JP3158267B2 - Loop type meandering thin tube heat pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pipe structure, and more particularly to a loop type meandering thin tube having a novel structure provided with additional means effective for expanding the range of application of the meandering heat pipe and improving its function. Related to heat pipes.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 6-3354 (loop-type thin-tube heat pipe), Japanese Patent Application Laid-Open No. 4-190090 (loop-type thin-tube heat pipe), Japanese Patent Application Laid-Open No. 4-251189 (micro-heat pipe), and Japanese Patent Application No. Hei 5-5 Various application products of the meandering thin-tube heat pipe represented by four interrelated pending patent applications of 241918 (plate-type heat pipe) can be conventionally achieved by enabling weight reduction and high performance. The scope of its application is expanding as a cooling means in a new field that did not exist.

The basic structure of the above-mentioned loop-type meandering thin tube heat pipe as an operating principle is disclosed in Japanese Patent Application Laid-Open No. 4-1.
No. 90090, the structure of which is shown in FIG. In the figures, the capillaries are shown diagrammatically for simplicity. In FIG. 2, the inner diameter of the metal thin tube, which is a constituent material, is such that the working fluid 3 sealed therein always fills and closes the inside of the tube due to the condensing force generated by the surface tension, even if the sealed amount is very small. In other words, the inner diameter is sufficiently reduced so that the inside of the tube is moved irrespective of the holding posture of the thin tube, and such a long thin tube is disposed at a predetermined position. Between the means H and the cooling means C arranged at a predetermined position, the heating means H absorbs the amount of heat and reverses the heat. The heat is released and the heat is reversed to the heating means H via the heat insulating portion A, and the reversal meandering is repeated many times, so that the heat receiving portion 1-H and the heat insulating portion 1-A are respectively obtained.
And a heat-radiating portion 1-C, which is formed as a meandering thin tube which is a meandering series connection of a number of unit metal thin tubes 1-1,
A loop-shaped meandering thin tube 1 in which the long and short ends of the meandering thin tube are connected in a freely and air-tightly loop-like manner by a predetermined means is applied as a closed container for a heat pipe,
A structure in which a predetermined amount of a predetermined two-phase condensable working fluid is sealed in a state in which the inside of the closed container is evacuated to a high vacuum to form a loop-shaped meandering thin tube heat pipe.

[0004] The loop-shaped meandering thin-tube heat pipe thus configured is in a state as shown in FIG. 3 when it stops operating and is in a storage state or an operation state. Even though it is in the preservation state, the meandering thin tube heat pipe continues to operate while being inactive due to the ambient temperature, and the working fluid 3
A group of steam bubbles 3-1 is generated, and the inside of the container is steam bubbles 3-
1 and the group of droplets 3-2. That is, a group of the vapor bubbles 3-1 generated by each boiling in the large number of heat receiving portions 1-H of the loop-shaped meandering thin tube heat pipe move by themselves in the narrow tube and are dispersed in all the containers of the loop-shaped meandering thin tube 1 to generate steam. A group of bubbles 3-1 and a group of droplets 3-2 are alternately arranged. Each vapor bubble 3-1 has a saturated vapor pressure corresponding to the temperature of the heat receiving unit 1-H, and is in a state of expanding and contracting in response to the nucleate boiling pressure wave generated in the heat receiving unit 1-H. . Further, the steam bubbles 3-1 are gradually condensed and reduced in the heat radiating section 1-C, and are sequentially propelled by the new and high-pressure steam bubbles 3-1 which are sequentially generated, and are sequentially moved from the heat receiving section 1-H to the heat radiating section 1C. Move slowly toward the tip of -C. The nuclear vapor bubble 3-1 condenses while moving, and its volume changes. The nuclear vapor bubble 3-1 has the maximum volume in the heat receiving unit 1-H, and has the minimum volume at the final end of the heat radiation unit 1-C. Therefore, the distribution state of the working fluid 3 in the thin tube is gas-phase rich in the heat receiving portion 1-H and the heat radiating portion 1-C
At which the liquid phase becomes rich.

