Rotating scroll compressor having a movable bearing member

• US 5,803,722 A
• Filed: 05/28/1996
• Issued: 09/08/1998
• Est. Priority Date: 03/24/1994
• Status: Expired due to Term

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Sugimoto, Kazuyoshi, Noboru, Yoshinori
• Primary Examiner(s): Vrablik, John J.
• Application Number:
  US08/654,018
• Time in Patent Office: 833 Days
• Field of Search: 418/55.5, 418/57, 418/188
• US Class Current: 418/55.5
• CPC Class Codes: F01C 21/102 Adjustment of the interstices between moving and fixed parts of the machine by means other than fluid pressure
• CPC Class Codes: F04C 18/023 where both members are moving
• CPC Class Codes: F04C 2230/602 Gap; Clearance
• CPC Class Codes: F04C 23/008 Hermetic pumps
• CPC Class Codes: F04C 27/001 Radial sealings for working fluid
• CPC Class Codes: F04C 29/0057 for eccentric movement

Abstract

A rotating type scroll compressor according to the present invention having a closed shell that houses an electric drive member and a scroll compressing member, the scroll compressing member having a drive scroll member having a drive scroll member and a follower scroll member, the drive scroll member having a spiral shape wrap formed on a end plate and being driven by the electric drive member, the follower scroll member having a center axial line that deviates from a center axial line of the drive scroll member and a spiral shape wrap fitting to the wrap of the drive scroll member, said rotating type scroll compressor comprising rotating shaft portions to which radial force of the rotating drive scroll member and the follower scroll member is applied, said rotating shaft portions being disposed at an upper portion and a lower portion of the wraps to which the radial load of fluid is applied.

Claims

1. A rotating scroll compressor comprising:

a scroll compressing unit including a drive scroll member having a spiral-shaped wrap extending in a first direction from an end plate,

a follower scroll member having a center axial line that deviates from a center axial line of said drive scroll member by an eccentric amount and having a spiral-shaped wrap extending in a direction opposite to said first direction and interfitting with said spiral-shaped wrap of said drive scroll member, compression spaces being formed between said drive scroll member and said follower scroll member, the side walls of said wraps of said drive scroll member and said follower scroll member being in contact with each other so as to seal the compression spaces in the radial direction;

an electric drive unit having a first shaft portion coupled to said drive scroll member to rotate said drive scroll member;

a main bearing within which said first shaft portion rotates;

means for coupling said drive scroll member to said follower scroll member to rotate said follower scroll member;

an upper shaft portion connected to said follower scroll member and an auxiliary bearing member within which said upper shaft portion rotates;

an auxiliary frame secured to said main bearing within which said auxiliary bearing is moveable;

said rotating upper shaft portion being subject to the applied radial force of the fluid compressed by said rotating drive scroll member and said follower scroll member, and said auxiliary bearing member being moveable in a direction toward said auxiliary frame; and

an elastic member on each of two spaced planes perpendicular to and opposite the axial line of the axis of rotation of said rotating upper shaft portion for tensioning said auxiliary bearing member to increase the eccentric amount of said upper shaft portion relative to the center axial line of said drive scroll member.

2. The rotating type scroll compressor as set forth in claim 1, wherein the moving direction of said auxiliary bearing member has a predetermined angle in an eccentric direction that connects the rotating center axial line of said drive scroll member and the rotating center axial line of said follower scroll member, said auxiliary bearing member being moved so that a component of the load of the fluid in the radial direction that works for said follower scroll member causes the eccentric amount to increase.

3. The rotating scroll compressor as set forth in claim 1, wherein the part of the elastic member closest to the wraps of the scroll members tensions said auxiliary bearing member in the eccentric direction, and the part of the elastic member more remote from the wraps of the scroll members tensions said auxiliary bearing member in the opposite direction to that of the eccentric direction.