JP2019190684A - Joining structure, joining method, and plate lamination type heat exchanger - Google Patents

Abstract

To provide a plate lamination type heat exchanger that can improve productivity.SOLUTION: A plate lamination type heat exchanger 10 comprises a heat exchanger part 12 constituted by a plurality of laminated plate members 11, and a fin 30 arranged between the plurality of plate members 11. The plate members 11 comprise convex parts 110 and 111 protruding toward the fin 30, and the fin 30 comprises convex parts 300 and 301 protruding toward the plate members 11. The convex parts 110 and 111 of the plate members 11 and the convex parts 300 and 301 of the fin 30 are joined by brazing.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a joining structure, a joining method, and a plate stacking type heat exchanger.

  Conventionally, there is a plate-stacked heat exchanger described in Patent Document 1. The heat exchanger described in Patent Document 1 includes a pair of first plate and second plate, and fins. The front ends of both side walls of the first plate have stepped portions formed in a stepped shape on the inner side by the thickness of the plate. The side wall raised from the stepped portion is fitted to the inner surface of the side wall of the second plate. With such a fitting structure, the first plate and the second plate are assembled together. The fin is disposed between the first plate and the second plate. The first plate, the second plate, and the fin are integrally joined by brazing their contact portions. The heat exchanger is configured by laminating a plurality of flat tubes composed of a first plate, a second plate, and fins.

JP 2012-247093 A

  By the way, in the heat exchanger of patent document 1, when the clearance gap between each plate and a fin becomes large too much, since the brazing | wax material with which the clearance gap is filled is insufficient, airtightness fall, intensity | strength lack, etc. It can happen. In order to ensure brazing of plates and fins even when the plate and fins are misaligned during assembly of the plate and fins and during heating during brazing, the gap between the plate and fins must be reduced. Conceivable. However, in order to reduce the gap between the plate and the fin using the fitting structure described in Patent Document 1, the dimensional management of those parts is reduced, or the plate and fin as described in Patent Document 1 are used. It is necessary to provide a fitting structure for positioning. This is a factor that deteriorates the productivity of the heat exchanger.

In addition, such a subject is a subject common to not only a plate lamination type heat exchanger but the joining structure which consists of a structure where two members were joined.
The present disclosure has been made in view of such circumstances, and an object thereof is to provide a joining structure, a joining method, and a plate stack type heat exchanger that can improve productivity.

  The joining structure that solves the above problem is a joining structure of the first member (11) and the second member (30), and the first member and the second member have at least one protrusion (110, 111, 300, 301), and the convex part of the first member and the convex part of the second member are joined by brazing.

  Moreover, the joining method which solves the said subject is a joining method of the 1st member (11) and the 2nd member (30) which are not restrained mutually at the time of an assembly | attachment, Comprising: At least 1 convex part (110,110) is provided in a 1st member. 111), a step of forming at least one projection (300, 301) on the second member, and a step of joining the projection of the first member and the projection of the second member by brazing. .

  According to these joining structures and joining methods, when the first member and the second member are joined by brazing, when the relative position of the second member with respect to the first member is deviated from a predetermined position, A restoring force that returns the second member to a predetermined position by the capillary force of the melted liquid brazing material, that is, a restoring force based on the self-alignment effect acts on the second member. Since the relative position of the second member relative to the first member can be returned to the predetermined position by returning the second member to the predetermined position by the restoring force based on the self-alignment effect, it is employed in the conventional joining structure. A fitting structure for positioning the first member and the second member is not required. Since the structure of the first member and the second member can be simplified to the extent that the fitting structure is not required, productivity can be improved.

  Furthermore, the plate-stacked heat exchanger (10) that solves the above-described problems is constituted by a plurality of stacked plate members (11), and a first flow path through which a first fluid flows between the plurality of plate members. And a heat exchange part (12) having a second flow path through which the second fluid flows, and fins (30) arranged between the plurality of plate members, the plate members projecting toward the fins. The fin has at least one convex part (110, 111), the fin has at least one convex part (300, 301) protruding toward the plate member, and the convex part of the plate member and the convex part of the fin are Joined by brazing.

  According to this heat exchanger, when the plate member and the fin are joined by brazing, if the relative position of the fin with respect to the plate deviates from a predetermined position, the capillary force of the molten liquid brazing material A restoring force that returns the fin to a predetermined position, that is, a restoring force based on the self-alignment effect acts on the fin. Since the fin is displaced to a predetermined position by the restoring force based on the self-alignment effect, the plate member and the fitting structure for positioning the fin that are employed in the conventional joining structure are not necessary. Since the structure of the plate member and the fin can be simplified to the extent that the fitting structure is unnecessary, productivity can be improved.

