JP4194017B2

JP4194017B2 - Fluid pipe detachment prevention device

Info

Publication number: JP4194017B2
Application number: JP2002139199A
Authority: JP
Inventors: 孝夫橋本
Original assignee: Cosmo Koki Co Ltd
Current assignee: Cosmo Koki Co Ltd
Priority date: 2002-05-14
Filing date: 2002-05-14
Publication date: 2008-12-10
Anticipated expiration: 2022-05-14
Also published as: JP2003329180A

Description

【０００１】
【発明の属する技術分野】
本発明は、水道管、ガス管、プラント用配管などの流体管の受入口端部に挿入口端部を挿入し、シール部材を介して前記両流体管を水密に接続する流体管の離脱防止装置に関する。
【０００２】
【従来の技術】
この種の流体管の離脱防止装置としては、例えば特公平３−５５７１６号公報により知られている。
【０００３】
この流体管の離脱防止装置は、図５及び図６に示されており、図５は流体管の受入口端部と挿入口端部を接合した従来の離脱防止装置を示す断面図であり、図６は図５のＣ−Ｃ断面図である。
【０００４】
図５に示す離脱防止装置０５は、一方の流体管の受入口端部内部に他方の流体管の挿入口端部０２を挿入し、図示しないシール部材（例えばパッキン）を介して水密に接続している。
【０００５】
離脱防止装置０５の前面には、庇部が０６突設形成されており、この庇部０６に穿設されるねじ孔（不図示）には固定ボルトが螺入されて、受入口端部の図示しない顎に係合して離脱防止装置０５を固定している。
【０００６】
離脱防止装置０５の内周面には、複数の内周溝０１０が隔壁０１１をもって円周方向に区画形成されるとともに、その外周面の複数箇所に穿設されたねじ孔０１３は、離脱防止装置０５の各内周溝０１０に連通して管軸中心方向を向くように形成されており、これらねじ孔０１３に押しボルト０１７を螺入し、円周方向外周から押しボルト０１７の先端で後述する係止片０１５を外方から管軸中心方向に向けて押圧するように構成されている。
【０００７】
そして、離脱防止装置０５の内周溝０１０内には、円弧状の係止片０１５がそれぞれ傾斜状態で収容されており、この係止片０１５は、実質的には皿ばね状断面を有し、全体的に弾性に富む特性を有した外周面０１５ａは円弧状に、内方面は食い込み刃０１５ｂが形成されるとともに、前面０１５ｃ並びに後面０１５ｄはそれぞれ平行に形成されており、係止片０１５の両側端には、隔壁との間に硬質ゴム体よりなる支持部材０１６が介装されて係止片０１５を内周溝０１０内に保持している。
【０００８】
そこで、各係止片０１５は、図６に示すように、その外周を押しボルト０１７により押圧することで、挿入口端部０２の外周に食い込み刃０１５ｂが食い込み状に係合する。従って、相互に接続された流体管の挿入口端部０２が図示しない受入口端部から離れる方向ａに変位するとき、係止片０１５はその外周面０１５ａ及び後面０１５ｄが押しボルト０１７及び内周溝０１０に拘束されているので、外周面０１５ａとボルト０１７との接点を中心とする皿ばね作用により、捻れ方向（ｂ方向）に揺動することで、その先端の食い込み刃０１５ｂは、挿入口端部０２の外周面の円周方向に均等に、且つ更に深く食い込むことになる。そして、係止片０１５は、ｂ方向の揺動により係止片０１５の後面０１５ｄが内周溝に衝接したところで、揺動作用は停止し挿入口端部０２の離脱が阻止される。
【０００９】
【発明が解決しようとする課題】
ところが、上述した従来の離脱防止装置０５は、挿入口端部０２の外周面に、円弧状の係止片０１５の両端が円周方向に所定距離離間して断続的に配置され、係止片間には支持部材０１６が介在しているため、挿入口端部０２外周面に作用する食い込み刃０１５ｂの作用範囲が少なく、管の離脱力に対する係止片０１５の食い込み力が過大となることが避けられなかった。
