Exhaust gas cooling device

Abstract

Exhaust gas cooling device, comprising: a plurality of heat exchange tubes (200) arranged to be spaced apart from one another at a predetermined distance in a lateral direction, having a height longer than a width, and containing an exhaust gas flowing therein; and a main plate (300) including a first connecting hole (310) to which one end of each of the heat exchange tubes (200) is attached, and a second connecting hole (320) to which the other end of each of the heat exchange tubes (200) is attached, wherein the heat exchanger tubes (200) include the following: a first surface section (211) including a first connecting section (215) projecting to a second side surface (250) by a predetermined length in a circumference, except for sections inserted into the first connecting hole (310) and the second connecting hole (320), below a first side surface (210) perpendicular to a width direction and circumference of the first side surface (210); and a second surface section (251) including a second connecting section (255) projecting to the first side surface (210) by a predetermined length in a circumference, except for the sections inserted into the first connecting hole (310) and the second connecting hole (320), under a second side surface (250) perpendicular to the width direction and a circumference of the second side surface (250), and a side surface of the second bonding section (255) and a side surface of the first bonding section (215) are arranged to be connected to each other, so that an exhaust gas flow path is formed between the first surface section (211) and the second surface section (251), where the first face (210) includes the following: a first flat section (220) extending along a longitudinal direction; a 1-1-th curved section (230) extending from one end of the first flat section (220) to the first connecting hole (310); and a 1-2-th curved section (240) extending from the other end of the first flat section (220) to the second connecting hole (320), and where the second face (250) includes the following: a second flat section (260) extending along the longitudinal direction; a 2-1 curve section (270) extending from one end of the second flat section (260) to the first connecting hole (310); and a 2-2-th curved section (280) extending from the other end of the second flat section (260) to the second connecting hole (320), such that each end section of the 1-1th curve section (230) and the 2-1th curve section (270) of the plurality of heat exchange tubes (200) is connected to a first connecting hole (310) and each end section of the 1-2th curve section (240) and the 2-2nd curve section (280) of the plurality of heat exchange tubes (200) is connected to a second connecting hole (320), wherein the first side surface (210) includes a plurality of first projections (225) that project in a direction opposite to the second side surface (250), and the second side surface (250) includes a plurality of second projections (265) that extend in a direction opposite to the first side surface (210), wherein an end section of the 1-1-th curve section (230), which is connected to the first connecting hole (310), projects in the same way as the first projection (225), an end section of the 1-2 curve section (240), which is connected to the second connecting hole (320), projects in the same way as the first projection (225), an end section of the 2-1 curve section (270), which is connected to the first connecting hole (310), projects in the same way as the second projection (265), and an end section of the 2-2 curve section (280), which is connected to the second connecting hole (320), projects in the same way as the second projection (265), and the end section of the 1-1th curve section (230) is arranged to be connected to the end section of the 2-1th curve section (270) of an adjacent heat exchanger tube (200), and the end section of the 1-2th curve section (240) is arranged to be connected to the end section of the 2-2nd curve section (280) of an adjacent heat exchanger tube (200), wherein the foreground end sections of the 1-1th, 1-2th, 2-1th and 2-2th curve sections (230, 240, 270, 280) are formed outside of longitudinal extensions of the first and second flat sections (220, 260), and wherein the coolant flows outside the heat exchange tubes (200) between the heat exchange tubes (200) along the longitudinal direction of the heat exchange tubes (200).

Description

[Technical field]

[0001] The present invention relates to an exhaust gas cooling device and more precisely to a heat exchanger used in an exhaust gas recirculation (EGR) cooler for lowering the temperature of an exhaust gas or in a waste heat recovery device for recovering heat from a high-temperature exhaust gas, which is designed to reduce flow resistance and improve heat exchange performance. [State of the art]

[0002] Generally, exhaust fumes from motor vehicles contain a large amount of harmful substances, such as carbon monoxide, nitrogen oxides, hydrocarbons, and the like. In particular, the higher the engine temperature, the greater the emission of harmful substances like nitrogen oxides. Nowadays, exhaust emission regulations are becoming stricter in every country. To comply with these stricter regulations, various devices are installed in vehicles to reduce harmful substances, such as nitrogen oxides, in the exhaust.

[0003] In particular, in the case of a vehicle equipped with a diesel engine, since the components of the burned fuel differ from those of a vehicle with a gasoline engine, a device such as a diesel particulate filter (DPF) or exhaust gas recirculation (EGR) system is installed. This system is used to meet emissions regulations by reducing harmful exhaust gases such as nitrogen oxides. Generally, the DPF collects particulate matter (PM) contained in the exhaust gas through a filter and then injects fuel into an exhaust pipe at the front of the filter to force the combustion of the particulate matter, thereby reducing exhaust emissions and regenerating the filter.

[0004] The EGR performs a function of reducing the emission of harmful substances such as nitrogen oxide and sulfur oxide by lowering the temperature of a combustion chamber by drawing in a portion of the vehicle's exhaust gas together with a mixer.

[0005] Additionally, an EGR cooler is now used to reduce the temperature of the EGR gas due to stricter regulations on atmospheric pollution worldwide. The exhaust gas flowing into the EGR cooler is cooled by a coolant (coolant) discharged through the engine.

[0006] A related technology is disclosed in Korean patent no. 0748756.

