JP6846041B2

JP6846041B2 - Switch pressure release structure

Info

Publication number: JP6846041B2
Application number: JP2017134713A
Authority: JP
Inventors: 和幸内呂; 史展菊地; 央成佐藤
Original assignee: 株式会社三英社製作所
Priority date: 2017-07-10
Filing date: 2017-07-10
Publication date: 2021-03-24
Anticipated expiration: 2037-07-10
Also published as: JP2019016557A

Description

この発明は、密封型の開閉器の放圧構造に関するものである。 The present invention relates to a pressure release structure of a sealed switch.

従来から、密封型の開閉器においては、開閉器の内部で短絡事故等が発生し、内部の圧力が上昇すると、放圧弁等からなる放圧構造を動作させて、開閉器の密封を破って放圧させ、開閉器本体の変形や爆発を防いでいる。この放圧構造は、短絡事故発生時等の異常時には、放圧を速やかに行うために機械的強度が弱い一方、通常時には強靭な耐久力が必要とされる。 Conventionally, in a sealed switch, when a short-circuit accident or the like occurs inside the switch and the internal pressure rises, the pressure release structure consisting of a pressure release valve or the like is operated to break the seal of the switch. The pressure is released to prevent deformation and explosion of the switch body. This pressure release structure has a weak mechanical strength in order to quickly release the pressure in the event of an abnormality such as a short circuit accident, but is usually required to have a strong durability.

例えば、図１１に示すように、特許文献１では、開閉器本体７１の上端開口部の側壁から水平に突出するが如く設けられた板状固定金具７４に、ボルト７２及びナット８１で取付けた蓋締付金具７３によって、上蓋７６の周囲がパッキン７８を介して開閉器本体７１に圧着される構成が開示されている。 For example, as shown in FIG. 11, in Patent Document 1, a lid attached by a bolt 72 and a nut 81 to a plate-shaped fixing bracket 74 provided so as to project horizontally from the side wall of the upper end opening of the switch main body 71. A configuration is disclosed in which the periphery of the upper lid 76 is crimped to the switch body 71 via the packing 78 by the tightening metal fitting 73.

公開実用新案昭和５３−１６１２６５号公報Public Utility Model Showa 53-161265 Gazette

しかしながら、特許文献１の構成では、開閉器本体７１の内部圧力が上昇し、放圧構造が動作する際、ボルト７２の締付程度や上蓋７６の取付状態により、蓋締付金具７３の変形の度合がその都度異なる。蓋締付金具７３の変形が小さい場合、内部圧力を放出しきれず、開閉器本体７１や上蓋７６の変形が大きくなり、大きく開いた開口部より破損物が外部に噴き出して二次被害を引き起こす恐れがあった。 However, in the configuration of Patent Document 1, when the internal pressure of the switch main body 71 rises and the pressure release structure operates, the lid tightening metal fitting 73 is deformed depending on the degree of tightening of the bolt 72 and the mounting state of the upper lid 76. The degree is different each time. If the deformation of the lid tightening bracket 73 is small, the internal pressure cannot be completely released, the deformation of the switch body 71 and the upper lid 76 becomes large, and there is a risk that damaged objects will be ejected to the outside from the wide opening, causing secondary damage. was there.

そこで、この発明は、上述の課題を解決した上で、開閉器及び蓋が大きく変形することなく、開閉器の内部圧力を放出できる開閉器の放圧構造を提供することを目的としたものである。 Therefore, an object of the present invention is to provide a switch pressure release structure capable of releasing the internal pressure of the switch without significantly deforming the switch and the lid after solving the above-mentioned problems. is there.

請求項１の発明は、
蓋と開閉器との間にパッキンを挟み込んで、内部の気密性を保つ開閉器の放圧構造において、
前記蓋の外周の適宜の箇所には、垂直方向に蓋貫通孔が設けられ、
前記開閉器は、各側壁の上端又は下端を外側略水平に折り曲げて形成された外縁部が設けられ、
当該外縁部の前記蓋貫通孔と対応する箇所には、垂直方向に外縁貫通孔が設けられ、
前記蓋貫通孔、前記外縁貫通孔、及び垂直方向に貫通可能な放圧具に、ボルトを通して、ナットを螺着することにより、前記蓋、前記パッキン、前記外縁部、前記放圧具が締め付け固定され、
前記放圧具は、垂直上向き又は垂直下向きの所定以上の荷重が加えられると、塑性変形して上部と下部の間隔が短くなる、あるいは上部と下部が当接する、開閉器の放圧構造とした。 The invention of claim 1 is
In the pressure release structure of the switch that keeps the internal airtightness by sandwiching the packing between the lid and the switch.
A lid through hole is provided in a vertical direction at an appropriate position on the outer circumference of the lid.
The switch is provided with an outer edge formed by bending the upper end or the lower end of each side wall substantially horizontally to the outside.
An outer edge through hole is provided in the vertical direction at a portion of the outer edge portion corresponding to the lid through hole.
The lid, the packing, the outer edge portion, and the pressure release tool are tightened and fixed by screwing a nut through a bolt through the lid through hole, the outer edge through hole, and a pressure release tool that can penetrate in the vertical direction. Being done
The pressure release tool has a pressure release structure of a switch in which the distance between the upper part and the lower part is shortened or the upper part and the lower part are in contact with each other due to plastic deformation when a load of a predetermined value or more in the vertical upward direction or the vertical downward direction is applied. ..

また、請求項２の発明は、
前記ボルトが、前記蓋貫通孔、前記外縁貫通孔、及び前記放圧具に対向する外周箇所は螺子が切られていない、請求項１に記載の開閉器の放圧構造とした。 Further, the invention of claim 2 is
The pressure release structure of the switch according to claim 1, wherein the bolt has no screw cut at the lid through hole, the outer edge through hole, and the outer peripheral portion facing the pressure release tool.

また、請求項３の発明は、
前記放圧具が、板状体を折り曲げて縦断面略コの字に形成され、上片の一側から前記ボルトが貫通可能な切欠きが設けられ、下片に前記ボルトが貫通可能な放圧具貫通孔が設けられた、請求項１又は２に記載の開閉器の放圧構造とした。 Further, the invention of claim 3 is
The pressure release tool is formed by bending a plate-like body into a substantially U-shape in vertical cross section, and a notch through which the bolt can penetrate is provided from one side of the upper piece, and the bolt can penetrate through the lower piece. The pressure release structure of the switch according to claim 1 or 2, which is provided with a pressure tool through hole.

