JP5353001B2

JP5353001B2 - Water tap

Info

Publication number: JP5353001B2
Application number: JP2007337438A
Authority: JP
Inventors: 学利川幡; 敏光小楠
Original assignee: Toto Ltd
Current assignee: Toto Ltd
Priority date: 2007-12-27
Filing date: 2007-12-27
Publication date: 2013-11-27
Anticipated expiration: 2027-12-27
Also published as: JP2009155978A

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drain plug which can prevent a user from stopping the operation of an operation axis in progress at the time of switching operation from a drain state to a normal state since the movement distance of the operation axis in the axial direction at the time of switching operation between the normal state and the drain state is relatively small, and an operation force does not fluctuate. <P>SOLUTION: The drain plug 10 is provided with the operation axis 20, a drain clearance S, two seal rings 22a, 22b, and a peripheral channel 19b. The operation axis 20 is inserted to the interior of a drain hole 19f connecting between a water-connection passage 17a and the outside so that it can move in the axis X direction, and the drain clearance S is provided between the inner peripheral surface 19a of the drain hole 19f and the outer peripheral surface 20e of the operation axis 20. The two seal rings 22a, 22b are provided and engaged with the outer peripheral surface 20e in order to seal the drain clearance S, and the peripheral channel 19b is provided on the inner peripheral surface 19a. By moving the operation axis 20 in the axis X direction, switching can take place between a normal state and a drain state. In the normal state, the peripheral channel 19b is positioned between the seal rings 22a, 22b, and in the drain state, the seal ring 22b is placed opposed to the peripheral channel 19b and comes off the inner peripheral surface 19a of the drain hole 19f. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、水栓が凍結によって破損するのを防止するために設けられる水抜操作用の水抜栓に関する。 The present invention relates to a drain plug for drain operation provided to prevent the faucet from being damaged by freezing.

寒冷地などに設置された水栓が凍結するおそれのある場合、当該水栓に設けられた水抜栓を開いて水を抜くことにより、破損を防ぐという対策が講じられている。このような水抜栓については、従来、様々な機構が開発、実施されているが、本願発明に関連するものとして、操作軸を緩めることにより、水栓本体に押圧されているシール用の平らなパッキンを水栓本体から離反させて水を抜くもの、あるいは水抜栓の操作軸に装着されたシール用のＯリングを水栓本体から外すことによって水を抜くものなどがある（例えば、特許文献１参照。）。 When there is a possibility that a faucet installed in a cold district may freeze, measures are taken to prevent breakage by opening the water faucet provided in the faucet and draining water. For such a drain plug, various mechanisms have been developed and implemented in the past. However, as related to the present invention, a flat seal is pressed against the faucet body by loosening the operation shaft. There is a type in which the packing is separated from the faucet body to drain water, or a type in which water is drained by removing an O-ring for sealing attached to the operation shaft of the faucet (for example, Patent Document 1). reference.).

特開２００４−２７８２４３号公報JP 2004-278243 A

特許文献１記載の平らなパッキンは、使用者の締め付け力によってシール性能が左右されるため、締め付け力が弱いと水が漏れることがあり、逆に、締め付け力が強過ぎると水抜きの際に固くて動かなくなるおそれがある。 In the flat packing described in Patent Document 1, the sealing performance is affected by the tightening force of the user. Therefore, if the tightening force is weak, water may leak, and conversely, if the tightening force is too strong, There is a risk that it will be too hard to move.

一方、Ｏリングを使用する方式の場合、操作力は一定であり、シール性能も安定しているが、Ｏリングによるシール部を毎回抜き差しするので、Ｏリングの噛み込みが生じて、水が漏れる可能性がある。この場合、Ｏリングを２重にすれば水漏れに対する信頼性を向上させることができるが、その抜き差しするための水抜栓軸部の移動距離は長くなる。また、Ｏリングを順番に外していくときに、水抜栓の操作力は段階的に変化するため、操作性が低下する。さらに、片方のＯリングによってシールされれば水漏れは生じないので、使用者が途中で水抜栓の締め付けを止めてしまうことも予測される。 On the other hand, in the case of a method using an O-ring, the operating force is constant and the sealing performance is stable, but the O-ring seal portion is inserted and removed each time, so the O-ring bites and water leaks. there is a possibility. In this case, if the O-ring is doubled, it is possible to improve the reliability against water leakage, but the movement distance of the water draining shaft portion for inserting / removing the O-ring becomes long. Further, when removing the O-ring in order, the operation force of the water drainer changes stepwise, so that the operability is lowered. Further, since water leakage does not occur if sealed by one O-ring, it is also predicted that the user stops tightening the water drain plug on the way.

本発明が解決しようとする課題は、通常状態と水抜状態との切替操作時の操作軸の軸心方向の移動距離が比較的小さく、操作力が変動しないので、水抜状態から通常状態への切替操作時に使用者が操作軸の操作を途中で止めるおそれもない、水抜栓を提供することにある。 The problem to be solved by the present invention is that the movement distance in the axial direction of the operation shaft during the switching operation between the normal state and the drainage state is relatively small and the operation force does not fluctuate. An object of the present invention is to provide a water drain plug that does not cause the user to stop the operation of the operation shaft during operation.

本発明の水抜栓は、通水経路と外部とを連通する水抜孔内にその軸心方向に沿って移動可能に挿通された操作軸と、前記水抜孔の内周面と前記操作軸の外周面との間に前記軸心方向に沿って設けられた水抜空隙と、前記水抜空隙をシールするため前記水抜孔の内周面または前記操作軸の外周面の一方に互いに前記軸心方向に離れた状態で嵌装された二つのシールリングと、前記シールリングが嵌装されていない方の前記水抜孔の内周面または前記操作軸の外周面に設けられた前記シールリング間距離より狭幅の周溝と、を備え、
前記操作軸を前記軸心方向に移動させることにより、
前記シールリング間に前記周溝が位置する通常状態と、
一方の前記シールリングが前記周溝と対向するとともに、他方の前記シールリングが前記水抜孔の内周面または前記操作軸の外周面から外れる水抜状態と、に切替可能であることを特徴とする。
The drain plug of the present invention includes an operation shaft that is inserted in a water drain hole communicating with a water passage and the outside along the axial direction, an inner peripheral surface of the water drain hole, and an outer periphery of the operation shaft. A drain gap provided along the axial direction between the surface and one of the inner peripheral surface of the drain hole and the outer peripheral surface of the operation shaft to seal the drain gap. Narrower than the distance between the seal rings provided on the inner peripheral surface of the drain hole or the outer peripheral surface of the operation shaft on which the seal ring is not mounted, And a circumferential groove,
By moving the operation shaft in the axial direction,
A normal state in which the circumferential groove is located between the seal rings;
One of the seal rings is opposed to the circumferential groove, and the other seal ring can be switched to a drained state where the seal ring is detached from the inner peripheral surface of the drain hole or the outer peripheral surface of the operation shaft. .

