JP2009245779A - Sealed type switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scatter preventing means at a sealed type switch having a case in which openings of upper and lower case bodies are provided with flexure parts and connected to each other. <P>SOLUTION: The scatter preventing means 31 is provided at the sealed type switch to which the strength of the flexure parts are set to form a clearance D between the openings of the upper and lower case bodies 11, 12 by the deformation of both flexure parts 11D, 12F. The scatter preventing means includes first and second scatter preventing members 31A, 31B having air holes 31C, and openings formed in square cylinder shape. The first and second scatter preventing members are mounted to the whole inner surface peripheries of the upper and lower case bodies respectively. The depth dimensions or mounting positions of the first and second scatter preventing members are set so that the first and second scatter preventing members abut in a suitable overlapping state or are brought close to each other to the extent of not allowing a predetermined scatter material to pass through and that the overlapping state is ensured while the first and second scatter preventing members relatively move in a vertical direction, maintaining the abutting or close state in the suitable overlapping state when bursting. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hermetic switch provided with scattering prevention means.

  In the switch shown in Patent Document 1, the opening of the case is closed with a lid, the lid is held in the case by a plurality of connecting members, and the internal structure provided with a blocking portion in the case is short-circuited inside the case. When the pressure becomes high, the lid side is deformed to form a gap between the case and the lid, and the internal pressure is released from the gap. In addition, a plurality of anti-scattering members are provided on the upper part of the inner wall surfaces before and after the case. Each anti-scattering member has a substantially “H” cross section, and each has a plurality of pressure relief holes. .

  Now, when an explosion occurs in the case due to an accident such as an internal short circuit, the inside of the case becomes high pressure and the lid is deformed, and a pressure release gap is formed between the opening of the case and the lid. At the same time, the anti-scattering member is also deformed upward by the gas pressure with the bent portion as a boundary, and the gap formed between the opening and the lid is closed by the anti-scattering member. The gas in the case is released to the outside through a pressure relief hole through a gap between the opening and the lid. Moreover, the fragments of the internal structure at the time of the explosion are prevented from scattering outside the case by the scattering preventing member.

  On the other hand, the switch disclosed in Patent Document 2 is arranged inside the upper case body having an open lower end and the opening at the lower end of the upper case body, and hermetically closes the opening of the upper case body through packing. A lower case main body and an internal structure including a blocking part are housed.

At the lower edge of the upper case body and the peripheral part of the lower case body, a tongue-like upper case body side bending portion and a lower case body side bending portion are provided, respectively, and these both bending portions are overlapped by bolts and nuts. Combined to form a case. When the internal pressure of the case rises due to an accident such as an internal short circuit, both the flexible parts are plastically deformed to form a gas outflow gap between the lower case main body and the upper case main body, and the gas is released. Yes.
JP 2000-57910 A JP-A-8-31275

  In the switch of Patent Document 1, when an explosion occurs in the case due to an accident such as an internal short circuit, the inside of the case becomes high pressure and the lid is deformed, and the pressure release gap is formed between the opening of the case and the lid. Is formed. At the same time, the anti-scattering member is also deformed upward with the gas pressure as a boundary, and the gap formed between the opening and the lid is closed by the anti-scattering member. It is necessary to coordinate with the scattering prevention member. However, specifically, it is difficult to coordinate the strength of the anti-scattering member, the bending angle, the area received by the pressure relief, and the strength of the lid. In addition, if the above-mentioned cooperation is not taken, there will be a problem that scattered objects are scattered outside.

  For example, if the strength of the anti-scattering member is high or the area received by the pressure release is small, the anti-scattering member may be hardly deformed during an accident such as an internal short circuit, or even if it is deformed, it may be deformed after the scattered object is scattered There is also, I can not capture the flying object. On the contrary, when the strength of the scattering prevention member is weak or the area received by the pressure release is large, the bent portion may be damaged, and the role as a scattering prevention member may not be fulfilled. In addition, there is a problem that the cooperative relationship between the lid and the anti-scattering member becomes more complicated due to the short-circuit location and the energy of the explosion during the short-circuit.

  In the switch shown in Patent Literature 2, there is no actual example of providing the scattering prevention member in the past, and when the scattering prevention member shown in Patent Literature 1 is provided, the same problem as above can be considered.

  An object of the present invention is to provide scattering prevention means in a hermetic switch having a case in which a flexure is provided in the openings of the upper and lower case bodies and the openings are coupled to each other.