[0005] A group of predetermined portions of the group of unit metal thin tubes 1-1 of the loop-shaped meandering thin-tube heat pipe thus configured is referred to as a group of heat receiving portions 1-H. If a predetermined group of the remaining groups is made into a group of the heat radiating portions 1-C and the heat is radiated by the cooling means C, the meandering thin tube heat pipe is unprecedented to the conventional heat pipe. It becomes a unique operating condition. The operating state is as follows. In all the unit thin metal tubes 1-1 constituting the loop-shaped meandering thin tube heat pipe, the working fluid 3 in all the heat receiving portions 1-H is brought into a nucleate boiling state due to heat absorption and intermittent high-pressure steam Groups of bubbles 3-1 are generated sequentially. The intermittent phenomenon of the steam bubbles 3-1 occurs by causing an instantaneous temperature drop in the heat receiving portion 1-H due to rapid adiabatic expansion of the steam bubbles 3-1. The intermittent generation of the high-pressure steam bubbles 3-1 generates a strong pressure wave in the working fluid 3 in each unit metal thin tube 1-1. This group of pressure waves propagates in the working fluid in all loops of the capillary container in both forward and reverse directions and runs around, not only in each unit capillary tube 1-1, but collides with each other in all loops and promotes each other. The vibrations of expansion and contraction are generated in the gas-phase working fluid (bubbles 3-1) in the full-capillary container by combining or canceling each other. This vibration causes intense axial vibrations in the gas-phase working liquid (bubbles 3-1) and the liquid-phase working liquid (droplets 3-2) in the full capillary container. The intensity of the vibration energy depends exactly on the intensity of the energy applied to the heat receiving portion 1-H and the magnitude of the temperature difference between the heat receiving portion 1-H and the heat radiating portion 1-C. In the meantime, in the loop type meandering thin tube heat pipe, the holding posture during operation, the distance between the heat receiving portion 1-H and the heat radiating portion 1-C in the loop, and the imbalance of the ambient temperature on the loop. As a result, an imbalance in the internal pressure occurs in the container, so that the working fluid as a whole gently circulates in the direction of less resistance in the loop.

[0006] The axial vibration of the gas-phase working liquid and the liquid-phase working liquid causes a strong heat transport function to be generated in the loop-shaped meandering thin-tube heat pipe, and the amount of heat is transferred from the heat receiving section 1-H to the heat radiating section 1-C. Actively transported. The heat transfer at this time is performed by the vibration of the working fluid and the mediation of the boundary layer of the flow of the working fluid 3 which is formed on the inner wall surface of the loop-shaped meandering thin-tube container by itself. A description of the basic principle that the axial vibration of the hydraulic fluid 3 efficiently transports heat as described above is described in the invention of the University of Florida called the Dream Pipe, Japanese Patent Publication No. 2-35.
No. 239 and detailed description in the attached document, so that the description thereof will be omitted.

The heat transfer capability of such a loop-shaped meandering thin-tube heat pipe is extremely strong, and its performance is hardly affected by gravity unlike a conventional heat pipe. It performs various functions. In particular, in the field of radiators for various equipment, the performance does not deteriorate in any application posture, that is, the unique characteristics of meandering thin tube heat pipes, such as exhibiting good heat transport performance even in top heat mode, and cannot be manufactured with conventional technology The function that enables the construction of a thin plate heat pipe with a thickness of 2 mm or less, etc., has attracted widespread industry attention as greatly expanding the degree of freedom in equipment design compared to conventional heat pipes. It is getting.

Furthermore, the structure consisting of a thin tube with an outer diameter of 5 mm or less not only allows the tube to be bent freely and can be applied, but also the excellent forced convection heat transfer coefficient of the thin tube allows the forced convection heat transfer without attaching a fin group. It is possible to form a convection heat radiating part, and it has a volume ratio of 1/2 and a weight ratio of 1/2 compared to a conventional heat radiator to which a heat pipe is applied.
3 has excellent advantages such as enabling the construction of a small and light-weighted device radiator, and the market is expanding.

However, the recent development of semiconductor application technology has been remarkable, and the demand for cooling technology in the industry due to it has become more and more severe. Therefore, in addition to further reduction in size and weight, higher functionality and higher capacity are desired. It is getting. The present invention is an application of the above-mentioned four pending patents, and aims to meet the needs of the industry by further improving the function of the loop-type meandering thin-tube heat pipe according to the pending patents already commercialized. I have.

