KR101705409B1 - Manufacturing method of heat exchanger - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a heat exchanger for cooling a fluid such as cooling water or oil and more particularly to a method of manufacturing a heat exchanger And a method for producing the same.

Description

[0001] Manufacturing method of heat exchanger [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a heat exchanger for cooling a fluid such as cooling water or oil and more particularly to a method of manufacturing a heat exchanger And a method for producing the same.

Generally, in driving an engine such as a ship or an automobile, the temperature of the combustion gas in the combustion chamber reaches 2000 ° C or more, and a considerable amount of this temperature is conducted to the cylinder, the cylinder head, the piston, and the valve.

If the temperature of such a portion becomes excessively high, the strength of the component material is lowered, resulting in failure, shortening the life span, and deteriorating the combustion state, resulting in knocking or early ignition.

Further, in the state where the cooling is incomplete, the lubricating function such as the oil film on the cylinder wall is cut off, and the cooling water may be deteriorated, resulting in abnormal wear, pressing, or the like. On the contrary, if the engine is over cooled, the amount of heat lost due to cooling is large among the heat generated from the combustion, so that the thermal efficiency of the engine is lowered and the fuel consumption is increased. In this way, the heated cooling water passing through the engine must be cooled to a proper level through a heat exchanger called a radiator.

The radiator includes an upper tank formed with an inlet through which cooling water flows, a lower tank formed with a drain hole, and a radiator core cooling the cooling water introduced from the upper tank by external air flowing in a direction orthogonal to the cooling water.

In the conventional radiator, first, each component of the radiator core is assembled and brazed to complete the assembly, upper and lower tanks are joined to the radiator core, pipes for supplying and discharging cooling water to the upper and lower tanks, Are manufactured by working individually.

At this time, the joining between the respective tanks and the radiator and the joining of the pipes to the respective tanks in the above process are performed by brazing welding or TIG (Tungsten Inert Gas) welding.

In the TIG welding, an inert gas such as argon (Ar) or helium (He) is shielded from an arc and a molten portion in a touch using a tungsten rod as an electrode, thereby preventing intrusion of oxygen and nitrogen in the atmosphere, And an arc is generated to dissolve the base material and the filler material in the heat.

The above TIG welding has a very good advantage in welding thin plate because it is easy to adjust the heat input of welding, and is mainly used for bonding upper and lower tanks to a radiator core in particular. However, bonding the radiator core to the upper and lower tanks through TIG welding is disadvantageous in that the TIG welding is relatively slow in welding speed and is costly as compared with other welding methods.

On the other hand, when the upper and lower tanks are made of a clad aluminum alloy material on the radiator core and joined by brazing welding, the process is simplified compared to TIG welding, but the bonding strength is lowered.

1. Korean Patent Publication No. 10-2013-0101743 2. Korean Patent Publication No. 10-2013-0117421 3. Korean Patent No. 10-1374925

SUMMARY OF THE INVENTION It is an object of the present invention to provide a brazing rod insertion groove and a brazing rod insertion groove at the ends of upper and lower tanks so that the brazing rod and the cladding together with the brazing and lower tanks The present invention provides a method of manufacturing a heat exchanger which can improve the bonding strength and airtightness compared to conventional clad aluminum alloys and can reduce time and cost compared to the conventional TIG welding method.

To this end, a method of manufacturing a heat exchanger according to the present invention includes: A lower tank spaced apart from the upper tank; And a core disposed between the pair of the header and the pair of the header and the header, respectively, the method comprising the steps of: providing the upper and lower tanks; Providing the cores with a header formed on both sides thereof; The upper and lower tanks each having an insertion portion into which both side ends of the header are inserted and forming a brazing rod receiving groove inside the insertion portion; Inserting a brazing rod into the brazing rod receiving groove; Joining the upper and lower tanks to the core by inserting an end of the header into the inserting portion; And joining the upper and lower tanks to the header by inserting a core coupled to the upper and lower tanks into a brazing furnace and heating the upper and lower tanks.

According to another aspect of the present invention, there is provided a method of manufacturing a heat exchanger, comprising: forming a clad layer on the inner surface of the insert or the outer surface of the header before coupling the upper and lower tanks to the core .

In addition, the upper and lower tanks of the heat exchanger according to the present invention are coupled with the core, and brazing is performed in a state where the outer side of the insertion portion is squeezed to reduce a clearance between the insertion portion and the header.

Further, the inserting portion of the heat exchanger according to the present invention is characterized by comprising a bottom portion and a skirt portion bent at both sides of the bottom portion.

Further, the brazing rod receiving groove of the heat exchanger according to the present invention is formed on the side of the bottom portion or the skirt portion, or is formed at an edge between the bottom portion and the skirt portion.

The brazing rod accommodating groove of the heat exchanger according to the present invention includes a receiving portion for receiving the brazing rod, a fixing protrusion for fixing the brazing rod, an opening for communicating with the accommodating portion and discharging the brazing rod, .

