Pipe joint

Abstract

The invention provides a pipe joint which can reduce the whole length and the outer diameter of a coupler main body and can prevent a locking sleeve from falling off. A pipe joint (100) includes a male mold member (10) and a female mold member (20) connected to each other, the female mold member (20) including: a coupler body (21) having a through-hole (21a) into which the male mold member (10) is inserted; an outer peripheral sleeve (28) provided on the outer periphery of the coupler body (21) and movable along the central axis of the through hole (21a); a lock sleeve (31) which is screwed to a male screw part (21c) formed on the outer periphery of the coupler body (21), rotates around the central axis, moves along the central axis, and locks the outer peripheral sleeve (28); and an adapter (22) which is fastened to the coupler main body (21) by being screwed with the male thread part (21c), and which prevents the lock sleeve (31) from falling off.

Description

TECHNICAL FIELD

[0001] The present application relates to a pipe joint. BACKGROUND

[0002] A pipe joint in which a male member is inserted into a coupling body of a female member to connect pipes is known. A pipe joint disclosed in Patent Literature 1 includes an outer peripheral sleeve movably provided to an outer periphery of a coupling body.

[0003] In the pipe joint disclosed in Patent Literature 1, the female member includes a locking sleeve that is screwed with an outer thread portion formed in the outer periphery of the coupling body. The outer peripheral sleeve is locked by rotational movement of the locking sleeve. The coupling body is provided with a flange portion that protrudes toward a radial outer side, and the locking sleeve is prevented from falling off by the flange portion. PRIOR ART DOCUMENTS PATENT LITERATURE

[0004] Patent Literature 1: International Publication No. 2015 / 137027 SUMMARY PROBLEMS TO BE SOLVED BY THE INVENTION

[0005] In the pipe joint disclosed in Patent Literature 1, the locking sleeve is prevented from falling off by the flange portion provided to the coupling body. The flange portion protrudes toward the radial outer side, and therefore the overall length and the outer diameter of the coupling body are increased in correspondence with the provision of such a flange portion.

[0006] An object of the present application is to provide a pipe joint that can reduce the overall length and the outer diameter of a coupling body and can prevent a locking sleeve from falling off. MEANS FOR SOLVING THE PROBLEMS

[0007] A pipe joint according to the present application includes a male member and a female member that are connected to each other, the female member including a coupling body, an outer peripheral sleeve, a locking sleeve, and an adapter, wherein the coupling body has a through-hole into which the male member is inserted; the outer peripheral sleeve is provided to an outer periphery of the coupling body and is movable along a central axis of the through-hole; the locking sleeve is screwed with an outer thread portion formed in the outer periphery of the coupling body, is movable along the central axis by rotation about the central axis, and locks the outer peripheral sleeve; and the adapter is fastened to the coupling body by screwing with the outer thread portion and prevents the locking sleeve from falling off. EFFECT OF THE INVENTION

[0008] According to the present application, the adapter is fastened to the coupling body and prevents the locking sleeve from falling off. Therefore, it is not necessary to provide the coupling body with a flange portion that protrudes toward the radial outside. In addition, since the coupling body does not have the flange portion, the length of the coupling body is reduced. Therefore, it is possible to provide a pipe joint that can reduce the length and the outer diameter of the coupling body and that can prevent the locking sleeve from falling off. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 is a half sectional view of a pipe joint according to a first embodiment, showing a state in which a male mold member and a female mold member are separated. Figure 2 is a half sectional view of a pipe joint according to a first embodiment, showing a state in which the male mold member is inserted into the female mold member. Figure 3 is a half sectional view of a pipe joint according to a first embodiment, showing a state in which the locking sleeve is moved to contact the outer peripheral sleeve from Figure 2 the state shown in Figure 4 is an enlarged view of A portion shown in Figure 3 Figure 5 is a half sectional view of a pipe joint according to a second embodiment, showing a state in which a male mold member and a female mold member are separated. Figure 6 is a half sectional view of a pipe joint according to a third embodiment, showing a state in which a male mold member and a female mold member are separated. DETAILED DESCRIPTION

[0010] Embodiments of the present application will be explained in detail below with reference to the accompanying drawings. The following embodiments shown below are only one example of the present application, and the present application is not limited thereto. In the following description regarding each embodiment, the same symbols are given to the same structures, and the explanation is appropriately omitted.

