Sealed Scroll Compressor for Helium

• US 20120294748A1
• Filed: 05/16/2012
• Published: 11/22/2012
• Est. Priority Date: 05/17/2011
• Status: Abandoned Application

• Current Assignee: Hitachi-Johnson Controls Air Conditioning Incorporated (Johnson Controls International plc)
• Original Assignee: Hitachi Appliances Incorporated (Hitachi, Ltd.)
• Inventors: Shiibayashi, Masao, Izunaga, Yasushi, Adachi, Takamasa
• Application Number:
  US13/473,331
• Publication Number:
  US 20120294748A1
• Time in Patent Office: Days
• US Class Current: 418/55.1
• CPC Class Codes: F04C 18/0215 where only one member is moving
• CPC Class Codes: F04C 18/0261 Details of the ports, e.g. location, number, geometry
• CPC Class Codes: F04C 2210/105 Helium (He)
• CPC Class Codes: F04C 2240/806 Pipes for fluids; Fittings therefor
• CPC Class Codes: F04C 23/008 Hermetic pumps
• CPC Class Codes: F04C 29/0007 Injection of a fluid in the working chamber for sealing, cooling and lubricating sealing only F04C27/00; lubrication only F04C29/02; cooling F02B47/02, F02D21/00, F02M25/00

Abstract

A sealed scroll compressor for helium having a stationary scroll, an orbiting scroll, and an oil-injection mechanism. The oil-injection mechanism has an oil-injection pipe arranged to pass through a sealed container and connected to an oil-injection port, and the opening of the oil-injection port is arranged at a bottom surface of a groove between ridges formed with the scroll wrap of the stationary scroll in such a manner that a first range of the orbital angle of the orbiting scroll is approximately identical to a second range of the orbital angle of the orbiting scroll, where the oil-injection port is connected to the outer compression chamber while the orbital angle of the orbiting scroll is in the first range, and is connected to the inner compression chamber while the orbital angle of the orbiting scroll is in the second range.

Claims

1. A sealed scroll compressor for helium, comprising:

a sealed container;

a stationary scroll being contained in the sealed container and having an end plate and a scroll wrap;

an oil-injection port having an opening and being arranged in the end plate of the stationary scroll;

an oil-injection mechanism having an oil-injection pipe which is arranged to pass through the sealed container and connected to the oil-injection port; and

an orbiting scroll contained in the sealed container and interleaved with the stationary scroll to form an outer compression chamber and an inner compression chamber which realize an asymmetric-wrap type compression chambers;

wherein the opening of the oil-injection port is arranged at a bottom surface of a groove between ridges formed with the scroll wrap of the stationary scroll in such a manner that a first range of an orbital angle of the orbiting scroll is approximately identical to a second range of the orbital angle of the orbiting scroll, and the oil-injection port is connected to the outer compression chamber while the orbital angle of the orbiting scroll is in the first range, and is connected to the inner compression chamber while the orbital angle of the orbiting scroll is in the second range.

2. The sealed scroll compressor according to claim 1, wherein a center of the opening is displaced outward from a center of the bottom surface.

3. The sealed scroll compressor according to claim 1, wherein the opening has a shape elongated in a radial direction of the stationary scroll.

4. The sealed scroll compressor according to claim 1, wherein each of the first range and the second range has a width of approximately 200 to 230 degrees.

5. The sealed scroll compressor according to claim 1, wherein a center of the opening is located at a position displaced from an end of the scroll wrap of the stationary scroll toward an inner end of the scroll wrap of the stationary scroll along the scroll wrap of the stationary scroll by a scroll wrap angle of approximately 1.5 π

to 2 π

rad, where it is the circle ratio.

6. A sealed scroll compressor for helium, comprising:

a sealed container;

a stationary scroll being contained in the sealed container and having an end plate and a scroll wrap;

an oil-injection port having an opening and being arranged in the end plate of the stationary scroll;

an oil-injection mechanism having an oil-injection pipe which is arranged to pass through the sealed container and connected to the oil-injection port; and

an orbiting scroll contained in the sealed container and interleaved with the stationary scroll to form an outer compression chamber and an inner compression chamber which realize an asymmetric-wrap type compression chambers;

wherein the opening of the oil-injection port is arranged at a bottom surface of a groove between ridges formed with the wrap of the stationary scroll in such a manner that a first range θ

₁ of an orbital angle of the orbiting scroll, a second range θ

₂ of the orbital angle of the orbiting scroll, a first stroke volume Vth1 in the outer compression chamber, and a second stroke volume Vth2 in the inner compression chamber satisfy a relationship,

θ

₁/θ

₂≈

Vth1/Vth2.

7. The sealed scroll compressor according to claim 6, wherein a center of the opening is displaced outward from a center of the bottom surface.

8. The sealed scroll compressor according to claim 6, wherein the opening has a shape elongated in a radial direction of the stationary scroll.

9. The sealed scroll compressor according to claim 6, wherein a center of the opening is located at a position displaced from an end of the scroll wrap of the stationary scroll toward an inner end of the scroll wrap of the stationary scroll along the scroll wrap of the stationary scroll by a scroll wrap angle of approximately 1.5 π

to 2 π

rad, where n is the circle ratio.