JP2007170630A - Check valve mounting structure - Google Patents

Check valve mounting structure Download PDF

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JP2007170630A
JP2007170630A JP2005372561A JP2005372561A JP2007170630A JP 2007170630 A JP2007170630 A JP 2007170630A JP 2005372561 A JP2005372561 A JP 2005372561A JP 2005372561 A JP2005372561 A JP 2005372561A JP 2007170630 A JP2007170630 A JP 2007170630A
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check valve
pipe
fixed
tube
valve unit
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Kazuo Ishikawa
和夫 石川
Takeshi Sakamoto
武司 坂本
Daisuke Okada
大輔 岡田
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Tabuchi Corp
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Tabuchi Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of a check valve capable of attaching the check valve to a halfway part of a pipe by simple work and taking out the check valve simply even at maintenance and replacement work time. <P>SOLUTION: This mounting structure of the check valve capable of attaching a cylindrical check valve unit 2 provided with the check valve 3 in the inside to the halfway part of the pipe so as to replace it is provided with a fixed pipe 4 mounted in an end part on one side of the check valve unit 2 in a crown manner and a storage pipe 5 attachable and detachable to/from the pipe and storing an end part on the other side of the check valve unit 2. The storage pipe 5 and the fixed pipe 4 can be mutually joined and fixed, and the check valve unit 2 is held on an inner side of the mutually fixed storage pipe 5 and fixed pipe 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、逆止弁を内部に備えた逆止弁ユニットを、配管の途中において交換可能に取り付ける逆止弁取付構造に関する。   The present invention relates to a check valve mounting structure for mounting a check valve unit having a check valve therein so that the check valve unit can be replaced in the middle of piping.

給水配管において水の逆流を防止することが重要視されるようになってきたため、例えば逆流防止機能を具備していない既設給水配管に対して新たに逆止弁を取り付けることが行われている。   Since it has become important to prevent the backflow of water in the water supply pipe, for example, a check valve is newly attached to an existing water supply pipe that does not have a backflow prevention function.

また、予め逆止弁が取り付けられている給水配管であっても、経年変化等によって逆流防止機能が低下するため、一定期間毎に逆止弁のメンテナンスや交換作業を行うことが必要である。   In addition, even in a water supply pipe to which a check valve is attached in advance, the check flow prevention function is deteriorated due to secular change or the like, and therefore it is necessary to perform check valve maintenance and replacement work at regular intervals.

従来、既設配管中に設けられた止水栓がユニオン（継手）を備えており、配管に対して比較的着脱のしやすい構造であるため、該止水栓を逆止弁付き止水栓と交換することにより、逆流防止機能を付与している。   Conventionally, a stop cock provided in an existing pipe is provided with a union (joint) and has a structure that is relatively easy to attach to and detach from the pipe. Therefore, the stop cock is connected to a stop cock with a check valve. By exchanging, a backflow prevention function is given.

ところで、既設給水配管に対する逆止弁の取付作業や交換作業を行う際には、なるべく簡単な作業とすることが望まれると共に、逆止弁の交換時にはなるべく交換対象となる部品を少なくすることが望まれる。   By the way, it is desirable to make the check valve as easy as possible when installing or replacing the check valve with respect to the existing water supply pipe, and when replacing the check valve, it is possible to reduce the number of parts to be replaced as much as possible. desired.

しかし、従来の逆止弁の取付構造は、止水栓若しくは伸縮ユニオン（伸縮継手）の内部に金属製の専用止め具を使用して逆止弁を封止する構造であるため、逆止弁だけを取り出すことが難しいという問題があった。そのため、逆止弁を交換する際には止水栓や伸縮ユニオンを逆止弁内蔵タイプのものに交換することになり、交換時の部品コストは逆止弁そのものの部品コストよりも高くなる。また従来、逆止弁だけを取り出してメンテナンスや交換作業を行う場合には、専用工具を使用して専用止め具を外す作業が必要になるが、その場合でも逆止弁を破損させずに取り出すことは極めて難しく、作業効率が著しく低下するという問題があった。   However, the conventional check valve mounting structure is a structure that seals the check valve using a metal stopper inside the stop cock or expansion / contraction union (expansion joint). There was a problem that it was difficult to take out only. Therefore, when the check valve is replaced, the stop cock or the expansion / contraction union is replaced with a check valve built-in type, and the part cost at the time of replacement becomes higher than the part cost of the check valve itself. Conventionally, when performing maintenance or replacement work with only the check valve taken out, it is necessary to remove the dedicated stop using a dedicated tool, but even in that case, take it out without damaging the check valve. This is extremely difficult, and there is a problem that work efficiency is remarkably lowered.

本発明は、上記従来の問題点を解決することを目的としてなされたものであり、配管の途中に対して簡単な作業で逆止弁を取り付けることができると共に、メンテナンスや交換作業時に極めて簡単に逆止弁の取り出しを行える逆止弁の取付構造を提供するものである。   The present invention has been made for the purpose of solving the above-mentioned conventional problems, and it is possible to attach a check valve to the middle of a pipe by a simple operation, and at the time of maintenance or replacement work is very simple. A check valve mounting structure capable of taking out the check valve is provided.

上記目的を達成するため、本発明が第一の解決手段として採用したところは、逆止弁を内部に備えた筒状の逆止弁ユニットを、配管の途中において交換可能に取り付ける逆止弁の取付構造であって、前記逆止弁ユニットの一方端部に冠着する固定管と、配管に対して着脱可能であり、前記逆止弁ユニットの他方端部を収容する収容管とを備え、前記収容管と前記固定管は互いに接合して固定可能とし、さらに前記逆止弁ユニットは互いに固定された前記収容管と前記固定管の内側に保持されるように構成した点にある。かかる構成によると、固定管を逆止弁ユニットの一方端部に冠着して、逆止弁ユニットの他方端部を収容管に挿入し、固定管と収容管を互いに接合することにより、逆止弁ユニットを固定管と収容管の内部に保持させ、その状態で収容管を配管に取り付けることにより、逆止弁を配管の途中に設けることができる。また、収容管を配管から取り外して固定管と収容管を分離すれば、その内側から逆止弁ユニットを破損することなく取り出すことができる。   In order to achieve the above object, the present invention adopts as a first solution means of a check valve which is mounted in a pipe in a replaceable manner in a cylindrical check valve unit having a check valve inside. An attachment structure, comprising a fixed pipe that attaches to one end of the check valve unit; and a housing pipe that is detachable from the pipe and accommodates the other end of the check valve unit; The receiving pipe and the fixed pipe are joined to each other and can be fixed, and the check valve unit is configured to be held inside the fixed receiving pipe and the fixed pipe. According to such a configuration, the fixed pipe is attached to one end of the check valve unit, the other end of the check valve unit is inserted into the receiving pipe, and the fixed pipe and the receiving pipe are joined to each other, The check valve can be provided in the middle of the pipe by holding the check valve unit inside the fixed pipe and the containing pipe and attaching the containing pipe to the pipe in this state. Moreover, if a storage pipe is removed from piping and a fixed pipe and a storage pipe are isolate | separated, it can take out without damaging a non-return valve unit from the inside.

また本発明が他の解決手段として採用したところは、逆止弁を内部に備えた筒状の逆止弁ユニットを、配管の途中において交換可能に取り付ける逆止弁の取付構造であって、前記逆止弁ユニットの一方端部に冠着する固定管と、配管に対して着脱可能であり、前記逆止弁ユニットの他方端部を収容する収容管とを備え、前記収容管と前記固定管は互いにネジ結合可能とし、さらに前記逆止弁ユニットはネジ結合された前記収容管と前記固定管の内側に固定される構成とした点にある。かかる構成によると、固定管を逆止弁ユニットの一方端部に冠着して、逆止弁ユニットの他方端部を収容管に挿入し、固定管と収容管を互いにネジ結合することにより、逆止弁ユニットを固定管と収容管の内部に固定し、その状態で収容管を配管に取り付けることにより、逆止弁を配管の途中に設けることができる。また、収容管を配管から取り外して固定管と収容管のネジ結合を解放すれば、その内側から逆止弁ユニットを破損することなく取り出すことができる。   Further, the present invention adopts as another solution means a check valve mounting structure for mounting a cylindrical check valve unit provided with a check valve inside the pipe in a replaceable manner. A fixed pipe that attaches to one end of the check valve unit; and a storage pipe that is detachable from the pipe and receives the other end of the check valve unit; and the storage pipe and the fixed pipe Is capable of being screw-coupled to each other, and the check valve unit is fixed to the inside of the housing tube and the fixed tube that are screw-coupled. According to such a configuration, by fixing the fixed pipe to one end of the check valve unit, inserting the other end of the check valve unit into the storage pipe, and screwing the fixed pipe and the storage pipe together, The check valve can be provided in the middle of the pipe by fixing the check valve unit inside the fixed pipe and the containing pipe and attaching the containing pipe to the pipe in this state. Further, if the housing pipe is removed from the pipe and the screw connection between the fixed pipe and the housing pipe is released, the check valve unit can be taken out from the inside without being damaged.

