JPH0697147B2 - Loop type thin tube heat pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Purpose of the invention [Industrial field of application] The present invention relates to the structure of a heat pipe, and in particular, it greatly improves the reliability of a loop type thin pipe heat pipe and also improves its performance. It relates to a new structure for improvement.

[Prior Art] A conventional loop-type thin tube heat pipe is connected to each other at both ends of the thin tube as in one embodiment of US Pat. No. 4,921,041 and Japanese Patent Laid-Open No. 63-318493 shown in FIG. Check valve 2 at a predetermined part in closed loop type thin tube container 1
, A predetermined portion on the loop is configured as a heat receiving portion 1-H, and another predetermined portion is configured as a heat radiating portion 1-C, and a predetermined amount of gas-liquid two layers is formed in the loop type thin tube container. The working fluid of No. 1 was enclosed. The action of the check valve 2 played a decisive role in the operation of the loop type thin pipe heat pipe configured as described above. That is, the breathing action between the pressure chambers divided by the check valve and formed in the loop and the vibration of the valve element due to the pressure wave generated by the nucleate boiling of the working fluid in the heat receiving part, etc. The heat quantity is transported from the heat receiving section to the heat radiating section by causing the interaction with, strongly propelling the working wave, and circulating it in the loop. Also, as an example for ensuring the long-term life of the loop type thin pipe heat pipe, the check valve is a floating check valve, the valve body is a ruby sphere, and the valve seat is relatively soft. By adopting a valve seat made of copper, pure nickel, etc., it has been put into practice under normal use conditions to withstand continuous use for 15 years or more. Another feature of the conventional loop-type thin tube heat pipe is that it has a serpentine structure that repeats a large number of turns to provide a large number of heat receiving parts and a large number of heat radiating parts. It is possible to cancel the pressure loss in the thin tube caused by the circulation of the liquid each time it reaches the heat receiving part, restore the circulation propulsion force, and make the loop length infinitely long. It was possible to form a radiator in a wide range from 1 to 10KW. In addition, while normal heat pipes could not be used in top heat mode, loop type thin pipe heat pipes were not able to use the top heat mode in the head difference as long as the check valve could circulate the working fluid. Another major feature was the ease of heat transfer in.

[Problems to be Solved by the Invention] As described above, the loop type thin pipe heat pipe has many advantages over the conventional heat pipes, but it still has many problems to meet the demands of the industrial world. Among them, the problems to be solved by the present invention are as follows, which are caused by the check valve.

(A) It is difficult to guarantee long-term reliability of a check valve using a ruby ball valve and a 雖 for a large heat input at a high temperature.

An accident occurred in which a ruby shattered during a reliability test of a radiator that requires a shock input of 5 KW heat input at 300 ° C. As a countermeasure, I changed to tungsten carbide ball to deal with it, but since the specific gravity is as large as 13, the operation at low input deteriorated. In addition, floating operation became difficult due to excessive specific gravity, and opening and closing impact occurred during operation, causing concern about long-term reliability.

(B) In order to guarantee the long-term reliability of the check valve, there are restrictions on the choice of metal material for the thin tube container.

A high temperature circulating hydraulic fluid causes intergranular corrosion on the metal crystals on the inner wall surface of the metal thin tube container, and a large amount of metal powder is released and stays in the check valve. Found out. Regarding the measures, Japanese Patent Application No. 1-
No. 172915 (see Japanese Patent Laid-Open No. 3-39893).

(C) When using a floating check valve as described in U.S. Pat. No. 4,921,041 and JP-A-63-318493 to guarantee long-term reliability, the check force is weak due to leakage loss and the top heat The water level difference between the heat sink and radiator that can be used in the mode is 10
Limited to around 00mm.

As a countermeasure against this, if a check valve of a completely closed type in which a valve body is pressed by a spring is used, a violent shock vibration occurs due to a water hammer action, which makes it difficult to guarantee a long life.

