Scroll type fluid displacement apparatus with improved anti-wear

Details Scroll type fluid displacement apparatus with improved anti-wear Scroll type fluid displacement apparatus with improved anti-wear

1986-06-20

1987-02-24

Vrablik, John J.

Rotary expansible chamber devices

Working member has planetary or planetating movement

Helical working member, e.g., scroll

418 83, 418142, 418178, F04C 1804, F04C 2700, F04C 2904

Patent

active

046454365

ABSTRACT:
A scroll type fluid displacement apparatus is disclosed which includes a pair of scrolls each having a circular end plate and a spiral element extending from one end surface of the circular end plate. The pair of scrolls are maintained at an angular and radial offset so that both spiral elements interfit to form a plurality of line contacts between their spiral curved surfaces to thereby seal off and define at least one pair of fluid pockets. The fluid pockets are moved by relative orbital motion of the pair of scrolls. At least one of the circular end plates is provided with an anti-wear plate covering the end surface thereof in the area on which an axial end surface of the opposing spiral element slidably contacts. The circular end plate has a depressed portion at the center portion thereof to define an axial clearance between the anti-wear plate and the central portion of the end plate. Therefore, changes in the axial length of the spiral element due to temperature changes is absorbed by the deformation of the anti-wear plate into the depressed portion.

REFERENCES:
patent: 612695 (1898-10-01), Backman
patent: 801182 (1905-10-01), Creux
patent: 1557720 (1925-10-01), Mueller
patent: 1914499 (1933-06-01), Geisse
patent: 3994635 (1976-11-01), McCullough
patent: 4487560 (1984-12-01), Uchikawa et al.
patent: 4498852 (1985-02-01), Hiraga

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