JPH0688109U - Switch pressure release device - Google Patents

Abstract

(57) [Summary] [Purpose] Prevents airtight leaks and facilitates manufacturing and handling.
Make the structure simple. [Structure] A pressure release port 2 formed in a switch case 1,
The pressure release plate 16 in which the peripheral edge portion 17 contacts the case 1 and covers the pressure release port 2 via the O-ring 22, and a part 20 of the peripheral edge portion 17
And a peripheral edge portion 17 other than the part 20.
A plurality of notches 21 formed on the edge and opened at the end edge, and inserted into the stop holes 19 and the notches 21 to attach the pressure release plate 16 to the case 1.
And a fixture attached to the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a switch pressure release device which releases pressure to the outside of a case to prevent damage to the case when the pressure inside the case of a closed switch such as a pole switch rises due to an accident.

[0002]

[Prior art]

 A conventional pressure releasing device of this type has a configuration shown in FIGS. In these figures, 1 is a main body case such as a flange of a pole switch, 2 is a pressure release port formed in the case 1, 3 is an annular recess formed in the case 1 at the periphery of the pressure release port 4, Is an O-ring placed in the recess 3.

Reference numeral 5 denotes a thin pressure release plate whose peripheral edge is in contact with the case 1 via an O-ring 4 and covers the pressure release port 2. Reference numeral 6 is formed in the center of the pressure release plate 5 and is located in the case 1. The spherical surface portion 7 is a cross-shaped cut groove formed in the spherical surface portion 6, and the cut pressure is set by the cut groove 7. Reference numeral 8 denotes a plurality of through holes provided in the peripheral portion of the pressure release plate 5.

Reference numeral 9 denotes a brim-shaped pressing plate that is in contact with the peripheral edge portion of the pressure-release plate 5, and 10 is a plurality of studs that are planted in the case 1. It is inserted through the through hole 8 and the through hole of the holding plate 10. Reference numeral 11 denotes a collar which is inserted through the stud 10, 12 is a cover which is inserted through each stud 10 and is located outside the pressure release plate 5, and 13 is a nut which is screwed into the stud 10. The cover 12, the collar 10 and the presser foot are provided. The pressure-release plate 5 is pressed via the plate 9 to maintain the airtightness inside the case 1.

Then, when the pressure in the case 1 rises, the spherical surface portion 6 of the pressure relief plate 5 is inverted, the cut groove 7 is broken as shown in FIG. 4C, and the pressure relief plate 5 opens to open the case 1 interior. Pressure is released.

[0006]

[Problems to be solved by the device]

 In the case of the conventional pressure relief device, since the spherical portion 6 of the pressure relief plate 5 is inverted and the kerf 7 is broken, the thickness of the pressure relief plate 5 is extremely thin, and airtight leakage occurs due to corrosion. There is a fear.

Further, since the pressure release pressure is set according to the plate thickness of the pressure release plate 5 and the depth of the kerf 7, the pressure release pressure varies due to a minute change, making it difficult to manufacture the pressure release plate 5, and a little. Since it is deformed by the external force of, the product must be carefully handled and the structure is complicated. The present invention has been made in view of the above points, and an object of the present invention is to provide a switch pressure release device which prevents airtight leakage, is easy to manufacture, handle, and sets the release pressure and has a simple structure.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, a switch pressure release device of the present invention comprises a pressure release port formed in a case of a switch and a pressure release port through a O-ring with its peripheral edge abutting the case. A pressure release plate covering the outer peripheral surface, a stop hole formed in a part of the peripheral edge portion, a plurality of notches formed in the peripheral edge portion other than the partial part and opening at the edge, the stop hole, and The pressure-relief plate is inserted into each of the notches and the fixture is attached to the case.

[0009]

[Action]

 In the switch pressure release device of the present invention configured as described above, a stop hole and a plurality of cutouts opening at the end edges are formed in the peripheral portion of the pressure release plate, and a fixing tool is provided in the stop hole and the cutout. Since the pressure relief plate is inserted through and attached to the case, when the pressure inside the case rises, the peripheral edge of the retaining hole of the pressure relief plate remains fixed, and the peripheral edge other than the retaining hole is center side. Sliding, the peripheral edge of the glove disengages from the fixture, the pressure relief plate bends, the pressure relief port opens, and the pressure inside the case is released.

Therefore, since the pressure relief plate does not break like the conventional one, it is possible to increase the thickness of the pressure relief plate, there is no fear of airtight leakage due to corrosion, it is easy to manufacture, and the variation of the relief pressure is extremely large. Even if the deformation is caused by an external force, there is little change in the pressure release pressure and it is easy to handle.

