JP2004019887A

JP2004019887A - Sealing structure of terminal box in solenoid valve

Info

Publication number: JP2004019887A
Application number: JP2002179170A
Authority: JP
Inventors: Mitsuo Sakai; 坂井　光雄; Mikio Asai; 浅井　幹夫; Yoshinobu Kobayashi; 小林　義宜; Takatoshi Kondo; 近藤　貴俊
Original assignee: Toyooki Kogyo Co Ltd
Current assignee: Toyooki Kogyo Co Ltd
Priority date: 2002-06-19
Filing date: 2002-06-19
Publication date: 2004-01-22

Abstract

PROBLEM TO BE SOLVED: To provide an excellent sealing between a terminal box body and a cover by pressing a packing between the terminal box body and the cover in different two directions. SOLUTION: The packing 34 fitted to the cover 15 comprises a first piece 34A extending in a generally horizontal direction and a second piece 34B extending in a generally vertical direction. A contact surface 35 formed in the terminal box body 14 comprises a first contact part 35A installed in the cover 15 and pressing the first piece 34A to deform the first piece in a generally vertical direction and a second contact part 35B pressing the second piece 34B to deform the second piece in a generally horizontal direction. Thus, even if a sealability between the first contact part 35A and the first piece 34A is lowered by such an action that the reaction of a pressing force acts on the cover 15 so as to raise the cover in a generally vertical direction by the pressing of the first piece 34A against the first contact part 35A, the excellent sealability can be assured without reducing the pressing force of the second piece 34B against the second contact part 35B. COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、電磁弁の電磁石と外部電源からの電気配線とを内部で電気接続する端子箱本体の開口を蓋で閉塞し、端子箱本体と蓋との間をシールするパッキンを備える電磁弁における端子箱のシール構造に関する。
【０００２】
【従来の技術】
従来の電磁弁における端子箱のシール構造は、端子箱を端子箱本体と蓋とから構成し、端子箱本体は弁本体の上部に備えて電磁石の接続ピンと外部電源からの電気配線とを内部で電気接続し、蓋は端子箱本体の上部開口を閉塞するよう周方向の４個所に配置した４個の取付ねじを締め付けて端子箱本体の上部に取付けている。そして、蓋には凹溝を周設し、この凹溝に断面が角形の環状のパッキンを装着し、端子箱本体にはパッキンの稜部を当接して撓ませる傾斜状の当接面を形成し、端子箱本体に蓋を取付けた状態では、パッキンが当接面に圧接されて端子箱本体と蓋との間をシールしている。（例えば、実公昭６４−５９０２号公報参照）。
【０００３】
【発明が解決しようとする課題】
ところが、かかる従来の電磁弁における端子箱のシール構造では、当接面にパッキンを圧接すると、この圧接力の反力が取付ねじの締め付けに抗して蓋を略垂直方向の上方へ持ち上げるよう作用するため、特に、取付ねじの配置個所から周方向に離間した個所では当接面へのパッキンの圧接力が弱まってシール性が低下し、端子箱本体と蓋との間の良好なシールが得られ難かった。
【０００４】
本発明は、端子箱本体と蓋との間でパッキンを異なる２方向に圧接し、端子箱本体と蓋との間の良好なシールを得る電磁弁における端子箱のシール構造を提供することを課題としている。
【０００５】
【課題を解決するための手段】
このため、本発明では、電磁弁の弁本体上部に備えている電磁弁における端子箱のシール構造であって、端子箱は上部を開口して電磁石と外部電源からの電気配線とを内部で電気接続する端子箱本体と、端子箱本体の上部開口を閉塞するよう複数の取付ねじを略垂直方向の下方へ向けて締め付けて端子箱本体の上部に取付ける蓋とから構成し、端子箱本体と蓋とのいずれか一方には弾力性材料から成形した環状のパッキンを装着すると共に、他方には端子箱本体への蓋の取付けでパッキンと圧接して撓ませる当接面を形成し、パッキンは略水平方向へ延在する第１片と略垂直方向へ延在する第２片とを有し、当接面は端子箱本体への蓋の取付けでパッキンの第１片と圧接して略垂直方向へ撓ませる第１当接部と、パッキンの第２片と圧接して略水平方向へ撓ませる第２当接部とを有して成る。この場合、当接面の第１当接部に略垂直方向へ突出する凸部を形成しても良い。また、パッキンの第１片に略垂直方向へ膨出する第１膨出部を形成すると共に、第２片に略水平方向へ膨出する第２膨出部を形成しても良い。さらにまた、パッキンは蓋に装着し略垂直方向へ延在する第２片の上端部に連設して第１片を略水平方向へ端子箱外方に向けて延在し、第２片の上端部と対向する下端部に第３片を連設し、第３片は略水平方向へ第１片の延在方向と対向する端子箱内方に向けて延在しても良い。さらにまた、蓋には外周縁から略水平方向へ突出して工具係合部を形成し、工具係合部と端子箱本体の上部との間に工具を挿入する挿入間隙を形成し、工具係合部は挿入隙間へ挿入した工具と係合可能に設けても良い。
【０００６】
