Ejector decompression device with throttle controllable nozzle
AssigneeDenso Corporation
InventorsTakeshi Sakai, Satoshi Nomura, Hirotsugu Takeuchi
Life of this patent
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Abstract
An ejector for a refrigerant cycle includes a nozzle having therein a refrigerant passage, and a needle valve provided in the refrigerant passage of the nozzle upstream from a throat portion of the nozzle. The needle valve is disposed in the nozzle to define therebetween a throttle portion that is positioned upstream from the throat portion. A top end portion of the needle valve and an inner wall of the nozzle are formed, so that refrigerant is decompressed to a gas-liquid two-phase state at upstream of the throat portion. Accordingly, a throttle degree of the nozzle can be variably controlled while ejector efficiency is not deteriorated.
Claims12
An ejector decompression device for a refrigerant cycle that includes a radiator for radiating heat of refrigerant compressed by a compressor, and an evaporator for evaporating refrigerant after being decompressed, the ejector decompression device comprising:
- a nozzle having an inner wall defining a refrigerant passage, for decompressing and expanding refrigerant flowing from the radiator by converting pressure energy of refrigerant to speed energy of the refrigerant, the nozzle including a throat portion having a cross-sectional area that is smallest in the refrigerant passage of the nozzle, and an expansion portion in which the cross-sectional area is increased toward downstream in a refrigerant flow;
- 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 injected from the nozzle and refrigerant sucked from the evaporator;
- and
- a needle valve disposed to be displaced in the refrigerant passage of the nozzle in an axial direction of the nozzle, for adjusting an opening degree of the refrigerant passage of the nozzle,
- wherein the needle valve and the inner wall of the nozzle are provided to have predetermined shapes so that refrigerant flowing into the nozzle is decompressed to a gas-liquid two-phase state at upstream from the throat portion in the refrigerant flow.
An ejector decompression device for a refrigerant cycle that includes a radiator for radiating heat of refrigerant compressed by a compressor, and an evaporator for evaporating refrigerant after being decompressed, the ejector decompression device comprising:
- a nozzle having an inner wall defining a refrigerant passage, for decompressing and expanding refrigerant flowing from the radiator by converting pressure energy of refrigerant to speed energy of the refrigerant, the nozzle including a throat portion having a cross-sectional area that is smallest in the refrigerant passage of the nozzle, and an expansion portion in which the cross-sectional area is increased from the throat portion toward downstream in a refrigerant flow;
- 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 injected from the nozzle and refrigerant sucked from the evaporator;
- and
- a needle valve disposed to be displaced in the refrigerant passage of the nozzle in an axial direction of the nozzle, for adjusting an opening degree of the refrigerant passage of the nozzle, wherein:
- the needle valve and the inner wall of the nozzle are provided to define therebetween a throttle portion at which a passage sectional area becomes smallest;
- and
- the throttle portion is provided upstream from the throat portion in the refrigerant flow.
Dependencies are inferred from the claim text.