JP4662847B2 - Fluid pipe fitting - Google Patents

Description

  The present invention relates to a fluid pipe joint including a male pipe joint (plug) and a female pipe joint (socket) suitable for connecting pipes through which fluid flows.

  It consists of a socket with a built-in slide valve and a valve pusher and a plug with a built-in slide valve. When both are connected, the slide valve in the socket is pushed by the tip of the plug and retreats to open the flow path, and the slide in the plug Fluid couplings of a type in which a valve is pushed by a valve pusher of a socket and retracted to open a flow path are widely used in various technical fields.

  As shown in FIG. 9, in the conventional fluid pipe joint, the plug portion 90 of the plug body P1 is inserted into the plug insertion port 80 of the socket body S1, and the tip portion of the plug portion 90 is used as the plug receiving portion of the sleeve valve body 82. After engaging the tip end surface 93 of the slide valve body 91 of the plug main body P1 with the tip end surface 85 of the inner cylinder portion 83 of the socket main body S1, when the plug main body P1 is further pushed in, the tip end of the plug portion 90 is obtained. The portion pushes the sleeve valve body 82 against the urging force of the urging spring 84 through the plug receiving portion, and the distal end surface 85 of the inner cylinder portion 83 of the socket body S1 pushes the slide valve body 91 of the plug body P1. The socket body S1 is pushed in against the urging force of the urging spring 94 so that the flow path of the socket body S1 and the flow path of the plug body P1 are in communication with each other.

Japanese Utility Model Laid-Open No. 7-12663

  In the conventional fluid pipe coupling shown in FIG. 9, the front end surface 85 of the inner cylinder portion 83 of the socket main body S1 and the front end surface 93 of the slide valve body 91 of the plug main body P1 are chamfered. When the main body P1 is connected, the gas in the chamfered portion may be mixed into the fluid (liquid). In the socket body S1, the space formed by the inner cylinder portion 83, the sleeve valve body 82, and the outer cylinder portion 86 becomes negative pressure when the sleeve valve body 82 moves in the distal direction, and when pushed backward. Pressure increases. And while this phenomenon is repeatedly performed, gas enters between the O-rings 87 and 88 disposed in the recesses provided in the front and rear of the sleeve valve body 82, and this gas passes between the socket body S1 and the plug body P1. When connecting, the problem of mixing in the fluid has arisen. Further, when the fluid pipe joint is separated, the movement of the sleeve valve element 82 is delayed due to negative pressure or the like generated when the sleeve valve element 82 moves in the distal direction, and leaks to the outside when the fluid is gas. was there.

  The object of the present invention is to solve the above-mentioned problems when attaching and detaching the conventional fluid pipe joint shown in FIG. 9, and to provide a fluid pipe joint that does not contain gas and does not leak. It is.

  The fluid pipe joint of the present invention comprises a male pipe joint and a female pipe joint. In the fluid pipe joint connectable by inserting the male pipe joint into the female pipe joint, the male pipe joint has an inner peripheral surface. A cylindrical first main body in which a seal ring is mounted on the inner peripheral surface of the tip cylindrical portion formed in a small diameter, and is housed in the first main body so as to be movable back and forth, and is urged in the tip direction by a spring. The female pipe joint has a cylindrical second body in which a small diameter portion is formed on an inner peripheral surface, and a seal ring is mounted on the small diameter portion, and the second body A center shaft arranged at the axis of the center shaft, and a rear end portion of the center shaft that is movably moved back and forth, and is biased in a distal direction by a spring, and has an outer peripheral surface that is continuous with the outer peripheral surface of the head of the center shaft. Main poppet to form and the center The sub-poppet is slidably disposed on the outer peripheral surface of the shaft and the main poppet, is urged in the distal direction by a spring, and has a seal ring attached to the inner peripheral surface. The spring is held between the small-diameter portion of the second main body and the head of the center shaft. When the sub poppet is retracted to a predetermined position, the main poppet is also retracted by the sub poppet to form a flow path. It is characterized by being.