【００１０】
従って、挿入口端部０２が受入口端部から離れる方向ａに変位したとき、係止片０１５の押圧力によって食い込み刃０１５ｂの変位方向とは反対側の部分０１８が盛り上がることでこの部位に塗布された防錆剤が剥離したり、或いは管内面に張り付けられている内層ライニングがはげ落ちるといった問題を有していた。
【００１１】
本発明は、上記問題点を解決するためになされたもので、各係止爪に過大な食い込み力が作用することなく、相互の流体管を水密状態で確実に接続することができる流体管の離脱防止装置を提供することを目的をしている。
【００１２】
【課題を解決するための手段】
上記目的を達成するために、本発明の流体管の離脱防止装置は、一方の流体管の受入口端部に他方の流体管の挿入口端部を挿入し、前記両流体管を水密に接続する流体管の離脱防止装置において、
前記挿入口端部に嵌挿される環状ホルダの内周面、または受入口端部の内周面に形成された環状溝内に、該環状溝の深さより浅く形成された中心を向く複数の隔壁によって画成された複数の収容部屋と、
前記隔壁によって周方向に移動拘束されて前記各収容部屋に配置されると共に、前記周方向の両端部に中心へ向けて開口する先細溝が形成され、内周端縁に係止爪を有する係止片と、
前記係止片の先細溝と前記隔壁を含む収容部屋の内壁とで形成される空間に圧入して前記係止片の両端部側を弾力的に押圧保持する弾性片と、を備え、
前記各係止片は前記挿入口端部の外周面と前記隔壁先端の間に形成される空間部内に位置される延設された両端を有し、前記空間部内で互いに隣接する前記係止片の両端を近接させて配置すると共に、前記係止片は外方からの押圧力によりその内周端縁の係止爪で前記隔壁先端の空間部を含む挿入口端部外周を押圧係止することを特徴としている。
この特徴によれば、互いに隣接する係止爪の間隔が円周方向で最小隙間となるように収容配置して、係止爪単位の流体管外周に対する接触長さが拡大することで、相互の流体管に離脱方向の変位が生じても各係止爪に過大な食い込み力を生起させることなく、前記流体管の挿入端部外周を水密状態で確実に接続することができる。
【００１３】
また、弾性片を先細溝内に圧入することによって収容部屋内に収容された係止片を確実に保持することができる。
【００１４】
【発明の実施の形態】
以下、本発明の実施形態を図面に基づいて説明する。
【００１５】
図１は、本発明の一実施形態に係り、相互の流体管を水密に接続する離脱防止装置の断面図、図２は図１のＡ−Ａ断面図であって（ａ）は管相互に軸方向の変位が生ずる前の状態を示し、（ｂ）は管相互に軸方向の変位が生じた状態を示す部分断面図、図３は環状ホルダ内に収容された係止爪の作用説明図であり、図４は図３のＢ−Ｂ断面図である。
【００１６】
図１、図２に示す符号１、２は、互いに接続される流体管の受入口端部及び挿入口端部であり、受入口端部１は外側端部にフランジ１ａを有し、該フランジ１ａには円周方向に等間隔にボルト挿通孔１ｂが形成されており、開口端縁の内周に形成されるパッキン収容凹部１ｃには挿入口端部２外周面を水密にシールするパッキン３が嵌入されている。
【００１７】
４は、挿入口端部２に嵌挿される離脱防止装置としての環状ホルダであって、この環状ホルダ４には、受入口端部１のボルト挿通孔１ｂに対応してボルト挿通孔４ａが形成されている。４ｂは環状ホルダ４の前面から突出して形成されるパッキン３を押圧する環状の突出部である。
【００１８】
図３に示すように、環状ホルダ４の内周面に形成される環状溝内には、この環状溝の深さより浅く形成された中心を向く複数の隔壁５ａ、５ｂ…（本実施形態では６つ）が円周方向に配設され、これら隔壁５ａ、５ｂ…によって複数の収容部屋５が画成されている。したがって、収容部屋５は各隔壁５ａ、５ｂ…の先端空間部を介してリング状に連接している。
【００１９】
