JP2000171181A - Heat pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease a pressure loss of a liquid fluid and to increase a heat transporting capability by forming an axial groove on an inner wall of a heat pipe container, bringing an outer periphery of a wick into close contact with an end of a ridge of the groove, inserting it into the container, sealing an operating liquid in the wick, and impregnating the liquid. SOLUTION: When an evaporator 8 of one axial end of a heat pipe container 2 is heated, its heat is transmitted from a ridge 11 of a groove 10 of the container 2 to a wick 3, an operating liquid 5 in the wick 3 absorbs a heat to evaporate, and hence vapor 6 is generated near the evaporator 8 in the groove 10. The vapor 6 axially flows in the groove 10 from the evaporator 8 side toward a condenser 9 side according to a temperature difference between the evaporator 8 and the condenser 9 of the container 2, and arrives at the condenser 9 as its vapor phase remains as it is. Thus, since the overall inner space can be used as a liquid channel 3a, a pressure loss of the channel 3a is reduced, and a heat transporting capability of the pipe 1 is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pipe used as a heat transport device for space, industry, home and the like.

[0002]

2. Description of the Related Art FIG. 9A is a shaft showing a conventional heat pipe disclosed in, for example, heat pipe engineering (author: Koichi Oshima, two people, first edition on November 30, 1979, published by Asakura Shoten Co., Ltd.). 9B is a cross-sectional view taken along line HH of FIG. 9A. In the figure, reference numeral 1 denotes a heat pipe, 2 denotes a heat pipe container having a circular cross section serving as a main body of the heat pipe 1, and 3 denotes a wick provided in close contact with the inner peripheral surface of the heat pipe container 2. Is made of a porous material such as a wire mesh or a sintered metal. Reference numeral 4 denotes an artery (liquid flow path) inserted into the wick 3 in contact with the inner bottom surface of the wick 3, and the artery 4 is formed of a wire mesh or the like and has a circular tubular shape having a diameter larger than the pore diameter of the wick 3. Has made. Reference numeral 5 denotes a working liquid that penetrates the wick 3 and the artery 4. The working liquid 5 is made of water, ammonia, alcohol, or the like. Reference numeral 6 denotes steam generated inside the heat pipe container 2 and serving as a working fluid for heat transport.
Is a vapor phase space 7 in which portions other than the wick 3 and the artery 4 are filled with the vapor 6.
Reference numeral 8 denotes an evaporating unit set at one axial end of the heat pipe 1, and 9 denotes a condensing unit set at the other axial end of the heat pipe 1.

Next, the operation will be described. When the evaporating section 8 at one end of the heat pipe 1 is heated, the working liquid 5 in the wick 3 absorbs heat and evaporates to generate steam 6, and the steam 6 passes through the vapor phase space 7 to form a vapor phase. As it reaches the condensing section 9 at the other end of the heat pipe 1 as it is and is cooled by the condensing section 9, the vapor 6 in the gas phase emits heat and condenses to become a liquid (working liquid 5). And the condensing part 9
The working liquid 5 in the inside returns to the evaporating section 8 through the artery 4 and the wick 3 by capillary pressure. By repeating the above cycle, heat transport from the evaporating section 8 to the condensing section 9 is performed.

[0004]

The conventional heat pipe is constructed as described above.
The inside of the wick 3 closely contacting the inner peripheral surface of the wick 3 is a vapor phase space 7, and the artery 4 is inserted into the vapor phase space 7 in contact with the inner bottom surface of the wick 3. In order to maintain a predetermined vapor phase space 7 in a part other than the artery 4 inside, the diameter of the heat pipe container 2 cannot be reduced, so that the space efficiency is poor and the flexibility is not obtained. was there.
Further, even in the artery 4, as described above, the predetermined vapor phase space 7 must be maintained inside the wick 3, so that the outer diameter of the artery 4 cannot be increased. However, there has been a problem that the pressure loss in the artery 4 becomes large and a predetermined heat transporting ability cannot be obtained. Furthermore, since the artery 4 is in the vapor phase space 7,
The working liquid 5 inside the artery 4 is heated by the steam 6 to generate air bubbles in the artery 4 and clog the inside of the artery 4, so that the flow of the liquid in the artery 4 is obstructed, and the predetermined heat transport capacity is reduced. There was a problem that it could not be obtained.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the entire internal space of a wick can be used as a liquid flow path, and the pressure loss in the liquid flow path is reduced, resulting in heat transport. The purpose is to obtain a heat pipe with increased capacity.

Another object of the present invention is to provide a heat pipe capable of reducing the diameter of a pipe for obtaining a cross-sectional area of a liquid flow path necessary for obtaining a predetermined heat transfer capability.

