DE10024389A1 - Exhaust gas heat exchanger has pairs of laminating plates each with protruding circumferential parts overlapping one another in laminating direction and connected by welding - Google Patents

Abstract

The heat exchanger includes a number of units each formed from a pair of laminating plates (131, 132) with one plate formed integral with a first protruding circumferential part (133) which extends in the laminating direction whilst the other plate is formed integral with a second protruding circumferential part (134) which extends in the other laminating direction so that the two protruding circumferential parts can overlap one another parallel to the laminating directions and the overlapped surfaces can be connected together through welding. A deformable thin metal plate is set between each of the connecting blocks and the first protruding part to connect the blocks to the laminating plates.

Description

The present invention relates to an exhaust gas heat exchange device for the exchange of heat between exhaust gases from internal combustion engines and Coolant, for example water, which in particular as a heat exchange device for cooling exhaust gas is to be used in exhaust gas recirculation tion systems (EGR = exhaust gas re-circulation system) is to be used.

EGR systems are used in vehicles for the recirculation of part of the Exhaust gas to a combustion chamber with the aim of reducing the Temperature of the combustion of fuel used, so the formation of Nitric oxide is limited. For this purpose, it is preferred that the EGR Gas with a lower temperature rezirku to the combustion chamber is gated.

In a conventional heat exchange device for gas described in JP-A-9-319 996 is shown, the passages for the exhaust gas consist of a variety of Heat transfer pipes (tubes), their opposite one another Longitudinal ends are connected with tube sheets in a cylindrical tube. However, it will ensure a higher heat capacity Exchange of the device preferred, inner fins in the exhaust gas passages or coolant penetration.

For this purpose, a heat exchange device for EGR gas of the type with a lamination plate with inner fins, as shown in Fig. 22, can be considered. In this device, a plurality of lamination plates, each of which is formed into a given shape by press work, are laminated so that the exhaust gas passages 110 and coolant passages 120 for water can be formed between the adjacent two plates. The inner ribs are provided in the exhaust gas passages 110 in a simple manner so that when the laminating plates are laminated piece by piece, the inner ribs on the respective laminating plates can be arranged at portions thereof that the exhaust gas passages 110 form.

If the thickness of the lamination plate is thinner, the heat exchange capacity of the device is further increased. It is therefore recommended that the thickness of the lamination plate be made thinner as far as the plate can withstand the pressure applied. If the lamination plates are connected by soldering in such a way that the respective end faces of the lamination plates (the respective cross-sectional areas of the lamination plates) come into contact with one another, the areas of the connection surfaces thereof are too small to ensure sufficient connection strength. Therefore, as shown in the circle X of Fig. 22, the respective lamination plates are partially bent outward to form peripheral surfaces which are perpendicular to the lamination direction of the lamination plates, and then become the respective peripheral surfaces by soldering to each other connected.

In the above gas heat exchange device, outer wall surfaces perpendicular to directions parallel to the plate surfaces of the respective lamination plates must have concave and convex areas, as shown in FIG. 22. However, it is preferable that an exhaust gas inlet 141 and an exhaust gas outlet 142 are respectively opened on the outer wall surfaces perpendicular to the lamination directions of the lamination plates; since the exhaust gas passages and the coolant passages extend parallel to the plate surfaces of the lamination plates, it is quite difficult, due to the presence of the concave and convex areas, to solder by means of soldering terminal blocks 143 , the exhaust gas inlet 141 and the exhaust gas Connect outlet 142 to outer conduits to attach to the outer wall surfaces perpendicular to the lamination directions of the lamination panels.

On the other hand, in a case where the exhaust gas inlet 141 and the exhaust gas outlet 142 on the outermost plate surface of the lamination plates are opened in parallel with the exhaust gas passages, as shown in FIG. 22, the flow direction of the EGR is -Gas forced to change by an angle of 90 ° in the vicinity of inlet 141 and outlet 142 . This causes the problem that the pressure loss of the EGR gas is very large and the flow amount of the EGR gas is reduced.

