JPH0726795B2 - Heat transport pipe - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat transport tube using a fluid as a heat medium.

[Prior Art] A heat pipe is currently in practical use as a heat transport pipe.

The heat pipe has a structure in which a heat working medium is enclosed in a sealed tube and a wick material that promotes movement of a liquid working medium by a capillary phenomenon is inserted.

By disposing one end of the heat pipe in the high heat source and the other end in the low heat source, the heat working medium evaporates and absorbs heat on the high heat source side, and the evaporated vapor is cooled and condensed on the low heat source side. Dissipate heat. The condensed and liquefied heat working medium moves to the high heat source side by the wick material, and evaporation and liquefaction continue.

Thus, heat transfer is performed by heat absorption on the high heat source side and heat dissipation on the low heat source side.

[Problems to be Solved by the Invention] As described above, heat transfer is performed in the heat pipe by evaporation and condensation of the heat working medium. Therefore, the operating temperature depends on the evaporation or condensation temperature of the medium used or the filling pressure. Therefore, the heat working medium is determined by the temperatures of the high heat source and the low heat source, and in some cases, there is no suitable heat working medium and the heat pipe cannot be used.

Further, there are various restrictions on the structure, such as vacuuming work for enclosing the heat working medium, using a wick material, and the heat pipe itself being a pressure vessel. .

[Means for Solving the Problems] In view of the above circumstances, the present invention aims to provide a heat transport pipe having a simple structure, easy manufacture, and an extremely wide operating condition. A fluid reservoir is formed on each of the heat sources, both of them are communicated by a communication pipe, and one of the fluid reservoirs can be vibrated, and the inner wall of the communication pipe has a boundary layer formed of a fluid in contact with the inner wall of the pipe. Boundary layer holding means for holding the stationary state is provided.

[Operation] The fluid in the fluid reservoir moves in and out of the communication pipe by vibrating the fluid, and is formed by the fluid flowing in and out and the fluid in contact with the inner wall of the communication pipe, and the stationary state is maintained by the boundary layer holding means of the inner wall of the communication pipe. The heat is transferred to and from the boundary layer, and the heat is transferred from one fluid reservoir to the other fluid reservoir via the fluid in the communication pipe.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

First, the outline of the present embodiment will be described with reference to FIG.

In this embodiment, an example in which water is selected as the heat medium is shown.

1 is a high temperature water tank, 2 is a low temperature water tank, and both water tanks 1 and 2 are connected by a communication pipe 3 extending in the horizontal direction. The high temperature water tank 1 is provided with a heater 4 for heating the water stored in the water tank (the heater is tentatively shown as a heat source and is actually a heating element of an electronic device, etc.) 4. A vibration exciter 5 for vibrating the water in 1 is provided.

In the above-mentioned structure, when the water in the high temperature water tank 1 is heated to the required temperature by the heater 4 and is vibrated by the vibration exciter 5, vibration is generated in the low temperature water tank 2 via the water in the communication pipe 3. Although propagated to water, heat moves to the low temperature water tank 2 side due to this vibration.

Almost no convection of water occurs in the communication pipe 3,
Therefore, vibration is indispensable for the heat transfer in the communication pipe 3, and if the vibration is stopped, the heat transport is also stopped. Further, since the heat transport amount is also determined by the vibration amount, the vibration amount may be increased when the transport amount is desired to be increased and the vibration amount may be reduced when the transport amount is desired to be decreased.

Next, an outline of the principle of heat transfer in the communication pipe 8 will be described with reference to FIGS.

When vibration is applied to the water 6a in the high temperature water tank 1 by the vibrator 5, the water 6a enters and exits the high temperature side end of the communication pipe 3, and the water in the communication pipe 3 moves. Regarding the movement behavior of water in the communication pipe 3,
Considering a little, the movement of the actual water occurs only in the communication pipe 3 except the boundary layer 8 in contact with the pipe wall 7.

The movement of water due to vibration on the compression side is shown in FIG. 2, but from the water (hereinafter referred to as high temperature water) 6a (hereinafter referred to as high temperature water) in the high temperature water tank 1 that has entered the communication pipe 3 to the boundary layer. Heat transfer occurs toward 8 and the boundary layer 8 is heated.

Next, when vibration occurs on the expansion side, the high temperature water 6a that has entered returns to the high temperature water tank 1, and conversely, the water (hereinafter referred to as low temperature water) 6b in the low temperature water tank 2 enters the communication pipe 3. (See Figure 3). However, since the boundary layer 8 is heated as described above, heat is transferred from the boundary layer 8 to the water in the communication pipe 3 to raise the temperature of the water inside.

When the vibration on the compression side occurs again, the high temperature water 6a enters and heats the boundary layer 8 in the same manner as described above, but the part of the water heated at the time of the vibration on the expansion side moves to the low temperature water tank 2 side, and again the boundary The layers are heated (Fig. 4).

Next, due to the vibration on the expansion side, heat is transferred from the boundary layer 8 to the water in the communication pipe 3 in the portion where the high temperature water has entered, and further in the portion where the low temperature water tank 2 is present (see FIG. 5).

Heat transfer can be performed by vibrating the water in the high temperature water tank (of course, the water in the low temperature water tank) by the mechanism described above. In addition, this heat transfer is performed by vibration mediation, the heat transfer amount is determined by the vibration amount (amplitude x frequency), the heat transfer speed is determined by the heat transfer speed (frequency), and the heat transfer is stopped by stopping the vibration. To be done.

As described above, in the heat transfer mechanism, the communication pipe 3
The inner boundary layer 8 plays a larger role, and the larger the temperature difference between the boundary layer and the moving water, the higher the heat transport capacity.

Further, if the boundary layer 8 is set in a state where it is likely to receive heat from the high temperature water 6a that has entered, the heat transport efficiency is further increased.

One way to increase the heat transfer capacity of the boundary layer 8 is to ensure the stationary of the boundary layer and to increase the contact area between fluids.

6 to 9 show examples of the structure of the communication pipe 3 in which the stationary of the boundary layer 8 is ensured.

In FIG. 6, the coil 10 is inserted into the communication pipe 3 and the coil 10 is brought into close contact with the pipe wall 7. The presence of the coil 10 causes water to be retained between the wire rods of the coil, which ensures that the boundary layer remains stationary.

FIG. 7 shows a large number of protrusions 11 formed on the pipe wall 7,
Water is also retained by the projections 11.

Further, FIG. 8 shows a wire mesh 12 provided along the pipe wall 7, and FIG. 9 shows a punch metal 13 having the same function as the wire mesh 12.
Is provided.

Alternatively, although not particularly shown, a porous layer such as sponge may be formed on the surface of the tube wall.

Further, as another means for increasing the heat transfer capability of the boundary layer 8, an auxiliary means for promoting heat transfer between the boundary layer 8 and the high temperature water 6a can be provided. That is, the coil 10 and the protrusion described above.
If copper, aluminum or the like having a high thermal conductivity is selected as the boundary layer holding means for the wire mesh 12 and the like, the holding means receives heat from high temperature water in addition to the above-described heat transfer mechanism,
Furthermore, a heat transfer path is secured in which the boundary layer receives heat from the holding means.

Also, a large number of communication tubes 3 may be provided with a small diameter, a large number of thin tubes may be inserted into the communication tube 3 of a large diameter, and a cotton fiber-shaped metal fiber may be packed in the communication tubes. Good. Or
If the communication pipe 3 has good heat conduction in the axial direction, the temperature difference between the boundary layer and the moving water side becomes small and the heat transfer efficiency decreases. Thermal insulation may be provided between the two.

Furthermore, although the heat medium is water in the above embodiment, it may be other liquid such as oil or gas such as air.

[Effects of the Invention] As described above, according to the present invention, the following excellent effects can be exhibited.

(I) It is possible to transfer heat between a high heat source and a low heat source that are separated from each other.

(Ii) Since heat transfer does not require a phase change of the heat medium, any heat medium may be used, and the type of heat medium to be used may be limited by the temperature of the high heat source and the low heat source. Absent.

(Iii) The start and stop of heat transport can be performed by applying vibration to the heat medium and stopping the vibration, and the amount of heat transport can be increased or decreased by changing the vibration mode, so control of heat transport is extremely easy. .

(Iv) In addition to vibrating the fluid as the heat medium, the boundary layer holding means is provided on the inner wall of the communication pipe to hold the stationary state of the boundary layer formed by the fluid in contact with the inner wall of the communication pipe. The heat transfer capacity of the boundary layer can be increased, and the heat transport capacity can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an outline of one embodiment of the present invention, FIGS. 2 to 5 are explanatory views showing a mechanism of heat transport, and FIGS.
FIG. 9 is an explanatory diagram showing another embodiment. 1 is a high temperature water tank, 2 is a low temperature water tank, 3 is a communication pipe, 4 is a heater, 5 is a vibrator, and 8 is a boundary layer.

Claims (1)

[Claims] 1. A fluid reservoir is formed on each of a high heat source side and a low heat source side, both of which are communicated by a communicating pipe, and at least one of the fluid reservoirs can be vibrated, and the communicating pipe inner wall is connected to the communicating pipe inner wall. A heat transport pipe, characterized in that boundary layer holding means for holding the stationary state of the boundary layer formed by the fluid in contact with the heat exchanger is provided.