JPH04240398A - Heat exchanger - Google Patents

Abstract

PURPOSE:To facilitate the insertion of tubes into inserting holes by a method wherein guides, extended outwardly, are formed on the peripheries of the openings of the inserting holes, in a heat exchanger constituted by inserting both ends of a plurality of flat tubes into inserting holes, formed on a hollow header tube, to connect both of them. CONSTITUTION:A heat exchanger is provided with a plurality of flat tubes 1 arranged in parallel while corrugate fins 2 are interposed between respective tubes 1. The heat exchanger is also provided with hollow header tubes 3 at both of left and right sides and inserting holes 31 are bored along the lengthwise direction of the same with a predetermined interval while both ends of flat tubes 1 are inserted into these inserting holes 31 to connect both of them. In this case, the inserting hole 31 is formed so as to have a size same as the sectional configuration of the end of the flat tube 1 substantially at an opening 32 on the inner wall side of the header tube 3 while a taper section 34, enlarged from the inner wall of the header tube 3 toward the outer wall of the same, is formed on a long side at the periphery of an opening 33 of the outer wall side of the header tube. Tapered guide sections 35 are formed on a short side in the same manner.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger used in refrigeration equipment and the like.

0002

2. Description of the Related Art A heat exchanger used in a refrigeration system or the like is constructed by connecting a plurality of flat tubes arranged in parallel to a pair of hollow header tubes. This heat exchanger is assembled by inserting both ends of each flat tube into insertion holes drilled at predetermined intervals in the header tube, and then joining them by brazing.

0003

[Problems to be Solved by the Invention] In conventional heat exchangers, the insertion hole is formed with dimensions that almost match the shape of the tip of the flat tube in order to avoid the occurrence of poor brazing between the header pipe and the flat tube. was. For this reason, it is not always easy to insert the flat tube into the insertion hole, which increases the time required to assemble the heat exchanger, or poses a problem in automatically inserting the flat tube.

[0004] In order to solve the above-mentioned problems, the present invention aims to provide a means for easily inserting a flat tube into an insertion hole.

[0005]

[Means for Solving the Problems] The present invention has solved the above problems, in which both ends of a plurality of flat tubes arranged in parallel are connected to an insertion hole bored in a hollow header pipe. In the heat exchanger, a taper part is formed around the opening of the insertion hole, and a tapered part that expands from the inner wall side to the outer wall side of the header pipe is formed on the long side, and the header pipe is formed on the short side. The present invention relates to a heat exchanger characterized in that a guide portion is formed in a tapered shape toward the outside of the tube.

[0006]

[Operation] Since the heat exchanger of the present invention has the above structure, the area around the open end of the insertion hole in which the tapered part and the guide part are formed is wider than the cross section of the tip of the flat tube. Therefore, when assembling the heat exchanger, the flat tube is guided along the tapered part and the guide part and easily inserted into the insertion hole.

[0007]

[Example] Fig. 1 is a front view of a heat exchanger according to an embodiment of the present invention, Fig. 2 is a perspective view of a flat tube of the same embodiment, and Fig. 3 is a perspective view of the main part of a header pipe of the same embodiment. 4 is a cross-sectional view taken along the line II--II in FIG. 3, and FIG. 5 is a cross-sectional view taken along the line II--II in FIG. In the figure, reference numeral 1 indicates a plurality of flat tubes arranged in parallel, each having a flat cross section. In addition to hollow tubes, tubes 1 have built-in corrugated fins, or have multi-holes called harmonica tubes. Shapes, etc. are used. 2
is a corrugated fin inserted between one flat tube,
It is processed into a wave shape. Reference numeral 3 designates hollow header tubes erected on both the left and right sides, and insertion holes 31 for connecting the flat tubes 1 are bored at predetermined intervals along the length of the header tubes. The insertion hole 31 has substantially the same dimensions as the cross-sectional shape of both ends of the flat tube 1 at the opening 32 on the inner wall side of the header tube 3 . In addition, around the opening 33 on the outer wall side of the header tube 3, a tapered portion 34 is formed on the long side (corresponding to the width direction of the flat tube 1) that expands from the inner wall toward the outer wall of the header tube 3. It is formed. Here, the taper portion 34 extends over the entire length of the long side, and
It may be formed locally. On the other hand, on the short side (corresponding to the thickness direction of the flat tube 1), the header tube 3
A guide portion 35 is formed that tapers outward. The guide portion 35 can be formed, for example, by cutting and raising a portion of the tube plate of the header tube 3 using a cutting blade 5 as shown in FIG.

In this way, the periphery of the opening 33 of the insertion hole 31 in which the tapered part 34 and the guide part 35 are formed is wider than the cross-sectional dimension of the tip of the flat tube 1, so that heat exchange is possible. In assembling the container, the flat tube 1 is guided along the tapered part 34 and the guide part 35,
It can be easily inserted into the insertion hole 31. Moreover, as a result, automatic insertion of the flat tube 1 into the insertion hole 31 becomes possible. Furthermore, since the flat tube 1 is closely fitted to the opening 32 on the inner wall side of the header pipe 3, no brazing failure occurs.

In FIG. 1, 4 is a side plate that protects the outermost fin 2.
When inserting and connecting to the header pipe 3, a tapered part 34 and a guide part 35 can be formed around the opening of the insertion hole 31 drilled in the header pipe 3, as in the case of the flat tube 1. The side plate 4 can be easily inserted and connected to the hole 31.

0010

Effects of the Invention In the heat exchanger of the present invention, a tapered portion is formed around the opening of the insertion hole on its long side, expanding from the inner wall side to the outer wall side of the header pipe, and Since a guide part is formed on the side of the header tube in a tapered shape toward the outside of the header tube, during assembly, the flat tube is guided along the tapered part and the guide part, and can be inserted easily and accurately. This shortens assembly time and allows automatic insertion of flat tubes.

[Brief explanation of the drawing]

FIG. 1 is a front view of a heat exchanger according to an embodiment of the present invention.

FIG. 2 is a perspective view of the flat tube of the same embodiment.

FIG. 3 is a perspective view of the main parts of the header pipe of the same embodiment.

FIG. 4 is a cross-sectional view taken along line II in FIG. 3;

FIG. 5 is a cross-sectional view taken along line II-II in FIG. 3;

FIG. 6 is a diagram showing the processing state of the header pipe of the above embodiment.

[Explanation of symbols]

1 Flat tube 2 Corrugated fin 3 Header pipe 4 Side plate 5 Cutting molding blade 31 Insertion hole 32 Opening on the outer wall side 33 Opening on the inner wall side 34 Taper part 35 Guide part

Claims (1)

[Claims] Claims: 1. A heat exchanger comprising a plurality of flat tubes arranged in parallel, both ends of which are connected in communication with an insertion hole bored in a hollow header tube, around the opening of the insertion hole, A tapered portion that expands from the inner wall side to the outer wall side of the header pipe is formed on the long side, and a guide portion that expands in a tapered shape toward the outside of the header pipe is formed on the short side. A heat exchanger characterized by: