KR101817894B1 - Method for manufacturing heat plate of display device - Google Patents

Abstract

The present invention relates to a method for manufacturing a heat plate used for radiating heat of electronic devices such as TVs by means of a press-brazing technique. The present invention implements a new type heat plate manufacturing method comprising the processes of: press-processing clad materials, which have an excellent corrosion resistance or thermal conductivity, and forming refrigerant channels; brazing and bonding two plates; and injecting refrigerants into the refrigerant channel of the plate. The present invention provides a method for manufacturing a heat plate for electronic devices, which can manufacture products in various types, standards, and specifications because it is easy to implement a shape or change a structure and there is no limit to a product size, and can secure the quality of products in such a way of increasing radiating performances compared to an extruded molding product.

Description

[0001] METHOD FOR MANUFACTURING HEAT PLATE OF DISPLAY DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a heat plate for an electronic device, and more particularly, to a method of manufacturing a heat plate used for heat dissipation of a display device such as a TV by a press-brazing method.

In general, a display device is a device for displaying an image on a screen, such as a television, a computer monitor, a digital information display, or the like.

Such a display device includes a liquid crystal display, a field emission display, an electro luminescence, and a plasma display panel.

Usually, the display device includes a display panel, a backlight unit for inputting light to the back surface of the display panel, and the like.

Here, the backlight unit is provided with a light source for introducing light into the display panel, and a cold cathode fluorescent tube, a light emitting diode, or the like is used as a light source. The light source of the backlight unit at this time generates light as well as generates heat The display panel is deteriorated.

That is, when the heat generated by the light source is excessive due to abnormal power supply by the backlight unit in the display panel, the display panel may be damaged or damaged.

For example, a plurality of LED lamps installed in the backlight unit have consumed electric power of about 1 W per 1, and a ratio of generated heat to 1 W of consumed electric power is 70% or more.

Generally, the number of LED lamps used in a 30-inch TFT-LCD is about 200, and the heat generated here is 140 W. Such generated heat raises the temperature inside the backlight unit, And thermal stress of a component or a case due to an internal temperature difference is generated to cause deformation of the product.

Therefore, the display device is provided with a heat plate as means for appropriately discharging heat generated from the light source of the backlight unit.

As described in Korean Patent Laid-open Publication No. 10-2016-0117026, the display device including the heat plate is provided with a display panel that forms an image, a light guide plate that transmits light to the display panel, and a light guide plate that irradiates light to at least one side of the light guide plate A cooling plate disposed behind the display panel and adapted to transfer heat through the phase change of the internal refrigerant, and the like.

The heat plate, which is usually applied to a display device, has the following disadvantages because it is manufactured by an extrusion method using an extrusion die.

First, quality cost (Q-COST) such as yield reduction and supply problem is increased due to instability of extrusion quality.

Secondly, there are disadvantages of frequent breakage of extrusion mold and increase of manufacturing cost due to extrusion amount of less than 1 ton.

Third, there is a disadvantage that it can not keep up with the trend of display panels, which are getting larger and larger due to difficulty in extrusion of extensions (currently, several pieces are connected to one another).

Fourth, there is a disadvantage in that the process of fastening between the heat plate and the mounter is complicated due to excessive riveting points during assembly.

Fifth, there is a disadvantage that cost increases due to an increase in subsidiary materials in accordance with the restriction of extrusion shape.

Sixth, there are disadvantages in development diversity due to difficulty in implementing thickness and size shape.

On the other hand, following the recent method of utilizing the thermal conductivity (thermal conductivity) characteristic of the AL material itself, which is a conventional heat sink, since the display has become extremely slim, the heat resistance of the raw material itself limits the product thickness. Therefore, Plates can meet the requirements of the display market (NEEDS).

