KR20160020313A

KR20160020313A - Heat exchanger

Info

Publication number: KR20160020313A
Application number: KR1020140105497A
Authority: KR
Inventors: 김진만
Original assignee: 진호테크(주)
Priority date: 2014-08-13
Filing date: 2014-08-13
Publication date: 2016-02-23

Abstract

The present invention relates to a fixing structure of inlet and outlet pipes (40) for a heat exchanger. The present invention enables cost reduction by simplifying a manufacturing process, improves air tightness to solve quality problems, and applies a pipe (11) partially plated with copper to a stainless steel pipe (10) by improving coherence, thereby preventing defects caused by the weight thereof and preventing corrosion caused by the potential difference of the joint of dissimilar metals. The stainless steel pipe (10) partially plated with copper (11) is applied to the inlet and outlet pipes (40) made of different materials.

Description

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

The present invention relates to a fixing structure of a pipe of an inlet and an outlet (40) of a heat exchanger. The present invention simplifies the manufacturing process and can be applied to a cost reduction part. Also, (40) pipe for a heat exchanger which can be prevented from rotation due to its own weight while enhancing the bonding force and improving the manufacturability by using only one stainless steel pipe (10).

Generally, a heat exchanger uses a pair of pipe-type headers having a refrigerant inlet and an outlet inside, and there are a parallel flow type and a vertical flow type in which a refrigerant tube is connected therebetween.

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 is also avaliable, resulting in poor workability and a considerable increase in the cost portion. Therefore, it is necessary to simplify the manufacturing process, to reduce costs, to prevent rotation of products and to prevent corrosion.

To overcome such disadvantages, the present invention provides a fixing structure for assembling dissimilar metal materials to the inlet and outlet pipes 40 in the header 30 of the heat exchanger.

In addition, the existing method has been significantly improved to reduce the process and reduce costs. When the heat exchanger is integrally brazed, the piping of the different metal material is attached to the header and brazed to improve the weldability. do.

In order to achieve the above object, an inlet and outlet pipe manufactured by the method of the present invention is applied.

First, the aluminum block 20 is used to improve the assembling structure of the inlet and outlet, so that the aluminum header 30 can be integrally brazed. At this time, the aluminum block 20 is made into an assembly, and the joining and attaching method with the header 30 pipe is fixed by assembling with a tig welding and a rivet. At this time, a stainless steel pipe is assembled into the block 20, a weld ring 21 for welding is assembled to the outer surface of the block 20, and the inner surface of the stainless steel pipe 10 is closely contacted to the inside of the block 20, (10) 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 of an inlet and an outlet is applied to only a stainless steel pipe, and a pipe is formed and bent so that the pipe is assembled into a block and then brazed integrally.

Thirdly, the block 20 and stainless steel (10) pipe can be applied to prevent corrosion and prevent galvanic corrosion of aluminum on the contact area.

Fourth, one or two welding rings (21) used in a stainless steel pipe (10) are used to strengthen the weldability of the inside of the block (20) by the airtightness strengthening. By using the welding ring 21 at an advantageous position, the welding ring 21 is brought into complete contact with the block 20 to completely eliminate the gap between the materials.

Fifth, the partial copper plating (11) is applied to the stainless steel (10) pipe to prevent corrosion of the potential difference between the dissimilar metals. The welded part with the aluminum block is made to contact with stainless steel, and the connection part with the end pipe is plated So that it can be directly welded with a welding rod.

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 to 7 are exploded views of assembling parts of the inlet and outlet pipe fixing structure.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1, the header 30 for the heat exchanger and the inlet and outlet 40 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 40 The refrigerant flowing into the header 30 moves to the opposite side of the header 30 in a zigzag manner by the action of heat exchange by the radiating fins when the refrigerant flows to the inner surface of the tube, 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.

Therefore, welding after assembling of the header 30 of the aluminum cannula with the pipe of the inlet / outlet 40 to be assembled plays an important role.

As shown in Figs. 2 to 7, are formed in connection with bonding of different materials.

The block 20 uses an aluminum alloy and the pipe pipe is first inserted into the inside of the block 20 using a stainless steel (10) pipe.

Thereafter, the aluminum welding ring 21 is inserted into the outer surface of the stainless steel pipe 10, and the end portion of the stainless steel pipe 10 is expanded by using the jig to complete the adhesion. Further, after assembly with the stainless steel pipe 10, To prevent rotation and movement.

The stainless steel pipe (10) at this time is partially copper plated (11) so as to have a weldability between dissimilar metals. In the partial copper plating (11), plating is performed only up to a portion not in contact with aluminum. If necessary, the entire surface of the inner side can be copper plated.

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: Stainless steel pipe 11: Copper plating part
20: Block 21: Welding ring
30: header 40: mouth, outlet pipe

Claims

A stainless steel 10 having a partial copper plating 11 formed on a block 20 constituting an inlet and an outlet 40 in a piping fixing structure which is interposed in the header 30 of the heat exchanger and the inlet and outlet assembly 40, And has a structure in which the pipe is integrally brazed and melted by using the melting welding ring (21) after assembly.

The method according to claim 1,
The structure of the inlet and outlet pipes using the stainless steel (10) pipe in which the region of the copper plating (11) is partially plated and the outside portion is plated and the inside is plated (11) on the entire surface.

The method according to claim 1,
The above structure is applied so that the position of the welding ring welded to the stainless steel pipe 10 in the block 20 constituting the inlet / outlet 40 has a structure in which the steel pipe 10 is integrally brazed and melted regardless of its position Fixed structure of inlet and outlet pipe for heat exchanger.