また、この場合には、固定管の逆止弁ユニットに冠着する側とは反対側の端面に、多角形の凹部又は突部を設けても良い。かかる構成においては、固定管の凹部又は突部に対して同様の多角形の突部又は凹部を有する工具を嵌合することにより、固定管と収容管をネジ結合する作業が行い易くなる。   In this case, a polygonal recess or protrusion may be provided on the end surface of the fixed pipe opposite to the side that is attached to the check valve unit. In such a configuration, by fitting a tool having a similar polygonal protrusion or recess to the recess or protrusion of the fixed tube, the work of screwing the fixed tube and the housing tube is facilitated.

また、固定管と収容管のいずれか一方にナットを環装すると共に、他方の外側面に雄ねじを設け、ナットと雄ねじがネジ結合することにより、固定管と収容管が接合状態で固定されるように構成しても良い。   In addition, a nut is mounted on one of the fixed tube and the storage tube, and a male screw is provided on the outer surface of the other, and the nut and the male screw are screwed together to fix the fixed tube and the storage tube in a joined state. You may comprise as follows.

また、ネジ結合とは異なる態様として、前記固定管と前記収容管のいずれか一方の周壁外面に突片を設け、他方の開口端には軸心方向に向かう開口壁を設けると共に、前記突片に対応して前記開口壁に凹部を設け、前記突片は前記凹部を介して前記開口壁の内側に挿入し、前記固定管と前記収容管を相対的に回動させることにより、前記突片が前記開口壁の内側に係合して前記固定管及び前記収容管を互いに接合させる構成としても良い。かかる構成の場合でも、突片と開口壁の係合による固定管と収容管の接合状態を解除すれば、その内側から逆止弁ユニットを破損することなく取り出すことができる。   Further, as a mode different from the screw coupling, a protruding piece is provided on the outer peripheral surface of one of the fixed pipe and the receiving pipe, an opening wall in the axial direction is provided at the other opening end, and the protruding piece The protrusion wall is provided with a recess corresponding to the protrusion, the protrusion is inserted into the opening wall through the recess, and the fixed tube and the receiving tube are relatively rotated, thereby the protrusion It is good also as a structure which engages the inner side of the said opening wall, and joins the said fixed pipe and the said storage pipe mutually. Even in such a configuration, the check valve unit can be taken out from the inner side without damaging it by releasing the joined state between the fixed pipe and the receiving pipe by the engagement between the projecting piece and the opening wall.

またこの場合には、収容管の内部に、固定管を押し出す方向に付勢する弾性手段を設け、該弾性手段が、前記突片と開口壁とが互いに係合した状態で固定管を付勢して前記固定管と前記収容管の相対的な回動を抑制する構成とすることが好ましい。かかる構成の場合には、収容管と固定管の相対的な回動が抑制され、意図しない収容管と固定管の分離を防止できる。   Also, in this case, an elastic means for urging the fixing tube in the direction of pushing out the fixing tube is provided inside the housing tube, and the elastic means urges the fixing tube in a state where the protruding piece and the opening wall are engaged with each other. And it is preferable to set it as the structure which suppresses relative rotation of the said fixed pipe and the said storage pipe. In the case of such a configuration, relative rotation between the storage tube and the fixed tube is suppressed, and unintended separation of the storage tube and the fixed tube can be prevented.

本発明の逆止弁取付構造によると、固定管を逆止弁ユニットの一方端部に冠着すると共に、収容管に対して逆止弁ユニットの他方端部を収容して、固定管と収容管を互いに接合させて固定することにより、逆止弁ユニットを収容管と固定管の内側に固定することができる。そして固定管と収容管を手操作で接合したり、又は解除することにより、収容管と固定管の内側に簡単に逆止弁ユニットを取り付けることができると共に、収容管と固定管の内側から簡単に逆止弁ユニットを取り出すことができる。また収容管は配管に対して着脱可能であることから、配管の途中に簡単な作業で逆止弁を取り付けることができると共に、メンテナンスや交換作業時にも簡単に逆止弁の取り出しを行える。   According to the check valve mounting structure of the present invention, the fixed pipe is attached to one end of the check valve unit, and the other end of the check valve unit is accommodated with respect to the accommodating pipe. The check valve unit can be fixed inside the receiving tube and the fixed tube by joining the tubes together and fixing them. Then, by manually joining or releasing the fixed tube and the storage tube, the check valve unit can be easily attached to the inside of the storage tube and the fixed tube, and easily from the inside of the storage tube and the fixed tube. The check valve unit can be removed. In addition, since the storage tube can be attached to and detached from the pipe, the check valve can be attached to the pipe by a simple operation, and the check valve can be easily taken out during maintenance and replacement work.

また固定管と収容管が互いにネジ結合する構成の場合には、固定管と収容管の固定と分離が極めて簡単であり、手作業で容易に逆止弁ユニットの取り付けや取り外しを行うことができる。また固定管と収容管のいずれか一方の周壁外面に突片を設け、他方の開口端には軸心方向に向かう開口壁を設けると共に、突片に対応して開口壁に凹部を設けた構成とし、凹部を介して突片を開口壁の内側に挿入し、固定管と収容管を相対的に回動させることにより、突片が開口壁の内側に係合して固定管及び収容管が互いに接合する構成とした場合にも、手作業で容易に逆止弁ユニットの取り付けや取り外しを行うことができる。   In addition, when the fixed tube and the storage tube are coupled to each other by screws, the fixed tube and the storage tube can be fixed and separated very easily, and the check valve unit can be easily attached and detached manually. . In addition, a projecting piece is provided on the outer peripheral surface of one of the fixed pipe and the housing pipe, an opening wall is provided in the axial direction at the other opening end, and a recess is provided in the opening wall corresponding to the projecting piece. The projecting piece is inserted into the inside of the opening wall through the recess, and the fixed tube and the receiving tube are rotated relative to each other, so that the projecting piece is engaged with the inside of the opening wall so that the fixing tube and the receiving tube are Even when it is configured to be joined to each other, the check valve unit can be easily attached and detached manually.

以下、図面に基づいて本発明の好ましい実施形態を詳述する。尚、以下においては、一例として、給水配管途中に設けられる止水栓に対して逆止弁を設ける構造、より詳しくは配管に対して止水栓を着脱可能とするために該止水栓に連結されるユニオン管（継手）の内部に逆止弁（逆止弁ユニット）を取り付けるようにした構造を例示する。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description, as an example, a structure in which a check valve is provided for a stop cock provided in the middle of a water supply pipe, more specifically, in order to make the stop cock detachable from the pipe, The structure which attached the check valve (check valve unit) inside the union pipe (joint) connected is illustrated.

（第一実施形態）
図１は本発明に係る逆止弁取付構造の第一の態様を示す図である。この態様においては、止水栓１００の一方側にユニオン管１が着脱可能に連結されており、該ユニオン管１の内部に、円筒状の逆止弁ユニット２が収容された状態で固定される。逆止弁ユニット２は内部に逆止弁３を備えており、例えば水流が止水栓１００の内部を図中右方向に流れる場合、逆止弁３が右方向に移動して逆止弁ユニット２の左端開口部を開放し、水流を下流側に導く。それに対して、水流が下流側から左方向（上流側）に流れる場合には、逆止弁３が左方向に移動して左端開口部を閉塞し、上流側への逆流を防止する。 (First embodiment)
FIG. 1 is a view showing a first embodiment of a check valve mounting structure according to the present invention. In this embodiment, the union pipe 1 is detachably connected to one side of the stop cock 100 and is fixed in a state in which the cylindrical check valve unit 2 is accommodated in the union pipe 1. . The check valve unit 2 includes a check valve 3 therein. For example, when water flows in the right direction in the figure through the stop cock 100, the check valve 3 moves to the right and the check valve unit The left end opening 2 is opened, and the water flow is guided downstream. On the other hand, when the water flow flows from the downstream side to the left direction (upstream side), the check valve 3 moves leftward to close the left end opening, thereby preventing the reverse flow upstream.

図２乃至図４はユニオン管１を示す図であり、図２はユニオン管１を分解した状態を示し、図３はユニオン管１を組み付ける際の中間段階を示している。また図４はユニオン管１の内部に逆止弁ユニット２を収容して組み付けた状態を示している。各図に示すように、ユニオン管１は、逆止弁ユニット２の一方側端部に冠着する固定管４と、逆止弁ユニット２の他方側端部を収容する収容管５とを備えて構成され、固定管４と収容管５は互いに接合して固定することが可能である。本実施形態は、固定管４と収容管５の固定をネジ結合によって行う構成である。   2 to 4 are views showing the union pipe 1, FIG. 2 shows a state in which the union pipe 1 is disassembled, and FIG. 3 shows an intermediate stage when the union pipe 1 is assembled. FIG. 4 shows a state where the check valve unit 2 is housed and assembled in the union pipe 1. As shown in the drawings, the union pipe 1 includes a fixed pipe 4 that is attached to one end of the check valve unit 2 and a housing pipe 5 that houses the other end of the check valve unit 2. The fixed tube 4 and the housing tube 5 can be joined and fixed to each other. In the present embodiment, the fixed tube 4 and the housing tube 5 are fixed by screw connection.

