JP2018146161A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the joining strength of a joining part in a heat exchanger composed of a casing body and an end lid. In a heat exchanger (1) in which a heat exchange part (3) is housed in a box-shaped casing body (2) having an opening (9) and an end cover (4) is joined to the opening (9) of the casing body (2), the casing body (2) A flange-like joint 10 is formed in the opening 9 so as to be bent and protrude from the side wall 6 of the casing body 2 toward the outside of the casing body 2, and a bent portion 12 is formed at the boundary between the side wall 6 and the joint 10. The end lid 4 is formed with a protrusion 13 that contacts the bent portion 12, and the peripheral edge 11 of the end lid 4 is joined to the joint 10 of the casing body 2, and the end lid 4 The protruding portion 13 is joined to the bent portion 12. [Selection] Figure 1

Description

  The present invention relates to a heat exchanger in which a heat exchange part is housed in a box-shaped casing body having an opening, and an end lid is joined to the opening of the casing body.

  In heat exchangers such as EGR coolers, exhaust heat recovery devices, and electronic device coolers, a heat exchange part (core part) is housed in a box-shaped casing body having an open top, and the opening is used for sealing. Some are assembled by joining end covers (lid portions) by brazing or the like.

  Conventionally, this type of heat exchanger has a flange-like joint that projects horizontally outward at the opening of the casing body, and the peripheral surface of the end cover formed in a plate shape is joined by brazing or the like. As a result, the casing body is hermetically sealed.

FIG. 9A is an external view of a joining structure of a casing body and an end lid in a conventional heat exchanger. In this example, the heat exchanger 1 includes a box-shaped casing main body 2 having an opening at the upper end, a heat exchanging portion 3 accommodated therein, and a plate-shaped end lid 4 joined to the opening of the casing main body 2. ing. The casing body 2 and the end lid 4 form a casing, and a pair of tank portions 14 are provided at both ends in the longitudinal direction of the casing.
The heat exchange part 3 consists of the flat tube 16 and the tube plate 15 by which the both ends were penetrated as an example. And the outer periphery of the heat exchange part 3 is fitted by the casing main body and the end cover. The casing body 2 has a bottom portion (not shown) and a side wall portion 6. Except for the tank portion 14, the side wall portion 6 is provided with a pair of inlets / outlets 7 for circulating one fluid such as cooling water. Yes. The end lid 4 is formed with a plurality of elongated ribs 5 projecting upward except for both end portions thereof in parallel with each other. These ribs are for reinforcing the strength of the end lid 4.

  FIG. 9B is an enlarged cross-sectional view showing a joint portion between the casing body 2 and the end lid 4 in FIG. An opening 9 is formed at the upper end of the casing body 2, and a horizontal flange-shaped joint 10 that is bent and protrudes from the side wall 6 of the casing body 2 toward the outside of the casing body is formed. The annular peripheral edge 11 of the end lid 4 is joined to the joint 10 of the casing body 2 by brazing or the like.

  Depending on the type of heat exchanger, the temperature inside the sealed casing body 2 may gradually increase, and the internal pressure may increase accordingly. In addition, in the case of a heat exchanger mounted on a vehicle or other moving equipment, it is often subjected to fine vibrations and shaking. Due to the increase or shaking of the internal pressure, a part of the end lid 4 joined to the joining portion 10 of the casing body 2 shown in FIG. 9B may be peeled off or a joining deviation may occur. In such a case, a part of the joint portion between the casing body 2 and the end lid 4 is cracked, which adversely affects the heat exchange performance and life.

  In order to avoid these problems, it is necessary to increase the bonding strength between the casing body 2 and the end lid 4. In order to increase the bonding strength, if the area of the flange-shaped bonding portion is enlarged and the area of the flat surface of the end cover 4 is increased accordingly, the overall size of the heat exchanger is increased.

  As a result, it may not be possible to meet extremely strict installation conditions such as vehicles with limited weight and installation volume. Moreover, when joining a casing main body and an end cover, it is necessary to position a casing main body and an end cover, but when a joining surface is only a single flat surface, position shift will arise easily.

  Then, this invention makes it a subject to provide the new heat exchanger which solves such a problem with simple structure.

In a first invention for solving the above-mentioned problem, a heat exchange part (3) is housed in a box-shaped casing body (2) having an opening (9), and the opening (9) of the casing body (2) is accommodated. In the heat exchanger (1) to which the end cap (4) is joined,
A flange-like joint (10) is formed in the opening (9) of the casing main body (2) so as to be bent from the side wall (6) of the casing main body (2) toward the outside of the casing main body (2). The bent portion (12) is formed at the boundary between the side wall portion (6) and the joint portion (10), and the end lid (4) is formed with a protruding portion (13) that contacts the bent portion (12). The peripheral portion (11) of the end lid (4) is joined to the joint portion (10) of the casing body (2), and the protrusion (13) of the end lid (4) is joined to the bent portion (12). ). (Claim 1).

