JPH085583Y2 - Soundproofing equipment for electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a soundproof device for electric equipment such as transformers, reactors and other induction electromagnetic equipment.

(Prior Art) In order to reduce the noise of the electric device as described above, a device in which the electric device is surrounded by a soundproof cover is already well known.

FIG. 2 shows a conventional configuration, in which the electric device 1 is surrounded by a soundproof cover 2 using an iron plate or a concrete panel, and the soundproof cover 2 is provided with a penetrating portion 8 through which a pipe 7 penetrates. The cooler 5 was connected.

And, in the structure provided with such a soundproof cover 2,
When the vibration of the electric device 1 is transmitted to the soundproof cover 2, the soundproof cover 2 itself serves as a secondary sound source, which may adversely affect the noise reduction effect.

Therefore, the vibration proof rubber 4 is provided between the electric device 1 and the base 3.
Is provided to reduce the vibration transmission of the vibration of the electric device 1 transmitted to the soundproof cover 2 through the base 3, and the labyrinth-like non-contact structure as shown in the figure where the pipe 8 penetrates the soundproof cover 2. In order to prevent noise leakage and vibration transmission to the soundproof cover 2.

Further, when the anti-vibration rubber 4 is installed between the electric device 1 and the base 3 as described above, it is necessary to have a seismic resistant structure against shaking during an earthquake. , A vibration-proof rubber 13 fixed by tightening bolts 12 was interposed to provide an earthquake-proof structure.

 In the figure, 10 is an expansion joint and 11 is a sound absorbing material.

(Problems to be solved by the invention) As described above, when the vibration-proof rubber 4 is installed between the electric device 1 and the base 3 to provide a vibration-proof structure, the part is seismic-resistant to cope with shaking during an earthquake. And need to.

In other words, since the seismic resistant structure must be installed together with the anti-vibration structure, the anti-vibration structure including the seismic resistant structure must be extremely complicated.

Further, also for the portion 8 where the pipe 7 penetrates the soundproof cover 2, it is necessary to have a labyrinthine non-contact structure in order to suppress noise leakage and prevent vibration transmission to the soundproof cover 2. There are drawbacks such as a complicated vibration damping structure.

The present invention aims at simplifying a vibration-proof construction relating to a soundproof cover in an electric device.

(Means for Solving the Problem) The present invention comprises a soundproof cover surrounding an electric device made of a damping steel plate so that the electric device is directly mounted on the base, and the soundproof cover and the pipe in the penetrating portion of the soundproof cover are arranged. It is characterized by being fixed directly by welding.

(Function) As is well known, a vibration-damping steel plate is formed by, for example, sandwiching a viscoelastic polymer material between two steel plates and crimping it. The vibration energy is absorbed by the shear deformation of the viscoelastic polymer material. To do. When the soundproof cover is made of such a damping steel plate, the vibration energy transmitted from the electric device is absorbed by this damping steel plate, so that the soundproof cover does not become a secondary sound source, and the noise reduction effect is obtained. Is not damaged.

(Embodiment) An embodiment of the present invention will be described with reference to FIG.

In addition, the same reference numerals as those in FIG. 2 indicate the same or corresponding portions. According to the present invention, the soundproof cover 2 surrounding the electric device 1 is made of a damping steel plate so that the electric device 1 is directly mounted on the base 3, and the soundproof cover 2 and the pipe 7 at the penetrating portion of the soundproof cover 2 are arranged. And were directly fixed by welding.

With this structure, the vibration energy from the electric device 1 is absorbed by the soundproof cover 2 made of this damping steel plate. As a result, the soundproof cover 2 does not serve as a secondary sound source, and the noise reduction effect is not impaired.

Therefore, it is not necessary to provide any seismic resistant structure / vibration-proof structure as shown in FIG. 2 between the electric device 1 and the base 3, and the electric device 1 can be directly mounted on the base 3, and only that structure is provided. Is simplified.

Similarly, in the welded portion of the soundproof cover 2 and the pipe 7, the vibration energy from the electric device 1 is absorbed by the soundproof cover 2 made of this damping steel plate, and the soundproof cover 2 does not serve as a secondary sound source. Moreover, since the soundproof cover 2 and the pipe 7 are welded and sealed at this penetrating portion, it is not necessary to have a complicated soundproof structure as shown in FIG. 2 against noise leakage. It will be extremely easy.

 Next, the experimental results of this device will be described.

As electrical equipment, rated 1φ, 60Hz, 13.2KV, 3000KV
For the A reactor, the noise level is 64 phons.
According to this invention, when it was surrounded by a soundproof cover made of damping steel plate, the external noise was 52 phons, and it was confirmed that the noise reduction was 12 phons.

For comparison, reactors of the same rating with noise of 68 phons were enclosed in a conventional soundproof cover made of iron plate, and with the anti-vibration structure, the noise outside was reduced to 58 phons. The noise reduction amount was 10 phons.

From the above results, the noise reduction amount can be slightly increased as compared with the conventional configuration, the seismic resistant structure can be omitted as in the conventional configuration, and it is not necessary to employ a special vibration isolation configuration.

(Effects of the Invention) As described in detail above, according to the present invention, the soundproof cover surrounding the electric device is made of the damping steel plate so that the electric device is placed directly on the base and the soundproof cover is penetrated. By directly fixing the cover and the pipe by welding, noise can be reduced, and the conventional anti-seismic structure can be omitted, and the vibration isolation structure can be made extremely simple, and the vibration isolation structure can be simplified. It has the effect of being able to.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional structure. 1: Electric equipment, 2: Soundproof cover, 3: Base, 5: Cooler, 6,7:
Plumbing

Claims (1)

[Scope of utility model registration request] 1. An electric device to be soundproofed, a cooler connected to the electric device through a pipe and an expansion joint, a soundproof cover surrounding the electric device, and a base on which the electric device and the soundproof cover are mounted. And a vibration-proof structure in which a vibration-proof rubber is interposed between the electric device and the base, and a vibration-proof structure including a vibration-proof rubber and a tightening bolt. In the soundproofing device for electric equipment, the soundproofing cover is made of a damping steel plate and the electric equipment is directly placed on the base, and the soundproofing cover and the pipe in the penetrating portion are directly welded to each other. A soundproof device for electrical equipment that is fixed.