JPH082964Y2 - Electric device pressure release device - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application This invention relates to a gas pressure release device for boosting the internal gas pressure of a sealed electric device.

B. Outline of the Invention The present invention is a device for releasing pressure to protect a container when the internal pressure of an electric device exceeds a certain set value, and the pressure releasing device main body is formed by integrally molding a conductor member as an insert. The result is a simplified structure, improved performance, and improved quality.

C. Conventional technology Generally, in an enclosed electric device, when an excessive accident current that cannot be processed by itself flows, a short circuit occurs inside the electric device and the gas pressure inside the electric device may rapidly increase. In such a case, a device provided with a pressure release device is widely used to prevent the container of the electric device from being damaged.

Conventionally, in an electric device equipped with such a pressure release device,
There is an external flash arrester as illustrated in FIG. this is,
A cylindrical element inner body 2 of the porcelain insulator 1 is provided with an element column body 3 formed by stacking a large number of zinc oxide elements, and the upper and lower ends of the porcelain insulator 1 are closed by caps 4 and 5, respectively. It is a thing.

In addition, the element columnar body 3 configured as described above is provided with the cap 4,
It is supported by the distance 6 which is the support stand installed in 5,
In addition, the ends of the caps should be in close contact with the caps 4 and 5 so that they can be electrically connected securely.

A pressure relief device is installed on each of the upper and lower caps 4 and 5.

As shown in the enlarged vertical cross-sectional view of FIG. 4, this pressure release device has a holding plate member 7 fixed to the end portion of the porcelain bushing 1 on which the lower cap 5 is placed.

The pressing plate member 7 is an annular portion that abuts on the bottom of the porcelain bushing 1.
7a, a pedestal portion 7b that receives the distance 6, and a plurality of rim-shaped aggregate portions 7c that connect the annular portion 7a and the pedestal portion 7b to each other. The annular portion 7a, the pedestal portion 7b, and the bone A plurality of openings surrounded by the material portion 7c are configured as gas discharge ports.

The holding plate member 7 configured as described above is installed by fixing the annular portion 7a of the fixing metal member 8 fixed to the outer circumference of the end portion of the porcelain tube 1 with the bolt 9.

Further, a gasket 10 is arranged between the end face of the porcelain insulator 1 and the position corresponding to the annular portion 7a to form an airtight structure.

Further, a thin flat pressure release plate 11 is arranged on the outer side surface of the holding plate member 7, a ring-shaped pressure release plate holding plate 12 is arranged from above, and the pressure release plate holding plate 12 is bolted to the annular portion 7a. Then, the pressure release plate 11 is fixed. Along with this, the annular portion 7a,
A gasket (14) is interposed between the pressure releasing plate (11) and the outer peripheral portion of the pressure releasing plate (11) to form an airtight structure in this portion.

In addition, the same structure as the pressure release device of the lower cap 5 described above is also installed in the upper cap 4.

Further, an arc horn portion 15 which also serves as a gas ejection port is laterally provided on each of the caps 4 and 5.

Further, as shown in FIG. 4, the lower cap 5 is fixedly supported by the fixing fitting 8, and the ground terminal 16 is pulled out from the lower cap 5. Along with this, the installation base
The lower cap 5 is fixed to 17 via an insulating seat 18 to insulate the both.

When a large current flows due to a lightning strike, the element column 3 is short-circuited and the gas pressure inside the porcelain bushing 1 rises. At this time, before the accident such as explosion and scattering of the porcelain insulator 1, the pressure relief plate 11 is destroyed by the high pressure gas,
From the arc horn parts 15 and 15 in the upper and lower caps 4 and 5,
The gas is released in the opposite direction.

Then, at the time point when the gases emitted facing each other face each other in this way, an arc voltage of a certain value or more acts and an external flash occurs. Thus, the pressure relief device prevents damage to the arrester.

Further, in order to detect the deterioration of the lightning arrester, the current flowing through the zinc oxide element pillar 3 of the lightning arrester is applied to the ground terminal 16 of the lower cap 5.
The state of deterioration is detected by extracting the current value from the device and checking the current value.

