JP2008309276A - Separation preventing structure of pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the size of a separation inhibiting structure capable of securing a high separation inhibiting function for two pipes connected with each other and allowing efficient and simple execution of disassembly work. <P>SOLUTION: A seal member for sealing the part between an outer circumferential face 2b of the end of a spigot 2 inserted and connected and the inner circumferential face 1a of a socket 1 is installed in the corner part 3 or the circumferential groove 4 formed in the back side of the inner circumferential face 1a of the socket 1 in/with which the spigot 2 is inserted/connected. The opening side inner diameter of the socket 1 is constituted in the bore to permit the separation movement of the lock ring 7 engaged with and retained in the state of inhibiting movement to the end side at least on the circumferential face of the engaging projection 2A integrally projected to the outer circumferential face 2b of the spigot 2 or the outer circumference face of the spigot 2. Furthermore, the separation preventing means A to prevent the separation movement of the spigot 2 to the socket 1 is provided removably with the socket 1 by abutting on the engaging projection 2A or the lock ring 7 from the opening side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a structure for preventing separation of a pipe joint part for preventing a receiving pipe part and an insertion pipe part inserted and connected thereto from being detached and moved by an external force caused by an earthquake or unequal subsidence.

  In the conventional pipe joint part detachment preventing structure, the outer peripheral surface on the distal end side of the insertion tube part and the reception tube part are disposed on the inner side of the inner periphery surface of the reception tube part to which the insertion tube part is inserted and connected. An annular groove having a width that is at least twice as long as the length in the tube axis direction of the sealing material that seals between the inner peripheral surface of the annular groove is formed, and the opening side end surface of the annular groove is formed into a tapered surface that has a smaller diameter toward the opening side. The sealing material is tapered between the rear end surface of the sealing material and the inner end surface of the annular groove that is mounted between the tapered surface and the outer peripheral surface on the distal end side of the insertion tube portion. A push ring provided with a connecting rod and a bolt to be pressed to the side is provided, and a spacer is interposed between the rear end face of the push ring and the rear end face of the annular groove.

  Further, a portion of the outer peripheral surface of the insertion tube portion that is biased toward the opening side of the receiving tube portion with respect to the sealing position by the sealing material is larger in diameter than the minimum inner diameter portion of the tapered surface, and A ring-shaped locking projection having a smaller diameter than the inner diameter of the opening-side inner peripheral surface of the receiving tube portion is integrally formed, and the smallest inner diameter portion of the tapered surface of the inner peripheral surface of the receiving tube portion The circumferential groove formed in the portion biased toward the opening side is closer to the locking projection from the opening side, thereby preventing the detachment movement of the insertion tube portion with respect to the receiving tube portion. A C-shaped lock ring was attached, and set bolts for pressing and deforming a plurality of circumferential locations of the lock ring toward the reduced diameter side were screwed and attached from the outer peripheral surface side of the receiving pipe portion (for example, , See Patent Document 1).

JP 2003-287169 A

  In the conventional structure for preventing the pipe joint from coming off, the lock ring mounted in the circumferential groove of the receiving pipe part and the locking projection of the insertion pipe part are contacted from the axial direction of the pipe, thereby causing an earthquake or inconsistency. While being able to strongly prevent the relative separation movement between the receiving tube portion and the insertion tube portion against the pulling external force generated due to settlement or the like, the receiving tube portion and the insertion tube When releasing the connection to the receiving part, the bolt is loosened and the lock ring is expanded to the disengaged position by the elastic restoring force, so that the insertion tube part is more efficient than the receiving pipe part. It can be pulled out well and easily.

  However, since it is necessary to install a sealing material, a push ring provided with a connecting rod and a bolt, and a spacer from the inside of the pipe in the annular groove of the receiving pipe portion, not only the assembly work becomes complicated, but also the sealing material Between the rear end face of the annular groove and the rear end face of the annular groove, a space for arranging a pusher wheel having a connecting rod and a bolt for pressing the sealing material toward the tapered surface side must be secured. There is an inconvenience that the structure for preventing detachment of the joint portion tends to increase in size in the tube axis direction.

  The present invention has been made in view of the above circumstances, and its main problem is to ensure a high detachment prevention function of both connected pipe parts and to easily and efficiently disassemble them. However, the present invention is to provide a structure for preventing the detachment of the pipe joint part, which can improve the efficiency and ease of the assembling work and make the detachment prevention structure compact.

  According to a first characteristic configuration of the present invention, the insertion tube is inserted and connected to a corner portion or a circumferential groove portion formed on the inner side of the inner peripheral surface of the receiving tube portion to which the insertion tube portion is inserted and connected. A sealing material that seals between the outer peripheral surface of the distal end portion of the portion and the inner peripheral surface of the receiving tube portion is attached, and the opening-side inner diameter of the receiving tube portion is set to the outer peripheral surface of the insertion tube portion. It is configured to have an inner diameter that allows the locking ring that is engaged and held to be disengaged at least at the distal end side against the outer peripheral surface of the locking projection formed integrally projecting or the insertion tube portion. Further, the detachment preventing means for preventing the detachment movement of the insertion tube portion with respect to the receiving tube portion by contacting the receiving tube portion with the locking projection or the lock ring from the opening side. Is provided in a detachable manner.

  According to the above characteristic configuration, after the sealing material is attached to the entrance corner or the circumferential groove formed on the back side of the inner peripheral surface of the receiving tube portion, the insertion tube portion is connected to the receiving tube portion. When the plug connection is made, the inner diameter of the receiving tube portion is a locking projection formed integrally protruding on the outer peripheral surface of the insertion tube portion or a lock ring engaged and held on the outer peripheral surface of the insertion tube portion. Since it is configured to have a larger diameter than the outer diameter, the insertion tube portion can be easily inserted to a predetermined connection position in the reception tube portion, and in this state, the insertion tube portion The sealing material can be compressed in a sealed state on the outer peripheral surface of the tip portion.