このような構成とすれば、操作軸をその軸心方向に移動させることにより、二つのシールリング間に周溝が位置することで二つのシールリングが同時に水抜空隙をシールする通常状態と、一方のシールリングが周溝と対向するとともに他方のシールリングが水抜孔の内周面または操作軸の外周面から外れる水抜状態との切替を行うことができる。このため、通常状態・水抜状態の切替操作時の操作軸の軸心方向の移動距離を１重シールの場合と同様に比較的小さくすることができ、操作力が安定し、使用者の誤認により操作軸の操作を途中で止めることもなくなる。 With such a configuration, by moving the operating shaft in the axial direction, the circumferential groove is positioned between the two seal rings, so that the two seal rings simultaneously seal the drainage gap, The seal ring can be switched to a drained state in which the other seal ring is opposed to the circumferential groove and the other seal ring is detached from the inner peripheral surface of the drain hole or the outer peripheral surface of the operation shaft. For this reason, the movement distance in the axial direction of the operation shaft at the time of switching operation between the normal state and the drainage state can be made relatively small as in the case of the single seal, the operation force is stabilized, and the user is misidentified. There is no need to stop the operation of the operation axis.

通水経路と外部とを連通する水抜孔内にその軸心方向に沿って移動可能に挿通された操作軸と、前記水抜孔の内周面と前記操作軸の外周面との間に前記軸心方向に沿って設けられた水抜空隙と、前記水抜空隙をシールするため前記水抜孔の内周面または前記操作軸の外周面の一方に互いに前記軸心方向に離れた状態で嵌装された二つのシールリングと、前記シールリング間の前記水抜孔の内周面及び前記操作軸の外周面にそれぞれ形成されたテーパ部または段差部と、を備え、
前記操作軸を前記軸心方向に移動させることにより、
前記シールリング間に前記テーパ部または前記段差部が位置する通常状態と、
一方の前記シールリングが前記テーパ部または前記段差部に臨むとともに他方の前記シールリングが前記水抜孔の内周面または前記操作軸の外周面から外れる水抜状態と、に切替可能であることを特徴とする。
An operation shaft that is movably inserted along the axial direction in a drain hole that communicates the water passage with the outside, and the shaft between the inner peripheral surface of the drain hole and the outer peripheral surface of the operation shaft. In order to seal the drainage gap provided along the center direction and the drainage gap, the drainage hole is fitted to one of the inner peripheral surface of the drainage hole and the outer peripheral surface of the operation shaft in a state separated from each other in the axial direction. Two seal rings, and taper portions or step portions formed respectively on the inner peripheral surface of the drain hole between the seal rings and the outer peripheral surface of the operation shaft,
By moving the operation shaft in the axial direction,
A normal state in which the tapered portion or the stepped portion is located between the seal rings;
One of the seal rings faces the tapered portion or the stepped portion, and the other seal ring can be switched to a drained state in which the drain hole is detached from the inner peripheral surface of the drain hole or the outer peripheral surface of the operation shaft. And

このような構成とすれば、操作軸をその軸心方向に移動させることにより、二つのシールリング間にテーパ部または段差部が位置して二つのシールリングが同時に水抜空隙をシールする通常状態と、一方のシールリングがテーパ部または段差部に臨むとともに他方のシールリングが水抜孔の内周面または操作軸の外周面から外れる水抜状態とに切り替えることができる。このため、通常状態・水抜状態の切替操作時の操作軸の軸心方向の移動距離を１重シールの場合と同様に比較的小さくすることができ、操作力が安定し、使用者の誤認により操作軸の操作を途中で止めることもなくなる。 With such a configuration, by moving the operating shaft in the axial direction, a tapered portion or a stepped portion is located between the two seal rings, and the two seal rings simultaneously seal the drain gap. In addition, it is possible to switch to a drained state in which one seal ring faces the tapered portion or the stepped portion and the other seal ring is detached from the inner peripheral surface of the drain hole or the outer peripheral surface of the operation shaft. For this reason, the movement distance in the axial direction of the operation shaft at the time of switching operation between the normal state and the drainage state can be made relatively small as in the case of the single seal, the operation force is stabilized, and the user is misidentified. There is no need to stop the operation of the operation axis.

ここで、逆止弁を収納した筒体を前記通水経路内に前記操作軸とともに移動可能に配置し、前記通常状態では前記筒体の外周と前記通水経路の内周とはシールされ、前記水抜状態では前記シールの少なくとも一部が解除され前記筒体の外周と前記通水経路の内周との間に逆流経路が形成される構成とすることができる。 Here, the cylindrical body containing the check valve is movably disposed in the water passage along with the operation shaft, and in the normal state, the outer circumference of the cylindrical body and the inner circumference of the water passage are sealed, In the drained state, at least a part of the seal is released, and a backflow path can be formed between the outer periphery of the cylinder and the inner periphery of the water passage.

このような構成とすれば、水抜栓と逆止弁とが一体化されるため水抜栓のコンパクト化を図ることができ、水抜栓の開閉操作に伴って逆止弁の機能を解除・復帰させることができるため、開閉操作も楽になる。 With this configuration, the water drain plug and the check valve are integrated so that the water drain plug can be made compact, and the function of the check valve is released / returned when the water drain plug is opened / closed. Can be opened and closed easily.

また、前記水抜孔を構成する外周部材に当該水抜孔の軸心を中心軸とする雄ネジ部を形成し、前記雄ネジ部と螺合する雌ネジ部を有する操作部を、当該雌ネジ部を前記雄ネジ部に螺合させた状態で前記操作軸に取り付け、前記操作部の回転操作により前記操作軸が前記軸心方向に移動する構成とすることもできる。 In addition, an external thread portion having a central axis about the axial center of the drain hole is formed on the outer peripheral member constituting the drain hole, and an operation portion having a female thread portion screwed with the male thread portion is provided as the female thread portion. Can be attached to the operating shaft in a state of being screwed to the male threaded portion, and the operating shaft can be moved in the axial direction by a rotating operation of the operating portion.

このような構成とすれば、水抜孔を構成する外周部材を操作軸の軸心方向の移動手段として利用することができるため、操作軸の軸心方向のコンパクト化を図ることができる。 With such a configuration, since the outer peripheral member constituting the drain hole can be used as a moving means in the axial direction of the operation shaft, the operation shaft can be made compact in the axial direction.

本発明により、通常状態と水抜状態との切替操作時の操作軸の軸心方向の移動距離が比較的小さく、操作力が変動しないので、水抜状態から通常状態への切替操作時に使用者が操作軸の操作を途中で止めるおそれもない、水抜栓を提供することができる。 According to the present invention, the movement distance in the axial direction of the operation shaft at the time of switching operation between the normal state and the drained state is relatively small and the operation force does not fluctuate, so that the user can operate the switch operation from the drained state to the normal state. It is possible to provide a water drain plug that does not have a risk of stopping the operation of the shaft halfway.