  The present invention includes a case having an upper case body having a lower end opened, a lower case body disposed inside the opening at the lower end of the upper case body and hermetically closing the opening through packing, A plurality of upper case body side flexures integrally provided at the lower end of the upper case body, and the lower case body includes a plurality of upper case body side flexures respectively corresponding to the plurality of upper case body side flexures. A case in which the openings of the upper case main body and the lower case main body are joined together in a state where the lower case main body side bending portions are integrally provided and the respective lower case main body side bending portions are superposed on the corresponding upper case main body side bending portions. The upper case body and the lower case body are deformed when the pressure in the case exceeds the allowable value, and the upper case body and the lower case body are bent. A hermetic switch with anti-scattering means in which the strength of each flexible part is set so as to form a gap between the openings, and fragments of the internal structure are prevented from scattering from the gap to the outside of the case when the pressure is released. It is related.

  According to a first aspect of the present invention, there is provided a first anti-scattering member and an opening in which the anti-scattering means is formed of a belt-like plate material having a large number of ventilation holes that do not allow a predetermined scattering object to pass through, and the opening is formed in a square cylindrical shape. The portion is formed of a second scattering prevention member formed in a square cylindrical shape or a cage shape, and is disposed at a position that does not interfere with the internal structure along the entire inner circumference of the case, and the upper case body and the lower portion It arrange | positions so that the connection part of the opening parts of a case main body may be covered over a perimeter, the 1st scattering prevention member is attached in the state contact | abutted to the perimeter of the inner surface of an upper case main body, and 2nd The anti-scattering member is attached in contact with or close to the entire inner surface of the lower case body, and the first anti-scattering member and the second anti-scattering member are in contact with each other in an appropriate overlapping state or predetermined scattering. Close enough not to let things go through and release The first anti-scattering member and the second anti-scattering member move in the first direction so that the overlapping state is ensured while relatively moving in the vertical direction while maintaining the contact or proximity state in an appropriate overlapping state. The depth dimension or the mounting position of the scattering prevention member and the second scattering prevention member is set.

  According to a second aspect of the present invention, the anti-scattering means is formed of a belt-like plate material having a large number of air holes that do not allow a predetermined scattered object to pass through, and the opening is formed in a square basket shape along the entire inner circumference of the case. Arranged at a position that does not interfere with the internal structure, and with the opening formed in the anti-scattering means facing the upper case body, substantially in contact with the entire inner circumference of the upper case body It is attached with.

According to the first invention, based on the maximum value of the gap formed by the deformation of the upper case main body and the lower case main body bending portion, the depth dimension or attachment of the first scattering prevention member and the second scattering prevention member. Since the position is set, it is not necessary to take difficult cooperation as in the prior art, and the gap formed at the joint between the openings of the upper case body and the lower case body is covered by the scattering prevention means when the pressure is released. Therefore, it is possible to prevent a predetermined scattered object from being scattered outside.
In particular, in the case where the depth dimension of the lower case body is smaller than the gap dimension formed when the pressure is released, the scattered object cannot be captured only by the first scattering prevention member, but the second scattering prevention member. By attaching, it is possible to demonstrate the effectiveness of the scattering prevention means.

  According to the second invention, since the entire opening of the upper case body remains covered with the scattering prevention means, it is possible to prevent the predetermined scattered matter from being scattered outside without any cooperation as in the prior art. I can do it.

  FIG. 1A is a longitudinal sectional view showing a hermetic switch according to the first embodiment of the present invention, and FIG. 1B is a sectional view taken along line AA in FIG. FIG. 2 is a longitudinal sectional view showing a state of the hermetic switch according to the first embodiment of the present invention when the pressure is released.

  The switch case 10 is composed of an upper case body 11 and a lower case body 12 as shown in the figure.

  The upper case body 11 includes a box-shaped portion 11A that is formed in a substantially rectangular parallelepiped shape and has an open lower end, a packing contact portion 11B that protrudes horizontally from the lower end of the box-shaped portion 11A, and an outside of the packing contact portion 11B. A skirt portion 11C bent at a right angle downward from the end portion is integrally provided. The skirt portion 11C is provided so as to extend over the entire periphery of the lower end opening of the upper case main body 11, and the cross section thereof has a rectangular shape similar to that of the box-shaped portion 11A of the upper case main body. A total of four tongue-shaped upper case body side deflecting portions 11D are provided in a state where the long side portions 11C1 and 11C2 of the skirt portion 11C face each other in the longitudinal direction. It has been. A packing 21 made of rubber or the like is in contact with the packing contact portion 11B.