Korean Patent Publication No. 10-2016-0117026

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method for manufacturing a refrigerator, which comprises a step of forming a coolant channel by press working a clad material having excellent corrosion resistance and heat conductivity, a step of brazing two plates, By implementing a new type of heat plate manufacturing method applying a process of injecting a coolant into a channel, it is possible to manufacture products of various kinds, specifications, and specifications, such as easy to shape or change of structure, And it is an object of the present invention to provide a method for manufacturing a heat plate for an electronic device capable of securing the quality of a product such as a heat radiation performance compared to an extrusion molded article.

In order to achieve the above object, a method of manufacturing a heat plate for an electronic apparatus provided in the present invention has the following features.

A method for manufacturing a heat plate for use in a display device, the method comprising: a first step of preparing an upper plate and a lower plate to be a heat plate material; A second step of forming a plurality of side by side refrigerant channels spaced apart along the width direction of the plate material and forming a refrigerant inlet opening communicating with the refrigerant channel through the plate material end through press molding, A third step of brazing welding the adhesion portions between the plate members except for the plurality of coolant channels and the coolant injection port after the lower plate members are stacked in layers, and a third step of injecting the coolant into the coolant channel through the coolant inlet port, And a fourth step of sewing.

Here, the coolant channel formed in the second step may include a step of forming a semicircular cross section, a semi-elliptic cross section, a polygonal cross section, or the like, and both end portions in the width direction of the coolant channel may be formed into a sharp edge shape.

In addition, in the second step, a forming section that is formed along the width direction of the plate material can be formed on one side of the upper plate member during press forming, and a connection channel for communicating the lower ends of the respective refrigerant channels can be further formed. Can be molded into at least one or more.

In the first step, a clad plate is preferably applied to the upper plate and the lower plate.

As a preferred embodiment, in the second step, the coolant inlet port and the plurality of coolant channels may be set as one group, and a plurality of groups may be arranged in parallel on one upper plate.

The method of manufacturing a heat plate for an electronic device such as a display device provided in the present invention has the following effects.

First, it is possible to manufacture products of various kinds, specifications, and specifications, such as easy to shape the shape of the heat plate or change the structure, and the product size is not limited, and it is possible to greatly reduce the rivet- There is an effect that improvement can be achieved.

Second, the heat dissipation performance of the heat plate manufactured by the conventional extrusion method can be improved, and the reliability of the product can be improved and the quality of the product can be secured.

Third, since the refrigerant inlet port can be reduced to one or two when the refrigerant is injected, productivity can be improved as a whole by simplifying the process of injecting the refrigerant. In the case of applying two refrigerant inlets, It is possible to induce a high-quality vacuum.

Fourthly, by forming the forming portion in the transverse direction on the plate upper side, it is possible to secure the warp rigidity in the transverse direction, and the durability of the heat plate can be improved.

Fifth, when the channel for the coolant passage is formed, the coolant can be formed into a sharp edge shape at both ends of the channel, so that the capillary force is formed and the coolant flows smoothly.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a process diagram showing a method of manufacturing a heat plate for an electronic apparatus according to an embodiment of the present invention;
2A to 2C are front views of a heat plate manufactured by a method for manufacturing a heat plate for an electronic device according to an embodiment of the present invention
3 is a sectional view taken along the line AA in Fig. 2
4 is a sectional view taken along line BB of Fig.
5 is a front view showing a heat plate manufactured by the method for manufacturing a heat plate for an electronic apparatus according to an embodiment of the present invention and a heat plate manufactured by a conventional extrusion molding method

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

FIG. 1 is a process diagram showing a method of manufacturing a heat plate for an electronic device according to an embodiment of the present invention, and FIGS. 2A to 2C and 4 are views illustrating a method of manufacturing a heat plate for an electronic device according to an embodiment of the present invention The produced heat plate is a front view and a sectional view.

As shown in FIGS. 1 to 4, a method for manufacturing a heat plate for an electronic device, for example, a method for manufacturing a heat plate for a display device such as a TV, A refrigerant channel, a coolant injection port, and the like are formed on a sheet of sheet material by a press method, and the remaining one sheet material, that is, a substantially flat sheet material, is superimposed and joined by a brazing method. After filling the inside with a coolant, Which is a method for manufacturing a heat plate in the form of a thin plate as a whole.