  After that, even if a pulling-out external force acts due to an earthquake or non-uniform subsidence by the detachment preventing means attached to the receiving pipe portion, the detachment preventing means contacts the locking protrusion or the lock ring from the opening side. Accordingly, it is possible to strongly prevent detachment movement of the insertion tube portion with respect to the receiving tube portion.

  Therefore, it is possible to work from the outside of the pipe except that a sealing material is attached to the entrance corner part or the circumferential groove part formed on the back side of the inner peripheral surface of the receiving pipe part, and the insertion pipe Since the sealing material is compressed in a sealed state between the outer peripheral surface of the tip of the part and the inner corner or the peripheral groove formed on the inner side of the inner peripheral surface of the receiving pipe part, the inner side of the sealing material There is no need to secure a special installation space, and it is possible to ensure a high separation prevention function for both connected pipe parts, and to disassemble efficiently and easily, while improving the efficiency and ease of assembly work. In addition, it is possible to make the separation prevention structure compact.

  According to a second characteristic configuration of the present invention, the distal end surface of the insertion tube portion can be contacted from the tube axis direction on the back side of the inner peripheral surface of the reception tube portion to which the insertion tube portion is inserted and connected. An annular wall surface is formed, and an outer peripheral surface of the distal end portion of the insertion tube portion inserted into and connected to a corner portion or a circumferential groove portion formed by the annular wall surface and an inner peripheral surface of the reception tube portion and the receiving portion. A locking projection that is fitted with a sealing material that seals between the inner peripheral surface of the mouth tube portion, and the opening-side inner diameter of the receiving tube portion is integrally projected on the outer peripheral surface of the insertion tube portion Or an inner diameter that allows disengagement of the lock ring that is engaged and held in a state in which movement to at least the distal end side is prevented from coming into contact with the outer peripheral surface of the insertion tube portion; The detachment movement of the insertion tube portion with respect to the receiving tube portion is prevented by contacting the locking protrusion or the lock ring from the opening side. Detachment preventing means is in the point that provided detachably.

  According to the above characteristic configuration, after the sealing material is attached to the entrance corner or the circumferential groove formed on the back side of the inner peripheral surface of the receiving tube portion, the insertion tube portion is connected to the receiving tube portion. When the plug connection is made, the inner diameter of the receiving tube portion is a locking projection formed integrally protruding on the outer peripheral surface of the insertion tube portion or a lock ring engaged and held on the outer peripheral surface of the insertion tube portion. Since it is configured to have a larger diameter than the outer diameter, it is easy to reach a predetermined connection position in which the distal end surface of the insertion tube portion is brought into contact with or close to the annular wall surface in the receiving tube portion from the tube axis direction. In this state, the sealing material can be reliably compressed in a sealed state on the outer peripheral surface of the distal end portion of the insertion tube portion.

  After that, even if a pulling-out external force acts due to an earthquake or non-uniform subsidence by the detachment preventing means attached to the receiving pipe portion, the detachment preventing means contacts the locking protrusion or the lock ring from the opening side. In addition, the detachment movement of the insertion tube portion with respect to the reception tube portion can be strongly prevented, and the relative contraction movement between the reception tube portion and the insertion tube portion is also caused by the insertion tube portion. It is possible to strongly prevent the contact between the tip surface of the tube and the annular wall surface in the receiving tube portion from the tube axis direction.

  Therefore, it is possible to work from the outside of the pipe except that a sealing material is attached to the entrance corner part or the circumferential groove part formed on the back side of the inner peripheral surface of the receiving pipe part, and the insertion pipe Since the sealing material is compressed in a sealed state between the outer peripheral surface of the tip of the part and the inner corner or the peripheral groove formed on the inner side of the inner peripheral surface of the receiving pipe part, the inner side of the sealing material It is not necessary to secure a special installation space, secures a high separation prevention function and shrinkage prevention function for both connected pipe parts, and can be easily and efficiently disassembled, but the efficiency of assembly work And facilitating and downsizing of the structure for preventing detachment can be achieved.

  A third characteristic configuration according to the present invention lies in that a tapered surface having a smaller diameter is formed at a distal end portion of the outer peripheral surface of the insertion tube portion so that the distal end side presses the sealing material in a sealed state.

  According to the above characteristic configuration, when the insertion tube portion is easily inserted to a predetermined connection position in the reception tube portion, the reception tube is formed by the tapered surface formed at the distal end portion of the outer peripheral surface of the insertion tube portion. It is possible to reliably and smoothly compress the sealing material mounted in the corners or circumferential grooves of the portion to the sealed state.

  According to a fourth characteristic configuration of the present invention, the locking projection is formed to protrude from the distal end portion of the outer peripheral surface of the insertion tube portion, and the sealing material is pressed in a sealed state on the outer peripheral surface of the locking projection. A taper surface having a smaller diameter toward the leading end side is formed.

  According to the above characteristic configuration, the protrusion margin in the radial direction of the locking projection on the side of the insertion tube portion that prevents the separation by contacting the separation prevention means attached to the receiving tube portion from the tube axis direction. Utilizing the tapered surface for compressing the sealing material in a sealed state between the entrance corner portion or the circumferential groove portion formed on the inner side of the inner peripheral surface of the receiving pipe portion, the inclination angle with the highest compression effect Can be configured long.

  According to a fifth feature of the present invention, the distal end of the insertion tube portion is engaged with the annular wall surface of the receiving tube portion from the tube axis direction, and the relative movement in the tube diameter direction of both tube portions is achieved. This is in that a recess is formed that prevents or restricts within a certain range.

