KR100895357B1 - Method for bonding of refrigerants charging tube of flat plate heat spreader - Google Patents

Abstract

TECHNICAL FIELD This invention relates to the method of joining the tube for refrigerant injection in the manufacturing method of a plate-shaped heat transfer apparatus.

According to the present invention, (a) positioning the upper and lower cases so as to form a receiving space for receiving the heat transfer medium therein and forming a mounting hole through which the refrigerant injection tube is inserted; (b) preparing a welded base material whose shape is deformed in correspondence with the shape of the tube to be inserted into the mounting hole portion seated along the junction of the upper and lower cases and into which the refrigerant injection tube is inserted; (c) inserting the refrigerant injection tube into the mounting hole and placing the prepared welding base material on the junction of the upper and lower cases to form a case assembly; And (d) bonding the upper and lower cases to the refrigerant injection tube by melting the welding base material of the case assembly.

Plate Heat Transfer Device, Brazing, Refrigerant Injection Tube, Joining Process

Description

Method for bonding of refrigerants charging tube of flat plate heat spreader

The following drawings, which are attached to this specification, illustrate exemplary embodiments of the present invention, and together with the detailed description of the present invention, serve to further understand the technical spirit of the present invention. It should not be construed as limited to.

1 and 2 are views showing a method for bonding a conventional refrigerant injection tube.

3 is a perspective view illustrating a case assembly before bonding in a tube bonding process for refrigerant injection of a plate heat transfer apparatus according to an exemplary embodiment of the present invention.

4 is a cross-sectional view illustrating a portion A of the cross section taken along the line BB ′ of FIG. 3.

5 is a cross-sectional view illustrating a portion A of the cross section taken along the line CC ′ of FIG. 3.

FIG. 6 is a cross-sectional view of part A after bonding in a tube bonding process for refrigerant injection in a plate heat transfer apparatus according to an exemplary embodiment of the present invention.

7 is a flowchart illustrating a step-by-step method of bonding the tube for refrigerant injection of the plate-shaped heat transfer apparatus according to an embodiment of the present invention.

<Description of Major Reference Marks in Drawing>

110: upper case 120: lower case

130 welding base material 140 refrigerant injection tube

The present invention relates to a method for manufacturing a plate heat transfer apparatus, and more particularly, to a method for joining a tube for refrigerant injection of a plate heat transfer apparatus.

In recent years, electronic devices such as notebook computers and PDAs have become smaller and smaller in thickness due to the development of high integration technology. In addition, the demand for high responsiveness and functional improvement of electronic equipment is increasing, the power consumption is also gradually increasing.

Accordingly, a lot of heat is generated from the electronic components therein during the operation of the electronic equipment, various plate heat transfer devices are used to release the heat to the outside.

In the plate heat transfer apparatus, a heat transfer medium such as a screen mesh is inserted between a lower case and an upper case to form a case assembly, joining the lower case and the upper case, leaving only the refrigerant inlet, and then injecting refrigerant into the case and closing the refrigerant inlet. Production is completed by final sealing. At this time, the bonding method of the lower case and the upper case is mainly used TIG welding method, laser welding method, soldering method or brazing method.

1 and 2 are views showing a method for bonding a conventional refrigerant injection tube.

Looking at the process of bonding the conventional refrigerant injection tube with reference to the drawings, first, as shown in Figure 1, the upper case 10 and the lower case 20 through the welding base material 30, then prepared refrigerant injection Drill a hole 50 into which the tube 40 can be inserted.

Thereafter, as shown in FIG. 2, the refrigerant injection tube 40 is inserted into the hole, and the contact portion 51 of the case and the tube is welded or bonded.

However, the conventional method of joining the tube for refrigerant injection has a problem that the process is increased because the tube for refrigerant injection is separately joined after the case is joined, thus increasing the manufacturing time of the plate heat transfer device. In addition, if the tube connection is incorrect due to the addition of the process, the entire product becomes a defective product increases the defective rate has a disadvantage that leads to a decrease in productivity.

