TWI476359B - With a compound of the flat capillary tissue forming structure and the heat pipe manufacturing method - Google Patents

Description

Flat heat pipe structure with composite capillary structure and molding method thereof

The invention relates to a flat heat pipe, in particular to a flat heat pipe structure with composite capillary structure and an innovative design method of the molding method.

According to the design of the heat pipe structure, in order to achieve the better effect of the condensate return conveying, a capillary structure is usually added inside the heat pipe to achieve the purpose.

Conventional heat pipes usually achieve the purpose of assisting condensate recirculation through a single capillary structure, and subsequent related companies have further developed a composite capillary structure to cope with the effect of improving the diversion effect.

Although the composite capillary structure design can obtain better condensate drainage effect, the process is relatively difficult and problematic, especially when applied to the flat heat pipe structure, the difficulty and problems will be more prominent. Significantly; Gain, flat heat pipe is usually formed by flattening of a circular pipe. Due to the deformation process in the process, the capillary structure in the pipe is often in any form such as a mesh body or a sintered body. It is easy to produce 瑕疵 error phenomena such as deformation, deviation, looseness, etc. in the process of round pipe flattening and vacuum sealing, which leads to serious problems such as high process defect rate and difficult quality control of the finished product; Capillary structure, because it involves further technical projects such as alignment accuracy and stability between the two types of capillary structures, it is conceivable that the problems to be solved must be more complicated and difficult, and this is the current flat Although the composite capillary structure design has been seen in the heat pipe, in fact, it is still difficult to implement the concrete manufacturing process or the defect rate is high. Industry utilization and efficiency of the points.

Furthermore, since the height space inside the flat heat pipe is greatly reduced compared with the round pipe, the steam flow guiding space is relatively reduced. Therefore, when it is introduced into the composite capillary structure, it has a certain volume thickness distributed in the heat pipe, which will cause steam. The problem of the diversion space is further reduced, which in turn affects the heat transfer efficiency of the flat heat pipe. This part is also a subject that must be considered.

Therefore, in view of the problems existing in the above-mentioned conventional flat heat pipes, how to develop an innovative structure that can be more ideal and practical, and the relevant industry should further consider the goals and directions of breakthrough.

In view of this, the inventor has been engaged in the manufacturing development and design experience of related products for many years. After detailed design and careful evaluation, the inventor has finally obtained the practical invention.

The main object of the present invention is to provide a flat heat pipe structure with composite capillary structure and a molding method thereof, and the problem to be solved is to develop a new flat heat pipe structure and a molding method which are more ideal and practical. In order to solve the problem, the technical features of the present invention include: a flat tubular body, a hollow tubular body shape that is closed in a flat shape, including a top wall, a bottom wall, and two a side wall and a hollow chamber, and the flat tube body comprises a heated end and a condensing end, the two ends of the flat tube body are closed, and the hollow chamber is evacuated, and the hollow chamber is And the filling body is provided with a working fluid; the long braided mesh body is disposed in one of the top and bottom walls of the hollow chamber, and the length of the long braided mesh body is set by the flat tubular body. The heated end extends to the condensation end; the elongated porous sintered body is positioned to The position of the cavity in the hollow tube is at least one of the side walls, and the length of the elongated porous sintered body is extended from the heated end of the flat tube to the condensation end, and the porous sintered body is braided with the elongated shape The mesh system is pre-bonded and fixed into a composite capillary structure, and the porous sintered system is bonded to the elongated woven mesh body on one side and to the bottom wall or the top wall of the hollow tubular body in the flat tubular body on the opposite side. State.

The method of the invention comprises: preparing a round pipe and a composite capillary structure, wherein the composite capillary structure is composed of a surface of a long braided mesh body and a fixed elongated porous sintered body; the composite capillary structure prepared in advance is compounded Inserting into the round pipe; then applying a flattening method to the round pipe which has been placed into the composite capillary structure, thereby transforming the round pipe into a flat pipe, and at the same time, the composite capillary structure is positioned in the flat pipe space, and Relying on the inner plane of the flat tube; the flat tube is filled with a working fluid and a vacuum sealing means.

With this innovative and unique design, the present invention can make the flat heat pipe with composite capillary structure achieve better drainage effect, better stable positioning, better steam guiding space and simple process. It is indeed possible to implement a number of practical advancements.

