JPH059674B2 - - Google Patents
Info
- Publication number
- JPH059674B2 JPH059674B2 JP2007966A JP796690A JPH059674B2 JP H059674 B2 JPH059674 B2 JP H059674B2 JP 2007966 A JP2007966 A JP 2007966A JP 796690 A JP796690 A JP 796690A JP H059674 B2 JPH059674 B2 JP H059674B2
- Authority
- JP
- Japan
- Prior art keywords
- union
- flange
- union nut
- nut
- joint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 229920003002 synthetic resin Polymers 0.000 claims description 13
- 239000000057 synthetic resin Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
Landscapes
- Joints With Pressure Members (AREA)
- Branch Pipes, Bends, And The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は少なくともユニオンナツトが合成樹脂
材からなるユニオン継手の製造方法に関し、詳細
には一端にユニオン鍔部が形成された短管であつ
て、他端からユニオンナツトを遊嵌できない継手
において、ユニオンナツトを簡単に遊嵌すること
のできるユニオン継手の製造方法に関するもので
ある。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a union joint in which at least a union nut is made of a synthetic resin material, and more specifically, the present invention relates to a method for manufacturing a union joint in which at least a union nut is made of a synthetic resin material, and more specifically, the present invention relates to a method for manufacturing a union joint in which at least a union nut is made of a synthetic resin material. This invention relates to a method for manufacturing a union joint in which a union nut can be easily fitted loosely into a joint in which a union nut cannot be loosely fitted from the other end.
［従来の技術］
第１図は近年開発された合成樹脂製のフランジ
付ユニオン継手を示す一部切除側面説明図であ
る。ボールバルブ（以下バルブという）２の両側
（図では片側を省略して示している）に合成樹脂
製のフランジ付き短管（以下単に短管という）１
を配置してユニオン継手部を構成している。即ち
ユニオン継手部は短管１をユニオンナツト（以下
袋ナツトともいう）４によつてバルブ２の接合端
部に突合わせ接続すると共に、短管１のフランジ
３には図示しない他のフランジ継手等をして介パ
イプあるいは装置類が接続される。そしてバルブ
２と短管１との接続部には、前記したユニオンナ
ツト４が適用される。通常短管１には環状のユニ
オン鍔部５が設けられ、ユニオンナツト４の鍔部
６でユニオン鍔部５を係止してバルブ２の接続端
面へ押し付ける様に構成している。その為前記鍔
部６はユニオン鍔部５とフランジ３の間に配設し
なければならないが、鍔部６の内径D1はユニオ
ン鍔部５の外径d1よりも小さいので、従来では短
管１は前記ユニオン鍔部５付きの短管７とフラン
ジ３を別体に分割成形しておき、短管１の組立て
に当つては、まず短管部７の雄ねじ７ａ刻設側か
らユニオンナツト４を被挿した後、該雄ねじ７ａ
に接着剤等を塗布した上でフランジ３を螺合する
ことにより、両者を一体的に接合している。[Prior Art] FIG. 1 is a partially cutaway side view showing a flanged union joint made of synthetic resin that has been developed in recent years. A synthetic resin flanged short pipe (hereinafter simply referred to as short pipe) 1 is installed on both sides (one side is omitted in the figure) of a ball valve (hereinafter referred to as valve) 2.
are arranged to form the union joint. That is, the union joint part butts and connects the short pipe 1 to the joint end of the valve 2 with a union nut (hereinafter also referred to as a cap nut) 4, and also connects the flange 3 of the short pipe 1 with other flange joints (not shown). Then pipes or equipment are connected. The above-mentioned union nut 4 is applied to the connection between the valve 2 and the short pipe 1. Usually, the short pipe 1 is provided with an annular union flange 5, and the union flange 5 is locked by the flange 6 of the union nut 4 and is configured to be pressed against the connection end surface of the valve 2. Therefore, the flange 6 must be disposed between the union flange 5 and the flange 3, but since the inner diameter D 1 of the flange 6 is smaller than the outer diameter d 1 of the union flange 5, conventionally the flange 6 has been shortened. The pipe 1 is formed by separately molding the short pipe 7 with the union collar 5 and the flange 3, and when assembling the short pipe 1, first insert the union nut from the male thread 7a side of the short pipe part 7. After inserting 4, the male screw 7a
The two are integrally joined by applying an adhesive or the like to the two and then screwing the flange 3 together.
