JPS6285450A - Heat transfer apparatus - Google Patents

Abstract

PURPOSE:To reduce a pump power for circulation by composing part of an accumulator of a capillary tube material, and mainly heating condensable heat medium impregnated to the capillary material as an objective. CONSTITUTION:The first capillary tube material 21 is a first wick having fine mesh formed in contact with the walls of accumulators 6, 7, and the second capillary tube material 22 is a second wick having rough mesh formed in liquid phase in the accumulators 6, 7. The operating fluid vapor 3B of high temperature generated in a heat receiver 1 flows to a heat sink 2, is cooled to be condensed, further cooled, fluid 3A to become low temperature flows to the second accumulator 7 to be impregnated to wicks 21, 22. At this time the only fluid impregnated into the wick 21 is heated by the first heater 23 and evaporated, and the fluid in the wick 2 is not heated. Thus, the heating amount of the heater 23 may be small enough.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat transfer device used for cooling slave devices, for example.

[Conventional technology]

Generally, heat transfer devices enclose a heat transport medium in a pipe and utilize the phase change of this heat transport medium between liquid and steam. I'm trying to let it out.

FIG. 4 shows the prior heat transfer device shown in Japanese Patent Application No. 59-26743 by the same applicant. In FIG. 1, (1) is a heat receiving part, (2) is a heat radiating part, ( 3) is a heat transport medium and a condensable heat medium such as chlorofluorocarbon or methyl alcohol, that is, a working fluid. This working fluid (3)
An appropriate amount of is sealed in a loop-shaped conduit (4) with the heat receiving section (1) and the heat dissipating section (2) interposed therebetween. (5) is a blower fan provided in the heat radiating section (2) to effectively radiate heat.

(6) and (7) are the -upstream side of the heat receiving part (1) and the heat dissipating part (
A plurality of accumulators, in this example two first and second accumulators, are installed in the pipe line (4) connecting the downstream side of 2) and are piped in parallel. That is, (4A) is a pipe connecting the downstream side of the heat receiving part +1) and the − upstream side of the heat dissipating part (2), (, iB),
(40) is a conduit connecting the upstream side of the heat receiving section (1) and the downstream side of the heat dissipating section (2);
) are the first and second accumulators +61. A pipe line (8A) and a pipe line (8
B), and the pipe line (4B) on the heat radiating part (2) side connects the first and second accumulators (6), (7) and the heat radiating part (
2) is branched into a pipe line (80) and a pipe line (8D). (9) to Q3 selectively open and close the respective branched pipes (8A) to (8D), and the first. Second accumulator (6).

(9) and the decoy are the first and second on-off valves interposed in the pipes (8A) and (8B), and aυ and α2 are the pipes ( 80) and conduit (8
D) are the third and fourth on-off valves installed.

And these first to fourth on-off valves (9) to Q3 are
In order to constitute a control means for reversing the operations of the muleta (6) and f71, their opening and closing operations are interlocked with each other in a nine-order manner. That is, the first and fourth on-off valves (9),
+13 are both open, the 2nd and 3rd on-off valves are on, and the first state is that aυ are both closed; Fourth on-off valve (9), α
Both sides are closed, and the second and third on-off valves On and 01 are both open, which are alternately repeated at appropriate time intervals.

03 is the first and second accumulator (6), (7
) is a thermoelectric element that utilizes the Bertier effect as a heating and cooling means for heating and cooling. The thermoelectric element 03 and is interposed between the accumulators, one surface Q41 is in contact with the first accumulator (6), and the other surface Q41 is in contact with the first accumulator (6). It is provided so that the face opening 1 is brought into contact with the second accumulator (7). This thermoelectric element 0 can alternately generate heat and absorb heat on both surfaces I and 01 by switching the positive and negative states of the lightning current 5 to be energized. Here, switching between positive and negative is performed from the first to fourth
When the on-off valves (9) to 0 are in the first state, one surface 041 of the thermoelectric element a3 generates heat, and the other surface (19) is in the heat absorption state, and when it enters the second state, the thermoelectric element They are interlocked so that one surface OQ of a3 absorbs heat and the other surface a1 generates heat.

In the heat transfer device configured in this way, the first
When the state is set, the working fluid vapor (3B) generated in the heat receiving section (1) flows through the pipe (4A) to the heat dissipating section (2), where it is cooled and condensed. The condensed working fluid (3A) passes through a pipe (4B) and a pipe (8D), and then passes around the fourth on-off valve a.

Due to the action of flowing into the second accumulator (7), the heat absorbed by the heat receiving part (1) is transported to the heat radiating part (2). During this time, the second on-off valve α [is closed, so the pipe line (8
No steam flows directly through B). Further, the first on-off valve (9) is open, and the third on-off valve aυ is closed.

At this time, the thermoelectric element G3 has a first accumulator (
A voltage is applied to heat the second accumulator (7) and cool the second accumulator (7).