[0007] A conventional EGR cooler has a structure that includes a cooler body with a coolant inlet pipe and a coolant outlet pipe at both ends of it, and a multitude of gas tubes arranged parallel along a longitudinal direction within the cooler body, with a diaphragm valve provided on one side of the cooler body.

[0008] Therefore, high-temperature exhaust gas can be cooled by a circulation system in which the coolant supplied through the coolant inlet pipe exchanges heat with the exhaust gas flowing through the gas pipe in the radiator, and the heat-exchanged coolant is discharged through the coolant outlet pipe. Meanwhile, a waste heat recovery system for a vehicle is a device for recovering waste heat emitted after engine combustion in order to use the waste heat to warm the engine and transmission during an initial cold start of the vehicle, or to transfer the recovered heat energy to an air conditioning system to use the recovered heat energy to heat the vehicle's interior.

[0009] This means that when the waste heat recovery device is used, the coolant can be heated by using the high-temperature exhaust gas at the beginning of the start-up, and accordingly, there is an advantage that the engine preheating time can be shortened to improve fuel efficiency and reduce exhaust gas.

[0010] Additionally, pollutants emitted by the vehicle are largely discharged during idling, before the engine warms up, and these emissions can be further reduced by shortening the warm-up time through the use of the waste heat recovery system. Furthermore, the coolant heated by the waste heat recovery system quickly raises the temperature of the engine coolant and transmission oil to reduce friction in the engine and transmission, effectively improving fuel efficiency and providing a rapid warming effect in the interior during winter.

[0011] In particular, a heat exchanger in the waste heat recovery device, which performs a heat exchange between the coolant and the exhaust gas, strongly influences the performance of the waste heat recovery device.

[0012] However, the conventional EGR cooler or waste heat recovery device has a disadvantage: the shape and arrangement of the heat exchanger tube create high flow resistance, resulting in low heat exchange efficiency. Additionally, its complex structure makes assembly and mass production difficult.

[0013] Document DE 10 2009 047 620 A1 discloses a heat exchanger with a tube bundle and a separately designed heat exchanger tube. The heat exchanger tube is arranged in a separately designed closed housing through which a coolant flows. The coolant flows around the outside of the heat exchanger tube.

[0014] Document JP 2010-112 201 A discloses a U-turn type EGR cooler formed by closing its end face with a circular arc head designed in a circular arc shape, by arranging an inlet and outlet for exhaust gases parallel on the same end face of a square cylindrical shell to enclose a heat exchanger part.

[0015] Document KR 10 2017 0 048 022 A discloses an EGR cooler in which a gas pipe arranged inside a housing has a flat, longitudinally extending section, wherein at least one or more screwed sections are formed at positions corresponding to the flat section between an exhaust gas inlet and an exhaust gas outlet in a gas cover connected to the housing. [Revelation][Technical Problem]

[0016] One objective of the present invention is to provide an exhaust gas cooling device that is able to reduce flow resistance in a confined space and improve heat exchange performance. [Technical solution]

[0017] In a general aspect, the exhaust gas cooling device comprises the following: a plurality of heat exchanger tubes 200 arranged to be spaced apart from one another by a predetermined distance in a lateral direction, having a height longer than a width, and containing an exhaust gas flowing therein; and a main plate 300 comprising a first connecting hole 310 to which one end of each of the heat exchanger tubes 200 is attached, and a second connecting hole 320 to which the other end of each of the heat exchanger tubes 200 is attached.

[0018] The heat exchange tubes 200 can include a first side surface 210 perpendicular to a width direction; a second side surface 250 having the same shape as the first side surface 210 and arranged to be spaced apart from the first side surface 210 by a predetermined distance; and a connecting surface 290 formed by joining perimeters of the first side surface 210 and the second side surface 250, except for sections touching the first connecting hole 310 and the second connecting hole 320.

[0019] The heat exchanger tubes 200 include a first surface section 211, which includes a first connecting section 215, which projects to a second side surface 250 by a predetermined length, in a perimeter except sections which are inserted into the first connecting hole 310 and the second connecting hole 320 from a first side surface 210 perpendicular to a width direction and perimeter of the first side surface 210;and a second surface section 251, which includes a second binding section 255 projecting to the first side surface 210 by a predetermined length, in a perimeter except for the sections inserted into the first connecting hole 310 and the second connecting hole 320 from a second side surface 250 perpendicular to the width direction and a perimeter of the second side surface 250, and a side surface of the second binding section 255 and a side surface of the first binding section 215 are arranged to touch each other, such that an exhaust gas flow path is formed between the first surface section 211 and the second surface section 251.

[0020] The first side surface 210 includes a first flat section 220 extending along a longitudinal direction; a 1-1-th curved section 230 extending from one end of the first flat section 220 to the first connecting hole 310; and a 1-2-th curved section 240 extending from the other end of the first flat section 220 to the second connecting hole 320; and the second side surface 250 includes a second flat section 260 extending along a longitudinal direction; a 2-1-th curved section 270 extending from one end of the second flat section 260 to the first connecting hole 310; and a 2-2-th curved section 280 extending from the other end of the second flat section 260 to the second connecting hole 320.

[0021] The first side surface 210 includes a plurality of first projections 225 that project in one direction opposite the second side surface 250, and the second side surface 250 includes a plurality of second projections 265 that project in one direction opposite the first side surface 210.

[0022] An end section of the first projection 225 can be arranged to be in conjunction with an end section of the second projection 265 of an adjacent heat exchange tube 200, so that the coolant can flow between the first side surface 210 and the second side surface 250 of the adjacent heat exchange tube 200.

