KR20020061692A - Water Cooling Heat Exchanger - Google Patents

Abstract

PURPOSE: A water-cooled heat exchanger is provided to improve efficiency of heat exchange in comparison with volume and assemblability thereof. CONSTITUTION: A heat exchanger comprises a plate-laminated structure(1) comprising an odd-numbered plate(13) having a joining part protrusively formed on an edge thereof, a first intake tank part and a first discharge tank part formed in the joining part to be separated from each other and a second intake tank hole and a second discharge tank hole protrusively formed to be separated from each other; an even-numbered plate(14) having a joining part protrusively formed on an edge thereof correspondingly with the odd-numbered plate, a first intake tank hole and a first discharge tank hole formed in the joining part correspondingly with the first intake tank part and a first discharge tank part of the odd-numbered plate and a second intake tank part and a second discharge tank part protrusively formed correspondingly with the second intake tank hole and the second discharge tank hole of the odd-numbered plate, all of which are alternately laminated and joined to each other, so that different fluids flow into a first intake tank(1a) formed by the first intake tank part and a second intake tank formed by the second intake tank part, pass through passages formed by the plates and are discharged to a first discharge tank formed by the first discharge tank part and a second discharge tank(1d) formed by the second discharge tank part to make the fluids exchange heat with each other.

Description

Water Cooling Heat Exchanger

The present invention relates to a water-cooled heat exchanger that cools or heats a cooled fluid by mutually exchanging a cooling water and a fluid to be cooled. In particular, a plate stack structure alternately forms a cooling water flow path and a cooled fluid flow path, and a heat dissipation area in each flow path. It relates to a high-efficiency water-cooled heat exchanger made through a heat dissipation fan to enlarge the.

Vehicles are equipped with several types of heat exchangers for cooling various types of cooling fluids, such as cooling water or refrigerants, such as radiators for cooling engine coolant or condensers for cooling refrigerant in air conditioners. According to the cooling fluid used to cool the fluid, it is divided into air cooling type using external air as gas as cooling fluid and water cooling type using cooling water as liquid as cooling fluid.

For example, the charge air cooler is charged in a turbo charger to cool the boosted air, thereby increasing the density of the charged air, which is reduced in density due to an increase in temperature as the pressure increases. An air-cooled heat exchanger is usually used to increase combustion efficiency and engine output. The oil cooler cools the oil lubricating the power transmission system of the vehicle to prevent the viscosity of the oil from rising due to the temperature increase, thereby reducing the mechanical viscosity. In order to prevent friction and abrasion, either air-cooled or water-cooled heat exchangers are selectively used.

On the other hand, conventional air-cooled heat exchangers used as a charge air cooler or an oil cooler use a low-heat transfer efficiency air as a cooling fluid and a cooling fluid (eg, supercharged air or oil) or a cooling fluid (for example, cooling water or an external heat exchanger). The heat dissipation fan, which is used to enlarge the heat dissipation area of the two fluids in order to increase the heat exchange efficiency between the air), is usually installed only in one of the flow path of the cooled fluid or the flow path of the cooling fluid, so that the heat exchange efficiency is low. There was this. In addition, in the case of the conventional water-cooled heat exchangers, the two fluids are formed through two flow paths respectively formed inside and outside the tube installed in the housing in order to increase the heat exchange efficiency between the cooling fluid (eg cooling water) and the cooled fluid (eg oil). The heat transfer efficiency is low because only one of the two flow paths is installed. The heat exchange efficiency is low, and the volume is increased due to the use of the housing. It has a problem in that the mounting is bad, the assembly is also very bad because the number of parts required.

Accordingly, the present invention solves the problems of the conventional air-cooled and water-cooled heat exchangers as described above, which is used for lubricating the charge air cooler or the power transmission system to cool the supercharged air supplied to the combustion chamber of the engine. It can be used as an oil cooler for cooling oil, etc., and consists of a plateless structure without a housing, and has an object of providing a water-cooled heat exchanger having a high heat exchange efficiency relative to a volume and greatly improving assemblability and having a low manufacturing cost.

1 is a perspective view of a water-cooled heat exchanger according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1. FIG.

3 is an odd plate plan view of a plate stack structure in a water-cooled heat exchanger according to an embodiment of the present invention.

4 is an odd plate planar view combined with the heat radiation in the water-cooled heat exchanger according to an embodiment of the present invention.