  In addition, the code | symbol in the parenthesis as described in the said means and a claim is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

  According to the present disclosure, it is possible to provide a joining structure, a joining method, and a plate stacked heat exchanger that can improve productivity.

Drawing 1 is a front view showing the front structure of the plate lamination type heat exchanger of an embodiment. FIG. 2 is a plan view showing a planar structure of the plate stack type heat exchanger according to the embodiment. FIG. 3 is an end view showing an end face structure taken along line III-III in FIG. FIG. 4 is a perspective view illustrating a perspective structure of the fin according to the embodiment. FIG. 5 is a perspective view showing a perspective structure of the plate member of the embodiment. FIG. 6 is an end view showing a part of the manufacturing process of the plate stack type heat exchanger according to the embodiment.

Hereinafter, an embodiment of a joining structure, a joining method, and a plate stacked heat exchanger will be described with reference to the drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.
As shown in FIG. 1, in the plate stack type heat exchanger 10 of the present embodiment, the first fluid that flows in from the first fluid inlet 101 and the second fluid that flows in from the second fluid inlet 104. Exchange of heat with The heat exchanger 10 can be used as a water-cooled condenser or an oil cooler for a vehicle, for example. When the heat exchanger 10 is used as a water-cooled condenser for a vehicle, a refrigerant is used as the first fluid and cooling water is used as the second fluid. When the heat exchanger 10 is used as an oil cooler for a vehicle, oil is used as the first fluid and cooling water is used as the second fluid.

  The heat exchanger 10 includes a plurality of plate members 11 stacked in the Z-axis direction. Hereinafter, one direction of the stacking directions of the plate members 11 is referred to as “Z1 axis direction”, and the opposite direction is referred to as “Z2 axis direction”. In the present embodiment, the plate member corresponds to the first member.

  As shown in FIG. 2, the plate member 11 is made of a plate material having a substantially rectangular cross-sectional shape perpendicular to the Z-axis direction. Hereinafter, the longitudinal direction of the plate member 11 is referred to as the X-axis direction. One direction of the X-axis direction is referred to as “X1-axis direction”, and the opposite direction is referred to as “X2-axis direction”. Further, the short direction of the plate member 11 is referred to as a Y-axis direction.

  As a material of the plate member 11, for example, a double-sided clad material in which a brazing material is clad on both sides of an aluminum core material is used. As shown in FIG. 1, an overhanging portion 112 protruding in the Z2 axis direction is formed on the outer peripheral edge of the plate member 11. All the plate members 11 are arranged so that the front end surface of the protruding portion 112 faces the Z2 axis direction. The plurality of plate members 11 are integrally joined by joining the protruding portions 112 to each other by brazing.

  The plurality of plate members 11 include a heat exchange section 12, a first fluid first tank space 13, a first fluid second tank space 14, a second fluid first tank space 15, and a second fluid second tank. A space 16 is formed. The heat exchange unit 12 has a plurality of first flow paths 121 and a plurality of second flow paths 122.

  The first flow path 121 and the second flow path 122 are alternately arranged one by one in the Z-axis direction. The plate member 11 serves as a partition that partitions the first flow path 121 and the second flow path 122. Heat exchange between the first fluid flowing through the first flow path 121 and the second fluid flowing through the second flow path 122 is performed via the plate member 11.

  The first tank space 13 for the first fluid and the first tank space 15 for the second fluid are arranged at the end of the first flow path 121 and the second flow path 122 on the X1 axial direction side in the heat exchange unit 12. Yes. The first fluid second tank space 14 and the second fluid second tank space 16 are arranged in the X2 axial direction ends of the first flow path 121 and the second flow path 122 in the heat exchange section 12. Yes.

  The first fluid first tank space 13 and the first fluid second tank space 14 distribute and collect the first fluid to the plurality of first flow paths 121. The first tank space 15 for the second fluid and the second tank space 16 for the second fluid distribute and collect the second fluid to the plurality of second flow paths 122.

  As shown in FIG. 2, the first fluid first tank space 13, the first fluid second tank space 14, the second fluid first tank space 15, and the second fluid second tank space 16 include: The plate member 11 is constituted by communication holes formed at the four corners. In the present embodiment, the first fluid first tank space 13 and the first fluid second tank space 14 are provided at two corners on the diagonal line of the substantially rectangular plate member 11, and the rest The second fluid first tank space 15 and the second fluid second tank space 16 are provided at the two corners.

