JP2008196603A - Pipe joint - Google Patents

Pipe joint Download PDF

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JP2008196603A
JP2008196603A JP2007032479A JP2007032479A JP2008196603A JP 2008196603 A JP2008196603 A JP 2008196603A JP 2007032479 A JP2007032479 A JP 2007032479A JP 2007032479 A JP2007032479 A JP 2007032479A JP 2008196603 A JP2008196603 A JP 2008196603A
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valve
fluid passage
cylinder
socket
peripheral surface
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JP5090750B2 (en
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Hiroya Katagiri
寛也 片桐
Masakazu Kojima
政和 小島
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NEW MACHINE CO Ltd
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NEW MACHINE CO Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To increase a flow by securing stable and smooth flow of fluid when an opening and closing valve is provided in a fluid passage while suppressing increase in dimensions of a joint body. <P>SOLUTION: A pipe joint is equipped with a socket 1 and a plug 2. In a socket bodies 1' and a plug body 2', fluid passages 30, 130 in which opening and closing valves 40, 140 are provided are formed by taper holes the inner peripheral surfaces of which are linearly and continuously expanding from rear end openings 30a, 130a toward front end openings 30b, 130b. In the opening and closing valves 40, 140, the tip parts of the leg parts 41a, 141a of valve body holding bodies 41, 141 are held and fixed by opening and closing valve receiving parts 49, 149 formed by the front end surfaces 10a, 110a of the rear cylinders 10, 110 and surfaces 23a, 123a on the inner peripheral surfaces of the coupling holes 23, 123 of the front cylinders 20, 120. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、冷却水などの流体を通流させる配管同士を接続する互いに結合されるソケットとプラグを有する管継手に関する。   The present invention relates to a pipe joint having a socket and a plug that are connected to each other and connect pipes through which a fluid such as cooling water flows.

従来より、例えば冷却水などの流体を通流させる配管（管路）同士を接続するための管継手として、互いに結合されるソケットとプラグとを備え、これらソケット及びプラグが継手本体（すなわち、ソケット本体及びプラグ本体）の内部に流体を流す流体通路を設けるとともに、この流体通路の内部に通路の開閉を行うための開閉弁を設けたものが知られている。   Conventionally, as a pipe joint for connecting pipes (pipe lines) through which a fluid such as cooling water flows, for example, a socket and a plug that are coupled to each other are provided, and the socket and the plug are connected to a joint body (that is, a socket). 2. Description of the Related Art A fluid passage that allows a fluid to flow inside a main body and a plug body) and an on-off valve for opening and closing the passage are provided inside the fluid passage.

このような継手本体は、通常、一端部（後端部）に配管を接続するための接続孔（配管接続部）が形成され、他端部（前端部）にソケットまたはプラグを結合する結合部が形成されるとともにこの結合部の近傍に開閉弁の弁体が閉動作時に密接する弁座が形成された構造からなる。そして、流体通路は、これら接続孔と弁座とを結ぶように継手本体の軸方向に沿って形成され、流体通路の後端開口が接続孔に接するとともに前端開口が弁座に接するように構成されている。   Such a joint body is usually formed with a connection hole (pipe connection part) for connecting a pipe to one end part (rear end part), and a coupling part for connecting a socket or a plug to the other end part (front end part). And a valve seat in which the valve body of the on-off valve is in close contact during the closing operation is formed in the vicinity of the coupling portion. The fluid passage is formed along the axial direction of the joint body so as to connect the connection hole and the valve seat, and the rear end opening of the fluid passage is in contact with the connection hole and the front end opening is in contact with the valve seat. Has been.

また、流体通路は、その直径が接続孔の直径により規定される大きさで、かつ軸方向全体にわたり直径がほぼ一定の大きさとなるように形成されるため、継手本体の軸方向に沿ってほぼ平行な内周面を有するいわゆるストレート孔として形成されることが多い。   Further, the fluid passage is formed so that the diameter thereof is defined by the diameter of the connection hole and the diameter is substantially constant over the entire axial direction, so that the fluid passage is substantially along the axial direction of the joint body. It is often formed as a so-called straight hole having parallel inner peripheral surfaces.

このような従来の管継手は、継手本体（ソケット本体及びプラグ本体）と、開閉弁とが、開閉弁をストレート孔である流体通路内に設けるに適した構造となっている。すなわち、開閉弁の弁体保持体を継手本体の軸方向に沿った内周面に固定し、この弁体保持体によって弁体を軸方向に進退自在に保持する構成となっている。   In such a conventional pipe joint, the joint body (socket body and plug body) and the on-off valve have a structure suitable for providing the on-off valve in a fluid passage that is a straight hole. That is, the valve body holding body of the on-off valve is fixed to the inner peripheral surface along the axial direction of the joint body, and the valve body is held by the valve body holding body so as to be able to advance and retract in the axial direction.

例えば、特許文献１に開示された管継手は、開閉弁を保持する弁体保持体として、外周部に支持用の脚部を有し、各脚部に前後を貫通する流通溝を形成した筒体を用いている。継手本体は、前部筒体と後部筒体とに分割可能で両者を螺合して結合するもので、流体通路の内周面において軸方向に対向する前部筒体の後端面と後部筒体の前端面との間で弁体保持体の脚部を挟持固定する。弁体は、弁体保持体の内部に移動自在に配置され、コイルばねによって弁座に向けて付勢されている。   For example, the pipe joint disclosed in Patent Document 1 is a cylinder having a supporting leg portion on the outer peripheral portion as a valve body holding body for holding an on-off valve, and a circulation groove penetrating front and rear in each leg portion. Using the body. The joint body can be divided into a front cylindrical body and a rear cylindrical body, and both are coupled by screwing. The rear end surface and the rear cylinder of the front cylindrical body facing each other in the axial direction on the inner peripheral surface of the fluid passage. The leg portion of the valve body holder is clamped and fixed between the front end surface of the body. The valve body is movably disposed inside the valve body holder and is biased toward the valve seat by a coil spring.

また、特許文献２に開示された管継手は、開閉弁を保持する弁体保持体として、貫通孔の周囲に放射状に並んだ状態で傾斜をつけて折り曲げた複数の弾性爪を形成したものを用いている。継手本体の流体通路の内周面には、周方向に沿って係止溝が形成してある。弁体保持体は、継手本体の流体通路に配置され、弾性爪の先端が流体通路の係止溝に挿入されて弾性力によって係止固定されている。弁体は、弁体保持体の貫通孔に移動可能に挿通されてコイルばねによって弁座に向けて付勢されている。   In addition, the pipe joint disclosed in Patent Document 2 is a valve body holding body for holding an on-off valve in which a plurality of elastic claws are formed by being inclined and bent in a state of being radially arranged around a through hole. Used. A locking groove is formed along the circumferential direction on the inner peripheral surface of the fluid passage of the joint body. The valve body holder is disposed in the fluid passage of the joint body, and the tip of the elastic claw is inserted into the locking groove of the fluid passage and is locked and fixed by an elastic force. The valve body is movably inserted into the through hole of the valve body holder and is urged toward the valve seat by a coil spring.

さらに、特許文献３に開示された管継手は、開閉弁を保持する弁体保持体として、円筒部の外周側に放射状に突出する突起部を有するガイド体を用いている。弁体保持体は、継手本体の流体通路に配置され、突起部の流体通路の軸方向に沿う先端面が流体通路の内周面に軸方向に当接され、各突起部の後側面が流体通路の内周面に形成された環状溝に係止された止め環に当接されている。弁体は、弁体保持体の円筒部に移動自在に挿通され、弁体保持体の突起部に支持されたコイルばねによって弁座に向けて移動可能に配置されている。このコイルばねは、弁体保持体の突起部を止め環に押し付けている。   Furthermore, the pipe joint disclosed in Patent Document 3 uses a guide body having a projecting portion projecting radially on the outer peripheral side of the cylindrical portion as a valve body holding body for holding the on-off valve. The valve body holder is disposed in the fluid passage of the joint body, the tip surface of the protrusion in the axial direction of the fluid passage is in contact with the inner peripheral surface of the fluid passage in the axial direction, and the rear side of each protrusion is fluid It abuts on a retaining ring locked in an annular groove formed on the inner peripheral surface of the passage. The valve body is movably inserted into the cylindrical portion of the valve body holder, and is arranged so as to be movable toward the valve seat by a coil spring supported by the protrusion of the valve body holder. This coil spring presses the protrusion of the valve body holder against the retaining ring.

実公平３−１９６７０号公報Japanese Utility Model Publication No. 3-19670 特開２００４−３２４７６７号公報JP 2004-324767 A 特開２００４−２５１４０８号公報JP 2004-251408 A

しかしながら、上述した従来の管継手では、継手本体の外形寸法の大型化を抑えつつ流体通路の断面積を拡大して流体通路を流れる流体の流量を増加させることが困難であるという問題がある。   However, the conventional pipe joint described above has a problem that it is difficult to increase the flow rate of the fluid flowing through the fluid passage by enlarging the cross-sectional area of the fluid passage while suppressing an increase in the outer dimension of the joint body.

すなわち、従来の管継手のように流体通路がストレート孔である場合は、流体通路を流れる流体の流量を増加させようとすると、必然的に外形寸法も大きくしなければならなくなる。また、流体通路の前端開口には、閉動作時に開閉弁の弁体が密接する径方向内側に突出する弁座が連続して設けられているため、弁座の部分の断面積で外形寸法が決まってしまい、小型化を推し進めるには限界があるという問題がある。   That is, in the case where the fluid passage is a straight hole as in the conventional pipe joint, if the flow rate of the fluid flowing through the fluid passage is to be increased, the outer dimensions must be increased. In addition, a valve seat that protrudes radially inward, in close contact with the valve body of the on-off valve during the closing operation, is continuously provided at the front end opening of the fluid passage. There is a problem that there is a limit to push for downsizing.

本発明は、上述した問題点に鑑みてなされたもので、継手本体の外形寸法の大型化を抑えるとともに流体の流量を増加させることができる管継手を提供することを目的とする。   The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a pipe joint capable of suppressing an increase in the outer dimension of a joint body and increasing a fluid flow rate.

本発明に係る管継手は、互いに結合するソケットおよびプラグを有する管継手において、前記ソケットおよびプラグの少なくとも一方は両端を開放した筒状をなす継手本体と、この継手本体の内部に装着される開閉弁とを備え、前記継手本体は、一端部に設けられて配管を接続する配管接続部と、他端部に設けられて相手部材を結合する結合部と、この結合部の近傍に形成されて継手本体の径方向内部へ向けて突出して周方向に延びる環状の弁座と、前記配管接続部から前記弁座にかけて形成された流体通路とを有し、この流体通路の直径が前記配管接続部から前記弁座にかけて徐々に拡大するものであり、前記開閉弁は、前記流体通路の内部に配置されて前記流体通路の内周面に保持される脚部を有する弁体保持体と、この弁体保持体に継手本体の軸方向に沿って進退自在に保持されて前進時に周縁部が前記弁座に密接する弁体と、前記弁体保持体と前記弁体との間に設けられ前記弁体に対して前記弁座に押し付ける向きの力を付与する弾性部材とを備えたものであることを特徴とする。   A pipe joint according to the present invention is a pipe joint having a socket and a plug coupled to each other, and at least one of the socket and the plug has a tubular joint body with both ends open, and an open / close mounted inside the joint body. The joint body is formed in the vicinity of the coupling portion provided at one end portion to connect the pipe, the coupling portion provided at the other end portion to couple the mating member, and An annular valve seat that protrudes radially inward of the joint body and extends in the circumferential direction, and a fluid passage formed from the pipe connection portion to the valve seat, the diameter of the fluid passage being the pipe connection portion The valve body gradually expands from the valve seat to the valve seat, and the open / close valve is disposed inside the fluid passage and has a leg body that is held on the inner peripheral surface of the fluid passage, and the valve Transfer to body holder A valve body which is held so as to be movable back and forth along the axial direction of the main body and whose peripheral edge is in close contact with the valve seat when moving forward, and is provided between the valve body holding body and the valve body, and It is provided with the elastic member which provides the force of the direction pressed against a valve seat.

本発明の一つの実施形態によれば、前記継手本体は、他端部の外周面に第１のねじ部が形成された第１の筒体と、一端部に前記第１の筒体の他端部が挿入されるとともにこの一端部の内周面に前記第１のねじ部と螺合する第２のねじ部が形成された第２の筒体とを結合して構成され、前記弁体保持体は、その脚部が前記第１の筒体の他端部に当接して前記弾性部材によって前記第１の筒体の他端部に押し付けられている構成とされている。   According to one embodiment of the present invention, the joint main body includes a first cylinder having a first threaded portion formed on the outer peripheral surface of the other end, and the first cylinder other than the first cylinder. The valve body is configured by coupling an end portion and a second cylinder body having a second screw portion screwed to the first screw portion on an inner peripheral surface of the one end portion. The holding body is configured such that the leg portion is in contact with the other end portion of the first cylinder body and is pressed against the other end portion of the first cylinder body by the elastic member.

また、本発明の他の実施形態においては、前記継手本体は、前記流体通路の直径が前記配管接続部から前記弁座にかけて滑らかに連続的に拡大されている。   In another embodiment of the present invention, in the joint body, the diameter of the fluid passage is smoothly and continuously enlarged from the pipe connection portion to the valve seat.

