KR20080095644A - Method for manufacturing of flat plate heat spreader and apparatus manufactured using the same - Google Patents

Abstract

A method for manufacturing of flat plate heat spreader and apparatus manufactured using the same is provided to emit heat from heat source by circulating refrigerant through evaporation or condensation of refrigerant. A flat plate heat spreader, one end of which is in contact with a heat source, delivers heat from it into a heat spreading unit horizontally. A method for manufacturing of flat plate heat spreader comprises a step of extruding a flat plate spreader at specific length in order to form grooves formed into a flat pipe shape having a space inside along the longitudinal direction; a step of sealing openings(132,134) of one among sides opened on both ends of the extruded case; and a step of injecting refrigerant into opening of the other side of enclosed sides of the case and then sealing it.

Description

Method for manufacturing of flat plate heat spreader and apparatus manufactured using the same

The following drawings attached to this specification are illustrative of preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.

1 is a cross-sectional view of a plate heat transfer apparatus manufactured by a conventional method.

Figure 2 is an illustration of a conventional case bonding process using a TIG welding method or a laser welding method.

3 is an illustration of another conventional case bonding process using the soldering method.

Figure 4 is a perspective view showing a case of the plate-shaped heat transfer apparatus according to an embodiment of the present invention.

5A to 5C show a groove cross section of a rectangular shape, FIG. 5B shows a groove cross section of a triangular shape, and FIG. 5C shows a groove cross section of a trapezoidal shape.

5A to 5C are diagrams showing examples of the groove cross-sectional shape shown in FIG. 4.

6 is a cross-sectional view of a plate heat transfer apparatus according to another embodiment of the present invention.

7 and 8 are perspective views showing a case of the plate-shaped heat transfer apparatus according to another embodiment of the present invention.

9 is a flowchart illustrating a method of manufacturing a plate heat transfer apparatus according to an embodiment of the present invention.

<Description of Major Reference Marks in Drawing>

100: case 110,120: groove

115: screen mesh 132,134: opening

The present invention relates to a plate heat transfer apparatus capable of releasing heat from a heat source through circulation of a refrigerant through vaporization and condensation of a refrigerant, and more particularly, to a method of simplifying a case manufacturing process of a plate heat transfer apparatus and a method thereof. The present invention relates to a plate heat transfer device manufactured by the method.

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 function enhancement of electronic equipment is increasing, and 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 is a cross-sectional view of a plate heat transfer apparatus manufactured by a conventional method.

Looking at the plate heat transfer device (1) manufactured by the conventional method with reference to the drawings, the conventional plate heat transfer device (1) is the upper case (2) and the lower case (3) inside the steam flow path (5) as a screen mesh And wick structure (4) is arranged and joined. The joint surface 6 of the upper case 2 and the lower case 3 is joined using various welding methods. The plate heat transfer device 1 absorbs heat generated from the heat source 7 to evaporate the refrigerant, and the evaporated refrigerant moves through the vapor passage 5. The migrated vapor diffuses in all directions in the wick structure 4, and the steam discharges heat as it condenses, and the released heat is discharged to the outside through the upper case 2 by conduction or convection.

However, such a conventional plate heat transfer device 1 has to be manufactured by joining the upper and lower cases 2 and 3 separately, and the joining technique is very difficult and the yield is not very good even when joining using the joining technique. .

Figure 2 is an illustration of a conventional case bonding process using a TIG welding method or a laser welding method.

According to the bonding process shown, first, the case assembly 30 is fixed between the upper jig 10 and the lower jig 20. Then, the upper case 30a and the lower case 30b are applied by applying a pulse current to the TIG welding rod or the laser welding rod 60 while pressing the jigs 10 and 20 with the upper and lower press cylinders 40 and 50. Weld the boundary that is in contact.

However, the above welding method is a spot welding method using the instantaneous pulse current, there is a problem that the welding surface is not continuous and not suitable for case welding of a complicated shape. In addition, due to the occurrence of fine leaks, it is difficult to completely bond the upper case 30a and the lower case 30b and there is a limit in that the process time is long.