  According to the above characteristic configuration, in a predetermined connection state in which the distal end surface of the insertion tube portion is in contact with or close to the annular wall surface in the reception tube portion from the tube axis direction, the distal end of the insertion tube portion is the receiving tube. Because it is engaged in a recess formed in the annular wall surface of the mouth pipe, it is possible to prevent or restrict the bending of both pipe parts due to the non-average force generated in the pipe line to the set minimum fixed range. It is possible to suppress adverse effects on the bolts and the like of the pipe joint portion.

  A sixth characteristic configuration according to the present invention is that the attachment / detachment operation portion of the separation preventing means is provided at a portion facing the outside of the receiving tube portion.

  According to the above characteristic configuration, the detachment operation of the detachment preventing means with respect to the receiving tube portion can be efficiently and easily performed in a wide space outside the tube.

  According to a seventh characteristic configuration of the present invention, the disengagement preventing means is configured such that a push ring provided with a pressing surface against the locking protrusion or the lock ring is movable in the tube axis direction in the insertion tube portion. A fastening means is provided which is provided on the exterior and fastens and fixes the push ring and the receiving pipe portion from the tube axis direction.

  According to the above characteristic configuration, when the fastening means is tightened and fixed, the engagement between the pusher wheel and the receiving tube part in the tube axis direction causes the engagement of the pushing surface on the insertion tube part side with the pressing surface of the pusher wheel. Since the stop protrusion or the lock ring can be pushed in and moved, it is possible to facilitate the connecting operation of both pipe portions.

  According to an eighth characteristic configuration of the present invention, the detachment preventing means is configured such that the insertion tube portion has a diameter larger than an inner diameter of an annular wall portion formed on a receiving opening side of the receiving tube portion. A lock member provided with a plurality of engaging portions in the circumferential direction is externally slidable in the tube axis direction and relatively rotatable around the tube axis, and the annular wall portion of the receiving tube portion Is formed with a detachable recess that allows passage of the locking portion of the locking member in the direction of the tube axis, and between the annular wall portion of the receiving tube portion and the locking protrusion or the lock ring. Is that a rotation path that allows rotation of the lock member that has been transferred into the pipe through the detachable recess is formed.

  According to the above characteristic configuration, after inserting the insertion tube portion into the predetermined connection position with respect to the receiving tube portion, the locking member sheathed on the insertion tube portion is provided with a plurality of locking portions thereof. A plurality of detachable recesses formed in the annular wall portion of the receiving tube portion are adjusted to a specific phase that matches in the tube axis direction, and in this state, the lock member is pushed into the opening side of the receiving tube portion and moved. Then, the respective locking portions of the lock member are transferred through a detachable recess of the annular wall portion into a rotation path formed between the annular wall portion and the locking projection or the lock ring, and then The lock member is rotated from the connection position to the set retaining position.

  In this state, even if a pulling force is applied to both pipe portions, the locking projection or lock ring on the side of the insertion tube portion abuts the lock member from the tube axis direction, and a plurality of lock members are locked. The portion comes into contact with the annular wall portion of the receiving tube portion from the direction of the tube axis to prevent the respective detachment movements.

  Therefore, since both the pipe parts can be secured and released by simply sliding and rotating the lock member provided on the insertion pipe part in the tube axis direction, the connection between the two pipe parts is possible. Efficiency and ease of work and dismantling work can be achieved.

  A ninth characteristic configuration according to the present invention is that a fitting recess in which a part of the push ring is fitted from the tube axis direction is formed in the opening of the receiving pipe part.

  According to the above characteristic configuration, when an external force to bend is applied to both pipe portions due to the non-average force generated in the pipe line, the push ring that contacts the locking projection or the lock ring on the side of the insertion pipe portion is radially outward. The movement component force acts on, but this movement component force can be received by the fitting concave portion formed in the opening of the receiving pipe portion and a part of the press ring fitted thereto, The intended function of preventing withdrawal can be reliably exhibited.

[First Embodiment]
FIGS. 1 to 3 show a pipe system 1 formed of a fluid pipe P such as a water pipe or a gas pipe. On the other hand, a structure for preventing the detachment of the pipe joint portion in which the insertion tube portion 2 formed with the same diameter on one end side of the other fluid pipe P made of cast iron is inserted and connected in a sealed state is shown.
The distal end surface 2a of the insertion tube portion 2 is piped at a location corresponding to the boundary between the large diameter inner circumferential surface 1a of the receiving tube portion 1 and the small diameter inner circumferential surface 1b on the intermediate tube portion side of the fluid pipe P continuous therewith. An annular annular wall surface 1c that can be contacted from the direction of the axis X is formed, and a corner 3 formed by the annular wall surface 1c and the large-diameter inner peripheral surface 1a of the receiving pipe portion 1 or a portion thereof is formed. The circumferential groove portion 4 formed in the large-diameter inner peripheral surface 1a includes a distal end side portion 2c in the outer peripheral surface 2b of the insertion tube portion 2 that is inserted and connected, and a large-diameter inner peripheral surface 1a of the receiving tube portion 1. An annular sealing material (rubber ring) 5 made of synthetic rubber that seals the gap is attached, and the opening-side inner diameter of the receiving tube portion 1 is formed on the outer peripheral surface 2b of the insertion tube portion 2. A metal lock ring 7 that is engaged and held (including fitted and held) in a state that prevents movement in the tube axis X direction against the annular locking groove 6. The inner diameter allowing the detachment movement is configured, in other words, the minimum inner diameter of the large-diameter inner peripheral surface 1a of the receiving tube portion 1 is engaged with the engaging groove portion 6 of the outer peripheral surface 2b of the inlet tube portion 2. The outer diameter of the held lock ring 7 is configured to be larger than the outer diameter, and the opening end portion of the receiving pipe portion 1 is in contact with the lock ring 7 from the opening side in the tube axis X direction. By doing so, a detachment preventing means A for preventing the detachment movement of the insertion tube portion 2 with respect to the receiving tube portion 1 is detachably provided.

