JPH0218908A - Gas-filled electric apparatus - Google Patents

Abstract

PURPOSE:To reduce noises radiated from a gas blower, a connecting tube, etc., by allowing a sound absorber to adhere to the tube, and covering the blower with a soundproof plate. CONSTITUTION:Connecting tubes 21, 22 with sound absorbers are provided at the suction and discharge sides of a gas blower 3, and the blower and its driving device 3 are respectively covered with soundproof plates 23a, 23b. Thus, the plates 23a, 23b reduce noises generated from the blower, the device by sound generated due to pressure change occurring by the fact that the blades of the blower 3 cross the gas, the tubes 21, 22 with the sound absorbers absorb the sound generated from the blower and sound due to the vortex of gas flow to largely reduce noises radiated from the tube 4, gas cooler 2 and a transformer tank 1.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a low-noise gas-filled electric appliance, and in particular to noise emitted from a gas blower and a gas cooler attached to the gas-filled electric appliance. Regarding noise reduction structure.

(Conventional technology) For disaster prevention reasons, non-flammable gas is used as insulation and cooling medium in places where the damage would be severe if a fire were to occur, such as in urban areas, underground of buildings, or inside tunnels. The sealed electrical appliance 1, for example, a gas-filled transformer, is increasingly being used.

The filling gas used in this gas-filled transformer is generally SF (sulfur hexafluoride) gas, which is also used in gas-sealed switchgear because of its excellent insulation properties. be. Although SF and gas have excellent insulating properties, their cooling performance is inferior to that of insulating oil, and in cooling by natural convection, when the pressure of the sealed gas is atmospheric pressure, the cooling capacity is reduced to about 178 times that of insulating oil.

Therefore, in the case of a gas-filled transformer with a capacity exceeding 3000 VA, a method is often used to increase the cooling capacity by forcibly circulating gas inside the transformer.

A gas blower is required to force the gas to circulate, and a gas cooler is installed to cool the gas.

A conventional gas-filled transformer of this type is shown in a plan view in FIG. 3 and in a side view in FIG.

A gas cooler 2, a gas blower 3, connection pipes 4, 5.6 including flexible pipes, and a gate valve 7 are connected to the transformer tank 1. The tank 1 is also provided with high and low pressure bushings 8 and 9, respectively, and pockets 10 and 11 for housing them. The gas coming out of the transformer tank 1 is transferred to the upper connecting pipe 4. It is configured to circulate through the gas cooler 2, passing through the intermediate connecting pipe 5, the gas blower 3, and the lower connecting pipe 6 in this order, and returning to the transformer tank 1.

(Problem to be solved by the invention) In recent years, prevention of noise pollution has been strongly discouraged, and it is necessary to reduce the noise of transformers installed in power generation and substations, regardless of whether they are in urban areas or mountainous areas. It has become to.

In the conventional gas-filled transformer described above, the noise emitted from the gas blower 3 and the gas transmitted through the gas cooler 2
, the connecting pipes 4, 5, 6, and the transformer tank 1 emit a large amount of noise, and it is necessary to reduce these noises. As a noise reduction measure, it is common to surround the transformer with a soundproof tank or concrete building, but this requires a large installation space and increases costs.

Moreover, the gas blower 3 is equipped with a driving device.

It is the only sliding part of the transformer. There is a risk that the bearing of the sliding part may not perform its intended function due to wear or the like, causing the gas blower to stop, and there is a drawback that it is not known when this will occur.

The present invention aims to eliminate the drawbacks of the conventional gas-filled electric appliances, and provides a compact, inexpensive, low-noise gas-filled electric appliance that reduces noise emitted from gas blowers, connecting pipes, etc. It is in.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, connecting pipes with sound absorbing material are provided on the suction side and the discharge side of the gas blower, and the blower and its driving device are covered with a soundproof plate. , is characterized by reducing the noise emitted from the gas blower and its drive device, and reducing the noise emitted from the gas cooler, connecting pipe and transformer tank by propagating the gas.

(for production) A soundproof board covers the gas blower and its drive unit.

The sound generated by the pressure change caused by the blades of the blower cutting the gas reduces the noise radiated from the blower body and also reduces the noise generated from the drive device.

The connecting pipe with sound absorbing material installed on the suction side and discharge side of the blower is
The sound generated by the blower and the sound caused by the vortices of the gas flow propagate through the gas, so the sound is absorbed. This significantly reduces the noise radiated from the connecting pipes, gas cooler and converter tank.

(Example) An example of the present invention will be described below with reference to FIG. The same parts as in FIGS. 3 and 4 are designated by the same reference numerals.

A gas cooler 2 and a blower and its driving device 3 are connected to the transformer tank 1, and a connecting pipe 21 covered with a sound-absorbing material such as gas laur is connected to the suction side of the blower, and a sound-absorbing material is also attached to the discharge side of the blower. Connect the connecting pipe 22 to which is pasted. Connecting pipe 22
is fixed to the tank 1 by bolting or welding.