The present invention is in view of the problems stated above and an object of the present invention is to provide a  Exhaust gas heat exchange device with a higher capacity of the To create heat exchange.

To achieve these objects, the apparatus consists of a plurality of units, each of which is formed from a pair of lamination plates 131 , 132 that are laminated and soldered together, exhaust gas passages 110, and coolant passages 120 that are provided between each two adjacent lamination plates 131 , 132 , of inner ribs 111 , which are arranged on at least one of the exhaust gas passages 110 and the coolant passages 120 , of an exhaust gas inlet 141 and an outlet 142 , which on opposite sides the exhaust gas passages 110 are arranged, and a pair of connecting blocks 143 which are connected to the lamination plates 131 , 132 at the exhaust gas inlet 141 and the outlet 142 for connecting external lines 210 to the exhaust gas passages 110 , so that Exhaust gas perpendicular to the lamination directions of the lamination plates 131 , 132 from one of the blocks of the pair the connecting blocks 143 flows out through the exhaust gas inlet 141, through the exhaust passages 110 and through the exhaust outlet 142 through to the other block of the pair of the terminal blocks 143rd

In the above device, one of the lamination plates of the pair of lamination plates 131 of any of the units is integrally provided with a first protruding peripheral part 133 extending in a lamination direction of the lamination plates 131 , 132 , and the other lamination plate of the pair of lamination plates 132 is integrally formed with a second protruding peripheral part 134 , which extends in the other lamination direction of the lamination plates 131 , 32 , so that the first and the second protruding circumferential part 133 , 134 can overlap one another parallel to the lamination directions of the lamination plates 131 , 132 and the overlapped surfaces 133 a , 134 a of the respective first and second projecting peripheral part 133 , 134 can be connected to one another by soldering.

As a result, the lamination plates 131 , 132 can be connected with sufficient bonding strength without forming outward-curved peripheral surfaces perpendicular to the lamination directions thereof. Further, the outer wall surfaces of the laminated plates 131 , 132 parallel to the lamination directions thereof (hereinafter referred to as outer wall connection surfaces) become flat without the concave and convex regions, so that the terminal blocks 143 can be easily and firmly attached to the outer wall connection surfaces by soldering . Furthermore, even if the device has inner fins 111 in the exhaust gas passages 110 to improve the efficiency of the heat exchange, the exhaust gas in the device flows almost linearly from the inlet 141 to the outlet 142 , so that the pressure loss of the exhaust gas is reduced can be.

The outer wall connection surfaces may have relatively large concave and convex areas due to fluctuations in the manufacture and assembly of the lamination plates 131 , 132 . On the other hand, there may be another case where the joining surfaces of the terminal blocks are bent 143 by shrinkage of the joining surfaces of the terminal blocks 143 in a soldering to the same, and are formed relatively large gaps between the outer wall connection faces and the connection faces of the terminal blocks 143, thus resulting in a insufficient connection of the terminal blocks 143 with the outer wall connecting surfaces.

Therefore, it is preferable that a deformable thin metal plate 144 is disposed between each of the terminal blocks 143 and the first protruding peripheral part 133 , and each of the terminal blocks 143 is connected to the lamination plates 131 , 132 via the deformable thin metal plate 144 . In this case, the thin metal plate 144 performs the function of a seal (a packing), so that the connection surfaces of the connection block 143 and the outer wall connection surface can be attached to the metal plate 144 in order to limit the gaps between them. As a result, the terminal block 143 is reliably connected to the outer wall connection surface via the metal plate 144 by soldering.