  The detachment preventing means A includes a pressing surface 8a that can come into contact with the receiving surface 7a of the lock ring 7 from the opening side in the tube axis X direction, and the tube shaft with respect to the insertion tube portion 2 A cast iron push ring 8 which is externally movably mounted in the core X direction, and the push ring 8 and the receiving pipe part 1 are relatively positioned from the pipe axis X direction in a portion facing the outside of the receiving pipe part 1. It is comprised from the fastening means 9 as a removal | desorption operation part which clamps and fixes while pulling.

  When the tightening and fixing operation by the fastening means 9 is completed, the distal end surface 2a of the insertion tube portion 2 is brought into contact with the annular wall surface 1c of the reception tube portion 1 as shown in FIGS. The abutting corner portion of the receiving tube portion 1 is in contact with or close to the tube axis X direction, and the pressing surface 8a of the push ring 8 contacts the receiving surface 7a of the lock ring 7 from the tube axis X direction. 3 or the sealing material 5 attached to the circumferential groove portion 4 is compressed into a predetermined sealed state with the distal end side portion 2c on the outer peripheral surface 2b of the insertion tube portion 2, and in this state, the receiving port The relative expansion and contraction movement in the tube axis X direction between the tube portion 1 and the insertion tube portion 2 is prevented.

  The distal end side portion 2c of the insertion tube portion 2 is formed in a tapered surface having a smaller diameter toward the distal end side, and the minimum outer diameter of the distal end is formed to be smaller or substantially the same diameter as the minimum inner diameter of the sealing material 5. In addition, the length of the tapered surface 2 c in the tube axis direction is configured to be smaller than the length of the sealing material 5.

  In the state where the front end face 2a of the insertion tube portion 2 is in contact with the annular wall surface 1c of the receiving tube portion 1 from the tube axis X direction, the sealing material 5 Within the taper, which has a length substantially corresponding to the surface facing the lock ring 7 and which is larger than the inclination angle of the head 5A having a circular cross section formed on the distal end side and the tapered surface 2c of the insertion tube portion 2 It is comprised from the surrounding surface 5a and the trunk | drum 5B provided with the small diameter inner peripheral surface 5b which continues in parallel along the pipe axis X direction from the minimum diameter side, and the largest outer diameter of the said head 5A The portion is formed to protrude outward in the radial direction from the outer peripheral surface of the body portion 5B.

  Then, the pipe portions 1 and 2 are fitted and connected to a predetermined connection position where the distal end surface 2a of the insertion tube portion 2 contacts or approaches the annular wall surface 1c of the reception tube portion 1 from the tube axis X direction. When this is done, the sealing material 5 attached to the circumferential groove 4 in the entrance corner 3 of the receiving tube 1 is pressed and compressed smoothly and smoothly to a predetermined sealed state by the tapered surface 2c of the insertion tube 2. In this sealed state, the head portion 5a on the distal end side of the sealing material 5 is located between the outer peripheral surface 2b of the insertion tube portion 2 continuous with the tapered surface 2c and the bottom surface of the peripheral groove portion 4 of the receiving tube portion 1. It is configured to enter in a compressed state.

  The distal end of the insertion tube portion 2 is engaged with the annular wall surface 1c of the receiving tube portion 1 from the tube axis X direction to prevent relative movement in the tube diameter direction of both the tube portions 1 and 2. A concave portion 11 is formed to regulate within a certain range.

  In a predetermined connection state in which the distal end surface 2a of the insertion tube portion 2 is brought into contact with or brought close to the annular wall surface 1c in the reception tube portion 1 from the tube axis X direction, the distal end of the insertion tube portion 2 receives the reception tube. Since it is engaged in the concave portion 11 formed in the annular wall surface 1c of the mouth tube portion 1, the bending of both the tube portions 1 and 2 due to the non-average force generated in the pipeline is prevented or set within a minimum fixed range. It is possible to suppress the adverse effect on the bolts and the like of the pipe joint portion.

  The lock ring 7 is cut at one place in the circumferential direction so as to be elastically deformable on the diameter-expanded side, and the pressing surface 8a of the pusher wheel 8 is an opening side end of the receiving tube portion 1. The receiving surface 7a of the lock ring 7 is formed in a tapered surface having a smaller diameter toward the push wheel 8 side.

  Therefore, when an external force in the separation direction (withdrawal direction) acts on the insertion tube portion 2 with respect to the reception tube portion 1, against the tapered pressing surface 8 a of the press wheel 8 fixed to the reception tube portion 1. When the tapered receiving surface 7a of the lock ring 7 engaged and held in the locking groove portion 6 of the insertion tube portion 2 moves relative to the disengagement side, the lock ring 7 which can be expanded in diameter is inserted. The component force pressed against the locking groove portion 6 of the tube portion 2 is increased, and the separation preventing force between the receiving tube portion 1 and the insertion tube portion 2 can be significantly increased.

  Further, on one side surface of the pusher wheel 8 facing the opening side end of the receiving tube part 1, an annular protrusion (a part of the pusher wheel 8 is formed with the tapered pressing surface 8 on the inner peripheral surface side). An example) 8b is integrally formed to project toward the opening side end of the receiving pipe part 1, and the push ring is provided on the opening end surface 1e of the opening side end of the receiving pipe part 1. 8 annular projections 8b are fitted from the tube axis X direction to prevent relative movement in the tube radial direction between the opening-side end portion of the receiving tube portion 1 and the push wheel 8, or restricted within a certain range. A fitting recess 10 is formed.