The surroundings of the gas blower and the drive device 3 are covered with soundproof plates 23a and 23b to which a sound absorbing material is attached. The soundproof plate 23b is provided with a door (not shown) for maintenance and inspection of the blower and drive device 3, and has a removable mounting structure, for example, a bolt tightening structure.

The gas coming out from the top of the transformer tank 1 is, as in the past,
Upper connecting pipe 4, gas cooler 2. It passes through the connecting pipe 21°, the gas blower 3, the lower connecting pipe 22 in this order, and then takes a route back to the transformer tank 1 for circulation.

In the transformer configured as above, the sound emitted from the gas blower and the drive bag W3 is absorbed by the soundproof plates 23a and 2.
3b provides sound insulation and significantly reduces noise. Further, the sound generated by the gas blower 3 and the sound generated by the vortex of the gas flow are absorbed by the sound-absorbing connecting pipes 21 and 22 provided on the suction side and the discharge side of the blower 3.

Therefore, the sound transmitted through the gas to the tank 1, the gas cooler 2, etc. is significantly reduced, and the noise radiated from the tank 1, the gas cooler 2, and the upper connecting pipe 4 is also significantly reduced.

Another embodiment of the present invention will be described with reference to FIG. 2, in which a lower connecting pipe with a sound absorbing material is disposed inside the transformer tank 1, and the other configuration is the same as that in FIG. 1. be. According to this configuration, it is also more compact. According to this configuration, an even more compact low-noise gas-filled electric appliance can be provided.

Further, if the upper connecting pipe is made of a connecting pipe with a sound absorbing material like the lower part, the noise reduction effect will be further enhanced.

Further, by providing suction/exhaust ports (not shown) in the soundproof plate surrounding the blower and the drive device, it is possible to prevent the temperature around the blower and the drive device from rising.

We can provide highly reliable, low-noise gas-filled electrical appliances.

Furthermore, other embodiments of the present invention are shown in FIGS. 5 and 6.

In FIG. 5, the transformer tank 1 includes a gas cooler 2, a gas blower, and its driving device i! 3. Connecting pipes 4.6 are connected in sequence. The gas blower and drive device 3 are covered with soundproof plates 31a and 31b to which sound absorbing material is attached.

Although not shown, the soundproof plate 31a has a door and a removable mounting structure, for example, a bolt tightening structure. A noise measuring device 32 is installed in a room surrounded by the soundproof boards 31a and 31b. This noise measuring device 32 has a sequence shown in FIG. 6, and is configured so that the remote value monitoring room 34 can monitor the noise level at any time, and the sound pressure level of each frequency band can be determined using frequency-analyzed data. has been done. Therefore, for example, if an abnormality occurs in the bearing of the gas blower drive device, the sound pressure level in the room changes, so that the abnormality can be detected immediately.

Furthermore, second soundproof plates 33a and 33b having sound absorbing material pasted thereon are disposed on the first soundproof plate.

Gas discharged from the upper part of the transformer tank 1 passes through the upper connecting pipe 4, the gas cooler 2, the gas blower 3, and the lower connecting pipe 6 in this order, and returns to the transformer tank 1, as in the conventional case, and circulates. .

In the transformer configured as described above, changes in the noise level can be monitored at any time in the remote monitoring room 34 using the noise measuring device 32 installed in a room surrounded by soundproof boards, and abnormalities in the gas blower and drive device can be detected. Detected. The first soundproof plate 31a has a door and is detachably mounted, so that maintenance and inspection such as replacing bearings for supplying oil to the sliding parts of the drive device 3 is easy. .

Further, the sound generated by the gas blower and the drive device 3 and the sound generated by the vortex of the gas flow propagate through the gas, and the noise radiated from the gas cooler 2 is reduced by The noise is significantly reduced by the second soundproof plates 33a and 33b.

〔Effect of the invention〕

As explained above, according to the present invention, connecting pipes with sound-absorbing materials are provided on the suction side and discharge side of the gas blower, and a soundproof plate is provided to cover the gas blower, thereby achieving a compact and inexpensive low-noise gas enclosure. Electrical appliances can be provided.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of a main part of a low-noise gas-filled electric appliance of the present invention, FIG. 2 is a cross-sectional side view of a main part showing another embodiment of the present invention, and FIGS. 3 and 4 are respectively FIG. 5 is a plan view and front view showing the configuration of a conventional gas-filled transformer, FIG. 5 is a sectional view showing another embodiment of the present invention, and FIG. 6 is an explanatory diagram of an abnormality monitoring sequence thereof. 1...Transformer tank 2...Gas cooler 3
... Gas blower and drive device 4.5.6 ... Connection pipe 7 ... Gate valve 8 ... High pressure bushing 9 ... Low pressure bushing lO ... Pocket for high pressure bushing 11 ... Low pressure bushing pockets 21.22...connecting pipes with adsorbent 23a, 23
b...Soundproof board agent Patent attorney Nori Chika Ken Yudo Daishimaru Ken Diagram Diagram Diagram Diagram Diagram

Claims (1)

[Claims] A gas-filled electrical appliance comprising a gas blower, a gas cooler, and a connecting pipe that connects these, characterized in that a sound absorbing material is attached to the connecting pipe and the gas blower is covered with a soundproof plate.