本発明によれば、流体通路を継手本体の配管接続部から弁座にかけて、内径が徐々に拡大するいわゆるテーパ孔としている。このため、流体通路の断面積を配管接続部から弁座側に向けて拡大させることができ、従来のストレート孔と比較して通路面積を拡大して流体通路を流れる流体の流量を増加させることが可能となる。また、継手本体の外形寸法を従来のストレート孔の場合と比較して全体的に小さくすることができる。そして、流体は、流体通路のテーパ面をなす内周面に沿って安定して円滑に流れる。特に、流体通路の内径が配管接続部から弁座にかけて滑らかに連続的に拡大されていると、流体通路を流れる流体をさらに一層その内周面に沿って安定して円滑に流すことができ、流路抵抗を少なくして流量を増加させることができる。   According to the present invention, the fluid passage is a so-called tapered hole whose inner diameter gradually increases from the pipe connection portion of the joint body to the valve seat. For this reason, the cross-sectional area of the fluid passage can be enlarged from the pipe connection portion toward the valve seat side, and the passage area can be enlarged as compared with the conventional straight hole to increase the flow rate of the fluid flowing through the fluid passage. Is possible. Further, the overall dimensions of the joint body can be made smaller as compared with the case of the conventional straight hole. The fluid flows stably and smoothly along the inner peripheral surface forming the tapered surface of the fluid passage. In particular, when the inner diameter of the fluid passage is smoothly and continuously enlarged from the pipe connection portion to the valve seat, the fluid flowing through the fluid passage can be further stably and smoothly flowed along the inner peripheral surface thereof, The flow rate can be increased by reducing the channel resistance.

以下、添付の図面を参照して、本発明の実施の形態を説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１は、本発明の一実施形態に係る管継手におけるソケットおよびプラグの分離時の様子を一部を断面で示す側面図である。また、図２は、これらソケットおよびプラグの結合時の様子を一部を断面で示す側面図である。   FIG. 1 is a side view showing a part in cross-section of a socket and a plug in a pipe joint according to an embodiment of the present invention. FIG. 2 is a side view partially showing a cross-sectional view of the socket and the plug when coupled.

図１および図２に示すように、本実施形態に係る管継手は、筒状のソケット１と、このソケット１に着脱可能に挿入結合される筒状のプラグ２とを備えて構成され、例えば水などの流体を流通する管路同士を接続する。ソケット１およびプラグ２は、それぞれ継手本体（ソケット本体１’およびプラグ本体２’）と、この継手本体の内部に設けられた開閉弁４０，１４０とを備えて構成される。   As shown in FIGS. 1 and 2, the pipe joint according to the present embodiment is configured to include a cylindrical socket 1 and a cylindrical plug 2 that is detachably inserted into the socket 1. Connect pipes that circulate fluid such as water. The socket 1 and the plug 2 are each configured by including a joint body (socket body 1 ′ and plug body 2 ′), and on-off valves 40 and 140 provided inside the joint body.

ソケット１は、例えば後部筒体（第１の筒体）１０と前部筒体（第２の筒体）２０とを軸方向に並べて結合して構成され、両端を開放した筒体をなすとともに内部に流体通路３０を有するソケット本体１’と、このソケット本体１’の流体通路３０に設けられた開閉弁４０と、前部筒体２０の内部に挿入される相手部材であるプラグ２の前端部との接続をロックするロック手段（結合部）２１と、後部筒体１０の内部に挿入されるホースなどの配管（管路）９０１をソケット本体１’に接続する接続手段（配管接続部）１１とを備えて構成される。   The socket 1 is constituted by, for example, a rear cylindrical body (first cylindrical body) 10 and a front cylindrical body (second cylindrical body) 20 that are arranged side by side in the axial direction, and forms a cylindrical body with both ends open. A socket body 1 ′ having a fluid passage 30 therein, an on-off valve 40 provided in the fluid passage 30 of the socket body 1 ′, and a front end of a plug 2 which is a mating member inserted into the front cylinder 20 Locking means (coupling part) 21 for locking the connection with the part, and connecting means (pipe connection part) for connecting a pipe (pipe) 901 such as a hose inserted into the rear cylinder 10 to the socket body 1 ′ 11.

ソケット本体１’の後部筒体１０は、両端が開放された円筒体をなすもので、前端部（他端部：前部筒体２０との結合部）に流体通路３０の一部を構成する第１通路１２が、後端部（一端部：前部筒体２０との結合部と反対側）に接続孔１３が、それぞれ同軸形成されている。   The rear cylinder 10 of the socket main body 1 ′ forms a cylindrical body whose both ends are open, and constitutes a part of the fluid passage 30 at the front end (the other end: a connecting portion with the front cylinder 20). As for the 1st channel | path 12, the connection hole 13 is coaxially formed in the rear-end part (one end part: the other side of the coupling | bond part with the front part cylinder body 20), respectively.

第１通路１２は、後部筒体１０の軸方向中央部から前端部にかけて直径が直線的で連続的に拡大するテーパ孔をなすものである。   The first passage 12 forms a tapered hole whose diameter is linear and continuously expands from the center in the axial direction of the rear cylinder 10 to the front end.

この第１通路１２の後端開口は、接続孔１３の直径とほぼ同一の直径を有している。また、接続孔１３は、流体を流す配管９０１の外形に応じた直径を有するストレート孔である。ソケット本体１’の後部筒体１０の外周面には、中間ナット１４を挟んで前端部にねじ部（第１のねじ部）１５が、後端部にねじ部１６がそれぞれ形成されている。なお、後部筒体１０の前端部の外周面は、直径が一定の大きさで軸方向と平行に延びる面を構成している。   The rear end opening of the first passage 12 has a diameter substantially the same as the diameter of the connection hole 13. The connection hole 13 is a straight hole having a diameter corresponding to the outer shape of the pipe 901 through which the fluid flows. On the outer peripheral surface of the rear cylindrical body 10 of the socket body 1 ′, a threaded portion (first threaded portion) 15 is formed at the front end with a middle nut 14 interposed therebetween, and a threaded portion 16 is formed at the rear end. Note that the outer peripheral surface of the front end portion of the rear cylinder 10 forms a surface having a constant diameter and extending parallel to the axial direction.

一方、ソケット本体１’の前部筒体２０は、両端が開放された円筒体をなすもので、前端部（プラグ２との接続側）にプラグ本体２’が挿入されるプラグ挿入空間２２が形成され、このプラグ挿入空間２２の後端側（前部筒体２０の中間部）に流体通路３０の他の一部を構成する第２通路２９が形成されている。また、この第２通路２９の軸方向後端側に後部筒体１０が結合される結合孔２３が、軸方向前端側に後述する開閉弁４０の弁体４２に密接する弁座２４が、それぞれ同軸形成されている。   On the other hand, the front cylindrical body 20 of the socket main body 1 ′ is a cylindrical body whose both ends are open, and a plug insertion space 22 into which the plug main body 2 ′ is inserted at the front end (on the connection side with the plug 2) is provided. A second passage 29 is formed on the rear end side of the plug insertion space 22 (intermediate portion of the front cylinder 20). The second passage 29 forms another part of the fluid passage 30. In addition, a coupling hole 23 for coupling the rear cylinder 10 to the axial rear end side of the second passage 29 has a valve seat 24 in close contact with a valve body 42 of an on-off valve 40 described later on the axial front end side, respectively. Coaxially formed.

プラグ挿入空間２２は、上述したようにプラグ本体２’の前端部が挿入される凹状の空間であり、プラグ２の前端部の外形寸法（外径）に対応した直径および奥行き寸法を有している。第２通路２９は、結合孔２３の前端開口と弁座２４の後端開口との間に形成された前部筒体２０の軸方向中央部から前端部にかけて直径が直線的で連続的に拡大するテーパ孔をなすものである。なお、第２通路２９の前端開口の直径は、弁座２４の後端開口の直径と同じ大きさとなるように形成されている。   The plug insertion space 22 is a concave space into which the front end portion of the plug body 2 ′ is inserted as described above, and has a diameter and a depth dimension corresponding to the outer dimension (outer diameter) of the front end portion of the plug 2. Yes. The second passage 29 has a diameter that is linear and continuously expands from the center in the axial direction to the front end of the front cylinder 20 formed between the front end opening of the coupling hole 23 and the rear end opening of the valve seat 24. It forms a tapered hole. The diameter of the front end opening of the second passage 29 is formed to be the same as the diameter of the rear end opening of the valve seat 24.

結合孔２３は、後部筒体１０の前端部が挿入結合される（この前端部に外周側から嵌合される）孔で、この後部筒体１０の前端部の外周面を囲む内周面が軸方向と平行に延びる面をなすように形成されている。すなわち、結合孔２３は、軸方向にわたる面の全体が挿入される後部筒体１０の前端部の外径に応じた直径を有し、且つ後部筒体１０の前端部の軸方向長さ（後部筒体１０の前端開口と中間ナット１４の前側の側面との間の長さ）より大きい軸方向の長さを有して構成されている。   The coupling hole 23 is a hole in which the front end portion of the rear cylindrical body 10 is inserted and coupled (fitted to the front end portion from the outer peripheral side), and the inner peripheral surface surrounding the outer peripheral surface of the front end portion of the rear cylindrical body 10 is It is formed so as to form a surface extending parallel to the axial direction. That is, the coupling hole 23 has a diameter corresponding to the outer diameter of the front end portion of the rear cylinder 10 into which the entire surface extending in the axial direction is inserted, and the axial length (rear portion) of the front end portion of the rear cylinder 10. The length between the front end opening of the cylinder 10 and the front side surface of the intermediate nut 14 is larger than the axial length).

この結合孔２３の内周面には、上述した後部筒体１０の前端部のねじ部１５と螺合するねじ部（第２のねじ部）２５と、このねじ部２５に対して軸方向の前端側にて内周面の周方向に沿って形成された環状の溝からなるリング受け部２６とがそれぞれ設けられ、このリング受け部２６にはシールリングとしてのＯリング２７が嵌め込まれている。   On the inner peripheral surface of the coupling hole 23, a screw portion (second screw portion) 25 that is screwed with the screw portion 15 of the front end portion of the rear cylinder 10 described above, and an axial direction with respect to the screw portion 25. A ring receiving portion 26 formed of an annular groove formed along the circumferential direction of the inner peripheral surface is provided on the front end side, and an O-ring 27 serving as a seal ring is fitted into the ring receiving portion 26. .

弁座２４は、流体通路３０に設けられた開閉弁４０の弁体４２の周縁部が閉動作時に密接するもので、前部筒体２０のプラグ挿入空間２２と第２通路２９との間の位置に周方向に沿って環状に形成されている。この弁座２４の第２通路２９に面する側面は、プラグ挿入空間２２から第２通路２９にかけて直径が拡大するテーパ状をなす弁座面２４ａを構成する。   The valve seat 24 is configured such that the peripheral portion of the valve body 42 of the on-off valve 40 provided in the fluid passage 30 is in close contact during the closing operation, and is between the plug insertion space 22 of the front cylinder 20 and the second passage 29. It is formed in an annular shape at a position along the circumferential direction. A side surface of the valve seat 24 facing the second passage 29 constitutes a valve seat surface 24 a having a tapered shape whose diameter increases from the plug insertion space 22 to the second passage 29.

このように構成されたソケット本体１’における後部筒体１０および前部筒体２０は同一軸上に配置して、後部筒体１０の前端部と前部筒体２０の後端部とを向かい合わせて、後部筒体１０の前端部を前部筒体２０の結合孔２３に挿入し、後部筒体１０のねじ部１５と結合孔２３のねじ部２５とで螺合することにより結合される。本例のソケット１では、こうして後部筒体１０と前部筒体２０を結合することによってソケット本体１’が構成される構造を備えている。   The rear cylinder 10 and the front cylinder 20 in the socket body 1 ′ thus configured are arranged on the same axis, and face the front end of the rear cylinder 10 and the rear end of the front cylinder 20. In addition, the front end portion of the rear cylinder body 10 is inserted into the coupling hole 23 of the front cylinder body 20 and is coupled by screwing with the screw portion 15 of the rear cylinder body 10 and the screw portion 25 of the coupling hole 23. . The socket 1 of this example has a structure in which the socket body 1 ′ is configured by joining the rear cylinder 10 and the front cylinder 20 in this way.

また、ソケット本体１’における前部筒体２０の結合孔２３の内周面と後部筒体１０の外周面とで構成される筒体結合部においては、両筒体１０，２０のねじ部１５，２５に対して後部筒体１０の前端開口に近い位置で、前部筒体２０のリング受け部２６に嵌め込んだＯリング２７が加圧状態で後部筒体１０の前端部の外周面に密接する。このため、この筒体結合部からは、流体通路３０を流れる流体は流出しない。なお、ソケット本体１’の後部筒体１０および前部筒体２０は、この筒体結合部においてロックボルト２８により締着され一体的に固定される。   Further, in the cylindrical body coupling portion constituted by the inner circumferential surface of the coupling hole 23 of the front cylindrical body 20 and the outer circumferential surface of the rear cylindrical body 10 in the socket main body 1 ′, the screw portions 15 of both the cylindrical bodies 10 and 20. , 25 at a position near the front end opening of the rear cylinder 10, an O-ring 27 fitted into the ring receiving portion 26 of the front cylinder 20 is applied to the outer peripheral surface of the front end of the rear cylinder 10 in a pressurized state. Closely. For this reason, the fluid flowing through the fluid passage 30 does not flow out from the cylindrical joint portion. The rear cylinder 10 and the front cylinder 20 of the socket body 1 ′ are fastened and fixed integrally with a lock bolt 28 at the cylinder coupling portion.

このように構成されたソケット本体１’では、後部筒体１０および前部筒体２０が結合されて、後部筒体１０の第１通路１２と前部筒体２０の第２通路２９とが組み合わされて直線的で連続的なテーパ面を構成する流体通路３０が形成される。なお、後部筒体１０の第１通路１２と接続孔１３との境界位置が流体通路３０の後端開口３０ａをなし、前部筒体２０の第２通路２９と弁座２４との境界位置が流体通路３０の前端開口３０ｂをなしている。   In the socket body 1 ′ thus configured, the rear cylinder 10 and the front cylinder 20 are combined, and the first passage 12 of the rear cylinder 10 and the second passage 29 of the front cylinder 20 are combined. As a result, a fluid passage 30 that forms a linear continuous taper surface is formed. The boundary position between the first passage 12 of the rear cylinder 10 and the connection hole 13 forms the rear end opening 30a of the fluid passage 30, and the boundary position between the second passage 29 of the front cylinder 20 and the valve seat 24 is the same. A front end opening 30b of the fluid passage 30 is formed.