以下、図面に基づいて、本発明の実施の形態について説明する。図１は本発明の第１実施形態である水抜栓が組み込まれた混合水栓及び給湯水経路を示す一部省略正面図、図２は図１に示す逆止弁筐体付近の拡大図、図３は図２に示す逆止弁筐体に組み込まれた水抜栓の通常状態を示す垂直断面図、図４は図３に示す水抜栓の水抜状態を示す垂直断面図である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially omitted front view showing a mixing faucet incorporating a water faucet and a hot water supply path according to a first embodiment of the present invention, and FIG. 2 is an enlarged view of the vicinity of a check valve housing shown in FIG. 3 is a vertical cross-sectional view showing a normal state of the water drain plug incorporated in the check valve housing shown in FIG. 2, and FIG. 4 is a vertical cross-sectional view showing a water drain state of the water drain plug shown in FIG.

図１に示すように、取付面１４に設置された湯水混合栓１１に湯水を供給するために配管された給湯管１２及び給水管１３にそれぞれ逆止弁筐体１７が配置されている。図２，図３に示すように、逆止弁筐体１７は開口部１７ｅを有する有底円筒形状の部材であり、その周壁部分に入水口１５と出水口１６とが開設され、内部に設けられた通水経路１７ａに逆止弁２７を収納した筒体２４が収納されている。逆止弁筐体１７の開口部１７ｅに取り付けられた蓋体１９に水抜栓１０及びその操作部１８などが設けられている。 As shown in FIG. 1, a check valve housing 17 is disposed in each of a hot water supply pipe 12 and a water supply pipe 13 that are piped for supplying hot water to a hot and cold mixing tap 11 installed on the mounting surface 14. As shown in FIGS. 2 and 3, the check valve housing 17 is a bottomed cylindrical member having an opening 17e, and a water inlet 15 and a water outlet 16 are opened in the peripheral wall portion and provided inside. A cylindrical body 24 storing the check valve 27 is stored in the water passage 17a. The lid 19 attached to the opening 17e of the check valve housing 17 is provided with the water drain plug 10 and its operation section 18 and the like.

湯水混合栓１１の右側方に設けられた操作レバー１１ａを左右に傾動させると吐出口１１ｂからの吐水・止水が行われ、操作レバー１１ａを前後に傾動させることにより吐出口１１ｂから吐出される湯水の温度調節を行う。また、吐出口１１ｂ上方のタッチスイッチ１１ｃを押圧することによって吐水・止水を行うこともできる。 When the operation lever 11a provided on the right side of the hot and cold water mixing tap 11 is tilted to the left and right, water is discharged and stopped from the discharge port 11b, and is discharged from the discharge port 11b by tilting the operation lever 11a back and forth. Adjust the temperature of hot water. Moreover, water discharge and water stop can also be performed by pressing the touch switch 11c above the discharge port 11b.

図３に示すように、逆止弁筐体１７内の通水経路１７ａと外部とを連通する水抜孔１９ｆが蓋体１９の軸心Ｘと同軸上に設けられ、水抜孔１９ｆ内に軸心Ｘ方向に沿って移動可能に操作軸２０が挿通され、水抜孔１９ｆの内周面１９ａと操作軸２０の外周面２０ｅとの間に水抜空隙Ｓが設けられている。この水抜空隙Ｓをシールするため、操作軸２０の外周面２０ｅに互いに軸心Ｘ方向に離れた状態で二つのシールリング２２ａ，２２ｂが嵌装され、水抜孔１９ｆの内周面１９ａにシールリング２２ａ，２２ｂ間の距離より狭幅の周溝１９ｂが設けられている。二つのシールリング２２ａ，２２ｂは、操作軸２０の外周面２０ｅに設けられた周溝２０ｃ，２０ｄにそれぞれ嵌入されている。 As shown in FIG. 3, a water drain hole 19f that communicates the water passage 17a in the check valve housing 17 with the outside is provided coaxially with the axis X of the lid body 19, and the shaft center in the water drain hole 19f. The operation shaft 20 is inserted so as to be movable along the X direction, and a water drain gap S is provided between the inner peripheral surface 19a of the water drain hole 19f and the outer peripheral surface 20e of the operation shaft 20. In order to seal this drain gap S, two seal rings 22a and 22b are fitted to the outer peripheral surface 20e of the operating shaft 20 in the state of being separated from each other in the axial center X direction, and the seal ring is attached to the inner peripheral surface 19a of the drain hole 19f. A circumferential groove 19b narrower than the distance between 22a and 22b is provided. The two seal rings 22a and 22b are fitted in circumferential grooves 20c and 20d provided on the outer peripheral surface 20e of the operation shaft 20, respectively.

蓋体１９の片端外周に設けられた雄ネジ部１９ｅを、逆止弁筐体１７の開口部１７ｅ内周に設けられた雌ネジ部１７ｄに螺合させることによって蓋体１９が逆止弁筐体１７の開口部１７ｅに取り付けられている。逆止弁筐体１７の開口部１７ｅ内周と蓋体１９の外周との間にはシールリング２３が配置されている。また、蓋体１９の片端から突出した操作軸２０の拡径端部２０ａに、逆止弁２７を収納した筒体２４が止め輪２６によって取り付けられている。筒体２４の外周に設けられた周溝２４ａにはシールリング２５が配置されている。 By screwing a male screw portion 19e provided on the outer periphery of one end of the lid body 19 into a female screw portion 17d provided on the inner periphery of the opening portion 17e of the check valve housing 17, the lid body 19 is attached to the check valve housing. It is attached to the opening 17 e of the body 17. A seal ring 23 is disposed between the inner periphery of the opening 17 e of the check valve housing 17 and the outer periphery of the lid body 19. Further, a cylindrical body 24 containing a check valve 27 is attached to a diameter-enlarged end portion 20 a of the operation shaft 20 protruding from one end of the lid body 19 by a retaining ring 26. A seal ring 25 is disposed in a circumferential groove 24 a provided on the outer periphery of the cylindrical body 24.

一方、蓋体１９の他端外周に設けられた雄ネジ部１９ｃに、キャップ形状をした操作部１８内周に設けられた雌ネジ部１８ｂを螺合させた状態で、操作部１８が蓋体１９の他端に取り付けられている。このとき、蓋体１９の他端から突出した操作軸２０の縮径部２０ｂが操作部１８の係止孔１８ｃを貫通した状態で操作部１８が取り付けられ、係止孔１８ｃから外へ突出した縮径部２０ｂに止め輪２１を装着することによって操作部１８が操作軸２０の縮径部２０ｂに固定されている。また、操作部１８の係止孔１８ｃの周りには複数の貫通孔１８ａが開設されている。 On the other hand, in a state where the male screw portion 19c provided on the inner periphery of the cap-shaped operation portion 18 is screwed to the male screw portion 19c provided on the outer periphery of the other end of the lid body 19, the operation portion 18 is the lid body. 19 is attached to the other end. At this time, the operating portion 18 is attached in a state where the reduced diameter portion 20b of the operating shaft 20 protruding from the other end of the lid body 19 penetrates the locking hole 18c of the operating portion 18, and protrudes outward from the locking hole 18c. The operating portion 18 is fixed to the reduced diameter portion 20b of the operating shaft 20 by attaching the retaining ring 21 to the reduced diameter portion 20b. A plurality of through holes 18 a are formed around the locking hole 18 c of the operation unit 18.

