KR100780144B1 - Flat plate heat spreader and method for manufacturing the same - Google Patents

Abstract

According to an aspect of the present invention, there is provided a plate heat spreader manufacturing method comprising: stacking woven meshes alternately crossing wires up and down to provide a mesh aggregate; Partially joining the meshes together to integrate them; Inserting the integrated mesh assembly into a plate-shaped case; And injecting and sealing a refrigerant into the plate-shaped case.

Further, according to the present invention is a device for transferring the heat generated from the heat source 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, evaporating while absorbing heat from the heat source and the heat release A thermally conductive plate-shaped case accommodating a refrigerant condensed while releasing heat from the unit; And a mesh assembly installed inside the case and formed by laminating alternately woven coarse meshes and dense meshes of wires alternately up and down, wherein the corner portions or the edge portions thereof have a fusion welded mesh. A heat spreader characterized by the above is disclosed.

According to the present invention it is possible to reduce the occurrence of defects by accurately placing the mesh assembly in the plate-shaped case, it is possible to manufacture a heat spreader excellent in heat transfer performance by accurately optimizing the direction of the refrigerant circulation passage.

Description

Plate heat spreader and manufacturing method thereof {FLAT PLATE HEAT SPREADER AND METHOD FOR MANUFACTURING 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 showing an example of a plate-shaped heat spreader according to the prior art.

2 is a cross-sectional view showing a plate heat spreader according to a preferred embodiment of the present invention.

3 is a plan view showing some detailed structure of a mesh employed in accordance with a preferred embodiment of the present invention.

Figure 4 is a side cross-sectional view showing a vapor diffusion passage formed in the mesh in Figure 3 in the X direction.

Figure 5 is a side cross-sectional view showing a vapor diffusion flow path formed in the mesh in Figure 3 in the Y direction.

Figure 6 is a side cross-sectional view showing a liquid film formed on the mesh in accordance with a preferred embodiment of the present invention.

7 is a perspective view showing an example of a metal fusion machine that is employed for the bonding process of the mesh aggregate.

8 is a perspective view showing an example in which the edges of the mesh aggregates are bonded together according to a preferred embodiment of the present invention.

9 is a perspective view showing an example in which a bonding process is performed before a cutting process of a mesh aggregate according to another embodiment of the present invention.

<Description of main reference numerals in the drawings>

100: plate heat spreader 110: heat source

120: heat dissipation unit 130: plate-shaped case

140,160: dense mesh 150: coarse mesh

G: mesh aggregate 200: welded portion

The present invention relates to a plate heat spreader, and more particularly, a mesh assembly for providing a vapor diffusion flow path and a liquid flow path for circulation of a refrigerant having a structure in which a mesh assembly can be accurately inserted into a plate case. A plate heat spreader and a method of manufacturing the same.

In general, various electronic devices generate a lot of heat from internal electronic components during their operation. In order to efficiently discharge such heat to the outside, a predetermined heat spreader is attached to a corresponding heat source and transferred to a heat sink such as a heat sink. It is preferable.

1 shows an example of a heat spreader 10 according to the prior art installed between a heat source 20 and a heat sink 30. The heat spreader 10 shown in the drawing has a structure in which a refrigerant is filled in the inside 40 of a thin metal enclosure 50 having a thin thickness, and a wick structure 60 is formed on an inner surface of the metal case 50. Is formed. The heat generated from the heat source 20 is transferred to the wick structure 60 inside the heat spreader 10 in contact with the heat source 20. After the refrigerant contained in the wick structure 60 is evaporated and diffused in all directions through the internal space 40 in this region, the heat is released from the wick structure 60 of the cooling region in which the heat sink 30 is installed. Condensation. The heat released in the condensation process is transferred to the heat sink 30, and is discharged to the outside in a forced convection method by the cooling fan 70.

According to the heat spreader 10 having the above structure, since the refrigerant in the liquid state absorbs heat from the heat source and evaporates, and the vaporized vapor must move back to the cooling zone, a space for the vapor flow must be secured. However, in the thin plate heat transfer device, it is not easy to secure the vapor diffusion flow path. Especially, the inside of the plate heat transfer device case is maintained in a vacuum state (decompression state), so that the case top and bottom plates are crushed or distorted during the manufacturing process. The phenomenon occurs, which lowers the reliability of the product.

