JP4585714B2

JP4585714B2 - End structure of the pipe inserted into the plug-in type fitting

Info

Publication number: JP4585714B2
Application number: JP2001196193A
Authority: JP
Inventors: 正親井上; 章尋陣川
Original assignee: JFE Pipe Fitting Mfg Co Ltd
Current assignee: JFE Pipe Fitting Mfg Co Ltd
Priority date: 2001-06-28
Filing date: 2001-06-28
Publication date: 2010-11-24
Anticipated expiration: 2021-06-28
Also published as: JP2003014169A

Description

【０００１】
【発明の属する技術分野】
本発明は、差込み式管継手に差込み接続される給水・給湯用配管等の管の端部構造の改良に係り、より詳しくは管が差込み不足の場合も管抜けを防止できるようにした管の端部構造に関する。
【０００２】
【従来の技術】
この種の差込み式管継手として、例えば、図５に示すようなものが提案されている。そこでは、筒状の継手本体１０の軸心方向両端に管２の端部が差し込まれる受口１３，１３を開口し、この受口１３の内周面に管抜出方向に窄まり状のテ−パ面１８を形成し、受口１３の内奥部内周には管端ストッパー部１４を設けている。継手本体１０の受口１３の内部には拡縮径自在なロックリング１２と、このロックリング１２より内奥側に配されるゴム製のシールリング１１とが組み込まれている。一方、この管継手で接続される薄肉ステンレス鋼管など管２の端部の外面には施工確認用のチェックライン３１を設けるとともに、このチェックライン３１より端部末端寄り側の外面に前記ロックリング１２に係合させるための抜止溝３２を円周方向に設けている。
【０００３】
この差込み式管継手では、一旦、図５に示すごとく受口１３に対し管２の端部が、抜止溝３２がロックリング１２の位置を越えるとともにチェックライン３１が受口１３内に入るように管端ストッパー部１４に突き当たるまで差し込まれ、しかる後、図６に示すように、管２が少し引き戻されると、ロックリング１２がテ−パ面１８との当接により縮径作用を受けて抜止溝３２に係合することにより管２の抜止め機能が確保されるというものである。
【０００４】
上記差込み式管継手において、管２の接続施工に際し、継手本体１０の受口１３に管２の端部を差し込んで管端ストッパー部１４に突き当てて差込みを止め、施工を終えるが、このとき管２の抜止溝３２にロックリング１２が係合しているどうかの差込み状態の良否の確認は、一旦前述のように差込まれた管２を、手で少し引き戻し、この引戻しにより図６に示すごとくチェックライン３１が受口１３から出て見えれば、施工良好と判断する方法がとられていた。
【０００５】
【発明が解決しようとする課題】
しかるに、チェックライン３１により管２の差込み施工の良否を確認する上記差込み式管継手では、その確認の確実性を欠く。すなわち、管Ｐの差込みを図７に示すごとく途中（抜止溝３２がロックリング１２に達する手前）で止めた場合、既に抜止溝３２がロックリング１２の位置を越えた後引き戻されたものとの区別がつかず、このため図７に示すごとく管２が差込み不足でロックリング１２が抜止溝３２に係合しないままにされることがあり、これを確認することは困難であった。管２の差込みを途中で止めた場合は管２が差込み不足でロックリング１２が抜止溝３２に係合されないままになるため、管２の抜出し事故を引き起こすという問題があった。
【０００６】
本発明の目的は、このような問題を解決するためになされたもので、管が差込み不足である場合も管の抜止め機能を確保できる、差込み式管継手に差し込まれる管の端部構造を提供することにある。
【０００７】
【課題を解決するための手段】
本発明は、差込み式管継手が、継手本体の端部に受口を開口するとともに、この受口の内奥部内周に管端ストッパー部を設けており、前記受口の内部には拡縮径自在なロックリングと、このロックリングと前記管端ストッパー部との間に配置されるシールリングとを組み込んでおり、前記ロックリングの内接する受口の内周には、前記ロックリングに縮径方向の力を作用させるテ−パ面を管抜出方向に窄まり状に設けており、前記受口に差し込まれる管の端部の外面には、該管がこれの末端部を前記管端ストッパー部に当接するまで差込まれた後少し引き戻されるに伴い前記ロックリングに係合する第１の抜止溝を設けてある、差込み式管継手に差し込まれる管の端部構造において、前記管の端部の外面上の第１の抜止溝と末端部との間の中間位置に、もう一つもしくは二つ以上の第２の抜止溝を設けていることに特徴を有するものである。
この場合において、前記管の端部の外面上の、前記第１の抜止溝より管抜出方向に偏した位置に、管がこれの端部の末端部を前記管端ストッパー部に当接させるまで差し込まれたとき前記受口の開口端面より僅かに内部に位置するチェックラインを設けることができる。
【０００８】
【作用】
管の接続に際し、継手本体の受口に管の端部を第１の抜止溝がロックリングを乗り越えて管の末端部が管端ストッパー部に当るまで差し込み、この差込み後管を少し引き戻すと、この引戻し途上でテ−パ面で縮径作用を受けるロックリングが第１の抜止溝にはまり係合するので、管の抜止め機能を確保できる。
その際、管の差込みが、不用意に、第１の抜止溝がロックリングに達する手前に位置しかつ第２の抜止溝（第２の抜止溝が二つ以上設けられている場合は少なくとも一つの第２の抜止溝）がロックリングを乗り越えて止められてしまうという差込み不足のまま終えられた場合も、この差込み後管を少し引き戻すと、この引戻し途上でテ−パ面で縮径作用を受けるロックリングが第２の抜止溝にはまり係合するので、管の抜出しを防止できる。
【０００９】
管の端部にチェックラインが設けられている場合は、管がこれの末端部を管端ストッパー部に当接するまで差し込まれたとき、チェックラインが受口の開口端面より僅かに内部に位置するので、これを目で確認することにより管が最も深く差し込まれたことを容易に知ることができる。
【００１０】
【発明の実施の形態】
本発明の好適な実施例を図面に基づき説明する。図１は管が差込み式管継手に最も深く差し込まれた時の状態を示す半欠截断面図、図２は図１の管が差込み式管継手に抜止め状態に差込み終えられた時の状態を示す一部断面図、図３は管が差込み式管継手に差込み不足状態に差し込まれた時の状態を示す半欠截断面図、図４は管が差込み式管継手に差込み不足状態に差し込まれた時における抜止め状態を示す半欠截断面図である。
【００１１】
図１において、１は差込み式管継手、２は差込み式管継手１により接続される管である。差込み式管継手１は、継手本体１０、内周に襞状片１１ａを有するゴム製のシールリング１１、および内周にエッジ部１２ａを有する金属製の拡縮径自在なロックリング１２などにより構成される。
【００１２】
継手本体１０は筒状に形成され、これの軸心方向両端部に管２の端部が差し込まれる受口１３，１３を開口し、軸心方向中央付近の内周に管２の外径より小さい内径の環状の管端ストッパー部１４を設け、かつ管端ストッパー部１４より管抜出方向に位置する部位の内周にシールリング収容用凹溝１５を形成するとともに、この凹溝１５より更に管抜出方向に位置する部位の内周に環状壁１６を介してロックリング収容用凹溝１７を形成し、この凹溝１７の内周面に管抜出方向に窄まり状のテ−パ面１８を形成している。継手本体１０のシールリング収容用凹溝１５には前記シールリング１１が、ロックリング収容用凹溝１７に前記ロックリング１２がそれぞれ嵌め込まれる。
【００１３】
一方、管２は薄肉ステンレス鋼管等からなり、その端部の外面に、末端部２０から順に一つもしくは二つ以上（図示例では一つ）の第２の抜止溝２１、第１の抜止溝２２、チェックライン２３をそれぞれ円周方向に設けている。図１に示すように、第１の抜止溝２２は、管２がこれの末端部２０を管端ストッパー部１４に当接するまで差し込まれたときロックリング１２を乗り越える位置に存するように位置設定される。チェックライン２３は、管２がこれの末端部２０を管端ストッパー部１４に当接するまで差し込まれたとき受口１３の開口端面より僅かに内部に位置するように位置設定される。チェックライン２３は溝付け以外に、マジック等で標示線をマーキングするもよい。