図３に示す通常状態においては、操作軸２０の外周面２０ｅに嵌装された二つのシールリング２２ａ，２２ｂの間に水抜孔１９ｆの周溝１９ｂが位置しているため、これらのシールリング２２ａ，２２ｂにより水抜空隙Ｓの二箇所がシールされている。このとき、逆止弁２７を収納した筒体２４の周溝２４ａ内のシールリング２５は、通水経路１７ａの縮径部１７ｂ内周面に密着している。従って、図１に示す湯水混合栓１１の操作レバー１１ａの操作に応じて入水口１５から通水経路１７ａへ流入した水は逆止弁２７を通過して出水口１６から流出することはできるが、入水口１５への逆流及び水抜空隙Ｓから外部への流出は不可能である。 In the normal state shown in FIG. 3, since the peripheral groove 19b of the drain hole 19f is located between the two seal rings 22a and 22b fitted on the outer peripheral surface 20e of the operation shaft 20, these seal rings 22a. , 22b seals two locations of the drainage gap S. At this time, the seal ring 25 in the circumferential groove 24a of the cylindrical body 24 that houses the check valve 27 is in close contact with the inner circumferential surface of the reduced diameter portion 17b of the water passage 17a. Accordingly, water that has flowed into the water passage 17a from the water inlet 15 in response to the operation of the operation lever 11a of the hot-water mixing tap 11 shown in FIG. 1 can flow out of the water outlet 16 through the check valve 27. The reverse flow to the water inlet 15 and the outflow from the drainage gap S to the outside are impossible.

次に、操作部１８を軸心Ｘ中心に反時計周りに回転操作すると、雌ネジ部１８ｂと雄ネジ部１９ｃとの螺合により、操作部１８は操作軸２０を蓋体１９の水抜孔１９ｆから引き抜く方向へ移動していく。このような回転操作により、操作軸２０は軸心Ｘに沿って外側（図３の図面左側）へ移動し、やがて図４に示す水抜状態となる。 Next, when the operation portion 18 is rotated counterclockwise about the axis X, the operation portion 18 causes the operation shaft 20 to move the operation shaft 20 to the drain hole 19f of the lid body 19 by screwing between the female screw portion 18b and the male screw portion 19c. Move in the direction of pulling out. By such a rotation operation, the operation shaft 20 moves to the outside (left side of the drawing in FIG. 3) along the axis X, and eventually enters the drained state shown in FIG.

図４に示す水抜状態においては、一方のシールリング２２ｂが周溝１９ｂと対向するとともに、他方のシールリング２２ａが水抜孔１９ｆの拡径開口部１９ｄより外へ移動して内周面１９ａから外れシールが解除された状態となる。このとき、逆止弁２７を収納した筒体２４も軸心Ｘに沿って外側（図４の図面左側）へ移動するので、シールリング２５が通水経路１７ａの縮径部１７ｂ内周面から離脱して拡径部１７ｃへ移動する。 In the drained state shown in FIG. 4, one seal ring 22b faces the circumferential groove 19b, and the other seal ring 22a moves out of the enlarged opening 19d of the drain hole 19f and comes off the inner peripheral surface 19a. The seal is released. At this time, the cylindrical body 24 housing the check valve 27 also moves outward (on the left side of the drawing in FIG. 4) along the axis X, so that the seal ring 25 extends from the inner peripheral surface of the reduced diameter portion 17b of the water passage 17a. It disengages and moves to the enlarged diameter portion 17c.

図４に示す水抜状態になると、通水経路１７ａは水抜空隙Ｓを介して外部と連通した状態となるため、通水経路１７ａとその上方に位置する給水管１３及び湯水混合栓１１（図１参照）の内部に存在する水は、筒体２４と逆止弁筐体１７の内周面との隙間及び水抜空隙Ｓを通過して拡径開口部１９ｄから外へ流出し、操作部１８の貫通孔１８ａなどを通過して排出される。 When the water draining state shown in FIG. 4 is reached, the water passage 17a is in communication with the outside via the water drainage gap S, and therefore the water passage 17a, the water supply pipe 13 and the hot and cold water mixing plug 11 (FIG. 1) located above the water passage 17a. The water existing inside the reference valve casing 17 flows out of the enlarged diameter opening 19d through the gap between the cylindrical body 24 and the inner peripheral surface of the check valve housing 17 and the drainage gap S, and flows out of the operation section 18. It passes through the through hole 18a and is discharged.

通水経路１７ａ、給水管１３及び湯水混合栓１１の内部の水が全て排出され「水抜」が完了したら、操作部１８を軸心Ｘ中心に時計周りに回転操作すると、雌ネジ部１８ｂと雄ネジ部１９ｃとの螺合により、操作部１８は操作軸２０を蓋体１９の水抜孔１９ｆ内へ挿入する方向へ移動させ、やがて図３に示す通常状態に復帰する。 When all the water inside the water passage 17a, the water supply pipe 13 and the hot and cold water mixing tap 11 has been drained and the "drainage" has been completed, when the operation part 18 is rotated clockwise around the axis X, the female thread part 18b and male By the screwing with the screw portion 19c, the operation portion 18 moves the operation shaft 20 in a direction to be inserted into the drain hole 19f of the lid body 19, and eventually returns to the normal state shown in FIG.

このように、水抜栓１０は、操作部１８を回転させ操作軸２０を軸心Ｘ方向に進退移動させることにより、二つのシールリング２２ａ，２２ｂ間に周溝１９ｂが位置する通常状態と、一方のシールリング２２ｂが周溝１９ｂと対向するとともに、他方のシールリング２２ａが水抜孔１９ｆの内周面１９ａから外れる水抜状態と、に切替可能である。従って、通常状態・水抜状態の切替操作時の操作軸２０の軸心Ｘ方向の移動距離を１重シールの場合と同様に比較的小さくすることができる。また、操作部１８の回転操作に要する力は略一定で安定しているため、使用者の誤認により操作部１８の回転操作を途中で止めることもない。 As described above, the water drain plug 10 rotates the operation portion 18 and moves the operation shaft 20 forward and backward in the direction of the axis X, thereby causing the normal state in which the circumferential groove 19b is located between the two seal rings 22a and 22b. The seal ring 22b is opposed to the circumferential groove 19b, and the other seal ring 22a can be switched to a drained state where the seal ring 22b is detached from the inner peripheral surface 19a of the drain hole 19f. Therefore, the movement distance in the axis X direction of the operation shaft 20 during the switching operation between the normal state and the drainage state can be made relatively small as in the case of the single seal. Further, since the force required for the rotation operation of the operation unit 18 is substantially constant and stable, the rotation operation of the operation unit 18 is not stopped halfway due to a user's misidentification.

