JPS6157989B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe type cooling device that cools an object to be cooled by putting a refrigerant into a pipe and moving the refrigerant back and forth.

Conventionally, OF cable lines generally have an oil passage along the line, and oil tanks are provided at both ends of this oil passage.
The oil pressure inside the cable is maintained at a desired oil pressure through an oil passage from this oil tank. In such a cable line, if the oil pressures of the oil tanks at both ends are different, oil flows through the oil passage. At this time, if the temperature of the oil is low, the oil passage will be cooled, and in turn the cable will be cooled. However, in order to perform such cooling, a pressure regulating device is required to adjust the oil pressure in the oil tank at both ends, and a cooling device is also required to cool the flowing oil.

In view of this, the present invention has devised a pipe-type cooling device that does not require a special pressure regulating device.A pipe filled with a refrigerant is placed near the object to be cooled, and the position is heated at both ends of the pipe. Alternatively, a cooling heat exchanger is connected, and the heat exchanger creates a temperature difference between both ends of the pipe, creating a difference in the vapor pressure of the refrigerant at both ends of the pipe, and this pressure difference causes the refrigerant to flow back and forth between the pipes. It is characterized by moving the object to be cooled.

Next, this will be explained in more detail based on the drawings.
FIG. 1 shows an example of a pipe-type cooling device according to the present invention, in which heat exchangers 2 _{and 1} are installed at both ends of a single pipe 1 (or a combination of multiple pipes).
and 2 ₂ are connected, and the pipe contains water, fluorocarbons,
A refrigerant 3 such as ammonia or alcohol is sealed. The pipe 1 is placed near an object 7 to be cooled, such as a connection 6 of a power cable 5. water, freon,
The equilibrium vapor pressure curve of a liquid such as ammonia is generally as shown in FIG. 2, and the ratio of pressure change Δp to temperature change Δt is very large.

For example, the relationship between water temperature and pressure is as follows: Temperature Pressure °C mmHg 0 4.6 30 31.8 50 92.5 60 149.4 70 233.7 90 529.9 100 760.0, and the pressure changes with temperature changes are large. Therefore, the heat exchanger ₂₁ is now cooled to lower the temperature _T1 at the pipe end ₃₁ (at this time, the vapor pressure of the refrigerant is
_P1 ), while the other heat exchanger ₂₂ does not heat or cool the pipe end ₃₂ to make the temperature _T2 higher than the temperature _T1 (the vapor pressure of the refrigerant at this time is _P2 ). For example, T ₁ <T ₂ and P ₁ <<P ₂ , which causes a difference in the vapor pressure of the refrigerant at both ends of the pipe, so the refrigerant 3 in the pipe 1
flows from the heat exchanger ₂₂ side to the ₂₁ side. The refrigerant flowing into the heat exchanger ₂₁ is cooled there. Next, if the cooling conditions of heat exchangers 2 ₁ and 2 ₂ are reversed, T ₁
>T ₂ , therefore P ₁ >>P ₂ , and the refrigerant 3 in the pipe 1 flows from the heat exchanger 2 ₁ side to the 2 ₂ side.
When the heat exchangers ₂₁ and ₂₂ create a temperature difference between the two ends of the pipe and a difference in vapor pressure of the refrigerant at both ends of the pipe, the refrigerant 3 in the pipe 1 is reciprocated, and the object to be cooled is It is cooled down. In order to reciprocate the refrigerant in the pipe 1, as mentioned above, one of the heat exchangers connected to both ends of the pipe 1 is cooled, and the other is not cooled, even if a pressure difference is created, one is cooled and the other is not cooled. Even if one is heated without further cooling the other, the same pressure difference will occur and the refrigerant will move back and forth. In Figure 1, 4
₁ and 4 ₂ are heat exchangers 2 ₁ and 2 ₂ respectively
This shows a heat dissipation device.

Next, examples of the present invention will be shown.

Heat exchangers 2 ₁ and 2 ₂ each having a reservoir with an internal volume of 10 are connected to both ends of a copper pipe with a diameter of 50 mm and a length of 10 m. Freon 12 is sealed in the pipe as a refrigerant, and one heat exchanger 2 ₁ is operated. The other heat exchanger 2 was cooled to 10℃, and the other heat exchanger ₂ was cooled to room temperature (temperature approx. 30℃).
℃), the pressure difference was 500 mmHg, and the refrigerant flowed from the heat exchanger ₂₂ side to the ₂₁ side. Next, heat exchanger 2 ₂ was operated, and when 2 ₁ was stopped and left for about 10 minutes, the refrigerant flowed in the opposite direction to the above.
The copper pipe was cooled by the refrigerant, and the objects around the copper pipe could be cooled.

As explained above, according to the present invention, a pipe filled with a refrigerant is arranged near the object to be cooled, a heat exchanger for heating or cooling the position is connected to both ends of the pipe, and the pipe is heated or cooled by the heat exchanger. By creating a temperature difference between the two ends of the pipe, a difference is created in the vapor pressure of the refrigerant at both ends of the pipe, and this pressure difference causes the refrigerant between the pipes to reciprocate and cool the object to be cooled. There is an advantage that the cable can be easily cooled by providing the device along the cable installation pipe that is the object to be cooled, or by using a pipe inserted into the cable.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of a pipe type cooling device according to the present invention. FIG. 2 is a diagram showing a vapor pressure curve of a liquid. 1...Pipe, 2 ₁ , 2 ₂ ...Heat exchanger, 3...
...refrigerant in pipe 1.

Claims (1)

[Claims] 1 A pipe filled with refrigerant is placed near the object to be cooled, a heat exchanger is connected to both ends of the pipe to heat or cool the position, and the heat exchanger creates a temperature difference between the ends of the pipe. A pipe type cooling device characterized by creating a difference in the vapor pressure of refrigerant at both ends of the pipe, and causing the refrigerant between the pipes to reciprocate due to this pressure difference.