固定管４には、管内に突出する内壁４１が設けられ、この内壁４１よりも下流側が逆止弁ユニット２の外径に適合するように形成されている。また固定管４の外周面には収容管５とネジ結合する雄ねじ４２が形成されると共に、Ｏリング４３が設けられている。更に固定管４の外側面には収容管５の開口端５１と当接する壁部４４が設けられる。尚、壁部４４の頂部には溝が刻設されており、ネジ結合のための回動操作を比較的容易に行うことができるようになっている。   The fixed pipe 4 is provided with an inner wall 41 protruding into the pipe, and the downstream side of the inner wall 41 is formed so as to match the outer diameter of the check valve unit 2. A male thread 42 that is screw-coupled to the receiving tube 5 is formed on the outer peripheral surface of the fixed tube 4, and an O-ring 43 is provided. Furthermore, a wall portion 44 is provided on the outer surface of the fixed tube 4 so as to contact the open end 51 of the housing tube 5. In addition, a groove is formed on the top of the wall portion 44 so that a rotation operation for screw connection can be performed relatively easily.

収容管５は逆止弁ユニット２を収容する収容部６を有し、この収容部６の内側面には固定管４の雄ねじ４２と螺合する雌ねじ５２が形成されている。そして収容部６の奥端には逆止弁ユニット２の端縁部と当接する内壁５３が設けられている。また収容管５の外側面には、環状部材７が設けられると共に、この環状部材７と係合しつつ回動可能なナット８が設けられる。このナット８は、ユニオン管１を上流側の止水栓１００に連結するための連結部材である。また収容管５の下流側外側面にはユニオン管１を下流側の配管に連結するためのナット９が設けられる。   The housing tube 5 has a housing portion 6 that houses the check valve unit 2, and a female screw 52 that is screwed into the male screw 42 of the fixed tube 4 is formed on the inner surface of the housing portion 6. An inner wall 53 that contacts the end edge of the check valve unit 2 is provided at the back end of the housing portion 6. An annular member 7 is provided on the outer surface of the receiving tube 5, and a nut 8 that can rotate while engaging with the annular member 7 is provided. This nut 8 is a connecting member for connecting the union pipe 1 to the water stop cock 100 on the upstream side. Further, a nut 9 for connecting the union pipe 1 to a downstream pipe is provided on the downstream side outer surface of the housing pipe 5.

ユニオン管１に逆止弁ユニット２を装着する際には、例えば図３に示すように、逆止弁ユニット２の一方側端部を固定管４の内側に嵌挿して、逆止弁ユニット２の端部２１が固定管４の内壁４１に当接した状態とする。これにより、固定管４が逆止弁ユニット２に冠着された状態となる。逆止弁ユニット２の外側面にはＯリング２２が設けられており、固定管４が逆止弁ユニット２に冠着すると、Ｏリング２２を介して固定管４の内壁と逆止弁ユニット２の周縁が互いに密着する。そして固定管４を回動させつつ、固定管４から逆止弁ユニット２が露出する部分を収容管２の内側に挿入していくと、固定管４の雄ねじ４２と収容管５の雌ねじ５２が互いに螺合していき、最終的に逆止弁ユニット２の端縁部が収容管５の内壁５３に当接する状態となる。これにより、ユニオン管１は図４に示す状態となり、固定管４と収容管５は互いに接合した状態で固定され、収容管５の開口端５１は固定管４の壁部４４に当接すると共に、固定管４と収容管５はＯリング４３を介して互いに密着する。このとき、逆止弁ユニット２は固定管４及び収容管５の内側に収容された状態で固定されることになる。尚、逆止弁ユニット２を固定管４及び収容管５の内側に収容する手順は、上記と逆の手順を採用してもよく、例えば逆止弁ユニット２を先に収容管５の内側に収容し、逆止弁ユニット２の収容管５から露出した部分に対して固定管４を被せるようにして固定管４を螺進させてもよい。   When the check valve unit 2 is mounted on the union pipe 1, for example, as shown in FIG. 3, one end of the check valve unit 2 is inserted into the inside of the fixed pipe 4 to check the check valve unit 2. The end 21 is in contact with the inner wall 41 of the fixed tube 4. As a result, the fixed tube 4 is attached to the check valve unit 2. An O-ring 22 is provided on the outer surface of the check valve unit 2, and when the fixed pipe 4 is attached to the check valve unit 2, the inner wall of the fixed pipe 4 and the check valve unit 2 are interposed via the O-ring 22. The peripheries of the two are in close contact with each other. When the portion where the check valve unit 2 is exposed from the fixed tube 4 is inserted into the receiving tube 2 while rotating the fixed tube 4, the male screw 42 of the fixed tube 4 and the female screw 52 of the receiving tube 5 are connected. The end portions of the check valve unit 2 are finally brought into contact with the inner wall 53 of the receiving tube 5 by being screwed together. As a result, the union tube 1 is in the state shown in FIG. 4, the fixed tube 4 and the housing tube 5 are fixed in a state where they are joined together, and the open end 51 of the housing tube 5 abuts against the wall portion 44 of the fixed tube 4. The fixed tube 4 and the housing tube 5 are in close contact with each other through the O-ring 43. At this time, the check valve unit 2 is fixed in a state of being accommodated inside the stationary tube 4 and the housing tube 5. The procedure for housing the check valve unit 2 inside the fixed tube 4 and the housing tube 5 may be the reverse of the above procedure. For example, the check valve unit 2 is placed inside the housing tube 5 first. The fixed tube 4 may be screwed so that the fixed tube 4 is put on the portion exposed from the storage tube 5 of the check valve unit 2.

そして図５に示す如く、ユニオン管１の固定管４を止水栓１００の連結管１０１に挿入し、連結管１０１の外側面に設けられた螺刻部１０２に対してナット８を螺着することにより、ユニオン管１を止水栓１００に取り付ける。また、ユニオン管１の下流側のナット９を下流側配管に連結する。   Then, as shown in FIG. 5, the fixed pipe 4 of the union pipe 1 is inserted into the connecting pipe 101 of the water stop cock 100, and the nut 8 is screwed to the threaded portion 102 provided on the outer surface of the connecting pipe 101. As a result, the union pipe 1 is attached to the stop cock 100. Further, the nut 9 on the downstream side of the union pipe 1 is connected to the downstream pipe.

以上のようにして既設配管中に取り付けられる逆止弁ユニット２は、上記と逆の手順で作業を進めることにより、簡単に取り出すことができる。即ち、まずナット８，９を緩めた後、配管からユニオン管１を取り外す。このとき、固定管４はネジ結合によって収容管２に連結されているため、収容管５を止水栓１００の連結管１０１から引き抜けば、固定管４及び収容管５がその内部に逆止弁ユニット２を収容した状態のままで一体的に取り出すことができる。そして固定管４を指で摘んでネジ結合を緩める方向に回動操作することにより、固定管４と収容管５のネジ結合を解除して、固定管４を収容管５から引き離す。すると、逆止弁ユニット２が固定管４と一体的に収容管５から引き出される。そして固定管４と逆止弁ユニット２を分離すれば、逆止弁ユニット２を破損することなく取り出すことができる。そして逆止弁ユニット２を交換する場合には、固定管４を新たな逆止弁ユニット２に冠着して上述の組み立て手順を行えばよい。   The check valve unit 2 mounted in the existing pipe as described above can be easily taken out by proceeding with the procedure reverse to the above. That is, first, the nuts 8 and 9 are loosened, and then the union pipe 1 is removed from the pipe. At this time, since the fixed tube 4 is connected to the receiving tube 2 by screw connection, if the receiving tube 5 is pulled out from the connecting tube 101 of the water stop cock 100, the fixed tube 4 and the receiving tube 5 are non-returned inside thereof. The valve unit 2 can be integrally taken out while being accommodated. Then, the fixed tube 4 is picked with a finger and rotated in a direction to loosen the screw connection, thereby releasing the screw connection between the fixed tube 4 and the receiving tube 5 and pulling the fixed tube 4 away from the receiving tube 5. Then, the check valve unit 2 is pulled out from the storage tube 5 integrally with the fixed tube 4. If the fixed pipe 4 and the check valve unit 2 are separated, the check valve unit 2 can be taken out without being damaged. When the check valve unit 2 is replaced, the above-described assembly procedure may be performed by attaching the fixed pipe 4 to the new check valve unit 2.

