Ejector cycle system

Abstract

An ejector cycle system with a refrigerant cycle through which refrigerant flows includes an ejector disposed downstream of a radiator, a first evaporator that evaporates refrigerant flowing out of the ejector, a throttling unit located in a branch passage and depressurizes refrigerant to adjust a flow rate of refrigerant, and a second evaporator located downstream of the throttling unit. In the ejector cycle system, a flow ratio adjusting means adjusts a flow ratio between a first refrigerant flow amount depressurized and expanded in a nozzle portion of the ejector and a second refrigerant flow amount drawn into a refrigerant suction port of the ejector, based on a physical quantity related to at least one of a state of refrigerant in the refrigerant cycle, a temperature of a space to be cooled by the first and second evaporators, and an ambient temperature of the space.

Description

CROSS REFERENCE TO RELATED APPLICATION

[0001] This application is based on Japanese Patent Applications No. 2005-191156 filed on Jun. 30, 2005, No. 2005-233169 filed on Aug. 11, 2005, and No. 2005-237651 filed on Aug. 18, 2005, the contents of which are incorporated herein by reference in its entirety. FIELD OF THE INVENTION

[0002] The present invention relates to an ejector cycle system having an ejector that functions as a refrigerant pressure reducing means and a refrigerant circulating means. BACKGROUND OF THE INVENTION

[0003] Ejector cycle systems provided with multiple evaporators have been conventionally known as in JP Patent No. 3322263 (corresponding to U.S. Pat. No. 6,574,987, U.S. Pat. No. 6,477,857).

[0004] As illustrated in FIG. 26, a first evaporator 16 is connected downstream of an ejector 15 with respect to a refrigerant flow. An accumulator 32 that forms a vapor-liquid separator is located downstream of the first evaporator 16 with respect to the refrigerant flow. F...

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