JP2007309172A - Intercooler for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve assembly and disassembly properties of a cooling core arranged in a cooler case and improve sealing performance of a cooling water chamber in an intercooler of an internal combustion engine. <P>SOLUTION: A plurality of core insertion holes 45, 46, 47 and 48 are formed in an air passage 21 in a cooler case 20 including an air inlet 11 and an air outlet 10, and a plurality of independent cooling cores, in an embodiment, tow first and second cooling cores 30, 31 are inserted from each core insertion hole 45, 46, 47 or 48 and are arranged in the air passage 21 in a line in an air circulation direction. Also, independent cooling water chamber cover 53, 54, 55 or 56 are attached in each cooling core insertion hole 45, 46, 47 or 48, and cooling water chambers 60, 61, 62, 63, 64 and 65 communicating to cooling water channels of corresponding cooling cores 3, 31 are formed in each cooling water chamber cover 53, 54, 55 or 56. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an intercooler for an internal combustion engine in which a cooling core through which cooling water for air cooling flows is arranged in an air passage in a cooler case having an air inlet and an air outlet, and in particular, an internal combustion engine provided with a supercharger Related to intercooler suitable for.

  In an internal combustion engine equipped with an intercooler, if the amount of cooling water flowing through the cooling core hardly changes, it will be overcooled when the engine load is reduced, and the supply air temperature supplied to the combustion chamber will drop more than necessary. There is a risk of low-temperature corrosion such as defective combustion and cylinder components.

  As a countermeasure, conventionally, the cooling water passage in the intercooler is divided into a low-temperature cooling water circulation part and a high-temperature cooling water circulation part by a partition wall, and the flow rate of the low-temperature cooling water or the high-temperature cooling water is controlled according to the engine load. Alternatively, an intercooler that heats air in a low-load operation region by controlling the air flow has been developed.

  5 and 6 show an example of the conventional intercooler. In FIG. 5 showing a longitudinal sectional view, the cooler case 101 includes an air inlet 102 communicating with the pressurized air outlet of the supercharger 105, and a supply air supply. The air outlet 103 communicates with each combustion chamber via the air passage 106, and one cooling core 110 is disposed in the air passage 104 in the cooler case 101. The cooling core 110 is parallel to the support wall 111 and a pair of support walls 111 facing each other with the air passage 104 therebetween, a number of cooling water pipes 112 laid between the support walls 111 so as to cross the air passage 104. And a large number of plate-like cooling fins 113 arranged on the surface. On the peripheral wall of the cooler case 101, core insertion holes 115 facing each other with the air passage 104 interposed therebetween are formed, and the cooling water chamber cover 120 is formed on the cover mounting surface formed around each core insertion hole 115, respectively. , 121 are attached via gaskets 114.

  Each cooling water chamber cover 120, 121 is formed with a partition wall 120a, 121a at a substantially central portion in the air flow direction, whereby the cooling water chamber covers 120, 121 and the cooling core 110 are connected to the upstream side of the air passage. Are divided into a high-temperature cooling water circulation region C1 and a low-temperature cooling water circulation region C2 on the downstream side of the air passage. Further, in one of the cooling water chamber covers 120 (lower side in FIG. 5), the high-temperature cooling water circulation region C1 in the cooling water chamber cover 120 is divided into an inlet side cooling water chamber 132 and an outlet side cooling water chamber 133. A partition wall 134 and a partition wall 137 that partitions the low-temperature cooling water circulation region C2 into an inlet-side cooling water chamber 135 and an outlet-side cooling water chamber 136 are formed. Although not shown, each of the inlet side cooling water chambers 132 and 135 is connected to a high temperature cooling water supply pump and a low temperature cooling water supply pump. The other (upper side in FIG. 5) cooling water chamber cover 121 is partitioned by the partition wall 121a into an intermediate cooling water chamber 141 for high-temperature cooling water and an intermediate cooling water chamber 142 for low-temperature cooling water. ing.

  6 is a cross-sectional view taken along the line VI-VI in FIG. 5, and the cooling fin 113 (and the support wall 111 in FIG. 5) is formed in a rectangular shape as shown in the cross-sectional view in FIG.