  And when the fluid pipe joint of the present invention separates the connected male pipe joint and female pipe joint, there is no space in which negative pressure is generated even if the sub-poppet moves in the distal direction, so the gas is sucked in. And no gas is mixed into the fluid.

  Furthermore, the present invention is configured such that the tip surface of the first main body of the male pipe joint and the tip face of the poppet form the same plane, and the tip face of the center shaft and the tip face of the sub-poppet in the female pipe joint are formed. By configuring so as to form the same plane, it is possible to prevent further mixing of gas into the fluid when connecting and separating the male pipe joint and the female pipe joint.

  Furthermore, the present invention provides an operating body that moves in the axial direction outside the second body, a locking body that is fitted in a through hole provided in the second body, a locking groove that is provided in the first body, A locking mechanism comprising: a male pipe joint and a female joint, wherein the locking body is configured to be moved in a radial direction on an operating slope provided on the operating body and inserted into the locking groove. One-touch connection and disconnection from the pipe joint.

  In the fluid pipe coupling of the present invention, when the connected male pipe coupling and female pipe coupling are separated, there is no space for generating a negative pressure even if the sub poppet moves in the distal direction, and no gas is sucked. Therefore, gas is not mixed in the fluid, and the tip surface of the first main body of the male pipe joint and the tip face of the poppet are configured to form the same plane. Since the tip surface of the shaft and the tip surface of the sub-poppet form the same plane, when connecting the male pipe joint and the female pipe joint, the tip face of the poppet and the tip face of the center shaft Since no gas is present between them, the gas can be prevented from being mixed into the fluid.

  FIG. 1 shows an embodiment of the present invention, and is a cross-sectional view showing a male pipe joint P on the plug side and a female pipe joint S on the socket side on the same drawing. The fluid pipe joint of the present invention will be described based on FIG.

  The male pipe joint P on the plug side includes a first main body 1 and a poppet 2. The first body 1 includes a first female cap 3 and a nipple 4.

  The first female cap 3 is formed of a small-diameter cylinder 3a at the front end and a large-diameter cylinder 3b at the rear end, and a male screw is screwed on the outer peripheral surface of the small-diameter cylinder 3a. A female screw is screwed on the inner peripheral surface of the large-diameter cylindrical body 3b so that a fluid pipe is connected.

  The nipple 4 is formed of a cylindrical body, a groove 13 is provided on the outer peripheral surface of the intermediate portion thereof, a female screw is screwed at the rear end thereof, and the cylindrical body 3a of the first female cap 3 is provided on the cylindrical body 3a. The male screw is screwed with an O-ring. A tip cylinder portion 4 a having a small diameter is formed at the tip portion of the nipple 4 via a taper portion 10. The inner peripheral surface 6 of the distal end cylindrical portion 4a is formed with a small diameter and has a recess, and an O-ring 15 as a seal ring is attached to the recess. A large-diameter cylindrical inner peripheral surface 8 is formed through a tapered portion 7 behind the small-diameter inner peripheral surface 6 of the distal end cylindrical portion 4a.

  The poppet 2 is composed of a tip portion 2a and a large-diameter cylindrical portion 2b. The outer peripheral surface of the tip portion 2 a of the poppet 2 is formed to have substantially the same diameter as the inner peripheral surface 6 of the tip tube portion 4 a of the nipple 4, and the outer peripheral surface of the tip portion 2 a of the poppet 2 and the tip tube portion 4 a of the nipple 4. The inner peripheral surface 6 of the nipple 4 is sealed by an O-ring 15 attached to the concave portion of the distal end cylindrical portion 4 a of the nipple 4. The large-diameter cylindrical portion 2b of the poppet 2 is formed at the rear portion of the tip portion 2a via a tapered portion 9, and a plurality of through holes 17 are formed in the tapered portion 9. The poppet 2 is accommodated in the nipple 4 so as to be movable back and forth, and is urged in the distal direction by a first spring 19 disposed on the first female cap 3 and the inner peripheral surface of the poppet 2. The poppet 2 is held so that the tip surface of the poppet 2 and the tip surface of the nipple 4 form the same plane when the taper portion 9 abuts against the taper portion 7 of the nipple 4.