また、請求項４の発明は、
前記放圧具が、板状体を折り曲げて縦断面略コの字に形成され、上片及び下片に、前記ボルトが貫通可能な放圧具貫通孔が設けられた、請求項１又は２に記載の開閉器の放圧構造とした。 Further, the invention of claim 4 is
Claim 1 or 2 in which the pressure release tool is formed by bending a plate-like body into a substantially U-shaped vertical cross section, and the upper piece and the lower piece are provided with pressure release tool through holes through which the bolt can penetrate. The pressure release structure of the switch described in 1.

また、請求項５の発明は、
前記放圧具が、縦断面円状、あるいは縦断面多角形状のパイプで形成され、上部及び下部に、前記ボルトが貫通可能な放圧具貫通孔が設けられた、請求項１又は２に記載の開閉器の放圧構造とした。 Further, the invention of claim 5 is
The pressure release tool according to claim 1 or 2, wherein the pressure release tool is formed of a pipe having a circular vertical cross section or a polygonal vertical cross section, and a pressure release tool through hole through which the bolt can penetrate is provided at an upper portion and a lower portion. The pressure release structure of the switch was adopted.

また、請求項６の発明は、
前記開閉器が、
上面が開口された箱形に形成され、当該開口部を閉鎖するように前記蓋が被着され、
当該蓋の上方に位置し、前記開閉器に固定される一対の吊下金具を更に有し、
当該吊下金具は、
板状で、上縁の略中心にフックが貫通可能な貫通孔が設けられている垂直な主体部と、
当該主体部の長手方向の両端を略直角に折り曲げて形成された一対の補助部と、
当該各補助部の下縁を相対向するように略水平に折り曲げて、吊下金具貫通孔が設けられている接続部により形成され、
前記吊下金具貫通孔に前記ボルトを通して、前記ナットを螺着することにより、前記開閉器に前記吊下金具が締め付け固定された、請求項１〜５のいずれかに記載の開閉器の放圧構造とした。 Further, the invention of claim 6 is
The switch
The upper surface is formed in an open box shape, and the lid is attached so as to close the opening.
It further has a pair of hanging brackets located above the lid and fixed to the switch.
The hanging bracket is
A vertical main body that is plate-shaped and has a through hole through which a hook can pass through at approximately the center of the upper edge.
A pair of auxiliary parts formed by bending both ends of the main body in the longitudinal direction at substantially right angles,
The lower edges of the auxiliary parts are bent substantially horizontally so as to face each other, and are formed by a connecting part provided with a hanging metal fitting through hole.
The pressure release of the switch according to any one of claims 1 to 5, wherein the suspension fitting is tightened and fixed to the switch by passing the bolt through the suspension metal fitting through hole and screwing the nut. The structure was used.

請求項１の発明によれば、短絡事故等が発生し、開閉器の内部圧力が上昇すると、この内部圧力に比例して、蓋の内側に垂直上向き又は垂直下向きの荷重が加えられ、ボルト及びナットを介して放圧具にも加えられる。そして、開閉器の内部圧力が所定の値を超えると、蓋の内側に加えられた垂直上向き又は垂直下向きの荷重が、ボルト及びナットを介して放圧具へ所定の値を超えて加えられることにより、放圧具は塑性変形して上部と下部の間隔が短くなる、あるいは上部と下部が当接する。その結果、蓋が持ち上がり又は下がり、開閉器や蓋を大きく変形させることなく、開閉器内の内部圧力が外部に放出される。 According to the invention of claim 1, when a short circuit accident or the like occurs and the internal pressure of the switch rises, a vertically upward or vertical downward load is applied to the inside of the lid in proportion to the internal pressure, and the bolt and the switch It is also added to the pressure release tool via the nut. Then, when the internal pressure of the switch exceeds a predetermined value, a vertically upward or vertical downward load applied to the inside of the lid is applied to the pressure release device via a bolt and a nut in excess of the predetermined value. As a result, the pressure release tool is plastically deformed to shorten the distance between the upper part and the lower part, or the upper part and the lower part come into contact with each other. As a result, the lid is lifted or lowered, and the internal pressure inside the switch is released to the outside without significantly deforming the switch or the lid.

請求項２の発明によれば、ボルトの蓋貫通孔、外縁貫通孔、及び放圧具に対向する外周箇所は螺子が切られていない螺子なし部を、ボルトに設けたことによって、つまり、ボルトの先端から所定の位置までしか螺子が切られていないことによって、組立作業者等がボルトにナットを螺着させる際に、誰が螺着させても同じ位置までしか螺着させることができず、蓋、パッキン、外縁部、放圧具等を締め付ける荷重を一定にすることができる。また、開閉器の内部圧力が上昇して所定の値を超え、蓋の内側に加えられた垂直上向き又は垂直下向きの、所定以上の荷重が、ボルト及びナットを介して放圧具にも加えられると、放圧具は上部と下部の間隔が短くなる、あるいは上部と下部が当接するように塑性変形するが、ボルトの放圧具が対向する外周箇所は、螺子が切られていないため、放圧具が塑性変形する際に、引っ掛かる等妨害とならない。 According to the invention of claim 2, the bolt is provided with a screwless portion in which the lid through hole, the outer edge through hole, and the outer peripheral portion facing the pressure release tool are not threaded, that is, the bolt. Since the screw is cut only from the tip of the bolt to a predetermined position, when an assembly worker or the like screwed a nut to a bolt, no matter who screwed it, it could only be screwed to the same position. The load for tightening the lid, packing, outer edge, pressure release tool, etc. can be made constant. In addition, the internal pressure of the switch increases to exceed a predetermined value, and a vertically upward or vertical downward load applied to the inside of the lid is applied to the pressure release tool via bolts and nuts. Then, the pressure release tool is plastically deformed so that the distance between the upper part and the lower part becomes shorter, or the upper part and the lower part come into contact with each other. When the pressure tool is plastically deformed, it does not interfere with the plastic deformation such as being caught.