  In the intercooler shown in FIGS. 5 and 6, the high-temperature cooling water pumped from the high-temperature cooling water supply pump enters the inlet-side cooling water chamber 132 in the region C <b> 1 and passes through the cooling water pipe 112 for the high-temperature cooling water on the opposite side. It reaches the intermediate cooling water chamber 141, turns back in the intermediate cooling water chamber 141, passes through the cooling water pipe 112, reaches the outlet side cooling water chamber 133, and is discharged.

  On the other hand, the low-temperature cooling water pumped from the low-temperature cooling water supply pump enters the inlet-side cooling water chamber 135 of the region C2, reaches the intermediate cooling water chamber 142 for low-temperature cooling water on the opposite side through the cooling water pipe 112, The intermediate cooling water chamber 142 is folded back, passes through the cooling water pipe 112, reaches the outlet side cooling water chamber 136, and is discharged.

  During high-load operation of the internal combustion engine, the compressed air that has been compressed by the supercharger 105 and becomes high temperature passes through the high-temperature cooling water circulation region C1 and the low-temperature cooling water circulation region C2 in the intercooler, It is cooled in stages and supplied to the supply passage 106.

During low-load operation of the internal combustion engine, the pressurization in the supercharger 105 is weak and the temperature rise is small. Therefore, air that has hardly increased in temperature is supplied into the intercooler. In this case, for example, by stopping the cooling water supply to the low-temperature cooling water circulation region C2, the cooling action in the low-temperature cooling water circulation region C2 is performed. Stop. Thereby, overcooling of the air is prevented, or the air is warmed with high-temperature cooling water, and the air is supplied to the air supply passage 106. In addition, there exists patent document 1 etc. as a prior art of the intercooler of an internal combustion engine.
JP 2003-056993 A

  When an intercooler as shown in FIGS. 5 and 6 is installed in, for example, a marine internal combustion engine, fresh engine cooling water is used as high-temperature cooling water, and running costs are reduced as low-temperature cooling water. Therefore, seawater may be used. In this case, the partition walls 120a and 121a are formed in the cooling water chamber covers 120 and 121, so that the cooling water chamber covers 120 and 121 are filled with cooling water chambers 132, 133, and 141 for fresh water and cooling water for seawater. When the chambers 135, 136, and 142 are partitioned, when the sealing performance of the cover mounting surface by the gasket 114 is insufficient, particularly when the mounting surfaces of the partition walls 120a and 121a are insufficiently sealed, There is a possibility that the cooling water may be mixed into the high-temperature cooling water of the fresh water. If the fresh water mixed with seawater flows to the water jacket or the like of the exhaust manifold as the cooling water of the internal combustion engine 1, it may cause corrosion of the cooling water passage or the like. Become.

  Moreover, since the intercooler shown in FIG.5 and FIG.6 forms the high temperature cooling water distribution area | region C1 and the low temperature cooling water distribution area | region C2 in the one cooling core 110, the weight of the cooling core 110 becomes large, When applied to a large intercooler for a ship, the weight becomes too large, and the cooling core 110 must be moved using a crane, resulting in a decrease in assembly and disassembly.

  In order to solve the above-mentioned problem, the invention according to claim 1 of the present invention is an internal combustion engine in which a cooling core through which cooling water for air cooling flows is arranged in an air passage in a cooler case having an air inlet and an air outlet. In the intercooler, a plurality of core insertion holes arranged in the air flow direction are formed on the peripheral wall of the cooler case, and independent cooling cores are inserted from the core insertion holes and disposed in the air passages. By attaching independent cooling water chamber covers that respectively cover the core insertion holes, cooling water chambers communicating with the cooling water passages of the corresponding cooling cores are formed in the respective cooling water chamber covers.

  According to the above configuration, a plurality of independent cooling cores are arranged in the air passage, and a cooling water chamber is formed by attaching a cooling water chamber cover to each cooling core. Even if a structure that distributes the water is used, there is no possibility of seawater being mixed into the fresh water. In particular, when the fresh water is used as cooling water for an internal combustion engine, there is no possibility of corrosion or deterioration of the water jacket or the cooling water passage by eliminating the problem of seawater contamination.

  In addition, since multiple independent cooling cores are arranged in one cooler case, the weight of each cooling core is lighter and easier to handle than the conventional structure in which one large cooling core is arranged. Becomes easier and disassembly and assembly are improved.