Next, the female pipe joint S on the socket side will be described.
The female pipe joint S includes a second main body 30, a center shaft 31 that is fixed to the second main body 30 by an E ring, a main poppet 40, and a sub poppet 41.

  The second main body 30 includes a cylindrical coupling 33 and a second female cap 34, and the coupling 33 and the second female cap 34 are screwed together via an O-ring. A female screw is screwed on the inner peripheral surface of the rear portion of the second female cap 34 and is configured to be connected to a fluid pipe.

  The inner peripheral surface of the coupling 33 is formed in the small diameter part 36 by the front taper part 38 and the rear taper part 39, and the coupling 33 has a recess formed in the inner peripheral surface of the small diameter part 36. An O-ring 46 which is a seal ring is attached.

  The center shaft 31 includes a large-diameter head portion 31a and a support rod 31b formed at the rear portion of the head portion 31a. The support rod 31b is formed via a rear end tapered portion at the rear end of the head portion 31a, and the support body 37 of the second female cap 34 so that the center shaft 31 is positioned at the axial center of the coupling 33. It is fixed by E-ring. A plurality of through holes are formed in the support 37, and fluid can flow through the support 37.

The main poppet 40 and the sub poppet 41 constitute a sleeve valve.
The sub-poppet 41 includes a tip portion 41a and a large-diameter cylindrical portion 41b. A concave groove is formed on the inner peripheral surface of the distal end portion 41a, and an O-ring 44, which is a seal ring, is mounted so that fluid does not leak between the head portion 31a of the center shaft 31 and the sub-poppet 41. It is sealed. The large-diameter cylindrical portion 41b is formed at the rear portion of the tip portion 41a via a tapered portion 41c, and a plurality of through holes 48 are formed in the tapered portion 41c. The sub poppet 41 is accommodated in the coupling 33 so as to be movable back and forth, and is biased in the distal direction by a second spring 54 provided on the outer periphery of the cylindrical portion 41b. The sub-poppet 41 has its tapered portion 41c abutting against the rear tapered portion 39 of the small-diameter portion of the coupling 33, so that the tip surface of the sub-poppet 41 and the tip surface of the head portion 31a of the center shaft 31 form the same plane. Is held in.

  The main poppet 40 includes a front cylinder portion 40a having the same outer diameter as the outer diameter of the head portion 31a of the center shaft 31, and a rear cylinder portion 40b formed at the rear portion thereof via a taper portion 40c. The main poppet 40 is disposed so as to be movable back and forth behind the head 31 a of the center shaft 31, and a flow path 52 is formed between the inner surface of the main poppet 40 and the support rod 31 b of the center shaft 31. . A third spring 55 having one end supported by the support body 37 is disposed inside the rear cylinder portion 40 b, and the main poppet 40 has a tip tapered portion of the main poppet 40 that is the head of the center shaft 31 by the third spring 55. The portion 31a is biased so as to contact the rear end taper portion. A plurality of through holes 42 are formed in the tapered portion 40 c of the main poppet 40.

The operating body 60 is provided on the outer cylindrical surface of the coupling 33 so as to slide in the front-rear direction. A snap ring 62 is attached to the outer peripheral surface of the front end portion of the coupling 33, and the operation slope 60a of the operation body 60 abuts against the snap ring 62 so that the operation body 60 does not come out forward. . A repulsion spring 61 is provided between the operating body 60 and the coupling 33, and the operating body 60 is biased toward the distal end of the coupling 33. Further, a plurality of through holes 63 are formed on the front end portion of the coupling 33 on the circumference, and a steel ball 64 as a locking body is fitted into the through hole 63. The through hole 63 is configured such that the inner diameter side of the coupling 33 is slightly narrowed so that the steel ball 64 does not fall inward, and the outer side is widened so that the operating body 60 is retracted to retract the steel ball. 64 is configured to be free.
The operating body 60, the through hole 63, the steel ball 64, and the like constitute a lock mechanism when the male pipe joint P and the female pipe joint S are connected and coupled.

  2-7 is sectional drawing which shows the operation | movement at the time of connecting the fluid pipe coupling in embodiment of this invention mentioned above. In the state of FIG. 1 and FIG. 2 in which the male pipe joint P and the female pipe joint S are not connected, the male pipe joint P is located at the position of the O-ring 15 where the poppet 2 is in the distal end cylinder portion 4a of the nipple 4. It effectively prevents fluid leakage. In the female pipe joint S, the outer peripheral surface of the sub-poppet 41 is located at the position of the O-ring 46 of the coupling 33, and the O-ring 44 of the sub-poppet 41 is located at the position of the head 31a of the center shaft 31 to effectively prevent fluid leakage. To prevent.

  FIG. 2 shows a state in which the male pipe joint P is inserted into the female pipe joint S and the tip surface of the poppet 2 is in contact with the tip surface of the head portion 31 a of the center shaft 31. At this time, the front end surface of the nipple 4 is also in contact with the front end surface of the sub poppet 41. Since the tip surface of the poppet 2 and the tip surface of the head portion 31a of the center shaft 31 are not chamfered and have a flat surface, no space is formed on the contact surface between them. .

  FIG. 3 shows a state in which the nipple 4 is further inserted into the female pipe joint S from FIG. 2 and the tip of the tip tube portion 4 a of the nipple 4 is inserted to the position of the O-ring 46 of the coupling 33.

  At this time, the outer peripheral surface of the tip tube portion 4a of the nipple 4 slides on the inner peripheral surface of the small diameter portion 36 of the coupling 33, and the inner peripheral surface slides on the outer peripheral surface of the head portion 31a of the center shaft 31. It is pushed in while moving.

  The sub poppet 41 is pushed by the distal end cylindrical portion 4a of the nipple 4 and retracts while compressing the second spring 54, and the inner peripheral surface of the distal end portion 41a slides on the outer peripheral surface of the head portion 31a of the center shaft 31. The poppet 40 moves to the outer peripheral surface of the front cylinder portion 40a. The poppet 2 is pushed by the head portion 31 a of the center shaft 31 and moves backward while compressing the first spring 19.

  In the state of FIG. 3, the outer peripheral surface of the sub poppet 41 is at the position of the O-ring 46 of the coupling 33, and the O-ring 44 of the sub-poppet 41 is positioned at the head portion 31 a of the center shaft 31 to close the flow path 52. Does not leak. Further, the distal end portion 2a of the poppet 2 is located at the position of the O-ring 15 attached to the distal end cylindrical portion 4a of the nipple 4, and the flow path 51 is closed, so that the fluid does not leak.

  FIG. 4 shows a state in which the nipple 4 is further inserted into the female pipe joint S from FIG. 3 and the tip of the tip tube portion 4a of the nipple 4 is inserted to the position of the rear end of the head portion 31a of the center shaft 31. ing.

  At this time, as in FIG. 3, the distal end cylindrical portion 4 a of the nipple 4 slides on the inner peripheral surface of the small diameter portion 36 of the coupling 33, and the inner peripheral surface is the head of the center shaft 31. It is pushed in while sliding on the outer peripheral surface of 31a.

  The sub poppet 41 is pushed by the distal end cylindrical portion 4a of the nipple 4 and retracts while compressing the second spring 54, and its inner peripheral surface slides on the outer peripheral surface of the front cylindrical portion 40a of the main poppet 40. The tip portion moves to the outer peripheral surface of the front cylinder portion 40a of the main poppet 40. The poppet 2 is pushed by the head portion 31 a of the center shaft 31 and compresses the first spring 19, and the tip portion 2 a moves backward to the rear end of the tip tube portion 4 a of the nipple 4.