  As shown in FIG. 1, among the plurality of plate members 11 constituting the heat exchanging unit 12, the first joint plate 21 is disposed on the first end plate member 11 </ b> A disposed at the endmost portion in the Z-axis uniaxial direction. And the 1st pipe 22 is attached. The first joint 21 is a member for joining a pipe for the first fluid, and forms a first fluid inlet 101 through which the first fluid flows into the heat exchanger 10. The first pipe 22 forms a second fluid outlet 102 through which the second fluid flows out of the heat exchanger 10.

  The second joint 23 and the second pipe 24 are attached to the second endmost plate member 11B disposed at the endmost in the Z2 axis direction among the plurality of plate members 11 constituting the heat exchange unit 12. . The second joint 23 is a member for joining a pipe for the first fluid, and forms a first fluid outlet 103 through which the first fluid flows out from the heat exchanger 10. The second pipe 24 forms a second fluid inlet 104 through which the second fluid flows into the heat exchanger 10.

The first fluid inflow port 101 and the first fluid outflow port 103 communicate with the first fluid first tank space 13. The second fluid outlet 102 and the second fluid inlet 104 are in communication with the second fluid first tank space 15.
As indicated by the solid line arrow in FIG. 1, the first fluid flowing in from the first fluid inlet 101 passes through the first flow path 121 on the Z1 axial direction side from the first fluid first tank space 13 side. It flows toward the second tank space 14 for one fluid. The first fluid that has flowed into the first fluid second tank space 14 passes through the first flow path 121 on the Z2 axis direction side from the first fluid second tank space 14 side to the first fluid first tank space 13 side. And then flows out from the first fluid outlet 103.

  Further, as indicated by the one-dot chain line arrow in FIG. 1, the second fluid that has flowed in from the second fluid inlet 104 passes through the second flow path 122 on the Z2 axial direction side through the second tank first tank space 15. Flows from the side toward the second tank space 16 for the second fluid. The second fluid flowing into the second fluid second tank space 16 passes through the second flow path 122 on the Z1 axial direction side from the second fluid second tank space 16 side to the second fluid first tank space 15 side. And then flows out from the second fluid outlet 102.

As shown in FIG. 3, fins 30 are arranged between the plate members 11. The fins 30 are interposed between the plate members 11 and have a function of promoting heat exchange between the first fluid and the second fluid. In the present embodiment, the fin 30 corresponds to the second member.
As shown in FIG. 4, the fin 30 is made of a plate-like member on which a partially raised part 30 a is formed. A plurality of cut-and-raised portions 30a are formed in a direction parallel to the flow direction of the first fluid and the second fluid, that is, in the X-axis direction.

The cut-and-raised portions 30a adjacent in the X-axis direction are offset from each other. In the example shown in FIG. 4, the plurality of cut-and-raised portions 30a are arranged in a staggered manner in the X-axis direction.
With the structure as described above, the fin 30 includes a first protrusion 300 formed so as to protrude in the Z1 axis direction and a second protrusion 301 formed so as to protrude in the Z2 axis direction. It has the structure which has alternately.

As a specific material of the fin 30, for example, a double-sided clad material in which a brazing material is clad on both sides of an aluminum core is used.
As shown in FIG. 5, like the fins 30, the plate member 11 also has a first protrusion 110 formed to protrude in the Z1 axis direction and a second protrusion formed to protrude in the Z2 axis direction. It has a structure having convex portions 111 alternately in the Y-axis direction. However, the 1st convex part 110 and the 2nd convex part 111 of the plate member 11 consist of a shape which continued in the X-axis direction.

  As shown in FIG. 3, the fins 30 are joined and fixed to both adjacent plate members 11 by brazing. Specifically, the top surface of the first convex portion 300 of the fin 30 is joined to the top surface of the second convex portion 301 of the plate member 11 adjacent in the Z1 axis direction via the brazing material B1. The top surface of the second convex portion 301 of the fin 30 is joined to the top surface of the first convex portion 300 of the plate member 11 adjacent in the Z2 axis direction via the brazing material B2. With such a joining structure of the brazing materials B1 and B2, the fins 30 are fixed to both adjacent plate members 11. Further, the fin 30 constitutes an inner wall that crosses the first flow path 121 and the second flow path 122 in the Z-axis direction.

