IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0744439
(2008-11-26)
|
등록번호 |
US-8327661
(2012-12-11)
|
우선권정보 |
JP-2007-311689 (2007-11-30) |
국제출원번호 |
PCT/JP2008/071371
(2008-11-26)
|
§371/§102 date |
20100524
(20100524)
|
국제공개번호 |
WO2009/069611
(2009-06-04)
|
발명자
/ 주소 |
- Fujimoto, Shuji
- Yoshimi, Atsushi
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
10 |
초록
▼
A refrigeration apparatus uses a refrigerant that operates in a region including critical processes, and includes a compression mechanism having first and second compressors, a heat-source-side heat exchanger, an expansion mechanism, a utilization-side heat exchanger, an intercooler, and an intermed
A refrigeration apparatus uses a refrigerant that operates in a region including critical processes, and includes a compression mechanism having first and second compressors, a heat-source-side heat exchanger, an expansion mechanism, a utilization-side heat exchanger, an intercooler, and an intermediate refrigerant pipe. The first compressor has a first low-pressure compression element and a first high-pressure compression element to increase pressure of refrigerant more than the first low-pressure compression element. The second compressor has a second low-pressure compression element and a second high-pressure compression element to increase pressure of refrigerant more than the second low-pressure compression element. The intermediate refrigerant pipe causes refrigerant discharged by the first and second low-pressure compression elements to pass through the intercooler and be sucked into first and second high-pressure the compression elements. The intake sides of the first and second low-pressure compression elements are connected. The discharge sides of the first and second high-pressure compression elements merge.
대표청구항
▼
1. A refrigeration apparatus which uses a refrigerant that operates in a region including critical processes, the refrigeration apparatus comprising: a compression mechanism including a first compressor having a first low-pressure compression element configured and arranged to increase pressure of t
1. A refrigeration apparatus which uses a refrigerant that operates in a region including critical processes, the refrigeration apparatus comprising: a compression mechanism including a first compressor having a first low-pressure compression element configured and arranged to increase pressure of the refrigerant and a first high-pressure compression element configured and arranged to increase pressure of the refrigerant more than the first low-pressure compression element, anda second compressor having a second low-pressure compression element configured and arranged to increase pressure of the refrigerant and a second high-pressure compression element configured and arranged to increase pressure of the refrigerant more than the second low-pressure compression element;a heat-source-side heat exchanger configured and arranged to function as a heater or a cooler of the refrigerant;an expansion mechanism configured and arranged to decompress the refrigerant;a utilization-side heat exchanger configured and arranged to function as a heater or cooler of the refrigerant;an intercooler configured and arranged to cool the refrigerant that passes therethrough; andan intermediate refrigerant pipe configured and arranged to cause refrigerant discharged from the first low-pressure compression element and the refrigerant discharged from the second low-pressure compression element to be sucked into the first high-pressure compression element and the second high-pressure compression element via the intercooler,the intake side of the second low-pressure compression element and the intake side of the first low-pressure compression element being connected; andthe discharge side of the second high-pressure compression element and the discharge side of the first high-pressure compression element merging together. 2. The refrigeration apparatus according to claim 1, further comprising a merging circuit configured and arranged to merge and direct the refrigerant discharged from the first low-pressure compression element and the refrigerant discharged from the second low-pressure compression element to the intercooler; anda branching circuit configured and arranged to branch off and direct the refrigerant that has passed through the intercooler to the first high-pressure compression element and the second high-pressure compression element. 3. The refrigeration apparatus according to claim 1, further comprising a first intermediate refrigerant pipe configured and arranged to cause the refrigerant discharged from the first low-pressure compression element to pass through the intercooler and to be sucked into the first high-pressure compression element; anda second intermediate refrigerant pipe configured and arranged to cause the refrigerant discharged from the second low-pressure compression element to pass through the intercooler and to be sucked into the second high-pressure compression element. 4. The refrigeration apparatus according to claim 1, further comprising a first cross refrigerant pipe configured and arranged to cause the refrigerant discharged from the first low-pressure compression element to flow through the intercooler and to be sucked into the second high-pressure compression element; anda second cross refrigerant pipe configured and arranged to cause the refrigerant discharged from the second low-pressure compression element to flow through the intercooler and to be sucked into the first high-pressure compression element. 5. The refrigeration apparatus according to claim 1, wherein the first high-pressure compression element, the first low-pressure compression element, the second high-pressure compression element, and the second low-pressure compression element have rotating shafts that are rotatably driven to carry out compression work; andat least the rotating shaft of the first high-pressure compression element and the rotating shaft of the first low-pressure compression element are shared, orthe rotating shaft of the second high-pressure compression element and the rotating shaft of the second low-pressure compression element are shared. 6. The refrigeration apparatus according to claim 1, further comprising an injection pipe configured and arranged to branch off the refrigerant fed from the heat-source-side heat exchanger or the utilization-side heat exchanger to the expansion mechanism, andto direct the refrigerant to the first high-pressure compression element and/or the second high-pressure compression element. 