８は環状ホルダ４の円周方向に複数箇所に亘って穿設されたねじ孔であり、このねじ孔８は、環状ホルダ４の収容部屋５の円周方向の略中央に連通して管軸中心方向に穿設されている。
【００２０】
環状ホルダ４の各収容部屋５には、図１及び図２に示すように、内周端縁に鋭角に突設する断面山形の係止爪６ａを備えた円弧状の係止片６が収容されており、これら係止片６は、ダクタイル鋳鉄、スチール製の金属製のものが採用されている。
【００２１】
係止片６は、断面が方形で係止爪６ａの両端は、図３に示すように、両側の隔壁５ａ、５ｂの先端空間部に臨むように円周方向に延設されて、各係止片６の爪間隔Ｌは限りなく近接している。そして係止片６の両端部には中心に向けて開口する先細溝６ｂが形成されている。
【００２２】
１５は弾性片であって、この弾性片１５は、例えばゴム製の素材で先細の砲弾形であって片側の角度がθとなるテーパ状に形成され、係止片６両端に形成される先細溝６ｂ、６ｂと隔壁５ａ，５ｂの内壁ないし収容部屋５の内壁とで形成される空間に内方開口側から弾性片１５を圧入することで、係止片６の両側が弾力的に押圧保持されるようになっている。
【００２３】
すなわち、この弾性片１５が係止片６の両側の先細溝６ｂ、６ｂと隔壁５ａ，５ｂの内壁等の収容部屋５の内壁とで形成される空間内に圧入されると、図３に示すように、この係止片６には、弾性片１５による生ずる復元力で分力ｆ３とこの分力ｆ３と直交する分力ｆ０の合力ｆ２が内側に向けて両側から作用すると共に、図４に示すように収容部屋５内壁の管軸と平行な分力ｆ１と収容部屋５内壁の管軸と直交する分力ｆ２の合力ｆが収容部屋５の弾性片１５とは反対側の内壁に向けて作用する。
【００２４】
次に、本発明の離脱防止装置の作用に付き以下説明する。
【００２５】
図１に示すように、予め一方の流体管の挿入口端部２外周に、複数の収容部屋５内にそれそれ係止片６を収容した環状ホルダ４を挿通保持した状態で、前記挿入口端部２を他方の受入口端部１の開口側から定位置まで挿入する。
【００２６】
次いで、受入口端部１のフランジ１ａのボルト挿通孔１ｂより挿通した連結ボルト１２の先端を環状ホルダ４のボルト挿通孔４ａに挿通し、ナット１４を締め込こんで環状ホルダ４を受入口端部１に強く引き寄せることで、環状の突出部４ｂにより受入口端部１の開口端縁の内周に形成されるパッキン収容凹部１ｃに嵌入されたパッキン３を外部から圧縮する。
【００２７】
パッキン３の圧縮が終了したところで、押しボルト１０を締め込み、係止片６の外周を押圧することで、図２の（ａ）に示すように、係止爪６ａを挿入口端部２の外周に対しｄだけ食い込ませた状態で係止する。
【００２８】
そこで、互いに連結されている流体管である受入口端部１と挿入口端部２が相互に移動し、挿入口端部２が受入口端部１から離れる方向（ａ方向）に変位するとき、係止片６は外周面６ｃないし後面６ｄが押しボルト１０ないし隔壁５ａの内壁で拘束されているので、外周面６ｂと押しボルト１０との接点を中心とする皿ばね作用によりｂ方向に回動し、その先端の係止爪６ａは挿入口端部２外周面の同一位置においてその円周方向に均等に食い込むことになり、挿入口端部２の離脱は確実に阻止されることになる。
【００２９】
従って、上記のように構成された流体管の離脱防止装置によれば、環状ホルダ４の環状溝の深さより浅い複数の隔壁５ａ、５ｂ…によって画成された複数の収容部屋５内に、互いに隣接する係止爪６ａの間隔が円周方向で最小隙間となるように係止片６を収容配置することで、係止爪６ａ単位の挿入口端部２外周に対する接触長さが拡大するので、相互の流体管に反対方向の変位ａが生じても各係止爪６ａに作用する食い込み力を円周方向に分散させることができ、相互の流体管の挿入端部外周を水密状態に保持しつつ相互の離脱を防止することができる。
【００３０】
また、各隔壁５ａ、５ｂ…によって円周方向の移動が拘束されたいる係止片６が各収容部屋５内に収容された際、各係止爪６ａの両端が両側の隔壁５ａ、５ｂ…の先端空間部に臨むように円周方向に延設されているので、環状ホルダ４に強度が要求される場合に隔壁５ａ、５ｂ…の肉厚を厚くしても、係止爪６ａの円周方向への延設の障害とならない。
