Rotary pump

Patent metadata

Field	Value
Publication number	US-9835158-B2
Application number	US-201013820491-A
Country	US
Kind code	B2
Filing date	Sep 1, 2010
Priority date	Sep 1, 2010
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

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.

First claim

The invention claimed is:

1. A rotary pump, including a magnetic rotor arranged in a pump housing and having a magnetic rotor plane, wherein the magnetic rotor plane coincides with a center plane of the magnetic rotor, wherein the 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 journaled 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 tilting 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, wherein the stator has a gap in the peripheral direction in which the radial outlet passage is arranged, the rotary pump further comprising a ring-shaped bridge element made from light plastic to connect opposite ends of the stator forming the gap.

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

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

4. A rotary pump in accordance with claim 3 , wherein the coil core is provided in the form of an E-shaped coil core at the stator.

5. A rotary pump in accordance with claim 3 , wherein the coil core is provided in the form of a bar-shaped coil core at the stator.

6. A rotary pump in accordance with claim 3 , wherein the coil core is provided in the form of an inner coil core within the stator.

7. A rotary pump in accordance with claim 3 , wherein the coil core is configured in the form of a stator tooth extending toward the rotor at the stator.

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

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

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

11. 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.

12. A rotary pump in accordance with claim 1 , wherein the rotor is acted on by the fluid flowing into the pump housing at both sides with respect to an axis of rotation; and/or wherein two inlet passages disposed opposite with respect to the rotor plane are provided.

13. A rotary pump in accordance with claim 1 , wherein an axially extending inlet passage is provided which is arranged centrally about an axis of rotation and which extends through the rotor.

14. A rotary pump in accordance with claim 13 , wherein outlet openings allowing fluid to act on both sides of the rotor are provided at both sides of the axial inlet passage with respect to the magnetic rotor plane.

15. A rotary pump in accordance with claim 1 , wherein rotor impellers are provided on both sides of the rotor to generate a symmetrical pump performance with respect to the rotor plane up to the radial outlet passage.

16. A rotary pump in accordance with claim 1 , wherein the fluid flows into the pump housing via two inflow passages intersecting to form a V-shape, wherein the two inflow passages are fed by a single passage.

17. A rotary pump in accordance with claim 1 , further comprising a ferromagnetic ring-shaped element to connect opposite ends of the stator forming the gap and to guide magnetic flux.

18. A rotary pump, including a magnetic rotor arranged in a pump housing and having a magnetic rotor plane, wherein the magnetic rotor plane coincides with a center plane of the magnetic rotor, wherein the 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 journaled 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 tilting 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, wherein the stator has a gap in the peripheral direction in which the radial outlet passage is arranged, the rotary pump further comprising a ferromagnetic ring-shaped element to connect opposite ends of the stator forming the gap and to guide magnetic flux.

Assignees

• Schöb Reto
• Levitronix Gmbh

Inventors

• Schöb Reto

Classifications

• F04D29/048

  magnetic; electromagnetic · CPC title

• F04D13/0633

  Details of the bearings · CPC title

• F04D13/0646

  the hollow pump or motor shaft being the conduit for the working fluid · CPC title

• F04D13/06

  the pump being electrically driven · CPC title

• F04D13/064

  Details of the magnetic circuit · CPC title