Further, according to the present invention, the working liquid can be smoothly and reliably penetrated into the entire wick, a stable liquid flow can be obtained, and the reliability of the heat transfer operation without stopping the operation can be improved. The aim is to obtain a high heat pipe.

Another object of the present invention is to obtain a heat pipe having high flexibility.

Another object of the present invention is to provide a heat pipe having a small thermal difference between the evaporating section and the condensing section and having a large thermal conductance.

[0010]

In the heat pipe according to the present invention, an axial groove is formed on the inner wall surface of the heat pipe container, and the outer peripheral surface of the wick is brought into close contact with the tip of the groove of the groove, and the wick is connected to the heat pipe. It is inserted into a heat pipe container, a working liquid is sealed in the wick, and the working liquid permeates the wick.

In the heat pipe according to the present invention, an axial groove is formed on the outer peripheral surface of the wick, and the tip of the groove crest of the groove is brought into close contact with the inner wall surface of the heat pipe container so that the wick is inserted into the heat pipe container. The working liquid is inserted into the wick, and the working liquid is permeated into the wick.

The wick of the heat pipe according to the present invention has a larger pore diameter on the radially inner side than on the radially outer side.

The wick of the heat pipe according to the present invention has a larger radially outer heat conductivity than a radially inner wick.

The wick of the heat pipe according to the present invention is made of an elastic porous material.

In the heat pipe according to the present invention, a circumferential groove is formed on the inner peripheral surface of the wick.

In the heat pipe according to the present invention, a small circumferential groove is formed at the end of the groove on the inner wall surface of the heat pipe container.

In the heat pipe according to the present invention, a small circumferential groove is formed at the tip of the groove on the outer peripheral surface of the wick.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1A is an axial sectional view showing a heat pipe according to Embodiment 1 of the present invention.
FIG. 1B is a cross-sectional view taken along line AA in FIG.
Parts that are the same as or correspond to those in FIG. In the figure, 1 is a heat pipe, 2 is a heat pipe container having a circular cross section, and this heat pipe container 2
It is made of a metal material such as copper, aluminum, and stainless steel. Reference numeral 10 denotes a plurality of grooves formed at predetermined intervals in the circumferential direction of the inner wall surface of the heat pipe container 2 and extends in the axial direction of the heat pipe container 2 to form a steam flow path. There is a wick 3 at the tip of this groove 11
The wick 3 is inserted into the heat pipe container 2 with the outer peripheral surface of the wick 3 closely contacted.

The wick 3 is made of a resilient tubular porous material such as a porous Teflon tube, and a working liquid (working fluid) 5 is sealed in the tubular inner space. Liquid passage 3a,
The working liquid 5 in the liquid flow path 3 a permeates the wick 3. On the other hand, the groove 10 forms a steam flow path (steam phase space) for filling the steam 6 generated when the working liquid 5 absorbs heat and evaporates from the wick 3 on the inner peripheral surface of the heat pipe container 2. And the outer peripheral surface of the wick 3 in the axial direction.

Next, the operation will be described. When the evaporator 8 at one end in the axial direction of the heat pipe container 2 is heated, the heat is transferred from the groove 11 of the heat pipe container 2 to the wick 3, and the working liquid 5 in the wick 3 absorbs the heat. By the evaporation, steam 6 is generated in the vicinity of the evaporating section 8 in the groove 10, and the steam 6 is generated by the temperature difference between the evaporating section 8 side and the condensing section 9 side of the heat pipe container 2. As shown by a dotted arrow in FIG. 1A, the gas flows in the axial direction from the evaporating section 8 side to the condensing section 9 side, and reaches the condensing section 9 in a gaseous state.

The vapor 6, which is a gas-phase working fluid that has reached the condensing section 9, is radiated and condensed by being cooled in the condensing section 9 to become a working liquid 5. Through the capillary pressure, and returns to the evaporator 8 through the inside of the wick 3 (liquid flow path 3a). This evaporator 8
Then, the working liquid 5 inside the wick 3 permeates the wick 3 again, and the permeated working liquid 5 absorbs heat generated by the heating in the evaporating section 8 and evaporates into the groove 10. In this way, the working fluid (working liquid 5 / steam 6) circulates inside the heat pipe 1 and the evaporator 8 of the heat pipe 1
Is transferred to the condenser 9.

According to the first embodiment described above, the axial groove 10 is formed on the inner peripheral surface of the heat pipe container 2, and the steam 6 evaporated in the evaporating section 8 moves the groove 10 to the condensing section 9 side. Since it flows in the axial direction, it is not necessary to provide the artery 4 in FIG. 9 in the wick 3 as in the prior art, and the entire internal space of the wick 3 can be used as the liquid flow path 3a. There is an effect that the loss is reduced and the heat transport capacity of the heat pipe 1 is increased. Further, it is possible to reduce the diameter of a pipe for obtaining a cross-sectional area of the liquid flow path 3a necessary for obtaining a predetermined heat transport ability, and as a result, it is possible to make the heat pipe 1 elastic. Since the wick 3 is made of a porous material having elasticity, the heat pipe 1 having high flexibility can be obtained.