この流体通路３０は、上述したように、後端開口３０ａから前端開口３０ｂにかけて直径が直線的で連続的に拡大するテーパ孔として構成されている。すなわち、流体通路３０は、後部筒体１０の接続孔１３と前部筒体２０の弁座２４とを結ぶテーパ面をなす内周面を有するテーパ孔となる。   As described above, the fluid passage 30 is configured as a tapered hole whose diameter is linear and continuously expands from the rear end opening 30a to the front end opening 30b. That is, the fluid passage 30 is a tapered hole having an inner peripheral surface forming a tapered surface connecting the connection hole 13 of the rear cylinder 10 and the valve seat 24 of the front cylinder 20.

また、ソケット本体１’の流体通路３０の内周面における後部筒体１０と前部筒体２０との境界部（すなわち、後部筒体１０の第１通路１２の前端開口と前部筒体２０の第２通路２９の後端開口に挟まれた部分）には、筒体の中心軸に向けて開口しつつ周方向に沿って凹んだ環状に形成された開閉弁受け部４９が設けられている。   Further, the boundary between the rear cylinder 10 and the front cylinder 20 on the inner peripheral surface of the fluid passage 30 of the socket body 1 ′ (that is, the front end opening and the front cylinder 20 of the first passage 12 of the rear cylinder 10). (The portion sandwiched between the rear end openings of the second passage 29) is provided with an on-off valve receiving portion 49 formed in an annular shape that opens toward the central axis of the cylinder and is recessed along the circumferential direction. Yes.

この開閉弁受け部４９は、具体的には、第１通路１２の内周面と交差する流体通路３０の径方向と平行な後部筒体１０の前端面１０ａと、第２通路２９の内周面と交差する結合孔２３の内周面における前端面１０ａから前部筒体２０の前端側に向けて軸方向と平行に延びる面２３ａとによって構成されている。   Specifically, the on-off valve receiver 49 includes a front end surface 10 a of the rear cylinder 10 parallel to the radial direction of the fluid passage 30 intersecting the inner peripheral surface of the first passage 12, and the inner periphery of the second passage 29. It is comprised by the surface 23a extended in parallel with an axial direction toward the front-end side of the front cylinder 20 from the front-end surface 10a in the internal peripheral surface of the coupling hole 23 which cross | intersects a surface.

すなわち、開閉弁受け部４９は、径方向に沿う後端側面（開閉弁受け部４９において流体通路３０の軸方向後端側に位置する側面（後部筒体１０の前端面１０ａ））と、流体通路３０の周方向に沿う外周側面（開閉弁受け部４９において外周側に位置する面（前部筒体２０の結合孔２３の内周面における面２３ａ））とで構成されている。   That is, the on-off valve receiver 49 has a rear end side surface along the radial direction (a side surface (front end surface 10a of the rear cylinder 10) positioned on the rear end side in the axial direction of the fluid passage 30 in the on-off valve receiver 49), It is comprised by the outer peripheral side surface (surface (surface 23a in the inner peripheral surface of the coupling hole 23 of the front cylinder 20) located in the outer peripheral side in the opening-and-closing valve receiving part 49) in alignment with the circumferential direction of the channel | path 30.

図３は、本実施形態に係る管継手のソケット１におけるソケット本体１’の開閉弁受け部４９の構造の例を示す拡大断面図である。図３に示すように、開閉弁受け部４９は、この開閉弁受け部４９に対して流体通路３０の内周面（テーパ面）の直径が大きい側にて、前部筒体２０の結合孔２３の内周面における面２３ａと流体通路３０の内周面３０ｃとが交差する点Ｂが、流体通路３０の内周面（テーパ面）の直径が小さい側にて、後部筒体１０の前端面１０ａと流体通路３０の内周面３０ｄとが交差する点Ａに対して径方向外周側に位置するように形成されている。   FIG. 3 is an enlarged cross-sectional view showing an example of the structure of the on-off valve receiving portion 49 of the socket body 1 ′ in the socket 1 of the pipe joint according to the present embodiment. As shown in FIG. 3, the on-off valve receiver 49 has a coupling hole in the front cylinder 20 on the side where the diameter of the inner peripheral surface (taper surface) of the fluid passage 30 is larger than the on-off valve receiver 49. The point B where the surface 23a of the inner peripheral surface of the fluid passage 23 intersects the inner peripheral surface 30c of the fluid passage 30 is the side where the diameter of the inner peripheral surface (tapered surface) of the fluid passage 30 is smaller. The surface 10a and the inner peripheral surface 30d of the fluid passage 30 are formed so as to be positioned on the outer peripheral side in the radial direction with respect to the point A where the surface 10a intersects.

このため、点Ａと点Ｂとを直線で結ぶと、流体通路３０の後端開口３０ａから前端開口３０ｂにかけて外側へ向けて連続して広がるように傾斜するテーパ面、すなわち後端開口３０ａから前端開口３０ｂにかけて直径が直線的に連続して拡大してゆく仮想のテーパ面Ｃを描くことができる。   For this reason, when the point A and the point B are connected by a straight line, a tapered surface inclined so as to continuously spread outward from the rear end opening 30a of the fluid passage 30 to the front end opening 30b, that is, from the rear end opening 30a to the front end. It is possible to draw a virtual tapered surface C in which the diameter increases linearly and continuously over the opening 30b.

ここで、流体通路３０と開閉弁受け部４９との関係についてさらに細かく説明する。まず、流体通路３０において開閉弁受け部４９に対する後端開口３０ａ側（テーパ径の小さい側）の接続孔１３の前端開口から点Ａまでの間の内周面３０ｄに、流体通路３０の後端開口３０ａから前端開口３０ｂへ向けて直径が直線的で連続的に拡大するテーパ面（開閉弁受け部４９の直線Ｃと同じ傾斜角度を持ったテーパ面）を形成する。すなわち、後部筒体１０の第１通路１２の内周面に、流体通路３０の後端開口３０ａから前端開口３０ｂにかけて外側（ソケット本体１’の軸線から離れる向き）へ向けて直線的で連続的に傾斜していくテーパ面を形成する。   Here, the relationship between the fluid passage 30 and the on-off valve receiver 49 will be described in more detail. First, in the fluid passage 30, the rear end of the fluid passage 30 is formed on the inner peripheral surface 30 d between the front end opening of the connection hole 13 on the rear end opening 30 a side (small taper diameter side) with respect to the opening / closing valve receiver 49 and the point A. A tapered surface (a tapered surface having the same inclination angle as the straight line C of the on-off valve receiving portion 49) is formed in which the diameter is linear and continuously expands from the opening 30a toward the front end opening 30b. That is, on the inner peripheral surface of the first passage 12 of the rear cylinder 10, linearly and continuously from the rear end opening 30 a to the front end opening 30 b of the fluid passage 30 toward the outside (direction away from the axis of the socket body 1 ′). The taper surface which inclines in the direction is formed.

次に、流体通路３０において開閉弁受け部４９に対する前端開口３０ｂ側（テーパ径の大きい側）にて点Ｂから弁座２４の後端側までの間の内周面３０ｃに、流体通路３０の後端開口３０ａから前端開口３０ｂへ向けて直径が直線的で連続的に拡大するテーパ面を形成する。すなわち、前部筒体２０の第２通路２９の内周面に、流体通路３０の後端開口３０ａから前端開口３０ｂにかけて外側へ向けて直線的に連続して傾斜するテーパ面を形成する。この前部筒体２０におけるテーパ面は、テーパ面Ｃの傾斜角度よりもさらに大きな傾斜角度を持って形成する、あるいは直線Ｃと同じ傾斜角度を持って形成する。   Next, in the fluid passage 30, on the inner peripheral surface 30 c between the point B and the rear end side of the valve seat 24 on the front end opening 30 b side (the side with the larger taper diameter) with respect to the on-off valve receiving portion 49, A tapered surface having a diameter linearly and continuously expanding from the rear end opening 30a to the front end opening 30b is formed. That is, a tapered surface is formed on the inner peripheral surface of the second passage 29 of the front cylinder 20 so as to incline linearly and continuously outward from the rear end opening 30a of the fluid passage 30 to the front end opening 30b. The tapered surface of the front cylindrical body 20 is formed with an inclination angle larger than the inclination angle of the tapered surface C, or is formed with the same inclination angle as the straight line C.

このため、流体通路３０の内周面全体は、開閉弁受け部４９に対して流体通路後端開口側に位置するテーパ面３０ａと、開閉弁受け部４９に対して流体通路前端開口側に位置するテーパ面３０ｂをテーパ面Ｃと組み合わせることにより、流体通路３０の後端開口から前端開口にかけて直径が徐々に拡大して外側へ向けて直線的に連続して傾斜するテーパ面に形成することができる。そして、テーパ面３０ａおよびテーパ面３０ｂの傾斜角度がテーパ面Ｃの傾斜角度と同じ大きさである場合には、流体通路３０は、流体通路後端開口側から前端開口側にかけて直径が滑らかに連続して拡大して、外側へ向けて一直線上で滑らかに連続して傾斜する内周面を有するテーパ孔に形成することができる。   Therefore, the entire inner peripheral surface of the fluid passage 30 is positioned on the fluid passage front end opening side with respect to the on-off valve receiving portion 49 and the tapered surface 30a located on the fluid passage rear end opening side with respect to the on-off valve receiving portion 49. By combining the taper surface 30b to be combined with the taper surface C, the diameter gradually increases from the rear end opening to the front end opening of the fluid passage 30 and is formed into a taper surface that is continuously inclined linearly outward. it can. When the inclination angle of the taper surface 30a and the taper surface 30b is the same as the inclination angle of the taper surface C, the fluid passage 30 has a smoothly continuous diameter from the fluid passage rear end opening side to the front end opening side. Thus, it can be formed into a tapered hole having an inner peripheral surface that smoothly and continuously inclines in a straight line toward the outside.

次に、開閉弁４０について説明する。図１および図２に示すように、ソケット本体１’の流体通路３０の内部に設けられた開閉弁４０は、弁体保持体４１と、弁体４２と、弾性部材である圧縮コイルばね４３とを備えて構成されている。   Next, the on-off valve 40 will be described. As shown in FIGS. 1 and 2, the on-off valve 40 provided in the fluid passage 30 of the socket body 1 ′ includes a valve body holding body 41, a valve body 42, and a compression coil spring 43 that is an elastic member. It is configured with.

開閉弁４０の弁体保持体４１は、流体通路３０の内側に配置され、この流体通路３０を形成するソケット本体１’の内周面に、例えば複数の脚部４１ａが保持されるものである。この弁体保持体４１は、円筒体からなり、その前端部が開口されるとともに後端部が閉塞された形状からなる。この弁体保持体４１の後端部には、その中心に弁体保持体４１を軸方向に貫通する連通孔４１ｆが形成されている。   The valve body holding body 41 of the on-off valve 40 is disposed inside the fluid passage 30, and a plurality of leg portions 41 a, for example, are held on the inner peripheral surface of the socket body 1 ′ that forms the fluid passage 30. . The valve body holder 41 is formed of a cylindrical body, and has a shape in which a front end portion is opened and a rear end portion is closed. A communication hole 41 f that penetrates the valve body holder 41 in the axial direction is formed at the center of the rear end portion of the valve body holder 41.

複数の脚部４１ａは、周方向に等間隔となるように弁体保持体４１の外周面から径方向外側へ向けて放射状に延びる短冊形に形成され、流体通路軸方向に並ぶ前側面４１ｂと後側面４１ｃ（図３参照）との間の寸法（厚さ）は、例えば開閉弁受け部４９の面２３ａの軸方向長さ（前部筒体２０の内周面２３における開閉弁受け部４９に面する部分の軸方向長さ）と同じ大きさに設定されている。   The plurality of leg portions 41a are formed in a rectangular shape extending radially outward from the outer peripheral surface of the valve body holder 41 so as to be equally spaced in the circumferential direction, and the front side surface 41b aligned in the fluid passage axial direction The dimension (thickness) between the rear side surface 41c (see FIG. 3) is, for example, the axial length of the surface 23a of the on-off valve receiver 49 (the on-off valve receiver 49 on the inner peripheral surface 23 of the front cylinder 20). Is set to the same size as the axial length of the portion facing the surface.

弁体保持体４１は、流体通路３０の中心軸線上にて後部筒体１０の第１通路１２と前部筒体２０の第２通路２９とに跨るように配置され、各脚部４１ａの先端部が流体通路３０の中間部に形成された開閉弁受け部４９に係合された状態で支持される。この場合、各脚部４１ａの先端部における後側面４１ｃは、開閉弁受け部４９における後部筒体１０の前端面１０ａに当接するとともに、各脚部４１ａの先端部における先端面４１ｄは、開閉弁受け部４９における前部筒体２０の結合孔２３の内周面２３ａに当接する。   The valve body holding body 41 is disposed on the central axis of the fluid passage 30 so as to straddle the first passage 12 of the rear cylinder 10 and the second passage 29 of the front cylinder 20, and the tip of each leg 41a. The portion is supported in a state of being engaged with an on-off valve receiving portion 49 formed in the middle portion of the fluid passage 30. In this case, the rear side surface 41c at the distal end portion of each leg portion 41a abuts on the front end surface 10a of the rear cylindrical body 10 at the on-off valve receiving portion 49, and the front end surface 41d at the distal end portion of each leg portion 41a The receiving portion 49 contacts the inner peripheral surface 23 a of the coupling hole 23 of the front cylindrical body 20.