(B) Structure of the invention [Means for solving the problem] In the novel loop-type thin tube heat pipe as a means for solving the problem, the circulation direction from the working liquid circulation flow path of the loop-type thin tube container is entirely changed. It is constructed by removing the regulation means. With regard to the embodiment of the conventional capillary heat pipe illustrated in FIG. 2, all of the check valve 2 is eliminated. Further, like the conventional loop type thin tube heat pipe, the heat receiving portion and the heat radiating portion are provided at at least one place respectively. The working fluid enclosed in the thin tube container is the same as the conventional type in that it circulates while closing the container at all positions in the loop, but this point is an essential condition in the loop type thin tube heat pipe of the present invention. . That is, the loop type thin tube heat pipe according to the present invention is constructed as follows as illustrated in FIG. At least one predetermined portion of the loop type thin tube container 1 is formed so that both ends of the thin tube are connected to each other so that the fluid can flow in a loop in the tube.
As H, at least one predetermined portion of the remaining portion is configured as a heat radiating portion 1-C, and most of them have heat receiving portions and heat radiating portions alternately arranged, and are loop type thin tube containers. 1, a predetermined amount of a predetermined two-phase condensable working fluid 4 which is less than the total internal volume is enclosed, and the inner wall diameter of the thin tube is such that the working fluid circulates or moves in a state where the working fluid is always closed. A structure characterized by having a diameter that is less than or equal to the maximum possible diameter. In FIG. 1, H and C indicate a heat receiving means and a heat radiating means, respectively.

In the structure, the predetermined amount of the sealed working fluid is less than the total inner volume of the thin tube container because the vapor phase volume necessary for nucleate boiling in the heat receiving section is required, and the inner wall of the thin tube operates. The liquid has such a diameter that it can circulate or move while being blocked, so that the liquid can move sensitively to the vapor pressure of nucleate boiling in the heat receiving part.

[Action] The action occurs and acts as follows.

(A) Generation of pressure wave and generation of axial vibration The nucleate boiling of the working fluid due to heat absorption in the heat receiving portion generates vapor bubble groups intermittently and rapidly in the heat receiving portion. Each vapor bubble is accompanied by a rapid expansion and, immediately thereafter, a slight rapid contraction due to adiabatic expansion cooling. This causes a pressure wave pulse to be generated in the working fluid, which pulse runs axially in the loop. The pulses collide on the opposite side of the loop, but they do not cancel each other because they are out of phase due to the compressibility of the working fluid containing compressed bubbles. When a plurality of heat receiving portions are provided in the loop, the pulses emitted from the respective heat receiving portions sometimes cancel each other and sometimes amplify each other, resulting in a stronger pulse. This pulse causes a strong axial vibration of the working fluid in the loop. The axial vibration of the working fluid thus generated is propagated in the loop through the compressed vapor bubbles contained in the working fluid and a part thereof.

A second vibration is further generated in the loop. It is caused by the intermittent expansion and contraction of synthetic bubbles created by a large number of vapor bubbles in which the working fluid in the pipes between adjacent heat receiving parts in multiple heat receiving parts is randomly generated in both heat receiving parts alternately or simultaneously. It is a back-and-forth movement by direct pressure and direct suction in the axial direction, and the propagation velocity is much slower than the pulse of the pressure wave generated earlier, but the amplitude is large and the vibration becomes stronger. Also, if a large number of heat receiving parts are provided in the loop, such vibrations generated from all of them will be partially attenuated by mutual interference but the other part will be amplified, greatly amplifying as a whole. It becomes a stronger vibration.

(B) Generation of Circulating Flow of Working Fluid The fact that the working fluid 4 is alternately distributed with its vapor bubbles 5 as shown in FIG. 1 means that the pulse groups and fluids of the pressure wave propagating in the working fluid as described above. It is essential to give compressibility to the working fluid in order to prevent the group of vibrations and the like caused by the axial back and forth movement from disappearing due to interference. It is also necessary to reduce the pressure loss of the fluid and facilitate the generation of vibration. It is also essential in order to improve the temperature dependence of the heat transfer capacity described later. In order to alternately distribute the vapor bubbles 5 and the working fluid 4 as described above, it is necessary to sequentially convey the vapor bubbles from the heat receiving portion as the working fluid becomes a circulating flow. A circulating flow in a loop type thin pipe heat pipe without a check valve is generated as follows.

The pressure of vapor bubbles generated in the heat receiving section is reduced and reduced in the heat radiating section. Therefore, when the loop type thin pipe heat pipe as shown in FIG. 1 is horizontally arranged on the plane, the working fluid receives the heat receiving portion 1.
The working fluid 4 in the loop circulates in the direction of the arrow, flowing from -H to the closest heat radiating section 1-C.