D. Problems to be Solved by the Invention In the conventional pressure relief device for electric equipment as described above, the pressure relief plate member, the pressure relief plate, and the pressure relief plate are constituted by a large number of parts, and the number of assembling steps is also large. Therefore, there was a problem that the product price increased.

In addition, the components of the pressure release device require costly plating for the pressure plate member, the pressure release plate, and the pressure release plate retainer plate, etc. to prevent corrosion, resulting in increased costs and man-hours for quality maintenance. , In particular, the pressure relief plate is a thin flat plate of about 0.15 to 1 mm, and since it constitutes an airtight surface, it is easily scratched during nickel plating, transportation, storage, etc.
There was a problem of poor yield.

Furthermore, since the airtight parts by gaskets must be provided on the upper and lower parts of the annular part of the holding plate member respectively, the upper and lower caps have four airtight parts, which makes it difficult to maintain reliability of airtightness. It was

In addition, this pressure relief device is configured only for the purpose of pressure relief, and separately has a terminal portion for taking out a current (several μA to several hundred mA) flowing inside the element for detecting the deterioration of the arrester. Since it has to be installed, and for this reason, the cap of the lightning arrestor and the installation base must be insulated by an insulating seat, the structure becomes complicated, the number of assembly steps increases, and the product price rises. .

The present invention has been made in view of the above points, and an object thereof is to provide a low-priced product having a simple structure, high airtight reliability, and a terminal for taking out a battery inside an airtight container.

E. Means for Solving the Problems The pressure relief device for an electric device of the present invention is an outer frame part, a pedestal part, and an aggregate part that supports them so as to bridge them, and a thin plate that closes the gap opening between them. The pressure-releasing plate portion is shaped into a single body by inserting a conductor member into the pedestal portion.

F. Action With the above-described configuration, when the internal pressure of the electric device equipped with the pressure relief device increases, the pressure relief plate portion of the pressure relief device main body breaks and opens, and escapes gas to the outside, It has the effect of releasing pressure.

Further, it has an effect of allowing the detection current of the electric device in the closed container to be taken out through the inserted conductor member.

G. Embodiment Hereinafter, an embodiment of the pressure relief device for electric equipment of the present invention will be described with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, parts corresponding to those in FIGS. 3 and 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is an enlarged vertical cross-sectional view of a main part of a lower portion of a lightning arrester in which a pressure relief device of this example is installed. is there.

 The pressure release device of this example is installed at the lower end of the porcelain bushing 1.

This pressure release device has an integral structure of the main body. That is, an annular outer frame portion 20a that should correspond to the peripheral surface of the bottom of the porcelain bushing 1, a pedestal portion 20b for supporting the element columnar body 3 located at the center thereof, and an outer frame portion 20a centered on this pedestal portion 20b. Rib-shaped aggregates arranged in a radial pattern toward
0c, and further these outer frame portion 20a, pedestal portion 20b, aggregate portion 20c
A plurality of gas discharge ports surrounded by
The pressure relief device main body 20 is integrally configured so as to be closed at d.

Further, the pedestal portion 20b is formed in a cylindrical shape in order to support the element columnar body 3, and an electrode 21 is arranged on an end face on which the element columnar body 3 is mounted. The electrode 21 is a conductor penetrating the pedestal portion 20b. It is configured by being connected to one end of the member 22.

Further, the pressure-release device main body 20 configured as above is configured by integrally molding the conductor member 22 as an insert using an insulating material (for example, epoxy) having excellent weather resistance, electrical characteristics, mechanical characteristics, and thermal characteristics. . A reinforcing material such as a disk may be inserted inside the mold.

The pressure relief device main body 20 configured in this manner has an outer frame portion 20.
The portion a is fixed to the fixing metal fitting 8 installed at the end of the porcelain tube 1 with the bolt 9 for installation. At this time, the gasket 10 is arranged between the bottom surface of the porcelain bushing 1 and the outer frame portion 20a to protect the airtightness.