  In the state of FIG. 4, the O-ring 44 attached to the tip portion 41 a of the sub-poppet 41 is positioned at the front cylinder portion 40 a of the main poppet 40 that is pressed against the rear end taper portion of the head portion 31 a of the center shaft 31. ing. Further, the outer peripheral surface of the tip cylinder portion 4a of the nipple 4 is at the position of the O-ring 46 of the coupling 33, and the O-ring 15 of the inner peripheral surface is at the position of the head portion 31a of the center shaft 31, so 52 is closed and fluid does not leak. Further, the head 31a of the center shaft 31 is located at the position of the O-ring 15 of the nipple 4 and the flow path 51 is closed, so that the fluid does not leak.

  5, the operating body 60 is moved backward, and the nipple 4 is further inserted into the female pipe joint S than in FIG. 4, so that the rear end of the tip tube portion 4 a of the nipple 4 is behind the head 31 a of the center shaft 31. The state where it is inserted to the end position is shown.

  At this time, the distal end cylindrical portion 4a of the nipple 4 slides on the inner peripheral surface of the small diameter portion 36 of the coupling 33 and the inner peripheral surface thereof is the head of the center shaft 31 as in FIG. It is pushed in while sliding the outer peripheral surface of 31a and the front cylinder part 40a of the main poppet 40. The sub poppet 41 is pushed by the tip cylinder portion 4 a of the nipple 4, and its inner circumferential surface moves backward while sliding on the outer circumferential surface of the front cylinder portion 40 a of the main poppet 40, and the tapered portion 41 c of the sub poppet 41 is It abuts on the tapered portion 40c. The poppet 2 is pushed by the head portion 31 a of the center shaft 31 and moves backward while compressing the first spring 19, and moves backward from the rear end of the distal end cylindrical portion 4 a of the nipple 4.

  In the state of FIG. 5, the outer peripheral surface of the front end cylindrical portion 4 a of the nipple 4 is at the position of the O-ring 46 of the coupling 33, and the O-ring 15 of the front end cylindrical portion 4 a is tapered at the rear end of the head portion 31 a of the center shaft 31. Since the flow path 52 is closed at the position of the outer peripheral surface of the front cylindrical portion 40a of the main poppet 40 pressed against the portion, the fluid does not leak. In addition, the head portion 31a of the center shaft 31 is inserted to the position of the O-ring 15 of the nipple 4, and the flow path 51 is closed by the head portion 31a, so that fluid does not leak.

  6, the nipple 4 is further inserted into the female pipe joint S than in FIG. 5, and the rear end of the tip tube portion 4 a of the nipple 4 is inserted to a position behind the rear end of the head portion 31 a of the center shaft 31. Shows the state.

  At this time, the nipple 4 is pushed in until the taper portion 10 contacts the front taper portion 38 of the coupling 33, and the sub poppet 41 is pushed back by the distal end cylinder portion 4 a of the nipple 4. The main poppet 40 is moved rearward by the tapered portion 40 c of the sub-poppet 41, and the tip thereof is separated from the surface of the rear end tapered portion of the head portion 31 a of the center shaft 31.

  In the state of FIG. 6, the front end of the main poppet 40 is separated from the rear end taper portion of the head portion 31 a of the center shaft 31 to form a flow path 52, and the through hole 17 of the poppet 2 and the large diameter portion of the nipple 4 The flow path 51 is formed and the fluid flows. At this time, since the outer peripheral surface of the nipple 4 is sealed by the O-ring 46 of the small diameter portion 36 of the coupling 33, the fluid does not leak to the outside.

