JP4584413B2 - Plate type heat pipe and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plate-type heat pipe that transports heat by moving a heat medium enclosed therein while changing its phase, and a method for manufacturing the same.
[0002]
[Prior art]
The prior art will be described taking a plate-type meandering pore heat pipe as an example.
Here, the meandering pore heat pipe is a heat pipe having the following characteristics (see Japanese Patent Laid-Open No. Hei 4-190090).
(1) Both ends of the pores (heat medium passage) are connected to each other so as to be freely flowable and sealed.
(2) The part with the pore is the heat receiving part, and the other part is the heat radiating part.
(3) The heat receiving portions and the heat radiating portions are alternately arranged, and the pores meander between the two portions.
(4) A two-phase condensable working fluid is sealed in the pores.
(5) The inner wall of the pore has a diameter equal to or less than the maximum diameter at which the working fluid can circulate or move while the inside of the pipe is always closed.
[0003]
Conventionally, the following two methods have been known as typical production methods for plate-type meandering pore heat pipes.
(1) Method using a grooved flat plate disclosed in JP-A-7-63487:
8A and 8B are views showing a heat pipe manufacturing method disclosed in JP-A-7-63487. FIG. 8A is a sectional view, and FIG. 8B is a partially broken plan view showing an internal structure. It is.
In this method, a series of long meandering narrow grooves 54 are formed on the surface of a thin metal plate 53 with good thermal conductivity by cutting or electric discharge machining. Next, a flat thin plate 55 is stacked on the surface of the thin plate 53, and both the plates 53 and 55 are laminated by brazing. The narrow groove 54 formed in the thin plate 53 becomes a closed meandering narrow tunnel (heat medium passage) 56 by stacking.
A working fluid is sealed in the tunnel 56.
[0004]
(2) A method using a porous flat tube of extruded material disclosed in JP-A-9-49692:
FIG. 9 is a view showing a method of manufacturing a heat pipe disclosed in Japanese Patent Laid-Open No. 9-49692. FIG. 9 (A) is a plan sectional view for explaining the first step, and FIG. It is a plane sectional view for explaining the 2nd process.
In the first step, a porous flat tube 63 of light metal such as aluminum or magnesium is used as a raw material. The porous flat tube 63 has a flat plate-like outer shape as a whole, and a large number of through-holes 64 arranged in parallel inside are formed by extrusion molding. Thereafter, the partition walls 66 at the ends of the pores 64 are cut every other line by the cut part 66a having a predetermined depth, and the cut part 66b is cut by shifting one line at the opposite end part. In the second step, the edge portions 68a and 68b are welded to both end surfaces, leaving a predetermined length from the deepest portion of the cut portions 66a and 66b. Each pore 64 communicates at the end to form a series of serpentine tunnels (heat medium passages), in which a working fluid is enclosed.
[0005]
[Problems to be solved by the invention]
In the two conventional plate-type heat pipes, the main direction in which the meandering pores extend is one direction in the vertical direction in the figure. Therefore, although the heat transport capability in that direction is high, the heat transport capability in the direction intersecting with the direction is low.
[0006]
An object of the present invention is to provide a plate-type heat pipe having various meandering pore shapes and high thermal efficiency.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, a plate-type heat pipe serving as a base of the present invention is a plate-type heat pipe having meandering pores in which a heat medium is enclosed; It consists of meandering pores extending mainly in the vertical direction in the plane where the heat pipe spreads, and meandering pores extending mainly in the lateral direction, and both meandering pores are interleaved in the plate thickness direction of the plate-type heat pipe. It is characterized by being.
Thereby, in the plane of a plate-type heat pipe, heat can be transported in various directions vertically, horizontally, and diagonally. Moreover, since both pores are intricate, heat transfer between the heat media in both pores is increased.
[0008]
The plate-type heat pipe of the present invention has a front plate and a back plate having grooves that constitute a space in which a heat medium is enclosed, and a plurality of through holes that connect the grooves of the front plate and the back plate. A middle plate joined so as to be sandwiched between the front plate and the back plate, and a groove in the front plate and the back plate and a through hole of the middle plate are the front plate or the back plate Pass through the through hole in the middle plate, pass through the through hole in the other plate of the front plate or the back plate, pass through the through hole in the intermediate plate again, and pass through the through hole in the intermediate plate. Forming a heat medium passage entangled with the front and back , reaching the groove of the plate, the heat medium path extending in a longitudinal direction mainly in a plane in which the plate heat pipe extends, and mainly in a lateral direction It consists of meandering pores that extend, and both meandering pores are in the thickness direction of the plate-type heat pipe Optionally convoluted in Oite alternately, as a whole, and wherein the forming a thermal medium passage you meandering in the vertical direction and the horizontal and vertical directions.
