JP5296653B2 - Packing and packing installation method - Google Patents

Packing and packing installation method Download PDF

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JP5296653B2
JP5296653B2 JP2009233773A JP2009233773A JP5296653B2 JP 5296653 B2 JP5296653 B2 JP 5296653B2 JP 2009233773 A JP2009233773 A JP 2009233773A JP 2009233773 A JP2009233773 A JP 2009233773A JP 5296653 B2 JP5296653 B2 JP 5296653B2
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packing
branch
packings
pair
pipe
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JP2011080542A (en
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堀川  剛
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Waterworks Technology Development Organization Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide packing which is mounted to a branch case in which a branch section is established between parting planes and can miniaturize its mold, and a mounting method of the packing. <P>SOLUTION: A packing 4, which seals the inside of branch case surrounding fluid pipe, includes a pair of first packings 41 and 43 mounted in a contacting member with the fluid pipe and a pair of second packings 42 and 44 which mutually connects the ends of the first packings 41 and 43 and intervenes between flanges of the branch case, wherein the second packing 42 consists of a circular arc section 42a mounted to the branch section and a connecting section 42b ranging from both ends of the arc section 42a to the first packings 41 and 43, and in a natural condition that external force does not act, the pair of first packings 41 and 43 extends linearly when viewed from a pipe axial direction PD of the fluid pipe, and the arc section 42a is profiled in projection toward the second packing 44. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、流体管を包囲した分岐ケースの内部を密封するパッキンと、そのパッキンを分岐ケースに装着する方法に関する。   The present invention relates to a packing for sealing the inside of a branch case surrounding a fluid pipe, and a method for mounting the packing on the branch case.

かかる分岐ケースとしては、既設の流体管に分岐管を接続する際に使用される割T字管や、流体管の破損により流体が漏洩しているのを補修する場合に使用される補修用金具が知られている。この種の分岐ケースでは、互いにフランジ接続される複数の分割体からなり、パッキンを介して内部を密封可能に構成されたものが一般的である。   Such branch cases include split T-tubes used when connecting branch pipes to existing fluid pipes, and repair fittings used when repairing fluid leakage due to fluid pipe breakage. It has been known. This type of branch case is generally composed of a plurality of divided bodies that are flange-connected to each other and configured to be able to seal the inside through packing.

下記特許文献1には、分岐管の接続に使用される割T字管として、互いにフランジ接続された二つの分割体からなる分岐ケースが記載されている。この分岐ケースに装着されるパッキンは、流体管の外周面に当接する一対の円弧状パッキンと、その円弧状パッキンの端部同士を連結して、分岐ケースのフランジ間に介在する一対のフランジパッキンとを備え、全体として枠型に形成されている。この円弧状パッキンは、流体管の外周面に沿って半円状に湾曲し、フランジパッキンは直線状に延在する。   Patent Document 1 below describes a branch case made of two divided bodies that are flange-connected to each other as a split T-shaped tube used for connecting branch pipes. The packing attached to the branch case includes a pair of arc-shaped packings that contact the outer peripheral surface of the fluid pipe, and a pair of flange packings that are connected between the ends of the arc-shaped packings and between the flanges of the branch case. And is formed in a frame shape as a whole. The arc-shaped packing is bent in a semicircular shape along the outer peripheral surface of the fluid pipe, and the flange packing extends linearly.

ところで、上記の分岐ケースでは、分岐管を接続するための分岐部が分割体の正面に設けられ、分割面に分岐部が干渉しないように設計されているが、近年では、下記特許文献2に記載された割T字管のように、分割体の分割面間に分岐部を設定した分岐ケースが使用されることがある。このような構造の分岐ケースに装着されるパッキンでは、フランジ間に介在するパッキンの一部を、分岐管の外周面に沿って半円状に立ち上がらせる必要がある。   By the way, in said branch case, the branch part for connecting a branch pipe is provided in the front of a division body, and it is designed so that a branch part may not interfere with a division surface. A branch case in which a branch portion is set between the split surfaces of the split body may be used as in the split T-shaped tube described. In the packing attached to the branch case having such a structure, a part of the packing interposed between the flanges needs to rise in a semicircular shape along the outer peripheral surface of the branch pipe.

