[특허]Centrifugal refrigerant vapour compressors

Venus Systems Limited

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Centrifugal refrigerant vapour compressors

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F04D-025/06 F25B-001/10 F04D-029/057 F25B-001/053 F25B-029/00 F25B-031/00 F16C-033/10 F04D-029/063 F04C-018/02 F04D-017/12 F04D-027/00 F25B-001/00 F25B-049/02 F04D-029/58 G05D-023/19 F04D-029/051 F04D-029/053 F04D-029/28 F04D-029/46 F25B-043/00 G05B-013/02 F24F-011/30 F24F-011/62 F24F-011/63 F24F-011/46
출원번호	US-0591846 (2017-05-10)
등록번호	US-10047976 (2018-08-14)
우선권정보	GB-1122142.1 (2011-12-21)
발명자 / 주소	Creamer, Michael
출원인 / 주소	Venus Systems Limited
대리인 / 주소	Seed Intellectual Property Law Group LLP
인용정보	피인용 횟수 : 0 인용 특허 : 3

초록
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A centrifugal compressor for compressing a refrigerant vapor in a refrigeration cycle. The compressor comprises an impeller drive shaft supported by first and second radial bearings for rotation within the compressor housing and an impeller assembly including at least one centrifugal impeller wheel mounted on the impeller drive shaft to rotate with the impeller drive shaft. The first and second radial bearings are hydrodynamic fluid bearings in which the bearing fluid is the refrigerant vapor. The compressor further comprises a conduit for supplying a po...