[0023] An end section of the 1-1 curve section 230, which is connected to the first connecting hole 310, projects in the same way as the first projection 225; an end section of the 1-2 curve section 240, which is connected to the second connecting hole 320, projects in the same way as the first projection 225; an end section of the 2-1 curve section 270, which is connected to the first connecting hole 310, projects in the same way as the second projection 265; and an end section of the 2-2 curve section 280, which is connected to the second connecting hole 320, projects in the same way as the second projection 265; and the end section of the 1-1 curve section 230 is arranged to be connected to the end section of the 2-1 curve section 270 of an adjacent heat exchanger tube 200; and the The final section of the 1st-2nd curve section 240 is arranged,to be in conjunction with the end section of the 2-2-th curve section 280 of an adjacent heat exchanger tube 200. Further features of the exhaust gas cooling device are defined in claim 1.

[0024] The first bonding section 215 or the second bonding section 255 can project as far as the width of an exhaust gas flow path.

[0025] The first connection hole 310 can include a variety of holes to which one end of each of the heat exchanger tubes 200 is inserted and fastened, and the second connection hole 320 can include a variety of holes to which the other end of each of the heat exchanger tubes 200 is inserted and fastened.

[0026] A heat-radiating fin 600 can be provided between the first side surface 210 and the second side surface 250.

[0027] The exhaust gas cooling device may further include an exhaust gas inlet section 410, which has one side coupled to the first connecting hole 310 and the other side through which the exhaust gas is introduced; and an exhaust gas outlet section 420, which has one side coupled to the second connecting hole 320 and the other side through which the exhaust gas is discharged.

[0028] The exhaust gas cooling device may further include a housing 100 formed to conform to an outer wall surface of a cylinder block 10 positioned outside a water jacket 11 of an internal combustion engine mounted in a vehicle and arranged on the outer wall surface of a cylinder block 10, and including a coolant inlet 110 and a coolant outlet 120, wherein the main plate 300 is mounted in the housing 100 to arrange the heat exchanger tubes 200 in the housing 100, and the coolant flows outside the heat exchanger tubes 200.

[0029] The exhaust gas cooling device can further include a housing 100 provided on an exhaust gas discharge line, and including a coolant inlet 110 and a coolant outlet 120 formed in an upper section of the housing 100, and an exhaust gas inlet 710 and an exhaust gas outlet 720 formed in a lower section of the housing 100, wherein the main plate 300 is mounted in the housing 100 such that the coolant flows above the main plate 300, on which the heat exchanger tubes 200 are arranged, and the exhaust gas flows below the main plate 300. [Beneficial effects]

[0030] Accordingly, the exhaust gas cooling device according to the present invention includes the plurality of heat exchanger tubes 200 which have a longer height than their width, thereby reducing the flow resistance of the cooling fluid.

[0031] Additionally, the length of the first flat section 220 is designed to be longer than the heights of the 1-1 curve section 230 and the 1-2 curve section 240, thus making it possible to completely reduce the flow resistance and increase the heat exchange area to maximize heat exchange performance.

[0032] Additionally, turbulence can occur in the coolant flowing on the outer surface of the heat exchanger tube 200 by forming the first projection 225 and the second projection 265, thereby improving the heat exchange performance.

[0033] Additionally, since the sections which are connected to the connecting holes in the first projection 225, the second projection 265 and the 1-1 curve section 230 to the 2-2 curve section 280 protrude, it is not necessary to form separate holes in the main plate 300, and the assembly can be carried out so that the exhaust gas does not escape to the outside.

[0034] In addition, the multitude of heat exchange tubes 200 including the first surface section 211 and the second surface section 251, the heat radiating fin 600 and the main plate 300 can be soldered together simultaneously to simplify assembly and mass production. [Description of the drawings] Fig. Figure 1 is a front view illustrating a condition in which an exhaust gas cooling device according to an exemplary embodiment of the present invention is mounted outside an engine cylinder. Fig. Figure 2 is a perspective exploded view of the exhaust gas cooling device according to the exemplary embodiment of the present invention. Fig. Figure 3 is a perspective view of the exhaust gas cooling device according to the exemplary embodiment of the present invention. Fig. Figure 4 is a perspective view of the exhaust gas cooling device according to the exemplary embodiment of the present invention. Fig. Figure 5 is a perspective exploded view of a heat exchanger tube of the exhaust gas cooling device according to the exemplary embodiment of the present invention. Fig. Figure 6 is a front view illustrating a condition in which an exhaust gas cooling device according to an unclaimed example is mounted on an exhaust gas discharge line. Fig. Figure 7 is a cross-sectional view along line AA' of Fig. 6. Fig. Figure 8 is a perspective view of the exhaust gas cooling device according to the example. Fig. Figure 9 is a perspective exploded view of a heat exchanger tube of the exhaust gas cooling device according to the example. [Description of reference numbers] 1 Exhaust gas cooling device 10-cylinder block 11 Water coat 100 cases 110 Coolant inlet 120 Coolant outlet 200 heat exchanger pipe 210 first side surface 211 first surface section 215 first binding section 220 first flat section 225 first lead 230 1st section of curve 240 1st-2nd curve section 250 second side surface 251 second surface section 255 second binding section 260 second flat section 265 second lead 270 2-1 section of curve 280 2-2nd section of curve 290 connection area 300 mainboard 310 first connecting hole 320 second connecting hole 410 Exhaust gas inlet section 420 Exhaust gas drainage section 500 seals 600 heat-radiating fins 700 Exhaust gas discharge line 710 Exhaust inlet 720 Exhaust outlet [Best Mode]

[0035] In the following, an exhaust gas cooling device according to the present invention is described in detail with reference to the accompanying drawings.