Alternatively, the applicant (patent publication number: 10-2005-51530) filed by the present applicant has a plate heat transfer device that secures the flow path of the liquid refrigerant and the diffusion path of the gas phase refrigerant by installing several layers of mesh in the plate case Is disclosed. However, in the heat spreader using several layers of meshes as described above, when the meshes are not correctly inserted into the plate-shaped case, a part of the mesh may stick out of the case, resulting in a poor sealing of the case. There is a fear that the heat transfer performance may be reduced because it is not formed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described background, and an object of the present invention is to provide a plate spreader having a structure in which meshes providing a vapor diffusion passage and a liquid flow passage can be accurately inserted into a plate-shaped case, and a manufacturing method thereof.

Another object of the present invention is to provide a plate-shaped spreader and a method of manufacturing the same that can accurately optimize the circulation flow path of the refrigerant.

In order to achieve the above technical problem, a method of manufacturing a plate heat spreader according to the present invention includes: a first step of stacking woven meshes in which wires are alternately crossed up and down, and including a mesh aggregate; A second step of integrally joining the meshes partially together; Inserting the integrated mesh assembly into a plate-shaped case; And a fourth step of injecting and sealing a refrigerant into the plate-shaped case.

In the first step, the lamination treatment is preferably performed such that a coarse mesh is interposed between the two dense meshes.

In the third step, the sparse mesh provides a main and a negative direction vapor diffusion flow path in which the vapor evaporated by the refrigerant flows along the traveling direction of the wire from the intersection point and has a different cross-sectional area, but the cross-sectional area is relatively Therefore, it is preferable that a large main vapor diffusion passage is inserted into the plate-shaped case so as to be parallel to the heat transfer direction.

The first step may further include cutting the mesh aggregate to a size corresponding to an inner area of the plate-shaped case. In this case, it is preferable that the joining process of the second step is performed on the corner portion or the edge portion of the mesh assembly.

Alternatively, the joining process of the second step is performed on a mesh assembly having a relatively large area compared to the plate-shaped case, and after the joining process, cutting the mesh assembly to a size corresponding to the inner area of the plate-shaped case; May be further included. In this case, it is preferable that the joining process of the second step is performed on the corner portion or the edge portion of the region to be cut of the mesh assembly.

Preferably, the joining process of the second step may be performed by any one selected from ultrasonic welding, resistance welding and arc welding.

According to another aspect of the present invention, a device for transferring heat generated from the heat source to the heat dissipation unit in a state where one end is in contact with the heat source and the other end is in contact with the heat dissipation unit, the evaporation while absorbing heat from the heat source and A thermally conductive plate-shaped case accommodating a refrigerant condensed while releasing heat from the heat dissipation part; And a mesh assembly installed inside the case and formed by laminating alternately woven coarse meshes and dense meshes of wires alternately up and down, wherein the corner portions or the edge portions thereof have a fusion welded mesh. Characterized by a heat spreader is provided.

Preferably, the sparse mesh provides a main direction and a negative direction vapor diffusion flow path in which the vapor evaporated from the refrigerant flows along the traveling direction of the wire from the intersection point and has a different cross-sectional area, but has a relatively large cross-sectional area. A directional vapor diffusion flow path is arranged parallel to the heat transfer direction.

The mesh aggregate preferably has a structure in which a coarse mesh is interposed between two dense meshes.

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 specification and claims should not be construed as having a conventional or dictionary meaning, 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, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

2 shows a cross section of a plate heat spreader according to a preferred embodiment of the present invention. Referring to the drawings, the plate-shaped heat spreader 100 of the present invention is installed between the heat source 110 and the heat dissipation unit 120, such as a heat sink, the plate-shaped case 130 composed of an upper plate (130a) and a lower plate (130b) ), A mesh assembly G inserted into the plate-shaped case 130 and partially formed with a fusion unit 200, and a refrigerant (not shown) that serves as a medium for transferring heat in the case 130. do. In this case, the mesh assembly G has a structure in which wires alternate alternately up and down, and the woven dense meshes 140 and 160 and the coarse mesh 150 face each other up and down. The terms dense mesh (140,160) and coarse mesh 150 is named according to the relative size of the mesh lattice density, it is known in advance that the number of mesh of the dense mesh (140,160) is larger than the number of mesh of the coarse mesh (150) .