[0010]

Despite its excellent small size, light weight and high performance, the loop type meandering thin tube heat pipe has the following problems. (1) In the case of a loop-shaped meandering thin-tube heat pipe in which the distance between the heat receiving portion 1-H and the heat radiating portion 1-C is several meters or more, the pressure loss in the thin tube is increased. The pressure wave of the nucleate boiling of the hydraulic fluid, which is the source of the axial vibration of the hydraulic fluid 3, is attenuated, and thus the axial vibration is also attenuated.
This has inevitably reduced the heat transport capacity.

(2) In the case of a loop-shaped meandering thin tube heat pipe used for top heat with a large head difference, such as a head difference of several meters or more, the pressure in the gravitational direction due to the head difference of the working fluid in the tube increases and the length becomes longer. Due to the increase in pressure, the pressure loss in the pipe increases, which makes it difficult to vibrate the working fluid, which is a source of heat transfer capability, in the axial direction, and inevitably lowers the heat transfer capability.

(3) The length of the heat radiating portion 1-C is too long compared to the length of the heat receiving portion 1-H, or the heat radiating portion 1-C
When the forced convection for cooling is too low, or when the length of the heat receiving portion 1-H is too short, or the amount of heat received is too small and the amount of steam generated by nucleate boiling is insufficient, the radiating portion Since most of the working fluid vapor bubbles 3-1 in 1-C condense and disappear, most of the working fluid 3 in the radiating unit 1-C becomes a liquid phase, and Due to the loss of much of the compressibility of the hydraulic fluid 3 and the increase in pressure loss in the pipe in the heat radiating section 1-C, it is difficult to vibrate the hydraulic fluid 3 which is the source of heat transport capability in the axial direction And the heat transport capacity was sometimes reduced.

(4) In the elongated loop type meandering thin tube heat pipe, a plurality of heat receiving portions 1-C are provided for one heat radiating portion 1-C.
In the case where H is arranged in series with a heat insulating portion 1-A interposed therebetween, for example, when cooling a plurality of heating elements in the same equipment housing by a single meandering thin tube heat pipe In some cases, pressure waves generated by nucleate boiling in each of the heat receiving units 1-H may interfere with each other and abnormally deteriorate heat transfer performance.

(5) When the loop type meandering thin tube heat pipe is applied, if the temperature rise of the heat receiving portion 1-H has an upper limit or the temperature drop has a lower limit, a function of freely controlling the heat transport performance. May be required. However, providing such a function is basically difficult for not only the loop-shaped meandering thin-tube heat pipe but also all heat pipes from the operating principle. In some cases, the forced convection flow velocity of the refrigerant fluid C is adjusted. The control of the heat transport performance by such means, that is, the temperature control of the heat receiving portion 1-H, is a very indirect temperature control via a multi-stage heat transfer path, and the response speed is extremely slow and is not practical. there were.

(6) Since the loop-type meandering thin-tube heat pipe performs heat transfer by the axial vibration of the two-phase condensable working fluid 3, the heat of the conventional heat pipe depends only on the phase change of the two-phase condensable working fluid. It is inevitable that the thermal responsiveness will be slightly reduced in principle of operation compared to transportation. However, depending on the application, it may be necessary to exhibit a performance combining both the excellent characteristics of the loop-type thin-tube heat pipe and the excellent thermal responsiveness of the conventional heat pipe. The present invention is intended to solve all of the above-mentioned problems and to provide a loop type meandering thin tube heat pipe with an excellent new function.

[0016]

As described above, most of the causes of [problem to be solved by the invention] are a decrease in heat transport ability due to attenuation of the axial vibration of the hydraulic fluid. [Means for solving the problem] of the present invention is to forcibly circulate the hydraulic fluid in the capillary container of the loop-shaped meandering thin-tube heat pipe, thereby increasing the nucleate boiling of the hydraulic fluid, thereby increasing the axial direction of the hydraulic fluid. Vibration is made active, and at the same time, the substantial amplitude of the axial vibration of the hydraulic fluid is enlarged, thereby greatly increasing the heat transport capacity. At the same time, the thermal response is also significantly improved. It is.

Forcibly circulating the working fluid in the loop type container is used in a large-sized, large-capacity so-called separation type heat pipe. However, in the case of such a conventional separation type heat pipe, the operation principle of the heat pipe is completely different, and therefore, the purpose and operation of forced circulation of the working fluid are completely different. In the case of the separation type heat pipe as illustrated in FIG. 4, when the steam generator 4 and the condenser 5 must be separated and separated from each other due to the configuration of the equipment, the steam generator 4 has a too large capacity or a high temperature and high pressure. Therefore, it is applied to a case where it is difficult to dispose it near the steam condenser 5. Since the separation type heat pipe does not have a function such that the working fluid 3 generates vibration by itself and the amount of heat moves by itself, unlike the loop type meandering thin tube heat pipe, it is necessary to forcibly circulate the working fluid 3. Further, since there is only one hydraulic fluid supply pipe 7 and one hydraulic fluid return pipe 8 for connecting the steam generator 4 and the vapor condenser 5, it is necessary to circulate a large amount of hydraulic fluid 3 in each pipe. In order to circulate the liquid 3, a powerful and large-capacity circulating pump 6 had to be used. The forced circulation of the working fluid 3 in the separation type heat pipe is performed by the steam generator 4
The main purpose is to send the hydraulic fluid to the pump, and the purpose and the operation and effect are completely different from the forced circulation of the hydraulic fluid 3 according to the present invention. Not even.

The forced circulation of the working fluid 3 in the present invention does not mean a simple forced circulation as in the case of a separation type heat pipe, but is intended for the heat receiving portion 1 of each unit metal thin tube 1-1. In other words, a pressure drop due to the flow velocity is generated between the inner wall surface of -H and the boundary layer of the flow of the hydraulic fluid 3. Such a pressure drop on the inner wall surface of each unit thin tube 1-1 enables rapid generation of a large amount of working fluid vapor bubbles 3-1.
The generation of nucleate boiling on the inner wall surface of each unit thin metal tube 1-1 is greatly activated. The activation of each boiling in each unit metal thin tube in the meandering thin tube heat pipe promotes the heat absorption in each heat receiving portion 1-H of each unit metal thin tube 1-1 and the heat radiation portion 1-H. The number and the amount of the groups of the vapor bubbles 3-1 fed into C are increased, and the gaseous phase component of each heat radiating section working fluid 3 which has become liquid phase rich is greatly increased to be changed to gas phase rich. This increases the compressibility and elasticity of the hydraulic fluid in the heat radiating section, and promotes the axial vibration of the gas-phase hydraulic fluid and the axial vibration of the liquid-phase hydraulic fluid in the entire loop of the thin tube container. In addition, both the latent heat transfer and the sensible heat transfer of the working fluid 3 are expanded and amplified. Further, the rapid flow of the hydraulic fluid 3 results in a substantial increase in the amplitude of the axial vibration of the hydraulic fluid 3 and a substantial increase in the surface area of the boundary layer of the flow which plays a major role in heat transfer due to the axial vibration. Significantly increases the heat transport capacity due to directional vibration.

The concrete and basic configuration of [Means for solving the problem] is implemented as illustrated in FIG. FIG. 1 also serves as an explanatory diagram of a first embodiment described later. In the figure, the unit metal thin tube 1-1 constituting the loop type meandering thin tube container is described in the description of [Prior Art] and in the basic structure of the meandering thin tube heat pipe illustrated in FIGS. A forced circulating flow generating means 2-for generating a circulating flow in a predetermined direction in the hydraulic fluid 3 in the heat insulating portion 1-A or a portion where the heat insulating portion 1-A is extended of the predetermined unit metal thin tube 1-1 of the group. 1 is provided. In this case, the forced circulation flow generating means 2-1 withstands the high pressure of the saturated steam around the critical temperature of the steam of the working fluid 3 to be applied, and maintains the complete airtightness of the loop-shaped meandering thin-tube container for a long time. It must have a possible structure, which guarantees the long-term life of the loop-shaped meandering thin-tube heat pipe of the present invention. Also, the flow direction of the forced circulation flow needs to be a direction from the heat radiating section 1-C to the heat receiving section 1-H via the forced circulation flow generating section 2-1. When the flow direction is the reverse direction, the heat receiving section 1- is included in the forced circulation flow generating means 2-1.
A large amount of the working fluid vapor 3-1 generated in H flows in, and the circulation efficiency is greatly reduced.