According to a second aspect of the present invention, in the first aspect,
The protrusion (13) is an elongated rib extending along the boundary between the side wall (6) of the casing body (2) and the joint (10), and the rib extends to the bent portion (12). It has the surface which contacts in contact in alignment, The surface is joined to the bending part (12) (Claim 2).

According to a third aspect of the present invention, in the second aspect,
The end cover (4) is formed in a flat plate shape, and ribs (5) for reinforcing the end cover that are not parallel to the protrusion (13) are formed on the flat surface (claim 3). ).

  According to a fourth aspect of the present invention, the projecting portion (13) is a flat surface that is recessed over the entire opening (9) of the casing body (2) with respect to the peripheral portion (11) of the end lid (4). 17). (Claim 4)

  According to a fifth aspect of the present invention, an auxiliary projection (13a) that is recessed in the thickness direction from the recessed plane (17) is integrally formed at the edge of the projection (13). The auxiliary protrusion (13a) is joined to the bent portion (12) (Claim 5).

  According to a sixth aspect of the present invention, the end lid (4) is formed on a flat surface (18) in which other portions protrude outward in the thickness direction with respect to the peripheral edge portion (11), and the protruding portion thereof. A protrusion (13) is formed on the edge of the flat surface (18) (Claim 6).

  In the first invention, a projection 13 that abuts on the bent portion 12 of the casing body 2 is formed adjacent to the bent portion 12 on the end lid 4, and the protruding portion 13 is joined to the bent portion 12. It is characterized by that. If comprised in this way, since the end cover and the casing main body 2 can be positioned by the projection part 13 of the end cover 4, workability | operativity of temporary assembly and temporary fixation improves. Further, since the joining area is increased by joining the protruding portion 13 of the end lid 4 and the bent portion 12 of the casing 2, the joining strength is increased accordingly, and the pressure resistance strength of the heat exchanger 1 is also improved.

  According to a second invention, in the first invention, the protrusion 13 is an elongated rib extending along the boundary between the side wall portion 6 and the joint portion 10 of the casing body 2, and the inner surface of the bent portion 12 is a curved surface. It is characterized by being. If comprised in this way, the junction area of the projection part 13 and the bending part 12 to be joined can be increased more. In addition, a part of the internal pressure that acts on the protruding portion 13 that is not joined to the bent portion 12 acts in a direction in which the curved surface of the bent portion 12 and the protruding portion 13 are pressed together. Thereby, the pressure | voltage resistant strength of the heat exchanger 1 with respect to an internal pressure improves more.

  Despite such an improvement in pressure resistance, when viewed as a whole heat exchanger, no increase in external volume or weight occurs. Moreover, this rib functions more reliably as a positioning part when joining the end lid to the casing body.

The third invention is characterized in that the end lid 4 is flat and has ribs for reinforcing the end lid that are not parallel to the projections 13.
By adding such reinforcing ribs, the bending rigidity of the flat end cover 4 is ensured in any bending direction, so that the pressure resistance of the end cover 4 is improved.

The fourth invention is characterized in that the projection 13 has a flat surface 17 that is recessed over the entire opening 9 of the casing body 2 with respect to the peripheral edge 11 of the end lid 4.
Also with this configuration, the end lid 4 and the casing body 2 can be positioned by the protrusion 13 of the end lid 4, so that the workability of temporary assembly and temporary fixing is improved. Further, since the joining area is increased by joining the protruding portion 13 of the end lid 4 and the bent portion 12 of the casing 2, the joining strength is increased accordingly, and the pressure resistance strength of the heat exchanger 1 is also improved.

In addition to the above configuration, the fifth invention is characterized in that an auxiliary projection 13a is formed integrally with the projection 13.
By comprising in this way, the contact surface of the projection part 13 and the said bending part 12 becomes still wider, and pressure | voltage resistance improves further.

The sixth invention is characterized in that the end lid 4 is formed on a flat surface 18 protruding outward in the thickness direction with respect to the peripheral edge portion, and a protrusion 13 is formed on the edge of the flat surface.
With this configuration, the force acting in the direction in which the curved surface of the bent portion 12 and the protruding portion 13 are pressed against each other by the internal pressure acting on the protruding portion 13 that is not joined to the bent portion 12 increases. The pressure resistance strength of the heat exchanger 1 against this is further improved.

The disassembled perspective view of the heat exchanger of this invention. II-II arrow sectional drawing of FIG. The expanded sectional view of the III part of FIG. FIG. 4 is a cross-sectional view taken along arrows IV-IV in FIG. 1. The external appearance perspective view and side sectional drawing of the heat exchanger in another embodiment of this invention. The perspective view and the BB arrow sectional drawing of the other Example of this invention. The perspective view of the further another Example of this invention and the BB arrow sectional drawing. The perspective view of the further another Example of this invention and the BB arrow sectional drawing. The external appearance perspective view and fragmentary sectional view of the conventional heat exchanger.