3 is an illustration of another conventional case bonding process using the soldering method.

According to the illustrated bonding process, the soldering material 70 is inserted between the contact surfaces of each case when the upper case 30a and the lower case 30b are assembled. Then, the press assembly 40, 50 is used to fix the case assembly 30 between the upper jig 10 and the lower jig 20 and heat the edge of the case assembly 30. Then, the upper case 30a and the lower case 30b are bonded while the soldering material is melted.

By the way, the above joining method has the advantage that the welding surface is smooth and the processing time is fast due to the characteristics of the line welding, regardless of the shape of the case, but impurities such as flux contained in the soldering material penetrate into the inside of the case. There is a disadvantage of degrading the performance.

The present invention has been made to overcome the above-mentioned problems of the prior art, the method of manufacturing a plate heat transfer apparatus that can solve the problems occurring during the case bonding process by improving the plate heat transfer apparatus manufacturing process and produced by the method The object is to provide a plate heat transfer apparatus.

In addition, it is possible to reduce the manufacturing time and cost by simplifying the manufacturing process of the plate-shaped heat transfer device, and the manufactured plate heat transfer device is another object to provide a manufacturing method that can simplify the structure.

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 manufacturing method of the plate-shaped heat transfer apparatus according to the present invention for achieving the above object, the heat generated in the heat source in the horizontal direction in the state where one end is in contact with the heat source and the other end is in contact with the heat dissipation unit. A method of manufacturing a plate-shaped heat transfer apparatus for transmitting, comprising the steps of: (a) extruding a plate-shaped case by a predetermined length such that a plurality of groove structures are formed in a longitudinal direction on an inner surface in the form of a plate-shaped pipe having a space formed therein; (b) sealing an opening at one side of the surfaces opened at both ends of the extruded case; And (c) injecting a refrigerant into the opening of the other side of the sealing surface of the case and sealing the opening.

The groove structure formed on the inner surface of the case may have different sizes of grooves formed on the upper surface and grooves formed on the lower surface.

In addition, the groove structure formed on the inner surface of the case is preferably extruded so that the shape of the groove cross section is a polygonal shape or a circular shape, and the polygonal shape is preferably any one of a triangle, a square, a pentagon, and a trapezoid.

In addition, the plate-shaped case to be extruded in the step (a) is made of a thermally conductive material, it is preferable to extrude so that the outer surface of the case has a flat plane.

Further, the opening is preferably sealed through mechanical pressing or welding of cold welding and mechanical sealing.

In particular, in the step (c), it is preferable that the refrigerant is injected and sealed while the inside of the case is kept in a vacuum.

Preferably, before the step (c), the step of inserting the screen mesh to be in close contact with the inner bottom surface through the opening of the case; further includes.

According to another aspect of the present invention, a method of manufacturing a plate-type heat transfer device for transmitting heat generated in the heat source in the horizontal direction in the state where one end is in contact with the heat source and the other end is in contact with the heat dissipation unit, (a Extruding the cylindrical case by a predetermined length such that a plurality of groove structures formed along the longitudinal direction are formed in the inner surface in the form of a cylindrical pipe having a space formed therein; (b) pressing the extruded cylindrical case in a radial direction to press the plate into a plate shape; (c) sealing an opening at one side of the surfaces opened at both ends of the crimped case; And (d) injecting a refrigerant into the opening of the other side of the sealing surface and sealing the opening.

The groove structure formed on the inner surface of the cylindrical case may have different sizes of grooves formed on the upper semi-circular surface and grooves formed on the lower semi-circular surface.

In addition, the step (b), it is preferable to compress the outer surface of the upper / lower end of the crimped case to have a flat plane.

In particular, in the step (d), it is preferable that the refrigerant is injected and sealed while the inside of the case is kept in a vacuum.

Furthermore, the method may further include inserting a screen mesh to be in close contact with the bottom surface of the inside through the opening of the case.

According to another aspect of the present invention, there is provided a plate heat transfer apparatus manufactured by the above method.

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.