【００３１】
さらに、係止片６の円周方向の両端部にはその片側面に中心に向けて開口する先細溝６ｂが形成され、この先細溝６ｂと収容部屋５の内壁とで形成される空間に弾性片１５を圧入して係止片６の両側を弾力的に押圧保持するように構成されているので、収容部屋５内に収容された係止片６を確実に保持することができる。
【００３２】
以上、本発明の実施形態を図面により説明してきたが、具体的な構成はこれら説明してきたものに限られるものではなく、例えば、収容部屋は環状ホルダの内周面に形成するようにしているが、環状ホルダを用いることなく直接受入口端部の内周面に形成するようにしてもよい。
【００３３】
【発明の効果】
本発明によれば、次のような効果を奏することができる。
【００３４】
（ａ）請求項１記載の発明によれば、互いに隣接する係止爪の間隔が円周方向で最小隙間となるように収容配置して、係止爪単位の流体管外周に対する接触長さが拡大することで、相互の流体管に離脱方向の変位が生じても各係止爪に過大な食い込み力を生起させることなく、前記流体管の挿入端部外周を水密状態で確実に接続することができる。
【００３５】
また、弾性片を先細溝内に圧入することによって収容部屋内に収容された係止片を確実に保持することができる。
【図面の簡単な説明】
【図１】本発明の一実施形態に係り、相互の流体管を水密に接続する離脱防止装置の断面図である。
【図２】図１のＡ−Ａ断面図であって（ａ）は管相互に軸方向の変位が生ずる前の状態を示し、（ｂ）は管相互に軸方向の変位が生じた状態を示す部分断面図である。
【図３】は環状ホルダ内に収容された係止爪の作用説明図である。
【図４】図３のＢ−Ｂ断面図である。
【図５】流体管の受入口端部と挿入口端部を接合した従来の離脱防止装置を示す断面図である。
【図６】図５のＣ−Ｃ断面図である。
【符号の説明】
１受入口端部
１ａフランジ
１ｂボルト挿通孔
１ｃパッキン収容凹部
２挿入口端部
３パッキン
４環状ホルダ
４ａボルト挿通孔
４ｂ突出部
５収容部屋
５ａ、５ｂ… 隔壁
６係止片
６ａ係止爪
６ｂ先細溝
６ｃ外周面
６ｄ後面
８ねじ孔
１０押しボルト
１２連結ボルト
１４ナット
１５弾性片
ａ変位
Ｌ間隔[0001]
BACKGROUND OF THE INVENTION
The present invention prevents the disconnection of the fluid pipe which inserts the insertion port end into the receiving end of a fluid pipe such as a water pipe, a gas pipe or a plant pipe and connects the fluid pipes in a watertight manner via a seal member. Relates to the device.
[0002]
[Prior art]
An example of this type of fluid pipe detachment prevention device is known from Japanese Patent Publication No. 3-55716.
[0003]
This fluid pipe detachment prevention device is shown in FIGS. 5 and 6, and FIG. 5 is a cross-sectional view showing a conventional detachment prevention device in which a receiving end and an insertion port end of a fluid pipe are joined together. 6 is a cross-sectional view taken along the line CC of FIG.