The present invention has been made to overcome the above-mentioned problems of the prior art, and an object thereof is to provide a method that can simplify the process of bonding the refrigerant injection tube in the manufacture of a plate heat transfer device.

In addition, another object of the present invention is to provide a method of reducing the defect rate by improving the bonding method of the tube for refrigerant injection during the manufacturing process of the plate heat transfer device.

Other objects and advantages of the invention will be described below and will be appreciated by the embodiments of the invention. Furthermore, the objects and advantages of the present invention can be realized by means and combinations indicated in the appended claims.

In the tube joining method for refrigerant injection of the plate-shaped heat transfer apparatus according to the present invention for achieving the above object, (a) the upper and lower cases are placed so as to form a receiving space for receiving the heat transfer medium therein and penetrates the inside; Forming a mounting hole into which the refrigerant injection tube is to be inserted; (b) preparing a welded base material whose shape is deformed in correspondence with the shape of the tube to be inserted into the mounting hole portion seated along the junction of the upper and lower cases and into which the refrigerant injection tube is inserted; (c) inserting the refrigerant injection tube into the mounting hole and placing the prepared welding base material on the junction of the upper and lower cases to form a case assembly; And (d) bonding the upper and lower cases to the refrigerant injection tube by melting the welding base material of the case assembly.

Preferably, the step (b) is to modify the shape of the welding base material to surround the upper semicircle of the tube mounting.

Further, the step (b), it is preferable to deform the shape of the welding base material to form a through-hole surrounding the circle of the tube mounting hole.

In addition, the welding base material is preferably a welding wire bent or pressed to correspond to the shape of the upper and lower case edges of the case assembly and the tube mounting hole, the welding base material does not contain a flux.

In addition, mounting the case assembly between the upper jig and the lower jig; And applying a high frequency power to a coil installed in the jig to melt the welding base material by high frequency induction heating to bond the case assembly.

In particular, it is preferable that argon gas or nitrogen gas is supplied to the case assembly surface to prevent oxidation of the case assembly surface during the high frequency induction heating.

Or, placing the case assembly in a heating furnace; And melting the welding base material by applying heat to the heating furnace to bond the case assembly.

Furthermore, it is preferable that the interior of the furnace is vacuum or filled with at least one gas selected from hydrogen, nitrogen and ammonia.

Preferably, after the welding base material is melted, the step of cooling the solidified molten welding base material by adding a cooling gas; includes.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, which can be replaced at the time of the present application It should be understood that there may be various equivalents and variations.

3 is a perspective view illustrating a case assembly before bonding during a tube bonding process for refrigerant injection of a plate heat transfer apparatus according to an exemplary embodiment of the present invention, and FIG. 4 is a cross-sectional view illustrating a portion A of a cross section taken along line BB ′ of FIG. 3. 5 is a cross-sectional view showing a portion A of the cross section taken along the line CC ′ of FIG. 3.

In the tube joining method for refrigerant injection of the plate-shaped heat transfer apparatus according to the exemplary embodiment of the present invention, as shown in FIG. 3, an upper case 110 and a lower case 120 are formed so that an accommodation space for receiving a heat transfer medium is formed therein. ). In this case, mounting holes corresponding to the shape of the refrigerant injection tube are formed on sidewalls of the upper case 110 and the lower case 120 so that the refrigerant injection tube 140 may be inserted. Here, the upper case 110 and the lower case 120 may be positioned to form a tube mounting hole, and the mounting holes corresponding to the tube shapes are formed in the upper case 110 and the lower case 120, respectively. The two cases can then be positioned, aligning these fittings.

Subsequently, in order to bond the upper case 110 and the lower case 120, a welding base material 130 to be seated along the junction of the two cases is prepared. In particular, the welding base material 130 is prepared by deforming in advance so that it can be seated in accordance with the shape of the joint and the tube mounting hole of the edge of the upper case 110 and the lower case 120. That is, the welding base material 130 is preferably a wire shape bent or pressed to correspond to the shape of the case joint and the tube mounting hole. As the material, a brazing welding base material containing no welding flux is employed. Preferably, the welding base material 130 is a silver lead alloy.

