JPH0772676B2 - Method of filling working medium into heat pipe - Google Patents

Description

The present invention relates to a method for filling a heat pipe with a working medium.

"Prior Art" Conventionally, after exhausting from the inside of a heat pipe by a vacuum pump, the liquid-phase working medium is metered and quantitatively supplied to the heat pipe to seal it.

[Problems to be Solved by the Invention] According to the conventional method, since the liquid-phase working medium is supplied to the heat pipe while being measured, the difference in measurement is large, and the filling amount of the working medium between the heat pipes of the same use is large. The variation increases.

Further, when exhausted from the heat pipe, impurities inside the pipe are also exhausted at the same time, but for example, when the heat pipe container is a copper pipe, even if it is degassed, oxygen molecules, hydrogen molecules and other Impurities remain attached, and such residual impurities tend to cause unstable operation.

A first object of the present invention is to provide a method for filling a working pipe with a working medium in which variations in the amount of the working medium filled are smaller.

It is a second object of the present invention to provide a working medium filling method capable of producing a heat pipe with more stable operation.

[Means for Solving the Problems] In order to achieve the above-mentioned first object, the first filling method according to the present invention is characterized in that the step of exhausting from the heat pipe and the measurement of the working medium in the gas phase are performed. A step of sending the working medium to the heat pipe side and condensing the working medium to supply a fixed amount to the heat pipe.

In order to achieve the above-mentioned object, the second filling method according to the present invention evaporates the working medium in the heat pipe after the final step of the first filling method and discharges a part of the working medium while measuring it. It is characterized by having a process.

It is preferable that the vapor-phase working medium discharged from the heat pipe while being evaporated is collected in the collection tank while being condensed.

In the method of the invention, a mass flow meter is used to measure the working medium in the gas phase.

In addition, while feeding the working medium in the gas phase to the heat pipe side while metering the working medium, in the step of quantitatively supplying the working medium to the heat pipe while condensing the working medium, the working medium is sequentially fed to a large number of heat pipes, In the process of evaporating the working medium in the heat pipes and discharging a part of the working medium, the working medium is sequentially discharged from the large number of heat pipes after the supply of the working medium to all the heat pipes is completed in the previous process. It is preferable to configure so that

[Operation] In the first filling method according to the present invention, when the working medium is supplied to the heat pipe, the working medium in the vapor phase is vaporized and supplied while being measured. Since the working medium in the phase is significantly expanded compared with the working medium in the phase, the metering error is much smaller than that in the case where the working medium in the liquid phase is metered.

According to the second filling method, the working medium once supplied to the heat pipe and in the liquid phase is distilled by discharging a part of the working medium in an evaporated state, and remains in the heat pipe. Oxygen gas, hydrogen gas and other impurities present are discharged from the heat pipe by this distillation.

Therefore, the purity of the working medium is further increased.

"Example of apparatus for carrying out the method of the present invention" Fig. 1 is a piping diagram showing an example of an apparatus for carrying out the method of the present invention.

Many heat pipes HP1, HP2-HPn are valves V1, V2-Vn
Is connected to the first exhaust pipe 1 and the supply pipe 2 via. A valve V3 is provided near the heat pipe side of the first exhaust pipe 1, and a valve V4 is provided near the heat pipe side of the supply pipe 2.

The first exhaust pipe 1 is provided with a valve V5 and a flow meter F1 and is connected to a bypass pipe 11 having a valve V6. The exhaust pipe 1 is connected to an exhaust pump 6 via a valve V10.

A flow meter F2 is provided in the middle of the supply pipe 2, and the supply pipe 2 is connected to a working medium supply tank 4 via valves VV7 and V8.

The tank 4 has a water-cooling type cooling means 41 in the upper part and a heater 42 in the lower part, and is connected to the exhaust pump 6 via the valves V8, V9, the second exhaust pipe 5 and the valve V10. There is.

At the position where the valve 10 of the exhaust pipes 1 and 5 is sandwiched, the valve
The recovery tank 7 is connected via V11 and V12, and a cooling means 71 is provided above the recovery tank 7.

In the example of this device, a bellows valve is used for each valve, a mass meter is used for the flow meters F1, F2, and a dry exhaust pump is used for the exhaust pump 6.

"Example" In this example, the heat pipes HP1 to HPn have an inner diameter of 16
mm, wall thickness 0.7 mm, capacity 600 copper tube, working medium is Freon 113 (boiling point 48 ° C.), initial filling amount of working medium to heat pipe is 35 g, final filling amount is 30 g.

The pipes 1, 2, and 5 are connected by heating means such as a heater (not shown).
It is heated to about ℃ to prevent the vapor-phase working medium flowing inside from condensing.

Only the valve V12 is opened in advance, and the exhaust tank 6 exhausts air from the recovery tank 7.