The loop-type thin tube heat pipe shown in FIG.
In the case of bottom heat with -H as the bottom and the connection container 1-2 held vertically, the bubble group 5 generated in the heat receiving part 1-H is most likely to rise and the resistance is low.
-2, the working fluid 4 that has risen through −2 and most of the bubbles have been condensed moves down the meandering portion with the help of gravity. That is, it circulates in the direction of the dashed arrow. That is, the working fluid 4 naturally circulates in the direction in which the assistance of gravity is easily obtained.

The working fluid in the loop-type thin tube heat pipe naturally selects and circulates in the direction having the least resistance at the time of operation, and does not become stagnant.

(C) Transport of heat quantity Due to the interaction of the above-mentioned (a) and (b), the working fluid 4 in the loop generates axial vibration corresponding to the heat quantity given to the heat receiving section 1-H, whereby the heat receiving section 1-H The amount of heat is transported toward the heat dissipation part.

It has long been said that the pipe exhibits a heat-transporting function due to the axial vibration of the working fluid enclosed in the pipe, but this has been confirmed by experiments and theoretically elucidated as Japanese Patent Publication No. 2 There is a publication of -35239. The publication describes in detail the principle of heat transfer by axial vibration of the working fluid,
The operation of the loop type thin tube heat pipe according to the present invention is considered to be completely the same in principle. The present invention has been invented on the assumption that axial vibration of the working fluid in the pipe is an effective means of heat transfer, and there is no intention to discuss the principle thereof. However, the simplest way to express the principle in another way is as follows. "A part of this heat transport device is considered by dividing the amplitude of axial vibration into one unit, and when the fluid vibrates within this unit length, it vibrates between the inner surface of the pipe wall and the vibrating fluid. An extremely thin boundary layer of a good fluid can be created.If there is a temperature difference at both ends of the unit length of the fluid, the instantaneous temperature difference between the boundary layer and the inner wall surface of the pipe is transmitted as it is by heat conduction, However, at the next moment, due to vibration, the relative position of the low temperature part of the fluid changes to the high temperature part of the boundary layer and the inner surface of the pipe, and the low temperature part changes to the high temperature part, and the high temperature part of the boundary layer transfers heat to the fluid. The low temperature part absorbs the amount of heat from the fluid, and the exchange of such amount of heat is violently repeated by the vibration of the fluid, so that the boundary layer and the inner surface of the pipe are used as a heat medium in the fluid, and a soaking action is intensely generated. The total length of the pipe of the heat transport device is an innumerable collection of heat equalizers of such unit length. Since it is considered to be a body, the heat transport pipe exerts the function of equalizing the temperature of the working fluid over the entire length, which is similar to the function of the heat pipe for transporting the amount of heat by the soaking action, It becomes an effective means of heat transport. ”(D) Temperature dependence of the heat transport capacity of the heat-receiving part In order for the heat transport means to work effectively, it is necessary to have temperature dependence in which the heat transport capacity increases according to the magnitude of the heat input. Is. In the loop-type thin tube heat pipe according to the present invention, nucleate boiling becomes intense in response to heat input to the heat receiving section, and heat transfer capacity becomes active in response to input. Also, the vapor bubbles that are alternately distributed with the working fluid and circulate in the loop type thin tube container are compressed according to the rise of the saturated vapor pressure of the working fluid due to the temperature rise of the heat receiving part, and have the ability to propagate pressure wave pulse and fluid vibration. Rise,
The temperature dependence of the heat transfer capacity of the heat receiving part is made good.

With the above-described operation, the loop type thin pipe heat pipe according to the present invention can transport the amount of heat from the heat receiving portion to the heat radiating portion despite the elimination of the check valve. Since the principle of heat transport is heat transport due to axial vibration of the working fluid, it is desirable to suppress vibrations due to pressure wave pulses and vibrations due to axial reciprocation as little as possible. Therefore, the smoother the inner wall surface of the loop type thin tube container, the smaller the attenuation can be. There are various methods for smoothing the inside of the thin tube, but polishing by chemical means is often adopted.

