Vapor-compression refrigerant cycle system with ejector

A vapor-compression refrigerant cycle system comprising

• a compressor which compresses refrigerant;
• a refrigerant radiator for cooling high-pressure refrigerant discharged from the compressor;
• an ejector which includes a nozzle for decompressing and expanding refrigerant from the refrigerant radiator, a refrigerant suction port from which gas refrigerant is drawn by a refrigerant steam jetted from the nozzle, and a pressure-increasing portion in which the refrigerant jetted from the nozzle and the gas refrigerant drawn from the refrigerant suction port are mixed and pressure of the refrigerant is increased by converting the speed energy to pressure energy;
• a first evaporator for evaporating refrigerant flowing out of the pressure-increasing portion of the ejector, the first evaporator being located at a downstream side of the ejector and having a refrigerant outlet coupled to a suction side of the compressor;
• a second evaporator for evaporating refrigerant to be drawn into the refrigerant suction port, the second evaporator having a cooling function for cooling air;
• a blower for blowing air to the second evaporator;
• a valve member for opening and closing a refrigerant passage of the second evaporator, the valve member being arranged in serious with the second evaporator in a refrigerant flow;
• and
• a refrigerant suction pipe having a first end connected to a refrigerant outlet of the second evaporator and a second end connected to the refrigerant suction port, wherein:
• the valve member is opened so that refrigerant always flows into the second evaporator when the compressor operates;
• and
• the blower is stopped when the cooling function of the second evaporator is stopped.

A vapor-compression refrigerant cycle system comprising

• a compressor which compresses refrigerant;
• a refrigerant radiator for cooling high-pressure refrigerant discharged from the compressor;
• an ejector which includes a nozzle for decompressing and expanding refrigerant from the refrigerant radiator, a refrigerant suction port from which gas refrigerant is drawn by a refrigerant steam jetted from the nozzle, and a pressure-increasing portion in which the refrigerant jetted from the nozzle and the gas refrigerant drawn from the refrigerant suction port are mixed and pressure of the refrigerant is increased by converting the speed energy to pressure energy;
• a first evaporator for evaporating refrigerant flowing out of the pressure-increasing portion of the ejector, the first evaporator being located at a downstream side of the ejector and having a refrigerant outlet coupled to a suction side of the compressor;
• a second evaporator for evaporating refrigerant to be drawn into the refrigerant suction port so as to have a cooling function;
• a valve member for opening and closing a refrigerant passage of the second evaporator, the valve member being arranged in serious with the second evaporator in a refrigerant flow;
• a refrigerant suction pipe having a first end connected to a refrigerant outlet of the second evaporator and a second end connected to the refrigerant suction port;
• and
• a control device for controlling operation of the valve member,
• wherein the control device forcibly opens the valve member when a predetermined time passes after the valve member is closed while the compressor operates.

A vapor-compression refrigerant cycle system comprising

• a compressor which compresses refrigerant;
• a refrigerant radiator for cooling high-pressure refrigerant discharged from the compressor;
• an ejector which includes a nozzle for decompressing and expanding refrigerant from the refrigerant radiator, a refrigerant suction port from which gas refrigerant is drawn by a refrigerant steam jetted from the nozzle, and a pressure-increasing portion in which the refrigerant jetted from the nozzle and the gas refrigerant drawn from the refrigerant suction port are mixed and pressure of the refrigerant is increased by converting the speed energy to pressure energy;
• a first evaporator for evaporating refrigerant flowing out of the pressure-increasing portion of the ejector, the first evaporator being located at a downstream side of the ejector and having a refrigerant outlet coupled to a suction side of the compressor;
• a second evaporator for evaporating refrigerant to be drawn into the refrigerant suction port;
• a first valve member for opening and closing a refrigerant passage of the second evaporator, the valve member being arranged in serious with the second evaporator in a refrigerant flow;
• a refrigerant suction pipe having a first end connected to a refrigerant outlet of the second evaporator and a second end connected to the refrigerant suction port;
• a bypass passage through which refrigerant from the refrigerant radiator flows into the refrigerant suction port while bypassing the second evaporator and the valve member;
• and
• a second valve member located in the bypass passage for opening and closing the bypass passage, wherein
• the second valve member is opened when the first valve member is closed while the compressor operates.

A vapor-compression refrigerant cycle system comprising

• a compressor which compresses refrigerant;
• a refrigerant radiator for cooling high-pressure refrigerant discharged from the compressor;
• an ejector which includes a nozzle for decompressing and expanding refrigerant from the refrigerant radiator, a refrigerant suction port from which gas refrigerant is drawn by a refrigerant steam jetted from the nozzle, and a pressure-increasing portion in which the refrigerant jetted from the nozzle and the gas refrigerant drawn from the refrigerant suction port are mixed and pressure of the refrigerant is increased by converting the speed energy to pressure energy;
• a first evaporator for evaporating refrigerant flowing out of the pressure-increasing portion of the ejector, the first evaporator being located at a downstream side of the ejector and having a refrigerant outlet coupled to a suction side of the compressor;
• a second evaporator for evaporating refrigerant to be drawn into the refrigerant suction port;
• a valve member for opening and closing a refrigerant passage of the second evaporator, the valve member being arranged in serious with the second evaporator in a refrigerant flow;
• and
• a refrigerant suction pipe having a first end connected to a refrigerant outlet of the second evaporator and a second end connected to the refrigerant suction port,
• wherein the refrigerant suction port is provided at an upper side of the ejector.