Since the internal pressure of the first accumulator (6) is higher than the internal pressure of the second accumulator (7), the difference between the first accumulator (6) and the second accumulator (7)
A driving force is generated that causes the liquid to flow in the direction of. As a result, the liquid in the first accumulator (6) flows back to the heat receiving part (1) through the pipe (8A), the first on-off valve (9) and the pipe (4). The working fluid (3) is supplied to the heat receiving part (1) at the exchange.

On the other hand, after a certain period or the accumulator (6)
, (When the first to fourth on-off valves (9) to O2 and thermoelectric element f13 are switched by detecting the liquid level in 71, heat , surface (19 is in a heat generating state. Also, the first and fourth on-off valves (
91, both H are closed, 2nd and 3rd Q) opening/closing defense, 0υ
When both are switched to the second state where they are open, evaporation 1. The working fluid vapor (31)) is liquefied in the heat radiation part (2) and then flows into the first accumulator (6).
Heat transport is carried out in exactly the same way as in the first state, except that the liquid flows back from the second accumulator (7) to the heat receiving part (1).

In this way, by switching the opening and closing of the first to fourth on-off valves (9) to aa, and switching the heat* and current of element α9,
When the working fluid (3) is refluxed to the heat receiving part (1) by 1°, the accumulators (61, +71) are switched, and the working fluid (3) can be substantially continuously returned to the heat receiving part (1).

[Problem that the invention seeks to solve]

Since the conventional heat transfer device is configured as described above,
heat! Accumulator +61. due to heating of element a3. (
To increase the pressure inside 71, the accumulator +61.
(It is necessary to evaporate the working fluid (3) in 71, but it is cooled and condensed in the heat dissipation part (2), and passes through the pipe (4B) to the accumulator (6).

The working fluid (3A) that flows back to (7) is supercooled to below the condensation temperature in the heat radiation section (2), so the working fluid (3A) that flows back to the accumulator f6
1. (It flows in at a temperature considerably lower than the temperature at which it evaporates at 71. Therefore, the amount of heating by thermoelectric element α3 is
In addition to the latent heat of vaporization that turns the liquid into vapor, an amount of sensible heat is required to raise the temperature of the liquid to the vaporizing temperature. There was a problem that a large amount of input power was required.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to obtain a heat transfer device that requires a small amount of heating to increase the pressure of an accumulator (that is, requires a small pump power).

[Means for Solving the Problems] The heat transfer device according to the present invention includes at least a portion of the accumulator made of a capillary material, and heating is performed mainly by using a condensable heat medium that has permeated the capillary material. It is something that is done to the target.

[For production]

In this invention, the pressure inside the accumulator is increased by heating the working fluid that has permeated the capillary material.
The amount of heating required to increase the pressure is smaller than heating all of the working fluid in the accumulator.

〔Example〕

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

In Figure 1, Qυ is an accumulator (6) l (7)
A first capillary material with a fine mesh, that is, a first wick, is provided in close contact with the wall of the cell.

@ is accumulator +61. a second capillary material with a coarse mesh provided in the liquid phase within +71, i.e., a second wick; g3. C141 is in close contact with the first wick Qυ and is connected to the accumulator T61. +7+ provided outside the first. Second heater, (G), ■ is accumulator +6
1. These coolers (C) and (C) are branched from the pipe line (40) on the side of the heat receiving section and are arranged in close contact with the vapor phase section of the first and second coolers (71). The pipes (8A) and (8B) are interposed in the middle of the pipes (8A) and (8B) which are connected to the second accumulator 161.+71, respectively.

Eight is the first. 2nd accumulator +61. (71) and an accumulator group device having reversing on-off valves (9) to O3.

Next, the operation will be explained. Figure 1 shows that the first and fourth on-off valves (9+, Q3 are both open, and the second and third on-off valves (In
, On are both closed, indicating the first state in which the first heater (c) is energized and generates heat, and the second heater (2) is not energized and does not generate heat. At this time, the high temperature working fluid vapor (31)) generated in the heat receiving part 0) flows through the pipe (4A) to the heat radiating part (2), where it is cooled and condensed. The fluid (3A), which is condensed and further cooled to a low temperature, passes through the pipe (4B), passes through the pipe (sl), passes through the fourth on-off valve α2, and is transferred to the second accumulator (7).
) and permeates into the wick (c). During this time, the fluid that had penetrated into the fine wick Qυ in the first agimulator (6).

It is heated by the first heater and evaporates from 1 to 1. -1) Increase the vapor pressure in the first accumulator (6). As a result, the internal pressure of the first accumulator (6) becomes higher than the pressure of the heat receiving part +1), and the fluid that has penetrated into the coarse wick in the first accumulator (6) is transferred to the heat receiving part. (1). At this time, the first heater r2
It is the fine-mesh Quick-Q that is heated and evaporated by the tank.
Only the fluid that has permeated into υ is heated, and the fluid in the coarse wick (A) is not heated, so only a small amount of heating is required by the first heater (C). In addition, by distinguishing the wick into fine wick C1)1 and coarse wick 4, the capillary force of the fine wick Qυ is greater than that of the coarse wick (C).
Fine wick 01 before coarse wick @
), and when the heater starts heating, the liquid is always present in the fine wick Qυ, which prevents so-called dry firing (IF), and the heater ■, c! 41 The reliability of pressure increase due to heating can be improved. In addition, by using a coarse wick (c), liquid can flow in and
Since the flow resistance associated with outflow can be reduced, not only can liquid flow easily into and out of the accumulator (61, (71), but also the advantage of having the same function even under zero gravity, such as in space, can be obtained. .

