JPS6398112A - Electromagnetic induction apparatus - Google Patents

Abstract

PURPOSE:To improve the heat dissipation effect of a radiator by blowing air to the radiator by sucking and discharging air by the change of pressure when bellows which are repeatedly expanded or contracted by the vibration of the main body of an electromagnetic induction apparatus and are installed in the apparatus are expanded and contracted. CONSTITUTION:When a transformer is operated, a bottom plate 4 is also vibrated by the vibration of the iron core of the main body of the transformer. The vibration repeatedly increases or reduces the pressure of bellows 8 via a case 11. Accordingly, the bellows 8 carry out a pumping operation by the repeated increase or reduction of the internal pressure of the bellows 8. This strengthens the heat dissipation effect by the natural convection around a radiator 2 by the blow of air forcibly to the bottom of the radiator 2 and the cooling capacity of the transformer is increased.

Description

[Detailed description of the invention] (Industrial application field) This invention relates to electromagnetic induction equipment.

(Prior Art) Electromagnetic induction equipment, such as a transformer, is constructed by housing the transformer body in a tank together with a cooling medium such as insulating oil or insulating gas. The transformer body is usually located at the bottom of the tank. By the way, magnetostrictive vibrations occur in the core due to alternating magnetic flux passing through the core of the transformer body. Therefore, a part of the supplied power is wasted as wasted vibration energy.

This vibration is also transmitted to the tank directly via the cooling medium or indirectly via other components. This causes the tank to vibrate and generate noise. To reduce this noise, measures have been taken such as using vibration-proofing materials, covering the tank with a soundproof wall, and increasing the amount of iron core used to lower the magnetic flux density. However, all of these methods only encourage larger equipment, which is extremely uneconomical.

(Problems to be Solved by the Invention) This invention recovers a part of the generated vibration energy and uses it to improve the heat radiation efficiency of a radiator for cooling a cooling medium, and also absorbs vibration energy. The purpose is to reduce the vibration of equipment.

(Means for solving the problem) This invention is a bellows that repeatedly expands and contracts due to vibrations of the electromagnetic induction device when the electromagnetic induction device is housed in a tank together with a cooling medium. The bellows sucks in and discharges air due to the pressure change when it expands and contracts, and blows the air out to the radiator for cooling the cooling medium, thereby increasing the heat radiation effect of the radiator. It is characterized by being made to increase.

(Example) This invention will be explained using figures. The figure shows an example of a transformer, and 1 is a tank, in which the main body of the transformer is housed together with a cooling medium such as insulating oil. Reference numeral 2 denotes a heat radiator for the cooling medium, which is connected to the upper and lower parts of the tank 1 via a pipe 3, and is cooled while the cooling medium in the tank 1 circulates.

4 is the bottom of the tank 1, on which the transformer body is installed. The bottom plate 4 is fixed to the installation surface 6 via the base 5 with anchor bolts or the like. These structures are not particularly different from conventional ones.

According to this invention, a bellows unit 7 is arranged between the bottom plate 4 and the installation surface 6. This bellows unit 7 is
One or more bellows 8 in the shape of a disc made of metal
It is equipped with A check valve 9 is connected to the inlet thereof, and its tip is open to the outside. A check valve 10 is connected to the outlet, and its tip is open facing the lower part of the radiator 2.

Bellows 8 is arranged between a pair of cases 11.

To hold the bellows 8, a collecting plate 12 is used as shown in FIG. The figure shows a case where two bellows 8 are used, and a ring 13 is fixed to the collecting plate 12, and the periphery of the bellows 8 is supported between the rings 13 with a buffer material 14 interposed therebetween. .

The cases 11 are installed so that they can freely vibrate with each other.

Specifically, a guide pin 15 is inserted into the end of the case 11, and a nut 16 is provided at the bottom of the guide pin 15 to prevent it from coming off. The case 11 is able to vibrate vertically using the guide pin 15 as a guide. 17 is a dehumidifier that dehumidifies the air sucked by the bellows 8 as described later.

When the transformer is operated with the above configuration, the bottom plate 4 also vibrates due to the vibration of the iron core of the transformer body. This vibration repeatedly pressurizes and depressurizes the bellows 8 via the case 11. Therefore, the internal pressure of the bellows 8 increases and decreases repeatedly.

When pressurized here, the air inside the bellows 8 is discharged to the outside, and when the pressure is reduced, the restoring force of the bellows 8 and the elastic force of the residual compressed air are added, and the inside of the bellows 8 and the piping on the inlet side are Air in the piping on the inlet side is sucked into the bellows 8 due to the pressure difference.

By repeating the above operations, the bellows 8 performs a pumping action. Since check valves 9 and 1o are provided on the inlet and outlet sides of each bellows 8, air will not flow backwards.

Due to such a pumping action of the bellows 8, air is forcibly blown upward into the lower part of the radiator 2. Therefore, the upward current of air around the radiator 2 increases, and the heat radiation effect due to natural convection is strengthened. As a result, the cooling capacity of the transformer can be increased.

On the other hand, the vibration of the iron core of the transformer body is absorbed by the bellows 8 as described above, so the bellows 8 has the same effect as a conventional vibration isolator, causing the vibration of the tank 1 and the noise of the transformer. It has the effect of reducing

Although the bellows 8 in the above embodiment was disk-shaped, a cylindrical bellows 8 may be used instead, as shown in FIG. 4. FIG. 5 shows a bellows unit 7 constructed using this cylindrical bellows 8. Further, in order to increase the restoring force of the bellows, a compression spring or the like may be provided inside.

In the above embodiment, the bellows unit 7 is connected to the bottom plate 4 of the tank 1.
In this example, it was installed at the bottom of tank 1, but as shown in Figure 6,
It may be provided on the side wall 18 of. Like the bottom plate 4, the side wall 18 also vibrates due to the vibration of the transformer body. Therefore, in the figure, a reinforcing member 19 fixed around the side wall 18 is used. That is, the pedestal 2 is straddled between adjacent reinforcing members 19.
0 is fixed and used in place of the installation surface 6 in FIG.

The bellows unit 7 is installed in the space between the reinforcing members 19.

Note that the air outlet of the bellows 8 does not necessarily need to be provided at the bottom of the radiator 2; for example, it can be installed at any location in the gap between the heat radiating units that make up the radiator 2, in areas where the temperature is locally high, or where it is difficult for natural convection air to circulate. Of course, it may be provided at a suitable location.

(Effects of the invention) As detailed above, according to this invention, in electromagnetic induction equipment, the invalid vibration energy that inevitably occurs due to power transformation is recovered and used to cool the cooling medium of the radiator. Since the cooling efficiency of the radiator is increased, the noise generated from the equipment can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a sectional view of a bellows unit, and FIG. 3 is a partially enlarged sectional view.
FIG. 4 is a side view of a bellows showing another embodiment of the invention, FIG. 5 is a sectional view of a bellows unit using the bellows of FIG. 4, and FIG. 6 is a side view of a bellows unit showing another embodiment of the invention. FIG. 1...Tank, 2...Radiator, 4...Bottom plate, 7...
・Bellows unit, 8...Bellows,

Claims (1)

[Claims] In an electromagnetic induction device that includes a main body of the electromagnetic induction device stored in a tank together with a cooling medium and a radiator for cooling the cooling medium, the electromagnetic induction device repeatedly expands and contracts based on vibrations of the main body of the electromagnetic induction device. A bellows unit equipped with a bellows is provided, and air is sucked in from the outside by changes in internal pressure when the bellows of the bellows unit expands and contracts, and the air is blown out toward the radiator for cooling. Electromagnetic induction equipment.