Heat Exchanger for Vehicle

Abstract

A heat exchanger for a vehicle may include a heat exchanging part including a plurality of introduction holes and discharge holes to introduce and discharge respective working fluids, including a plurality of plates stacked therein to alternately form channels through which the respective working fluids flow, and heat-exchanging the respective working fluids passing through the respective channels with each other, a bypass part forming a bypass channel which is connected to a sub-discharge hole in a sub-introduction hole, sub-discharge holes formed at both sides based on a connection hole formed at one side in one surface of the heat exchanging part, and a valve unit mounted at the connection hole, the sub-introduction hole, and the sub-discharge hole and selectively connecting the connection hole to the sub-introduction hole or the sub-discharge hole.

What is claimed is: 
     
         1 . A heat exchanger for a vehicle, comprising:
 a heat exchanging part including a plurality of introduction holes and discharge holes formed in one surface and other surfaces thereof to introduce and discharge respective working fluids, including a plurality of plates stacked therein to alternately form channels through which the respective working fluids flow, and heat-exchanging the respective working fluids passing through the respective channels with each other;   a bypass part connected to one of the plurality of introduction holes and protruding from one surface of the heat exchanging part in order to form a bypass channel which is connected to a sub-discharge hole in a sub-introduction hole, sub-discharge holes formed at both sides based on a connection hole formed at one side in one surface of the heat exchanging part and separated from the channels so that the working fluid bypasses the channels; and   a valve unit mounted at the connection hole, the sub-introduction hole, and the sub-discharge hole and selectively connecting the connection hole to the sub-introduction hole or the sub-discharge hole using linear displacement that is changed depending on a temperature of the working fluid introduced into the connection hole to introduce the working fluid into the channels or introduce the working fluid to the bypass channel, thereby controlling a flow direction of the working fluid.   
     
     
         2 . The heat exchanger for a vehicle of  claim 1 , wherein the introduction holes include a first introduction hole formed in one surface of the heat exchanging part and a second introduction hole formed at one side in the other surface of the heat exchanging part, and each of the discharge holes includes a first discharge hole formed in one surface of the heat exchanging part so as to correspond to the first introduction hole and a second discharge hole formed at the other side in the other surface of the heat exchanging part so as to correspond to the second introduction hole. 
     
     
         3 . The heat exchanger for a vehicle of  claim 2 , wherein the first introduction hole and the first discharge hole are formed at respective edge portions in a diagonal direction in one surface of the heat exchanging part. 
     
     
         4 . The heat exchanger for a vehicle of  claim 2 , wherein the second introduction hole and the second discharge hole are formed at positions spaced apart from each other, respectively, in a diagonal direction in the other surface of the heat exchanging part, and are formed so as to face the first introduction hole and the first discharge hole, respectively. 
     
     
         5 . The heat exchanger for a vehicle of  claim 2 , wherein the connection hole is formed so as to be connected to the second introduction hole in a state in which the connection hole penetrates through the heat exchanging part at a position corresponding to the second introduction hole. 
     
     
         6 . The heat exchanger for a vehicle of  claim 2 , wherein the sub-introduction hole is connected to one of the channels of the heat exchanging part, and the sub-discharge hole is connected to the second discharge hole through the bypass channel in a state in which the sub-discharge hole is not connected to the channel. 
     
     
         7 . The heat exchanger for a vehicle of  claim 2 , wherein the working fluids include a coolant introduced from a radiator and transmission oil introduced from a transmission. 
     
     
         8 . The heat exchanger for a vehicle of  claim 2 , wherein the heat exchanging part has the other surface mounted at one side of a transmission, circulates coolant through the first introduction hole and the first discharge hole, and circulates transmission oil through the second introduction hole and the second discharge hole. 
     
     
         9 . The heat exchanger for a vehicle of  claim 2 , wherein the respective channels include:
 first channels connected to the first introduction hole and the first discharge hole within the heat exchanging part and having coolant introduced therein through the first introduction hole and moved therein; and   second channels formed between the first channels so as to intersect with the first channels, connected to the second introduction hole and the second discharge hole within the heat exchanging part, and having transmission oil introduced therein through the second introduction hole and moved therein.   
     
     
         10 . The heat exchanger for a vehicle of  claim 1 , wherein the heat exchanging part allows the respective working fluids to flow in opposite directions to each other to heat-exchange the working fluids with each other. 
     
     
         11 . The heat exchanger for a vehicle of  claim 1 , wherein the valve unit includes:
 a housing having one end that is opened and having a first connection port, a second connection port, and a third connection port formed at one side thereof in a length direction, the first connection port being connected to the connection hole, the second connection port being connected to the sub-introduction hole, the third connection port being connected to the sub-discharge hole, and the second and third connection ports being formed at both sides based on the first connection port, respectively;   a fixing cap mounted at one end of the housing that is opened to close an inner portion of the housing;   a fixing rod having one end fixed to the fixing cap within the housing;   a deforming member inserted into the other end of the fixing rod and moving forward or backward on the fixing rod while being expanded or contracted therein depending on a temperature change of the working fluid in a state in which the deforming member is inserted so as to be slidable in the length direction within the housing; and   an elastic member interposed between the other end of the housing that is closed and the deforming member, and providing elastic force to the deforming member while being compressed at the time of rising depending on the expansion of the deforming member.   
     
     
         12 . The heat exchanger for a vehicle of  claim 11 , wherein the housing is formed in a cylindrical shape in which one end thereof is opened. 
     
     
         13 . The heat exchanger for a vehicle of  claim 11 , wherein the fixing cap has a mounting part formed integrally therewith at a center of one surface thereof facing the inner portion of the housing, the mounting part having the fixing rod mounted therein. 
     
     
         14 . The heat exchanger for a vehicle of  claim 11 , wherein the housing has a ring groove formed along a circumference of an inner peripheral surface of one end thereof that is opened in order to mount a fixing ring fixing the fixing cap. 
     
     
         15 . The heat exchanger for a vehicle of  claim 11 , wherein the deforming member is made of a wax material that is contracted and expanded therein depending on the temperature of the working material, and is inserted into the housing in a state in which an outer peripheral surface thereof contacts an inner peripheral surface of the housing. 
     
     
         16 . The heat exchanger for a vehicle of  claim 11 , wherein the elastic member is formed of a coil spring having one end supported by an inner surface of the other end of the housing that is closed and the other end supported by the deforming member.