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Electrically driven compressors and methods for circulating lubrication oil through the same

Imported: 24 Feb '17 | Published: 06 Jan '04

Hiroyuki Gennami, Kazuhiro Kuroki, Ken Suitou, Naohiro Nakajima, Shinji Tsubai, Kazuya Kimura

USPTO - Utility Patents

Abstract

An oil storage area (

45

a) is defined on the bottom of a motor chamber (

45) of a scroll compressor (

1). An oil transfer route (

4

a) is defined in the portion of a center housing (

4) that corresponds to the storage area (

45

a). Lubricating oil L is separated from the discharged, compressed refrigerant by an oil separator (

80) and the lubricating oil L is supplied to the backside of a movable scroll (

20) due to a pressure differential within the compress (

1). After lubricating a bearing (

10), the lubricating oil L is temporarily stored in the storage area (

45

a) and then is transferred due to a pressure differential to the suction-side of a compression mechanism (

21) via the oil transfer route (

4

a). The lubricating oil L is then transferred to the oil separator (

80) together with the compressed refrigerant that is discharged from a compression chamber (

32) of the compression mechanism (

21). Thus, the lubricating oil L contained in the discharged, compressed refrigerant can be effectively separated from the compressed refrigerant and circulated to and from the back side of the movable scroll (

20) in order to lubricate moving parts within the compressor (

1) using the pressure differentials within the compressor (

1).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a vertical cross-sectional diagram of a representative scroll compressor.

FIG. 2 is a perspective diagram taken along line II—II in FIG.

1.

FIGS. 3 and 4 are partial cross-sectional diagrams illustrating the relative positions between the first and second oil routes at different rotational positions of a movable scroll.

Claims

1. An electrically driven compressor comprising:

2. A method for circulating lubricating oil through the electric compressor having a compression mechanism arranged and constructed to draw in a refrigerant, compress and highly pressurize the refrigerant, and then discharge the pressurized refrigerant, the compression mechanism comprising a drive shaft and a bearing rotatably supporting the drive shaft, wherein a refrigerant flow channel is defined between a suction side of the compression mechanism and a discharge side of the compression mechanism, comprising:

3. An electrically driven compressor comprising:

4. An electrically driven compressor as in claim 3, wherein the lubricating oil route has a first end and a second end that respectively communicate with the discharge-side region and the suction-side region of the compression mechanism, wherein the lubricating oil route is arranged and constructed so that the lubrication oil flows from the discharge-side region to the suction-side region via the bearing due to a difference in pressure between the discharge-side region and an area proximal to the bearing and difference in pressure between the area proximal to the bearing and the suction-side region.

5. An electrically driven compressor as in claim 4, wherein:

6. An electrically driven compressor as in claim 4, further including an oil separator communicating with the discharge-side region of the compression mechanism, the oil separator being arranged and constructed to separate the lubricating oil from compressed refrigerant that has been discharged from the compression mechanism.

7. An electrically driven compressor as in claim 4, further including an oil storage area defined proximal to the bearing, the oil storage area being arranged and constructed to store lubricating oil that lubricated the bearing before the stored lubricating oil is transferred to the suction-side region of the compression mechanism.

8. A method for circulating lubricating oil within an electrically driven compressor, the compressor having a compression mechanism that is driven by a drive shaft, an electric motor rotatably driving the drive shaft, and a bearing rotatably supporting the drive shaft, the method comprising:

9. A method as in claim 8, wherein the pressure differential along the lubricating oil route is generated due to refrigerant that is compressed by the compression mechanism.

10. A method as in claim 9, wherein a first end of the lubricating oil route communicates with the discharge port and the second end of the lubricating oil route communicates with the suction port.

11. A method as in claim 10, further including separating the lubricating oil from compressed refrigerant that has been discharged from the compression mechanism.

12. A method as in claim 10, further including storing the lubricating oil that lubricated the bearing before the stored lubricating oil is transferred to the suction-side region.

13. A method for circulating lubricating oil within an electrically driven compressor, comprising:

14. A method as in claim 13, further comprising temporarily storing the lubricating oil separated from the compressed refrigerant before transferring the separated lubricating oil to the bearing.

15. An electrically driven compressor, comprising:

16. An electrically driven compressor as in claim 15, further comprising means for temporarily storing the lubricating oil separated from the compressed refrigerant before transferring the separated lubricating oil to the bearing.