Dual air conditioner for vehicle

Abstract

The present invention relates to a dual air conditioner for a vehicle, which includes a rear high-temperature pipe that is connected to a rear expansion valve of a rear air conditioner and installed in such a way as to be directly branched from a dual pipe type internal heat exchanger of a front air conditioner, thereby reducing the number of required components and simplifying the manufacturing process with no need to use a connector for branching the rear high-temperature pipe from the front air conditioner, and enhancing a refrigerant movement and reducing material expenses and working process by simplifying piping work and a piping route.

1 . A dual air conditioner for a vehicle comprising:
 a front air conditioner including: a compressor for sucking and compressing refrigerant; a condenser for condensing refrigerant compressed in the compressor; a front expansion valve for throttling the refrigerant condensed in the condenser; a front evaporator for evaporating the refrigerant introduced from the front expansion valve; and a dual pipe type internal heat exchanger having a dual pipe structure formed at a section of a front low-temperature pipe for connecting the front evaporator and the compressor with each other and a high-temperature pipe and a front high-temperature pipe for connecting the condenser and the front expansion valve with each other, the dual pipe type internal heat exchanger heat-exchanging the refrigerants that flow in the pipes with each other, the front air conditioner cooling the front seat side of the vehicle; and   a rear air conditioner including: a rear high-temperature pipe for branching refrigerant flowing from the condenser toward the front expansion valve and a rear expansion valve for throttling the branched refrigerant; and a rear evaporator for evaporating refrigerant introduced from the rear expansion valve and joining the refrigerant with refrigerant flowing from the front evaporator to the compressor, the rear high-temperature pipe being connected to a side of the dual pipe type internal heat exchanger in such a way as to be directly branched from the internal heat exchanger and being connected with the rear expansion valve, the rear air conditioner cooling the rear seat side of the vehicle.   
     
     
         2 . The dual air conditioner according to  claim 1 , wherein the dual pipe type internal heat exchanger comprises: an inner pipe disposed at the section of the front low-temperature pipe for connecting the front evaporator and the compressor with each other; and an outer pipe joined to the outer circumferential surface of the inner pipe in a dual pipe structure, the outer pipe having expanded pipe parts formed at both ends thereof, one of the expanded pipe parts being connected with the high-temperature pipe connected with the condenser, the other of the expanded pipe parts being connected with the front high-temperature pipe connected with the front expansion valve, and
 wherein the rear high-temperature pipe is connected to the expanded pipe part of the outer pipe, to which the front high-temperature pipe connected with the front expansion valve is connected.   
     
     
         3 . The dual air conditioner according to  claim 2 , wherein the front high-temperature pipe and the rear high-temperature pipe, which are respectively connected to the expanded pipe part of the outer pipe, are connected in a circumferential direction of the expanded pipe part in a state where they are spaced apart from each other at a predetermined interval. 
     
     
         4 . The dual air conditioner according to  claim 3 , wherein the front high-temperature pipe is connected to one side of a vertical centerline of the expanded pipe part in such a way as to be inclined at a predetermined angle and the rear high-temperature pipe is connected to the other side of the vertical centerline in such a way as to be inclined at a predetermined angle, and the inclination angles of the pipes are controlled so that a flow rate of the refrigerant distributed to the pipes can be controlled. 
     
     
         5 . The dual air conditioner according to  claim 4 , wherein the inclination angle of the front high-temperature pipe is smaller than the inclination angle of the rear high-temperature pipe. 
     
     
         6 . The dual air conditioner according to  claim 2 , wherein the front high-temperature pipe and the rear high-temperature pipe, which are respectively connected to the expanded pipe part of the outer pipe, are connected in a longitudinal direction of the expanded pipe part in a state where they are spaced apart from each other at a predetermined interval, and diameters of the pipes are controlled so that the flow rate of the refrigerant distributed to the pipes can be controlled. 
     
     
         7 . The dual air conditioner according to  claim 6 , wherein the diameter of the front high-temperature pipe is greater than the diameter of the rear high-temperature pipe. 
     
     
         8 . The dual air conditioner according to  claim 6 , wherein a length of the expanded pipe part, to which the front high-temperature pipe and the rear high-temperature pipe are connected, is greater than a length of the expanded pipe part, to which the high-temperature pipe is connected. 
     
     
         9 . The dual air conditioner according to  claim 2 , wherein the front high-temperature pipe and the rear high-temperature pipe, which are respectively connected to the expanded pipe part of the outer pipe, are connected in a refrigerant flow direction of the expanded pipe part in such a way as to be spaced apart from each other at a predetermined interval, and an arrangement order of the pipes, which are respectively connected in the refrigerant flow direction of the expanded pipe part, is changed so that the flow rate of the refrigerant distributed to the pipes can be controlled. 
     
     
         10 . The dual air conditioner according to  claim 9 , wherein the front high-temperature pipe is connected closer to the upstream side of the refrigerant flow direction of the expanded pipe part than the rear high-temperature pipe. 
     
     
         11 . The dual air conditioner according to  claim 9 , wherein the dual pipe type internal heat exchanger comprises a spiral projection portion and a spiral groove portion formed on one of the inner pipe and the outer pipe; a first refrigerant channel formed inside the inner pipe; and a second refrigerant channel formed between the inner pipe and the outer pipe. 
     
     
         12 . The dual air conditioner according to  claim 11 , wherein the first refrigerant channel is a channel that the refrigerant discharged from the front evaporator and the rear evaporator is joined and flows, and the second refrigerant channel is a channel that the refrigerant discharged from the condenser flows.