By changing the shape and arrangement of the grooves and holes, various forms of heat medium passages can be configured.
[0009]
In the plate-type heat pipe, the meandering pores are composed of meandering pores extending mainly in the vertical direction and meandering pores extending mainly in the lateral direction in a plane in which the plate-type heat pipe extends. It is preferable that the pores are alternately arranged in the plate thickness direction of the plate heat pipe.
[0010]
The plate type heat pipe manufacturing method of the present invention includes a step of forming grooves constituting a heat medium passage in which a heat medium is enclosed in a front plate and a back plate, and a hole connecting the grooves of the front plate and the back plate. A step of punching into the middle plate, a step of joining the front plate and the back plate so as to cover the middle plate on the front and back surfaces of the middle plate, a heat formed by the grooves of the front plate and the back plate and the holes of the middle plate And a step of enclosing a heat medium in the medium passage.
Thereby, the plate thickness and material of each plate can be arbitrarily selected, and the processing of the heating medium passage can be performed in various ways with high workability in accordance with the pattern shape.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, it demonstrates, referring drawings.
FIG. 1 is a sectional view showing the structure of a plate heat pipe according to the first embodiment of the present invention. FIG. 2 is a plan view showing a plate heat pipe according to the first embodiment of the present invention. FIG. 3 is a plan view showing a back plate used for the plate-type heat pipe according to the first embodiment of the present invention.
FIG. 2 shows a plate heat pipe 1 according to the first embodiment of the present invention. As shown in FIG. 2, the heat pipe 1 has a rectangular plate shape. In the heat pipe 1, the groove pattern of the working fluid formed in a lattice shape is indicated by broken lines.
[0012]
The cross section of the AA part below the figure of the heat pipe 1 is shown in FIG. In FIG. 1, a heat pipe 1 is composed of a front plate 3 at the top of FIG. 1, a back plate 5 at the bottom, and an intermediate plate 7 joined therebetween. An intermediate plate 7 is sandwiched between the front plate 3 and the back plate 5 and bonded by heating for a predetermined time in a state of being fixed by a jig to form a laminated heat pipe 1. As a joining method, methods such as brazing, adhesion with an adhesive, and laser welding can be used. In the case of brazing, a brazing material is applied to both sides of the middle plate 7 or one side of the front plate 3 and the back plate 5.
[0013]
The front plate 3 and the back plate 5 are flat plates made of a material such as aluminum or copper having a thickness of about 0.1 to 10.0 mm. A predetermined groove pattern is formed on the flat plate by cutting, pressing, etching, or the like.
FIG. 3 shows a groove pattern of the back plate 5. This groove pattern is provided at a pitch P having a plurality of linear patterns 11 and L-shaped patterns 13. In a standard case, the width of the groove pattern is 0.1 to 5.0 mm, the length of the linear pattern 11 is 0.5 to 18 mm, and the pitch P of the two linear patterns 11 arranged in the same direction is 0.1. -7.0 mm. In addition, a working fluid sealing port 15 is formed in two places on the left and right of the upper part of FIG. The working fluid is filled into the heat pipe 1 from the sealing port 15. The sealing port 15 is sealed by a method such as caulking or welding after putting a working fluid (heat medium).
[0014]
Although the back plate 5 is shown in FIG. 3, the groove pattern of the front plate 3 is similarly composed of a plurality of linear patterns 11 ′ and L-shaped patterns 13 ′ provided at a pitch P. However, the groove pattern of the front plate 3 is shifted from the arrangement of the back plate 5 by half of the pitch P, and is arranged so as to cross the groove pattern of the back plate 3 vertically. Therefore, the groove pattern of the front plate 3 and the back plate 5 is in a lattice shape in the heat pipe 1 as shown in FIG.