To this end, in the first method of manufacturing the heat plate for a display device, the upper plate member 10 and the lower plate member 11 serving as the heat plate material are prepared.

The upper plate 10 and the lower plate 11 may be formed of a plate material made of a clad plate material, an aluminum plate material, a stainless steel plate material, or the like.

The upper plate 10 and the lower plate 11 may be formed in the shape of a rectangular plate, but it is needless to say that various plates such as a circular plate or a polygonal plate may be used.

Next, in the second step, the refrigerant channel 12 and the refrigerant inlet port (not shown) are press-molded through one of the upper plate member 10 and the lower plate member 11, for example, 13).

The coolant channel 12 serves as a passage through which the coolant flows. The coolant channel 12 is formed in the form of a long straight bead. The coolant channel 12 is formed in substantially the entire longitudinal direction of the plate material, for example, And a plurality of the coolant channels 12 may be arranged in parallel to each other along the longitudinal direction of the plate material. The plurality of coolant channels 12 may be arranged side by side at regular intervals along the width direction of the plate material .

In addition, the coolant channel 12 may have a concave cross section in the form of various grooves, for example, a semicircular cross section, a semi-elliptic cross section, or a polygonal cross section such as a square or a triangle.

At this time, in the case of the refrigerant channel 12, both end portions in the width direction of the channel cross section may have a shape of a sharp edge part 14. Accordingly, when the refrigerant flows, the capillary force in the refrigerant channel 12 The flow of the coolant can be smoothly performed.

Particularly, a connecting channel 15 is formed in the edge portion of the upper plate member 10, for example, in a plate member in the form of a rectangular plate, along the plate member width direction at the lower edge portion adjacent to the lower side. The lower ends of the respective refrigerant channels 12 formed in the upper plate 10 are connected.

Accordingly, since the respective refrigerant channels 12 and the connection channels 15 are communicated with each other, refrigerant flows not only in the channels but also between the channels, thereby ensuring a smooth evaporation and diffusion mechanism of the refrigerant The heat dissipation efficiency can be increased.

Of course, the connection channel 15 may have a semicircular cross-section, a semi-elliptic cross-section, or a polygonal cross-section while taking the shape of a long straight bead as in the case of the coolant channel 12 and also have a sharp edge portion 14 have.

The refrigerant inlet 13 is an inlet through which the refrigerant is injected when the refrigerant is filled in the refrigerant channel 12 and the connection channel 15 and is formed at an edge portion of the upper plate 10, The upper edge portion adjacent to the upper side of the plate member can communicate with the refrigerant channel 12 while communicating with the outside of the plate material.

At this time, the coolant inlet port 13 may also have a concave groove shape having a semicircular cross section, a semi-elliptic cross section, a polygonal cross section, or the like.

In particular, at least one coolant inlet port 13 may be formed, for example, two pieces of the coolant inlet port 13 may be formed at predetermined intervals in the width direction at the upper edge portion of the plate material.

Accordingly, the air inside the channel can be smoothly discharged to the outside when the coolant is injected by using the two coolant injection openings (13). As a result, it is easy to manage the coolant charge amount and also, .

In this way, the plate material is provided with the coolant injection port 13, and the efficiency of the coolant injection process can be improved with respect to the injection of the fixed amount by injecting the coolant through the coolant inlet port 13.

That is, as compared with the process of injecting the refrigerant one by one into each independent channel, by injecting the refrigerant into each channel communicated with each other by using one refrigerant inlet, not only a certain amount of refrigerant can be injected, (Width of the injection port) can be sealed. Therefore, there is an advantage that an excessive compression force is unnecessary compared to sealing each independent channel.