[0011] <First Embodiment> Figure 1 is a half sectional view of a pipe joint 100 according to a first embodiment. As shown in Figure 1 , the pipe joint 100 includes a male mold member 10 and a female mold member 20 that are connected to each other. Figure 1 is shown in

[0012] ​The male mold member 10 includes a joint 11 having a through-hole 11a and a male-side adapter 12 mounted on the joint 11. An annular groove 11b extending around a center axis of the through-hole 11a is formed on an outer periphery of the joint 11. An annular protrusion 11c protruding toward a radially inner side of the through-hole 11a is formed on an inner periphery of the joint 11. One opening of the through-hole 11a is formed by the protrusion 11c.

[0013] A portion of the male-side adapter 12 is inserted into the through-hole 11a through the other opening of the through-hole 11a and is screwed with an internal thread portion formed on an inner periphery of the through-hole 11a. A through-hole 12a is formed on the male-side adapter 12, and a flow path of the male mold member 10 is formed by the through-hole 11a and the through-hole 12a. An external thread portion for mounting on an apparatus machine or a pipe, not shown, is formed on the male-side adapter 12. In a state where the pipe is mounted on the male-side adapter 12, the flow path of the male mold member 10 is continuous with an internal space of the pipe, and a fluid flows between the flow path of the male mold member 10 and the internal space of the pipe.

[0014] A sealing member 13 is provided between the joint 11 and the male-side adapter 12. The joint 11 and the male-side adapter 12 are closed by the sealing member 13. The sealing member 13 is, for example, an O-ring.

[0015] In addition, the male mold member 10 includes a male-side valve 14 accommodated in the through-hole 11a, a male-side valve spring 15 applying a force to the male-side valve 14 toward the protrusion 11c of the joint 11, and a male-side valve stopper 16 supporting the male-side valve spring 15. The male-side valve stopper 16 is held by the male-side adapter 12 in the through-hole 11a of the joint 11. A through-hole 16a is formed on the male-side valve stopper 16 so as not to block the flow path formed by the through-hole 11a and the through-hole 12a.

[0016] The male-side valve 14 is slidably supported by the male-side valve stopper 16. A male-side valve seat 17 is provided on the male-side valve 14, and the male-side valve seat 17 abuts against the protrusion 11c by a force of the male-side valve spring 15. In a state where the male-side valve seat 17 abuts against the protrusion 11c, the flow path of the male mold member 10 is closed by the male-side valve seat 17. When the male-side valve 14 moves in a direction away from the protrusion 11c against the force of the male-side valve spring 15, the male-side valve seat 17 is separated from the protrusion 11c, and the flow path of the male mold member 10 is opened.

[0017] The female mold member 20 includes a coupler body 21 having a through-hole 21a and a female-side adapter 22 attached to the coupler body 21. The joint 11 of the male mold member 10 is inserted into the through-hole 21a. The female-side adapter 22 is formed with a through-hole 22a. A portion of the coupler body 21 is inserted into the through-hole 22a, and a flow path through the female mold member 20 is formed through the through-hole 21a and the through-hole 22a. The female-side adapter 22 is formed with an external thread portion for mounting a pipe not shown. In a state where the pipe is mounted to the female-side adapter 22, the flow path of the female mold member 20 is continuous with an internal space of the pipe, and fluid flows between the flow path of the female mold member 20 and the internal space of the pipe.

[0018] A seal member 23 is provided between the coupler body 21 and the female-side adapter 22. The coupler body 21 and the female-side adapter 22 are closed by the seal member 23. The seal member 23 is, for example, an O-ring.

[0019] A seal member 24 is provided on an inner periphery of the coupler body 21. In a state where the joint 11 of the male mold member 10 is inserted into the through-hole 21a of the coupler body 21, the seal member 24 is disposed between the coupler body 21 and the joint 11, and the coupler body 21 and the joint 11 are closed. The seal member 24 is, for example, an O-ring.

[0020] Further, the female mold member 20 includes a valve receiver 33 housed in the through-hole 21a, a female-side valve 34 disposed between an inner periphery of the through-hole 21a and an outer periphery of the valve receiver 33, a female-side valve spring 35 that exerts a force on the female-side valve 34, and a female-side valve stopper 36 that supports the female-side valve spring 35. The female-side valve stopper 36 is fixed to the coupler body 21 by the female-side adapter 22. The female-side valve stopper 36 is formed with a through-hole 36a so as not to block the flow path formed by the through-hole 21a and the through-hole 22a.