ところが、そのようなパッキンをモールドで一体的に成型する場合、上述したようにパッキンが立ち上がる部分を有することに起因して、モールドが嵩張って大型化する傾向にあった。特に、分割面間に分岐部を設定した分岐ケースに装着されるパッキンでは、流体管の管径だけでなく分岐管の管径にも対応する必要があり、両者の組み合わせに応じてモールドの種類が多大に増えるため、モールドのコンパクト化を実現できる手法の提案が強く望まれる。   However, when such a packing is integrally formed with a mold, the mold tends to be bulky and large due to having a portion where the packing rises as described above. In particular, in packings installed in a branch case with a branch section between the split surfaces, it is necessary to support not only the pipe diameter of the fluid pipe but also the pipe diameter of the branch pipe. Therefore, a proposal of a method capable of realizing a compact mold is strongly desired.

特開2001−221387号公報JP 2001-221387 A 特開2007−309474号公報JP 2007-309474 A

本発明は上記実情に鑑みてなされたものであり、その目的は、分割面間に分岐部を設定した分岐ケースに装着されるパッキンであって、モールドのコンパクト化を実現できるパッキンと、そのパッキンの装着方法を提供することにある。   The present invention has been made in view of the above circumstances, and an object of the present invention is a packing attached to a branch case in which a branch portion is set between split surfaces, and a packing capable of realizing a compact mold, and the packing It is to provide a mounting method.

上記目的は、下記の如き本発明により達成できる。即ち、本発明に係るパッキンは、互いにフランジ接続される複数の分割体の分割面間に分岐部を設定した分岐ケースに装着され、流体管を包囲した前記分岐ケースの内部を密封するパッキンにおいて、前記流体管との当接部位に装着される一対の第1パッキンと、前記第1パッキンの端部同士を連結し、前記分岐ケースのフランジ間に介在する一対の第2パッキンとを備え、前記第2パッキンの少なくとも片方が、前記分岐部に装着される円弧状の湾曲部と、その湾曲部の両端から前記第1パッキンに連なる連結部とからなり、外力が作用しない自然状態では、前記流体管の管軸方向から見て前記一対の第1パッキンが直線状に延在するとともに、前記第2パッキンの湾曲部が他方の第2パッキンに向かって突き出た形状となるものである。   The above object can be achieved by the present invention as described below. That is, the packing according to the present invention is attached to a branch case in which a branch portion is set between the split surfaces of a plurality of split bodies that are flange-connected to each other, and seals the inside of the branch case surrounding the fluid pipe. A pair of first packings mounted on a contact portion with the fluid pipe; and a pair of second packings connecting ends of the first packings and interposed between flanges of the branch case; In a natural state in which at least one of the second packing includes an arc-shaped curved portion mounted on the branch portion and a connecting portion connected to the first packing from both ends of the curved portion, The pair of first packings extend linearly when viewed from the tube axis direction of the tube, and the curved portion of the second packing protrudes toward the other second packing.

かかる構成のパッキンは、分割面間に分岐部を設定した分岐ケースに装着可能であり、分岐ケースが包囲した流体管の外周面には一対の第1パッキンが当接し、分岐部に接続した分岐管の外周面には、第2パッキンの湾曲部が当接する。それでいて、外力が作用しない自然状態では、流体管の管軸方向から見て第1パッキンが直線状に延在し、第2パッキンの湾曲部が他方の第2パッキンに向かって突き出た形状であることから、このパッキンを成型するためのモールドを嵩張らせずにコンパクトに構成できる。   The packing having such a structure can be attached to a branch case in which a branch portion is set between the split surfaces, and a pair of first packings abut on the outer peripheral surface of the fluid pipe surrounded by the branch case and connected to the branch portion. The curved portion of the second packing is in contact with the outer peripheral surface of the tube. Nevertheless, in a natural state where no external force acts, the first packing extends linearly when viewed from the tube axis direction of the fluid pipe, and the curved portion of the second packing protrudes toward the other second packing. Therefore, the mold for molding the packing can be made compact without being bulky.

本発明のパッキンでは、前記一対の第1パッキン及び前記第2パッキンの湾曲部が、前記分岐ケースとの接触面とその反対側の面とに、複数の凸部が幅方向に並設されているものが好ましい。   In the packing according to the present invention, the curved portions of the pair of first packing and the second packing have a plurality of convex portions arranged in parallel in the width direction on the contact surface with the branch case and the opposite surface. Is preferred.

