KR100827329B1 - Stack type egr cooler - Google Patents

Abstract

A stack type EGR(Exhaust Gas Recirculation) cooler is provided to reduce the number of parts by using exhaust gas tubes and wave fins. A stack type EGR cooler(15) includes a plurality of exhaust gas tubes(80), a plurality of wave fins(90), a pair of side walls, duct-shaped left and right coolant adaptors(70,71), and a cover plate(40). Each exhaust gas tube is formed by coupling an upper plate(85) and a lower plate(86) for forming an exhaust gas passage. The exhaust gas tubes are stacked into a layer. The wave fins are fitted into the exhaust gas tubes, and extended from the right ends of the exhaust gas tubes and spaced apart from the left ends of the exhaust gas tubes. The side walls are spaced apart from each other on left and right ends of the exhaust gas tube, and extended in a lengthwise direction. The duct-shaped left and right coolant adaptors are arranged in the vicinity of left and right ends of the exhaust gas tube, and equipped with a coolant inlet port(73) or a coolant outlet port(74). The cover plate is arranged at the left side of the left coolant adaptor so as to close the left end of the exhaust gas tube.

Description

Stack type EGR cooler {Stack type EGR cooler}

1 is a schematic diagram showing the principle of an Exhaust Gas Reciculation (EGR) device.

2A is a perspective view of an EG cooler conventionally used.

FIG. 2B is a cross-sectional view of the A-A direction in FIG. 2A.

3 is a perspective view of a stack-type easy cooler according to the present invention.

4 is an exploded perspective view of the stack-type easy cooler according to the present invention.

5A and 5B are a front view and a right side view of a stacked easy cooler according to the present invention.

6A and 6B are perspective views each showing a wave fin according to the present invention.

7 is a perspective view showing an exhaust gas tube having a wave fin embedded therein according to the present invention.

8A is a perspective view of an exhaust gas tube according to the present invention.

8B is a right side view of the exhaust gas tube according to the present invention.

Figure 9a is a perspective view of the upper housing plate according to the present invention.

Figure 9b is a perspective view of the lower housing plate according to the present invention.

FIG. 10A is a schematic cross-sectional view taken along the line B-B in FIG. 3 and with the wave fins removed.

FIG. 10B is a schematic cross-sectional view taken along the direction of C-C in FIG. 3 with the wave fins removed.

* Brief Description of Drawings *

15 ... Stacked Easy Cooler

20 ... side wall 21 ... left end 22 ... right end

24 Subspace 25 Anterior subspace 26 Independent embossing

30 ... 1st plate on the left 31 ... Through hole 32 ... Through hole for wing

35 ... 2nd plate on the left 36 ... Through hole 37 ... Through hole for wing

38.Left outer auxiliary plate 38a ... Through hole

39.Left inner auxiliary plate 39a ... Through hole 39b ... Wing through hole

40.Cover plate 41 ... Bottom 42 ... Side

50 ... Right third plate 51 ... Through hole 52 ... Wing through hole

58.Right inside auxiliary plate 58a ... Through hole 58b ... Wing through hole

59.Right external auxiliary plate 59a ... Through hole

60 ... right 4th plate 61 ... through hole 62 ... wing through hole

65 ... right 5th plate 66 ... hole 67 ... fastening hole

68 ... vertical bulkhead

70 ... Left Coolant Adapter 71 ... Right Coolant Adapter 72 ... Bead

73 Coolant inlet 74 Coolant outlet

80 Exhaust gas tube 81 Left 82 Right

83 ... space

85.Top plate 85a ... Base 85b ... leg

85c ... wing 85d ... second leg

86.Bottom plate 86a ... base 86b ... leg

86c ... wing 86d ... second leg

87.Top housing plate 87a ... Base 87b ... Leg

88.Lower housing plate 88a ... Base 88b ... Leg

90 ... wave pin 91 ... waveform 92 ... channel

93 ... plate 94 ...

100..Bracket

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an exhaust gas reciculation (EGR) for supplying exhaust gas from an exhaust manifold to an intake manifold, and relates to a stack-type easy cooler for cooling and supplying the exhaust gas by cooling water. will be.

In general, an EZR device is a technique of recycling a part of the exhaust gas back to the intake system to increase the concentration of CO _{2 in} the intake air to lower the temperature of the combustion chamber and thereby reduce the NOx.