Figure 4 is a perspective view showing a case of the plate-shaped heat transfer apparatus according to an embodiment of the present invention.

Referring to FIG. 4, the plate heat transfer apparatus according to the present invention manufactures a case 100 in the form of a plate-shaped pipe having a space formed therein through extrusion, injects a refrigerant therein, and then opens both openings 132 and 134. By sealing it. Here, grooves 110 and 120 are formed on the inner surface of the case 100.

The case 100 is made of a thermally conductive metal material and extruded through an extrusion process to form a shape. Extrusion is a process in which soft metal materials such as aluminum and magnesium are pressurized to flow out through the die orifice at high pressure, and reduced by drawing cross-sections with round bars, angle bars, pipes, irregularly shaped rods, and other products. . Extrusion is not only hot but also cold depending on the metal, and the processing speed is relatively fast and the productivity is good.

The extruded case 100 is shaped like a plate having a predetermined area. In addition, a space is formed in the inner surface of the plate shape and a pipe shape in which both sides are opened by extrusion. The outer surface of the extruded case 100 has a flat plane, the inner surface has a structure in which a plurality of grooves (groove) is formed. The grooves 110 and 120 are formed in the shape of grooves that are elongated along the length of the pipe shape and are formed around the inner surface. In particular, the grooves 110 and 120 may be formed in different sizes on the upper and lower surfaces of the inner surface of the case 100. The groove 110 formed on the lower surface serves as a refrigerant flow path in a liquid state, and the groove 120 formed on the upper surface serves as a refrigerant flow path in a vapor state. In addition, the cross-sectional shape of the grooves 110 and 120 may be formed in a polygonal shape or a circular shape, and examples of the groove cross-sectional shape are illustrated in FIGS. 5A to 5C. FIG. 5A shows a cross-sectional groove cross section, FIG. 5B shows a triangular groove cross section, and FIG. 5C shows a trapezoidal groove cross section. The present invention is not limited to the groove cross-sectional shape shown in the drawings, the groove may be formed in a variety of shapes, such as pentagonal, hexagonal, fan-shaped.

Both sides of the case 100 are open, and after the refrigerant is injected into the case 100, the plate-type heat transfer device is completed by sealing both the opening 132 on one side and the opening 134 on the other side. When the refrigerant is injected into the case 100, the refrigerant is injected while the inside of the case 100 is maintained in a vacuum. To this end, first, the opening 132 of one side is sealed, and then a negative pressure is applied to the opening 134 of the other side to make the interior vacuum and inject the refrigerant. When the refrigerant injection is completed, the other opening 134 is sealed to maintain the vacuum state. When applying negative pressure, a vacuum pump is used, and the opening is sealed by mechanical crimping or welding. Examples of such sealing methods include cold welding, mechanical sealing, and the like.

As described above, the plate heat transfer device of the present invention manufactured by injecting a refrigerant into the case 100 and sealing the openings on both sides thereof, has one end in contact with an external heat source and the other end in contact with a heat dissipation unit. It serves to transfer the heat generated in the heat dissipation unit in the horizontal direction. That is, when heat is transferred from one end in contact with the external heat source, the refrigerant in the liquid flow path, which is the groove 110 formed on the lower surface side, evaporates and diffuses through the vapor flow path, which is the groove 120 formed on the upper side surface. The diffused refrigerant vapor is condensed in the absence of a heat source or in a condenser having a heat dissipation device. The condensed refrigerant returns back to the heat source by the capillary force of the liquid flow path. Through this process, the heat generated from the heat source is transferred to the outside.

In another embodiment, when the groove 110, which serves as a liquid flow path at the lower surface of the case 100, is too small to be molded properly during extrusion, grooves are formed on the lower surface as shown in FIG. Instead, the screen mesh 115 is inserted after the case 100 is extruded to replace the liquid flow path. The screen mesh 115 is inserted through the opening of the case 100 and is installed to be in close contact with the bottom surface of the inside. The screen mesh 115 is manufactured by weaving a wire of metal or nonmetal material.

