Refrigeration cycle device

Abstract

A refrigeration cycle device includes a first branch portion with branched first and second refrigerant passages, an ejector located in the first refrigerant passage, a first evaporator located in the first refrigerant passage to evaporate refrigerant flowing out of the ejector, a branch passage through which refrigerant upstream of a nozzle portion of the ejector flows into a refrigerant suction port of the ejector, a first throttle provided in the branch passage, a second evaporator located in the branch passage to evaporate the refrigerant flowing out of the first throttle, a second throttle provided in the second refrigerant passage, and a third evaporator located in the second refrigerant passage to evaporate the refrigerant flowing out of the second throttle. Furthermore, a pressure-loss generation portion is located to generate a pressure loss in the first refrigerant passage, thereby causing the refrigerant to easily flow into the second refrigerant passage.

1 . A refrigeration cycle device comprising:
 a compressor configured to draw and compress refrigerant;   a radiator configured to cool high-pressure refrigerant discharged from the compressor;   a first branch portion configured to branch the refrigerant flowing from the radiator into first and second streams;   first and second refrigerant passages in which the refrigerant of the first stream and the refrigerant of the second stream branched at the first branch portion flow, respectively;   a join portion configured to join the refrigerant flowing from the first refrigerant passage and the refrigerant flowing from the second refrigerant passage;   a second branch portion configured to branch the refrigerant of the first stream in the first refrigerant passage;   an ejector located in the first refrigerant passage, the ejector having a nozzle portion configured to decompress the refrigerant flowing from the second branch portion in the first refrigerant passage;   a first evaporator located in the first refrigerant passage to evaporate the refrigerant flowing out of the ejector;   a branch passage through which the refrigerant branched at the second branch portion flows into the refrigerant suction port of the ejector;   a first throttle portion provided in the branch passage to decompress the refrigerant flowing into the branch passage from the second branch portion;   a second evaporator located in the branch passage to evaporate the refrigerant flowing out of the first throttle portion;   a second throttle portion provided in the second refrigerant passage to decompress the refrigerant flowing into the second refrigerant passage from the first branch portion;   a third evaporator located in the second refrigerant passage to evaporate the refrigerant flowing out of the second throttle portion; and   a pressure-loss generation portion configured to generate a pressure loss in the first refrigerant passage.   
   
   
       2 . The refrigeration cycle device according to  claim 1 , wherein
 the first evaporator and the second evaporator are located to cool air to be blown into a first space to be cooled, and   the third evaporator is located to cool air to be blown into a second space to be cooled.   
   
   
       3 . The refrigeration cycle device according to  claim 1 , wherein
 the pressure-loss generation portion is located in the first refrigerant passage at a position from the first branch portion to the nozzle portion.   
   
   
       4 . The refrigeration cycle device according to  claim 1 , wherein
 the pressure-loss generation portion is located in the first refrigerant passage at a position from the a refrigerant outlet of the ejector to the join portion.   
   
   
       5 . The refrigeration cycle device according to  claim 4 , wherein
 the pressure-loss generation portion is located in the first refrigerant passage at a position from the a refrigerant outlet of the first evaporator to the join portion.   
   
   
       6 . The refrigeration cycle device according to  claim 1 , wherein
 the pressure-loss generation portion is located in the first refrigerant passage to have a throttle mechanism that is configured to decompress the refrigerant in the first refrigerant passage.   
   
   
       7 . The refrigeration cycle device according to  claim 1 , wherein
 the first refrigerant passage is provided with a passage portion that has a passage cross-section area smaller than a passage cross-section area of the second refrigerant passage, and   the pressure-loss generation portion is constructed of the passage portion in the first refrigerant passage.   
   
   
       8 . The refrigeration cycle device according to  claim 1 , wherein
 the pressure-loss generation portion is a pressure-loss generation means provided in the first branch portion, and   the first branch portion is configured to have the pressure-loss generation means for generating the pressure loss in the first refrigerant passage such than an inflow direction of the refrigerant flowing into the first refrigerant passage from the first branch portion is smaller than an inflow direction of the refrigerant flowing into the second refrigerant passage from the first branch portion, relative to an inflow direction of the refrigerant flowing into the first branch portion.   
   
   
       9 . The refrigeration cycle device according to  claim 1 , wherein
 the pressure-loss generation portion is a pressure-loss generation means provided in the join portion, and   the join portion is configured to have the pressure-loss generation means for generating the pressure loss in the first refrigerant passage such that an inflow direction of the refrigerant flowing into the join portion from the first refrigerant passage is smaller than an inflow direction of the refrigerant flowing into the join portion from the second refrigerant passage, relative to a flowing-out direction of the refrigerant flowing out of the join portion.   
   
   
       10 . The refrigeration cycle device according to  claim 2 , wherein
 the first evaporator and the second evaporator are located in series in a flow direction of air flowing toward the first space to be cooled, and   the second evaporator is located downstream of the first evaporator in the flow direction of air.   
   
   
       11 . The refrigeration cycle device according to  claim 1 , wherein the first evaporator and the second evaporator are integrated to form a single evaporator unit. 
   
   
       12 . The refrigeration cycle device according to  claim 11 , wherein the ejector, the branch passage and the first throttle portion are assembled integrally to the evaporator unit. 
   
   
       13 . The refrigeration cycle device according to  claim 1 , further comprising
 a decompression unit located in the first refrigerant passage to decompress the refrigerant before flowing into the nozzle portion of the ejector, wherein the decompression unit is separated from the pressure-loss generation portion.   
   
   
       14 . The refrigeration cycle device according to  claim 13 , wherein the pressure-loss generation portion is located in the first refrigerant passage from the decompression unit to an inlet of the nozzle portion of the ejector.