また、本実施形態においては、逆止弁２７を収納した筒体２４を通水経路１７ａ内に操作軸２０とともに移動可能に配置し、通常状態では筒体２４の外周と通水経路１７ａの縮径部１７ｂ内周とはシールリング２５でシールされ、水抜状態ではシールリング２５が縮径部１７ｂ内周から離脱してシールが解除され、筒体２４の外周と通水経路１７ａの内周との間に逆流経路が形成される構成としている。従って、水抜栓１０と逆止弁２７とが一体化され、水抜栓１０のコンパクト化を図ることができる。また、水抜栓１０の開閉操作に伴って逆止弁２７の機能を解除・復帰させることができるため、開閉操作も楽になる。 Further, in the present embodiment, the cylinder body 24 containing the check valve 27 is disposed so as to be movable along with the operation shaft 20 in the water passage 17a, and in a normal state, the outer periphery of the cylinder body 24 and the water passage path 17a are contracted. The inner periphery of the diameter portion 17b is sealed by the seal ring 25. In the drained state, the seal ring 25 is detached from the inner periphery of the reduced diameter portion 17b and the seal is released, and the outer periphery of the cylindrical body 24 and the inner periphery of the water passage 17a A backflow path is formed between the two. Therefore, the water drain plug 10 and the check valve 27 are integrated, and the water drain plug 10 can be made compact. Further, since the function of the check valve 27 can be released / returned along with the opening / closing operation of the drain plug 10, the opening / closing operation is facilitated.

一方、水抜孔１９ｆを構成する外周部材である蓋体１９に当該水抜孔１９ｆの軸心Ｘを中心軸とする雄ネジ部１９ｃを形成し、雄ネジ部１９ｃと螺合する雌ネジ部１８ｂを有する操作部１８をその雌ネジ部１８ｂを雄ネジ部１９ｃに螺合させた状態で操作軸２０に取り付けている。これにより、水抜孔１９ｆを構成する蓋体１９を操作軸２０の軸心Ｘ方向の移動手段として利用することができるため、軸心Ｘ方向のコンパクト化を図ることができる。 On the other hand, a male threaded portion 19c having a central axis X of the axial center X of the drainage hole 19f is formed in the lid body 19 which is an outer peripheral member constituting the drainage hole 19f, and a female threaded portion 18b screwed with the male threaded portion 19c is formed. The operation portion 18 having the female screw portion 18b is attached to the operation shaft 20 with the female screw portion 18b screwed to the male screw portion 19c. Thereby, since the cover body 19 which comprises the drain hole 19f can be utilized as a movement means of the axial center X direction of the operating shaft 20, compactization of the axial center X direction can be achieved.

なお、本実施形態の水抜栓１０においては、操作軸２０の外周面２０ｅに二つのシールリング２２ａ，２２ｂを嵌装し、水抜孔１９ｆの内周面１９ａに周溝１９ｂを設けているが、これに限定するものではないので、二つのシールリングを水抜孔の内周面に嵌装し、操作軸の外周面に周溝を設けた構成とすることも可能であり、これによって前述と同様の作用効果を得ることができる。 In the drain plug 10 of the present embodiment, the two seal rings 22a and 22b are fitted on the outer peripheral surface 20e of the operation shaft 20, and the peripheral groove 19b is provided on the inner peripheral surface 19a of the water drain hole 19f. Since it is not limited to this, it is possible to adopt a configuration in which two seal rings are fitted to the inner peripheral surface of the drain hole and a peripheral groove is provided on the outer peripheral surface of the operation shaft. The effect of this can be obtained.

次に、図５，図６に基づいて、本発明の第２実施形態について説明する。図５は本発明の第２実施形態である水抜栓の通常状態を示す垂直断面図、図６は図５に示す水抜栓の水抜状態を示す垂直断面図である。なお、図５，図６に示す水抜栓などにおいて、前述した水抜栓１０などの構成部分と同じ構造、機能を有する部分は図１〜図４と同符号を付して説明を省略する。 Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a vertical cross-sectional view showing a normal state of a water drain plug according to a second embodiment of the present invention, and FIG. 6 is a vertical cross-sectional view showing a water drain state of the water drain plug shown in FIG. 5 and 6, parts having the same structure and function as those of the constituent parts such as the water stopper 10 described above are denoted by the same reference numerals as those in FIGS. 1 to 4 and description thereof is omitted.

図５に示すように、逆止弁筐体１７内の通水経路１７ａと外部とを連通する水抜孔３９ｆが蓋体３９の軸心Ｘと同軸上に設けられ、水抜孔３９ｆ内に軸心Ｘ方向に沿って移動可能に操作軸４０が挿通されている。水抜孔３９ｆの内周には、内径の大きな大径部３９ａと、これより内径の小さな小径部３９ｂと、大径部３９ａと小径部３９ｂとの間に形成された雌型テーパ部３９ｇと、拡径開口部３９ｄと、が設けられている。 As shown in FIG. 5, a water drain hole 39f that communicates the water flow path 17a in the check valve housing 17 with the outside is provided coaxially with the axis X of the lid 39, and the shaft center in the water drain hole 39f. An operation shaft 40 is inserted so as to be movable along the X direction. On the inner periphery of the drain hole 39f, a large diameter portion 39a having a large inner diameter, a small diameter portion 39b having a smaller inner diameter, a female taper portion 39g formed between the large diameter portion 39a and the small diameter portion 39b, An enlarged diameter opening 39d is provided.

操作軸４０の外周には、外径の大きな太径部４０ｅと、これより外径の小さな細径部４０ｆと、太径部４０ｅと細径部４０ｆとの間に形成された雄型テーパ部４０ｇと、が設けられている。また、操作軸４０における太径部４０ｅ外周の軸心Ｘ方向の中央付近に周溝４０ｃが設けられ、細径部４０ｆ外周の雄型テーパ部４０ｇ近傍に周溝４０ｄが設けられている。周溝４０ｃ，４０ｄには、それぞれの外径に適合したサイズのシールリング３２ａ，３２ｂが嵌装されている。 On the outer periphery of the operation shaft 40, a large diameter portion 40e having a large outer diameter, a small diameter portion 40f having a smaller outer diameter, and a male tapered portion formed between the large diameter portion 40e and the small diameter portion 40f. 40 g are provided. Further, a circumferential groove 40c is provided in the vicinity of the center in the axis X direction of the outer periphery of the large diameter portion 40e in the operation shaft 40, and a circumferential groove 40d is provided in the vicinity of the male tapered portion 40g on the outer periphery of the small diameter portion 40f. In the circumferential grooves 40c and 40d, seal rings 32a and 32b having sizes suitable for the respective outer diameters are fitted.