請求項３及び４の発明によれば、放圧具を、板状体を折り曲げて縦断面略コの字に形成したことによって、開閉器の内部圧力が低い通常時は、塑性変形せず、異常時に、放圧具に垂直上向き又は垂直下向きの所定以上の荷重が加えられると、上部（上片）と下部（下片）の間隔が短くなる、あるいは上部（上片）と下部（下片）が当接するように塑性変形するという要求に、適切に応えることができる。 According to the inventions of claims 3 and 4, the pressure release tool is formed by bending a plate-like body into a substantially U-shaped vertical cross section, so that the pressure release tool does not undergo plastic deformation under normal conditions when the internal pressure of the switch is low. At the time of abnormality, if a load exceeding a predetermined value vertically upward or vertically downward is applied to the pressure release device, the distance between the upper part (upper piece) and the lower part (lower piece) becomes shorter, or the upper part (upper piece) and the lower part (lower piece) become shorter. ) Can be appropriately met to the demand for plastic deformation so as to abut.

また特に、請求項３の発明によれば、放圧具の上片の一側からボルトが貫通可能な切欠きが設けられていることにより、つまり、上片の一側が開放されていることにより、放圧具が上部（上片）と下部（下片）の間隔が短くなる、あるいは上部（上片）と下部（下片）が当接するように塑性変形する際に、上片が斜めになってボルトに引っ掛かったり・食い込んでしまって塑性変形を妨げる可能性を減少させることができる。 Further, in particular, according to the invention of claim 3, the notch through which the bolt can penetrate is provided from one side of the upper piece of the pressure release tool, that is, one side of the upper piece is open. , When the pressure release tool is plastically deformed so that the distance between the upper part (upper piece) and the lower part (lower piece) becomes shorter, or the upper part (upper piece) and the lower part (lower piece) come into contact with each other, the upper piece is slanted. It is possible to reduce the possibility of being caught in the bolt or biting into the bolt and hindering plastic deformation.

請求項５の発明によれば、放圧具を、縦断面円状、あるいは縦断面多角形状のパイプで形成したことによって、開閉器の内部圧力が低い通常時は、塑性変形せず、異常時に、放圧具に垂直上向き又は垂直下向きの所定以上の荷重が加えられると、上部と下部の間隔が短くなる、あるいは上部と下部が当接するように塑性変形するという要求に、適切に応えることができる。 According to the invention of claim 5, since the pressure release tool is formed of a pipe having a circular vertical cross section or a polygonal vertical cross section, the internal pressure of the switch is low in normal times and does not undergo plastic deformation, and in an abnormal situation. When a load exceeding a predetermined value of vertical upward or vertical downward is applied to the pressure release device, the distance between the upper part and the lower part is shortened, or the demand for plastic deformation so that the upper part and the lower part are in contact with each other is appropriately met. it can.

請求項６の発明によれば、吊下金具が、一枚の板材により溶接することなく切断・打ち抜き等により形成可能な構成であるため、例えば、プレス加工等の簡単な製造方法で作ることができ、大幅なコストダウンを図ることができる。また、この吊下金具は、開閉器の蓋、開閉器、及び放圧具と一緒に、ボルトを通してナットを螺着することにより、開閉器に固定可能な構成であるため、別途接続具を用いて、吊下金具と開閉器を接続する必要がなく、便宜である。 According to the invention of claim 6, since the hanging metal fitting has a structure that can be formed by cutting, punching, etc. without welding with a single plate material, it can be manufactured by a simple manufacturing method such as press working, for example. It can be done, and a significant cost reduction can be achieved. In addition, since this hanging bracket can be fixed to the switch by screwing a nut through a bolt together with the switch lid, switch, and pressure release tool, a separate connector is used. Therefore, it is not necessary to connect the hanging bracket and the switch, which is convenient.

この発明の実施の形態例の全体を示す斜視図である。It is a perspective view which shows the whole of the Example of Embodiment of this invention. この発明の実施の形態例の開閉器の放圧構造を示す断面図である。It is sectional drawing which shows the pressure release structure of the switch of the Embodiment of this invention. この発明の実施の形態例の開閉器の放圧構造を示す断面図である。It is sectional drawing which shows the pressure release structure of the switch of the Embodiment of this invention. この発明の実施の形態例の段付ボルトの構成を示す正面図である。It is a front view which shows the structure of the step bolt of the Example of Embodiment of this invention. この発明の実施の形態例の放圧具の構成を示す斜視図である。It is a perspective view which shows the structure of the pressure release tool of the Example of Embodiment of this invention. この発明の他の実施の形態例の放圧具の構成を示す斜視図である。It is a perspective view which shows the structure of the pressure release tool of the other Embodiment example of this invention. この発明の他の実施の形態例の放圧具の構成を示す斜視図である。It is a perspective view which shows the structure of the pressure release tool of the other Embodiment example of this invention. この発明の実施の形態例の吊下金具の構成を示す斜視図である。It is a perspective view which shows the structure of the hanging metal fitting of the Example of Embodiment of this invention. この発明の実施の形態例の開閉器の放圧構造の放圧時の動作を示す説明図であり、（a）は、開閉器の内部圧力が低い通常時の状態を示しており、（b）は、開閉器の内部圧力が所定の値を超えた異常時の状態を示している。It is explanatory drawing which shows the operation at the time of pressure release of the pressure release structure of the switch of the Embodiment of this invention, (a) shows the state in a normal state where the internal pressure of a switch is low, (b). ) Indicates the state at the time of abnormality when the internal pressure of the switch exceeds a predetermined value. この発明の他の実施の形態例の放圧具の構成を示す斜視図である。It is a perspective view which shows the structure of the pressure release tool of the other Embodiment example of this invention. この発明の従来例の開閉器の放圧構造を示す断面図である。It is sectional drawing which shows the pressure release structure of the switch of the prior art of this invention.

＜開閉器１の構成＞
以下、この発明の実施の形態例を図に基づいて説明する。図１はこの発明の実施の形態例の全体を示す斜視図である。図１に示すように開閉器１は、電柱の腕金１１（図８参照）等に、吊下フック１０、吊下金具６を介して吊下・取り付けられる。開閉器１のケース２は、上面が開口された箱形に形成されており、この開口部を閉鎖するように、例えば気密保持用のゴム製や樹脂製のパッキン７（図２参照）を介して、蓋３が被着されている。なお、パッキン７は、ケース２の開口部に沿って環状に設けられている。また、開閉器１のケース２の長手方向の各側壁２１からはブッシング２２が貫装されている。 <Structure of switch 1>
Hereinafter, examples of embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the entire embodiment of the present invention. As shown in FIG. 1, the switch 1 is suspended and attached to a utility pole arm 11 (see FIG. 8) or the like via a hanging hook 10 and a hanging metal fitting 6. The case 2 of the switch 1 is formed in a box shape with an open upper surface, and for example, a rubber or resin packing 7 for maintaining airtightness (see FIG. 2) is used to close the opening. The lid 3 is attached. The packing 7 is provided in an annular shape along the opening of the case 2. Further, bushings 22 are pierced from each side wall 21 in the longitudinal direction of the case 2 of the switch 1.

