JP2007051678A

JP2007051678A - Pipe joint

Info

Publication number: JP2007051678A
Application number: JP2005237030A
Authority: JP
Inventors: Hidekazu Yamana; 秀和山名
Original assignee: Tigers Polymer Corp
Current assignee: Tigers Polymer Corp
Priority date: 2005-08-18
Filing date: 2005-08-18
Publication date: 2007-03-01

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint which eliminates use of an adhesive in connection between a pipe body to be connected and a hard-resin made pipe joint, and also, capable of constituting a connection structure excellent in adhesion in-between the pipe body. <P>SOLUTION: A soft layer made of a soft material is formed on at least the inner peripheral face of at least one connection end part of a joint body formed of a hard material. The whole part from the inner peripheral face to the outer peripheral face of the one connection end part is formed of a soft layer. A single or a plurality of thin-walled parts are formed to the connection end part along in the axial direction. The pipe body to be connected is connected by fastening the outer periphery of the connection end part with a fastening member. The joint body made of a hard resin and the soft layer made of a soft resin are formed by fusing integrally with each other by injection molding. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、配管の直線部や湾曲部などを構成する管継手に関する。 The present invention relates to a pipe joint constituting a straight part or a curved part of a pipe.

管体例えば塩化ビニル管(ＰＶＣ管)などの硬質樹脂管の配管は、管継手を介して管体同士を連結して行われるが、管継手として配管の連結部位の形態等に応じて各種のものがあり、例えば、管体同士を連結するためのソケット継手、ニップル継手、異方向からの管体同士を連結するための湾曲部を有するエルボ継手、分岐部を形成するためのチーズ継手などが知られている。 Piping of rigid resin pipes such as pipes such as vinyl chloride pipes (PVC pipes) is performed by connecting the pipes together via pipe joints. For example, there are socket joints for connecting pipes, nipple joints, elbow joints having curved parts for connecting pipes from different directions, cheese joints for forming branch parts, etc. Are known.

上記管継手は一般に接続すべき管体と同材質のものが使用され、ＰＶＣ管の接続には硬質のＰＶＣ製管継手が使用され、その接続口に接着剤を塗布したＰＶＣ管の端部を差し込んで接着することが必要である。なお、硬質のＰＶＣ製管継手は可撓性や耐衝撃性に劣るので、下記特許文献１においては、管継手の材料としてＰＶＣとエラストマーをブレンドした材料を用いることが提案されている。
特開平１１−６５９５号公報 The pipe joint is generally made of the same material as the pipe to be connected. A PVC pipe joint is used to connect the PVC pipe, and the end of the PVC pipe coated with an adhesive is connected to the connection port. It is necessary to insert and bond. In addition, since a hard PVC pipe joint is inferior in flexibility and impact resistance, in the following Patent Document 1, it is proposed to use a material obtained by blending PVC and an elastomer as a pipe joint material.
Japanese Patent Laid-Open No. 11-6595

しかし、硬質ＰＶＣを主体とする管継手は接続すべき管体と接着による接合一体化を図るものであり、接着剤塗布の面倒な作業を要するほか、管体との密着性が弱く接続部における流体漏洩の虞れという問題がある。 However, pipe joints mainly composed of hard PVC are intended to be joined and integrated with the pipe bodies to be connected, require troublesome work of adhesive application, and have poor adhesiveness with the pipe bodies. There is a problem of fear of fluid leakage.

本発明は、上記の問題に鑑み、接続すべき管体と硬質樹脂製管継手の接続における接着剤使用を不要にでき、かつ、管体との密着性が優れた接続構造を構成できる管継手を提供することを課題とするものである。 In view of the above problems, the present invention eliminates the use of an adhesive in the connection between a pipe body to be connected and a hard resin pipe joint, and can constitute a connection structure having excellent adhesion to the pipe body. It is a problem to provide.

すなわち本発明は、配管の直管部、湾曲部等を構成する管継手であり、硬質材料により形成された継手本体の少なくとも一方の接続端部の少なくとも内周面に軟質材料よりなる軟質層を形成したことを特徴とする(請求項１)。上記管継手において、一方の接続端部の内周面から外周面に至る全体を軟質層に形成することができる(請求項２)。上記いずれの管継手においても、接続端部に軸方向に沿って単一または複数の薄肉部を形成し、この接続端部の外周を締付部材により締付けて接続すべき管体を接続することができる(請求項３)。また、上記いずれの管継手においても、硬質樹脂よりなる継手本体と軟質樹脂よりなる軟質層とを射出成形により融着一体化させて形成することができる(請求項４)。 That is, the present invention is a pipe joint that constitutes a straight pipe part, a curved part, etc. of piping, and a soft layer made of a soft material is provided on at least the inner peripheral surface of at least one connection end part of a joint body formed of a hard material. It is formed (claim 1). In the pipe joint, the whole of the connecting end portion from the inner peripheral surface to the outer peripheral surface can be formed in the soft layer. In any of the above pipe joints, a single or a plurality of thin wall portions are formed in the connecting end portion along the axial direction, and the outer periphery of the connecting end portion is tightened by a tightening member to connect a pipe body to be connected. (Claim 3). In any of the above-described pipe joints, the joint body made of hard resin and the soft layer made of soft resin can be formed by fusing and integrating by injection molding.