水抜孔３９ｆの大径部３９ａ、雌型テーパ部３９ｇ及び小径部３９ｂのそれぞれの内周面と、操作軸４０の太径部４０ｅ、雄型テーパ部４０ｇ及び細径部４０ｆのそれぞれの外周面との間に水抜空隙Ｓが設けられている。周溝４０ｃ，４０ｄに嵌入されたシールリング３２ａ，３２ｂは水抜空隙Ｓをシールするための部材である。 The inner peripheral surfaces of the large diameter portion 39a, the female taper portion 39g and the small diameter portion 39b of the drain hole 39f, and the outer peripheral surfaces of the large diameter portion 40e, the male taper portion 40g and the small diameter portion 40f of the operation shaft 40, respectively. A drainage gap S is provided between the two. The seal rings 32a and 32b fitted into the circumferential grooves 40c and 40d are members for sealing the drainage gap S.

蓋体３９の片端外周の雄ネジ部３９ｅを、逆止弁筐体１７の開口部１７ｅ内周の雌ネジ部１７ｄに螺合させることによって蓋体３９が逆止弁筐体１７の開口部１７ｅに取り付けられている。逆止弁筐体１７の開口部１７ｅ内周と蓋体３９の外周との間にはシールリング２３が配置されている。また、蓋体３９の片端から突出した操作軸４０の縮径端部４０ａに螺着された接続部材４１に、逆止弁２７を収納した筒体２４が止め輪３６によって取り付けられている。筒体２４外周の周溝２４ａにシールリング２５が配置されている。 The lid 39 is screwed into the female threaded portion 17d on the inner periphery of the opening 17e of the check valve housing 17 by screwing the male threaded portion 39e on the outer periphery of the lid 39 into the opening 17e of the check valve housing 17. Is attached. A seal ring 23 is disposed between the inner periphery of the opening 17 e of the check valve housing 17 and the outer periphery of the lid 39. Further, a cylindrical body 24 containing a check valve 27 is attached by a retaining ring 36 to a connecting member 41 screwed to a reduced diameter end portion 40 a of the operation shaft 40 protruding from one end of the lid 39. A seal ring 25 is disposed in a circumferential groove 24 a on the outer periphery of the cylindrical body 24.

蓋体３９の他端外周の雄ネジ部３９ｃに、キャップ形状の操作部３８内周の雌ネジ部３８ｂを螺合させた状態で、操作部３８が蓋体３９の他端に取り付けられている。このとき、蓋体３９の他端から突出した操作軸４０の縮径部４０ｂが操作部３８の係止孔３８ｃを貫通した状態で操作部３８が取り付けられ、係止孔３８ｃから外へ突出した縮径部４０ｂに止め輪３１を装着することによって操作部３８が操作軸４０の縮径部４０ｂに固定されている。また、操作部３８の係止孔３８ｃの周りには複数の貫通孔３８ａが開設されている。 The operating portion 38 is attached to the other end of the lid 39 in a state where the female screw portion 38b on the inner periphery of the cap-shaped operating portion 38 is screwed into the male screw portion 39c on the outer periphery of the other end of the lid 39. . At this time, the operation portion 38 is attached in a state where the reduced diameter portion 40b of the operation shaft 40 protruding from the other end of the lid body 39 penetrates the locking hole 38c of the operation portion 38, and protrudes outward from the locking hole 38c. The operating portion 38 is fixed to the reduced diameter portion 40b of the operating shaft 40 by attaching the retaining ring 31 to the reduced diameter portion 40b. A plurality of through holes 38 a are formed around the locking hole 38 c of the operation portion 38.

図５に示す通常状態においては、操作軸４０の外周面に嵌装された二つのシールリング３２ａ，３２ｂの間に雄型テーパ部４０ｇ及び雌型テーパ部３９ｇが位置しているため、これらのシールリング３２ａ，３２ｂにより水抜空隙Ｓの二箇所がシールされている。このとき、逆止弁２７を収納した筒体２４の周溝２４ａ内のシールリング２５は、通水経路１７ａの縮径部１７ｂ内周面に密着している。入水口１５から通水経路１７ａへ流入した水は逆止弁２７を通過して出水口１６から流出できるが、入水口１５への逆流及び水抜空隙Ｓから外部への流出は不可能である。 In the normal state shown in FIG. 5, the male taper portion 40g and the female taper portion 39g are located between the two seal rings 32a and 32b fitted on the outer peripheral surface of the operation shaft 40. Two portions of the drainage gap S are sealed by the seal rings 32a and 32b. At this time, the seal ring 25 in the circumferential groove 24a of the cylindrical body 24 that houses the check valve 27 is in close contact with the inner circumferential surface of the reduced diameter portion 17b of the water passage 17a. The water that has flowed into the water passage 17a from the water inlet 15 can pass through the check valve 27 and flow out from the water outlet 16. However, the reverse flow to the water inlet 15 and the outflow from the drainage gap S are impossible.

次に、操作部３８を軸心Ｘ中心に反時計周りに回転操作すると、雌ネジ部３８ｂと雄ネジ部３９ｃとの螺合により、操作部３８は操作軸４０を蓋体３９の水抜孔３９ｆから引き抜く方向へ移動していく。これに伴い、操作軸４０は軸心Ｘに沿って外側（図５の紙面左側）へ移動し、やがて図６に示す水抜状態となる。 Next, when the operation portion 38 is rotated counterclockwise about the axis X, the operation portion 38 causes the operation shaft 40 to move the operation shaft 40 to the drain hole 39f of the lid 39 by screwing between the female screw portion 38b and the male screw portion 39c. Move in the direction of pulling out. Along with this, the operation shaft 40 moves to the outside (left side in FIG. 5) along the axis X, and eventually enters the drained state shown in FIG.

図６に示す水抜状態においては、一方のシールリング３２ｂが雌型テーパ部３９ｇ及び太径部３９ａに臨む状態となって空間Ｇが生じるとともに、他方のシールリング３２ａが水抜孔３９ｆの拡径開口部３９ｄより外へ移動して太径部３９ａ内周面から外れ、シールが解除された状態となる。このとき、逆止弁２７を収納した筒体２４も軸心Ｘに沿って外側（図６の紙面左側）へ移動するので、シールリング２５が通水経路１７ａの縮径部１７ｂ内周面から離脱して拡径部１７ｃへ移動する。 In the drained state shown in FIG. 6, one seal ring 32b faces the female taper portion 39g and the large diameter portion 39a to create a space G, and the other seal ring 32a has an enlarged opening of the drain hole 39f. It moves outside from the portion 39d and comes off the inner peripheral surface of the large diameter portion 39a, and the seal is released. At this time, the cylindrical body 24 housing the check valve 27 also moves outward (on the left side in FIG. 6) along the axis X, so that the seal ring 25 extends from the inner peripheral surface of the reduced diameter portion 17b of the water passage 17a. It disengages and moves to the enlarged diameter portion 17c.

