KR20160005403A

KR20160005403A - Heat exchanger

Info

Publication number: KR20160005403A
Application number: KR1020140084264A
Authority: KR
Inventors: 김진만
Original assignee: 진호테크(주)
Priority date: 2014-07-07
Filing date: 2014-07-07
Publication date: 2016-01-15

Abstract

The present invention relates to a fixing structure of a pipe of an inlet and an outlet (20) of a heat exchanger, and can be applied to a reduction in cost by simplifying a manufacturing process. In order to improve a quality problem, So that defects can be prevented by rotation of the copper (copper) pipe 22 by its own weight, and the corrosion of the potential difference corrosion of the joint portion can be prevented due to the dissimilar metal. And a fixing structure of the inlet / outlet pipe 20 for the heat exchanger having such advantages.
The inlet and outlet ports 20 of different materials having the above functions can be assembled into a single body brazing by using the brazing furnace after assembly with the header pipe 10.

Description

Fixing structure of inlet pipe for heat exchanger {HEAT EXCHANGER}

The present invention relates to a fixing structure of a pipe at the inlet and outlet of a heat exchanger, which can simplify the manufacturing process and can be applied to a cost reduction type. Also, the airtightness is enhanced. To an inlet / outlet pipe (20) for a heat exchanger.

The heat exchanger has a pair of pipe-type headers in which refrigerant enters and exits, and there are a parallel flow type and a vertical flow type in which a refrigerant tube is connected between them.

The refrigerant flowing into one header of the heat exchanger having such a structure flows through the refrigerant tube and flows to the other header, and is heat-exchanged with the outside in the heat exchanger. The refrigerant circulates in the heat exchanger several times in a zigzag manner to heat exchange the refrigerant of the initial high-temperature and high-pressure gas to the refrigerant of the high-pressure liquid gas, and the refrigerant is sent to the outlet pipe connected to the outlet header.

Thus, in the manufacturing process of the heat exchanger, the heat exchange fins are joined to the refrigerant tube by various bonding methods and the header is bonded to the refrigerant tube.

In the system structure at this time, the piping pipes of the inlet and outlet connected to the heat exchanger are generally made of copper material.

Therefore, even if the piping of the copper (copper) material inlet and outlet is directly welded to the header of aluminum, the melting point is different due to the welding between copper and aluminum, and welding is difficult and moisture is directly contacted with the area where aluminum and copper , Galvanic corrosion occurs due to the potential difference in the parts of aluminum and copper (copper), resulting in refrigerant leakage.

Thus, the conventional fixing structure of the inlet and outlet is also complicated, and the manufacturing process also becomes an avenue, resulting in poor workability and an increased cost portion. Therefore, it is necessary to simplify the manufacturing process, to reduce costs, to prevent rotation of products and to prevent corrosion.

In order to solve the above-mentioned disadvantages, the present invention provides a fixing structure for assembling dissimilar materials to the inlet and outlet pipes in the header of the heat exchanger.

In addition, the existing method has been greatly improved to reduce the process and reduce cost, and to improve the weldability of the heat exchanger, even if the pipe of the different material is brazed to the header when the heat exchanger is integrally brazed .

In order to achieve the above object, the inlet and outlet pipes manufactured by the four methods of the present invention are applied.

First, an aluminum block 21 is used to improve the assembling structure of the inlet and outlet, so that the aluminum header 10 can be integrally brazed. At this time, the aluminum block 21 is made into an assembly, and the joining and attaching method to the header 10 pipe is fixed by assembling with a tig welding and a rivet. At this time, before the copper (22) pipe is assembled into the block (21), a stainless steel pipe (23) is inserted into the opposite side (outer surface) of the header (10) The weld rings 24 and 25 for welding are assembled into the inside of the blocks 21a and 21b and the inner surfaces 22a and 22b of the copper pipe 22 are closely contacted to the inside of the blocks 21a and 21b, ) (22) Fix the pipe.

Secondly, as a cost-saving structure, conventional stainless steel pipes are assembled. After copper pipe is assembled, solder-copper alloy welding is used for welding. As shown in Fig. In order to solve this problem, the present invention is a structure for eliminating all of the above processes, in which a pipe is formed and bent at an inlet and an outlet, assembled to a block, fixed with respect to the pipe, and then brazed and welded.

Third, by improving the corrosion prevention, stainless steel (23) pipe can be inserted into the contact portion between the block (21) and the copper (copper) pipe to prevent galvanic corrosion of the aluminum.

Fourth, one or two welding rings 24 and 25 used in a copper (copper) pipe are used to reinforce the weldability of the inside of the block 21 by airtightness strengthening, and copper (copper) The pipes are expanded (22a, 22b) so that the welding rings (24, 25) are brought into complete contact with the block (21) to completely eliminate the gap between the materials.

At this time, one welding material of two welding rings may include silver + copper alloy.