Figure 5 is an even plate plan view forming a plate laminated structure in a water-cooled heat exchanger according to an embodiment of the present invention.

6 is a plan view and a front view of the heat dissipation fan interposed on an even plate in a water-cooled heat exchanger according to an embodiment of the present invention.

7 is a plan view of the top plate and a cross-sectional view taken along line A-A of the water-cooled heat exchanger according to an embodiment of the present invention.

8 is a front view and a bottom view of the lower support of the water-cooled heat exchanger according to an embodiment of the present invention.

9 is a plan view of the upper support of the water-cooled heat exchanger according to an embodiment of the present invention.

10 is a perspective view of a water-cooled heat exchanger according to another embodiment of the present invention.

11 is a plan view and a front view of a water-cooled heat exchanger according to another embodiment of the present invention.

FIG. 12 is a cross-sectional view taken along the line II-XIII of FIG. 11. FIG.

13 is an odd plate plan view of a water-cooled heat exchanger according to another embodiment of the present invention, and a cross-sectional view taken along line B-B of the plan view.

14 is an even plate plan view of a water-cooled heat exchanger according to another embodiment of the present invention, and a C-C line sectional view of the plan view.

15 is a top view of the heat radiation of the water-cooled heat exchanger according to another embodiment of the present invention.

16 is a plan view of the bottom plate of the water-cooled heat exchanger according to another embodiment of the present invention.

Figure 17 is a plan view of the lower support of the water-cooled heat exchanger according to another embodiment of the present invention.

18 is a plan view of the upper support of the water-cooled heat exchanger according to another embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

1, 6: lamination structure of plates 2, 7: first inlet pipe

3, 8: first discharge pipe 4, 9: second inlet pipe

5, 10: second discharge pipe 11, 61: lower support

12, 62: upper support 13, 63: odd plate

14, 64: Even plates 15, 16, 66: Heat dissipation

17: upper plate 65: lower plate

130, 140: junction portion 131, 631: first inlet tank portion

132, 632: first discharge tank portion 133, 633: second inlet tank hole

134, 634: second discharge tank ball 135, 145: seating protrusion

141, 641: first inlet tank hole 142, 642: first outlet tank hole

143, 643: second inlet tank section 144, 644: second outlet tank section

1a, 6a: 1st inlet tank 1b, 6b: 1st discharge tank

1c, 6c: 2nd inlet tank 1d, 6d: 2nd outlet tank

13a, 63a: 2nd flow path 14a, 64a: 1st flow path

In the water-cooled heat exchanger according to the present invention, the joint is protruded along the edge, and the first inlet tank part and the first discharge tank part are formed at a distance from each other, and the second inlet tank hole and the second discharge tank hole are respectively formed in the joint part. An odd plate protruded from each other at a distance from each other, a junction portion protruded along an edge in a shape corresponding to the odd plate, and a first inlet of the odd plate corresponding to the odd plate, a first inlet corresponding to the discharge tank, Each of the discharge tank holes is formed, and the second inflow and discharge tank portions corresponding to the second inflow and outflow tank holes of the odd plate are formed in a plate stack structure in which the even plates, each protrudingly formed, are alternately stacked and then bonded to each other. The first inlet tank formed by the first inlet tank portion and the second inlet tank formed by 2 different fluids are introduced into the inflow tanks so that the respective fluids pass through the flow paths separated by the respective plates, and then the first discharge tanks formed by the first discharge tank parts and the second discharge tank parts The two fluids are mutually heat-exchanged by discharging through the second discharge tanks, respectively.

Water-cooled heat exchanger according to a preferred feature of the present invention further comprises a heat radiation interposed between each plate to enlarge the heat transfer area of each fluid flowing through the flow path between each plate.

In addition, the water-cooled heat exchanger according to a preferred feature of the present invention, the first inlet tank and the second inlet tank, and the first discharge tank and the second discharge tank are respectively located on the opposite side to each other flow direction of the two fluids It is configured to cross.

In addition, the upper and lower plates are bonded to the upper and lower portions of the laminated structure to increase the bonding strength of the laminated structure further comprises a lower plate.

In addition, the first inlet, the discharge pipe is joined to the opposite side to the plate laminated structure connected to the first inlet tank and the first discharge tank; The plate stacking structure further includes a second inlet and outlet pipes joined in the same direction and connected to the second inlet tank and the second outlet tank.