EZR device equipped with EZC cooler is a relatively small investment by installing a cooler (cooler) using engine coolant in a way to reduce NOx without increasing fuel economy and PM due to strict emission control of diesel engines. It is a device that can achieve the effect.

In this case, the EZR cooler should be cooled to 700 ℃ to 200 ℃, so it must be heat-resistant and must be compactly designed for installation inside the car. Condensation from exhaust gas during heat exchange, sulfuric acid in fuel, and condensate contain sulfuric acid, which is easy to cause corrosion. Therefore, the mechanical load acts due to the pulsation effect of exhaust gas. Since particulate matter (PM) of the exhaust gas can block the inside of the pipe, countermeasures against fouling are required.

In the related art, as shown in FIG. 1, the exhaust gas recirculation apparatus 1 recycles a part of the exhaust gas exhausted through the exhaust manifold 3 to the intake manifold 2 to reduce the generation of NOx. It is.

As shown in Fig. 1, a shell & tube type cooler 4 is installed in the exhaust gas recirculation path so that the exhaust gas can be supplied in a cooled state. The coolant of the engine 10 is used as the cell fluid, and the coolant flows in from the coolant inlet 7in and flows out to the coolant outlet 7out. Exhaust gas is used as the tube fluid, and the exhaust gas flows through the right conduit 6in extending from the exhaust manifold 3 and flows out to the left conduit 6out extending to the intake manifold 2. Reference numeral 11 in the drawings shows a combustion chamber.

The conventional easy cooler 4 used in Figs. 2A and 2B is shown. 1 is a double tube type and the EZ cooler shown in FIGS. 2A and 2B is a cell 1 pass and tube 2 pass type heat exchanger. The former and latter EZR coolers share the same reference numbers because they are roughly the same. However, the cover portion on the right side where the inlet and outlet of the exhaust gas is installed is not shown.

Cooling water flows in through the inlet 7in and flows out through the outlet 7out. Exhaust gas is introduced through the exhaust gas inlet (not shown), and the exhaust gas flowing out through the partition 12 extending into the cover (not shown) and the outgoing exhaust gas are distinguished, and the incoming exhaust gas is the exhaust gas. Passing through the tube (5in), the U-Flow Cap (13, U-Flow Cap) in a horizontal u-turn through the exhaust gas tube (5out), is discharged through the exhaust gas outlet (not shown). The discharged exhaust gas flows into the right conduit 6out connected to the intake manifold 2 of FIG.

By the way, the conventional Y-cooler U flow cap is made of a steel material and manufactured by a process such as deep drawing, and the deep drawing molding has to go through 6 to 7 steps such as a multi-stage press, and the manufacturing cost increases. there was. In addition, since the coolant does not flow inside the yuflow cap, an unnecessary portion is generated in which the exhaust gas is not cooled, and there is a problem of occupying only an internal installation space of the vehicle.

The present invention has been made to solve the above problems and the like, the object of the present invention is to remove blind spots in which the exhaust gas is not cooled in the easy cooler.

It is also an object of the present invention to provide a stacked easy cooler with improved performance, compact size, simplified components, low manufacturing cost and reduced fouling.

The present invention is used in an automobile exhaust gas recirculation device (EGR: Exhaust Gas Reciculation) for supplying the exhaust gas from the exhaust manifold to the intake manifold, the exhaust gas is cooled and supplied by the cooling water, the exhaust gas inlet, outlet An EG cooler comprising an installed cover and a partition wall for partitioning an inner space of the cover, the EG cooler comprising: a plurality of exhaust gas tubes formed by combining an upper plate and a lower plate so as to form an exhaust gas passage; The passages of the exhaust gas are sequentially partitioned in the front-rear direction so as to extend in the left-right direction, and are inserted into the exhaust gas tube to form a waveform, starting from the right end of the exhaust gas tube and extending from the left end of the exhaust gas to the right. A plurality of wave pins spaced apart from each other; A pair of side walls which are formed at both front and rear sides between the stacked exhaust gas tubes and spaced at left and right ends of the exhaust gas tube and extending in the left and right directions to form a cooling water passage; Installed near left and right ends of the exhaust gas tube, each having a cooling water inlet or a cooling water outlet and having a duct-shaped left and right cooling water adapter; A cover plate positioned on the left side of the left cooling water adapter and in contact with the left end of each of the exhaust gas tubes to seal the left end of each of the exhaust gas tubes; Include.