4 and 5, an example in which the shape of the welding base material 130 is modified to correspond to a mounting hole into which the refrigerant injection tube 140 is inserted is illustrated. That is, the wire-shaped welding filler 130 is spaced apart from the bottom surface of the lower case 120 to be bent in a form surrounding the upper radius of the refrigerant injection tube 140. Due to such a shape, a space into which the refrigerant injection tube 140 is inserted before / after the welding base material 130 is seated is secured. Here, the present invention is not limited to the shape bent along the semicircle, and may be modified to form a through-hole in which a tube is inserted in the center and surrounds the outer diameter of the refrigerant injection tube 140. Of course, the welding base material can be deformed in various forms via this part without interrupting the space to be inserted.

As such, when the upper case 110, the lower case 120, the deformed welding base material 130 and the refrigerant injection tube 140 are all ready, the upper and lower cases 110 and 120 are positioned and the mounting holes After inserting the refrigerant injection tube 140 into the, the modified welding base material 130 is seated in accordance with the shape of the case joint and the tube to complete the case assembly. Here, the case assembly may be completed by first placing the deformed welding base material 130 and then inserting the refrigerant injection tube 140 into the mounting hole.

When the assembly is completed, the cases 110 and 120 and the refrigerant injection tube 140 are joined to each other at once by welding.

Preferably, the case assembly is mounted between the upper jig and the lower jig of the brazing welding equipment. On the other hand, the upper jig or lower jig is embedded with a high frequency generating coil. After mounting the case assembly, brazing welding is performed while keeping the upper jig and the lower jig in close contact. That is, a high frequency current is applied to the high frequency generating coil to melt the weld base material seated by high frequency induction heating. At this time, argon gas or nitrogen gas is supplied to the case assembly surface to prevent oxidation of the case assembly surface during the high frequency induction heating.

In another embodiment of the method for joining the assembled case assembly by welding in the tube joining method for refrigerant injection of the plate heat transfer device of the present invention, the welding is performed by placing the case assembly in a heating furnace and applying heat to the heating furnace. Melt the base material.

At this time, the inside of the furnace is preferably vacuum or filled with at least one gas selected from hydrogen, nitrogen and ammonia.

Then, as shown in Figure 6, the upper and lower cases are bonded by the viscous movement of the molten welding base material 130 'and the capillary phenomenon caused at the contact interface of the upper case and the lower case. By the same principle, the refrigerant injection tube 140 is also joined to the mounting holes provided on the side walls of the upper and lower cases. Melting of the welding parent material 130 occurs substantially simultaneously along the edge junction of the case assembly and the tube mount. Thereby, line welding characteristic can be acquired. That is, the welding time is shorter than when welding the tubes separately, and a smooth and rigid welding surface can be obtained.

After the welding base material is melted and joined by brazing welding, the joining process is completed through a process of cooling and solidifying the molten weld base material by adding a cooling gas.

As described above, a procedure of bonding the plate heat transfer device according to the method of bonding the tube for refrigerant injection of the plate heat transfer device according to an embodiment of the present invention will be described with reference to FIG. 7.

7 is a flowchart illustrating a step-by-step method of bonding the tube for refrigerant injection of the plate-shaped heat transfer apparatus according to an embodiment of the present invention.

Referring to FIG. 7, first, an upper / lower case in which a mounting hole into which a refrigerant injection tube can be inserted is previously provided is prepared. Here, the upper / lower case is positioned so that the storage space for receiving the heat transfer medium is formed therein. At this time, the upper / lower case is positioned so that the mounting holes are aligned in a straight line. (1)

Next, when the welding base material is seated along the joint in a state where the upper / lower case is positioned, prepare a welding base material whose shape is deformed to correspond to the cylindrical outer diameter of the tube for refrigerant injection so that the tube mounting holes can be inserted. . This welding base material is bent or pressed along the joint in a wire shape, and the portion to be seated in the tube mounting hole is prepared to be deformed into a curved shape. (2)

The case assembly is constructed by assembling the prepared upper / lower case, the refrigerant injection tube, and the modified welded base material. At this time, the upper / lower case is first placed, and the refrigerant injection tube is inserted into the mounting hole formed in the upper / lower case, and then the welding base material is seated corresponding to the joint and the mounting hole to complete the assembly.