The next thing to note in order to reduce the damping is the material of the capillaries. Since vibration is regarded as internal pressure fluctuation, it is necessary to avoid materials that absorb internal pressure fluctuation due to elastic deformation. Further, since a large internal pressure is applied to the inside of the pipe due to the occurrence of vibration and the internal pressure load is a severe repeated load, it is necessary to avoid a material having a small yield strength and poor creep resistance. However, since the heat radiation unit is a heat exchange unit, it is often the case that a material such as copper or aluminum that is not desirable from the above viewpoint is used. Therefore, at least the heat insulating part that connects the heat receiving part and the heat radiating part is formed using a thin tube that is sufficiently thick compared to the heat receiving part, or is formed of a metal material with a large Young's modulus and good creep resistance. It is desirable to have been done.

Since the basis of heat transport is the soaking action that occurs in the boundary layer and the inner surface of the thin tube, heat radiation from the outer surface of the thin tube container may significantly deteriorate the heat transport efficiency. Therefore, it is desirable that the connecting portion (heat insulating portion) between the heat receiving and radiating portions of the loop type thin tube container is sufficiently covered with a heat insulating material.

Further, since the above-mentioned soaking action is mainly performed by heat conduction, it is desirable that the working fluid has a high heat conductivity. That is, by using the liquid metal as the working fluid, the performance of the loop type thin tube heat pipe according to the present invention can be greatly improved.

Since the loop type thin pipe heat pipe according to the present invention utilizes heat transfer by axial vibration of the working fluid, the heat transfer according to Japanese Patent Publication No. 2-35239, which is commonly called a dream pipe in the basic principle of heat transfer. Similar to the device. However, the structure of the device, the mechanism of vibration generation of the working fluid, and the like are completely different, and it is a completely novel heat transfer device. Also, the basis of the present invention is rather US Pat.
It is in the loop type thin tube heat pipe according to the specification of 041 and JP-A-63-318493, and is constituted by removing the flow direction regulating means (check valve) which is a component thereof. Therefore, U.S. Pat.
Almost all of the embodiments described in the specification of Japanese Unexamined Patent Publication No. 318493 can be directly applied as the embodiments of the loop-type thin tube heat pipe according to the present invention. Further, all of several dozen application patents filed after that, which are disclosed in JP-A-63-318493, can be applied as they are as application patents for the loop type thin human pipe according to the present invention.

The difference between the heat transfer device according to Japanese Patent Publication No. 2-35239 and the loop type thin pipe human pipe according to the present invention will be described below, and the loop type thin pipe heat pipe according to the present invention and U.S. Pat. The difference of Japanese Patent No. 63-318493 will be described to explain that the loop type thin tube heat pipe of the present invention is a completely novel loop type thin tube heat pipe.

In the heat conduction device of Japanese Patent Publication No. 2-35239, at least one pair of fluid reservoirs and at least one of them are connected as essential constituents consistently in the basic claims and in all the embodiments. It has been explained as a precondition that the four components of the pipe line, the heat transfer fluid filling the pipe line and the reservoir, and the axial vibration generating means are provided side by side, and the description of the specification also describes that. It is described as follows. That is, it is clear that even if any one of the four components is lacking, the heat transfer device cannot operate and the patent is not valid.

On the other hand, the loop-type thin tube heat pipe according to the present invention is composed only of the loop-type thin tube container and the working fluid in an amount that does not fill the internal volume thereof, and does not require any fluid reservoir of Such an oscillating means for mechanically, electrically, or using an external force for generating axial vibration is not attached at all.

The difference between the two and the novelty of the present invention are clear only by the above comparison, but a more decisive difference lies in the structure of the working fluid and its behavior. In Japanese Examined Patent Publication No. 2-35239, the specification describes in detail that the heat transfer device is completely different from the heat pipe, and the loop type thin pipe heat pipe according to the present invention is a kind of heat pipe. It is clear that the difference between the two is clear. As described in the specification of Japanese Patent Publication No. 2-35239, the working fluid is not used in a gas-liquid two-phase state even when a condensable fluid is used, and is incompressible in a liquid phase state. Is used. On the other hand, since the loop type thin pipe heat pipe of the present invention is a heat pipe, it is always used in a gas-liquid two-phase state and operates by utilizing the compressibility of the gas-liquid two-phase fluid.