  According to a second aspect of the present invention, in the intercooler of the internal combustion engine according to the first aspect, each of the cooling cores is connected to a cooling water supply unit that supplies cooling water having different temperatures.

  According to the above configuration, the cooling water having different temperatures is distributed to each cooling core, and the cooling water supply stop control and the flow rate control are performed for each cooling core, so that the supply air temperature can be accurately adjusted according to the engine load situation. It can be adjusted to the optimum temperature.

  According to a third aspect of the present invention, in the intercooler of the internal combustion engine according to the first or second aspect, each core insertion hole is formed in a circular shape, and a plurality of cooling fins provided in the respective cores are also formed in a circular shape.

  According to the above configuration, the manufacture and assembly of the cooling core are facilitated, and an annular simple packing can be used as a seal for the mounting surface of the cooling water chamber cover, thereby reducing the cost of parts.

  1 to 4 are examples in which an intercooler according to the present invention is provided in a marine internal combustion engine, and has a structure in which two independent cooling cores 30 and 31 are arranged in a cooler case 20. FIG. 1 is a schematic view of an entire internal combustion engine. The internal combustion engine 1 is fastened to a cylinder block 2 having a plurality of cylinders, a crankcase 3 provided on the lower side of the cylinder block 2, and an upper surface of the cylinder block 2. The cylinder head 4 is provided, and an intake passage 5 built in the cylinder block 2 is connected to an intake port of each cylinder of the cylinder head 4.

  The air supply upstream side of the air supply passage 5 is connected to the air outlet 10 of the intercooler 6, and the air inlet 11 of the intercooler 6 is connected to the pressurized air outlet 13 of the exhaust turbocharger 7. The exhaust turbocharger 7 includes a turbine unit 15 and a compressor unit 16, and the turbine unit 15 communicates with the exhaust passage of the internal combustion engine 1 and is rotated by the pressure of the exhaust gas. The compressor unit 16 is connected to the turbine unit 15 via a turbine shaft, pressurizes air sucked from outside through an air supply duct and an air cleaner (not shown), and supplies the pressurized air to the intercooler 6 from the pressurized air outlet 13. To do.

  An air passage 21 that connects the air inlet 11 and the air outlet 10 is formed in the cooler case 20 of the intercooler 6. The first and second cooling air passages 21 are arranged in the air passage 21 in order from the upstream side of the air passage. The cores 30 and 31 are disposed independently. The first cooling core 30 on the upstream side of the air passage is for high-temperature cooling water, for example, and the cooling water inlet 32 is connected to a high-temperature cooling water supply pump 35 so that, for example, fresh water for cooling the internal combustion engine is supplied. Although not shown, the cooling water outlet 34 is connected to an exhaust manifold of the internal combustion engine 1 or a water jacket around the cylinder through a cooling water pipe or the like. The outlet of the water jacket or the like is connected to the high-temperature cooling water supply pump 35 through an appropriate cooling water passage to circulate fresh water for cooling the internal combustion engine.

  The second cooling core 31 on the downstream side of the air passage is, for example, for low-temperature cooling water, and the cooling water inlet 36 is connected to a low-temperature cooling water supply pump 37 so that, for example, seawater for cooling coolers is supplied. The cooling water outlet 38 is connected to a lubricating oil cooler or the like via a cooling water pipe or the like.

[Configuration of intercooler]
4 is an exploded longitudinal sectional view of the intercooler 6. The intercooler 6 includes the cooler case 20 having the air inlets 10 and 11 as described above, the first and second cooling cores 30 and 31 that are independent from each other, A pair of cooling water chamber covers 53, 54 for one cooling core 30 and a pair of cooling water chamber covers 55, 56 for the second cooling core 31 are configured. The cooler case 20 and the cooling water chamber covers 53, 54, 55, 56 are made of, for example, cast iron (FC material), and the cooling cores 30, 31 are made of copper or a copper alloy having good heat transfer efficiency.

  Both cooling cores 30 and 31 have the same structure so that they can be shared, a pair of parallel support walls 40 facing each other at a predetermined interval, and the support walls 40 are installed between the support walls 40. And a large number of cooling water pipes 41 extending substantially at right angles, and a large number of plate-like cooling fins 42 disposed between the supporting walls 40 in parallel with the supporting walls 40.

