JPS59158988A - Heat transmitter - Google Patents

Abstract

PURPOSE:To improve the cooling ability of a heat transmitter, by intermittently stopping the rotation of a rotary heat transmitter, consisting of a heat pipe. CONSTITUTION:A transmitter is used by pivoting a sealed container consisting of a straight pipe with an evaporating fluid 2 in it. When heat is applied to the heating or evaporating part 5, the heat is transmitted to the fluid 2 which adheres to the inside wall of a pipe by the centrifugal force. The steam generated by the heat moves through a steam chamber 3 by the difference of the steam pressure, radiates condensing heat and turns into liquid in a cooling or condensing part 4. When the rotation of the pipe is stopped, the condensed liquid drips along the surface of the inside wall, so that the upper part of the wall surface is always covered with thin film of condensed liquid, by which the heat resistance can be decreased to 1/5-1/10 of the rotating time. The stable performance can be maintained in the heat transmitter by braking and stopping the sealed container 1 regularly at the predetermined intervals in a rubbing part 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention J The present invention relates to a rotary heat transfer device, and particularly to a heat transfer device suitable for use in cooling a rotating electric machine.

[Background of the invention]

Figure 1 is a configuration diagram of a conventional rotary heat transfer device, and the second
The figure is a sectional view taken along the line AA' in FIG. An evaporative liquid 2 (170 liters of water, alcohol) is contained in a closed container 1 made up of a straight pipe, and is used by rotating around the axis of the closed container 1. When heat is applied to the heating section (evaporation section) IE, the heat is transmitted to the liquid 2 clinging to the inner wall surface due to centrifugal force. The steam generated by this is transferred to the steam space 3
is moved by the vapor pressure difference and reaches the cooling section (condensing section) IC L7, where it releases heat of condensation and liquefies it. , crystal closed container 1
Although the inner wall surface is not tapered from the condensing part IC to the evaporating part IE, the liquid 2 accumulated in the condensing part IC returns to the evaporating part IE due to the force of trying to keep the liquid level in the same horizontal direction. , repeating the same cycle as before.

First, the condensation heat released in the condensing part IC is transferred to the closed container 1.
Heat is removed from the outside by forced convection of air. In conventional rotary heat transfer devices, a large amount of liquid accumulates in the condensing section, and a thick film of liquid 2 is formed on the inner wall of the condensing section, resulting in an extremely high thermal resistance. becomes. For this reason, there was a drawback that cooling performance was poor.

[Purpose of the invention]

An object of the present invention is to improve the cooling performance of a rotary heat transfer device.

[Summary of the invention]

The present invention is characterized in that the rotary heat transfer device is provided with an intermittent stop device that stops the rotation as appropriate.

After conducting various heat transfer studies, we found that when the rotation of the rotary heat transfer device is appropriately stopped, the thermal resistance of the condensing section is 115 to 1 when rotating.
It was found that it could be reduced to /10. It has also been experimentally found that stable performance can be maintained if the rotating and stopping operations of the octopus are performed at predetermined intervals.

[Embodiments of the invention]

FIG. 3 shows an example for concretely realizing the present invention. 5 is a heating element, which generates heat by frictional heat, a coil, etc. 4 is a heat radiator, and radial fins, disc-shaped fins, etc. are used. 10 is a brake for stopping the heat transfer device intermittently. The brake 10 is a sealed container 1
The main body 11 is fixed independently from the main body 11, the tami coil 1 and the friction part 13 are housed therein. It is composed of a disk [4] made of a magnetic material that rotates together with the closed container 1, and a boss 15.

The disc 14 and the boss 15 are integrally connected by serrations or keys, and are movable in the longitudinal direction of the closed container 1. Therefore, electromagnetic coil 1
When human force is applied to 2, the disc 14 is attracted to the surface of the friction part 130, and the closed container 1 is braked by this friction part 1;
will be stopped. In other words, when the input to the electromagnetic coil 2 is opened or closed, the sealed container 1 is rotated and stopped. If this input opening/closing time is performed at predetermined intervals, rotation and stopping operations can also be performed at predetermined intervals.

