US 5,702,241 AGranted

Scroll-type fluid displacement apparatus having sealing means for central portions of the wraps

AssigneeSanden Corporation

InventorsTakayuki Matsumoto, Yasuomi Matsumoto, Hiroshi Fujita

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Abstract

A scroll-type fluid displacement apparatus includes a first and a second scroll, each having an end plate and a spiral wrap extending from one side of the end plate. The spiral wraps interfit at an angular and radial offset to make a plurality of line contacts which define a pair of fluid pockets. A driving mechanism is operatively connected to the first scroll to orbit the first scroll relative to the second scroll while preventing rotation of the second scroll, to thereby change the volume of the pair of fluid pockets. Sealing elements are disposed in the axial ends of the spiral wraps for sealing a central portion of fluid pockets defined by the spiral wraps. Thus, the axial sealing of fluid pocket formed between the orbiting and fixed scroll is more secure in all process from the suction to the discharge stage. Further, the volumetric efficiency of the compressor increases.

Claims6

Dependent claims

A scroll-type fluid displacement apparatus comprising:

a pair of scrolls each having an end plate and a spiral wrap extending from a side of said end plate, said spiral wraps interfitting at an angular and radial offset to form a plurality of line contacts which define at least one pair of fluid pockets;
a driving mechanism operatively connected to a first scroll of said scrolls to orbit said first scroll relative to a second scroll of said scrolls, while preventing rotation of said second scroll, to thereby change a volume of said at least one pair of fluid pockets;
and
sealing means disposed in at least one axial end of said spiral wraps for sealing said at least one pair of fluid pocket when defined by a central portion of said spiral wraps, said sealing means including a protruding portion protruding from said at least one axial end of said spiral wraps, wherein a height of said protruding portion increases towards a radial inner end of said spiral wraps.

1 more element

Dependencies are inferred from the claim text.