JP2555755Y2 - Pole switch discharge device - Google Patents

Description

[Detailed description of the invention]

[0001]

In the present invention, when the pressure inside the case of a sealed pole switch increases due to an accident, the pressure is released outside the case at a predetermined pressure to prevent damage to the case. The present invention relates to a pole switch pressure relief device.

[0002]

2. Description of the Related Art A conventional pressure relief device of this type has the structure shown in FIG. In the figure, 1 is a main body case of a pole switch, 2 is an opening formed in the case 1, 3 is an annular recess formed in the case 1 around the opening 2, and 4 is placed in the recess 3. An O-ring 5 is a thin pressure-release plate that covers the opening 2 and is placed on the O-ring 4, 6 is a spherical portion formed in the center of the pressure-release plate 5 and located in the case 1, and 7 is a flange-shaped mounting plate. , Abuts against the peripheral edge of the pressure release plate 5 and uniformly presses the entire circumference of the O-ring 4.

[0003] Reference numeral 8 denotes a plurality of studs planted on the outer surface of the case 1, through which the pressure release plate 5 and the mounting plate 7 are inserted. Reference numeral 9 denotes a washer inserted through the stud 8, and reference numeral 10 denotes a nut screwed to the stud 8, which presses the mounting plate 7 via the washer 9 to maintain the airtightness in the case 1. When the pressure in the case 1 rises, the spherical portion 6 of the pressure release plate 5 reverses and breaks, and the pressure in the case 1 is released.

[0004]

In the case of the conventional pressure-releasing device, the pressure-releasing plate 5 must have a constant thickness and a uniform material in order to make the pressure-releasing pressure constant. If the surface of the pressure release plate is damaged, the pressure exerted on the pressure release plate is affected, so that care must be taken during transportation and assembly, and it is difficult to set the pressure release pressure. Further, when the pressure for the pressure release must be set low, the thickness of the pressure release plate 5 must be particularly thin, and there is a problem that holes are formed due to corrosion or the like.

An object of the present invention is to provide a pressure release device for a pole switch which is easy to manufacture, handle and set the pressure for release, keeping the above points in mind.

[0006]

In order to solve the above-mentioned problem, a pole switch pressure relief device according to the present invention is provided with an opening formed in a case of a pole switch and integrally formed inside a periphery of the opening. An outer peripheral wall formed substantially perpendicular to the surface of the case, a pressure receiving plate covering the opening and having a peripheral edge in contact with the case, an inner peripheral wall substantially parallel to the outer peripheral wall formed on the pressure receiving plate, an outer peripheral wall and an inner peripheral wall And an attachment plate which is mounted on the inner surface of the pressure receiving plate and whose end abuts on the end of the outer peripheral wall.

[0007]

In the pole switch pressure relief device of the present invention configured as described above, the mounting plate mounted on the inner surface of the pressure receiving plate is in contact with the end of the outer peripheral wall of the case opening. When the internal pressure rises, the mounting plate is deformed as the pressure receiving plate comes off from the case, the pressure receiving plate comes off from the case, and the pressure inside the case is released outside the case. Since the mounting plate is deformed, the discharge pressure can be easily set according to the strength of the deformation of the mounting plate, that is, the number, thickness, shape, etc. of the mounting plate, and the manufacture and handling are easy. Further, since the O-ring for maintaining airtightness is interposed between the outer peripheral wall of the case and the inner peripheral wall of the pressure receiving plate, the reaction force of the O-ring does not directly act on the mounting plate, and the pressure receiving plate slightly rises. Even if the sealing force does not decrease.

[0008]

An embodiment will be described with reference to FIG.
In the figure, reference numeral 11 denotes an opening for degassing formed in the case 1, and reference numeral 12 denotes an outer peripheral wall integrally formed inside the case 1 around the opening 11, which is substantially perpendicular to the surface of the case 1. I have. 13 is a bent portion formed inward from an end portion 14 of the outer peripheral wall 12, 15 is a pressure receiving plate that covers the opening 11 and a peripheral edge portion 16 abuts on the case 1, and 17 is a peripheral portion 1 of the pressure receiving plate 15.
6 is an inner peripheral wall formed by being bent from the inside, and is positioned substantially parallel to the outer peripheral wall 12.