以上のように本実施形態では、ユニオン管１に対して逆止弁ユニット２を取り付ける際、又はユニオン管１から逆止弁ユニット２を取り外す際に、何ら工具を必要とせず、全て簡単な手作業で取り付けや取り外しを行うことができる。また、逆止弁ユニット２を取り外す際には、逆止弁ユニット２を破損することなく取り外すことができるので、逆止弁ユニット２のメンテナンスを行った後、再びユニオン管１内に戻して使用することも可能である。   As described above, in this embodiment, when the check valve unit 2 is attached to the union pipe 1 or when the check valve unit 2 is removed from the union pipe 1, no tool is required, and all are simple hands. It can be installed and removed at work. Also, when removing the check valve unit 2, the check valve unit 2 can be removed without damaging it. Therefore, after the check valve unit 2 is maintained, it is returned to the union pipe 1 for use. It is also possible to do.

（第二実施形態）
図６乃至図８は本発明の第二実施形態であるユニオン管１ａを示す図である。尚、各図において上述した構成部材と同様の構成部材については同一符号を付している。図６（ａ）に示すように、ユニオン管１ａは上述の第一実施形態と同様に、逆止弁ユニット２の一方側端部に冠着する固定管４と、逆止弁ユニット２の他方側端部を収容する収容管５とを備えており、固定管４と収容管５は互いにネジ結合によって固定することが可能な構成である。このユニオン管１ａは、固定管４と収容管５の内側に逆止弁ユニット３を設け、固定管４と収容管５を互いにネジ結合して固定すると、固定管４の周壁は収容管５の内側に収容され、固定管４の逆止弁ユニット２に冠着する側とは反対側の端面４５が収容管５の開口端５１とほぼ同一面内に配置される（図８参照）。 (Second embodiment)
6 to 8 are views showing a union pipe 1a according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the structural member similar to the structural member mentioned above in each figure. As shown in FIG. 6 (a), the union pipe 1a includes a fixed pipe 4 that is attached to one end of the check valve unit 2 and the other of the check valve unit 2, as in the first embodiment. An accommodation tube 5 that accommodates the side end portion is provided, and the fixed tube 4 and the accommodation tube 5 can be fixed to each other by screw connection. The union pipe 1 a is provided with a check valve unit 3 inside the fixed pipe 4 and the receiving pipe 5, and when the fixed pipe 4 and the receiving pipe 5 are screwed together and fixed, the peripheral wall of the fixed pipe 4 is An end face 45 opposite to the side of the fixed pipe 4 that is attached to the check valve unit 2 is disposed in substantially the same plane as the open end 51 of the containing pipe 5 (see FIG. 8).

本実施形態では固定管４の端面４５に凹部４６が形成される。図６（ｂ）に示すようにこの凹部４６は周縁が六角形に形成されており、この六角形の凹部４６に工具９０が係合する構成である。図７に示すように、工具９０は円筒状に構成され、工具９０の端面には凹部４６に嵌入する六角形の突部９１が設けられている。そして固定管４を逆止弁ユニット２に冠着した状態で、固定管４の凹部４６に工具９０の突部９１を挿入し、工具９０を回動させつつ、逆止弁ユニット２の固定管４から露出する部分を収容管５の内側に挿入していくと、固定管４の雄ねじ４２と収容管５の雌ねじ５２が互いに螺合していき、最終的に逆止弁ユニット２の端縁部が収容管５の内壁５３に当接する状態となる。これにより、ユニオン管１ａは図８に示す状態となり、固定管４と収容管５は互いに接合した状態で固定され、固定管４の端面４５は収容管５の開口端５１とほぼ同一面内に配置される。このとき、逆止弁ユニット２は固定管４及び収容管５の内側に収容された状態で固定されることになる。   In the present embodiment, a recess 46 is formed in the end surface 45 of the fixed tube 4. As shown in FIG. 6B, the recess 46 has a hexagonal periphery, and the tool 90 is engaged with the hexagonal recess 46. As shown in FIG. 7, the tool 90 is formed in a cylindrical shape, and an end face of the tool 90 is provided with a hexagonal protrusion 91 that fits into the recess 46. Then, with the fixed pipe 4 being attached to the check valve unit 2, the protrusion 91 of the tool 90 is inserted into the recess 46 of the fixed pipe 4, and the tool 90 is rotated while the fixed pipe of the check valve unit 2 is rotated. When the portion exposed from 4 is inserted inside the receiving tube 5, the male screw 42 of the fixed tube 4 and the female screw 52 of the receiving tube 5 are screwed together, and finally the end edge of the check valve unit 2. The portion comes into contact with the inner wall 53 of the housing tube 5. As a result, the union tube 1a is in the state shown in FIG. 8, the fixed tube 4 and the receiving tube 5 are fixed in a state of being joined together, and the end surface 45 of the fixed tube 4 is substantially in the same plane as the open end 51 of the receiving tube 5. Be placed. At this time, the check valve unit 2 is fixed in a state of being accommodated inside the stationary tube 4 and the housing tube 5.

図８に示すように固定管４の端面４５が収容管５の開口端５１とほぼ同一面内に配置されると、手動操作で固定管４を回動することが難しくなる。そのため、ユニオン管１ａから逆止弁ユニット２を取り出す際にも、上記工具９０を使用し、工具９０の突部９１を固定管４の凹部４６に嵌合させて工具９０を回動操作することにより、固定管４が収容管５から螺退していき、最終的に固定管４と収容管５が分離される。そして固定管４と一体的に逆止弁ユニット２を取り出すことができ、その後、固定管４と逆止弁ユニット２を分離すれば、逆止弁ユニット２を破損することなく取り出すことができる。そして逆止弁ユニット２を交換する場合には、固定管４を新たな逆止弁ユニット２に冠着して上述の組み立て手順を行えばよい。   As shown in FIG. 8, when the end surface 45 of the fixed tube 4 is disposed in substantially the same plane as the open end 51 of the housing tube 5, it is difficult to manually rotate the fixed tube 4. Therefore, also when taking out the check valve unit 2 from the union pipe 1a, the tool 90 is used, and the tool 90 is rotated by fitting the protrusion 91 of the tool 90 into the recess 46 of the fixed pipe 4. As a result, the fixed tube 4 is screwed out of the receiving tube 5 and finally the fixed tube 4 and the receiving tube 5 are separated. Then, the check valve unit 2 can be taken out integrally with the fixed pipe 4, and then the check valve unit 2 can be taken out without being damaged if the fixed pipe 4 and the check valve unit 2 are separated. When the check valve unit 2 is replaced, the above-described assembly procedure may be performed by attaching the fixed pipe 4 to the new check valve unit 2.

上記においては固定管４の端面４５に凹部４６が形成され、この凹部４６に工具９０の突部９１が嵌合して固定管４を収容管５に対して回動させることが可能な構成例を示したが、例えば図９（ａ）及び（ｂ）に示すように、固定管４の端面４５に六角形に突出した突部４７を形成しても良い。この場合には、工具９０の端面に固定管４の突部４７と係合する六角形の凹部を形成し、固定管４の突部４７が工具の凹部に嵌入した状態で工具を回動操作することにより、逆止弁ユニット２の取り付け及び取り外しができるようになる。   In the above, the recessed part 46 is formed in the end surface 45 of the fixed pipe 4, The protrusion 91 of the tool 90 fits into this recessed part 46, and the fixed pipe 4 can be rotated with respect to the accommodating pipe 5. However, as shown in FIGS. 9A and 9B, for example, a protrusion 47 projecting in a hexagonal shape may be formed on the end face 45 of the fixed tube 4. In this case, a hexagonal recess that engages with the protrusion 47 of the fixed tube 4 is formed on the end face of the tool 90, and the tool is rotated while the protrusion 47 of the fixed tube 4 is fitted in the recess of the tool. By doing so, the check valve unit 2 can be attached and detached.

また本実施形態では固定管４と工具９０が互いに六角形の凹部と突部により係合する場合を例示したが、これに限定されるものではなく、三角形以上の多角形であれば良い。   Further, in the present embodiment, the case where the fixed tube 4 and the tool 90 are engaged with each other by the hexagonal concave portion and the protruding portion is illustrated, but the present invention is not limited to this, and may be a polygon more than a triangle.