ところが上記フランジ接合部分において装置振
動や管の伸縮等によつて生じるスラスト荷重が専
らフランジ３にかかるので、これらの外力に対す
る内部応力はフランジ３の根元部に集中し特にフ
ランジ３の短管部７側の周面（矢印Ａの部分）に
集中する。しかるに上記短管部７の周面には前述
の如くフランジ接合用の雄ねじ７ａが刻設されて
おり、上記応力集中は雄ねじ７ａの刻設開始端７
ｂとも一致しているので、当該刻設開始端７ｂに
対する応力集中が一層助長され、フランジ根元部
で図示する様なクラツク１０が発生し易いという
問題がある。 However, at the flange joint portion, thrust loads generated due to equipment vibration, expansion and contraction of the pipe, etc. are applied exclusively to the flange 3, so the internal stress in response to these external forces is concentrated at the root of the flange 3, particularly at the short pipe portion 7 of the flange 3. Concentrate on the side circumferential surface (arrow A). However, as mentioned above, the external thread 7a for flange connection is formed on the circumferential surface of the short pipe section 7, and the stress concentration occurs at the starting end 7 of the external thread 7a.
Since it also coincides with b, stress concentration on the engraving start end 7b is further promoted, and there is a problem in that a crack 10 as shown in the figure is likely to occur at the flange root.
また上記短管部７とフランジ３を使つてフラン
ジ付ユニオン継手を組立てるに当つては、接合位
置を合わすための治具や設着剤等を段取りしなけ
ればならず、作業性が低いという不具合もあつ
た。 In addition, when assembling a flanged union joint using the short pipe section 7 and flange 3, it is necessary to set up jigs and adhesives to align the joint positions, resulting in a problem of low work efficiency. It was hot too.
［発明が解決しようとする課題］
本発明は以上の様な事情に着目してなされたも
のであつて、上記の様にユニオンナツトを短管に
遊嵌した後に、別体に形成されたフランジ３等の
他部材を取付けるものではなく、フランジ等が一
体成形された短管であつても該短管にユニオンナ
ツトが遊嵌されたユニオン継手を提供する点に主
たる目的がある。[Problems to be Solved by the Invention] The present invention has been made with attention to the above-mentioned circumstances, and the present invention has been made by focusing on the above-mentioned circumstances. The main purpose of this invention is to provide a union joint in which a union nut is loosely fitted into a short pipe, even if it is a short pipe with an integrally formed flange, etc., rather than to which other members such as No. 3 are attached.
また他の目的としては、ユニオンナツトの遊嵌
作業を簡単に行なうことのできるユニオン継手の
製造方法を提供する点にある。 Another object of the present invention is to provide a method for manufacturing a union joint that allows easy loose fitting of a union nut.
［課題を解決するための手段］
上記目的を達成した本発明とは、少なくとも一
端に環状のユニオン鍔部を一体的に形成した短管
に合成樹脂製ユニオンナツトを遊嵌するに当た
り、該ユニオンナツトの鍔部を加熱し、該鍔部を
一時的に拡張して前記ユニオン鍔部を乗り越える
様に遊嵌することを要旨とするものである。[Means for Solving the Problems] The present invention, which achieves the above object, provides a method for loosely fitting a synthetic resin union nut into a short tube integrally formed with an annular union flange at at least one end. The gist is to heat the flange of the union flange, temporarily expand the flange, and fit loosely over the union flange.
［作用及び実施例］
以下実施例を示す図面に基づいて本発明の構成
及び作用効果を具体的に説明するが、下記実施例
は一具体例にすぎず、もとより前・後記の趣旨に
徴して種々設計を変更することは、いずれも本発
明の技術範囲に含まれる。[Operations and Examples] The structure and operation effects of the present invention will be specifically explained below based on the drawings showing the examples. Various changes in design are included within the technical scope of the present invention.