Next (=, the low-temperature liquid that is not directly heated and discharged from the first accumulator (6) passes through the pipe (8A) to the second cooler (to) and the first on-off valve (9). passes through and flows into the heat receiving part (1). At this time, the second cooler (
In order to cool the vapor phase in the second accumulator (7) through the second accumulator (7), the pressure in the second accumulator (7) is easily reduced.

The liquid (3A) can easily flow in from the heat radiation part (2).

Therefore, there is an advantage that cooling by the thermoelectric element (131) shown in the preceding example, that is, no electrical input for cooling is required.However, even when there are no coolers (c) and (4), Since the vapor in the accumulators (61, (7)) is cooled and condensed by the inflowing liquid (3A) and the pressure is reduced, normal operation can of course be achieved.

Next, the second. Third on-off valve 01. +III opens together,
1st. Fourth on-off valve 01. tllll closes together,
The first heater (C) does not generate heat, and the second heater C141
When the is switched to the second state in which it is energized and generates heat, heat is transported from the heat receiving part +1 to the heat radiating part (21) by the same action as in the first state.At this time, the heat radiating part (
The liquid (3A) from 2) is transferred to the first accumulator (6)
from the second accumulator (7) to the heat receiving part +1
).

By repeating the above operation, a slight heater (total),
C141 Heat will be transported from the heat receiving section (1) to the heat dissipating section (2) by human power.

In the above embodiment, the fine wick Qυ and the coarse wick (A) are shown as mesh-like ones, but as shown in FIG. 2 and a part of FIG. 2 enlarged, ,
Accumulator +61 as fine wick Qυ.
+71 A groove-shaped wick constructed by cutting thin grooves on the inner surface.
Even if a group of thin tubes formed by bundling thin tubes is used as a coarse wick, the same effects as those of the above embodiment can be obtained, as well as advantages such as ease of manufacture and high reliability.

Further, in the above embodiment, the case where the reversing on-off valves (9) to O2 are used, but the first. Second on-off valve (9+, (
Instead of II, an accumulator (6), (a check valve that opens only from 71 to the heat receiving part (1), 3rd and 4th
Instead of the opening/closing valve aυ, Q side, the accumulator is opened from the heat dissipation part (2) towards 61, +71 (reverse 1) -
Even when two valves are used, the same effect as in the second embodiment can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, at least a part of the accumulator is composed of capillary material, and heating is mainly performed.
2. Since this is performed on the condensable heat medium that has permeated into each capillary material, a heat transfer device that requires less heating for the accumulator row, that is, a smaller pump power for circulating the condensable heat medium, can be obtained. I'm worried.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the configuration of an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of an accumulator according to another embodiment of the present invention, and FIG. 3 is a portion of I■ in FIG. Enlarge l
13+ is a cross-sectional view showing the structure of the previous heat transfer device. (aA), (3B) ij, condensable heating medium, (4
1, (4A) to (4e) + (8A) to (8D) are pipes, (5) is a fan, (61, +71 are 1st and 2nd accumulators, (9) to 03 are on-off valves, α3 is two thermoelectric elements, Qυ is the first capillary material, @ is the second capillary material, c!3
．． (241 is the 1st. 2nd (7) H-1, J cah
iI, second cooler; Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (4)

[Claims] (1) A heat receiving section, a heat dissipating section, and an accumulator group device are connected in order, and a condensable heat medium is sealed inside to form a circulation path,
The accumulator group device has at least a first accumulator, a second accumulator, and a reversing on-off valve;
By heating the condensable heat medium in the accumulator to increase its vapor pressure, the condensable heat medium is refluxed to the heat receiving section, and the condensable heat medium in the heat radiating section is caused to flow into the second accumulator, and the In a heat transfer device that repeatedly switches heating from a first accumulator to a second accumulator and reverses the operation of the first accumulator and the second accumulator by the action of the reversing on-off valve,
A heat transfer device characterized in that at least a portion of the accumulator is made of a capillary material, and the heating is performed mainly on a condensable heat medium that has permeated the capillary material. (2) Heat transfer according to claim 1, in which a first capillary material with a fine mesh and a second capillary material with a coarse mesh are used as capillary materials to heat the condensable heat medium that has permeated the first capillary material. Device. (3) Claim 2 in which a groove-shaped capillary material formed by cutting grooves on the inner surface of the accumulator is used as the first capillary material.
Heat transfer device as described in section. (4) The heat transfer device according to claim 2 or 3, in which a group of capillary tubes formed by bundling capillary tubes is used as the second capillary material.