JPS5952528B2 - capacitor device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a condenser device.

As is well known, capacitor devices, especially power capacitor devices, are widely used for phase advancement, as AC filters, or as series capacitors, but it is unavoidable that noise is generated during operation, and the level of noise depends on the rating of the capacitor. For example, the noise level at the boundary line approximately 18 meters away from the capacitor installation location is 54 to 5
It can be as high as 6db.

However, with the trend of the times, there is a strong demand for lower noise from these capacitors.

On the other hand, there are demands for capacitor devices to be larger in capacity and smaller in size, but since these are factors that increase noise, these demands conflict with the demand for reducing noise levels.

It is easy to understand that it is effective to make the entire tank double-configured, like a transformer, in order to reduce noise, but doing so inevitably increases the size and requires downsizing. Not only would this violate the above requirements, but it would also be unreasonable in terms of heat dissipation.

If heat radiation is taken into account, it is not unthinkable to provide a heat radiator, but in the case of a capacitor device, it is generally not a good idea.

The object of the present invention is to provide a simple and effective configuration for reducing noise.

In general, this type of capacitor device is constructed by having a plurality of capacitor bodies 1 arranged in an upright position side by side and housed in a container 2, and impregnated with insulating oil, as shown in FIG.

The capacitor body 1 is made of insulating paper or plastic film alone or by laminating multiple sheets of both together as a dielectric material,
It is constructed by winding electrode foil around this.

3 indicates a bushing. As understood from FIG. 1, each capacitor body 1 is arranged so that its circumferential bottom portions 1A overlap each other in the same direction.

By the way, as a result of various studies regarding the noise of a capacitor device having such a configuration, the noise distribution was measured, and a noise distribution curve (plane) as shown in FIG. 4 was obtained.

As will be understood from now on, the noise at the part facing the peripheral part 1A of the capacitor body 1 is 55 db, while the noise at the part facing perpendicularly thereto is 38 db. It is understood that the noise at the former location is high.

Normally, this kind of noise is required to be reduced to 50 db or less, so it has been found that suppressing the noise in the above-mentioned areas makes it possible to achieve the required low noise level.

Based on the above-mentioned reasons, the present invention is characterized in that a buzzing function is provided on the peripheral wall of the container facing the peripheral flat portion of the capacitor body.

Here, it is not necessary to provide the cooling function over the entire circumferential wall of the container, and as described above, only the circumferential wall facing the flat circumferential portion of the capacitor body housed inside is sufficient.

Naturally, there are two circumferential walls facing the circumferential flat portion, which face each other, but both or at least one of them may be provided with a sound function.

FIG. 2 shows an embodiment of the present invention, in which a peripheral wall 2A of the container 2 faces the peripheral flat portion 1A of the capacitor body 1.
A wall 2B is further formed on the outside of the wall 2B to form a double peripheral wall structure, and the space 5 between the side walls 2A and 2B is sealed, and air is sealed in this space 5 to form an air layer. A sound-absorbing function is provided by accommodating sound-absorbing materials such as locking fibers or textile blankets, or by creating a vacuum in this space.

If an air layer is formed, the sound passing through the peripheral wall 2A is absorbed and attenuated by the peripheral wall 2A, and is reflected by the peripheral wall 2B, reducing the amount of sound coming from the outside.

If a sound absorbing material is contained, the sound will be absorbed by this sound absorbing material, and if a vacuum layer is formed, no sound propagation will occur, and in any case, a sound effect will be produced.

The embodiment shown in FIG. 3 has a structure in which a shield wall 6 made of a steel plate or the like is installed at a distance from the peripheral wall 2A, and is fixed to the peripheral wall 2A with bolts 8 or the like.

According to this, the sound passing through the peripheral wall 2A is reflected by the pedestal wall 6, and the sound traveling outward through this is reduced.

In this configuration, a part of the sound reflected by the shingle table wall 6 is propagated in the vertical direction or the horizontal direction, but this does not pose much of a problem in practice.

The noise distribution curves shown in FIGS. 5 to 8 are experimentally determined noise effects of this invention.

Fig. 5 shows the case where an air layer is interposed in the space 5 shown in Fig. 2, Fig. 6 shows the case where a sound absorbing material (rock fiber) is similarly housed, and Fig. 7 shows the case where a vacuum layer is also interposed. 8
The figures show each case of the configuration shown in FIG. 3, and these measurement conditions were obtained under the same conditions as those for the noise distribution curve shown in FIG. 4.

As is clear from a comparison between FIG. 4 and FIGS. 5 to 8, the noise in the direction facing the peripheral flat part of the capacitor element is 55 db in the case of FIG. 49db,
It can be seen that the reduction is 45db, 30db, and 50db.

Note that the noise in the direction perpendicular to this is also reduced by 1 to 5 db, but this is thought to be due to the reduction in sound reflection.

As detailed above, according to the present invention, in order to reduce the noise of a capacitor element, it is not necessary to provide the entire circumferential wall of the container with a noise function, but only the circumferential wall facing the flat circumferential portion of the capacitor body is sufficient. Therefore, the structure for providing the noise function can be simplified and the necessary noise reduction can be achieved.Also, since the other peripheral walls are the same as before, this part will not have any adverse effect on the heat radiation effect. There are effects such as no.

[Brief explanation of the drawing]

Figure 1 is a partially opened perspective view of a conventional device, Figures 2 and 3.
The figure shows an embodiment of the present invention, and is a perspective view in a partially opened state, and FIGS. 4 to 8 show noise distribution curves in the configurations shown in FIGS. 1 to 3. 1...Capacitor body, 1A...Surrounding flat part, 2...Container, 2A, 2B...
・Peripheral wall, 5...Space, 6...Shiyadai wall.

Claims (1)

[Scope of Claims] 1. On the outside of only the peripheral wall facing the circumferential bottom portion of the capacitor body of the container that houses the capacitor body,
A container device consisting of sound walls installed at intervals. 2. The capacitor device according to claim 1, wherein an air layer is formed between the peripheral wall and the noise wall. 3. The capacitor device according to claim 1, wherein a sound absorbing material is arranged between the peripheral wall and the noise wall. 4. The container device according to claim 1, wherein the space between the peripheral wall and the noise wall is sealed, and the inside thereof is evacuated.