[0021] The valve receiver 33 is fixed to the female-side valve stopper 36 with a snap ring 33a. The valve receiver 33 is formed with a ring-shaped protrusion 33c protruding toward a radially outer side of the through-hole 21a on an outer periphery thereof. The female-side valve 34 is formed in a ring shape, and the valve receiver 33 is inserted through the female-side valve 34. The female-side valve 34 is free to slide on an inner periphery of the through-hole 21a. An outer periphery of the female-side valve 34 is provided with a seal member 38, and an inner periphery of the through-hole 21a and the outer periphery of the female-side valve 34 are closed by the seal member 38. The seal member 38 is, for example, a V-shaped seal.

[0022] The female-side valve spring 35 exerts a force on the female-side valve 34 toward the protrusion 33c of the valve receiving member 33. The female-side valve seat 37 is provided on the female-side valve 34, and the female-side valve seat 37 abuts against the protrusion 33c by the force of the female-side valve spring 35. In the state where the female-side valve seat 37 abuts against the protrusion 33c, the flow path of the female mold member 20 is closed by the female-side valve seat 37. When the female-side valve 34 moves toward the direction away from the protrusion 33c against the force of the female-side valve spring 35, the female-side valve seat 37 moves away from the protrusion 33c, and the flow path of the female mold member 20 is opened.

[0023] Figure 2 is a half sectional view of the pipe joint 100, showing a state where the male mold member 10 is inserted into the female mold member 20. As shown in Figure 2 When the joint 11 is inserted into the through hole 21a, the valve receiving member 33 of the female mold member 20 contacts the male-side valve seat 17, and the male-side valve 14 is pressed in against the force of the male-side valve spring 15. As a result, the male-side valve seat 17 moves away from the protrusion 11c of the joint 11, and the flow path of the male mold member 10 is opened. In addition, the joint 11 contacts the female-side valve seat 37, and the female-side valve 34 is pressed in against the force of the female-side valve spring 35. As a result, the female-side valve seat 37 moves away from the protrusion 33c of the valve receiving member 33, and the flow path of the female mold member 20 is opened.

[0024] When the joint 11 is pulled out from the through hole 21a in the state shown in Figure 2 , the male-side valve 14 moves toward the protrusion 11c of the joint 11 by the force of the male-side valve spring 15. As a result, the male-side valve seat 17 contacts the protrusion 11c, and the flow path of the male mold member 10 is closed. In addition, the female-side valve 34 moves toward the protrusion 33c of the valve receiving member 33 by the force of the female-side valve spring 35. As a result, the female-side valve seat 37 contacts the protrusion 33c, and the flow path of the female mold member 20 is closed.

[0025] Thus, in the pipe joint 100, the flow paths in the male mold member 10 and the female mold member 20 are closed in the state where the male mold member 10 is not inserted into the female mold member 20, and the flow paths in the male mold member 10 and the female mold member 20 are opened in the state where the male mold member 10 is inserted into the female mold member 20. Therefore, by inserting and pulling out the male mold member 10 with respect to the female mold member 20, it is possible to switch between opening and closing of the flow paths, and it is possible to simply connect the pipes not shown to each other without leakage of fluid.

[0026] As shown in Figure 1As shown, a ball hole 21b is formed in the coupling body 21 through between the inner periphery and the outer periphery of the coupling body 21, and a ball 25 is disposed in the ball hole 21b. In the ball hole 21b, the opening of the outer periphery side of the coupling body 21 is larger than the diameter of the ball 25, and the opening of the inner periphery side of the coupling body 21 is smaller than the diameter of the ball 25. Therefore, only a part of the ball 25 can enter the through hole 21a of the coupling body 21 from the ball hole 21b. In a state where the ball 25 does not enter the through hole 21a of the coupling body 21 from the ball hole 21b, the ball 25 protrudes from the outer periphery of the coupling body 21.

[0027] The inner periphery of the coupling body 21 is provided with an inner periphery sleeve 26 and an inner periphery spring 27. The inner periphery sleeve 26 is movable along the central axis of the through hole 21a. The inner periphery spring 27 is supported by a stepped portion formed in the inner periphery of the coupling body 21, and exerts a force on the inner periphery sleeve 26 toward the side opposite to the side of the female-side adapter 22. In a state where the inner periphery sleeve 26 blocks the ball hole 21b, the inner periphery sleeve 26 restricts the ball 25 from entering the through hole 21a of the coupling body 21 from the ball hole 21b. When the inner periphery sleeve 26 moves against the force of the inner periphery spring 27, the inner periphery sleeve 26 opens the ball hole 21b, so that a part of the ball 25 can enter the through hole 21a of the coupling body 21 from the ball hole 21b.