以上のように本実施形態では、固定管４の端面４５に多角形の凹部４６又は突部４７を設けており、ユニオン管１ａに対して逆止弁ユニット２を取り付ける際、又はユニオン管１ａから逆止弁ユニット２を取り外す際に、工具９０の端面に設けた突部９１又は凹部を固定管４の端面に装着して回動することにより、簡単な手作業で取り付けや取り外しを行うことができる。特に逆止弁ユニット２を取り外す際には、逆止弁ユニット２を破損することなく取り外すことができるので、逆止弁ユニット２のメンテナンスを行った後、再びユニオン管１ａ内に戻して使用することも可能である。   As described above, in the present embodiment, the polygonal recess 46 or the protrusion 47 is provided on the end surface 45 of the fixed tube 4, and when the check valve unit 2 is attached to the union tube 1a, or from the union tube 1a. When the check valve unit 2 is removed, the protrusion 91 or the recess provided on the end face of the tool 90 is attached to the end face of the fixed tube 4 and rotated, so that the check valve unit 2 can be attached or removed by simple manual work. it can. In particular, when removing the check valve unit 2, the check valve unit 2 can be removed without being damaged. Therefore, after the check valve unit 2 is maintained, the check valve unit 2 is returned to the union pipe 1a for use. It is also possible.

（第三実施形態）
図１０は固定管４の外周部にＯリング４８を設けた態様のユニオン管１ｂを示す図である。尚、同図において上述した構成部材と同様の構成部材については同一符号を付している。図１０に示す如く、固定管４の外周部に設けたＯリング４８は、ユニオン管１ｂが止水栓１００の連結管１０１（図５参照）に連結されたとき、連結管１０１の内周壁と密着するように設けられる。尚、その他の形態は上述の実施形態と同様である。本実施形態のように固定管４の外周部に連結管１０１の内壁と密着してユニオン管１ｂの内部を密閉するＯリング４８を設けることにより、ユニオン管１ｂの内部のシール性が高度に維持される。 (Third embodiment)
FIG. 10 is a view showing the union pipe 1 b in a mode in which an O-ring 48 is provided on the outer peripheral portion of the fixed pipe 4. In addition, the same code | symbol is attached | subjected about the structural member similar to the structural member mentioned above in the figure. As shown in FIG. 10, the O-ring 48 provided on the outer peripheral portion of the fixed pipe 4 is connected to the inner peripheral wall of the connection pipe 101 when the union pipe 1 b is connected to the connection pipe 101 (see FIG. 5) of the water stop cock 100. Provided in close contact. Other forms are the same as those in the above-described embodiment. As in this embodiment, by providing an O-ring 48 that seals the inside of the union pipe 1b in close contact with the inner wall of the connecting pipe 101 on the outer periphery of the fixed pipe 4, the inside sealing performance of the union pipe 1b is highly maintained. Is done.

尚、本実施形態でも第二実施形態で説明したように、固定管４の端面に多角形の凹部又は突部を設け、その端面に工具を装着して回動操作することによりネジ結合を行ったり、又はそのネジ結合を解くようにしても良い。   In this embodiment as well, as described in the second embodiment, a polygonal recess or protrusion is provided on the end surface of the fixed tube 4, and a screw is attached by attaching a tool to the end surface and performing a rotation operation. Alternatively, the screw connection may be released.

（第四実施形態）
図１１は収容管５の外面に設けたナット６０を介して固定管４と収容管５をネジ結合する態様のユニオン管１ｃを示す図である。尚、同図（ａ）及び（ｂ）において上述した構成部材と同様の構成部材については同一符号を付している。ユニオン管１ｃは収容管５の収容部６の周壁外面にナット６０を備えており、収容管５の開口端５１にパッキン６２を設けた構成である。収容管５の開口端５１の外縁部はナット６０の後端部内径よりも若干大きく形成され、開口端５１からナット６０が抜けず、収容管５とナット６０は互いに係合する。 (Fourth embodiment)
FIG. 11 is a view showing the union pipe 1c in a mode in which the fixed pipe 4 and the accommodation pipe 5 are screw-coupled via a nut 60 provided on the outer surface of the accommodation pipe 5. In addition, the same code | symbol is attached | subjected about the structural member similar to the structural member mentioned in the figure (a) and (b). The union pipe 1 c includes a nut 60 on the outer peripheral surface of the housing portion 6 of the housing pipe 5, and a packing 62 is provided at the opening end 51 of the housing pipe 5. The outer edge portion of the opening end 51 of the receiving tube 5 is formed to be slightly larger than the inner diameter of the rear end portion of the nut 60, the nut 60 cannot be removed from the opening end 51, and the receiving tube 5 and the nut 60 are engaged with each other.

ユニオン管１ｃに逆止弁ユニット２を装着する際には、固定管４を逆止弁ユニット２の一方側端部に冠着する。そして固定管４とナット６０のいずれか一方を回動させつつ、固定管４から逆止弁ユニット２が露出する部分を収容管５の内側に挿入していくと、固定管４の雄ねじ４２とナット６０の雌ねじ６１が互いに螺合していき、最終的に逆止弁ユニット２の端縁部が収容管５の内壁５３に当接する状態となる。これにより、ユニオン管１ｃは図１１（ｂ）に示す状態となり、固定管４と収容管５は互いに接合した状態で固定されると共に、固定管４と収容管５はパッキン６２を介して互いに密着する。このとき、逆止弁ユニット２は固定管４及び収容管５の内側に収容された状態で固定される。   When the check valve unit 2 is attached to the union pipe 1 c, the fixed pipe 4 is attached to one end of the check valve unit 2. Then, while rotating one of the fixed tube 4 and the nut 60 and inserting the portion where the check valve unit 2 is exposed from the fixed tube 4 into the housing tube 5, the male screw 42 of the fixed tube 4 The female screw 61 of the nut 60 is screwed together, and finally the end edge portion of the check valve unit 2 comes into contact with the inner wall 53 of the receiving tube 5. As a result, the union tube 1c is in the state shown in FIG. 11B, and the fixed tube 4 and the receiving tube 5 are fixed in a state where they are joined together, and the fixed tube 4 and the receiving tube 5 are in close contact with each other via the packing 62. To do. At this time, the check valve unit 2 is fixed in a state where it is housed inside the stationary tube 4 and the housing tube 5.

逆にユニオン管１ｃから逆止弁ユニット２を取り出す際には、固定管４とナット６０を互いに反対方向に回動操作し、固定管４とナット６０のネジ結合を解除していくことにより、固定管４を収容管５から引き離す。すると、逆止弁ユニット２が固定管４と一体的に収容管５から引き出される。そして固定管４と逆止弁ユニット２を分離すれば、逆止弁ユニット２を破損することなく取り出すことができる。   Conversely, when the check valve unit 2 is taken out from the union pipe 1c, the fixed pipe 4 and the nut 60 are rotated in opposite directions, and the screw connection between the fixed pipe 4 and the nut 60 is released. The fixed tube 4 is pulled away from the housing tube 5. Then, the check valve unit 2 is pulled out from the storage tube 5 integrally with the fixed tube 4. If the fixed pipe 4 and the check valve unit 2 are separated, the check valve unit 2 can be taken out without being damaged.

以上のように本実施形態のユニオン管１ｃは、収容管５の外周面に設けたナット６０と固定管４との螺合により、固定管４と収容管５を互いに接合する構成である。そして固定管４とナット６０を簡単な手作業で螺合させることができると共に、そのネジ結合を解くこともできるので、逆止弁ユニット２の取り付けや取り外しは極めて簡単に行うことができる。そして逆止弁ユニット２のメンテナンスを行った後、再びユニオン管１ｃ内に戻して使用することも可能である。   As described above, the union tube 1c of the present embodiment is configured to join the fixed tube 4 and the storage tube 5 to each other by screwing the nut 60 and the fixed tube 4 provided on the outer peripheral surface of the storage tube 5. And since the fixed pipe 4 and the nut 60 can be screwed together by simple manual work and the screw connection can be released, the check valve unit 2 can be attached and detached very easily. After the check valve unit 2 is maintained, it can be returned to the union pipe 1c and used again.

尚、本実施形態では、固定管４と収容管５の当接部分にパッキン６２を配置して管内を密閉する場合を示したが、固定管４と収容管５の互いに接合する周壁の間にＯリングを配置して管内を密閉する構成としても良い。   In the present embodiment, the case where the packing 62 is disposed at the contact portion between the fixed tube 4 and the housing tube 5 to seal the inside of the tube is shown, but the fixed tube 4 and the housing tube 5 are sandwiched between the peripheral walls joined to each other. It is good also as a structure which arrange | positions an O-ring and seals the inside of a pipe | tube.

