JP2008215364A

JP2008215364A - Pipe joint

Info

Publication number: JP2008215364A
Application number: JP2007038177A
Authority: JP
Inventors: Shoji Okada; 昭司岡田; Masanori Tsukamoto; 政則塚本
Original assignee: TSUKAMOTO KUCHO SETSUBI KK; Kyokuto Kogyo KK
Current assignee: TSUKAMOTO KUCHO SETSUBI KK; Kyokuto Kogyo KK
Priority date: 2007-02-05
Filing date: 2007-02-19
Publication date: 2008-09-18
Anticipated expiration: 2027-02-19
Also published as: JP3938931B1

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint and connection structure of a pipe with excellent sealability and working efficiency. <P>SOLUTION: This pipe joint 10 connects pipes 30 having a flare part 31 with an enlarged inside diameter on an end, and is equipped with a joint body 11 having a seal surface 16 to which the flare part 31 of the pipe 30 is fitted, and a fixing member 20 into which the pipe 30 is inserted and fixed to the joint body 11 to push the flare part 31 to the seal surface 16. An annular groove 17 is annularly formed on the seal surface 16, and annular packing 40 is fitted in the annular groove 17. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、配管用継手に関する。 The present invention relates to a pipe joint.

従来、金属パイプの接続構造として次のようなものがある。金属パイプの先端には内径を広げたフレアー部が形成されており、その金属パイプに袋ナットを挿通させた上で、フレアー部の内面側を配管用継手の継手本体に宛がう。そして、袋ナットを継手本体に締め付けることで、金属パイプのフレアー部を袋ナットと継手本体との間で挟持するものとしている。
特開平０８−２６１３７５号公報特表昭６１−５０２４８２号公報 Conventionally, there are the following metal pipe connection structures. A flare portion with an enlarged inner diameter is formed at the tip of the metal pipe, and a cap nut is inserted through the metal pipe, and the inner surface side of the flare portion is directed to the joint body of the joint for piping. Then, the flared portion of the metal pipe is clamped between the cap nut and the joint body by tightening the cap nut on the joint body.
Japanese Patent Laid-Open No. 08-261375 JP-T 61-502482

このような接続構造においては、金属パイプの径が大きくなると締め付け作業に大変な力を要し、作業工具も大型となるので、接続作業は極めて困難になる。また、金属パイプの材質としては、塑性変形しやすいアルミニウムや軟質銅であることが必要で、鋼や硬質銅では接続が一層困難になり、シール性も十分に確保できなくなるという問題がある。 In such a connection structure, if the diameter of the metal pipe is increased, the tightening operation requires a great force, and the work tool becomes large, so that the connection operation becomes extremely difficult. Further, the material of the metal pipe needs to be aluminum or soft copper which is easily plastically deformed, and connection with steel or hard copper becomes more difficult and there is a problem that sufficient sealing performance cannot be secured.

そこで、この種の接続構造においてシール性を高めるべく、配管用継手とパイプとの間の金属接触部分にゴムパッキン等を挟み付けて密着させることが考えられる。しかしながら、このようにパッキン等を挟み付ける構造としたとしても、パッキンの位置を保持できる構造にはなっていないため、袋ナットの締め付け作業の際にパッキンを常にパイプと同心に保持しつつ締め付けてゆくことは極めて困難である。このため、パッキンがパイプに対して偏心してしまい、所期のシール性が得られないという問題がある。また、パッキンの形状としては、単にＯリングを介在させるのみではシール性が十分でなく、フレアー部に好適な形状を備えたパッキンが望まれる。また、金属パイプの内外に接着剤を塗布しておくことも考えられるが、そうすると、袋ナットを締め付けてゆくに従い、塗布された接着剤が絞られるようにして継手本体内に流れ落ちることがある。すると、固まった接着剤がパイプ内を流れる液体に混入することがあり、例えば冷媒配管の場合には冷媒の流れに乗じてコンプレッサに吸引され、時にはコンプレッサを破損させてしまうことがある。 Therefore, in order to improve the sealing performance in this type of connection structure, it is conceivable to attach rubber packing or the like to the metal contact portion between the piping joint and the pipe so as to be in close contact with each other. However, even if the structure such as packing is sandwiched in this way, it is not structured to hold the packing position. It is extremely difficult to go. For this reason, there is a problem that the packing is eccentric with respect to the pipe and the desired sealing performance cannot be obtained. Moreover, as the shape of the packing, simply by interposing an O-ring does not provide sufficient sealing performance, and a packing having a suitable shape for the flare portion is desired. It is also conceivable to apply an adhesive to the inside and outside of the metal pipe. However, as the cap nut is tightened, the applied adhesive may flow down into the joint body so that the applied adhesive is squeezed. Then, the hardened adhesive may be mixed into the liquid flowing in the pipe. For example, in the case of a refrigerant pipe, the refrigerant flows and is sucked by the compressor, and sometimes the compressor is damaged.

本発明は上記事情に鑑みてなされたものであって、シール性かつ作業性に優れる配管用継手およびパイプの接続構造を提供することを目的とするものである。 This invention is made | formed in view of the said situation, Comprising: It aims at providing the joint for piping and the connection structure of a pipe which are excellent in a sealing performance and workability | operativity.

上記課題を解決するために、本発明の配管用継手は、先端に内径を広げたフレアー部を有するパイプ同士を接続するための配管用継手であって、前記パイプの前記フレアー部が宛がわれるシール面を備える継手本体と、前記パイプを内部に挿通させるとともに前記継手本体に固定されることで前記フレアー部を前記シール面に押し付ける固定部材とを備え、前記シール面には、前記継手本体の周方向に沿って形成された環状溝部が設けられるとともに、当該環状溝部には環状パッキンが嵌め込まれ、前記環状パッキンは、前記環状溝部に嵌め込まれた状態で、且つ前記フレアー部に宛がわれる前の状態において、前記継手本体の前記シール面から突出する突部を具備するものであり、前記突部は、当該継手本体の先端側から順に、角状に突出してなる第１突部と、曲状に盛り上がってなる第２突部と、角状に突出してなる第３突部と、を備えていることを特徴とする。 In order to solve the above-mentioned problems, the pipe joint of the present invention is a pipe joint for connecting pipes having a flare part with an enlarged inner diameter at the tip, to which the flare part of the pipe is addressed. A joint body provided with a seal surface; and a fixing member that inserts the pipe into the interior and is fixed to the joint body to press the flare portion against the seal surface. An annular groove formed along the circumferential direction is provided, and an annular packing is fitted in the annular groove, and the annular packing is fitted in the annular groove and before being directed to the flare part. In this state, a protrusion protruding from the seal surface of the joint body is provided, and the protrusion protrudes in a square shape in order from the tip side of the joint body. A first projection comprising Te, characterized in that it comprises a second projection formed by raised songs form a third projection formed by protruding prismatic, the.