かかる構成によれば、一対の第1パッキンや第2パッキンの湾曲部においてパッキンの面圧を高めやすくなり、シール性能を向上できる。しかも、分岐ケースとの接触面とその反対側の面との両方に凸部を設けることで、均等に圧力を作用させることができる。また、第1パッキンを湾曲させると、分岐ケースとの接触面が引っ張られるとともに、その反対側の面が圧縮されるが、それらの面に複数の凸部を設けていることにより、かかる引張力や圧縮力を緩和してシール性能の影響を抑制できる。   According to this structure, it becomes easy to raise the surface pressure of packing in the curved part of a pair of 1st packing and 2nd packing, and can improve sealing performance. And a pressure can be made to act equally by providing a convex part in both the contact surface with a branch case, and the surface on the opposite side. Further, when the first packing is bent, the contact surface with the branch case is pulled and the surface on the opposite side is compressed. By providing a plurality of convex portions on these surfaces, the tensile force is applied. And the effect of seal performance can be suppressed by reducing the compression force.

本発明のパッキンでは、前記連結部に連なる前記湾曲部の両端が肉厚に形成されているものが好ましい。   In the packing according to the present invention, it is preferable that both ends of the curved portion connected to the connecting portion are formed thick.

湾曲部の両端では、その厚み方向が分割体同士の締め付け方向に対して傾斜するため、分割体同士を強く締め付けても面圧を高め難い傾向にある。そこで、上記の如く湾曲部の両端を肉厚に形成することにより、面圧を高めやすくしてシール性能を向上することができる。また、湾曲部の両端が肉厚であると、第2パッキンを立ち上がらせた際に姿勢が安定し、シール性能を確保しやすくなる。   At both ends of the bending portion, the thickness direction is inclined with respect to the tightening direction between the divided bodies, and therefore it is difficult to increase the surface pressure even if the divided bodies are strongly tightened. Therefore, by forming both ends of the curved portion thick as described above, the surface pressure can be easily increased and the sealing performance can be improved. Further, if both ends of the curved portion are thick, the posture is stabilized when the second packing is raised, and it becomes easy to ensure the sealing performance.

本発明に係るパッキンの装着方法は、上記のパッキンを変形させて、前記一対の第1パッキンを前記流体管との当接部位に沿って湾曲させるとともに、その湾曲した第1パッキンと同じ向きに前記湾曲部が突き出るように前記第2パッキンを立ち上がらせて前記分岐ケースに装着するものである。   In the packing mounting method according to the present invention, the above-described packing is deformed so that the pair of first packings are curved along the contact portion with the fluid pipe, and in the same direction as the curved first packing. The second packing is raised so that the curved portion protrudes and attached to the branch case.

かかる方法によれば、分割面間に分岐部を設定した分岐ケースに、上記のパッキンを適正な姿勢で装着できる。装着時のパッキンでは、分岐ケースが包囲した流体管の外周面に一対の第1パッキンが当接し、分岐部に接続した分岐管の外周面に第2パッキンの湾曲部が当接する。   According to such a method, the packing can be mounted in a proper posture on a branch case in which a branch portion is set between the split surfaces. In the packing at the time of mounting, the pair of first packings abuts on the outer peripheral surface of the fluid pipe surrounded by the branch case, and the curved portion of the second packing abuts on the outer peripheral surface of the branch pipe connected to the branch part.

本発明のパッキンを装着可能な分岐ケースの一例を示す斜視図The perspective view which shows an example of the branch case which can mount | wear with the packing of this invention 分岐ケースを構成する分割体の片方を示す斜視図The perspective view which shows one side of the division body which comprises a branch case 図2のA−A矢視断面を示す要部拡大図The principal part enlarged view which shows the AA arrow cross section of FIG. 分岐ケースに装着されているパッキンを示す斜視図The perspective view which shows the packing with which the branch case is mounted | worn 外力が作用しない自然状態におけるパッキンを示す斜視図Perspective view showing packing in a natural state where no external force acts 図5に示すパッキンを水道管の管軸方向から見た図The figure which looked at packing shown in Drawing 5 from the direction of a pipe axis of a water pipe 図5に示すパッキンの平面図Plan view of the packing shown in FIG.