【００１４】
上記構成の管２を差込み式管継手１に接続するには、図１に示すように、継手本体１０の受口１３に管２の端部をチェックライン２３が受口１３の開口端面より僅かに内部に入るまで差し込むと、第１の抜止溝２２がロックリング１２の位置を乗り越えて管２の末端部２０が管端ストッパー部１４に当るまで差し込まれたことになる。この差込み後、図２に示すごとく管２を少し引き戻すと、この引戻し途上でテ−パ面１８で縮径作用を受けるロックリング１２が第１の抜止溝２２にはまり係合して管２の引抜き阻止機能を確保する。この管２の抜止め状態と同時に、管２の端部の外周面にシールリング１１が圧縮状に密接することにより受口１３の内周面と管２の端部外周面との間のシール状態が得られる。
【００１５】
管２の差し込みに際し、図３に示すように、第１の抜止溝２２がロックリング１２に達する手前に位置しかつ第２の抜止溝２１（第２の抜止溝２１が二つ以上設けられている場合は少なくとも一つの第２の抜止溝２１）がロックリング１２を乗り越えて止められるといった差し込み不足状態のままで差し込み操作が不用意に終えられることがある。こうした差込み不足の場合も、この差込み後、図４に示すごとく管２を少し引き戻すと、この引戻し途上でテ−パ面１８で縮径作用を受けるロックリング１２が第２の抜止溝２１にはまり係合するため、このときも管２の抜止め機能を確保することができる。
なお、上記実施例においては継手本体１の他端部の受口１３にも同様に別の管２の端部が差し込まれる。
【００１６】
因みに、施工後、地震などにより管２が更に抜出し方向に強く引っ張られるようなことがあっても、管２と共に同一方向に移動するロックリング１２の外周面がテ−パ面１８によりロックリング１２が更に縮径して第１の抜止溝２２または第２の抜止溝２１への食込みが増すことになるため、管２の端部が受口１３から抜け出るのを確実に阻止できる。
【００１７】
【発明の効果】
本発明によれば、管の端部に第１の抜止溝のほかに更に第２の抜止溝を設けるという簡単な手段で、管が差込み不足の場合も管の抜止め機能を確保できるという利点がある。
【図面の簡単な説明】
【図１】管が差込み式管継手に最も深く差し込まれた時の状態を示す半欠截断面図である。
【図２】管が差込み式管継手に抜止め状態に差し込み終えられた時の状態を示す一部断面図である。
【図３】管が差込み式管継手に差込み不足状態に差し込まれた時の状態を示す半欠截断面図である。
【図４】管が差込み式管継手に差込み不足状態に差し込まれた時における抜止め状態を示す半欠截断面図である。
【図５】従来例の管を差込み式管継手に最も深く差込んだ時の状態の半欠截断面図である。
【図６】図５の管を差込み式管継手に抜止め状態に差込み終えた時の状態の一部断面図である。
【図７】図５の管を差込み式管継手に差込み不足状態に差し込まれた状態を示す一部断面図である。
【符号の説明】
１差込み式管継手
２管
１０継手本体
１１シールリング
１２ロックリング
１３受口
１４管端ストッパー部
１８テ−パ面
２０末端部
２１第２の抜止溝
２２第１の抜止溝
２３チェックライン[0001]
BACKGROUND OF THE INVENTION
The present invention relates to improvements in the end structure of pipes such as water supply and hot water supply pipes that are plugged into and connected to plug-in type pipe joints. More specifically, the present invention relates to a pipe that can prevent pipe dropout even when the pipe is insufficiently inserted. It relates to the end structure.