In addition, when the plates are made of an arc-shaped flat plate, the plate stacking structure may have a cylindrical shape to reduce the volume of the heat exchange performance.

Hereinafter, the configuration, operation and effects of the water-cooled heat exchanger according to the present invention will be described in detail.

1 is a perspective view of a water-cooled heat exchanger according to an embodiment of the present invention, Figure 2 is a cross-sectional view taken along line II-II of FIG.

The water-cooled heat exchanger according to an embodiment of the present invention shown in FIG. 1 is a substantially hexahedron manufactured to be used as a charge air cooler that increases the density by cooling the charge air supplied to the engine to improve combustion efficiency of the engine. As a heat exchanger of the type, the charge air cooler is configured to cool the charge air with coolant that cools the engine while circulating between the engine and the radiator.

As shown in FIG. 1, the charge air cooler of this embodiment forms a supercharged air flow path and a coolant flow path that are alternately formed therein, and the hexahedron which mutually heat-exchanges the two fluids by flowing the boost air and the coolant through the respective flow paths. Plate laminated structure (1), from the radiator (not shown) to introduce the coolant from the second inlet pipe (4), which is installed at the lower one side corner of the laminated structure (1), and from the turbocharger (not shown) The first inlet pipe (2) is installed on the upper portion of the laminated structure (1) to introduce the charge air, and the first inlet pipe (2) of the lower portion of the laminated structure (1) to discharge the charge air The first discharge pipe 3 is installed to be located on the opposite side, and the second discharge pipe 5 is installed to be located on the opposite side of the second inlet pipe 4 below the laminated structure (1) as a cooling water discharge passage. have.

As shown in the cross-sectional view of FIG. 2, the plate stacking structure 1 includes two types of plates 13 and 14 having heat dissipation characteristics between the upper support 12 and the lower support 11. 15 and 16, which are stacked to be alternately stacked with each other and then joined to each other by brazing, and therein, the charge air introduced through the first inlet pipe 2 flows to the first outlet pipe 3. The first flow path 14a of the double row to be made and the second flow path 13a of the double row to flow the coolant flowing through the second inlet pipe 4 to the second discharge pipe 5 are formed to alternate with each other. The laminated structure 1 cools the supercharged air flowing into the first flow passage 14a therein by heat exchange with the cooling water flowing into the second flow passage 13a.

3 and 5 show two kinds of plates forming the plate stacking structure 1, that is, the odd plate 13 and the even plate 14, and the odd plate 13 in which the heat dissipation fins 15 are accommodated. 6 shows a heat dissipation fan 16 accommodated in the even plate 14. FIG. 7 is a plan view of the upper plate 17 bonded to the upper part of the plate stacking structure 1 and a partial cutaway sectional view thereof, and FIG. 8 is bonded to the lowermost part of the plate stacking structure 1, respectively. A front view and a plan view of the lower support 11 connecting the first inlet pipe 2 and the like with respect to the tank are shown for each flow path formed inside the plate stack structure 1 while supporting the plate stack structure 1. FIG. 9 shows a plan view of the upper support 12 bonded to the upper plate 17 of the plate stack 1 to seal the first discharge tank 1b of the upper plate 17.

The plate shown in FIG. 3 is an odd plate 13 stacked in an odd order of the plate stacking structure 1, and as shown, the junction 130 is raised at the edge of the odd plate 13 and faces each other. Both sides of the corners are drilled in the center and the first inlet tank 131 and the first discharge tank 132 having a joining edge protruded, both sides of the first inlet, discharge tanks (131,132) and staggered In the second inlet and outlet tank holes 133 and 134 having a smaller diameter than the first inlet tank 131 is formed, respectively. And the mounting protrusion 135 is protruded downward in the inner portion of the junction portion 130.

In addition, the plate 14 illustrated in FIG. 5 is an even plate 14 alternately stacked with the odd plate 13 and bonded to the top and bottom surfaces of the odd plate 13, respectively, and at the edge thereof. As shown in the drawing, the junction 140 is raised and the first inflow, discharge tank portions 131 and 132 and the second inflow and discharge tank holes 133 and 134 of the odd plate 13 are located at the first inflow, Holes in the discharge tank holes (141, 142) and the center and the second inlet, discharge tank portions (143, 144) protruding while having a bonded border are formed, respectively. In addition, the even plates for the odd plates 13 are in contact with each of the seating projections 135 of the odd plate 13 as a counterpart when stacked at positions corresponding to the seating protrusions 135 of the odd plate 13. The mounting protrusions 145 that can hold the bonding position of 14) and increase the bonding force to the odd plate 13 are protruded upwardly.