  Then, when an external force to be bent is applied to both the pipe portions 1 and 2 due to the non-average force generated in the piping system, the push ring 8 that contacts the lock ring 7 on the insertion tube portion 2 side moves in the tube diameter direction. Although the component force acts, this moving component force is applied to the fitting concave portion 10 formed on the opening end surface 1e of the opening side end portion of the receiving pipe portion 1 and the annular projection portion 8b of the press ring 8 fitted thereto. Therefore, the intended function of preventing withdrawal can be reliably exhibited.

  As shown in FIGS. 1 to 3, the fastening means 9 includes bolt insertion holes 9 a formed at a plurality of locations in the circumferential direction of the connecting flange portion 1 d formed at the opening end of the receiving pipe portion 1, and T-shaped bolts 9A inserted across bolt insertion holes 9a, 9b facing each other in the tube axis X direction among bolt insertion holes 9b formed at a plurality of locations in the circumferential direction of the push wheel 8 at the same pitch, The nut 9B is screwed into the protruding screw portion of the bolt 9A, and the push shaft 8 and the connecting flange portion 1d of the receiving pipe portion 1 in the direction of the tube axis X in the tightening operation of the bolt 9A and nut 9B. With the relative proximity movement, the receiving tube portion 1 and the insertion tube portion 2 are held out and fixed by pressure contact between the pressing surface 8a of the push ring 8 and the receiving surface 7a of the lock ring 7.

[Second Embodiment]
In the first embodiment described above, the distal end side portion 2c of the insertion tube portion 2 is formed in a tapered surface having a smaller diameter toward the distal end side. However, as shown in FIGS. The distal end side portion 2c of the mouth tube portion 2 may be formed in a straight line with the same diameter as the outer peripheral surface 2b of another portion continuous therewith.
In this case, since the distal end side portion 2c of the insertion tube portion 2 and the bottom surface of the circumferential groove portion 4 in the entrance corner portion 3 of the reception tube portion 1 are parallel, the sealing material 5 described in the first embodiment described above. In addition to the shape, it is possible to use an O-ring type.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Third Embodiment]
FIGS. 5 (a) and 5 (b) show a modification of the second embodiment described above, and there is an intermediate position in the tube axis X direction on the bottom surface of the peripheral groove 4 in the entrance corner 3 of the receiving tube 1. In the sealing material 5 having a cross-sectional shape that is substantially oval, substantially rectangular, or a similar shape, the annular protrusion 13 that engages with the annular mounting groove 5d formed on the outer peripheral surface 5c thereof is integrated. Is formed.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment and 2nd Embodiment, the same number is attached to the same structure location as 1st Embodiment and 2nd Embodiment. The description thereof is omitted.

[Fourth Embodiment]
In each of the above-described embodiments, the lock ring 7 is engaged with the annular locking groove portion 6 formed on the outer peripheral surface 2b of the insertion tube portion 2 while preventing movement in the tube axis X direction. The holding protrusion (including fitting and holding), but as shown in FIGS. 6 (a) and 6 (b), the locking protrusion formed integrally and projecting at the distal end portion of the outer peripheral surface 2b of the insertion tube portion 2 The lock ring 7 may be engaged and held in a state in which the movement toward the distal end side of the 2A is blocked.

  In this embodiment, the opening-side inner diameter of the receiving tube portion is configured to be an inner diameter that allows the lock ring 7 engaged and held by the locking protrusion 2A of the insertion tube portion 2 to be detached, in other words, The minimum inner diameter of the large-diameter inner peripheral surface 1a of the receiving tube portion 1 is configured to be larger than the outer diameter of the lock ring 7 that is engaged with and held by the locking projection 2A of the insertion tube portion 2. The detachment of the insertion tube portion 2 with respect to the reception tube portion 1 by contacting the lock ring 7 with the opening end portion of the reception tube portion 1 from the opening side in the tube axis X direction. Detachment prevention means A for preventing movement is provided so as to be removable.

Of the outer peripheral surface of the locking projection 2A of the insertion tube portion 2, the front half side portion 2c corresponding to the seal member 5 attached to the circumferential groove portion 4 in the entrance corner portion 3 of the receiving tube portion 1 has a distal end. A tapered surface having a smaller diameter toward the side is formed, and the minimum outer diameter of the tip thereof is formed to be smaller or substantially the same diameter as the minimum inner diameter of the sealing material 5 attached to the circumferential groove portion 4. The length of the surface 2c in the tube axis direction is configured to be smaller than the length of the sealing material 5, and the second half 2d of the outer peripheral surface of the locking projection 14 is parallel along the tube axis X direction. And it is comprised larger diameter than the outer diameter of the outer peripheral surface 2b of the insertion tube part 2 connected to this latching protrusion 2A.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Fifth Embodiment]
In the above-described fourth embodiment, the locking projection 2A formed integrally and projecting at the distal end portion of the outer peripheral surface 2b of the insertion tube portion 2 is prevented from moving toward the distal end side. The lock ring 7 is engaged and held, and the lock ring 7 is brought into contact with the lock ring 7 from the opening side in the tube axis X direction to prevent the insertion tube portion 2 from moving away from the receiving tube portion 1. Although the blocking means A is detachably provided at the opening end of the receiving tube portion 1, as shown in FIGS. 7 (a) and 7 (b), the outer peripheral surface 2b of the insertion tube portion 2 is locked. The detachment preventing means A is brought into contact with the protrusion 2A from the opening side in the tube axis X direction so as to prevent the detachment movement of the insertion tube portion 2 with respect to the receiving tube portion 1. Also good.

  The detachment preventing means A includes a pressing surface 8a that can come into contact with the receiving surface 2e of the locking projection 2A of the insertion tube portion 2 from the opening side in the tube axis X direction, and the insertion tube A cast iron push ring 8 that is externally movably mounted in the tube axis X direction with respect to the portion 2, and the push ring 8 and the receiving pipe portion 1 are connected to the outside of the receiving pipe portion 1. It is comprised from the fastening means 9 as an attachment / detachment operation part which clamps and fixes, pulling relatively from the core X direction.