なお、弁体保持体４１の各脚部４１ａの先端部は、開閉弁受け部４９において前部筒体２０の結合孔２３の内周面２３ａとその先端面４１ｄとが当接可能となるように、結合孔２３の内径に対応した外径となるように形成されている。また、弁体４２の弁体部４２ａは、前部筒体２０において弁座２４で囲まれた空間を閉動作時に閉塞するために、弁座２４の最小内径よりも大きな外径となるように形成されている。   The tip of each leg 41a of the valve body holder 41 can be brought into contact with the inner peripheral surface 23a of the coupling hole 23 of the front cylinder 20 and the tip surface 41d of the opening / closing valve receiver 49. Further, the outer diameter corresponding to the inner diameter of the coupling hole 23 is formed. Further, the valve body 42a of the valve body 42 has an outer diameter larger than the minimum inner diameter of the valve seat 24 in order to close the space surrounded by the valve seat 24 in the front cylinder 20 during the closing operation. Is formed.

弁体４２は、弁体部４２ａと、筒部４２ｂと、前面突部４２ｃとを備えて構成されている。弁体部４２ａは、円盤形をなすもので、その外周縁部にはＯリング４４が取り付けられている。筒部４２ｂは、弁体部４２ａの中心孔４２ｃを囲むとともに弁体部４２ａの後面部から後側へ突出する筒状に形成されている。前面突部４２ｃは、プラグ２との結合時に、プラグ本体２’に備えられた開閉弁１４０の弁体１４２における前面突部１４２ｃと軸方向に当接する。   The valve body 42 includes a valve body portion 42a, a cylindrical portion 42b, and a front projection 42c. The valve body 42a has a disk shape, and an O-ring 44 is attached to the outer peripheral edge thereof. The cylindrical portion 42b is formed in a cylindrical shape that surrounds the center hole 42c of the valve body portion 42a and protrudes rearward from the rear surface portion of the valve body portion 42a. The front protrusion 42c abuts the front protrusion 142c of the valve body 142 of the on-off valve 140 provided in the plug body 2 'in the axial direction when coupled to the plug 2.

弁体部４２ａは、流体通路３０の前端開口３０ｂに連続する弁座２４に囲まれる空間に配置され、筒部４２ｂは、円筒体の弁体保持体４１の前端開口から内部に移動自在に挿入保持されている。このため、筒部４２ｂは、弁体保持体４１に保持されて流体通路軸方向に沿って前後に移動可能に配置され、この筒部４２ｂの移動に伴って弁体部４２ａが弁座２４で囲まれた空間において軸方向に前後に移動する。   The valve body portion 42a is disposed in a space surrounded by the valve seat 24 that is continuous with the front end opening 30b of the fluid passage 30, and the cylindrical portion 42b is movably inserted into the inside from the front end opening of the cylindrical valve body holding body 41. Is retained. For this reason, the cylinder part 42b is hold | maintained at the valve body holding body 41, and is arrange | positioned so that it can move back and forth along a fluid path axial direction, and the valve body part 42a is the valve seat 24 with the movement of this cylinder part 42b. It moves back and forth in the axial direction in the enclosed space.

そして、開閉弁４０の閉動作時には弁体部４２ａの周縁部に設けられたＯリング４４が弁座２４の弁座面２４ａに接触して流体通路３０を閉じるとともに、開動作時にはＯリング４４が弁座面２４ａから離れて弁体部４２ａと弁座面２４ａとの間に隙間が生じ流体通路３０が開かれる。   When the opening / closing valve 40 is closed, the O-ring 44 provided on the peripheral edge of the valve body 42a contacts the valve seat surface 24a of the valve seat 24 to close the fluid passage 30, and at the time of opening, the O-ring 44 is A gap is created between the valve body portion 42a and the valve seat surface 24a away from the valve seat surface 24a, and the fluid passage 30 is opened.

弁体保持体４１と弁体４２の筒部４２ｂとで囲まれた部分には、圧縮コイルばね４３がその伸縮方向が流体通路軸方向に沿うように配置されている。この圧縮コイルばね４３の一端は弁体保持体４１の後端側内壁に当接するとともに、他端は筒部４２ｂの前端側内壁に当接している。弁体保持体４１は、圧縮コイルばね４３の一端によりソケット本体１の後端側へ向けて押圧され、各脚部４１ａの先端部が流体通路３０に設けられた開閉弁受け部４９における後部筒体１０の前端面１０ａに押し付けられる。この状態のときに弁体保持体４１の各脚部４１ａは、開閉弁受け部４９にて保持されるため、弁体保持体４１全体の位置がその位置に固定される。   A compression coil spring 43 is disposed in a portion surrounded by the valve body holding body 41 and the cylindrical portion 42b of the valve body 42 so that the expansion / contraction direction thereof is along the fluid passage axial direction. One end of the compression coil spring 43 is in contact with the inner wall on the rear end side of the valve body holder 41, and the other end is in contact with the inner wall on the front end side of the cylindrical portion 42b. The valve body holding body 41 is pressed toward the rear end side of the socket body 1 by one end of the compression coil spring 43, and the front end portion of each leg portion 41 a is a rear cylinder in the on-off valve receiving portion 49 provided in the fluid passage 30. It is pressed against the front end surface 10 a of the body 10. Since each leg part 41a of the valve body holding body 41 is hold | maintained by the on-off valve receiving part 49 in this state, the position of the valve body holding body 41 whole is fixed to the position.

弁体４２には、圧縮コイルばね４３の他端の反発力を受けて流体通路３０の前端開口３０ｂ側（すなわち、弁座２４側）へ押し付ける向きの力が付与される。このため、弁体４２は弁座２４へ向けて前進移動してＯリング４４が弁座面２４ａと接触して停止される。このとき、弁体４２は、前部筒体２０の弁座２４で囲まれた空間の開口を覆って流体通路３０の前端開口３０ｂ側を閉じた状態となる。   The valve body 42 receives a repulsive force at the other end of the compression coil spring 43 and is given a force in a direction to push it toward the front end opening 30b side of the fluid passage 30 (that is, the valve seat 24 side). For this reason, the valve body 42 moves forward toward the valve seat 24, and the O-ring 44 comes into contact with the valve seat surface 24a and is stopped. At this time, the valve body 42 is in a state of covering the opening of the space surrounded by the valve seat 24 of the front cylinder 20 and closing the front end opening 30b side of the fluid passage 30.

開閉弁４０は、図１に示すようにソケット１とプラグ２とを結合していないときは、圧縮コイルばね４３に押された弁体４２が弁座２４にＯリング４４を介して接触し流体通路３０を閉じている。この状態から、図２に示すように、ソケット１とプラグ２とを結合し、弁体４２に対して圧縮コイルばね４３のばね力に抗して流体通路３０の後端開口３０ａ側へ向けた力を加えると、弁体４２が押されてソケット本体１’の後端側に向けて後退移動してＯリング４４が弁座２４の弁座面２４ａから離れる。このため、弁体４２と弁座２４との間に隙間が形成されて流体通路３０が開放され流体の流通が可能となる。   1, when the socket 1 and the plug 2 are not coupled to each other, the valve body 42 pressed by the compression coil spring 43 comes into contact with the valve seat 24 via the O-ring 44 and is fluidized. The passage 30 is closed. From this state, as shown in FIG. 2, the socket 1 and the plug 2 are coupled, and the valve body 42 is directed toward the rear end opening 30 a of the fluid passage 30 against the spring force of the compression coil spring 43. When a force is applied, the valve body 42 is pushed and moved backward toward the rear end side of the socket body 1 ′ so that the O-ring 44 is separated from the valve seat surface 24 a of the valve seat 24. For this reason, a gap is formed between the valve body 42 and the valve seat 24, the fluid passage 30 is opened, and the fluid can flow.

なお、ソケット１にプラグ２を挿入して結合すると、ソケット本体１’の弁体４２の弁座部４２ａがプラグ本体２’の弁体１４２の弁座部１４２ａとそれぞれ前面突部４２ｃ，１４２ｃを介して当接し、各弁体４２，１４２がそれぞれ押されて流体通路３０，１３０を開放する。   When the plug 2 is inserted into the socket 1 and coupled, the valve seat 42a of the valve body 42 of the socket main body 1 ′ and the valve seat 142a of the valve body 142 of the plug main body 2 ′ are respectively connected to the front protrusions 42c and 142c. The valve bodies 42 and 142 are pushed respectively to open the fluid passages 30 and 130.

このように、ソケット本体１’において、圧縮コイルばね４３は、開閉弁４０の弁体４２に対して弁を閉めるように弁座２４側の向きに力を加えるとともに、弁体保持体４１に対して流体通路３０内で開閉弁受け部４９により保持固定するように後端側の向きに力を加えている。すなわち、本例のソケット１では、開閉弁４０を作動させるための圧縮コイルばね４３を開閉弁４０を保持するためにも利用することができる構造を実現する。   Thus, in the socket body 1 ′, the compression coil spring 43 applies a force in the direction toward the valve seat 24 so as to close the valve against the valve body 42 of the on-off valve 40, and against the valve body holding body 41. Thus, a force is applied in the direction toward the rear end so as to be held and fixed by the on-off valve receiver 49 in the fluid passage 30. That is, in the socket 1 of this example, a structure is realized in which the compression coil spring 43 for operating the on-off valve 40 can also be used to hold the on-off valve 40.

この場合、図示は省略するが、従来の管継手における継手本体のように開閉弁受け部が軸方向に離間した一対の側面（前側面および後側面）を有する環状溝を形成し、この一対の側面で脚部４１ａの先端部における前側面４１ｂおよび後側面４１ｃを挟んで保持する構造と比較して、本例のソケット本体１’では圧縮コイルばね４３が従来の継手本体の開閉弁受け部における前端面と同等の役割を担っている。   In this case, although not shown in the figure, like the joint body in the conventional pipe joint, the on-off valve receiver is formed with an annular groove having a pair of side surfaces (front side surface and rear side surface) separated in the axial direction. Compared to the structure in which the front side surface 41b and the rear side surface 41c at the front end portion of the leg portion 41a are sandwiched and held by the side surface, in the socket body 1 'of this example, the compression coil spring 43 is provided in the opening / closing valve receiving portion of the conventional joint body. It plays the same role as the front end face.

すなわち、本例のソケット本体１’では、開閉弁４０の開閉用の圧縮コイルばね４３を弁体保持体４１の保持固定にも利用することにより、開閉弁受け部４９において前端面を不要にした構造を実現することが可能となる。これにより、流体通路３０を後端開口３０ａから前端開口３０ｂへ向けて直径が直線的で連続的に拡大していくテーパ面を有するテーパ孔とすることが可能となる。説明を加える。前述した一対の側面を有する環状溝を用いて弁体保持体の脚部を保持固定する構造において、流体通路の内周面を後端開口から前端開口へ向けて直径が拡大するテーパ孔に形成することを考えると、流体通路の後端開口から環状溝の後側面までの間と、環状溝の前側面から流体通路の前端開口までの間にそれぞれテーパ面を形成することになる。そうすると、流体通路の内周面に形成されるテーパ面は、環状溝によって分断されて後部テーパ面と前部テーパ面が軸方向に位置をずらして並ぶ階段状に屈曲したものとなる。このため、流体通路に流体を流すと、流体は流体通路の後部と前部でそれぞれ軸方向に位置がずれたテーパ面に沿って流れ、両方のテーパ面に挟まれた環状溝の部分でテーパ面とは大きく向きが異なる通路軸方向に沿って流れるので、通路全体としては軸方向において階段状に屈曲した状態で流れる。これに対して本例では、開閉弁受け部４９でテーパ面を形成することにより、流体通路３０全体としてテーパ面が流体通路軸方向に位置をずらすように分断されて階段状に屈曲することがなく、流体が、流体通路３０の後端開口３０ａから前端開口３０ｂにかけて外側へ向けて直線的に連続して傾斜するテーパ面に沿って円滑に安定して流れる。これにより、ソケット本体１’の大型化を抑えつつ流体の安定した流れを確保したテーパ孔をなす流体通路３０を形成することができる。   That is, in the socket body 1 ′ of this example, the front end face is not required in the opening / closing valve receiving portion 49 by using the compression coil spring 43 for opening / closing the opening / closing valve 40 for holding and fixing the valve body holder 41. A structure can be realized. Thereby, the fluid passage 30 can be a tapered hole having a tapered surface whose diameter is linear and continuously expanding from the rear end opening 30a to the front end opening 30b. Add a description. In the structure for holding and fixing the leg portion of the valve body holder using the annular groove having a pair of side surfaces as described above, the inner peripheral surface of the fluid passage is formed as a tapered hole whose diameter increases from the rear end opening to the front end opening. In view of this, a tapered surface is formed between the rear end opening of the fluid passage and the rear side surface of the annular groove, and between the front side surface of the annular groove and the front end opening of the fluid passage. Then, the tapered surface formed on the inner peripheral surface of the fluid passage is divided by the annular groove, and is bent in a stepped manner in which the rear taper surface and the front taper surface are shifted in the axial direction. For this reason, when a fluid is caused to flow through the fluid passage, the fluid flows along the tapered surfaces that are axially displaced at the rear portion and the front portion of the fluid passage, respectively, and is tapered at the annular groove portion sandwiched between the two tapered surfaces. Since the flow flows along a passage axial direction that is largely different from the surface, the whole passage flows in a state of being bent stepwise in the axial direction. On the other hand, in this example, by forming a tapered surface at the on-off valve receiving portion 49, the tapered surface of the fluid passage 30 as a whole is divided so as to shift the position in the fluid passage axial direction and bent in a stepped manner. The fluid flows smoothly and stably along a tapered surface that linearly and continuously slopes outward from the rear end opening 30a to the front end opening 30b of the fluid passage 30. Thereby, it is possible to form the fluid passage 30 having a tapered hole that secures a stable flow of the fluid while suppressing an increase in size of the socket body 1 ′.