（第五実施形態）
上記第四実施形態では収容管５の外面にナット６０を設けた場合を例示したが、本実施形態では固定管４に収容管５と螺合するナット６０を設ける場合を例示する。図１２は本実施形態におけるユニオン管１ｄを示す図である。尚、同図（ａ）及び（ｂ）において上述した構成部材と同様の構成部材については同一符号を付している。ユニオン管１ｄは固定管４の周壁外面にナット６０を備えており、収容管５の開口端５１の外面に雄ねじ５４を設けると共に、開口端５１にパッキン６２を設けた構成である。固定管４は、逆止弁ユニット２を冠着する開口端の外側がナット６０の後端部内径よりも大きく形成され、この開口端からナット６０が抜けず、固定管４とナット６０は互いに係合する。 (Fifth embodiment)
In the fourth embodiment, the case where the nut 60 is provided on the outer surface of the housing tube 5 is illustrated, but in this embodiment, the case where the nut 60 that is screwed to the housing tube 5 is provided in the fixed tube 4 is illustrated. FIG. 12 is a diagram showing a union pipe 1d in the present embodiment. In addition, the same code | symbol is attached | subjected about the structural member similar to the structural member mentioned in the figure (a) and (b). The union pipe 1 d has a nut 60 on the outer peripheral surface of the fixed pipe 4, a male screw 54 provided on the outer face of the opening end 51 of the receiving pipe 5, and a packing 62 provided on the opening end 51. The fixed pipe 4 is formed such that the outside of the open end where the check valve unit 2 is crowned is larger than the inner diameter of the rear end portion of the nut 60, and the nut 60 cannot be removed from the open end. Engage.

ユニオン管１ｄに逆止弁ユニット２を装着する際には、固定管４を逆止弁ユニット２の一方側端部に冠着し、固定管４のナット６０を回動させつつ、固定管４から逆止弁ユニット２が露出する部分を収容管５の内側に挿入していくと、収容管５の外面に設けた雄ねじ５４とナット６０の雌ねじ６１が互いに螺合していき、最終的に逆止弁ユニット２の端縁部が収容管５の内壁５３に当接する状態となる。これにより、ユニオン管１ｄは図１２（ｂ）に示す状態となり、固定管４と収容管５は互いに接合した状態で固定されると共に、固定管４と収容管５はパッキン６２を介して互いに密着する。このとき、逆止弁ユニット２は固定管４及び収容管５の内側に収容された状態で固定される。   When the check valve unit 2 is mounted on the union pipe 1d, the fixed pipe 4 is attached to one end of the check valve unit 2 and the nut 60 of the fixed pipe 4 is rotated while the fixed pipe 4 is rotated. When the portion where the check valve unit 2 is exposed is inserted into the inside of the housing tube 5, the male screw 54 provided on the outer surface of the housing tube 5 and the female screw 61 of the nut 60 are screwed together, and finally. The end edge portion of the check valve unit 2 comes into contact with the inner wall 53 of the housing tube 5. As a result, the union tube 1d is in the state shown in FIG. 12B, and the fixed tube 4 and the receiving tube 5 are fixed in a state where they are joined to each other. To do. At this time, the check valve unit 2 is fixed in a state of being accommodated inside the stationary tube 4 and the housing tube 5.

逆にユニオン管１ｄから逆止弁ユニット２を取り出す際には、固定管４のナット６０を反対方向に回動操作し、固定管４のナット６０と収容管５のネジ結合を解除していくことにより、固定管４を収容管５から引き離す。すると、逆止弁ユニット２が固定管４と一体的に収容管５から引き出される。そして固定管４と逆止弁ユニット２を分離すれば、逆止弁ユニット２を破損することなく取り出すことができる。   Conversely, when the check valve unit 2 is taken out from the union pipe 1d, the nut 60 of the fixed pipe 4 is rotated in the opposite direction, and the screw connection between the nut 60 of the fixed pipe 4 and the receiving pipe 5 is released. As a result, the fixed tube 4 is pulled away from the housing tube 5. Then, the check valve unit 2 is pulled out from the storage tube 5 integrally with the fixed tube 4. If the fixed pipe 4 and the check valve unit 2 are separated, the check valve unit 2 can be taken out without being damaged.

以上のように本実施形態のユニオン管１ｄは、固定管４の外周面に設けたナット６０と、収容管５の外周面に設けた雄ねじ５４との螺合により、固定管４と収容管５を互いに接合する構成である。そして固定管４のナット６０を簡単な手作業で収容管５に螺合させることができると共に、そのネジ結合を解くことができるので、逆止弁ユニット２の取り付けや取り外しは極めて簡単に行うことができる。そして逆止弁ユニット２のメンテナンスを行った後、再びユニオン管１ｃ内に戻して使用することも可能である。   As described above, the union pipe 1d of the present embodiment has the fixed pipe 4 and the receiving pipe 5 that are screwed together with the nut 60 provided on the outer peripheral face of the fixed pipe 4 and the male screw 54 provided on the outer peripheral face of the receiving pipe 5. Are joined to each other. The nut 60 of the fixed tube 4 can be screwed into the receiving tube 5 by a simple manual operation, and the screw connection can be released, so that the check valve unit 2 can be attached and removed very easily. Can do. After the check valve unit 2 is maintained, it can be returned to the union pipe 1c and used again.

（第六実施形態）
上述の第一から第五実施形態は、固定管４と収容管５をネジ結合により互いに接合状態とする形態を例示したが、本実施形態では、固定管４と収容管５のいずれか一方の周壁外面に突片を設け、他方の開口端にはその突片と係合する開口壁を設けてそれらが互いに係合することにより、固定管４と収容管５とを互いに接合するようにしたユニオン管１ｅの構成を例示する。図１３は本実施形態におけるユニオン管１ｅの分解状態を示す図である。ユニオン管１ｅは、上述の各実施形態と同様に、逆止弁ユニット２の一方側端部に冠着する固定管４と、逆止弁ユニット２の他方側端部を収容する収容管５とを備えており、固定管４と収容管５は互いに突片４９と開口壁５６が係止することによって固定することが可能な構成である。 (Sixth embodiment)
In the first to fifth embodiments described above, the fixed tube 4 and the storage tube 5 are joined to each other by screw connection. However, in this embodiment, either the fixed tube 4 or the storage tube 5 is used. A projecting piece is provided on the outer surface of the peripheral wall, and an opening wall that engages with the projecting piece is provided at the other opening end so that they are engaged with each other so that the fixed tube 4 and the housing tube 5 are joined to each other. The structure of the union pipe | tube 1e is illustrated. FIG. 13 is a diagram showing an exploded state of the union pipe 1e in the present embodiment. The union pipe 1e includes a fixed pipe 4 that is attached to one end of the check valve unit 2 and a receiving pipe 5 that houses the other end of the check valve unit 2, as in the above-described embodiments. The fixing tube 4 and the housing tube 5 are configured to be fixed by the projecting piece 49 and the opening wall 56 being engaged with each other.

図１４（ａ）は固定管４を示す斜視図であり、（ｂ）は収容管５の開口端５１付近を示す斜視図である。図例では逆止弁ユニット２に冠着する固定管４の周壁外面に突片４９が設けられる。また収容管５の開口端５１には縁部から軸心に向かう開口壁５６が設けられており、その開口壁５６には、固定管４の突片４９に対応する凹部５５が設けられる。そして凹部５５から突片４９を収容管５の内側に導入する構成である。そのため、固定管４の突片４９を収容管５の凹部５５を介して収容管５内部に挿入し、固定管４と収容管５を相対的に回動させることにより、突片４９が開口壁５６の内側に係合して固定管４の抜けが防止され、固定管４と収容管５が互いに接合する。   FIG. 14A is a perspective view showing the fixed tube 4, and FIG. 14B is a perspective view showing the vicinity of the opening end 51 of the housing tube 5. In the illustrated example, a protruding piece 49 is provided on the outer surface of the peripheral wall of the fixed pipe 4 that is attached to the check valve unit 2. An opening wall 56 is provided at the opening end 51 of the receiving tube 5 from the edge toward the axis, and a recess 55 corresponding to the protruding piece 49 of the fixed tube 4 is provided on the opening wall 56. And it is the structure which introduce | transduces the protruding piece 49 into the inner side of the accommodating tube 5 from the recessed part 55. FIG. Therefore, the projecting piece 49 of the fixed tube 4 is inserted into the housing tube 5 through the recess 55 of the housing tube 5 and the fixed tube 4 and the housing tube 5 are rotated relatively, whereby the projecting piece 49 is opened. 56 is engaged to prevent the fixed tube 4 from coming off, and the fixed tube 4 and the receiving tube 5 are joined to each other.

収容管５の内部には固定管４の端縁部に当接して固定管４を押し出す方向に付勢する弾性手段としてスプリング５８が設けられており、固定管４の突片４９を上述のように収容管５の内側に挿入して回動せしめた際、スプリング５８が固定管４を付勢して突片４９を開口壁５６に向けて押圧するので、固定管４と収容管５の相対的な回動が抑制され、収容管５から固定管４が抜けることを防止する。尚、弾性手段はスプリングの他、板バネ等を採用しても良い。また図１３の例ではスプリング５８が固定管４の端縁部に当接する場合を示しているが、これに限られるものではなく、例えば逆止弁ユニット２の端部に当接して固定管４を押し出す方向に付勢するようにしても良い。   A spring 58 is provided in the housing tube 5 as an elastic means for abutting the edge of the fixed tube 4 and biasing the fixed tube 4 in the pushing direction, and the protruding piece 49 of the fixed tube 4 is provided as described above. Since the spring 58 urges the fixed tube 4 and presses the projecting piece 49 toward the opening wall 56 when it is inserted inside the storage tube 5 and rotated, the relative relationship between the fixed tube 4 and the storage tube 5 Rotation is suppressed, and the fixed tube 4 is prevented from coming off from the housing tube 5. The elastic means may be a leaf spring or the like in addition to the spring. In the example of FIG. 13, the spring 58 is in contact with the end edge of the fixed tube 4. However, the present invention is not limited to this. For example, the spring 58 is in contact with the end of the check valve unit 2. You may make it urge in the direction which pushes out.