An annular projecting portion 8b having a pressing surface 8a of the pusher wheel 8 is fitted to the opening end surface 1e of the opening-side end portion of the receiving tube portion 1 from the tube axis X direction. A fitting recess 10 is formed to prevent relative movement in the tube radial direction between the opening side end of the pressing wheel 8 and the pressing wheel 8 or to restrict it within a certain range. A tapered guide surface 10a for fitting and guiding the annular protrusion 8b is formed.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Sixth Embodiment]
In the above-described fourth embodiment, the disengagement preventing means A includes a pressing surface 8a that can contact the receiving surface 7a of the lock ring 7 from the opening side in the tube axis X direction, and the insertion port A cast iron push ring 8 which is externally mounted so as to be movable in the direction of the tube axis X with respect to the pipe portion 2, and the push ring 8 and the receiving pipe portion 1 are piped at a portion facing the outside of the receiving pipe portion 1. The fastening means 9 as a detaching operation portion that is fastened and fixed while being relatively pulled from the axis X direction is configured as shown in FIGS. 8 to 10, and the detachment preventing means A is configured as follows. May be.

  Of the inner peripheral surface 1a of the receiving tube portion 1, a locking projection of the insertion tube portion 2 is formed at a portion biased to the receiving side with respect to the circumferential groove portion 4 in the corner 3 of the receiving tube portion 1. An annular stopper wall 16 is integrally formed to restrict the maximum insertion position of the lock member 15 that can be brought into contact with the lock ring 7 engaged and held at 2A from the opening side in the tube axis X direction. At the receiving end of the inner peripheral surface 1a of the receiving tube portion 1, it protrudes radially inward with an inner diameter through which the locking projection 2A and the lock ring 7 of the insertion tube portion 2 can pass. An annular wall portion 17 is integrally formed.

  Further, a portion of the inner peripheral surface of the receiving pipe portion 1 that is located between the stopper wall portion 16 and the annular wall portion 17 has an inner diameter larger than the inner diameter of the annular wall portion 17 and is on the receiving side. And a ring ring 17 of the receiving tube portion 1 and a lock ring 7 on the insertion tube portion 2 side inserted into the insertion connecting position in the receiving tube portion 1. In between, the lock member 15 made of cast iron or steel capable of coming into contact with the other side surface of the lock ring 7 from the direction of the tube axis X is freely rotatable around the tube axis X and the tube axis. It is provided to be movable in the core X direction.

  The lock member 15 is connected to a plurality of locations in the circumferential direction (4 locations in the circumferential direction in the present embodiment) by contacting the inner surface of the annular wall portion 17 of the receiving tube portion 1 from the tube axis X direction. A locking portion 15a for preventing relative movement of the tube portions 1 and 2 is integrally formed so as to protrude from the annular wall portion 17 of the receiving tube portion 1. A detachable recess 19 is formed to allow the insertion and removal movement in the tube axis X direction.

  Therefore, when connecting the receiving tube portion 1 and the inserting tube portion 2, the engaging protrusion 2 </ b> A and the lock ring 7 of the inserting tube portion 2 pass through the annular wall portion 17 of the receiving tube portion 1 and enter the tube. The locking member 15 is inserted to a predetermined connection position and is externally mounted on the insertion tube portion 2 so as to be rotatable and movable in the tube axis X direction. It adjusts to the specific phase which agree | coincides with the tube axis X direction with respect to the removal | desorption recessed part 19 formed in the annular wall part 17, and pushes the lock member 15 in the receiving pipe part 1 in this state, and locks After each locking portion 15a of the member 15 is positioned between the annular wall portion 17 of the receiving tube portion 1 and the lock ring 7 on the insertion tube portion 2 side at the insertion connection position through the detachable recess 19, The inner surface of the annular wall 17 around the tube axis X from the detachment operation position corresponding to the recess 19 for detaching the lock member 15; Mari, operated to rotate the predetermined attachment position corresponding to the retaining inner surface of each retainer wall portion 17A which is located between adjacent desorption recess 19.

  In this state, each locking portion 15a of the lock member 15 and the retaining inner surface of each retaining wall portion 17A of the receiving tube portion 1 are opposed to each other in the tube axis X direction. As a result, when a pulling force is applied to both the tube portions 1 and 2, the lock ring 7 engaged and held in the insertion tube portion 2 abuts against the lock member 15 from the tube axis X direction, Each locking portion 15a of the lock member 15 abuts against the retaining inner surface of each retaining wall portion 17A of the receiving tube portion 1 from the direction of the tube axis X, so that the relative detachment movement of both the tube portions 1 and 2 occurs. Is strongly blocked.

  Further, the lock member 15 is integrally formed with an extending portion 15b extending outside the tube through between the inner peripheral surface of the annular wall portion 17 of the receiving tube portion 1 and the outer peripheral surface of the insertion tube portion 2. Of the extended portion 15 b of the lock member 15, a portion that protrudes to the outside of the receiving tube portion 1 and the outer surface of the annular wall portion 17 of the receiving tube portion 1 correspond to the detachable recess 19. The locking portions 15a of the lock member 15 rotated from the detaching operation position to the predetermined mounting positions corresponding to the inner surfaces of the retaining wall portions 17A of the annular wall portion 17 around the tube axis X are connected to the annular wall portion 17. An elastic urging body 20 made of an annular synthetic rubber that moves and urges the inner wall of each retaining wall portion 17A is detachably mounted.

