Scroll compressor with coated sliding surface
AssigneeLiebherr-Aerospace Toulouse SAS
InventorEric Monet
Life of this patent
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Abstract
A compression device includes at least: two interleaved scrolls each of which is made of an aluminum alloy, one of the scrolls, being a fixed scroll (3), and is fixed and the other scroll, which is an orbiting scroll and moves eccentrically without rotating. Also included are anti-rotation means made of an aluminum alloy and configured to allow anti-rotation of the orbiting scroll. The compression device also includes one flat thrust bearing configured to axially contain the orbiting scroll and is made of aluminum alloys or grades of cast iron. The compression device also includes coatings for promoting friction between the fixed scroll, the orbiting scroll, the anti-rotation means and the flat thrust bearing.
Claims13
Compression device comprising at least:
- two interleaved scrolls (3, 5) each formed from an alloy with a density less than 5000 kg/m3, the two interleaved scrolls including a fixed scroll (3), which is fixed, and an orbiting scroll (5), which moves eccentrically without rotating,
- anti-rotation means made of the alloy and configured to allow anti-rotation of said orbiting scroll (5), and
- a flat thrust bearing (7) configured to axially retain the orbiting scroll (5),
- wherein a surface of the orbiting scroll (5) configured to come into contact with the flat thrust bearing is covered with a first thick coating, with a thickness between 40 and 200 μm, with a hardness greater than 1100 HV and mostly comprised of an oxide derived from the alloy.
Dependencies are inferred from the claim text.