[0002]
[Prior art]
As this type of plug-in type pipe joint, for example, the one shown in FIG. 5 has been proposed. In this case, the receiving ports 13 and 13 into which the end portions of the pipe 2 are inserted are opened at both axial ends of the tubular joint body 10, and the inner peripheral surface of the receiving port 13 is constricted in the tube extracting direction. A taper surface 18 is formed, and a tube end stopper portion 14 is provided on the inner periphery of the inner portion of the receiving port 13. A lock ring 12 that can be expanded and contracted and a rubber seal ring 11 that is disposed on the inner and inner sides of the lock ring 12 are incorporated in the inside of the receiving port 13 of the joint body 10. On the other hand, a check line 31 for construction confirmation is provided on the outer surface of the end of the pipe 2 such as a thin stainless steel pipe connected by this pipe joint, and the lock ring 12 is provided on the outer surface closer to the end of the end than the check line 31. A retaining groove 32 is provided in the circumferential direction to be engaged with each other.
[0003]
In this plug-in type pipe joint, as shown in FIG. 5, the end of the pipe 2 is temporarily positioned with respect to the receiving port 13 so that the retaining groove 32 exceeds the position of the lock ring 12 and the check line 31 enters the receiving port 13. As shown in FIG. 6, when the tube 2 is pulled back a little, the lock ring 12 is reduced in diameter due to the contact with the taper surface 18 to prevent the tube end stopper 14 from coming into contact. By engaging with the groove 32, the retaining function of the tube 2 is ensured.
[0004]
In the above plug-in type pipe joint, when connecting the pipe 2, the end of the pipe 2 is inserted into the receiving port 13 of the joint body 10 and abuts against the pipe end stopper portion 14 to stop the insertion. Whether the lock ring 12 is engaged with the retaining groove 32 of the tube 2 or not can be confirmed by pulling the tube 2 once inserted as described above slightly by hand. If the check line 31 is visible from the receiving port 13 as shown, a method of judging that the construction is good has been taken.
[0005]
[Problems to be solved by the invention]
However, the plug-in type pipe joint for confirming the quality of the insertion work of the pipe 2 by the check line 31 lacks certainty of confirmation. That is, when the insertion of the pipe P is stopped halfway as shown in FIG. 7 (before the retaining groove 32 reaches the lock ring 12), the retaining groove 32 has already been pulled back after exceeding the position of the lock ring 12. Therefore, as shown in FIG. 7, the tube 2 may be insufficiently inserted and the lock ring 12 may be left unengaged with the retaining groove 32, which is difficult to confirm. When the insertion of the tube 2 is stopped halfway, the tube 2 is insufficiently inserted and the lock ring 12 remains unengaged with the retaining groove 32, which causes a problem of causing the tube 2 to be pulled out.
[0006]
An object of the present invention is to solve such a problem, and an end structure of a pipe inserted into a plug-in type pipe joint that can secure a function of preventing the pipe from being inserted even when the pipe is insufficiently inserted. It is to provide.
[0007]
[Means for Solving the Problems]
According to the present invention, the plug-in type pipe joint has an opening at the end of the joint main body, and a pipe end stopper is provided at the inner periphery of the receiving opening. A lock ring, and a seal ring disposed between the lock ring and the pipe end stopper, and a diameter of the lock ring is reduced on an inner periphery of a receiving port in contact with the lock ring. A taper surface for applying a force in the direction is provided so as to be constricted in the tube extraction direction, and on the outer surface of the end of the tube inserted into the receiving port, the end of the tube is connected to the end of the tube. In the end structure of the pipe inserted into the plug-in type pipe joint, provided with a first retaining groove that engages with the lock ring as it is pulled back a little after being inserted into contact with the stopper part, Inside the first retaining groove on the outer surface of the end and the end In position, and it has the characteristics that is provided another or more than one second retaining groove.
In this case, the tube abuts the end portion of the end portion of the tube on the outer surface of the end portion of the tube in the tube extraction direction from the first retaining groove in contact with the tube end stopper portion. A check line located slightly inside the opening end face of the receiving port can be provided.
[0008]
[Action]
When connecting the pipe, insert the end of the pipe into the receiving port of the joint body until the first retaining groove crosses the lock ring and the end of the pipe hits the pipe end stopper, and after this insertion, pull the pipe back slightly. Since the lock ring that receives the diameter reducing action on the taper surface fits in and engages with the first retaining groove during the pulling back, the retaining function of the tube can be secured.
