Scroll compressor with a thrust plate and a flexible thrust sheet member

Patent metadata

Field	Value
Publication number	US-12092104-B2
Application number	US-202118261041-A
Country	US
Kind code	B2
Filing date	Dec 17, 2021
Priority date	Jan 22, 2021
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

To reduce surface pressure acting on a tip of a winding terminal portion of a spiral wall of an orbiting scroll in a scroll compressor. In a scroll compressor 10 , a thrust plate 81 and a thrust sheet 82 capable of being elastically deformed are provided between an opposing surface 237 serving as a thrust receiving part and an orbiting base plate 521 of an orbiting scroll 52 . A first sealing member 83 seals between the orbiting base plate 521 and the thrust sheet 82 and a second sealing member 84 having a diameter greater than that of the first sealing member 83 seals the opposing surface 237 of a second partition wall 232 and the thrust plate 81 . A back pressure chamber H 5 is partitioned from a suction pressure area (space H 6 ) by the thrust plate 81 , thrust sheet 82 , the first sealing member 83 , and the second sealing member 84 . A circular concave portion 816 is formed on a surface of the thrust plate 81 on the thrust sheet 82 side.

First claim

The invention claimed is:

1. A scroll compressor comprising:
a drive shaft;
a fixed scroll including a fixed base plate and a fixed spiral wall erected on the fixed base plate; and
an orbiting scroll including an orbiting base plate and an orbiting spiral wall that is erected on the orbiting base plate and meshes with the fixed spiral wall,
wherein the scroll compressor is configured such that a volume of a compression chamber formed between the fixed scroll and the orbiting scroll changes and a fluid taken into the compression chamber is thereby compressed when the orbiting scroll orbits with respect to the fixed scroll along with a rotation of the drive shaft,
wherein the scroll compressor further comprises
an annular plate member that is provided on a back surface side of the orbiting base plate of the orbiting scroll and has a diameter greater than a diameter of the orbiting scroll,
an annular sheet member that is provided between the back surface of the orbiting base plate of the orbiting scroll and the annular plate member, has a diameter substantially equal to the diameter of the annular plate member, and is capable of being elastically deformed,
an annular first sealing member attached to a peripheral edge of the back surface of the orbiting base plate of the orbiting scroll, of which a tip slidably contacts the annular sheet member,
a thrust receiving part that receives, via the annular sheet member and the annular plate member, a thrust load that acts on the orbiting scroll due to a compression reaction force,
an annular second sealing member that is formed to have a diameter greater than a diameter of the first sealing member, attached to one of a surface of the annular plate member on the thrust receiving part side and the thrust receiving part, and of which a tip contacts the other one of the surface of the annular plate member on the thrust receiving part side and the thrust receiving part, and
a back pressure chamber that is partitioned from a suction pressure area by the annular plate member, the annular sheet member, the first sealing member, and the second sealing member and applies a back pressure load that presses the orbiting scroll against the fixed scroll due to the annular sheet member contacting the orbiting scroll, and
wherein a circular concave portion is formed on a surface of the annular plate member on the annular sheet member side.

2. The scroll compressor according to claim 1 , wherein, when viewed from an axial direction of the drive shaft, the circular concave portion is formed to be positioned inward of a sliding area in which the first sealing member slides with respect to the annular sheet member along with an orbiting motion of the orbiting scroll.

3. The scroll compressor according to claim 2 , wherein the circular concave portion is formed to have a diameter substantially equal to or less than an outer diameter of the first sealing member.

4. The scroll compressor according to claim 2 ,
wherein the annular plate member is provided so as to be movable in the axial direction of the drive shaft, and
wherein the second sealing member has elasticity and is pressed to be elastically deformed between the annular plate member and the thrust receiving part.

5. The scroll compressor according to claim 1 , wherein the circular concave portion is formed to have a diameter substantially equal to or less than an outer diameter of the first sealing member.

6. The scroll compressor according to claim 5 ,
wherein the annular plate member is provided so as to be movable in the axial direction of the drive shaft, and
wherein the second sealing member has elasticity and is pressed to be elastically deformed between the annular plate member and the thrust receiving part.

7. The scroll compressor according to claim 1 ,
wherein the annular plate member is provided so as to be movable in the axial direction of the drive shaft, and
wherein the second sealing member has elasticity and is pressed to be elastically deformed between the annular plate member and the thrust receiving part.

8. The scroll compressor according to claim 7 ,
wherein the annular plate member has two positioning pins each protruding from a surface of the annular plate member on the thrust receiving part side, and
wherein the two positioning pins are each configured to be inserted into a corresponding one of two positioning holes formed on the thrust receiving part so as to be movable in the axial direction of the drive shaft, thereby positioning the annular plate member with respect to the thrust receiving part such that the annular plate member is prevented from rotating.

9. The scroll compressor according to claim 8 ,
wherein the annular plate member has a plurality of rotation preventing pins each protruding from a surface of the annular plate member on the orbiting scroll side, and
wherein the plurality of rotation preventing pins are each configured to extend passing through the annular sheet member and to be loosely fitted into a corresponding one of circular holes formed on the back surface of the orbiting base plate of the orbiting scroll to prevent rotation of the orbiting scroll.

10. The scroll compressor according to claim 7 ,
wherein the annular plate member has a plurality of rotation preventing pins each protruding from a surface of the annular plate member on the orbiting scroll side, and
wherein the plurality of rotation preventing pins are each configured to extend passing through the annular sheet member and to be loosely fitted into a corresponding one of circular holes formed on the back surface of the orbiting base plate of the orbiting scroll to prevent rotation of the orbiting scroll.

Assignees

• Sanden Corp

Inventors

• TESHIMA Atsuo
• Sato Taizo
• MASHIYAMA Hiroki

Classifications

• F04C27/008

  for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine · CPC title

• F04C29/0028

  Internal leakage control · CPC title

• F04C2240/80

  Other components · CPC title

• F04C29/0021

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

• F04C23/008

  Hermetic pumps · CPC title