[0015]
The middle plate 7 is a plate made of a material such as aluminum or copper having a thickness of about 0.1 to 5.0 mm. Holes 17 are punched into this flat plate by cutting, pressing, etching, or the like. As shown in FIGS. 1 and 2, the hole 17 is opened at a position overlapping the ends of the groove patterns 11, 11 ′, 13, 13 ′ of the front plate 3 and the back plate 5. Thereby, as shown in FIG. 1, the groove patterns 11, 11 ′, 13, 13 ′ of the front plate 3 and the back plate 5 communicate with each other so as to meander in the vertical direction.
[0016]
As described above, since the heat medium passages are alternately formed in the plane of the plate-type heat pipe, the working fluid evaporates in the high temperature part and repeats condensation in the low temperature part to perform heat transport. Further, since the vertical meandering pores and the horizontal meandering pores are in contact with each other on three surfaces, heat transfer is good.
[0017]
Next, a plate heat pipe according to a second embodiment of the present invention will be described.
FIG. 4 is a cross-sectional view showing the structure of a plate heat pipe according to the second embodiment of the present invention. FIG. 5 is a plan view showing a plate-type heat pipe according to the second embodiment of the present invention.
FIG. 5 shows a plate heat pipe 31 according to a second embodiment of the present invention. As shown in FIG. 5, the heat pipe 31 has a rectangular plate shape. In the heat pipe 31, a groove pattern 32 of the working fluid is indicated by a broken line.
[0018]
FIG. 4 shows a cross section of the heat pipe 31 taken along the line BB below FIG. In FIG. 4, the heat pipe 31 includes a front plate 33 on the upper side of FIG. 4, a back plate 35 on the lower side, and an intermediate plate 37 joined therebetween. The groove pattern 32 of the front plate 33 and the back plate 35 is composed of a plurality of linear patterns and L-shaped patterns, as in the first embodiment. However, in the peripheral part of the heat pipe 31, the shape of the groove pattern is different from that of the first embodiment.
A hole 38 is formed at a position overlapping the end of the groove pattern 32 of the front plate 33 and the back plate 35 of the intermediate plate 37. Thereby, as shown in FIG. 4, the groove pattern 32 of the front plate 33 and the back plate 35 communicates so as to meander in the vertical direction.
[0019]
In the first embodiment, working fluid sealing ports 15 are formed at two locations of the heat pipe 1. However, in this embodiment, the sealing port 39 is formed only at one place on the left side of the lower part of the heat pipe 31 of FIG. The working fluid is filled into the heat pipe 31 from one sealing port 39. Thereby, since the sealing port 39 has only to be formed in one place on either one of the plates 33 and 35, pattern formation can be simplified. In addition, when the sealing port 39 is sealed after the working fluid 31 is filled with the working fluid, only one sealing port 39 needs to be sealed, so that the reliability is improved and the working time can be shortened.
[0020]
Next, a plate heat pipe according to a third embodiment of the present invention will be described.
FIG. 6 is a plan view showing a part of the back plate used in the plate heat pipe according to the third embodiment of the present invention. FIG. 7 is a cross-sectional view showing the structure of a plate heat pipe according to the third embodiment of the present invention.
As shown in FIG. 7, the heat pipe 41 according to the third embodiment of the present invention includes a top plate 43 at the top of FIG. 7, a back plate 45 at the bottom, and an intermediate plate 47 joined therebetween. It consists of.
[0021]
FIG. 6 shows a part of the groove pattern 42 of the back plate 45. Although only a plurality of linear patterns are shown in the drawing, the groove pattern 42 is actually provided at a pitch with a plurality of linear patterns and L-shaped patterns. In the first embodiment, the vertical and horizontal linear patterns 11 are alternately formed. However, in this embodiment, two linear patterns arranged in the same direction are alternately set as a set. Is formed.
[0022]
Similarly, the groove pattern 42 ′ of the front plate 43 is formed by alternately forming two linear patterns arranged in the same direction. However, the arrangement of the back plate 45 is shifted by one set, and the two linear patterns of the front plate 43 and the back plate 45 are arranged so as to cross vertically. For this reason, the groove patterns 42 and 42 ′ of the front plate 43 and the back plate 45 are not illustrated, but are in a lattice shape when viewed from the top of the heat pipe 41.
