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US 6,438,993 B2Granted
Ejector cycle system
AssigneeDenso Corporation
InventorsHirotsugu Takeuchi, Yoshitaka Kume, Hiroshi Oshitani, Gota Ogata
Life of this patent
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Abstract
In an ejector cycle system, a mixing portion of an ejector has a length in a refrigerant flow direction and an equivalent diameter, and a ratio of the length to the equivalent diameter of the mixing portion is equal to or smaller than 120. Further, a ratio of the equivalent diameter of the mixing portion to an equivalent diameter at an outlet of a nozzle of the ejector is in a range of 1.05-10. Accordingly, the ejector cycle system operates while a high ejector efficiency is maintained.
Claims50
An ejector cycle system comprising:
- a compressor for sucking and compressing refrigerant;
- a radiator for cooling refrigerant discharged from the compressor;
- an evaporator in which refrigerant is evaporated by absorbing heat;
- an ejector having a nozzle in which a pressure energy of high-pressure side refrigerant flowing from the radiator is converted to a speed energy so that refrigerant is decompressed and expanded, and a pressure-increasing portion in which the speed energy is converted to the pressure energy so that the pressure of refrigerant is increased while refrigerant discharged from the nozzle and refrigerant sucked from the evaporator are mixed;
- and
- a gas-liquid separator for storing refrigerant and for separating refrigerant into gas refrigerant and liquid refrigerant, wherein:
- the nozzle is a divergent nozzle having therein a throat portion at which a passage sectional area becomes smallest in a refrigerant passage of the divergent nozzle;
- the divergent nozzle has a first dimension between the throat portion and an outlet of the nozzle, and a second dimension between the throat portion and an upstream portion upstream from the throat portion, from which the passage sectional area becomes smaller in the refrigerant passage of the divergent nozzle, the first dimension being larger than the second dimension;
- the pressure-increasing portion has a length in a refrigerant flow direction and a smallest equivalent diameter, and a ratio of the length to the smallest equivalent diameter is equal to or smaller than 120;
- and
- a ratio of the smallest equivalent diameter of the pressure-increasing portion to an equivalent diameter at the outlet of the nozzle is in a range of 1.05-10.
8 more elements
An ejector cycle system comprising:
- a compressor for sucking and compressing refrigerant;
- a radiator for cooling refrigerant discharged from the compressor;
- an evaporator in which refrigerant is evaporated by absorbing heat;
- an ejector having a nozzle in which a pressure energy of high-pressure side refrigerant flowing from the radiator is converted to a speed energy so that refrigerant is decompressed and expanded, a mixing portion in which gas refrigerant evaporated in the evaporator is sucked by a high-speed refrigerant flow ejected from the nozzle, and a diffuser in which the speed energy is converted to a pressure energy so that the pressure of refrigerant is increased while refrigerant discharged from the nozzle and refrigerant sucked from the evaporator are mixed;
- and
- a gas-liquid separator for storing refrigerant and for separating refrigerant into gas refrigerant and liquid refrigerant, wherein:
- the nozzle is a divergent nozzle having therein a throat portion at which a passage sectional area becomes smallest in a refrigerant passage of the divergent nozzle;
- the divergent nozzle has a first dimension between the throat portion and an outlet of the nozzle, and a second dimension between the throat portion and an upstream portion upstream from the throat portion, from which the passage sectional area becomes smaller in the refrigerant passage of the divergent nozzle, the first dimension being larger than the second dimension;
- the mixing portion has a length in a refrigerant flow direction and an equivalent diameter, and a ratio of the length to the equivalent diameter is equal to or smaller than 120;
- and
- a ratio of the equivalent diameter of the mixing portion to an equivalent diameter at the outlet of the nozzle is in a range of 1.05-10.
8 more elements
An ejector cycle system comprising:
- a compressor for sucking and compressing refrigerant;
- a radiator for cooling refrigerant discharged from the compressor;
- an evaporator in which refrigerant is evaporated by absorbing heat;
- a nozzle in which a pressure energy of high-pressure side refrigerant flowing from the radiator is converted to a speed energy so that refrigerant is decompressed and expanded;
- and
- a gas-liquid separator for storing refrigerant and for separating refrigerant into gas refrigerant and liquid refrigerant, wherein:
- the nozzle has a refrigerant ejecting port from which refrigerant is ejected;
- the refrigerant ejecting port of the nozzle is directly connected to and is opened into the gas-liquid separator;
- gas refrigerant in the evaporator is sucked by a high-speed refrigerant flow ejected from the nozzle;
- and
- the speed energy of refrigerant in the nozzle is converted to the pressure energy while refrigerant discharged from the nozzle and refrigerant sucked from the evaporator are mixed within the gas-liquid separator.
8 more elements
An ejector cycle system comprising:
- a compressor for sucking and compressing refrigerant;
- a radiator for cooling refrigerant discharged from the compressor;
- an evaporator in which refrigerant is evaporated by absorbing heat;
- a nozzle in which a pressure energy of high-pressure side refrigerant flowing from the radiator is converted to a speed energy so that refrigerant is decompressed and expanded;
- a mixing portion, in which gas refrigerant evaporated in the evaporator is sucked by a high-speed refrigerant flow ejected from the nozzle, and refrigerant discharged from the nozzle and refrigerant sucked from the evaporator are mixed;
- a gas-liquid separator for storing refrigerant and for separating refrigerant into gas refrigerant and liquid refrigerant, wherein:
- the mixing portion has a constant diameter and defines a refrigerant outlet from which refrigerant flows out;
- refrigerant outlet of the mixing portion is directly connected to and is opened into the gas-liquid separator;
- and
- within the gas-liquid separator, the speed energy of refrigerant flowing from the mixing portion is converted to the pressure energy to increase refrigerant pressure.
7 more elements
An ejector cycle system comprising:
- a compressor for sucking and compressing refrigerant;
- a radiator for cooling refrigerant discharged from the compressor;
- an evaporator in which refrigerant is evaporated by absorbing heat;
- and
- an ejector having a first nozzle in which a pressure energy of high-pressure side refrigerant flowing from the radiator is converted to a speed energy so that refrigerant is decompressed and expanded, a second nozzle disposed around the first nozzle in such a manner that refrigerant from the evaporator is sucked and is ejected by a refrigerant flow ejected from the first nozzle, and a pressure-increasing portion in which the speed energy is converted to the pressure energy so that the pressure of refrigerant is increased while refrigerant ejected from the first nozzle and refrigerant ejected from the second nozzle are mixed, wherein:
- the first nozzle has a first injecting port from which refrigerant from the radiator is injected, and the second nozzle has a second injecting port from which refrigerant from the evaporator is injected;
- and
- the first injecting port and the second injecting port are provided at an approximately equal position in a refrigerant passage of the ejector in a refrigerant flow direction.
5 more elements
An ejector cycle system comprising:
- a compressor for sucking and compressing refrigerant;
- a radiator for cooling refrigerant discharged from the compressor;
- an evaporator in which refrigerant is evaporated by absorbing heat;
- an ejector having a nozzle in which a pressure energy of high-pressure side refrigerant flowing from the radiator is converted to a speed energy so that refrigerant is decompressed and expanded, a mixing portion in which gas refrigerant evaporated in the evaporator is sucked by a high-speed refrigerant flow ejected from the nozzle to be mixed with refrigerant ejected from the nozzle, and a diffuser in which the speed energy is converted to the pressure energy so that the pressure of refrigerant is increased;
- and
- a gas-liquid separator for storing refrigerant and for separating refrigerant into gas refrigerant and liquid refrigerant;
- wherein:
- the ejector is constructed in such a manner that refrigerant from the mixing portion flows into the diffuser after a flow rate of refrigerant sucked from the evaporator and a flow rate of refrigerant ejected from the nozzle becomes approximately equal in the mixing portion;
- the nozzle is a divergent nozzle having therein a throat portion at which a passage sectional area becomes smallest in a refrigerant passage of the divergent nozzle;
- the divergent nozzle has a first dimension between the throat portion and an outlet of the nozzle, and a second dimension between the throat portion and an upstream portion upstream from the throat portion, from which the passage sectional area becomes smaller in the refrigerant passage of the divergent nozzle, the first dimension being larger than the second dimension;
- the mixing portion has a length in a refrigerant flow direction and an equivalent diameter, and a ratio of the length to the equivalent diameter is equal to or smaller than 120;
- and
- a ratio of the equivalent diameter of the pressure-increasing portion to an equivalent diameter at the outlet of the nozzle is in a range of 1.05-10.
