JPS61183885A - Sealed type electric appliance - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a sealed electrical device, and more particularly, to a sealed electrical device that uses a synthetic rubber gasket in a sealing portion and houses a moisture adsorption means inside. It is related to.

[Conventional technology]

Conventionally, in sealed electrical equipment with a small gas space, such as lightning arresters for power distribution, it is difficult to increase the storage space for desiccant (adsorbent). That is, silica gel or synthetic zeolite is usually used as a desiccant, but the amount thereof is limited because of the limited gas space. Furthermore, since the water retention capacity of silica gel or synthetic zeolite changes depending on the temperature, if the adsorption capacity approaches the amount of invading water, there is a risk that it will become a source of water release.

SF, gas equipment, for example 77'! For the SF4 gas insulated substation installed in the above substations, in order to adsorb and remove impurities such as SF, water present in gas, SF and cracked gas, an adsorbent layer made of synthetic zeolite is installed inside the SF4 gas insulated substation. An adsorption device is known in which the water once adsorbed on the adsorbent reacts and is converted into a stable compound.An adsorption device is known in which water is used together with an adsorbent regenerating substance such as elementary calcium (Special Publication No. 56-Hiro 2-71). Public bulletin)
.

In the case of sealed electrical equipment equipped with such adsorption means, 8F,
Due to the size of the gas-filled space, there is no possibility of moisture permeation.
A ring is used as a gas seal, but since the length of the O-ring is relatively small, the hydrogen generated by calcium hydride (CaH) is SF! The concentration of 5lrj in the gas space did not become high, and the rate at which it escaped into the atmosphere through the O-ring of the seal was so slow that it was almost as if it did not escape.

[Problem that the invention seeks to solve]

- Conventional sealed electrical equipment as described above had the problem that the hydrogen concentration in the gas space did not increase, so there was very little hydrogen escaping through the O-ring, making it impossible to maintain a dry state for a long period of time. .

This invention attempts to solve such problems,
The object of the present invention is to obtain a sealed electrical device that can maintain a dry state for a long period of time by increasing the escape of hydrogen through an O-ring.

[Means for solving problems]

In the sealed electrical equipment according to the present invention, an adsorption means made of a moisture adsorbent and calcium hydride is housed in the gas space, a synthetic rubber gasket is inserted in the gas seal part, and the volume occupied by the internal components is reduced. Volume of gas space excluded (ml
/) and the Director General of Synthetic Rubber Patsukin (art).
It is 10R1/an or less.

[Effect]

In this invention, calcium hydride converts moisture adsorbed on the adsorbent into stable hydrogen gas, and this hydrogen gas is permeated to actively escape from the thin synthetic rubber packing.

〔Example〕

The inventors found that when the length of the synthetic rubber packing is relatively thick with respect to the gas space, the hydrogen concentration inside increases significantly, and therefore the escape of hydrogen gas through the synthetic rubber packing is promoted. The present invention has been developed based on the discovery that the present invention can be carried out, and the present invention will be described below with reference to an embodiment shown in the drawings.

Figure 1 shows a lightning arrester for power distribution, and shows a sealed container made of insulator (1
) A lightning arrester element (2) such as a SiC element is housed in the circle,
A suction means (3) is housed in the upper part of the internal space.

(R is a series gap, (j/) (side) (33) is a synthetic rubber gasket made of a material such as neoprene rubber that has good hydrogen gas permeability and is inserted into the seal part, (A/) is a ground terminal. , (6) is a metal map, and (ri) is a coil spring.

The volume of the internal gas space (ml7) excluding the volume occupied by internal components such as the lightning arrester (2) and the synthetic rubber gasket (j/
)(j)(SJ) The relationship with the total circumferential length (cm) is 101'lj/cm or less.

As shown in Fig. 1, the adsorption means (3) contains moisture adsorbents (3 pieces) made of silica gel and calcium hydride (J
, 7), a cloth bag containing calcium hydride (33) (
3μ) etc. (3) is a plate with ventilation holes or an air permeable member made of synthetic resin film.

In addition, since the internal gas space of the power distribution lightning arrester is small, moisture tends to condense inside, so it is necessary to have sufficient margin for the use of seals and desiccant (adsorbent).

With the above configuration, moisture that has entered the device through the seal is adsorbed by the silica gel (3), and then the moisture that is gradually extracted from the silica gel (32) is absorbed by calcium hydride (? , ? ) and turn into hydrogen gas, which moves into the gas space via a path opposite to the direction of water movement. This hydrogen gas is a synthetic rubber gasket Crt)C
10)<53) to the outside world where the hydrogen concentration is equal to zero. During this time, silica gel (3) adsorbs water, and calcium hydride (JJ) absorbs silica gel (,7,
2) Continue to generate hydrogen by removing the water. In this way, the moisture that has entered through the synthetic rubber gasket becomes hydrogen gas and is discharged to the outside, so that the interior remains dry for a long period of time.

In the above embodiments, the case where the lightning arrester (2) is a SiC element has been described, but zinc oxide elements, which have come into use in recent years, can also be used to prevent dew condensation and thereby maintain stable characteristics. Furthermore, other sealed electric devices may be used, and similar effects can be achieved.

Further, although an example has been described in which neoprene rubber is used as the synthetic rubber packing, similar results can be obtained by using silicone rubber. In addition, in the case of silicone rubber, the water permeation rate is extremely high, and the hydrogen permeation rate is also high.

〔Effect of the invention〕

In this invention, as is clear from the above explanation, the hydrogen gas generated in response to the amount of water removed escapes to the atmosphere through the synthetic rubber packing used in the sealing part, so the interior is kept in a dry state. It can be kept stable for a long period of time, and no problems occur due to hydrogen production.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIG. 1 is a partially enlarged sectional view thereof. (1)...Sealed container, (3)...Moisture adsorption means, (Sυ
(rx) (h3)...Synthetic rubber gasket. In each figure, the same reference numerals indicate the same or corresponding parts. Horse 1 diagram procedural amendment (voluntary) Showa. Hmm, gate. Day

Claims (1)

[Claims] an adsorption means disposed in a gas space in a sealed container and made of a moisture adsorbent and calcium hydride; and a synthetic rubber packing attached to a sealing part of the sealed container, and excluding the volume occupied by internal components. Volume of gas space (ml)
The relationship between and the circumferential length (cm) of the synthetic rubber packing is 10
Sealed electrical equipment with ml/cm or less.