Reference numeral 18 denotes an O-ring interposed between the outer peripheral wall 12 and the inner peripheral wall 17, reference numeral 19 denotes a stud planted on the inner surface of the pressure receiving plate 15, and reference numeral 20 denotes a belt-like mounting plate, as shown in FIG. Thus, the through hole at the center is inserted through the stud 19. Reference numeral 21 denotes a locking portion formed by bending both end portions of the mounting plate 20, and is located outside the end portion 14 of the outer peripheral wall 12. Reference numeral 22 denotes a washer inserted through the stud 19, and reference numeral 23 denotes a nut screwed into the stud 19. The mounting plate 20 is fixed to the pressure receiving plate 20 via the washer 22, and an end of the mounting plate 20 is an end of the outer peripheral wall 12. The peripheral portion 16 of the pressure receiving plate 15 contacts the case 1 while being in contact with the portion 14, and the O-ring 18 maintains airtightness.

When the pressure in the case 1 rises abnormally at the time of an accident, the pressure receiving plate 15 tries to come off from the opening 11 of the case 1 without being deformed, and when a predetermined pressure is reached, the pressure receiving plate 15 shown in FIG.
As shown in (2), the mounting plate 20 is deformed, the pressure receiving plate 15 is detached from the case 1, and the pressure in the case 1 is released to the outside of the case 1. At this time, the locking portions 21 at both ends of the mounting plate 20 are locked to the bent portions 13 of the case 1 and the scattering of the pressure receiving plate 15 is prevented.

Therefore, the pressure receiving plate 15 is not broken like the conventional pressure releasing plate, and the mounting plate 20 is deformed.
It is not necessary to adjust the thickness and material strength of the
A value of 0 can correspond to the pressure to be released, and its adjustment is easy.

Next, FIG. 3B shows the mounting plate 2 of FIG.
0 is fixed by two studs 19, the discharge pressure is larger than A in FIG. 3, and C in FIG. 3 uses four mounting plates 20, and FIG. The discharge pressure is higher than B, and the discharge pressure can be easily set by changing the strength and combination of the mounting plate 20 without changing the pressure receiving plate 15. If a spring material is used for the mounting plate 20,
After the pressure release, the opening 11 can be closed immediately.

[0013]

[Effects of the Invention] Since the present invention is configured as described above, the following effects can be obtained. The mounting device 20 mounted on the inner surface of the pressure receiving plate 15 has the end portion 14 of the outer peripheral wall 12 of the opening 11 of the case 1.
When the pressure in the case 1 rises, the pressure receiving plate 15 tries to come off the case 1 so that the mounting plate 2
0 is deformed, and the pressure receiving plate 15
The internal pressure is released to the outside of the case 1, and the released pressure is not due to the destruction of the pressure receiving plate 15 but to the deformation of the mounting plate 20.
The release pressure can be easily set according to the strength of the deformation of 0, that is, the number, thickness, shape, etc. of the mounting plates 20, and the production and handling are easy. Further, an O-ring 18 for maintaining airtightness is provided between the outer peripheral wall 12 of the case 1 and the inner peripheral wall 1 of the pressure receiving plate 15.
7, the reaction force of the O-ring 18 does not directly act on the mounting plate 20, and it is possible to prevent a decrease in sealing force due to the lifting of the pressure receiving plate 15.

[Brief description of the drawings]

FIG. 1 is a cutaway front view of one embodiment of the present invention.

FIG. 2 is a modified view of FIG.

FIGS. 3A, 3B, and 3C are left side views of a part of FIG. 1 and two other examples.

FIG. 4 is a cutaway front view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 11 Opening 12 Outer peripheral wall 14 End part 15 Pressure receiving plate 16 Peripheral part 17 Inner peripheral wall 18 O-ring 20 Mounting plate

Claims (1)

(57) [Scope of request for utility model registration] 1. An opening formed in a case of a pole-mounted switch, an outer peripheral wall integrally formed inside the periphery of the opening and substantially perpendicular to a surface of the case, and a peripheral edge covering the opening and having a peripheral edge portion, A pressure-receiving plate in contact with the case, an inner peripheral wall formed on the pressure-receiving plate and substantially parallel to the outer peripheral wall, an O-ring interposed between the outer peripheral wall and the inner peripheral wall, and an inner surface of the pressure-receiving plate. A pole switch pressure relief device comprising: a mounting plate that is mounted and has an end abutting on an end of the outer peripheral wall.