かかる本発明によると、複数の取付ねじを略垂直方向の下方へ向けて締め付け蓋を端子箱本体の上部に取付けて端子箱本体の上部開口を閉塞し、端子箱本体への蓋の取付けで、パッキンの第１片を当接面の第１当接部に圧接して略垂直方向へ撓ませて端子箱本体と蓋との間をシールすると共に、パッキンの第２片を当接面の第２当接部に圧接して略水平方向へ撓ませて端子箱本体と蓋との間をシールする。このため、取付ねじの配置個所から周方向に離間した個所で、第１当接部への第１片の圧接において圧接力の反力が蓋を略垂直方向の上方へ持ち上げるよう作用し、第１当接部への第１片の圧接力が弱まってシール性が低下したとしても、第２片は略水平方向へ撓んで第２当接部に圧接しているから、この圧接力が蓋を略垂直方向の上方へ持ち上げる影響を受けて弱まることなくできて良好なシール性を維持でき、端子箱本体と蓋との間でパッキンを異なる２方向に圧接できて端子箱本体と蓋との間の良好なシールを得ることができる。
【０００７】
【発明の実施の形態】
以下、本発明の第１実施形態を図面に基づき説明する。
図１ないし図３において、１は電磁弁の弁本体で、略直方体形状を成し、　スプール状の弁体２を軸方向へ摺動自在に嵌挿する嵌挿孔３を内部に貫通形成し、弁本体１の両側面に開口する嵌挿孔３の両端部にはそれぞれめねじ部を螺刻している。嵌挿孔３の軸方向の略中央部には圧力流体を供給する供給流路Ｐを開口し、また、供給流路Ｐの接続個所の軸方向両側へ間隙を有して流体アクチュエータ（図示せず）に連通する２個の負荷流路Ａ、Ｂをそれぞれ開口し、さらに両負荷流路Ａ、Ｂの軸方向外側へ間隙を有して低圧側に連通する排出流路Ｒ１、Ｒ２をそれぞれ開口している。弁体２は図１の上半分に示す原位置では供給流路Ｐを負荷流路Ａに切換連通すると共に負荷流路Ｂを排出流路Ｒ２に切換連通し、図１の下半分に示す切換位置では供給流路Ｐを負荷流路Ｂに切換連通すると共に負荷流路Ａを排出流路Ｒ１に切換連通するようランド部２Ａ、２Ｂを備えている。
【０００８】
４は嵌挿孔３の一方のめねじ部に螺合した栓部材で、嵌挿孔３の弁本体１一側面への開口を閉塞している。５は栓部材４の内部に収装したばねで、弁体２を原位置に向けて付勢している。６は電磁石で、固定鉄心７を嵌挿孔３の他方のめねじ部に螺合して弁本体１の他側面に装着し、コイル８への通電により発生する吸引力で可動鉄心９を固定鉄心７に吸着し、この吸着によりピン１０を介して弁体２をばね５力に抗して原位置から切換位置に切換作動する。そして、電磁石６にはコイル８へ電気接続した２個の接続ピン１１を備え、接続ピン１１は略水平方向へ突出して設けている。
【０００９】
１３は電磁弁の弁本体１上部に備えた端子箱で、端子箱本体１４と蓋１５とから構成している。端子箱本体１４は上部を開口した略箱形状で、平面で対角線上に配置した２個の取付ねじ１６により弁本体１に取付け、対向する両側壁には外部電源からの電気配線１６Ａ、１６Ｂを導入する導入孔１７Ａ、１７Ｂをそれぞれ開口形成し、一方の導入孔１７Ａは着脱自在に螺合した栓部材１８で閉塞し、他方の導入孔１７Ｂへ着脱自在に螺合したシールコネクタ部材１９により電気配線１６Ａ、１６Ｂをシールして内部に導入している。なお、他方の導入孔１７Ｂを栓部材１８で閉塞し、一方の導入孔１７Ａにシールコネクタ部材１９を螺着して電気配線１６Ａ、１６Ｂを導入することも可能である。
【００１０】
端子箱本体１４の内部には、端子台２０及びプリント基板２１を収装して配置し、端子台２０には電気配線１６Ａ、１６Ｂを端子ねじ２２Ａ、２２Ｂにより止着する端子金具２３Ａ、２３Ｂ及び通電により点灯するネオンランプ、発光ダイオード等の表示灯２４を備え、端子金具２３Ａ、２３Ｂ、表示灯２４はそれぞれプリント基板２１に電気接続している。プリント基板２１には抵抗、コンデンサ、サージキラー等の種々の回路素子２５及び電磁石６の接続ピン１１と電気接続する２個の接続金具２６を備え、接続ピン１１と接続金具２６との電気接続は、電磁石６の弁本体１他側面への装着で接続ピン１１が端子箱本体１４の側壁下方に穿設した挿通孔２７を挿通して先端部が接続金具２６に嵌合することで成し得る。そして、プリント基板２１は端子金具２３Ａ、２３Ｂ、表示灯２４、回路素子２５、接続金具２６との間をプリント配線により電気接続して電気配線１６Ａ、１６Ｂから電磁石６への通電を可能にし、この通電で表示灯２４を点灯するようにしている。なお、２８は端子台２０を端子箱本体１４に固定するねじである。
【００１１】
蓋１５は透明色の樹脂材より成形し、４隅に配置した４個の取付ねじ２９を端子箱本体１４のねじ孔１４Ｂに螺合して略垂直方向の下方へ向けて締め付けることで端子箱本体１４に取付けて端子箱本体１４の上部開口１４Ａを閉塞し、表面には表示灯２４の点灯を外部から視認可能に表示部１５Ａを形成している。図４に示す如き、蓋１５の裏面には上部開口１４Ａの平面形状に沿った環状の凹溝３０を窪み形成すると共に、凹溝３０の略水平方向の内方へ連設して環状の支持部３１を略垂直方向の下方へ突出形成している。そして、支持部３１は、図５及び図６に示す如き、凹溝３０に連なる外面３１Ａを下方に向けて順次内方に位置する若干の傾斜面に形成している。３２Ａ、３２Ｂは蓋１５の外周縁における対向する２箇所に略水平方向へ突出して形成した工具係合部で、図６に示す如き、蓋１５を端子箱本体１４に取付けた状態で端子箱本体１４の上部との間にドライバー等の工具（図示せず）を挿入する挿入間隙３３を形成し、挿入間隙３３へ挿入した工具と係合可能に設けて蓋１５の端子箱本体１４からの取外しを容易にする。
【００１２】
３４はＮＢＲ等の弾性材料から成形した環状のパッキンで、蓋１５の凹溝３０に装着している。図５及び図６に示す如き、パッキン３４は凹溝３０に沿って水平方向へ延在する第１片３４Ａと、第１片３４Ａの水平方向の内方端へ連設して支持部３１の外面３１Ａに沿って若干傾斜して略垂直方向へ延在する第２片３４Ｂとを有している。端子箱本体１４には蓋１５の取付けでパッキン３４を圧接して撓ませる当接面３５を形成し、当接面３５はパッキン３４の第１片３４Ａと圧接して略垂直方向へ撓ませる第１当接部３５Ａと、パッキン３４の第２片３４Ｂと圧接して略水平方向へ撓ませる第２当接部３５Ｂとを有し、第１当接部３５Ａは上部開口１４Ａの外周縁に水平方向の外方へ連なる水平面であり、第２当接部３５Ｂは上部開口１４Ａの外周縁に垂直方向の下方へ連なる垂直面である。なお、第２当接部３５Ｂはパッキン３４の第２片３４Ｂが若干傾斜しているため、第２片３４Ｂの第１片３４Ａとの連設側を圧接し、第２片３４Ｂの略垂直方向の先端側との間には略水平方向へ微小な隙間が存在する。３６は断面形状が半円形で略垂直方向の上方へ向けて突出する凸部で、当接面３５の第１当接部３５Ａにおける上部開口１４Ａの外周縁近傍に沿って環状に形成している。
【００１３】
次に、かかる構成の作動を説明する。
図１における弁体２の上半分は電磁石６への非通電状態を示し、弁体２はばね５力で原位置に保持され、供給流路Ｐを負荷流路Ａに切換連通すると共に負荷流路Ｂを排出流路Ｒ２に切換連通している。
【００１４】