Further, the heat transfer device of Japanese Patent Publication No. 2-35239 is characterized in that the working fluid only vibrates in the axial direction at a predetermined position and does not involve any mass transfer, but the loop type of the present invention. The capillary heat pipe is basically a heat transfer device in which the working fluid circulates though it is not essential that the working fluid circulates in the loop. Further, the decisive difference between the two heat transfer devices is the mechanism of the axial vibration of the hydraulic fluid. In Japanese Patent Publication No. 2-35239, the hydraulic fluid is forcibly vibrated by a powerful vibration generating means. This violent vibration of the vibration generating means gives vibrations to unnecessary parts and causes mechanical wear to the parts subject to vibration and also to the vibration generating means itself, which is reliable for continuous use for many years. There is a lack of sex. Further, in order to transport the amount of heat, a large amount of additional energy is consumed to operate the vibration generating means.

On the other hand, the vibration of the working fluid of the loop type thin pipe heat pipe according to the present invention does not require any external mechanical vibration, and the working fluid itself becomes a source of axial vibration. Is done by. That is, vibration is generated by the impact of the nucleate boiling of the working fluid, and this nucleate boiling is generated by absorbing the heat energy of the heat receiving portion, and the working fluid is generated by the nucleate boiling that naturally occurs in one process of heat quantity transportation. Since it oscillates by itself, it is not necessary to use any mechanical or electrical external vibrations, and no additional energy is consumed for oscillation. Also, without giving vibration to the outside,
Since it does not have any consumable parts as a vibration generating means, there is no concern about its life even during continuous use for many years.

From the above description, the heat transfer device according to Japanese Patent Publication No. 2-35239 and the loop type thin pipe heat pipe according to the present invention are heat transport means of completely different types, and the idea of the invention is obviously different. Can say

Next, U.S. Pat.No. 4,921,041 and JP-A-63-318493.
The loop-type thin tube heat pipe according to the publication is compared with the loop-type thin tube heat pipe according to the present invention. Both are common in that they operate by the temperature difference between the nucleate boiling generated in the heat receiving part and the heat receiving and radiating part, and it is composed of a long loop type thin tube container, and the former embodiment and applied patent are almost the latter. It is very similar in that it can be applied as it is. However, it can be said that it is a completely different type of loop-type capillary heat pipe in that its operating principle is completely different. The former loop-type thin tube container is divided into multiple pressure chambers by a check valve, and a breathing action occurs between the pressure chambers due to the interaction between the temperature difference between the heat receiving and radiating parts and the boiling of the working fluid in the heat receiving parts. Hydraulic fluid circulates. Further, the pulse vibration of the pressure liquid generated by the nucleate boiling generated in the heat receiving part is absorbed by the ball valve of the check valve and converted into the vibration of the check valve, and the vibration of the check valve further applies the circulation propulsive force to the working fluid. Give. The heat quantity is carried by the circulation of the working fluid in the loop thus generated in the former case. In the latter, the check valve is completely abolished, so the circulation is not strong, it only flows naturally in the direction of low resistance, and it makes a small contribution to heat transfer. As described above, the heat transfer is performed by the axial vibration of the working fluid generated by nucleate boiling.

In other words, even if the appearance and usage are the same, there is a very important structural difference, such as the presence or absence of a check valve. Furthermore, the double-loop thin tube heat pipe that completely differs in the principle of heat transport is a completely different loop type. It can be said that it is a thin tube heat pipe.

[Example] First Example A loop type thin tube container 1 having a large number of turns repeated as shown in Fig. 3 was formed by connecting both ends of a long thin tube having an outer diameter of 3 mm and an inner diameter of 2.4 mm. As the heat receiving means H, a central part of the meandering is sandwiched by pure copper heat receiving plates and heated from both sides by a heater (not shown). The width 1 of the heat receiving plate was 100 mm. The length L of one turn of the meander was 460 mm. Therefore, the length of the heat receiving portion 1-H is 100 mm, and the remaining 360 mm is forcibly cooled with a wind of 4 m / s to form the heat radiating portion 1-C. The number of meandering turns was 80. Three non-return valves are attached to such a loop type thin tube container 1 and CFC HCFC-142b is used as a working fluid in an internal volume of 40%.
% And US Pat. No. 4,921,041 and JP-A-63
No. 318493 discloses a loop type thin tube according to the present invention, which comprises the loop type thin tube heat pipe, does not have a check valve at all as shown in FIG. 3, and contains Freon HCFC142b as a working fluid in 70% of the internal volume. A heat pipe was constructed and the heat radiation performance of both was compared. The measurement posture in the measurement wind tunnel was such that the straight pipe portion of each turn was held horizontally and the heat receiving plate was held vertically as shown in the figure. For the measurement performance, the temperature difference between the equilibrium temperature corresponding to each heat input of the surface temperature of the heat receiving part container 1-H sandwiched between the heat receiving plates and the inlet temperature (ambient temperature) of the cooling air is Δt ° C, and this is The numerator was used and the heat input was used as the denominator, and the thermal resistance value R (° C / W) was used for comparison. The results are as shown in the following table and there is no difference between the two, demonstrating that the loop-type thin tube heat pipe according to the present invention has a heat transfer capacity comparable to that of the loop-type thin tube heat pipe with a check valve.