Further, according to the first embodiment, the liquid flow path 3a comprising the entire internal space of the wick 3 is
Is separated from the steam 6 in the groove 10 by
The working liquid 5 in the liquid flow path 3a is not directly heated by the vapor 6, so that bubbles are less likely to be generated in the working liquid 5 in the liquid flow path 3a, and the liquid flow path 3a is blocked by the bubbles. There is an effect that the reliability in the heat transport operation is improved without peeling.

Embodiment 2 FIG. FIG. 2A is a sectional view taken along the axial direction showing a heat pipe according to Embodiment 2 of the present invention, and FIG. 2B is a sectional view taken along line BB of FIG. 2A. The same or corresponding parts as those in FIGS. 1 and 9 are denoted by the same reference numerals, and redundant description will be omitted. In the figure, 12
Is an axial groove provided on the outer peripheral surface of the wick 3 made of an elastic tubular porous material such as a porous Teflon tube, and 13 is a groove of the groove 12. The wick 3 is inserted into the heat pipe container 2 by bringing the tip end surface of the heat pipe container 2 into close contact with the inner peripheral surface of the heat pipe container 2 having a circular cross section, and the working liquid 5 is sealed in the wick 3. This constitutes a pipe 1.

That is, in the first embodiment described above, the axial groove 1 is formed in the inner peripheral surface of the heat pipe container 2 having a tubular cross section.
0 is formed, and the outer peripheral surface of the wick 3 having a cylindrical cross section is adhered to the groove 11 of the groove 10 at the tip end surface. However, in the second embodiment, the wick 3 is opposite to the case of the first embodiment. 3
A groove 12 in the axial direction is formed on the outer peripheral surface of the heat pipe container 2, and the distal end surface of a groove 13 of the groove 12 is in close contact with the inner peripheral surface of the heat pipe container 2 having a circular cross section. Therefore, in the case of the second embodiment, the same operation and effect as those of the first embodiment can be obtained.

Embodiment 3 FIG. FIG. 3A is a cross-sectional view along the axial direction showing a heat pipe according to Embodiment 3 of the present invention, and FIG. 3B is a cross-sectional view along line CC in FIG. The same or corresponding parts as those in FIG. In the figure, 14 is a heat pipe container 2
The first tubular wick (wick) 15 inserted into the heat pipe container 2 with the outer peripheral surface in close contact with the tip end surface of the groove 11 is closely attached to the inner peripheral surface of the first wick 14. The second wick (wick) inserted into the first wick 14, and the working liquid 5 is sealed in the second wick 15 so that the inside of the second wick 15 flows through the liquid. Road 15a. Reference numeral 15b denotes a vapor phase generated in the liquid flow path 15a.

Here, the first and second wicks 14,
15 is made of a porous material having elasticity as in the case of the wick 3 of the first embodiment, but the second wick 15 has a pore diameter and a porosity that are smaller than those of the first wick 14. It has become big.

That is, in the third embodiment, the first wick 14 and the second wick 15 have a wick configuration composed of a double circular tube, and the pore diameter in the radial direction is outside (the first wick 14). Is small and the inside (the second wick 15) is large. here,
The first wick 14 and the second wick 15 may be integrally formed into one wick. In short, the wick has a tubular wall in either a single tube configuration or a double tube configuration. Any material may be used as long as it is formed of a porous material in which the pore diameter and the porosity on the inner diameter side of the tubular wall are larger than the pore diameter and the porosity on the outer diameter side.

The operation of the heat pipe 1 according to the third embodiment other than the above and the operation of transferring heat from the evaporating section 8 to the condensing section 9 by circulation of the working fluid are the same as those of the first embodiment.
Therefore, the same or corresponding parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

According to the third embodiment described above, even if the vapor phase portion 15b is generated in the liquid flow path 15a (inside the second wick 15) due to a liquid shortage or the generation of bubbles, the liquid flow path 15a Since the pore diameter and the porosity of the second wick 15 directly immersed in the working liquid 5 are larger than the pore diameter and the porosity of the first wick 14, the working liquid 5 in the liquid flow path 15a is The wick 15 smoothly penetrates and penetrates the entire first wick 14 efficiently and reliably, so that the ideal liquid flow is always obtained and the heat transport operation does not stop. As a result, the heat transport operation The effect that the above reliability is improved is obtained.