The odd-numbered plate 13 and the even-numbered plate 14 are heat dissipation fins 15 of FIG. 4 each having a corrugated structure between the upper support 12 and the lower support 11, respectively, in the joint portions 130 and 140 on the upper surface thereof. And stacked while receiving the heat dissipation fin 16 of FIG. 6 and then bonded to each other through a brazing process to form the plate stack structure 1 as described above. The first inlet and outlet tank holes 141 and 142 of the inlet and outlet tank parts 131 and 132 and the even plate 14 form first inlet and outlet tanks 1a and 1b for introducing and discharging the charge air and the even plate. The second inlet and outlet tanks 143 and 144 of 14 and the second inlet and outlet tank holes 133 and 134 of the odd plate 13 are provided with second inlet and outlet tanks 1c and 1d for introducing and discharging cooling water. Form each. The first inflow tank 1a and the first discharge tank 1b are formed in the first flow path 14a in the junction 140 in which the even plates 14 are spaced apart from the lower surface of the upper odd plate 13. Are connected to each other through the second inlet tank (1c) and the second discharge tank (1d) are connected to each other by a second flow path (13a) formed by the upper surface of each odd plate (13), the first The first inlet pipe 2 of the upper support 12 is in the inlet tank 1a, and the first outlet pipe 3 of the lower support 11 is in the first outlet tank 1b, and the second inlet tank ( The second inlet pipe 4 and the second discharge pipe 5 of the lower support 11 are connected to 1c and the second discharge tank 1d, respectively. Meanwhile, as shown in FIG. 7, the upper plate 17 having only the first inlet tank part 171 and the first outlet tank part 172 is an odd plate 13 positioned at the top of the plate stacking structure 1. The upper inlet and outlet tanks 1c and 1d are bonded to each other, and the upper support 12 of FIG. 9 is joined to the upper plate 17 to seal the first discharge tank 1b and the plate stack structure. Supporting (1) suppresses the filling phenomenon of the plate laminated structure 1.

According to the configuration as described above, the water-cooled heat exchanger according to an embodiment of the present invention introduced the charge air introduced through the first inlet pipe 2 into the first inlet tank 1a to pass through the first flow passage 14a. Next, the discharge water is discharged to the first discharge pipe 3 through the first discharge tank 1b, and at the same time, the coolant introduced through the second inlet pipe 4 flows into the second inflow tank 1c to allow the second flow path 13a to flow through. The first flow passage 14a and the second flow passage formed between each plate 13 and 14 by discharged through the second discharge pipe 5 through the second discharge tank 1d while passing through The flows are staggered along each other along 13a) to mutually heat exchange them. At this time, the heat dissipation fins 15 and 16 interposed in each flow path increase the heat transfer area of each plate 13 and 14 of the fluid and allow the flows to cross each other to increase the heat exchange efficiency between the two fluids.

Such a water-cooled heat exchanger according to an embodiment of the present invention uses cooling water having high heat exchange efficiency as a cooling fluid, and heat dissipation fans 15 and 16 of each of the flow paths 13a and 14a have heat transfer areas of the cooling fluid and the cooled fluid. The heat exchange efficiency is very high compared to the volume. In addition, since the plate laminated structure (1) is made of a housing, there is an advantage that the assembly cost is greatly improved and the manufacturing cost is low.

10 is a perspective view of a water-cooled heat exchanger according to another embodiment of the present invention, and FIG. 11 is a sectional view taken along line II-XIII of FIG. 10.

The water-cooled heat exchanger according to another embodiment of the present invention cools the oil lubricating the power transmission system of the vehicle to prevent a decrease in viscosity of the oil due to the temperature rise, thereby preventing mechanical friction and wear caused by the decrease in oil viscosity. A heat exchanger having a substantially flat ring shape for use as a heat exchanger, the water-cooled heat exchanger is configured to cool oil with coolant for cooling the engine.