In addition, in a specific method of sealing the left and right cooling water adapters and a specific fastening structure with a cover in which an exhaust gas inlet and an outlet are installed, the left first plate may be configured to seal the left cooling water adapter. It is installed on the left side and the right side of the cover plate and has a plurality of through holes into which each of the exhaust gas tubes is inserted. The left second plate is coupled to the right side of the left coolant adapter and has a single through hole into which the entire exhaust gas tube is inserted; To seal the right coolant adapter, the right third plate is coupled to the left side of the right coolant adapter and has a single through hole into which the entire exhaust gas tube is inserted; The right fourth plate is coupled to the right side of the right coolant adapter and has a plurality of through holes into which each of the exhaust gas tubes is inserted; The right fifth plate is a flat plate and has one hole into which the entire exhaust gas tube is inserted, and a plurality of fastening holes are provided at the outside thereof and are assembled while surrounding the outside of the right cooling water adapter.

In addition, the bottom portion of the cover plate is in contact with the left side of the left first plate for simplifying the parts of the cover plate.

Also, the exhaust gas tube, the upper housing plate, the lower housing plate, the wave fin, the cover plate, the first left plate, the second left plate, the third right plate, the fourth right plate and the fifth right plate are preferable. Preferably it is SUS material.

Further, in the present invention, each of the side walls is formed by embossing outwardly from the upper and lower plates of each of the exhaust tube; Independent embossing is located between the sidewalls and protrudes outwardly from the upper and lower plates of each of the exhaust tubes. The side wall may be formed by the embossing of the upper plate and the lower plate, respectively, or by any of the embossing of the upper plate or the lower plate. The embossing is a separate part from the upper and lower plates, or preferably, the upper and lower plates are deformed by a press or the like method.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. In the front, rear, left and right directions, it is basically based on the case where the EZR cooler is positioned as shown in FIG. 3, and the left and right directions are about left and right directions in FIG. 3, and the up and down direction is about up and down directions in FIG. 3. The front-rear direction is the substantially front-rear direction of FIG. The front direction is the direction which protrudes substantially to the ground.

3 and 4 show a perspective view and an exploded perspective view of the stacked-type easy cooler 15 according to the present invention. Preferably, the stacked EZC cooler 15 is a cell 1 pass and tube 2 pass type heat exchanger.

Stacked EG cooler 15 of the present invention is largely exhaust gas tube 80, wave fin 90, a pair of side walls 20, left and right coolant adapters 70, 71, cover plate 40, It consists of a left first plate 30, a left second plate 35, a right third plate 50, a right fourth plate 60, and a right fifth plate 65, where the stack is stacked. type) means a structure that does not require a separate body cell surrounding the plurality of exhaust gas tubes 80 as the plurality of exhaust gas tubes 80 are stacked in a sealed manner with respect to the outside.

Basically, in the passage of the exhaust gas, the passage is formed by the combination of the exhaust tube upper plate 85 and the lower plate 86. The sealing on the left side is performed by the cover plate 40 and the left first plate 30. The sealing of the right side is performed by the said right 4th plate 60 and the right cover (not shown). Inside the right cover, a vertical bulkhead (not shown) is installed to partition back and forth therein, and an exhaust gas inlet (not shown) is installed in the rear part space and an exhaust gas outlet (not shown) in the front part space. ) Is installed.

In the passage of the cooling water, a separate body cell is not formed, and the space between the stacked exhaust gas tubes 80 is used as the cooling water passage. Front and rear sealing is performed by the side wall 20. The sealing on the left side is performed by the left first plate 30, the left second plate 35 and the left cooling water adapter 70. The sealing of the right side is performed by the right third plate 50, the right fourth plate 60 and the right cooling water adapter 71.

Specific exhaust gas passages and cooling water passages will be described with reference to the component parts, and finally described collectively.

As shown in Figs. 7 and 8A and 8B, the exhaust gas tube 80 preferably has a substantially rectangular cross section and preferably consists of an upper plate 85 and a lower plate 86 made of SUS material, The left and right ends (Figs. 7, 81 and 82) are open.