このような配管用継手によれば、継手本体には、パイプのフレアー部に接触するシール面に対して環状溝部を形成し、当該環状溝部に対して環状パッキンを嵌め込む構成としているため、接続時にはパイプのフレアー部と継手本体のシール面との間に環状パッキンが介在することとなり、当該接続の気密性を高めることが可能となる。
また、特に環状溝部に対して環状パッキンを嵌め込む構成としたため、環状パッキンが継手本体から脱落することなく、接続作業前の継手本体単体に対して環状パッキンを装着しておき、当該継手本体単体のみで市場に流通させる際にも、環状パッキンの脱落を防止することができるようになる。したがって、製造効率や市場流通性を飛躍的に向上させることが可能となる。また、接続作業前においても、接続作業時においても環状パッキンがずれ動くような不具合発生が皆無であり、パイプ接続時には所望の位置に安定して介在させることが可能となる。したがって、パイプ接続時の取り扱いが容易となり、当該接続作業性が飛躍的に向上し、例えば作業中にパイプに対して偏心することも防止される。
さらに、特に環状パッキンは、継手本体のシール面から突出する突部を具備する構成とし、特に継手本体の先端側から順に、角状に突出してなる第１突部と、曲状に盛り上がってなる第２突部と、角状に突出してなる第３突部と、を備えた突部構成としたことで、一層の気密化を図ることが可能とされている。つまり、曲状に突出する第２突部を挟んで両端に形成した第１突部及び第３突部は、角状としたことで接続時の締付け力が逃げ難く（パッキンが変形し難く）、その両端で気密性を確保することができるのである。また、第１突部と第３突部に挟まれた第２突部は、曲状の突部としたことで接続時の締付け力が逃げ易く（パッキンが変形し易く）、当該パッキンを平坦化させる機能を具備することで、確実な締付けを実現し、気密化を図ることが可能となるのである。なお、環状パッキンは例えばゴム等の弾性材料からなる弾性部材により構成することができ、当該構成により一層高い気密性を確保することが可能となる。 According to such a joint for piping, since the annular groove portion is formed on the seal surface that contacts the flare portion of the pipe in the joint body, and the annular packing is fitted into the annular groove portion. Sometimes, an annular packing is interposed between the flare portion of the pipe and the seal surface of the joint body, so that the airtightness of the connection can be improved.
In addition, since the annular packing is particularly fitted into the annular groove, the annular packing is attached to the joint body before connection work without dropping off the joint body, and the joint body alone Even when only circulating in the market, it is possible to prevent the annular packing from falling off. Therefore, it is possible to dramatically improve manufacturing efficiency and market distribution. In addition, there is no problem that the annular packing is displaced before and during the connection work, and the pipe can be stably interposed at a desired position when the pipe is connected. Therefore, handling at the time of pipe connection becomes easy, the connection workability is dramatically improved, and for example, it is prevented that the pipe is eccentric with respect to the work.
Furthermore, especially the annular packing is configured to have a protrusion that protrudes from the sealing surface of the joint body, and in particular, in order from the distal end side of the joint body, a first protrusion that protrudes in a square shape and is raised in a curved shape. By adopting a projecting portion configuration including the second projecting portion and a third projecting portion projecting in a square shape, further airtightness can be achieved. In other words, the first and third protrusions formed at both ends with the second protrusion protruding in a curved shape are square, so that the tightening force at the time of connection is difficult to escape (the packing is difficult to deform). The airtightness can be ensured at both ends. In addition, since the second protrusion sandwiched between the first protrusion and the third protrusion is a curved protrusion, the tightening force at the time of connection is easy to escape (the packing is easily deformed), and the packing is flat. By having the function to make it easier, it is possible to achieve reliable tightening and airtightness. The annular packing can be constituted by an elastic member made of an elastic material such as rubber, and it is possible to ensure higher airtightness by the configuration.

なお、パイプと配管用継手との接続作業を行う場合には、例えば環状パッキンを具備するシール面にパイプのフレアー部を宛がい、予めパイプ側に装着しておいた固定部材を、継手本体に固定する。この時、固定部材によりパイプのフレアー部は環状パッキンを介して継手本体のシール面に強い力で押し付けられ、これによりパイプと配管用継手とが密着される。上記作業中には、環状パッキンは上述したようにシール面とフレアー部との間の正規位置に確実に挟持されることとなる。 When connecting the pipe and the joint for piping, for example, the pipe flare part is applied to the seal surface provided with the annular packing, and the fixing member previously attached to the pipe side is attached to the joint body. Fix it. At this time, the flare portion of the pipe is pressed against the seal surface of the joint body through the annular packing by the fixing member with a strong force, thereby bringing the pipe and the joint for piping into close contact with each other. During the above operation, the annular packing is securely held at the normal position between the seal surface and the flare portion as described above.

前記シール面は、前記継手本体の先端に形成され、当該継手本体の外径を先端に狭めた構成よりなる傾斜面を具備し、前記環状溝部は、前記傾斜面に対して直角方向に切り込まれてなる溝壁面を具備してなるものとすることができる。
このように溝壁面を傾斜面に対して直角方向に切り込んだ態様で形成すると、当該環状溝部内に嵌め込まれる環状パッキンは、傾斜面からなるシール面方向に逃げ難くなり、一層高い気密性を確保することが可能となる。つまり、傾斜面に対して直角をなす溝壁面が、環状パッキンのシール面方向への逃げを抑制する壁となり、当該環状溝部内に環状パッキンを拘束して、十分な気密性が発現されるものとしたのである。 The seal surface includes an inclined surface formed at a distal end of the joint body and having an outer diameter of the joint body narrowed at the distal end, and the annular groove is cut in a direction perpendicular to the inclined surface. It is possible to provide a rare groove wall surface.
When the groove wall surface is formed in such a manner that the groove wall surface is cut in a direction perpendicular to the inclined surface, the annular packing fitted in the annular groove portion does not easily escape in the direction of the seal surface composed of the inclined surface, thereby ensuring higher airtightness. It becomes possible to do. That is, the groove wall surface perpendicular to the inclined surface serves as a wall that suppresses the escape of the annular packing in the seal surface direction, and the annular packing is constrained in the annular groove portion so that sufficient airtightness is expressed. It was.

前記溝壁面は、当該継手本体の先端側と内部側との双方に形成されてなるものとすることができる。
これにより、継手本体の先端側と内部側との双方において、環状パッキンがシール面方向に逃げる事態を防止ないし抑制することが可能となり、さらなる気密性向上に寄与することが可能となる。 The groove wall surface may be formed on both the distal end side and the inner side of the joint body.
As a result, it is possible to prevent or suppress the situation where the annular packing escapes in the seal surface direction on both the distal end side and the inner side of the joint body, thereby contributing to further improvement in airtightness.

前記環状パッキンは、前記溝壁面と面接触する外壁面を具備してなるものとすることができる。
このように、環状パッキンの外壁面が環状溝部の溝壁面に面接触することで、環状パッキンのシール面方向への逃げを効果的に防止でき、一層高い気密性を確保することが可能となる。 The annular packing may include an outer wall surface that is in surface contact with the groove wall surface.
As described above, the outer wall surface of the annular packing is in surface contact with the groove wall surface of the annular groove portion, so that the escape of the annular packing in the seal surface direction can be effectively prevented, and higher airtightness can be secured. .