The plate case 130 is made of a metal, a conductive polymer or a thermally conductive plastic having excellent thermal conductivity so as to easily absorb heat from the heat source 110 and release heat from the heat dissipating part 120 again. More specifically, the plate case 130 may be configured in various shapes, such as square, rectangular, T-shaped. The upper plate 130a and the lower plate 130b of the plate-shaped case 130 may be manufactured using a metal, a polymer, a plastic, or the like having a thickness of preferably 0.5 mm or less, and in the case of metal, copper, stainless steel, aluminum, and the like. Molybdenum or the like can be used, and in the case of a polymer, a polymer material having excellent thermal conductivity including a thermally conductive polymer can be used, and in the case of a plastic, a plastic having excellent thermal conductivity can be employed. The case 130 cuts the above materials into a desired shape to make the upper plate 130a and the lower plate 130b, and then uses various methods such as brazing, tig welding, soldering, laser welding, electron beam welding, friction welding, and bonding. Can be bonded. Inside the bonded plate-shaped case 130 is inserted into the mesh assembly (G), the pressure is reduced to a vacuum or low pressure state and sealed in a state filled with a refrigerant, such as water, ethanol, ammonia, methanol, nitrogen or freon .

The mesh assembly G is formed by stacking wires alternately up and down and the woven dense mesh 140 and 160 and the coarse mesh 150 are stacked. The corner portion or the corner portion is ultrasonic welding, resistance welding or arc welding. As a result, a fusion unit 200 in which mesh wires of each layer are fused to each other is formed to firmly fix the meshes 140, 150, and 160. Here, the fusion unit 200 is not formed in the middle portion of the mesh assembly G, but is formed in the corner portion or the edge portion to prevent the circulation passage of the gaseous phase and the liquid refrigerant by the fusion structure.

3 is a partially enlarged plan view of the lattice of the sparse mesh 150 of the mesh provided in the mesh assembly G. Referring to FIG. Referring to the drawings, the coarse mesh 150 is woven while crossing the transverse wires 150a and 150b and the vertical wires 150c and 150d so as to alternate with each other. The coarse mesh 150 may be made of any one of metal, polymer, or plastic. Preferably, the metal is any one of copper, aluminum, stainless steel or molybdenum or alloys thereof. In addition, the sparse mesh 150 may be manufactured in various shapes according to the shape of a square, rectangular or desired plate-shaped case as described below.

Among the meshes provided in the mesh assembly G, the dense meshes 140 and 160 may be in contact with the coarse mesh 150. The dense meshes 140 and 160 are woven by the same method as the mesh wire of the same material as the coarse mesh 150 described above.

In the present invention, it is preferable that the mesh aggregate G has a structure in which three meshes are stacked as a whole by interposing a coarse mesh 150 between two dense meshes 140 and 160. However, the number of layers of the mesh is not limited to this example and may be appropriately selected in consideration of cooling capacity, thickness of electronic equipment, and the like.

In the present invention, the sparse mesh 150 serves as a means for providing a vapor diffusion flow path through which the vapor of the refrigerant evaporated by the heat source 110 can flow. More specifically, referring to FIG. 4, which shows a side cross-sectional view of a portion of the sparse mesh 150 along line AA ′ of FIG. 3, the lateral wire 150a is in contact with the bottom surface of the longitudinal wire 150c and another It is arranged in contact with the upper surface of the vertical wire 150d. Although not shown in the drawings, the other lateral wire 150b shown in FIG. 3 is the reverse. At this time, an empty space is formed in the vicinity of the upper surface and the lower surface of the lateral wire 150a, which functions as a vapor diffusion flow path Pv. The vapor diffusion flow path Pv is along the traveling direction of the vertical wires 150c and 150d from the point J where the horizontal wires 150a and the vertical wires 150c and 150d contact each other, and the cross-sectional area thereof is the contact point J. The further away from, the narrower it becomes.