また、図２に示すように、開閉器１のケース２の各側壁２１には、各側壁２１の上端を外側略水平に折り曲げて形成された外縁部２３が設けられている。外縁部２３の適宜の箇所には垂直方向に、外縁貫通孔が設けられている（図示省略）。 Further, as shown in FIG. 2, each side wall 21 of the case 2 of the switch 1 is provided with an outer edge portion 23 formed by bending the upper end of each side wall 21 substantially horizontally to the outside. An outer edge through hole is provided in an appropriate position of the outer edge portion 23 in the vertical direction (not shown).

蓋３の、外縁貫通孔と対応する箇所には、垂直方向に蓋貫通孔が設けられている（図示省略）。なお、図１に示す構成では、ケース２の長手方向に沿って各側縁に３個、ケース２の短手方向に沿って各側縁に２個の外縁貫通孔及び蓋貫通孔が設けられている構成が開示されている。 A lid through hole is provided in the vertical direction at a portion of the lid 3 corresponding to the outer edge through hole (not shown). In the configuration shown in FIG. 1, three outer edge through holes and two lid through holes are provided on each side edge along the longitudinal direction of the case 2 and two on each side edge along the lateral direction of the case 2. The configuration is disclosed.

＜開閉器１の放圧構造＞
次に、開閉器１の放圧構造について説明する。放圧構造には、吊下金具６の接続部６５（後述）が含まれる箇所と、含まれない箇所がある。まず、図２に示すように、吊下金具６の接続部６５が含まれる箇所については、蓋貫通孔、外縁貫通孔、吊下金具貫通孔６４（後述）、及び放圧具５に段付ボルト４を通して、ナット８を螺着することにより、蓋３、パッキン７、開閉器１の外縁部２３、吊下金具６の接続部６５、放圧具５が締め付け固定されている。一方、図３に示すように、吊下金具６の接続部６５が含まれない箇所については、蓋貫通孔、外縁貫通孔、及び放圧具５に段付ボルト４を通して、ナット８を螺着することにより、蓋３、パッキン７、開閉器１の外縁部２３、放圧具５が締め付け固定されている。 <Pressure release structure of switch 1>
Next, the pressure release structure of the switch 1 will be described. The pressure release structure includes a portion including a connection portion 65 (described later) of the hanging metal fitting 6 and a portion not including the connection portion 65 (described later). First, as shown in FIG. 2, the portion including the connecting portion 65 of the hanging metal fitting 6 is provided with a step through the lid through hole, the outer edge through hole, the hanging metal fitting through hole 64 (described later), and the pressure release tool 5. By screwing the nut 8 through the bolt 4, the lid 3, the packing 7, the outer edge 23 of the switch 1, the connecting portion 65 of the hanging metal fitting 6, and the pressure release tool 5 are tightened and fixed. On the other hand, as shown in FIG. 3, at the portion where the connecting portion 65 of the hanging metal fitting 6 is not included, the nut 8 is screwed through the lid through hole, the outer edge through hole, and the pressure release tool 5 through the stepped bolt 4. By doing so, the lid 3, the packing 7, the outer edge 23 of the switch 1, and the pressure release tool 5 are tightened and fixed.

そして、図２では、開閉器１の外縁部２３と吊下金具６の接続部６５との間にスペーサー９を設ける構成が示されている。また、図３では、開閉器１の外縁部２３と放圧具５との間にスペーサー９を設ける構成が示されている。なお、図３では、吊下金具６の接続部６５に段付ボルト４を通して締め付け固定せず、吊下金具６の接続部６５に段付ボルト４を通して締め付け固定する箇所と厚さを合わせる必要から、スペーサー９が２つ設けられている。このスペーサー９によって、段付ボルト４の外周上の放圧具５の位置を調整することができる。このスペーサー９は、放圧具５や吊下金具６の接続部６５の位置を調整するためのものであって、必ずしも必要なものではない。例えば、スペーサー９を使用する代わりに、上片と下片の間隔がスペーサー９の厚さの分、長い放圧具を用いる構成としても良い。そのような構成の放圧具を用いることで、放圧具に垂直上向きの所定以上の荷重が加えられ、塑性変形して上部（上片）と下部（下片）の間隔が短くなる、あるいは上部（上片）と下部（下片）が当接した場合、蓋３がより高く持ち上がり、蓋３と開閉器１の隙間が大きくなるため、開閉器１の内部圧力を放出しやすくなる。 Then, FIG. 2 shows a configuration in which a spacer 9 is provided between the outer edge portion 23 of the switch 1 and the connecting portion 65 of the hanging metal fitting 6. Further, FIG. 3 shows a configuration in which a spacer 9 is provided between the outer edge portion 23 of the switch 1 and the pressure release tool 5. In FIG. 3, it is necessary to match the thickness with the portion where the stepped bolt 4 is passed through the connecting portion 65 of the hanging bracket 6 and tightened and fixed, instead of being tightened and fixed by passing the stepped bolt 4 through the connecting portion 65 of the hanging bracket 6. , Two spacers 9 are provided. With this spacer 9, the position of the pressure release tool 5 on the outer circumference of the stepped bolt 4 can be adjusted. The spacer 9 is for adjusting the position of the connecting portion 65 of the pressure release tool 5 and the hanging metal fitting 6, and is not always necessary. For example, instead of using the spacer 9, a pressure release tool may be used in which the distance between the upper piece and the lower piece is longer by the thickness of the spacer 9. By using a pressure release tool having such a configuration, a load of a predetermined value or more vertically upward is applied to the pressure release tool, and the pressure release tool is plastically deformed to shorten the distance between the upper part (upper piece) and the lower part (lower piece), or When the upper part (upper piece) and the lower part (lower piece) come into contact with each other, the lid 3 is lifted higher and the gap between the lid 3 and the switch 1 becomes larger, so that the internal pressure of the switch 1 is easily released.

