JPH0517385U - End plate structure of heat exchanger - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the pressure resistance of the end plate by closely contacting the joint between the insertion hole and the flat tube inserted in the insertion hole. [Structure] The strip-shaped end plate 10 has a cylindrical wall 13
The end plate structure of the heat exchanger having a structure in which the tube insertion hole 12 having the above is formed, and the ridge portion 14 that is flattened by pressing is diffused between the tube insertion holes 12 and 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat exchanger used for a radiator of an automobile or the like, and particularly to a structure of an end plate for inserting and fixing an end portion of a flat tube.

[0002]

[Prior Art]

 Conventionally, as shown in FIGS. 5 and 7, this type of heat exchanger has a structure including a core portion 1 and water tanks 2 (only one of which is shown in the drawings) arranged above and below the core portion 1. The core part 1 is made of aluminum flat water pipes 3 arranged in parallel, and a strip-shaped end plate 4 for fixing the upper and lower open ends of the flat water pipe 3 (only one is shown in the drawing. ) And a corrugate 5 arranged between the flat water pipes 3.

Then, an insertion hole 6 having the same cylindrical shape as the open end portion 3a of the flat water pipe 3 and having a cylindrical wall 6a on the periphery is opened in parallel in the end plate 4 by burring. The open end portion 3a of the flat water pipe 3 is inserted into each of the insertion holes 6, and the joint portion between the outer periphery of the flat water pipe 3 and the inner peripheral surface of the cylindrical wall 6a is welded and fixed by, for example, a wax. is there. Reference numeral 7 in the drawing denotes locking claws provided upright on both side edges in the longitudinal direction of the end plate 4, and the water tank 2 is caulked by caulking the locking claws 7.

[0004]

[Problems to be solved by the device]

 However, in the conventional end plate structure as described above, as shown in FIG. 7, a gap G is formed at the joint between the flat water pipe 3 and the insertion hole 6 of the end plate 4 during assembly. As a result, welding may be incomplete and water leakage may occur, or the structural strength of this portion may be reduced.

Therefore, as shown in FIG. 8, the opening end 3a of the flat water pipe 3 is pushed and expanded by the pipe expanding jig 8 to form a gap G between the outer periphery of the flat water pipe 3 and the inner peripheral surface of the cylindrical wall 6a. Is being done. However, in this method, as shown in FIG. 9, cracks C occur at the open end 3a of the flat water pipe 3, particularly both ends in the longitudinal direction, and a constriction K occurs near the end, which causes heat exchange. Cooling water inside the unit may leak, causing internal pressure fluctuations, which may lead to a serious accident. Further, as a countermeasure against this, it is possible to improve the rigidity by increasing the plate thickness of the flat water pipe 3 and the end plate 4, but there is a drawback that not only the weight of the heat exchanger is increased but also the cost is increased. .

[0006]

[Means for solving problems]

 The present invention was made in order to solve the above-mentioned conventional problems, in which the joint portion between the insertion hole formed in the end plate and the flat water pipe inserted in this insertion hole is closely attached. The purpose of the present invention is to provide a tube insert hole having a cylindrical wall in a strip plate-shaped end plate. The end plate structure of the heat exchanger is characterized in that a ridge portion is formed which is flattened by diffusion between the holes by diffusion.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in FIGS. 1 is a perspective view showing a part of an end plate of a heat exchanger according to the present invention, FIG. 2 is an enlarged sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a front view of the end plate at the time of starting processing. In the figure, FIG. 4 shows a front view after processing is completed.

In the figure, 10 is an end plate, and a large number of insertion holes 12 having the same sectional shape as the opening end 11 A of the flat tube 11 are formed in parallel in the end plate 10. An upward cylindrical wall 13 is formed on the peripheral edge.

Reference numeral 14 is a ridge (bead), which is formed between the adjacent insertion holes 12 formed in the end plate 10. The ridge 14 extends in the longitudinal direction of the insertion hole 12, and the length thereof is substantially the same as the length of the insertion hole 12, and the ridge 14 is a bead. It is formed by ding processing or embossing processing. In addition, in the illustrated example, the number of the protrusions 14 is one, but the present invention is not limited to this, and it goes without saying that a plurality of protrusions 14 may be formed in a wavy shape.

Therefore, when assembling, first, as shown in FIG. 3, the opening end 11 A of the flat tube 11 is inserted into the insertion hole 12 of the end plate 10, and the opening end 11 A of the cylindrical wall 13 is inserted. Make it protrude from the upper edge. Next, if the ridge 14 of the end plate 10 is placed on the base B of the press machine and the ridge 14 is crushed from above by the press P, the ridge 14 becomes flat and left and right. The cylindrical walls 13 located on the left and right of the ridge portion 14 are pressed against the outer peripheral surface of the flat tube 11 as they are expanded. As a result, as shown in FIG. 4, the joint portion between the flat tube 11 and the insertion hole 12 is brought into close contact with each other. Therefore, this joint is welded by brazing or the like.

[0011]

[Effect of the device]

 In the end plate structure of the heat exchanger according to the present invention, as described above, when the tube insertion hole having the cylindrical wall is formed in the strip-shaped end plate, the diffusion flatness is caused by pressing between the tube insertion holes. Since the ridges are formed to be solidified, the joints are brought into close contact with each other by a simple operation such as crushing the ridges, and the compressive strength of the joints is improved. Moreover, since the tube is not damaged, there are various effects such that the compressive strength of the joint is improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a part of an end plate of a heat exchanger according to the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II in FIG.

FIG. 3 is a front view of the end plate of FIG. 1 at the start of processing.

FIG. 4 is a front view after the processing is finished.

FIG. 5 is a front view in which a part of a heat exchanger to which the present invention is applied is cut away.

6 is an enlarged sectional view taken along line III-III in FIG.

FIG. 7 is a perspective view showing a main part of FIG.

FIG. 8 is a partially cutaway front view showing a processed state of the flat water pipe of FIG. 7.

9 is a perspective view showing a main part after processing of FIG.

[Explanation of symbols]

 10 End Plate 11 Flat Tube 11A Same Open End 12 Insertion Hole 13 Cylindrical Wall 14 Projection

Claims (1)

[Scope of utility model registration request] 1. A heat treatment characterized in that when a tube insertion hole having a cylindrical wall is formed in a strip plate-shaped end plate, a ridge portion is formed between the tube insertion holes to diffuse and flatten by pressing. Exchanger end plate structure.