Internal intermediate pressure multistage compression type rotary compressor, manufacturing method thereof and displacement ratio setting method

• US 20040001762A1
• Filed: 06/05/2003
• Published: 01/01/2004
• Est. Priority Date: 06/05/2002
• Status: Active Grant

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Sato, Kazuya, Yamasaki, Haruhisa, Tadano, Masaya, Sugawara, Akira, Matumoto, Kenzo, Sato, Takashi, Imai, Satoshi
• Granted Patent: US 7,131,821 B2
• Time in Patent Office: Days
• US Class Current: 417/244
• CPC Class Codes: F01C 21/0863 the fluid being the working fluid
• CPC Class Codes: F01C 21/10 Outer members for co-operation with rotary pistons; Casings casings for rotary engines or machines in general F16M
• CPC Class Codes: F04C 18/356 with vanes reciprocating with respect to the outer member
• CPC Class Codes: F04C 2250/101 of the inlet
• CPC Class Codes: F04C 2270/21 Pressure difference
• CPC Class Codes: F04C 23/001 of similar working principle
• CPC Class Codes: F04C 23/008 Hermetic pumps
• CPC Class Codes: F04C 29/0092 Removing solid or liquid contaminants from the gas under pumping, e.g. by filtering or deposition; Purging; Scrubbing; Cleaning
• CPC Class Codes: F04C 29/02 Lubrication of machines or engines in general F01M; Lubricant separation separation in general B01D
• CPC Class Codes: F04C 29/023 Lubricant distribution through a hollow driving shaft F04C29/025 takes precedence
• CPC Class Codes: F04C 29/028 Means for improving or restricting lubricant flow
• CPC Class Codes: F04C 29/045 of the electric motor in hermetic pumps

Abstract

There is provided an internal intermediate pressure multistage compression type rotary compressor capable of reducing a height dimension while reducing the amount of oil to be discharged outside. An electric element and first and second rotary compression elements which are driven by a rotary shaft of the electric element disposed under the electric element are provided in a hermetic shell case. There is provided a refrigerant introduction pipe for introducing refrigerant in the hermetic shell case over the electric element into the second rotary compression element through an outside of the hermetic shell case. There is provided an oil path provided in the rotary shaft for discharging oil through an oil discharge port which is positioned at the upper end of the rotary shaft. The refrigerant introduction pipe is provided such that a part of an inlet of the refrigerant introduction pipe is positioned under the upper end of a stator of the electric element.

Claims

1. An internal intermediate pressure multistage compression type rotary compressor comprising an electric element in a hermetic shell case, and first and second rotary compression elements being positioned under the electric element and driven by a rotary shaft of the electric element, wherein refrigerant compressed by said first rotary compression element is discharged into the hermetic shell case, and the discharged intermediate pressure refrigerant is compressed by said second rotary compression element:

said multistage compression type rotary compressor further comprising a refrigerant introduction pipe which is opened to the interior of the hermetic shell case over the electric element and introduces the refrigerant in the hermetic shell case into the second rotary compression element through an outside of the hermetic shell case, wherein a part of an inlet of the refrigerant introduction pipe is positioned under the upper end of a stator of the electric element.

2. The internal intermediate pressure multistage compression type rotary compressor according to claim 1, wherein an oil path is formed in the rotary shaft, and an adjusting means for adjusting an inner diameter of an oil discharge port of the oil path.

3. An internal intermediate pressure multistage compression type rotary compressor comprising an electric element in a hermetic shell case, and first and second rotary compression elements being positioned under the electric element and driven by a rotary shaft of the electric element, wherein refrigerant compressed by said first rotary compression element is discharged into the hermetic shell case, and the discharged intermediate pressure refrigerant is compressed by said second rotary compression element:

and

said multistage compression type rotary compressor further comprising a refrigerant introduction pipe for introducing the refrigerant in the hermetic shell case over the electric element into the second rotary compression element through an outside of the hermetic shell case, and a notch communicating with an interior of the hermetic shell case being formed on the side surface of a stator of the electric element, and an inlet of the refrigerant introduction pipe is allowed to correspond to a notch of the stator.

4. The internal intermediate pressure multistage compression type rotary compressor according to claim 3, wherein the notch of the stator is opened to the interior of the hermetic shell case over the electric element at the upper end thereof, and closed at the lower end thereof.

5. The internal intermediate pressure multistage compression type rotary compressor according to claim 3 or claim 4, wherein an oil path is formed in the rotary shaft, and an adjusting means for adjusting an inner diameter of an oil discharge port of the oil path.

6. An internal intermediate pressure multistage compression type rotary compressor comprising an electric element in a hermetic shell case, and first and second rotary compression elements being positioned under the electric element and driven by a rotary shaft of the electric element, wherein refrigerant compressed by said first rotary compression element is discharged into the hermetic shell case, and the discharged intermediate pressure refrigerant is compressed by said second rotary compression element:

said multistage compression type rotary compressor further comprising a refrigerant introduction pipe for introducing the refrigerant in the hermetic shell case over the electric element into the second rotary compression element;

an oil path formed in the rotary shaft for discharging oil through an oil discharge port positioned at the upper end of the rotary shaft; and

an adjusting means for adjusting an inner diameter of the oil discharge port of the oil path.