以下、本発明の実施形態について、図面を参照しながら説明する。図1では、既設の流体管である水道管K1に、割T字管である分岐ケース1が外嵌装着され、その分岐部10に分岐管K2が接続されている。分岐ケース1で被覆された水道管K1の外周面には穿孔が施されており、流路がT字状に分岐している。分岐ケース1にはパッキン4(図1では不図示)が装着されていて、その内部が水密に密封されている。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, a branch case 1 that is a split T-shaped pipe is externally attached to a water pipe K <b> 1 that is an existing fluid pipe, and a branch pipe K <b> 2 is connected to the branch portion 10. The outer peripheral surface of the water pipe K1 covered with the branch case 1 is perforated, and the flow path branches in a T-shape. A packing 4 (not shown in FIG. 1) is attached to the branch case 1, and the inside is sealed watertight.

分岐ケース1は、上下に二分割され、互いにフランジ接続された複数(本実施形態では二つ)の分割体11,12により構成されている。各分割体のフランジ11a,12aには、ボルトとナットとからなる締結具3が取り付けられ、これを強固に締結することで分割体11と分割体12とが締め付けられる。分岐ケース1の外周面には、締結具3のボルトの軸線に沿ってリブ2を設けている。これにより、締結具3を締結した際にフランジ11a,12aの局部的な撓みを抑制し、分割体11,12を全体的に引き寄せることができる。   The branch case 1 is composed of a plurality of (two in the present embodiment) divided bodies 11 and 12 that are divided into two parts in the vertical direction and are flange-connected to each other. Fasteners 3 made of bolts and nuts are attached to the flanges 11a and 12a of each divided body, and the divided body 11 and the divided body 12 are tightened by firmly fastening them. A rib 2 is provided on the outer peripheral surface of the branch case 1 along the axis of the bolt of the fastener 3. Thereby, when the fastener 3 is fastened, local bending of the flanges 11a and 12a can be suppressed, and the divided bodies 11 and 12 can be pulled together.

図2は、分割体11の斜視図であり、図1に示した分割体11を裏返して内面側から示したものである。図3は、図2のA−A矢視断面を示す要部拡大図である。分割体11の分割面11Sでは、水道管K1との当接部位11bと、分岐管K2との当接部位11cとが円弧状に形成されており、その残りの部分にフランジ11aが形成されている。パッキン4は、分割面11Sの長手方向に沿って設けられた溝5に嵌入されており、必要であれば溝5にパッキン4を接着しても構わない。分割体12もこれと同様に構成され、パッキン4は分割体11,12の各々に装着される。   FIG. 2 is a perspective view of the divided body 11, and shows the divided body 11 shown in FIG. FIG. 3 is an enlarged view of a main part showing a cross section taken along the line AA in FIG. 2. In the dividing surface 11S of the divided body 11, the contact part 11b with the water pipe K1 and the contact part 11c with the branch pipe K2 are formed in an arc shape, and the flange 11a is formed in the remaining part. Yes. The packing 4 is fitted in a groove 5 provided along the longitudinal direction of the dividing surface 11S, and the packing 4 may be bonded to the groove 5 if necessary. The divided body 12 is configured in the same manner, and the packing 4 is attached to each of the divided bodies 11 and 12.

分割体11,12は、略水平方向に位置する互いの分割面を対向させており、その分割面間に分岐部10が設定されている。この分岐部10は、分割体11が有する分岐管K2との当接部位11cと、分割体12が有する分岐管K2との当接部位とを互いに対向させて構成されている。本実施形態では、分岐管K2の外周面に設けた突起6を分岐部10の凹部7に挿し込み可能に構成している。分岐管K2において分岐部10に接続される部分は、仕切弁や短筒状のアダプタなどで構成してもよい。   The divided bodies 11 and 12 are opposed to each other in a substantially horizontal direction, and a branching portion 10 is set between the divided surfaces. The branch portion 10 is configured such that a contact portion 11c of the divided body 11 with the branch pipe K2 and a contact portion of the divided body 12 with the branch tube K2 are opposed to each other. In the present embodiment, the projection 6 provided on the outer peripheral surface of the branch pipe K2 is configured to be insertable into the concave portion 7 of the branch portion 10. The part connected to the branch part 10 in the branch pipe K2 may be configured by a gate valve, a short cylindrical adapter, or the like.