本発明によれば、硬質材料からなる継手本体により強度を維持しつつ、接続端部の内周面を軟質部に形成(接続端部全体を軟質部に形成する場合も含む)したので、接続する管体との密着性が向上し接着剤による接着を必ずしも必要としないし、シール性を確保できる。また、薄肉部を設けた接続端部の外周を締付部材により緊締する場合にはシール性をより高めることができる。さらに、継手本体と軟質部を射出成形により融着一体化すれば、両者の接合が強力な管継手を容易に成形することができる。 According to the present invention, the strength of the joint body made of a hard material is maintained, and the inner peripheral surface of the connection end is formed in the soft part (including the case where the entire connection end is formed in the soft part). Adhesiveness with the pipe body to be improved is improved, adhesion with an adhesive is not necessarily required, and sealing performance can be secured. Further, when the outer periphery of the connection end portion provided with the thin portion is tightened by the tightening member, the sealing performance can be further improved. Furthermore, if the joint body and the soft part are fused and integrated by injection molding, a pipe joint having a strong joint can be easily formed.

次に本発明の実施形態を図面により説明する。図１は本発明におけるエルボ状の管継手の断面図、図２は図１の管継手の一部切欠斜視図である。 Next, embodiments of the present invention will be described with reference to the drawings. 1 is a cross-sectional view of an elbow-shaped pipe joint according to the present invention, and FIG. 2 is a partially cutaway perspective view of the pipe joint of FIG.

管継手１は、略直角に折れ曲がった硬質ＰＶＣにより形成された継手本体２と、この継手本体２の両端部に設けた２つの接続端部３ａ，３ｂを有し、一方の接続端部３ａの内周面に軟質ＰＶＣからなる軟質層４が形成されている。この接続端部３aには、周方向における相対する２つの位置に継手本体２の肉厚を切り欠いて形成した薄肉部５，５が軸方向に沿って設けられている。図示しない接続すべき樹脂管などの管体が接続端部３a内側に挿入され、接続端部３aの外周をＣリング６により締付けて管体との接続が行なわれる。 The pipe joint 1 has a joint body 2 formed of rigid PVC bent at a substantially right angle, and two connection ends 3a and 3b provided at both ends of the joint body 2, and one of the connection ends 3a A soft layer 4 made of soft PVC is formed on the inner peripheral surface. The connection end portion 3a is provided with thin portions 5 and 5 along the axial direction, which are formed by notching the thickness of the joint body 2 at two opposite positions in the circumferential direction. A pipe body such as a resin pipe (not shown) to be connected is inserted inside the connection end portion 3a, and the outer periphery of the connection end portion 3a is tightened by the C ring 6 to be connected to the pipe body.

図３は他の実施形態を示すエルボ状の管継手の断面図、図４は図３の管継手の一部切欠斜視図である。 FIG. 3 is a sectional view of an elbow-shaped pipe joint showing another embodiment, and FIG. 4 is a partially cutaway perspective view of the pipe joint of FIG.

管継手１１は、略直角に折れ曲がった硬質ＰＶＣにより形成された継手本体１２と、この継手本体２の両端部に設けた２つの接続端部１３ａ，１３ｂを有し、一方の接続端部１３ａはその内周面から外周面に至る全体が軟質ＰＶＣからなる軟質層１４で形成されている。この接続端部１３aには、周方向における相対する２つの位置に軟質層１４の肉厚を切り欠いて形成した薄肉部１５，１５が軸方向に沿って設けられている。図示しない接続すべき樹脂管などの管体が接続端部１３a内側に挿入され、接続端部１３aの外周をＣリング１６により締付けて管体との接続が行なわれる。 The pipe joint 11 has a joint body 12 formed of rigid PVC bent at a substantially right angle, and two connection ends 13a and 13b provided at both ends of the joint body 2, and one connection end 13a is The whole from the inner peripheral surface to the outer peripheral surface is formed of a soft layer 14 made of soft PVC. The connection end portion 13a is provided with thin portions 15, 15 formed by cutting out the thickness of the soft layer 14 at two opposite positions in the circumferential direction along the axial direction. A tube body such as a resin tube (not shown) to be connected is inserted inside the connection end portion 13a, and the outer periphery of the connection end portion 13a is tightened by the C ring 16 to be connected to the tube body.

上記継手本体２，１２と軟質層４，１４は所謂２色射出成形により接合一体化するのが好ましい。すなわち、一次射出成形型(図示せず)で継手本体２，１２を射出成形し、次に二次射出成形型(図示せず)でインサートされている継手本体２，１２に軟質層４，１４を射出成形し融着一体化する。 The joint bodies 2 and 12 and the soft layers 4 and 14 are preferably joined and integrated by so-called two-color injection molding. That is, the joint bodies 2 and 12 are injection molded with a primary injection mold (not shown), and then the soft layers 4 and 14 are inserted into the joint bodies 2 and 12 inserted with a secondary injection mold (not shown). Is molded by injection molding.

