IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0035334
(2005-01-13)
|
등록번호 |
US-7299645
(2007-11-27)
|
우선권정보 |
JP-2004-013491(2004-01-21) |
발명자
/ 주소 |
- Oshitani,Hiroshi
- Takeuchi,Hirotsugu
- Sugiura,Takayuki
|
출원인 / 주소 |
|
대리인 / 주소 |
Harness, Dickey & Pierce, PLC
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
3 |
초록
▼
The present invention has an object to provide an ejector cycle and an ejector, according to which a sufficient cooling performance can be obtained even when the input amount of the refrigerant to the ejector is decreased. A passage changeover means having a bypass channel is formed in an ejector. T
The present invention has an object to provide an ejector cycle and an ejector, according to which a sufficient cooling performance can be obtained even when the input amount of the refrigerant to the ejector is decreased. A passage changeover means having a bypass channel is formed in an ejector. The passage changeover means opens the bypass channel in a bypass cooling operation, in which an input amount of the refrigerant to the ejector is decreased due to a low ambient temperature, and so on. Accordingly, in this bypass cooling operation, the refrigerant from an outside heat exchanger to the ejector bypasses an ejector nozzle and flows to an evaporator through the bypass channel.
대표청구항
▼
What is claimed is: 1. An ejector cycle comprising: a gas-liquid separator for storing gas-phase and liquid-phase refrigerant; a compressor connected to the gas-liquid separator and for sucking refrigerant from the gas-liquid separator and compressing the same; a heat exchanger connected to the com
What is claimed is: 1. An ejector cycle comprising: a gas-liquid separator for storing gas-phase and liquid-phase refrigerant; a compressor connected to the gas-liquid separator and for sucking refrigerant from the gas-liquid separator and compressing the same; a heat exchanger connected to the compressor and for cooling down the refrigerant pumped out from the compressor; an evaporator for evaporating refrigerant; and an ejector connected to the heat exchanger, the evaporator and the gas-liquid separator, wherein the ejector comprises: an inlet port connected to the heat exchanger, through which the refrigerant from the heat exchanger is supplied to the ejector; a suction port connected to the evaporator, through which the refrigerant is sucked from the evaporator into the ejector; a discharge port connected to the gas-liquid separator, through which the refrigerant is discharged from the ejector to the gas-liquid separator; an ejector nozzle for depressurizing and expanding the refrigerant from the heat exchanger, by converting pressure energy to speed energy; a pressure increasing portion for sucking the gas-phase refrigerant from the evaporator by a refrigerant flow ejected from the nozzle and having a high flow velocity, for mixing the refrigerant ejected from the ejector nozzle with the refrigerant sucked from the evaporator, and for increasing fluid pressure of the refrigerant while converting the speed energy of the refrigerant to pressure energy; a first bypass channel for making the refrigerant bypass the nozzle; and a first passage changeover means provided in the ejector for leading the high-pressure refrigerant from the heat exchanger to the ejector nozzle in a normal cooling operation, and for changing a flow passage in order that the refrigerant from the heat exchanger bypasses the ejector nozzle and for leading the refrigerant to the bypass channel in a bypass cooling operation in which an input amount of the refrigerant from the heat exchanger to the ejector is decreased. 2. An ejector cycle according to claim 1, further comprising: a bypass passage connected between a bypass port formed in the ejector and the evaporator; and a depressurizing valve provided in the bypass passage, wherein the refrigerant flows through the bypass passage and the depressurizing valve to the evaporator in the bypass cooling operation. 3. An ejector cycle according to claim 1, wherein the ejector further comprises: a needle guide; a needle movably supported by the needle guide, a forward end of the needle being inserted into an opening of the ejector nozzle, to adjust a cross sectional area of the opening by moving the needle in its axial direction, wherein the needle opens and closes the first bypass channel. 4. An ejector cycle according to claim 1, wherein the ejector further comprises a second passage changeover means having: a second bypass channel provided in the ejector between the first bypass channel and the suction port; and a second movable valve movably arranged in the second bypass channel for opening and closing the suction port and the second bypass channel, wherein the second movable valve closes the second bypass channel and opens the suction port during the normal cooling operation, whereas the second movable valve opens the second bypass channel and closes the suction port when the first bypass channel is opened. 