なお、ロック手段２１は、ソケット本体１’のプラグ挿入空間２２に挿入された後述するプラグ本体２’を挿入状態にてロックするもので、次のように構成されている。すなわち、前部筒体２０におけるプラグ挿入空間２２を囲む前端部の外周壁には、周方向に間隔をおいて複数の保持孔５０が外周壁の内側と外側とを貫通する状態で形成されており、これらの保持孔５０にはそれぞれロック用のボール５１が配置されている。   The locking means 21 locks a plug body 2 ', which will be described later, inserted into the plug insertion space 22 of the socket body 1' in the inserted state, and is configured as follows. That is, a plurality of holding holes 50 are formed in the outer peripheral wall of the front end portion surrounding the plug insertion space 22 in the front cylindrical body 20 so as to penetrate the inner side and the outer side of the outer peripheral wall at intervals in the circumferential direction. These holding holes 50 are each provided with a locking ball 51.

各保持孔５０は、外周壁のプラグ挿入空間２２側から径方向外側に向けて直径が拡大するテーパ孔をなすもので、プラグ挿入空間２２側開口の直径はボール５１の直径より小さく、外側開口の直径はボール５１の直径より大きく設定されており、各保持孔５０内にはボール５１が筒体の径方向に移動可能に保持されている。また、前部筒体２０におけるプラグ挿入空間２２を囲む外周壁の外側には、操作スリーブ５３が軸方向に移動可能に設けられている。この操作スリーブ５３は、図１に示すように、その内周面と前部筒体２０の外周壁との間に設けた圧縮コイルばね５４により常時前部筒体２０の前端側へ向けて押し付けられ、前部筒体２０の前端部の外周側に取り付けたストッパリング５５に当接した状態で固定されている。   Each holding hole 50 forms a tapered hole whose diameter increases from the outer peripheral wall toward the radially outer side from the plug insertion space 22 side. The diameter of the opening on the plug insertion space 22 side is smaller than the diameter of the ball 51, Is set larger than the diameter of the ball 51, and the ball 51 is held in each holding hole 50 so as to be movable in the radial direction of the cylindrical body. An operation sleeve 53 is provided on the outer side of the outer peripheral wall surrounding the plug insertion space 22 in the front cylindrical body 20 so as to be movable in the axial direction. As shown in FIG. 1, the operation sleeve 53 is constantly pressed toward the front end side of the front cylinder 20 by a compression coil spring 54 provided between the inner peripheral surface thereof and the outer peripheral wall of the front cylinder 20. The front cylindrical body 20 is fixed in contact with a stopper ring 55 attached to the outer peripheral side of the front end portion.

操作スリーブ５３の内周部には軸方向に向かって突出する内面突部５３ａが形成され、この内面突部５３ａは、操作スリーブ５３が前端側にあるときに前部筒体２０の各保持孔５０の外側開口を囲む位置にある。したがって、各保持孔５０に配置された各ボール５１は、ロック時に操作スリーブ５３の内面突部５３ａに外周壁の外側から押されて保持孔５０の内側開口から前部筒体２０のプラグ挿入空間２２内へ所定量が突出する。また、図示は省略するが、ロック解除時に操作スリーブ５３が前端側から後端側へ移動して内面突部５３ａが保持孔５０から外れた位置になると、各ボール５１は筒体の径方向に自由移動可能な状態となり、ロックが解除される。   An inner surface protrusion 53 a that protrudes in the axial direction is formed on the inner peripheral portion of the operation sleeve 53, and this inner surface protrusion 53 a is formed in each holding hole of the front cylindrical body 20 when the operation sleeve 53 is on the front end side. It is in a position surrounding 50 outer openings. Accordingly, each ball 51 arranged in each holding hole 50 is pushed from the outside of the outer peripheral wall to the inner surface protrusion 53a of the operation sleeve 53 when locked, and the plug insertion space of the front cylindrical body 20 from the inner opening of the holding hole 50 is locked. A predetermined amount projects into 22. Although not shown in the drawings, when the operation sleeve 53 moves from the front end side to the rear end side when the lock is released and the inner surface protrusion 53a comes out of the holding hole 50, each ball 51 moves in the radial direction of the cylinder. It becomes a state where it can move freely, and the lock is released.

そして、前部筒体２０のプラグ挿入空間２２の内周面には周方向に沿って環状溝５６が形成され、この環状溝５６にはＯリング５７が嵌め込まれている。このＯリング５７は、プラグ挿入空間２２に挿入されたプラグ本体２’の前部筒体１２０の前端部の外周面に接触し、プラグ挿入空間２２を外部と連通しないように封止する。   An annular groove 56 is formed along the circumferential direction on the inner peripheral surface of the plug insertion space 22 of the front cylinder 20, and an O-ring 57 is fitted in the annular groove 56. The O-ring 57 contacts the outer peripheral surface of the front end portion of the front cylindrical body 120 of the plug body 2 ′ inserted into the plug insertion space 22 and seals the plug insertion space 22 so as not to communicate with the outside.

接続手段１１は、接続孔１３に挿入されて後部筒体１０の後端部に接続される外部の配管（ホースやパイプなど）９０１を後部筒体１０に対して固定するもので、後部筒体１０の後端部の外周面に締付けナット１１ａが螺合され、この締付けナット１１ａの内側に締付けリング１１ｂが設けられた状態で構成されている。この締付けリング１１ｂは、例えばコレットチャック形式をなすもので、締付けナット１１ａを締付け方向へ回転させると、締付けナット１１ａと後部筒体１０の後端面１０ｂとに挟まれて直径が縮小する構造を備えている。すなわち、外部の配管９０１を後部筒体１０の接続孔１３に挿入し、締付けナット１１ａを締付け方向へ回転させて締付けリング１１ｂを縮径させることにより、外部の配管９０１を締付けてソケット本体１’に接続固定する。   The connecting means 11 fixes an external pipe (such as a hose or pipe) 901 inserted into the connecting hole 13 and connected to the rear end of the rear cylinder 10 to the rear cylinder 10. The fastening nut 11a is screwed onto the outer peripheral surface of the rear end portion of the belt 10, and the fastening ring 11b is provided inside the fastening nut 11a. The tightening ring 11b has, for example, a collet chuck type, and has a structure in which the diameter is reduced by being sandwiched between the tightening nut 11a and the rear end surface 10b of the rear cylindrical body 10 when the tightening nut 11a is rotated in the tightening direction. ing. That is, the external pipe 901 is inserted into the connection hole 13 of the rear cylinder 10 and the tightening nut 11a is rotated in the tightening direction to reduce the diameter of the tightening ring 11b, thereby tightening the external pipe 901 and tightening the socket body 1 ′. Fix the connection to.

このように構成されたソケット本体１’では、流体は、例えば外部の配管９０１から後部筒体１０の第１通路１２に流れ、さらに弁体保持体４１の各脚部４１ａの間隙を通って前部筒体２０の第２通路２９を流れて弁座２４に到達する。すなわち、流体は、ソケット本体１’の流体通路３０にその後端開口３０ａから入り、流体通路３０の内部をテーパ状の内周面に沿って前端開口３０ｂへと流れる。なお、流体の流通方向が異なれば、流体通路３０の前端開口３０ｂから後端開口３０ａに向かって流れることとなる。   In the socket main body 1 ′ configured in this way, the fluid flows, for example, from the external pipe 901 to the first passage 12 of the rear cylinder 10, and further passes through the gaps between the leg portions 41 a of the valve body holder 41. The second cylinder 29 flows through the second passage 29 and reaches the valve seat 24. That is, the fluid enters the fluid passage 30 of the socket main body 1 ′ from the rear end opening 30 a and flows inside the fluid passage 30 along the tapered inner peripheral surface to the front end opening 30 b. If the flow direction of the fluid is different, the fluid passage 30 flows from the front end opening 30b toward the rear end opening 30a.

このように、本例では、図３にも示すようにソケット本体１’の流体通路３０の内周面を、この流体通路３０の後端開口３０ａから前端開口３０ｂにかけて直径が直線的で連続的に拡大するテーパ面を有するテーパ孔としているため、通路の面積が後端開口３０ａから前端開口３０ｂにかけて連続的に拡大し、従来のようなストレート孔とした場合と比較してその断面積が大きくなる。このため、流体通路３０を流れる流体の流量を全体的に増加させることが可能となる。また、ソケット本体１’を、従来のようなストレート孔とした場合と比較して、後部筒体１０や前部筒体２０における流体通路３０を囲む部分の外形寸法の大型化を抑えることが可能となる。   Thus, in this example, as shown also in FIG. 3, the diameter of the inner peripheral surface of the fluid passage 30 of the socket body 1 ′ is linear and continuous from the rear end opening 30a to the front end opening 30b of the fluid passage 30. Since the taper hole has a taper surface that expands to the front end, the area of the passage continuously increases from the rear end opening 30a to the front end opening 30b, and its cross-sectional area is larger than that of a conventional straight hole. Become. For this reason, the flow rate of the fluid flowing through the fluid passage 30 can be increased as a whole. Further, it is possible to suppress an increase in the outer dimensions of the portion surrounding the fluid passage 30 in the rear cylinder 10 or the front cylinder 20 as compared with the case where the socket body 1 ′ is a straight hole as in the past. It becomes.

そして、流体通路３０を流れる流体は、後端開口３０ａから前端開口３０ｂにかけてテーパ面をなす内周面に沿って連続して広がり（あるいは狭まり）ながら安定して円滑に流れることとなる。すなわち、流体通路３０を通流する流体の流れは、連続して広がり（あるいは狭まり）つつ途中で流れの向きを変えたり途切れたりすることはないため、流路抵抗による流量の損失の発生度合いを極力低くすることが可能となる。特に流体通路３０における前端開口３０ｂの近傍においては、開閉弁４０が設けられているために流体に対する抵抗が増加するのが一般的であり、本例のソケット本体１’のように流体通路３０の断面積が拡大する構造を採用することで流体の流れを安定して円滑にすることが可能となる。   Then, the fluid flowing through the fluid passage 30 flows stably and smoothly while continuously expanding (or narrowing) along the inner peripheral surface forming a tapered surface from the rear end opening 30a to the front end opening 30b. That is, the flow of the fluid flowing through the fluid passage 30 continuously expands (or narrows), but does not change the direction of the flow or be interrupted. It becomes possible to make it as low as possible. In particular, in the vicinity of the front end opening 30b in the fluid passage 30, since the on-off valve 40 is provided, the resistance to the fluid generally increases. As in the socket body 1 'of this example, the fluid passage 30 By adopting a structure with an enlarged cross-sectional area, the fluid flow can be made stable and smooth.

また、本実施形態では、ソケット本体１’の前部筒体２０の結合孔２３は、開閉弁４０の弁体保持体４１の外径に対応した直径を有しており、この弁体保持体４１を脚部４１ａの先端部をソケット本体１’の開閉弁受け部４９に係合することにより保持している。すなわち、前部筒体２０の結合孔２３の内周面と、この結合孔２３の内側に挿入して螺合する後部筒体１０の前端部の外周面とは、前部筒体２０の後端開口から前部筒体２０の第２通路２９の内周面（テーパ面）と交差する点Ｂまでの間が軸方向に沿った平行な面をなしている。そして、前部筒体２０の結合孔２３の内周面においては、後部筒体１０の前端部の外周面との間のシールを図るためのＯリング２７がリング受け部２６に嵌め込まれている。   Moreover, in this embodiment, the coupling hole 23 of the front cylinder 20 of the socket body 1 ′ has a diameter corresponding to the outer diameter of the valve body holder 41 of the on-off valve 40, and this valve body holder 41 is held by engaging the front end of the leg 41a with the on-off valve receiver 49 of the socket body 1 '. That is, the inner peripheral surface of the coupling hole 23 of the front cylindrical body 20 and the outer peripheral surface of the front end portion of the rear cylindrical body 10 that is inserted into the coupling hole 23 and screwed together are the rear of the front cylindrical body 20. A portion extending from the end opening to the point B intersecting the inner peripheral surface (tapered surface) of the second passage 29 of the front cylindrical body 20 forms a parallel surface along the axial direction. An O-ring 27 for fitting a seal with the outer peripheral surface of the front end portion of the rear cylindrical body 10 is fitted into the ring receiving portion 26 on the inner peripheral surface of the coupling hole 23 of the front cylindrical body 20. .

このように構成されたソケット本体１’を組み立てる場合は、まず、弁体保持体４１と、弁体４２と、圧縮コイルばね４３とを組み合わせて開閉弁４０を組み立てた後、この開閉弁４０を前部筒体２０の後端開口から結合孔２３を通して弁座２４および第１通路２９内に組み込む。次いで、前部筒体２０の結合孔２３の内側にＯリング２７を挿入して、このＯリング２７を結合孔２３の内周面に形成したリング受け部２６に嵌め込む。   When assembling the socket body 1 ′ configured in this way, first, the valve body holding body 41, the valve body 42, and the compression coil spring 43 are assembled to assemble the on-off valve 40, and then the on-off valve 40 is It is incorporated into the valve seat 24 and the first passage 29 through the coupling hole 23 from the rear end opening of the front cylinder 20. Next, an O-ring 27 is inserted inside the coupling hole 23 of the front cylinder 20, and the O-ring 27 is fitted into a ring receiving portion 26 formed on the inner peripheral surface of the coupling hole 23.