[0036] An exhaust gas cooling device 1 according to the present invention can be applied to a heat exchanger that uses exhaust gas, such as an EGR cooler, to lower the temperature of the exhaust gas, or to a waste heat recovery device to recover heat from a high-temperature exhaust gas. By way of explanation, as an exemplary embodiment of the present invention, an exhaust gas cooling device that can be applied to the EGR cooler is described, and as an unclaimed example, an exhaust gas cooling device that can be applied to a heat exchanger used in the exhaust gas cooling device is described.

[0037] As in Fig. 1 and Fig. As shown in Figure 2, in the exhaust gas cooling device 1 according to the exemplary embodiment of the present invention, a radiator main body is inserted into an engine block to allow a coolant flowing in the engine block to flow in the exhaust gas cooling device 1, thereby cooling the exhaust gas.

[0038] The exhaust gas cooling device 1 according to the present invention can be configured to include a housing 100, a heat exchanger 200 and a main plate 300.

[0039] The housing 100 is configured to include a coolant inlet 110 and a coolant outlet 120, and a space is formed within the housing 100 to receive the coolant introduced through the coolant inlet 110. Here, the coolant is generally a refrigerant, and other coolants can be used in addition to the refrigerant.

[0040] Here, as in Fig. As shown in Figure 1, the housing 100 is formed to match an outer wall surface of a cylinder block 10 which is positioned outside a water jacket 11 of an internal combustion engine in a vehicle, and is arranged to be in contact with the outer wall surface of the cylinder block 10.

[0041] The housing 100 can be formed as one piece with the engine block, and in this case, since the coolant inlet 110 and the coolant outlet 120 are not formed separately, the manufacturing time and manufacturing cost of the housing 100 of the EGR cooler 1 can be reduced by reducing one assembly process, and the space in which the EGR cooler 1 is installed in an engine compartment of the vehicle can be minimized.

[0042] A plurality of heat exchange tubes 200, in which the exhaust gas flows, are arranged to be spaced apart from each other at a predetermined distance in a lateral direction in the housing 100, and each of the heat exchange tubes 200 is formed to have a height longer than a width.

[0043] Additionally, the main plate 300 includes a first connection hole 310, to which one end of each of the heat exchange tubes 200 is attached, and a second connection hole 320, to which the other end of each of the heat exchange tubes 200 is attached. The first connection hole 310 and the second connection hole 320 are designed to correspond to the number of heat exchange tubes 200.

[0044] Here, the main plate 300, to which the heat exchanger tubes 200 are attached, is mounted in the housing 100, so that the exhaust gas flows through the multiple heat exchanger tubes 200 and the coolant flows in the housing 100 outside the heat exchanger tubes 200, cooling the exhaust gas flowing in the heat exchanger tubes 200 through heat exchange. The housing 100 and the main plate 300 can be coupled to each other by means of a bolt coupling.

[0045] Additionally, a seal 500 can be installed between the housing 100 and the main plate 300 to prevent coolant from leaking from the housing 100 to the outside. The seal 500 can be shaped to fit the surface where the housing 100 and the main plate 300 meet and can be connected to the housing 100 by a bolted connection or by welding.

[0046] As in Fig. 1, Fig. 2 to Fig. As shown in Figure 3, the heat exchanger tubes 200 of the exhaust gas cooling device 1 according to the present invention can include a first side surface 210 perpendicular to a width direction; a second side surface 250 having the same shape as the first side surface 210 and arranged to be spaced apart from the first side surface 210 by a predetermined distance; and a connecting surface 290 formed by joining circumferences of the first side surface 210 and the second side surface 250, except for sections touching the first connecting hole 310 and the second connecting hole 320, to form a height longer than a width.

[0047] This means that the heat exchanger tubes 200 have a cross-section with a hollow rectangular shape, in which the height is longer than the width. Therefore, according to the present invention, the heat exchanger tubes 200 are not stacked in a vertical direction, but in a horizontal direction, and since the coolant flowing from an upper section on one side of the heat exchanger tubes 200 can easily flow between the corresponding heat exchanger tubes 200, the flow resistance of the coolant is reduced and ultimately the heat exchange efficiency is improved.If, unlike the heat exchanger (200) of this invention, the tubes are used with a lower height than width, not many tubes can be stacked in the width direction, and therefore the coolant flowing from the upper section from one side of the tubes does not simply flow through each of the tubes, and due to the large area where the coolant comes into contact with the surface of the tubes, the flow resistance for the coolant to flow between the tubes is increased.

[0048] The heat exchanger tubes 200, which have the cross-section of the hollow rectangular shape as described above, can also be formed as follows. That is, as in Fig. 4 and Fig. 5 shown that the heat exchange tube 200 includes a first surface section 211 which includes a first connecting section 215 which projects to the second side surface 250 by a predetermined length, in a perimeter except sections which are inserted into the first connecting hole 310 and the second connecting hole 320 from the first side surface 210 perpendicular to a width direction and perimeter of the first side surface 210;and a second surface section 251, which includes a second binding section 255 projecting from the first side surface 210 by a predetermined length, to a perimeter except for the sections inserted into the first connecting hole 310 and the second connecting hole 320 from the second side surface 250 perpendicular to the width direction and a perimeter of the second side surface 250, wherein a side surface of the second binding section 255 and a side surface of the first binding section 215 are arranged to touch each other, so that an exhaust gas flow path can be formed between the first surface section 211 and the second surface section 251.

