JPS6260638B2 - - 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 effective in a so-called top heat mode in which the upper portion is 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 smoothly into the uneven portion 3, and furthermore, the substantial length of each heat pipe 1, 2 is L shown in FIG. In the case of the 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. Between the working fluid in the heat pipe 4 and the working fluid in the second heat pipes 5, 6, there are respective wicks 7, 8, 9 and containers 10,
Therefore, the heat transfer resistance (total thermal resistance) between the first heat pipe 4 and the second heat pipes 5 and 6 is large, and as a result, the first The second via heat pipe 4
The heat transfer between the heat pipes 5 and 6 is poor,
In the case of the top heat mode, there is a problem that even if sufficient reflux of the liquid phase working fluid occurs, heat transport may not be carried out sufficiently.

On the other hand, in addition to capillary action, conventional methods for refluxing liquid-phase working fluids have been considered, such as applying external centrifugal force, electrostatic force, electromagnetic force, or using osmotic pressure. According to such a method, it may be possible to reflux the liquid phase working fluid to a considerably high position even in the top heat mode. However, when using centrifugal force, electrostatic force, or electromagnetic force, the energy applied from the outside is consumed, so heat pipes have the characteristic that they can transport heat without applying external energy. In addition, when electrostatic force, electromagnetic force, or osmotic pressure is used, there is a problem that the usable working fluid is limited.

In view of the above-mentioned circumstances, the present invention provides a top-heat type heat pipe 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 has a tapered hollow tube rotatably arranged in a sealed tube such that a large diameter opening is located in a heating section and a small diameter opening is located in a cooling section, and is rotated by a gas phase working fluid. A turbine is attached thereto, and the liquid-phase working fluid is forcibly returned from the cooling section to the heating section by centrifugal force generated when the tapered hollow tube is rotated by the turbine. It is something to do.

An embodiment of the present invention will be described below with reference to FIG.

As shown in FIG. 3, the sealed tube 20 constituting the exterior body has an upper opening closed by a plug 21. A liquid injection port 22 is provided which is sealed after injecting the working fluid. Further, a tapered hollow tube (hereinafter referred to as a tapered tube) 23 for pumping liquid is inserted into the sealed tube 20 along its central axis. As shown in FIG. 3, the tapered tube 23 has a pair of upper and lower bearings 26, 27 and a pair of upper and lower bearings 26, 27 so that the large diameter opening 24 is located on the upper side and the small diameter opening 25 is located on the lower side. It is rotatably attached to the sealed tube 20 by retainers 28 and 29 that hold the same. A turbine 30 is installed on the outer peripheral surface of the intermediate portion of the tapered pipe 23 configured in this way.
are provided integrally, so that the tapered pipe 2
3 is adapted to be rotationally driven by a turbine 30.

A blade 31 is attached to the inner circumferential surface of the lower end of the tapered tube 23 on the same axis. A lower end portion of the tapered tube 23 provided with a slit is housed in a casing 33 that is attached downward to the lower retainer 29. These blades 31 and casing 33 are
It constitutes an axial flow type pump, and when the vanes 31 rotate together with the tapered pipe 23, liquid-phase working fluid 32 is sent into the tapered pipe 23. A check valve 35 is provided at the lower end of the casing 33 to automatically open and close the opening using a ball 34.

On the other hand, at the upper end of the tapered pipe 23, the tapered pipe 23
The liquid phase working fluid 32 rising along the inner peripheral surface of
A disc 36 is attached to guide the inner peripheral surface of the upper end of the sealed tube 20. On the other hand, a liquid reservoir section 37 that opens upward for storing the liquid-phase working fluid 32 sent from the disk 36 is provided on the inner circumferential surface of the upper end of the sealed tube 20.
A wick 38 that is in close contact with the inner peripheral surface of the upper end is inserted into the liquid reservoir 37.

Furthermore, each of the retainers 28 and 29 includes:
Vent port 4 for passing gas-phase working fluid 39
0,41 are formed, and these vent holes 4
A vent hole 40 of the retainer 28 located above the turbine 30 out of 0.0 and 41 is connected to a gas phase working fluid 39.
It is configured as a throttle for increasing the flow rate to the turbine 30 by applying a restriction to the turbine 30. Note that when the turbine 30 is a positive displacement turbine, it goes without saying that there is no need to particularly increase the speed of the gas phase working fluid 39 in the preceding stage.

