JPS6131605B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to stationary induction electric appliances such as transformers and reactors, and particularly to a soundproofing device for reducing noise generated from the tanks thereof.

Recently, as urban areas have expanded and residential areas have been built closer to substations, there has been an increasing demand for low noise static induction appliances. Most of the noise from stationary induction appliances comes from magnetostrictive vibrations generated in the iron core of the appliance, which radiate from the tank into the atmosphere through the bottom plate and insulating oil.

Soundproofing measures using concrete and steel plates have traditionally been used as noise countermeasures.
In this method, electrical equipment is placed inside a soundproof building made of concrete or iron plates to insulate or absorb sound. However, this method had various drawbacks, such as an increase in the installation area of the equipment, a prolonged construction period, and an increase in costs.

In addition, by providing a frame made of elastic material such as rubber around the peripheral edge of the reinforcing stay and supporting the sound insulation flat plate with this,
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There are ways to prevent the noise coming from the side panels of the tank.
Although this method can easily and efficiently achieve noise reduction, the spring constant of the elastic body must be made very small in order to sufficiently reduce the vibrations transmitted to the sound insulating flat plate. However, it is not practical due to restrictions on the free length of the elastic body and earthquake resistance problems, and there are also problems with the weather resistance of rubber, reliability, and cost.

Therefore, the inventors of the present invention have recently proposed a method in which a thin plate with a predetermined spring constant is used as the elastic body and a weight body is placed near the thin plate attachment part of the sound insulation flat plate (Japanese Patent Application No. 163476/1989). issue). According to this method, the vibration damping effect can be achieved with a spring constant within a practical range due to the action of the weight body, and since a thin steel plate or the like is used, disadvantages in terms of weather resistance, reliability, and cost can be overcome.

However, when welding together a relatively thin steel plate like a sound insulating flat plate and a heavy block, the sound insulating flat plate becomes warped due to welding strain.
It had the drawback of partially melting off, which became a manufacturing bottleneck. A method of using rivets and screws as a fixing means is also considered, but there is still a problem in terms of reliability.

SUMMARY OF THE INVENTION An object of the present invention is to provide a stationary induction electric appliance that eliminates the drawbacks of the above-mentioned soundproofing device and can provide a good connection between a heavy body and a soundproofing flat plate.

In order to achieve this object, the present invention is characterized in that a protrusion is provided on the weight body, and the protrusion is welded to the sound insulating flat plate.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, a tank 1 used for a stationary induction appliance is constructed of a side plate 2 and a plurality of reinforcing stays 3 fixed to the side plate 2 by welding. Inside the tank 1, an electric appliance main body 4 consisting of an iron core 5 and a winding 6 is housed, and is filled with mineral oil 7 for the purpose of insulation and cooling. Furthermore, a bushing 8 is attached to the upper part of the tank 1, and connects the winding 6 to an external bus bar (not shown). A soundproof plate 9 is attached between the reinforcing stays 3.

In addition, in FIGS. 2 and 3, the soundproof plate 9
A thin plate 10 made of a thin steel plate and having a predetermined spring constant is fixed to the peripheral end of the reinforcing stay 3, and a side plate 2 is tightly attached to the thin plate 10 and fixed by welding or the like.
It consists of a sound insulating flat plate 11 made of a steel plate provided to form a chamber 12 between the sound insulating flat plate 11 and an annular weight body 13 attached to the outer peripheral edge of the inner surface of the sound insulating flat plate 11, that is, near the boundary between the thin plate 10 and the sound insulating flat plate 11. Such a soundproof plate 9 is attached to an appropriate location between the reinforcing stays 3 of the tank 1.

FIG. 4 is a detailed view of section C in FIG. 3. A protrusion 14 is integrally formed on the weight body 13, and the protrusion 14 is connected to the sound insulating flat plate 11 by spot welding (resistance type) 15.

When the protrusion 14 is provided on the weight body 13 in this way and the protrusion is connected to the sound insulating flat plate 11 by spot welding 15, the sound insulating flat plate 11 is bonded to the sound insulating flat plate 11 at the joint.
Since the difference in heat capacity between the sound insulating plate 11 and
A smooth and good joint can be obtained without distortion or chipping.

