JPS5930498Y2 - soundproof transformer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a soundproof transformer with an improved soundproof structure.

A conventional soundproof transformer will be explained with reference to FIG.

The contents of a transformer in which a winding 2 is wound around an iron core 1 are stored in a main body tank 4 together with insulating oil 3.

This main body tank 4 is housed in a soundproof tank 5 having a sound absorbing material 7 attached to the inner surface and having an opening at the top.

In this case, a plurality of vibration-proofing materials 8a are placed on the bottom plate of the sound-proofing tank 5.
, and place the main tank 4 on top of it.

On the other hand, the upper opening of the soundproof tank 5 is closed by extending the cover 6 provided on the upper part of the main body tank 4 outward and attaching it to the upper peripheral edge of the soundproof tank 5, so that the cover 6 is shared.

A gasket 9 is interposed between the upper flange of the main body tank 5 and the cover 6 and sealed by fixing with a plurality of tightening bolts 11, and a gasket 9 is provided between the upper peripheral edge of the soundproof tank 5 and the cover 6. In order to absorb dimensional errors between the main body tank 4 and the soundproof tank 5, a low-density elastic body 10 such as foamed rubber is interposed.

Note that 13 is a bushing provided on the cover 6, and 14 is a heat radiator.

By the way, in the above-mentioned conventional soundproof transformer, if the center of gravity of the main body tank 4 and the arrangement of the vibration isolating material 8a are even slightly shifted, the main body tank 4 will be tilted and an appropriate receiving pressure load will not be applied to the vibration isolating material 8a.

In such a case, there is a drawback that variations occur in the vibration transmissibility of the vibration isolating members 8a on the sides, the vibration damping performance decreases, and the noise from the bottom plate of the soundproof tank 5 increases.

Furthermore, since the main body tank 4 and the soundproof tank 5 are in contact with each other through the vibration isolating material 8a at the lower part and through the elastic body 10 at the upper part,
Each of them had to be manufactured with high dimensional accuracy and had the disadvantage of being expensive.

On the other hand, a structure in which the soundproof tank 5 is built on a separate foundation from the main tank 4 is also adopted, but this requires high precision in on-site foundation construction and also requires actual assembly work, which reduces installation work costs. It had the disadvantage of being expensive.

The present invention was made to eliminate the above-mentioned drawbacks, and the object is to provide an inexpensive soundproof transformer that can obtain excellent vibration and soundproof effects without complicating the structure.

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

The contents of the transformer, in which a winding 2 is wound around an iron core 1, are stored in a main body tank 4 together with insulating oil 3.

The main body tank 4 is internally sealed by interposing a gasket 9 between a cover 6 provided at the top and the upper flange of the main body tank 4 and fixing it with a plurality of tightening bolts 11, and the cover 6 is used to seal the entire body. can be hung.

This main body tank 4 has a size with an appropriate interval from this, and is housed in a soundproof tank 5 having an opening at the top.

The cover 6 of the main tank 4 extends outward to close the upper opening of the soundproof tank 5 and share the cover, but there is a dense barrier between the cover 6 and the upper peripheral edge of the soundproof tank 5. A vibration isolating material 8b such as a vibrating rubber is interposed, but no vibration isolating material is interposed between the bottom plate of the main body tank 4 and the bottom plate of the soundproof tank 5.

Thereby, the main body tank 4 has a structure in which the entire weight is supported by the vibration isolating material 8b on the upper peripheral edge of the soundproof tank 5.

In this way, the soundproof tank 5 and the main tank 4 are almost separated, and the only solid propagation path is from the main tank 4 through the cover 6 to the soundproof tank 5.

Moreover, this propagation path has a vibration isolating material 8b interposed in the middle thereof, and the cover 6 supports the main tank 4 so as to be able to move up and down, forming a kind of spring system. The amount of vibration propagated to the soundproof tank 5 can be significantly attenuated.

In addition, by completely separating the bottom plate of the soundproof tank 5 and the bottom plate of the main tank 4, there is no solid propagation path created by the conventional vibration-proofing material, and the soundproof tank 5 has a structure in which not only the inner surface but also the inner surface of the bottom plate is provided. Since the sound absorbing material 7 can be attached to absorb the noise emitted from the side surface and bottom plate of the main tank 4, the transmission of noise to the soundproof tank 5 can be further reduced.

Furthermore, since the main body tank 4 is supported in a suspended state on the soundproof tank 5, high dimensional accuracy is not required for each of the main body tank 4 and the soundproof tank 5, and therefore manufacturing becomes easy and inexpensive.

In addition, the vibration isolating material 8b is made of a continuous material with a constant thickness.
Its width is determined so that an appropriate load from the main body tank 4 is applied.

Further, if the center of gravity of the main body tank 4 is shifted to one side, the left and right widths are made different depending on the ratio, and the pressure load received by the vibration isolator 8b is adjusted so as to be always constant.

As mentioned above, in the soundproof transformer of the present invention, it is possible to obtain good vibration and soundproofing effects, and since the structure in which the main tank is suspended by the soundproof tank is adopted, the dimensions of the main tank and the soundproof tank are It has advantages such as not requiring particular precision and being easy to manufacture and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional soundproof transformer, and FIG. 2 is a sectional view of a soundproof transformer showing an embodiment of the present invention. 1...Iron core, 2...Winding, 3...
...Insulating oil, 4...Main tank, 5...
・Soundproof tank, 6...Cover, 7...
Sound absorbing material, 8 a, 8 b... Vibration isolating material, 9...
...Gasket, 10...Elastic body, 11.
...Tightening bolt.

Claims (1)

[Scope of utility model registration request] The main tank, which stores the contents of the transformer and insulating oil inside, is housed in a soundproof tank having an opening at the top, and a cover provided on the top of the main tank is extended outward to open the top of the soundproof tank. A soundproof transformer, characterized in that a vibration isolator is interposed between the upper peripheral edge of the soundproof tank and the cover, and the entire weight of the main tank is supported through the vibration isolator. vessel.