10 more elements
An ejector cycle system comprising:
- a compressor for sucking and compressing refrigerant;
- a radiator for cooling refrigerant discharged from the compressor;
- an evaporator in which refrigerant is evaporated by absorbing heat;
- an ejector having a nozzle in which a pressure energy of high-pressure side refrigerant flowing from the radiator is converted to a speed energy so that refrigerant is decompressed and expanded, a mixing portion in which gas refrigerant evaporated in the evaporator is sucked by a high-speed refrigerant flow ejected from the nozzle to be mixed with refrigerant ejected from the nozzle, and a diffuser in which the speed energy is converted to the pressure energy so that the pressure of refrigerant is increased;
- and
- a gas-liquid separator for storing refrigerant and for separating refrigerant into gas refrigerant and liquid refrigerant;
- wherein:
- the ejector is constructed in such a manner that refrigerant from the mixing portion flows into the diffuser after a flow rate of refrigerant sucked from the evaporator and a flow rate of refrigerant ejected from the nozzle becomes approximately equal in the mixing portion;
- the nozzle is constructed by a nozzle group having a plurality of nozzle parts, the system further comprising
- a valve for controlling a flow amount of refrigerant flowing into the nozzle group.
7 more elements
An ejector cycle system comprising:
- a compressor for sucking and compressing refrigerant;
- a radiator for cooling refrigerant discharged from the compressor;
- an evaporator in which refrigerant is evaporated by absorbing heat;
- an ejector having a nozzle in which a pressure energy of high-pressure side refrigerant flowing from the radiator is converted to a speed energy so that refrigerant is decompressed and expanded, a mixing portion in which gas refrigerant evaporated in the evaporator is sucked by a high-speed refrigerant flow ejected from the nozzle to be mixed with refrigerant ejected from the nozzle, and a diffuser in which the speed energy is converted to the pressure energy so that the pressure of refrigerant is increased;
- and
- a gas-liquid separator for storing refrigerant and for separating refrigerant into gas refrigerant and liquid refrigerant;
- wherein:
- the ejector is constructed in such a manner that refrigerant from the mixing portion flows into the diffuser after a flow rate of refrigerant sucked from the evaporator and a flow rate of refrigerant ejected from the nozzle becomes approximately equal in the mixing portion;
- the refrigerant is a mixing refrigerant obtained by mixing plural refrigerant materials.
6 more elements
An ejector cycle system comprising:
- a compressor for sucking and compressing refrigerant;
- a radiator for cooling refrigerant discharged from the compressor;
- an evaporator in which refrigerant is evaporated by absorbing heat;
- an ejector having a nozzle in which a pressure energy of high-pressure side refrigerant flowing from the radiator is converted to a speed energy so that refrigerant is decompressed and expanded, a mixing portion in which gas refrigerant evaporated in the evaporator is sucked by a high-speed refrigerant flow ejected from the nozzle to be mixed with refrigerant ejected from the nozzle, and a diffuser in which the speed energy of refrigerant from the mixing portion is converted to the pressure energy so that the pressure of refrigerant is increased;
- and
- a gas-liquid separator for storing refrigerant and for separating refrigerant into gas refrigerant and liquid refrigerant, wherein,
- the ejector is constructed so that a pressure-increasing ratio of a pressure-increasing amount in the mixing portion to an entire pressure-increasing amount in the ejector is set to be equal to or larger than 50% when carbon dioxide is used as refrigerant.
4 more elements
An ejector cycle system comprising:
- a compressor for sucking and compressing refrigerant;
- a radiator for cooling refrigerant discharged from the compressor;
- an evaporator in which refrigerant is evaporated by absorbing heat;
- an ejector having a nozzle in which a pressure energy of high-pressure side refrigerant flowing from the radiator is converted to a speed energy so that refrigerant is decompressed and expanded, a mixing portion in which gas refrigerant evaporated in the evaporator is sucked by a high-speed refrigerant flow ejected from the nozzle to be mixed with refrigerant ejected from the nozzle, and a diffuser in which the speed energy of refrigerant from the mixing portion is converted to the pressure energy so that the pressure of refrigerant is increased;
- and
- a gas-liquid separator for storing refrigerant and for separating refrigerant into gas refrigerant and liquid refrigerant, wherein,
- the ejector is constructed so that a pressure-increasing ratio of a pressure-increasing amount in the mixing portion to an entire pressure-increasing amount in the ejector is set to be equal to or larger than 30% when freon is used as refrigerant.
4 more elements
Dependencies are inferred from the claim text.