Please refer to the figures 1, 2, 3 and 4, which are preferred embodiments of the flat heat pipe structure with composite capillary structure of the present invention and a molding method thereof, but the embodiments are for illustrative purposes only, and are on the patent application. It is not limited by this structure; the flat heat pipe A includes the following structure: a flat pipe body 10, which is a metal material, has a flat and closed hollow pipe body type, and includes a top wall 11, a bottom wall 12, two side walls 13, 14 and a hollow chamber 15 comprising a heated end 16 and a condensing end 17, and the ends of the flat tube 10 are closed (as shown in Figure 1 for C1 and C2). The inner hollow chamber 15 is in a vacuum state; and the hollow chamber 15 of the flat tube 10 is filled with a working fluid (omitted from the drawing); at least one elongated woven mesh body 20 The metal material is provided with one of the top and bottom walls 11 and 12 positioned in the hollow chamber 15 of the flat tube body 10, and the length of the elongated braided mesh body 20 is set by the flat tube. The heated end 16 of the body 10 extends to the condensation end 17; at least one elongated porous sintered body 30, which is formed by sintering the metal material, is positioned at any position in the hollow chamber 15 of the flat tubular body 10 (this The elongated porous sintered body 30 of the embodiment is in the form of two sets of the side walls 13, 14 of the second side, and the length of the elongated porous sintered body 30 is extended from the heated end 16 of the flat tube 10 to the condensation. End 17; and wherein the porous sintered body 30 and the elongated woven mesh body 20 are combined in advance to be fixed into a composite capillary structure B, and the porous The sintered body 30 is bonded to the elongated woven mesh body 20 on one side and to the bottom wall 12 or the top wall 11 in the hollow chamber 15 in the flat tubular body 10 on the opposite side.

As shown in FIG. 7, the elongated woven mesh body 20 can form a partial hollow portion 21 corresponding to the intermediate portion between the heated end 16 and the condensing end 17 of the flat tubular body 10, and the elongated woven mesh body The intermediate portion of 20 is provided with a sintered body joint surface 22 for the fixed and fixed porous sintered body 30 to be fixedly combined; this embodiment can further reduce the volume occupied by the elongated woven mesh body 20, and can make a larger space. The steam guiding space is required to cope with the narrower heat pipe space, but does not affect the combined fixed state of the elongated woven mesh body 20 and the elongated porous sintered body 30.

As shown in FIG. 8, the elongated woven mesh body 20 may be partially sectioned and may be provided with a single or plural spaced apart notch portion 23 (which may be formed in a V-shaped or in-line notch state), thereby being woven by the elongated shape. The curved state of the mesh body 20, that is, by the design of the notch portion 23, when the elongated braided mesh body 20 is fitted with a flat heat pipe When the pattern is bent, the bending portion can avoid the occurrence of wrinkles due to the provision of the notch portion 23 (Note: if there is no notch design, the web body at the bending portion will have a wrinkle surface).

In addition, as shown in FIGS. 9 and 10, the elongated porous sintered body 30 may also be disposed at a position spaced apart from the sidewalls 13 and 14 in the hollow chamber 15 of the flat tubular body 10; Therefore, the elongated porous sintered body 30 and the side walls 13 and 14 can be further formed with a steam flow path space to improve the effect of the flow guiding effect, and the elongated porous sintered body 30 of the present embodiment has a cross-section of Rectangular aspect.

As shown in Fig. 11, a partial section or an intermediate section of the elongated porous sintered body 30 may be formed with at least one concave edge portion 31; whereby the design of the concave edge portion 31 is capable of achieving an increase in steam flow path space. In addition to the advantage of the volume, the elongated porous sintered body 30 can be partially removed by the concave edge portion 31, so that the curved porous shape of the elongated porous sintered body 30 is required in response to the bending of the flat heat pipe; The concave edge portion 31 may be one of an embodiment such as a sloped surface, an curved surface, or a stepped surface.

Wherein, the inner wall of the flat tube body 10 may be in the form of a smooth surface (as disclosed in FIG. 4); or the flat tube body 10 as disclosed in Fig. 12, the inner wall of which is formed The embodiment of the grooved capillary structure 18; by virtue of the shape design of the grooved capillary structure 18, a better condensate guiding effect can be obtained.

According to the above structural composition design, the preferred embodiment of the forming method for the composite capillary structure of the composite capillary structure of the present invention comprises the following steps (please refer to FIG. 13): (a) preparing a round pipe 10B, one end thereof Pre-closed, open at the other end; (b) prepare at least one elongated woven mesh body 20; (c) prepare at least one elongated porous sintered body of metal powder particles 30B, which are coated in a sintering mold 40 (d) sintering and bonding the elongated porous sintered body 30 by sintering means; Forming a composite capillary structure B on the surface of the elongated woven mesh body 20; (e) placing the previously prepared composite capillary structure B into the circular tubular material 10B; (f) placing the composite The round tube 10B of the composite capillary structure B is subjected to a flattening means to convert the round tube 10B into a flat tube 10D, and at the same time, the composite capillary structure B is positioned in the space of the flat tube 10D, and is placed inside the flat tube 10D. In the plane, (g) the composite capillary structure B and the flat tube 10D are fixed to each other by sintering means; (h) the flat tube 10D is subjected to a perfusion working fluid and a vacuum sealing means.