[0049] That is to say, in the case where the tube is formed by pressing from both sides, since it is difficult to bend both ends of the tube in order to attach the two ends of the tube to the first connecting hole 310 and the second connecting hole 320, the heat exchange tube which has a height longer than its width, according to the present invention, has the advantage that it is easily manufactured by forming a heat exchange tube which has a height longer than its width by overlapping the first surface section 211 and the second surface section 251 of the plate type which correspond to each other.

[0050] Additionally, if the heat exchanger tube 200 is formed by overlapping the first surface section 211 and the corresponding second surface section 251, the sections that touch each other are the first binding section 215 and the second binding section 255. The first binding section 215 can be on the outside and vice versa. The first binding section 215 and the second binding section 255, formed on the circumferences except for the sections inserted into the first connecting hole 310 and the second connecting hole 320, are bound together so that the exhaust gas in the heat exchanger tube 200 and the external coolant can flow to each other without leaking. In this case, the binding can be formed by brazing. Additionally, to maintain a constant inner width of the heat exchanger tube 200, the first binding section 215 or the second binding section 255 can project forward by the width of the exhaust gas flow path.If the first bonding section 215 is arranged outside the second bonding section 255, it is preferred that the second bonding section 255 projects forward by the inner width of the heat exchanger tube 200. In this case, the first bonding section 215, in conjunction with the second bonding section 255, extends by the projecting length, and the first bonding section 215 can be designed to project forward by a predetermined length to minimize leakage during brazing.

[0051] Additionally, to increase the heat exchange area between the heat exchanger tube 200 and the exhaust gas, and to improve heat exchange efficiency by creating turbulence, a heat-radiating fin 600 can be provided between the first side surface 210 and the second side surface 250. In this case, the heat-radiating fin 600 can be of a corrugated type, as shown in Fig. 4, and other shapes can also be used to increase the heat exchange area. In this case, the heat-radiating fin 600 can also be provided entirely between the first side surface 210 and the second side surface 250, or it can be formed only between a first flat section 220 and a second flat section 260, as described below, for ease of manufacture and assembly. Additionally, the heat-radiating fin 600 is soldered to the first side surface 210 and the second side surface 250 simultaneously and does not require a separate step.

[0052] The heat exchanger tube 200 is described in detail below.

[0053] First, the first side surface 210 can be formed to include a first flat section 220 extending along a longitudinal direction; a 1-1-th curved section 230 extending from one end of the first flat section 220 to the first connecting hole 310; and a 1-2-th curved section 240 extending from the other end of the first flat section 220 to the second connecting hole 320; and the second side surface 250 can be formed to include a second flat section 260 extending along a longitudinal direction; a 2-1-th curved section 270 extending from one end of the second flat section 260 to the first connecting hole 310; and a 2-2-th curved section 280 extending from the other end of the second flat section 260 to the second connecting hole 320.

[0054] The first flat section 220 has a rectangular cross-sectional shape perpendicular to the width direction and extends horizontally along the length direction of the housing 100. The first curved section 230 extends from one end of the first flat section 220 to the first connecting hole 310. Since one end of the first flat section 220 and the first connecting hole 310 are perpendicular to each other, the first curved section 230 has a shape that is bent at 90 degrees to connect the first flat section 220 and the first connecting hole 310. If a length of the first connecting hole 310 is shorter than a height of the first flat section 220, the first curved section 230 has a shape in which a length of the first curved section 230 is increased from the first connecting hole 310 to one end of the first flat section 220.This can be applied in the same way to the 1-1th curve section 230, the 2-1th curve section 270, and the 2-2th curve section 280. In general, when the first side surface 210 is considered in the vertical direction, the first side surface 210 and the second side surface 250 can be formed in a "C" shape.

[0055] If the exhaust gas flows between the 1-1 curve section 230 and the 2-1 curve section 270 in an upward direction from below one side of the heat exchanger tube 200, that is, the first connecting hole 310 of the main plate 300, and flows between the first flat section 220 and the second flat section 260 by changing direction in the longitudinal direction, the side sections of the 1-1 curve section 230 and the 2-1 curve section 270 can be formed in a round shape in the exhaust gas flow direction to have a predetermined curvature in order to allow the exhaust gas to flow as smoothly as possible and to reduce resistance. This can be applied in the same way to the 2-1 curve section 270 and the 2-2 curve section 280.

[0056] In this case, it is preferred that the length of the first flat section 220 is longer than the height of the first-1 curve section 230 and the first-2 curve section 240. This can be applied similarly to the second flat section, the second-1 curve section 270, and the second-2 curve section 280. By minimizing the flow resistance in the first-1 curve section 230 and the first-2 curve section 240, and increasing the length of the first flat section 220, which has good heat exchange performance, it is possible to completely reduce the flow resistance and increase the heat exchange area to maximize heat exchange performance.

[0057] The heat exchanger tube 200 of a plate-shaped stacked type according to the present invention as described above has a conventional gas box, a manifold and a heat exchanger section formed in one piece, and is easy to assemble and mass-produce, minimizing the leakage section and minimizing flow resistance, thereby ultimately improving the heat exchange performance.