Preferably, the deformable, thin metal plate 144 is equipped on its circumference with a wall surface 144 a, which extends in the lamination directions of the lamination plates 131 , 132 . The wall surface 144 a serves as a guide plate for easy alignment and alignment of the blank lamination plates 131, 132 when the lamination plates 131 are stacked 132nd

It is further preferred that the outermost lamination plates 135 , 136 are equipped at their opposite ends with circumferential surfaces 135 a, 136 a, which extend parallel to the lamination directions of the lamination plates 131 , 132 and the directions spaced apart from one another . By connecting the respective connection blocks 143 to the peripheral surfaces 135 a, 136 a, a higher connection strength of the connection blocks 143 on the lamination plates 131 , 132 can be ensured.

Furthermore, each of the connection blocks 143 is preferably equipped with a through hole 143 a, which is connected to the exhaust gas passages 110 , and the bottom-most inner surface 143 b of the through hole 143 a of at least one of the connection blocks 143 is in one position located lower than the deepest inner surface of the exhaust gas passages 110 , so that water to which moisture in the EGR exhaust gas has condensed can be discharged from the exhaust gas passages 110 .

Other features and advantages of the present invention and methods of Operating and the function of the associated parts result from one Study the following detailed description, the appended claims and of the drawings that form part of this application. In the drawings demonstrate:

Fig. 1 is a schematic view of an EGR system;

Fig. 2 is a plan view of an exhaust gas heat exchange device according to the first embodiment of the present invention;

3 shows a section along the line III-III in Fig. 2.

Fig. 4 is a section along the line IV-IV in Fig. 2;

Fig. 5 is an enlarged view of a circle marked with A of Fig. 4;

Fig. 6 is a section along the line VI-VI in Fig. 2;

7A is a plan view of a lamination plate of a pair of lamination plates.

Fig. 7B is a section along the line VIIB-VIIB in Fig. 7A

8A is a view of the laminator other of the pair of the lamination plates.

8B is a sectional view taken along line VIIIB-VIIIB in Fig. 8A.

9A is a plan view of a lamination plate of another pair of the lamination plates.

Fig. 9B is a section along the line IXB-IXB in Fig. 9A;

10A is a plan view of the other lamination plate of the other pair of the lamination plates.

FIG. 10B shows a section along the line XB-XB of FIG. 10A;

Fig. 11 is a side view of the exhaust heat exchange apparatus of the first embodiment of the present invention according to;

12A is a plan view of a terminal block.

12B is a side view of the terminal block.

Fig. 13 is sectional views of the pair of lamination plates before being assembled;

Fig. 14 sectional views of the pair of lamination plates after assembly

Figure 15 is a partial section through an exhaust gas heat exchange device according to a second embodiment of the present invention.

Fig. 16 is another partial section through the exhaust gas heat exchange device according to the second embodiment of the present invention;

Fig. 17 is a side view of a modified metal plate of the second embodiment of the present invention shown in;

FIG. 18 is a partial section through an exhaust gas heat exchange device according to a third embodiment of the present invention;

FIG. 19A is a plan view of an exhaust gas heat exchange device according to a fourth embodiment of the present invention;

FIG. 19B is a section through the exhaust gas heat exchange device according to the fourth embodiment of the present invention;

20A is a plan view of a laminator according to the fourth embodiment of the present invention.

FIG. 20B is a side view of the laminator to the fourth embodiment of the present invention according to;

FIG. 21A is a plan view of a metal plate according to the fourth exporting approximately of the present invention;

FIG. 21B is a side view of the metal plate according to the fourth exporting approximately of the present invention; and

Fig. 22 is a section through a considered exhaust gas heat exchange device in comparison with the embodiment of the present invention.

Preferred embodiments of the present invention will be described below as examples in which an exhaust gas heat exchange device (hereinafter referred to as a gas cooler) 100 is applied to exhaust gas recirculation systems (hereinafter referred to as EGR systems) for internal combustion engines, as shown in FIG. 1.

Part of the exhaust gas discharged from a diesel engine (hereinafter referred to as an engine) 200 is recirculated to the intake side of the engine 200 through an exhaust gas recirculation line 210 as shown in FIG. 1.