 The upper plate 85 of each of the exhaust gas tubes includes a base 85a, legs 85b, wings 85c, and a second leg 85d.

The base 85a is substantially flat and preferably embossed 20, 26 is formed on the outside (upper), so that the embossed 20 serves as a spacer and is described later. Likewise, when the exhaust gas tubes 80 are stacked, a passage for cooling water is formed.

The legs 85b are formed extending in the lower direction (FIGS. 8A and 8B) at both ends before and after the base 85a, and extend left and right to the left and right ends of the exhaust gas tube (FIGS. 7, 81, and 82). And to form the exhaust gas passage.

The wing 85c is formed to extend outward in the horizontal direction in each of the legs (85b) and to extend to the left and right ends 81 and 82 of the exhaust gas tube in the left and right longitudinal direction, Facilitate bonding of the lower plates 85 and 86 and enlarges the heat transfer area. Here, brazing is a kind of welding in which the base material is not damaged by adding a filler material below the melting point of the wool material to be joined at 450 ° C. or higher.

The second leg 85d extends downward in each of the wings 85c and is spaced apart from the left and right ends (Figs. 8A, 81, 82) of the exhaust gas tube (Figs. 8A, 21, 22). It extends in the longitudinal direction, and facilitates joining of the upper and lower plates 85 and 86 by brazing and enlarges the heat transfer area. Through the left and right spacing, the second leg 85d is not stored inside the left and right cooling water adapters 70 and 71, which will be described later, and is located outside, and simplifies the shape of the associated component.

Meanwhile, the lower plate 86 of each of the exhaust gas tubes includes a base 86a, a leg 86b and a wing 86c, and unlike the upper plate 85, there is no second leg.

The base 86a is substantially flat and preferably embossed 20, 26 is formed on the outside (bottom), and the embossed 20 acts as a spacer so that the exhaust gas tube 80 is described later. When stacked, it forms a passage for cooling water.

The legs 86b are formed to extend upwardly at both ends before and after the base 86a, and extend in left and right directions to the left and right ends of the exhaust gas tube (Figs. 7, 81, and 82). Form a passage.

The wing 86c is formed to extend outward in the horizontal direction in each of the legs (86b) and to the left and right ends (81, 82) of the exhaust gas tube is formed extending in the left and right directions, and the image by brazing, Facilitate bonding of the lower plates 85 and 86 and enlarges the heat transfer area.

As illustrated in FIGS. 5A and 5B, the exhaust gas tube 80 bonded to the brazing or the like thus starts from the right side of the right coolant adapter 71 and extends to the left side of the left coolant adapter 70 and is the exhaust gas. The left end (Figs. 5A, 81) of the tube is in contact with the right side of the bottom portion 41 of the cover plate so that the left end 81 of the exhaust gas tube is sealed. As a specific sealing method, assembly of a method of applying a compressive force to the exhaust gas tube 80 may be used, and an adhesive applied to the left end 81 of the exhaust gas tube may be used.

The exhaust gas tube 80 is stacked in a number of, for example, five, so that the substantially rectangular cross section after the cross section becomes the exhaust gas inlet (or inflow passage) by the method described below, and the square cross section before the cross section. It is an exhaust gas outlet (or outlet passage). By the exhaust gas tube 80 and the wave fin 90 to be described later, the number of single components constituting the stack-type easy cooler is reduced, the assembly process is simplified, and the unit cost and manufacturing cost of the product are reduced. In addition, due to the simplification of the shape, the workability is improved and the quality is improved. And, turbulence is easily formed, and countermeasures against fouling such as PM are easy.

The wave fin 90 is a plate on which a waveform 91 is formed, as shown in FIGS. 6A and 6B. A round type wave fin with rounded waveform 91 is shown in FIG. 6A and a square type wave fin with waveform 91 squared is shown in FIG. 6B. The period or pitch of the waveform is preferably 4.0 mm to 6.0 mm, and recesses or convex portions 94 are formed in the diaphragm 93 of the wave fins to enlarge the heat transfer area of the exhaust gas and to improve turbulence. Easily formed. Each valley of the wave fin 90 is used as a channel 92 through which exhaust gas flows by a method described below.