  On the peripheral wall of the cooler case 20, a pair of first core insertion holes 45, 46 facing each other across the air passage 21, the first core insertion holes 45, 46 are located on the downstream side of the air passage and are A pair of second core insertion holes 47 and 48 that are opposed to each other with the air passage 21 in between are formed in the same manner as the one core insertion holes 45 and 46. Each core insertion hole 45, 46, 47, 48 is formed in a circular shape, and the cooling fin 42 and the support wall 40 of each cooling core 30, 31 substantially correspond to the circular shape of the core insertion hole 45, 46, 47, 48. Further, the inner peripheral edge of the mounting surface of each cooling water chamber cover 53, 54, 55, 56 is also formed in a circular shape.

  The one of the cooling water chamber covers 53 for the first cooling core 30 (the lower side in FIG. 4) is formed with the high-temperature cooling water outlet 32 and the high-temperature cooling water inlet 34, and is substantially at the center in the air circulation direction. A partition wall 53a is formed in the cooling water chamber cover 53, thereby dividing the inside of the cooling water chamber cover 53 into an outlet side cooling water chamber 60 and an inlet side cooling water chamber 61. In the embodiment, the outlet side cooling water chamber 60 is formed on the upstream side of the air passage with respect to the inlet side cooling water chamber 61. A single intermediate cooling water chamber 62 is formed in the other cooling water chamber cover 54 for the first cooling core 30 (upper side in FIG. 4).

  The one of the cooling water chamber covers 55 for the second cooling core 31 (the lower side in FIG. 4) is formed with the low-temperature cooling water outlet 36 and the low-temperature cooling water inlet 38, and is substantially in the center of the air flow direction. A partition wall 55a is formed in the cooling water chamber cover 55, thereby dividing the inside of the cooling water chamber cover 55 into an outlet side cooling water chamber 63 and an inlet side cooling water chamber 64. In the embodiment, the outlet side cooling water chamber 63 is formed on the upstream side of the air passage with respect to the inlet side cooling water chamber 64. A single intermediate cooling water chamber 65 is formed in the other cooling water chamber cover 56 for the second cooling core 31.

  Between the flange portions of the cooling water chamber covers 53, 54, 55, 56 and the mounting surfaces around the core insertion holes 45, 46, 47, 48, annular gaskets 51, 52, 57, 58 are respectively provided. In particular, one of the gaskets 51 and 52 (the lower side in FIG. 4) has a seal portion 51a extending in the radial direction at a portion corresponding to the partition walls 53a and 55a of the corresponding cooling water chamber covers 53 and 55. , 57a are integrally formed.

  FIG. 2 is a longitudinal sectional view of the intercooler showing a state after assembly. As for the assembly order of the intercooler 6, first, the other cooling water chamber covers 54 and 56 are respectively connected to the gaskets 52 and 58, respectively. Are fixed to the cover mounting surface around the other core insertion holes 46 and 48 in an airtight state by bolts 70, and then the first and second cooling cores 30 and 31 are fixed to the one core insertion holes 45 and 47. Are inserted into the air passage 21 and finally, one of the cooling water chamber covers 53 and 54 is airtightly sealed by the bolt 70 on the cover mounting surface around the core insertion holes 45 and 47 via the gaskets 51 and 57, respectively. Fix it.

  In the assembled state, the first and second cooling cores 30 and 31 have the outer peripheral ends of the support walls 40 formed by the gaskets 51, 53 by the flange portions of the cooling water chamber covers 53, 54, 55 and 56, respectively. The first and second cooling cores 30 and 31 are fixed in a direction orthogonal to the air passage 21. Further, as described above, the seal portions 51a and 57a corresponding to the mounting surfaces of the partition walls 53a and 55a are formed on the gaskets 51 and 57 pressed by the cooling water chamber covers 53 and 55 (lower side in FIG. 2). Since it is formed, the seal portions 51a and 57a seal between the inlet-side cooling water chambers 61 and 64 and the outlet-side cooling water chambers 60 and 63.

  The cooling water pipe 41 at the downstream side portion of the air passage of the first cooling core 30 after the assembly crosses the air passage 21 from the inlet side cooling water chamber 61 to the intermediate cooling water chamber 62 to cool the upstream portion of the air passage. The water pipe 41 crosses the air passage 21 from the intermediate cooling water chamber 62 to the outlet side cooling water chamber 60. The cooling water pipe 41 in the downstream portion of the air passage of the second cooling core 31 crosses the air passage 21 from the inlet-side cooling water chamber 64 to the intermediate cooling water chamber 65, and the cooling water pipe 41 in the upstream portion of the air passage is The intermediate cooling water chamber 65 crosses the air passage 21 and reaches the outlet side cooling water chamber 63.