ここで、このときは、開閉弁４０の弁体保持体４１が圧縮コイルばね４３により押されて前部筒体２０の後端開口側へ移動された状態となり、弁体保持体４１の各脚部４１ａが、結合孔２３におけるＯリング２７の嵌め込み位置であるリング受け部２６を軸方向に後端開口側へ越えた位置にくることとなる（図４の仮想線参照）。この状態のままではＯリング２７を前部筒体２０の後端開口から結合孔２３の内側に挿入しても、Ｏリング２７が各脚部４１ａに当接してリング受け部２６まで移動させることができない状態となってしまう。   Here, at this time, the valve body holding body 41 of the on-off valve 40 is pushed by the compression coil spring 43 and moved to the rear end opening side of the front cylinder 20, and each leg of the valve body holding body 41 is moved. The portion 41a comes to a position beyond the ring receiving portion 26 that is the fitting position of the O-ring 27 in the coupling hole 23 in the axial direction toward the rear end opening side (see the phantom line in FIG. 4). In this state, even if the O-ring 27 is inserted from the rear end opening of the front cylinder 20 into the coupling hole 23, the O-ring 27 contacts the leg portions 41a and moves to the ring receiving portion 26. It will be in a state that can not be.

図４は、本実施形態に係る管継手におけるソケットの組立時の様子を一部を断面で示す側面図である。本例のソケット１を組み立てる際には、図４に示すように、例えば専用の組立治具９１０を用いて弁体保持体４１を圧縮コイルばね４３の弾性力に抗して前部筒体２０の前端開口側へ向けて図中矢印で示す方向に押し込み、各脚部４１ａをリング受け部２６よりも前部筒体２０の前端開口側へ軸方向に寄った位置まで移動させた状態で保持する。その上で、Ｏリング２７を前部筒体２０の後端開口から結合孔２３の内側に挿入してリング受け部２６まで移動させて嵌め込む。   FIG. 4 is a side view showing a part in cross-section of the socket in the pipe joint according to the present embodiment during assembly. When assembling the socket 1 of this example, as shown in FIG. 4, for example, using a dedicated assembly jig 910, the valve body holder 41 is resisted against the elastic force of the compression coil spring 43. Is pushed in the direction indicated by the arrow in the figure toward the front end opening side, and each leg portion 41a is held in a state of being moved to a position closer to the front end opening side of the front cylindrical body 20 than the ring receiving portion 26 to the axial direction. To do. Then, the O-ring 27 is inserted into the inside of the coupling hole 23 from the rear end opening of the front cylindrical body 20 and moved to the ring receiving portion 26 to be fitted.

その後、組立治具９１０で弁体保持体４１を押さえた状態のまま後部筒体１０の前端部を図中矢印で示す方向に移動させ前部筒体２０の結合孔２３の内側に挿入して螺合する。こうして後部筒体１０を前部筒体２０の結合孔２３に完全に螺合した後、組立治具９１０を接続孔１３を通して引き抜き、ソケット１の組立作業を終了する。   Thereafter, the front end portion of the rear cylinder 10 is moved in the direction indicated by the arrow in the drawing while the valve body holder 41 is held by the assembly jig 910 and inserted into the coupling hole 23 of the front cylinder 20. Screw together. Thus, after the rear cylinder 10 is completely screwed into the coupling hole 23 of the front cylinder 20, the assembly jig 910 is pulled out through the connection hole 13, and the assembly operation of the socket 1 is completed.

この組立方法に用いる組立治具９１０は、例えば前部筒体２０の結合孔２３の内側に挿入可能となるような棒状をなし、先端部に弁体保持体４１に対して外側から係合できるような形状の凹部が形成されたものが好適である。組立治具９１０は、例えば図示しないピストン−シリンダ装置に装備され、前部筒体２０の結合孔２３の内側において軸方向に出入可能に移動させることで使用される。   The assembling jig 910 used in this assembling method has a rod shape that can be inserted into the inside of the coupling hole 23 of the front cylindrical body 20, for example, and can be engaged with the valve body holding body 41 from the outside at the tip portion. What formed the recessed part of such a shape is suitable. The assembly jig 910 is mounted on, for example, a piston-cylinder device (not shown), and is used by moving the assembly jig 910 so as to be able to enter and exit in the axial direction inside the coupling hole 23 of the front cylindrical body 20.

このような組立方法によれば、前部筒体２０の内部に開閉弁４０を組み込んだ後にＯリング２７を結合孔２３の内側に嵌め込むことができる。このため、開閉弁４０を組み込む際に開閉弁４０の弁体保持体４１がＯリング２７に接触したりしてこれを傷付けてしまうなどの不具合を回避することが可能となる。前部筒体２０の結合孔２３は、上述したように全体が開閉弁４０の弁体保持体４１の外径に対応した直径（内径）を有し、前部筒体２０の結合孔２３の内周面と後部筒体１０の前端部の外周面とがそれぞれ軸方向に沿った直線をなすように形成されている。   According to such an assembling method, the O-ring 27 can be fitted inside the coupling hole 23 after the on-off valve 40 is incorporated into the front cylindrical body 20. For this reason, when incorporating the on-off valve 40, it becomes possible to avoid problems such as the valve body holder 41 of the on-off valve 40 coming into contact with the O-ring 27 and damaging it. The coupling hole 23 of the front cylindrical body 20 has a diameter (inner diameter) corresponding to the outer diameter of the valve body holding body 41 of the on-off valve 40 as described above. The inner peripheral surface and the outer peripheral surface of the front end portion of the rear cylindrical body 10 are formed so as to form a straight line along the axial direction.

このため、開閉弁４０より先にＯリング２７を結合孔２３の内側に挿入した状態で、この結合孔２３に開閉弁４０を組み込むと、開閉弁４０の弁体保持体４１の各脚部４１ａの先端部における先端面が結合孔２３の内周面とほぼ接触する状態に形成されているため、この先端面が結合孔２３の内側に挿入したＯリング２７と接触してこれを損傷させてしまうこととなる。そこで、上述したような組立方法を採用することにより、開閉弁４０を前部筒体２０内に組み込む際のＯリング２７の損傷などを確実に回避することが可能となる。なお、後部筒体１０の前端部を前部筒体２０の結合孔２３に螺合挿入する場合には、後部筒体１０が第１および第２のねじ部１５，２５に沿って回転しながら少しずつ軸方向に進んでＯリング２７を無理なく押すために、弁体保持体４１の各脚部４１ａがＯリング２７を引っかけて軸方向に移動する場合のようにＯリング２７を損傷することがない。   For this reason, when the opening / closing valve 40 is assembled in the coupling hole 23 with the O-ring 27 inserted inside the coupling hole 23 prior to the opening / closing valve 40, each leg 41 a of the valve body holder 41 of the opening / closing valve 40. Since the tip surface at the tip of the contact hole is substantially in contact with the inner peripheral surface of the coupling hole 23, the tip surface comes into contact with the O-ring 27 inserted inside the coupling hole 23 to damage it. Will end up. Therefore, by adopting the assembly method as described above, it is possible to reliably avoid damage to the O-ring 27 when the on-off valve 40 is incorporated into the front cylinder 20. When the front end of the rear cylinder 10 is screwed into the coupling hole 23 of the front cylinder 20, the rear cylinder 10 is rotated along the first and second screw parts 15 and 25. In order to gradually advance in the axial direction and push the O-ring 27 effortlessly, each leg 41a of the valve body holder 41 may damage the O-ring 27 as in the case of moving in the axial direction by hooking the O-ring 27. There is no.

次に、本実施形態において、上述したような前部筒体２０の結合孔２３および後部筒体１０の構造を採用する理由について述べる。まず、ソケット本体１’における前部筒体２０の外径は小型化を図る上で最小とする必要がある。一方、前部筒体２０において結合孔２３を構成する周壁の厚さ、すなわち結合孔２３の内周面と結合孔２３を囲む周壁の外周面との間の厚さは、前部筒体２０の強度を維持する上で所定の厚さが必要である。このような相反した要求を満たすためには、前部筒体２０の結合孔２３は全体が開閉弁４０の弁体保持体４１の外径に応じた直径とし、結合孔２３の内周面および後部筒体１０の前端部の外周面をそれぞれ軸方向に沿った平行な面に形成するのが適切であるからである。   Next, the reason why the structure of the coupling hole 23 of the front cylinder 20 and the rear cylinder 10 as described above is employed in the present embodiment will be described. First, it is necessary to minimize the outer diameter of the front cylindrical body 20 in the socket body 1 'in order to reduce the size. On the other hand, the thickness of the peripheral wall constituting the coupling hole 23 in the front cylindrical body 20, that is, the thickness between the inner peripheral surface of the coupling hole 23 and the outer peripheral surface of the peripheral wall surrounding the coupling hole 23 is the front cylindrical body 20. In order to maintain the strength, a predetermined thickness is required. In order to satisfy such conflicting requirements, the entire coupling hole 23 of the front cylinder 20 has a diameter corresponding to the outer diameter of the valve body holding body 41 of the on-off valve 40, and the inner peripheral surface of the coupling hole 23 and This is because it is appropriate to form the outer peripheral surface of the front end portion of the rear cylinder 10 in parallel planes along the axial direction.

また、前部筒体２０の結合孔２３に開閉弁４０を組み込む場合に、結合孔２３の内側に挿入したＯリング２７の接触損傷を回避するためには、次に述べる構成が考えられる。すなわち、結合孔２３の前部の直径を通常の大きさ（開閉弁４０の弁体保持体４１の各脚部４１ａの先端外径と対応する大きさ）とし、結合孔２３の後部の直径をこれよりも大きくして内周面を段付きの構成とする。   In order to avoid contact damage to the O-ring 27 inserted inside the coupling hole 23 when the on-off valve 40 is incorporated in the coupling hole 23 of the front cylinder 20, the following configuration can be considered. That is, the diameter of the front portion of the coupling hole 23 is set to a normal size (the size corresponding to the outer diameter of the tip of each leg portion 41a of the valve body holding body 41 of the on-off valve 40), and the diameter of the rear portion of the coupling hole 23 is set. The inner peripheral surface is configured to be stepped by making it larger than this.

後部筒体１０の前端部についても結合孔２３の形状に応じて、前部の外径を結合孔２３の前部の直径に対応した通常の大きさとするとともに、後部の外径を結合孔２３の後部の直径に応じた大きさにして段付き構成とする。そして、前部筒体２０の結合孔２３の後部の内周面にＯリング２７を嵌め込み、このＯリング２７を結合孔２３に挿入する後部筒体１０の前端部の後部の外周面に接触させる。   Regarding the front end portion of the rear cylinder 10, the outer diameter of the front portion is set to a normal size corresponding to the diameter of the front portion of the coupling hole 23 according to the shape of the coupling hole 23, and the outer diameter of the rear portion is set to the coupling hole 23. A stepped configuration is made according to the diameter of the rear part. Then, an O-ring 27 is fitted into the inner peripheral surface of the rear portion of the coupling hole 23 of the front cylindrical body 20, and this O-ring 27 is brought into contact with the outer peripheral surface of the rear portion of the front end portion of the rear cylindrical body 10 inserted into the coupling hole 23. .

この構成によれば、前部筒体２０の結合孔２３に嵌め込むＯリング２７の位置を弁体保持体４１の各脚部４１ａの先端から外周側に離れた位置に設定することができる。このため、開閉弁４０を前部筒体２０に組み込む場合に弁体保持体４１の各脚部４１ａの先端が結合孔２３内に設けたＯリング２７に接触してこれを破損させてしまうことを回避することができる。   According to this configuration, the position of the O-ring 27 fitted into the coupling hole 23 of the front cylindrical body 20 can be set to a position away from the distal end of each leg portion 41a of the valve body holding body 41 toward the outer peripheral side. For this reason, when incorporating the opening / closing valve 40 into the front cylinder 20, the tips of the leg portions 41 a of the valve body holder 41 come into contact with the O-ring 27 provided in the coupling hole 23 and damage it. Can be avoided.

しかしながら、このような構造においても、前部筒体２０の結合孔２３における大径部を囲む周壁の厚さを前部筒体２０としての強度を維持する上で必要な厚さにすると、この大径部を囲む周壁の外径が結合孔２３の小径部を囲む周壁の外径に比較して、結合孔２３の直径が大きい分だけ拡大して前部筒体２０が大型化してしまうこととなり、小型化の要求には応えられないこととなる。そこで、上述したように結合孔２３の全体が開閉弁４０の弁体保持体４１の外径に応じた直径とし、結合孔２３の内周面および後部筒体１０の前端部の外周面をそれぞれ軸方向に沿った平行な面となるように構成した。   However, even in such a structure, if the thickness of the peripheral wall surrounding the large diameter portion in the coupling hole 23 of the front cylindrical body 20 is set to a thickness necessary for maintaining the strength as the front cylindrical body 20, The outer diameter of the peripheral wall surrounding the large-diameter portion is larger than the outer diameter of the peripheral wall surrounding the small-diameter portion of the coupling hole 23, and the front cylindrical body 20 is enlarged by increasing the diameter of the coupling hole 23. Therefore, the demand for miniaturization cannot be met. Therefore, as described above, the entire coupling hole 23 has a diameter corresponding to the outer diameter of the valve body holding body 41 of the on-off valve 40, and the inner circumferential surface of the coupling hole 23 and the outer circumferential surface of the front end portion of the rear cylinder 10 are respectively provided. It comprised so that it might become a parallel surface along an axial direction.

次に、プラグ２について説明する。なお、以降においては、既に説明した部分と重複する箇所については説明を割愛する。プラグ２は、図１および図２に示すように、例えば後部筒体１１０と前部筒体１２０とを結合して構成され、両端を開放した筒体をなすとともに内部に流体通路１３０を有するプラグ本体２’と、このプラグ本体２’の流体通路１３０に設けられた開閉弁１４０と、後部筒体１１０の内部に挿入される配管（管路）９０２を接続する接続手段（配管接続部）１１１とを備えて構成される。   Next, the plug 2 will be described. In the following, description of portions that overlap with the already described portions is omitted. As shown in FIGS. 1 and 2, the plug 2 is configured by, for example, connecting a rear cylinder 110 and a front cylinder 120, forming a cylinder whose both ends are open, and having a fluid passage 130 inside. Connection means (pipe connection portion) 111 for connecting the main body 2 ′, the on-off valve 140 provided in the fluid passage 130 of the plug main body 2 ′, and a pipe (pipe) 902 inserted into the rear cylinder 110. And is configured.

