Scroll compressor with first and second compression chambers having first and second discharge start points

Patent metadata

Field	Value
Publication number	US-11022120-B2
Application number	US-202017069502-A
Country	US
Kind code	B2
Filing date	Oct 13, 2020
Priority date	May 7, 2018
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

A scroll compressor includes a casing, a low-pressure space and a compression mechanism. The compression mechanism includes fixed and movable scrolls, a fluid chamber including first and second compression chambers, and an adjustment mechanism. The fluid chamber has different discharge start points between the first and second compression chambers. An oil inflow groove is formed in one sliding surface, and an oil relief passage is formed in the other sliding surface. The oil relief passage includes a communication portion that communicates with the oil inflow groove in a predetermined angular range, lubricating oil flowing from the oil inflow groove into the low-pressure space through the communication portion. The predetermined angular range is from a position between a discharge start point of the first compression chamber and a discharge start point of the second compression chamber to a position after the discharge start of the second compression chamber.

First claim

The invention claimed is:

1. A scroll compressor comprising:
a casing;
a low-pressure space inside the casing; and
a compression mechanism housed in the casing, the compression mechanism including
a fixed scroll including a fixed-side end plate having a disk shape, and a fixed-side wrap having a spiral shape and rising from the fixed-side end plate, the fixed scroll being fixed to the casing,
a movable scroll including a movable-side end plate having a disk shape that substantially slides on the fixed-side end plate, and a movable-side wrap having a spiral shape that rises from the movable-side end plate and has a different circumferential length from the fixed-side wrap, the movable scroll being configured to make an eccentric rotational motion with respect to the fixed scroll while meshing with the fixed scroll,
a fluid chamber including a first compression chamber formed between an inner peripheral surface of the fixed-side wrap and an outer peripheral surface of the movable-side wrap, and a second compression chamber formed between an outer peripheral surface of the fixed-side wrap and an inner peripheral surface of the movable-side wrap, the first compression chamber having a first discharge start point, and the second compression chamber having a second discharge start point, and
an adjustment mechanism including an oil inflow groove formed in one of a fixed-side sliding surface and a movable-side sliding surface where the fixed-side end plate and the movable-side end plate slide with each other, and an oil relief passage formed in an other one of the fixed-side sliding surface and the movable-side sliding surface,

high-pressure lubricating oil flowing into the oil inflow groove,
the oil relief passage including a communication portion that communicates with the oil inflow groove in a predetermined angular range in a circumferential direction during eccentric rotation of the movable scroll, the lubricating oil flowing from the oil inflow groove into the low-pressure space through the communication portion,
the first discharge start point being a first angular position of the movable scroll along the eccentric rotational motion of the movable scroll when the first compression chamber starts to discharge compressed refrigerant, the second discharge start point being a second angular position of the movable scroll along the eccentric rotational motion of the movable scroll when the second compression chamber starts to discharge compressed refrigerant, and the first and second discharge start points being angularly spaced from each other so that the first discharge start point occurs before the second discharge start point during the eccentric rotational motion of the movable scroll, and
a start point of the predetermined angular range being angularly positioned between the first discharge start point of the first compression chamber and the second discharge start point of the second compression chamber along the eccentric rotational motion of the movable scroll, an end point of the predetermined angular range being angularly positioned after the second discharge start point of the second compression chamber, the start point being formed at one end of the predetermined angular range in the circumferential direction, and the end point being formed at an other end of the predetermined angular range in the circumferential direction.

2. The scroll compressor according to claim 1 , wherein
the oil inflow groove is formed in the fixed-side sliding surface, and
the communication portion of the oil relief passage is formed in the movable-side sliding surface.

3. The scroll compressor according to claim 2 , wherein
the oil relief passage is formed by an oil relief groove formed in the movable-side sliding surface, and the oil relief passage is configured to communicate with a suction chamber included in the fluid chamber in the predetermined angular range.

4. The scroll compressor according to claim 3 , wherein
the oil inflow groove is formed in an angular range of 180° or more in the circumferential direction with respect to a center of the fixed-side end plate or the movable-side end plate.

5. The scroll compressor according to claim 3 , wherein
the second discharge start point of the second compression chamber is set in a first half of the predetermined angular range during the eccentric rotational motion of the movable scroll.

6. The scroll compressor according to claim 3 , wherein
a flow path cross-sectional area of the oil relief passage is smaller than a flow path cross-sectional area of the oil inflow groove.

7. The scroll compressor according to claim 2 , wherein
the oil relief passage is formed by a through hole that penetrates the movable-side end plate from the movable-side sliding surface to a rear surface of the movable-side end plate, and
a back pressure chamber having a pressure lower than a discharge pressure of the fluid chamber is formed on the rear surface of the movable-side end plate.

8. The scroll compressor according to claim 7 , wherein
the oil inflow groove is formed in an angular range of 180° or more in the circumferential direction with respect to a center of the fixed-side end plate or the movable-side end plate.

9. The scroll compressor according to claim 7 , wherein
the second discharge start point of the second compression chamber is set in a first half of the predetermined angular range during the eccentric rotational motion of the movable scroll.

10. The scroll compressor according to claim 7 , wherein
a flow path cross-sectional area of the oil relief passage is smaller than a flow path cross-sectional area of the oil inflow groove.

11. The scroll compressor according to claim 2 , wherein
the oil inflow groove is formed in an angular range of 180° or more in the circumferential direction with respect to a center of the fixed-side end plate or the movable-side end plate.

12. The scroll compressor according to claim 2 , wherein
the second discharge start point of the second compression chamber is set in a first half of the predetermined angular range during the eccentric rotational motion of the movable scroll.

13. The scroll compressor according to claim 2 , wherein
a flow path cross-sectional area of the oil relief passage is smaller than a flow path cross-sectional area of the oil inflow groove.

14. The scroll compressor according to claim 1 , wherein
the oil inflow groove is formed in an angular range of 180° or more in the circumferential direction with respect to a center of the fixed-side end plate or the movable-side end plate.

15. The scroll compressor according to claim 14 , wherein
the second discharge start point of the second compression chamber is set in a first half of the predetermined angular range during the eccentric rotational motion of the movable scroll.

16. The scroll compressor according to claim 14 , wherein
a flow path cross-sectional area of the oil relief passage is smaller than a flow path cross-sectional area of the oil inflow groove.

17. The scroll compressor according to claim 1 , wherein
the second discharge start point of the second compression chamber is set in a first half of the predetermined angular range during the eccentric rotational motion of the movable scroll.

18. The scroll compressor according to claim 17 , wherein
a flow path cross-sectional area of the oil relief passage is smaller than a flow path cross-sectional area of the oil inflow groove.

19. The scroll compressor according to claim 1 , wherein
a flow path

Assignees

• Daikin Ind Ltd

Inventors

• Nagahara Kenji

Classifications

• F04C2210/22

  gaseous, i.e. compressible · CPC title

• F04C27/005

  Axial sealings for working fluid · CPC title

• F04C29/028 Primary

  Means for improving or restricting lubricant flow · CPC title

• F04C23/008

  Hermetic pumps · CPC title

• F04C2210/14

  Lubricant · CPC title