  Next, an embodiment of the heat exchanger of the present invention will be described with reference to the drawings. 1 is an exploded perspective view of the heat exchanger of the present invention, FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, FIG. 3 is an enlarged cross-sectional view of the III part in FIG. It is arrow sectional drawing. In these drawings, a heat exchanger 1 is a box-shaped casing body 2 having an opening, a heat exchanging portion (core portion) 3 accommodated therein, and a flat plate joined to an opening 9 of the casing body 2. The end cover 4 is provided. The casing body 2 and the end lid 4 can be formed by molding metals such as stainless steel and aluminum alloy. Alternatively, it can be formed by molding a ceramic material or the like.

The rectangular casing body 2 has a bottom portion 2a provided with a plurality of reinforcing ribs and four vertical side wall portions 6. A fluid such as cooling water is guided to the side wall portion 6 in the width direction. A pair of doorways 7 is provided. On the other hand, a pair of inlet / outlet ports 8 for fluid such as heated gas is provided on the side wall portions 6 at both ends in the longitudinal direction.
A plurality of elongate ribs 5 projecting upward are formed in the width direction in parallel with each other on the inner portion of the peripheral edge 11 of the end lid 4. These ribs 5 are formed to reinforce the strength of the end lid 4. The heat exchange unit 3 includes a plurality of flat tubes 16 and a pair of tube plates 15 through which both ends of the tubes 16 are inserted. Each tube 16 communicates with the entrance / exit 8.

  As shown in FIG. 1, an opening 9 is formed at the upper end of the side wall 6 of the casing body 2. The side wall 6 at the peripheral edge of the opening 9 is bent toward the outside of the casing body, thereby forming a flange-like joint 10 protruding in the horizontal direction from the casing body 2. The joining surface 10 has a horizontal and annular joining surface formed along the entire circumference of the casing body 2.

  As shown in FIG. 3, the portion where the side wall portion 6 is bent toward the outside of the casing body, that is, the flange-like joint portion 10 is bent at a right angle as a whole. In this embodiment, the part of the bending part 12 which exists in the boundary of the side wall part 6 and the junction part 10 is formed in the curved surface (arc shape). Note that the shape of the bent portion 12 can be formed not only by a curved surface but also by an inclined plane or a combination thereof.

  As shown in FIG. 1, the end lid 4 in the present embodiment has an annular peripheral edge 11, and a pair of protrusions 13 are formed inside the peripheral edge 11. The pair of protrusions 13 is composed of two elongated ribs arranged in parallel to each other. Each rib is also disposed substantially parallel to the outer edge of the peripheral edge 11.

As shown in FIG. 3, each protrusion 13 protrudes toward the casing body 2 side.
The protrusion 13 can be formed of a plurality of circular or elliptical dimple-shaped protrusions juxtaposed at a predetermined interval other than the rib. In the example of FIG. 1, the protrusion 13 is composed of two elongated ribs arranged in parallel to each other. However, two elongated ribs orthogonal to and parallel to the two ribs are further added. A total of four ribs may be used.
The protruding portion 13 of the end lid 4 is formed so that a part of the protruding portion 13 can reliably contact the bent portion 12 of the casing body 2.

Next, the joining form of the casing main body 2 and the end lid 4 shown in FIG. 1 will be described.
As shown in FIG. 3, when the end lid 4 is opposed to the opening 9 of the casing body 2, the lower surface of the annular peripheral edge 11 of the end lid 4 is placed on the upper surface of the annular joint 10 of the casing body 2. At the same time, the protrusion 13 formed on the end lid 4 comes into contact with the bent portion 12 formed on the casing body 2. The positioning at that time is reliably performed by the pair of ribs which are the protrusions 13.

In the facing state as described above, the upper surface of the joint surface 10 of the casing body 2 and the lower surface of the peripheral edge portion 11 of the end lid 4, and the joint portion of the curved surface of the bent portion 12 of the casing body 2 and the protrusion 13 of the end lid 4 are Are joined together by brazing or the like.
Note that brazing is performed by a method using an aluminum alloy clad with a brazing material or by brazing the brazing material directly at a joint portion. In addition, it is also possible to join using a strong adhesive. In addition, the state of the casing main body 2 and the end cover 4 after joining in this way is the same as that of FIGS.

  FIG. 5 (A) is an external perspective view of a heat exchanger according to another embodiment of the present invention, and FIG. 5 (B) is a side sectional view taken along line BB in FIG. 5 (A). The only difference between the present embodiment and the embodiment of FIG. 1 is the number of protrusions 13 formed on the end lid 4, and the rest of the configuration is the same. Therefore, the same parts are denoted by the same reference numerals, and redundant description is omitted as much as possible.