Furthermore, it is easy to set the pressure-releasing pressure by the size of the peripheral edge of the pressure-releasing plate, the length of the notch, the fixing position by the fixture, and the like. In addition, the stop hole prevents the pressure relief plate from scattering, so the structure is extremely simple.

[0012]

【Example】

 One embodiment will be described with reference to FIGS. 1 to 4. In these drawings, the same reference numerals as those in FIG. 5 denote the same or corresponding ones. Reference numeral 14 denotes an outer peripheral wall integrally formed inside the case 1 around the pressure release port 2 and is substantially perpendicular to the surface of the case 1. Reference numeral 15 is a bent portion formed from the tip of the outer peripheral wall 14 toward the center side, 16 is a pressure-release plate that covers the pressure-release port 2 and a peripheral edge portion 17 is in contact with the case 1, and 18 is an inner side of the peripheral edge portion 17 of the pressure-release plate 16. The inner peripheral wall is formed by being bent from, and is located substantially parallel to the outer peripheral wall 14. Reference numeral 19 denotes a stop hole that is transparently provided in a part 20 of the peripheral edge portion 17 of the pressure release plate 16, and 21 is a plurality of notches formed in the peripheral edge portion 17 of the pressure release plate 16 other than the part 20. An opening is formed at the edge of the portion 17.

Reference numeral 22 is an O-ring interposed between the outer peripheral wall 14 and the inner peripheral wall 18, 23 is a fixing screw, which is inserted into the stop hole 19 and the notch 21 via the spring washer 24 and screwed into the case 1. Then, the pressure release plate 16 is fixed to the case 1 to form a fixture.

When the pressure inside the case 1 rises, the peripheral edge portion 17 of the pressure release plate 16 is fixed by the stopper hole 19, so that the peripheral edge portion 17 other than the part 20 is fixed as shown by the broken line in FIG. Slides out and floats up, each notch 21 comes out of the fixing screw 23, the pressure relief plate 16 is bent at the portion shown by the chain line in FIG. 2A, and the pressure relief port 2 is opened as shown in FIG. The pressure in space 1 is released. At this time, the pressure release plate 16 is only deformed, and is not scattered or dropped.

[0015]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. In the switch pressure release device of the present invention, a stop hole 19 is formed in a part 20 of the peripheral edge portion 17 of the pressure release plate 16, and a notch 21 having an opening at the edge is formed in the peripheral edge part 17 other than the part 20. 19. Since the fixing tool is inserted into the notch 21 and the pressure relief plate 16 is attached to the case 1, when the pressure in the case 1 rises, a part 20 of the peripheral edge portion 17 of the pressure relief plate 16 stops. The fixed state is maintained by the hole 19 and the fixing tool, the peripheral edge portion 17 other than the part 20 slides toward the center, the peripheral edge portion 17 is disengaged from the fixing tool, and the pressure relief plate 16 is bent to open the pressure relief port 2. However, since the pressure inside the case 1 can be released and the pressure relief plate 16 is not broken as in the conventional case, the plate thickness can be increased and the risk of airtight leakage due to corrosion can be eliminated. It is easy to manufacture, has little variation in pressure relief, and has no external force. Even more deformation occurs, much variation in the discharge pressure pressure is easy to handle.

Further, it is easy to arbitrarily set the pressure-releasing pressure depending on the size of the peripheral edge portion 17 of the pressure-releasing plate 16, the length of the notch 19, the fixing position of the fixing tool, and the like. In addition, the stop holes 19 can prevent the pressure-release plate 16 from scattering, and the structure is simple.

[Brief description of drawings]

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

2A and 2B are a plan view and a cut side view of the pressure relief plate of FIG.

FIG. 3 is an operation explanatory diagram of FIG. 1.

FIG. 4 is a cut front view of another state of FIG.

FIG. 5 is a cut front view of a conventional example.

6A, 6B and 6C are a cutaway front view, a plan view and a plan view of another state of the pressure release plate of FIG.

[Explanation of symbols]

 1 Case 2 Pressure Release Port 16 Pressure Release Plate 17 Peripheral Edge 19 Stop Hole 20 Part 21 Notch 22 O-ring

Claims (1)

[Scope of utility model registration request] 1. A pressure release port formed in a case of a switch,
A pressure-releasing plate whose peripheral portion is in contact with the case and covers the pressure-releasing port via an O-ring, a stop hole formed in a part of the peripheral portion, and formed in the peripheral portion other than the partial portion. A switch pressure release device, comprising: a plurality of notches opened at the end edge thereof;