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1. A centrifugal compressor for compressing a refrigerant vapour in a refrigeration cycle, the compressor comprising: an impeller drive shaft supported by first and second radial bearings for rotation within the compressor housing; andan impeller assembly including at least one centrifugal impeller wheel mounted on the impeller drive shaft to rotate with the impeller drive shaft;wherein the first and second radial bearings are hydrodynamic fluid bearings in which the bearing fluid is the refrigerant vapour, the compressor further comprising a conduit for supplying a portion of the refrigerant vapour from the impeller assembly to the first and second fluid bearings,an external supply of pressurised vapour comprising a refrigerant pressurisation vessel that is adapted to capture and store pressurised refrigerant vapour from the compressor or a refrigeration system of which the compressor is a part when the compressor is running at normal operating speeds. 2. The centrifugal compressor according to claim 1, comprising: a refrigerant vapour feed taken from two or more regions of the impeller wheel or wheels of the impeller assembly, including a relatively low pressure region and a relatively high pressure region; andwherein the compressor further comprises a valve arrangement for selectively connecting either the higher pressure region or the lower pressure region of the impeller wheel(s) to the conduit that supplies refrigerant vapour to the radial bearings. 3. The centrifugal compressor according to claim 1, wherein the external supply of pressurised refrigerant vapour that is independent of the operation of the compressor and is adapted to be connected to the bearings to supply pressurised refrigerant vapour to the bearings at low speeds to float the bearings. 4. The centrifugal vapour compressor according to claim 3, comprising a sensor for detecting whether or not the bearings are floated. 5. The centrifugal vapour compressor according to claim 4, wherein the sensor is a sensor to detect reverse rotation of the impeller drive shaft. 6. The centrifugal compressor according to claim 1, wherein the bearings are mounted to the compressor housing by resilient supports. 7. The centrifugal compressor according to claim 6, wherein the resilient supports are resilient diaphragms or O-rings. 8. The centrifugal compressor according to claim 1, further comprising a thrust bearing. 9. The centrifugal compressor according to claim 8, wherein the thrust bearing is a fluid bearing in which the fluid is the refrigerant vapour itself. 10. The centrifugal compressor according to claim 9, wherein the thrust bearings are from the group comprising: hydrostatic and hydrodynamic and a hybrid combination of hydrostatic and hydrodynamic, adapted to receive a supply of pressurised refrigerant vapour from the impeller assembly of the compressor. 11. The centrifugal compressor according to claim 10, wherein the supply of pressurised refrigerant is taken from the same region of the impeller arrangement as that for the radial bearings. 12. The centrifugal compressor according to claim 10, wherein the supply of pressurised refrigerant is taken from a different region of the impeller arrangement as that for the radial bearings. 13. The centrifugal compressor according to claim 1, wherein the compressor is a multi-stage compressor, comprising a plurality of impellers through which the refrigerant vapour flows in series. 14. The centrifugal compressor according to claim 13, wherein at least two of the impellers are oppositely oriented to one another in an axial direction, either with their bladed sides facing one another or their rear sides facing one another. 15. The centrifugal compressor according to claim 13, wherein the impellers are arranged at either end of the impeller drive shaft. 16. The centrifugal compressor according to claim 1, configured to operate with the impeller drive shaft oriented substantially vertically. 17. The centrifugal compressor according to claim 16, wherein the impeller wheel or wheels are arranged on the impeller drive shaft so that the net force resulting from the pressure difference(s) across the impeller wheel(s) acts to lift the impeller and shaft/motor assembly upwards. 18. The compressor according to claim 1, wherein the compressor is driven by a permanent magnet electric motor. 19. The compressor according to claim 1, wherein the compressor is driven by an induction motor. 20. The compressor according to claim 18, wherein the motor is mounted within the compressor housing. 21. The compressor according to claim 20, wherein the motor is cooled by a portion of the flow of refrigerant vapour from the compressor. 22. The compressor according to claim 20, wherein the motor stator is flash cooled by a liquid refrigerant feed. 23. The compressor according to claim 18, wherein the motor is controlled by an inverter mounted on the compressor housing. 24. The compressor according to claim 1, comprising variable inlet guide vanes at the inlet to the impeller or in multi-stage compressors at the inlet of one or more of the impeller compression stages. 25. A centrifugal compressor for compressing a refrigerant vapour in a refrigeration cycle, the compressor comprising: an impeller drive shaft supported by first and second radial bearings for rotation within the compressor housing, wherein the first and second radial bearings are hydrodynamic fluid bearings in which the bearing fluid is the refrigerant vapour;an impeller assembly including at least one centrifugal impeller wheel mounted on the impeller drive shaft to rotate with the impeller drive shaft; andan external supply of pressurised refrigerant vapour that is independent of the operation of the compressor and is adapted to be connected to the bearings to supply pressurised refrigerant vapour to the bearings, wherein the external supply of pressurised vapour comprises a refrigerant pressurisation vessel that is adapted to capture and store pressurised refrigerant vapour from the compressor or a refrigeration system of which the compressor is a part when the compressor is running at normal operating speeds. 26. The centrifugal compressor according to claim 25, wherein the external supply of pressurised vapour comprises a refrigerant pressurisation vessel that is adapted to capture and store pressurised refrigerant vapour from the compressor or a refrigeration system of which the compressor is a part when the compressor is running at normal operating speeds. 27. The compressor system, comprising a compressor according to claim 1 and a control system to monitor, control and protect the compressor. 28. The compressor system, comprising a plurality of compressors according to claim 1 serving a single refrigeration circuit and a control system to monitor, control and protect the compressors. 29. The compressor system according to claim 27, wherein the control system maintains an event history. 30. A refrigeration circuit comprising the one or more compressors according to claim 1 and a control system to monitor, control, and protect the compressor. 31. A chilled water system comprising the refrigeration circuit according to claim 30. 32. A Direction Expansion (DX) refrigeration system, comprising the refrigeration circuit according to claim 30 serving one or more evaporators. 33. An industrial process cooling system, comprising the refrigeration circuit according to claim 30. 34. A building air conditioning system, comprising the Chilled Water System or DX System according to claim 30.

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Centrifugal refrigerant vapour compressors

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Centrifugal refrigerant vapour compressors

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