  FIG. 7 shows a state in which the operating body 60 moves forward by the repulsive force of the repulsive spring 61 and hits the snap ring 62 and is stopped in the state shown in FIG. At this time, the steel ball 64 is pushed by the operation slope 60 a of the operation body 60 and is pushed radially inward, and enters the groove 13 of the nipple 4. In the state of FIG. 7, the steel ball 64 enters the groove 13 of the nipple 4 and the male pipe joint P and the female pipe joint S are connected and locked.

  The above description of the operation is an explanation of the process of moving from the state in which the male pipe joint P and the female pipe joint S are separated to the connected state, but the process of moving from the connected state to the separated state is merely by moving the operating body 60 backward. Explained in reverse order. The male pipe joint P and the female pipe joint S are instantaneously separated, and the main poppet 40 and the sub poppet 41 are instantaneously moved in the distal direction by the second and third springs 54 and 55, but negative pressure is generated. Therefore, there is almost no gas mixed into the fluid, and there is no fluid leakage.

  The fluid pipe joint of the present invention can also be used as a fluid pipe joint of oil-based ink or organic solvent.

  Further, the fluid pipe coupling of the present invention is not limited to the above-described embodiment, and various modes are conceivable. In the present invention, the locking mechanism is not necessarily limited to that of the above embodiment. As another embodiment, for example, a fluid pipe is connected only to the female pipe joint S, and the male pipe joint P is simply inserted into the female pipe joint S. It can be discharged from the left end in the figure. When stopping the discharge, the male pipe joint may be removed from the female pipe joint.

  In addition, the through hole 48 provided in the sub poppet 41 and the through hole 42 provided in the main poppet 40 are not necessarily required, but when the transition from the coupled state to the separated state occurs, fluid flows from the through holes 42 and 48 and is negative. Since no pressure space is created, the male pipe joint P and the female pipe joint S are separated more instantly.

  Further, a plurality of legs are provided on the inner peripheral surface side of the main poppet 40, and the main poppet 40 is slid while being guided by sliding the outer periphery of the support rod 31b of the center shaft 31 with the legs. May be.

  Further, if a center shaft is provided on the male joint side and the poppet is guided by the center shaft, the through hole 17 provided in the poppet becomes unnecessary.

  Further, a plurality of O-rings may be provided in the distal end cylindrical portion 4 a of the nipple 4 and the small diameter portion 36 of the coupling 33.

  FIG. 8 shows an application example of the fluid pipe joint of the present invention. A plastic tube or the like connected to the end of the nipple 4 by a cap nut 66 incorporating a free sleeve 68 instead of the first female cap 3. A fluid pipe such as a plastic tube connected to the end of the second female cap 34 by a cap nut 66 with a built-in free sleeve 68 is attached. An adapter b67 that can be directly tightened and fixed is attached.

  In the female screw structure of the first female cap 3 and the second female cap 34 shown in FIGS. 1 to 7, it is necessary to screw in a joint for connecting a fluid pipe such as a plastic tube. A fluid pipe such as a tube can be connected, which is highly convenient. Further, it is possible to prevent the fluid from being accumulated due to the generation of the space generated when the male screw is screwed into the female screw, and to form the minimum required flow path.

  Furthermore, in this application example, the free sleeve 68 built in the cap nut 66 is attached to the cap nut 66 via a snap ring 69, but is free with respect to the rotation of the cap nut 66. Therefore, when the cap nut 66 is rotated and tightened, the free sleeve 68 moves forward without rotating together, so that the twist of the fluid tube such as a plastic tube to be connected can be prevented.

