WO2023120214A1 - 管継手および管の接合方法 - Google Patents
管継手および管の接合方法 Download PDFInfo
- Publication number
- WO2023120214A1 WO2023120214A1 PCT/JP2022/045316 JP2022045316W WO2023120214A1 WO 2023120214 A1 WO2023120214 A1 WO 2023120214A1 JP 2022045316 W JP2022045316 W JP 2022045316W WO 2023120214 A1 WO2023120214 A1 WO 2023120214A1
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- WO
- WIPO (PCT)
- Prior art keywords
- lock ring
- socket
- diameter
- detachment
- tool
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 31
- 238000003780 insertion Methods 0.000 claims description 107
- 230000037431 insertion Effects 0.000 claims description 107
- 230000002265 prevention Effects 0.000 claims description 42
- 230000002093 peripheral effect Effects 0.000 claims description 39
- 238000012423 maintenance Methods 0.000 claims description 20
- 230000004308 accommodation Effects 0.000 claims description 12
- 238000000926 separation method Methods 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- 238000003825 pressing Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L21/00—Joints with sleeve or socket
- F16L21/08—Joints with sleeve or socket with additional locking means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L27/00—Adjustable joints, Joints allowing movement
- F16L27/12—Adjustable joints, Joints allowing movement allowing substantial longitudinal adjustment or movement
Definitions
- the present invention relates to a pipe joint having a disconnection prevention function and a pipe joining method.
- a pipe joint of this type is described in Japanese Patent Application Laid-Open No. 2005-140138.
- the spigot 202 of the first pipe 201 is inserted into the socket 204 of the second pipe 203 .
- a lock ring receiving groove 205 is formed in the inner peripheral surface of the socket 204 .
- a lock ring 206 that is split in the circumferential direction is accommodated in the lock ring accommodation groove 205 .
- An insertion opening protrusion 207 is formed on the outer peripheral surface of the insertion opening 202 .
- Lock ring 206 has a tapered surface 209 facing the open end of socket 204 and a back surface 212 facing into socket 204 .
- the insertion port 202 and the socket 204 tend to separate in the axial direction of the pipe, and as shown in the figure, the insertion port projection 207 is pulled from the insertion port 202. engages the lock ring 206 from the back of the receptacle 204 in the disengagement direction 211 of .
- an extraction force acts on the lock ring 206 to separate the insertion opening 202 and the receiving opening 204 from each other in the axial direction of the tube. Due to this force, the tapered surface 209 of the lock ring 206 contacts the opening edge 208 of the lock ring accommodating groove 205 in the direction of the tube axis, and the insertion opening protrusion 207 contacts the back surface 212 of the lock ring 206 . These contacts prevent spigot 202 from disengaging from receptacle 204 .
- the force acting between the tubes 201 and 203 with the contacting portion as the operating position moves the tapered surface 209 in the axial direction of the tube. acts as a pushing force F.
- This force F is divided into a component force F1 in the direction perpendicular to the tangential plane at the contact portion on the tapered surface 209 and a component force F2 in the direction parallel to the tangential plane.
- the line of action 210 of the component force F1 in the direction perpendicular to the tangent plane extends in the direction of the surface normal to the tangent plane.
- the slope of the tapered surface 209 is set so that the normal to the surface passes through the inner peripheral surface of the lock ring 206 toward the insertion opening 202 .
- the lock ring 206 may be erroneously set in the lock ring accommodating groove 205 in the opposite direction.
- the tapered surface 209 of the lock ring 206 faces into the receptacle 204 and the rear surface 212 faces the open end of the receptacle 204 .
- the lock ring 206 is erroneously set in the lock ring housing groove 205 in the opposite direction, the lock ring 206 is reversed until the operator inserts the insertion port 202 into the socket 204. can't notice. Therefore, it takes time to redo the joining work of the pipes 201 and 203 .
- An object of the present invention is to provide a pipe joint and a pipe joining method that can suppress the force that presses the lock ring against the outer periphery of the insertion port.
- the pipe joint of the present invention is the spigot of the first tube is inserted into the socket of the second tube;
- a lock ring accommodating groove is formed on the inner circumference of the socket,
- the lock ring accommodated in the lock ring accommodation groove is attached to the outer periphery of the insertion port,
- An insertion opening protrusion is formed on the outer periphery of the insertion opening,
- a pipe joint capable of preventing the insertion opening from being detached from the socket by engaging the insertion opening protrusion with the lock ring from the back of the socket in the direction of removal of the insertion opening,
- the lock ring has a first detachment-preventing surface facing the open end of the socket and a second detachment-preventing surface facing the interior of the socket, In a state in which the insertion opening projection is engaged with the lock ring and the first detachment prevention surface of the lock ring is in contact with the opening edge of the lock ring accommodating groove around the tube axis, the opening edge of the lock ring accommodating
- the surface normal to the tangential plane passes through the second detachment preventing surface of the lock ring, so that the surface normal to the tangential plane is less likely to pass through the inner peripheral surface of the lock ring.