この状態で、外部電源の電気配線１６Ａ、１６Ｂより電磁石６のコイル８に通電すると、通電により発生する吸引力で可動鉄心９が固定鉄心７に吸着され、ピン１０を介して弁体２をばね５力に抗して図１の下半分に示す切換位置に作動し、供給流路Ｐを負荷流路Ｂに切換連通すると共に負荷流路Ａを排出流路Ｒ１に切換連通する。このとき、コイル８への通電により表示灯２４が点灯し、この点灯を外部から表示部１５Ａで視認できる。
【００１５】
そして、電磁石６を非通電にすると、弁体２はばね５力で図１の上半分に示す原位置に復帰作動され、表示灯２４は消灯する。
【００１６】
かかる作動で、電気配線１６Ａ、１６Ｂは、蓋１５を端子箱本体１４から取外した状態で、作業者が端子箱本体１４の上部開口１４Ａからドライバー等の工具を用いて端子ねじ２２Ａ、２２Ｂを端子金具２３Ａ、２３Ｂに締め付けて電気配線１６Ａ、１６Ｂを端子金具２３Ａ、２３Ｂに止着し、この後、４個の取付ねじ２９をねじ孔１４Ｂに螺合して略垂直方向の下方へ向けて締め付け蓋１５を端子箱本体１４に取付けて端子箱本体１４の上部開口１４Ａを閉塞する。そして、端子箱本体１４への蓋１５の取付けで、パッキン３４の第１片３４Ａを当接面３５の第１当接部３５Ａに圧接して略垂直方向へ撓ませて端子箱本体１４と蓋１５との間をシールすると共に、パッキン３４の第２片３４Ｂを当接面３５の第２当接部３５Ｂに圧接して略水平方向へ撓ませて端子箱本体１４と蓋と１５の間をシールする。このため、取付ねじ２９配置個所から周方向に離間した個所で、第１当接部３５Ａへの第１片３４Ａの圧接において圧接力の反力が蓋１５を略垂直方向の上方へ持ち上げるよう作用し、第１当接部３５Ａへの第１片３４Ａの圧接力が弱まってシール性が低下したとしても、第２片３４Ｂは略水平方向へ撓んで第２当接部３５Ｂに圧接しているから、この圧接力が蓋１５を略垂直方向の上方へ持ち上げる影響を受けて弱まることなくできて良好なシール性を維持でき、端子箱本体１４と蓋１５との間でパッキン３４を異なる２方向に圧接できて端子箱本体１４と蓋１５との間の良好なシールを得ることができる。
【００１７】
また、パッキン３４の第２片３４Ｂを当接面３５の第２当接部３５Ｂに圧接して略水平方向へ撓ませるため、蓋１５には第２当接部３５Ｂへの第２片３４Ｂの圧接において圧接力の反力が略水平方向の内方へ作用し、この反力が第１当接部３５Ａへの第１片３４Ａの圧接で蓋１５を略垂直方向の上方へ持ち上げる抵抗となって持ち上げを抑制でき、端子箱本体１４と蓋１５との間の一層良好なシールを得ることができる。また、当接面３５の第１当接部３５Ａに略垂直方向の上部へ向けて突出する凸部３６を形成しているため、第１当接部３５Ａに圧接するパッキン３４の第１片３４Ａを凸部３６へ圧接させて確実に撓ませることができ、確実なシール性を得ることができる。また、パッキン３４の第２片３４Ｂを略垂直方向の下方へ向けて順次内方に位置する若干の傾斜形状に形成しているため、パッキン３４の第２片３４Ｂを円滑に上部開口１４Ａへ入り込ませることができ、蓋１５を端子箱本体１４へ容易に取付けることができる。また、蓋１５には外周縁から略水平方向へ突出して形成した工具係合部３２Ａ、３２Ｂと端子箱本体１４の上部との間に工具を挿入する挿入間隙３３を形成し、工具係合部３２Ａ、３２Ｂは挿入隙間３３へ挿入した工具と係合可能に設けているため、取付ねじ２９をねじ孔１４Ｂから取外して蓋１５を端子箱本体１４から取外す際に、作業者が工具係合部３２Ａ、３２Ｂに係合した工具を略垂直方向の上方へ持ち上げることで、蓋１５を端子箱本体１４から簡単に取外すことができる。
【００１８】
図７及び図８はパッキン３４を端子箱本体１４に設けた第１実施形態の変形例を示し、第１実施形態と同一個所には同符号を付して説明を省略し、異なる個所についてのみ説明する。
端子箱本体１４には上部開口１４Ａの外周縁に沿ってパッキン３４を装着する環状の凹溝５０を窪み形成すると共に、凹溝５０の略水平方向の内方へ連設して端子箱本体１４の側壁内面５０Ａを略垂直方向の下方へ向けて順次内方に位置する若干の傾斜面に形成している。パッキン３４は第１片３４Ａを凹溝５０に沿って水平方向へ延在すると共に、第２片３４Ｂを側壁内面５０Ａに沿って若干傾斜して略垂直方向へ延在している。蓋１５の裏面にパッキン３４の第１片３４Ａと圧接して略垂直方向へ撓ませる第１当接部５５Ａとパッキン３４の第２片３４Ｂと圧接して略水平方向へ撓ませる第２当接部５５Ｂとを有する当接面５５を形成し、第１当接部５５Ａは上部開口１４Ａの平面形状に沿った水平面であり、第２当接部５５Ｂは第１当接部５５Ａの略水平方向の内方へ連設して略垂直方向の下方へ突出形成した環状の支持部３１の外面を垂直面にして形成する。なお、第２当接部５５Ｂはパッキン３４の第２片３４Ｂが若干傾斜しているため、第２片３４Ｂの略垂直方向の先端側を圧接し、第２片３４Ｂの第１片３４Ａとの連設側との間には略水平方向へ微小な隙間が存在する。第１当接部５５Ａには環状の凸部５６を略垂直方向の下方へ向けて突出形成する。
【００１９】
図９及び図１０は端子箱本体１４に設けたパッキン３４の第２片３４Ｃを垂直状に形成すると共に、蓋１５に形成した当接面５５の第２当接部５５Ｃを若干の傾斜面に形成した第１実施形態の他の変形例を示し、第１実施形態と同一個所には同符号を付して説明を省略し、異なる個所についてのみ説明する。
端子箱本体１４の側壁内面５０Ｂを垂直面に形成し、パッキン３４の第２片３４Ｃを側壁内面５０Ｂに沿って垂直状に延在している。蓋１５に形成した当接面５５の第２当接部５５Ｃは支持部３１の外面を略垂直方向の下方へ向けて順次内方に位置する若干の傾斜面として形成する。第２当接部５５Ｃは第２片３４Ｃの第１片３４Ａとの連設側を圧接し、第２片３４Ｃの略垂直方向の先端側との間には略水平方向へ微小な隙間が存在する。
【００２０】
図１１及び図１２は本発明の第２実施形態を示し、第１実施形態と同一個所には同符号を付して説明を省略し、異なる個所についてのみ説明する。
パッキン６４は略垂直方向へ延在する第２片６４Ｂの上端部に連設して第１片６４Ａを略水平方向へ端子箱外方に向けて延在し、第２片６４Ｂの上端部と対向する下端部に連設して第３片６４Ｃを端子箱内方に向けて延在し、第２片６４Ｂは下端部に向けて順次内方に位置する傾斜状に形成している。パッキン６４の第１片６４Ａには略垂直方向へ膨出する第１膨出部６５Ａを形成すると共に、第２片６４Ｂには略水平方向へ膨出する第２膨出部６５Ｂを形成し、各膨出部６５Ａ、６５Ｂは断面形状を円形に設けている。パッキン６４は第１片６４Ａを蓋１５の凹溝３０に水平方向へ延在し、第２片６４Ｂを凹溝３０に連設する支持部３１の外面３１Ａに沿って延在し、第３片６４Ｃを支持部３１の先端面に水平方向へ延在して蓋１５に装着する。支持部３１は外面３１Ａの略垂直方向の下方を窪ませて第２片６４Ｂに形成した第２膨出部６５Ｂを収装する。端子箱本体１４の当接面６６は上部開口１４Ａの外周縁に水平方向の外方へ連なる水平面の第１当接部６６Ａと、上部開口１４Ａの外周縁に垂直方向の下方へ連なる垂直面の第２当接部６６Ｂとを有し、蓋１５の取付けで第１当接部６６Ａは第１片６４Ａに形成の第１膨出部６５Ａと圧接して略垂直方向へ撓ませると共に、第２当接部６６Ｂは第２片６４Ｂに形成の第２膨出部６５Ｂと圧接して略水平方向へ撓ませる。そして、第２当接部６６Ｂは略垂直方向の上部を上方へ向けて順次外方に位置する若干の傾斜面に形成し、パッキン６４の第２片６４Ｂ、第３片６４Ｃを円滑に上部開口１４Ａへ入り込ませることができるようにしている。