Next, with a heat input of 1000 W, the temperature was 72.3 ° C, the thermal resistance was 0.047 ° C / W, and one tube of the thin tube container was crushed (around 90% crushed) in a flat state, making it difficult to circulate the working fluid. The normal temperature of the heat receiving part increased by 1.7 ℃ and the thermal resistance was 0.049 ℃ / W
And a little worse. Further, the same portion was completely crushed and the circulation of the working fluid was completely stopped. The equilibrium temperature of the heat receiving part further increased by 1 ° C (2.7 ° C in total), and the thermal resistance value became 0.05 ° C / W. This indicates that the circulation of the working fluid was a slight contribution of 2.7 ° C in temperature and 0.003 ° C / W in thermal resistance value, and the circulation speed was very slow. Further, it is shown that the loop type thin tube heat pipe of the present invention actively transfers heat even when the working fluid is in a stopped state, and the working fluid is more active in compressibility due to the effect of vapor bubbles distributed in the flow path. Shows that the axial vibration continues, and that the heat transfer function by the axial vibration is very good. The status of this experiment is shown in the transcript of the measurement record in FIG. The vertical axis of the figure shows the temperature and the horizontal axis shows the passage of time. Lines 1 and 2 (overlapping lines) are the temperature rise curves of the heat receiving part at a heat input of 1 KW, lines 3 and 4 are the temperature rise curves of the surface temperature near and far from the heat receiving part of the heat dissipation container, and line 5 is The inlet air temperature (ambient temperature) line 6 of the cooling wind tunnel shows the air temperature at the outlet of the wind tunnel. Point P-1 indicates the first half-crushing time of the thin tube container, point P-2 indicates the second complete-crushing time, and the temperature rise starts immediately after that. The temperature fluctuations of curves 3 and 4 represent the axial vibration of the working fluid in the capillary. The vibration in the working fluid circulation indicated by v-1 has a small amplitude because the vibration is absorbed by the circulating flow, the amplitude becomes large near v-2 where the flow velocity is slow, and the frequency near v-3 when the circulation is stopped, Both amplitudes are active. The curves 3 and 4 slow the circulation flow velocity due to the collapse of the thin tube container, and at the same time the temperature drops due to the effect of the cooling air.When the circulation flow is completely stopped, the heat exchange at the tube wall of the thin tube container becomes active and the temperature rises slightly. Shows.

Second Example A long thin tube with an outer diameter of 1 mm and an inner diameter of 0.7 mm is formed into an elliptical spiral shape with a long diameter of 38 mm and a short diameter of 18 mm, and the number of turns is 45 turns. I made two containers. An aluminum heat sink with a fin height of 13 mm and a heat receiving bottom surface of 50 mm x 50 mm having two grooves with a radius of 9 mm was prepared. As shown in FIG. 5, the two ends of the spiral meandering loop type thin tube container were soldered to the groove of the heat sink to form a radiator. In the figure, the thin tube container is shown in a diagram for simplicity. In the figure, HS is a heat sink for heat reception, 1-H, 1-H-2 is a heat receiving section, 1-C-1,1-
C-2 is a heat radiating portion, and an arrow C is a cooling wind of the cooling means.
A check valve is attached to both containers of the radiator, and a two-phase working fluid is enclosed in 40% of the internal volume of each container, and the loop type thin pipe heat pipe described in US Pat. No. 4,921,041 and JP-A-63-318493 is disclosed. Was constructed and its performance was measured. After that, the check valves of the respective containers are removed and then sealed again, and 80% of the inner volume of the two-phase working fluid is enclosed in each container to construct the loop type thin pipe heat pipe according to the present invention as shown in FIG. The performance was measured. The measurement wind speeds were all 3 m / s, and the measurement modes were bottom heat mode and top heat mode. The measurement result shows that the performance of the loop-type thin tube heat pipe according to the present invention is superior in any measurement mode, and the performance of the former is lower in the top heat mode, whereas the loop-type thin tube heat pipe according to the present invention is lower. The performance of the top heat mode of the above was no different from the performance of the bottom heat mode. Furthermore, the dependence of the heat transport capacity on the heat receiving part temperature for each heat input was also good. The following table shows the measured data.