At that time, the insertion of the pipe is inadvertently positioned before the first retaining groove reaches the lock ring, and at least one second retaining groove (when two or more second retaining grooves are provided). When the tube is pulled back slightly after the insertion, the diameter of the taper surface is reduced on the taper surface when the tube is pulled back slightly. Since the lock ring to be received fits in and engages with the second retaining groove, the tube can be prevented from being pulled out.
[0009]
When a check line is provided at the end of the tube, the check line is positioned slightly inside the opening end surface of the receiving port when the tube is inserted until the end of the tube is in contact with the tube end stopper. Therefore, it is possible to easily know that the tube has been inserted most deeply by checking this visually.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a half cutaway cross-sectional view showing a state when the pipe is inserted into the plug-in pipe joint most deeply, and FIG. 2 is a state when the pipe of FIG. 1 is completely inserted into the plug-in pipe joint. FIG. 3 is a partial cross-sectional view showing a state where the pipe is inserted into the insertion-type pipe joint in an insufficiently inserted state, and FIG. 4 is a state where the pipe is inserted into the insertion-type pipe joint in an insufficiently inserted state. FIG.
[0011]
In FIG. 1, 1 is a plug-in type pipe joint, and 2 is a pipe connected by a plug-in type pipe joint 1. The plug-in type pipe joint 1 includes a joint body 10, a rubber seal ring 11 having a flange-like piece 11a on the inner periphery, and a metal expandable / retractable lock ring 12 having an edge portion 12a on the inner periphery. The
[0012]
The joint body 10 is formed in a cylindrical shape, and the receiving ports 13 and 13 into which the end portions of the pipe 2 are inserted are opened at both ends in the axial direction of the joint main body 10. An annular tube end stopper portion 14 having a small inner diameter is provided, and a seal ring accommodating groove 15 is formed on the inner periphery of a portion located in the tube extraction direction from the tube end stopper portion 14. A lock-ring accommodating groove 17 is formed on the inner periphery of the portion located in the tube extraction direction via an annular wall 16, and a taper taper in the tube extraction direction on the inner peripheral surface of the groove 17. A surface 18 is formed. The seal ring 11 is fitted in the groove 15 for accommodating the seal ring of the joint body 10, and the lock ring 12 is fitted in the groove 17 for accommodating the lock ring.
[0013]
On the other hand, the pipe 2 is made of a thin stainless steel pipe or the like, and one or more (one in the illustrated example) second retaining groove 21 and first retaining groove are formed on the outer surface of the end portion in order from the end portion 20. 22 and check line 23 are provided in the circumferential direction. As shown in FIG. 1, the first retaining groove 22 is positioned so as to be positioned over the lock ring 12 when the tube 2 is inserted until the distal end portion 20 of the tube 2 comes into contact with the tube end stopper portion 14. The The check line 23 is positioned so as to be positioned slightly inside the opening end surface of the receiving port 13 when the tube 2 is inserted until the end portion 20 of the tube 2 is brought into contact with the tube end stopper portion 14. In addition to grooving, the check line 23 may mark a marking line with a magic or the like.
[0014]
In order to connect the pipe 2 configured as described above to the plug-in type pipe joint 1, as shown in FIG. 1, the end of the pipe 2 is connected to the receiving port 13 of the joint body 10, and the check line 23 is slightly from the opening end surface of the receiving port 13. When it is inserted to the inside, the first retaining groove 22 gets over the position of the lock ring 12 and is inserted until the end portion 20 of the pipe 2 hits the pipe end stopper section 14. After this insertion, when the tube 2 is pulled back slightly as shown in FIG. 2, the lock ring 12 that receives the diameter reducing action on the taper surface 18 in the course of this pulling is fitted into the first retaining groove 22 and engaged. Secure the pull-out prevention function. Simultaneously with the retaining state of the tube 2, the seal ring 11 is compressed and brought into close contact with the outer peripheral surface of the end portion of the tube 2, thereby sealing between the inner peripheral surface of the receiving port 13 and the outer peripheral surface of the end portion of the tube 2. A state is obtained.