Sectional drawing which shows the fluid pipe joint of the state which isolate | separated the male pipe joint and the female pipe joint which shows embodiment of this invention. Sectional drawing which shows the operation state in the middle of the connection or isolation | separation process in the fluid pipe coupling of this invention. FIG. 3 is a cross-sectional view showing a state where the male pipe joint is pushed further into the female pipe joint than in FIG. 2 in the connection or separation process in the fluid pipe joint of the present invention. FIG. 4 is a cross-sectional view showing a state in which the male pipe joint is pushed further into the female pipe joint than in FIG. 3 in the connection or separation process in the fluid pipe joint of the present invention. FIG. 5 is a cross-sectional view showing a state in which the male pipe joint is pushed further into the female pipe joint than in FIG. 4 in the connection or separation process in the fluid pipe joint of the present invention. FIG. 6 is a cross-sectional view showing a state in which the male pipe joint is pushed further into the female pipe joint than in FIG. 5 in the connection or separation process in the fluid pipe joint of the present invention. Sectional drawing which shows the state at the time of the completion of a connection in the fluid pipe coupling of this invention. Sectional drawing which fractured | ruptured partially which shows the aspect which applied the fluid pipe coupling of this invention. Sectional drawing which shows the conventional fluid pipe joint.

Explanation of symbols

P ... male pipe joint, S ... female pipe joint, 1 ... first body, 2 ... poppet, 3 ... first female cap, 3a ... small diameter cylinder, 3b ... large diameter cylinder, 4 ... nipple, 4a ... Tip cylindrical portion, 6 ... inner peripheral surface, 7 ... tapered portion, 8 ... cylindrical inner peripheral surface, 9 ... tapered portion, 10 ... tapered portion, 13 ... groove, 15 ... O-ring, 17 ... through hole, 19 ... first Spring, 30 ... second body, 31 ... center shaft, 31a ... head, 31b ... support rod, 33 ... coupling, 34 ... second female cap, 36 ... small diameter portion, 37 ... support, 38 ... front taper 39, rear taper portion, 40 ... main poppet, 40a ... front tube portion, 40b ... rear tube portion, 40c ... taper portion, 41 ... sub poppet, 41a ... tip portion, 41b ... large diameter tube portion, 41c ... taper Part 42 ... through hole 46 ... O-ring 48 ... through , 51 ... flow path, 52 ... flow path, 54 ... second spring, 55 ... third spring, 60 ... operating body, 60a ... operating slope, 62 ... snap ring, 63 ... through hole, 64 ... steel ball, 65 ... Adapter a, 66 ... Cap nut, 67 ... Adapter b, 68 ... Free sleeve, 69 ... Snap ring

Claims (3)

In a fluid pipe joint that consists of a male pipe joint and a female pipe joint and can be connected by inserting the male pipe joint into the female pipe joint.
The male pipe joint is accommodated in a cylindrical first main body in which a seal ring is mounted on an inner peripheral surface of a distal end cylinder portion having an inner peripheral surface formed in a small diameter, and is movable in the front-rear direction in the first main body. It is composed of a poppet that is biased in the tip direction by a spring,
The female pipe joint has a cylindrical second body in which a small diameter portion is formed on an inner peripheral surface, and a seal ring is mounted on the small diameter portion, and a center shaft disposed at an axis of the second main body, A main poppet which is arranged at the rear part of the center shaft so as to be movable back and forth and is biased in the distal direction by a spring, and forms an outer peripheral surface continuous with the outer peripheral surface of the head of the center shaft, the center shaft, A sub-poppet that is slidably arranged on the outer peripheral surface of the main poppet and is urged in the tip direction by a spring, and a seal ring is mounted on the inner peripheral surface,
The sub poppet is held between the small diameter portion of the second main body and the head of the center shaft by the spring, and when the sub poppet is retracted to a predetermined position, the main poppet is also retracted by the sub poppet to form a flow path. A fluid pipe joint characterized by being made.   The front end surface of the first main body of the male pipe joint and the front end face of the poppet are configured to form the same plane, and the front end face of the center shaft and the front end face of the sub poppet in the female pipe joint The fluid pipe joint according to claim 1, wherein the two are configured to form the same plane.   A locking mechanism comprising: an operating body that moves in an axial direction outside the second body; a locking body that is fitted in a through hole provided in the second body; and a locking groove that is provided in the first body. The said latching body is comprised so that it may be moved to radial direction by the operation slope provided in the said operation body, and it may be inserted in the said latching groove | channel. Fluid pipe fittings.

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