図1において、分割体11には、図4に示した姿勢のパッキン4が装着され、分割体12には、これを上下反転した姿勢のパッキン4が装着されている。図4の矢印PDは、水道管K1の管軸方向である。パッキン4は、弾性を有する可撓性材料であるゴムで構成され、全体として枠型をなす無端状に形成されている。パッキン4は、水道管K1との当接部位11bに装着される一対の第1パッキン41,43と、それらの端部同士を連結し、分岐ケース1のフランジ間に介在する一対の第2パッキン42,44とを備える。   In FIG. 1, the packing 4 having the posture shown in FIG. 4 is attached to the divided body 11, and the packing 4 having the posture inverted upside down is attached to the divided body 12. The arrow PD in FIG. 4 is the pipe axis direction of the water pipe K1. The packing 4 is made of rubber, which is a flexible material having elasticity, and is formed in an endless shape that forms a frame shape as a whole. The packing 4 includes a pair of first packings 41 and 43 that are attached to the contact portion 11b with the water pipe K1, and a pair of second packings that connect the ends of the packings and are interposed between the flanges of the branch case 1. 42, 44.

図4に示すように、一対の第1パッキン41,43は、管軸方向PDに間隔を置いて設けられ、その各々が水道管K1の外周面に沿って半円状に湾曲している。また、分岐部10が設定された側に位置する第2パッキン42は、分岐部10に装着される円弧状の湾曲部42aと、その湾曲部42aの両端から第1パッキン41,43に連なる連結部42bとからなる。湾曲部42aは、分岐管K2の外周面に沿って半円状に湾曲しており、分岐部10と分岐管K2との間を密封する。分岐部10が反対側に設定される場合には、第2パッキン44にも当該形状が適用される。   As shown in FIG. 4, the pair of first packings 41 and 43 are provided at intervals in the pipe axis direction PD, and each of them is curved in a semicircular shape along the outer peripheral surface of the water pipe K1. The second packing 42 located on the side where the branching portion 10 is set includes an arcuate curved portion 42a attached to the branching portion 10 and a connection that is connected to the first packings 41 and 43 from both ends of the curved portion 42a. Part 42b. The curved portion 42a is bent in a semicircular shape along the outer peripheral surface of the branch pipe K2, and seals between the branch portion 10 and the branch pipe K2. When the branch part 10 is set on the opposite side, the shape is also applied to the second packing 44.

このパッキン4を分割体11から取り外して作業台などの平面に載置すると、重力以外の外力が作用しない自然状態では、図5に示すような形状になる。即ち、図4に示したパッキン4の姿勢は、図5のパッキン4を弾性変形させたものである。この状態のパッキン4では、図5,6に示すように、水道管K1の管軸方向PDから見て、一対の第1パッキン41,43が非湾曲形状を有して実質的に直線状に延在する。それでいて、第2パッキン42の湾曲部42aは、他方の第2パッキン44に向かって突き出た形状となる。この湾曲部42aは、分岐管K2の外周面に沿った半円状でなくても構わない。図5では、管軸方向PDが第2パッキン44の長手方向と同方向である。   When the packing 4 is removed from the divided body 11 and placed on a plane such as a work table, the shape shown in FIG. 5 is obtained in a natural state where no external force other than gravity acts. That is, the posture of the packing 4 shown in FIG. 4 is obtained by elastically deforming the packing 4 of FIG. In the packing 4 in this state, as shown in FIGS. 5 and 6, the pair of first packings 41 and 43 have a non-curved shape and are substantially linear when viewed from the pipe axis direction PD of the water pipe K <b> 1. Extend. Nevertheless, the curved portion 42 a of the second packing 42 has a shape protruding toward the other second packing 44. The curved portion 42a does not have to be semicircular along the outer peripheral surface of the branch pipe K2. In FIG. 5, the tube axis direction PD is the same as the longitudinal direction of the second packing 44.