FIG. 4 shows the state when the rotary heat transfer device of FIG. 3 is stopped, and p1 and FIG. 5 are sectional views taken along line BB' in FIG. 4. The liquid 2 in the sealed container 1 accumulates at the bottom,
The liquid 2 does not stick to the upper surface. Therefore, intense condensation occurs on the upper surface of the condensing section. Since this condensate falls down the inner wall, a thin film is always formed on the top surface.
Thermal resistance is significantly reduced.

FIG. 6 is a control circuit block diagram of the rotary heat transfer device shown in FIG. 3. Reference numerals 5 and 20 are power supply circuits, 21 is a power switching circuit including power transistors, etc., and 22 is a speed generator. A speed control circuit 23 controls the speed of the electric motor 5, which is a heating element, via the power switching circuit 21.

E is a power input, and S is a speed instruction signal.

The speed control circuit 23 controls the switching circuit 21 and the brake 10 according to the speed instruction signal S and the output of the speed generator. In this way, the electric motor 5 is started and stopped by the speed instruction signal S.

FIG. 7 shows an example of the relationship between the speed instruction S and the time T.

△t1: Rotating operation time △t2: Stopping operation time △t3
: Acceleration time △t4: Deceleration time.

△1. and Δt2 are in the range of 0.1 seconds to 60 seconds.

Desirably, Δt3 and Δt4 are in the range of 0.01 seconds to 6 seconds.

Fig. 8 shows another embodiment, and Fig. 9 shows CC' in Fig. 8.
The sectional view, FIG. 10, is a sectional view taken along line DD' in FIG. f
When the rotation of the fl closed container 1 is stopped, in the condensing section,
Since the liquid film on the upper surface falls under the influence of gravity, heat transfer performance is improved. However, in the evaporation section, it is better to always surround the entire inner wall with a liquid film in order to reduce thermal resistance and improve critical heat flux. Therefore, in this embodiment, the inner surface of the closed container 1 in the evaporation section is roughened to make it less stiff. 11 is a roughened surface.

On the contrary, it is better to polish the inner surface of the sealed container 1 at the # assembly part well to make it a smooth surface. In this way, the closed container 1 was rotating at a high speed. During the low speed rotation (symbol n') while the closed container 1 is stopped, the inner surface and the liquid 2 have already slipped in the condensing section, as shown in Fig. 8. The liquid 2 accumulates at the bottom of the closed container 1. On the other hand, in the evaporation section, since the inner surface is roughened, the liquid 2 sticks to the upper surface of the closed container 1 even during low speed rotation, as shown in FIG. Even when it has completely stopped, the liquid 2 remains attached to the upper surface of the inner wall of the closed container 1 for a while. When the degree of inward roughness is large, the effect of stirring up the liquid 2 acts, and the effect is further increased. As a roughening method, a method of oxidizing the evaporation surface may be used.

Fig. 11 shows another embodiment, p1 Fig. 12 shows E of Fig. 11.
-E' sectional view. This is the case when the inner surface of the closed container 1 is grooved. 12-a is the groove bottom.

12-b does not show a groove mountain. When the upper surface of the groove ridge 12-b is roughened, the liquid 2 is also formed on the upper surface of the groove ridge 12-b as shown in FIG.
The heat resistance in the evaporation section becomes significantly smaller.

FIG. 13 is a modification of FIG. 12. This is constructed by press-fitting scraping plates 13 into key points of the groove bottom 12-a of the evaporation section to scrape up the liquid 2 and wet the upper surface of the groove crest 12-b. FIG. 14 is a perspective view of the scraping plate 13.

FIG. 15 is a modification of FIG. 13. In the embodiment shown in FIG. 13, the scraping plate 13 is only press-fitted into the groove bottom 12-a, and it is likely to come off when force is applied. Therefore, in this embodiment, the scraping plate 13 is firmly fixed by the retaining ring 14. The retaining ring 14 and the lifting plate 13 are preferably made by stamping them as one piece as shown in FIG. 17.

FIG. 16 shows another embodiment. This is an example in which the inner wall of the closed container 1 is lined with a porous material 15 for causing capillary action. The porous material 15 is impregnated with an evaporative liquid 2, but the excess liquid 2 floats on the porous material 15. This surplus liquid 2 is placed in a container to improve the critical heat flux of the evaporation section, but as shown in FIG. In some cases, the porous material 15 on the upper surface of the evaporation section is made more flexible, and the critical heat flux is further improved.