Many of the ordinary forced circulation flow generating means 2-1 can control the flow velocity to some extent, and can control the heat transport performance of the loop-shaped meandering thin tube heat pipe to a certain extent. When it is necessary to control the performance significantly and precisely, a predetermined unit metal thin tube 1-1 of the meandering thin tube container is provided in addition to the forced circulation flow generating means 2-1 described above.
A flow control means 2-2 for the forced circulation flow of the hydraulic fluid 3 is provided in the heat insulating portion 1-A or an extension of the heat insulating portion 1-A.

[0021]

By implementing the means for solving the problems as described above, the following various functions are exhibited. (1-1) The static pressure on the inner wall surface of the heat receiving portion 1-H of all the unit thin metal tubes 1-1 decreases due to the convection of the forced circulation of the hydraulic fluid 3. Due to the static pressure drop, nucleate boiling in the heat receiving portion 1-H is greatly activated, and the generation of the vapor bubbles 3-1 is greatly increased both numerically and quantitatively. The movement is also facilitated by the convection of the forced circulation of the working fluid 3 toward the heat radiating portion 1-C group of vapor bubbles 3-1 generated. This means that steam bubbles 3-1
Nucleate boiling in the heat receiving portion 1-H and the generation of the vapor bubble 3-1 are further activated by the synergistic effect thereof. (1-2) Heat Bubble 3-1 Inside Heat Radiation Section 1-C
The working fluid 3 inside the heat radiating section 1-C becomes rich in gas phase, and its compressibility and elasticity are significantly improved. (1-3) The axial vibration of all the vapor bubbles 3-1 and the droplets 3-2 in all the containers of the loop-shaped meandering thin tube heat pipe due to the synergistic effect of the items (1-1) and (1-2). Is greatly activated compared to the case where the working fluid 3 is not forcedly circulated, so that the heat transfer capacity is greatly enhanced and the heat transfer sensitivity is greatly improved. Although the heat transfer by the axial vibration of such an operating station alone is improved to an extremely strong one, the circulation of the working fluid 3 not only enhances the heat transfer by the axial vibration, but also operates by the circulating convection. The heat transfer capability of the loop-shaped meandering thin-tube heat pipe of the present invention is further enhanced because an increase in the convective heat transfer coefficient between the liquid and the inner wall of the thin tube is also added.

(2) It is extremely difficult to freely control the heat transfer ability of both the loop-shaped meandering thin-tube heat pipe and the conventional heat pipe based on their operating principles. By implementing the means for solving the problems of the present invention ,
By controlling the flow rate and flow rate of the working fluid 3, the heat transfer capability can be freely controlled.

(3) Japanese Patent Publication No. Hei 6-3354 (loop-type thin tube heat pipe) controls the vibration of the working fluid in a predetermined direction only by the action of a check valve, thereby controlling the working fluid in a predetermined direction. In such a way as to circulate in the direction of. Considering the operation of the loop-type thin tube heat pipe only from the viewpoint of the circulation and promotion of the liquid-phase working fluid, it can be said that it is a kind of fluid pump comprising a combination of a check valve and boiling of the working fluid. In Japanese Patent Publication No. 6-3354 (loop-type thin tube heat pipe), the number of check valves provided is not limited. In order to exhibit the function only as a loop-type thin-tube heat pipe, it is sufficient to provide only a few pieces, but the loop-type snake itself according to the present invention is required to have as much as possible in the line-type thin-tube heat pipe. A check is made at a predetermined portion on the upstream side of the flow of the working fluid 3 in the heat receiving portion 1-H of the unit metal thin tube 1-1, or at predetermined portions on both the upstream side and the downstream side of the heat receiving portion 1-H. A valve is disposed, and the flow direction regulating direction of the working fluid of the check valve is set to a forced circulating flow generating means 2 for the working fluid 3.
By making the same as 1, the loop-type thin tube heat pipe itself can also function as a powerful fluid pump. Therefore, with such a configuration, the forced circulating flow generating means for the hydraulic fluid 3 according to the present invention can be omitted or significantly reduced in volume.