第２図は本発明によつて製造されたフランジ付
ユニオン継手の断面図、第３図は該継手の製造方
法を例示する要部断面説明図である。第２図にお
いて、短管１は短管部７の一端にユニオン鍔部
５、他端にフランジ３を夫々一体的に形成（例え
ば射出形成）すると共に、短管部７の外周には、
ユニオン鍔部５の外径d1より小さい内径D1の鍔
部６を有する合成樹脂製ユニオンナツト４を遊嵌
し、フランジ付ユニオン継手を形成している。本
発明に係るユニオン継手の製造方法はユニオンナ
ツト４素材の加熱変形を利用し、前記ユニオン鍔
部５の形成側から該ユニオン鍔部５を乗り越える
様にユニオンナツト４を遊嵌する方法であり、以
下にその例を詳述する。ユニオンナツト４の遊嵌
に当つては、まずユニオンナツトの鍔部６をわず
かに塑性加工できる程度に加熱し、一時的に拡張
する。ポリ塩化ビニル製のユニオンナツトであれ
ば120〜130℃位の加熱で拡張可能である。即ちユ
ニオンナツトにおける鍔部６の内径D1を加熱し
た上で塑性加工し、ユニオン鍔部５の外径d1と同
程度又はそれより若干大きくなるまで拡張し、そ
の状態で前記鍔部６をユニオン鍔部５の外側を移
動していくと、拡張されている鍔部６はユニオン
鍔部５を容易に越えて短管部７のまわりに遊嵌さ
れる。その後一時的に拡張した鍔部６は自然冷却
又は強制冷却して所定の径に縮径する。尚自然放
冷的に冷却すれば素材自身の復元力によつて拡張
部分が復元し、ユニオンナツト４が遊嵌されて第
２図の如きユニオン継手部を得ることができる
が、その他矯正治具等を用いて復元するものであ
つても良い。 FIG. 2 is a cross-sectional view of a flanged union joint manufactured according to the present invention, and FIG. 3 is a cross-sectional explanatory view of a main part illustrating a method of manufacturing the joint. In FIG. 2, the short tube 1 has a union collar 5 at one end of the short tube section 7 and a flange 3 at the other end integrally formed (for example, by injection molding), and on the outer periphery of the short tube section 7.
A synthetic resin union nut 4 having a flange 6 having an inner diameter D 1 smaller than the outer diameter d 1 of the union flange 5 is loosely fitted to form a flanged union joint. The method for manufacturing a union joint according to the present invention is a method of loosely fitting the union nut 4 so as to ride over the union flange 5 from the side where the union flange 5 is formed, using thermal deformation of the union nut 4 material, An example is detailed below. To loosely fit the union nut 4, first the flange 6 of the union nut is heated to an extent that it can be slightly plastically worked, and is temporarily expanded. Union nuts made of polyvinyl chloride can be expanded by heating to about 120-130°C. That is, the inner diameter D 1 of the flange 6 of the union nut is heated and plastically worked to expand it to the same extent or slightly larger than the outer diameter d 1 of the union flange 5, and in this state, the flange 6 is As it moves outside the union flange 5, the expanded flange 6 easily passes over the union flange 5 and is loosely fitted around the short tube part 7. Thereafter, the temporarily expanded flange portion 6 is cooled naturally or forcedly, and is reduced to a predetermined diameter. If the material is allowed to cool naturally, the expanded portion will be restored by the restoring force of the material itself, and the union nut 4 will be loosely fitted to form a union joint as shown in Fig. 2. It is also possible to restore the data using a method such as the following.