The working medium in the tank 4 for supplying the working medium is evaporated by the heating (55 ° C.) of the heater 42, and the cooling means at the upper part of the tank 4
Condenses by 41. Oxygen, nitrogen and other impurities are accumulated in the upper part of the tank 4 by distillation, so valves V8, V9, V1
When 0 is opened and other valves are closed, these impurities are occasionally discharged by the exhaust pump 6.

First, the valves V1, V2, Vn, V3, V6, V10 are opened, the other valves are closed, and the exhaust pump 6 is operated to heat the heat pipes HP1 to HPn.
Exhaust from inside.

Next, only the valves V1, V4, V7, V8 are opened, and 35 g of the gas-phase working medium in the tank is supplied into the heat pipe HP1 through the supply pipe 2 while being measured by the flow meter F2 on the way. Then, close the valve V1 and open the valve V2 to set the heat pipe HP.
The same amount of working medium is supplied into 2, and the same amount of working medium is sequentially supplied to the last heat pipe HPn by the same valve operation.

The gas-phase working medium supplied to each of the heat pipes HP1 to HPn is cooled by the respective water-cooling type cooling means 81 to 8n provided at the upper part of these heat pipes, and each heat pipe HP1 to HPn while being condensed. Supplied within HPn.

The heating means 91 to 9n provided below the heat pipes HP1 to HPn evaporate the working medium in these heat pipes. In this state, valves V3, V5, V1
By opening only 0, V11 and sequentially opening and closing valves V1, V2, Vn, the evaporated working medium in the heat pipes HP1 to HPn is metered by the flow meter F1 while measuring 5 g through the first exhaust pipe 1. Collected one by one into the recovery tank 7. Then, the heat pipes HP1 to HPn are sealed.

In this way, by distilling the working medium in the heat pipes HP1 to HPn, oxygen molecules, hydrogen molecules and other irregular substances remaining in the heat pipes HP1 to HPn are discharged.

The working medium recovered in the recovery tank 7 is condensed in the tank 7 by the upper cooling means 71. If a predetermined amount or more of working medium is accumulated in the recovery tank 7, the valve
V11 and V12 are closed, valves V13 and V14 are opened, and an inert gas or the like is introduced into the recovery tank 7, whereby the working medium in the recovery tank 7 is pumped into the tank 4 through the pipe 3.

According to the above procedure, 15 heat pipes were filled with the working medium, but the error of the working medium filling amount between each heat pipe was within ± 0.5 g, and the heat pipe with more stable characteristics was manufactured with high productivity. We were able to.

For example, when the working medium is Freon 113, 1 mol = 119 cc in the liquid phase state and 1 mol = 22400 cc in the gas phase state, while flowing Freon 113 of both phases in separate pipes, For example, when measuring in units of several cc to 10 cc, the latter measurement accuracy is much higher. By the way,
Although 30 g of Freon 113 is about 1/6 mol, in the gas phase state, it can be measured in units of several cc by a mass flow meter, for example.

When supplying the working medium in the vapor phase to the heat pipe while condensing it, instead of providing cooling means on the upper part of the heat pipe as described above, for example, cooling not shown in the upper pipe near the heat pipe It can also be implemented by providing an accumulator and cooling at this portion.

"Effect of the Invention" According to the filling method of the present invention, since it is possible to fill the heat pipe while measuring the working medium with extremely high accuracy, there is a variation in the filling amount of the working medium between the heat pipes of the same use. Much smaller than the method.
Therefore, a more homogeneous heat pipe can be manufactured.

[Brief description of drawings]

FIG. 1 is a piping diagram showing an example of an apparatus for carrying out the method of the present invention. DESCRIPTION OF SYMBOLS IN THE MAIN FIGURES 1 is a first exhaust pipe, 11 is a bypass pipe, 2 is a supply pipe, 4 is a working medium supply tank, 5 is a second exhaust pipe, 6 is an exhaust pump, and 7 is Recovery tanks, V1 to Vn are valves, HP1 to HPn are heat pipes, and F1 and F2 are flow meters.

Claims (3)

[Claims] 1. A step of exhausting air from the inside of a heat pipe, and feeding a working medium in a gas phase to the heat pipe side while measuring
And a step of quantitatively supplying the working medium to the heat pipe while condensing the working medium, the method for filling the working medium into the heat pipe. 2. The working medium filling method according to claim 1, wherein after the step of quantitatively supplying the working medium to the heat pipe while condensing the working medium, the working medium in the heat pipe is evaporated and a part thereof is evaporated. A method of filling a heat pipe with a working medium, the method comprising discharging while measuring. 3. A step of feeding a working medium in a vapor phase to the heat pipe side while measuring the working medium and supplying the working medium to the heat pipe while condensing the working medium in a fixed amount, the working medium is sequentially supplied to a large number of heat pipes. However, in the step of evaporating the working medium in the heat pipe and discharging a part of the working medium while measuring it, after the working medium has been supplied to all the heat pipes in the previous step, the working medium is removed from the large number of heat pipes. The method for filling a working medium with a heat pipe according to claim 2, wherein the heat medium is sequentially discharged.