Depending on the type of the working fluid, the steam pressure generated by nucleate boiling is extremely high. Therefore, the circulation pressure of the forced circulation flow generating means 2-1 is less than the steam pressure, and the forced circulation flow generating means 2-1 operates. It may be impossible. In this case, the hydraulic fluid circulates in a predetermined direction by exerting a circulating force by only providing a few check valves. The theory of this circulation is exactly the same as that of Japanese Patent Publication No. 6-3354 (loop-type thin tube heat pipe). In this state, the forced circulation flow generating means 2-
No. 1 is less affected by the steam pressure and can smoothly enhance the circulation flow.

(4) The circulation of the working fluid 3 in the loop-shaped meandering thin-tube heat pipe according to the present invention is such that the gas-phase working fluid (steam bubbles 3-1) and the liquid-phase working fluid (droplets 3) are alternately arranged. 2) Both circulations. Therefore, if it considers only the gas-phase working fluid, it is called pressurized circulation of steam. In the case of the present invention, the inside diameter of the thin tube is sharply reduced near the entrance of the heat receiving portion 1-H of the unit metal thin tube 1-1 to make it extremely thin, and the circulation of the forced circulation flow generating means 2-1 upstream thereof is performed. By increasing the pressure, the vapor bubbles before passing through the constricted portion are compressed and reduced, and the vapor bubbles undergo rapid volume expansion after passing through the constricted portion, and this portion rapidly increases in temperature due to the Joule-Thomson effect. Descends. By performing the above-described operation for a large number of unit thin metal tubes 1-1, the group of the heat receiving portions 1-H can further lower the temperature in addition to the temperature drop due to the air cooling and heat radiation by the group of the heat radiating portions 1-C. The important point of this effect is that it is impossible to cool below the air temperature with ordinary air cooling, but it is possible to cool down to a temperature lower than the air temperature in the case of Joule Thomson effect application That is.

[0026]

FIG. 1 shows a first embodiment of the present invention. FIG. 1 is an explanatory view showing a basic configuration for solving the problem, but as the first embodiment, it is desirable to apply an electromagnetic pump as the forced circulation flow generating means 2-1. An electromagnetic pump is by no means a powerful pump for generating circulating propulsion. However, since it can be mounted without providing any mechanical working part inside the slot, it is extremely reliable and can be applied without impairing the high reliability of the loop type meandering thin tube heat pipe. It can be said that the fluid pump is suitable for implementation. The electromagnetic pump cannot increase the circulating propulsion force, but the loop-type meandering thin-tube heat pipe provided with a large number of check valves does not need to have so much additional circulating propulsion force because the white body has a pumping action .
From this point, it is said that the suitability for the present invention is good.
I can. Some electromagnetic pumps exert a strong propulsive force by using a diaphragm and a check valve in combination. In the case of this type, it is necessary to give high reliability by paying attention to the materials of the diaphragm and the valve body. 2-2 is a flow regulating valve which is provided when a large flow control is required beyond the flow control range of the electromagnetic pump.

Second Embodiment FIG. 5 shows a second embodiment of the present invention. For simplification of the drawing, the capillaries are shown in a diagram. In this embodiment, the loop type meandering thin tube heat pipe is composed of a plurality of units of a meandering thin tube heat pipe unit U in which a predetermined number of unit metal thin tubes 1-1 are connected in series and meandering to form a series of unit units. U-1, U-2, U-3
And a hydraulic fluid supply header 9 and a hydraulic fluid discharge header 1 of each of the meandering thin tube heat pipe units U have a hydraulic fluid supply side terminal and a hydraulic fluid discharge side terminal, respectively.
0, and each header 9, 10 is disposed at a position where it does not hinder the operation of the heat radiating means of the heat radiating portion C of each of the thin tube heat pipes.
10 are connected to each other by a connecting pipe 11, and this connecting pipe 11 is one of the constituent elements of the circulation loop of the hydraulic fluid, and each meandering thin tube heat pipe unit U =! , U-2,
Together with the parallel assembly of U-3, the forced circulation flow generating means 2-1 and the flow rate adjusting means 2-2, a loop of the circulating flow of the working fluid is formed, and these are configured as a loop type meandering thin tube heat pipe 1 as a whole. It is.