Next, to explain the function of the heat pipe configured as above, the above heat pipe is usually installed facing up and down as shown in Fig. 3.
Its upper end is a heating section H, and its lower end is a cooling section C.
used as. The liquid-phase working fluid 32 is in direct contact with the inner circumferential surface of the upper end of the sealed tube 20 through a wick 38 that is partially inserted into the liquid reservoir 37, and the liquid-phase working fluid 32 is transferred to the heating section H. It evaporates due to the heat applied. On the other hand, cooling section C
On the side, the working fluid condenses and liquefies due to the heat removed. Therefore, the pressure inside the sealed tube 20 is high on the heating section H side and low on the cooling section C side.
As the gas-phase working fluid 39 flows in this manner, the turbine 30 is rotationally driven by the gas-phase working fluid 39, and as a result, the tapered pipe 23 rotates together with the turbine 30. In that case, the turbine 30
If the turbine 30 is an expansion type turbine, the speed of the gas phase working fluid 39 is increased by passing through the vent hole 40 in the upper retainer 28, so that the turbine 30
is rotated more actively.

When the tapered tube 23 rotates as described above, the blade 31 provided on the inner peripheral surface of the lower end portion closes the sealed tube 2.
The liquid-phase working fluid 32 accumulated at the bottom of the pipe 23 is sent into the tapered pipe 23. liquid phase working fluid 32
rotates within the tapered tube 23 together with the tapered tube 23, and as a result, a centrifugal force acts on the liquid phase working fluid 32. However, since the inner diameter of the tapered tube 23 increases toward the upper end, the liquid phase working fluid 32 The liquid is gradually pushed upward and ultimately returned to the liquid reservoir 37 via the disk 36. Thereafter, the liquid phase working fluid 32 is again dispersed on the inner peripheral surface of the upper end of the sealed tube 20 by the wick 38, and then heated and evaporated.

Therefore, in the heat pipe having the above configuration, the liquid phase working fluid 32 is returned to the heating section H side by the centrifugal force generated by rotating the tapered tube 23 by the turbine 30.

In addition, in order to increase the amount of heat transport, liquid phase working fluid 3
2, if it is necessary to increase the reflux amount of the turbine 30, a reheating fin is provided on the inlet side of the turbine 30, that is, on the upstream side in the flow direction of the gas phase working fluid 39, and the part where the fin is provided is also installed. It is preferable to increase the enthalpy of the gas phase working fluid 39 on the inlet side of the turbine 30 by providing the heating section H.

As is clear from the above description, according to the heat pipe of the present invention, the tapered hollow tube is rotatably arranged in a sealed tube such that the large diameter opening is located in the heating section and the small diameter opening is located in the cooling section. A turbine rotated by gas-phase working fluid is attached to the tube, and the liquid-phase working fluid is transferred from the cooling section to the heating section by the centrifugal force generated when the tapered hollow tube is rotated by the turbine. Since the structure is configured to force reflux, the liquid phase working fluid can be reliably refluxed to the heating section without applying any external energy and even if there is a considerable height difference between the heating section and the cooling section. Furthermore, even if there is a considerable height difference between the heating section and the cooling section, heat can be efficiently transported.

[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 sectional view showing an embodiment of the present invention. . 20... Sealed tube, 23... Tapered hollow tube, 24...
Large diameter opening, 25... Small diameter opening, 30... Turbine, 32... Liquid phase working fluid, 39... Gas phase working fluid,
C...Cooling section, H...Heating section.

Claims (1)

[Claims] 1. By heating one end of a sealed tube containing a working fluid and cooling the other end, the working fluid evaporated at one end of the sealed tube is caused to flow to the other end of the sealed tube and then condensed and liquefied. In the heat pipe for transporting heat, the large diameter opening is located at one end of the sealed tube where the working fluid evaporates, and the small diameter opening is located at the other end of the sealed tube. A turbine is rotatably disposed within the sealed tube such that the turbine is rotatably positioned within the sealed tube, and a turbine is attached to a predetermined location on the outer periphery of the tapered hollow tube to rotate by the gas-phase working fluid flowing within the sealed tube. A top-heat type heat pipe characterized in that the liquid-phase working fluid is caused to flow back to one end of the sealed tube by centrifugal force caused by rotation of the tapered hollow tube.