  3 is a cross-sectional view taken along the line III-III of FIG. 2, and arc portions 71 corresponding to the outer peripheral shape of the circular cooling fins 42 are formed on the end wall of the cooler case 20, respectively. Further, the cooling cores 30 and 31 are positioned at predetermined positions in the air passage 21 by fitting the outer peripheral ends of the cooling fins 42 together.

(Function)
In FIG. 1, during normal rated operation, air sucked from an air cleaner or the like is compressed in the compressor unit 16 of the exhaust turbocharger 7, and the temperature rises. The air is then cooled stepwise by the first cooling core 30 through which the high-temperature cooling water flows and the second cooling core 31 through which the low-temperature cooling water flows through the air passage 21 of the intercooler 6 from the air inlet 11. The gas is supplied from the outlet 10 through the air supply passage 5 to the combustion chamber of each cylinder.

  The cooling operation in the intercooler 6 will be described in detail. In FIG. 2, the high temperature cooling water supplied from the high temperature cooling water inlet 34 for the first core 30 to the inlet side cooling water chamber 61 by the high temperature cooling water supply pump 35. (For example, 70 ° C. to 80 ° C.) passes through the cooling water pipe 41 on the downstream half of the air passage of the first core 30, crosses the air passage 21, reaches the intermediate cooling water chamber 62, and turns back to air. The refrigerant passes through the cooling water pipe 41 on the upstream half of the passage to the outlet side cooling water chamber 60 and is discharged from the high temperature cooling water outlet 32. On the other hand, the hot pressurized air flowing from the air inlet 11 passes through the space between the cooling fins 42 of the first cooling core 30 and is cooled by exchanging heat with the high-temperature cooling water during that time. .

  Similarly to the operation of the first cooling core 30, in the second cooling core 31, low-temperature cooling water (for example, about 30 ° C.) pumped from the low-temperature cooling water supply pump 37 is supplied from the low-temperature cooling water inlet 38 to the inlet. Enters the side cooling water chamber 64, passes through the cooling water pipe 41 on the downstream half of the air passage of the second cooling core 31, crosses the air passage 21, reaches the intermediate cooling water chamber 65, and turns back to the upstream side of the air passage The refrigerant reaches the outlet side cooling water chamber 63 through the half cooling water pipe 41 and is discharged from the low temperature cooling water outlet 36. On the other hand, the air that has passed through the first cooling core 30 passes through the space between the cooling fins 42 of the second cooling core 31 and further exchanges heat with the low-temperature cooling water of seawater. It is cooled and supplied to the air supply passage 5 from the air outlet 10.

  When the internal combustion engine 1 is operated at a low load, the compression action by the exhaust turbocharger 7 in FIG. 1 is very weak, and the temperature rise of the air is extremely small. Therefore, air that is almost uncompressed and hardly rises in temperature is supplied into the intercooler 6. In this case, for example, by stopping the supply of the low-temperature cooling water to the cooling core 31, the cooling action by the second cooling core 31 is stopped, thereby preventing overcooling of the air, or conversely the first Air is warmed by the cooling core 30, and air is supplied to the air supply passage 5.

[Effects of the embodiment]
(1) The cooling water chamber covers 53 and 54 for the first cooling core 30 using the high-temperature cooling water and the cooling water chamber covers 55 and 56 for the second cooling core 31 using the low-temperature cooling water are independent of each other. In this state, since it is fixed to the cover mounting surface of the cooler case 21 via the gaskets 51, 52 and 57, 58, the low-temperature cooling water and the cooling water chambers 62, 65 and between the cooling water chambers 61, 63 There is no mixing with high-temperature cooling water. For example, when seawater is used as low-temperature cooling water, fresh water mixed with seawater is not supplied as engine cooling water to a water jacket of an internal combustion engine. Further, corrosion and deterioration of the surface of the water jacket and the cooling water passage of the internal combustion engine can be prevented.