A well known EGR valve 220 is disposed in the exhaust gas recirculation line 210 and regulates the amount of EGR gas according to the operation of the engine 200 . The gas cooler 100 is disposed in the exhaust gas recirculation line 210 between the exhaust side of the engine 200 and the EGR valve 220 and is used to cool the EGR gas by heat exchange between the EGR gas and water as an engine coolant (hereinafter referred to as a coolant ).

Next, the construction of the gas cooler 100 according to the first embodiment of the present invention will be described with reference to FIGS . 2 to 6. In the gas cooler 100 , the EGR gas flows in an exhaust passage 110 , and the coolant flows in a coolant passage 120 , as shown in FIG. 4. Stainless inner fins 111 are provided in the exhaust passage 110 to enlarge the areas with which the EGR gas comes into contact to promote heat exchange between the EGR gas and the coolant. The inner ribs 111 are ribs of the so-called offset type, the surfaces of which are offset from one another at right angles to the flow direction of the EGR gas.

After the inner ribs 111 are inserted between a pair of the lamination plates 131 and 132 to form a unit of lamination plates, a plurality of laminated units become one by one in thickness directions thereof (in the top-down direction and the bottom-down direction, respectively) above in Fig. 4 are stacked), and the lamination plates 131 and 132 are adjacent to each other with the inner fins 111 by brazing using copper as a brazing material bonded together.

The exhaust gas and coolant passages 110 and 120 are formed between two adjacent lamination plates 131 and 132 , respectively. Therefore, as shown in FIGS. 3 and 6, the exhaust gas and coolant passages 110 and 120 each extend parallel to the plate surfaces of the lamination plates 131 and 132 (in the direction from right to left and from left to right in FIG Drawings).

Each of the lamination plates 131 and 132 is formed into a given shape, as shown in Figs. 7 and 8, by pressing an almost rectangular-shaped, stainless thin plate. One of the lamination plates 131 and 132 is integrally press-fitted at its front end with a first protruding peripheral part 133 which protrudes in one of the lamination directions (D directions) of the lamination plates 131 and 132 . And the other of the lamination plates 131 and 132 is integrally press-fitted at its front end with a second protruding peripheral part 134 which protrudes in the other of the lamination directions (D directions) of the lamination plates 131 and 132 .

The first and second protruding peripheral parts 133 and 134 overlap each other parallel to the lamination directions D of the lamination plates 131 and 132 , and the overlapped surfaces 133 a and 134 a of the respective first and second protruding peripheral parts 133 and 134 are connected to one another by soldering. As shown in FIG. 3, an exhaust gas inlet 141 for introducing EGR gas to the exhaust gas passages 110 and an exhaust gas outlet 142 for discharging EGR gas from the exhaust gas passages 110 are in the first and second peripheral parts 133 and 134 trained.

When the first and second protruding peripheral parts 133 and 134 are attached as shown in FIG. 4, the gas cooler 100 is composed of gas cooler core areas 101 that form both the exhaust gas and the coolant passages 110 and 120 the gas cooler has a container area 102 in which the gas cooler core areas 101 are accommodated. The EGR gas mainly flows in a straight line in the gas cooler 100 along the EGR gas passages 110 .

As shown in FIGS. 9 and 11, each of the units of the lamination plates, which are formed by the lamination plates 131 and 132 , which have the exhaust gas inlet and the outlet 141 and 142 , are equipped with indentations 141 a and 142 a, which form the exhaust gas inlet and outlet 141 and 142 . The terminal blocks 143 for connecting the exhaust gas recirculation pipes (outer pipes) 210 to the exhaust gas inlet and outlet 141 and 142 , respectively, are with the first protruding peripheral part 143 of the laminated mats 131 near the exhaust gas inlet and outlet 141 and 142 connected.

As shown in Fig. 12, each of the terminal blocks 143 is made of stainless material, and it consists of a square-shaped first flange portion 143 a, which is to be connected by soldering to the first projecting peripheral part 133 , of a diamond-shaped second Flange region 143 b, which is to be fastened with screws to the outer line 210 , and from a projecting region (tap) 143 c for arranging the connection block with regard to the exhaust gas inlet or outlet 141 or 142 .