Next, the manufacturing method of the heat exchanger 10 of this embodiment is demonstrated.
When manufacturing the heat exchanger 10, first, the process of shape | molding the several plate member 11 by press work etc. is performed. Moreover, the process of shape | molding the several fin 30 by press work etc. is performed. In the molding process of the plate member 11, the first convex portion 110 and the second convex portion 111 as shown in FIG. 3 are formed on the plate member 11. Further, in the fin 30 forming step, the first protrusion 300 and the second protrusion 301 as shown in FIG. 3 are formed on the fin 30.

  Thereafter, the plurality of plate members 11 and the plurality of fins 30 are alternately stacked. At this time, the first joint 21 and the first pipe 22 are attached to the first outermost plate member 11A, and the second joint 23 and the second pipe 24 are attached to the second outermost plate member 11B. Thereafter, the plurality of plate members 11 and the plurality of fins 30 arranged in a stacked manner are heated to melt the brazing material of the plate members 11 and the fins 30. At this time, as shown in FIG. 6, even when the relative position of the fin 30 with respect to the plate member 11 is deviated from the predetermined position shown in FIG. 3, the capillary force of the molten liquid brazing material, in other words, Due to the surface tension, a restoring force F based on the self-alignment effect that returns to the predetermined position shown in FIG. The fin 30 is displaced to the position shown in FIG. 3 by the restoring force F based on this self-alignment effect. Therefore, when the heat exchanger 10 is subsequently cooled, the protrusions 110 and 111 of the plate member 11 in a state where the relative positions of the fins 30 with respect to the plate member 11 are the predetermined positions shown in FIG. The convex portions 300 and 301 of the fin 30 are joined by brazing. The manufacture of the heat exchanger 10 is completed through such a brazing process.

  According to the joining structure and joining method of the heat exchanger 10 as described above, when the plate member 11 and the fin 30 are joined by brazing, the plate member 11 and the fin are bonded by the capillary force of the liquid brazing material. Therefore, the fitting structure employed in the conventional heat exchanger becomes unnecessary. Since the structure of the plate member 11 and the fins 30 can be simplified to the extent that the fitting structure is unnecessary, productivity can be improved.

In addition, the said embodiment can also be implemented with the following forms.
-The shape of the convex part 110,111 of the plate member 11 and the convex part 300,301 of the fin 30 can be changed into arbitrary shapes. For example, the convex portions 110 and 111 of the plate member 11 and the convex portions 300 and 301 of the fin 30 may be formed in a trapezoidal shape or a mountain shape similar to a sine wave.

-The convex part 110,111 of the plate member 11 may be comprised by the some convex part parted in the X-axis direction.
-The structure of said plate lamination type heat exchanger 10 is applicable to the arbitrary joining structures which consist of a structure where the 1st member and the 2nd member were joined by brazing. Moreover, the manufacturing method of said plate lamination type heat exchanger 10 is applicable to the arbitrary joining methods which join the 1st member and the 2nd member which are not restrained at the time of an assembly | attachment by brazing. More specifically, after forming at least one protrusion on the first member and at least one protrusion on the second member, the protrusion of the first member and the protrusion of the second member If it joins by brazing, it is possible to acquire the effect | action and effect similar to the heat exchanger 10 of the said embodiment.

  -This indication is not limited to said specific example. Any of the above specific examples that are appropriately modified by those skilled in the art are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each of the specific examples described above, and the arrangement, conditions, shape, and the like thereof are not limited to those illustrated, and can be appropriately changed. Each element included in each of the specific examples described above can be appropriately combined as long as no technical contradiction occurs.

10: Heat exchanger 11: Plate member (first member)
12: Heat exchange unit 30: Fin (second member)
110, 111, 300, 301: convex part

Claims (3)

A joining structure of the first member (11) and the second member (30),
The first member and the second member each have at least one convex portion (110, 111, 300, 301),
The joint structure in which the convex part of the first member and the convex part of the second member are joined by brazing. A method of joining the first member (11) and the second member (30) that are not constrained to each other during assembly,
Forming at least one protrusion (110, 111) on the first member;
Forming at least one protrusion (300, 301) on the second member;
Joining the convex part of the said 1st member and the convex part of the said 2nd member by brazing. The joining method. A heat exchange unit (12) including a plurality of stacked plate members (11) and having a first flow path through which the first fluid flows and a second flow path through which the second fluid flows between the plurality of plate members. )When,
A fin (30) disposed between the plurality of plate members,
The plate member has at least one protrusion (110, 111) protruding toward the fin,
The fin has at least one protrusion (300, 301) protruding toward the plate member,
A plate stacked heat exchanger in which the convex portions of the plate member and the convex portions of the fins are joined by brazing.

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