  The lock member 15 is composed of split lock pieces 15A and 15B which are divided into two along the outer peripheral surface 2b of the insertion tube portion 2 in the circumferential direction so as to be freely packaged, and each split lock piece 15A and 15B has a receiving port. One or a plurality of locking portions 15 a that can be inserted into the circumferential groove 18 through the detachable recess 19 of the tube portion 1, the inside of the annular wall portion 17 of the receiving tube portion 1, and the inside of the elastic biasing body 20, and outside the tube. A semi-cylindrical extending portion 15b is integrally formed, and a plurality of circumferentially projecting portions 15c projecting radially outward are integrally formed at the projecting end portion of the extending portion 15b. The receiving surface 15e of the projection 15c is formed as an inclined surface that is further away from the outer surface of the annular wall portion 17 of the receiving tube portion 1 toward the outer side in the radial direction.

  Therefore, the elastic urging body 20 is elastically applied to the mounting recess 21 that appears between the inclined receiving surfaces 15e of the split lock pieces 15A and 15B and the outer surface of the annular wall portion 17 of the receiving pipe portion 1. When mounted in a state where the diameter is increased against the restoring force, the elastic biasing force toward the reduced diameter side of the elastic urging body 20 is used to lock each locking portion of the lock member 15 that is rotated to a predetermined mounting position. Since 15a can be efficiently converted as an urging force for abutting the inner surface of the annular wall portion 17 of the receiving pipe portion 1, each locking portion 15a of the lock member 15 is favorably maintained at a predetermined mounting position. Can do.

As shown in FIG. 9 (b), the elastic biasing body 20 is annularly attached to the projections 15c of the split lock pieces 15A and 15B from the outside in the radial direction, as shown in FIG. A recess 20a is formed, and the annular mounting recess 20a of the elastic biasing body 20 is fitted and mounted on the projection 15c of both split lock pieces 15A and 15B, whereby the split lock pieces 15A and 15B are annular. It is configured to maintain its shape.
In addition, when the locking portion 15a of the lock member 15 is inserted into the receiving tube portion 1 through the detachable recess 19 and is rotated from its detachment operation position to a predetermined mounting position, the both splits are made. The elastic urging body 20 fitted and attached to the protrusion 15c of the lock pieces 15A and 15B is shifted to the annular wall 17 side of the receiving pipe portion 1 while expanding the diameter against the elastic urging force, and the protrusion It mounts | wears with the mounting | wearing recessed part 21, sliding along the receiving surface 15e of the part 15c.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

  Moreover, in the said 6th Embodiment, when the latching | locking part 15a of the lock member 15 inserted in the receptacle pipe part 1 through the said attachment / detachment recessed part 19 is rotated to the predetermined mounting position, from the rotation operation path | route. In addition, the engaging portion 15a of the locking member 15 can be received at a position where it enters the withdrawal side in the tube axis X direction, and at the receiving position, the engaging portion 15a of the locking member 15 is rotated toward the attaching / detaching operation position. Return regulating means for preventing movement or imparting resistance to rotation, and each locking portion 15a of the lock member 15 inserted into the detachment operation position through the detachment recess 19 of the receiving tube portion 1 along the rotation path. When turning to the predetermined mounting position, a rotation restricting means may be provided to prevent further rotation operation and hold it at the predetermined mounting position.

  Further, the lock ring 7 and the seal material 5 are set in a pressure contact state from the tube axis X direction, and the elastic restoring force of the seal material 5 is applied to the lock member 15 via the lock ring 7. The elastic restoring force of the seal member 5 is used as an urging force for applying each locking portion 15a of the lock member 15 rotated to a predetermined mounting position to the inner surface of the annular wall portion 17 of the receiving tube portion 1. May be.

[Other Embodiments]
(1) In each of the above-described embodiments, the insertion tube portion 1 is inserted at a position corresponding to the boundary between the large-diameter inner peripheral surface 1a of the receiving pipe portion 1 and the small-diameter inner peripheral surface 1b on the intermediate pipe portion side of the fluid pipe P continuous therewith. The front end surface 2a of the mouth tube portion 2 is formed with an annular annular wall surface 1c that can be contacted from the tube axis X direction. You may apply.

(2) In each of the above-described embodiments, the sealing material 5 is formed on the large-diameter inner peripheral surface 1a of the corner 3 formed by the annular wall surface 1c and the large-diameter inner peripheral surface 1a of the receiving pipe portion 1. Although the circumferential groove portion 4 for attaching the sealing material 5 is formed, the sealing material 5 may be directly attached to the corner 3 without forming the circumferential groove portion 4.
In this case, a protrusion for restricting or preventing the displacement movement of the attached sealing material 5 in the tube axis X direction may be formed on the large-diameter inner peripheral surface 1a of the corner 3.

(3) In the sixth embodiment described above, the removable recess 19 that allows the annular wall 17 of the receiving tube 1 to pass through in the tube axis X direction of the locking portion 15a of the lock member 15. A rotation path is formed between the annular wall portion 17 of the receiving tube portion 1 and the lock ring 7 to permit the rotation of the lock member 15 transferred into the tube through the demounting recess 19. However, the present invention may be applied to a structure for preventing separation of a pipe joint portion that does not include the lock ring 7.
In this case, the rotation of the lock member 15 transferred into the tube through the demounting recess 19 between the locking projection 2A formed integrally with the insertion tube portion 2 and the annular wall portion 17 of the reception tube portion 1. A rotation path that allows movement is formed.