As shown in FIGS. 10 and 11, the water-cooled heat exchanger according to another embodiment of the present invention has a plate stack structure 6 for forming oil passages and cooling water passages alternately therein, and a first inlet for introducing and discharging oil. It consists of the pipe | tube 7 and the 1st discharge pipe | tube 8, the 2nd inflow pipe 9 which introduces and discharges cooling water, the 2nd discharge pipe | tube 10, etc.

As shown in the cross-sectional view of FIGS. 11 and 12, the plate stacking structure 6 includes two types of plates 63 and 64 corresponding to the upper support 62 and the lower support 61. 66) alternately stacked alternately with each other, and then joined to each other by brazing. A first flow path in a double row for flowing oil and a second flow path in a double row alternate with the first flow path are formed therein. The oil flowing in the first flow passage is cooled by heat exchange with the cooling water alternately flowing in the second flow passage.

13 and 14 illustrate two kinds of plates forming the plate stacking structure 6, that is, the odd plates 63 stacked in the odd order and the even plates 64 stacked in the even order. The top view of the heat dissipation fan 66 interposed between the plates 63 and 64 is shown. In addition, FIG. 16 illustrates a lower plate 65 that is stacked first among the plate stack structures 6, and FIG. 17 shows a plate stack 6 that is bonded to a bottom surface of the plate stack structure 6. Each tank 6a, 6b, 6c, which is formed inside the plate stack 6, while the lower support 61 is joined to the top of the plate stack 6 in FIG. A plan view of the upper support 62 connecting the inlet pipes 7, 9 and the discharge pipes 8, 10 with respect to 6d is shown.

The plate 63 shown in FIG. 13 is an odd plate 63 stacked in an odd order of the plate stacking structure 6, and as shown, the joints 630 are raised at their edges, and both sides face each other. A first inlet tank portion 631 and a first discharge tank portion 632 having a hole in the center and a joining edge (see 632a) are protruded at the end corners, and the first inlet and discharge tank portions 631 and 632 are formed. Second inlet and outlet tank holes 633 and 634 are formed at opposite corners, respectively, with holes having a smaller diameter than the first inlet and outlet tank parts 631 and 632.

In addition, the plate 64 illustrated in FIG. 14 is an even plate 64 alternately stacked with the odd plate 63 and bonded to the upper and lower surfaces of the odd plate 63, and the junction 640 is formed at an edge thereof. The first inlet, the discharge tank holes 641, 642 and the second inlet are raised at positions corresponding to the first inlet, the discharge tank parts 631,632 and the second inlet, the discharge tank holes 633,634 of the inner plate. Discharge tank portions 643 and 644 are formed, respectively. The second inflow and discharge tank portion 643 is protruded while having a hole in the center and having a joining edge 643a.

As can be seen from FIGS. 11 and 12, the odd plate 63 and the even plate 64 have a corrugated structure in the junction of the upper surface between the upper support 62 and the lower support 61, respectively. The first inflow and outflow of the odd-numbered plates 63 which are laminated while accommodating the heat dissipation fin 66 and then bonded to each other through a brazing process to form the plate stack structure 6 as described above. The first inlet and outlet tank holes 641 and 642 of the tank parts 631 and 632 and the even plate 64 form first inlet and outlet tanks 6a and 6b for introducing and discharging oil, and the odd plate 63 The second inlet and outlet tank holes 633 and 634 and the second inlet and outlet tank portions 643 and 644 of the even plate 64 respectively form second inlet and outlet tanks 6c and 6d for introducing and discharging the cooling water. The first inflow tank 6a and the first discharge tank 6b each include a first flow path 64a in the junction 640 in which the even plates 64 are spaced apart from the lower surface of the upper odd plate 63. The second inflow tank 6c and the second discharge tank 6d are connected to each other by a second flow path 63a formed by an upper surface of each odd plate 63. Each of the first and second inflow tanks 6a and 6c and the first and second discharge tanks 6b and 6d includes first and second inflow pipes 7 and 9 joined to the upper support 62. 1, 2 discharge pipes (8, 10) are connected. Meanwhile, as shown in FIG. 12, the lower plate 65 of FIG. 16 is stacked at the bottom of the plate stack structure 6 to seal the lower portions of the second inflow and discharge tanks 6c and 6d, and FIG. The lower support 61 is joined to the bottom surface of the lower plate 65 to seal the lower portion of the first inflow and discharge tanks 6a and 6b while supporting the plate stack structure 6 thereon. The upper support 62 of FIG. 18 is joined to the top of the plate stack 6 to support the plate stack 6 so as to suppress the filling phenomenon of the plate stack 6 and at the same time the inflow pipes 7 and 9. ) And discharge pipes (8, 10) are connected to the respective tanks (6a, 6b, 6c, 6d).