Furthermore, as shown in FIG. 3, the vapor diffusion flow path Pv is formed in all directions up, down, left and right from all points J where the horizontal wires 150a and 150b and the vertical wires 150c and 150d cross each other. Therefore, the refrigerant vapor can smoothly diffuse in all directions through this flow path. In FIG. 3, the diffusion of the refrigerant vapor through the vapor diffusion flow path Pv is illustrated by an arrow ↔.

The maximum cross-sectional area of the vapor diffusion flow path Pv varies depending on the viewing direction Y of the lateral wires 150a and 150b or the viewing direction X of the vertical wires 150c and 150d. This is because the woven screen mesh is generally manufactured by weaving fabrics with the remaining wires while the horizontal wires 150a and 150b or the vertical wires 150c and 150d are fixed first, and thus the tension varies depending on the direction of the mesh.

That is, if the coarse mesh 150 shown in FIG. 3 is a screen mesh woven in the state in which the vertical wires 150c and 150d are fixed, the maximum cross-sectional area of the vapor diffusion flow path Pv is in the Y direction when viewed from the X direction. Larger than when viewed from

Specifically, the vapor diffusion flow path Pv seen in the X direction is shown in FIG. 4, and the vapor diffusion flow path Pv seen in the Y direction is shown in FIG. 5. Therefore, the sparse mesh 150 has a vapor diffusion flow rate in the X direction greater than the vapor diffusion flow rate in the Y axis direction. Hereinafter, a direction in which the vapor diffusion flow rate is large is referred to as a 'main direction' and a direction in which the vapor diffusion flow rate is relatively small is referred to as a 'negative direction'. Accordingly, permeability is better because the amount of fluid (vapor or liquid) can pass at a pressure in which the main direction is the same as the negative direction.

In view of this, in the present invention, when the mesh assembly G is disposed inside the plate-shaped case as shown in FIG. 2, the main direction of the coarse mesh 150 is a heat transfer direction, that is, the heat dissipation part 120 from the heat source 110. Match parallel to the direction of the furnace. Accordingly, the refrigerant vapor flows smoothly in the heat transfer direction, thereby optimizing heat transfer performance of the plate heat spreader 100.

On the other hand, as shown in Figure 6, during the operation of the actual plate-shaped heat spreader 100, the surface of the refrigerant in the vapor diffusion flow path (Pv) at the intersection point (J) of the horizontal wire and vertical wire of the sparse mesh 140 The liquid film 170 is formed because of the tension. Accordingly, the cross-sectional area of the actual vapor diffusion flow path Pv through which the refrigerant vapor may actually flow is reduced by the area occupied by the liquid film 170.

Although not shown in the drawings, the liquid film is formed at the intersections of the horizontal wires and the vertical wires in the dense meshes 140 and 160 as well. In addition, since the dense meshes 140 and 160 mainly provide a liquid flow path as described later in the operation of the plate heat spreader 100, the empty space of the lattice may be filled by the liquid film.

The connection of the liquid film 170 causes a horizontal flow of the refrigerant by capillary forces, as described later. Therefore, in the coarse mesh 150, the diffusion of the refrigerant evaporated mainly through the vapor diffusion flow path Pv is induced, but the horizontal flow of the liquid refrigerant may be caused by the capillary force caused by the connected liquid film 170. At this time, the average direction of the horizontal flow is the direction opposite to the heat transfer direction. And the horizontal flow amount is relatively smaller than the horizontal flow amount of the liquid refrigerant caused through the dense mesh (140,160).

Referring back to FIG. 2, the coarse mesh 150 provides a vapor diffusion flow path Pv, while the dense meshes 140 and 160 provide a liquid flow flow path. Accordingly, the refrigerant condensed in the heat dissipation unit 120 is returned to the heat source 110 near the liquid flow passage again. Specifically, in the region near the top of the heat source 110 among the regions of the dense mesh (140,160), the evaporation of the refrigerant is continuously performed during the heat transfer process. The evaporated refrigerant diffuses through the vapor diffusion flow path Pv of the loose mesh 150 to the heat dissipation part 120 maintained at a temperature lower than the evaporation temperature of the refrigerant. Then, after being condensed near the heat dissipation unit 120 directly below, it is mainly contained in the liquid film of the dense meshes 140 and 160.