上記管継手１を用いて、図５に示すような配管の湾曲部を構成した。すなわち、エアコン本体２０から異方向に配設された複数の配管２１，２２，２３は管継手１、１を介して連結されている。 Using the pipe joint 1, a curved portion of the pipe as shown in FIG. That is, the plurality of pipes 21, 22, 23 arranged in different directions from the air conditioner body 20 are connected via the pipe joints 1, 1.

本発明は上記実施形態に限定されるものでなく、次のような実施形態を含むものである。
(１)管継手はエルボ状に限られず、管体同士を直線的に連結するソケット継手、ニップル継手、分岐部を形成するチーズ継手などにも、本発明を適用できる。
(２)継手本体は硬質ＰＶＣ以外の他の硬質樹脂や他の硬質材料で形成でき、軟質層は軟質ＰＶＣ以外の他の軟質樹脂や他の軟質材料で形成してもよい。
(３)軟質層は一方の接続端部に限らず、他方の接続端部にも形成してもよい。
(４)接続端部の薄肉部は必ず設けなければならないものでなく、また薄肉部を設ける場合には周方向に一箇所でも３以上の複数箇所でもよいほか、その形成位置は任意のものである。
(５)接続端部の外周を締付ける締付部材は必ずしも必要でなく、接続すべき管体を軟質層に密着させて連結してもよいし、接着剤を塗布して管体を軟質層に接着してもよい。
(６)締付部材はＣリングに限らず、バンドなど他の公知の締付部材を使用してもよい。 The present invention is not limited to the above embodiment, and includes the following embodiment.
(1) The pipe joint is not limited to an elbow shape, and the present invention can also be applied to a socket joint, a nipple joint, a cheese joint that forms a branch portion, etc. that linearly connect the pipe bodies.
(2) The joint body can be formed of a hard resin other than hard PVC or other hard materials, and the soft layer may be formed of a soft resin other than soft PVC or other soft materials.
(3) The soft layer may be formed not only on one connection end but also on the other connection end.
(4) The thin portion of the connecting end portion is not necessarily provided, and when the thin portion is provided, it may be one place in the circumferential direction or a plurality of three or more places, and the formation position is arbitrary. is there.
(5) A tightening member for tightening the outer periphery of the connecting end is not necessarily required, and the pipe body to be connected may be brought into close contact with the soft layer and connected, or an adhesive may be applied to the pipe body into the soft layer. It may be glued.
(6) The fastening member is not limited to the C-ring, and other known fastening members such as a band may be used.

本発明におけるエルボ状の管継手の断面図。Sectional drawing of the elbow-shaped pipe joint in this invention. 図１の管継手の一部切り欠き斜視図。FIG. 2 is a partially cutaway perspective view of the pipe joint of FIG. 1. 他の実施形態のエルボ状管継手の断面図。Sectional drawing of the elbow-shaped pipe joint of other embodiment. 図３の管継手の一部切り欠き斜視図。FIG. 4 is a partially cutaway perspective view of the pipe joint of FIG. 3. 本発明の管継手の使用例を示す図。The figure which shows the usage example of the pipe joint of this invention.

符号の説明Explanation of symbols

１、１１管継手
２、１２継手本体
３a、３ｂ、１３a、１３b 接続端部
４、１４軟質層
５，１５薄肉部
６，１６Ｃリング
２０エアコン本体
２１，２２，２３配管
DESCRIPTION OF SYMBOLS 1,11 Pipe joint 2,12 Joint main body 3a, 3b, 13a, 13b Connection end part 4,14 Soft layer 5,15 Thin part 6,16 C ring 20 Air-conditioner main body 21,22,23 Piping

Claims

配管の直管部、湾曲部等を構成する管継手であって、硬質材料により形成された継手本体の少なくとも一方の接続端部の少なくとも内周面に軟質材料よりなる軟質層を形成したことを特徴とする管継手。 A pipe joint constituting a straight pipe part, a curved part, etc. of a pipe, wherein a soft layer made of a soft material is formed on at least an inner peripheral surface of at least one connection end part of a joint body made of a hard material. Characteristic pipe joint.

一方の接続端部の内周面から外周面に至る全体を軟質層に形成した請求項１に記載の管継手。 The pipe joint according to claim 1, wherein the whole of the connecting end portion from the inner peripheral surface to the outer peripheral surface is formed as a soft layer.

接続端部に軸方向に沿って単一または複数の薄肉部を形成し、この接続端部の外周を締付部材により締付けて接続すべき管体を接続するようにした請求項１または２に記載の管継手。 A single or a plurality of thin-walled portions are formed in the connecting end portion along the axial direction, and the outer periphery of the connecting end portion is tightened by a tightening member to connect a tube to be connected. The described pipe joint.

硬質樹脂よりなる継手本体と軟質樹脂よりなる軟質層とを射出成形により融着一体化させて形成した請求項１乃至３のいずれかに記載の管継手。 The pipe joint according to any one of claims 1 to 3, wherein a joint body made of a hard resin and a soft layer made of a soft resin are formed by fusion-bonding by injection molding.