Furthermore, as shown in FIGS. 3 and 6, the gas cooler 100 with an inlet connection line 151 for introducing coolant to the coolant passages 120 and with an outlet connection line 152 for discharging coolant to the outside after heat in the gas cooler 100 has been replaced. According to the first embodiment, the inlet connection pipe 151 is arranged on one side of the exhaust gas outlet 142 , and the outlet connection pipe 152 is arranged on a side of the exhaust gas inlet 141 , so that the coolant in the coolant passages 120 in an opposite direction may flow to the flow of EGR gas in the exhaust passages 110 .

Next, a manufacturing method for the gas cooler 100 will be described.

First, each of the lamination plates 131 and 132 (including the lamination plates with the recesses 141 a and 142 a) is formed by pressing (a pressing operation) of a stainless thin plate, the front and rear surfaces of which are soldered (in this Embodiment with copper) are coated (plated).

Next, as shown in FIGS. 3 to 6, a plurality of units of lamination plates, each of which is formed by lamination plates 131 and 132 , as shown in FIGS. 13 and 14, are laminated in their thickness direction (first temporary assembly process) . The thickness of the lamination plates 135 and 136 arranged at the most outer opposite ends in the lamination directions D is thicker than that of the other lamination plates 131 and 132 because the lamination plates 135 and 136 have outer walls at the opposite front ends in FIG form the lamination directions D of the gas cooler 100 .

Then, the connecting pipes 151 and 152 are temporarily assembled with the lamination plate 135 , and a pair of the terminal blocks 143 with the first and second protruding peripheral parts 133 and 134 is temporarily inserted into the exhaust gas inlet and outlet 141 and 142 by inserting the protruding portions 143 c merged (second temporary merging process). The lamination plates 131 and 132 , the lamination plates 135 and 136 , the connection blocks 143 and the connecting lines 151 and 152 are supported with the aid of tensioning devices after the second temporary assembly process and then connected by means of soldering in connection with heating in an oven (Soldering process).

The gas cooler 100 manufactured as indicated above has the features described below.

One lamination plate of the pair of lamination plates 131 of any one of the lamination plate units is integrally provided with the first protruding peripheral part 133 extending in a lamination direction D of the lamination plates 131 and 132 , and the other lamination plate of the pair of lamination plates 132 is integral with the second one Hanging peripheral part 134 , which extends in the other lamination direction D of the lamination plates 131 and 132 , so that the first and the second protruding peripheral part 133 and 134 can overlap parallel to the lamination directions D and the overlapped surfaces 133 a and 134 a of the first or second protruding peripheral part 133 and 134 are connected to one another by soldering.

As a result, the lamination plates 131 and 132 can be connected with sufficient joint strength without forming outward curved peripheral surfaces perpendicular to the lamination directions D. Further, the outer wall surfaces of the lamination plates 131 and 132 become parallel to the lamination directions thereof (hereinafter referred to as outer wall connection surfaces) flat without the concave and convex areas, so that the terminal blocks 143 can be easily and firmly connected to the outer wall connection surfaces by soldering.

While the effectiveness of the heat exchange of the gas cooler 100 is improved because the gas cooler 100 has the inner fins 111 in the exhaust gas passages 110 , the EGR gas in the gas cooler 100 flows almost linearly from the inlet 141 to the outlet 142 so that the pressure loss of the EGR gas can be reduced.

As shown in Fig. 5, when a gap g between a front end 133 b of the first protruding peripheral part 133 of one of the lamination plates 131 and a base 133 c of the first protruding peripheral part 133 meet another of the lamination plates 131 after the second temporary assembling process is too small, the front end 133 b and the base 133 c together because the solder material laminated on the laminating plate 131 or 132 is melted during the soldering process, so that any length of the laminating plate 131 or 132 in its thickness direction can be shortened. As a result, the inner ribs 111 cannot be reliably connected to the lamination plates 131 and 132 .