また、図４に示すように、段付ボルト４は、先端から所定の位置まで螺子が切られている螺子部４１と、所定の位置以降の、蓋貫通孔、外縁貫通孔、吊下金具貫通孔、及び放圧具５に対向する外周箇所は螺子が切られていない螺子なし部４２が設けられている。そして、螺子なし部４２の外周は、螺子部４１の外周よりも大きく、螺子なし部４２と螺子部４１の境には、段４３が形成されている。そのため、組立作業者等が段付ボルト４にナット８を螺着させる際に、誰が螺着させても同じ位置までしか螺着させることができず、蓋３、パッキン７、外縁部２３、吊下金具６の接続部６５、放圧具５を締め付ける荷重を一定にすることができる。また、開閉器１の内部圧力が上昇して所定の値を超え、蓋の内側に加えられた垂直上向きの、所定以上の荷重が、段付ボルト４及びナット８を介して放圧具５にも加えられると、放圧具５は上部（上片）と下部（下片）の間隔が短くなる、あるいは上部（上片）と下部（下片）が当接するように塑性変形するが、段付ボルト４の放圧具５が対向する外周箇所は、螺子が切られていないため、放圧具５が塑性変形する際に、引っ掛かる等妨害とならない。 Further, as shown in FIG. 4, the stepped bolt 4 has a screw portion 41 in which a screw is cut from the tip to a predetermined position, and a lid through hole, an outer edge through hole, and a hanging metal fitting penetration after the predetermined position. The hole and the outer peripheral portion facing the pressure release tool 5 are provided with a screwless portion 42 in which the screw is not cut. The outer circumference of the screwless portion 42 is larger than the outer circumference of the screw portion 41, and a step 43 is formed at the boundary between the screwless portion 42 and the screw portion 41. Therefore, when an assembly worker or the like screwes the nut 8 onto the stepped bolt 4, no matter who screwes the nut 8, the nut 8 can be screwed only to the same position, and the lid 3, the packing 7, the outer edge 23, and the suspension can be screwed only to the same position. The load for tightening the connecting portion 65 of the lower metal fitting 6 and the pressure release tool 5 can be made constant. Further, the internal pressure of the switch 1 rises and exceeds a predetermined value, and a vertically upward load applied to the inside of the lid, which is more than a predetermined value, is applied to the pressure release tool 5 via the stepped bolt 4 and the nut 8. When also added, the pressure release tool 5 is plastically deformed so that the distance between the upper part (upper piece) and the lower part (lower piece) becomes shorter, or the upper part (upper piece) and the lower part (lower piece) come into contact with each other. Since the outer peripheral portion of the bolt 4 facing the pressure release tool 5 is not threaded, it does not interfere with the plastic release when the pressure release tool 5 is plastically deformed.

なお、本実施の形態では、先端から所定の位置まで螺子が切られている螺子部４１と、所定の位置以降の、蓋貫通孔、外縁貫通孔、吊下金具貫通孔及び放圧具５に対向する外周箇所については螺子が切られていない螺子なし部４２が設けられている段付ボルト４の構成を示したが、この構成に限定されるものではない。螺子が切られていない構成には、例えば、先端から螺子の頭部まで螺子が切られている通常のボルトに、そのボルトの先端から所定の位置以降の外周を被覆するカラーを被せて、螺着できない部分を設ける構成も含まれるものとする。また、螺子部４１の外周と螺子なし部４２の外周とが略同じで、段４３が形成されない構成としても良い。 In the present embodiment, the screw portion 41 in which the screw is cut from the tip to a predetermined position, the lid through hole, the outer edge through hole, the hanging metal fitting through hole, and the pressure release tool 5 after the predetermined position are formed. The configuration of the stepped bolt 4 provided with the screwless portion 42 in which the screw is not cut is shown for the opposite outer peripheral portion, but the configuration is not limited to this configuration. For a configuration in which the screw is not cut, for example, a normal bolt in which the screw is cut from the tip to the head of the screw is covered with a collar covering the outer circumference after a predetermined position from the tip of the bolt, and the screw is screwed. It shall also include a configuration in which a part that cannot be worn is provided. Further, the outer circumference of the screw portion 41 and the outer circumference of the screwless portion 42 may be substantially the same so that the step 43 is not formed.

次に、図５に示すように、放圧具５は、例えば金属製の板状体を折り曲げて縦断面略コの字に形成されており、上片の一側から段付ボルト４が貫通可能な切欠き５１が設けられ、下片に段付ボルト４が貫通可能な放圧具貫通孔５２が設けられている。そして、放圧具５は、垂直上向きの所定以上の荷重が加えられると、潰れる等、塑性変形して上部（上片）と下部（下片）の間隔が短くなる、あるいは上部（上片）と下部（下片）が当接する。 Next, as shown in FIG. 5, the pressure release tool 5 is formed, for example, by bending a metal plate-like body into a substantially U-shaped vertical cross section, and the stepped bolt 4 penetrates from one side of the upper piece. A possible notch 51 is provided, and a pressure release tool through hole 52 through which the stepped bolt 4 can penetrate is provided in the lower piece. Then, when a load of a predetermined value or more in the vertical upward direction is applied, the pressure release tool 5 is plastically deformed such as crushed to shorten the distance between the upper part (upper piece) and the lower part (lower piece), or the upper part (upper piece). And the lower part (lower piece) come into contact with each other.

放圧具５を、板状体を折り曲げて縦断面略コの字に形成することによって、開閉器１の内部圧力が低い通常時は、塑性変形せず、異常時に、放圧具５に垂直上向きの所定以上の荷重が加えられると、上部（上片）と下部（下片）の間隔が短くなる、あるいは上部（上片）と下部（下片）が当接するように塑性変形するという要求に、適切に応えることができる。 By bending the plate-shaped body to form the pressure release tool 5 in a substantially U-shape in vertical cross section, the switch 1 does not undergo plastic deformation in normal times when the internal pressure is low, and is perpendicular to the pressure release tool 5 in an abnormal situation. When a load exceeding a predetermined value is applied upward, the distance between the upper part (upper piece) and the lower part (lower piece) becomes shorter, or the upper part (upper piece) and the lower part (lower piece) are required to be plastically deformed so as to come into contact with each other. Can be responded appropriately.

