IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0868619
(2004-06-15)
|
등록번호 |
US-7347062
(2008-03-25)
|
우선권정보 |
JP-2003-173845(2003-06-18) |
발명자
/ 주소 |
- Nishijima,Haruyuki
- Takeuchi,Hirotsugu
- Ikemoto,Toru
- Matsunaga,Hisatsugu
- Asaoka,Takeharu
|
출원인 / 주소 |
|
대리인 / 주소 |
Harness, Dickey & Pierce, PLC
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
6 |
초록
▼
An ejector cycle with an ejector includes a nozzle for decompressing refrigerant. A receiver for storing refrigerant is disposed at a refrigerant outlet side of a condenser. A bypass passage and a switching valve for opening and closing the bypass passage are provided so that high-temperature refrig
An ejector cycle with an ejector includes a nozzle for decompressing refrigerant. A receiver for storing refrigerant is disposed at a refrigerant outlet side of a condenser. A bypass passage and a switching valve for opening and closing the bypass passage are provided so that high-temperature refrigerant discharged from a compressor is introduced into an evaporator while bypassing the condenser in a defrosting operation. When the defrosting operation is set, the switching valve is opened while a fan for blowing cool air to the condenser is operated. A part of refrigerant discharged from the compressor flows into the evaporator to remove frost on a surface of the evaporator.
대표청구항
▼
What is claimed is: 1. An ejector cycle comprising: a compressor for compressing refrigerant; a condenser for cooling high-pressure refrigerant discharged from the compressor; an evaporator for evaporating low-pressure refrigerant after being decompressed; an ejector including a nozzle for decompre
What is claimed is: 1. An ejector cycle comprising: a compressor for compressing refrigerant; a condenser for cooling high-pressure refrigerant discharged from the compressor; an evaporator for evaporating low-pressure refrigerant after being decompressed; an ejector including a nozzle for decompressing and expanding refrigerant flowing from the condenser by converting pressure energy of refrigerant to speed energy of the refrigerant, and a pressure-increasing portion that is disposed to increase a pressure of refrigerant by converting the speed energy of refrigerant to the pressure energy of refrigerant while mixing refrigerant jetted from the nozzle and refrigerant sucked from the evaporator; a gas-liquid separator for separating refrigerant from the ejector into gas refrigerant and liquid refrigerant, the gas-liquid separator having a gas refrigerant outlet coupled to a refrigerant suction side of the compressor, and a liquid refrigerant outlet coupled to a refrigerant inlet side of the evaporator; a bypass passage through which hot-gas refrigerant discharged from the compressor flows into a refrigerant inlet of the evaporator while bypassing at least the condenser; a switching valve for opening and closing the bypass passage; a receiver disposed upstream of the nozzle of the ejector at a refrigerant outlet side of the condenser, to store refrigerant therein in a defrosting operation in which the switching valve opens the bypass passage to introduce the hot-gas refrigerant into the evaporator through the by-pass passage; and a variable throttle device disposed at a refrigerant outlet side of the condenser, for decompressing refrigerant before flowing into the nozzle of the ejector, wherein: the variable throttle device chances its throttle open degree in accordance with a super-heating degree of refrigerant at a refrigerant outlet side of the evaporator; when the defrosting operation is set, a part of the refrigerant discharged from the compressor is introduced into the evaporator to remove frost on a surface of the evaporator; and at least for a first predetermined time after the defrosting operation is finished, a first preparative operation, where the variable throttle device is opened while the compressor is stopped, is performed. 2. The ejector cycle according to claim 1, further comprising a blower for blowing air toward the condenser to cool refrigerant in the condenser in a general operation where the refrigerant discharged from the compressor is cooled and condensed in the condenser and refrigerant is evaporated in the evaporator, wherein, in the defrosting operation, the blower is operated. 3. The ejector cycle according to claim 1, wherein: at least for a second predetermined time after the defrosting operation is finished, a second preparative operation, where the switching valve is opened while the compressor is stopped, is performed. 4. The ejector cycle according to claim 1, wherein: in a general operation where the refrigerant discharged from the compressor is cooled and condensed in the condenser and refrigerant is evaporated in the evaporator, the variable throttle device changes its throttle open degree in accordance with the super-heating degree of the refrigerant at the refrigerant outlet side of the evaporator; in the defrosting operation, the switching valve is opened and the variable throttle device is closed; and in the first preparative operation, the variable throttle device is fully opened. 