Further, the lower cap 5 is fixedly installed on the fixture 8, and the bolts 23 of the installation base 17 are fitted to install the entire arrester.

At this time, the free end portion of the pedestal portion 20b is extended from the through hole of the lower cap 5, the free end portion of the conductor member 22 protruding from this is threaded, and this screw portion is insulated via the insulating member 24. The ground terminal 25 is arranged in this state, and the nut 26 is fitted and fixed to this screw portion.

Further, the ground terminal 25 connected to the conductor member 22 is fixed to and supported by the lower cap 5 via the insulator 27.

The ground terminal 25 is connected to a lightning arrester subordination detection unit (not shown).

Next, the pressure relief device main body 20 on the upper cap 4 side of the lightning arrester will be described.

This pressure release device main body 20 is also configured and installed in the same manner as that on the side of the lower cap 5.

However, the free end of the pedestal portion 20b is projected from the through hole of the upper cap 4 and the line terminal 28 is connected to the conductor member 22 thereof.

The line terminal 28 is directly fixed to the upper cap 4 without an insulating member.

The configuration other than that described above is the same as that on the side of the lower cap 5 shown in FIG. 1 described above, and a description thereof will be omitted.

In the arrester including the pressure relief device configured as described above, when an accident current such as a lightning strike flows through the arrester, the insulator 1
An internal flash occurs and the gas pressure in the inner space 2 rises. Then, the pressure of this gas causes the pressure-release plate portion 20d, which is a weak point in the structure of the pressure-release device main body 20, to drop out and open, and a gas of higher pressure is blown out from this.

In this way, the gas blown from the cylindrical inner space 2 to the upper and lower caps 4 and 5 is jetted from the arc horns 15 and 15 so as to face each other and contact each other, and the arc voltage is generated here. It causes external flashover.

Next, when detecting the inferior state of the lightning arrester, a current enters from the line terminal 28 and the conductor member 22 of one of the pressure release device main bodies 20.
And the electrode 21 through the element column of zinc oxide, the electrode 21 and the conductor member 22 of the body 20 of the other pressure release device, the current value output from the insulated ground terminal 25 is detected, and the data is managed and checked. By doing so, the deterioration of the arrester is detected.

H. Effect of the Invention As described in detail above, according to the pressure relief device for an electric device of the present invention, the pressure relief device body is integrally molded by using the conductor member as an insert, and therefore, compared with the conventional one. ,
This has the effect of reducing the number of parts and simplifying the structure. Furthermore, because it is molded, the cutting process is eliminated, and the number of parts is reduced to reduce the assembly man-hours and management man-hours, and the need for plating for corrosion protection is eliminated.
This has the effect of facilitating manufacturing and improving its quality.

Further, there is an effect that the airtight portion can be reduced and the airtightness can be improved.

Further, the inserted conductor member can take out the detected current of the electric device inside the porcelain tube which is kept airtight, and has an effect that it is possible to omit the installation of the other terminal member.

[Brief description of drawings]

1 and 2 are vertical cross-sectional views of an essential part showing an embodiment of a pressure relief device for electric equipment of the present invention, and FIG. 3 is a vertical cross-sectional view showing an example of a conventional pressure relief device for a lightning arrester. FIG. 4 is an enlarged vertical sectional view of the main part. 20 …… Pressure release device main body, 20a …… Outer frame part, 20b …… Pedestal part,
20c ... aggregate part, 20d ... pressure release plate part, 22 ... conductor member, 25
...... Grounding terminal, 28 …… Line terminal.

Claims (1)

[Scope of utility model registration request] 1. An outer frame portion and a pedestal portion into which a conductor member is inserted are combined, an aggregate portion is arranged so as to form an opening, and a thin plate-shaped pressure release plate portion is provided so as to close the opening. A pressure relief device for an electric device, characterized in that the whole structure is integrally molded so as to be provided.