また、前記環状パッキンは、前記継手本体の先端側と内部側との双方に形成された各溝壁面に対して各々面接触する２つの外壁面を具備してなるものとすることができる。
このように、環状パッキンの両外壁面が環状溝部の両溝壁面に面接触することで、環状パッキンのシール面方向への逃げを効果的に防止でき、一層高い気密性を確保することが可能となる。 The annular packing may include two outer wall surfaces that are in surface contact with each groove wall surface formed on both the tip side and the inner side of the joint body.
In this way, both the outer wall surfaces of the annular packing are in surface contact with both groove wall surfaces of the annular groove portion, so that the escape of the annular packing in the seal surface direction can be effectively prevented, and higher airtightness can be secured. It becomes.

前記環状パッキンは、前記環状溝部に嵌め込まれた状態で、前記環状溝部の溝底面との間にクリアランスを形成するための逃げ部を備え、前記逃げ部は、前記第１突部と前記第３突部の裏側に形成されてなるものとすることができる。
環状パッキンの第１突部と第３突部の裏側にそれぞれ逃げ部を形成し、当該第１突部と第３突部の裏側にクリアランスを形成することで、気密性を更に向上させることが可能となる。つまり、第１突部と第３突部は角状の突部であることから変形し難くいため、パッキン自身が溝部の内側に押圧されることとなるが、本発明のように第１突部と第３突部の裏側にクリアランスを設けることで、接続時において締付け力の押圧に対応してクリアランス側へのパッキンの移動が許容され、その結果、パッキンがシール面から突出し過ぎることによる気密性低下を防止ないし抑制することが可能となったのである。
なお、前記逃げ部は、当該環状パッキンの裏面側角部に形成されたアール面取り又は角面取りとして構成することができる。 The annular packing includes a relief portion for forming a clearance between the annular groove portion and a groove bottom surface of the annular groove portion, and the relief portion includes the first protrusion and the third protrusion. It can be formed on the back side of the protrusion.
By forming relief portions on the back sides of the first and third projections of the annular packing and forming clearances on the back sides of the first and third projections, the airtightness can be further improved. It becomes possible. That is, since the first protrusion and the third protrusion are not easily deformed because they are square-shaped protrusions, the packing itself is pressed inside the groove, but the first protrusion as in the present invention. By providing a clearance on the back side of the third protrusion, the packing is allowed to move to the clearance side in response to the pressing force of the tightening force at the time of connection, and as a result, airtightness due to the packing protruding too far from the sealing surface It became possible to prevent or suppress the decrease.
In addition, the said relief part can be comprised as a rounded chamfering or a square chamfering formed in the corner | angular part of the back surface side of the said annular packing.

また、前記環状溝部の溝底面からの前記第１突部の高さｈ１、前記第２突部の高さｈ２、及び前記第３突部の高さｈ３は、それぞれｈ１＜ｈ２＜ｈ３の関係を有するものとすることができる。
このような構成により、配管接続時において当該継手本体の後端側の突部（第３突部）から順にフレー部に宛がうことが可能となる。その結果、締付けに応じて徐々に継手本体の先端側の突部（第２突部、第１突部）を宛がい、確実な気密性を確保することが可能となるのである。 In addition, the height h1 of the first protrusion, the height h2 of the second protrusion, and the height h3 of the third protrusion from the groove bottom surface of the annular groove portion have a relationship of h1 <h2 <h3, respectively. It can have.
With such a configuration, it is possible to reach the frame portion in order from the protrusion (third protrusion) on the rear end side of the joint body at the time of pipe connection. As a result, the protrusions (second protrusions, first protrusions) on the distal end side of the joint main body are gradually addressed according to the tightening, and it is possible to ensure reliable airtightness.

本発明によると、シール性かつ作業性に優れる配管用継手およびパイプの接続構造を提供することが可能となる。 ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the joint for piping and the connection structure of a pipe which are excellent in sealing performance and workability | operativity.

＜第１実施形態＞
以下、本発明を具体化した第１実施形態について図１ないし図５を参照して説明する。
図１は本実施形態の配管用継手およびパイプの接続構造の正面図、図２は同じく本実施形態の配管用継手およびパイプの接続構造の軸断面図、図３は配管用継手について一部を断面で示す正面図、図４は配管用継手の要部を示す拡大断面図、図５は配管用継手に装着される環状パッキンの断面構成を示す拡大断面図である。 <First Embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a front view of a pipe joint and pipe connection structure according to the present embodiment, FIG. 2 is an axial sectional view of the pipe joint and pipe connection structure according to the present embodiment, and FIG. FIG. 4 is an enlarged sectional view showing a main part of the joint for piping, and FIG. 5 is an enlarged sectional view showing a sectional configuration of the annular packing attached to the joint for piping.

図１及び図２に示すように、本実施形態に係る配管用継手１０は、例えば鉄等の金属材料にて形成されており、先端に内径を広げたフレアー部３１を有する２本の同径のパイプ３０を同軸状に連結させる継手本体１１と、これら連結されたパイプ３０をそれぞれ継手本体１１に固定する一対の固定部材２０とからなる。 As shown in FIGS. 1 and 2, the piping joint 10 according to the present embodiment is formed of a metal material such as iron, for example, and has the same two diameters having a flare portion 31 having an enlarged inner diameter at the tip. The joint main body 11 that connects the pipes 30 coaxially and a pair of fixing members 20 that fix the connected pipes 30 to the joint main body 11 respectively.

継手本体１１は筒状をなし、長さ方向の中央部分の周壁は断面の外形が六角形の肉厚部１２とされているとともに、この肉厚部１２の両側の周壁は後述する固定部材２０が固定される被固定部１３とされている。この被固定部１３の外面には、固定部材２０のねじ部２２と螺合するためのねじ溝１４が形成されている。また、継手本体１１の被固定部１３よりさらに端部側（両端部側）には、それぞれ連結されるパイプ３０のフレアー部３１を宛がうためのシール面１６が形成されており、具体的には当該継手本体１１の被固定部１３から先端側にむかって狭まる傾斜面状をなすシール面１６とされている。 The joint body 11 has a cylindrical shape, and the peripheral wall of the central portion in the length direction is a thick section 12 having a hexagonal cross section, and the peripheral walls on both sides of the thick section 12 are fixing members 20 described later. Is a fixed portion 13 to be fixed. On the outer surface of the fixed portion 13, a screw groove 14 is formed for screwing with the screw portion 22 of the fixing member 20. Further, a sealing surface 16 is formed on the end side (both ends) of the joint body 11 so as to address the flare 31 of the pipe 30 to be connected. The seal body 16 has an inclined surface shape that narrows from the fixed portion 13 of the joint body 11 toward the distal end side.

