ROTARY PUMP

• US 20130164161A1
• Filed: 09/01/2010
• Published: 06/27/2013
• Est. Priority Date: 09/01/2010
• Status: Active Grant

• Current Assignee: Levitronix GmbH (George N. Hatsopoulos, PhD)
• Original Assignee: Levitronix GmbH (George N. Hatsopoulos, PhD)
• Inventors: Schb, Reto
• Granted Patent: US 9,835,158 B2
• Time in Patent Office: Days
• US Class Current: 417/420
• CPC Class Codes: F04D 1/006 double suction pumps
• CPC Class Codes: F04D 13/06 the pump being electrically driven
• CPC Class Codes: F04D 13/0633 Details of the bearings
• CPC Class Codes: F04D 13/064 Details of the magnetic circuit
• CPC Class Codes: F04D 13/0646 the hollow pump or motor shaft being the conduit for the working fluid
• CPC Class Codes: F04D 29/048 magnetic; electromagnetic
• CPC Class Codes: H02K 1/06 characterised by the shape, form or construction

Abstract

Disclosed is a rotary pump including a magnetic rotor arranged in a pump housing and having a magnetic rotor plane, which rotor is operatively connected to a drive for conveying a fluid. The drive is a bearingless motor having a stator configured as a bearing stator and drive stator and having a magnetic stator plane, wherein the stator bears a drive coil and a bearing coil lying in the stator plane and/or a drive bearing coil. The rotor is magnetically contactlessly journalled within the stator, wherein an axial height (H) of the rotor is smaller than or equal to half a diameter (D) of the rotor so that the rotor is passively magnetically stabilized by reluctance forces with respect to the magnetic stator plane both against axial displacement and against a tilt from an equilibrium position.

Claims

1. A rotary pump, including a magnetic rotor arranged in a pump housing and having a magnetic rotor plane, which rotor is operatively connected to a drive for conveying a fluid, wherein an inlet opening is provided at the pump housing for the inlet of the fluid into the pump housing and a radial outlet passage is provided for conveying the fluid out of the pump housing and wherein the drive is a bearingless motor having a stator configured as a bearing stator and drive stator and having a magnetic stator plane, which stator bears a drive coil and a bearing coil lying in the stator plane and/or a drive bearing coil, wherein the rotor is magnetically contactlessly journalled within the stator and an axial height of the rotor is smaller than or equal to half a diameter of the rotor so that the rotor is passively magnetically stabilized by reluctance forces with respect to the magnetic stator plane both against an axial displacement and against a tiling from an equilibrium position, characterized in that the outlet passage is radially outwardly conducted away from the pump housing in the region of the stator such that a center axis of the radial outlet passage coincides with the magnetic rotor plane or with the magnetic stator plane.

2. A rotary pump in accordance with claim 1, wherein the stator has a gap in the peripheral direction in which the radial outlet passage is arranged.

3. A rotary pump in accordance with claim 1, wherein the stator is ferromagnetic.

4. A rotary pump in accordance with claim 1, wherein a drive coil and/or a bearing coil and/or a drive bearing coil is provided at a coil core.

5. A rotary pump in accordance with claim 1, wherein the coil core is provided in the form of an E-shaped coil core at the stator.

6. A rotary pump in accordance with claim 1, wherein the coil core is provided in the form of a bar-shaped coil core at the stator.

7. A rotary pump in accordance with claim 1, wherein the coil core is provided in the form of an inner coil core within the stator.

8. A rotary pump in accordance with claim 1, wherein the coil core is configured in the form of a stator tooth extending toward the rotor at the stator.

9. A rotary pump in accordance with claim 1, wherein two coil cores are geometrically differently configured at one and the same stator.

10. A rotary pump in accordance with claim 1, wherein two drive coils are asymmetrically ordered with respect to the peripheral direction of the stator.

11. A rotary pump in accordance with claim 1, wherein two bearing coils are asymmetrically ordered with respect to the peripheral direction of the stator.

12. A rotary pump in accordance with, claim 1, wherein two drive bearing coils are asymmetrically ordered with respect to the peripheral direction of the stator.

13. A rotary pump in accordance with claim 1, wherein the rotor can be acted on by the fluid flowing into the pump housing at both sides with respect to an axial axis of rotation;

and/or wherein two inlet passages disposed opposite with respect to the rotor plane are provided.

14. A rotary pump in accordance with claim 13, wherein an axially extending inlet passage is provided which is arranged centrally about the axis of rotation and which extends through the rotor.

15. A rotary pump in accordance with claim 14, wherein outlet openings for acting on the rotor by the fluid at both sides are provided at both sides with respect to the magnetic rotor plane at the axial inlet passage.