In addition, in the second step, the forming section 16 can be molded together at the time of press forming for forming a channel or the like.

The forming section 16 may be formed in a shape such that it is arranged in parallel with the plate material width direction on one side of the upper plate member 10, for example, a plate member in the form of a rectangular plate, at an upper edge portion adjacent to the upper side.

In the case where there are two refrigerant inlets (13), the forming section (16) has two refrigerant inlets (13) and two refrigerant inlets (13).

The forming section 16 may also have a concave groove shape having a semi-circular cross section, a semi-elliptical cross section, a polygonal cross section, or the like.

Therefore, the heat plate including the upper and lower plate members 10 and 11 can secure the flexural rigidity in the longitudinal direction (the plate member length direction) by using the plurality of coolant channels 12, Direction (plate material width direction) flexural rigidity can be ensured.

In the second step of press molding the refrigerant channel 12 and the like, the heat plate is attached to the upper panel 10 as a means for fastening a rivet or the like to the bottom chassis (not shown) or the top chassis (not shown) (Not shown), notching (not shown), and the like on the upper panel 11 and / or the lower panel 11 can be performed.

Next, in the third step, the upper plate member 10 in which the press-molded upper plate 10 is formed in the second step, that is, the upper part 10 in which the refrigerant channel 12, the coolant inlet port 13, the connecting channel 15, The plate member 10 and the lower plate member 11 are joined by a brazing welding method.

That is, the upper plate member 10 and the lower plate member 11, which are the same size, are laminated in two layers and are brazed to the close contact portions in the overlapped state.

The joining by the brazing welding at this time is performed by joining all the closely adhered portions including the edge portion between the upper plate member 10 and the lower plate member 11 such as the coolant channel 12, the connecting channel 15, the coolant inlet port 13, Except for the portion where the portion 16 is formed.

When the brazing is performed between the plate members in the third step, the interface between the upper plate member 10 and the lower plate member 11 can be filled with refrigerant, and at the same time, the refrigerant channel 12, A channel 15 may be formed and the refrigerant may be diffused as it flows.

Next, in the fourth step, the refrigerant channel 12 (including the connecting channel 15) through the refrigerant inlet 13 formed in the upper plate member 10 and the lower plate member 11 integrally joined through the third step And then the coolant injection port 13 is sealed.

After completion of the injection of the coolant, a vacuum is formed inside the channel, and the coolant injection port 13 is then sealed by brazing or the like.

Particularly, since the minimum width sealing is possible in the process of sealing the refrigerant inlet 13, that is, only one or two refrigerant inlets 13, which are relatively narrow in width compared to the single channel width, are sealed, It is possible to increase the efficiency of the sealing process, such as not requiring a pressing force.

The refrigerant injecting process and the vacuum forming process in the fourth step are the same as the refrigerant injecting process and the vacuum forming process performed on the heat plate manufactured by the conventional extrusion process, and a detailed description thereof will be omitted.

Here, the low-flammability fluid can be applied to the refrigerant as the working fluid.

When the refrigerant is installed to be in contact with a heat source for generating heat, the refrigerant in the vicinity of the heat source is heated and vaporized and then diffused into a region having a relatively low temperature .

Subsequently, the vaporized refrigerant condenses again while discharging the heat to the outside, becomes a liquid state, and performs a heat radiating function by circulating back to its original position.

The heat generated from the heat source by the circulation mechanism of the refrigerant inside the channel of the heat plate is discharged to the head portion, so that the temperature of the display device, in particular, the display panel can be maintained at a proper line.

5 is a front view showing a heat plate manufactured by a method for manufacturing a heat plate for a display device and a heat plate manufactured by a conventional extrusion molding method according to an embodiment of the present invention.

A plurality of refrigerant channels 12 and a plurality of connecting channels 15 as well as a refrigerant inlet 13 are provided in one of the upper plate 10, (I) to (IV).