このプラグ本体２’は、上述したソケット本体１’と比較すると、プラグ挿入空間２２およびロック手段２１を備えない以外は、ソケット本体１’と基本的に同様の構成を有している。また、プラグ本体２’における開閉弁１４０および接続手段１１１も、ソケット本体１’における開閉弁４０および接続手段１１と同様の構成となっている。このため、プラグ本体２’については、これら各構成部に符号を付して詳細な説明は省略する。   Compared with the socket body 1 ′ described above, the plug body 2 ′ has basically the same configuration as the socket body 1 ′ except that the plug insertion space 22 and the lock means 21 are not provided. Further, the on-off valve 140 and the connecting means 111 in the plug main body 2 ′ have the same configuration as the on-off valve 40 and the connecting means 11 in the socket main body 1 ′. For this reason, the plug main body 2 ′ is provided with a reference numeral for these components and will not be described in detail.

まず、後部筒体１１０の各構成部は次の通りである。図中１１０ａは後部筒体１１０の前端面、１１２は後部筒体１１０の第１通路、１１３は後部筒体１１０に形成された接続孔、１１４は後部筒体１１０の中間ナット、１１５は後部筒体１１０前端部の外周面におけるねじ部、１１６は後部筒体１１０の後端部の外周面におけるねじ部である。また、１１１ａは配管９０２を接続固定する接続手段１１１を構成する締付けナット、１１１ｂは締付けリングである。   First, each component of the rear cylinder 110 is as follows. In the figure, 110a is a front end surface of the rear cylinder 110, 112 is a first passage of the rear cylinder 110, 113 is a connection hole formed in the rear cylinder 110, 114 is an intermediate nut of the rear cylinder 110, and 115 is a rear cylinder. A threaded portion 116 on the outer peripheral surface of the front end portion of the body 110 and a threaded portion 116 on the outer peripheral surface of the rear end portion of the rear cylinder 110 are shown. 111a is a tightening nut constituting the connecting means 111 for connecting and fixing the pipe 902, and 111b is a tightening ring.

次に、前部筒体１２０の各構成部は次の通りである。１２９は前部筒体１２０に形成された第２通路、１２３は前部筒体１２０の結合孔、１２３ａは結合孔１２３の内周面における開閉弁受け部１４９を構成する面、１２４は前部筒体１２０の弁座、１２５は結合孔１２３のねじ部、１２６は前部筒体１２０のリング受け部、１２７はリング受け部１２６に嵌め込まれるＯリング、１２８はロックボルトである。また、１８８は前部筒体１２０の外周部に形成した環状のロック溝である。このロック溝１８８は、プラグ本体２’におけるロック手段２１に対応した相手部材であるソケット１との接続をロックする結合部を構成し、プラグ本体２’をソケット本体１’のプラグ挿入空間２２に完全挿入しロック手段２１をロック状態にした場合に、ロック手段２１のボール５１が係合する。   Next, each component of the front cylinder 120 is as follows. 129 is a second passage formed in the front cylindrical body 120, 123 is a coupling hole of the front cylindrical body 120, 123a is a surface constituting the on-off valve receiving portion 149 on the inner peripheral surface of the coupling hole 123, and 124 is a front portion The valve seat of the cylinder 120, 125 is a screw part of the coupling hole 123, 126 is a ring receiving part of the front cylinder 120, 127 is an O-ring fitted into the ring receiving part 126, and 128 is a lock bolt. Reference numeral 188 denotes an annular lock groove formed on the outer peripheral portion of the front cylindrical body 120. The lock groove 188 constitutes a coupling portion for locking the connection with the socket 1 which is a mating member corresponding to the locking means 21 in the plug body 2 ′, and the plug body 2 ′ is inserted into the plug insertion space 22 of the socket body 1 ′. When the lock means 21 is completely inserted and the lock means 21 is locked, the balls 51 of the lock means 21 are engaged.

また、開閉弁１４０の各構成部は次の通りである。１４１は弁体保持体、１４２は弁体、１４３は圧縮コイルばね（弾性部材）である。弁体保持体１４１は、複数の脚部１４１ａを有し、１４１ｂは脚部１４１ａの前側面、１４１ｃは脚部１４１ａの後側面、１４１ｄは脚部１４１ａの先端面、１４１ｆは弁体保持体１４１の連通孔である。弁体１４２は、弁体部１４２ａを有し、１４２ｂは筒部である。１４４は弁体部１４２ａに設けられているＯリングである。このように構成されたプラグ本体２’は、図１に示すように、ソケット本体１’と接続されていない場合は、開閉弁１４０が流体通路１３０を閉じた状態となる。   Each component of the on-off valve 140 is as follows. 141 is a valve body holder, 142 is a valve body, and 143 is a compression coil spring (elastic member). The valve body holding body 141 has a plurality of leg portions 141a, 141b is a front side surface of the leg portion 141a, 141c is a rear side surface of the leg portion 141a, 141d is a front end surface of the leg portion 141a, and 141f is a valve body holding body 141. This is a communication hole. The valve body 142 has a valve body portion 142a, and 142b is a cylinder portion. 144 is an O-ring provided in the valve body 142a. As shown in FIG. 1, the plug body 2 ′ configured as described above is in a state where the on-off valve 140 closes the fluid passage 130 when not connected to the socket body 1 ′.

このプラグ本体２’においては、後部筒体１１０の第１通路１１２と前部筒体１２０の第２通路１２９とが組み合わさって、プラグ本体２’の内部に流体通路１３０を形成している。この流体通路１３０は、ソケット本体１’の流体通路３０と同様に内周面が後端開口１３０ａから前端開口１３０ｂにかけて外側へ向けて直線的で連続的に傾斜するテーパ面を有するテーパ孔である。   In the plug body 2 ′, the fluid passage 130 is formed in the plug body 2 ′ by combining the first passage 112 of the rear cylinder 110 and the second passage 129 of the front cylinder 120. The fluid passage 130 is a tapered hole having a tapered surface whose inner peripheral surface is linearly and continuously inclined outward from the rear end opening 130a to the front end opening 130b, like the fluid passage 30 of the socket body 1 ′. .

また、後部筒体１１０の第１通路１１２と前部筒体１２０の第２通路１２９との境界部には、後部筒体１１０の前端面１１０ａと前部筒体１２０の結合孔１２３の内周面における面１２３ａとの組み合わせにより開閉弁１４０を受ける開閉弁受け部１４９が形成され、この開閉弁受け部１４９によって弁体保持体１４１の各脚部１４１ａを保持している。さらに、前部筒体１２０の結合孔１２３は軸方向にわたって全体が一定の直径を有し、この結合孔１２３に挿入される後部筒体１１０の前端部の外周面も軸方向にわたって全体が一定の直径を有しており、結合孔１２３の内周面のリング受け部１２６には、後部筒体１１０の前端部の外周面と接触するＯリング１２７が嵌め込まれている。したがって、このプラグ本体２’においても上述したソケット本体１’と同様な作用および効果を実現することができる。   Further, at the boundary between the first passage 112 of the rear cylinder 110 and the second passage 129 of the front cylinder 120, the inner periphery of the front end surface 110 a of the rear cylinder 110 and the coupling hole 123 of the front cylinder 120 is provided. An opening / closing valve receiving portion 149 that receives the opening / closing valve 140 is formed by a combination with the surface 123 a on the surface, and each leg portion 141 a of the valve body holder 141 is held by the opening / closing valve receiving portion 149. Further, the coupling hole 123 of the front cylinder 120 has a constant diameter throughout the axial direction, and the outer peripheral surface of the front end portion of the rear cylinder 110 inserted into the coupling hole 123 is also constant throughout the axial direction. An O-ring 127 that has a diameter and is in contact with the outer peripheral surface of the front end portion of the rear cylinder 110 is fitted in the ring receiving portion 126 on the inner peripheral surface of the coupling hole 123. Accordingly, the plug body 2 'can also achieve the same operations and effects as the socket body 1' described above.

このように構成されたソケット１およびプラグ２を互いに結合する場合には、図２に示すように、プラグ本体２’の前部筒体１２０をソケット本体１’の前部筒体２０のプラグ挿入空間２２に挿入し、ソケット本体１’に設けたロック手段２１によりプラグ本体２’をソケット本体１’に結合固定する。すなわち、ロック手段２１の操作スリーブ５３を圧縮コイルばね５４に抗してソケット本体１’の軸方向後方に移動させ、ボール５１を自由移動可能な状態にしてプラグ本体２’をソケット本体１’のプラグ挿入空間２２に挿入する。   When the socket 1 and the plug 2 configured as described above are coupled to each other, as shown in FIG. 2, the front cylinder 120 of the plug body 2 ′ is inserted into the plug of the front cylinder 20 of the socket body 1 ′. The plug body 2 ′ is inserted into the space 22 and fixedly coupled to the socket body 1 ′ by the locking means 21 provided on the socket body 1 ′. That is, the operation sleeve 53 of the lock means 21 is moved against the compression coil spring 54 in the axial direction rearward direction of the socket body 1 ′ so that the ball 51 can be freely moved and the plug body 2 ′ is moved to the socket body 1 ′. Insert into the plug insertion space 22.

次いで、操作スリーブ５３を圧縮コイルばね５４の弾性力により軸方向前方に移動させて、ボール５１をプラグ本体２’のロック溝１８８に係合させてソケット本体１’とプラグ本体２’との接続状態をロックする。この場合、プラグ本体２’に設けた開閉弁１４０の弁体１４２と、ソケット本体１’に設けた開閉弁４０の弁体４２とが、互いの前面突部４２ｃ，１４２ｃが接触することにより当接し、それぞれの圧縮コイルばね４３，１４３の力に抗して押し合いながら各々軸方向後方に移動して弁座２４，１２４から離間する。これにより、ソケット本体１’の流体通路３０とプラグ本体２’の流体通路１３０がそれぞれ開放されて連通する。流体は、配管９０１、流体通路３０および流体通路１３０を通って配管９０２側に向かって、または配管９０２、流体通路１３０および流体通路３０を通って配管９０１側に向かって流れることが可能となる。   Next, the operation sleeve 53 is moved forward in the axial direction by the elastic force of the compression coil spring 54, and the ball 51 is engaged with the lock groove 188 of the plug body 2 'to connect the socket body 1' and the plug body 2 '. Lock state. In this case, the valve body 142 of the on-off valve 140 provided on the plug main body 2 ′ and the valve body 42 of the on-off valve 40 provided on the socket main body 1 ′ are brought into contact with each other by the front projections 42c and 142c. They are in contact with each other and are moved rearward in the axial direction while pressing against the force of the respective compression coil springs 43 and 143 to be separated from the valve seats 24 and 124. Thereby, the fluid passage 30 of the socket body 1 ′ and the fluid passage 130 of the plug body 2 ′ are opened and communicated. The fluid can flow through the pipe 901, the fluid passage 30 and the fluid passage 130 toward the pipe 902 side, or through the pipe 902, the fluid passage 130 and the fluid passage 30 toward the pipe 901 side.

本実施形態においては、上述したようにソケット本体１’およびプラグ本体２’ともに、後部筒体１０，１１０の第１通路１２，１１２の内周面は、接続孔１３，１１３の前端から後部筒体１０，１１０の前端開口に向けて直径が直線的で連続的に拡大するテーパ面を有する。また、前部筒体２０，１２０の第２通路２９，１２９の内周面は、結合孔２３，１２３の前端から弁座２４，１２４の後端に向けて直径が直線的で連続的に拡大し、後部筒体１０，１１０の第１通路１２，１１２の内周面の傾斜角度より大きい、または同じ傾斜角度で形成されたテーパ面を有する構成を採用している。   In the present embodiment, as described above, the inner peripheral surfaces of the first passages 12 and 112 of the rear cylinders 10 and 110 are connected to the rear cylinder from the front ends of the connection holes 13 and 113 in both the socket main body 1 ′ and the plug main body 2 ′. It has a taper surface whose diameter is linear and continuously expanding toward the front end opening of the body 10,110. In addition, the inner peripheral surfaces of the second passages 29 and 129 of the front cylinders 20 and 120 are linear in diameter and continuously expand from the front ends of the coupling holes 23 and 123 toward the rear ends of the valve seats 24 and 124. And the structure which has a taper surface larger than the inclination angle of the internal peripheral surface of the 1st channel | paths 12 and 112 of the rear cylinders 10 and 110 or formed with the same inclination angle is employ | adopted.

前部筒体２０，１２０の第２通路２９，１２９の傾斜角度が後部筒体１０，１１０の第１通路１２，１１２と比較して大きい場合には前端開口３０ｂ，１３０ｂの開口面積が大きくなる。このため、開閉弁４０，１４０が配置されるために流体通路３０，１３０を流通する流体に対する流路抵抗が大きくなる前端開口３０ｂ，１３０ｂにおいて、流体の流量を増加させることが可能となる。   When the inclination angle of the second passages 29 and 129 of the front cylinders 20 and 120 is larger than that of the first passages 12 and 112 of the rear cylinders 10 and 110, the opening areas of the front end openings 30b and 130b are increased. . For this reason, since the on-off valves 40 and 140 are arranged, the flow rate of the fluid can be increased in the front end openings 30b and 130b where the flow resistance against the fluid flowing through the fluid passages 30 and 130 increases.