[0004]
In the separation preventing device 05 shown in FIG. 5, the insertion port end 02 of the other fluid pipe is inserted into the receiving end of one fluid pipe, and is connected in a watertight manner through a seal member (for example, packing) not shown. ing.
[0005]
On the front surface of the detachment prevention device 05, a hook portion is formed so as to project, and a fixing bolt is screwed into a screw hole (not shown) drilled in the hook portion 06, so that a receiving end portion is formed. The disengagement prevention device 05 is fixed by engaging with a jaw (not shown).
[0006]
A plurality of inner circumferential grooves 010 are formed in the circumferential direction with partition walls 011 on the inner circumferential surface of the separation preventing device 05, and screw holes 013 drilled at a plurality of locations on the outer circumferential surface are provided with the separation preventing device. 05 is formed to communicate with each inner circumferential groove 010 and face the center of the tube axis. A push bolt 017 is screwed into these screw holes 013, and will be described later at the tip of the push bolt 017 from the outer circumference in the circumferential direction. The locking piece 015 is configured to be pressed from the outside toward the center of the tube axis.
[0007]
In the inner peripheral groove 010 of the separation preventing device 05, arc-shaped locking pieces 015 are accommodated in an inclined state, and the locking pieces 015 have a substantially disc spring-like cross section. The outer peripheral surface 015a having generally elastic characteristics is formed in an arc shape, the inner surface is formed with a biting blade 015b, and the front surface 015c and the rear surface 015d are formed in parallel with each other. At both ends, a support member 016 made of a hard rubber body is interposed between the partition walls to hold the locking piece 015 in the inner circumferential groove 010.
[0008]
Therefore, as shown in FIG. 6, the engagement pieces 015 are engaged with the outer periphery of the insertion port end portion 02 in a bite manner by pressing the outer periphery with a push bolt 017 as shown in FIG. 6. Therefore, when the insertion port end portion 02 of the fluid pipes connected to each other is displaced in the direction a away from the receiving end portion (not shown), the outer peripheral surface 015a and the rear surface 015d of the locking piece 015 are the push bolt 017 and the inner peripheral surface. Since it is constrained by the groove 010, the bite blade 015b at the tip thereof is inserted into the insertion slot by swinging in the torsional direction (direction b) by the action of a disc spring around the contact point between the outer peripheral surface 015a and the bolt 017. The outer peripheral surface of the end portion 02 is bitten evenly and deeply in the circumferential direction. Then, when the rear surface 015d of the locking piece 015 comes into contact with the inner circumferential groove by the swinging in the b direction, the swinging action stops and the separation of the insertion port end portion 02 is prevented.
[0009]
[Problems to be solved by the invention]
However, the above-described conventional detachment preventing device 05 is configured such that both ends of the arc-shaped locking pieces 015 are intermittently arranged on the outer peripheral surface of the insertion port end portion 02 with a predetermined distance in the circumferential direction. Since the support member 016 is interposed therebetween, the working range of the biting blade 015b acting on the outer peripheral surface of the insertion port end portion 02 is small, and the biting force of the locking piece 015 with respect to the detachment force of the tube may be excessive. It was inevitable.
[0010]
Accordingly, when the insertion port end portion 02 is displaced in the direction a away from the receiving end portion, the portion 018 on the opposite side to the displacement direction of the biting blade 015b is raised by the pressing force of the locking piece 015, so that the coating is applied to this portion. The rust preventive agent thus peeled off, or the inner layer lining attached to the inner surface of the pipe peeled off.