According to the method of manufacturing a heat exchanger of the present invention having the above-described structure, the inserting portion and the brazing rod insertion groove are formed at the ends of the upper and lower tanks, so that the brazing rod and the clad are closely contacted with the header, Bonding strength and airtightness are improved as compared with the conventional clad aluminum alloy, and the time and cost can be reduced as compared with the conventional TIG welding method.

1 is a perspective view showing a heat exchanger according to the present invention.
FIG. 2A is a cross-sectional view showing the header of the present invention combined with upper and lower tanks, and FIG. 2B is a sectional view showing a state in which a brazing rod receiving groove is formed in the insertion portion of the present invention.
3 is a perspective view showing a state in which a brazing rod is inserted into a receiving groove of the present invention.
FIG. 4 is a cross-sectional view showing a state where the upper and lower tanks of the present invention and the core are joined together.
5 is a cross-sectional view showing a state in which the insert portion of the present invention is squeezed.
FIGS. 6A and 6B are a perspective view and a cross-sectional view showing a state in which the upper and lower tanks of the present invention and the coupled core are brazed.

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

FIG. 1 is a perspective view showing a heat exchanger according to the present invention, and FIG. 2 (a) is a sectional view showing a state where a header of the present invention and upper and lower tanks are combined.

1 to 2A, a heat exchanger 100 according to the present invention includes an upper tank 110, a lower tank 110a spaced apart from the upper tank 110, And a core 130 disposed between the pair of the headers 131 and 131. The pair of headers 131 and 131 are connected to the headers 110 and 110a.

The upper tank 110 is formed with an inlet through which the heated fluid flows. The lower tank 110a is formed with an outlet through which the fluid to be cooled flows through the upper tank 110 and flows through the core 130. [ The fluid is not particularly limited and may be water or oil.

An inlet pipe 151 and an outlet pipe 153 are connected to the inlet and the outlet, respectively.

The core 130 has a structure in which a fluid can flow between a pair of headers 131 that are spaced apart from each other and a pair of the headers 131. The structure of the core 130 includes There are no special restrictions. The structure of such cores is disclosed in Korean Patent Laid-Open Nos. 10-2013-0101743, 10-2013-0117421 and Korean Patent No. 10-1374925, and a detailed description thereof will be omitted.

The header 131 is joined to the upper and lower tanks 110 and 110a by brazing. For this purpose, the upper and lower tanks 110 and 110a and the header 131 may be made of an aluminum alloy having a clad layer .

However, since it is difficult to ensure sufficient bonding strength and airtightness with only the clad layer, the present invention has a U-shaped insertion portion 111 in which both ends of the header 131 are inserted into the upper and lower tanks 110 and 110a, And a brazing rod receiving groove 115 into which a brazing rod is inserted is formed inside the inserting portion 111.

Hereinafter, a method of manufacturing a heat exchanger according to the present invention will be described in detail with reference to the accompanying drawings.

The method of manufacturing the heat exchanger according to the present invention can be roughly divided into steps S1 to S6.

Referring again to FIGS. 1 to 2A, steps S1 and S2 are steps of providing upper and lower tanks 110 and 110a and a core 130, respectively.

Each of the upper and lower tanks 110 and 110a has a semi-cylindrical shape and may be extrusion-molded.

A header 131 is formed on both sides of the core 130 and the header 131 is formed in a shape corresponding to the upper and lower tanks 110 and 110a and press-formed.

The upper and lower tanks 110 and 110a or the header 131 may be formed of a metal or an alloy and a sheet-like clad layer 121 may be formed on the surface thereof (see FIG. 4).

The cladding layer 121 has a melting point lower than that of the metal or alloy and is melted during brazing.

The upper and lower tanks 110 and 110a, the header 131 and the cladding layer may be made of an aluminum alloy. The aluminum alloy constituting the cladding layer may include upper and lower tanks 110 and 110a, aluminum Alloy has a melting point lower than that of the alloy. Therefore, in the brazing furnace to be described later, the upper and lower tanks 110 and 110a and the header 131 are heated to a temperature at which only the clad layer 121 can be melted without melting. When the cladding layer 121 is melted in the brazing furnace, a fillet is generated to join the upper and lower tanks and the header.

FIG. 2B is a sectional view showing a state in which a brazing rod receiving groove is formed in the insertion portion of the present invention, and FIG. 3 is a perspective view showing a state in which a brazing rod is inserted into the brazing rod receiving groove of the present invention.

Referring to FIGS. 2B and 3, in step S3, the upper and lower tanks 110 and 110a are provided with insertion portions 111, through which both ends of the header 131 are inserted, Thereby forming a brazing rod receiving groove 115 in the brazing rod receiving groove 115.

The insertion portion 111 includes a bottom portion 112 and a skirt portion 113 bent at both sides of the bottom portion 112. The insertion portion 111 may have a substantially U shape.

The insertion portion 111 is formed with a brazing rod receiving groove 115.

The brazing rod receiving groove 115 may be formed at an edge between the bottom portion 112 and the skirt portion 113 as shown in FIG. may be formed on the sides of the skirt portion 113 or the bottom portion 112, as shown in FIG.

The brazing rod receiving groove 115 may include a receiving portion 116, a fixing protrusion 118, and an opening 117.