【００２１】
かかる構成において、第１当接部６６Ａへの第１膨出部６５Ａの圧接力が弱まってシール性が低下したとしても、第２膨出部６６Ｂは略水平方向へ撓んで第２当接部６６Ｂに圧接しているから、この圧接力が蓋１５を略垂直方向の上方へ持ち上げる影響を受けて弱まることなくできて良好なシール性を維持でき、第１実施形態と同様に、端子箱本体１４と蓋１５との間でパッキン６４を異なる２方向に圧接できて端子箱本体１４と蓋１５との間の良好なシールを得ることができる。また、蓋１５には第２当接部６６Ｂへの第２膨出部６５Ｂの圧接において圧接力の反力が略水平方向の内方へ作用し、この反力が第１当接部３５Ａへの第１膨出部６５Ａの圧接で蓋１５を略垂直方向の上方へ持ち上げる抵抗となって持ち上げを抑制でき、第１実施形態と同様に、端子箱本体１４と蓋１５との間の一層良好なシールを得ることができる。また、パッキン６４には略垂直方向へ膨出する第１膨出部６５Ａと略水平方向へ膨出する第２膨出部６５Ｂとを形成しているため、第１膨出部６５Ａを第１当接部６６Ａに第２膨出部６５Ｂを第２当接部にそれぞれ圧接させて確実に撓ませることができ、確実なシール性を得ることができる。さらにまた、パッキン６４は第２片６４Ｂの下端部に連設して第３片６４Ｃを端子箱内方に向けて延在しているため、蓋１５の端子箱本体１４への取付けで、パッキン６４の下端部が端子箱本体１４の上部開口１４の外周縁に当たってめくれることを抑制できる。
【００２２】
なお、第１実施形態では、凸部３６を形成したが、必要に応じて形成しなくても良い。また、１個の電磁石６を弁本体１の一側面に設けたものに適用したが、２個の電磁石を弁本体の両側面にそれぞれ設けたものにも適用できることは勿論である。
【００２３】
【発明の効果】
このように請求項１に記載の発明では、端子箱本体と蓋とのいずれか一方には弾力性材料から成形した環状のパッキンを装着すると共に、他方には端子箱本体への蓋の取付けでパッキンと圧接して撓ませる当接面を形成し、パッキンは略水平方向へ延在する第１片と略垂直方向へ延在する第２片とを有し、当接面は端子箱本体への蓋の取付けでパッキンの第１片と圧接して略垂直方向へ撓ませる第１当接部と、パッキンの第２片と圧接して略水平方向へ撓ませる第２当接部とを有しているため、第１当接部への第１片の圧接において圧接力の反力が蓋を略垂直方向の上方へ持ち上げるよう作用し、第１当接部への第１片の圧接力が弱まってシール性が低下したとしても、第２片は略水平方向へ撓んで第２当接部に圧接しているから、この圧接力が蓋を略垂直方向の上方へ持ち上げる影響を受けて弱まることなくできて良好なシール性を維持でき、端子箱本体と蓋との間でパッキンを異なる２方向に圧接できて端子箱本体と蓋との間の良好なシールを得ることができる。また、パッキンの第２片を当接面の第２当接部に圧接して略水平方向へ撓ませるため、蓋には第２当接部への第２片の圧接において圧接力の反力が略水平方向の内方へ作用し、この反力が第１当接部への第１片の圧接で蓋を略垂直方向の上方へ持ち上げる抵抗となって持ち上げを抑制でき、端子箱本体と蓋との間の一層良好なシールを得ることができる。
【００２４】
また、請求項２に記載の発明では、請求項１に記載の発明の効果に加え、当接面の第１当接部に略垂直方向へ突出する凸部を形成しているため、第１当接部に圧接するパッキンの第１片を凸部へ圧接させて確実に撓ませることができ、確実なシール性を得ることができる。
【００２５】
また、請求項３に記載の発明では、請求項１に記載の発明の効果に加え、パッキンの第１片に略垂直方向へ膨出する第１膨出部を形成すると共に、第２片に略水平方向へ膨出する第２膨出部を形成しているため、第１膨出部を当接面の第１当接部に第２膨出部を当接面の第２当接部にそれぞれ圧接させて確実に撓ませることができ、確実なシール性を得ることができる。
【００２６】
また、請求項４に記載の発明では、請求項１ないし３に記載の発明の効果に加え、パッキンは蓋に装着し略垂直方向へ延在する第２片の上端部に連設して第１片を略水平方向へ端子箱外方に向けて延在し、第２片の上端部と対向する下端部に第３片を連設し、第３片は略水平方向へ第１片の延在方向と対向する端子箱内方に向けて延在しているため、蓋の端子箱本体への取付けで、パッキンの下端部が端子箱本体の上部開口の外周縁に当たってめくれることを抑制できる。
【００２７】
また、請求項５に記載の発明では、請求項１ないし４に記載の発明の効果に加え、蓋には外周縁から略水平方向へ突出して工具係合部を形成し、工具係合部と端子箱本体の上部との間に工具を挿入する挿入間隙を形成し、工具係合部は挿入隙間へ挿入した工具と係合可能に設けているため、取付ねじを取外して蓋を端子箱本体から取外す際に、作業者が工具係合部に係合した工具を略垂直方向の上方へ持ち上げることで、蓋を端子箱本体から簡単に取外すことができる。
【図面の簡単な説明】
【図１】本発明の一実施形態を示した電磁弁における端子箱のシール構造の縦断面図である。
【図２】図１の平面図である。
【図３】図２の蓋を取外した図である。
【図４】蓋の裏面を示した図である。
【図５】蓋を取外した状態を示す要部の拡大断面図である。
【図６】蓋を取付けた状態を示す要部の拡大断面図である。
【図７】第１実施形態の変形例を示した図５に相当する図である。
【図８】第１実施形態の変形例を示した図６に相当する図である。
【図９】第１実施形態の他の変形例を示した図５に相当する図である。
【図１０】第１実施形態の他の変形例を示した図６に相当する図である。
【図１１】本発明の第２実施形態を示した図５に相当する図である。
【図１２】第２実施形態を示した図６に相当する図である。
【符号の説明】
１　弁本体
６　電磁石
１３　端子箱
１４　端子箱本体
１５　蓋
１６Ａ、１６Ｂ　電気配線
２９　取付ねじ
３４、６４　パッキン
３４Ａ、６４Ａ　第１片
３４Ｂ、３４Ｃ、６４Ｂ　第２片
３５、５５、６６　当接面
３５Ａ、５５Ａ、６６Ａ　第１当接部
３５Ｂ、５５Ｂ、５５Ｃ、６６Ｂ　第２当接部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electromagnetic valve provided with a packing which closes an opening of a terminal box main body for electrically connecting an electromagnet of an electromagnetic valve and an electric wiring from an external power supply inside with a lid, and seals between the terminal box main body and the lid. The present invention relates to a terminal box seal structure.