Embodiment 4 FIG. FIG. 4 is a cross-sectional perspective view showing a heat pipe according to Embodiment 4 of the present invention. In the figure, reference numeral 3b denotes a vapor phase portion caused by liquid shortage or bubble generation in the wick 3, and 16 denotes an inner peripheral surface of the wick 3. Are provided in the circumferential groove. That is, the fourth embodiment
In this embodiment, a circumferential groove 16 is provided on the inner peripheral surface of the wick 3 according to the first embodiment, and the working liquid 5 is caused to flow by capillary action occurring in the circumferential groove 16. Since the other configuration and heat transport operation of the heat pipe 1 according to the fourth embodiment are the same as those of the first embodiment, the same parts as those of the first embodiment are denoted by the same reference numerals and description thereof will be omitted.

According to the fourth embodiment described above, even when the vapor phase portion 3b is generated in the liquid flow path 3a inside the wick 3 due to a liquid shortage or the generation of bubbles, the circumferential groove 16 on the inner peripheral surface of the wick 3 is formed. When the working liquid 5 flows by the capillary action, the working liquid 5 can uniformly permeate the entire area of the wick 3 from the circumferential groove 16, and as in the case of the third embodiment, the working liquid 5 is always ideal. Thus, there is no possibility that a liquid flow is obtained and the heat transport operation is not stopped. As a result, the effect of improving reliability is obtained.

Embodiment 5 FIG. FIG. 5 is an axial sectional view of a heat pipe according to Embodiment 5 of the present invention. In the figure, reference numeral 17 denotes a first tubular wick (wick) inserted into the heat pipe container 2 with the outer peripheral surface brought into close contact with the front end surface of the groove 11 of the heat pipe container 2. For example, it is formed of a cylindrical metal porous tube (metallic porous material) such as stainless steel or nickel. Reference numeral 18 denotes a second wick (wick) inserted into the first wick 17 in close contact with the inner peripheral surface of the first wick 17, and the wick 18 is made of a material such as polyethylene or the like. Is also made of a non-metallic porous material having a low thermal conductivity. The working liquid 5 is sealed in the second wick 18, and the inside of the second wick 18 is a liquid flow path 18a.
Reference numeral 18b denotes a vapor phase portion generated in the liquid flow path 18a.

That is, in the fifth embodiment, a wick structure composed of a double circular tube composed of the first wick 17 and the second wick 18 is used, and the wick 17 outside (first) has a large thermal conductivity. The inner (second) wick 18 is formed of a porous material having a low thermal conductivity. Here, the first wick 17
The second wick 18 and the second wick 18 may be integrally formed into one wick. In short, the wick is formed on the outer diameter side of the tubular wall in either the single tube configuration or the double tube configuration. Any material may be used as long as it is formed of a porous material having a high thermal conductivity and a low thermal conductivity on the inner diameter side of the tubular wall.

The other structure of the heat pipe 1 according to the fifth embodiment and the operation of transferring heat from the evaporating section 8 to the condensing section 9 by circulation of the working fluid are the same as those of the first embodiment.
Therefore, the same or corresponding parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

According to the fifth embodiment described above, since the first wick 17 that is in close contact with the groove 11 of the heat pipe container 2 is formed of a porous material having a high thermal conductivity, the working liquid 5 and the vapor 6 resulting from the evaporation
1st wick 1 from heat pipe vessel 2 which condenses
The heat flow to the working liquid 5 penetrating into 7 is smoothly and stably performed, and in the evaporating section 8 and the condensing section 9 set in the heat pipe container 2 as in the first embodiment,
The temperature difference generated between the heat pipe container 2 and the first wick 17 is reduced, so that the heat conductance of the heat pipe 1 is increased. In addition, since the second wick 18 inscribed in the first wick 17 has a low thermal conductivity, the working liquid 5 in the liquid flow path 18a is
The liquid inside the working channel 5 in the liquid flow path 18a is less likely to be heated by the vapor inside the liquid flow path 18a, so that the liquid flow path 18a is not blocked by the air bubbles, and the reliability in the heat transport operation is improved. There is an effect that is improved.

Embodiment 6 FIG. FIG. 6A is a cross-sectional view along the axial direction showing a heat pipe according to Embodiment 6 of the present invention, FIG. 6B is a cross-sectional view along the line DD in FIG. In the figure, reference numeral 19 denotes a circumferential minute groove provided on the distal end surface of the groove 11 on the inner peripheral surface of the heat pipe container 2, and the minute groove 19 has a predetermined interval in the axial direction of the distal end surface of each groove 11. Are provided, and communicate with each other between the grooves 10 partitioned by the groove ridges 11. That is, in the sixth embodiment, the heat pipe container 2 according to the first embodiment is provided with the minute grooves 19 in the axial direction on the distal end surface of the groove 11. The other configuration and heat transport operation of the heat pipe according to the sixth embodiment are the same as those of the first embodiment, and therefore description thereof is omitted, and the same parts as those of the first embodiment are denoted by the same reference numerals.

