IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0745593
(2008-12-30)
|
등록번호 |
US-8424339
(2013-04-23)
|
국제출원번호 |
PCT/US2008/088520
(2008-12-30)
|
§371/§102 date |
20100601
(20100601)
|
국제공개번호 |
WO2009/088846
(2009-07-16)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- Johnson Controls Technology Company
|
대리인 / 주소 |
McNees Wallace & Nurick LLC
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
9 |
초록
▼
A motor coolant method and system is used to cool a compressor motor (36) in a refrigeration system having a multi-stage compressor (38). The compressor includes a first compressor stage (42) and a second compressor stage (44), the first compressor stage providing compressed refrigerant to an input
A motor coolant method and system is used to cool a compressor motor (36) in a refrigeration system having a multi-stage compressor (38). The compressor includes a first compressor stage (42) and a second compressor stage (44), the first compressor stage providing compressed refrigerant to an input of the second compressor stage. The motor coolant system has a first connection with the refrigerant loop to receive refrigerant into the motor cavity for cooling, the received refrigerant provided from a system component having a high pressure, and a second connection with the refrigerant loop to return refrigerant to an intermediate pressure greater than an evaporator operating pressure. The pressure inside the motor cavity may be approximately the pressure within the first stage discharge and second stage suction to minimized seal leakage between the motor cavity and the internal pressures of the first and second stage compressors.
대표청구항
▼
1. A vapor compression system comprising: a compressor, an evaporator and a condenser connected in a closed loop;a motor connected to the compressor to power the compressor;a motor coolant system configured to cool the compressor motor;the compressor comprising: a first compressor stage and a second
1. A vapor compression system comprising: a compressor, an evaporator and a condenser connected in a closed loop;a motor connected to the compressor to power the compressor;a motor coolant system configured to cool the compressor motor;the compressor comprising: a first compressor stage and a second compressor stage, the first compressor stage providing compressed vapor to an input of the second compressor stage;the motor coolant system comprising: a first connection in fluid communication with the condenser to deliver refrigerant into a motor cavity, and a second connection with the refrigerant loop to return refrigerant to an interstage connection having an intermediate pressure, the intermediate pressure greater than an evaporator operating pressure and less than a condenser operating pressure; anda first seal located between the motor cavity and the first compressor stage, and a second seal located between the motor cavity and the second compressor stage, the first and second seal configured to maintain the refrigerant at an intermediate pressure inside the motor cavity. 2. The system of claim 1, wherein the first connection receives the refrigerant from the condenser at a pressure greater than the intermediate pressure. 3. The system of claim 1, wherein the intermediate pressure is approximately equal to a first compressor stage discharge pressure, a second compressor stage suction pressure, or an economizer operating pressure. 4. The system of claim 1, wherein the motor is positioned between the first compressor stage and the second compressor stage. 5. The system of claim 4, wherein the refrigerant from the condenser provides a high pressure vapor exceeding an evaporator vapor pressure to reduce a differential pressure across the first and second seal to cool motor cavity to reduce system losses and to reduce leakage of refrigerant between the motor cavity and the second compressor stage. 6. The system of claim 5, wherein the refrigerant from the condenser is expanded to pure vapor in the motor cavity to provide rotor gap cooling. 7. The system of claim 1, wherein vapor refrigerant is drawn into the first compressor stage through a refrigerant line in fluid communication with the evaporator. 8. The system of claim 1, wherein vapor refrigerant is compressed by the first compressor stage and discharged into an input of the second compressor stage. 9. The system of claim 6, wherein the vapor refrigerant is received in the second compressor stage and further compressed, and the vapor refrigerant flows from an output of the second compressor stage to the condenser. 10. The system of claim 1, wherein the system further comprises an economizer circuit connected between the condenser and the evaporator, the economizer circuit comprising: a flow line in fluid communication with an inlet in the second compressor stage for providing vapor refrigerant to the second compressor stage. 11. The system of claim 1, wherein the motor cavity is in fluid communication with an interstage location between the first stage compressor discharge and the second stage suction inlet through a second flow line. 12. A motor coolant system for a motor powering a compressor in a chiller system, the chiller system comprising a compressor, an evaporator and a condenser connected in a closed loop, the motor coolant system comprising: a motor housing enclosing the motor, and a motor cavity within the motor housing;the coolant system comprising a first connection from the motor cavity in fluid communication with the condenser to deliver a refrigerant into the cavity, and a second connection from the motor cavity in fluid communication with the loop to return refrigerant to an interstage connection having an intermediate pressure, the intermediate pressure greater than an evaporator operating pressure and less than a condenser operating pressure; andthe motor cavity configured to maintain the refrigerant at the intermediate pressure inside the motor cavity. 13. The system of claim 12, the compressor further comprising: a first compressor stage and a second compressor stage;a first seal located between the motor cavity and the first compressor stage, and a second seal located between the motor cavity and the second compressor stage, the first seal and the second seal configured to maintain the refrigerant at an intermediate pressure inside the motor cavity;wherein the pressure inside the motor cavity may be adjusted to approximately a first compressor stage discharge pressure, a second compressor stage suction pressure, or an economizer operating pressure. 14. The system of claim 12, wherein the system further comprises an expander connected between the condenser and the evaporator. 15. The system of claim 12, wherein the motor cavity receives liquid refrigerant from the condenser through a supply line, and vapor refrigerant is vented back to the closed loop at the intermediate pressure. 16. The system of claim 12, wherein the motor cavity is cooled by seal leakage flow of refrigerant from the second stage compressor discharge through the motor cavity and into the first stage compressor. 17. The system of claim 12, wherein the motor is an induction motor, a permanent magnet motor, a hybrid permanent magnet motor, or a solid rotor motor. 18. The system of claim 12, wherein the compressor further comprises bearings, and the bearings are oil film bearings, gas bearings, foil bearings, rolling element bearings, or magnetic bearings. 19. A motor coolant system for a motor powering a compressor in a chiller system, the chiller system comprising a compressor, an evaporator and a condenser connected in a closed loop, the motor coolant system comprising: a motor housing enclosing the motor, and a motor cavity within the motor housing;the coolant system comprising a first connection from the motor cavity in fluid communication with the condenser to deliver a refrigerant into the cavity, and a second connection from the motor cavity in fluid communication with the loop to return refrigerant to the evaporator having a predetermined operating pressure, andthe motor cavity configured to maintain a refrigerant pressure greater than the evaporator operating pressure inside the motor cavity.
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