Next, the operation of the soundproof board configured as described above will be explained. The magnetostrictive vibrations generated in the iron core 5 are transmitted to the side plate 2 from the right side of FIG. 3 via the mineral oil 7. As a result, bending vibration occurs in the tank 1, but the magnitude of the vibration is generally larger in the portion of the side plate 2 where the reinforcing stay 3 is not provided than in the portion where the reinforcing stay 3 is provided. Therefore, the noise generated from the portion of the side plate 2 where the reinforcing stay 3 is not provided is large, but most of the noise is insulated by the sound insulating flat plate 11. In this case, it is also possible to put a sound absorbing material inside the chamber 12 to provide a sound absorbing effect, as is well known.

Now, when vibrations are transmitted from the reinforcing stay 3 to the sound insulation flat plate 11, the sound insulation flat plate 11 becomes a sounding body and the sound insulation effect is lost. Therefore, the sound insulation flat plate 11 is supported by a thin plate 10 having a predetermined spring constant. This prevents vibration from being transmitted, but as mentioned above, the thin plate 1
Since the spring constant of 0 cannot be made sufficiently small due to static deflection, etc., the vibration transmitted from the reinforcing stay 3 is large. Therefore, if a weight body 13 is provided near the attachment point of the thin plate 10, the force transmitted from the thin plate 10 will be countered by mass, so even if the thin plate 10 with a practical spring constant is used, the effect on the sound insulating flat plate 11 will be reduced. Vibration transmission can be prevented. Therefore, noise reduction can be achieved by sound insulation and prevention of vibration transmission.

According to this embodiment, the following effects can be obtained.

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(1) Since the protrusion 14 is provided on the weight body 13 and the protrusion 14 is welded to the sound insulation flat plate 11, the weight body 13 can be joined to the sound insulation flat plate 11 without causing distortion or chipping of the sound insulation flat plate 11. can.

(2) Since the weight body 13 is joined to the sound insulating flat plate 11 by welding, reliability can be improved.

(3) For the same reason as (2) above, it is aesthetically better than when using studs and screws.

(4) Since the weight bodies 13 are effectively arranged, an excellent soundproofing effect can be obtained with a spring constant within a practical range.

(5) For the same reason as in (4) above, a relatively lightweight soundproof board 9 can be obtained.

(6) Since the thin plate 10 made of steel plate is used, weather resistance and reliability are improved.

(7) For the same reason as in (6) above, it is possible to obtain an economically superior soundproof board 9.

(8) Since the weight body 13 and the sound insulating flat plate 11 are provided inside the chamber 12, the appearance is good.

(9) For the same reason as in (8) above, dust does not easily accumulate on the soundproof board 9.

In the above embodiment, the protrusions 14 are provided at two locations on the weight body 13, but the invention is not limited to this, and it is also possible to provide the protrusions 14 at an appropriate number of locations, for example, to connect the weight body 13. .

As explained above, according to the present invention, the protrusion is provided on the heavy body and the protrusion is welded to the sound insulating flat plate, so that the heavy body can be easily attached to the sound insulating flat plate without causing distortion or chipping of the sound insulating flat plate. Can be combined.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing the overall structure of a stationary induction appliance according to an embodiment of the present invention, and FIG.
The arrow view, Figure 3 is a sectional view taken along line B-B in Figure 2, and Figure 4 is
The figure is a detailed view of section C in FIG. 3. DESCRIPTION OF SYMBOLS 1...tank, 2...side plate, 3...reinforcement stay, 4...electric appliance body, 10...thin plate with a predetermined spring constant, 11...sound insulating flat plate, 12...chamber, 13
... Weight body, 14 ... Protrusion, 15 ... Spot welding part. 〓〓〓〓

Claims (1)

[Claims] 1. A stationary induction electric appliance in which a plurality of reinforcing stays are provided on the side plate of a tank that houses an electric appliance body, and a sound insulating flat plate is supported on the reinforcing stays via an elastic body,
A stationary induction electric appliance, characterized in that a weight body having a protrusion is disposed near the elastic body mounting portion of the sound insulating flat plate, and is welded to the sound insulating flat plate at the protrusion. 2. The stationary induction electric appliance according to claim 1, wherein the welding between the protrusion of the weight body and the sound insulating flat plate is spot welding. 3. The stationary induction electric appliance according to claim 1, wherein the weight body is provided over the entire vicinity of the elastic body mounting portion of the sound insulating flat plate. 4. The stationary induction electric appliance according to claim 1, wherein the weight body is disposed in a chamber formed between the side plate and the sound insulating flat plate. 5. The stationary induction electric appliance according to claim 1, wherein the elastic body is made of a thin plate having a predetermined spring constant.