[0028] The outer periphery of the coupling body 21 is provided with an outer periphery sleeve 28 and an outer periphery spring 29. The outer periphery sleeve 28 is movable along the central axis of the through hole 21a. The outer periphery spring 29 is supported by a stepped portion formed in the outer periphery of the coupling body 21, and exerts a force on the outer periphery sleeve 28 toward the side opposite to the side of the female-side adapter 22.

[0029] A ring-shaped recess 28a that can receive the ball 25 is formed in the inner periphery of the outer periphery sleeve 28. The ring-shaped recess 28a has an inclined surface that converts the force of the outer periphery spring 29, and functions as a force that presses the ball 25 into the through hole 21a of the coupling body 21. In Figure 1 In the state shown, the ball 25 is in contact with the inclined surface. When the inner periphery sleeve 26 moves against the force of the inner periphery spring 27 and opens the ball hole 21b, the outer periphery sleeve 28 moves by the force of the outer periphery spring 29, and presses the ball 25 into the through hole 21a of the coupling body 21. Thus, a part of the ball 25 enters the through hole 21a of the coupling body 21 from the ball hole 21b.

[0030] As Figure 2When the joint 11 is inserted into the through-hole 21a until the annular groove lib of the joint 11 is continuous with the ball hole 21b, the inner peripheral sleeve 26 moves against the force of the inner peripheral spring 27 to open the ball hole 21b, so that the ball 25 can enter the annular groove lib from the ball hole 21b. At this time, the outer peripheral sleeve 28 moves under the force of the outer peripheral spring 29, and presses the ball 25 into the through-hole 21a of the coupler body 21. As a result, a part of the ball 25 enters the annular groove lib from the ball hole 21b, and the movement of the joint 11 toward the direction of pulling out from the coupler body 21 is locked. Therefore, it is possible to prevent the male mold member 10 from being detached from the female mold member 20.

[0031] In Figure 2 In the state shown, the movement of the outer peripheral sleeve 28 toward the direction of the female-side adapter 22 is not locked. Therefore, in the case where the male mold member 10 and the female mold member 20 are loosened and the elasticity of the sealing member 24 is small at low temperature, fluid leakage can occur. In addition, due to the vibration of the male mold member 10 and the female mold member 20, the outer peripheral sleeve 28 can slightly move, which can cause seizure at the contact portion between the inner surface of the outer peripheral sleeve 28 and the ball 25.

[0032] Therefore, in the pipe joint 100, the outer peripheral sleeve 28 is configured to be lockable. Specifically, the female mold member 20 includes a locking sleeve 31 that is screwed with an outer thread portion 21c formed on the outer periphery of the coupler body 21. The locking sleeve 31 moves along the central axis of the through-hole 21a of the coupler body 21 by rotating around the central axis of the through-hole 21a. When the locking sleeve 31 moves to contact the outer peripheral sleeve 28, the locking sleeve 31 locks the movement of the outer peripheral sleeve 28 in the direction toward the female-side adapter 22.

[0033] Figure 3 is a half sectional view of the pipe joint 100, showing the state where the locking sleeve 31 is moved to contact the outer peripheral sleeve 28. Figure 2 is a half sectional view of the pipe joint 100, showing the state where the locking sleeve 31 is moved to contact the outer peripheral sleeve 28. Figure 3 In the state shown, the locking sleeve 31 contacts the outer peripheral sleeve 28, and locks the movement of the outer peripheral sleeve 28 in the direction toward the female-side adapter 22. Therefore, it is possible to prevent the loosening of the male mold member 10 and the female mold member 20, and to prevent fluid leakage even if the elasticity of the sealing member 24 is small at low temperature. In addition, it is possible to prevent the slight movement of the outer peripheral sleeve 28, and to prevent seizure at the contact portion between the inner surface of the outer peripheral sleeve 28 and the ball 25.

