JPS6237756B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat pipe, and more particularly to a heat pipe that is arranged vertically and is effective in a so-called top heat mode with its upper portion serving as a heating section.

As is well known, conventional heat pipes have a structure in which a heat pipe is placed inside an airtight container and a working fluid is sealed inside.The working fluid is heated and evaporated in the heating section, and then flows to the cooling section where the vapor pressure is low. By dissipating and condensing heat, the heat is transported as latent heat of the working fluid, and the liquid-phase working fluid is refluxed by the capillary pressure generated by the wick. It has a thermal conductivity that is between twice and hundreds of times higher.

However, since conventional heat pipes use capillary pressure to reflux liquid-phase working fluid, the heat pipe is vertically erected, and its upper end serves as a heating section, while its lower end serves as a cooling section. In the top heat mode, when the height difference between the heating section and the cooling section exceeds several tens of centimeters, the head difference of the liquid phase working fluid between the heating section and the cooling section becomes larger than the capillary pressure caused by the wick. As a result, the liquid-phase working fluid does not return to the heating section, resulting in a disadvantage that heat transport cannot be carried out.

In order to eliminate this inconvenience, for example, as shown in FIG.
It is conceivable to arrange them on the same axis and connect them to each other, and to provide uneven parts 3 at the connecting parts to increase the heat transfer area and thereby shorten the length over which the liquid-phase working fluid must be refluxed. In such a configuration, the liquid-phase working fluid does not necessarily flow back smoothly to the uneven portion 3, and furthermore, the substantial length of each heat pipe 1, 2 is L as shown in FIG. In the case of the top heat mode, the reflux of the liquid phase working fluid is insufficient, in other words, the heat transport ability is poor, and there is a drawback that a large temperature difference occurs between both ends.

Conventionally, the first heat pipe 4 is formed into a hollow cylinder shape as shown in FIG. 2, and the second heat pipes 5, 6 are inserted into the hollow part from both sides. A configuration has been proposed that connects and integrates the
113356) However, in such a configuration, the adhesion between the hollow cylindrical heat pipe 4 and the second heat pipes 5 and 6 may deteriorate, and an air layer may be formed between them. The peripheral walls of the respective heat pipes 7, 8, 9 and the containers 10, 11, 12 are present between the working fluid in the first heat pipe 4 and the working fluid in the second heat pipes 5, 6. Therefore, the heat transfer resistance between the first heat pipe 4 and the second heat pipes 5 and 6 is large, and as a result, the heat transfer resistance between the first heat pipe 4 and the second heat pipes 5 and 6 is large. In the case of top heat mode, the heat transfer between
Even if sufficient reflux of the liquid-phase working fluid occurs, there are problems such as insufficient heat transport.

On the other hand, as a method for refluxing a liquid-phase working fluid, methods using centrifugal force, electrostatic force, electromagnetic force, or osmotic pressure in addition to capillary action have traditionally been considered. ,
In the case of top heat mode, it may be possible to circulate the liquid phase working fluid to a considerably high position, but when using centrifugal force, electrostatic force, or electromagnetic force, mechanical energy or electrical energy must be applied from the outside. Furthermore, when electrostatic force, electromagnetic force, or osmotic pressure is used, there is a problem in that the working fluid that can be used is limited.

In view of the above-mentioned circumstances, the present invention provides a heat pipe for top heat that can sufficiently transport heat even when there is a considerable height difference between the heating section and the cooling section, and has an excellent heat transport ability. The purpose is to That is, the present invention arranges a turbine rotated by a gas-phase working fluid and a pump driven by the turbine in a tube sealed with the working fluid, and the liquid pumped by the pump is The working fluid of the phase is configured to be circulated from the cooling side end to the heating side end of the pipe body through both the hollow connecting shaft connecting the turbine and the pump and the hollow rotating shaft of the turbine. It is something to do.

Embodiments of the present invention will be described below with reference to FIGS. 3 and 4.

In FIG. 3, reference numeral 20 denotes a pipe with a closed structure that encloses a working fluid. A liquid reservoir 22 for storing a fluid 21 is provided, and a wick 23 made of a metal net or the like is disposed on the inner circumferential surface of the liquid reservoir 22 on the upper end side in FIG. 3. This wick 23 sucks up the liquid phase working fluid 21 from the liquid reservoir 22 and makes it reach the entire inner circumferential surface of the end side which is used as a heating section, and its length in the axial direction is the same as the upper end of the wick 23. Liquid phase working fluid 2 at the lower end
The length is set such that the head difference of 1 is less than the capillary pressure generated in the pipe 23, so that the liquid phase working fluid 21 in the liquid reservoir 22 rises to the upper end of the pipe 20 against gravity. It's summery.

Furthermore, a gas phase working fluid 2 is provided inside the pipe 20.
A turbine 25 as a kinetic energy conversion device rotated by a turbine 4 is arranged. turbine 2
5 converts a part of the kinetic energy of the gas phase working fluid 24 into mechanical rotational force,
For example, it is an axial flow type, and its turbine 2
5 is fixed within the pipe 20 so that the rotating shaft 26 coincides with the central axis of the pipe 20. Further, the rotating shaft 26 of the turbine 25 forms a return path for the liquid-phase working fluid 21 as will be described later, and is formed of a small diameter pipe, and the upper end thereof is supplied with a rotary coupling 27. A liquid pipe 28 is connected, and the liquid supply pipe 28 is connected to the liquid reservoir 22.
It is connected to the. Note that since it is preferable that the entire amount of the gas-phase working fluid 24 generated by evaporation of the liquid-phase working fluid 21 passes through the turbine 25, a heat insulating section is especially provided in the middle part of the pipe 20 to prevent heat from entering or exiting. If not provided, the turbine 25 may be installed at a substantial boundary position between the heating section and the cooling section, and if a heat insulating section is provided, the turbine 25 may be installed at a location corresponding to the heat insulating section. preferable.