The receiving portion 116 is recessed from the inner surface of the insertion portion 111 to receive the brazing rod 120 and corresponds to the brazing rod 120 as shown in FIGS. For example, a circular or rectangular cross-section.

The fixing protrusion 118 prevents the brazing rod 120 from escaping from the accommodating portion 116 and the opening 117 is communicated with the accommodating portion 116 so that the melted brazing rod 120 And is opened to be discharged through the gap between the insertion portion 111 and the header.

In step S4, the brazing rod 120 is inserted into the brazing rod receiving groove 115.

FIG. 4 is a cross-sectional view showing a state where the upper and lower tanks of the present invention and the core are joined together, and FIG. 5 is a sectional view showing a state where the insertion portion of the present invention is squeezed.

4 and 5, step S5 is a step of joining the upper and lower tanks 110 and 110a and the core 130 by inserting the end of the header 131 into the insertion part 111. [

Specifically, the ends of the header 131 are inserted into the inserting portion 111 so that the upper and lower tanks 110 and 110a and the core 130 are joined together. 1, an inlet pipe 151 and an outlet pipe 153 are coupled to one end of the upper and lower tanks 110 and 110a, and a tank sealing plug 155 is coupled to the other end.

However, in a state where the upper and lower tanks 110 and 110a and the core 130 are joined together, a clearance is formed between the insertion portion 111 and the end portion of the header 131.

5, after the upper and lower tanks 110 and 110a are joined to the core 130 in order to minimize the gap between the insertion portion 111 and the header 131, Is pressed by a jig device. The jig device includes an upper and lower tanks 110 and 110a and an inner rod Z2 inserted into a space defined by the header 131 and disposed inside the skirt 113. The skirt 113 And an outer rod Z1 disposed on the outer side of the outer rod Z1.

FIGS. 6A and 6B are a perspective view and a cross-sectional view showing a state in which the upper and lower tanks of the present invention and the coupled core are brazed.

6A and 6B, in step S6, the core 130 coupled with the upper and lower tanks 110 and 110a is inserted into the brazing furnace B and heated to heat the upper and lower tanks 110 and 110a, (131).

When heating is performed in the brazing furnace B, the brazing rod 120 housed in the brazing rod receiving groove 115 and the cladding layer 121 formed on the header 131 are melted and fused together.

The brazing rod 120 is melted together with the clad layer 121 in the present invention and they are melted together with the clad layer 121 by the capillary phenomenon, The header 131 and the insertion portion 111 are closely coupled while moving toward the skirt portion 113 and the bottom portion 112 by the inner surface of the base 111 and the header 131. [

As described above, in the present invention, since the brazing rod insertion groove is formed in the insertion portion and the brazing rod is brazed to closely adhere the upper and lower tanks to the header, the bonding strength and airtightness are improved as compared with the conventional clad aluminum alloy, It is possible to reduce time and cost compared with the conventional method.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities. Accordingly, the scope of the present invention should be construed as being limited to the embodiments described, and it is intended that the scope of the present invention encompasses not only the following claims, but also equivalents thereto.

100: heat exchanger
110, 110a: upper tank, lower tank 111:
112: bottom part 113: skirt part
115: Brazing rod receiving groove 116:
117: opening 118: fixing protrusion
120: Brazing rod 121: Cladding layer
130: core 131: header
151: Inflow pipe 153: Outflow pipe
155: tank sealing plug Z: jig device
B: With brazing

Claims (6)

Upper tank; A lower tank spaced apart from the upper tank; And a core disposed between the pair of headers and the pair of headers, the pair of headers being coupled to the upper and lower tanks, respectively,
Providing the upper and lower tanks;
Providing the core with a header formed on both sides;
The upper and lower tanks each having an insertion portion into which both side ends of the header are inserted and a brazing rod receiving groove having both ends opened inside the insertion portion;
Providing a rod-shaped brazing rod;
Inserting the brazing rod through the open end of the brazing rod receiving groove;
Joining the upper and lower tanks to the core by inserting an end of the header into the inserting portion;
Compressing the pair of skirts vertically in a direction orthogonal to a direction in which the header is inserted into the inserting unit by using a jig device after the upper and lower tanks are coupled with the core;
And joining the upper and lower tanks to the header by inserting a core coupled to the upper and lower tanks into a brazing furnace and heating the core,
Wherein the brazing rod receiving groove comprises a receiving portion for receiving the brazing rod, a fixing projection for fixing the brazing rod, and an opening through which the brazing rod melted during brazing is discharged,
The diameter of the accommodating portion is formed to be larger than the gap of the opening so that the brazing rod can not escape through the opening before the brazing rod is melted,
Wherein the inserting portion comprises a bottom portion and a pair of skirt portions bent at both sides of the bottom portion,
Wherein the jig device comprises upper and lower tanks, an inner rod inserted in a space defined by the header and disposed inside the skirt, and an outer rod disposed on the outer side of the skirt, And brazing is performed in a state that the skirt portion is pressed up and down, so that the inserting portion and the header are closely bonded.
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