分岐ケース1に装着する際には、パッキン4を弾性変形させて図4に示した姿勢にし、分割体の溝5に嵌入する。具体的には、一対の第1パッキン41,43を水道管K1との当接部位に沿って湾曲させるとともに、その湾曲した第1パッキン41,43と同じ向き(図4,5の上方向)に湾曲部42aが突き出るように第2パッキン42を立ち上がらせる。図5では、これらの変形の向きを矢印X,Yで示している。分岐ケース1に装着したパッキン4は、溝5により姿勢が拘束されているため、不意に復元することはない。   When mounting on the branch case 1, the packing 4 is elastically deformed to have the posture shown in FIG. 4 and is inserted into the groove 5 of the divided body. Specifically, the pair of first packings 41 and 43 are curved along the contact portion with the water pipe K1, and in the same direction as the curved first packings 41 and 43 (upward direction in FIGS. 4 and 5). The second packing 42 is raised so that the curved portion 42a protrudes. In FIG. 5, the directions of these deformations are indicated by arrows X and Y. Since the posture of the packing 4 attached to the branch case 1 is restrained by the groove 5, it is not restored unexpectedly.

パッキン4は、上述のように自然状態にて図5に示した形状を有しており、この形状にて一体的にモールドで成型することができる。したがって、図4のような形状のパッキンを成型する場合に比べると、立ち上がった部分を有していない分だけパッキンの高さが小さくなる。それ故、このパッキン4ではモールドを嵩張らせずにコンパクトに構成でき、分割面間に分岐部10を設定した分岐ケース1に装着されるものでありながら、モールドのコンパクト化を実現することができる。   The packing 4 has the shape shown in FIG. 5 in the natural state as described above, and can be integrally molded by this shape. Therefore, as compared with the case where the packing having the shape as shown in FIG. Therefore, the packing 4 can be configured compactly without bulking the mold, and the mold can be made compact while being mounted on the branch case 1 in which the branch portion 10 is set between the split surfaces. .

図5,6に示すように、外力が作用しない自然状態において、第1パッキン41,43と第2パッキン42,44との連結部位では、双方が高さ方向(図5,6の上下方向)に隣り合っている。かかる構成によれば、第1パッキン41,43を半円状に変形させた際に、図4に示すように第2パッキン42,44が外側に倒れ込み、湾曲部42aを上方に突き出しやすくなる。   As shown in FIGS. 5 and 6, in a natural state where no external force is applied, both are in the height direction (vertical direction in FIGS. 5 and 6) at the connecting portion between the first packing 41 and 43 and the second packing 42 and 44. Next to each other. According to such a configuration, when the first packings 41 and 43 are deformed into a semicircular shape, the second packings 42 and 44 are inclined to the outside as shown in FIG. 4, and the curved portion 42a is easily protruded upward.

図6に示すように、第2パッキン42の湾曲部42aの断面形状は、図3に示した第1パッキン41,43の断面形状と略同じである。このように、一対の第1パッキン41,43と湾曲部42aでは、分岐ケース1との接触面(溝5との接触面)とその反対側の面(管体との接触面)とに、複数の凸部8が幅方向に並設されている。この幅方向は、装着時におけるパッキン4の厚み方向に直交する方向であり、溝5の幅方向と同じになる。本実施形態のパッキン4は、当該部位の断面形状が略H字状をなし、上記の各面に二本の線状の凸部8が間隔をおいて並設されている。   As shown in FIG. 6, the cross-sectional shape of the curved part 42a of the 2nd packing 42 is substantially the same as the cross-sectional shape of the 1st packing 41 and 43 shown in FIG. Thus, in a pair of 1st packing 41 and 43 and the curved part 42a, in the contact surface (contact surface with the groove | channel 5) with the branch case 1, and the surface (contact surface with a tubular body) on the opposite side, A plurality of convex portions 8 are juxtaposed in the width direction. This width direction is a direction orthogonal to the thickness direction of the packing 4 at the time of mounting, and is the same as the width direction of the groove 5. In the packing 4 of this embodiment, the cross-sectional shape of the part is substantially H-shaped, and two linear protrusions 8 are arranged in parallel on each of the surfaces.

一方、第2パッキン42の連結部42bと第2パッキン44には、上記のような凸部8が設けられておらず、上記の各面が平坦に形成されている。これらの部位はフランジ11a,12aに近接しており、締結具3の操作により分割面間で強く圧接され、またパッキン4同士が接触することから、上記の如き凸部8を設けた場合には、パッキン4同士の接触面が変形し、却ってシール性能が低下する恐れがある。   On the other hand, the connecting portion 42b of the second packing 42 and the second packing 44 are not provided with the convex portions 8 as described above, and the respective surfaces are formed flat. These portions are close to the flanges 11a and 12a, and are pressed strongly between the divided surfaces by the operation of the fastener 3, and the packings 4 are in contact with each other. Therefore, when the convex portion 8 as described above is provided, The contact surfaces between the packings 4 may be deformed, and the sealing performance may be deteriorated.