Furthermore, a pump 29 as a liquid-phase working fluid recirculation device is disposed inside the end portion (lower end portion in FIG. 3) of the pipe 20 that is used as a cooling section, so as to be constantly immersed in the liquid-phase working fluid 21. The pump 29 is connected to the rotating shaft 2 of the turbine 25 by a connecting shaft 30 made of a small diameter pipe so as to be operated by the turbine 25.
6. The pump 29 pumps up the liquid-phase working fluid 21 to a liquid reservoir 22 provided at the upper end of the pipe 20. The pump 29 has a central axis 29a formed of a hollow tube, and
The central axis 29a of the pump 29 is a discharge pipe, and when the pump 29 operates, the liquid phase working fluid 21 is transferred to the central axis 29a of the pump 29 and the connecting shaft 3.
0, rotating shaft 26 of turbine 25 and liquid supply pipe 28
The liquid is refluxed to the liquid reservoir 22 through the process. Note that since the rotating shaft 26 and the liquid supply pipe 28 of the turbine 25 are located in the heating section, the liquid phase working fluid 21 pumped up by the pump 29 is inside the rotating shaft 26 and the liquid supply pipe 28 of the turbine 25. In order to prevent evaporation, it is preferable that at least the rotating shaft 26 and the liquid supply pipe 28 have a heat insulating structure to prevent heat from flowing in from the outside.

The heat pipe configured as described above is erected along a vertical line as shown in Figure 3, and heat Q is applied to its upper end to form a heating section, and heat Q is applied from the lower end.
When the cooling section is taken away, that is, when the top heat mode is used, the working fluid evaporates in the heating section and condenses in the cooling section, resulting in a pressure difference between the heating section and the cooling section. The gas-phase working fluid 24 flows from the heating section toward the cooling section at high speed (subsonic to supersonic speed), and the gas-phase working fluid 24 passes through the turbine 25, causing the turbine 25 to rotate, and the pump 29 to rotate. is driven. Therefore, the liquid phase working fluid 21 condensed in the cooling section is pumped by the pump 29 to its central shaft 29a, the connecting shaft 30, and the rotating shaft 26 of the turbine 25.
The liquid is then pumped and refluxed to the liquid reservoir 22 of the heating section via the liquid supply pipe 28, and then further sucked up into the entire heating section by the wick 23. Thereafter, the working fluid circulates while repeating evaporation and condensation as described above, so that heat can be continuously transported from the upper heating section to the lower cooling section.

However, in the above heat pipe, the pump 29
Since the liquid-phase working fluid 21 is returned to the heating section by
Since the pump 29 is driven by the turbine 25 rotated by the gas-phase working fluid 24, in other words, part of the heat to be transported is Since the energy is utilized to drive the pump 29, the pump 29 can be operated normally without any particular external supply of energy.

Note that the present invention is not limited to the above-described embodiment, and if the lift of the pump 29 is sufficiently large, the liquid supply pipe 28 can be connected to the pipe 20 as shown in FIG.
A dispersion plate 31 that extends to the upper end and has the upper end of the liquid supply pipe 28 inside the upper end of the pipe 20.
It may be configured such that the dispersion plate 31 is opened at the top surface and the liquid-phase working fluid 21 is distributed to the inner circumferential surface of the pipe 20 and made to flow down. Dame 22 and Uitsuku 23
can be omitted. Further, the pump 29 does not necessarily need to be installed in the end portion which is the cooling portion, and the pump may be installed in the heating portion to suck up the liquid phase working fluid 21 from the cooling portion to the heating portion.

As is clear from the above description, according to the heat pipe of the present invention, a turbine rotated by a gas-phase working fluid and a pump driven by the turbine are housed in a tube containing the working fluid. The liquid-phase working fluid pumped by the pump is passed through both the hollow connecting shaft connecting the turbine and the pump and the hollow rotating shaft of the turbine from inside the cooling side end of the pipe body to the heating side. Since it is configured to flow back into the end, even in the top heat mode where there is a large height difference between the heating section and the cooling section, the liquid phase working fluid can be reliably refluxed to the heating section and sufficient heat can be transported. Furthermore, since the pump is driven using part of the thermal energy to be transported, it is possible to eliminate the inconvenience of having to supply energy from the outside.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an example of a conventional heat pipe, FIG. 2 is a schematic sectional view showing another example of a conventional heat pipe, and FIG. 3 is a schematic sectional view showing an embodiment of the present invention. FIG. 4 is a partial sectional view showing a part of another embodiment of the invention. 20... Pipe, 21... Liquid-phase working fluid, 24... Gas-phase working fluid, 25... Turbine, 26... Rotating shaft, 2
9...Pump, 30...Connection shaft.

Claims (1)

[Claims] 1 An axial flow turbine rotated by a gas-phase working fluid is arranged in a tube containing a working fluid along the center axis of the tube, and is connected to the rotating shaft of the axial turbine via a connecting shaft. A pump is disposed within the cooling side end of the tube body, and the rotary shaft of the axial turbine and the connecting shaft are made into hollow shafts to communicate with each other, and the liquid phase working fluid pumped by the pump is transferred to these. 1. A heat pipe for top heating, characterized in that the heat pipe is configured to flow back from the cooling side end to the heating side end of the pipe body through the connecting shaft and the rotating shaft.