7. The refrigeration apparatus according to claim 6, further comprising an economizer heat exchanger configured and arranged to carry out heat exchange between the refrigerant fed from the heat-source-side heat exchanger or the utilization-side heat exchanger to the expansion mechanism, andthe refrigerant that flows through the injection pipe. 8. The refrigeration apparatus according to claim 7, wherein the economizer heat exchanger has a conduit through which the refrigerant fed from the heat-source-side heat exchanger or the utilization-side heat exchanger to the expansion mechanism, andthe refrigerant that flows through the injection pipe flow in opposing directions. 9. The refrigeration apparatus according to claim 7, wherein the injection pipe is further configured and arranged so as to branch off the refrigerant fed from the heat-source-side heat exchanger or the utilization-side heat exchanger to the expansion mechanism before the refrigerant fed from the heat-source-side heat exchanger or the utilization-side heat exchanger to the expansion mechanism undergoes heat exchange in the economizer heat exchanger. 10. The refrigeration apparatus (1) according to claim 6, wherein the injection pipe is further configured and arranged so that the refrigerant fed from the heat-source-side heat exchanger or the utilization-side heat exchanger to the expansion mechanism is branched off and guided between the intercooler and the first high-pressure compression element and/orthe second high-pressure compression element. 11. The refrigeration apparatus according to claim 1, wherein the intercooler is a single intercooler that is part of the compression mechanism having the first compressor and the second compressor. 12. The refrigeration apparatus according to claim 1, further comprising a switching mechanism is further configured and arranged to switch between a cooling operation state in which the refrigerant is circulated through the compression mechanism, the heat-source-side heat exchanger, the expansion mechanism, and the utilization-side heat exchanger in sequence, anda heating operation state in which the refrigerant is circulated through the compression mechanism, the utilization-side heat exchanger, the expansion mechanism, and the heat-source-side heat exchanger in sequence; andintermediate cooling function-switching element configured and arranged to cause the intercooler to function as a cooler when the switching mechanism is in the cooling operation state, andto not allow the intercooler to function as a cooler when the switching mechanism in the heating operation state. 13. The refrigeration apparatus according to claim 1, wherein the refrigerant that operates in the region including critical processes is carbon dioxide. 14. The refrigeration apparatus according to claim 2, wherein the first high-pressure compression element, the first low-pressure compression element, the second high-pressure compression element, and the second low-pressure compression element have rotating shafts that are rotatably driven to carry out compression work; andat least the rotating shaft of the first high-pressure compression element and the rotating shaft of the first low-pressure compression element are shared, orthe rotating shaft of the second high-pressure compression element and the rotating shaft of the second low-pressure compression element are shared. 15. The refrigeration apparatus according to claim 2, further comprising an injection pipe configured and arranged to branch off the refrigerant fed from the heat-source-side heat exchanger or the utilization-side heat exchanger to the expansion mechanism, andto direct the refrigerant to the first high-pressure compression element and/or the second high-pressure compression element. 16. The refrigeration apparatus according to claim 3, wherein the first high-pressure compression element, the first low-pressure compression element, the second high-pressure compression element, and the second low-pressure compression element have rotating shafts that are rotatably driven to carry out compression work; andat least the rotating shaft of the first high-pressure compression element and the rotating shaft of the first low-pressure compression element are shared, orthe rotating shaft of the second high-pressure compression element and the rotating shaft of the second low-pressure compression element are shared. 17. The refrigeration apparatus according to claim 3, further comprising an injection pipe configured and arranged to branch off the refrigerant fed from the heat-source-side heat exchanger or the utilization-side heat exchanger to the expansion mechanism, andto direct the refrigerant to the first high-pressure compression element and/or the second high-pressure compression element. 18. The refrigeration apparatus according to claim 4, wherein the first high-pressure compression element, the first low-pressure compression element, the second high-pressure compression element, and the second low-pressure compression element have rotating shafts that are rotatably driven to carry out compression work; andat least the rotating shaft of the first high-pressure compression element and the rotating shaft of the first low-pressure compression element are shared, orthe rotating shaft of the second high-pressure compression element and the rotating shaft of the second low-pressure compression element are shared. 19. The refrigeration apparatus according to claim 4, further comprising an injection pipe configured and arranged to branch off the refrigerant fed from the heat-source-side heat exchanger or the utilization-side heat exchanger to the expansion mechanism, andto direct the refrigerant to the first high-pressure compression element and/or the second high-pressure compression element. 20. The refrigeration apparatus according to claim 5, further comprising an injection pipe configured and arranged to branch off the refrigerant fed from the heat-source-side heat exchanger or the utilization-side heat exchanger to the expansion mechanism, andto direct the refrigerant to the first high-pressure compression element and/or the second high-pressure compression element.
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