According to the sixth embodiment described above, in the heat pipe container 2, the microscopic groove 19 in the circumferential direction is provided on the tip end surface of the groove 11 that is in close contact with the outer peripheral surface of the wick 3, so that the wick 3 The contact side length between the heat pipe container 2 and the wick 3 is long (the contact area of the working fluid between the heat pipe container 2 and the wick 3 is large), so that the heat transfer efficiency is improved. 5, since the temperature difference between the heat pipe container 2 and the wick 3 becomes small, and the heat conductance of the heat pipe 1 becomes large. Also in the condensing section 9, the condensing area formed by the grooves 10 and the groove peaks 11 is increased by the minute grooves 19, and the temperature difference between the heat pipe container 2 and the wick 3 is reduced, so that the heat conductance of the heat pipe 1 is reduced. Has the effect of increasing.

Embodiment 7 FIG. 7A is a cross-sectional view along the axial direction showing a heat pipe according to Embodiment 7 of the present invention, FIG. 7B is a cross-sectional view along the line EE in FIG. In the figure, reference numeral 20 denotes a groove 1 around the wick 3
3, a plurality of microgrooves 20 are provided at predetermined intervals in the axial direction of the front end surface of each groove 13 and are divided by the grooves 13. The grooves 12 communicate with each other. That is, in the seventh embodiment, the minute groove 20 in the axial direction is provided on the tip end surface of the groove 13 of the wick 3 according to the second embodiment. In addition,
Other configurations and heat transport operations of the heat pipe according to the seventh embodiment are the same as those of the second embodiment, and therefore description thereof is omitted, and the same parts as those of the second embodiment are denoted by the same reference numerals.

According to the seventh embodiment described above, the groove 1 of the wick 3 which is in close contact with the inner peripheral surface of the heat pipe container 2
3, the contact side length between the heat pipe container 2 and the groove 13 is longer due to the minute groove 20 (between the heat pipe container 2 and the wick 3). The contact area of the working fluid is increased), the heat transfer efficiency is improved, and in the evaporating section 8, the working liquid 5 is easily evaporated and the temperature difference between the heat pipe container 2 and the wick 3 is reduced. 1 has the effect of increasing the thermal conductance. Also, in the condensing section 9,
The condensing area consisting of the groove 12 and the groove crest 13
Heat pipe container 2 and wick 3
Is smaller, and the heat conductance of the heat pipe 1 is increased.

Embodiment 8 FIG. 8A is a cross-sectional view along the axial direction showing a heat pipe according to Embodiment 8 of the present invention, FIG. 8B is a cross-sectional view along line FF in FIG. FIG. 9C is a sectional view taken along line GG of FIG. In the figure, 1 is a heat pipe, 2 is a heat pipe container having a circular cross section, and this heat pipe container 2
Is made of a metal material such as copper, aluminum, and stainless steel, and has an evaporator 8 at one end in the axial direction and a condenser 9 at the other end in the axial direction, as in the first embodiment. Have.

Reference numeral 10a denotes an axial groove provided on the inner wall surface of the heat pipe container 2 on the side of the evaporator 8; 10b denotes an axial groove provided on the inner wall surface of the heat pipe container 2 on the side of the condenser 9; Is the groove peak of the groove 10a on the side of the evaporating section 8,
11b is a groove of the groove 10b on the side of the condenser 9; 31a is an evaporator inserted into only the region of the evaporator 8 in the heat pipe container 2 with the outer peripheral surface in close contact with the tip surface of the groove 11a on the side of the evaporator 8; The first wick (wick) 31b on the part 8 side is a condenser part inserted only in the region of the condenser part 9 in the heat pipe container 2 with the outer peripheral surface brought into close contact with the tip end surface of the groove 11b on the condenser part 9 side. This is the first wick (wick) on the ninth side, and the first wicks 31a and 31b are made of a circular metal porous tube (metallic porous material) such as stainless steel or nickel.

Reference numeral 32 denotes a second wick which straddles each of the first wicks 31a and 31b and has an outer peripheral surface at both ends in close contact with the inner wall surfaces of the first wicks 31a and 31b. It is made of a cylindrical porous material having properties. 33a is the second wick 3
The third wick (wick) 33b on the side of the evaporator 8 inscribed only on the side of the evaporator 8 of the second wick 32 is a third wick on the side of the condenser 9 inscribed only on the side of the condenser 9 of the second wick 32. Wicks (wicks), and the third wicks 33a and 33b
Has a larger pore diameter and a lower porosity than each of the first wicks 31a and 31b and the second wick 32, and has a smaller thermal conductivity than the first wicks 31a and 31b. Made of a non-metallic porous material. Therefore, the first wick 3
1a and 31b are made of a tubular metal porous material having a higher thermal conductivity than the second wick 32 and the third wicks 33a and 33b.

Numeral 34 designates a series of liquid flow paths comprising the respective internal spaces of the second wick 32 and the third wicks 33a and 33b. 5 is all the wicks 31a,
31b, 32, 33a, 33b.

Reference numeral 35 denotes a steam flow path formed between the inner peripheral surface of the heat pipe container 2 and the outer peripheral surface of the second wick 32 between the evaporator 8 and the condenser 9. The groove 35 communicates with the groove 10a on the evaporating section 8 side and the groove 10b on the condensing section 9 side.

Next, the operation will be described. When the evaporator 8 of the heat pipe 1 is heated, the heat is transferred from the groove 11a on the evaporator 8 side of the heat pipe container 2 to the first wick 31a.
The working liquid 5 that has been transmitted to the wick 31a absorbs the heat and evaporates, so that the evaporating section 8
Steam 6 is generated in the side groove 10a. This steam 6
Due to the temperature difference between the evaporating section 8 side and the condensing section 9 side of the heat pipe vessel 2, the steam flow path 35 is moved from the groove 10a to the position shown in FIG.
As shown by the dotted arrow in (a), the gas flows in the axial direction toward the condensing section 9 and reaches the condensing section 9 in a gaseous state.

The gaseous vapor 6 arriving at the condenser 9 is radiated and condensed by being cooled by the condenser 9 to become a working liquid 5. The working liquid 5 is condensed by the first wick 31 b in the condenser 9. , The second wick 32, the third wick 33b
Are transmitted by the capillary pressure and return to the inside of the third wick 33a on the evaporation unit 8 side through the liquid flow path 34. Then, the working liquid 5 returning to the evaporating section 8 is supplied to the third wick 33a, the second wick 32, and the first wick 31a.
Re-infiltrate into each of the. The permeated working liquid 5 absorbs heat generated by the heating in the evaporating section 8 and evaporates into the groove 10a. In this manner, the working fluid (working liquid 5 / steam 6) circulates inside the heat pipe 1 to transfer heat from the evaporator 8 to the condenser 9 of the heat pipe 1.

According to the eighth embodiment described above, the vapor 6 evaporated in the evaporating section 8 flows in the axial direction from the groove 10a on the evaporating section 8 side through the vapor flow path 35. There is no need to provide a steam flow path, and the third wick 33a,
Since the entirety of a series of wick internal spaces including the inside of the inside 33b and the inside of the second wick 32 that communicates with each other becomes the liquid flow path 34, the pressure loss in the liquid flow path 34 becomes small, and the heat pipe 1 This has the effect of increasing the heat transport capacity of the device. Further, it is possible to reduce the diameter of a pipe for obtaining a cross-sectional area of the liquid flow path 34 necessary for obtaining a predetermined heat transport capacity, and as a result, it is possible to make the heat pipe 1 elastic. It has the effect of becoming.
Furthermore, since the second wick 32 is made of a porous material having elasticity, there is an effect that the heat pipe 1 with even more flexibility can be obtained.

According to the eighth embodiment, the liquid flow path 34 and the vapor flow path 35 are separated by the second wick 32, and the liquid flow path 3
4 is surrounded by the third wicks 33a and 33b having a small thermal conductivity, the working liquid 5 flowing through the liquid flow path 34 is not directly heated by the vapor 6, and as a result, Bubbles are less likely to be generated in the working liquid 5 in the flow path 34, and the liquid flow path 34 is not blocked by the bubbles, so that the reliability of the heat pipe 1 in the heat transport operation is improved. .

Further, according to the eighth embodiment, even when a vapor phase portion is generated in the liquid flow path 34 due to a shortage of liquid or the generation of bubbles, the liquid flow path 34 is formed in the same manner as in the third embodiment.
The working liquid 5 in the evaporating section 8 sequentially permeates into the second wick 32 and the first wick 31a through the third wick 33a having a large pore diameter and a large porosity, so that the ideal liquid is always obtained. As a result, the heat transfer operation is not stopped so that the heat pipe 1
This has the effect of improving the reliability of the device.

Further, according to the eighth embodiment, the first wicks 31a, 31a on the evaporating section 8 side and the condensing section 9 side are used.
b is made of a porous material having a higher thermal conductivity than the other wicks 32, 33a and 33b and is formed in a tubular shape, so that the heat pipe container 2 for evaporating the working liquid 5 and condensing the vapor generated by the evaporation. From the first wick 31a,
The heat flow to the working liquid 5 penetrating into the working liquid 5 is smoothly and stably performed, and the heat pipe container 2 and the first wicks 31a, 31
b, the temperature difference between the heat pipe 1 and the heat pipe 1
This has the effect of increasing the thermal conductance of the substrate. Moreover, the third wick 3 inscribed in the second wick 32
Since the working fluid 3a and 33b have low thermal conductivity, the working liquid 5 in the liquid flow path 34 is hardly heated by the vapor 6, and no bubbles are generated in the working liquid 5 in the liquid flow path 34. There is no effect that the air bubbles 34 are blocked by the air bubbles, and the reliability of the heat transport operation is improved.