However, in the dense meshes 140 and 160 near the heat source 110, evaporation of the refrigerant is caused to cause a shortage of the coolant. On the contrary, in the dense meshes 140 and 160 near the heat emitter 120, the refrigerant is condensed. Excessive phenomenon occurs. Accordingly, capillary force is generated in the connected liquid film existing in the dense meshes 140 and 160 to cause continuous flow of the liquid refrigerant in a direction opposite to the heat transfer direction. That is, the dense meshes 140 and 160 provide the liquid flow path when the refrigerant condensed in the heat dissipation part 120 is supplied to the heat source 110. In the case of the dense meshes 140 and 160, since the size of the mesh grid is small, the empty space of the mesh grid is filled with the liquid refrigerant by the surface tension of the contained refrigerant. Accordingly, the dense meshes 140 and 160 function as liquid flow passages rather than as vapor diffusion passages.

The dense meshes 140 and 160 have the same cross-sectional area of the liquid flow path due to the same reason as that of the coarse mesh 150. Therefore, the dense meshes 140 and 160 also have a 'major direction' in which the flow rate of the liquid refrigerant is large and a 'minor direction' in which the flow rate of the liquid refrigerant is relatively smaller than the main direction under the same pressure condition. In order to maximize the heat transfer performance of the plate-shaped heat spreader 100 in the present invention, it is more preferable to arrange the mesh assembly G in the plate-shaped case 130 so that the main direction of the dense meshes 140 and 160 is parallel to the heat transfer direction. In this case, the heat transfer performance of the plate-shaped heat spreader 100 is further enhanced by optimizing not only the vapor diffusion performance of the coarse mesh 150 but also the liquid flow performance of the dense meshes 140 and 160.

In the present invention, the mesh assembly (G) is interposed between the upper plate (130a) and the lower plate (130b) to support them so that the phenomenon of the case is not crushed during vacuum operation or handling of the device for the refrigerant filling.

Then, the operation of the plate-shaped heat spreader 100 according to an embodiment of the present invention will be described with reference to FIG.

As shown, one end of the lower plate 130b of the plate heat spreader 100 according to the present invention is in contact with the heat source 110, and one end of the upper plate 130a is a heat dissipation unit 120 such as a heat sink or a cooling fan. Contact with. In particular, in the plate-shaped case 130 forming the body of the plate-shaped heat spreader 100, a mesh assembly G provided with a fusion unit 200 at a corner portion or an edge thereof is disposed so that the meshes 140, 150, and 160 are fixed to each other at an accurate position. State is maintained. In this state, the heat transfer operation is started when the temperature of the heat source 110 rises above the evaporation temperature of the refrigerant.

Specifically, heat generated from the heat source 110 is transferred to the dense meshes 140 and 160 through the lower plate 130b of the plate-shaped case 130. Then, the refrigerant contained in the dense meshes 140 and 160 is heated and evaporated, and the vaporized vapor is diffused in all directions from the inside of the cooling apparatus through the vapor diffusion passage of the coarse mesh 150. However, on the average, the evaporated refrigerant diffuses toward the heat dissipation part 120. At this time, since the main direction of the sparse mesh 150 coincides with the heat transfer direction, that is, the direction from the heat source 110 to the heat dissipation part 120, the diffusion of the evaporated refrigerant is optimized.

The diffused vapor is condensed in the dense meshes 140 and 160 and the sparse mesh 150 which are substantially below the condensation temperature of the refrigerant, substantially below the heat dissipation unit 120. The condensation heat generated in the condensation process is transferred to the case upper plate 130a and then released to the outside by conduction heat transfer, natural convection, or forced convection by, for example, a cooling fan.