As shown in FIGS. 5A, 5B and 7, the wave fin 90 is embedded in the exhaust tube 80. In the built-in direction, preferably each of the diaphragm 93 divides the inside of the exhaust gas tube 80 into a front and rear space. As a result, a plurality of channels 92 formed by the diaphragm 93 and the exhaust gas tube 80 are formed in the longitudinal direction. In the forward and backward closure of the channel 92, preferably, the wave fin 90 and the exhaust tube 80 are assembled in a force fitting manner or adhesive or sealing material is attached to the acid portion of the wave fin 90. Can be. Even if it is somewhat less sealed, it is not a big problem since only mixing between exhaust gases occurs.

The wave fin 90 extends from the right end 82 of the exhaust tube 80 and extends rightward from the left end 81 of the exhaust tube 80 as shown in FIG. 7 in the left and right longitudinal directions. Spaced apart spaces 83, which are spaces generated by such spaces, are formed inside the exhaust tube 80 as shown in FIGS. 5A and 7. In the separation space 83, the exhaust gas flows out horizontally.

Now, the inflow and outflow of the exhaust gas will be described.

First, a right cover (not shown) is assembled on the right side of the right coolant adapter 71, and vertical partitions (not shown in FIGS. 5B and 68) are installed to partition the inside of the right cover back and forth. The exhaust gas tube 80 is divided into front and rear spaces 25 and 24 by the vertical bulkhead. The channel 92 of the wave fin located in the rear subspace 24 is preferably used as the inlet (or inlet passage) of the exhaust gas, and the channel of the wave fin located in the whole space 25 ( 92 is preferably used as an outlet (or outlet passage) of the exhaust gas.

Thus, the exhaust gas is introduced through the channel 92 of the wave fin located in the rear space 24, cooled by the coolant in the exhaust gas tube 80, near the left end of the exhaust tube 80 In the spaced space 83 is located in the horizontal U-turn is introduced into the channel 92 of the wave fins located in the whole space 25, is cooled by the coolant in the exhaust tube 80, Outflow from the channel 92 of the wave fin located in the subspace, the exhaust gas finally flows into the intake manifold (not shown).

On the other hand, as shown in Figures 4, 8a, 8b, a pair of side walls 20 are formed by embossing protruding outward to the upper, lower plates (85, 86) of each of the exhaust gas tubes to the front and rear sides. The upper and lower embossings are bonded, such as brazing, or the upper embossing is bonded to the base 86a of the lower plate, or the lower embossing is bonded to the base 85a of the upper plate.

The side wall 20 is spaced apart from the left and right ends 81 and 82 of the exhaust gas tube to form a left end spaced part (FIGS. 8A and 21) and a right end spaced part 22. The left end spaced part 21 and the right end spaced part 22 are accommodated in the left coolant adapter 70 and the right coolant adapter 71, respectively. Through this, the cooling water passages in the front and rear directions are sealed between the left and right cooling water adapters 70 and 71, and the cooling water passages in the front and rear directions are opened in each of the left and right cooling water adapters 70 and 71, It is connected to the installed coolant inlet, outlet 73, 74.

In addition, an independent embossing 26 is located between the sidewalls 20 and is embossed to protrude outward from the upper and lower plates 85 and 86 of each of the exhaust gas tubes, thereby allowing the cooling water to flow into the turbulence and conducting heat transfer. It enlarges its area and partially acts as a spacer.

Meanwhile, as shown in FIGS. 4 and 9A, the upper housing plate 87 is positioned on the upper part of the exhaust gas tube 80 stacked on the top thereof, and the side wall 20 of the exhaust gas tube formed at both front and rear ends is brazed. And the like to form a passage of cooling water. The upper housing plate 87 has a generally flat base 87a with or without embossing. An ideal leg 87b is formed at both ends of the front and rear downwards to facilitate brazing. The upper housing plate 87 is preferably only partially housed inside the left and right cooling water adapters 70 and 71.

The lower housing plate 88 is positioned at the lower portion of the exhaust gas tube 80 stacked on the lowermost portion and is coupled to the side wall 20 of the exhaust gas tube formed at both front and rear ends by brazing or the like to form a passage of cooling water. Lower housing plate 88 has a generally flat base 88a with or without embossing. An ideal leg 88b is formed upward and backward at both ends to facilitate brazing.