Moreover, the molding method of the present invention may also be a step of another embodiment (refer to FIG. 14): (a) preparing a metal round pipe 10B, one end of which is pre-closed and the other end is open. (b) preparing at least one elongated woven mesh body 20; (c) preparing at least one elongated porous sintered body of metal powder particles 30B, which is coated on the elongated woven mesh body 20 in a sintering mold 40; (d) sintering and bonding the elongated porous sintered body 30 to the surface of the elongated woven mesh body 20 by sintering means, thereby preliminarily preparing a composite capillary structure B; (e) the length of the composite capillary structure B The braided mesh body 20 is subjected to a bending means for forming a curved portion 24 in the elongated braided mesh body 20; (f) applying a first pre-flattening means to the round tubular material 10B to convert the round tubular material 10B into a The flat tube 10C, but the degree of flattening is only between 60% and 90% of the predetermined degree of flattening; (g) the composite capillary structure B is placed in the above-mentioned (d) process to obtain the prototype flat tube 10C (h) applying the first type of flat tube 10C to which the composite capillary structure B has been placed The second flattening means converts the prototype flat tube 10C into a fixed flat tube 10D, and at the same time, the elongated porous sintered body 30 of the composite capillary structure B is positioned at the side wall position of the flat tube 10D, and is placed on the side On the inner plane of the flat tube 10D, and tending to bend the curved portion 24 of the elongated woven mesh body 20 to be flat or nearly flat; (i) by combining means to make the composite capillary structure B and The flat tubes 10D are fixed to each other (which can be achieved by sintering means); (j) the flat tube 10D is subjected to a perfusion working fluid and a vacuum sealing means (the drawing of the flow is omitted); The invention discloses a flat heat pipe finished product with a composite capillary structure.

In the above method, the elongated porous sintered body 30 of the composite capillary structure B is preferably bonded to the side of the surface of the elongated woven mesh body 20 at the two sides.

Further, the round pipe 10B is subjected to a pre-flattening means into a split flat tube 10C, and the flat cross-sectional portion thereof may be a flattened type provided in all sections; or as shown in Fig. 15, the flat cross section The portion is a flattened type provided in a partial section; the flat section formed by the pre-flattening means prevents the unsintered fixed composite capillary structure B from being turned over and ectopically.

As shown in FIG. 16, the surface area of the elongated porous sintered body 30 may be formed on one or both sides of a concave-convex shape (which may be rectangular, curved, trapezoidal, or mountain-shaped, etc.). The portion 32 is increased, whereby the water vapor evaporation effect of the elongated porous sintered body 30 is increased, and a better heat transfer efficiency can be obtained.

Advantages of the invention:

1. In terms of the condensate guiding effect: the composite capillary structure design formed by the elongated woven mesh body combined with the elongated porous sintered body can be achieved by having both a planar and strip-shaped diversion structure High flow rate, high efficiency and better flow guiding effect.

2. In terms of the positioning property of the composite capillary structure, the elongated woven mesh body can be used to provide a planar and wide-spread positioning basic structure of the elongated porous sintered body, so that the composite capillary structure can obtain a relatively stable positioning property.

3. In terms of the steam guiding space: since the elongated woven mesh body has the characteristics of thin shape and no space occupation, the elongated porous sintered body is biased by the position of the side wall of the flat tubular body. Therefore, under the condition of better flow guiding effect, the invention can still provide the largest steam guiding space and obtain the best heat conduction performance.

4. In terms of the manufacturing surface: the invention combines the composite wick structure composed of the long woven mesh body and the elongated porous sintered body into the shape design of the flat heat pipe, and the method of manufacturing the heat pipe is first squashed and not in place. In a semi-flat state, and in combination with bending the elongated woven mesh body, the composite capillary structure is placed and then the heat pipe is flattened to the in-position state; thereby providing a method which can be implemented and has a simple process and a stable positioning. A combination of a particularly good flat heat pipe and a composite capillary structure.

The above embodiments are intended to be illustrative of the present invention, and are not to be construed as limiting the scope of the invention. The principles are changed and modified to achieve an equivalent purpose, and such changes and modifications are to be included in the scope defined by the scope of the patent application as described later.

