JPS62241315A - Sound-proof induction electric apparatus - Google Patents

Abstract

PURPOSE:To decrease vibration transmitted from a mainframe of oil filled induction electric apparatus to an oil vessel and to ensure optimum sound-proof efficiency by providing inside the oil vessel with a vibration absorption plate composed of softer metal in comparison to a side plate of oil vessel and also composing a compressible fluid with the aid of welding a pressured layer in advance. CONSTITUTION:A thin plate of an oil side 2 shall be 1-2 mm or less of a thin ordinary steel sheet or 2-4 mm or less of a thin copper sheet which is to be soft enough in terms of pressure vibration. Since a thick plate at an air side 5 shall be an intensified member to be capable of withstanding internal or external pressures which are required for an oil vessel, it strength shall be several times that of the thin plate. Both of plates are partially plug welded each other and such side plates are partially or entirely applicable for composing the oil vessel. Even though vibration of an induction apparatus mainframe 1 makes its pressure rise between the mainframe and the oil vessel 3, its appli ance permits vibration to transmit to a vibration absorption plate 4 and also to absorb its vibration in the air layer 5 thereby decreasing drastically vibration of the oil vessel 3.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a soundproof oil-filled induction electric appliance.

Conventional technology] The conventional RIT installation consists of installing a gas system in the rc'li' unit and the oil tank [+J several σ] as described in Japanese Utility Model Publication No. 41-23779, and installing a sound-absorbing material in the oil with built-in air bubbles. Attempts have been made to reduce sound pressure through methods such as this, but none of them can withstand long-term use or be put to practical use as high-voltage equipment. Therefore, we had no choice but to select specifications that would allow us to hear the R-Kouta resonance and make it even larger.

[Problem that the invention seeks to solve]

For the purpose of the present invention, T is mainly placed on the air side as a strength member against internal pressure or external pressure required for an oil tank.
Is it made up of an original plate with a layer of thin plates inside which can contain an EEm injection fluid to alleviate pressure rise? Part of it.

It can also be applied to all lights and can withstand long-term use.

It is also applicable to high voltage equipment. Each plate is made of metal, and the plates are overlapped by welding.

[Means for solving problems]

The above purpose is to significantly reduce the pressure by transmitting the pressure vibration between the main unit and the oil tank due to the vibration of the IT equipment body to the compressed injection fluid through the thin plate on the oil side, and to reduce the vibration of the oil tank and therefore the light noise. This can be achieved by using a metal plate (T).

[Effect]

Thin & on the oil side is a thin ordinary steel plate of 1 to 2 strands or less.

Alternatively, it should be made of a thin copper plate having a size of 2 to 4 fl or less, which is sufficiently soft against pressure vibrations.

The thick plate on the live air side is several times as strong as the thin plate (B) because it is a strong member against the internal pressure or external pressure required for the oil tank.

Partially weld both bases using welding, etc. It is also possible to partially bath-bond a sound-absorbing material with 173 JIlt of air bubbles in advance and solder to the earthen floor.

Weld the entire thin plate to Tsusaji and apply pressure between the plates to create #kei (
Slightly tilt III with the partial welding point as the fulcrum. The bulge should be below the shikibe.

1411 & constructed in this way can be used as an oil tank in part or in a residential area.

With the above configuration, hydraulic vibrations are absorbed by the air layer between the plates, and transmission to the outside of the oil tank is significantly reduced.

For convenience of explanation, the thin plate will be used as a vibration absorbing plate.

〔Example〕

An embodiment of the present invention will be explained below with reference to the first example. The vibration of the induction electric device main body 1 causes a pressure increase between it and the oil tank 3, and depending on one condition, it may resonate with the frequency of the vibration. Therefore, the vibration transmitted to the vibration absorbing plate 4 is absorbed by the compressible air #5, and the vibration of the oil tank 3 can be significantly reduced.

The vibration absorbing plate 4 and the oil tank 3 are welded all around, and the vibration absorbing plate 4 is partially welded at an appropriate pitch in the middle. Apply pressure to the air in advance.

Further, a spacer made of a sound absorbing material containing air bubbles may be provided between the vibration absorbing plate 4 and the oil tank 3.

This pitch, spacer, etc. will naturally vary depending on the specifications of the 4-piece.

〔Effect of the invention〕

According to the present invention, the vibration transmitted from the oil-filled tlV4 portable body to the oil 40 by hydraulic pressure propagation can be significantly reduced, so that a soundproofing effect of 5 to 10 phons can be achieved compared to the conventional one.

[Brief explanation of drawings]

Claims (1)

[Claims] 1. In an oil-filled induction electric appliance, a vibration absorbing plate made of a metal softer than the side plate of the oil tank is provided on the inner surface of the oil tank, and a layer in which a compressible fluid is pre-pressurized is welded to the inner surface of the oil tank. A soundproof induction appliance characterized by comprising: