Scroll compressor

Patent metadata

Field	Value
Publication number	US-10851780-B2
Application number	US-201716328106-A
Country	US
Kind code	B2
Filing date	Jun 28, 2017
Priority date	Aug 31, 2016
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

A scroll compressor includes a compression mechanism having fixed and movable scrolls forming a compression chamber, a motor to drive the movable scroll, a drive shaft, a casing, a housing accommodated inside the casing, and a floating member supported by the housing. The casing accommodates the compression mechanism, the motor, and the drive shaft. The floating member can be pushed toward the movable scroll by a pressure in a back pressure space formed between the floating member and the housing. The floating member may include a plurality of supported portions arranged circumferentially at three or more locations, and the housing may include a supporting portion supporting the supported portions. Alternatively, the floating member may include a body member and an outer peripheral member separate from the body member, the outer peripheral member mounted to an outer periphery of the body member, and the housing supports the outer peripheral member.

First claim

What is claimed is:

1. A scroll compressor comprising:
a compression mechanism including
a fixed scroll including a fixed-side wrap having a spiral shape, and
a movable scroll including a movable-side wrap having a spiral shape, the movable scroll together with the fixed-side wrap defining a compression chamber,
the compression mechanism being configured to discharge a refrigerant compressed in the compression chamber;

a motor configured to drive the movable scroll to cause the movable scroll to revolve relative to the fixed scroll;
a drive shaft coupling the movable scroll to the motor;
a casing accommodating the compression mechanism, the motor, and the drive shaft therein;
a housing accommodated in the casing; and
a floating member configured to be pushed toward the movable scroll by a pressure in a back pressure space, the back pressure space being formed between the floating member and the housing to press the movable scroll against the fixed scroll,
the floating member including a pressing portion having a cylindrical shape configured to contact the movable scroll and to press the movable scroll against the fixed scroll, the pressing portion having a circumferential groove on an inner surface thereof,
the floating member being supported by the housing, and
one of
the floating member including a plurality of supported portions arranged circumferentially at three or more locations, and the housing including a supporting portion supporting the supported portions of the floating member such that the floating member is slidable in an axial direction of the drive shaft and reducing inclination of the floating member, an outermost peripheral side face of the floating member not contacting an inner peripheral side face of the housing when the scroll compressor is in operation, or
the floating member including a body member and an outer peripheral member separate from the body member, the outer peripheral member being mounted to an outer periphery of the body member, and the housing supporting the outer peripheral member such that the floating member is slidable in the axial direction of the drive shaft.

2. The scroll compressor according to claim 1 , wherein
each of the supported portions is a bush disposed on the floating member, and
the supporting portion includes bolts respectively inserted into the bushes.

3. The scroll compressor according to claim 2 , wherein
the floating member further includes a bearing pivotally supporting the drive shaft, and
a ratio of a first distance to a second distance falls within a range from 0.5 or more to 1.5 or less,
the first distance is measured from a center of each bush to a center of the movable-side wrap in the axial direction of the drive shaft, and
the second distance is measured from a center of the hearing to the center of each bush in the axial direction of the drive shaft.

4. The scroll compressor according to claim 1 , wherein
each of the supported portions is a ring disposed on the floating member, and
the supporting portion includes control pins respectively inserted into the rings.

5. The scroll compressor according to claim 1 , wherein
each of the supported portions is a recess or a protrusion disposed in or on the floating member, and
the supporting portion includes
protrusions disposed on the housing and respectively fitted into the recesses in the floating member, or
recesses disposed in the housing and into which protrusions on the floating member are respectively fitted.

Assignees

• Daikin Ind Ltd

Inventors

• Yosuke Yoshinobu
• Uekawa Takashi
• Zhao Yongsheng

Classifications

• F04C29/0021

  Systems for the equilibration of forces acting on the pump (interstice adjustment other than by fluid pressure F01C21/102) · CPC title

• F04C2240/10

  Stators · CPC title

• F04C27/005

  Axial sealings for working fluid · CPC title

• F04C18/02

  of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents · CPC title

• F04C23/008

  Hermetic pumps · CPC title