3, 4, and 5a, the left cooling water adapter 70 is preferably in the form of a square duct and, for example, a cooling water inlet 73 is installed on the side and near the left end 81 of the exhaust tube. And a cooling water inlet 73 between the cooling water passages between the exhaust gas tubes.

The right coolant adapter 71 is preferably in the form of a square duct and is provided with a coolant outlet 74 on the side, for example, near the right end 82 of the exhaust tube, so that the coolant passage between the exhaust tube and the coolant Connect the outlet 74.

The cooling water inlets and outlets 73 and 74 are preferably pipes made of SUS, and beads 72 are formed at upper and lower sides thereof, and either a parallel flow or a counterflow heat exchanger may be used.

As shown in Figures 4 and 5a, a preferred embodiment of a specific method of sealing the left and right ends of the left and right cooling water adapters 70 and 71 and a specific fastening structure with a cover in which an exhaust gas inlet and an outlet are installed, Explain.

The cover plate 40 is preferably in the form of a square lid to surround the outside of the left cooling water adapter 70 and fixed by brazing to seal the left end of the left cooling water adapter 70.

The cover plate 40 is preferably made of SUS and has a bottom portion 41 and a side surface 42, and has a low depth from an upper opening portion to a bottom portion 41, so that the exhaust gas has the left cooling water adapter. (70) in the separation space (Figs. 5a, 83) inside the exhaust gas tube and flows out horizontally. As a result, the cover plate 40 can be easily manufactured, and a blind spot where the occupied space is small and the exhaust gas is not cooled during installation is removed.

As shown in FIGS. 4 and 5A, the stacked EZL cooler 15 preferably has a left first plate 30, a left second plate 35, a right third plate 50, and a right fourth. The plate 60 and the right fifth plate 65 are included.

The left first plate 30 and the right fourth plate 60 fix and support the exhaust gas tube 20 and separate the passage of the cell from the passage of the tube. The left second plate 35 and the right third plate 50 seal the left and right sides of the left and right cooling water adapters 70 and 71. In addition, the right fifth plate 65 serves as a flange for assembling with a right cover on which a bypass valve or the like is mounted.

The left first plate 30 has a plurality of through holes 31 which are flat and preferably have a substantially rectangular shape, and each of the exhaust gas tubes 80 is inserted to fix the exhaust gas tubes 80. A wing through hole 32 is formed to insert upper and lower plate wings 85c and 86c of the exhaust gas tube. The part where the left first plate 30 and the exhaust gas tube 80 are in contact with each other is sealed by brazing or the like, and the part where the left side of the left first plate 30 and the left coolant adapter 70 are in contact with each other. It is sealed by brazing or the like so that the cooling water does not mix with the exhaust gas.

The left first plate 30 is preferably located between the left side of the left coolant adapter 70 and the cover plate 40 as shown in FIG. 5A.

The left second plate 35 is a flat plate and has one large through hole 36 in the center thereof so that the entire exhaust gas tube is inserted. A wing through hole 37 is formed to insert upper and lower plate wings 85c and 86c of the exhaust gas tube. The outer portion where the left second plate 35 and the exhaust gas tube 80 are in contact with each other is sealed by brazing or the like, and the right side of the left second plate 35 and the left cooling water adapter 70 are in contact with each other. It is also sealed by brazing or the like to prevent leakage of cooling water.

In order to prevent leakage of the cooling water, a left outer auxiliary plate 38 and a left inner auxiliary plate 39 are located at the left and right sides of the left second plate 35, respectively.

As shown in Figs. 4 and 5A, the left outer auxiliary plate 38 is a flat plate and has one large through hole 38a at the center thereof so that the entire exhaust gas tube is inserted.

In addition, the left inner auxiliary plate 39 preferably has an approximately angled cross-section extending in a rectangular donut shape, and has one large through hole 39a in the center, and has a wing through hole 39b. The entire exhaust tube is inserted.

The right third plate 50 is a flat plate and has one large through hole 51 in the center thereof, so that the entire exhaust gas tube is inserted. A wing through hole 52 is formed to insert upper and lower plate wings 85c and 86c of the exhaust gas tube. The outer portion where the right third plate 50 and the exhaust gas tube 80 are in contact with each other is sealed by brazing or the like, and the left side of the right third plate 50 and the right cooling water adapter 71 are in contact with each other. It is also sealed by brazing or the like to prevent leakage of cooling water.