According to the above configuration, the water-cooled heat exchanger according to the exemplary embodiment of the present invention introduces oil introduced through the first inflow pipe 7 into the first inflow tank 6a so as to pass through the first flow path 64a. Next, the water is discharged to the first discharge pipe 8 through the first discharge tank 6b, and at the same time, the coolant introduced through the second inflow pipe 9 flows into the second inflow tank 6c and the second flow path 63a. The first flow path 64a and the second flow path 63a formed between the plates 63 and 64 by oil and the coolant are discharged through the second discharge pipe 10 through the second discharge tank 6d while passing through). Exchange heat between them by staggering the flow along each other. At this time, the heat dissipation fins 66 interposed in each of the flow paths 63a and 64a increase the heat transfer area of each plate 63 and 64 of the oil and the coolant to increase the heat exchange efficiency between the two fluids.

The water-cooled heat exchanger according to one embodiment of the present invention expands the heat transfer area of the oil, which is a cooling fluid, and the cooling water, which is a cooling fluid, in the heat dissipation fan 66 installed in each of the flow paths 63a and 64a. high. In addition, since the plate laminated structure 6 is made of a housing, there is an advantage in that assembly efficiency is greatly improved and manufacturing cost is low.

As used throughout the present specification, 'odd' and 'even' are terms used to distinguish two types of plates, and do not limit the stacking order and structure of each type of plate in the plate stacking structure.

As described in detail above, the water-cooled heat exchanger according to the present invention uses a coolant having a high thermal conductivity as a cooling fluid, and expands the heat transfer area of the cooling water and the fluid to be cooled in each flow path, as well as by turbulizing each fluid flow. Since the heat exchange efficiency between the two fluids is enhanced, the heat exchange efficiency is very high relative to the volume.

In addition, the water-cooled heat exchanger according to the present invention, as the plates laminated and bonded to each other while alternately forming the cooling fluid flow path and the flow paths of the cooled fluid alternately with each other, to isolate the housing for forming the flow path and the flow path. By eliminating the use of separate parts, there is an advantage that the assembly is very simple and the manufacturing cost is also very low.

Claims (6)

The joint is protruded along the edge, and the first inlet tank part and the first discharge tank part are formed at a distance from each other, and the second inlet tank hole and the second discharge tank hole are respectively protruded at a distance from each other. The odd plate and a joint portion protruded along an edge in a shape corresponding to the odd plate, and first inlet and outlet tank holes corresponding to the first inlet and outlet tank portions of the odd plate are formed in the joint portion, respectively. The second inflow and outflow tank portions corresponding to the second inflow and outflow tank holes of the odd plate are formed in a plate stack structure in which the even plates, each protrudingly formed, are alternately stacked and bonded to each other, thereby forming the first inflow tank portions. The second inlet tank formed by the first inlet tank and the second inlet tank portion guides different fluids. And the respective fluids are passed through the flow paths separated by the respective plates, and then through the first discharge tank formed by the first discharge tank parts and the second discharge tank formed by the second discharge tank parts. A water-cooled heat exchanger characterized in that the two fluids are mutually heat exchanged by discharging each. The method of claim 1, And a heat radiating heat interposed between the plates to enlarge the heat transfer area of each fluid flowing through the flow path between the plates. The method of claim 1, The first inlet tank and the second inlet tank, and the first discharge tank and the second discharge tank are respectively located opposite to each other so that the flow direction of the two fluids are configured to cross each other. . The method of claim 1, A water-cooled heat exchanger further comprises upper and lower supports joined to upper and lower portions of the plate stack structure to increase bonding strength of the stack structure. The method of claim 4, wherein First inlet and outlet pipes joined to opposite sides to the plate stack structure and connected to the first inlet tank and the first outlet tank; And a second inlet and outlet pipe connected to the plate stack structure in the same direction and connected to the second inlet tank and the second outlet tank. The method of claim 1, Each of the plates is an arc-shaped flat plate, the laminated structure of the water-cooled heat exchanger characterized in that the cylindrical.