[0052]

As described above, according to the present invention, an axial groove is formed on the inner wall surface of the heat pipe container, and the outer peripheral surface of the wick is brought into close contact with the tip of the groove of the groove to heat the wick. Since it is inserted into a pipe container, the working liquid is sealed in the wick, and the working liquid is penetrated into the wick, there is no need to provide an artery inside the wick as in the related art, and the internal space of the wick is eliminated. The whole becomes a liquid flow path, and therefore, there is an effect that the pressure loss in the liquid flow path is reduced and the heat transport capability of the heat pipe is increased. In addition, as described above, the entire internal space of the wick serves as a liquid flow path, and the groove between the inner wall surface of the heat pipe container and the outer peripheral surface of the wick serves as a vapor flow path. The diameter of the pipe for obtaining the cross-sectional area of the liquid flow path necessary for obtaining the liquid pipe can be reduced, and as a result, there is an effect that the heat pipe can have elasticity. Further, since the working liquid flowing through the liquid flow path composed of the internal space of the wick and the groove forming the vapor flow path are separated by the wick, the working liquid in the liquid flow path is directly vaporized. Without being heated,
For this reason, bubbles are less likely to be generated in the working liquid in the liquid flow path, and the liquid flow path is not blocked by the air bubbles, so that there is an effect that reliability in the heat transport operation is improved.

According to the present invention, an axial groove is formed on the outer peripheral surface of the wick, and the tip of the groove is closely attached to the inner wall surface of the heat pipe container, and the wick is inserted into the heat pipe container. Since the working liquid is sealed in the wick and the working liquid is allowed to permeate the wick, there is no need to provide an artery inside the wick as in the prior art, and the entire internal space of the wick becomes a liquid flow path. ,
For this reason, there is an effect that the pressure loss in the liquid flow path is reduced and the heat transport capability of the heat pipe is increased. In addition, as described above, the entire internal space of the wick serves as a liquid flow path, and the groove between the inner wall surface of the heat pipe container and the outer peripheral surface of the wick serves as a vapor flow path. The diameter of the pipe for obtaining the cross-sectional area of the liquid flow path necessary for obtaining the liquid pipe can be reduced, and as a result, there is an effect that the heat pipe can have elasticity.
Further, since the working liquid flowing through the liquid flow path composed of the internal space of the wick and the groove forming the vapor flow path are separated by the wick, the working liquid in the liquid flow path is directly vaporized. The heating liquid is not heated, so that air bubbles are hardly generated in the working liquid in the liquid flow path, and the liquid flow path is not blocked by the air bubbles. There is an effect of improving.

According to the present invention, the wick is configured so that the pore diameter on the radially inner side is larger than that on the radially outer side of the wick. Even when a vapor phase portion is generated, for example, the working liquid in the liquid flow path is stably in contact with the inner wall surface of the wick having a large pore diameter, so that the working liquid smoothly penetrates the entire area of the wick. A liquid flow is obtained, so that the heat transport operation does not stop and the reliability of the heat transport operation is improved.

According to the present invention, the wick is configured such that the thermal conductivity on the radially outer side is larger than that on the radially inner side of the wick, so that the efficiency of heat transfer from the heat pipe container to the wick is improved. The heat flow (heat transfer) from the heat pipe container to the working liquid permeating the wick is performed stably, and the temperature difference between the heat pipe container and the wick generated in the evaporator and condenser is reduced, so the heat pipe This has the effect of increasing the thermal conductance of the substrate.

According to the present invention, since the wick is made of a porous material having elasticity, there is an effect that a heat pipe having high flexibility can be obtained.

According to the present invention, since the heat pipe is formed by forming the circumferential groove on the inner peripheral surface of the wick, the vapor phase portion is formed in the liquid flow path formed by the internal space of the wick due to liquid shortage or generation of bubbles. Even if it occurs, the working liquid flows through the circumferential groove on the inner peripheral surface of the wick by capillary action,
The working liquid can penetrate the entire wick efficiently from the circumferential groove, and the stable and ideal liquid flow can always be obtained, without stopping the heat transport operation.
Therefore, there is an effect that reliability in the heat transport operation is improved.

According to the present invention, since the heat pipe is formed by forming the circumferential minute groove at the tip of the groove on the inner wall surface of the heat pipe container, the contact side length between the wick and the groove of the heat pipe container is reduced. The heat conduction efficiency is improved by being longer due to the minute grooves, and the working liquid is easily evaporated in the evaporating section.Also, in the condensing section, the condensing area formed by the groove and the groove on the inner wall surface of the heat pipe container is the same as described above. Since the size is increased by the minute grooves, the temperature difference generated in the evaporating section and the condensing section is reduced, and the heat conductance of the heat pipe is increased.

