Scroll compressor

Patent metadata

Field	Value
Publication number	US-10859083-B2
Application number	US-201716085820-A
Country	US
Kind code	B2
Filing date	Mar 28, 2017
Priority date	May 20, 2016
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

A scroll compressor includes a slider including a cylindrical portion supported by a rocking bearing provided on an orbiting scroll so that it rotates freely, and a balance weight portion connected to the cylindrical portion. When a direction opposite to an eccentric direction of the orbiting scroll is a counter eccentric direction and a direction of a central axis of the rocking bearing is a Z-axis direction, the balance weight portion includes a main weight portion provided at a position distant from a center of rotation of the slider in the counter eccentric direction, and a counter-weight portion provided at a position spaced away from the orbiting scroll than a position of a center of the rocking bearing in the Z-axis direction and at a position distant from the center of rotation of the slider in the eccentric direction.

First claim

The invention claimed is:

1. A scroll compressor, comprising:
a fixed scroll;
an orbiting scroll configured to orbit relative to the fixed scroll;
a spindle configured to transfer a rotational driving force to the orbiting scroll;
an eccentric shaft portion provided at one end of the spindle and offset in an eccentric direction from a central axis of the spindle;
a slider having a slide groove formed therein so that the eccentric shaft portion is inserted into the slide groove so that the eccentric shaft portion slides freely; and
a rocking bearing provided on the orbiting scroll to support the slider so that the slider rotates freely,
wherein the slider comprises:
a cylindrical portion supported by the rocking bearing to rotate freely; and
a balance weight portion connected to the cylindrical portion,

wherein, when a direction opposite to the eccentric direction is a counter eccentric direction and a direction of the central axis is a Z-axis direction,
the balance weight portion comprises:
a main weight portion provided at a position distant from a center of rotation of the slider in the counter eccentric direction; and
a counter-weight portion provided at a position spaced away from the orbiting scroll than a center of the rocking bearing in the Z-axis direction and at a position distant from the center of rotation of the slider in the eccentric direction,

wherein a center of action in the Z-axis direction of a centrifugal force on the slider does not coincide with a center of action of the rocking bearing in the Z-axis direction, and
wherein a distance in the Z-axis direction between a center of action of a centrifugal force on the slider and the center of the rocking bearing is equal to, or smaller than, 0.09 times a length of the rocking bearing in the Z-axis direction.

2. The scroll compressor of claim 1 ,
wherein the main weight portion comprises:
a first main weight portion disposed toward the orbiting scroll in the Z-axis direction; and
a second main weight portion disposed at a position spaced away from the orbiting scroll than the first main weight portion in the Z-axis direction,

wherein the first main weight portion, the second main weight portion, and the counter-weight portion have arc-shaped outer peripheral surfaces, and
wherein at least one of the first main weight portion, the second main weight portion, and the counter-weight portion is different from other weight portions in terms of radii of the outer peripheral surfaces and positions of centers of the radii.

3. The scroll compressor of claim 1 ,
wherein the main weight portion comprises:
a first main weight portion disposed toward the orbiting scroll in the Z-axis direction; and
a second main weight portion disposed at a position spaced away from the orbiting scroll than the first main weight portion in the Z-axis direction,

wherein the second main weight portion and the counter-weight portion have arc-shaped outer peripheral surfaces, and
wherein the outer peripheral surface of the second main weight portion and the outer peripheral surface of the counter-weight portion are located on an identical circle.

4. The scroll compressor of claim 3 , wherein at least one of a position of a center of an outer peripheral surface of the cylindrical portion and a position of a center of the first main weight portion is a position identical to positions of centers of the outer peripheral surfaces of the second main weight portion and the counter-weight portion.

5. The scroll compressor of claim 1 ,
wherein the main weight portion and the counter-weight portion have arc-shaped outer peripheral surfaces, and
wherein the outer peripheral surface of the main weight portion and the outer peripheral surface of the counter-weight portion are located on an identical circle.

6. The scroll compressor of claim 5 , wherein a position of a center of an outer peripheral surface of the cylindrical portion and positions of centers of the outer peripheral surfaces of the main weight portion and the counter-weight portion are identical positions.

7. The scroll compressor of claim 1 , wherein, when L represents a distance in the Z-axis direction from an end of the cylindrical portion near the orbiting scroll to a part where the cylindrical portion and the counter-weight portion are connected,
the counter-weight portion comprises:
a first counter-weight portion connected to the cylindrical portion; and
a second counter-weight portion protruding from the first counter-weight portion toward the orbiting scroll and having a distal end spaced away toward the first counter-weight portion by L/2 or longer in the Z-axis direction from the end of the cylindrical portion near the orbiting scroll.

8. The scroll compressor of claim 1 , wherein the main weight portion has a hollow portion provided below the center of the rocking bearing in the Z-axis direction.

9. The scroll compressor of claim 8 ,
wherein the main weight portion has an arc-shaped outer peripheral surface, and
wherein the hollow portion is a recess provided in the outer peripheral surface of the main weight portion in a circumferential direction.

Assignees

• Mitsubishi Electric Corp

Inventors

• Takamura Yuji
• Matsui Tomokazu
• Kakuda Masayuki
• Nagata Hideaki

Classifications

• F04C2240/50

  Bearings · CPC title

• F05B2240/54

  Radial bearings · CPC title

• F04C18/0215

  where only one member is moving · CPC title

• F04C29/0021 Primary

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

• F05B2260/964

  by damping means · CPC title