JPS634924B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a device for cooling transformer oil.

Conventionally, as this type of cooling device, a radiator type cooling device shown in FIG. 1 and a heat pipe type cooling device shown in FIG. 2 are known. That is, in the radiator type cooling device shown in FIG. 1, a radiator 4 is attached to the outside of a container 3 containing transformer oil and a transformer 2, and a fan 6 rotated by a motor 5 is arranged opposite to the radiator 4. The transformer oil 1 is air-cooled by circulating the transformer oil 1 between the radiator 4 and the container 3 and blowing air to the radiator 4 by a fan 6. Furthermore, the heat pipe type cooling device shown in FIG. A large number of fans 8 are attached to the end to form an air cooling section 9,
Furthermore, a fan 6 rotated by a motor 5
is arranged to face the air cooling section 9, heat of the transformer oil 1 is carried to the air cooling section 9 by the heat pipe 7, and air is blown into the cooling section 9 by the fan 6, thereby cooling the transformer oil 1. It is configured for indirect air cooling.

However, since both of the cooling devices shown in FIGS. 1 and 2 are mechanisms in which the air cooling fan 6 is driven by the motor 5, the electric power or energy for operating the fan 6, that is, the motor 5, is not supplied to the outside. Since the transformer oil 1 has to be supplied from the source, running costs increase, and if the power supply to the motor 5 is stopped for some reason, there is a risk that the transformer oil 1 will hardly be cooled.

This invention was made to solve the above problems, and its purpose is to provide a cooling device that can continuously cool transformer oil without applying external energy. The feature is that the heat pipe is partially inserted into the transformer oil and has an annular shape as a whole, and a check mechanism allows the working fluid to flow in only one direction.The turbine is rotated by the gas-phase working fluid. An air cooling fan, which is provided inside the heat pipe and rotated by the turbine device, is arranged to face the air cooling part formed in a part of the heat pipe, thereby utilizing the thermal energy of the transformer oil. The point is that a part of the air cooling fan is used to operate the air cooling fan.

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

Reference numeral 10 in FIG. 3 is a heat pipe, and the heat pipe 10 is formed into an annular shape as a whole by connecting both ends thereof, and a part of the heat pipe 10 is inside the container 3 containing the transformer oil 1 and the transformer 2. The heating section 11 is inserted into the container 3 in the vertical direction.
Further, a large number of fans 12 for heat radiation are attached to a predetermined location of the heat pipe 10 located outside the container 3, and this is used as an air cooling section 13. The area between the air cooling part 13 and the air cooling part 13 is formed to have a large diameter, and the area from the lower part of the air cooling part 13 to the heating part 11 is formed to have a small diameter. A wick 14 made of a metal net or the like is attached to the inner peripheral surface between the heating section 11 and the lowermost part thereof. Therefore, in the heat pipe 10, the large diameter section from the heating section 11 to the air cooling section 13 serves as a flow path for the gas-phase working fluid, and the small diameter section from the air cooling section 13 to the heating section 11 serves as a flow path for the liquid phase working fluid. It is considered to be a waterway for water use.

A check valve 15 is provided inside the heat pipe 10 above the heating section 11, and the check valve 15 pushes the valve body 16 against the valve seat 17 below it by means of a spring 18. The heating section 1 has a configuration that allows the gas-phase working fluid to flow only from the bottom to the top in FIG.
Coupled with the large flow resistance to the gas-phase working fluid in the small diameter section below the heating section 11, the gas-phase working fluid only flows upward from the heating section 11. Therefore, the check valve 15 And the small diameter portion serves as a check mechanism.

Further, a turbine device 19 is arranged above the check valve 15 and is rotated by a gas-phase working fluid. This turbine device 19 is, for example, of a radial flow type, and is installed so that its rotation axis 20 is perpendicular to the streamline of the gas-phase working fluid, that is, faces in the radial direction of the heat pipe 10. Furthermore, an air cooling fan 21 facing the air cooling section 13 is disposed with respect to the turbine device 19, sandwiching the wall surface of the heat pipe 10. The rotating shaft 20 of the turbine device 19 and the air cooling fan 2
The rotating shaft 22 of 1 is the magnetic coupling 2
3 in a non-contact manner.

Next, to explain the operation of the cooling device configured as described above, the working fluid in the heat pipe 10 receives heat from the transformer oil 1 and moves to the heating section 1.
In contrast, the gas-phase working fluid radiates heat and condenses in the air cooling section 13, so the heating section 1
1 becomes higher than the pressure in the air cooling section 13, and the flow resistance to the gas phase working fluid in the small diameter section below the heating section 11 is large, so the gas phase working fluid generated in the heating section 11 is
The check valve 15 is pushed open, and the air flows toward the air cooling section 13 via the turbine device 19. In that case, since the gas-phase working fluid passes through the turbine device 19 at subsonic or supersonic speed, the turbine device 19 rotates, and its rotational force is transmitted to the air cooling fan 21 via the magnetic coupling 23. As a result, the air cooling section 13 is forcedly cooled by the air cooling fan 21. The working fluid, which is cooled in the air cooling section 13 and condensed as a result, flows down the liquid-phase working fluid channel under its own weight and reaches the lowest part, and then reaches the heating section 11 by the capillary action of the wick 14. It gets sucked up. The working fluid that has returned to the heating section 11 is heated again and evaporated, and thereafter flows in the same manner as in the case described above.

Therefore, in the above cooling device, the fan 21 for forced air cooling can be operated by the kinetic energy of the gas phase working fluid, that is, the thermal energy of the transformer oil 1 to be cooled. There is no need to apply energy, and the fan 21 can be continuously operated while the transformer oil 1 is heated by the transformer 2 and needs to be cooled.

Note that the present invention is not limited to the above-mentioned embodiments, and the device for circulating the liquid-phase working fluid to the heating section may be provided as necessary. For example, the device may be provided on the entire inner circumferential surface of the heat pipe. It's okay.
Further, the turbine device and the air cooling fan may not be connected by a magnetic coupling, but may be directly connected in their respective rotations.

As is clear from the above description, according to the cooling device of the present invention, the heat pipe, which is partially inserted into the transformer oil and has an annular shape as a whole, is configured so that the working fluid flows only in one direction using a check mechanism. , a turbine device rotated by a gas-phase working fluid is provided in the heat pipe, and
Since the air cooling fan rotated by the turbine device is placed facing the air cooling part formed in a part of the heat pipe, the air cooling fan is cooled by the kinetic energy of the gas phase working fluid. Therefore, according to the cooling device of the present invention, there is no need to specifically supply energy from the outside, so running costs can be reduced to almost nothing. If the transformer oil is high enough to be cooled, cooling can be continued.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a conventional cooling device;
FIG. 2 is a schematic diagram showing another example of a conventional cooling device;
FIG. 3 is a schematic diagram showing an embodiment of the present invention. 1...Transformer oil, 10...Heat pipe, 1
1... Heating section, 13... Air cooling section, 15... Check valve, 19
...Turbine device, 21...Air cooling fan.

Claims (1)

[Claims] 1 A part of the heat pipe which has an annular shape as a whole is inserted into the transformer oil by connecting both ends, and a check mechanism is provided in the heat pipe so that the working fluid flows only in one direction. , and a turbine device rotated by the gas-phase working fluid is arranged in the heat pipe on the downstream side in the flow direction of the gas-phase working fluid with respect to the part of the heat pipe that is inserted into the transformer oil; An air cooling fan rotated by a turbine device is arranged to face an air cooling section provided on the downstream side in the flow direction of the gas-phase working fluid from a portion of the heat pipe where the turbine device is provided. Transformer oil cooling system.