On the other hand, if the gap g between the front end 133 b and the base 133 c is too large after the second temporary joining process, the gap g is maintained after the soldering process, so that the concave and convex portions on the outer wall connection surfaces can be formed .

Therefore, dimensions such as the height h of the inner ribs 111 ( Fig. 5) and the protruding length L of the first protruding peripheral part 133 ( Fig. 5) must be carefully defined in consideration of the shortening of the thickness length of the lamination plate 131 or 132 during the soldering process .

An exhaust gas heat exchange device according to a second embodiment of the present invention will be described below with reference to FIG. 15. According to the second embodiment, a deformable thin metal plate (stainless plate in this embodiment) is inserted between each of the terminal blocks 143 and the first protruding peripheral part 133 and connected to the outer wall connection surfaces by soldering. Although the surfaces 133 a and 134 a of the first and the second protruding circumferential parts 133 and 134 are connected to one another parallel to the lamination directions D in order to make the outer wall connecting surfaces flat, it may be the case that the outer wall connecting surfaces lead to that they have relatively large concave and convex areas due to fluctuations in the manufacture and assembly of the lamination plates 131 and 132 .

On the other hand, it may be the case that the connection surfaces of the connecting blocks 143, as shown by a chain line in FIG. 16, the terminal blocks are bent in the soldering process 143 by the shrinkage of the connecting surfaces and relatively large gaps between the outer wall connecting surfaces and the connecting surfaces of the connecting blocks 143 are formed, which leads to a non-sufficient connection of the terminal blocks 143 with the outer wall-contacting surfaces.

Therefore, in the case that the deformable thin metal plate 144 is inserted between each of the terminal blocks 143 and the first protruding peripheral part 133 and each of the terminal blocks 143 is connected to the lamination plates 131 and 132 via the deformable thin metal plate 144 , the thin metal plate takes over 144 the task of a seal (packing) so that the connection surfaces of the connection block 143 and the outer wall connection surfaces can be attached to the metal plate 144 in order to limit the gaps between them. As a result, the connection block 143 by brazing with the outer wall surface connection via the metal plate 144 fixedly connected, so that the reliability of the gas cooler can be increased 100th

As shown in FIG. 17, the thin plate 144 may be curved in a waveform to accomplish the object of the second embodiment.

A gas cooler 100 according to a third embodiment of the present invention will be described below with reference to FIG. 18.

According to the third embodiment, as shown in FIG. 18, one of the connection blocks 143 is provided with a through hole 143 a, which communicates with the exhaust gas passages 110 , and is the deepest inner surface 143 b of the through hole 143 a located at a position lower than the deepest inner surface of the exhaust gas passages 110 so that water to which moisture in the EGR exhaust gas has condensed can be discharged from the exhaust gas passages 110 .

Although FIG. 18 shows only a design on one side of exhaust gas inlet 141, the location at the deepest inner surface 133 143b of the through hole A is also at a side of the exhaust outlet 142 in a position deeper than the location at the deepest inner surface the exhaust gas passages 110 may be arranged.

A gas cooler 100 according to a fourth embodiment of the present invention will be described below with reference to FIGS. 19A and 19B. According to the fourth embodiment, the height h1 of the gas cooler core area 101 (the dimension parallel to the lamination directions D) is almost equal to the length of the height h2 of the exhaust gas inlet 141 of the exhaust gas outlet 142 .

As shown in Fig. 19A, 19B, 20A and 20B, the outermost lamination plates 135 and 136 in addition to the lamination plates 131 and 132, which form the outer walls of the gas cooler 100, at its opposite front longitudinal ends to bend areas 137 having peripheral surfaces 135 a and 136 a equipped, which extend parallel to the lamination directions D and in directions from each other (in directions from top to bottom and from bottom to top in FIG. 19B).