また、継手本体１１の先端側に形成されたシール面１６には、図３及び図４に示すように周方向に沿って構成された環状の溝部１７が形成され、当該溝部１７には環状パッキン４０が嵌め込まれている。なお、環状パッキン４０の厚さ（高さ）は、溝部１７から少なくとも一部が突出するように構成されている。 Further, the seal surface 16 formed on the distal end side of the joint body 11 is formed with an annular groove portion 17 configured along the circumferential direction as shown in FIGS. 3 and 4, and the groove portion 17 has an annular packing. 40 is fitted. In addition, the thickness (height) of the annular packing 40 is configured such that at least a part thereof protrudes from the groove portion 17.

溝部１７は、図４に示すように、パイプ１３のシール面１６に対して直角方向に凹んだ形状とされ、底面１７ｃと、この底面１７ｃから立ち上がる壁面（溝壁面）１７ａ，１７ｂとを具備して構成されている。つまり、壁面１７ａ，１７ｂは、シール面１６に対して直角をなす面として構成されているのである。また、溝部１７を当該継手本体１１の先端側及び内部側において取り囲むように壁部（突部）１６ａ及び壁部（突部）１６ｂが形成され、これら壁部１６ａ，１６ｂと環状パッキン４０とによりフレアー部３１に対する当接面が構成される。なお、先端側の壁部１６ａにより、溝部１７からの環状パッキン４０の先端側への抜けが好適に防止されている。 As shown in FIG. 4, the groove portion 17 has a shape recessed in a direction perpendicular to the seal surface 16 of the pipe 13, and includes a bottom surface 17c and wall surfaces (groove wall surfaces) 17a and 17b rising from the bottom surface 17c. Configured. That is, the wall surfaces 17 a and 17 b are configured as surfaces that are perpendicular to the seal surface 16. Further, a wall (projection) 16 a and a wall (projection) 16 b are formed so as to surround the groove portion 17 at the distal end side and the inner side of the joint body 11, and the wall portions 16 a and 16 b and the annular packing 40 A contact surface with respect to the flare portion 31 is formed. Note that the annular packing 40 from the groove 17 to the distal end side is suitably prevented by the distal end side wall portion 16a.

また、環状パッキン４０は弾性材料からなる弾性部材であって、例えば極性、飽和エラストマーに属する過酸化物加硫された水素添加ニトリルゴムを環状に成形したものを用いている。当該水素添加ニトリルゴムは引張強さ、引張破断点伸び、耐磨耗性などの機械的特性に優れ、飽和構造を具備するため、使用温度範囲は−２５℃から＋１５０℃程度（短時間であれば＋１７０℃まで可）とされ、また耐オゾン性、耐候性、耐老化性にも極めて優れている。さらに、鉱油中での膨潤性が非常に小さく、添加剤の多い油との適合性にも優れている。 The annular packing 40 is an elastic member made of an elastic material, and for example, a ring-shaped hydrogenated nitrile rubber vulcanized with peroxide belonging to a polar, saturated elastomer is used. The hydrogenated nitrile rubber is excellent in mechanical properties such as tensile strength, elongation at break at break and abrasion resistance, and has a saturated structure. Therefore, the operating temperature range is about −25 ° C. to + 150 ° C. Up to + 170 ° C.) and is extremely excellent in ozone resistance, weather resistance and aging resistance. Furthermore, the swelling property in mineral oil is very small, and the compatibility with oils with many additives is also excellent.

環状パッキン４０は、図５に示すように、溝部１７に嵌め込まれた状態で、且つフレアー部３１に宛がわれる前の状態において、継手本体１１のシール面１６から突出する突部４０ａ（第１突部），４０ｂ（第３突部），４０ｃ（第２突部）を備えている。これら突部４０ａ，４０ｂ，４０ｃは、環状パッキン４０を相対的に厚肉に構成した厚肉部により形成されている。 As shown in FIG. 5, the annular packing 40 is in a state of being fitted into the groove portion 17 and before being directed to the flare portion 31. Projections), 40b (third projections), and 40c (second projections). These protrusions 40a, 40b, and 40c are formed by thick portions that are formed by making the annular packing 40 relatively thick.

突部４０ａ，４０ｂ，４０ｃのうち、環状パッキン４０の幅方向（継手前後方向）両端に位置する第１突部４０ａ，第３突部４０ｂは角状に突出してなる一方、環状パッキン４０の幅方向（前後方向）中央部に位置する第２突部４０ｃは曲状に突出してなるものである。また、突部４０ａ，４０ｂと突部４０ｃとの間には、これら突部に比して相対的に凹んでなる均し用凹部４０ｄ，４０ｅがそれぞれ形成されている。なお、均し用凹部４０ｄ，４０ｅは、環状パッキン４０を相対的に薄肉に構成した薄肉部により形成されている。また、第１突部４０ａと第３突部４０ｂの裏側には角面取り（アール面取りであってもよい）４０ｆ，４０ｇが形成されている。 Among the protrusions 40a, 40b, and 40c, the first protrusions 40a and the third protrusions 40b that are located at both ends in the width direction (the joint front-rear direction) of the annular packing 40 project in a square shape, while the width of the annular packing 40 The 2nd protrusion 40c located in the direction (front-back direction) center part protrudes in the shape of a curve. Further, leveling recesses 40d and 40e are formed between the protrusions 40a and 40b and the protrusion 40c, respectively, which are relatively recessed compared to the protrusions. The leveling recesses 40d and 40e are formed by thin portions in which the annular packing 40 is relatively thin. In addition, corner chamfers (may be round chamfers) 40f and 40g are formed on the back side of the first protrusion 40a and the third protrusion 40b.

そして、図１６に示すように、第１突部４０ａ、第２突部４０ｃ、及び第３突部４０ｂの環状溝部１７の溝底面１７ｃからの高さｈ１、ｈ２、ｈ３は、それぞれｈ１＜ｈ２＜ｈ３の関係を有し、本実施形態ではｈ１＝１．１３ｍｍ、ｈ２＝１．１８ｍｍ、ｈ３＝１．２２ｍｍとなっている。また、フレアー部３１を宛がう第１突部４０ａ、第２突部４０ｃ、及び第３突部４０ｂの頂部で形成される宛面は、環状溝部１７の溝底面１７ｃに対して若干傾斜をなしている。つまり、継手本体１１の軸線方向に直交する軸断面に対する環状溝部１７の溝底面１７ｃがなす角度θ１が４５°であるのに対し、宛面が軸断面に対してなす角度θ２は４２°．４５'とされている。このような構成により、接続時において当該継手本体１１の後端側（内側）の突部（つまり第３突部４０ｂ）から順にフレアー部３１に宛がうことが可能となる。その結果、締付けに応じて徐々に継手本体１１の先端側の突部（第２突部４０ｃ、第１突部４０ａ）を宛がい、確実な気密性を確保している。 As shown in FIG. 16, the heights h1, h2, and h3 from the groove bottom surface 17c of the annular groove 17 of the first protrusion 40a, the second protrusion 40c, and the third protrusion 40b are h1 <h2, respectively. <H3 is satisfied, and in this embodiment, h1 = 1.13 mm, h2 = 1.18 mm, and h3 = 1.22 mm. Further, the destination surfaces formed at the tops of the first protrusion 40 a, the second protrusion 40 c, and the third protrusion 40 b that address the flare portion 31 are slightly inclined with respect to the groove bottom surface 17 c of the annular groove portion 17. There is no. That is, the angle θ1 formed by the groove bottom surface 17c of the annular groove portion 17 with respect to the axial cross section orthogonal to the axial direction of the joint body 11 is 45 °, whereas the angle θ2 formed by the destination surface with respect to the axial cross section is 42 °. 45 '. With such a configuration, it is possible to address the flare 31 in order from the rear end (inner side) protrusion (that is, the third protrusion 40b) of the joint body 11 at the time of connection. As a result, the protrusions (second protrusion 40c, first protrusion 40a) on the distal end side of the joint body 11 are gradually addressed according to the tightening to ensure reliable airtightness.