In order to prevent leakage of the cooling water, the right inner auxiliary plate 58 and the right outer auxiliary plate 59 are located at the left and right sides of the right third plate 50, respectively.

As shown in Figs. 4 and 5a, the right inner auxiliary plate 58 is preferably formed by extending an approximately angled cross section in the form of a square donut, having a large through hole 58a in the center, and penetrating for a wing. With a hole 58b, the entire exhaust gas tube is inserted.

In addition, the right outer auxiliary plate 59 is a flat plate and has one large through hole 59a at the center thereof, and the entire exhaust gas tube is inserted therein.

The right fourth plate 60 has a plurality of through holes 61 which are flat and preferably have a substantially rectangular shape, and each of the exhaust gas tubes 80 is inserted to fix the exhaust gas tubes 80. A wing through hole 62 is formed to insert upper and lower plate wings 85c and 86c of the exhaust gas tube. A portion of the right side fourth plate 60 and the exhaust gas tube 80 which are in contact with each other is sealed by brazing or the like, and a portion of the right side of the right fourth plate 60 and the right side coolant adapter 71 abuts on each other. It is sealed by brazing or the like so that the cooling water does not mix with the exhaust gas.

The right fourth plate 60 is preferably located between the right side of the right coolant adapter 71 and the right fifth plate 65 as shown in FIG. 5A.

The right fifth plate 65 is a flat plate and preferably has a large hole 66 in the center thereof, and is assembled to the right coolant adapter 71 while surrounding the right outer side of the right coolant adapter 71. The right cooling water adapter 71 and the right fifth plate 65 are brazed to prevent leakage of cooling water or leakage of exhaust gas.

In addition, a plurality of fastening holes 67 are provided on the outer side of the right fifth plate 65 and screwed to the right cover where the exhaust gas inlet and the outlet are installed.

In addition, a vertical bulkhead 68 is installed on the right side of the right fifth plate 65 and connected to a vertical bulkhead (not shown) of the right cover to partition the internal space back and forth.

On the other hand, the bracket 100 is preferably bonded to the upper portion of the upper housing plate, to facilitate the mounting of the stack-type easy cooler 15.

The overall flow of cooling water and exhaust gas will be described below.

As shown in Figs. 5A, 5B, and 10A, the exhaust gas is used in the exhaust sub-space 24 which is divided by the vertical partition in the right cover (not shown), and the exhaust gas of the exhaust manifold of the engine is used. It is introduced through the channel 92 of the wave fin is located, is cooled by the coolant in the exhaust tube 80, the horizontal U-turn in the space 83 is located at the left end of the exhaust tube 80 The wave entering the channels 92 of the wave fins located in the front subspace 25, cooled by coolant in the exhaust tube 80, and located in the front space Out of the channel 92 of the fin, the exhaust gas finally flows into the intake manifold (not shown).

5A, 5B, and 10B, the coolant is a cell fluid and engine coolant is used and flows into the stacked EZR cooler 15 through the coolant inlet 73. The introduced coolant flows into the coolant passage between the exhaust gas tubes 80 having the layered layer in the left coolant adapter 70. The cooling water cools the exhaust gas while flowing from left to right along a passage formed by the inside gas tube 80 and the side wall 20. Cooling water flows into and merges with the right cooling water adapter 71 and flows out of the stacked EZ cooler 15 through the cooling water outlet 74.

The present invention has the effect of reducing the number of parts constituting the EG cooler, the assembly process is simplified, and the unit cost and manufacturing cost of the product by the exhaust tube and the wave fin having a built-in spaced space. In addition, due to the simplification of the shape, the workability is improved and the quality is improved. In addition, there is an effect that fouling (fouling) is reduced.

In addition, the present invention by the fastening structure of the cover plate and the left cooling water adapter, the exhaust gas is flowed out U-turn without leaving the body of the cell, the manufacturing of the cover plate is easy, the installation space is small, the exhaust gas is The effect is that blind spots that are not cooled are removed. Overall, the performance of the cooler is improved.