[0023]
A hole 48 is formed at a position overlapping the end portions of the groove patterns 42 and 42 ′ of the front plate 43 of the intermediate plate 47 and the back plate 45. Thereby, as shown in FIG. 7, the groove patterns 42 and 42 ′ of the front plate 43 and the back plate 45 communicate with each other so as to meander in the vertical direction.
The groove pattern can be selected from various other forms.
[0024]
While the plate heat pipe according to the embodiment of the present invention has been described with reference to FIGS. 1 to 9, the present invention is not limited to this, and various modifications can be added.
[0025]
【The invention's effect】
As is clear from the above description, according to the present invention, it is possible to have an arbitrary groove shape and improve the thermal efficiency.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing the structure of a plate heat pipe according to a first embodiment of the present invention.
FIG. 2 is a plan view showing a plate heat pipe according to the first embodiment of the present invention.
FIG. 3 is a plan view showing a back plate used for the plate-type heat pipe according to the first embodiment of the present invention.
FIG. 4 is a cross-sectional view showing the structure of a plate heat pipe according to a second embodiment of the present invention.
FIG. 5 is a plan view showing a plate heat pipe according to a second embodiment of the present invention.
FIG. 6 is a plan view showing a part of a back plate used in a plate heat pipe according to a third embodiment of the present invention.
FIG. 7 is a cross-sectional view showing the structure of a plate heat pipe according to a third embodiment of the present invention.
8A and 8B are diagrams showing a heat pipe manufacturing method disclosed in JP-A-7-63487, in which FIG. 8A is a cross-sectional view and FIG. 8B is a partially broken plan view showing an internal structure. It is.
FIG. 9 is a view showing a heat pipe manufacturing method disclosed in Japanese Patent Laid-Open No. 9-49692; FIG. 9 (A) is a plan sectional view for explaining the first step, and FIG. It is a plane sectional view for explaining the 2nd process.
[Explanation of symbols]
1, 31, 41 Plate type heat pipes 3, 33, 43 Front plate 5, 35, 45 Back plate 7, 37, 47 Middle plate 11, 11 'Linear pattern 13, 13' L-shaped pattern 15, 39 Filling port 17 hole 32, 42, 42 'groove pattern 38, 48 hole 53 thin plate 54 thin groove 55 flat thin plate 56 small diameter tunnel 63 flat plate 64 pore 66 partition 66a cut part 66b cut part 68a edge part 68b edge part

Claims (3)

A front plate and a back plate having grooves forming a space in which the heat medium is enclosed;
An intermediate plate that is joined so as to be sandwiched between the front plate and the back plate, having a plurality of through-holes that connect grooves of the front plate and the back plate, but not having the groove,
Comprising
The groove of the front plate and the back plate and the through hole of the middle plate pass through the through hole of the middle plate through the groove of one plate of the front plate or the back plate, and then the front plate or the back plate Forming a heat medium passage entangled with the front and back, passing through the groove of the other plate, and again passing through the through hole of the intermediate plate and reaching the groove of the one plate ,
The heat medium passage is composed of meandering pores extending mainly in the vertical direction in a plane in which the plate heat pipe extends, and meandering pores extending mainly in the lateral direction,
Both meander pores is not intricate alternately in the thickness direction of the plate-type heat pipe, as a whole, the plate-type heat pipe, characterized by forming a thermal medium passage you meandering in the vertical direction and the horizontal and vertical directions . Grooves of the front plate and the back plate extend in a lateral direction with a linear pattern groove extending in a vertical direction, a linear pattern groove extending in a horizontal direction, and a groove extending in a vertical direction in a plane in which the plate heat pipe extends. It consists of L-shaped pattern grooves with intersecting grooves,
The linear pattern grooves extending in the vertical direction and the linear pattern grooves extending in the horizontal direction are alternately arranged,
The plate-type heat pipe according to claim 1, wherein the L-shaped pattern groove is disposed in a portion close to a side of the plane. Forming a groove constituting a heat medium passage in which the heat medium is enclosed in the front plate and the back plate;
Punching holes in the middle plate connecting the grooves of the front plate and the back plate,
Joining the front plate and the back plate so as to cover the middle plate on the front and back surfaces of the middle plate;
Encapsulating a heat medium in a heat medium passage formed by grooves in the front plate and the back plate and holes in the intermediate plate;
The plate-type heat pipe manufacturing method according to claim 1 or 2, characterized by comprising:

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