Electromechanical actuators for refrigerant flow control

Patent metadata

Field	Value
Publication number	US-11466698-B2
Application number	US-201916524428-A
Country	US
Kind code	B2
Filing date	Jul 29, 2019
Priority date	Jul 30, 2018
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

An actuator assembly includes a first actuator, a second actuator, and a moving piece that is disposed between the first actuator and the second actuator. The moving piece is positionable to close a gap in the compressor.

First claim

What is claimed is:

1. An actuator assembly, comprising:
a first actuator;
a second actuator, wherein bodies of the first actuator and second actuator are each C shaped in cross section to create a slot, and each slot receives a first coil and a second coil, the first coils are wound in the same direction as one another, and the second coils are wound in opposite directions from one another; and
a moving piece disposed between the first actuator and the second actuator and positionable to close a gap in a compressor.

2. The actuator as recited in claim 1 , wherein the moving piece includes a channel configured to allow refrigerant to leak to the first actuator side.

3. The actuator assembly as recited in claim 1 , comprising
permanent magnets disposed at the moving piece.

4. A centrifugal compressor comprising:
an impeller;
a gap near an exit of the impeller;
an actuator assembly, comprising:
a first actuator;
a second actuator, wherein bodies of the first actuator and second actuator are each C shaped in cross section to create a slot, and each slot receives a first coil and a second coil, the first coils are wound in the same direction as one another, and the second coils are wound in opposite directions from one another; and
a moving piece disposed between the first actuator and the second actuator and positionable to close the gap.

5. The compressor as recited in claim 4 , wherein an axial thickness of the moving piece is greater than an axial thickness of the gap.

6. The compressor as recited in claim 5 , wherein an axial thickness of the moving piece is about 1 mm greater than an axial thickness of the gap.

7. The compressor as recited in claim 4 , wherein the moving piece includes a channel configured to allow refrigerant to leak to the first actuator side.

8. The compressor as recited in claim 3 , comprising
permanent magnets disposed at the moving piece.

9. A refrigerant system, comprising:
a centrifugal compressor comprising:
an impeller;
a gap near an exit of the impeller;
an actuator assembly, comprising:
a first actuator;
a second actuator, wherein bodies of the first actuator and second actuator are each C shaped in cross section to create a slot, and each slot receives a first coil and a second coil, the first coils are wound in the same direction as one another, and the second coils are wound in opposite directions from one another; and
a moving piece disposed between the first actuator and the second actuator and positionable to close the gap.

10. The system as recited in claim 9 , wherein an axial thickness of the moving piece is greater than an axial thickness of the gap.

11. The system as recited in claim 10 , wherein an axial thickness of the moving piece is about 1 mm greater than an axial thickness of the gap.

12. The system as recited in claim 9 , wherein the system is a refrigerant cooling system.

13. The system as recited in claim 9 , wherein the system is a heat pump system.

Assignees

• Danfoss As

Inventors

• Gonzalez Delvis Anibal
• Rasmussen Mogens

Classifications

• F04D29/464 Primary

  adjusting flow cross-section, otherwise than by using adjustable stator blades · CPC title

• H01F7/1646

  Armatures or stationary parts of magnetic circuit having permanent magnet · CPC title

• H01F7/081

  Magnetic constructions · CPC title

• H01F2007/1692

  Electromagnets or actuators with two coils · CPC title

• F04D27/00 Primary

  Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids · CPC title