一方、固定部材２０もパイプ３０が挿通可能な筒状をなしており、その一端側は断面の外形が六角形の固定部２１とされているとともに、その内面側には上述した被固定部１３のねじ溝１４と螺合するためのねじ部２２が形成されている。また、他端側は、内面がパイプ３０の外周側に嵌合する径に形成されているとともに、内面に沿って環状の溝部２３が形成されたガイド部２４とされている。さらに、固定部２１とガイド部２４との内面側の境界はガイド部２４側にむかって狭まる傾斜面状に形成されており、パイプ３０のフレアー部３１をシール面１６に押し付けるための押圧部２５とされている。 On the other hand, the fixing member 20 also has a cylindrical shape into which the pipe 30 can be inserted. The fixing member 20 has a hexagonal fixing section 21 at one end, and the above-described fixed section 13 on the inner surface side. A screw portion 22 is formed for screwing with the screw groove 14. Further, the other end side is formed as a guide portion 24 in which an inner surface is formed with a diameter that fits to the outer peripheral side of the pipe 30 and an annular groove portion 23 is formed along the inner surface. Further, the boundary on the inner surface side of the fixed portion 21 and the guide portion 24 is formed in an inclined surface shape that narrows toward the guide portion 24 side, and a pressing portion 25 for pressing the flare portion 31 of the pipe 30 against the seal surface 16. It is said that.

次に、このような配管用継手１０を用いて例えば２本のパイプ３０を接続する方法について説明する。
まず、一方のパイプ３０を配管用継手１０の固定部材２０に挿通させる。この状態で、環状パッキン４０を具備するシール面１６とパイプ３０のフレアー部３１とを宛がいつつ、パイプ３０側に装着した上記固定部材２０を継手本体１１に固定する。この時、環状パッキン４０はその位置を溝部１７によって保持されているから、嵌合作業中に偏心して配管内にずれ動いてしまうことはない。 Next, a method of connecting, for example, two pipes 30 using such a pipe joint 10 will be described.
First, one pipe 30 is inserted through the fixing member 20 of the joint 10 for piping. In this state, the fixing member 20 mounted on the pipe 30 side is fixed to the joint body 11 while the sealing surface 16 including the annular packing 40 and the flare portion 31 of the pipe 30 are addressed. At this time, since the position of the annular packing 40 is held by the groove portion 17, the annular packing 40 is not decentered during the fitting operation and does not shift into the pipe.

固定部材２０と継手本体１１との固定は、まずパイプ３０に装着されている固定部材２０をそのガイド部２４によって正規姿勢に保ちつつ継手本体１１側に移動させ、ねじ部２２を被固定部１３のねじ溝１４内にねじ込む。ねじ部２２がねじ溝１４の奥方までねじ込まれると、やがて固定部材２０の押圧部２５がパイプ３０のフレアー部３１に当接し、さらに固定部材２０がねじ込まれることにより、フレアー部３１が押圧部２５によってシール面１６に強く押し付けられるとともに、継手本体１１がパイプ３０にしっかりと固定される。この時、フレアー部３１とシール面１６との間には環状パッキン４０が介在しており、この環状パッキン４０が両者に押し潰された状態となるので、継手本体１１とパイプ３０とは高いシール性を保つように接続される。
また、他方側のパイプ３０も、上記と同様の手順で配管用継手１０と接続する。 The fixing member 20 and the joint main body 11 are fixed by first moving the fixing member 20 attached to the pipe 30 to the joint main body 11 side while maintaining the normal posture by the guide portion 24, and the screw portion 22 is fixed to the fixed portion 13. Screwed into the screw groove 14. When the screw portion 22 is screwed into the depth of the screw groove 14, the pressing portion 25 of the fixing member 20 eventually comes into contact with the flare portion 31 of the pipe 30, and further the fixing member 20 is screwed, whereby the flare portion 31 is pressed into the pressing portion 25. As a result, the joint body 11 is firmly fixed to the pipe 30. At this time, an annular packing 40 is interposed between the flare portion 31 and the seal surface 16, and the annular packing 40 is crushed by both, so that the joint body 11 and the pipe 30 are highly sealed. Connected to keep sex.
Further, the pipe 30 on the other side is also connected to the piping joint 10 in the same procedure as described above.

ここで、パイプ３０のフレアー部３１を被固定部１３のシール面１６に押し付ける前においては、図１４に示すように、環状溝部１７に対して環状パッキン４０が嵌め込まれた状態で固定される。このとき、環状パッキン４０の裏面側には角面取り４０ｆ，４０ｇが形成されているため、当該環状パッキン４０と環状溝部１７の底面１７ｃとの間にはクリアランスＣが形成される。また、環状パッキン４０は、環状溝部１７の溝壁面１７ａ，１７ｂと面接触する外壁面４０ｈ，４０ｉを備えている。 Here, before the flare portion 31 of the pipe 30 is pressed against the seal surface 16 of the fixed portion 13, as shown in FIG. 14, the annular packing 40 is fixed in a state of being fitted into the annular groove portion 17. At this time, since the chamfers 40 f and 40 g are formed on the back surface side of the annular packing 40, a clearance C is formed between the annular packing 40 and the bottom surface 17 c of the annular groove portion 17. The annular packing 40 includes outer wall surfaces 40 h and 40 i that are in surface contact with the groove wall surfaces 17 a and 17 b of the annular groove portion 17.

そして、図１４の状態から、パイプ３０のフレアー部３１を被固定部１３のシール面１６に押し付けることで、図１５に示すように環状パッキン４０が弾性変形し、具体的には各突部４０ａ，４０ｂ，４０ｃが弾性変形するとともに、クリアランスＣが環状パッキン４０で充填される態様にて気密が確保される。特に、本実施形態では、環状パッキン４０が、継手本体１１のシール面１６から突出する突部４０ａ，４０ｂ，４０ｃを具備する構成とし、継手本体１１の先端側から順に、角状に突出してなる第１突部４０ａと、曲状に盛り上がってなる第２突部４０ｃと、角状に突出してなる第３突部４０ｂと、を備えた突部構成としたことで、一層の気密化が図られている。 Then, the annular packing 40 is elastically deformed as shown in FIG. 15 by pressing the flare portion 31 of the pipe 30 against the sealing surface 16 of the fixed portion 13 from the state of FIG. , 40b, 40c are elastically deformed, and airtightness is secured in such a manner that the clearance C is filled with the annular packing 40. In particular, in the present embodiment, the annular packing 40 includes protrusions 40 a, 40 b, and 40 c that protrude from the seal surface 16 of the joint body 11, and protrudes in a square shape sequentially from the distal end side of the joint body 11. By adopting a protrusion configuration including the first protrusion 40a, the second protrusion 40c that bulges in a curved shape, and the third protrusion 40b that protrudes in a square shape, further airtightness is achieved. It has been.