A‧‧‧ flat heat pipe

B‧‧‧Composite capillary tissue

10B‧‧‧ round pipe

10C‧‧‧ prototype flat tube

10D‧‧‧ flat tube

10‧‧‧flat tube

11‧‧‧ top wall

12‧‧‧ bottom wall

13, 14‧‧‧ side walls

15‧‧‧ hollow room

16‧‧‧heated end

17‧‧‧condensing end

18‧‧‧Groured capillary tissue

20‧‧‧Long braided mesh body

21‧‧‧Local hollow parts

22‧‧‧Sintered body joint surface

23‧‧‧Gap section

24‧‧‧Bend

30‧‧‧Long porous sintered body

30B‧‧‧Metal powder

31‧‧‧Focus

32‧‧‧ Surface area amplification site

40‧‧‧Sintering mould

Fig. 1 is a perspective view showing a preferred embodiment of the flat heat pipe of the present invention.

Fig. 2 is an exploded perspective view showing a partial structure of a preferred embodiment of the present invention.

Figure 3 is a plan sectional view of a preferred embodiment of the present invention.

Figure 4 is a plan sectional view of a preferred embodiment of the present invention (which is a sectional view of a flat heat pipe).

Fig. 5 is a plan sectional view showing another embodiment of the elongated porous sintered body of the present invention.

Fig. 6 is a plan sectional view showing another embodiment of the elongated porous sintered body of the present invention (the cross-sectional state of the flat heat pipe).

Fig. 7 is a view showing an embodiment of the elongated woven mesh body of the present invention provided with a partial hollow portion.

Fig. 8 is a view showing an embodiment in which a long-shaped woven mesh body of the present invention is provided with a notch portion.

Fig. 9 is a plan sectional view showing still another embodiment of the elongated porous sintered body of the present invention.

Fig. 10 is a perspective view showing the embodiment of the embodiment shown in Fig. 9.

Fig. 11 is a view showing an embodiment in which a long-shaped porous sintered body of the present invention is provided with a concave portion.

Fig. 12 is a view showing an embodiment in which the inner wall of the flat tube of the present invention is formed with a grooved capillary structure.

Figure 13 is a schematic view showing the first step of the molding process of the present invention.

Figure 14 is a schematic view of the second step of the molding process of the present invention.

Fig. 15 is a view showing an embodiment of a round tube of the present invention which is converted into a flat tube by a pre-flattening means.

Figure 16 is a view showing another embodiment of the elongated porous sintered body of the present invention.

A‧‧‧ flat heat pipe

B‧‧‧Composite capillary tissue

10‧‧‧flat tube

11‧‧‧ top wall

12‧‧‧ bottom wall

13, 14‧‧‧ side walls

15‧‧‧ hollow room

20‧‧‧Long braided mesh body

30‧‧‧Long porous sintered body

Claims (3)

A method for forming a flat heat pipe with a composite capillary structure, comprising: (a) preparing a round pipe having one end pre-closed and the other end being open; (b) preparing at least one elongated woven mesh body; (c Preparing at least one elongated porous sintered body metal powder, which is coated on the elongated woven mesh body in a sintering mold; (d) sintering and bonding the elongated porous sintered body by sintering means Longly woven the surface of the mesh body, thereby preliminarily preparing a composite capillary structure; (e) placing the pre-made composite capillary structure into the round pipe; (f) the round pipe to which the composite capillary structure has been placed Applying the flattening means to convert the round pipe into a flat pipe, and at the same time, the composite capillary structure is positioned in the flat pipe space and is placed on the inner plane of the flat pipe; (g) the composite is made by sintering means The capillary structure and the flat tube are fixed to each other; (h) the flat tube is filled with a working fluid and a vacuum sealing means. The method for forming a flat heat pipe having a composite capillary structure according to the first aspect of the patent application, wherein the composite capillary structure is placed in a circular pipe material, and the elongated braided mesh body of the composite capillary structure is subjected to bending means. The elongated woven mesh body forms a curved portion; the circular tubular material is subjected to a pre-squashing means to convert the round tubular material into a prototype flat tube, but the flattening degree is only 60% of the predetermined flattening degree Between 90%; the composite capillary structure is placed in the prototype flat tube; then the second flattening means is applied to the prototype flat tube to convert the prototype flat tube into A flat tube, at the same time, tends to stretch the curved portion of the elongated woven mesh body into a flat shape or a flat shape. The method for forming a flat heat pipe having a composite capillary structure according to the second aspect of the patent application, wherein the round pipe is converted into a flat tube by a pre-flattening method, and the flat section is a whole section or The partial section is either of the flattened versions.