With such a configuration, the pressure loss of the hydraulic fluid in the loop-type meandering thin-tube heat pipe of this embodiment is increased even if the number of the unit metal thin-tubes 1-1 is increased. Can be configured without increasing beyond a predetermined height. Since the diameter of the headers 9 and 10 can be increased, the headers 9 and 10 can be easily connected to the hydraulic fluid inlet and outlet of the forced circulation flow generating means 2-1 and the flow rate adjusting means 2-2, and their functions can be extracted without waste. And utilize it.

Third Embodiment FIG. 6 shows a third embodiment of the present invention. FIG. 6 is a partially enlarged view of a part of the loop-type thin tube heat pipe. In the figure, a predetermined portion on the upstream side of the flow of the working fluid close to the heat receiving portion 1-H of the plurality of unit metal thin tubes 1-1 in the working fluid circulation flow path in the loop-shaped thin tube heat pipe 1 or heat reception. A check valve 12 is provided at a predetermined portion on both the upstream side and the downstream side of the portion 1-H, and the check valve 12 regulates the flow of the hydraulic fluid in the same direction as the flow direction of the hydraulic fluid circulation flow. It is characterized by being arranged to do. In the loop-type thin tube heat pipe 1 thus configured, all of the loop-type thin tube heat pipes 1 are small due to the axial vibration of the working fluid and the interaction of a large number of pressure chambers formed by being partitioned by the check valve 12. It acts as a series connection of fluid pumps. The details of this operation are described in the specification of Japanese Patent Publication No. 6-3354 (loop-type thin-tube heat pipe) , and will not be described. This pumping action is powerful but has a small flow rate and cannot be replaced with the forced circulating flow generating means.
It is desirable to use together with -1.

Fourth Embodiment FIG. 7 is a partially enlarged sectional view of a fourth embodiment of the present invention. The inner diameter of the container is sharply reduced at any one of the small portions before and after the vicinity of the working fluid inlet of the heat receiving portion 1-H of the plurality of unit metal thin tubes 1-1 of the loop-type thin tube heat pipe 1-1. It is characterized in that the circulating pressure of the forced circulating flow generating means 2-1 of the hydraulic fluid 3 is increased in inverse proportion to the reduction ratio of the throttle inner diameter to the unit metal thin tube inner diameter. I have. In the figure, a tip 14 having a nozzle with a small inside diameter is press-fitted and fixed in place of the restriction of the inside diameter of the container. 1
Reference numeral 5 denotes a weld for fixing the press-fitting tip 14 in an airtight manner. When the pressure of the forced circulating flow generating means 2-1 of the loop-shaped thin tube heat pipe 1 having such a configuration is increased and operated, the nozzle 13 having a small inner diameter exerts the Joule-Thomson effect and the heat receiving portion. It significantly lowers the temperature of 1-H. In this case, the temperature can be lower than the temperature of the cooling air blown to the heat radiating section 1-C.

[0031]

According to the present invention, a continuous long thin tube having an outer diameter of 2 mm and an inner diameter of 1.4 mm is formed to form a sword-shaped radiator having a fin height of 80 mm and a single-pin group having 105 pairs of pins. did. The heat dissipation heat resistance was 0.1 ° C./W at a wind speed of 3 m / s. A 14-unit metal thin tube of the meandering thin tube of this radiator was regarded as one unit, and a heat sink ability was measured by constructing a sword-shaped radiator of the second embodiment according to the present invention as a structure composed of 15 units. The heat dissipation heat resistance was improved to 3 m / s and 0.045 ° C./W at a flow rate of the circulating hydraulic fluid of 0.25 l / min. Next, when only the flow rate of the circulating hydraulic fluid was increased to 0.51 / min, the heat radiation heat resistance was further improved to 0.025 ° C./W.