第１通路１２，１１２の内周面の傾斜角度が第２通路２９，１２９の内周面の傾斜角度と同じ大きさである場合は、上述したように流体通路３０，１３０全体の内周面が同一直線上に配置される構成を実現することができるので、流体をより一層安定して円滑に流すことが可能となる。第２通路２９，１２９の内周面の傾斜角度を第１通路１２，１１２の内周面の傾斜角度よりも大きくした場合であっても、ストレート孔と比較して流量を増加させて円滑に流すことが可能となる。   When the inclination angle of the inner peripheral surface of the first passages 12 and 112 is the same as the inclination angle of the inner peripheral surface of the second passages 29 and 129, as described above, the inner peripheral surface of the fluid passages 30 and 130 as a whole. Can be realized so that the fluid can flow more stably and smoothly. Even when the inclination angle of the inner peripheral surface of the second passages 29 and 129 is larger than the inclination angle of the inner peripheral surface of the first passages 12 and 112, the flow rate is increased compared to the straight hole so that it is smooth. It is possible to flow.

以上説明したように、本発明に係るソケット１とプラグ２とを備える管継手によれば、ソケット本体１’およびプラグ本体２’の流体通路３０，１３０の内周面を、開閉弁受け部４９，１４９に対して流体通路３０，１３０の後端開口３０ａ，１３０ａ側に位置するテーパ面と、流体通路３０，１３０の前端開口３０ｂ，１３０ｂ側に位置するテーパ面とが開閉弁受け部４９，１４９で描くテーパ面に沿って並び、流体通路３０，１３０の後端開口３０ａ，１３０ａから前端開口３０ｂ，１３０ｂにかけて外側に向かって直線的で連続的に傾斜するテーパ面とすることができる。このため、流体通路３０，１３０の断面積を後端開口３０ａ，１３０ａから前端開口３０ｂ，１３０ｂに向けて拡大させることができ、従来の管継手のストレート孔をなす流体通路と比較して通路面積が増大して流体通路３０，１３０を流れる流体の流量を増加させることができる。しかも、ソケット本体１’およびプラグ本体２’は、流体通路がストレート孔である場合と比較して外形寸法の大型化を抑えることができる。   As described above, according to the pipe joint including the socket 1 and the plug 2 according to the present invention, the inner peripheral surfaces of the fluid passages 30 and 130 of the socket main body 1 ′ and the plug main body 2 ′ are connected to the on-off valve receiving portion 49. , 149 and the tapered passages located on the rear end openings 30a, 130a side of the fluid passages 30, 130, and the tapered surfaces located on the front end openings 30b, 130b side of the fluid passages 30, 130 are open / close valve receiving portions 49, It can be a taper surface that is arranged along the taper surface drawn at 149 and linearly and continuously slopes outward from the rear end openings 30a, 130a of the fluid passages 30, 130 to the front end openings 30b, 130b. For this reason, the cross-sectional area of the fluid passages 30 and 130 can be enlarged from the rear end openings 30a and 130a toward the front end openings 30b and 130b, and the passage area compared to the fluid passage forming the straight hole of the conventional pipe joint. The flow rate of the fluid flowing through the fluid passages 30 and 130 can be increased. Moreover, the socket body 1 ′ and the plug body 2 ′ can suppress an increase in size of the outer dimensions as compared with the case where the fluid passage is a straight hole.

また、流体通路３０，１３０の内周面が後端開口３０ａ，１３０ａから前端開口３０ｂ，１３０ｂにかけて連続的なテーパ面を構成するため、流体通路３０，１３０を流れる流体を内周面に沿って安定して円滑に流すことができ、流路抵抗を少なくして流量を増加させることができる。   In addition, since the inner peripheral surface of the fluid passages 30 and 130 forms a continuous tapered surface from the rear end openings 30a and 130a to the front end openings 30b and 130b, the fluid flowing through the fluid passages 30 and 130 flows along the inner peripheral surface. The flow can be made stably and smoothly, and the flow rate can be increased by reducing the flow resistance.

また、結合孔２３，１２３の前端側の内周面にリング受け部２６，１２６が設けられているため、管継手を大型化することなく、前部筒体２０，１２０の結合孔２３，１２３に嵌め込むＯリング２７，１２７を、開閉弁４０，１４０を組み込むときに弁体保持体４１，１４１の外周面から離れた位置に配置しておくことができる。このため、開閉弁４０を組み込んだ後に後部筒体１０，１１０を結合孔２３，１２３に挿入して組み込むことが可能となり、開閉弁４０，１４０の弁体保持体４１，１４１の接触によるＯリング２７，１２７の破損を効果的に防止することができる。なお、前述した実施の形態では、ソケット１とプラグ２の両方にそれぞれ本発明の構成を採用しているが、ソケット１およびプラグ２のいずれか一方のみに本発明の構成を採用することも可能である。   Further, since the ring receiving portions 26 and 126 are provided on the inner peripheral surface on the front end side of the coupling holes 23 and 123, the coupling holes 23 and 123 of the front cylindrical bodies 20 and 120 are not increased in size. The O-rings 27 and 127 to be fitted into the valve body can be disposed at positions away from the outer peripheral surfaces of the valve body holders 41 and 141 when the on-off valves 40 and 140 are assembled. For this reason, the rear cylinders 10 and 110 can be inserted into the coupling holes 23 and 123 after the opening / closing valve 40 is assembled, and the O-ring is brought into contact with the valve body holders 41 and 141 of the opening / closing valves 40 and 140. 27 and 127 can be effectively prevented from being damaged. In the above-described embodiment, the configuration of the present invention is adopted for both the socket 1 and the plug 2. However, the configuration of the present invention can be adopted for only one of the socket 1 and the plug 2. It is.

本発明の一実施形態に係る管継手におけるソケットおよびプラグの分離時の様子を一部を断面で示す側面図である。It is a side view which shows a part in a mode at the time of separation of a socket and a plug in a pipe joint concerning one embodiment of the present invention. 同管継手におけるソケットおよびプラグの結合時の様子を一部を断面で示す側面図である。It is a side view which shows a part in the mode at the time of the coupling | bonding of the socket and plug in the same pipe joint. 同管継手ののソケットにおけるソケット本体の開閉弁受け部の構造の例を示す拡大断面図である。It is an expanded sectional view which shows the example of the structure of the opening-and-closing valve receiving part of the socket main body in the socket of the same pipe joint. 同管継手におけるソケットの組立時の様子を一部を断面で示す側面図である。It is a side view which shows a mode at the time of the assembly of the socket in the same pipe joint in a cross section.

符号の説明Explanation of symbols

１…ソケット
１’…ソケット本体
２…プラグ
２’…プラグ本体
１０，１１０…後部筒体（第１の筒体）
１１，１１１…接続手段（配管接続部）
１２，１１２…第１通路
１３，１１３…接続孔
１４，１１４…中間ナット
１５，１１５，１６，１１６，２５，１２５…ねじ部
２０，１２０…前部筒体（第２の筒体）
２１…ロック手段（結合部）
２２…プラグ挿入空間
２３，１２３…結合孔
２４，１２４…弁座
２６，１２６…リング受け部
２７，５７，１２７，４４，１４４…Ｏリング
２８，１２８…ロックボルト
２９，１２９…第２通路
３０，１３０…流体通路
３０ａ，１３０ａ…後端開口
３０ｂ，１３０ｂ…前端開口
４０，１４０…開閉弁
４１，１４１…弁体保持体
４１ａ，１４１ａ…脚部
４２，１４２…弁体
４２ａ，１４２ａ…弁体部
４３，５４，１４３…圧縮コイルばね
４９，１４９…開閉弁受け部
１８８…ロック溝（結合部）
９０１，９０２…配管
９１０…組立治具 DESCRIPTION OF SYMBOLS 1 ... Socket 1 '... Socket main body 2 ... Plug 2' ... Plug main body 10,110 ... Rear cylinder (1st cylinder)
11, 111 ... connection means (pipe connection part)
12, 112 ... first passage 13, 113 ... connection hole 14, 114 ... intermediate nut 15, 115, 16, 116, 25, 125 ... screw part 20, 120 ... front cylinder (second cylinder)
21 ... Locking means (joining part)
22 ... Plug insertion space 23, 123 ... Coupling hole 24, 124 ... Valve seat 26, 126 ... Ring receiving part 27, 57, 127, 44, 144 ... O-ring 28, 128 ... Lock bolt 29, 129 ... Second passage 30 , 130 ... Fluid passages 30a, 130a ... Rear end openings 30b, 130b ... Front end openings 40, 140 ... Open / close valves 41, 141 ... Valve body holders 41a, 141a ... Leg portions 42, 142 ... Valve bodies 42a, 142a ... Valve bodies Portions 43, 54, 143 ... Compression coil springs 49, 149 ... Opening / closing valve receiving portion 188 ... Lock groove (coupling portion)
901, 902 ... Piping 910 ... Assembly jig

Claims (3)

互いに結合するソケットおよびプラグを有する管継手において、
前記ソケットおよびプラグの少なくとも一方は両端を開放した筒状をなす継手本体と、この継手本体の内部に装着される開閉弁とを備え、
前記継手本体は、
一端部に設けられて配管を接続する配管接続部と、
他端部に設けられて相手部材を結合する結合部と、
この結合部の近傍に形成されて継手本体の径方向内部へ向けて突出して周方向に延びる環状の弁座と、
前記配管接続部から前記弁座にかけて形成された流体通路とを有し、
この流体通路の直径が前記配管接続部から前記弁座にかけて徐々に拡大するものであり、
前記開閉弁は、
前記流体通路の内部に配置されて前記流体通路の内周面に保持される脚部を有する弁体保持体と、
この弁体保持体に継手本体の軸方向に沿って進退自在に保持されて前進時に周縁部が前記弁座に密接する弁体と、
前記弁体保持体と前記弁体との間に設けられ前記弁体に対して前記弁座に押し付ける向きの力を付与する弾性部材と
を備えたものである
ことを特徴とする管継手。 In a pipe joint having a socket and a plug that are joined together,
At least one of the socket and the plug includes a joint body having a cylindrical shape with both ends open, and an opening / closing valve mounted inside the joint body,
The joint body is
A pipe connection provided at one end to connect the pipe;
A coupling part provided at the other end for coupling the mating member;
An annular valve seat formed in the vicinity of the coupling portion and projecting radially inward of the joint body to extend in the circumferential direction;
A fluid passage formed from the pipe connection portion to the valve seat,
The diameter of the fluid passage gradually increases from the pipe connection portion to the valve seat,
The on-off valve is
A valve body holder having a leg portion disposed inside the fluid passage and held on an inner peripheral surface of the fluid passage;
A valve body that is held by the valve body holding body so as to freely advance and retract along the axial direction of the joint body, and a peripheral edge portion thereof is in close contact with the valve seat during advancement;
A pipe joint, comprising: an elastic member provided between the valve body holding body and the valve body and imparting a force in a direction to press the valve body against the valve seat. 前記継手本体は、
他端部の外周面に第１のねじ部が形成された第１の筒体と、
一端部に前記第１の筒体の他端部が挿入されるとともにこの一端部の内周面に前記第１のねじ部と螺合する第２のねじ部が形成された第２の筒体とを結合して構成され、
前記弁体保持体は、その脚部が前記第１の筒体の他端部に当接して前記弾性部材によって前記第１の筒体の他端部に押し付けられている
ことを特徴とする請求項１記載の管継手。 The joint body is
A first cylinder having a first threaded portion formed on the outer peripheral surface of the other end;
A second cylindrical body in which the other end portion of the first cylindrical body is inserted into one end portion and a second threaded portion is formed on the inner peripheral surface of the one end portion to be screwed with the first threaded portion. And is composed of
The valve body holding body has a leg portion in contact with the other end portion of the first cylindrical body and is pressed against the other end portion of the first cylindrical body by the elastic member. Item 1. A pipe joint according to Item 1. 前記継手本体は、前記流体通路の直径が前記配管接続部から前記弁座にかけて滑らかに連続的に拡大されていることを特徴とする請求項１又は２記載の管継手。   3. The pipe joint according to claim 1, wherein the joint body has a diameter of the fluid passage that is smoothly and continuously enlarged from the pipe connection portion to the valve seat.
JP2007032479A 2007-02-13 2007-02-13 Pipe fitting Active JP5090750B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190005230A (en) 2016-05-24 2019-01-15 니토 코키 가부시키가이샤 A tube coupling comprising a female coupling member and a male coupling member

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3498324A (en) * 1967-03-17 1970-03-03 Snap Tite Inc Quick connect high pressure coupling
JPS616093U (en) * 1984-06-16 1986-01-14 日東工器株式会社 pipe fittings
JPS61206191U (en) * 1985-06-14 1986-12-26
JPS639597U (en) * 1986-07-07 1988-01-22
JPH11190485A (en) * 1997-12-26 1999-07-13 Nitto Kohki Co Ltd Socket for pipe coupling
JP2002340266A (en) * 2001-05-17 2002-11-27 Kazuo Yano Opening and closing valve structure of internal passage opening and closing type pipe joint device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3498324A (en) * 1967-03-17 1970-03-03 Snap Tite Inc Quick connect high pressure coupling
JPS616093U (en) * 1984-06-16 1986-01-14 日東工器株式会社 pipe fittings
JPS61206191U (en) * 1985-06-14 1986-12-26
JPS639597U (en) * 1986-07-07 1988-01-22
JPH11190485A (en) * 1997-12-26 1999-07-13 Nitto Kohki Co Ltd Socket for pipe coupling
JP2002340266A (en) * 2001-05-17 2002-11-27 Kazuo Yano Opening and closing valve structure of internal passage opening and closing type pipe joint device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190005230A (en) 2016-05-24 2019-01-15 니토 코키 가부시키가이샤 A tube coupling comprising a female coupling member and a male coupling member
US10663099B2 (en) 2016-05-24 2020-05-26 Nitto Kohki Co., Ltd Pipe coupling comprising female coupling member and male coupling member

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