7 and 8 are perspective views showing a case of the plate-shaped heat transfer apparatus according to another embodiment of the present invention.

Referring to the drawings, the plate-shaped heat transfer apparatus according to another embodiment of the present invention, by extruding the case 101 in the form of a cylindrical pipe so as to form a space therein, by pressing to form a plate shape, molded into a plate shape The case 102 is made by injecting a refrigerant into the inside and then sealing both openings. Here, grooves 112 and 122 are formed on the inner surface of the extruded casing 101.

As shown in FIG. 7, the extruded case 101 is made of a thermally conductive metal material and extruded through an extrusion process to form a shape. The extruded case 101 has a cylindrical shape having a predetermined outer diameter. In addition, a space is formed in the inner surface of the cylindrical shape, and a pipe shape in which both sides are opened by extrusion. The inner surface of the extruded case 101 has a structure in which a plurality of grooves are formed. The grooves 112 and 122 are formed in the shape of grooves extending in the longitudinal direction of the pipe shape, and a plurality of grooves 112 and 122 are formed around the inner surface. In particular, the grooves 112 and 122 may be formed in different sizes on the upper semicircle and the lower semicircle of the inner surface of the case 101. In addition, the grooves 112 and 122 have a polygonal or circular shape in cross section.

The cylindrical case 101 extruded as described above is pressed in the A-A 'direction and shaped into a plate shape as shown in FIG. 8. The case 102 formed into a plate shape after pressing has a flat top surface and a bottom outer surface. In addition, the groove 122 formed on the upper surface serves as a steam flow path, and the groove 112 formed on the lower surface serves as a liquid flow path. Here, when pressing a cylindrical shape into a plate shape by pressing, it is made to compress so that the space inside it may be maintained. In other words, excessive compression is required so that the inner surfaces are in close contact with each other so that the space is not short.

The plate-shaped case 102 pressed and molded as shown in FIG. 8 is completed in the plate-shaped heat transfer apparatus through the same procedure as the plate-shaped case 100 of the plate-shaped heat transfer apparatus according to the embodiment described above with reference to FIG. 4. Therefore, detailed description is the same as described above will be omitted.

Hereinafter, a method of manufacturing a plate heat transfer apparatus according to an embodiment of the present invention will be described in order according to a manufacturing process.

9 is a flowchart illustrating a method of manufacturing a plate heat transfer apparatus according to an embodiment of the present invention.

Referring to FIG. 9, first, a cylindrical case having a groove formed on an inner surface thereof is extruded. A groove is then formed on the inner surface, and the outer surface is extruded using corresponding extrusion dies to maintain the curved surface.

The cylindrical case thus extruded is pressed in the up / down direction to apply pressure. As a result of pressing, the cylindrical case is formed into a plate-shaped case. This molding causes the plate-shaped outer upper and lower surfaces to have a flat plane. In addition, the grooves formed on the inner surface have the form of a liquid flow path and a vapor flow path. (2)

Next, the case molded into a plate shape seals the opening on one side of the openings on both open sides. Sealing proceeds through compression or welding. (3)

In the case in which the opening of one side is sealed, refrigerant is injected into the opening of the other side. During refrigerant injection, the inside of the case is kept in a vacuum state. (4)

After the refrigerant is injected into the inside, the opening surface on the other side is opened. At this time, the sealing is performed while maintaining the vacuum so that the material is not inserted from the outside. In this manner, the plate heat transfer apparatus of the present invention is manufactured.

The terms or words used in this specification and claims are not to be construed as being limited to their usual or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best describe their invention. 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, it is possible to avoid the process of preparing and bonding the upper and lower cases in the manufacture of the plate-type heat transfer device, to save the time required for the case bonding, and also to reduce the cost of the additional process Provide effect.

In addition, the manufacturing method of the plate-type heat transfer device according to the present invention is a simple manufacturing process is significantly reduced the defect rate compared to the existing method, the device is also manufactured according to the simple structure, there is an effect that can reduce the weight and material costs. .