When the case assembly is completed, it is attached to the bonding apparatus to melt the welding base material by high frequency heating to bond the upper, lower case and the refrigerant injection tube at once. At this time, an antioxidant gas may be supplied to prevent oxidation of the case surface, and a process of solidifying the welded base metal by adding a cooling gas to cool the molten weld base material is also performed here. Through the above processes, the case of the plate-shaped heat transfer device and the tube for the refrigerant injection are completed.

The terms or words used in this specification and claims are not to be construed as limiting in their usual or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best explain their invention in the best way possible. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

According to the present invention, in the manufacture of the plate heat transfer device by treating the bonding of the case and the bonding of the refrigerant injection tube at once, the entire manufacturing process is shortened to provide the effect of saving time and cost.

In addition, when the tube is bonded by the tube joining method for refrigerant injection of the plate-shaped heat transfer device according to the present invention, the molten weld base material is sufficiently penetrated into the gap between the tube and the case by capillary force, thereby increasing the degree of completion of the joining operation and the work yield. Provides the effect to increase.

Claims (10)

(a) Opening surfaces of the upper case facing the open upper case and the lower case opening the upper case in which the inner space for accommodating the upper case are formed so as to form a storage space for receiving the heat transfer medium therein. Placing and stacking the penetrating member through the sides of the upper case and the lower case so that the refrigerant injection tube can be inserted into the upper and lower cases; (b) a shape in which the lower case and the upper case nested in the lower case are seated along a junction of a portion in contact with each other, and a shape of the welding base material deformed to correspond to the shape of the tube to be inserted in the portion where the mounting hole is formed; Preparing a; (c) inserting a refrigerant injection tube into the mounting hole and seating the prepared welding base material on the joint to form a case assembly; And and (d) bonding the upper and lower cases and the refrigerant injection tube by melting the welding base material seated on the case assembly. The method of claim 1, The step (b) is a tube joining method for the refrigerant injection of the plate-shaped heat transfer device characterized in that the shape of the welding base material is modified so as to surround the upper semicircle of the tube mounting hole. The method of claim 1, The step (b) is a tube joining method for the refrigerant injection of the plate-shaped heat transfer device characterized in that the shape of the welding base material is modified so as to form a through-hole surrounding the circle of the tube mounting hole. The method of claim 2 or 3, The welding base material is a tube joining method for the refrigerant injection of the plate-type heat transfer device, characterized in that the welding wire bent or pressed to correspond to the shape of the upper and lower case edge and the tube mounting hole of the case assembly. The method of claim 4, wherein The welding base material is a tube joining method for refrigerant injection of the plate-shaped heat transfer device, characterized in that it does not contain a flux. The method of claim 1, wherein step (d) Mounting the case assembly between an upper jig and a lower jig; And And bonding the case assembly by applying high frequency power to the coil installed in the jig to melt the welding base material by high frequency induction heating. The method of claim 6, And argon gas or nitrogen gas is supplied to the surface of the case assembly to prevent oxidation of the surface of the case assembly during the high frequency induction heating. The method of claim 1, wherein step (d) Placing the case assembly in a furnace; And And bonding the case assembly by applying heat to the heating furnace to melt the welding base material. 2. The method of claim 8, The inside of the furnace is a vacuum or tube bonding method for the refrigerant injection of the plate-type heat transfer device, characterized in that the filled with at least one gas selected from hydrogen, nitrogen and ammonia. The method of claim 1, Step (d) is, And cooling the solidified welded base material by injecting a cooling gas after the welded base material is melted. 2.

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