  The ceiling portion 11A1 of the box-shaped portion 11A of the upper case body is formed in a gable shape so as to facilitate the flow of rainwater. The side wall on the long side of the box-shaped part 11A of the upper case body (side wall along the long side of the cross-section of the box-shaped part) 11A2 and 11A3 has three bushing attachment holes 11a and 11b in the horizontal direction (horizontal direction). The bushings 13 and 14 for three phases are attached in a state where the bushing attachment holes 11a and 11b are hermetically penetrated.

  The lower case body 12 includes a rectangular bottom wall portion 12A, a standing wall portion 12B that stands vertically upward from the peripheral edge portion of the bottom wall portion 12A, and a packing holder that projects horizontally outward from the upper end of the standing wall portion 12B. The contact portion 12C and a folded portion 12D folded downward from the peripheral edge portion of the packing contact portion 12C are integrally formed. The standing wall portion 12B, the packing contact portion 12C, and the folded portion 12D are used to form a lower case. An outer frame portion 12E of the main body is formed. The outer frame portion 12E composed of the standing wall portion 12B, the overhang portion 12C, and the folded portion 12D of the lower case body is provided so as to extend over the entire peripheral edge portion of the bottom wall portion 12A, and the opposed long sides of the folded portion 12D. A total of four tongue-like lower case body side bending portions 12F projecting downward from positions corresponding to the upper case body side bending portions 11D are provided at both ends in the longitudinal direction of each portion. The lower case main body side bending portion 12F is formed in the same shape as the upper case main body side bending portion 11D, and the corresponding ones of the upper case main body side bending portion 11D and the lower case main body side bending portion 12F are overlapped with each other. The case 10 is formed by being arranged in the state of being.

  Bolt fitting holes 11D1 and 12F1 that can be aligned with each other in a state where the upper case main body side bending portion 11D and the lower case main body side bending portion 12F are penetrated, respectively, are provided, and the bolts fitted into these bolt fitting holes The superposed flexible portions 11D and 12F are fastened by the nut 22 and the nut 23 screwed to the bolt.

  The upper case main body side bending portion 11D and the lower case main body side bending portion 12F are formed in a shape that can be bent when the internal pressure of the case 10 rises (in the above-mentioned tongue shape), and the pressure in the case has an allowable value. The strength of each flexible part is set so that both the flexible parts are plastically deformed and a pressure-release gap is formed between the lower case body 12 and the opening at the lower end of the upper case body 11. .

  The upper case main body side bending portion 11D, the lower case main body side bending portion 12F, the bolt 22 and the nut 23 constitute a pressure release device.

  The hermetic switch shown in FIG. 1 is provided with scattering preventing means 31 including a first scattering preventing member 31A and a second scattering preventing member 31B. The first scattering prevention member 31 </ b> A is attached via an attachment seat 32 </ b> A attached to the box-shaped portion 11 </ b> A of the upper case body 11. The second scattering prevention member 31B is attached via an attachment seat 32B attached to the standing wall portion 12B of the lower case main body 12.

  The first scattering prevention member 31A and the second scattering prevention member 31B are formed in a rectangular cylindrical shape, and are made of, for example, a metal having a large number of air holes 31C that do not allow a predetermined scattering object to pass through. It is formed by welding two U-shaped members obtained by bending the belt-shaped plate material, and is disposed along the entire inner circumference of the case 10 at a position that does not interfere with the internal structure.

  The mounting seat 32A is attached by welding, for example, a metal bar-like plate material to the entire inner periphery of the box-like portion 11A of the upper case body 11, and the mounting seat 32B is made of, for example, a small rectangular plate material made of metal. It is attached by welding to the center of each of the four sides of the wall 12B.

  The first scattering prevention member 31A is attached to the mounting seat 32A, and the second scattering prevention metal fitting 31B is attached to the mounting seat 32B with screws in a state where the lower end thereof is in contact with the bottom wall portion 12A of the lower case body 12. ing.

  The first scattering prevention member 31A and the second scattering prevention member 31B are close to each other so as not to contact or pass predetermined scattering objects in an appropriate overlapping state. By comprising in this way, the scattering prevention means 31 will cover the connection part of the opening parts of the upper case main body 11 and the lower case main body 12 over a perimeter.