Furthermore, the metal plate 144 is provided on its opposite circumferences at right angles to the lamination directions D with bending regions 114 b each with a wall surface 144 a, which extend in the lamination directions D, as shown in FIGS. 19A, 19B, 21A and 21B. The length of the height h3 of each of the turn portions 144 b (the dimension parallel to the Laminierungsrichtungen D) is almost equal to the length h4 between the opposed front ends of the bend portions 137, which are provided at the lamination plates 135 and 136th

As stated above, since the wall surfaces 144 a, which they extend in the lamination directions D, are provided on the plate 144 , the wall surfaces 144 a serve as a guide surface for easy alignment or alignment of the lamination plates 131 and 132 , if the Lamination plates 131 and 132 are laminated in the first temporary assembly process.

Furthermore, since the plates 135 and 136 are equipped with the peripheral surfaces 135 a and 136 a, which extend outward in opposite directions from the gas cooler core areas 101 , the contact surfaces on which the plates 144 with the gas cooler core areas 101 come into contact, continue. Then, the terminal blocks 143 can be attached to the lamination plates 135 and 136 with a greater connection strength.

According to the above-mentioned embodiments, the gas cooler 100 is applied to the heat exchanger for EGR gas circulation systems. However, the gas cooler 100 can also be used in other heat exchangers, such as a heat exchanger to be placed in an exhaust, for collecting exhaust heat energy. Although the gas cooler 100 has the plates 144 according to the third embodiment, the peripheral surfaces 135 a and 136 a of the lamination plates 135 and 136 can also be used in the gas cooler 100 without the plates 144 , as shown in the first embodiment.

Furthermore, according to the fourth embodiment, the height h1 of the gas cooler core region 101 is almost equal to the length of the height h2 of the exhaust gas inlet 141 or the exhaust gas outlet 142 . The peripheral surfaces 135 a and 136 a can be used in the gas cooler in which the height h1 of the gas cooler core region 101 is greater than the length of the height h2 of the exhaust gas inlet 141 or the exhaust gas outlet 142 , as in the first embodiment is posed.

Claims (7)

