Claims
- 1. A multi-stage capacity-controlled scroll compressor comprising:a casing; a compression portion having a first scroll and a second scroll and arranged in the casing such that a fluid working chamber is defined between the first and second scrolls; a discharge chamber formed between the compression portion and an inner surface of the casing; a first bypass passage communicating a port that is formed in the fluid working chamber between a low-pressure port at one end of the fluid working chamber and a high-pressure port at the other end of the fluid working chamber with the low-pressure port; a first opening/closing means for opening and closing the first bypass passage; a second bypass passage provided within said casing for communicating the discharge chamber with a suction-side chamber communicating with the low-pressure port; a second opening/closing means for opening and closing the second bypass passage.
- 2. The multi-stage capacity-controlled scroll compressor according to claim 1, whereina first scroll and a second scroll of which the compression chamber is formed show asymmetrical spiral shapes, respectively, that a spiral end of one scroll is 180 degree longer in involute angle than a spiral end of the other scroll.
- 3. The multi-stage capacity-controlled scroll compressor according to claim 1, whereinthe second opening/closing means operates on a differential pressure between a pilot pressure and a pressure in the suction-side chamber or a pressure in the discharge chamber.
- 4. The multi-stage capacity-controlled scroll compressor according to claim 1, further comprisinga liquid injection tube for cooling a low-pressure chamber communicating with the low-pressure port.
- 5. The multi-stage capacity-controlled scroll compressor according to claim 1, whereinthe first opening/closing means and the second opening/closing means operate on a pilot pressure, and a pilot port of the first opening/closing means and a pilot port of the second opening/closing means are connected to their corresponding pilot lines, respectively, via one joint fitting provided at an upper center of the compressor body.
- 6. A multi-stage capacity-controlled scroll compressor comprising:the multi-stage capacity-controlled scroll compressor as defined in claim 1, and a standard scroll compressor of a specified discharge capacity, wherein the multi-stage capacity-controlled scroll compressor and the standard scroll compressor are connected to each other in parallel.
- 7. The multi-stage capacity-controlled scroll compressor according to claim 1, whereinthe first opening/closing means operates on a pilot pressure, and a pilot port of the first opening/closing means and joint fittings for connecting a pilot port are connected to each other by screws.
- 8. A multi-stage capacity-controlled scroll compressor comprising:a casing; a compression portion having a first scroll and a second scroll and arranged in the casing such that a fluid working chamber is defined between the first and second scrolls; a discharge chamber formed between the compression portion and an inner surface of the casing; a first bypass passage communicating a port that is formed in the fluid working chamber between a low-pressure port at one end of the fluid working chamber and a high-pressure port at the other end of the fluid working chamber with the low-pressure port; a first opening/closing means for opening and closing the first bypass passage; including a bypass valve in said first bypass passage and a valve controller providing operating pressure to said bypass valve; a second bypass passage provided outside of the casing and separate from said valve controller for communicating the discharge chamber with a suction-side chamber communicating with the low-pressure port; a second opening/closing means for opening and closing the second bypass passage.
- 9. The multi-stage capacity-controlled scroll compressor according to claim 8, whereinthe second bypass passage and the second opening/closing means are provided each in a plural number.
- 10. The multi-stage capacity-controlled scroll compressor according to claim 8, whereinthe second opening/closing means for opening and closing the second bypass passage is a motor-operated valve which is controllable to any arbitrary degree of openness.
- 11. The multi-stage capacity-controlled scroll compressor according to claim 8, wherein said valve controller and said second bypass passage are connected in parallel between a suction-side line and a high-pressure line.
Priority Claims (1)
Number |
Date |
Country |
Kind |
10-165022 |
Jun 1998 |
JP |
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Parent Case Info
This application is a continuation of application Ser. No. 09/462,207, filed on Jan. 4, 2000, now abandoned and for which priority is claimed under 35 U.S.C. § 120. Application Ser. No. 09/462,207 is the national phase of PCT International Application No. PCT/JP99/02761 filed on May 26, 1999 under 35 U.S.C. § 371. The entire contents of each of the above-identified applications are hereby incorporated by reference. This application also claims priority of Application No. 10-165022 filed in Japan on Jun. 12, 1998 under 35 U.S.C. § 119 the entirety of which is hereby incorporated by reference.
US Referenced Citations (18)
Foreign Referenced Citations (4)
Number |
Date |
Country |
A979152 |
Mar 1997 |
JP |
A9170573 |
Jun 1997 |
JP |
PCT9902761 |
May 1999 |
JP |
WO9964744 |
May 1999 |
WO |
Continuations (1)
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Number |
Date |
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Parent |
09/462207 |
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US |
Child |
10/052530 |
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US |