  When a ground fault or short circuit accident occurs in the case, the pressure in the case rises abnormally due to the occurrence of an arc, so that the lower case body 12 is pushed downward as shown in FIG. 11D and 12F are plastically deformed so as to open outward, and a gap for gas discharge is formed between the outer frame portion 12E of the lower case body 12 and the lower end of the upper case body 11. Therefore, the gas in the case flows out to the outside through the gap D as shown by the arrow in FIG. 2, and the explosion of the case 10 is prevented. Further, each bending portion is provided so that a gas discharge gap is formed between the lower case main body and the upper case main body by finally plastically deforming when the internal pressure of the case increases.

  The first scattering prevention member 31A and the second scattering prevention member 31B are in the above overlapping state while moving relative to each other in the vertical direction while maintaining close proximity so that they do not contact or pass predetermined scattering objects when the pressure is released. The first scattering prevention member 31A and the second scattering prevention member are based on the maximum value of the gap D formed by the deformation of the upper case main body side bending portion 11D and the lower case main body bending portion 12F. A depth dimension or mounting position of 31B is set. That is, it is not necessary to take difficult cooperation as in the prior art.

  In such a configuration, when the pressure is released, the gap formed in the coupling portion between the openings of the upper case body 11 and the lower case body 12 remains covered by the scattering prevention means 31, so that the scattered matter is not released to the outside. . In particular, in the case where the depth dimension of the lower case body is smaller than the gap dimension formed when the pressure is released, the scattered object cannot be captured only by the first scattering prevention member, but the second scattering prevention member. By attaching, the effectiveness of the scattering prevention means is exhibited.

  In this embodiment, the first scattering prevention member 31A is disposed on the inner side and the second scattering prevention member 31B is disposed on the outer side. However, the first scattering prevention member 31A is disposed on the outer side, and the second scattering prevention member 31B is disposed on the outer side. It may be arranged inside.

  In addition, the scattering prevention means 31 is formed in a rectangular cylindrical shape by abutting the strip-shaped plate material, but may be attached with a gap that does not allow a predetermined scattering object to pass through the abutting portion without welding. Further, the scattering prevention means 31 may be used as a ground barrier. In this case, the scattering prevention means 31 is an insulator.

  The first scattering prevention member 31A is attached to the box-shaped portion 11A of the upper case body 11, and the second scattering prevention member 31B is attached to the standing wall portion 12B or the bottom wall portion 12A of the lower case body 12, respectively. You may attach directly, without going through 32B.

  In addition, the second scattering prevention member 31B is attached in a state where the lower end portion thereof is in contact with the bottom wall portion 12A of the case main body lower portion 12, but is in a state where the second scattering prevention member 31B is close enough not to allow a predetermined scattering object to pass through. It may be attached with.

  FIG. 3A is a longitudinal sectional view showing a hermetic switch according to the second embodiment of the present invention, and FIG. 3B is a sectional view taken along the line AA in FIG. FIG. 4 is a longitudinal sectional view showing a state of the closed switch according to the second embodiment of the present invention when the pressure is released.

  The airtight switch shown in FIG. 3 is provided with a single scattering prevention means 51, which is attached via an attachment seat 52 attached to the box-shaped portion 11A of the upper case body 11. Further, a metal plate member having an opening formed in a square cage shape and having a mounting portion 51A and a cage portion 51B, for example, a large number of air holes 51C that do not allow predetermined scattered objects to pass through. It is formed by pressing and is disposed at a position that does not interfere with the internal structure along the entire inner circumference of the case 10.

  The mounting seat 52 is, for example, a metal bar-like plate material attached by welding to the entire inner periphery of the box-shaped portion 11A of the upper case body 11, and the scattering prevention means 51 is screwed in a state of being in contact with the mounting portion 51A. It is attached with. With this configuration, the scattering prevention means 51 covers the entire opening of the upper case body 11.

  In such a configuration, a gap is formed at the joint between the openings of the upper case body 11 and the lower case body 12 when the pressure is released, but the entire opening of the upper case body 11 is also in FIG. As shown, since it is still covered by the scattering prevention means 51, the predetermined scattered matter is not released to the outside. That is, it is not necessary to take the conventional cooperation at all regardless of the gap D formed at the time of pressure release.

  The scattering prevention means 51 may also be used as a ground barrier. In this case, the scattering prevention means 51 is an insulator.