An exhaust gas heat exchange device for exchanging heat between an exhaust gas and a coolant, comprising a plurality of units, each of which is formed of a pair of lamination plates ( 131 , 132 ) which are laminated and joined together by soldering, from exhaust gas - Passages ( 110 ) and from coolant passages ( 120 ), which are provided between two adjacent lamination plates ( 131 , 132 ), from inner ribs ( 111 ), which at least one of the exhaust gas passages ( 110 ) and the coolant Passages ( 120 ) are arranged, from an exhaust gas inlet ( 141 ) and an outlet ( 142 ), which are arranged on opposite sides of the exhaust gas passages ( 110 ), and from a pair of connecting blocks ( 143 ), which with the lamination plates ( 131 , 132 ) at the exhaust gas inlet ( 141 ) and the outlet ( 142 ) for connecting external conduits ( 210 ) to the exhaust gas passages ( 110 ) the exhaust gas is perpendicular to the lamination directions of the lamination plates ( 131 , 132 ) from one of the blocks of the pair of connection blocks ( 143 ) through the exhaust gas inlet ( 141 ), through the exhaust gas passages ( 110 ) and through the exhaust gas outlet ( 142 ) flows through to the other block of the pair of terminal blocks ( 143 ), characterized in that: one of the lamination plates of the pair of lamination plates ( 131 ) of any one of the units is integrally provided with a first protruding peripheral part ( 133 ) which extends in a lamination direction of the lamination plates ( 131 , 132 ), and the other lamination plate of the pair of lamination plates ( 132 ) is integrally provided with a second protruding peripheral part ( 134 ) extending in the other lamination direction of the lamination plates ( 131 , 32 ) so that the first and the second protruding peripheral part ( 133 , 134 ) parallel to the directions of lamination de r lamination plates ( 131 , 132 ) can overlap one another and the overlapped surfaces ( 133 a, 134 a) of the respective first and second projecting peripheral parts ( 133 , 134 ) can be connected to one another by soldering. 2. The apparatus of claim 1, further comprising: a deformable thin metal plate ( 144 ) disposed between each of the terminal blocks ( 143 ) and the first protruding peripheral part ( 133 ), each of the terminal blocks ( 143 ) with the lamination plates ( 131 , 132 ) is connected via the deformable, thin metal plate ( 144 ). 3. Apparatus according to claim 2, wherein the deformable, thin metal plate ( 144 ) is provided on its circumference with a wall surface ( 144 a) which extends in the lamination directions of the lamination plates ( 131 , 132 ). 4. The apparatus of claim 1, 2 or 3, wherein the outermost lamination plates ( 135 , 136 ) are provided at their opposite ends with peripheral surfaces ( 135 a, 136 a) which are parallel to the directions of lamination of the lamination plates ( 131 , 132 ) and spaced apart in directions, each of the connection blocks ( 143 ) being connected to the peripheral surfaces ( 135 a, 136 a) by soldering. 5. The device according to any one of claims 1-4, wherein each of the connection blocks ( 143 ) is provided with a through hole ( 143 a) which communicates with the exhaust gas passages ( 110 ), and the lowermost inner surface ( 143 b) the through hole ( 143 a) of at least one of the connection blocks ( 143 ) is arranged in a position lower than the deepest inner surface of the exhaust gas passages ( 110 ), so that water to which moisture is condensed in the EGR exhaust gas, can be discharged from the exhaust gas passages ( 110 ). An exhaust gas heat exchange device for exchanging heat between an exhaust gas and a coolant, comprising a plurality of units, each of which is formed from a pair of lamination plates ( 131 , 132 ) laminated and joined together by soldering, from exhaust gas - Passages ( 110 ) and from coolant passages ( 120 ), which are provided between two adjacent lamination plates ( 131 , 132 ), from inner ribs ( 111 ), which at least one of the exhaust gas passages ( 110 ) and the coolant Passages ( 120 ) are arranged, from an exhaust gas inlet ( 141 ) and an outlet ( 142 ), which are arranged on opposite sides of the exhaust gas passages ( 110 ), and from a pair of connecting blocks ( 143 ), which with the lamination plates ( 131 , 132 ) at the exhaust gas inlet ( 141 ) and the outlet ( 142 ) for connecting external conduits ( 210 ) to the exhaust gas passages ( 110 ) the exhaust gas is perpendicular to the lamination directions of the lamination plates ( 131 , 132 ) from one of the blocks of the pair of connection blocks ( 143 ) through the exhaust gas inlet ( 141 ), through the exhaust gas passages ( 110 ) and through the exhaust gas outlet ( 142 ) flows through to the other block of the pair of terminal blocks ( 143 ), characterized in that: the outermost lamination plates ( 135 , 136 ) are provided at their opposite front ends with peripheral surfaces ( 135 a, 136 a) extend parallel to the directions of lamination of the lamination plates ( 131 , 132 ) and in directions apart from one another, each of the connection blocks ( 143 ) being connected directly or indirectly by soldering to the peripheral surfaces ( 135 a, 136 a). 7. The apparatus according to claim 6, wherein one lamination plate of the pair of lamination plates ( 131 ) of each of the units is integrally provided with a first protruding peripheral part ( 133 ) extending in a lamination direction of the lamination plates ( 131 , 132 ), and the other The lamination plate of the pair of lamination plates ( 132 ) is integrally provided with a second protruding peripheral part ( 134 ) extending in the other lamination direction of the lamination plates ( 131 , 132 ) so that the first and second protruding peripheral parts ( 133 , 134 ) are parallel to the lamination directions of the lamination plates ( 131 , 132 ) can overlap one another and the overlapped surfaces ( 133 a, 134 a) of the respective first and second projecting peripheral parts ( 133 , 134 ) can be connected to one another by soldering.