[0058] Meanwhile, the first side surface 210 can include a plurality of first projections 225 that project in one direction opposite the second side surface 250, and the second side surface 250 can include a plurality of second projections 265 that project in one direction opposite the first side surface 210.

[0059] In this case, the first projections 225 and the second projections 265 can have different cross-sectional shapes such as a circle, an ellipse and a square, and can be arranged in a multitude of columns on the first side face 210 and the second side face 250 to be spaced apart at a predetermined distance from each other, and can also be arranged in a zigzag pattern.

[0060] Additionally, an end section of the first projection 225 is arranged to connect with an end section of the second projection 265 of an adjacent heat exchange tube 200, allowing the coolant to flow between the first side surface 210 and the second side surface 250 of the adjacent heat exchange tube 200. That is, since the heat exchange tubes 200 are spaced apart by the projecting length of the first projection 225 and the second projection 265, the coolant can flow between them. Therefore, the first projection 225 and the second projection 265 determine the distance between the heat exchange tubes 200 according to the degree of their projection, and accordingly, the flow resistance of the coolant and the number of heat exchange tubes 200 required can be determined.Additionally, the end sections of the first projection 225 and the second projection 265 are arranged to touch each other and are soldered together, so that the heat exchange tubes 200 can be formed in the form of a single module to simplify assembly and mass production. Furthermore, the first projections 225 and the second projections 264 can cause turbulence in the coolant flowing over the outer surface of the heat exchange tube 200, thereby improving heat exchange performance.

[0061] Meanwhile, an end section of the 1-1 curve section 230, which is connected to the first connecting hole 310, is positioned in the same way as the first projection 225, an end section of the 1-2 curve section 240, which is connected to the second connecting hole 320, is positioned in the same way as the second projection 265, an end section of the 2-1 curve section 270, which is connected to the first connecting hole 310, is positioned in the same way as the second projection 265, and an end section of the 2-2 curve section 280, which is connected to the second connecting hole 320, is positioned in the same way as the second projection 265.In this case, the end section of the 1-1 curve section 230 is arranged to be in conjunction with the end section of the 2-1 curve section 270 of the adjacent heat exchanger tube 200, and the end section of the 1-2 curve section 240 is arranged to be in conjunction with the end section of the 2-2 curve section 280 of the adjacent heat exchanger tube 200, so that the entire exhaust gas can be introduced into the heat exchanger tube 200 without leakage to the outside when the exhaust gas is introduced into the heat exchanger tube 200 in an upper direction from the first connecting hole 310 of the main plate 300.

[0062] This eliminates the need to create numerous separate holes for inserting and securing the heat exchanger tubes 200 into and to the main plate 300, nor does it require exhaust gas to escape to the outside. Additionally, as described above, the first projection 225 and the second projection 265 are arranged so that the projecting end section and an adjacent end section are positioned to touch each other and are soldered together, allowing the heat exchanger tubes 200 to be formed as a single module to simplify assembly and mass production.

[0063] The multitude of heat exchange tubes 200 including the first surface section 211 and the second surface section 251, the heat radiating fin 600 and the main plate 300 can be soldered together simultaneously to simplify assembly and mass production.

[0064] Meanwhile, the exhaust gas cooling device according to the present invention can further comprise an exhaust gas inlet section 410, which has one side coupled to the first connecting hole 310 and the other side through which the exhaust gas is introduced; and an exhaust gas outlet section 420, which has one side coupled to the second connecting hole 320 and the other side to which the exhaust gas is discharged.

[0065] The exhaust gas inlet section 410 has its other side, from which the exhaust gas is introduced, coupled to a lower section of the first connecting hole 310, so that the exhaust gas is moved to one side of the exhaust gas inlet section 410 and enters the heat exchanger tubes 200. As shown in Fig. 1, Fig. 2, Fig. 3 to Fig. As shown in Figure 4, the exhaust gas inlet section 410 is configured such that the cross-section on one side, into which the exhaust gas is introduced, is small, and the cross-section on the other side, to which the exhaust gas is discharged, is large to align with the first connecting hole 310. A curved surface can therefore be formed between the cross-section of one side and the cross-section of the other side to allow the exhaust gas to spread widely. The exhaust gas outlet section 420 has its other side coupled to a lower section of the second connecting hole 320, so that the exhaust gas is introduced from the heat exchanger tubes 200 and discharged onto one side of the exhaust gas outlet section 420.

[0066] In this case, the exhaust gas outlet section 420 can be formed in the same shape as the exhaust gas inlet section 410. Additionally, the angle can be varied depending on the installation direction of the exhaust pipe into which the exhaust gas is introduced. Furthermore, a flange 450 can be formed on the opposite side of the exhaust gas inlet section 410 and on the opposite side of the exhaust gas outlet section 420 to connect to the exhaust pipe.

[0067] Meanwhile, according to the exemplary embodiment of the present invention, the exhaust gas cooling device can further comprise a housing 100 formed to coincide with an outer wall surface of a cylinder block 10 positioned outside a water jacket 11 of an internal combustion engine mounted in a vehicle and arranged on the outer wall surface of a cylinder block 10, and including a coolant inlet 110 and a coolant outlet 120, in addition to the heat exchanger tubes 200 and the main plate 300. In this case, the main plate 300 is mounted in the housing 100 to accommodate the heat exchanger tubes 200 within the housing 100, and the coolant flowing outside the heat exchanger tubes 200 and the exhaust gas flowing within the heat exchanger tubes can exchange heat.