The present invention makes it possible to remarkably improve the heat transport performance of the meandering thin-tube heat pipe as described above, and it is possible to increase the capacity without increasing the size of the radiator and to obtain the following advantages. It has the effect. Operation during long-distance heat transfer, top-heat heat transfer with large head difference, heat transfer under supercooling condition of radiator, heat transfer under low temperature difference and small heat input condition Active and secure. Furthermore, since the heat radiation capability that is impossible with the conventional heat pipe can be freely controlled, the application area of the heat pipe is expanded. Further, the Joule-Thomson effect can be used, and the object to be cooled can be cooled to a low temperature equal to or lower than the air temperature even with air-cooled heat radiation.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a basic structure and a first embodiment of the present invention.

FIG. 2 is an explanatory view showing a conventional meandering thin tube heat pipe.

FIG. 3 is an explanatory view of an operation state of a conventional meandering thin tube heat pipe.

FIG. 4 is an explanatory diagram showing a configuration of a conventional separation type heat pipe.

FIG. 5 is an explanatory view showing a second embodiment of the present invention.

FIG. 6 is a partially enlarged explanatory view showing a third embodiment of the present invention.

FIG. 7 is a partially enlarged explanatory view showing a fourth embodiment of the present invention.

[Explanation of symbols]

 A Heat insulation part C Cooling means H Superheating means 1 Loop type thin tube 1-1 Unit metal thin tube 1-A Heat insulating part 1-H Heat receiving part 1-C Heat radiating part 2-1 Forced circulation flow generating means 3 Working fluid 3-1 Steam bubbles 3-2 Metal flat plate 3-3 Droplet 3-4 Metal flat plate 4 Steam generator 5 Steam condenser 6 Pump 7 Working liquid supply pipe 8 Working liquid return pipe 9 Working liquid supply header 10 Working liquid discharge header 11 Connecting pipe 12 Reverse Stop valve 13 Micro-small diameter nozzle 14 Tip 15 Brazing part

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-48-101640 (JP, A) JP-A-62-252892 (JP, A) JP-A-1-111198 (JP, A) JP-A-4- 251189 (JP, A) JP-A-63-318493 (JP, A) JP-B-6-3354 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F28D 15/00

Claims (1)

(57) [Claims] The inner diameter of a metal thin tube that constitutes a meandering thin tube heat pipe is always set in the pipe even if the amount of sealing is very small due to the cohesive force generated by the surface tension of the working fluid sealed therein. Is filled and closed, and the inside diameter is small enough to move inside the tube regardless of the holding posture of the thin tube heat pipe, and such a long thin tube is placed at a predetermined position. Between the arranged heating means and the cooling means arranged at a predetermined position, the heating means absorbs the heat and reverses to the cooling means via the heat insulating part, and the cooling means. Inverts while releasing the heat and goes to the heating means via the heat insulating portion, repeats such inversion meandering many times, and a series connection of a number of unit metal thin tubes each having a heat receiving portion, a heat insulating portion and a heat radiating portion. Formed as meandering tubules A loop-shaped meandering tubing in which both ends of the meandering tubule are circulated and air-tightly connected by a predetermined means to form a loop is applied as a heat pipe container, and the inside of the closed container is a high vacuum. A predetermined number of predetermined two-phase condensable working fluid is sealed, and a predetermined number of unit metal thin tubes are connected in series in a loop-shaped meandering thin tube heat pipe configured as a heat pipe. A non-loop type meandering thin tube heat pipe unit is configured as a series of unit units, and the loop type meandering thin tube heat pipe unit is configured as a parallel assembly of this non-loop type meandering thin tube heat pipe unit,
The working fluid supply side terminal and the working fluid discharge side terminal of each non-loop type meandering thin tube heat pipe unit are air-tightly connected to a working fluid supply header and a working fluid discharge header, respectively, by a connection pipe. As one of the constituent elements of the working fluid circulation loop, together with the parallel assembly of the non-loop type meandering thin tube heat pipe unit, the forced circulation flow generating means and the flow rate adjusting means, etc., form a loop of the working fluid circulation flow path, These are configured as loop-type meandering thin tube heat pipes as a whole.