In addition, according to the present invention, the exhaust gas tube formed by the upper plate and the lower plate and the cell formed by the stack of the exhaust gas tube reduce the number of single components constituting the EG cooler, simplify the assembly process, The manufacturing cost is reduced.

Claims (7)

Used for automobile exhaust gas recirculation (EGR) that supplies exhaust gas from the exhaust manifold to the intake manifold, the exhaust gas is cooled and supplied by cooling water, and a cover provided with an exhaust gas inlet and an outlet. In the EZ cooler comprising a partition for partitioning the inner space of the cover, A plurality of exhaust gas tubes formed by combining the upper plate and the lower plate and stacked on each other to form an exhaust gas passage; The passages of the exhaust gas are sequentially partitioned in the front-rear direction so as to extend in the left-right direction, and are inserted into the exhaust gas tube to form a waveform, starting from the right end of the exhaust gas tube and extending from the left end of the exhaust gas to the right. A plurality of wave pins spaced apart from each other; A pair of side walls which are formed at both front and rear sides between the stacked exhaust gas tubes and spaced at left and right ends of the exhaust gas tube and extending in the left and right directions to form a cooling water passage; Installed near left and right ends of the exhaust gas tube, each having a cooling water inlet or a cooling water outlet and having a duct-shaped left and right cooling water adapter; A cover plate positioned on the left side of the left cooling water adapter and in contact with the left end of each of the exhaust gas tubes to seal the left end of each of the exhaust gas tubes; Stackable easy cooler comprising a. 2. The apparatus of claim 1, wherein the left first plate has a plurality of through holes installed on the left side of the left coolant adapter and on the right side of the cover plate to seal the left coolant adapter and into which each of the exhaust gas tubes is inserted; The left second plate is coupled to the right side of the left coolant adapter and has a single through hole into which the entire exhaust gas tube is inserted; To seal the right coolant adapter, the right third plate is coupled to the left side of the right coolant adapter and has a single through hole into which the entire exhaust gas tube is inserted; The right fourth plate is coupled to the right side of the right coolant adapter and has a plurality of through holes into which each of the exhaust gas tubes is inserted; The right fifth plate has a flat plate and has one hole into which the entire exhaust gas tube is inserted, and a plurality of fastening holes are provided at the outside thereof, and is stacked and assembled while surrounding the outside of the right cooling water adapter. Cooler. The stack type easy cooler of claim 2, wherein a bottom portion of the cover plate is in contact with a left side of the left first plate. 4. The apparatus of claim 3, wherein each of the sidewalls is formed by embossing outwardly from upper and lower plates of each of the exhaust tube;  Independent embossing is positioned between the sidewalls and is stacked protruding outwardly from the upper, lower plate of each of the exhaust tube tube. 5. An exhaust gas tube as claimed in claim 4, wherein an upper housing plate is positioned on top of the exhaust tube stacked on top and is coupled with sidewalls of the exhaust tube formed at both front and rear ends to form a passage of cooling water;  A lower housing plate is positioned below the exhaust gas tube stacked at the bottom and coupled with sidewalls of the exhaust gas tubes formed at both front and rear ends to form a passage of cooling water; Stackable easy cooler featuring. 6. The leg of claim 5, wherein the upper plate of each of the exhaust gas tubes extends in a downward direction at a base of the flat plate and at both ends before and after the base, and extends in a left and right length direction to the left and right ends of the exhaust gas tube. Wings extending outwardly in each of the legs in the horizontal direction and extending left and right to the left and right ends of the exhaust gas tube, and extending downwardly in each of the wings and the exhaust gas tubes. It comprises a second leg is formed extending in the left and right spaced apart from the left and right ends of the; The lower plate of each of the exhaust gas tubes is formed on a base of an approximately flat plate, and extends upwardly at both ends before and after the base and extends left and right to the left and right ends of the exhaust gas tube, respectively. And a wing extending outward in a horizontal direction and extending in left and right lengths to the left and right ends of the exhaust gas tube; Stackable easy cooler featuring. 7. The exhaust gas tube according to claim 6, wherein the cross section of the exhaust tube is approximately square in shape; Each through hole of the left first plate has a substantially rectangular shape, and the exhaust gas tube is inserted into the through hole individually; Each through hole of the right fourth plate has a substantially rectangular shape, and the exhaust gas tube is individually inserted into the through hole.

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