[0034] To release the lock of the ball 25 onto the connector 11, firstly, the locking sleeve 31 is rotated in the opposite direction, causing it to disengage from the outer peripheral sleeve 28. This allows the outer peripheral sleeve 28 to move. Then, the outer peripheral sleeve 28 is moved towards the female adapter 22 against the force of the outer peripheral spring 29, making the annular recess 28a of the outer peripheral sleeve 28 capable of receiving the ball 25. Thus, the ball 25 can move from the annular groove 11b of the connector 11, and the lock of the ball 25 onto the connector 11 is released.

[0035] Figure 4 yes Figure 3 An enlarged view of part A is shown. (See attached image.) Figure 4 As shown, the female adapter 22 is screwed into the external thread 21c of the locking sleeve 31 until it contacts the female valve stop 36, and then tightened onto the connector body 21. Therefore, when the ball 25 is released from the locking of the connector 11, the locking sleeve 31 only moves until it contacts the female adapter 22. Thus, the locking sleeve 31 is prevented from detaching from the connector body 21.

[0036] In this way, the female adapter 22 is fastened to the connector body 21 by engaging with the external thread 21c, and the locking sleeve 31 is prevented from falling off. Therefore, it is not necessary to provide a radially outward protruding flange on the connector body 21 to prevent the locking sleeve 31 from falling off. In addition, since the connector body 21 does not have a flange, the length of the flange 21 does not need to be considered, thus reducing the overall length. Therefore, the overall length and outer diameter of the connector body 21 can be reduced, and the falling off of the locking sleeve 31 can be prevented.

[0037] The female adapter 22 has an internal thread portion 22c that engages with the external thread portion 21c and a sealing receiving portion 22d that accommodates the sealing member 23. Specifically, the sealing receiving portion 22d is an annular recess formed on the inner circumference of the through hole 22a.

[0038] In the absence of a flange on the connector body 21 to prevent the locking sleeve 31 from falling off, it is assumed that the sealing receiving portion 22d is positioned relative to the internal thread portion 22c on the front side of the female adapter 22. Figure 4 If the sealing component 23 is misaligned to the front side of the female adapter 22 (on the left side), the sealing component 23 may be misaligned. In this case, the sealing performance of the sealing component 23 is reduced.

[0039] In this embodiment, the sealing receiving portion 22d is disposed on the inner side of the female adapter 22 relative to the internal thread portion 22c. Figure 4The sealing member 23 is held in the inner side of the female-side adapter 22 in the state where the female thread portion 22c is screwed with the male thread portion 21c. Thus, the sealing member 23 is prevented from being damaged, and fluid leakage from between the coupling main body 21 and the female-side adapter 22 is more reliably prevented.

[0040] The outer periphery of the female-side valve stopper 36 has an inclined surface 36b inclined away from the inner periphery of the female-side adapter 22 as it advances toward the inner side of the female-side adapter 22. Thus, the sealing member 23 does not come into angular contact with the female-side valve stopper 36 when the female-side adapter 22 is fastened to the coupling main body 21. Thus, the sealing member 23 is prevented from being damaged, and fluid leakage from between the coupling main body 21 and the female-side adapter 22 is more reliably prevented. The inclined surface 36b can be linearly (tapered) inclined, or curvilinearly (with a radius) inclined.

[0041] The inner periphery of the lock sleeve 31 has a female thread portion 31c screwed with the male thread portion 21c and a non-threaded portion 31d not screwed with the male thread portion 21c. The non-threaded portion 31d extends toward the outer periphery sleeve 28. Thus, the lock sleeve 31 can be brought into contact with the outer periphery sleeve 28 even in the case where the male thread portion 21c is separated from the outer periphery sleeve 28 and the female thread portion 31c cannot access the outer periphery sleeve 28. Thus, the movement of the outer periphery sleeve 28 can be locked by the lock sleeve 31.

[0042] <Second Embodiment> Figure 5 is a half sectional view of the pipe joint 200 according to the second embodiment, showing a state where the male mold member 10 is separated from the female mold member 220. The following mainly describes the points different from the first embodiment, and the structures same as or equivalent to those described in the first embodiment are denoted by the same symbols as those in the first embodiment and the description thereof is omitted.

[0043] In the pipe joint 100 according to the first embodiment (refer to Figures 1-4 ), the flow path of the female mold member 20 is linear, whereas in the pipe joint 200 according to the second embodiment (refer to Figure 5 ), the flow path of the female mold member 220 is inclined. The through hole 222a of the female-side adapter 222 is bent at about 90 degrees, but can be bent at about 45 degrees or an angle other than that.