For example, a plurality of refrigerant channels 12, a connection channel 15, and a coolant inlet port 13 are set as one group, and the four groups I to IV set in this manner are arranged in parallel 1 shows a heat plate 100 including a heat plate 100 of the present invention.

The heat plate 100 has a thickness of about 0.5 to 1.5 mm and a width of about 400 mm (a width of 100 mm per group) x 200 mm for a heat plate applied to a 49-inch large TV. Channel type, and the refrigerant of each channel belonging to the group I to the group IV, while having a thin thickness, exerts a heat radiating function, so that an optimal heat radiating effect suitable for a large TV can be obtained have.

In addition, the heat plate 100 may be manufactured as an eight-channel type including eight groups for a 55-inch TV, a 65-inch TV, or a twelve channel including twelve groups.

Particularly, since the heat plate 200 of the extrusion molding type in which the existing four separate article sizes 200a to 200d are assembled and fastened can be replaced by one heat plate 100 covering a large area, It is possible to greatly reduce the number of assembling processes such as the reduction of the fastening part, and thus it is advantageous in terms of assemblability and productivity, and the product competitiveness can be enhanced.

As described above, the present invention provides a new manufacturing method in which a process of forming a coolant channel or the like through press working, a process of brazing two plates, and a process of sealing a coolant channel after injecting a coolant into the coolant channel It is possible to manufacture an optimal heat plate suitable for a display device such as a large-sized TV which is easy to shape and change the structure and has no limitation on the size of a product, and also has a heat radiation performance The quality of the product can be secured.

10: Upper plate
11: Lower panel
12: Refrigerant channel
13: Refrigerant inlet
14: Sharp edge portion
15: Connection channel
16: forming section

Claims (8)

A method of manufacturing a heat plate for an electronic device,
A first step of preparing an upper plate member and a lower plate member to be a heat plate material;
A plurality of parallel refrigerant channels in the upper plate and a refrigerant inlet port connected to the refrigerant channel and communicating with the outside through a plate member end are formed through press molding, wherein the refrigerant channel is in the form of a straight bead having a concave section in the form of a groove, And are arranged in parallel to each other along the width direction of the plate material and are arranged side by side at a predetermined interval along the width direction of the plate material and are formed in the lower end edge portion of the upper plate material side by side along the plate material width direction, A plurality of refrigerant channels, a plurality of connection channels, and a plurality of coolant injection openings are set as one group, and a plurality of such groups are arranged side by side in parallel Shaped, and each of the groups belonging to each group A second step of causing the refrigerant of each of the channels to exert a heat dissipation function;
A third step of brazing the close contact portions between the plate materials excluding the plurality of coolant channels and the coolant injection port after stacking the upper plate and the lower plate in two layers;
A fourth step of injecting a coolant into the coolant channel through the coolant inlet port, forming a vacuum in the channel after the injection and sealing the coolant inlet port;
Lt; / RTI >
When the refrigerant is installed to be in contact with a heat source generating heat, the refrigerant in the vicinity of the heat source is heated and vaporized and then diffuses into a relatively low temperature region. The vaporized refrigerant again condenses while releasing heat to the outside, So that the heat generated from the heat source can be discharged to the outside by the circulation mechanism of the refrigerant formed inside the channel of the heat plate, by performing the heat radiation function through the circulation returning to the original position A method for manufacturing a heat plate.
The method according to claim 1,
And forming the refrigerant channel formed in the second step into a semicircular or semi-elliptical cross-section or a polygonal cross-section.
The method according to claim 1,
Wherein the coolant channel formed in the second step is formed into a sharp edge shape at both ends in a width direction thereof.
The method according to claim 1,
And forming a forming section along a width direction of the plate member on one side of the upper plate member during press forming in the second step.
The method according to claim 1,
Wherein the step of forming the coolant injection port comprises forming at least one coolant injection port formed in the second step.
delete The method according to any one of claims 1 to 5,
Wherein a clad plate is applied to the upper plate and the lower plate in the first step.
delete

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