By using the aluminum material and the dissimilar metal material constituting the heat exchanger of the present invention, it is possible to further improve the manufacturing process, cost reduction, and quality.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural view showing a header of a heat exchanger and an inlet /
2 is an exploded view of the assembly parts of the inlet and outlet pipe fixing structure.
3 is an exemplary view showing a state where assembled parts of the inlet and outlet pipe fixing structure are assembled.
4 and 5 are views showing a manner of fixing the copper pipe after the assembly of the inlet and outlet parts.
6 is a view showing a weld flow region after the inlet and outlet parts are melted.
Figs. 7 and 8 show the pipe extending from the inside after assembling the pipe to the block.

Hereinafter, embodiments according to the present invention will be described in detail.

1, the header 10 for a heat exchanger and the inlet and outlet 20 are assembled so that the refrigerant can be circulated to the inlet and the outlet after the integral welding, and the refrigerant flows into the inlet 20 The refrigerant flowing into the header 10 moves to the opposite header, and when the refrigerant flows to the inner surface of the tube, the heat exchanging action by the radiating fins is moved zigzag one or more times, and finally, So that the next cycle is executed.

The material of the heat exchanger to be used at this time is usually made of aluminum alloy. Copper (copper) pipes are used for the piping pipes required for the end portion and the next stroke of the inlet and outlet.

So that welding after assembly of the header 10 of the aluminum cannula with the pipe of the inlet / outlet 20 to be assembled plays an important role.

As shown in Figs. 2 to 7 and the like.

The block 21 is formed using an aluminum alloy and a stainless pipe 23 is first inserted into the inner surface 21c of the block 21 on the inner surface of the copper 22, Passes through the inner surface of the pipe 23, and is inserted to the end of the block 21.

Thereafter, the silver-copper alloy welding ring 25 is first inserted into the outer surface of the copper (copper) pipe 22, and then the secondary welding ring 24 is inserted outward. At this time, the welding ring 25 of the silver-copper alloy can be brought into close contact with the inside of the block 21b. In order to make the secondary welding ring 24 come into close contact with the inside of the block 21a, The copper pipes 22a and 22b are expanded in the same shape as the end portions 22a and 22b of the pipe so as to have a perfect adherence and after the assembly of the copper pipe 22, (22a, 22b) by using a jig to change the shape of the end portion.

Figure 6 is a supplementary description of the coupling structure.

Copper alloy welding ring 25 is seated in the inner groove 21b of the block 21 and is then subjected to integral brazing so that the molten welded material 21e is welded to the copper pipe 22 and the block inner side 21c And the stainless steel pipe 22 is filled with the welded material 21e of the welding ring 25. [ Copper alloy welding ring 25 having an affinity for weldability between dissimilar metals is used and the end of the copper pipe 22 is welded to the end of the welding ring 24 using a weld ring 24 made of aluminum, (22) pipe for welding between the pipe (21) and the copper (22) pipe for the purpose of welding the pipe (21) The gap between the copper (copper) pipe 22 and the stainless steel pipe 23 is made to be a silver-copper alloy welding ring 25 so that the potential difference corrosion occurs And the degree of bonding between the stainless steel pipe 23 and the block 21 can be prevented by using the copper alloy welding ring 25 to prevent potential difference corrosion.

As described above, the basic conditions for the components of the components for constructing the heat exchanger of the present embodiment are satisfied, and it is possible to solve all the problems and workability in piping connection with the aluminum header 10 with the alloy of the dissimilar metals .

7, 8, and the like are expanded from the inside after assembling the pipe to the block.

Alternatively, after inserting the copper pipe 22 into the block 21 to construct the inlet / outlet 20, the welding ring 24 or the welding ring 25 is assembled and then the expanded pipes 21a, 21b.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The technical idea of the present invention should not be construed as being limited.

10: Header 20: I / O assembly
21: block 21a: inside the block
21b: inside the block 21c: inside the block
21d: welding ring (23) melt: 21e: welding ring (24)
22: copper (copper) pipe 22a:
22b: Expansion of the end portion 23: Stainless pipe
24: welding ring (aluminum) 25: welding ring (silver-copper)

Claims

A pipe 22 and a pipe 22 are connected to a block 21 constituting an inlet and an outlet 20 in a piping fixing structure which is interposed in the header 10 of the heat exchanger and the inlet and outlet assembly 20, And a structure in which the pipe (23) is assembled and melted together with the header (10) by melting welding rings (24, 25).

The method according to claim 1,
The welding rings 24, 25 used for welding different materials may be one or more than one
Wherein the material of the welding ring is applied in accordance with the characteristics of the integral brazing, thereby fixing the inlet and outlet pipe for the heat exchanger.

The method according to claim 1,
By applying the above structure, a copper (22) pipe is assembled to the block (21) constituting the inlet / outlet (20) and then melted together with the header (10) by using the melting welding ring Wherein the inlet and outlet pipes are fixed to each other.