KR20160021315A

KR20160021315A - Heat exchanger

Info

Publication number: KR20160021315A
Application number: KR1020140105636A
Authority: KR
Inventors: 최상선
Original assignee: (주)누리
Priority date: 2014-08-14
Filing date: 2014-08-14
Publication date: 2016-02-25

Abstract

The present invention relates to a fixing structure of inlet and outlet pipes (40) for heat exchanger. The present invention enables cost reduction by simplifying a manufacturing process, improves air tightness to solve quality problems, and applies a nickel plated pipe (11) to the joint between a copper pipe (10) and an aluminum part by improving coherence, thereby preventing corrosion caused by the potential difference of the dissimilar metal joint. Moreover, the present invention forms an aluminum block and an aluminum welding ring by plating the copper pipe with nickel and plating the nickel plated pipe with aluminum to improve brazing performance, thereby enabling integrated brazing using the same material.

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 improving the bonding force and improving the manufacturability by using only one 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, the pipe of the inlet / outlet 40 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.

Third, the block 20 and nickel-plated (10) pipe can be applied to improve corrosion protection to prevent galvanic corrosion of aluminum on the contact area.

Fourth, one or two welding rings (21) used in a nickel-plated (10) pipe are used to reinforce the weldability of the inside of the block (20) by airtight reinforcement. The welding ring 21 is completely brought into close contact with the block 20 by using the welding ring 21 at a position favorable to melting, thereby completely eliminating the gap between the materials.

Fifth, a partial nickel plating (11) is applied to the copper pipe (10) to prevent corrosion of the potential difference between the dissimilar metals. Nickel is brought into contact with the welded portion with the aluminum block, Lt; / RTI >

By using aluminum material and 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 /
Figs. 2, 3 and 4 are structural diagrams of a copper + nickel plated pipe.
Figs. 5, 6 and 7 are diagrams showing the structure of copper + nickel plating + aluminum-plated pipe.

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, 3, and 4, a structure is formed in connection with bonding of different materials.

The block 20 uses an aluminum alloy and the piping pipe is first inserted into the inside of the block 20 using a pipe 12 of nickel plating on the copper pipe 10.

Then, after the aluminum welding ring 21 is inserted into the outer surface of the nickel-plated pipe 12, the end portion of the nickel-plated pipe 10 is expanded by using the jig to complete the adhesion, and nickel- 10) Prevent rotation and movement of pipe.

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

As shown in Figs. 5, 6, and 7, a structure is formed in connection with bonding of different materials.

The block 20 is made of an aluminum alloy and the piping pipe is first inserted into the inner surface of the block 20 by using a pipe (12) plated with aluminum alloy on the copper pipe 10 on the nickel plating.

Thereafter, the aluminum welding ring 21 is inserted into the outer surface of the aluminum alloy pipe 12 on the nickel plating, and the aluminum alloy is plated on the nickel plating using the jig ((10) , And (10) the aluminum alloy plated pipe on the nickel plated after assembling with the assembly to prevent rotation and movement.

The copper pipe (10) at this time is characterized in that the part of the nickel plating is plated with aluminum alloy (11) so as to have the same material weldability. In the partial nickel plating (11) If necessary, the entire inner side surface can be made of aluminum alloy plating on the nickel plating.

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
12: Aluminum plating site 20: Block
21: welding ring 30:
40: mouth, outlet pipe

Claims

(11) formed on the partial copper surface by a plating (11) formed on the block (20) constituting the inlet and outlet (40) in the piping fixing structure which is interposed in the header (30) of the heat exchanger and the inlet / outlet assembly (10) A structure for fixing an inlet / outlet pipe for a heat exchanger, characterized in that the pipe is assembled and melted by using a melting welding ring (21).

The method according to claim 1,
In order to weld different kinds of materials, the area of the nickel plating (11) is partly plated and outer part of the area, and the inside is made of copper (10) pipe nickel plated (11) Structure of inlet and outlet pipes with aluminum-plated pipe on top.

The method according to claim 1,
By applying the above structure, the position of the welding ring to be welded to the nickel-plated pipe 10 in the block 20 constituting the inlet / outlet 40 has a structure in which brazing and melting are performed irrespective of position in any section Fixed structure of inlet and outlet pipes for heat exchanger.