[0068] As in Fig. 6 and Fig. Figure 7 shows an exhaust gas cooling device 1 according to an unclaimed example provided on an exhaust gas discharge line 700 and can recover the heat of the exhaust gas introduced from the lower section of the housing with the cooling fluid introduced from an upper section of the housing through the heat exchanger tubes provided in the housing.

[0069] The exhaust gas cooling device 1 can be configured to include a housing 100, a heat exchanger tube 200 and a main plate 300.

[0070] The housing 100 has the form of a square box with an empty interior and can include a coolant inlet 110 formed in an upper section on one side thereof, a coolant outlet 120 formed in an upper section on the other side thereof, an exhaust gas inlet 710 formed in a lower section on one side thereof, and an exhaust gas outlet 720 formed in a lower section on the other side thereof. In this case, the flow direction of the coolant and the flow direction of the exhaust gas can be the same, but are preferably configured to be opposite to each other.

[0071] Since the housing 100 can be provided in the middle of the exhaust discharge line 700, it is easy to install the housing 100.

[0072] As in Fig. 6 and Fig. As shown in Figure 7, the main plate 300, to which the heat exchanger tubes 200 are attached, is mounted in the housing 100, and a section above the main plate 300, on which the heat exchanger tubes 200 are arranged, and a section below the main plate 300 are divided based on the main plate 300. In this case, a side surface of the main plate 300 and an inner surface of the housing 100 must be coupled together so that the exhaust gas and the coolant do not escape, and they can be coupled together by welding or brazing.

[0073] The coolant, introduced through the coolant inlet 110 of the upper section of the housing 100, flows outside the heat exchanger tubes 200, and the exhaust gas, introduced through the exhaust gas inlet 710 of the lower section of the housing 100, passes through the first connecting hole 310 of the main plate 300 and flows through the heat exchanger tubes 200, allowing the exhaust gas and the coolant to exchange heat. Additionally, to prevent the exhaust gas introduced through the exhaust gas inlet 710 of the lower section of the housing 100 from entering the first connecting hole 310 of the main plate 300 without entering the exhaust gas outlet 720 on the opposite side, a baffle may be provided on an inner surface of the lower section of the housing 100 and on a lower surface of the main plate 300. Alternatively, a shut-off valve that opens under a predetermined condition may also be installed.

[0074] A plurality of heat exchange tubes 200, in which the exhaust gas flows, are arranged to be spaced apart from each other at a predetermined distance in a lateral direction in the housing 100, and each of the heat exchange tubes 200 is formed to have a height longer than a width.

[0075] The heat exchanger tubes 200 of the exhaust gas cooling device can have the same properties as the heat exchanger tubes 200 according to the exemplary embodiment. Only the differences compared to the heat exchanger tubes 200 according to the exemplary embodiment are described below.

[0076] As in Fig. 8 and Fig. As shown in Figure 9, the heat exchanger tubes 200 are described in detail as follows, according to the example.

[0077] The first side surface 210 can include a plurality of first projections 225 that project in one direction opposite the second side surface 250, and the second side surface 250 can include a plurality of second projections 265 that project in one direction opposite the first side surface 210.

[0078] In this case, the first projections 225 and the second projections 265 can be formed on the 1-1 curve section 230 to the 2-2 curve section 280, as well as on the first flat section 220 and the second flat section 260. Additionally, the first projections 225 and the second projections 265 can also project inwards from the heat exchanger tubes. Because the exhaust gas flow direction is changed in the 1-1 curve section 230 to the 2-2 curve section 280, the first projections 225 and the second projections 265 project inwards from the heat exchanger tubes and are formed along the flow direction, thus making it possible to naturally change the exhaust gas flow direction.Meanwhile, unlike in the exemplary embodiment, in order to reduce the number of processing steps of the heat exchanger tubes 200, the end sections of the 1-1th curved section 230 to the 2-2nd curved section 280, which are connected to the connecting holes, cannot project like the projections. Instead, as in . Fig.As shown in Figure 8, the first connecting hole 310 of the main plate 300 includes a plurality of holes to correspond to the plurality of heat exchange tubes 200, and one end of each of the heat exchange tubes 200 is inserted into and secured to the corresponding hole, thus preventing the exhaust gas from escaping. This is applied to the second connecting hole 320 in the same manner. Meanwhile, the exhaust gas cooling device according to the example can further include a housing 100 provided on an exhaust gas discharge line and comprising a coolant inlet 110 and a coolant outlet 120 formed in an upper section thereof, and an exhaust gas inlet 710 and an exhaust gas outlet 720 formed in a lower section thereof.In this case, the main plate 300 is mounted in the housing 100, so that the coolant can flow over the main plate 300, on which the heat exchanger tubes 200 are arranged, and the exhaust gas can move under the main plate 300.

[0079] In the present invention, technical features of the exemplary embodiment not described in the example can also be applied to the example, and conversely, technical features of the example not described in the exemplary embodiment can also be applied to the exemplary embodiment. The present invention is not limited to the exemplary embodiments mentioned above, but can be applied in various ways. Furthermore, the present invention can be modified in various ways by those skilled in the field to which it relates, without departing from the core of the invention as claimed in the claims.