Third Embodiment Loop type thin tube heat pipe according to the present invention and US Pat. No. 4,92.
1,041 and JP-A-63-318493 are different types of loop-type heat pipes having completely different operating principles from the loop-type heat pipes described in JP-A-63-318493, but the external structures are exactly the same, and the embodiments are almost the same. Is. However, when making effective use of these features, the former and the latter have their respective superior and inferior points, and it may be difficult to judge which one should be applied. Therefore, when applying these, after the production is completed or at the time of design completion, from the former to the latter,
Or, it is considered that there is a high frequency that the latter needs to be modified, changed, or switched to the former.

A major feature of the loop-type thin tube heat pipe is that the working fluid can be sealed and the amount of the sealed fluid can be easily adjusted even after the application product is completed or at the installation site of the application product.
Further, when changing from the former to the latter, it suffices to mount a check valve, and when switching from the latter to the former, it is only necessary to remove the check valve. Since the operation of cutting and connecting the thin tube container is easy, the work of attaching and removing the check valve as described above can be easily performed. If such attachment / removal work is expected, as shown in FIG. 6, the check valve on the thin tube container is to be removed or attached at a predetermined distance, and cut at a predetermined distance. 11-2,12 on terminal
-1 flare joint, or the female side or the male side of the auto coupling is attached respectively, and the flare joint or the auto coupling of the female side or the male side corresponding to the female side or the male side is separately provided at both ends. Prepare two connecting thin tube containers to which 11-1 and 12-2 are mounted, and one of these two connecting containers is a connecting thin tube container 9 for mere length adjustment,
If the other one is two types of connection thin tube container 10 with a check valve 2-1 to which a check valve 2-1 is adhered, the check valve 2 can be replaced by exchanging them. 1 can be configured as a loop type thin tube heat pipe 1 which is detachable. As a result, the former loop type thin tube heat pipe and the latter loop type thin tube heat pipe can be freely modified, changed or switched. In this case, particularly when changing from the latter to the former which is the loop type thin pipe heat pipe according to the present invention, fine adjustment of the amount of the enclosed liquid is almost unnecessary, and therefore it can be performed very easily. In the loop type thin pipe heat pipe according to the present invention, this is 65% of the full internal volume.
This is because even if the liquid volume is enclosed in a wide adjustment range such as% -95%, the pressure wave and the vibration wave are almost unchanged and propagate well. By carrying out in this manner, the loop type thin tube heat pipe according to the present invention is equipped with a check valve, and the check valve is changed from the conventional loop type thin tube heat pipe in which the working fluid circulates in the loop to carry the quantity. It can be removed or the check valve can be omitted.

C. Effect of the Invention While the conventional loop type thin tube heat pipe was inevitable to use the vibration mechanism such as the check valve, it was impossible to completely guarantee the long-term service life. The loop-type thin tube heat pipe according to
Since all of the consumable parts inside the thin tube and the auxiliary mechanism parts outside the thin tube are abolished, all the points of concern regarding the life guarantee have been resolved. Therefore, it can be said that the loop type thin pipe heat pipe according to the present invention is a highly reliable heat pipe which is almost perfect.

Also, in the conventional loop-type thin tube heat pipe, the performance of the check valve varied due to manufacturing errors, so an intermediate inspection at the time of manufacturing was indispensable, and an airtightness inspection after mounting the check valve was unavoidable. The loop-type capillary heat pipe according to the invention is completely free from these problems. It is considered that the improvement of reliability from this point is also a very large effect.

The loop type thin tube heat pipe according to the present invention has an extremely simple structure that cannot be further simplified, requires no new manufacturing equipment at all, and immediately shifts to industrial production for mass production. You can

The loop type thin tube heat pipe according to the present invention can be directly applied to all the embodiments of the conventional loop type thin tube heat pipe using a check valve. Moreover, it is impossible to change, improve, or switch from the conventional thin tube heat pipe to the loop thin tube heat pipe according to the present invention simply by removing the check valve and refilling the working fluid, so the conventional loop thin tube heat pipe is applied. For many applied devices already manufactured, the loop type thin tube heat pipe according to the present invention can be easily improved and switched, and the check valve can be removed to improve its reliability.