Claims (18)

A method of manufacturing a plate heat transfer apparatus for transferring heat generated in a heat source in a horizontal direction with one end in contact with a heat source and the other end in contact with a heat radiator, (a) extruding the plate-shaped case by a predetermined length to form a plurality of groove structures formed along the longitudinal direction in the inner surface in the form of a plate-shaped pipe having a space therein; (b) sealing an opening at one side of the surfaces opened at both ends of the extruded case; And (c) injecting a refrigerant into the opening of the other side of the sealing surface of the case and sealing the opening. The method of claim 1, wherein step (a) comprises: The groove structure formed on the inner surface of the case is extruded so that the size of the grooves formed on the upper surface and the grooves formed on the lower surface are different from each other. The method of claim 1, wherein step (a) comprises: The groove structure formed on the inner surface of the case is extruded so that the shape of the groove cross-section is a polygonal shape or a circular shape, the manufacturing method of the plate-shaped heat transfer device. The method of claim 3, wherein The polygonal shape is a triangular, rectangular, pentagonal, trapezoidal any one of the manufacturing method of the plate-shaped heat transfer device. The method of claim 1, The plate-shaped case extruded in the step (a) is a method of manufacturing a plate-type heat transfer device, characterized in that made of a thermally conductive material. The method of claim 1, The step (a), the method for producing a plate-type heat transfer device, characterized in that the extrusion to have a flat plane the outer surface of the case. The method of claim 1, The opening is sealed by mechanical welding or welding of cold welding (Mechanical Welding) and Mechanical Sealing (Mechanical Sealing) characterized in that the manufacturing method of the plate-type heat transfer device. The method of claim 1, The step (c) is a manufacturing method of the plate-type heat transfer device, characterized in that the refrigerant is injected and sealed while the inside of the case is maintained in a vacuum. The method of claim 1, Before step (c) above, Inserting a screen mesh to be in close contact with the bottom surface of the inside through the opening of the case; Method of manufacturing a plate-type heat transfer device further comprising. A method of manufacturing a plate heat transfer apparatus for transferring heat generated in a heat source in a horizontal direction with one end in contact with a heat source and the other end in contact with a heat radiator, (a) extruding a cylindrical case by a predetermined length such that a plurality of groove structures are formed in a longitudinal direction on an inner surface thereof in the form of a cylindrical pipe having a space formed therein; (b) pressing the extruded cylindrical case in a radial direction to press the plate into a plate shape; (c) sealing an opening at one side of the surfaces opened at both ends of the crimped case; And (d) injecting a refrigerant into the opening of the other side of the sealing surface of the case and sealing the opening. The method of claim 10, wherein step (a) comprises: The groove structure formed on the inner surface of the cylindrical case is extruded so that the size of the grooves formed on the upper semi-circular surface and the grooves formed on the lower semi-circular surface are different from each other. The method of claim 10, wherein step (a) comprises: The groove structure formed on the inner surface of the cylindrical case is extruded so that the shape of the groove cross section is a polygonal shape or a circular shape, the method of manufacturing a plate-type heat transfer device. The method of claim 10, The cylindrical case to be extruded in the step (a) is a manufacturing method of the plate-type heat transfer device, characterized in that made of a thermally conductive material. The method of claim 10, The step (b), the method of manufacturing a plate-type heat transfer device, characterized in that the pressing so that the outer surface of the top / bottom of the crimped case has a flat plane. The method of claim 10, The opening is sealed by mechanical welding or welding of cold welding (Mechanical Welding) and Mechanical Sealing (Mechanical Sealing) characterized in that the manufacturing method of the plate-type heat transfer device. The method of claim 10, The step (d) is a manufacturing method of the plate-type heat transfer device, characterized in that the refrigerant is injected and sealed while the inside of the case is maintained in a vacuum. The method of claim 10, Prior to step (d), Inserting a screen mesh to be in close contact with the bottom surface of the inside through the opening of the case; Method of manufacturing a plate-type heat transfer device further comprising. 18. A plate heat transfer apparatus manufactured by the method according to any one of claims 1 to 17.

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