Claims

[1] Exhaust cooling device comprising: a plurality of heat exchange tubes (200) arranged to be spaced apart from one another at a predetermined distance in a lateral direction, having a height longer than a width, and containing an exhaust gas flowing therein; and a main plate (300) including a first connecting hole (310) to which one end of each of the heat exchange tubes (200) is attached, and a second connecting hole (320) to which the other end of each of the heat exchange tubes (200) is attached, wherein the heat exchanger tubes (200) include the following: a first surface section (211) including a first connecting section (215) projecting to a second side surface (250) by a predetermined length in a circumference, except for sections inserted into the first connecting hole (310) and the second connecting hole (320), below a first side surface (210) perpendicular to a width direction and circumference of the first side surface (210); and a second surface section (251) including a second connecting section (255) projecting to the first side surface (210) by a predetermined length in a circumference, except for the sections inserted into the first connecting hole (310) and the second connecting hole (320), under a second side surface (250) perpendicular to the width direction and a circumference of the second side surface (250), and a side surface of the second bonding section (255) and a side surface of the first bonding section (215) are arranged to be connected to each other, so that an exhaust gas flow path is formed between the first surface section (211) and the second surface section (251), where the first face (210) includes the following: a first flat section (220) extending along a longitudinal direction; a 1-1-th curved section (230) extending from one end of the first flat section (220) to the first connecting hole (310); and a 1-2-th curved section (240) extending from the other end of the first flat section (220) to the second connecting hole (320), and where the second face (250) includes the following: a second flat section (260) extending along the longitudinal direction; a 2-1 curve section (270) extending from one end of the second flat section (260) to the first connecting hole (310); and a 2-2-th curved section (280) extending from the other end of the second flat section (260) to the second connecting hole (320), such that each end section of the 1-1th curve section (230) and the 2-1th curve section (270) of the plurality of heat exchange tubes (200) is connected to a first connecting hole (310) and each end section of the 1-2th curve section (240) and the 2-2nd curve section (280) of the plurality of heat exchange tubes (200) is connected to a second connecting hole (320), wherein the first side surface (210) includes a plurality of first projections (225) that project in a direction opposite to the second side surface (250), and the second side surface (250) includes a plurality of second projections (265) that extend in a direction opposite to the first side surface (210), wherein an end section of the 1-1-th curve section (230), which is connected to the first connecting hole (310), projects in the same way as the first projection (225), an end section of the 1-2 curve section (240), which is connected to the second connecting hole (320), projects in the same way as the first projection (225), an end section of the 2-1 curve section (270), which is connected to the first connecting hole (310), projects in the same way as the second projection (265), and an end section of the 2-2 curve section (280), which is connected to the second connecting hole (320), projects in the same way as the second projection (265), and the end section of the 1-1th curve section (230) is arranged to be connected to the end section of the 2-1th curve section (270) of an adjacent heat exchanger tube (200), and the end section of the 1-2th curve section (240) is arranged to be connected to the end section of the 2-2nd curve section (280) of an adjacent heat exchanger tube (200), wherein the foreground end sections of the 1-1th, 1-2th, 2-1th and 2-2th curve sections (230, 240, 270, 280) are formed outside of longitudinal extensions of the first and second flat sections (220, 260), and wherein the coolant flows outside the heat exchange tubes (200) between the heat exchange tubes (200) along the longitudinal direction of the heat exchange tubes (200). [2] Exhaust gas cooling device according to claim 1, wherein the heat exchanger tubes (200) comprise the following: a first side surface (210) perpendicular to a width direction; a second side surface (250) which has the same shape as the first side surface (210) and is arranged to be spaced apart from the first side surface (210) at a predetermined distance; and a connecting surface (290) formed by connected perimeters except sections touching the first connecting hole (310) and the second connecting hole (320), under perimeters of the first side surface (210) and the second side surface (250). [3] Exhaust gas cooling device according to claim 1, wherein an end section of the first projection (225) is arranged to be in conjunction with an end section of the second projection (265) of an adjacent heat exchanger tube (200) so that the coolant can flow between the first side surface (210) and the second side surface (250) of the adjacent heat exchanger tube (200). [4] Exhaust gas cooling device according to claim 2, wherein the first binding section (215) or the second binding section (255) projects as far as the width of an exhaust gas flow path. [5] Exhaust gas cooling device according to claim 1, wherein the first connecting hole (310) includes a plurality of holes into which one end of each of the heat exchange tubes (200) is inserted and fastened, and the second connecting hole (320) includes a plurality of holes into which the other end of each of the heat exchange tubes (200) is inserted and fastened. [6] Exhaust gas cooling device according to claim 1, wherein a heat radiating fin (600) is provided between the first side surface (210) and the second side surface (250). [7] Exhaust gas cooling device according to claim 1, further comprising: an exhaust gas inlet section (410) which has one side coupled to the first connecting hole (310), and the other side through which the exhaust gas is introduced; and an exhaust gas discharge section (420) which has one side coupled to the second connecting hole (320), and the other side to which the exhaust gas is discharged. [8] Exhaust gas cooling device according to claim 1, further comprising a housing (100) provided on an exhaust gas discharge line and comprising a coolant inlet (110) and a coolant outlet (120) formed in an upper section of the housing (100), and an exhaust gas inlet (710) and an exhaust gas outlet (720) formed in a lower section of the housing (100), wherein the main plate (300) is mounted in the housing (100) such that the coolant flows over the main plate (300) on which the heat exchange tubes (200) are arranged, and the exhaust gas flows under the main plate (300).

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