  As shown in FIG. 5 (A), a projection 13 formed of two pairs of elongated ribs parallel to each other is formed inside the peripheral edge 11 of the end lid 4. Specifically, it is composed of a total of four ribs including a pair of parallel ribs and another pair of parallel ribs orthogonal thereto. Also in this embodiment, the joining form of each protrusion 13 of the end lid 4 and the bent part 12 formed in the opening 9 of the casing body 2 is the same as the example of FIG.

  Thus, even when the number of the protrusions 13 is increased, the material and the molding process of the end lid 4 are the same as those in FIG. Further, when the number of the protrusions 13 is increased in this way, the joining area is increased accordingly, the reinforcing strength can be further increased, and the pressure resistance strength of the heat exchanger against the internal pressure acting on the casing body 2 is improved.

Next, FIG. 6 (A) is a perspective view of a heat exchanger in still another embodiment of the present invention, and FIG. 6 (B) is a cross-sectional view taken along arrows BB in FIG. 6 (A).
In this example, the protrusion 13 is formed as one protrusion having a flat surface 17 that is recessed over the entire opening 9 of the casing body 4 with respect to the peripheral edge 11 of the end lid 4.

  Next, FIG. 7 is obtained by adding an auxiliary protrusion 13a to the protrusion 13 of FIG. By doing in this way, the joint surface of a projection part and the bending part 12 becomes still wider, and pressure | voltage resistance improves further. As shown in FIGS. 6 and 7, in the present invention, the protrusion 13 may be one large protrusion including a flat surface.

  Next, FIG. 8 shows still another embodiment of the present invention, in which the end cover 4 is formed on a flat surface 18 protruding outward in the thickness direction with respect to the peripheral edge portion 11, and a protrusion is formed on the edge of the flat surface 18. 13 is formed. By doing so, the force acting in the direction of pressing the curved surface of the bent portion 12 and the protruding portion 13 increases due to the internal pressure acting on the protruding portion 13 of the portion not joined to the bent portion 12, The pressure strength of the heat exchanger 1 against the internal pressure is further improved.

  The heat exchanger of this invention can be utilized for heat exchangers, such as an EGR cooler, an exhaust heat recovery device, and an electronic device cooler.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Casing main body 2a Bottom part 3 Heat exchange part 4 End cover 5 Rib 6 Side wall part 7 Entrance / exit 8 Entrance / exit 9 Opening part

DESCRIPTION OF SYMBOLS 10 Joining part 11 Peripheral part 12 Bending part 13 Projection part 13a Auxiliary projection part 14 Tank part 15 Tube plate 16 Tube 17 Plane 18 Plane

Claims (6)

Heat exchange in which a heat exchange part (3) is housed in a box-shaped casing body (2) having an opening (9), and an end lid (4) is joined to the opening (9) of the casing body (2) In vessel (1)
A flange-like joint (10) is formed in the opening (9) of the casing main body (2) so as to be bent from the side wall (6) of the casing main body (2) toward the outside of the casing main body (2). The bent portion (12) is formed at the boundary between the side wall portion (6) and the joint portion (10), and the end lid (4) is formed with a protruding portion (13) that contacts the bent portion (12). The peripheral portion (11) of the end lid (4) is joined to the joint portion (10) of the casing body (2), and the protrusion (13) of the end lid (4) is joined to the bent portion (12). The heat exchanger is characterized in that it is joined to the heat exchanger.   The protrusion (13) is an elongated rib extending along the boundary between the side wall (6) of the casing body (2) and the joint (10), and the rib extends to the bent portion (12). 2. The heat exchanger according to claim 1, wherein the heat exchanger has a surface that is aligned and abuts, and the surface is joined to the bent portion (12).   The end cover (4) is formed in a flat plate shape, and ribs (5) for reinforcing the end cover that are not parallel to the protrusions (13) are formed on the flat surface of the end cover (4). The described heat exchanger.   The protrusion (13) has a flat surface (17) that is recessed over the entire opening (9) of the casing body (2) with respect to the peripheral edge (11) of the end lid (4). The heat exchanger according to claim 1.   Auxiliary protrusions (13a) that are further recessed in the thickness direction than the recessed flat surface (17) are integrally formed at the edges of the protrusions (13), and the protrusions (13) and the auxiliary protrusions (13a) are formed as described above. The heat exchanger according to claim 4, wherein the heat exchanger is joined to the bent portion (12). The end lid (4) is formed on the flat surface (18) with the other portion protruding outward in the thickness direction with respect to the peripheral edge portion (11), and a protrusion on the edge of the protruding flat surface (18). (13) is formed, The heat exchanger in any one of Claim 2 or Claim 3 characterized by the above-mentioned.

Images