The half cross-section side view which shows 1st Embodiment of the detachment | leave prevention structure of the pipe joint part by this invention (A) is an enlarged cross-sectional side view of the main part, (b) is an enlarged cross-sectional side view of the main part at the time of disassembly Exploded perspective view of the main part 2 shows a second embodiment of the pipe joint part detachment preventing structure according to the present invention, (A) is an enlarged cross-sectional side view of the main part, and (B) is an enlarged cross-sectional side view of the main part at the time of disassembly. 3 shows a third embodiment of the pipe joint part detachment preventing structure according to the present invention, in which (A) is an enlarged cross-sectional side view of the main part, and (B) is an enlarged cross-sectional side view of the main part during disassembly. 4 shows a fourth embodiment of the pipe joint part detachment preventing structure according to the present invention, in which (A) is an enlarged cross-sectional side view of the main part, and (B) is an enlarged cross-sectional side view of the main part during disassembly. 5 shows a fifth embodiment of the pipe joint part detachment preventing structure according to the present invention, (A) is an enlarged cross-sectional side view of the main part, and (B) is an enlarged cross-sectional side view of the main part at the time of disassembly. The half cross-section side view which shows 6th Embodiment of the separation prevention structure of the pipe joint part by this invention (A) is an enlarged cross-sectional side view of the main part, (b) is an enlarged cross-sectional side view of the main part at the time of disassembly Exploded perspective view of the main part

Explanation of symbols

A Detachment prevention means X Tube core 1 Receiving tube portion 1a Inner peripheral surface (large-diameter inner peripheral surface)
1c Annular wall surface 2 Insertion tube portion 2A Locking projection 2a Tip surface 2b Outer peripheral surface 2c Tip side portion (front half side portion, taper surface)
3 Corners 4 Circumferential groove 5 Sealing material 6 Locking groove 7 Lock ring 8 Push ring 8a Pressing surface 9 Fastening means 10 Fitting recess 11 Recess 15 Lock member 15a Locking portion 16 Stopper wall 17 Annular wall 18 Circumferential groove 19 Detachable recess

Claims (9)

  The outer peripheral surface of the distal end portion of the insertion tube portion inserted and connected to the inner groove portion or the circumferential groove portion formed on the back side of the inner peripheral surface of the reception tube portion to which the insertion tube portion is inserted and connected, and the receiving portion. A locking projection that is fitted with a sealing material that seals between the inner peripheral surface of the mouth tube portion, and the opening-side inner diameter of the receiving tube portion is integrally projected on the outer peripheral surface of the insertion tube portion Or an inner diameter that allows disengagement of the lock ring that is engaged and held in a state in which movement to at least the distal end side is prevented from coming into contact with the outer peripheral surface of the insertion tube portion; The pipe joint is provided with a detachment prevention means that prevents the detachment movement of the insertion pipe part from the receiving pipe part by coming into contact with the locking projection or the lock ring from the opening side. Departure prevention structure.   An annular wall surface is formed on the back side of the inner peripheral surface of the receiving tube portion to which the insertion tube portion is inserted and connected, so that the distal end surface of the insertion tube portion can contact from the tube axis direction. Between the outer peripheral surface of the distal end portion of the insertion tube portion and the inner peripheral surface of the reception tube portion inserted and connected to the entrance corner portion or the circumferential groove portion formed by the inner peripheral surface of the reception tube portion. A sealing material for sealing is installed, and the inner diameter on the opening side of the receiving tube portion is formed on a locking projection integrally formed on the outer peripheral surface of the insertion tube portion or on the outer peripheral surface of the insertion tube portion. The lock ring is configured to have an inner diameter that allows disengagement and movement of the lock ring that is engaged and held in a state that prevents contact with at least the distal end side. By making contact from the opening side, detachment preventing means for preventing detachment movement of the insertion tube portion with respect to the receiving tube portion can be detached. Separation preventive structure of the pipe joint being eclipsed.   3. A pipe joint portion detachment preventing structure according to claim 1 or 2, wherein a tapered surface having a smaller diameter is formed at a distal end portion of the outer peripheral surface of the insertion tube portion, the distal end side pressing the sealing material in a sealed state. .   The locking projection is formed to protrude from the distal end portion of the outer peripheral surface of the insertion tube portion, and the outer peripheral surface of the locking projection has a tapered surface having a smaller diameter toward the distal end side that presses the sealing material in a sealed state. The separation preventing structure for a pipe joint according to any one of claims 1 to 3, which is formed.   A recess in which the distal end of the insertion tube portion is engaged from the tube axis direction to prevent relative movement in the tube diameter direction of the both tube portions or to be restricted within a certain range on the annular wall surface of the receiving tube portion. 3. A structure for preventing separation of a pipe joint according to claim 2, wherein:   The detachment prevention structure for a pipe joint part according to any one of claims 1 to 5, wherein the detachment operation part of the detachment prevention means is provided at a part facing the outside of the receiving pipe part.   To constitute the disengagement prevention means, a push ring having a pressing surface for the locking projection or the lock ring is externally mounted on the insertion tube portion so as to be movable in the tube axis direction, and the push ring and the receiving tube. The pipe joint part detachment preventing structure according to any one of claims 1 to 6, wherein fastening means for fastening and fixing the part from the pipe axis direction is provided.   To constitute the detachment preventing means, the insertion tube portion has a plurality of locking portions in the circumferential direction having a diameter larger than the inner diameter of the annular wall portion formed on the receiving opening side of the receiving tube portion. The lock member provided in the outer wall is slidable in the tube axis direction and is relatively rotatable around the tube axis, and the locking wall of the lock member is provided on the annular wall portion of the receiving tube portion. A detachable recess that allows passage movement in the tube axis direction of the tube is formed, and is transferred into the pipe through the detachable recess between the annular wall portion of the receiving tube portion and the locking projection or the lock ring. The pipe joint part detachment preventing structure according to any one of claims 1 to 6, wherein a rotation path that allows rotation of the lock member is formed.   8. The structure for preventing a pipe joint from being detached according to claim 7, wherein a fitting recess into which a part of the push ring is fitted from the tube axis direction is formed in the opening of the receiving pipe.

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