The condensed liquid refrigerant is contained in the dense mesh 140 and 160 and the coarse mesh 150 and then near the heat source 110 by capillary forces caused by the connected liquid film due to continuous evaporation of the refrigerant near the heat source 110. Flow to and return. At this time, the flow of the refrigerant liquid is mainly through the dense mesh (140,160). The condensed refrigerant contained in the coarse mesh 150 may flow in the horizontal direction, but vertically flows through the intersection point J of the coarse mesh 150 and mainly flows into the dense mesh 140 and 160. Ideally, the circulation of this refrigerant continues until the temperature of the heat source is substantially equal to or below the evaporation temperature of the refrigerant.

In a preferred embodiment, since the main direction of the dense mesh (140,160) is parallel to the heat transfer direction like the coarse mesh (150), the flow of the refrigerant liquid is also optimized so that the condensed refrigerant is smoothly supplied near the heat source (110) . Here, the dense meshes 140 and 160 may be formed of an optimized liquid flow path by capillary forces caused by the evaporation part directly above the heat source 110, the condensation part directly below the heat dissipation part 120, and the connected liquid film. Play the role.

In addition, the coarse mesh 150 serves as an optimized vapor diffusion passage, and a condensation unit directly below the heat release unit 120 and a dense liquid liquid condensed directly below the heat release unit 120. It serves as a return path that allows the vertical flow back to the mesh (140,160). In particular, since the coarse mesh 150 serves as a vapor diffusion passage, it is not necessary to form an empty space inside the plate-shaped case 130 to secure a separate vapor diffusion passage.

Hereinafter, the manufacturing method of the plate-shaped heat spreader 100 according to a preferred embodiment of the present invention will be described.

First, a process of providing a mesh aggregate G by overlapping a relatively dense mesh and a coarse mesh up and down is performed, wherein the mesh aggregate G is formed between two layers of the dense mesh 140 and 160. It is preferable to be laminated | stacked so that it may interpose.

Subsequently, a process of joining edges or edges of the mesh assembly G to each other to fix the meshes 140, 150, and 160 is performed. Here, as a method of joining the meshes 140, 150, and 160, a fusion method through ultrasonic welding, resistance welding, or arc welding may be used.

For example, FIG. 7 schematically shows an ultrasonic metal fusion machine 180 for fusion welding the mesh assembly G. As shown in FIG. As shown in the figure, when the ultrasonic oscillator is operated while the mesh assembly G is disposed between the vibration terminal portion 181 of the ultrasonic metal welding machine 180 and the metal table 182, the vibration terminal portion 181 is mechanically operated. As a result, vibration heat is generated at the joint surface of the mesh assembly G and the vibration terminal 181, and the wires of the dense meshes 140 and 160 and the coarse mesh 150 are fused to each other. In the present invention, the mesh aggregate (G) provides a wick structure and a circulation flow path of the gaseous and liquid refrigerants, so that only the edges or the edges thereof are fused to prevent performance degradation.

The resistance welding is a method of flowing a large current through the joining point of the mesh assembly (G) to induce heat generation due to the contact resistance of the joining portion to make it melted, and apply welding by applying a mechanical pressure, and the conventional butt welding, spot welding, Deep welding and the like can be employed.

In the arc welding, the mesh assembly G is disposed between two electrodes, and a high voltage is provided to generate an arc between the two electrodes to fuse the joining point with a heat of 3000 ° C. or higher.

In the present invention, the mesh assembly G is cut into a size corresponding to the inner area of the plate-shaped case 130 and then inserted into the plate-shaped case 130. Here, the cutting process of the mesh aggregate G may be performed in a state in which the meshes are laminated before the bonding process between the meshes 140, 150, and 160, or before lamination. Bonding treatment after cutting is performed with respect to the edge of the mesh assembly G as shown in FIG. 8.

Alternatively, the cutting process of the mesh aggregate may be performed after the joining process between the meshes 140, 150, and 160. In this case, the mesh aggregate G 'is provided by stacking large size meshes as shown in FIG. 9, and the joining process is performed on the corner portion of the region to be cut (see dotted line) of the mesh aggregate G'. do. Here, the region to be cut is divided into dimensions corresponding to the inner area of the plate-shaped case 130.

Finally, the mesh assembly bonded as described above is inserted into the plate-shaped case, and the plate-shaped heat spreader is completed by sealing after injecting the refrigerant.