また収容管５の開口端５１に設けられた開口壁５６の内面側は、図１４（ｂ）に示す如く、軸周りの一部に薄肉の段差面５７が形成されている。そのため固定管４の突片４９がスプリング５８に付勢されてこの段差面５７に押し付けられる場合には、万一、固定管４が回動したとしても突片４９が段差面５７を超えることはないので、収容管５から固定管４が抜けることを極めて良好に防止できるようになる。   Further, on the inner surface side of the opening wall 56 provided at the opening end 51 of the housing tube 5, as shown in FIG. 14B, a thin step surface 57 is formed in a part around the axis. Therefore, when the protruding piece 49 of the fixed tube 4 is urged by the spring 58 and pressed against the stepped surface 57, the protruding piece 49 does not exceed the stepped surface 57 even if the fixed tube 4 rotates. Therefore, the fixed tube 4 can be prevented from coming off from the housing tube 5 very well.

このユニオン管１ｅに逆止弁ユニット２を装着する際には、固定管４に逆止弁ユニット２の一方側端部を冠着し、固定管４の突片４９と収容管５の凹部５５が適合するようにして固定管４を収容管５に挿入し、固定管４を収容管５に対して若干回動させる。すると、スプリング５８が固定管４を押し戻し、突片４９が開口壁５６の段差面５７に係合し、図１５に示す状態となって固定管４と収容管５が互いに接合した状態で固定される。そして逆止弁ユニット２は固定管４と収容管５の内部に保持される。   When the check valve unit 2 is mounted on the union pipe 1e, one end of the check valve unit 2 is attached to the fixed pipe 4, and the protruding piece 49 of the fixed pipe 4 and the recess 55 of the housing pipe 5 are attached. Then, the fixed tube 4 is inserted into the receiving tube 5 so as to fit, and the fixed tube 4 is slightly rotated with respect to the receiving tube 5. Then, the spring 58 pushes back the fixed tube 4, the projecting piece 49 engages with the stepped surface 57 of the opening wall 56, and the state shown in FIG. 15 is obtained, and the fixed tube 4 and the receiving tube 5 are fixed to each other. The The check valve unit 2 is held inside the fixed tube 4 and the housing tube 5.

逆に、逆止弁ユニット２を取り出す際には、スプリング５８の付勢力に抗して固定管４を収容管５の内側に若干押し込み、突片４９と凹部５５の位置が一致するように固定管４を回動操作した後、固定管４を収容管５から引き抜けば固定管４と共に逆止弁ユニット２を取り出すことができる。尚、ユニオン管１ｅの止水栓１００への取り付け及び取り外しは上述の実施形態と同様である。   On the contrary, when the check valve unit 2 is taken out, the fixed tube 4 is slightly pushed inside the housing tube 5 against the urging force of the spring 58 and fixed so that the positions of the projecting piece 49 and the recessed portion 55 coincide. After rotating the tube 4, the check valve unit 2 can be taken out together with the fixed tube 4 by pulling out the fixed tube 4 from the housing tube 5. Note that the union pipe 1e is attached to and removed from the water stop cock 100 in the same manner as in the above-described embodiment.

以上のように本実施形態は、ユニオン管１ｅに対して逆止弁ユニット２を取り付ける際、又はユニオン管１ｅから逆止弁ユニット２を取り外す際に、何ら工具を必要とせず、全て簡単な手作業で取り付けや取り外しを行うことができる。また、逆止弁ユニット２を取り外す際には、逆止弁ユニット２を破損することなく取り外すことができるので、逆止弁ユニット２のメンテナンスを行った後、再びユニオン管１ｅ内に戻して使用することも可能である。尚、本実施形態では固定管４に突片４９を設け、収容管５に凹部５５を有する開口壁５６を設けた場合を例示したが、この関係は逆であっても構わない。即ち、突片を収容管５側に設け、固定管４側にその突片と係合する壁を設けても良い。   As described above, the present embodiment does not require any tools when attaching the check valve unit 2 to the union pipe 1e or when removing the check valve unit 2 from the union pipe 1e. It can be installed and removed at work. In addition, when removing the check valve unit 2, the check valve unit 2 can be removed without damaging it. After maintenance of the check valve unit 2, it is returned to the union pipe 1e and used again. It is also possible to do. In this embodiment, the case where the protruding piece 49 is provided on the fixed tube 4 and the opening wall 56 having the concave portion 55 is provided on the receiving tube 5 is illustrated, but this relationship may be reversed. That is, the protruding piece may be provided on the housing tube 5 side, and the wall that engages with the protruding piece may be provided on the fixed tube 4 side.

（変形例）
以上、本発明に関するいくつかの実施形態について説明したが、本発明は上述のものに限定されるものではない。 (Modification)
As mentioned above, although several embodiment regarding this invention was described, this invention is not limited to the above-mentioned thing.

例えば、上記説明では、給水配管途中に設けられる止水栓のユニオン管に対して逆止弁ユニットを設ける構造について述べたが、それに限定されるものではない。即ち、逆止弁ユニットを収容する収容管が配管に対して着脱可能なものであれば、それに対して上述の構成を適用することができる。例えば、単式逆止弁と呼ばれるものは、配管継手の一種であって、継手本体の管状体内部に逆止弁ユニットを収容し、止水栓や伸縮ユニオンとは関係なく、単独で配管途中に取り付けられるが、このような配管継手における逆止弁の取付構造としても、上述した構成を適用することができる。この場合であっても、配管の途中に対して簡単な作業で逆止弁を取り付けることができると共に、メンテナンスや交換作業時には専用工具を用いることなく簡単に逆止弁の取り出しを行えるようになる。また、継手に対して上述の逆止弁取付構造を設けることにより、止水栓の設置位置に関係なく、逆止弁を取り付けることができるという利点がある。   For example, in the above description, the structure in which the check valve unit is provided for the union pipe of the water stop cock provided in the middle of the water supply pipe is described, but the present invention is not limited thereto. That is, if the accommodation pipe which accommodates the check valve unit is detachable from the pipe, the above-described configuration can be applied thereto. For example, what is called a single check valve is a type of piping joint that contains a check valve unit inside the tubular body of the joint body, and is independently in the middle of the piping, regardless of the stop cock or the expansion union. Although it attaches, the structure mentioned above is applicable also as an attachment structure of a check valve in such a pipe joint. Even in this case, the check valve can be attached to the middle of the pipe with a simple operation, and the check valve can be easily taken out without using a dedicated tool during maintenance or replacement work. . Moreover, there exists an advantage that a check valve can be attached irrespective of the installation position of a water stopcock by providing the above-mentioned check valve attachment structure with respect to a coupling.

