer peripheral surface of the non-metallic material. 12. The submersible pump assembly according to claim 11, wherein the at least one additional layer (38) comprises a metallization of the non-metallic material. 13. The submersible pump assembly according to claim 10, wherein the can (14) comprises a fiber-reinforced plastic. 14. The submersible pump assembly according to claim 10, wherein the can (14) comprises a tubular component (22) and a base element (30), the base element closing the tubular component (22) at a first axial end (24) of the tubular component. 15. The submersible pump assembly according to claim 14, wherein the base element (30) is molded with the tubular component (22). 16. The submersible pump assembly according to claim 14, wherein the tubular component (22) and the base element (30) comprise the non-metallic material, and after assembly the tubular component and the base element are commonly provided with the at least one additional layer (38). 17. The submersible pump assembly according to claim 10, further comprising a radially outwardly extending collar (34) formed on an outer periphery at one axial end (26) of the can (14). 18. The submersible pump assembly according to claim 17, wherein the collar (34) is connected to the non-metallic material with a positive fit and/or material fit, and together with the non-metallic material is provided with the at least one additional layer (38). 19. The submersible pump assembly according to claim 17, wherein a surface (36) of the collar (34) is structured before connection to the non-metallic material of the can (14).