7. A method of manufacturing a rotary compressor comprising an electric element in a hermetic shell case, and first and second rotary compression elements being positioned under the electric element and driven by a rotary shaft of the electric element, wherein refrigerant compressed by said first rotary compression element is discharged into the hermetic shell case, and the discharged intermediate pressure refrigerant is compressed by said second rotary compression element:

said method comprising introducing the refrigerant in the hermetic shell case over the electric element into the second rotary compression element;

discharging oil through an oil discharge port positioned at the upper end of the rotary shaft while an oil path is formed in the rotary shaft; and

adjusting the amount of discharge of the oil by adjusting an inner diameter of the oil discharge port of the oil path.

8. An internal intermediate pressure multistage compression type rotary compressor comprising an electric element in a hermetic shell case, and first and second rotary compression elements being driven by the electric element, wherein refrigerant compressed by said first rotary compression element is discharged into the hermetic shell case, and the discharged intermediate pressure refrigerant is compressed by said second rotary compression element:

said multistage compression type rotary compressor further comprising a refrigerant introduction pipe for introducing the refrigerant in the hermetic shell case into the second rotary compression element;

a filtering means provided at the inlet of the refrigerant introduction pipe.

9. An internal intermediate pressure multistage compression type rotary compressor comprising an electric element in a hermetic shell case, and first and second rotary compression elements being driven by the electric element, wherein refrigerant compressed by said first rotary compression element is discharged into the hermetic shell case, and the discharged intermediate pressure refrigerant is compressed by said second rotary compression element:

said multistage compression type rotary compressor further comprising a refrigerant introduction pipe for introducing the refrigerant in the hermetic shell case into the second rotary compression element; and

a filtering means provided at an outlet of the refrigerant introduction pipe.

10. An internal intermediate pressure multistage compression type rotary compressor comprising an electric element in a hermetic shell case, and first and second rotary compression elements being driven by the electric element, wherein refrigerant compressed by said first rotary compression element is discharged into the hermetic shell case, and the discharged intermediate pressure refrigerant is compressed by said second rotary compression element:

said multistage compression type rotary compressor further comprising a refrigerant introduction pipe for introducing the refrigerant in the hermetic shell case into the second rotary compression element;

a filtering means provided in the refrigerant introduction pipe.

11. An internal intermediate pressure multistage compression type rotary compressor comprising an electric element in a hermetic shell case, and first and second rotary compression elements being driven by the electric element, wherein refrigerant compressed by said first rotary compression element is compressed by the said second rotary compression element:

wherein the refrigerant compressed by the second rotary compression element is discharged into the hermetic shell case, and a high pressure refrigerant in the hermetic shell case is discharged outside.

13. The internal intermediate pressure multistage compression type rotary compressor according to claims 11 and 12 comprising a refrigerant introduction pipe for introducing refrigerant discharged from the first rotary compression element into the second rotary compression element through an outside of the hermetic shell case.

14. The internal intermediate pressure multistage compression type rotary compressor according to claim 11, 12 or 13 wherein the first and second rotary compression elements are disposed under the electric element, and the first rotary compression element is disposed under the second rotary compression element, wherein the refrigerant in the hermetic shell case is discharged outside from the space over the electric element.

15. The internal intermediate pressure multistage compression type rotary compressor according to claim 11, 12 or 13 wherein carbon dioxide is used as the refrigerant.

12. An internal intermediate pressure multistage compression type rotary compressor comprising an electric element in a hermetic shell case, and first and second rotary compression elements being driven by the electric element, wherein refrigerant compressed by said first rotary compression element is compressed by the said second rotary compression element:

said internal intermediate pressure multistage compression type rotary compressor further comprising an upper cylinder constituting the first rotary compression element and an upper roller eccentrically rotating in said upper cylinder;

a vane being brought into contact with the upper roller for partitioning the interior of the upper cylinder into a high pressure chamber HR and a low pressure chamber LR; and

a back pressure chamber formed in the upper cylinder for applying a back pressure to the vane;

wherein the refrigerant compressed by the second rotary compression element is discharged into the hermetic shell case, and a high pressure refrigerant in the hermetic shell case is discharged outside, and an outlet of the first rotary compression element is allowed to communicate with the back pressure chamber.

16. An internal intermediate pressure multistage compression type rotary compressor comprising an electric element in a hermetic shell case, and first and second rotary compression elements being driven by the electric element, wherein refrigerant which is compressed by the first rotary compression element and discharged is sucked in, compressed by and discharged into the second rotary compression element:

and

wherein an upper cylinder constituting the second rotary compression element is expanded outward from a suction port to an extent of a predetermined angle in a direction of rotation of an upper roller.

17. An internal intermediate pressure multistage compression type rotary compressor comprising an electric element in a hermetic shell case, and first and second rotary compression elements being driven by the electric element, wherein refrigerant which is compressed by the first rotary compression element and discharged is sucked in, compressed by and discharged into the second rotary compression element;

and

wherein an upper cylinder constituting the second rotary compression element is expanded outward from a suction port to an extent of a predetermined angle in a direction of rotation of an upper roller from a suction port, and wherein a ratio of the displacement of the first rotary compression element relative to that of the second rotary compression element is set by adjusting an angle for starting compression by the second rotary compression element.