逆止弁取付構造の一態様を示す図である。It is a figure which shows the one aspect | mode of a non-return valve attachment structure. 第一実施形態のユニオン管を分解した状態を示す図である。It is a figure which shows the state which decomposed | disassembled the union pipe | tube of 1st embodiment. 第一実施形態のユニオン管を組み付ける際の中間段階を示す図である。It is a figure which shows the intermediate | middle stage at the time of assembling the union pipe | tube of 1st embodiment. 第一実施形態のユニオン管を組み付けた状態を示す図である。It is a figure showing the state where the union pipe of a first embodiment was assembled. ユニオン管を止水栓に接続する態様を示す図である。It is a figure which shows the aspect which connects a union pipe | tube to a water stop cock. 固定管の端面に多角形の凹部を設けた第二実施形態のユニオン管を示す図であり、（ａ）はユニオン管を分解した状態を示し、（ｂ）は固定管の逆止弁ユニットに冠着する側とは反対側の端面を示す図である。It is a figure which shows the union pipe of 2nd embodiment which provided the polygonal recessed part in the end surface of a fixed pipe, (a) shows the state which decomposed | disassembled the union pipe, (b) is a check valve unit of a fixed pipe. It is a figure which shows the end surface on the opposite side to the side to wear. 第二実施形態のユニオン管を組み付ける際の中間段階を示す図である。It is a figure which shows the intermediate | middle stage at the time of assembling the union pipe | tube of 2nd embodiment. 第二実施形態のユニオン管を組み付けた状態を示す図である。It is a figure which shows the state which assembled | attached the union pipe | tube of 2nd embodiment. 固定管の端面に多角形の突部を設けた第二実施形態のユニオン管を示す図であり、（ａ）はユニオン管を分解した状態を示し、（ｂ）は組み付けた状態を示す図である。It is a figure which shows the union pipe of 2nd embodiment which provided the polygonal protrusion in the end surface of a fixed pipe, (a) shows the state which decomposed | disassembled the union pipe, (b) is a figure which shows the assembled state is there. 第三実施形態のユニオン管を組み付けた状態を示す図である。It is a figure which shows the state which assembled | attached the union pipe of 3rd embodiment. 収容管の外面に設けたナットを介して固定管と収容管をネジ結合する第四実施形態のユニオン管を示す図であり、（ａ）はユニオン管を分解した状態を示し、（ｂ）は組み付けた状態を示す図である。It is a figure which shows the union pipe of 4th embodiment which screw-connects a fixed pipe and an accommodation pipe via the nut provided in the outer surface of the accommodation pipe, (a) shows the state which decomposed | disassembled the union pipe, (b) It is a figure which shows the assembled state. 固定管に収容管と螺合するナットを設けた第五実施形態のユニオン管を示す図であり、（ａ）はユニオン管を分解した状態を示し、（ｂ）は組み付けた状態を示す図である。It is a figure which shows the union pipe of 5th embodiment which provided the nut screwed together with a storage pipe in a fixed pipe, (a) shows the state which disassembled the union pipe, (b) is a figure which shows the assembled state. is there. 第六実施形態のユニオン管を分解した状態を示す図である。It is a figure which shows the state which decomposed | disassembled the union pipe | tube of 6th embodiment. 第六実施形態におけるユニオン管の固定管と収容管の端部の構造を示す図である。It is a figure which shows the structure of the edge part of the fixed pipe | tube and accommodation pipe | tube of a union pipe in 6th embodiment. 第六実施形態のユニオン管を組み付けた状態を示す図である。It is a figure which shows the state which assembled | attached the union pipe of 6th embodiment.

符号の説明Explanation of symbols

１，１ａ，１ｂ，１ｃ，１ｄ，１ｅ ユニオン管（ユニオン継手）
２ 逆止弁ユニット
３ 逆止弁
４ 固定管
５ 収容管
４２ 雄ねじ
４５ 端面
４６ 凹部（多角形の凹部）
４７ 突部（多角形の突部）
４９ 突片
５１ 開口端
５２ 雌ねじ
５５ 凹部
５６ 開口壁
５７ 段差面
５８ スプリング（弾性手段）
６０ ナット 1, 1a, 1b, 1c, 1d, 1e Union pipe (Union joint)
2 Check Valve Unit 3 Check Valve 4 Fixed Pipe 5 Housing Pipe 42 Male Screw 45 End Face 46 Concave (Polygonal Concave)
47 Projection (Polygonal Projection)
49 Projection piece 51 Open end 52 Female thread 55 Recessed part 56 Opening wall 57 Step surface 58 Spring (elastic means)
60 nuts

Claims (6)

逆止弁を内部に備えた筒状の逆止弁ユニットを、配管の途中において交換可能に取り付ける逆止弁の取付構造であって、
前記逆止弁ユニットの一方端部に冠着する固定管と、
配管に対して着脱可能であり、前記逆止弁ユニットの他方端部を収容する収容管とを備え、
前記収容管と前記固定管は互いに接合して固定可能とし、さらに前記逆止弁ユニットは互いに固定された前記収容管と前記固定管の内側に保持されることを特徴とする逆止弁取付構造。 A check valve mounting structure in which a cylindrical check valve unit provided with a check valve is attached in the middle of piping so as to be replaceable.
A fixed pipe that is attached to one end of the check valve unit;
A pipe that is detachable from the pipe, and that houses the other end of the check valve unit;
The check valve mounting structure is characterized in that the storage pipe and the fixed pipe can be joined and fixed to each other, and the check valve unit is held inside the fixed storage pipe and the fixed pipe. . 逆止弁を内部に備えた筒状の逆止弁ユニットを、配管の途中において交換可能に取り付ける逆止弁の取付構造であって、
前記逆止弁ユニットの一方端部に冠着する固定管と、
配管に対して着脱可能であり、前記逆止弁ユニットの他方端部を収容する収容管とを備え、
前記収容管と前記固定管は互いにネジ結合可能とし、さらに前記逆止弁ユニットはネジ結合された前記収容管と前記固定管の内側に固定されることを特徴とする逆止弁取付構造。 A check valve mounting structure in which a cylindrical check valve unit provided with a check valve is attached in the middle of piping so as to be replaceable.
A fixed pipe that is attached to one end of the check valve unit;
A pipe that is detachable from the pipe, and that houses the other end of the check valve unit;
The check valve mounting structure is characterized in that the storage pipe and the fixed pipe can be screwed together, and the check valve unit is fixed inside the screwed pipe and the fixed pipe. 前記固定管の前記逆止弁ユニットに冠着する側とは反対側の端面に、多角形の凹部又は突部を設けてなる請求項２記載の逆止弁取付構造。   The check valve mounting structure according to claim 2, wherein a polygonal recess or protrusion is provided on an end surface of the fixed pipe opposite to a side that is attached to the check valve unit. 前記固定管と前記収容管のいずれか一方にナットを環装すると共に、他方の外側面に雄ねじを設け、ナットと雄ねじがネジ結合する構成とした請求項２又は３記載の逆止弁取付構造。   The check valve mounting structure according to claim 2 or 3, wherein a nut is mounted on one of the fixed tube and the receiving tube, a male screw is provided on the outer surface of the other, and the nut and the male screw are screw-coupled. . 前記固定管と前記収容管のいずれか一方の周壁外面に突片を設け、他方の開口端には軸心方向に向かう開口壁を設けると共に、前記突片に対応して前記開口壁に凹部を設け、前記突片は前記凹部を介して前記開口壁の内側に挿入し、前記固定管と前記収容管を相対的に回動させることにより、前記突片が前記開口壁の内側に係合して前記固定管及び前記収容管を互いに接合させる請求項１記載の逆止弁取付構造。   A protruding piece is provided on the outer peripheral surface of one of the fixed pipe and the receiving pipe, and an opening wall in the axial direction is provided at the other opening end, and a recess is formed in the opening wall corresponding to the protruding piece. The protruding piece is inserted into the inside of the opening wall via the recess, and the protruding piece is engaged with the inside of the opening wall by relatively rotating the fixed pipe and the receiving pipe. The check valve mounting structure according to claim 1, wherein the fixed pipe and the receiving pipe are joined to each other. 前記収容管の内部には前記固定管を押し出す方向に付勢する弾性手段が設けられ、該弾性手段は前記突片と前記開口壁とが互いに係合した状態で前記固定管を付勢して前記固定管と前記収容管の相対的な回動を抑制する請求項５記載の逆止弁取付構造。 Elastic means for urging the fixed tube in the direction of pushing out the fixed tube is provided inside the storage tube, and the elastic device urges the fixed tube with the protruding piece and the opening wall engaged with each other. The check valve mounting structure according to claim 5, wherein relative rotation of the fixed tube and the storage tube is suppressed.
JP2005372561A 2005-12-26 2005-12-26 Check valve mounting structure Pending JP2007170630A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010144788A (en) * 2008-12-17 2010-07-01 Kitz Corp Check valve cartridge
JP2012241855A (en) * 2011-05-23 2012-12-10 Ebara Corp Check valve
JP2014084992A (en) * 2012-10-26 2014-05-12 Tabuchi Corp Check valve unit attachment structure
US10724394B2 (en) 2017-05-23 2020-07-28 Doosan Heavy Industries Construction Co., Ltd. Steam turbine and method of assembling and disassembling the same
JP2021050778A (en) * 2019-09-25 2021-04-01 株式会社タブチ Mounting structure of check valve unit
KR20230147822A (en) * 2022-04-15 2023-10-24 우성밸브 주식회사 Cartridge Type Check Valve

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010144788A (en) * 2008-12-17 2010-07-01 Kitz Corp Check valve cartridge
JP2012241855A (en) * 2011-05-23 2012-12-10 Ebara Corp Check valve
JP2014084992A (en) * 2012-10-26 2014-05-12 Tabuchi Corp Check valve unit attachment structure
US10724394B2 (en) 2017-05-23 2020-07-28 Doosan Heavy Industries Construction Co., Ltd. Steam turbine and method of assembling and disassembling the same
JP2021050778A (en) * 2019-09-25 2021-04-01 株式会社タブチ Mounting structure of check valve unit
JP7093565B2 (en) 2019-09-25 2022-06-30 株式会社タブチ Check valve unit mounting structure
KR20230147822A (en) * 2022-04-15 2023-10-24 우성밸브 주식회사 Cartridge Type Check Valve
KR102675402B1 (en) 2022-04-15 2024-06-14 우성밸브 주식회사 Cartridge Type Check Valve

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