第３図は加熱したユニオンナツト鍔部６の拡張
用として拡張ガイド１１を、又縮径復元用として
矯正治具１２を用いた例を示している。拡張ガイ
ド１１は上部がユニオンナツト４における鍔部６
の内径と同じか、若干小さい内径を有し、ユニオ
ン鍔部５上に載置されるべき下端の直径はユニオ
ン鍔部５の外径と同じか若干大きい外径を有し、
上部から下部にかけてテーパー状の漸拡稜面を有
する円錐台状に形成されている。ユニオンナツト
４の被挿に当つては、短管１を第３図に示す様に
ユニオン鍔部５を上にして配置し、該ユニオン鍔
部５の端面に拡張ガイド１１を載置する。加熱さ
れたユニオンナツトの鍔部６の拡張ガイド１１の
上方から被せる様にてユニオンナツト４全体を矢
印Ｂ方向に押しこむと、加熱されたユニオンナツ
トの鍔部６は拡張ガイド１１の前記テーパー状漸
拡稜面に沿つて拡張しつつ下降し、拡張ガイド１
１の最下面即ちユニオン鍔部５の端面近傍ではユ
ニオン鍔部５の外径d1と同じか又はそれより大径
になり、ユニオン鍔部５を一気に越えて短管部７
へ進出しフランジ３上へ落下する。一方フランジ
３上には別の拡縮径可能な円筒状の矯正治具１２
を拡径状態（破線で示す）で載置しておき、ユニ
オンナツト４の外周から内側（矢印Ｃ方向）へ縮
小（実線で示す）すると、一時的に拡張されてい
るユニオンナツト４の鍔部６が縮径復元する。矯
正治具１２による縮径量を前もつて決めておけ
ば、ユニオン押え鍔部６の内径は所定の径に復元
させることができる。冷却後拡張ガイド１１及び
矯正治具１２を取除く。 FIG. 3 shows an example in which an expansion guide 11 is used to expand the heated union nut flange 6, and a correction jig 12 is used to restore the diameter of the heated union nut. The upper part of the expansion guide 11 is the flange part 6 of the union nut 4.
The diameter of the lower end to be placed on the union flange 5 is the same as or slightly larger than the outer diameter of the union flange 5,
It is formed in the shape of a truncated cone with a gradually expanding ridge surface that tapers from the top to the bottom. To insert the union nut 4, the short tube 1 is placed with the union collar 5 facing upward, as shown in FIG. 3, and the expansion guide 11 is placed on the end surface of the union collar 5. When the entire union nut 4 is pushed in the direction of arrow B so as to cover the heated flange 6 of the union nut from above the expansion guide 11, the heated flange 6 of the union nut will fit into the tapered shape of the expansion guide 11. The expansion guide 1 descends while expanding along the gradual expansion ridge surface.
1, that is, near the end surface of the union flange 5, the outer diameter d1 of the union flange 5 becomes equal to or larger than the outer diameter d1 of the union flange 5, and the short pipe part 7 immediately passes over the union flange 5.
and falls onto flange 3. On the other hand, on the flange 3 is another cylindrical correction jig 12 that can be expanded and contracted.
is placed in an enlarged diameter state (indicated by the broken line), and when the union nut 4 is contracted inward (in the direction of arrow C) from the outer periphery (indicated by the solid line), the temporarily expanded flange of the union nut 4 6 is restored to its reduced diameter. If the amount of diameter reduction by the correction jig 12 is determined in advance, the inner diameter of the union presser flange portion 6 can be restored to a predetermined diameter. After cooling, the expansion guide 11 and correction jig 12 are removed.
この様にして得られたユニオン継手は高強度で
あつてフランジ根元部でクラツクが発生する様な
事故はなくなり、またユニオンナツト遊嵌作業の
簡略化により組立工数が減ると共に、ユニオンナ
ツトの遊嵌にあたつて行うユニオンナツトの鍔部
６の拡径作業も無理がなく、しかも各部均一に必
要量だけ拡張でき、挿入後一時的に拡張された前
記鍔部６の復元も均一に行なえ、品質的に変動の
少ないフランジ付ユニオン継手を製造することが
できる。 The union joint obtained in this way has high strength, eliminates accidents such as cracks occurring at the base of the flange, and simplifies the work of loosely fitting the union nut, reducing assembly man-hours. The work to expand the diameter of the flange 6 of the union nut during the process is easy, and each part can be expanded uniformly by the required amount, and the flange 6, which has been temporarily expanded after insertion, can be restored uniformly, improving quality. It is possible to manufacture flanged union joints with less fluctuation in terms of performance.
なお本発明に適用されるユニオン継手部はポリ
塩化ビニル樹脂製のものに限らず熱可塑性を有す
る合成樹脂であれば公知の何れでも使用できる。 The union joint part applied to the present invention is not limited to one made of polyvinyl chloride resin, but any known synthetic resin having thermoplasticity can be used.
［発明の効果］
本発明は以上の様に構成されているので、本発
明によつて製造されるユニオン継手はユニオン鍔
部を形成した短管とフランジ等の接続部を一体成
形品として製作できるので、該継手部における機
械的強度が向上し、クラツクの発生を可及的に防
止することができる。[Effects of the Invention] Since the present invention is configured as described above, the union joint manufactured according to the present invention can be manufactured as an integrally molded product in which the short pipe forming the union collar and the connecting portion such as the flange are integrally molded. Therefore, the mechanical strength of the joint is improved, and the occurrence of cracks can be prevented as much as possible.
