JPH04316989A - Mercury sealing device for mercury heat pipe - Google Patents

Abstract

PURPOSE:To seal only mercury having a high purity into a heat pipe and obtain a mercury heat pipe, not mixed with air, by a method wherein the mercury in a mercury vessel is heated and evaporated under vacuum condition to shift and seal the evaporated mercury into the heat pipe through a vacuum pipeline. CONSTITUTION:When mercury 5 is sealed into a heat pipe, the heat pipe 2 is evacuated by a vacuum pump 4 at first, then, a valve 11B is closed and another valve 11A is opened to blow magnesium 8 in an adding agent vessel 9 into the heat pipe 2 to seal it. Next, the valve 11B is opened and the heat pipe 2 and a mercury vessel 1 are evacuated by a vacuum pump 4. Subseequently, the mercury vessel 1 is heated by a heater 6 to evaporate the mercury 5. Then, the evaporated mercury 5 is shifted into the heat pipe 2 through a vacuum pipeline 3. Accordingly, the level of the mercury vessel 1 is lowered accompanied by the shifting of the mercury 5 and, therefore, the sealing amount of the mercury into the heat pipe 2 is measured by a level meter 7. Thereafter, the valve 11B is closed and the shifting as well as the sealing of the mercury 5 are finished.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mercury sealing device for a mercury heat pipe used in an FBR reactor direct cooling system (DRACS) or the like.

0002

[Prior Art] Conventionally, as shown in Fig. 2, a mercury enclosing device for a mercury heat pipe measures the amount of mercury required for enclosing.
A vacuum pump 4 and a valve 1 communicate the inside of the heat pipe 2 with it.
A device is used in which the mercury in the mercury container 1 is evacuated into a vacuum and the mercury in the mercury container 1 is sealed into the heat pipe 2 in a liquid state by the pressure difference with the atmosphere or by the weight of the mercury.

0003

SUMMARY OF THE INVENTION The conventional mercury sealing device for a mercury heat pipe has the following problems to be solved.

That is, mercury is used as a working medium in heat pipes that are used at high temperatures and have high heat transport performance, but mercury has poor wettability with substances such as metals and does not wet the inner walls of heat pipes. There is a problem that the performance of the heat pipe cannot be demonstrated.

[0005] This is because there is minute dirt such as oxides on the inner wall of the heat pipe. To remove this dirt, the heat pipe is baked at high temperature or a reducing agent such as magnesium is added to the inner wall of the heat pipe. It removes dirt.

[0006] However, even if the above treatment is carried out, in conventional devices, mercury comes into contact with air and envelops the air, so air gets mixed into the heat pipe when mercury is sealed, and the inner wall becomes contaminated again. was there.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mercury sealing device for a mercury heat pipe that solves the above-mentioned problems and does not allow air to enter.

[0008]

[Means for Solving the Problems] The present invention provides a mercury container connected to a mercury heat pipe by a vacuum piping whose passage can be opened and closed, and a mercury container whose passage is connected to the vacuum piping so that its passage can be opened and closed. An object of the present invention is to provide a mercury enclosing device for a mercury heat pipe, comprising a magnesium container, a heater for evaporating mercury attached to the mercury container, a vacuum pump, and a level meter for measuring the amount of mercury. It is something to do.

[0009]

[Operations] Since the present invention is constructed as described above, it has the following functions.

[0010] The inside of the mercury container, the heat pipe, and the vacuum piping connecting these are evacuated by a vacuum pump,
By heating the mercury container, the mercury turns into vapor, and due to the pressure difference between the vapors, the mercury vapor passes through the vacuum piping and fills the heat pipe. Since the heat pipe is allowed to cool naturally, mercury vapor condenses and liquefies inside the heat pipe.

[0011] As a result, mercury is transferred from the mercury container into the heat pipe as steam. The amount transferred is monitored and measured using a level meter attached to the mercury container.

