Posture control of a balance weight in a scroll compressor

Patent metadata

Field	Value
Publication number	US-10208750-B2
Application number	US-201515311421-A
Country	US
Kind code	B2
Filing date	May 8, 2015
Priority date	Jun 11, 2014
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

A posture control unit (contact portion) that controls a posture of a balance weight-equipped slider so that a slider portion of the balance weight-equipped slider maintains the posture parallel to an orbiting bearing is provided at a position corresponding to a central portion in an axial direction of the orbiting bearing between an eccentric direction-side side surface of an eccentric shaft portion of a rotary shaft and an inner wall surface of a slide hole facing the side surface.

First claim

The invention claimed is:

1. A scroll compressor comprising:
a fixed scroll provided in a container;
an orbiting scroll configured to orbit relative to the fixed scroll;
a rotary shaft configured to transmit rotational drive force to the orbiting scroll;
an eccentric shaft portion provided on one end side of the rotary shaft to be eccentric to the rotary shaft;
a balance weight-equipped slider integrated of a slider portion having a slide hole and a balance weight portion, in a plane perpendicular to an axis of the rotary shaft, movable along the slide hole relative to the eccentric shaft portion inserted in the slide hole, and having centrifugal force set to be greater than centrifugal force of the orbiting scroll;
an orbiting bearing provided to the orbiting scroll and rotatably supporting the slider portion of the balance weight-equipped slider; and
a convex portion having a curved surface with one vertex, provided to one of an eccentric direction-side side surface of the eccentric shaft portion and an inner wall surface of the slide hole facing the side surface, configured to act as a posture control unit, the one vertex is located at a position corresponding to a central portion in an axial direction of the orbiting bearing between the eccentric direction-side side surface of the eccentric shaft portion and the inner wall surface of the slide hole facing the side surface, and configured to control a posture of the balance weight-equipped slider so that the slider portion of the balance weight-equipped slider maintains the posture parallel to the orbiting bearing,
wherein the convex portion is configured to make point contact at one point when the slider portion is moved in a counter-eccentric direction.

2. The scroll compressor of claim 1 , wherein the convex portion has a hemispherical shape.

3. The scroll compressor of claim 1 , wherein the convex portion has a shape with a convex curved surface formed by a locus obtained by moving a first circular arc along a second circular arc perpendicular to the first circular arc.

4. The scroll compressor of claim 1 , wherein the convex portion has an elliptical, hemispherical shape having different curvatures on one curved surface.

5. The scroll compressor of claim 1 , further comprising an elastic body configured to bias the slider portion toward an eccentric direction to press the orbiting scroll toward the eccentric direction.

6. The scroll compressor of claim 5 , wherein the elastic body comprises a disc spring.

7. The scroll compressor of claim 5 , wherein the elastic body comprises a coil spring.

8. The scroll compressor of claim 5 , wherein one of the eccentric direction-side side surface of the eccentric shaft portion and the inner wall surface of the slide hole facing the side surface has a recess configured to store a part of the elastic body.

9. The scroll compressor of claim 1 , further comprising a magnetic force generating unit configured to generate magnetic force for causing the eccentric direction-side side surface of the eccentric shaft portion and the inner wall surface of the slide hole facing the side surface to magnetically attract each other.

Assignees

• Mitsubishi Electric Corp

Inventors

• Kawamura Raito
• Sekiya Shin
• Wakamoto Shinichi
• Shimoji Mihoko
• Nagata Hideaki

Classifications

• F04C2240/60

  Shafts · CPC title

• F04C23/008

  Hermetic pumps · CPC title

• F04C29/0057

  for eccentric movement · CPC title

• F04C2240/807

  Balance weight, counterweight · CPC title

• F04C18/0215 Primary

  where only one member is moving · CPC title