つまり、曲状に突出する第２突部４０ｃを挟んで両端に形成した第１突部４０ａ及び第３突部４０ｂを、角状の突部としたことで接続時の締付け力が逃げ難く（パッキン４０が変形し難く）、その両端で気密性を確保することができるのである。また、第１突部４０ａと第３突部４０ｂに挟まれた第２突部４０ｃは、曲状の突部としたことで接続時の締付け力が逃げ易く（パッキン４０が変形し易く）、当該第２突部４０ｃにおいてパッキン４０を平坦化させることが可能となり、それに基づいて確実な締付けを実現し、気密化を図ることが可能となるのである。なお、接続時（締付け時）の環状パッキン４０の厚さ変形に対しては、均し用凹部４０ｄ，４０ｅも寄与しており、例えば第２突部４０ｃが潰れる方向に変形した際には、当該均し用凹部４０ｄ，４０ｅが追随して盛り上がる方向（厚さを均す方向）に変形することとなる。 In other words, the first projecting portion 40a and the third projecting portion 40b formed at both ends with the second projecting portion 40c projecting in a curved shape sandwiched by the angular projecting portions makes it difficult for the tightening force at the time of connection to escape ( The packing 40 is not easily deformed), and airtightness can be secured at both ends thereof. Further, the second protrusion 40c sandwiched between the first protrusion 40a and the third protrusion 40b is a curved protrusion, so that the tightening force at the time of connection is easy to escape (the packing 40 is easy to deform), The packing 40 can be flattened at the second protrusion 40c, and reliable tightening can be realized based on the packing 40, thereby achieving airtightness. In addition, for the thickness deformation of the annular packing 40 at the time of connection (tightening), the leveling recesses 40d and 40e also contribute, for example, when the second protrusion 40c is deformed in a direction to be crushed, The leveling recesses 40d and 40e follow and are deformed in a rising direction (thickness leveling direction).

このように、本実施形態の配管用継手１０によれば、環状パッキン４０を継手本体１１のシール面１６の溝部１７に埋め込んだ状態で、当該シール面１６とパイプ３０のフレアー部３１とを宛がいつつ、固定部材２０を継手本体１１に固定するという簡単な作業を行うだけで、シール性に優れたパイプの接続構造を得ることができる。しかも、環状パッキン４０の脱落もないため、接続作業性が極めて容易で、ひいては接続安定性に加えてコスト削減（人件費削減）にも寄与することが可能となる。 Thus, according to the piping joint 10 of the present embodiment, the seal surface 16 and the flare portion 31 of the pipe 30 are addressed in a state where the annular packing 40 is embedded in the groove portion 17 of the seal surface 16 of the joint body 11. In spite of this, a pipe connection structure having an excellent sealing property can be obtained only by performing a simple operation of fixing the fixing member 20 to the joint body 11. In addition, since the annular packing 40 does not fall off, the connection workability is extremely easy, and it is possible to contribute to cost reduction (labor cost reduction) in addition to connection stability.

＜第２実施形態＞
第２実施形態の配管用継手およびパイプの接続構造を図６及び図７に示す。本実施形態の配管用継手１０は、上記第１実施形態と同様の構成のものであるが、固定部材２０とパイプ３０との間に接着剤５０を使用したところが上記実施形態のパイプの接続構造とは異なる。 Second Embodiment
FIG. 6 and FIG. 7 show a pipe joint and pipe connection structure according to the second embodiment. The piping joint 10 of the present embodiment has the same configuration as that of the first embodiment, but the adhesive connection 50 is used between the fixing member 20 and the pipe 30 to connect the pipe according to the above embodiment. Is different.

本実施形態において２本のパイプ３０を接続する場合には、まず、一方のパイプ３０を配管用継手１０の固定部材２０に挿通した状態とするとともに、例えば、嫌気性接着剤や耐熱性エポキシ系接着剤等の接着剤５０を、パイプ３０の先端付近において外周面の一部に塗布する（図６参照）。この状態で、環状パッキン４０を備える継手本体１１のシール面１６を、パイプ３０のフレアー部３１に宛がいつつ、固定部材２０と継手本体１１とを螺合により締付け固定すると、パイプ３０の端部付近に塗布された接着剤５０は、固定部材２０のねじ部２２を継手本体１１のねじ溝１４内にねじ込む時にガイド部２４の内面によって押し広げられるとともに、毛細管現象により溝部２３内にほぼ隙間なく充填される。これにより、固定部材２０とパイプ３０とは強固に接着固定される。 When two pipes 30 are connected in the present embodiment, first, one pipe 30 is inserted into the fixing member 20 of the piping joint 10 and, for example, an anaerobic adhesive or a heat-resistant epoxy system is used. An adhesive 50 such as an adhesive is applied to a part of the outer peripheral surface near the tip of the pipe 30 (see FIG. 6). In this state, when the fixing member 20 and the joint body 11 are screwed together and fixed while the sealing surface 16 of the joint body 11 provided with the annular packing 40 is directed to the flare portion 31 of the pipe 30, the end of the pipe 30 The adhesive 50 applied in the vicinity is pushed and spread by the inner surface of the guide portion 24 when the screw portion 22 of the fixing member 20 is screwed into the screw groove 14 of the joint body 11, and there is almost no gap in the groove portion 23 due to capillary action. Filled. Thereby, the fixing member 20 and the pipe 30 are firmly bonded and fixed.

このように、本実施形態によっても、簡単な作業を行うだけで、シール性に優れたパイプの接続構造を得ることができる。また、接着剤５０を用いたことにより、接続強度を一層高めることが可能となる。 As described above, according to the present embodiment, a pipe connection structure having excellent sealing performance can be obtained only by performing a simple operation. Further, by using the adhesive 50, the connection strength can be further increased.

＜第３実施形態＞
第３実施形態のパイプ接続構造の断面図を、図８ないし図１１に示す。
本実施形態の配管用継手６０も、２本の同径の筒状のパイプ３０を同軸状に接続するものであるが、上記実施形態の固定構造を変化させたものである。 <Third Embodiment>
Sectional views of the pipe connection structure of the third embodiment are shown in FIGS.
The piping joint 60 of the present embodiment is also one in which two cylindrical pipes 30 having the same diameter are connected coaxially, but the fixing structure of the above embodiment is changed.