[0044] In such a pipe joint 200, also as in the first embodiment, the female-side adapter 222 is fastened to the coupler main body 21 by screwing with the external thread portion 21c, and the falling-off of the locking sleeve 31 is prevented. Therefore, it is not necessary to provide the flange portion protruding toward the radial outer side on the coupler main body 21 to prevent the falling-off of the locking sleeve 31. Further, since the coupler main body 21 does not have the flange portion, it is not necessary to consider the length of the flange portion 21, so that the overall length is also reduced. Therefore, it is possible to reduce the overall length and the outer diameter of the coupler main body 21, and to prevent the falling-off of the locking sleeve 31.

[0045] The position of the sealing member 23 in the female mold member 220, the shape of the female-side valve stopper 36, and the shape of the locking sleeve 31 are the same as those of the female mold member 20 of the first embodiment, so the action and effect thereof are omitted.

[0046] <Third Embodiment> Figure 6 is a half sectional view of a pipe joint 300 according to the third embodiment, showing a state in which a male mold member 310 is separated from the female mold member 20. Hereinafter, mainly the points different from the first embodiment are described, and for the structures the same as or equivalent to those described in the first embodiment, the same symbols as those of the first embodiment are marked in the drawings and the description thereof is omitted.

[0047] In the pipe joint 300 according to the third embodiment, the male mold member 310 does not include the male-side valve 14, the male-side valve spring 15, the male-side valve stopper 16, and the male-side valve seat 17 in the first embodiment, and an external thread portion for mounting a pipe not shown is formed on a joint 311. That is, the male mold member 310 is constituted only by the joint 311 having a through-hole 311a.

[0048] In such a pipe joint 300, also the same action and effect as those of the first embodiment are obtained.

[0049] Although the illustration is omitted, in a manner in which the male mold member 310 in the third embodiment is connected to the female mold member 220 in the second embodiment, also the same action and effect as those of the first embodiment are obtained.

[0050] Further, although the illustration is omitted, the female mold member 20 and the female mold member 220 can not include the valve receiver 33, the female-side valve 34, the female-side valve spring 35, the female-side valve stopper 36, and the female-side valve seat 37. Even in such a manner, if the female-side adapter 22 and the female-side adapter 222 are fastened to the coupler main body 21 by screwing with the external thread portion 21c, and the falling-off of the locking sleeve 31 is prevented, as in the first to third embodiments, it is possible to reduce the overall length and the outer diameter of the coupler main body 21, and to prevent the falling-off of the locking sleeve 31.

[0051] The above describes embodiments and modifications of the present application, but the present application is not limited to the above-described embodiments and modifications, and can be appropriately changed within the scope of the gist of the present application. Reference Signs List

[0052] 100, 200, 300: pipe joint 10, 310: male mold part 20, 220: female mold part 21: coupler body 21c: external thread part 21a: through hole 22, 222: female side adapter (adapter) 28: outer peripheral sleeve 31: locking sleeve

Claims

1. A pipe joint, wherein a male member and a female member are connected to each other, the female member includes: a coupler main body having a through hole in which the male member is inserted; an outer peripheral sleeve provided to an outer periphery of the coupler main body and movable along a central axis of the through hole; a lock sleeve engaged with an outer thread portion formed in the outer periphery of the coupler main body, moved along the central axis by rotation about the central axis, and locks the outer peripheral sleeve; and an adapter fastened to the coupler main body by engagement with the outer thread portion and prevents the lock sleeve from coming off.

2. The pipe joint of claim 1, wherein, further includes: a seal member that closes between the coupler main body and the adapter, the adapter has an inner thread portion engaged with the outer thread portion and a seal accommodation portion that accommodates the seal member, the seal accommodation portion is provided on an inner side of the adapter with respect to the inner thread portion.

3. The pipe joint of claim 2, wherein, the female member further includes: a valve that opens and closes a flow path formed by the through hole; a valve spring that applies force to the valve; and a valve stopper that is fixed to the coupler main body by fastening of the adapter and supports the valve spring, an outer periphery of the valve stopper has an inclined surface that is inclined away from an inner periphery of the adapter as it advances toward the inner side of the adapter.

4. The pipe joint according to claim 1, wherein an inner periphery of the lock sleeve has an inner thread portion engaged with the outer thread portion and a non-thread portion that cannot be engaged with the outer thread portion, the non-thread portion extends toward the outer peripheral sleeve.

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