Ejector refrigeration cycle

Patent metadata

Field	Value
Publication number	US-10132526-B2
Application number	US-201515304667-A
Country	US
Kind code	B2
Filing date	May 18, 2015
Priority date	May 30, 2014
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

In an ejector refrigeration cycle, an inlet of a nozzle portion of an ejector is connected to a refrigerant outlet side of a high-stage side evaporator, a refrigerant suction port of the ejector is connected to a refrigerant outlet side of a low-stage side evaporator, and an internal heat exchanger is provided for exchanging heat between a high-pressure refrigerant flowing into a low-stage side throttle device for decompressing the refrigerant flowing into the low-stage side evaporator, and a low-stage side low-pressure refrigerant flowing out of the low-stage side evaporator. Because a difference in enthalpy between the inlet and outlet of the low-stage side evaporator can be enlarged, the cooling capacities exhibited by the respective evaporators can be adjusted to be closer to each other even if the flow-rate ratio Ge/Gn of the suction refrigerant flow rate Ge to the injection refrigerant flow rate Gn is set to a relatively small value so as to make it possible to improve the COP of the cycle.

First claim

What is claimed is:

1. An ejector refrigeration cycle comprising:
a compressor that compresses and discharges a refrigerant;
a radiator that dissipates heat from the refrigerant discharged from the compressor;
a branch portion that branches a flow of the refrigerant flowing out of the radiator;
a first decompression device and a second decompression device that decompress the refrigerant flowing out of the radiator, wherein one refrigerant outflow port of the branch portion is connected to an inlet side of the first decompression device, and the other refrigerant outflow port of the branch portion is connected to an inlet side of the second decompression device;
a first evaporator that evaporates the refrigerant decompressed by the first decompression device to cool air;
a second evaporator that evaporates the refrigerant decompressed by the second decompression device to cool air;
an ejector that draws the refrigerant on a downstream side of the second evaporator from a refrigerant suction port by a suction effect of an injection refrigerant injected from a nozzle portion adapted to decompress the refrigerant flowing out of the first evaporator, and mixes the injection refrigerant with a suction refrigerant drawn from the refrigerant suction port, to pressurize the mixed refrigerant; and
an internal heat exchanger that exchanges heat between a high-pressure refrigerant and any one of a high-stage side low-pressure refrigerant and a low-stage side low-pressure refrigerant, (i) when the high-pressure refrigerant is defined as a refrigerant circulating through at least one of a refrigerant flow path leading from a refrigerant outlet side of the radiator to the inlet side of the first decompression device and a refrigerant flow path leading from the refrigerant outlet side of the radiator to the inlet side of the second decompression device, (ii) when the high-stage side low-pressure refrigerant is defined as a refrigerant circulating through a refrigerant flow path leading from a refrigerant outlet side of the first evaporator to an inlet side of the nozzle portion of the ejector, and (iii) when the low-stage side low-pressure refrigerant is defined as a refrigerant circulating through a refrigerant flow path leading from a refrigerant outlet side of the second evaporator to the refrigerant suction port of the ejector, wherein
the internal heat exchanger exchanges heat between the low-stage side low-pressure refrigerant and a high-pressure refrigerant circulating through a refrigerant flow path leading from the other refrigerant outflow port of the branch portion to the inlet side of the second decompression device.

2. An ejector refrigeration cycle comprising:
a compressor that compresses and discharges a refrigerant;
a radiator that dissipates heat from the refrigerant discharged from the compressor;
a branch portion that branches a flow of the refrigerant flowing out of the radiator;
a first decompression device and a second decompression device that decompress the refrigerant flowing out of the radiator, wherein one refrigerant outflow port of the branch portion is connected to an inlet side of the first decompression device, and the other refrigerant outflow port of the branch portion is connected to an inlet side of the second decompression device;
a first evaporator that evaporates the refrigerant decompressed by the first decompression device;
a second evaporator that evaporates the refrigerant decompressed by the second decompression device;
an ejector that draws the refrigerant on a downstream side of the second evaporator from a refrigerant suction port by a suction effect of an injection refrigerant injected from a nozzle portion adapted to decompress the refrigerant flowing out of the first evaporator, and mixes the injection refrigerant with a suction refrigerant drawn from the refrigerant suction port, to pressurize a mixed refrigerant of the injection refrigerant and the suction refrigerant; and
an internal heat exchanger that exchanges heat between a high-pressure refrigerant and any one of a high-stage side low-pressure refrigerant and a low-stage side low-pressure refrigerant, (i) when the high-pressure refrigerant is defined as a refrigerant circulating through at least one of a refrigerant flow path leading from a refrigerant outlet side of the radiator to an inlet side of the first decompression device and a refrigerant flow path leading from the refrigerant outlet side of the radiator to an inlet side of the second decompression device, (ii) when the high-stage side low-pressure refrigerant is defined as a refrigerant circulating through a refrigerant flow path leading from a refrigerant outlet side of the first evaporator to an inlet side of the nozzle portion of the ejector, and (iii) when the low-stage side low-pressure refrigerant is defined as a refrigerant circulating through a refrigerant flow path leading from a refrigerant outlet side of the second evaporator to the refrigerant suction port of the ejector, wherein
the internal heat exchanger exchanges heat between the high-stage side low-pressure refrigerant and a high-pressure refrigerant circulating through a refrigerant flow path leading from the other refrigerant outflow port of the branch portion to the inlet side of the second decompression device.

Assignees

• Denso Corp

Inventors

• Ogata Gouta
• Shirota Yuichi
• Hasegawa Hiroya
• Suzuki Tatsuhiro

Classifications

• F25B41/067

  Mechanical Engineering · mapped topic

• F25B2341/0011

  Ejectors with the cooled primary flow at reduced or low pressure · CPC title

• F25B5/02 Primary

  arranged in parallel · CPC title

• F25B1/06 Primary

  with compressor of jet type, e.g. using liquid under pressure ({F25B1/005,} F25B1/10 take precedence) · CPC title

• F25B1/00

  Compression machines, plants or systems with non-reversible cycle (F25B3/00, F25B5/00, F25B6/00, F25B7/00, F25B9/00 take precedence) · CPC title