(2) Since the first cooling core 30 and the second cooling core 31 are mounted in the air passage 21 of the cooler case 20 in an independent state, the cooling cores 30 and 31 are individually assembled and disassembled. As compared with the structure in which one large cooling core is arranged as in the conventional example of FIGS. 5 and 6, the weight of each cooling core 30, 31 is light and easy to handle, and disassembled and assembled. Improves.

(3) Since the cooling water supply stop control and the flow rate control can be performed for each of the high-temperature cooling water supply pump 35 and the low-temperature cooling water supply pump 37 for the cooling cores 30 and 31, it can be accurately performed according to the state of the engine load. The supply air temperature can be adjusted to an optimum temperature.

(4) The support walls 40 and the cooling fins 42 of the cooling cores 30 and 31 are formed in a circular shape, and the cover mounting surfaces of the cooling water chamber covers 53, 54, 55 and 56 are also formed in a substantially circular shape. , 57, 58 can be used in a simple annular shape, whereby the sealing performance can be maintained at a high level and the part cost can be reduced. Further, a commercially available O-ring can be used instead of the gasket.

[Other embodiments]
(1) Although the said embodiment is a structure which has arrange | positioned two cooling cores 30 and 31 in one cooler case 20, the structure which arrange | positions three or more cooling cores along the distribution direction of air, It is also possible to do.

(2) Although the above embodiment has a structure in which the cooling water inlets 34 and 38 of the cooling cores 30 and 31 are arranged downstream of the cooling water outlets 32 and 36, respectively. The cooling water inlets 34 and 38 of the cores 30 and 31 may be arranged upstream of the cooling water outlets 32 and 36 in the air passage.

(3) In the above embodiment, the high-temperature cooling water and the low-temperature cooling water are configured to reciprocate through the air passage 21, but the cooling water outlet is disposed on one side of the air passage and the cooling water inlet is on the other side. It is also possible to adopt a structure in which

(4) In the above embodiment, the first cooling core on the upstream side of the air passage is for high-temperature cooling water, and the second cooling core on the downstream side of the air passage is for low-temperature cooling water. It is also possible to use the first cooling core for low-temperature cooling water and the second cooling core downstream of the air passage for high-temperature cooling water.

  The present invention can be applied not only to a large-sized internal combustion engine for ships but also to an intercooler for a normal internal combustion engine.

It is the schematic of the internal combustion engine provided with the intercooler concerning the present invention. It is a longitudinal cross-sectional enlarged view of the intercooler of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 2. FIG. 3 is an exploded vertical sectional view of the intercooler of FIG. 2. It is a longitudinal cross-sectional view of the conventional intercooler. It is VI-VI sectional drawing of FIG.

Explanation of symbols

1 Internal combustion engine 6 Intercooler 7 Exhaust turbocharger 10 Air outlet 11 Air inlet 20 Cooler case 21 Air passage 30 First cooling core 31 Second cooling core 32 High temperature cooling water outlet 34 High temperature cooling water inlet 36 Low temperature cooling water outlet 38 Cooling water inlet 41 Cooling water pipe 42 Cooling fins 45, 46, 47, 48 Cooling core insertion holes 51, 52, 57, 58 Gaskets 53, 54, 55, 56 Cooling water chamber cover 62, 65 Intermediate cooling water chamber 60 Outlet Side cooling water chamber 61 inlet side cooling water chamber 62 intermediate cooling water chamber 63 outlet side cooling water chamber 64 inlet side cooling water chamber 65 intermediate cooling water chamber

Claims (3)

In an intercooler of an internal combustion engine in which a cooling core through which cooling water for air cooling flows is arranged in an air passage in a cooler case having an air inlet and an air outlet,
On the peripheral wall of the cooler case, a plurality of core insertion holes arranged in the air circulation direction are formed,
Insert an independent cooling core from each core insertion hole and place it in the air passage,
By attaching an independent cooling water chamber cover that covers each core insertion hole to each core insertion hole, a cooling water chamber communicating with the cooling water passage of the corresponding cooling core is formed in each cooling water chamber cover. An intercooler for an internal combustion engine.   The intercooler for an internal combustion engine according to claim 1, wherein each of the cooling cores is connected to a cooling water supply unit that supplies cooling water having different temperatures. Each core insertion hole is formed in a circular shape,
The intercooler for an internal combustion engine according to claim 1 or 2, wherein a plurality of cooling fins provided in each core are also circular.

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