  Further, the cage shape of the scattering prevention means 51 includes a square shape of the opening and the cage portion 51B having a bowl shape.

  Note that the second scattering prevention member 31B of the first embodiment may have a square cage shape as in the scattering prevention means 51 of the second embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS (A) is a longitudinal cross-sectional view which shows the closed type switch concerning the 1st Embodiment of this invention, (B) is an AA sectional view taken on the line of (A). It is a longitudinal cross-sectional view which shows the state at the time of the pressure release of the closed type switch concerning the 1st Embodiment of this invention. (A) is a longitudinal cross-sectional view which shows the closed type switch concerning the 2nd Embodiment of this invention, (B) is the AA sectional view taken on the line of (A). It is a longitudinal cross-sectional view which shows the state at the time of the pressure release of the closed type switch concerning the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Case 11 Upper case main body 11D Upper case main body side bending part 12 Lower case main body 12F Lower case main body side bending part 21 Packing 31, 51 Scatter prevention means 31C, 51C Vent hole 31A 1st scattering prevention member 31B 2nd scattering prevention Member D Clearance

Claims (2)

A case having an upper case body having a lower end opened, and a lower case body disposed inside the opening at the lower end of the upper case body and hermetically closing the opening through a packing;
An internal structure housed in the case, and a plurality of upper case body side flexures are integrally provided at the lower end of the upper case body,
The lower case body is integrally provided with a plurality of lower case body side bending portions corresponding to the plurality of upper case body side bending portions, respectively, and each lower case body side bending portion is superposed on the corresponding upper case body side bending portion. The upper case body and the lower case body are joined to each other in the state where the case is formed,
The upper case body side bending portion and the lower case body side bending portion form a gap between the opening portions of the upper case body and the lower case body by deforming both of the bending portions when the pressure in the case exceeds an allowable value. The strength of each flexure is set to
A hermetic switch provided with anti-scattering means for preventing debris of the internal structure from scattering from the gap to the outside of the case when the pressure is released;
The anti-scattering means comprises a first anti-scattering member formed of a strip-shaped plate member having a large number of air holes that do not allow a predetermined scattering object to pass therethrough, and the opening is formed into a square cylinder, and the opening is a square cylinder. A second anti-scattering member formed in the shape of a cage or a cage,
Arranged so as not to interfere with the internal structure along the entire inner circumference of the case, and arranged so as to cover the joint between the openings of the upper case body and the lower case body over the entire circumference. ,
The first scattering prevention member is attached in a state of substantially contacting the entire inner circumference of the upper case body,
The second scattering prevention member is attached in contact with or in close proximity to the entire inner circumference of the lower case body,
The first anti-scattering member and the second anti-scattering member are close to each other so as not to contact or pass predetermined scattering objects in an appropriate overlapping state,
At the time of pressure release, the first scattering prevention member and the second scattering prevention member are relatively moved in the vertical direction while maintaining a contact or proximity state in an appropriate overlapping state, so that the overlapping state is ensured. A hermetic switch in which the depth dimension or the mounting position of the first scattering prevention member and the second scattering prevention member is set. A case having an upper case body having a lower end opened, and a lower case body disposed inside the opening at the lower end of the upper case body and hermetically closing the opening through a packing;
An internal structure housed in the case, and a plurality of upper case body side flexures are integrally provided at the lower end of the upper case body,
The lower case body is integrally provided with a plurality of lower case body side bending portions corresponding to the plurality of upper case body side bending portions, respectively, and each lower case body side bending portion is superposed on the corresponding upper case body side bending portion. The upper case body and the lower case body are joined to each other in the state where the case is formed,
The upper case body side bending portion and the lower case body side bending portion form a gap between the opening portions of the upper case body and the lower case body by deforming both of the bending portions when the pressure in the case exceeds an allowable value. The strength of each flexure is set to
A hermetic switch provided with anti-scattering means for preventing debris of the internal structure from scattering from the gap to the outside of the case when the pressure is released;
The scattering prevention means is composed of a strip-shaped plate material having a large number of ventilation holes that do not allow a predetermined scattered matter to pass therethrough, and the opening is formed in a square basket shape,
It is arranged at a position that does not interfere with the internal structure along the entire inner circumference of the case, and the opening formed in the scattering prevention means is arranged toward the upper case body,
A hermetic switch attached in a state of being substantially in contact with the entire inner periphery of the upper case body.

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