According to the present invention, since the heat pipe is formed by forming the circumferential small groove at the tip of the groove on the outer peripheral surface of the wick, the contact side length between the heat pipe container and the groove of the wick is small. The groove lengthens the heat transfer efficiency, and the working liquid is easily evaporated in the evaporating section.Also, in the condensing section, the condensing area formed by the groove and the groove on the inner wall surface of the heat pipe container has the minute groove. Therefore, there is an effect that the temperature difference generated in the evaporating section and the condensing section is reduced, and the heat conductance of the heat pipe is increased.

[Brief description of the drawings]

FIG. 1A is a sectional view taken along an axial direction showing a heat pipe according to Embodiment 1 of the present invention, and FIG.
FIG. 3 is a cross-sectional view taken along line AA of FIG.

FIG. 2A is a sectional view taken along an axial direction showing a heat pipe according to Embodiment 2 of the present invention, and FIG.
It is sectional drawing along the BB line of FIG.

FIG. 3A is a sectional view taken along an axial direction showing a heat pipe according to Embodiment 3 of the present invention, and FIG.
FIG. 5 is a sectional view taken along the line CC of FIG.

FIG. 4 is a sectional perspective view showing a heat pipe according to Embodiment 4 of the present invention.

FIG. 5 is an axial sectional view of a heat pipe according to a fifth embodiment of the present invention.

FIG. 6A is a sectional view taken along an axial direction showing a heat pipe according to a sixth embodiment of the present invention, and FIG.
FIG. 4 is a cross-sectional view taken along line DD of FIG.

7A is a sectional view taken along an axial direction showing a heat pipe according to Embodiment 7 of the present invention, and FIG.
It is sectional drawing along the EE line of FIG.

FIG. 8A is a sectional view taken along an axial direction showing a heat pipe according to Embodiment 8 of the present invention, and FIG.
(C) is a cross-sectional view along line GG of (a).

9A is a cross-sectional view of a conventional heat pipe taken along an axial direction, and FIG. 9B is a cross-sectional view taken along line HH of FIG. 9A.

[Explanation of symbols]

Reference Signs List 1 heat pipe, 2 heat pipe container, 3 wick, 5 working liquid (working fluid), 6 steam (working fluid), 8 evaporator, 9 condenser, 10, 10a, 10
b, 12 grooves, 11, 11a, 11b, 13 grooves, 1
4, 17, 31a, 31b First wick (wick), 15, 18, 32 Second wick (wick), 16 circumferential grooves, 19, 20 minute grooves, 33a,
33b Third wick (wick).

Continued on the front page (72) Inventor Hisaaki Yamakage 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation (72) Inventor Atsushi Tsujimori 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Co., Ltd. In company

Claims (8)

[Claims] 1. A heat pipe container in which an evaporating unit and a condensing unit are set, a wick made of a tubular porous material inserted into the heat pipe container, and a working liquid penetrating the wick. In the heat pipe which evaporates the working liquid in the evaporating section, cools the vapor in the condensing section and circulates the working fluid in the heat pipe container, an axial direction formed on an inner wall surface of the heat pipe container. A heat pipe including a groove, a wick inserted into the heat pipe container such that an outer peripheral surface is in close contact with a groove tip of the groove, and a working liquid sealed inside the wick and permeating the wick. . 2. A heat pipe container in which an evaporating unit and a condensing unit are set, a wick made of a tubular porous material inserted into the heat pipe container, and a working liquid impregnated in the wick. In the heat pipe which evaporates the working liquid in the evaporator, cools the vapor in the condenser and circulates the working fluid in the heat pipe container, an axial groove formed on the outer peripheral surface of the wick, A heat pipe, comprising: a heat pipe container into which the wick is inserted such that a groove tip of the groove is in close contact with an inner wall surface; and a working liquid sealed in the wick and permeated into the wick. 3. The heat pipe according to claim 1, wherein the wick has a larger pore diameter on the inner side in the radial direction than on the outer side in the radial direction. 4. The heat pipe according to claim 1, wherein the heat conductivity of the wick is larger at a radially outer side than at a radially inner side. 5. The wick according to claim 1, wherein the wick is made of an elastic porous material.
The heat pipe according to any one of the above. 6. The heat pipe according to claim 1, wherein a circumferential groove is formed on an inner peripheral surface of the wick. 7. The heat pipe according to claim 1, wherein a fine groove in a circumferential direction is formed at a tip of a groove on an inner wall surface of the heat pipe container. 8. The heat pipe according to claim 2, wherein a minute groove in a circumferential direction is formed at a tip of a groove on an outer peripheral surface of the wick.