図3に示すように、締結具3を強く締結する前の状態では、第1パッキン41,43と溝5との間に隙間9が幅方向に設けられている。湾曲部42aについても、これと同様である。かかる隙間9は、分割体11,12をフランジ接続した際に、パッキン4の圧縮量が増大したときのために予め設けられている。   As shown in FIG. 3, the gap 9 is provided in the width direction between the first packings 41 and 43 and the groove 5 before the fastener 3 is strongly fastened. The same applies to the curved portion 42a. The gap 9 is provided in advance when the compression amount of the packing 4 increases when the divided bodies 11 and 12 are flange-connected.

図4などに示すように、第2パッキン42では、連結部42bに連なる湾曲部42aの両端が肉厚に形成されており、その湾曲部42aの他の部分と比べて厚みが大である。これにより、当該部位の面圧を高めやすくして、シール性能を向上することができる。これと同様に、第1パッキン41,43においても、第2パッキン42,44に連なる両端を相対的に肉厚に形成している。   As shown in FIG. 4 etc., in the 2nd packing 42, the both ends of the curved part 42a connected to the connection part 42b are formed in thickness, and thickness is large compared with the other part of the curved part 42a. Thereby, the surface pressure of the said part can be made easy to raise and sealing performance can be improved. Similarly, in the first packings 41 and 43, both ends connected to the second packings 42 and 44 are relatively thick.

図7は、図5に示したパッキン4の平面図であり、このパッキン4を一体的に成型するためのモールドMを破線で示している。このモールドMは、第2パッキン44を成型する第1の部材M1と、第1パッキン41,43の中央部を成型する第2の部材M2と、第2パッキン42を成型する第3の部材M3とにより構成されている。かかる構造のモールドMであれば、水道管K1と分岐管K2の両方の管径に適宜に対応できるため、モールドの種類が多大に増えるという問題を軽減できる。   FIG. 7 is a plan view of the packing 4 shown in FIG. 5, and a mold M for integrally molding the packing 4 is indicated by a broken line. The mold M includes a first member M1 that molds the second packing 44, a second member M2 that molds the center of the first packings 41 and 43, and a third member M3 that molds the second packing 42. It is comprised by. With the mold M having such a structure, it is possible to appropriately cope with both the pipe diameters of the water pipe K1 and the branch pipe K2, so that the problem that the types of molds are greatly increased can be reduced.

即ち、水道管K1の管径の変化に対しては、第1パッキン41,43の長さを変えることで対処できることから、水道管K1の管径に応じたサイズの異なる第2の部材M2を用意すればよい。また、分岐管K2の管径の変化に対しては、湾曲部42aのサイズを変えることで対処できるため、分岐管K2の管径に応じたサイズの異なる第3の部材M3を用意すればよい。なお、第2パッキン44に管径等の表示を成型する場合には、第1の部材M1も各種を用意する必要がある。   That is, since the change of the pipe diameter of the water pipe K1 can be dealt with by changing the length of the first packings 41 and 43, the second member M2 having a different size according to the pipe diameter of the water pipe K1 is provided. Just prepare. Moreover, since the change of the pipe diameter of the branch pipe K2 can be dealt with by changing the size of the curved portion 42a, a third member M3 having a different size according to the pipe diameter of the branch pipe K2 may be prepared. . In addition, when forming indications, such as a pipe diameter, in the 2nd packing 44, it is necessary to prepare various 1st members M1.

例えば、水道管K1の管径が4種、分岐管K2の管径が3種である場合、通常であれば、それらの組み合わせに応じた12種のモールドを用意する必要が生じ、そのモールドの各々は上記のモールドMに相当する大きさとなる。これに対して、上記のモールドMであれば、少なくとも1種の第1の部材M1と、4種の第2の部材M2と、3種の第3の部材M3とを用意すれば足り、それらは何れもモールドMよりも小さくて取り扱いが容易である。   For example, when the pipe diameter of the water pipe K1 is 4 types and the diameter of the branch pipe K2 is 3 types, it is usually necessary to prepare 12 types of molds according to the combination of them. Each has a size corresponding to the mold M described above. On the other hand, in the case of the above-described mold M, it is sufficient to prepare at least one kind of first member M1, four kinds of second members M2, and three kinds of third members M3. Are smaller than the mold M and easy to handle.

上述した実施形態では、パッキンを装着する分岐ケースが、既設の流体管に分岐管を接続する際に使用する割T字管である例を示したが、これに限定されるものではなく、例えば水道管のT字部周辺が破損して漏水している場合に、その部分に取り付けて包囲する補修用金具などであってもよい。また、分岐ケースが包囲する流体管は、水道管に限られるものではなく、各種の液体や気体が流れる流体管であってよい。   In the above-described embodiment, the example in which the branch case to which the packing is attached is a split T-shaped pipe used when connecting the branch pipe to the existing fluid pipe is not limited to this. When the vicinity of the T-shaped portion of the water pipe is damaged and leaks water, a repair fitting that is attached to and surrounds the portion may be used. The fluid pipe surrounded by the branch case is not limited to the water pipe, and may be a fluid pipe through which various liquids and gases flow.

1 分岐ケース
4 パッキン
5 溝
8 凸部
10 分岐部
11 分割体
12 分割体
41 第1パッキン
42 第2パッキン
43 第1パッキン
44 第2パッキン
42a 湾曲部
42b 連結部
K1 水道管(流体管)
K2 分岐管
DESCRIPTION OF SYMBOLS 1 Branch case 4 Packing 5 Groove 8 Protruding part 10 Dividing part 11 Divided body 12 Divided body 41 First packing 42 Second packing 43 First packing 44 Second packing 42a Curved part 42b Connection part K1 Water pipe (fluid pipe)
K2 branch pipe

Claims (4)

互いにフランジ接続される複数の分割体の分割面間に分岐部を設定した分岐ケースに装着され、流体管を包囲した前記分岐ケースの内部を密封するパッキンにおいて、
前記流体管との当接部位に装着される一対の第1パッキンと、前記第1パッキンの端部同士を連結し、前記分岐ケースのフランジ間に介在する一対の第2パッキンとを備え、前記第2パッキンの少なくとも片方が、前記分岐部に装着される円弧状の湾曲部と、その湾曲部の両端から前記第1パッキンに連なる連結部とからなり、
外力が作用しない自然状態では、前記流体管の管軸方向から見て前記一対の第1パッキンが直線状に延在するとともに、前記第2パッキンの湾曲部が他方の第2パッキンに向かって突き出た形状であることを特徴とするパッキン。
In the packing for sealing the inside of the branch case that is attached to the branch case that sets the branch portion between the split surfaces of the plurality of split bodies that are flange-connected to each other and surrounds the fluid pipe,
A pair of first packings mounted on a contact portion with the fluid pipe; and a pair of second packings connecting ends of the first packings and interposed between flanges of the branch case; At least one of the second packings is composed of an arcuate curved portion that is attached to the branch portion, and a connecting portion that is connected to the first packing from both ends of the curved portion,
In a natural state where no external force acts, the pair of first packings extend linearly when viewed from the tube axis direction of the fluid pipe, and the curved portion of the second packing projects toward the other second packing. Packing characterized by its shape.
前記一対の第1パッキン及び前記第2パッキンの湾曲部は、前記分岐ケースとの接触面とその反対側の面とに、複数の凸部が幅方向に並設されている請求項1に記載のパッキン。   The curved portion of the pair of first packing and the second packing has a plurality of convex portions arranged in parallel in the width direction on a contact surface with the branch case and a surface on the opposite side. Packing. 前記連結部に連なる前記湾曲部の両端が肉厚に形成されている請求項1又は2に記載のパッキン。   The packing according to claim 1 or 2, wherein both ends of the curved portion connected to the connecting portion are formed thick. 請求項1〜3のいずれか1項に記載のパッキンを変形させて、前記一対の第1パッキンを前記流体管との当接部位に沿って湾曲させるとともに、その湾曲した第1パッキンと同じ向きに前記湾曲部が突き出るように前記第2パッキンを立ち上がらせて前記分岐ケースに装着するパッキンの装着方法。   The packing according to any one of claims 1 to 3 is deformed so that the pair of first packings are curved along a contact portion with the fluid pipe, and in the same direction as the curved first packing. The packing is attached to the branch case by raising the second packing so that the curved portion protrudes.
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