JPS636124B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to stationary induction electric appliances, and particularly to stationary induction electric appliances such as transformers and reactors with improved noise reduction structures.

In general, as urban areas expand and residential areas are built closer to substations, there is a growing demand for lower noise levels in stationary induction appliances. Most of the noise from stationary induction electric appliances comes from vibrations generated from the iron core of the electric appliance and radiated from the tank into the atmosphere through the bottom plate and transformer oil. As a conventional measure to reduce the noise generated in this way, there is a method of insulating the noise by using a soundproof building made of concrete or iron plates. However, these methods have several drawbacks, such as an increase in the installation area of the equipment, an increase in cost, and a prolongation of the construction period.

Therefore, as a countermeasure to this problem, it has been proposed to provide a sound insulating plate between a plurality of reinforcing stays fixed to the tank side plate. In this case, in order to reduce the vibration transmitted from the reinforcing stay to the sound insulating plate, a vibration isolating device was installed between the reinforcing stay and the sound insulating plate, or a damping steel plate was used as the sound insulating plate. . However, the former method of inserting a vibration isolator between the reinforcing stay and the sound insulation board poses a problem of sound leakage from the vibration isolator, while the latter method of using a damping steel plate as the sound insulation board has a damping effect. There was a drawback in that vibration transmission increased at frequencies other than the resonant frequency.

The present invention was made in view of the above situation, and an object of the present invention is to provide a stationary induction electric appliance that can significantly reduce vibrations transmitted from a reinforcing stay to a damping steel plate and efficiently insulate noise.

The stationary induction electric appliance of the present invention is provided with a plurality of reinforcing stays fixed to the side plate of a tank housing the electric appliance main body, and a soundproofing plate made of a damping steel plate fixed between the reinforcing stays, and the above-mentioned soundproofing The plate is constructed by placing and fixing a weight body at a position separated from the reinforcing stay of the vibration damping steel plate by a predetermined distance.

A first embodiment of the stationary induction electric device of the present invention will be described below.
This will be explained with reference to FIG. FIG. 1 is a cross-sectional view, and FIG. 2 shows details of the main parts. 1 is a tank of a stationary induction appliance, and 2 is a side plate of the tank 1.
Inside the tank 1, an electric appliance body 4 consisting of an iron core 5 and a winding 6 is housed, and is filled with mineral oil 7, which is transformer oil, for the purpose of cooling and insulation. Further, a bushing 8 is provided protruding from the upper part of the tank 1, and connects the winding 6 to an external bus bar (not shown). 3 is a reinforcing stay (including all belt-like protrusions such as flanges protruding from the side plate), which is fixed horizontally to the side plate 2 at vertical positions. Note that reinforcing stays (not shown) are similarly attached in the vertical direction between the illustrated upper and lower reinforcing stays 3, 3, and a plurality of rectangular window-like portions are formed by the upper and lower reinforcing stays and the horizontal reinforcing stays.

A soundproof plate 9 is fixed between the reinforcing stays 3, 3, and the soundproof plate 9, as shown in detail in FIG. 2, has a damping steel plate 10 attached between the reinforcing stays 3, A ring-shaped weight body 12 is fixed at a position a predetermined distance from the reinforcing stay 3 on the vibration damping steel plate 10. As the damping steel plate 10, a so-called composite damping steel plate, which is made by sandwiching a viscoelastic substance between a plurality of steel plates, or an alloy damping steel plate, which itself has a damping steel effect, is used. . Soundproof board 9 configured in this way
are attached at appropriate locations between the reinforcing stays 3 of the tank 1.

Generally, electromagnetic vibrations generated in the iron core 5 are transmitted to the side plate 2 from the right side in FIG. 2 via the mineral oil 7. As a result, bending vibration occurs in the tank 1 and noise is emitted, but the magnitude of the vibration is usually
The portion of the side plate 2 where the reinforcing stay 3 is not provided is larger than the portion where the reinforcing stay 3 is provided. Therefore, a large amount of noise is generated from the portion of the side plate 2 where the reinforcing stay 3 is not provided, but most of the noise is insulated by the damping steel plate 10.
In this case, as is well known, it is also possible to put an adsorbent inside the chamber 12 to provide a sound absorbing effect. In the conventional structure, when vibration is transmitted from the reinforcing stay 3 to the damping steel plate 10, the damping steel plate 10 becomes a sounding body and the soundproofing effect is lost, so as mentioned above, a vibration isolator and a damping steel plate are used. However, it had many drawbacks.

On the other hand, in this embodiment, the damping steel plate 1
0 is attached between the reinforcing stays 3, and the weight body 11 is provided at a position away from the reinforcing stay 3, so the vibration-damping steel plate 10 between the reinforcing stay 3 and the weight body 11 acts as a spring, resulting in a vibration-proofing effect. is effectively demonstrated, the reinforcement stay 3
The vibration transmitted to the damping steel plate 10 is reduced.
On the other hand, with respect to the resonance frequency, due to the good vibration damping effect of the damping steel plate 10, it is possible to reduce transmitted vibration by converting vibration energy into thermal energy. Furthermore, because of the action of the weight body 11, there is no need to provide a vibration isolator, so the disadvantage of noise leakage from the vibration isolator as in the prior art is eliminated.

In this way, the stationary induction electric device of this example has a soundproof plate formed by attaching a weight body formed to limit vibration in combination with the vibration damping steel plate at a position away from the reinforcing stay of the vibration damping steel plate. This makes it possible to efficiently reduce noise. In other words, the damping effect of the damping steel plate and the damping effect generated by the combination of the damping steel plate's spring and the weight body act synergistically, so that the vibration is transmitted from the reinforcing stay to the damping steel plate over a wide range of frequencies. The sound insulation effect of vibration-damping steel plates can be effectively demonstrated. By effectively arranging the weight bodies, a relatively lightweight soundproof board can be constructed. In addition, with just a vibration-damping steel plate and a heavy body,
Since it is vibration-proof, there is no need for special vibration-proofing equipment, and no sound leaks from this part. Furthermore, since the heavy body is mounted indoors, the appearance is good, and the structure is simple and can be manufactured at low cost.

FIG. 3 shows another embodiment, in which the reinforcing stay 3 is also built into the soundproof board 9,
In addition to being able to reduce the noise generated from the reinforcing stay 3, this embodiment has the same effects as the above embodiment.

As described above, the stationary induction electric appliance of the present invention has a simple structure, and has the effect of significantly reducing vibration transmitted from the reinforcing stay to the damping steel plate, and efficiently insulating noise.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of one embodiment of the stationary induction appliance of the present invention, Fig. 2 is a detailed view of section A in Fig. 1, and Fig. 3 is a second embodiment of the stationary induction appliance of the invention. It is a sectional view of the same part as the figure. 1...Tank, 2...Side plate, 3...Reinforcement stay, 4...Electric appliance body, 9...Soundproof plate, 10...Vibration damping steel plate, 11...Heavy body.

Claims (1)

[Claims] 1.In a device that is provided with a plurality of reinforcing stays fixed to the side plate of a tank that houses an electrical appliance, and a soundproof plate made of a damping steel plate fixed between the reinforcing stays, the soundproof plate is A stationary induction electric appliance characterized in that a weight body is arranged and fixed at a position separated from the reinforcing stay of a steel plate by a predetermined distance.