[0002]
[Prior art]
The sealing structure of the terminal box in the conventional solenoid valve is such that the terminal box is composed of a terminal box body and a lid. The terminal is electrically connected, and the lid is attached to the upper portion of the terminal box body by tightening four mounting screws arranged at four locations in the circumferential direction so as to close the upper opening of the terminal box body. A groove is provided around the lid, and a ring-shaped packing with a rectangular cross section is attached to this groove. The terminal box body has an inclined contact surface that makes contact with the ridge of the packing and bends. When the lid is attached to the terminal box body, the packing is pressed against the contact surface to seal between the terminal box body and the lid. (See, for example, Japanese Utility Model Publication No. 64-5902).
[0003]
[Problems to be solved by the invention]
However, in the conventional seal structure of the terminal box in the solenoid valve, when the packing is pressed against the contact surface, the reaction force of the pressing force acts to lift the lid substantially vertically upward against the tightening of the mounting screw. In particular, at locations that are circumferentially separated from the mounting screw locations, the pressure of the packing against the abutment surface is weakened, resulting in poor sealing and good sealing between the terminal box body and the lid. It was hard to be.
[0004]
An object of the present invention is to provide a sealing structure for a terminal box in a solenoid valve in which a packing is pressed between a terminal box main body and a lid in two different directions to obtain a good seal between the terminal box main body and the lid. And
[0005]
[Means for Solving the Problems]
For this reason, in the present invention, the terminal box has a seal structure for the solenoid valve provided at the upper part of the valve body of the solenoid valve, and the terminal box is opened at an upper part to electrically connect the electromagnet and the electric wiring from the external power supply inside. A terminal box body to be connected, and a lid to be attached to an upper portion of the terminal box body by tightening a plurality of mounting screws downward in a substantially vertical direction so as to close an upper opening of the terminal box body. An annular packing molded from a resilient material is attached to one of them, and the other is formed with an abutting surface that is pressed against the packing and bent when the lid is attached to the terminal box body. It has a first piece extending in the horizontal direction and a second piece extending in the substantially vertical direction, and the contact surface is pressed against the first piece of the packing when the lid is attached to the terminal box main body, and is substantially in the vertical direction. Press contact with the first contact part to bend to the second piece of packing Comprising a second abutment portion to deflect in the horizontal direction. In this case, a projection projecting in a substantially vertical direction may be formed on the first contact portion of the contact surface. Further, the first piece of the packing may be formed with a first bulged portion that swells in a substantially vertical direction, and the second piece may be formed with a second bulged portion that swells in a substantially horizontal direction. Furthermore, the packing is attached to the lid, is connected to the upper end of the second piece extending substantially vertically, and extends the first piece substantially horizontally toward the outside of the terminal box. A third piece may be continuously provided at a lower end portion facing the upper end portion, and the third piece may extend substantially horizontally toward the inside of the terminal box opposite to the extending direction of the first piece. Furthermore, the lid protrudes in a substantially horizontal direction from the outer peripheral edge to form a tool engagement portion, and an insertion gap for inserting a tool is formed between the tool engagement portion and an upper portion of the terminal box main body. The portion may be provided so as to be able to engage with a tool inserted into the insertion gap.
[0006]
According to the present invention, by tightening a plurality of mounting screws downward in a substantially vertical direction and mounting the lid on the upper portion of the terminal box main body to close the upper opening of the terminal box main body, and attaching the lid to the terminal box main body, The first piece of the packing is pressed against the first contact portion of the contact surface to bend in a substantially vertical direction to seal between the terminal box body and the lid, and the second piece of the packing is attached to the first contact portion of the contact surface. (2) The terminal box body and the lid are sealed by being pressed against the contact portion and bent in a substantially horizontal direction. For this reason, the reaction force of the press-contact force acts to lift the lid substantially vertically upward in the press-contact of the first piece to the first contact portion at a location circumferentially separated from the mounting screw disposition location, Even if the pressure contact force of the first piece to the first contact portion is weakened and the sealing performance is reduced, the second piece is bent substantially in the horizontal direction and presses against the second contact portion. Can be maintained without being weakened by the effect of lifting the terminal box substantially vertically upward, and the packing can be pressed against the terminal box body and the lid in two different directions between the terminal box body and the lid. A good seal between them can be obtained.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
1 to 3, reference numeral 1 denotes a valve body of an electromagnetic valve, which has a substantially rectangular parallelepiped shape, and has a through hole 3 through which a spool-shaped valve body 2 is slidably inserted in an axial direction. Female threads are threaded at both ends of the fitting holes 3 opening on both sides of the valve body 1. A supply channel P for supplying a pressure fluid is opened at a substantially central portion in the axial direction of the fitting hole 3, and a fluid actuator (not shown) is provided with gaps on both sides in the axial direction of a connection point of the supply channel P. 2), two discharge passages A1 and B are opened, and discharge passages R1 and R2 each having a gap on the outside in the axial direction of both load passages A and B and communicating with the low pressure side are respectively formed. It is open. In the original position shown in the upper half of FIG. 1, the valve body 2 switches and connects the supply flow path P to the load flow path A, and also switches and connects the load flow path B to the discharge flow path R2. At the position, land portions 2A and 2B are provided so as to switch the supply flow path P to the load flow path B and to switch the load flow path A to the discharge flow path R1.
[0008]
Reference numeral 4 denotes a plug member which is screwed into one internal thread of the fitting hole 3, and closes the opening of the fitting hole 3 on one side of the valve body 1. Reference numeral 5 denotes a spring housed inside the plug member 4, which biases the valve body 2 toward the original position. Reference numeral 6 denotes an electromagnet. The fixed iron core 7 is screwed into the other female thread of the fitting hole 3 and mounted on the other side of the valve body 1, and the movable iron core 9 is fixed by an attractive force generated by energizing the coil 8. The attraction to the iron core 7 causes the valve body 2 to switch from the original position to the switching position against the force of the spring 5 via the pin 10 by the attraction. The electromagnet 6 includes two connection pins 11 electrically connected to the coil 8, and the connection pins 11 are provided so as to protrude substantially in the horizontal direction.
[0009]
Reference numeral 13 denotes a terminal box provided on the upper part of the valve body 1 of the solenoid valve, and comprises a terminal box body 14 and a lid 15. The terminal box main body 14 has a substantially box shape with an open top, and is attached to the valve main body 1 by two mounting screws 16 arranged diagonally in a plane, and electrical wirings 16A and 16B from an external power supply are provided on opposite side walls. The introduction holes 17A and 17B to be introduced are respectively formed with openings, one of the introduction holes 17A is closed with a plug member 18 which is detachably screwed, and the other is electrically connected by a seal connector member 19 which is detachably screwed into the other introduction hole 17B. The wirings 16A and 16B are sealed and introduced inside. It is also possible to close the other introduction hole 17B with the plug member 18 and screw the seal connector member 19 into the one introduction hole 17A to introduce the electric wirings 16A and 16B.
