JPH0740863Y2 - Header pipe for heat exchanger - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger header pipe, and more particularly to a pipe structure used in a heat exchanger tank.

[0002]

2. Description of the Related Art In a heat exchanger, as shown in FIG. 8, corrugated fins 2 are interposed between flat tubes 1 and 1 made of aluminum and arranged in parallel. There is a structure in which each of them is inserted into a mounting hole of a cylindrical tank header 3 and fixed by integral brazing in a furnace.

Here, as shown in FIG. 9, the tank header 3 uses a brazing sheet 6 in which a brazing material 5 is clad on both sides or one side of a base material 4, and rising pieces 7 formed at both ends thereof. Is formed in a cylindrical shape by abutting toward each other inwardly, and in addition, the following structures are general.

That is, in the pipe shown in FIG. 10, a step portion 8 is provided at one end of the brazing sheet 6, and the step 8 is provided.
A cylindrical shape in which the other end portion 9 is superposed on the portion,
FIG. 11 shows a brazing sheet 6 in which both end portions of the brazing sheet 6 are formed with inclined surfaces 10 and the inclined surfaces 10 are joined and welded to form a cylindrical shape. Further, FIG. It has a structure in which both end faces are welded together.

[0005]

However, since the rising piece 7 in the one shown in FIG. 9 and the stepped portion 8 in the one shown in FIG. 10 project inward, respectively, a partition plate is installed inside the pipe. It is not suitable for brazing end plate lids or the like on the openings at both ends. Further, in the pipes shown in FIGS. 9 and 11, it is difficult to absorb the dimensional deviation, respectively.
The pipe shown in (1) has various problems that it is difficult to obtain easily.

[0006]

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned conventional problems, and enables positioning and temporary fixing during pipe molding to improve productivity. The purpose of the invention is to provide a pipe that does not project inside and outside, and the gist of the invention is to form stepped portions that overlap with each other at both joint ends of the brazing sheet. In the header pipe for a heat exchanger, the pin fixed upright is fitted to a fitting portion formed on the other step surface portion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in FIGS. 1 is a perspective view of a main part of a heat exchanger to which the header pipe according to the present invention is applied, FIG. 2 is a first explanatory view of the manufacturing process of the pipe, and FIG. 3 is a second explanatory view of the manufacturing process. FIG. 4 is a third explanatory view of the same manufacturing process, FIG. 5 is a sectional view of another embodiment pipe, FIG. 6 is a sectional view of another different embodiment pipe, and FIG. 7 is a sectional view of another different embodiment pipe.

In the figure, reference numeral 1 denotes a cylindrical pipe body used for a tank of a heat exchanger. The open end of a flat tube 2 is inserted into the pipe body 1 and fixed by brazing. The main body 1 is formed by the following manufacturing process.

That is, first, as shown in FIG.
Of the brazing sheet 5 which is a relatively thick plate in which the brazing material 4 is clad on both sides or one side thereof, and opposite step surfaces 6 and 7 which overlap each other are formed at both joint ends, and one step surface 6
A pin 8 is vertically fixed on the other end, and a U groove 9 as a fitting part that can be fitted into the pin 8 is formed at the other end on the other step surface part 7. The fitting part 9 may be a circular hole. Good.

Next, the brazing sheet 5 is bent into a cylindrical shape, and as shown in FIGS. 3 and 4, both joint ends thereof are brought close to each other, and both step surface portions 6 and 7 are superposed. After the pin 8 is fitted into the U groove 9 for positioning and temporary fixing, it is integrally brazed and fixed in the furnace.

The pipe body 1 shown in FIG. 5 is another embodiment in which the brazing sheet 5 is molded into a square tube shape, and the pipe body 1 of the rectangular tube shape and the cylindrical shape shown in FIGS. It is formed by joining the upper and lower halves of the cylindrical body 1A, 1B, and is otherwise the same as the above embodiment.

With the above-described structure, the pin 8 and the fitting portion 9 can be used for positioning and temporary fixing when the pipe body 1 is molded, and the inner and outer surfaces of the pipe body 1 have protruding portions. Since it is not present, it is possible to improve the integral brazing property of the partition wall, the cover, the end plate and the like.

[0013]

As described above, the header pipe for the heat exchanger according to the present invention has the stepped portions which are overlapped with each other at both joining ends of the brazing sheet, and is fixed upright on one of the overlapped stepped portions. Since the pin is configured to be fitted with the fitting portion formed on the other step surface portion, the joint end portions are positioned and temporarily fixed by fitting the pin into the fitting portion. Therefore, assembling becomes easier and productivity is improved, and since the stepped portions are overlapped with each other, there are various effects such that the joint can be manufactured without protruding to the inside and outside of the pipe. .

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of a heat exchanger having a header pipe according to the present invention.

FIG. 2 is a first explanatory view of the manufacturing process of the pipe structure.

FIG. 3 is a second explanatory view of the manufacturing process.

FIG. 4 is a third explanatory view of the manufacturing process.

FIG. 5 is a cross-sectional view of another embodiment pipe.

FIG. 6 is a cross-sectional view of another different embodiment pipe.

FIG. 7 is a cross-sectional view of yet another embodiment pipe.

FIG. 8 is a front view of a heat exchanger.

FIG. 9 is a sectional view of a pipe used for a tank header of a conventional heat exchanger.

FIG. 10 is a cross-sectional view of a conventional pipe.

FIG. 11 is a cross-sectional view of a conventional pipe.

FIG. 12 is a cross-sectional view of a conventional pipe.

[Explanation of symbols]

 1 Pipe Main Body 3 Base Material 4 Brazing Material 5 Brazing Sheet 6 Stepped Surface 7 Stepped Surface 8 Pin 9 Fitting Part

Claims (1)

[Scope of utility model registration request] 1. A stepped surface portion mutually overlapping in the joining ends of the brazing sheet when formed respectivelyゝmonitor, overlapping if
A pin fixed upright on one step surface is on the other step surface.
A header pipe for a heat exchanger, characterized in that the header pipe is fitted with the formed fitting portion .