[0015]
When the tube 2 is inserted, as shown in FIG. 3, the first retaining groove 22 is positioned just before reaching the lock ring 12 and the second retaining groove 21 (two or more second retaining grooves 21 are provided. In such a case, the insertion operation may be inadvertently terminated in a state where the insertion is insufficient such that at least one second retaining groove 21) gets over the lock ring 12 and is stopped. Even in such a case where the insertion is insufficient, after the insertion, when the tube 2 is pulled back slightly as shown in FIG. 4, the lock ring 12 that receives the diameter reducing action on the taper surface 18 is fitted in the second retaining groove 21 in the course of the withdrawal. Because of the engagement, the retaining function of the tube 2 can be secured at this time as well.
In addition, in the said Example, the edge part of another pipe | tube 2 is similarly inserted in the receptacle 13 of the other end part of the coupling main body 1. FIG.
[0016]
Incidentally, even after the construction, even if the tube 2 is further pulled in the pulling-out direction due to an earthquake or the like, the outer peripheral surface of the lock ring 12 that moves in the same direction together with the tube 2 is moved by the taper surface 18 to the lock ring 12. However, the diameter of the pipe 2 is further reduced, and the biting into the first retaining groove 22 or the second retaining groove 21 is increased, so that the end portion of the pipe 2 can be reliably prevented from coming out of the receiving port 13.
[0017]
【The invention's effect】
According to the present invention, a simple means that a second retaining groove is provided in addition to the first retaining groove at the end of the tube, so that the retaining function of the tube can be secured even when the tube is insufficiently inserted. There is.
[Brief description of the drawings]
FIG. 1 is a half cutaway cross-sectional view showing a state when a pipe is inserted deepest into a plug-in type pipe joint.
FIG. 2 is a partial cross-sectional view showing a state when the pipe is completely inserted into the insertion-type pipe joint in a retaining state.
FIG. 3 is a half cutaway cross-sectional view showing a state in which a pipe is inserted into an insertion-type pipe joint in an insufficiently inserted state.
FIG. 4 is a half-broken cross-sectional view showing a state where the pipe is prevented from being pulled out when the pipe is inserted into the insertion-type pipe joint in an insufficiently inserted state.
FIG. 5 is a cross-sectional view of a half-notched state in a state where a conventional pipe is most deeply inserted into an insertion-type pipe joint.
6 is a partial cross-sectional view of a state in which the pipe of FIG.
7 is a partial cross-sectional view showing a state in which the pipe of FIG. 5 is inserted into an insertion-type pipe joint in an insufficiently inserted state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Plug-in type pipe joint 2 Pipe 10 Joint main body 11 Seal ring 12 Lock ring 13 Receptacle 14 Pipe end stopper part 18 Taper surface 20 End part 21 2nd retaining groove 22 1st retaining groove 23 Check line

Claims

The plug-in pipe joint has a receiving opening at the end of the fitting body, and a pipe end stopper is provided at the inner periphery of the receiving opening. And a seal ring disposed between the lock ring and the pipe end stopper portion, and a force in the diameter reducing direction is applied to the lock ring on the inner periphery of the receiving port inscribed in the lock ring. The taper surface to be actuated is formed in a constricted shape in the tube extraction direction. The outer surface of the end of the tube to be inserted into the receiving port is contacted with the end of the tube by the tube end stopper. In the end structure of the pipe inserted into the plug-in type pipe joint, provided with a first retaining groove that engages with the lock ring as it is pulled back a little after being inserted until contact,
One or more second retaining grooves are provided at an intermediate position between the first retaining groove and the end portion on the outer surface of the end portion of the tube. End structure of the pipe that is inserted into the joint.

When the tube is inserted into a position on the outer surface of the end portion of the tube that is offset in the tube extraction direction from the first retaining groove until the end portion of this end abuts the tube end stopper portion. The end structure of the pipe inserted into the plug-in type pipe joint according to claim 1, wherein a check line located slightly inside the opening end face of the receiving port is provided.