[0010]
A terminal block 20 and a printed circuit board 21 are accommodated and arranged inside the terminal box main body 14, and terminal fittings 23A, 23B for fixing the electric wirings 16A, 16B to the terminal block 20 by terminal screws 22A, 22B. An indicator lamp 24 such as a neon lamp or a light-emitting diode that is turned on when energized is provided. The terminal fittings 23A and 23B and the indicator lamp 24 are electrically connected to the printed circuit board 21, respectively. The printed circuit board 21 includes various circuit elements 25 such as a resistor, a capacitor, and a surge killer, and two connection fittings 26 that are electrically connected to the connection pins 11 of the electromagnet 6. The electrical connection between the connection pins 11 and the connection fittings 26 is as follows. When the electromagnet 6 is mounted on the other side of the valve main body 1, the connection pin 11 can be inserted through the insertion hole 27 formed below the side wall of the terminal box main body 14, and the distal end can be fitted to the connection fitting 26. Then, the printed circuit board 21 electrically connects the terminal fittings 23A and 23B, the indicator lamp 24, the circuit element 25, and the connection fitting 26 by printed wiring to enable electricity to flow from the electrical wirings 16A and 16B to the electromagnet 6. The indicator lamp 24 is turned on when energized. Reference numeral 28 denotes a screw for fixing the terminal block 20 to the terminal box body 14.
[0011]
The lid 15 is formed from a transparent resin material, and four mounting screws 29 arranged at four corners are screwed into the screw holes 14B of the terminal box body 14 and tightened substantially downward in the terminal box. A display unit 15A is formed on the main body 14 so as to close the upper opening 14A of the terminal box main body 14 so that the lighting of the indicator lamp 24 can be visually recognized from the outside. As shown in FIG. 4, an annular concave groove 30 is formed in the back surface of the lid 15 along the plane shape of the upper opening 14A, and the annular groove 30 is provided substantially inward in the substantially horizontal direction to form an annular support. The portion 31 is formed to protrude substantially vertically downward. As shown in FIGS. 5 and 6, the support portion 31 has an outer surface 31A connected to the concave groove 30 formed on a slightly inclined surface sequentially located inward downward. Reference numerals 32A and 32B denote tool engaging portions formed at two opposing outer peripheral edges of the lid 15 so as to protrude in a substantially horizontal direction. As shown in FIG. An insertion gap 33 for inserting a tool such as a screwdriver (not shown) is formed between the terminal box body 14 and the upper part of the terminal box 14. To facilitate.
[0012]
Reference numeral 34 denotes an annular packing formed of an elastic material such as NBR, which is mounted in the concave groove 30 of the lid 15. As shown in FIGS. 5 and 6, the packing 34 is provided with a first piece 34 A extending in the horizontal direction along the concave groove 30, and is connected to the horizontal inner end of the first piece 34 A to form the support portion 31. And a second piece 34B slightly inclined along the outer surface 31A and extending in a substantially vertical direction. The terminal box body 14 is provided with a contact surface 35 for pressing and bending the packing 34 by attaching the lid 15, and the contact surface 35 is pressed against the first piece 34 A of the packing 34 to bend in a substantially vertical direction. It has a first contact portion 35A and a second contact portion 35B which presses against the second piece 34B of the packing 34 and bends in a substantially horizontal direction, and the first contact portion 35A is horizontally formed on the outer peripheral edge of the upper opening 14A. The second contact portion 35B is a vertical surface that extends vertically downward to the outer peripheral edge of the upper opening 14A. In addition, since the second piece 34B of the packing 34 is slightly inclined, the second contact portion 35B presses the side of the second piece 34B that is continuous with the first piece 34A, and the second piece 34B is substantially perpendicular to the second piece 34B. There is a small gap in the substantially horizontal direction between the front end and the front end. Reference numeral 36 denotes a convex portion having a semicircular cross-section and projecting upward in a substantially vertical direction, and is formed in an annular shape along the vicinity of the outer peripheral edge of the upper opening 14A in the first contact portion 35A of the contact surface 35. .
[0013]
Next, the operation of this configuration will be described.
The upper half of the valve body 2 in FIG. 1 shows a state in which the electromagnet 6 is not energized. The valve body 2 is held in its original position by the force of the spring 5, and switches the supply flow path P to the load flow path A and simultaneously loads the load flow path A. The passage B is in switching communication with the discharge passage R2.
[0014]
In this state, when the coil 8 of the electromagnet 6 is energized from the electric wires 16A and 16B of the external power supply, the movable iron core 9 is attracted to the fixed iron core 7 by the attraction force generated by the energization, and the valve body 2 is It operates to the switching position shown in the lower half of FIG. 1 against the five forces to switch the supply flow path P to the load flow path B and to switch the load flow path A to the discharge flow path R1. At this time, the indicator lamp 24 is turned on by energizing the coil 8, and this lighting can be visually recognized on the display unit 15A from outside.
[0015]
When the electromagnet 6 is de-energized, the valve body 2 is returned to the original position shown in the upper half of FIG. 1 by the force of the spring 5, and the indicator light 24 is turned off.
[0016]
With this operation, the electric wires 16A, 16B are connected to the terminal screws 22A, 22B by using a tool such as a screwdriver through the upper opening 14A of the terminal box main body 14 with the lid 15 removed from the terminal box main body 14. The electric wires 16A, 16B are fastened to the metal fittings 23A, 23B by fastening to the metal fittings 23A, 23B, and then four mounting screws 29 are screwed into the screw holes 14B and tightened substantially downward in the vertical direction. The lid 15 is attached to the terminal box body 14 to close the upper opening 14A of the terminal box body 14. When the lid 15 is attached to the terminal box main body 14, the first piece 34A of the packing 34 is pressed against the first contact portion 35A of the contact surface 35 to bend in a substantially vertical direction. 15 and the second piece 34B of the packing 34 is pressed against the second contact portion 35B of the contact surface 35 to bend in a substantially horizontal direction, so that the space between the terminal box main body 14 and the lid 15 is formed. Seal. For this reason, the reaction force of the press-contact force in the press-contact of the first piece 34A to the first contact portion 35A at a location circumferentially separated from the mounting screw 29 arrangement location acts to lift the lid 15 substantially vertically upward. However, even if the pressing force of the first piece 34A against the first contact portion 35A is weakened and the sealing performance is reduced, the second piece 34B is bent in a substantially horizontal direction and is pressed against the second contact portion 35B. Therefore, this pressure contact force is not weakened due to the effect of lifting the lid 15 substantially vertically upward, so that good sealing performance can be maintained, and the packing 34 can be moved between the terminal box body 14 and the lid 15 in two different directions. And a good seal between the terminal box body 14 and the lid 15 can be obtained.