配管用継手６０は、上記実施形態の配管用継手１０と同様に、例えば鉄等の金属材料にて形成されており、２本のパイプ３０を連結させる継手本体６１と、これらのパイプ３０をそれぞれ継手本体６１に締め付け固定する一対の固定部材７０とからなる。継手本体６１は筒状をなすとともに、その長さ方向の中央部分には径方向に突出する肉厚のフランジ部６２が形成されており、このフランジ部６２に後述する固定ねじ８０がねじ込まれる孔６３が等間隔に６つ形成されている。また、継手本体６１の両端部側には、環状パッキン４０を溝部（図示略）に嵌め込んでなるシール面６６が形成されている。つまり、フランジ部６２の基部付近には先端側に向かって縮径された傾斜面が形成されており、パイプ３０のフレアー部３１を宛がうためのシール面６６とされている。 Similar to the pipe joint 10 of the above embodiment, the pipe joint 60 is formed of a metal material such as iron, for example, and a joint body 61 that connects the two pipes 30 and these pipes 30 respectively. It comprises a pair of fixing members 70 that are fastened and fixed to the joint body 61. The joint body 61 has a cylindrical shape, and a thick flange portion 62 that protrudes in the radial direction is formed at a central portion in the length direction. A hole into which a fixing screw 80 described later is screwed into the flange portion 62. Sixty-three 63 are formed at equal intervals. Further, on both end portions of the joint body 61, seal surfaces 66 are formed by fitting the annular packing 40 into grooves (not shown). That is, an inclined surface having a diameter reduced toward the distal end side is formed in the vicinity of the base portion of the flange portion 62, and serves as a seal surface 66 for addressing the flare portion 31 of the pipe 30.

一方、固定部材７０もパイプ３０が挿通可能な短い筒状をなしており、その一端側には、上述した継手本体６１のフランジ部６２とほぼ同径のフランジ部７１が形成されている。このフランジ部７１には、固定ねじ８０をねじ込むためのねじ孔７２が上記フランジ部６２の孔６３と対応する位置に形成されているとともに、これらねじ孔７２の内面にはねじ溝７３が形成されている。さらに、フランジ部７１側の開口端部は、その内部に挿通されるパイプ３０のフレアー部３１に沿うように傾斜面状に拡開しており、フレアー部３１をシール面６６に押し付けるための押圧部７４とされている。また他端側はガイド部７５とされている。 On the other hand, the fixing member 70 also has a short cylindrical shape through which the pipe 30 can be inserted, and a flange portion 71 having substantially the same diameter as the flange portion 62 of the joint body 61 described above is formed on one end side thereof. A screw hole 72 for screwing the fixing screw 80 is formed in the flange portion 71 at a position corresponding to the hole 63 of the flange portion 62, and a screw groove 73 is formed on the inner surface of the screw hole 72. ing. Further, the opening end portion on the flange portion 71 side is expanded in an inclined surface shape along the flare portion 31 of the pipe 30 inserted into the flange portion 71, and a pressure for pressing the flare portion 31 against the seal surface 66. Part 74 is designated. The other end is a guide portion 75.

本実施形態の配管用継手６０は以上のような構成であり、次に、このような配管用継手６０を用いて２本のパイプ３０を接続する方法について述べる。
まず、パイプ３０を配管用継手６０の固定部材７０に挿通した状態とし、パイプ３０のフレアー部３１が環状パッキン４０を含む継手本体６１のシール面６６に宛がわれる位置まで移動させる。そして、パイプ３０に装着されている固定部材７０をガイド部７５によって正規姿勢に保ちつつ継手本体６１側に移動させ、６本の固定ねじ８０をそれぞれ固定部材７０のねじ孔７２および継手本体６１の孔６３内に均等な力でねじ込むことにより、フレアー部３１を押圧部７４によってシール面６６に強く押し付けるとともに、パイプ３０と継手本体６１とをしっかりと固定した状態とする。この時、固定部材７０はガイド部７５によって常時正規姿勢に保持されるから、固定ねじ８０を均等にねじ込む作業を容易に行うことができる。また、フレアー部３１とシール面６６との間には環状パッキン４０が介在しており、この環状パッキン４０が両者に押し潰された状態となるので、継手本体６１とパイプ３０とは高いシール性を保つように接続される。 The piping joint 60 of the present embodiment is configured as described above. Next, a method of connecting two pipes 30 using such a piping joint 60 will be described.
First, the pipe 30 is inserted into the fixing member 70 of the piping joint 60 and moved to a position where the flare portion 31 of the pipe 30 is addressed to the seal surface 66 of the joint body 61 including the annular packing 40. Then, the fixing member 70 attached to the pipe 30 is moved to the joint main body 61 side while maintaining the normal posture by the guide portion 75, and the six fixing screws 80 are respectively connected to the screw holes 72 of the fixing member 70 and the joint main body 61. By screwing into the hole 63 with an equal force, the flare 31 is strongly pressed against the seal surface 66 by the pressing portion 74 and the pipe 30 and the joint body 61 are firmly fixed. At this time, since the fixing member 70 is always held in the normal posture by the guide portion 75, the operation of screwing the fixing screw 80 evenly can be easily performed. Further, an annular packing 40 is interposed between the flare portion 31 and the seal surface 66, and the annular packing 40 is crushed by both, so that the joint body 61 and the pipe 30 have a high sealing performance. To be connected to keep.

＜第４実施形態＞
第４実施形態のパイプ接続構造の正面図及び断面図を図１２及び図１３に示す。
本実施形態の配管用継手６０も、２本の同径の筒状のパイプ３０を同軸状に接続するものであるが、上記実施形態の固定構造を変化させたものである。 <Fourth embodiment>
The front view and sectional drawing of the pipe connection structure of 4th Embodiment are shown in FIG.12 and FIG.13.
The piping joint 60 of the present embodiment is also one in which two cylindrical pipes 30 having the same diameter are connected coaxially, but the fixing structure of the above embodiment is changed.

具体的には、継手本体１１が、パイプ３０の内周側に嵌合する内筒部１５と、この内筒部１５に連続して形成されるとともに内筒部１５より径大に広がってパイプ３０のフレアー部３１が宛われるシール面１６とを備えて構成されている。すなわち、環状パッキン４０を溝部１７に嵌め込んでなるシール面１６よりも先端側に内筒部１５を備え、当該内筒部１５がパイプ３０の内周側に嵌合することでガイドとしての機能を果たしている。 Specifically, the joint body 11 has an inner cylinder portion 15 that is fitted to the inner peripheral side of the pipe 30, and is formed continuously from the inner cylinder portion 15 and has a diameter larger than that of the inner cylinder portion 15, and is piped. And 30 sealing surfaces 16 to which the flare portions 31 are addressed. That is, the inner cylinder part 15 is provided on the tip side of the seal surface 16 formed by fitting the annular packing 40 into the groove part 17, and the inner cylinder part 15 is fitted on the inner peripheral side of the pipe 30 to function as a guide. Plays.