図６に示す水抜状態になると、通水経路１７ａは水抜空隙Ｓ及び空間Ｇを介して外部と連通した状態となるため、通水経路１７ａとその上方に配管された給水管や湯水混合栓の内部に存在する水は、筒体２４と逆止弁筐体１７の内周面との隙間及び水抜空隙Ｓを通過して拡径開口部３９ｄから外へ流出し、操作部３８の貫通孔３８ａなどを通過して排出される。 When the water draining state shown in FIG. 6 is reached, the water passage 17a communicates with the outside through the water draining gap S and the space G. Therefore, the water passage 17a and the water supply pipe and hot water mixing plug piped thereabove are connected. The water present inside passes through the gap between the cylindrical body 24 and the inner peripheral surface of the check valve housing 17 and the drainage gap S and flows out from the enlarged diameter opening 39d, and passes through the through hole 38a of the operation section 38. It is discharged after passing through.

通水経路１７ａ内部などの水が全て排出され「水抜」が完了したら、操作部３８を軸心Ｘ中心に時計周りに回転操作すると、雌ネジ部３８ｂと雄ネジ部３９ｃとの螺合により、操作部３８は操作軸４０を蓋体３９の水抜孔３９ｆ内へ挿入する方向へ移動させ、やがて図５に示す通常状態に復帰する。 When all the water inside the water passage 17a and the like is drained and the "drainage" is completed, when the operation portion 38 is rotated clockwise around the axis X, the screwing of the female screw portion 38b and the male screw portion 39c The operation unit 38 moves the operation shaft 40 in the direction of insertion into the drain hole 39f of the lid 39, and eventually returns to the normal state shown in FIG.

このように、水抜栓３０は、操作部３８を回転操作して操作軸４０を軸心Ｘ方向に移動させることにより、シールリング３２ａ，３２ｂ間に雌型テーパ部３９ｇ及び雄型テーパ部４０ｇが位置する通常状態と、一方のシールリング３２ｂが雌型テーパ部３９ｇに臨むとともに他方のシールリング３２ａが水抜孔３９ｆの拡径開口部３９ｄ内周面から外れる水抜状態と、に切替可能である。 As described above, the drain plug 30 rotates the operation portion 38 and moves the operation shaft 40 in the axial center X direction, so that the female taper portion 39g and the male taper portion 40g are located between the seal rings 32a and 32b. It is possible to switch between a normal state in which the seal ring 32b is positioned and a drainage state in which one seal ring 32b faces the female taper portion 39g and the other seal ring 32a is disengaged from the inner peripheral surface of the enlarged diameter opening portion 39d of the drain hole 39f.

従って、通常状態・水抜状態の切替操作時の操作軸４０の軸心Ｘ方向の移動距離を１重シールの場合と同様に比較的小さくすることができる。また、操作部３８の回転操作に要する力は略一定で安定しているため、使用者の誤認により操作部３８の回転操作を途中で止めることもない。その他の作用効果は前述した水抜栓１０と同様である。 Therefore, the movement distance in the axis X direction of the operation shaft 40 during the switching operation between the normal state and the drainage state can be made relatively small as in the case of the single seal. Further, since the force required for the rotation operation of the operation unit 38 is substantially constant and stable, the rotation operation of the operation unit 38 is not stopped halfway due to a user's misconception. Other functions and effects are the same as those of the water tap 10 described above.

なお、本実施形態の水抜栓３０においては、平常状態において、シールリング３２ａ，３２ｂ間に位置する水抜孔３９ｆの内周面及び操作軸４０の外周面にそれぞれ雌型テーパ部３９ｇ及び雄型テーパ部４０ｇを設けているが、これに限定するものではないので、前記テーパ部と略同じ位置にそれぞれ段差部を設けた構成とすることも可能であり、これによって前述と同様の作用効果を得ることができる。 In the water drain plug 30 of the present embodiment, in a normal state, a female taper portion 39g and a male taper taper are formed on the inner peripheral surface of the water drain hole 39f located between the seal rings 32a and 32b and the outer peripheral surface of the operation shaft 40, respectively. Although the portion 40g is provided, but not limited to this, it is possible to adopt a configuration in which step portions are provided at substantially the same positions as the tapered portion, thereby obtaining the same effects as described above. be able to.

本発明の水抜栓は、寒冷地などにおける水栓の凍結破損を防止する器具として広く利用することができる。 The water drain plug of the present invention can be widely used as an instrument for preventing freezing damage of the water tap in a cold region.

本発明の第１実施形態である水抜栓が組み込まれた混合水栓及び給湯水経路を示す一部省略正面図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially omitted front view showing a mixing faucet and a hot water supply path in which a water faucet according to a first embodiment of the present invention is incorporated. 図１に示す逆止弁筐体付近の拡大図である。FIG. 2 is an enlarged view of the vicinity of a check valve housing shown in FIG. 1. 図２に示す逆止弁筐体に組み込まれた水抜栓の通常状態を示す垂直断面図である。FIG. 3 is a vertical sectional view showing a normal state of a water drain plug incorporated in the check valve housing shown in FIG. 2. 図３に示す水抜栓の水抜状態を示す垂直断面図である。FIG. 4 is a vertical sectional view showing a drained state of the drain plug shown in FIG. 3. 本発明の第２実施形態である水抜栓の通常状態を示す垂直断面図である。It is a vertical sectional view showing the normal state of the water tap which is the second embodiment of the present invention. 図５に示す水抜栓の水抜状態を示す垂直断面図である。FIG. 6 is a vertical sectional view showing a drained state of the drain plug shown in FIG. 5.