[0017]
Further, since the second piece 34B of the packing 34 is pressed against the second contact portion 35B of the contact surface 35 to bend in a substantially horizontal direction, the lid 15 is provided with the second piece 34B to the second contact portion 35B. In the pressure contact, a reaction force of the pressure contact force acts substantially inward in the horizontal direction, and the reaction force becomes a resistance that lifts the lid 15 substantially vertically upward by the pressure contact of the first piece 34A to the first contact portion 35A. Lifting can be suppressed, and a better seal between the terminal box main body 14 and the lid 15 can be obtained. Further, since the first contact portion 35A of the contact surface 35 is formed with the convex portion 36 protruding upward in the substantially vertical direction, the first piece 34A of the packing 34 pressed against the first contact portion 35A is formed. Can be reliably bent by being pressed against the convex portion 36, and a reliable sealing property can be obtained. In addition, since the second piece 34B of the packing 34 is formed in a slightly inclined shape that is sequentially located inward downward in the substantially vertical direction, the second piece 34B of the packing 34 smoothly enters the upper opening 14A. The cover 15 can be easily attached to the terminal box main body 14. Further, an insertion gap 33 for inserting a tool is formed between the tool engaging portions 32A and 32B formed in the lid 15 so as to protrude in a substantially horizontal direction from the outer peripheral edge and the upper portion of the terminal box main body 14, and the tool engaging portion is formed. Since 32A and 32B are provided so as to be able to engage with the tool inserted into the insertion gap 33, when the mounting screw 29 is removed from the screw hole 14B and the lid 15 is removed from the terminal box main body 14, the operator engages with the tool engaging portion. The lid 15 can be easily removed from the terminal box body 14 by lifting the tool engaged with 32A, 32B upward in a substantially vertical direction.
[0018]
7 and 8 show a modified example of the first embodiment in which the packing 34 is provided on the terminal box main body 14. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described. explain.
The terminal box main body 14 is formed with an annular concave groove 50 for mounting the packing 34 along the outer peripheral edge of the upper opening 14 A, and is provided substantially inward in the substantially horizontal direction of the concave groove 50. Side wall inner surface 50A is formed on a slightly inclined surface which is sequentially located inward toward a substantially vertical downward direction. The packing 34 extends the first piece 34A in the horizontal direction along the groove 50, and extends the second piece 34B in the substantially vertical direction with a slight inclination along the side wall inner surface 50A. A first contact portion 55A, which comes into pressure contact with the first piece 34A of the packing 34 on the back surface of the lid 15 to bend substantially in the vertical direction, and a second contact, which comes into pressure contact with the second piece 34B of the packing 34 and is bent in the substantially horizontal direction. The first contact portion 55A is a horizontal surface along the plane shape of the upper opening 14A, and the second contact portion 55B is substantially horizontal with respect to the first contact portion 55A. The outer surface of the annular support portion 31 which is continuously formed inward and protrudes downward in a substantially vertical direction is formed as a vertical surface. In addition, since the second piece 34B of the packing 34 is slightly inclined, the second contact portion 55B presses the substantially vertical tip side of the second piece 34B to contact the first piece 34A of the second piece 34B. There is a minute gap in the substantially horizontal direction between the connecting side and the connecting side. An annular convex portion 56 is formed on the first contact portion 55A so as to protrude downward in a substantially vertical direction.
[0019]
9 and 10 show that the second piece 34C of the packing 34 provided on the terminal box main body 14 is formed vertically and the second contact portion 55C of the contact surface 55 formed on the lid 15 is slightly inclined. Another modified example of the first embodiment is shown, in which the same parts as in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described.
The side wall inner surface 50B of the terminal box main body 14 is formed as a vertical surface, and the second piece 34C of the packing 34 extends vertically along the side wall inner surface 50B. The second abutment portion 55C of the abutment surface 55 formed on the lid 15 is formed as a slightly inclined surface that is located inward in the outer surface of the support portion 31 sequentially downward in a substantially vertical direction. The second contact portion 55C presses the side of the second piece 34C that is continuous with the first piece 34A, and there is a small gap in the substantially horizontal direction between the second piece 34C and the substantially vertical end of the second piece 34C. I do.
[0020]
11 and 12 show a second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described.
The packing 64 is connected to the upper end of the second piece 64B extending substantially vertically, extends the first piece 64A substantially horizontally toward the outside of the terminal box, and is connected to the upper end of the second piece 64B. The third piece 64C extends inwardly of the terminal box so as to be continuously provided at the opposed lower end, and the second piece 64B is formed in an inclined shape that is sequentially located inward toward the lower end. The first piece 64A of the packing 64 has a first bulging portion 65A bulging in a substantially vertical direction, and the second piece 64B has a second bulging portion 65B bulging in a substantially horizontal direction. Each of the bulging portions 65A and 65B has a circular cross section. The packing 64 extends the first piece 64A in the groove 30 of the lid 15 in the horizontal direction, extends the second piece 64B along the outer surface 31A of the support portion 31 connected to the groove 30, and forms the third piece 64A. 64C extends in the horizontal direction on the distal end surface of the support portion 31 and is attached to the lid 15. The support portion 31 accommodates the second bulging portion 65B formed in the second piece 64B by recessing the lower portion of the outer surface 31A in a substantially vertical direction. The contact surface 66 of the terminal box main body 14 has a first contact portion 66A in a horizontal plane that extends horizontally outward to the outer peripheral edge of the upper opening 14A and a vertical surface that extends vertically downward to the outer peripheral edge of the upper opening 14A. A second contact portion 66B is provided, and the first contact portion 66A is brought into pressure contact with a first bulging portion 65A formed on the first piece 64A by attaching the lid 15 to bend in a substantially vertical direction. The contact portion 66B presses against the second bulging portion 65B formed on the second piece 64B to bend in a substantially horizontal direction. The second abutment portion 66B is formed on a slightly inclined surface that is located outward in order with the upper portion in the substantially vertical direction facing upward, and the second piece 64B and the third piece 64C of the packing 64 are smoothly opened to the upper part. 14A.
[0021]
In such a configuration, even if the pressing force of the first bulging portion 65A against the first abutting portion 66A is weakened and the sealing performance is reduced, the second bulging portion 66B bends in a substantially horizontal direction and the second abutting portion is bent. 66B, it is possible to maintain a good sealing property without being weakened by the effect of lifting the lid 15 substantially vertically upward, as in the first embodiment, as in the first embodiment. The packing 64 can be pressed between the terminal box 14 and the lid 15 in two different directions, and a good seal between the terminal box body 14 and the lid 15 can be obtained. Further, when the second bulging portion 65B is pressed against the second contact portion 66B on the lid 15, a reaction force of the pressing force acts substantially inward in the horizontal direction, and this reaction force is applied to the first contact portion 35A. The pressure of the first bulging portion 65A causes the lid 15 to be lifted in a substantially vertical direction, thereby preventing the lid 15 from being lifted up. As in the first embodiment, the lid 15 is further improved between the terminal box body 14 and the lid 15. A good seal can be obtained. In addition, since the packing 64 is formed with the first bulging portion 65A bulging in the substantially vertical direction and the second bulging portion 65B bulging in the substantially horizontal direction, the first bulging portion 65A is formed by the first bulging portion 65A. The second bulging portion 65B is brought into pressure contact with the contact portion 66A and pressed against the second contact portion, whereby the second bulging portion 65B can be reliably bent, and a reliable sealing property can be obtained. Furthermore, since the packing 64 is connected to the lower end of the second piece 64B and extends the third piece 64C toward the inside of the terminal box, when the lid 15 is attached to the terminal box body 14, the packing 64 It can be suppressed that the lower end of the bump 64 hits the outer peripheral edge of the upper opening 14 of the terminal box main body 14 and is turned up.
