US 12,456,907 B2
Air gap magnetic coupling with thermal isolation
Ronald J. Forni, Lexington, MA (US)
Assigned to Agilent Technologies, Inc., Santa Clara, CA (US)
Appl. No. 18/700,684
Filed by Agilent Technologies, Inc., Santa Clara, CA (US)
PCT Filed Oct. 22, 2021, PCT No. PCT/US2021/056354
§ 371(c)(1), (2) Date Apr. 11, 2024,
PCT Pub. No. WO2023/069119, PCT Pub. Date Apr. 27, 2023.
Prior Publication US 2024/0405653 A1, Dec. 5, 2024
Int. Cl. H02K 49/10 (2006.01); F04C 2/02 (2006.01); F04C 18/02 (2006.01); F04C 29/00 (2006.01); H02K 5/124 (2006.01); H02K 5/18 (2006.01)
CPC H02K 49/108 (2013.01) [F04C 2/025 (2013.01); F04C 18/0215 (2013.01); F04C 29/0064 (2013.01); H02K 5/124 (2013.01); H02K 5/18 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A magnetic coupling assembly, comprising:
a drive shaft rotatable on a drive axis;
a driven shaft rotatable on the drive axis;
a drive magnet assembly coupled to the drive shaft and rotatable therewith;
a driven magnet assembly coupled to the driven shaft and rotatable therewith, and spaced from the drive magnet assembly by an air gap;
a first housing coupled to the driven shaft and rotatable therewith, the first housing comprising at least one first seal surface;
a second housing disposed about the drive axis and surrounding the first housing, the second housing comprising at least one second seal surface, wherein the first housing and the second housing at least partially define a chamber disposed about the drive axis; and
a labyrinth seal comprising a sealing gap formed between the at least one first seal surface and the at least one second seal surface and fluidly communicating with the chamber, wherein:
the chamber is disposed axially between the sealing gap and the driven magnet assembly; and
the sealing gap has a size effective to limit gas conductance therethrough and thereby thermally isolate the chamber from a region external to the sealing gap and the chamber.