Patent ID: 8905122

Claim:
A heat exchanger for an LPI (Liquefied Petroleum Injection) vehicle that is adapted to cool high-temperature LPG (Liquefied Petroleum Gasoline) fuel returned from an engine in the LPI vehicle using the LPG fuel, the heat exchanger comprising: a pipe unit mounted on a refrigerant line that connects a compressor with an evaporator of an air conditioner and adapted to flow a refrigerant and the high-temperature LPG fuel returned from the engine, wherein the refrigerant flows substantially in a center portion of the pipe unit and the high-temperature LPG fuel flows substantially in an outer portion that is outside of the center portion of the pipe unit so that the high-temperature LPG fuel is capable of exchanging heat with the refrigerant; a first connecting member mounted at an end of the pipe unit to connect the pipe unit with the refrigerant line where the refrigerant line is connected to the compressor, wherein the first connecting member includes an inflow port into which the LPG fuel flows; and a second connecting member mounted at the other end of the pipe unit to connect the pipe unit with the refrigerant line where the refrigerant line is connected to the evaporator, wherein the second connecting member includes an exhaust port from which the LPG fuel passing the pipe unit is exhausted; wherein the pipe unit comprises: a refrigerant pipe providing a refrigerant passage in which the low-temperature and low-pressure gaseous refrigerant supplied from the evaporator through the refrigerant line flows, wherein the refrigerant pipe is disposed substantially at the center portion of the pipe unit; a fuel pipe providing a fuel passage formed between the refrigerant pipe and the fuel pipe and in which the LPG fuel flows, wherein the fuel pipe surrounds the refrigerant pipe; and a bypass pipe fluidly-bypassing the fuel pipe and providing a bypass passage for detouring the LPG fuel, wherein the bypass pipe surrounds the fuel pipe and the bypass passage is formed between the fuel pipe and the bypass pipe; and wherein the fuel pipe and the bypass pipe are formed in an entire length between the inflow port and the exhaust port.