JPS6266094A - Heat exchanger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a heat exchanger, and in particular, to a heat exchanger suitable for use in a deployable radiator for an artificial satellite, which is folded during transportation and unfolded when used. Regarding the exchanger.

[Background of the invention]

A conventional deployable radiator, as described in Japanese Utility Model Application Publication No. 60-5999, has a structure in which heat from the heat source is transported to the radiator section using a flexible heat pipe in order to cool the heat source. However, when a flexible heat pipe is used in the deploying mechanism of a deployable radiator, the deploying mechanism becomes large due to the restriction on the bending radius of the flexible heat pipe. Furthermore, since the flexible heat pipe is composed of bellows or the like, there is a risk of leakage of the heat pipe heat medium.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a heat exchanger for a deployable radiator that has a rotating mechanism that can be used in a deployable radiator such as a deployable radiator for an artificial satellite, is small, and is free from leakage. .

[Summary of the invention]

In the deployable radiator, it is only necessary that heat from the heat source can be efficiently transported to the radiator after the radiator section is deployed. Therefore, in the expandable radiator heat exchanger of the present invention,
A pipe for high-temperature fluid from the heat source and a pipe for low-temperature fluid from the radiator section are installed adjacent to each other, and although heat transfer between the pipes is poor before the radiator is deployed, the pipes do not rotate or rotate relative to each other. It has a movable structure.

After the radiator is deployed, the adjacent pipes are brought into close thermal contact with each other by a material with high thermal conductivity, thereby ensuring good heat transfer between the pipes. .

Therefore, in the heat exchanger for a deployable radiator of the present invention, since there is no need to use a bellows, the deployment mechanism of the deployable radiator can be made smaller and the possibility of leakage is reduced.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3. FIG. 1 is a sectional view showing the structure of the heat exchanger of the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG. FIG. 3 is a schematic diagram of an artificial satellite equipped with a deployable radiator using the heat exchanger of the present invention shown in FIG.

In FIG. 3, high-temperature fluid pipes 2 and 3 from heat sources (not shown) in the satellite body 1 are connected to heat exchangers 4 and 3, respectively.
, 5 transfers heat to the cryogenic fluid vibro, 7, and
Heat is radiated by the radiator section 8.9. Pumps 10, 11 circulate fluid. Note that FIG. 3 shows the state after development.

FIG. 1 shows a sectional view of the heat exchanger 4. FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1. In FIG. 1 and FIG. . Furthermore, a space 23 is provided between the metal blocks 21 and 22, and a container 24 is provided connected to this space 23. Inside this container 24 is a solid high thermal conductivity material 25.
, for example, metal sodium is enclosed. Furthermore, a heater 26 is provided around the container 24 to melt and evaporate the high thermal conductivity substance 25.

The high-temperature fluid pipe 2 is integrally formed with a metal block 21, and the low-temperature fluid vibro is integrally formed with a metal block 22.

The operation of this embodiment will be explained below. Before the radiator section 8 is deployed, the space 23 is not filled with the high thermal conductivity material 25 . Therefore, the high-temperature fluid pipe 2 and the low-temperature fluid vibro are relatively rotatable. Radiator section 8
f. After development, the high thermal conductivity material 25 is melted and evaporated by the heater 26. The vapor of the high thermal conductivity substance 25 is transferred to the container 2
It adheres to the wall of the space 23, which is kept at a lower temperature than 4, and solidifies. , thus the high thermal conductivity material 25 in the container 24
moves into the space 23 and fills the inside of the container 24, increasing the heat transfer coefficient between the metal blocks 21 and 22.

Therefore, the high-temperature fluid pipe 2 and the low-temperature fluid vibro can be rotated relative to each other before the radiator section 8 is deployed, and after the radiator section 8 is deployed, it becomes a high-performance heat exchanger.

FIG. 4 is a sectional view showing another embodiment of the heat exchanger of the present invention. In this embodiment, the high-temperature fluid pipe 2 in FIG. 1 was replaced with heat pipes 31 and 32, and the low-temperature fluid vibro was replaced with heat pipes 33 and 34. The other structure is basically the same as the embodiment shown in FIG. With this configuration, it is possible to eliminate the need for the pump 10 (FIG. 3) for completely circulating the fluid.

FIG. 5 is a sectional view showing another embodiment of the heat exchanger of the present invention. In Figure 5, heat pipe 4 from the heat source
1 and the heat pipe 42 from the radiator section, one end of each is inserted into the metal block 43, and the heat pipe 41, 42 and the metal block 43 are inserted into the metal block 43.
A space 23 is provided between them, and this space 23 is filled with a powdery or granular solid high thermal conductivity substance 25 . Further, the heat pipe 41 is connected to a metal block 43.
However, the heat pipe 42 is rotatable. Heat pipes 41 and 4 are installed inside the metal block 43.
A cylindrical space 44 is provided so as to surround 2, and a condensable heat medium is sealed inside the cylindrical space 44. Therefore, the metal block 43 itself can also operate as a heat pipe.

Powdered or granular solid high thermal conductivity material 2 in space 23
5 is completely melted by the heater 26 after the radiator section is expanded. , the molten bale is naturally cooled and solidified by turning off the heater 26. Since the solidified high thermal conductivity material 25 is in close contact with the heat pipes 41 and 42 and the metal block 43, a high heat transfer rate can be ensured between the heat pipes 41 and 42.

In this embodiment, since the heat pipes 41 and 42 are arranged coaxially, it is possible to further downsize the metal block 43, and since the metal block 43 itself is used as a heat pipe, a high heat transfer coefficient can be ensured.

The metal block 43 is made of a shape-memory alloy and is memorized so that it contracts when heated by the heater 26, thereby improving the adhesion with the high thermal conductivity material 25 and also making the metal block 43 more compact around the heat pipe 42. It can be used as reinforcement for the stop.

〔Effect of the invention〕

According to the present invention, a portion of the heat transport path can be completely rotated while the heat medium is sealed inside the pipe without using a flexible pipe, which has the effect of reducing the risk of leakage of the heat medium. Furthermore, since there is no restriction on the bending radius of flexible pipes such as bellows, it is possible to downsize the deployable mechanism such as the deployable radiator.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the heat exchanger of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. FIG. 4 is a sectional view showing another embodiment of the present invention, and FIG. 5 is a sectional view showing still another embodiment of the present invention. 1...Satellite body, 2.3...Pipe for high temperature fluid, 6.7...Pipe for low temperature fluid, 10.11...Pump, 21.22...Metal block, 23...・Space, 26... Heater, 43... Metal block.

Claims (1)

[Claims] 1. A space provided between a high-temperature fluid pipe and a low-temperature fluid pipe in a heat exchanger that brings the high-temperature fluid pipe and the low-temperature fluid pipe into thermal contact to cool the high-temperature fluid or heat the low-temperature fluid. a solid substance with high thermal conductivity disposed in the space, a heat source for melting the solid substance, and a cooling means for cooling and solidifying the molten substance with high thermal conductivity. A heat exchanger comprising: