JP2006125523A

JP2006125523A - Compression coupling for pipe

Info

Publication number: JP2006125523A
Application number: JP2004314807A
Authority: JP
Inventors: Kazuaki Yamamoto; 和明山本
Original assignee: Sekisui Chemical Co Ltd
Current assignee: Sekisui Chemical Co Ltd
Priority date: 2004-10-28
Filing date: 2004-10-28
Publication date: 2006-05-18
Anticipated expiration: 2024-10-28
Also published as: JP4796764B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compression coupling for pipe making it difficult for a compression ring to come thereout and manufacturable at low cost and a compression coupling of pipe formed in such a structure that the metal layer of a compound pipe does not come into contact with a coupling body. <P>SOLUTION: In this compression coupling for pipe, the metal compound resin pipe is inserted into a clearance between the coupling body and the compression ring formed by covering the body and the compression ring is compressively deformed to pressingly bring the compound resin pipe into contact with the coupling body for connecting them to each other. The base part of the compression ring is bent to the pipe joint side, the bent part side end part of the compression ring is inserted into the insertion groove of the compression ring on the bottom side of the coupling body, and an annular member formed of an elastic body is press-fitted between the inner peripheral surface of the bent part of the compression ring and the wall surface of the insertion groove. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、中間層に金属を積層した金属複合樹脂管を接続する配管用圧縮継手に関し、更に詳しくは、継手本体と本体を覆って設けられる圧縮リングとの隙間に金属複合樹脂管を挿入し、圧縮リングを圧縮変形させることで、複合樹脂管を継手本体に圧接して接続する管継手であり、例えば、アルミニウム合金を中間層としてその両面を変性ポリエチレンを介して架橋ポリエチレン層を積層したアルミニウム強化架橋ポリエチレン管等を用いた配管に好適に用いることができる配管用圧縮継手に関するものである。 The present invention relates to a compression joint for piping for connecting a metal composite resin pipe in which a metal is laminated on an intermediate layer. More specifically, the metal composite resin pipe is inserted into a gap between a joint main body and a compression ring provided to cover the main body. , A pipe joint that compresses and deforms the compression ring to connect the composite resin pipe to the joint body by pressure contact. For example, aluminum in which an aluminum alloy is used as an intermediate layer and a cross-linked polyethylene layer is laminated on both sides via modified polyethylene The present invention relates to a compression joint for piping that can be suitably used for piping using a reinforced crosslinked polyethylene pipe or the like.

金属層を積層した樹脂管、特に、中間層をアルミニウム合金層としその両側にポリエチレン層を積層した金属複合樹脂管（以降、複合管という。）は、高温領域で長期に渡って使用でき、かつ耐食性、保温性に優れ、しかも柔軟で軽量であるゆえに施工が簡単であるので、給水給湯配管やファンコイルユニットと冷温水管の接続に多用される。 A resin tube in which a metal layer is laminated, particularly a metal composite resin tube (hereinafter referred to as a composite tube) in which an intermediate layer is an aluminum alloy layer and polyethylene layers are laminated on both sides thereof, can be used for a long time in a high temperature region, and Since it is excellent in corrosion resistance and heat retention, and is flexible and lightweight, it is easy to construct. Therefore, it is frequently used for connecting hot and cold water pipes to water and hot water supply pipes and fan coil units.

複合管の接続に用いられる管継手としては、代表的な管継手とて、通常、圧縮式継手、締め込み式継手、差し込み式継手の三種類の接続継手がある。これらの継手の内、製品の単価、接続部の信頼性、施工性等を総合的に考慮して、圧縮式継手が用いられることが多い。圧縮式継手は管口径の大小によらず上記性能を安定的に発現する管継手である。 As pipe joints used for connecting composite pipes, there are usually three kinds of connection joints: compression joints, tightening joints, and plug-in joints as typical pipe joints. Of these joints, compression joints are often used in consideration of the unit price of products, the reliability of connection parts, workability, and the like. The compression joint is a pipe joint that stably exhibits the above performance regardless of the pipe diameter.

上記圧縮継手としては、被接続管に挿入される接続部に止水ゴムリングが装着され、接続部の外側に圧縮リングが装着され、被接続管を接続部と圧縮リングとの間に挿入し、専用の圧縮治具で圧縮リングを圧縮変形させて、継手接続部に複合管を強固に食い込ませることにより高い接合部信頼性を実現する圧縮継手が知られている（例えば、非特許文献１参照。）。 As the compression joint, a water stop rubber ring is attached to the connection part inserted into the connected pipe, a compression ring is attached to the outside of the connection part, and the connected pipe is inserted between the connection part and the compression ring. A compression joint that realizes high joint reliability by compressing and deforming a compression ring with a dedicated compression jig and causing the composite pipe to bite into the joint connection portion is known (for example, Non-Patent Document 1). reference.).

図５にこの圧縮継手の構造を示す。この圧縮継手１においては、管接続部２に被接続管例えば複合管Ｐを挿入し、その外側に設けられている圧縮リング６を専用工具を用いて圧縮すると止水パッキン４に被接続管Ｐの内面が強く押し付けられて止水性能を得る。
濱秀行，「「エスロンスーパーエスロメタックス」のご紹介」，月刊コア，日本設備工業新聞社，平成１６年２月１日，第１６巻，第２号，通巻第１７１号，Ｐ．２０−Ｐ．２３ FIG. 5 shows the structure of this compression joint. In this compression joint 1, when a pipe to be connected, for example, a composite pipe P is inserted into the pipe connection portion 2 and the compression ring 6 provided outside thereof is compressed using a dedicated tool, the pipe to be connected P is connected to the water blocking packing 4. The inner surface of is strongly pressed to obtain water stop performance.
Hideyuki Tsuji, “Introduction of“ Eslon Super Estrometax ””, Monthly Core, Nippon Equipment Industries Newspaper, February 1, 2004, Vol. 16, No. 2, Vol. 20-P. 23

上記圧縮継手１の管接続部２に装着される圧縮リング６は、元部６１が圧縮継手１の軸側側に屈曲され、継手本体１の圧縮リング挿入溝５に、元部即ち屈曲側端部６１が挿入されて圧縮継手１に装着されている。屈曲側端部６１の外径は、挿入溝５の外周側壁の内径より僅かに広くされているので、装着時に、装着用の治具を用いて挿入溝５に押し込むことで摩擦力によって抜け難くなる。 The compression ring 6 attached to the pipe connection portion 2 of the compression joint 1 has a base portion 61 bent to the axial side of the compression joint 1 and a base portion, that is, a bent side end in the compression ring insertion groove 5 of the joint body 1. The portion 61 is inserted and attached to the compression joint 1. Since the outer diameter of the bent side end portion 61 is slightly wider than the inner diameter of the outer peripheral side wall of the insertion groove 5, it is difficult to come out by frictional force by pushing it into the insertion groove 5 using a mounting jig during mounting. Become.

しかしながら、、圧縮継手１の輸送や保管時には、輸送時の振動や取り扱い時の落下で、圧縮リング６が挿入溝５から外れてしまうことが起こる。継手使用前に外れると、手のみで再挿入することは困難であるために、そのまま圧縮リング６を締め付けて複合管Ｐを接続してしまうことがある。この場合、複合管Ｐの接続が不完全になり、漏水の原因になったり、接続が外れてしまうという問題点が起こる。これを防止するために、継手本体と圧縮リングとに引っ掛かり形状を設けたり、ねじ止めするための加工をする等の特殊な加工を施すことで圧縮リング６の外れを防ぐことは可能であるが、大幅なコストアップにとなって製品競争力が失われる恐れがある。 However, when the compression joint 1 is transported or stored, the compression ring 6 may be detached from the insertion groove 5 due to vibration during transportation or dropping during handling. If it is removed before using the joint, it is difficult to insert it again by hand. Therefore, the compression ring 6 may be tightened and the composite pipe P may be connected. In this case, the connection of the composite pipe P becomes incomplete, causing problems such as water leakage or disconnection. In order to prevent this, it is possible to prevent the compression ring 6 from coming off by applying a special process such as forming a hook shape on the joint body and the compression ring or performing a process for screwing. There is a risk that product competitiveness will be lost due to significant cost increase.

本発明は、圧縮リングが外れにくい配管用圧縮継手を安価に提供する目的でなされたものである。同時に、複合管の金属層が継手本体と接触しない構造の配管用圧縮継手を提供するものである。 The present invention has been made for the purpose of providing inexpensively a compression joint for piping in which a compression ring is unlikely to come off. At the same time, the present invention provides a compression joint for piping having a structure in which the metal layer of the composite pipe does not contact the joint body.

請求項１記載の配管用圧縮継手（発明１）は、継手本体と本体を覆って設けられる圧縮リングとの隙間に金属複合樹脂管を挿入し、圧縮リングを圧縮変形させることで、複合樹脂管を継手本体に圧接して接続する管継手であって、該圧縮リングの元部が管継手側に屈曲され、圧縮リングの屈曲部側端部が継手本体奥側の圧縮リング挿入溝に挿入され、圧縮リングの屈曲部内周面と挿入溝壁面との間に、弾性体からなる環状部材が押し込まれていることを特徴とする。 A compression joint for pipes (Invention 1) according to claim 1 is a composite resin pipe in which a metal composite resin pipe is inserted into a gap between a joint main body and a compression ring provided to cover the main body, and the compression ring is compressed and deformed. The compression ring is bent at the base of the compression ring, and the end of the compression ring is inserted into the compression ring insertion groove at the back of the coupling body. An annular member made of an elastic body is pushed between the inner peripheral surface of the bent portion of the compression ring and the wall surface of the insertion groove.

請求項２の発明（発明２）は、環状部材が電気絶縁性を有することを特徴とする発明１の配管用圧縮継手である。 Invention of Claim 2 (Invention 2) is the compression joint for piping of Invention 1, wherein the annular member has electrical insulation.

請求項３記載の配管用圧縮継手（発明３）は、継手本体と本体を覆って設けられる圧縮リングとの隙間に金属複合樹脂管を挿入し、圧縮リングを圧縮変形させることで、複合樹脂管を継手本体に圧接して接続する管継手であって、該圧縮リングの元部が管継手側に屈曲され、該継手本体奥側の圧縮リング挿入溝の管軸側底面と側壁とに掛けて、断面矩形の突条環が設けられ、上記挿入溝の管軸外側壁と突条環の管軸外側壁との隙間の長さが、上記圧縮リングの屈曲部の平面投影幅と略同じで僅かに小さくされていることを特徴とする。 A compression joint for pipes (invention 3) according to claim 3 is a composite resin pipe in which a metal composite resin pipe is inserted into a gap between a joint main body and a compression ring provided to cover the main body, and the compression ring is compressed and deformed. The compression ring is bent to the pipe joint side, and is hung on the pipe shaft side bottom surface and the side wall of the compression ring insertion groove on the back side of the joint body. A protrusion ring having a rectangular cross section is provided, and the length of the gap between the tube shaft outer wall of the insertion groove and the tube shaft outer wall of the protrusion ring is substantially the same as the planar projection width of the bent portion of the compression ring. It is characterized by being made slightly smaller.

請求項４の発明（発明４）は、突条環の溝底面から管軸方向への高さが、上記金属複合樹脂管中の金属層に接触しない高さとされていることを特徴とする発明３の配管用圧縮継手である。 The invention of claim 4 (invention 4) is characterized in that the height from the groove bottom surface of the ridge ring to the tube axis direction is a height that does not contact the metal layer in the metal composite resin tube. 3 is a compression joint for piping.

請求項５記載の配管用圧縮継手（発明５）は、継手本体と本体を覆って設けられる圧縮リングとの隙間に金属複合樹脂管を挿入し、圧縮リングを圧縮変形させることで、複合樹脂管を継手本体に圧接して接続する管継手であって、該圧縮リングの元部が管継手側に屈曲され、圧縮リングの屈曲部の平面投影幅が、上記継手の圧縮リング層入溝の溝幅と略同じで僅かに大きくされていることを特徴とする。 The compression joint for pipes (invention 5) according to claim 5 is a composite resin pipe in which a metal composite resin pipe is inserted into a gap between a joint main body and a compression ring provided to cover the main body, and the compression ring is compressed and deformed. The compression ring is bent to the pipe joint side, and the projected width of the bent portion of the compression ring is the groove of the compression ring layer groove of the joint. It is characterized by being slightly the same as the width.

本発明１から５の圧縮継手は、いずれも、アルミニウム、防食された鉄、銅、ステンレススチール、真鍮等の金属類で形成されることが好ましいが、被接続管が複合管の場合には硬質樹脂製又は繊維補強された硬質樹脂製とすることもできる。被接続管は、合成樹脂とアルミニウム等の金属材料との複合管類；硬質塩化ビニル系樹脂管、ポリエチレン管、架橋ポリエチレン管、ポリプロピレン管、ポリブデン管、ポリエチレンと架橋ポリエチレンの二層複層管、ポリアミド径樹脂管ポリフェニレンサルファイド管等の合成樹脂管類などが挙げられる。 Any of the compression joints of the present invention 1 to 5 is preferably made of metals such as aluminum, anticorrosive iron, copper, stainless steel, brass, etc., but hard when the connected pipe is a composite pipe. It can also be made of a resin or a hard resin reinforced with fibers. Connected pipes are composite pipes of synthetic resin and metal materials such as aluminum; hard vinyl chloride resin pipes, polyethylene pipes, cross-linked polyethylene pipes, polypropylene pipes, polybutene pipes, double-layer multi-layer pipes of polyethylene and cross-linked polyethylene Examples thereof include synthetic resin pipes such as polyamide diameter resin pipes and polyphenylene sulfide pipes.

接続本体奥には、被接続管がそれ以上奥に挿入されないように、管の突き当たり壁が設けられる。圧縮リングの挿入溝は、更にその突き当たり壁の奥側に設けられる。 At the back of the connection main body, a tube abutting wall is provided so that the connected pipe is not inserted further into the back. The insertion groove of the compression ring is further provided on the back side of the abutting wall.

圧縮リングは、元部が管継手側に屈曲され、屈曲部側端部が継手本体奥側の圧縮リング挿入溝に挿入されて継手に装着される。それゆえ、圧縮リングは接続部の外側に装着されることになり、接続部と圧縮リングの間に被接続管が挿入される。 The compression ring is bent to the pipe joint side, and the bent part side end is inserted into the compression ring insertion groove on the deep side of the joint body and attached to the joint. Therefore, the compression ring is attached to the outside of the connection portion, and the connected pipe is inserted between the connection portion and the compression ring.

圧縮リングはその外側から圧縮治具でかしめられて、被接続管を接続部に密着させる。従って、その材質は、圧縮変形された場合に、塑性変形して変形された形状を保つことが必要であり、例えば一例として、ステンレススチール、アルミニウム、防食された鉄、真鍮等の金属薄板を円筒形状に加工したものが挙げられる。 The compression ring is caulked from the outside with a compression jig, and the connected pipe is brought into close contact with the connection portion. Therefore, when the material is compressed and deformed, it is necessary to keep the deformed shape by plastic deformation. For example, a metal thin plate such as stainless steel, aluminum, anticorrosive iron, or brass is used as a cylinder. The thing processed into the shape is mentioned.

発明１においては、継手本体奥部の圧縮リング挿入溝に挿入された圧縮リングの、屈曲部内周面と挿入溝壁面との隙間には、弾性体からなる環状部材が押し込まれている。この環状部材の幅は、上記隙間の幅より僅かに広くされ、隙間に押し込まれた時にその両壁面を圧迫し、圧縮リング外周面と挿入溝壁との摩擦力を増大するように作用する。従って、継手本体に装着された圧縮リングは外れ難くなる。 In the invention 1, the annular member made of an elastic body is pushed into the gap between the inner peripheral surface of the bent portion and the wall surface of the insertion groove of the compression ring inserted into the compression ring insertion groove at the back of the joint body. The width of the annular member is slightly wider than the width of the gap, and when pressed into the gap, it presses both wall surfaces and acts to increase the frictional force between the outer peripheral surface of the compression ring and the insertion groove wall. Therefore, the compression ring attached to the joint body is difficult to come off.

環状部材の材質は、塩化ビニル樹脂、ポリエチレン、ポリプロピレン、ポリサルファイド、アミド樹脂、アクリルスチレンブタジエン共重合樹脂等の熱可塑性樹脂類；これら樹脂の低倍率発泡体類；天然ゴム、合成ゴム等のゴム弾性体等、が挙げられる。 The material of the annular member is thermoplastic resins such as vinyl chloride resin, polyethylene, polypropylene, polysulfide, amide resin, and acrylic styrene butadiene copolymer resin; low-magnification foams of these resins; rubber elasticity such as natural rubber and synthetic rubber Body, etc.

環状部材を圧縮リングと挿入溝との隙間に挿入するには、先ず圧縮リングの屈曲部位置に環状部材を挿着して継手の管接続部に挿嵌する。次いで、圧縮リングの端面を押して圧縮リングを挿入溝に押し込むリング押込み部を有し、かつ上記隙間に挿入可能で環状部材を押し込む環状押込み筒を有する圧縮リング挿着具で、圧縮リングを挿入溝に押し込んで挿入すると、環状部材は環状押し込み筒によって挿入溝底面位置に押し込まれる。 In order to insert the annular member into the gap between the compression ring and the insertion groove, first, the annular member is inserted into the bending portion position of the compression ring, and is inserted into the pipe connecting portion of the joint. Next, the compression ring is inserted into the insertion groove by a compression ring insertion tool having a ring pushing portion for pushing the end face of the compression ring and pushing the compression ring into the insertion groove, and having an annular pushing cylinder which can be inserted into the gap and pushes the annular member. When inserted into the insertion groove, the annular member is pushed into the insertion groove bottom surface by the annular pushing cylinder.

なお、発明２におけるように、環状部材が電気絶縁性を有する材質であれば、複合管接続後に、複合管の金属層が継手と接触することがほとんどなくなる。上記材質であればほとんどその作用を有するので好都合である。 As in the second aspect, if the annular member is a material having electrical insulation, the metal layer of the composite pipe hardly comes into contact with the joint after the composite pipe is connected. The above materials are advantageous because they have almost the same effect.

発明３においては、継手本体奥側の圧縮リング挿入溝の管軸側底面と側壁とに掛けて、断面矩形の突条環が設けられる。即ち、挿入溝の溝幅が突条環により狭められて、狭い幅の溝が新たに構成されることになる。上記挿入溝の管軸外側壁と突条環の管軸外側壁との隙間の長さ即ち新たに構成される溝の幅は、上記圧縮リングの屈曲部の平面投影寸法と略同じで僅かに小さくされている。 In the invention 3, the ridge ring having a rectangular cross section is provided on the tube shaft side bottom surface and the side wall of the compression ring insertion groove on the back side of the joint body. That is, the groove width of the insertion groove is narrowed by the protruding ring, and a narrow groove is newly constructed. The length of the gap between the tube shaft outer wall of the insertion groove and the tube shaft outer wall of the ridge ring, that is, the width of the newly formed groove is substantially the same as the planar projection size of the bent portion of the compression ring, and slightly It has been made smaller.

圧縮リングは、新らたに構成される狭い幅の溝に挿入される。その幅が圧縮リングの平面投影幅と略同じで僅かに狭いので、圧縮リング外周面と挿入溝壁との摩擦力が増大する。従って、継手本体に装着された圧縮リングは外れ難くなる。 The compression ring is inserted into a newly constructed narrow-width groove. Since the width is substantially the same as the plane projection width of the compression ring and slightly narrower, the frictional force between the outer peripheral surface of the compression ring and the insertion groove wall increases. Therefore, the compression ring attached to the joint body is difficult to come off.

発明４においては、上記突条環の溝底面から管軸方向への高さが、上記金属複合樹脂管中の金属層に接触しない高さとされている。 In the invention 4, the height from the groove bottom surface of the ridge ring to the tube axis direction is set to a height that does not contact the metal layer in the metal composite resin tube.

即ち、上記段の継手軸側からの突設高さは、複合管の外側樹脂層部の厚さ以下とされるので、管接続部奥に設けられる被接続管の突き当たり壁に端面が当たるまで複合管を挿入した時に、複合管端面に露出している金属層と継手とが接触しないようにされている。また、複合管の端面を管内側に向かう傾斜面として面取りされている場合であっても、その傾斜面の樹脂層部に上記段の角部が接触する高さとなるので、面取りしても、複合管の金属層と継手とは接触しない。 That is, since the projecting height from the joint shaft side of the step is set to be equal to or less than the thickness of the outer resin layer part of the composite pipe, until the end surface hits the abutting wall of the connected pipe provided in the back of the pipe connecting part. When the composite pipe is inserted, the metal layer exposed on the end face of the composite pipe is not in contact with the joint. In addition, even when the end face of the composite pipe is chamfered as an inclined surface toward the inside of the pipe, the corner portion of the step is in contact with the resin layer portion of the inclined surface. The metal layer of the composite pipe and the joint do not contact.

なお、接続部奥の被接続管の突き当たり壁は、複合管の金属層と継手の金属とが接触して電食することを防止するため、複合管を奥部まで差し込んで突き当たり壁に当てた時に、複合管の端面が接続部奥壁と接触しないように、段付きとされているものである。 In addition, the abutting wall of the connected pipe at the back of the connecting part was inserted into the inner part of the composite pipe and hit the abutting wall in order to prevent the metal layer of the composite pipe and the metal of the joint from coming into contact with each other. Sometimes, the composite pipe is stepped so that the end face of the composite pipe does not come into contact with the connecting portion back wall.

発明５においては、圧縮リングの屈曲部の平面投影幅が、上記継手の圧縮リング挿入溝の溝幅と略同じで僅かに大きくされている。前述の特許文献１記載の従来の圧縮リングでは、通常圧縮リングの平面投影幅は挿入溝の幅と略同じとされているので、圧縮リングを挿入溝に挿入しても圧縮リング外周面と挿入溝壁との摩擦力が小さく、且つ摩擦力にバラツキが見られることがある。従って、圧縮リングの屈曲部の平面投影幅を、圧縮リング挿入溝の溝幅より僅かに大きくすることで、挿入された圧縮リングの外周面と挿入溝壁との摩擦力が増大する上、圧縮リングの屈曲部先端と挿入溝壁とが接触するので、益々摩擦力が増大する。 In the invention 5, the plane projection width of the bent portion of the compression ring is substantially the same as the groove width of the compression ring insertion groove of the joint, and is slightly increased. In the conventional compression ring described in Patent Document 1, the plane projection width of the compression ring is usually the same as the width of the insertion groove. Therefore, even if the compression ring is inserted into the insertion groove, the compression ring is inserted into the outer peripheral surface of the compression ring. The frictional force with the groove wall is small, and the frictional force may vary. Therefore, by making the plane projection width of the bent portion of the compression ring slightly larger than the groove width of the compression ring insertion groove, the frictional force between the outer peripheral surface of the inserted compression ring and the insertion groove wall increases, and the compression Since the tip of the bent portion of the ring comes into contact with the insertion groove wall, the frictional force increases more and more.

勿論、接続部奥の被接続管の突き当たり壁は、上記と同様に段付きとされているので、複合管の金属層と継手の金属とが接触せず、電食することが防止される。 Of course, since the abutting wall of the pipe to be connected at the back of the connecting portion is stepped in the same manner as described above, the metal layer of the composite pipe and the metal of the joint do not come into contact with each other, and electrolytic corrosion is prevented.

発明１においては、弾性を有する環状部材を圧縮リングと挿入溝との間に押し込むのみで、圧縮リング外周面と挿入溝壁との間の摩擦力が増大して圧縮リングが外れにくくなり、かつ安価に提供できる。 In the first aspect of the present invention, simply by pushing an elastic annular member between the compression ring and the insertion groove, the frictional force between the outer peripheral surface of the compression ring and the insertion groove wall is increased, and the compression ring is not easily detached. Can be provided at low cost.

発明２においては、環状部材が電気絶縁性を有するので、複合管の金属層が継手と接触することがほとんどなくなる。 In the invention 2, since the annular member has electrical insulation, the metal layer of the composite pipe hardly comes into contact with the joint.

発明３においては、圧縮リング挿入溝に突条環が設けられるのみで、挿入溝の溝幅が狭くされているので、圧縮リング外周面と挿入溝壁との間の摩擦力が増大することに加え、圧縮リングの屈曲側端部が突条環の側壁に圧接された摩擦力が加わるので、圧縮リングが外れにくくなり、かつ安価に提供できる。 In the invention 3, since only the protrusion ring is provided in the compression ring insertion groove and the groove width of the insertion groove is narrowed, the frictional force between the outer peripheral surface of the compression ring and the insertion groove wall is increased. In addition, since the frictional force in which the bent side end portion of the compression ring is pressed against the side wall of the ridge ring is applied, the compression ring is hardly detached and can be provided at low cost.

発明４においては、突条環の溝底面から管軸方向への高さが、複合管中の金属層に接触しない高さとされているので、金属層が継手金属に接触して電食することががほとんどない。 In invention 4, since the height in the tube axis direction from the groove bottom surface of the ridge ring is set so as not to contact the metal layer in the composite tube, the metal layer contacts the joint metal and galvanizes. There is almost no.

発明５においては、圧縮リング屈曲部の屈曲幅が、屈曲部の平面投影幅が挿入溝の幅より広くなるように屈曲されているので、圧縮リングを挿入溝に押し込むのみで、圧縮リング外周面と挿入溝壁との間の摩擦力が増大して圧縮リングが外れにくくなり、かつ安価に提供できる。 In the invention 5, since the bent width of the compression ring bent portion is bent so that the projected width of the bent portion is wider than the width of the insertion groove, the compression ring outer peripheral surface can be obtained simply by pushing the compression ring into the insertion groove. And the insertion groove wall increase in frictional force, making it difficult for the compression ring to come off and providing at low cost.

次に図面を参照して本発明を説明する。図１は発明１の配管用圧縮継手の一例の断面図である。図２は環状部材の一例であり（ａ）は断面形状が円形であるものの一例の断面図、（ｂ）は断面形状が矩形であるものの一例の断面図である。図３は発明３の配管用圧縮継手の一例の断面図である。図４は発明５の配管用圧縮継手の一例の断面図である。図５は従来の配管用圧縮継手の断面図である。 Next, the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of an example of a compression joint for piping according to the first aspect of the present invention. FIG. 2 is an example of an annular member. FIG. 2A is a cross-sectional view of an example of a circular cross-sectional shape, and FIG. 2B is a cross-sectional view of an example of a rectangular cross-sectional shape. FIG. 3 is a cross-sectional view of an example of a compression joint for piping of the third invention. FIG. 4 is a cross-sectional view of an example of a compression joint for piping of the fifth aspect. FIG. 5 is a cross-sectional view of a conventional compression joint for piping.

図１の配管用圧縮継手においては、圧縮継手１の管接続部２に圧縮リング６が装着されている。圧縮リング６と管接続部２との間には複合管Ｐが挿入される。圧縮リングは６は継手１の奥部に設けられる圧縮リング挿入溝５に挿入されて継手１に装着されている。複合管Ｐは、その差し込み端面が、管接続部２の奥部に設けられた突き当たり壁３に当たってそれ以上奥に過挿入しないようにされている。従って、複合管Ｐの端面に露出している、中間層として積層されている金属層（アルミニウム層）Ａは、圧縮継手１に接触しないので電食は起こらない。 In the compression joint for piping of FIG. 1, a compression ring 6 is attached to the pipe connection portion 2 of the compression joint 1. A composite pipe P is inserted between the compression ring 6 and the pipe connection portion 2. The compression ring 6 is inserted into a compression ring insertion groove 5 provided at the back of the joint 1 and is attached to the joint 1. The composite pipe P is configured so that the insertion end surface thereof abuts against the abutting wall 3 provided in the back part of the pipe connection part 2 and is not excessively inserted further into the back. Therefore, the metal layer (aluminum layer) A that is exposed as an intermediate layer and is exposed on the end face of the composite pipe P does not contact the compression joint 1, so that no electrolytic corrosion occurs.

圧縮リング６の元部６１は、管軸側に屈曲されている。この屈曲は圧縮リング６を挿入溝に挿入する時に、屈曲外面が挿入溝５の上方エッジ部に当たって滑らかに滑って挿入し易くするために設けられる。元部６１の内周面と挿入溝５の間には、弾性を有する環状部材７、（本例ではＥＰＤＭ（エチレンプロピレンジエンターポリマー）製のＯリング）が挿着されている。 The base portion 61 of the compression ring 6 is bent toward the tube axis side. This bending is provided so that when the compression ring 6 is inserted into the insertion groove, the outer surface of the bending hits the upper edge portion of the insertion groove 5 so that it can slide smoothly. An elastic annular member 7 (in this example, an O-ring made of EPDM (ethylene propylene diene terpolymer)) is inserted between the inner peripheral surface of the base portion 61 and the insertion groove 5.

元部６１の外径は、挿入溝５の外周側壁の内径より僅かに広くされ、圧縮リング６外周面と挿入溝５壁面とは摩擦力が働き、抜け難くなっている。図１の継手１においては、上記の摩擦力に加え、挿着された環状部材７によって圧縮部材６の元部６１が更に強く挿入溝５の外周側溝壁に圧迫されることにより、摩擦力が増大して抜け難くなる。 The outer diameter of the base portion 61 is slightly wider than the inner diameter of the outer peripheral side wall of the insertion groove 5, and a frictional force acts between the outer peripheral surface of the compression ring 6 and the wall surface of the insertion groove 5, making it difficult to come off. In the joint 1 of FIG. 1, in addition to the above frictional force, the base 61 of the compression member 6 is further strongly pressed against the outer peripheral groove wall of the insertion groove 5 by the inserted annular member 7, so that the frictional force is increased. It becomes difficult to increase.

弾性を有する環状部材は環状であれば良く、その断面形状は特に限定されない。例えば図２（ａ）、図２（ｂ）に示されるように断面形状が円形、または矩形であっても良い。 The annular member having elasticity may be an annular member, and the cross-sectional shape is not particularly limited. For example, as shown in FIGS. 2A and 2B, the cross-sectional shape may be circular or rectangular.

図３の配管用圧縮継手においては、圧縮リング挿入溝５に突条環５１が設けられている。突条環５１は挿入溝５の管軸側内周壁に沿って設けられている。従って、挿入溝５底面の溝幅が、突条環５１の外周側側壁によって狭くされたことになる。 In the compression joint for piping of FIG. 3, a protrusion ring 51 is provided in the compression ring insertion groove 5. The protruding ring 51 is provided along the inner peripheral wall of the insertion groove 5 on the tube axis side. Therefore, the groove width on the bottom surface of the insertion groove 5 is narrowed by the outer peripheral side wall of the ridge ring 51.

狭くされた溝幅は、圧縮リング６が挿入溝５に挿入可能で、かつ圧縮リング６の元部６１の上面投影幅よりも狭くされている。従って、圧縮リング６外周面と挿入溝５壁との間の摩擦力が増大することに加え、圧縮リング６の屈曲側端部が突条環５１の側壁に圧接された摩擦力が加わり、抜け難くなる。 The narrowed groove width is narrower than the projected width of the upper surface of the base 61 of the compression ring 6 so that the compression ring 6 can be inserted into the insertion groove 5. Accordingly, the frictional force between the outer peripheral surface of the compression ring 6 and the wall of the insertion groove 5 is increased, and the frictional force in which the bent side end portion of the compression ring 6 is pressed against the side wall of the protrusion ring 51 is applied, and the removal It becomes difficult.

なお、突条環の、挿入溝底面から管軸方向への高さが、接続部２に差し込まれた複合管の金属層（アルミニウム層）に接触しない高さとされていると、異種金属同士が接触して発生する電食は起こらない。 If the height of the ridge ring from the bottom surface of the insertion groove in the tube axis direction is such that it does not contact the metal layer (aluminum layer) of the composite tube inserted into the connecting portion 2, There is no electric corrosion caused by contact.

図４の配管圧縮継手においては、圧縮リング６の元部６１の屈曲部が、平面投影寸幅で挿入溝５の溝幅より大きくなるようにされている。従って、圧縮リング６の元部６１を挿入溝５に挿入したら、圧縮リング６外周面と挿入溝５壁との間の摩擦力が増大することに加え、圧縮リング６の屈曲側端部が突条環５１の側壁に圧接された摩擦力が加わり、抜け難くなる。この場合も、複合管Ｐの端面が突き当たり壁３に当たるので、複合管Ｐの端面に露出している、中間層として積層されている金属層（アルミニウム層）Ａは、圧縮継手１に接触しないので、電食は起こらない。 In the pipe compression joint of FIG. 4, the bent portion of the base portion 61 of the compression ring 6 is made larger than the groove width of the insertion groove 5 in a plane projection dimension width. Therefore, when the base portion 61 of the compression ring 6 is inserted into the insertion groove 5, the frictional force between the outer peripheral surface of the compression ring 6 and the wall of the insertion groove 5 increases, and the bent side end of the compression ring 6 protrudes. The frictional force pressed against the side wall of the strip ring 51 is applied, and it becomes difficult to come off. Also in this case, since the end face of the composite pipe P hits the abutting wall 3, the metal layer (aluminum layer) A exposed as the intermediate layer exposed on the end face of the composite pipe P does not contact the compression joint 1. , Electric corrosion does not occur.

実施例１として、図１に示す圧縮継手を用い、圧縮リング内周面と挿入溝内側壁とのクリアランスを１．１５ｍｍとした。環状部材として、図２（ａ）に示す、断面形状が線径１．３０ｍｍの円形のＥＰＤＭ製リングを用い、ゴムの圧縮率が１５％となるようにした。 As Example 1, the compression joint shown in FIG. 1 was used, and the clearance between the inner peripheral surface of the compression ring and the inner wall of the insertion groove was 1.15 mm. As the annular member, a circular EPDM ring having a cross-sectional shape with a wire diameter of 1.30 mm shown in FIG. 2A was used, and the compression ratio of rubber was 15%.

この圧縮継手の、圧縮リングの挿入溝からの引き抜き抵抗力を測定した。引き抜き抵抗力は、引っ張り試験機（島津製作所社製、テンシロン、モデルＵＴＡ−５０ＫＮ）の下部治具に圧縮継手のねじ部を固定し、上部治具に圧縮リングの上部鍔部を掛け、引っ張り速度５０ｍｍ／ｍｉｎで上部治具を上方に引き、ロードセルで引き抜き抵抗力を測定した。 The pulling resistance force of the compression joint from the insertion groove of the compression ring was measured. The pulling resistance is determined by fixing the compression joint thread to the lower jig of the tensile tester (Shimadzu Corporation, Tensilon, model UTA-50KN), and hung the upper collar of the compression ring on the upper jig. The upper jig was pulled upward at 50 mm / min, and the pulling resistance was measured with a load cell.

実施例２として、環状部材として、図２（ｂ）に示す、断面が一辺１．３０ｍｍの矩形のＥＰＤＭ製Ｏリングを用いた以外は実施例１と同様して、引き抜き抵抗力を測定した。 As Example 2, the pulling resistance was measured in the same manner as in Example 1 except that a rectangular EPDM O-ring having a side of 1.30 mm shown in FIG. 2B was used as the annular member.

実施例３として、図３に示す圧縮継手において、突条環を挿入溝の全周に渡って設けたものを用いた。圧縮リング元部の平面投影幅を２．４１ｍｍとし、突条環壁と挿入溝外側壁とのクリアランスを１．８４５ｍｍとした。この圧縮継手の、圧縮リングの挿入溝からの引き抜き抵抗力を、実施例１と同様に測定した。 As Example 3, the compression joint shown in FIG. 3 was used in which the ridge ring was provided over the entire circumference of the insertion groove. The plane projection width of the compression ring base part was 2.41 mm, and the clearance between the rib ring wall and the insertion groove outer wall was 1.845 mm. The resistance to pulling out of the compression joint from the insertion groove of the compression ring was measured in the same manner as in Example 1.

実施例４として、突条環を四分割して挿入溝に均等な間隔で設けたものを用いた。突条環の合計長さは、挿入溝全周長さの１／２とした。この圧縮継手の、圧縮リングの挿入溝からの引き抜き抵抗力を、実施例１と同様に測定した。 As Example 4, the protrusion ring was divided into four parts and provided in the insertion groove at equal intervals. The total length of the ridge ring was set to ½ of the entire length of the insertion groove. The resistance to pulling out of the compression joint from the insertion groove of the compression ring was measured in the same manner as in Example 1.

実施例５として、図４に示す圧縮継手において、圧縮リング元部の平面投影幅を２．４１ｍｍとし、挿入溝の幅を１．８４５ｍｍとした。この圧縮継手の、圧縮リングの挿入溝からの引き抜き抵抗力を、実施例１と同様に測定した。 As Example 5, in the compression joint shown in FIG. 4, the plane projection width of the compression ring base part was 2.41 mm, and the width of the insertion groove was 1.845 mm. The resistance to pulling out of the compression joint from the insertion groove of the compression ring was measured in the same manner as in Example 1.

比較のために行った実施した例（以降、比較例という。）として、環状部材を用いず、突条環を設けない従来の圧縮継手を用いて、実施例１と同様にして圧縮リングの引き抜き抵抗力を測定した。 As an example carried out for comparison (hereinafter referred to as a comparative example), a compression ring is pulled out in the same manner as in Example 1 using a conventional compression joint that does not use an annular member and does not have a protruding ring. Resistance was measured.

実施例及び比較例における引き抜き抵抗力を表１に示す。実施例１、２においては、いずれも比較例と比べて４倍以上の引き抜き抵抗があり、実施例３、４、５においては、いずれも３０％以上の引き抜き抵抗力の向上が見られた。 Table 1 shows the pulling resistance in Examples and Comparative Examples. In each of Examples 1 and 2, the pulling resistance was four times or more that of the comparative example, and in each of Examples 3, 4, and 5, the pulling resistance was improved by 30% or more.

発明１の配管用圧縮継手の一例の断面図である。It is sectional drawing of an example of the compression joint for piping of invention 1. 環状部材の一例であり（ａ）は断面形状が円形であるものの一例の断面図、（ｂ）は断面形状が矩形であるものの一例の断面図である。It is an example of an annular member, (a) is a sectional view of an example of a section having a circular shape, and (b) is a sectional view of an example of a section having a rectangular shape. 発明３の配管用圧縮継手の一例の断面図である。It is sectional drawing of an example of the compression joint for piping of the invention 3. 発明５の配管用圧縮継手の一例の断面図である。It is sectional drawing of an example of the compression joint for piping of the invention 5. 従来の配管用圧縮継手の断面図である。It is sectional drawing of the conventional compression joint for piping.

符号の説明Explanation of symbols

１圧縮継手
２管接続部
３突き当たり壁
４止水パッキン
５圧縮リング挿入溝
５１突条環
６圧縮リング
６１元部（屈曲側端部）
７環状部材
Ｐ被接続管（複合管）
Ａ金属層（アルミニウム層） DESCRIPTION OF SYMBOLS 1 Compression joint 2 Pipe connection part 3 Butting wall 4 Water stop packing 5 Compression ring insertion groove 51 Projection ring 6 Compression ring 61 Original part (bending side edge part)
7 Ring member P Connected pipe (composite pipe)
A metal layer (aluminum layer)

Claims

継手本体と本体を覆って設けられる圧縮リングとの隙間に金属複合樹脂管を挿入し、圧縮リングを圧縮変形させることで、複合樹脂管を継手本体に圧接して接続する管継手であって、
該圧縮リングの元部が管継手側に屈曲され、圧縮リングの屈曲部側端部が継手本体奥側の圧縮リング挿入溝に挿入され、圧縮リングの屈曲部内周面と挿入溝壁面との間に、弾性体からなる環状部材が押し込まれていることを特徴とする配管用圧縮継手。 A pipe joint that presses and connects the composite resin pipe to the joint body by inserting a metal composite resin pipe into the gap between the joint body and the compression ring provided covering the body, and compressing and deforming the compression ring,
The base of the compression ring is bent to the pipe joint side, the end of the compression ring is inserted into the compression ring insertion groove on the back side of the joint body, and the space between the inner peripheral surface of the bending part of the compression ring and the wall surface of the insertion groove An annular member made of an elastic body is pushed into the compression joint for piping.

環状部材が電気絶縁性を有することを特徴とする請求項１記載の配管用圧縮継手。 2. The compression joint for piping according to claim 1, wherein the annular member has electrical insulation.

継手本体と本体を覆って設けられる圧縮リングとの隙間に金属複合樹脂管を挿入し、圧縮リングを圧縮変形させることで、複合樹脂管を継手本体に圧接して接続する管継手であって、
該圧縮リングの元部が管継手側に屈曲され、該継手本体奥側の圧縮リング挿入溝の管軸側底面と側壁とに掛けて、断面矩形の突条環が設けられ、上記挿入溝の管軸外側壁と突条環の管軸外側壁との隙間の長さが、上記圧縮リングの屈曲部の平面投影幅と略同じで僅かに小さくされていることを特徴とする配管用圧縮継手。 A pipe joint that presses and connects the composite resin pipe to the joint body by inserting a metal composite resin pipe into the gap between the joint body and the compression ring provided covering the body, and compressing and deforming the compression ring,
A base portion of the compression ring is bent toward the pipe joint side, and a ridge ring having a rectangular cross section is provided on the pipe shaft bottom surface and the side wall of the compression ring insertion groove on the back side of the joint body. A compression joint for pipes, wherein the length of the gap between the outer wall of the tube shaft and the outer wall of the tube ring is substantially the same as the projected width of the bent portion of the compression ring and is slightly smaller .

突条環の溝底面から管軸方向への高さが、上記金属複合樹脂管中の金属層に接触しない高さとされていることを特徴とする請求項３の配管用圧縮継手。 4. The compression joint for piping according to claim 3, wherein the height of the rib ring from the groove bottom surface in the tube axis direction is set so as not to contact the metal layer in the metal composite resin tube.

継手本体と本体を覆って設けられる圧縮リングとの隙間に金属複合樹脂管を挿入し、圧縮リングを圧縮変形させることで、複合樹脂管を継手本体に圧接して接続する管継手であって、
該圧縮リングの元部が管継手側に屈曲され、圧縮リングの屈曲部の平面投影幅が、上記継手の圧縮リング層入溝の溝幅と略同じで僅かに大きくされていることを特徴とする配管用圧縮継手。
A pipe joint that presses and connects the composite resin pipe to the joint body by inserting a metal composite resin pipe into the gap between the joint body and the compression ring provided covering the body, and compressing and deforming the compression ring,
The base portion of the compression ring is bent toward the pipe joint, and the planar projection width of the bending portion of the compression ring is substantially the same as the groove width of the compression ring layer insertion groove of the joint, and is slightly increased. Compression joint for piping.