また、放圧具５の上片の一側から段付ボルト４が貫通可能な切欠き５１が設けられていることにより、つまり、放圧具５の上片の一側が開放されていることにより、放圧具５が上部（上片）と下部（下片）の間隔が短くなる、あるいは上部（上片）と下部（下片）が当接するように塑性変形する際に、上片が斜めになって段付ボルト４に引っ掛かったり・食い込んでしまって塑性変形を妨げる可能性を減少させることができる。 Further, by providing a notch 51 through which the stepped bolt 4 can penetrate from one side of the upper piece of the pressure release tool 5, that is, by opening one side of the upper piece of the pressure release tool 5. , When the pressure release tool 5 is plastically deformed so that the distance between the upper part (upper piece) and the lower part (lower piece) becomes shorter, or the upper part (upper piece) and the lower part (lower piece) come into contact with each other, the upper piece is slanted. It is possible to reduce the possibility of being caught in or biting into the stepped bolt 4 and hindering plastic deformation.

なお、本実施の形態例では、放圧具５は、上片の一側から段付ボルト４が貫通可能な切欠き５１が設けられ、下片に段付ボルト４が貫通可能な放圧具貫通孔５２が設けられている構成を示したが、この構成に限定されるものではない。図６に示すように、例えば、上片及び下片に、段付ボルト４が貫通可能な放圧具貫通孔５２が設けられている構成としても良い。 In the example of the present embodiment, the pressure release tool 5 is provided with a notch 51 through which the stepped bolt 4 can penetrate from one side of the upper piece, and the pressure release tool 5 allows the stepped bolt 4 to penetrate through the lower piece. Although the configuration in which the through hole 52 is provided is shown, the present invention is not limited to this configuration. As shown in FIG. 6, for example, the upper piece and the lower piece may be provided with a pressure release tool through hole 52 through which the stepped bolt 4 can penetrate.

また、本実施の形態例では、放圧具５は、板状体を折り曲げて縦断面略コの字に形成する構成を示したが、この構成に限定されるものではない。例えば、放圧具として、例えば金属製の、図７に示すような縦断面円状のパイプ（＝管）、あるいは縦断面多角形状のパイプ（＝管）で形成し、上部及び下部に段付ボルト４が貫通可能な放圧具貫通孔５２が設けられる構成としても良い。 Further, in the example of the present embodiment, the pressure release tool 5 shows a configuration in which a plate-shaped body is bent to form a substantially U-shaped vertical cross section, but the present invention is not limited to this configuration. For example, as a pressure release tool, it is formed of, for example, a metal pipe (= pipe) having a circular vertical cross section as shown in FIG. 7, or a pipe (= pipe) having a polygonal vertical cross section, and is stepped on the upper part and the lower part. A pressure release tool through hole 52 through which the bolt 4 can penetrate may be provided.

放圧具を、縦断面円状、あるいは縦断面多角形状のパイプで形成したことによって、開閉器の内部圧力が低い通常時は、塑性変形せず、異常時に、放圧具に垂直上向きの所定以上の荷重が加えられると、上部と下部の間隔が短くなる、あるいは上部と下部が当接するように塑性変形するという要求に、適切に応えることができる。 By forming the pressure release tool with a pipe having a circular vertical cross section or a polygonal vertical cross section, the internal pressure of the switch is low. When the above load is applied, it is possible to appropriately meet the demand that the distance between the upper part and the lower part is shortened or the upper part and the lower part are plastically deformed so as to be in contact with each other.

＜吊下金具６の構成＞
図８に示す吊下金具６は、開閉器１を電柱の腕金１１に吊下・取り付ける役割を果たすものである。以下、詳しく説明する。なお、図８では、電柱の腕金１１に、１対の吊下金具６が吊下フック１０を介して吊下・取り付けられている状態が示されている。 <Structure of hanging bracket 6>
The hanging metal fitting 6 shown in FIG. 8 serves to suspend and attach the switch 1 to the arm 11 of the utility pole. The details will be described below. Note that FIG. 8 shows a state in which a pair of hanging metal fittings 6 are suspended and attached to the arm 11 of the utility pole via a hanging hook 10.

吊下金具６は、例えば金属製の板状で、上縁の略中心に吊下フック１０が貫通可能な貫通孔６１が設けられている垂直な主体部６２と、主体部６２の長手方向の両端を略直角に折り曲げて形成された一対の補助部６３と、各補助部６３の下縁を相対向するように略水平に折り曲げて、段付ボルト４が貫通可能な吊下金具貫通孔６４が設けられている接続部６５により形成されている。また、主体部６２の各側端には、かぎ片６６が形成されている。 The hanging metal fitting 6 is, for example, a metal plate, and has a vertical main body 62 having a through hole 61 through which the hanging hook 10 can penetrate at substantially the center of the upper edge, and a vertical main body 62 in the longitudinal direction of the main body 62. A pair of auxiliary portions 63 formed by bending both ends at substantially right angles and a hanging metal fitting through hole 64 through which the stepped bolt 4 can be penetrated by bending the lower edges of each auxiliary portion 63 substantially horizontally so as to face each other. Is formed by a connecting portion 65 provided with. Further, a key piece 66 is formed at each side end of the main body portion 62.

次に、吊下金具６と開閉器１とを固定して、電柱の腕金１１に吊下・取り付ける方法について説明する。蓋貫通孔、外縁貫通孔、吊下金具貫通孔６４、及び放圧具５に段付ボルト４を通して、ナット８を螺着することにより、蓋３、パッキン７、開閉器１の外縁部２３、吊下金具６の接続部６５、放圧具５が締め付け固定される。その結果、吊下金具６と開閉器１とが接続・固定される。そして、吊下金具６と開閉器１とが接続・固定された状態で、吊り下げロープ等を吊下金具６の各側端に設けられたかぎ片６６に引っ掛けて持ち上げ、吊下金具６の２つの貫通孔６１に吊下フック１０を夫々通して、電柱の腕金１１に吊下・取り付ける。 Next, a method of fixing the hanging metal fitting 6 and the switch 1 and suspending / attaching them to the arm 11 of the utility pole will be described. By passing the stepped bolt 4 through the lid through hole, the outer edge through hole, the hanging metal fitting through hole 64, and the pressure release tool 5, and screwing the nut 8, the lid 3, the packing 7, and the outer edge 23 of the switch 1 The connection portion 65 of the hanging metal fitting 6 and the pressure release tool 5 are tightened and fixed. As a result, the hanging metal fitting 6 and the switch 1 are connected and fixed. Then, in a state where the hanging metal fitting 6 and the switch 1 are connected and fixed, the hanging rope or the like is hooked on the hook pieces 66 provided at each side end of the hanging metal fitting 6 and lifted, and the hanging metal fitting 6-2 The hanging hooks 10 are passed through the through holes 61, respectively, and are suspended and attached to the arm 11 of the utility pole.

吊下金具６は、一枚の板材により溶接することなく切断・打ち抜き等により形成可能な構成であるため、例えば、プレス加工等の簡単な製造方法で作ることができ、大幅なコストダウンを図ることができる。また、吊下金具６は、開閉器１の蓋３、開閉器１、及び放圧具５と一緒に、段付ボルト４を通してナット８を螺着することにより、開閉器１に固定可能な構成であるため、別途接続具を用いて、吊下金具６と開閉器１を接続する必要がなく、便宜である。 Since the hanging metal fitting 6 has a structure that can be formed by cutting, punching, etc. without welding with a single plate material, it can be manufactured by a simple manufacturing method such as press working, and a significant cost reduction is achieved. be able to. Further, the hanging metal fitting 6 can be fixed to the switch 1 by screwing the nut 8 through the stepped bolt 4 together with the lid 3, the switch 1, and the pressure release tool 5 of the switch 1. Therefore, it is not necessary to connect the hanging metal fitting 6 and the switch 1 by using a separate connecting tool, which is convenient.

＜放圧時の動作＞
次に、図９を用いて、本実施の形態例に係る開閉器１の放圧構造の放圧時の動作について説明する。図９（a）のように、開閉器１の内部圧力が低い通常時は、放圧具５は塑性変形せず、縦断面略コの字が維持されている。次に、短絡事故発生時等の異常時には、開閉器１の内部圧力が上昇し、この内部圧力により、蓋３に垂直上向きの荷重がかかる。蓋３にかかった垂直上向きの荷重は、段付ボルト４及びナット８を介して、放圧具５に伝わる。 <Operation at the time of release pressure>
Next, with reference to FIG. 9, the operation of the pressure release structure of the switch 1 according to the embodiment of the present embodiment at the time of pressure release will be described. As shown in FIG. 9A, when the internal pressure of the switch 1 is low, the pressure release tool 5 is not plastically deformed and the vertical cross section is maintained in a substantially U shape. Next, in the event of an abnormality such as the occurrence of a short-circuit accident, the internal pressure of the switch 1 rises, and the internal pressure applies a vertically upward load to the lid 3. The vertically upward load applied to the lid 3 is transmitted to the pressure release tool 5 via the stepped bolt 4 and the nut 8.

さらに、開閉器１の内部圧力が上昇し所定の値を超えると、図９（b）のように、放圧具５は、縦断面略コの字を維持できなくなり、潰れる等塑性変形して、放圧具５の上部（上片）と下部（下片）の間隔が短くなる、あるいは上部（上片）と下部（下片）が当接する（図９（b）では当接している）。なお、「所定の値」とは、例えば、「０．０２MPa・G（メガパスカル・ゲージ圧）」である。放圧具５の上部（上片）と下部（下片）の間隔が短くなる、あるいは上部（上片）と下部（下片）が当接すると、その分だけ、段付ボルト４と蓋３が持ち上がる。その結果、蓋３とケース２の外縁部２３との間に隙間が生じ、隙間から開閉器１の内部圧力が放出される。 Further, when the internal pressure of the switch 1 rises and exceeds a predetermined value, as shown in FIG. 9B, the pressure release tool 5 cannot maintain a substantially U-shape in the vertical cross section, and is crushed and otherwise plastically deformed. , The distance between the upper part (upper piece) and the lower part (lower piece) of the pressure release tool 5 becomes shorter, or the upper part (upper piece) and the lower part (lower piece) come into contact with each other (in FIG. 9B, they come into contact with each other). .. The "predetermined value" is, for example, "0.02 MPa · G (megapascal gauge pressure)". When the distance between the upper part (upper piece) and the lower part (lower piece) of the pressure release tool 5 becomes shorter, or when the upper part (upper piece) and the lower part (lower piece) come into contact with each other, the stepped bolt 4 and the lid 3 are correspondingly increased. Is lifted. As a result, a gap is formed between the lid 3 and the outer edge portion 23 of the case 2, and the internal pressure of the switch 1 is released from the gap.

このように、短絡事故等が発生し、開閉器１の内部圧力が上昇して所定の値を超え、段付ボルト４及びナット８を介して放圧具５に垂直上向きの所定以上の荷重が加えられると、放圧具５は塑性変形して上部（上片）と下部（下片）の間隔が短くなる、あるいは上部（上片）と下部（下片）が当接する構成としたため、開閉器１の内部圧力が所定の値を超えた異常時には、開閉器１や蓋３を大きく変形させることなく、開閉器１の内部圧力が外部に放出される。 In this way, a short-circuit accident or the like occurs, the internal pressure of the switch 1 rises and exceeds a predetermined value, and a load of a predetermined value or more vertically upward is applied to the pressure release tool 5 via the stepped bolt 4 and the nut 8. When added, the pressure release tool 5 is plastically deformed to shorten the distance between the upper part (upper piece) and the lower part (lower piece), or the upper part (upper piece) and the lower part (lower piece) are in contact with each other. When the internal pressure of the switch 1 exceeds a predetermined value, the internal pressure of the switch 1 is released to the outside without significantly deforming the switch 1 and the lid 3.