また本発明方法では合成樹脂製ユニオンナツト
をユニオン鍔部側から簡単な作業によつて遊嵌す
ることができ、効率的な生産ができる様になつ
た。 Furthermore, according to the method of the present invention, the synthetic resin union nut can be fitted loosely from the union flange side with a simple operation, making it possible to achieve efficient production.
第１図は従来例を示す合成樹脂製のフランジ付
ユニオン短管の一部切除側面説明図、第２図は本
発明によつて製造されたフランジ付ユニオン継手
の断面図、第３図は本発明の製造方法の一例を示
す要部断面説明図である。
１……短管、２……バルブ、３……フランジ、
４……ユニオンナツト、５……ユニオン鍔部、６
……鍔部、７……短管部、１１……拡張ガイド、
１２……矯正治具。
Fig. 1 is a partially cut-away side view of a synthetic resin flanged union short pipe showing a conventional example, Fig. 2 is a cross-sectional view of a flanged union joint manufactured according to the present invention, and Fig. 3 is the present invention. FIG. 2 is an explanatory cross-sectional view of a main part showing an example of the manufacturing method of the invention. 1...Short pipe, 2...Valve, 3...Flange,
4...Union nut, 5...Union collar, 6
... Flange section, 7 ... Short pipe section, 11 ... Expansion guide,
12...Correction jig.
Claims (1)
短管に、ユニオンナツトを遊嵌してなる合成樹脂
製ユニオン継手を製造する方法であつて、前記ユ
ニオンナツトの鍔部を加熱し、該ユニオンナツト
の鍔部を一時的に拡張して前記ユニオン鍔部を乗
り越えさせ、前記短管にユニオンナツトを遊嵌す
ることを特徴とする合成樹脂製ユニオン継手の製
造方法。 ２ ユニオン鍔部の端部に円錐台形の拡張ガイド
を配設し、該拡張ガイド周面に沿わせてユニオン
ナツトの鍔部を拡張する特許請求の範囲第１項に
記載の合成樹脂製ユニオン継手の製造方法。[Scope of Claims] 1. A method for manufacturing a synthetic resin union joint in which a union nut is loosely fitted into a short tube integrally formed with an annular union flange at one end, the method comprising: A method for manufacturing a synthetic resin union joint, which comprises heating the union nut, temporarily expanding the flange of the union nut to overcome the union flange, and loosely fitting the union nut into the short pipe. 2. The synthetic resin union joint according to claim 1, wherein a truncated conical expansion guide is disposed at the end of the union flange, and the flange of the union nut is expanded along the peripheral surface of the expansion guide. manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP796690A JPH02300596A (en) | 1990-01-16 | 1990-01-16 | Method for manufacturing synthetic resin made union joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP796690A JPH02300596A (en) | 1990-01-16 | 1990-01-16 | Method for manufacturing synthetic resin made union joint |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8885083A Division JPS59217089A (en) | 1983-05-19 | 1983-05-19 | Union joint with flange made of synthetic resin and manufacture thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02300596A JPH02300596A (en) | 1990-12-12 |
| JPH059674B2 true JPH059674B2 (en) | 1993-02-05 |
Family
ID=11680209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP796690A Granted JPH02300596A (en) | 1990-01-16 | 1990-01-16 | Method for manufacturing synthetic resin made union joint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02300596A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04248095A (en) * | 1991-01-24 | 1992-09-03 | Nippon Pillar Packing Co Ltd | Structure of pipe joint for hydraulic equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS518151A (en) * | 1974-06-12 | 1976-01-22 | Mtu Muenchen Gmbh | |
| JPS536087U (en) * | 1976-07-01 | 1978-01-19 |
-
1990
- 1990-01-16 JP JP796690A patent/JPH02300596A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS518151A (en) * | 1974-06-12 | 1976-01-22 | Mtu Muenchen Gmbh | |
| JPS536087U (en) * | 1976-07-01 | 1978-01-19 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02300596A (en) | 1990-12-12 |
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