As described above, it is considered that the loop type thin tube heat pipe according to the present invention has great technical and industrial contribution to the industry and applied equipment industry.

[Brief description of drawings]

FIG. 1 is a schematic partial cross-sectional view showing the structure of a loop type thin tube heat pipe according to the present invention. FIG. 2 is a schematic partial cross-sectional view showing the structure of a conventional loop type thin tube heat pipe. FIG. 3 First of loop type thin tube heat pipe according to the present invention
The top view which shows an Example. FIG. 4 is a measurement record diagram showing a part of the operating state of the loop type thin tube heat pipe of the first embodiment, and is a temperature rise curve diagram of each part corresponding to heat input. FIG. 5 Second of loop type thin tube heat pipe according to the present invention
1 is a schematic perspective view showing an embodiment. FIGS. 6 (a) and 6 (b) are plan views showing the configuration of a third embodiment of the loop type thin tube heat pipe according to the present invention. 1 ... Loop type thin tube container 1-H ... Heat receiving part 1-C ... Radiating part H ... Heat receiving means C ... Cooling means 2 ... Circulation direction regulating means 2-1 ... Check valve 4 ... Actuation Fluid 5 …… Steam bubble 6 …… Steam generation chamber 7 …… Internal pressure tube 9 …… Connecting thin tube container 10 …… Connecting thin tube container with check valve 11 …… Flare joint or auto coupling

Claims (7)

[Claims] 1. A loop-type thin tube container in which both ends of the thin tube are connected to each other so as to be freely flowable to form a closed container, and at least one predetermined portion is a heat receiving portion,
At least one predetermined part of the remaining thin tube container is configured as a heat radiating part, and most of them have heat receiving parts and heat radiating parts arranged alternately, and the whole contents are contained in the loop type thin tube container. The product contains a predetermined amount of a predetermined two-phase condensable working fluid that is less than the product, and the inner wall diameter of the thin tube is less than or equal to the maximum diameter at which the predetermined working fluid can circulate or move while the tube is always closed. Loop type thin tube heat pipe characterized by having a diameter of. 2. Most of the loop type thin tube container is formed by bending into a multi-turn spiral shape or a multi-turn meandering shape, and most of the heat receiving portion and most of the heat radiating portion are spiral or meandering. The loop type thin pipe heat pipe according to claim 1, wherein the loop type thin pipe heat pipe is provided at a predetermined position for each turn. 3. The loop type thin tube heat pipe according to claim 1, wherein the inner wall surface of the loop type thin tube container is ground as smooth as possible. 4. A heat insulating portion connecting a heat receiving portion and a heat radiating portion in a loop type thin tube container is formed by using a thin tube having a sufficiently thick thickness as compared with the heat radiating portion, or has a large Young's modulus and is resistant to creep. The loop type thin pipe heat pipe according to claim 1, which is formed of a metal having good properties. 5. The loop type thin tube heat pipe according to claim 1, wherein an intermediate portion connecting the heat receiving section and the heat radiating section of the loop type thin tube container is covered with a heat insulating material. 6. The loop type thin pipe heat pipe according to claim 1, wherein the two-phase condensable hydraulic fluid is a fluid metal. 7. A loop type thin tube container in which a circulation direction regulating means for regulating the circulation direction of a working fluid is arranged at a predetermined portion in a closed loop type thin tube container in which both ends of the thin tube are connected to each other. Is configured as a heat receiving portion and another predetermined portion is configured as a heat radiating portion, and a predetermined amount of gas-liquid two-phase working fluid is enclosed in the loop type thin tube container, and the working fluid circulates. The nucleate boiling generated in the direction control means and the heat receiving part and the temperature difference between the heat receiving and radiating part interact with each other to circulate in a predetermined direction in the loop type thin tube container to perform heat exchange between the heat receiving part and the heat radiating part. The loop type thin pipe heat pipe according to claim 1, wherein the circulation direction regulating means of the loop type thin tube heat pipe is removed or the circulation direction regulating means is omitted.