符号の説明Explanation of symbols

１０，３０水抜栓
１１湯水混合栓
１１ａ操作レバー
１１ｂ吐出口
１１ｃタッチスイッチ
１２給湯管
１３給水管
１４取付面
１５入水口
１６出水口
１７逆止弁筐体
１７ａ通水経路
１７ｂ，２０ｂ，４０ｂ縮径部
１７ｃ拡径部
１７ｄ，１８ｂ，３８ｂ雌ネジ部
１７ｅ開口部
１８，３８操作部
１８ａ，３８ａ貫通孔
１８ｃ，３８ｃ係止孔
１９，３９蓋体
１９ａ内周面
１９ｂ，２０ｃ，２０ｄ，２４ａ，４０ｃ，４０ｄ周溝
１９ｃ，１９ｅ，３９ｃ，３９ｅ雄ネジ部
１９ｄ，３９ｄ拡径開口部
１９ｆ，３９ｆ水抜孔
２０，４０操作軸
２０ａ拡径端部
２０ｅ外周面
２２ａ，２２ｂ，２３，２５，３２ａ，３２ｂシールリング
２４筒体
２１，２６，３６止め輪
２７逆止弁
３９ａ大径部
３９ｂ小径部
３９ｄ拡径開口部
３９ｇ雌型テーパ部
４０ａ縮径端部
４０ｅ太径部
４０ｆ細径部
４０ｇ雄型テーパ部
４１接続部材
Ｇ空間
Ｓ水抜空隙
Ｘ軸心 DESCRIPTION OF SYMBOLS 10, 30 Drain plug 11 Hot water mixing tap 11a Operation lever 11b Discharge port 11c Touch switch 12 Hot water supply pipe 13 Water supply pipe 14 Mounting surface 15 Water inlet 16 Water outlet 17 Check valve housing 17a Water flow path 17b, 20b, 40b Reduced diameter Portion 17c Expanded portion 17d, 18b, 38b Female thread portion 17e Opening portion 18, 38 Operation portion 18a, 38a Through hole 18c, 38c Locking hole 19, 39 Lid 19a Inner peripheral surface 19b, 20c, 20d, 24a, 40c , 40d Circumferential groove 19c, 19e, 39c, 39e Male thread 19d, 39d Expanded opening 19f, 39f Drain hole 20, 40 Operation shaft 20a Expanded end 20e Outer peripheral surface 22a, 22b, 23, 25, 32a, 32b Seal ring 24 Cylinder 21, 26, 36 Retaining ring 27 Check valve 39a Large diameter portion 39b Small diameter portion 39d Expansion Opening 39g female tapered portion 40a reduced diameter end portion 40e thick portion 40f narrowed portion 40g male tapered portion 41 connecting member G space S drainage space X axis

Claims

通水経路と外部とを連通する水抜孔内にその軸心方向に沿って移動可能に挿通された操作軸と、前記水抜孔の内周面と前記操作軸の外周面との間に前記軸心方向に沿って設けられた水抜空隙と、前記水抜空隙をシールするため前記水抜孔の内周面または前記操作軸の外周面の一方に互いに前記軸心方向に離れた状態で嵌装された二つのシールリングと、前記シールリングが嵌装されていない方の前記水抜孔の内周面または前記操作軸の外周面に設けられた前記シールリング間距離より狭幅の周溝と、を備え、
前記操作軸を前記軸心方向に移動させることにより、
前記シールリング間に前記周溝が位置する通常状態と、
一方の前記シールリングが前記周溝と対向するとともに、他方の前記シールリングが前記水抜孔の内周面または前記操作軸の外周面から外れる水抜状態と、に切替可能であることを特徴とする水抜栓。 An operation shaft that is movably inserted along the axial direction in a drain hole that communicates the water passage with the outside, and the shaft between the inner peripheral surface of the drain hole and the outer peripheral surface of the operation shaft. In order to seal the drainage gap provided along the center direction and the drainage gap, the drainage hole is fitted to one of the inner peripheral surface of the drainage hole and the outer peripheral surface of the operation shaft in a state separated from each other in the axial direction. Two seal rings, and a circumferential groove having a narrower width than the distance between the seal rings provided on the inner peripheral surface of the drain hole or the outer peripheral surface of the operation shaft on which the seal ring is not fitted. ,
By moving the operation shaft in the axial direction,
A normal state in which the circumferential groove is located between the seal rings;
One of the seal rings is opposed to the circumferential groove, and the other seal ring can be switched to a drained state where the seal ring is detached from the inner peripheral surface of the drain hole or the outer peripheral surface of the operation shaft. Water tap.

通水経路と外部とを連通する水抜孔内にその軸心方向に沿って移動可能に挿通された操作軸と、前記水抜孔の内周面と前記操作軸の外周面との間に前記軸心方向に沿って設けられた水抜空隙と、前記水抜空隙をシールするため前記水抜孔の内周面または前記操作軸の外周面の一方に互いに前記軸心方向に離れた状態で嵌装された二つのシールリングと、前記シールリング間の前記水抜孔の内周面及び前記操作軸の外周面にそれぞれ形成されたテーパ部または段差部と、を備え、
前記操作軸を前記軸心方向に移動させることにより、
前記シールリング間に前記テーパ部または前記段差部が位置する通常状態と、
一方の前記シールリングが前記テーパ部または前記段差部に臨むとともに他方の前記シールリングが前記水抜孔の内周面または前記操作軸の外周面から外れる水抜状態と、に切替可能であることを特徴とする水抜栓。 An operation shaft that is movably inserted along the axial direction in a drain hole that communicates the water passage with the outside, and the shaft between the inner peripheral surface of the drain hole and the outer peripheral surface of the operation shaft. In order to seal the drainage gap provided along the center direction and the drainage gap, the drainage hole is fitted to one of the inner peripheral surface of the drainage hole and the outer peripheral surface of the operation shaft in a state separated from each other in the axial direction. Two seal rings, and taper portions or step portions formed respectively on the inner peripheral surface of the drain hole between the seal rings and the outer peripheral surface of the operation shaft,
By moving the operation shaft in the axial direction,
A normal state in which the tapered portion or the stepped portion is located between the seal rings;
One of the seal rings faces the tapered portion or the stepped portion, and the other seal ring can be switched to a drained state in which the drain hole is detached from the inner peripheral surface of the drain hole or the outer peripheral surface of the operation shaft. A water drainer.

逆止弁を収納した筒体を前記通水経路内に前記操作軸とともに移動可能に配置し、前記通常状態では前記筒体の外周と前記通水経路の内周とはシールされ、前記水抜状態では前記シールの少なくとも一部が解除され前記筒体の外周と前記通水経路の内周との間に逆流経路が形成されることを特徴とする請求項１または２記載の水抜栓。 A cylinder containing a check valve is movably disposed in the water passage with the operation shaft, and in the normal state, the outer periphery of the cylinder and the inner circumference of the water passage are sealed, and the water drained state according to claim 1 or 2 drain tap according to, characterized in that the backflow passage is formed between the inner periphery of the outer peripheral and the water flow path of at least a part is released the cylindrical body of the seal.

前記水抜孔を構成する外周部材に当該水抜孔の軸心を中心軸とする雄ネジ部を形成し、前記雄ネジ部と螺合する雌ネジ部を有する操作部を、当該雌ネジ部を前記雄ネジ部に螺合させた状態で前記操作軸に取り付け、前記操作部の回転操作により前記操作軸が前記軸心方向に移動することを特徴とする請求項１〜３のいずれかに記載の水抜栓。 A male screw portion having a central axis about the axis of the drain hole is formed on the outer peripheral member constituting the drain hole, and an operation portion having a female screw portion screwed with the male screw portion is provided as the female screw portion. attached to the operating shaft in a state that is screwed to the male screw portion, wherein the operating shaft by the rotation operation of the operation unit according to any one of claims 1-3, characterized in that to move the axial direction Water tap.