[0011]
The present invention has been made to solve the above-described problems, and is a fluid pipe that can reliably connect the fluid pipes in a watertight state without excessive biting force acting on each locking claw. The object is to provide a separation prevention device.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the fluid pipe detachment preventing device according to the present invention inserts the insertion port end of the other fluid pipe into the receiving end of one fluid pipe, and connects both the fluid pipes in a watertight manner. In the fluid pipe detachment prevention device,
A plurality of partition walls facing the center formed shallower than the depth of the annular groove in the annular groove formed on the inner circumferential surface of the annular holder inserted into the insertion port end or the inner circumferential surface of the receiving end. A plurality of containment rooms defined by
Engagement that is constrained to move in the circumferential direction by the partition wall and is disposed in each of the storage chambers, and has tapered grooves that open toward the center at both ends in the circumferential direction, and has locking claws at the inner peripheral edge. A piece,
An elastic piece press-fitted into a space formed by the tapered groove of the locking piece and the inner wall of the accommodation chamber including the partition wall, and elastically press-holds both end sides of the locking piece,
Each locking piece has extended both ends positioned in a space formed between the outer peripheral surface of the insertion port end and the tip of the partition wall, and the locking pieces adjacent to each other in the space with both ends brought close to the disposing, the locking piece presses locking the insertion opening end outer periphery including a space portion of the partition wall tip of which in the locking claw of the peripheral edge by the pressing force from the outside It is characterized by that.
According to this feature, the contact length between the adjacent locking claws adjacent to each other is the smallest gap in the circumferential direction, and the contact length of the locking claw unit with respect to the outer periphery of the fluid pipe is increased. Even when displacement in the separation direction occurs in the fluid pipe, the outer periphery of the insertion end of the fluid pipe can be reliably connected in a watertight state without causing an excessive biting force on each locking claw.
[0013]
Moreover, the locking piece accommodated in the accommodation chamber can be reliably held by press-fitting the elastic piece into the tapered groove.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0015]
1 is a cross-sectional view of a separation preventing device for water-tightly connecting mutual fluid pipes according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. FIG. 3B shows a state before axial displacement occurs, FIG. 3B is a partial sectional view showing a state where axial displacement occurs between the tubes, and FIG. 3 is an operation explanatory view of the locking claw housed in the annular holder. 4 is a cross-sectional view taken along the line BB of FIG.
[0016]
Reference numerals 1 and 2 shown in FIG. 1 and FIG. 2 are a receiving end portion and an insertion opening end portion of fluid pipes connected to each other, and the receiving end portion 1 has a flange 1a at an outer end portion. Bolt insertion holes 1b are formed in the circumferential direction at equal intervals in 1a, and a packing 3 that seals the outer peripheral surface of the insertion port end 2 in a watertight manner in a packing receiving recess 1c formed in the inner periphery of the opening edge. Is inserted.
[0017]
Reference numeral 4 denotes an annular holder as a detachment preventing device fitted into the insertion port end 2, and the annular holder 4 is formed with a bolt insertion hole 4 a corresponding to the bolt insertion hole 1 b of the receiving end 1. Has been. Reference numeral 4 b denotes an annular protrusion that presses the packing 3 that protrudes from the front surface of the annular holder 4.
[0018]
As shown in FIG. 3, in the annular groove formed on the inner peripheral surface of the annular holder 4, a plurality of partition walls 5a, 5b... (6 in this embodiment) facing the center formed shallower than the depth of the annular groove. Are arranged in the circumferential direction, and a plurality of storage rooms 5 are defined by these partition walls 5a, 5b. Therefore, the storage chamber 5 is connected in a ring shape via the tip space portion of each partition wall 5a, 5b.
[0019]
Reference numeral 8 denotes a screw hole drilled at a plurality of locations in the circumferential direction of the annular holder 4, and this screw hole 8 communicates with a substantially center in the circumferential direction of the accommodation chamber 5 of the annular holder 4 to connect the tube shaft. It is drilled in the center direction.
[0020]
As shown in FIGS. 1 and 2, each storage chamber 5 of the annular holder 4 stores an arcuate locking piece 6 having a locking claw 6 a having a mountain-shaped cross section projecting at an acute angle on the inner peripheral edge. These locking pieces 6 are made of ductile cast iron or steel metal.
[0021]
As shown in FIG. 3, the locking piece 6 has a square cross section, and both ends of the locking claw 6a are extended in the circumferential direction so as to face the tip spaces of the partition walls 5a and 5b on both sides. The nail | interval L of the stop piece 6 is adjoining infinitely. Further, tapered grooves 6 b that open toward the center are formed at both ends of the locking piece 6.