このような内筒部１５を備えることで、フレアー部３１とシール面１６とを宛がう際に、内筒部１５をパイプ３０の内周に挿入してガイドすることが可能となり、接続作業性が極めて簡便なものとなる。また、当該内筒部１５を備える場合には、この内筒部１５の外周面に例えば接着剤を介在させることで、パイプ３０との接続を一層強固なものとすることが可能となる。さらに、内筒部１５を先細り、つまり先端に向かって漸次外径が小さくなる構成としているため、パイプ３０の内周への挿入が容易となり、当該ガイド性が一層高いものとなっている。 By providing such an inner cylinder part 15, it is possible to guide the inner cylinder part 15 by inserting it into the inner periphery of the pipe 30 when the flare part 31 and the seal surface 16 are addressed. The property is extremely simple. When the inner cylinder portion 15 is provided, the connection with the pipe 30 can be further strengthened by interposing, for example, an adhesive on the outer peripheral surface of the inner cylinder portion 15. Furthermore, since the inner cylinder portion 15 is tapered, that is, the outer diameter gradually decreases toward the tip, insertion into the inner periphery of the pipe 30 is facilitated, and the guide property is further enhanced.

＜他の実施形態＞
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれ、さらに、下記以外にも要旨を逸脱しない範囲内で種々変更して実施することができる。 <Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.

（１）上記実施形態では、配管用継手１０，６０を２本の同径の筒状の２本のパイプ３０を同軸状に接続するものとしたが、これに限らず、例えば、金属パイプをタンク等の機器に直接に接続する継手に適用させてもよい。また、径が異なる２種のパイプを互いに接続させる他、継手を曲げて接続させるエルボー管継手に適用できることは勿論である。 (1) In the above-described embodiment, the pipe joints 10 and 60 are connected to the two cylindrical pipes 30 having the same diameter in a coaxial manner. You may make it apply to the coupling connected directly to apparatuses, such as a tank. Of course, the present invention can be applied to an elbow pipe joint in which two types of pipes having different diameters are connected to each other and the joint is bent and connected.

（２）上記実施形態では、先端が斜めに拡開されたフレアー部３１を有するパイプ３０を使用したが、これに限らず、例えば先端のフレアー部が直角に曲がるように開いているパイプや、端部が肉厚に形成されたパイプ等に適用することもできる。 (2) In the above embodiment, the pipe 30 having the flare portion 31 whose tip is widened obliquely is used. However, the present invention is not limited to this, for example, a pipe that is open so that the flare portion at the tip bends at right angles, The present invention can also be applied to a pipe or the like having a thick end portion.

第１実施形態の配管用継手およびパイプの接続構造を示す正面図。The front view which shows the joint for piping of 1st Embodiment, and the connection structure of a pipe. 第１実施形態の配管用継手およびパイプの接続構造を示す軸断面図。The axial sectional view which shows the joint for piping of 1st Embodiment, and the connection structure of a pipe. 配管用継手について一部を断面で示す正面図。The front view which shows a part in cross section about the joint for piping. 配管用継手の要部を示す拡大断面図。The expanded sectional view which shows the principal part of the coupling for piping. 配管用継手に装着される環状パッキンの断面構成を示す拡大断面図。The expanded sectional view which shows the cross-sectional structure of the annular packing with which the coupling for piping is mounted | worn. 第２実施形態の配管用継手とパイプの接続構造を示す正面図。The front view which shows the joint for piping of 2nd Embodiment, and the connection structure of a pipe. 第２実施形態の配管用継手とパイプの接続構造を示す軸断面図。The axis sectional view showing the connection structure of the joint for piping and the pipe of a 2nd embodiment. 第３実施形態の配管用継手とパイプの接続構造を示す正面図。The front view which shows the joint for piping of 3rd Embodiment, and the connection structure of a pipe. 第３実施形態の配管用継手とパイプの接続構造を示す軸断面図。The axial cross section which shows the joint for piping of 3rd Embodiment, and the connection structure of a pipe. 第３実施形態の配管用継手とパイプの接続構造を示す側面図。The side view which shows the joint for piping of 3rd Embodiment, and the connection structure of a pipe. 第３実施形態の配管用継手とパイプの接続完了時の一部拡大断面図。The partially expanded sectional view at the time of the completion of the connection of the coupling for piping of 3rd Embodiment, and a pipe. 第４実施形態の配管用継手とパイプの接続構造を示す正面図。The front view which shows the joint for piping of 4th Embodiment, and the connection structure of a pipe. 第４実施形態の配管用継手とパイプの接続構造を示す軸断面図。The axial sectional view which shows the joint structure for piping of 4th Embodiment, and the connection structure of a pipe. 配管用継手とパイプの接続前の状態を示す説明図。Explanatory drawing which shows the state before the coupling for piping and a pipe are connected. 配管用継手とパイプの接続後の状態を示す説明図。Explanatory drawing which shows the state after the coupling for piping and a pipe are connected. 環状パッキンの寸法関係を示す説明図。Explanatory drawing which shows the dimensional relationship of an annular packing.

Explanation of symbols

１０...配管用継手、１１...継手本体、１６...シール面、１７...溝部、２０...固定部材、３０...パイプ、３１...フレアー部、４０...環状パッキン DESCRIPTION OF SYMBOLS 10 ... Piping joint, 11 ... Joint main body, 16 ... Seal surface, 17 ... Groove part, 20 ... Fixing member, 30 ... Pipe, 31 ... Flare part, 40. ..Ring packing

Claims

It is a joint for piping for connecting pipes having a flare part with an expanded inner diameter at the tip,
A joint body provided with a seal surface to which the flare portion of the pipe is addressed, and a fixing member for inserting the pipe into the interior and fixing the flare portion against the seal surface by being fixed to the joint body,
The seal surface is provided with an annular groove formed along the circumferential direction of the joint body, and an annular packing is fitted into the annular groove,
The annular packing includes a protrusion that protrudes from the seal surface of the joint body in a state in which the annular packing is fitted in the annular groove and before being addressed to the flare portion. Includes, in order from the distal end side of the joint body, a first protrusion that protrudes in a square shape, a second protrusion that bulges in a curved shape, and a third protrusion that protrudes in a rectangular shape. A joint for piping, characterized by

The seal surface is formed at the tip of the joint body, and includes an inclined surface having a configuration in which the outer diameter of the joint body is narrowed at the tip.
The pipe joint according to claim 1, wherein the annular groove portion includes a groove wall surface cut in a direction perpendicular to the inclined surface.

The pipe joint according to claim 2, wherein the groove wall surface is formed on both a tip end side and an inner side of the joint main body.

The pipe joint according to claim 2 or 3, wherein the annular packing includes an outer wall surface in surface contact with the groove wall surface.

4. The annular packing includes two outer wall surfaces that are in surface contact with respective groove wall surfaces formed on both the front end side and the inner side of the joint main body. 5. Pipe fittings.

The annular packing includes a relief portion for forming a clearance between the annular groove portion and a groove bottom surface of the annular groove portion, and the relief portion includes the first protrusion and the third protrusion. The pipe joint according to any one of claims 1 to 5, wherein the pipe joint is formed on a back side of the protrusion.

The pipe joint according to claim 6, wherein the escape portion is a rounded chamfer or a round chamfer formed at a corner on the back surface side of the annular packing.

The height h1 of the first protrusion, the height h2 of the second protrusion, and the height h3 of the third protrusion from the groove bottom surface of the annular groove have a relationship of h1 <h2 <h3, respectively. The joint for pipes according to any one of claims 1 to 7 characterized by things.