なお、この発明の実施の形態例では、開閉器１のケース２は、上面が開口された箱形に形成されており、この開口部を閉鎖するように、例えば気密保持用のゴム製や樹脂製のパッキン７を介して、蓋３が被着される構成が開示されている。しかし、この発明の適用は、この構成に限定されるものではない。例えば、図１０に示すように、開閉器１のケース２が、下面が開口された箱形に形成されており、この開口部を閉鎖するように、パッキン７を介して、蓋３１が被着される構成においても、この発明を適用可能である。詳しくは、蓋３１の、外縁貫通孔と対応する箇所には、垂直方向に蓋貫通孔が設けられている（図示省略）。蓋貫通孔、外縁貫通孔、及び放圧具５に段付ボルト４を通して、ナット８を螺着することにより、蓋３１、パッキン７、開閉器１の外縁部２３、放圧具５が締め付け固定されている。 In the embodiment of the present invention, the case 2 of the switch 1 is formed in a box shape having an opening on the upper surface, and is made of rubber or a resin for maintaining airtightness so as to close the opening. A configuration in which the lid 3 is attached via the packing 7 made of the product is disclosed. However, the application of the present invention is not limited to this configuration. For example, as shown in FIG. 10, the case 2 of the switch 1 is formed in a box shape having an opening on the lower surface, and the lid 31 is attached via the packing 7 so as to close the opening. The present invention can also be applied to the above-mentioned configuration. Specifically, a lid through hole is provided in the vertical direction at a portion of the lid 31 corresponding to the outer edge through hole (not shown). By passing the stepped bolt 4 through the lid through hole, the outer edge through hole, and the pressure release tool 5, and screwing the nut 8, the lid 31, the packing 7, the outer edge portion 23 of the switch 1, and the pressure release tool 5 are tightened and fixed. Has been done.

但し、図１０に示す構成の場合、開閉器１と吊下金具６との接続については、別途接続具（図示省略）を用いて行う必要がある。 However, in the case of the configuration shown in FIG. 10, it is necessary to separately use a connecting tool (not shown) for connecting the switch 1 and the hanging metal fitting 6.

短絡事故等が発生し、開閉器１の内部圧力が上昇すると、この内部圧力に比例して、蓋３１の内側に垂直下向きの荷重が加えられ、段付ボルト４及びナット８を介して放圧具５にも加えられる。そして、開閉器１の内部圧力が所定の値を超えると、蓋３１の内側に加えられた垂直下向きの荷重が、段付ボルト４及びナット８を介して放圧具５へ所定の値を超えて加えられることにより、放圧具５は塑性変形して上部（上片）と下部（下片）の間隔が短くなる、あるいは上部（上片）と下部（下片）が当接する。その結果、蓋３１が下がり、開閉器１や蓋３１を大きく変形させることなく、開閉器１内の内部圧力が外部に放出される。 When a short-circuit accident or the like occurs and the internal pressure of the switch 1 rises, a vertically downward load is applied to the inside of the lid 31 in proportion to the internal pressure, and the pressure is released via the stepped bolt 4 and the nut 8. It is also added to ingredient 5. Then, when the internal pressure of the switch 1 exceeds a predetermined value, the vertically downward load applied to the inside of the lid 31 exceeds the predetermined value to the pressure release tool 5 via the stepped bolt 4 and the nut 8. The pressure release tool 5 is plastically deformed to shorten the distance between the upper part (upper piece) and the lower part (lower piece), or the upper part (upper piece) and the lower part (lower piece) come into contact with each other. As a result, the lid 31 is lowered, and the internal pressure inside the switch 1 is released to the outside without significantly deforming the switch 1 and the lid 31.

なお、この明細書では、蓋３あるいは蓋３１、パッキン７、開閉器１の外縁部２３、放圧具５等を締め付け固定する場合、放圧具５にナット８が当接する構成を示したが、段付ボルト４等とナット８の向きを逆にして、放圧具５に段付ボルト４等が当接する構成としても良い。 In this specification, when the lid 3 or the lid 31, the packing 7, the outer edge 23 of the switch 1, the pressure release tool 5, and the like are tightened and fixed, the nut 8 comes into contact with the pressure release tool 5. , The direction of the stepped bolt 4 or the like and the nut 8 may be reversed so that the stepped bolt 4 or the like comes into contact with the pressure release tool 5.

１：開閉器、
２：ケース、２１：側壁、２２：ブッシング、２３：外縁部、
３：蓋、３１：蓋、
４：段付ボルト、４１：螺子部、４２：螺子なし部、４３：段
５：放圧具、５１：切欠き、５２：放圧具貫通孔、
６：吊下金具、６１：貫通孔、６２：主体部、６３：補助部、６４：吊下金具貫通孔、６５：接続部、６６：かぎ片
７：パッキン、８：ナット、９：スペーサー、
１０：吊下フック、
１１：腕金、
７１：開閉器本体、７２：ボルト、７３：蓋締付金具、７４：板状固定金具、７６：上蓋、７８：パッキン、８１：ナット 1: Switch,
2: Case, 21: Side wall, 22: Bushing, 23: Outer edge,
3: Lid, 31: Lid,
4: Stepped bolt, 41: Screw part, 42: Screwless part, 43: Step 5: Pressure release tool, 51: Notch, 52: Pressure release tool through hole,
6: Hanging bracket, 61: Through hole, 62: Main part, 63: Auxiliary part, 64: Hanging bracket through hole, 65: Connection part, 66: Key piece 7: Packing, 8: Nut, 9: Spacer,
10: Hanging hook,
11: Arm,
71: Switch body, 72: Bolt, 73: Lid tightening bracket, 74: Plate-shaped fixing bracket, 76: Top lid, 78: Packing, 81: Nut

Claims

In the pressure release structure of the switch that keeps the internal airtightness by sandwiching the packing between the lid and the switch.
A lid through hole is provided in a vertical direction at an appropriate position on the outer circumference of the lid.
The switch is provided with an outer edge formed by bending the upper end or the lower end of each side wall substantially horizontally to the outside.
An outer edge through hole is provided in the vertical direction at a portion of the outer edge portion corresponding to the lid through hole.
The lid, the packing, the outer edge portion, and the pressure release tool are tightened and fixed by screwing a nut through a bolt through the lid through hole, the outer edge through hole, and a pressure release tool that can penetrate in the vertical direction. Being done
The pressure release tool is formed by bending a plate-shaped body into a U-shape in a vertical cross section, and the upper piece and the lower piece are provided with a pressure release tool through hole through which the bolt can penetrate, and a predetermined vertical upward or vertical downward direction is provided. When the above load is applied, the spacing of the lower piece and the upper piece is shortened by plastic deformation, or top pieces and bottom pieces are characterized by having the structure abut, relief structure of the switch.

The pressure release structure for a switch according to claim 1, wherein the bolt is not screwed at the lid through hole, the outer edge through hole, and the outer peripheral portion facing the pressure release tool.