[0022]
Reference numeral 15 denotes an elastic piece. The elastic piece 15 is formed of, for example, a rubber material and is formed into a tapered shape having a taper shape with an angle of one side of θ, and is formed at both ends of the locking piece 6. By pressing the elastic pieces 15 into the space formed by the grooves 6b and 6b and the inner walls of the partition walls 5a and 5b or the inner wall of the storage chamber 5, both sides of the locking pieces 6 are elastically pressed and held. It has come to be.
[0023]
That is, when the elastic piece 15 is press-fitted into a space formed by the tapered grooves 6b and 6b on both sides of the locking piece 6 and the inner wall of the housing room 5 such as the inner walls of the partition walls 5a and 5b, it is shown in FIG. As described above, the resultant force f2 of the component force f3 and the component force f0 orthogonal to the component force f3 acts on the locking piece 6 from both sides by the restoring force generated by the elastic piece 15, and is shown in FIG. As shown, the resultant force f of the component force f1 parallel to the tube axis of the inner wall of the storage chamber 5 and the component force f2 perpendicular to the tube axis of the inner wall of the storage chamber 5 is directed toward the inner wall on the opposite side of the elastic piece 15 of the storage chamber 5. Works.
[0024]
Next, the operation of the separation preventing device of the present invention will be described below.
[0025]
As shown in FIG. 1, in the state in which the annular holder 4 that accommodates the locking pieces 6 in the plurality of accommodation chambers 5 is inserted and held in advance on the outer periphery of the insertion port end 2 of one fluid pipe. The end 2 is inserted from the opening side of the other receiving end 1 to a fixed position.
[0026]
Next, the tip of the connecting bolt 12 inserted through the bolt insertion hole 1b of the flange 1a of the receiving end 1 is inserted into the bolt insertion hole 4a of the annular holder 4, the nut 14 is tightened, and the annular holder 4 is inserted into the receiving end. By strongly attracting the part 1, the packing 3 fitted in the packing accommodating recess 1c formed on the inner periphery of the opening end edge of the receiving end 1 is compressed from the outside by the annular protrusion 4b.
[0027]
When the compression of the packing 3 is completed, the locking bolt 6 is tightened and the outer periphery of the locking piece 6 is pressed, so that the locking claw 6a is inserted into the insertion port end 2 as shown in FIG. Lock in a state where only d is intruded into the outer periphery.
[0028]
Therefore, when the inlet end 1 and the insertion port end 2, which are fluid pipes connected to each other, move relative to each other, and the insertion port end 2 is displaced in the direction away from the reception port end 1 (direction a). Since the outer peripheral surface 6c or the rear surface 6d of the locking piece 6 is constrained by the inner wall of the push bolt 10 or the partition wall 5a, the locking piece 6 is rotated in the b direction by the disc spring action centering on the contact point between the outer peripheral surface 6b and the push bolt 10. Thus, the locking claw 6a at the tip end bites evenly in the circumferential direction at the same position on the outer peripheral surface of the insertion port end 2 and the separation of the insertion port end 2 is reliably prevented. .
[0029]
Therefore, according to the fluid pipe detachment preventing device configured as described above, the plurality of storage chambers 5 defined by the plurality of partition walls 5a, 5b,... Shallower than the depth of the annular groove of the annular holder 4 are mutually connected. Since the locking piece 6 is accommodated and disposed so that the interval between the adjacent locking claws 6a is the smallest gap in the circumferential direction, the contact length with respect to the outer periphery of the insertion port end 2 of the locking claw 6a is increased. Even if displacement a in the opposite direction occurs in the mutual fluid pipe, the biting force acting on each locking claw 6a can be distributed in the circumferential direction, and the outer periphery of the insertion end of the mutual fluid pipe is kept in a watertight state. However, mutual separation can be prevented.