5. An ejector cycle comprising: a compressor for compressing refrigerant; a condenser for cooling high-pressure refrigerant discharged from the compressor; an evaporator for evaporating low-pressure refrigerant after being decompressed; an ejector including a nozzle for decompressing and expanding refrigerant flowing from the condenser by converting pressure energy of refrigerant to speed energy of the refrigerant, and a pressure-increasing portion that is disposed to increase a pressure of refrigerant by converting the speed energy of refrigerant to the pressure energy of refrigerant while mixing refrigerant jetted from the nozzle and refrigerant sucked from the evaporator; a gas-liquid separator for separating refrigerant from the ejector into gas refrigerant and liquid refrigerant, the gas-liquid separator having a gas refrigerant outlet coupled to a refrigerant suction side of the compressor, and a liquid refrigerant outlet coupled to a refrigerant inlet side of the evaporator; a bypass passage through which hot-gas refrigerant discharged from the compressor flows into a refrigerant inlet of the evaporator while bypassing at least the condenser; a switching valve for opening and closing the bypass passage; a receiver disposed upstream of the nozzle of the ejector at a refrigerant outlet side of the condenser, to store refrigerant therein in a defrosting operation in which the switching valve opens the bypass passage to introduce the hot-gas refrigerant into the evaporator through the by-pass passage; an another bypass passage through which refrigerant from the condenser bypasses at least the nozzle; and an another switching valve for opening and closing the another bypass passage; when the defrosting operation is set, the another switching valve is closed so that a part of the refrigerant discharged from the compressor is introduced into the evaporator to remove frost on a surface of the evaporator; and at least for a predetermined time after the defrosting operation is finished, a preparative operation, where the another switching valve is opened, is performed. 6. The ejector cycle according to claim 5, wherein the another bypass is provided such that the refrigerant from the condenser bypasses the variable throttle device and the nozzle of the ejector through the another bypass passage. 7. The ejector cycle according to claim 5, wherein, in the preparative operation, the another switching valve is opened while the compressor is stopped. 8. The ejector cycle according to claim 5, wherein at least a part of the variable throttle device is integrated with the ejector. 9. An ejector cycle comprising: a compressor for compressing refrigerant; a condenser for cooling high-pressure refrigerant discharged from the compressor; an evaporator for evaporating low-pressure refrigerant after being decompressed; a variable throttle device disposed at a refrigerant outlet side of the condenser, for decompressing refrigerant from the condenser; an ejector including a nozzle for decompressing and expanding refrigerant flowing from the variable throttle device by converting pressure energy of refrigerant to speed energy of the refrigerant, and a pressure-increasing portion that is disposed to increase a pressure of refrigerant by converting the speed energy of refrigerant to the pressure energy of refrigerant while mixing refrigerant jetted from the nozzle and refrigerant sucked from the evaporator; a gas-liquid separator for separating refrigerant from the ejector into gas refrigerant and liquid refrigerant, the gas-liquid separator having a gas refrigerant outlet coupled to a refrigerant suction side of the compressor, and a liquid refrigerant outlet coupled to a refrigerant inlet side of the evaporator; a bypass passage through which refrigerant discharged from the compressor flows into a refrigerant inlet of the evaporator while bypassing at least the condenser; and a switching valve for opening and closing the bypass passage, wherein: the variable throttle device changes its throttle open degree in accordance with a super-heating degree of refrigerant at a refrigerant outlet side of the evaporator; when a defrosting operation is set, the switching valve is opened so that at least a part of the refrigerant discharged from the compressor is introduced into the evaporator to remove frost on a surface of the evaporator; and at least for a predetermined time after the defrosting operation is finished, a preparative operation, where the variable throttle device is opened, is performed. 10. The ejector cycle according to claim 1, wherein the receiver has a capacity that is set such that a liquid surface of the liquid refrigerant is positioned at a lower side of a refrigerant inlet through which refrigerant enters into the receiver from the condenser in the defrosting operation. 11. The ejector cycle according to claim 9, further comprising: a receiver disposed upstream of the nozzle of the ejector at a refrigerant outlet side of the condenser, to store refrigerant therein. 12. The ejector cycle according to claim 9, wherein: in a general operation where the refrigerant discharged from the compressor is cooled and condensed in the condenser and refrigerant is evaporated in the evaporator, the variable throttle device changes its throttle open degree in accordance with the super-heating degree of the refrigerant at the refrigerant outlet side of the evaporator; in the defrosting operation, the switching valve is opened and the variable throttle device is closed; and in the preparative operation, the variable throttle device is fully opened.
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