Magnesium flowing from a magnesium container connected to the vacuum piping so that the passage can be opened and closed is sealed in the heat pipe in advance, so that it fuses with the transferred mercury and removes oxides on the inner wall of the heat pipe. This improves the wettability of mercury to the inner wall.

[0013]

[Embodiment] An embodiment of the present invention will be explained with reference to FIG. Note that members similar to those in the conventional example are denoted by the same reference numerals, and explanations thereof will be omitted.

FIG. 1 is a schematic side sectional view of this embodiment, in which a mercury container 1 and a heat pipe 2 are connected by a vacuum pipe 3 with a valve 11B interposed therein, and a valve 11C is connected to the upper space inside the mercury container 1. It is configured to be evacuated by a vacuum pump 4 connected to the pump. The mercury container 1 is equipped with a heater 6 that heats and evaporates the mercury 5 and a level meter 7 that monitors and measures the amount of mercury. An additive container 9 into which magnesium 8 is injected is connected to the vacuum pipe 3 via a valve 11A. The mercury container 1 and the vacuum pipe 3 are coated with a heat insulating material 10 such as fine flex having a heat resistance of 500° C. or higher and having a thickness of about 50 mm.

In the above structure, mercury is enclosed in the following procedure. The inside of the heat pipe 2 is moved by the vacuum pump 4.
A negative pressure of about 0.5 kg/cm2 G is created, the valve 11B is closed and the valve 11A is opened, and magnesium 8 is blown into the heat pipe 2 and sealed. Next, open the valve 11B, and connect the heat pipe 2 and mercury container 1 to 1×10-3T using the vacuum pump 4.
Create a high vacuum state below orr. Next, the mercury container 1 is heated to 500° C. or higher using the heater 6 to evaporate the mercury 5. As a result, the evaporated mercury 5 passes through the vacuum pipe 3 and moves into the heat pipe 2. Since the heat pipe 2 is naturally cooled in the atmosphere, mercury vapor condenses within the heat pipe 2 and returns to liquid.

As the mercury (steam) moves, the level in the mercury container 1 decreases, so the amount of mercury sealed in the heat pipe 2 can be determined by the level meter 7.

When the specified amount of mercury has been transferred, the valve 11B is closed and the transfer and inclusion of mercury is completed. As described above, according to this embodiment, the heat pipe 2 and the mercury container 1 are connected by the vacuum piping 3, the vacuum pump 4 evacuates the system, and the heater 6 is used to vacuum the mercury container 1. Since the mercury is evaporated, transferred into the heat pipe 2, and liquefied, there is no opportunity for air to flow into the heat pipe 2, so there is an advantage that the inner wall of the heat pipe 2 is not contaminated. Further, since the additive container 9 is connected to the vacuum pipe 3 and the magnesium 8 is made to flow into the heat pipe 2 in advance, there is an advantage that the wettability of the inner wall of the heat pipe 2 is improved.

[0018]

[Effects of the Invention] Since the present invention is configured as described above,
It has the following effects.

That is, by heating and evaporating mercury in a vacuum, transferring it as vapor, and enclosing it, only high-purity mercury can be enclosed in the mercury heat pipe. does not occur.

Furthermore, by enclosing magnesium, the wettability of mercury to the inner wall of the heat pipe can be improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic side sectional view of a mercury enclosure device for a heat pipe according to an embodiment of the present invention.

FIG. 2 is a schematic side sectional view of a conventional example.

[Explanation of symbols]

1 Mercury container 2
heat pipe 3
Vacuum piping 4
vacuum pump 5
mercury 6
Heater 7
level meter 8
Magnesium 9
Additive container 10
Heat insulation material 11A,
11B, 11C valve

Claims (1)

[Claims] Claim 1: A mercury container connected to a mercury heat pipe by a vacuum piping whose passage can be opened and closed, a magnesium container whose passage is connected to the vacuum piping so that its passage can be opened and closed, and a method for evaporating mercury attached to the mercury container. A mercury enclosing device for a mercury heat pipe, characterized in that it is equipped with a heater for heating the mercury, a vacuum pump, and a level meter for measuring the amount of mercury.