According to the present invention, the dense meshes 140 and 160 and the coarse mesh 150 constituting the mesh aggregate G are not separately inserted into the plate-shaped case 130, but are plate-shaped case 130 in an integrated state by welding or the like. Is inserted into the. Therefore, problems such as misalignment between the meshes caused when the plurality of meshes 140, 150, and 160 are individually inserted into the case and a decrease in the cooling efficiency thereof can be prevented and production efficiency can be improved.

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims.

As described above, the plate-shaped heat spreader according to the present invention and its manufacturing method provide the following effects.

First, it is possible to prevent the poor sealing of the plate-shaped case or the deterioration of the heat transfer performance by placing the mesh in the correct position inside the plate-shaped case in a state where the several layers of meshes are bonded to each other.

Second, through the mesh aggregate structure in which the meshes are bonded to each other, the circulation flow path of the refrigerant can be formed precisely parallel to the heat transfer direction, and the circulation flow path can be stably maintained.

Third, since a plurality of meshes can be inserted into the plate-like case collectively, the work efficiency can be improved.

Claims (11)

In the manufacturing method of the plate-type heat spreader which transfers the heat | fever which generate | occur | produced from the said heat source to a heat dissipation part with the one end contacting a heat source, and the other end contacting a heat dissipation part, A first step of laminating meshes woven by alternately crossing wires up and down to provide a mesh aggregate; A second step of integrating and integrating meshes of a corner portion or an edge portion to each other in the mesh assembly; Inserting the integrated mesh assembly into a plate-shaped case; And And a fourth step of injecting and sealing a refrigerant into the plate-shaped case. The method of claim 1, wherein in the first step, And the lamination treatment is performed such that a coarse mesh is interposed between two layers of the dense mesh. The method of claim 2, wherein in the third step, The sparse mesh provides a main and negative steam diffusion flow path having a different cross-sectional area and a vapor in which the refrigerant has evaporated along the traveling direction of the wire from the intersection point, and has a relatively large cross-sectional area. And a diffusion channel is inserted into the plate-shaped case so as to be parallel to the heat transfer direction. The method of claim 1, wherein in the first step, And cutting the mesh aggregate to a size corresponding to an inner area of the plate-shaped case. delete In the manufacturing method of the plate-type heat spreader which transfers the heat | fever which generate | occur | produced from the said heat source to a heat dissipation part with the one end contacting a heat source, and the other end contacting a heat dissipation part, A first step of forming a mesh assembly by laminating alternately up and down wires and weaving them, and stacking relatively large meshes compared to the plate-shaped case; In the mesh assembly, a second step of integrating the mesh of the corner portion or the edge portion of the region to be cut and bonded to each other, and cutting the integrated mesh assembly to a size corresponding to the inner area of the plate-shaped case; Inserting the cut mesh assembly into a plate-shaped case; And And a fourth step of injecting and sealing a refrigerant into the plate-shaped case. delete The method according to any one of claims 1, 2, 3, 4 or 6, The joining process of the second step is a heat spreader manufacturing method, characterized in that performed by any one selected from ultrasonic welding, resistance welding and arc welding. An apparatus for transferring heat generated from a heat source to a heat dissipation unit with one end in contact with a heat source and the other end contacting the heat dissipation unit A thermally conductive plate-shaped case in which a refrigerant is evaporated while absorbing heat from the heat source and condensed while releasing heat from the heat radiating unit; And It is installed inside the case, the wires are alternately formed up and down alternately woven coarse mesh and dense mesh is formed by lamination, the corner portion or the edge portion of the mesh assembly having a fusion welded to each other mesh; Heat spreader to make. The method of claim 9, The sparse mesh provides a main and negative vapor diffusion flow path in which the vapor evaporated by the refrigerant flows along the traveling direction of the wire from the intersection point and has a different cross-sectional area, but has a relatively large cross-sectional vapor diffusion path. A plate heat spreader, wherein the flow path is parallel to the heat transfer direction. The method of claim 9 or 10, The mesh aggregate has a structure in which a coarse mesh is interposed between two layers of the dense mesh.

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