[0030]
Further, when the locking pieces 6 whose movement in the circumferential direction is restrained by the respective partition walls 5a, 5b... Are accommodated in the respective storage chambers 5, both ends of the respective locking claws 6a are on the partition walls 5a, 5b. Is extended in the circumferential direction so as to face the distal end space portion, and when the strength of the annular holder 4 is required, even if the partition walls 5a, 5b. Does not obstruct the extension in the circumferential direction.
[0031]
Furthermore, a tapered groove 6b that opens toward the center is formed on one side surface of both ends of the locking piece 6 in the circumferential direction, and the space formed by the tapered groove 6b and the inner wall of the accommodating chamber 5 is elastic. Since the piece 15 is press-fitted and elastically pressed and held on both sides of the locking piece 6, the locking piece 6 accommodated in the accommodation room 5 can be reliably held.
[0032]
The embodiments of the present invention have been described with reference to the drawings. However, the specific configuration is not limited to those described above. For example, the accommodation chamber is formed on the inner peripheral surface of the annular holder. However, it may be formed directly on the inner peripheral surface of the receiving end without using an annular holder.
[0033]
【The invention's effect】
According to the present invention, the following effects can be achieved.
[0034]
(A) According to the first aspect of the present invention, the contact lengths of the locking claws with respect to the outer periphery of the fluid pipe are arranged so that the interval between the locking claws adjacent to each other is the smallest gap in the circumferential direction. By enlarging, the outer periphery of the insertion end of the fluid pipe can be securely connected in a watertight state without causing excessive biting force on each locking claw even if displacement in the separation direction occurs between the fluid pipes. Can do.
[0035]
Moreover, the locking piece accommodated in the accommodation chamber can be reliably held by press-fitting the elastic piece into the tapered groove.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a detachment preventing device for water-tightly connecting mutual fluid pipes according to an embodiment of the present invention.
2A is a cross-sectional view taken along the line AA of FIG. 1. FIG. 2A shows a state before axial displacement occurs between the tubes, and FIG. 2B shows a state where axial displacement occurs between the tubes. It is a fragmentary sectional view shown.
FIG. 3 is an operation explanatory view of a locking claw housed in an annular holder.
4 is a cross-sectional view taken along the line BB in FIG.
FIG. 5 is a cross-sectional view showing a conventional detachment prevention device in which a receiving end and an insertion port end of a fluid pipe are joined.
6 is a cross-sectional view taken along the line CC of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Receiving end 1a Flange 1b Bolt insertion hole 1c Packing accommodation recessed part 2 Insertion port end 3 Packing 4 Annular holder 4a Bolt insertion hole 4b Projection part 5 Storage chamber 5a, 5b ... Partition 6 Locking piece 6a Locking claw 6b Tapering Groove 6c Outer peripheral surface 6d Rear surface 8 Screw hole 10 Push bolt 12 Connection bolt 14 Nut 15 Elastic piece a Displacement L Interval

Claims

In the fluid pipe detachment preventing device, the insertion end of the other fluid pipe is inserted into the receiving end of the one fluid pipe, and the two fluid pipes are connected in a watertight manner.
A plurality of partition walls facing the center formed shallower than the depth of the annular groove in the annular groove formed on the inner circumferential surface of the annular holder inserted into the insertion port end or the inner circumferential surface of the receiving end. A plurality of containment rooms defined by
Engagement that is constrained to move in the circumferential direction by the partition wall and is disposed in each of the storage chambers, and has tapered grooves that open toward the center at both ends in the circumferential direction, and has locking claws at the inner peripheral edge. A piece,
An elastic piece press-fitted into a space formed by the tapered groove of the locking piece and the inner wall of the accommodation chamber including the partition wall, and elastically press-holds both end sides of the locking piece,
Each locking piece has extended both ends positioned in a space formed between the outer peripheral surface of the insertion port end and the tip of the partition wall, and the locking pieces adjacent to each other in the space with both ends brought close to the disposing, the locking piece presses locking the insertion opening end outer periphery including a space portion of the partition wall tip of which in the locking claw of the peripheral edge by the pressing force from the outside An apparatus for preventing detachment of a fluid pipe.