[0022]
In the first embodiment, the convex portion 36 is formed, but may not be formed if necessary. Further, although one electromagnet 6 is applied to one provided on one side surface of the valve main body 1, it is needless to say that the present invention can also be applied to one provided with two electromagnets on both side surfaces of the valve main body.
[0023]
【The invention's effect】
As described above, according to the first aspect of the present invention, one of the terminal box body and the lid is provided with an annular packing formed of an elastic material, and the other is provided with the cover attached to the terminal box body. A contact surface is formed to press and bend with the packing, and the packing has a first piece extending substantially in the horizontal direction and a second piece extending substantially in the vertical direction, and the contact surface is connected to the terminal box body. A first abutting portion that presses against the first piece of the packing and flexes substantially in the vertical direction when the lid is attached, and a second abutment portion that presses against the second piece of the packing and flexes in the substantially horizontal direction. Therefore, when the first piece is pressed against the first contact portion, the reaction force of the pressing force acts to lift the lid substantially vertically upward, and the pressing force of the first piece against the first contact portion. Is weakened and the sealing performance is reduced, the second piece bends in a substantially horizontal direction and presses against the second contact portion. Can be maintained without being weakened by the effect of lifting the lid upward substantially in the vertical direction, and can maintain good sealing properties, and can press the packing between the terminal box main body and the lid in two different directions so that the terminal box main body and the lid can be pressed. And a good seal can be obtained. In addition, since the second piece of the packing is pressed against the second contact portion of the contact surface to bend in a substantially horizontal direction, the lid has a reaction force against the pressure contact force when the second piece is pressed against the second contact portion. Acts substantially inward in the horizontal direction, and this reaction force acts as a resistance to lift the lid substantially vertically upward by pressing the first piece against the first contact portion, thereby suppressing the lifting. A better seal with the lid can be obtained.
[0024]
According to the second aspect of the invention, in addition to the effects of the first aspect, the first contact portion of the contact surface is formed with a convex portion projecting in a substantially vertical direction. The first piece of the packing, which is in pressure contact with the contact portion, can be pressed against the convex portion to be flexed reliably, so that reliable sealing performance can be obtained.
[0025]
According to the third aspect of the invention, in addition to the effects of the first aspect, the first piece of the packing is formed with a first bulging portion that bulges in a substantially vertical direction, and the second piece is formed with the second piece. Since the second bulging portion bulging in the substantially horizontal direction is formed, the first bulging portion is connected to the first abutting portion of the abutting surface, and the second bulging portion is provided to the second abutting portion of the abutting surface. Can be reliably bent by being pressed against each other, and a reliable sealing property can be obtained.
[0026]
According to the fourth aspect of the present invention, in addition to the effects of the first to third aspects, the packing is attached to the lid and connected to the upper end of the second piece extending substantially in the vertical direction. One piece extends in a substantially horizontal direction toward the outside of the terminal box, and a third piece is continuously provided at a lower end portion facing the upper end portion of the second piece. Since the terminal extends toward the inside of the terminal box facing the extending direction, it is possible to prevent the lower end of the packing from hitting the outer peripheral edge of the upper opening of the terminal box main body when the lid is attached to the terminal box main body. .
[0027]
According to the fifth aspect of the present invention, in addition to the effects of the first to fourth aspects of the present invention, a tool engaging portion is formed on the lid so as to protrude from the outer peripheral edge substantially in the horizontal direction, and the tool engaging portion is formed. An insertion gap for inserting a tool is formed between the upper part of the terminal box main body and the tool engaging portion is provided so as to be able to engage with the tool inserted into the insertion gap. When the operator removes the lid from the terminal box main body, the operator lifts the tool engaged with the tool engagement portion substantially vertically upward.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a sealing structure of a terminal box in a solenoid valve according to an embodiment of the present invention.
FIG. 2 is a plan view of FIG.
FIG. 3 is a view in which a lid of FIG. 2 is removed.
FIG. 4 is a diagram showing a back surface of a lid.
FIG. 5 is an enlarged sectional view of a main part showing a state where a lid is removed.
FIG. 6 is an enlarged sectional view of a main part showing a state where a lid is attached.
FIG. 7 is a diagram corresponding to FIG. 5 showing a modification of the first embodiment.
FIG. 8 is a diagram corresponding to FIG. 6 showing a modification of the first embodiment.
FIG. 9 is a view corresponding to FIG. 5, showing another modification of the first embodiment.
FIG. 10 is a view corresponding to FIG. 6, showing another modification of the first embodiment.
FIG. 11 is a view corresponding to FIG. 5 showing a second embodiment of the present invention.
FIG. 12 is a diagram corresponding to FIG. 6 showing a second embodiment.
[Explanation of symbols]
1 Valve body 6 Electromagnet 13 Terminal box 14 Terminal box body 15 Lids 16A, 16B Electrical wiring 29 Mounting screws 34, 64 Packing 34A, 64A First piece 34B, 34C, 64B Second piece 35, 55, 66 Contact surface 35A, 55A, 66A First contact portion 35B, 55B, 55C, 66B Second contact portion

Claims

A terminal box sealing structure of a terminal box in a solenoid valve provided on an upper portion of a valve body of the solenoid valve, wherein the terminal box is opened at an upper portion to electrically connect an electromagnet and an electric wiring from an external power supply inside, A lid attached to the upper part of the terminal box body by tightening a plurality of mounting screws substantially vertically downward so as to close the upper opening of the terminal box body, and one of the terminal box body and the lid is provided. An annular packing molded from an elastic material is mounted, and the other side has a contact surface which is pressed against the packing and bent when the lid is attached to the terminal box main body, and the packing extends in a substantially horizontal direction. A first piece having a first piece and a second piece extending in a substantially vertical direction, wherein the contact surface is pressed against the first piece of the packing when the lid is attached to the terminal box body and is bent substantially in the vertical direction; The second part of the packing presses against the second piece of the packing and flexes in a substantially horizontal direction. Sealing structure of the terminal box in the electromagnetic valve, characterized in that it comprises a contact portion.

2. The sealing structure for a terminal box in a solenoid valve according to claim 1, wherein a convex portion protruding in a substantially vertical direction is formed on the first contact portion of the contact surface.

2. A packing according to claim 1, wherein a first bulge is formed on the first piece of the packing in a substantially vertical direction, and a second bulge is formed on the second piece in a substantially horizontal direction. 3. The seal structure of the terminal box in the solenoid valve according to 1.

The packing is attached to the lid, is connected to the upper end of the second piece extending substantially vertically, extends the first piece substantially horizontally toward the outside of the terminal box, and is connected to the upper end of the second piece. The third piece is continuously provided at the opposed lower end, and the third piece extends substantially horizontally toward the inside of the terminal box facing the extending direction of the first piece. 4. A seal structure for a terminal box in the solenoid valve according to 3.

The lid protrudes from the outer peripheral edge in a substantially horizontal direction to form a tool engagement portion, and an insertion gap for inserting a tool is formed between the tool engagement portion and an upper portion of the terminal box main body, and the tool engagement portion is inserted. The sealing structure for a terminal box in a solenoid valve according to any one of claims 1 to 4, wherein the sealing member is provided so as to be able to engage with a tool inserted into the gap.