FIG. 18 shows the relationship between the total thermal resistance of the heat pipe (the thermal resistance of the evaporating section and the thermal resistance of the condensing section) and the variable -nY-1□-(yrz/2).

The liquid filling ratio (the volume ratio of the liquid to the internal volume of the heat pipe) is an experimental result in the range of 0.2 to 0.4.

The total thermal resistance at n-Q is assumed to be 1.

When Y rises (n rises), the liquid inside the heat pipe becomes agitated, and due to the forced convection effect of -Yuzu, the total thermal resistance becomes slightly Y=
It's lower than when it was O. When Y becomes 104 or more -F, the total thermal resistance increases rapidly. This is because the liquid sticks to the entire surface of the inner wall of the condensing section, eliminating the thin group. It is preferable to design within the range of Y-1 to 104. FIG. 19 shows another embodiment in which the output shaft is separated from the main body so that the output shaft can be kept rotating at all times.

In the figure, 20 is a separated output shaft, 21 is a connecting body,
6' is a magnet 7' which is a friction part.

When the disc 8 moves in the direction of the solid arrow and is attracted by the friction portion 7, the closed container 1 stops. When the disc 8 moves in the direction of the dashed arrow and is attracted by the friction part 7', the closed container 1
rotates, and this rotational force is transmitted to the separated output shaft 20 via the coupling body 21. If the weight of the connecting body 21 is increased and it is made into a flywheel, the separated output shaft 200
The rotation speed can be kept almost constant.

〔Effect of the invention〕

As described above, the present invention intermittently stops the rotation of a rotary heat transfer device and causes the liquid clinging to the inner wall surface of the hollow container constituting the heat transfer device to fall, thereby generating condensed heat. The resistance can be significantly improved.

[Brief explanation of drawings]

FIG. 5 is a block diagram of the present invention, FIG. 6 is a diagram showing a control block, and FIG. 7 is a diagram showing control characteristics. FIG. 8 shows another example, and FIGS.
1 is another embodiment, FIG. 12 is a sectional view taken along line EE' in FIG. 11, FIG. 13 is a modification, FIG. 14 is a perspective view of the scraping plate used in FIG. 13, and FIG. 15. FIG. 16 shows a modified example.
FIG. 17 is a developed view of the scraping board used in FIGS. 15 and 16. FIG. 18 is a diagram showing the relationship between the total thermal resistance of the heat vibrator and the variable Y, and FIG. 19 is a diagram showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Airtight container, 2... Liquid, 3... Vapor space, 4... Cooler, 5... Main body, 6... Magnet, 7...
- Friction part, 8... Disc, 9... Boss, 10... Heating element, 11... Roughened surface, 12-a... Groove bottom, 12-b.
... Mizoyama, 13... Raking board, 14... Ring,
15... Porous material. 〦5j Illustration 3rd layer 4th figure No 〆 Figure, 7/) 7th row between T Yu 8 Figure Yq Figure 1-7o Figure 11, 11th illustration +z Figure JE5 舅 13 SENK FU, 4 Figure η 15 Figure Foil l Otsu Figure 5 % 17 Figure 4 Procedural amendment (method) 2. . , 5El, , 6, . 20. Commissioner of the Japan Patent Office 1, Indication of the case Patent Application No. 32725 of 1981 2 Name of the invention Heat transfer device 3 Amended party 11e1 and CI Masu N Patent applicant V, Iil, (Blo) Stock Formula N 111 σ Sou I' [Sho 4, Agent

Claims (1)

[Scope of Claims] (1) A heat transfer device that cools a heat generating part of a rotating body by utilizing the evaporation and condensation action of a liquid sealed in a cylindrical closed container that rotates together with the rotating body, A heat transfer device comprising: means for controlling the rotational speed of a rotary body; and the heat transfer performance of the heat transfer device is improved by intermittently stopping the rotation of the rotary body. 2. The heat transfer device according to claim 1, wherein the rotating body is periodically rotated and stopped within a range of 0.1 to 60 seconds.