Heat exchanger for lpi vehicle

Abstract

The heat exchanger may include: a heat radiating portion provided with first, second, and third connecting lines formed by stacking a plurality of plates, and adapted to receive first, second, and third operating fluids respectively into the first, second, and third connecting lines, the first, second, and third operating fluids exchanging heat with each other during passing through the first, second, and third connecting lines and the first, second, and third operating fluids supplied to the first, second, and third connecting lines not being mixed with each other and being circulated; first, second, and third inlets connected respectively to the first, second, and third connecting lines so as to supply the first, second, and third operating fluids respectively to the first, second, and third connecting lines; and first, second, and third outlets connected respectively to the first, second, and third connecting lines.

What is claimed is: 
     
         1 . A heat exchanger apparatus for an LPI vehicle that is adapted to cool an LPG fuel returned from an engine in the LPI vehicle using the LPG fuel, the heat exchanger comprising:
 a heat radiating portion provided with first, second, and third connecting lines formed by stacking a plurality of plates, and receiving first, second, and third operating fluids respectively into the first, second, and third connecting lines, the first, second, and third operating fluids exchanging heat with each other during passing through the first, second, and third connecting lines and the first, second, and third operating fluids supplied to the first, second, and third connecting lines not being mixed with each other and being circulated;   first, second, and third inlets formed at a surface of the heat radiating portion, and connected respectively to the first, second, and third connecting lines so as to supply the first, second, and third operating fluids respectively to the first, second, and third connecting lines; and   first, second, and third outlets formed at the other surface of the heat radiating portion corresponding respectively to the first, second, and third inlets, and connected respectively to the first, second, and third connecting lines so as to exhaust the first, second, and third operating fluids respectively from the first, second, and third connecting lines.   
     
     
         2 . The heat exchanger apparatus of  claim 1 , wherein the first operating fluid is the LPG fuel returned from the engine, the second operating fluid is a liquid refrigerant supplied from a condenser of an air conditioning, and the third operating fluid is a gas refrigerant supplied from an evaporator. 
     
     
         3 . The heat exchanger apparatus of  claim 1 , wherein the first inlet is formed at a corner portion on the surface of the heat radiating portion, and the first outlet is formed at a corner portion diagonally facing the first inlet on the other surface of the heat radiating portion. 
     
     
         4 . The heat exchanger apparatus of  claim 1 , wherein the second inlet is formed at a corner portion opposite to the first inlet in a length direction on the surface of the heat radiating portion, and the second outlet is formed at a corner portion opposite to the second inlet in a width direction on the other surface of the heat radiating portion. 
     
     
         5 . The heat exchanger apparatus of  claim 1 , wherein the third inlet is formed apart from the first inlet in a length direction on the surface of the heat radiating portion, and the third outlet is formed at a position opposite to the third inlet in a width direction on the other surface of the heat radiating portion. 
     
     
         6 . The heat exchanger apparatus of  claim 1 , wherein the LPG fuel circulates through the first inlet, the first connecting line, and the first outlet, the gas refrigerant circulates through the second inlet, the second connecting line, and the second outlet, and the liquid refrigerant circulates through the third inlet, the third connecting line, and the third outlet. 
     
     
         7 . The heat exchanger apparatus of  claim 6 , wherein the first connecting line is positioned at a center portion in the heat radiating portion,
 the second connecting line is positioned adjacent to the first connecting line at an upper portion of the heat radiating portion and is positioned apart from the first connecting line at a lower portion of the heat radiating portion, and fluid-communicates therebetween via a first intermediate hole formed in the plurality of plates, and   the third connecting line is positioned above the second connecting line at the upper portion of the heat radiating portion and is positioned between the first connecting line and the second connecting line at the lower portion of the heat radiating portion and fluid-communicates therebetween via a second intermediate hole formed in the plurality of plates.   
     
     
         8 . The heat exchanger apparatus of  claim 7 , wherein the first, second and third connecting lines are aligned as the third, the second, the first, the third, and the second connecting lines from the upper portion to the lower portion of the heat radiating portion in sequence. 
     
     
         9 . The heat exchanger apparatus of  claim 6 , wherein the gas refrigerant and the liquid refrigerant flow in opposite directions in the second connecting line and the third connecting line, respectively. 
     
     
         10 . The heat exchanger apparatus of  claim 1 , wherein the first inlet is connected to the engine, the second inlet is connected to the condenser of the air conditioning, and the third inlet is connected to the evaporator of the air conditioning. 
     
     
         11 . The heat exchanger apparatus of  claim 1 , wherein the first outlet is connected to a bombe which the LPG fuel is returned to and is stored in, the second outlet is connected to a compressor of the air conditioning, and the third outlet is connected to an expansion valve of the air conditioning. 
     
     
         12 . The heat exchanger apparatus of  claim 1 , wherein the heat radiating portion is a heat radiating portion of plate type where the plurality of plates is stacked.