5. An ejector cycle according to claim 4, wherein the second movable valve movably disposed in the second bypass channel is axially moved by a difference of force applied to both ends. 6. An ejector cycle according to claim 4, wherein the second passage changeover means operates as a depressurizing means, when the refrigerant flows through the second bypass channel to the evaporator. 7. An ejector cycle according to claim 1, further comprising: a heat radiating device connected between the compressor and the heat exchanger for radiating heat of the refrigerant from the compressor to the air around the heat radiating device; and a depressurizing device connected between the heat radiating device and the heat exchanger for depressurizing the refrigerant from the heat radiating device, wherein the opening of the ejector nozzle is closed and the first and second bypass channels as well as the suction port are opened by the first and second passage changeover means, when the ejector cycle operates in a heating operation, so that the refrigerant from the heat exchanger bypasses the ejector nozzle and flows through the first and second bypass channels and the suction port to the gas-liquid separator. 8. An ejector cycle comprising: a gas-liquid separator for storing gas-phase and liquid-phase refrigerant; a compressor connected to the gas-liquid separator and for sucking refrigerant from the gas-liquid separator and compressing the same; a heat radiating device connected to the compressor for radiating heat of the refrigerant from the compressor to the air around the heat radiating device; and a depressurizing device connected to the heat radiating device for depressurizing the refrigerant from the heat radiating device, a heat exchanger connected to the depressurizing device for cooling down the refrigerant; an evaporator for evaporating refrigerant; and an ejector connected to the heat exchanger, the evaporator and the gas-liquid separator, wherein the ejector comprises: an inlet port connected to the heat exchanger, through which the refrigerant from the heat exchanger is supplied to the ejector; a suction port connected to the evaporator, through which the refrigerant is sucked from the evaporator into the ejector; a discharge port connected to the gas-liquid separator, through which the refrigerant is discharged from the ejector to the gas-liquid separator; an ejector nozzle for depressurizing and expanding the refrigerant from the heat exchanger, by converting pressure energy to speed energy; a pressure increasing portion for sucking the gas-phase refrigerant from the evaporator by a refrigerant flow ejected from the nozzle and having a high flow velocity, for mixing the refrigerant ejected from the ejector nozzle with the refrigerant sucked from the evaporator, and for increasing fluid pressure of the refrigerant while converting the speed energy of the refrigerant to pressure energy; a first bypass channel for making the refrigerant bypass the nozzle; a first passage changeover means provided in the ejector for leading the high-pressure refrigerant from the heat exchanger to the ejector nozzle in a normal cooling operation, and for changing a flow passage in order that the refrigerant from the heat exchanger bypasses the ejector nozzle and for leading the refrigerant to the bypass channel in a bypass cooling operation in which an input amount of the refrigerant from the heat exchanger to the ejector is decreased; a second bypass channel provided in the ejector between the first bypass channel and the suction port; and a second movable valve movably arranged in the second bypass channel for opening and closing the suction port and the second bypass channel, wherein the second movable valve closes the second bypass channel and opens the suction port during the normal cooling operation, whereas the second movable valve opens the second bypass channel and closes the suction port when the first bypass channel is opened. 9. An ejector cycle according to claim 8, wherein the ejector further comprises: a third bypass channel provided in the ejector, so that one end is communicated with an inlet port of the ejector, while the other end is communicated with a suction portion of the ejector; and a third movable valve movably arranged in the third bypass channel for opening and closing the third bypass channel, wherein the third movable valve closes the third bypass channel when fluid pressure of the refrigerant flowing through the inlet port is high during the cooling operation, whereas the third movable valve opens the third bypass channel when the fluid pressure of the refrigerant becomes lower during a heating operation so that a portion of the refrigerant flows to the suction portion through the third bypass channel. 10. An ejector cycle according to claim 9, wherein the third movable valve movably disposed in the third bypass channel is axially moved by a difference of force applied to both ends. 11. An ejector cycle according to claim 9, wherein the second passage changeover means operates as a depressurizing means, when the refrigerant flows through the second bypass channel to the evaporator.
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