- the radial component of the force along the lock ring is reduced, and the acting force based on the extraction force can suppress the force that presses the lock ring against the outer periphery of the insertion port.
- the inner peripheral edge of the lock ring is included in the second detachment prevention surface,
- the surface normal to the tangential plane passing through the second detachment preventing surface preferably passes through the inner peripheral edge of the lock ring.
- the inner peripheral edge of the lock ring is included in the second detachment prevention surface
- the surface normal to the tangential plane passing through the second detachment preventing surface is the second detachment preventing surface between the inner peripheral edge of the lock ring and the position where the outer peripheral edge of the insertion opening protrusion contacts the second detachment preventing surface. preferred to pass.
- the first detachment prevention surface of the lock ring is preferably formed in a conical shape.
- the first detachment preventing surface of the lock ring preferably has a shape curving along an arc centered on the surface normal to the tangential plane.
- the center of the arc of the first detachment preventing surface is at the intersection of the surface normal to the tangent plane and the second detachment preventing surface.
- the lock ring is a split structure ring having a divided portion at one location along the circumferential direction, Both end faces of the split portion in the circumferential direction of the lock ring have engaging portions that can be engaged by a gap maintaining tool that maintains the gap between the both end faces of the lock ring with an enlarged diameter, At least one of the end faces of the lock ring has a relief portion for escaping the distance maintaining instrument in a detachment direction of detaching from the end face of the lock ring radially inward of the lock ring,
- the engaging portion is positioned near the open end of the socket, and the relief portion is positioned near the inner end of the socket, It is preferable that the engaging portion and the relief portion are exposed radially inward from the lock ring accommodating groove in a state in which the diameter of the lock ring is expanded.
- the lock ring is first set in the lock ring accommodating groove.
- the engaging portion is positioned near the open end of the socket, and the relief portion is located at the deep end of the socket. located nearby.
- the space-maintaining tool is inserted from the open end of the socket into the split portion of the lock ring and engaged with both engaging portions.
- the space maintaining instrument engages with the engaging portion.
- the gap between the end faces of the enlarged lock ring can be maintained by the gap maintaining tool.
- the socket is inserted into the socket.
- the space maintaining tool is removed from the lock ring. This removal causes the lock ring to contract.
- the lock ring When the first pipe and the second pipe are joined, the lock ring may be erroneously set in the lock ring accommodating groove in the opposite direction in the pipe axial direction. At that time, the relief portion is positioned closer to the open end of the socket, and the engaging portion is positioned closer to the inner end of the socket.
- the gap maintaining device will not engage. It does not engage with the mating portion, but is guided by the relief portion and detached from the end face of the lock ring. For this reason, it is not possible to maintain the distance between the end faces of the lock ring whose diameter has been expanded by means of the distance maintenance tool.
- the relief portion is an inclined surface extending from the end surface of the lock ring to the inner peripheral surface of the lock ring. preferably inclined in the direction of
- the relief portion is a curved surface that is curved in an arc from the end surface of the lock ring to the inner peripheral surface of the lock ring. It is preferable that they are curved in a direction in which the distance between them increases.
- a pipe joining method for assembling the pipe joint of the present invention comprises: Set the lock ring in the lock ring accommodation groove in the socket, In a state in which the diameter of the lock ring is expanded using the diameter expansion tool, the gap maintenance tool is inserted from the open end of the socket into the split portion of the lock ring and engaged with the engagement portions on both end faces, removing the diameter-expanding tool from the lock ring and maintaining the distance between the end faces of the expanded lock ring with the space-maintaining tool; By inserting the spigot into the socket, when the protruding part of the spigot passes through the inner circumference of the lock ring from the open end of the socket to the back of the socket, remove the gap maintaining tool from the lock ring and insert it into the lock ring. is characterized by reducing the diameter of the
- the engaging portion is positioned near the open end of the socket, and the relief portion is located in the socket. Located near the far end. For this reason, the space maintaining tool can be engaged with both engaging portions of the lock ring to maintain the space between the end faces of the lock ring whose diameter has been enlarged by the space maintaining tool.
- a pipe joining method for assembling the pipe joint of the present invention comprises: Set the lock ring in the lock ring accommodation groove in the socket, In a state in which the diameter of the lock ring is expanded using the diameter expansion tool, the gap maintenance tool is inserted into the split portion of the lock ring from the open end of the socket and engaged with the engagement portions on both end faces.
- the gap maintenance tool is inserted from the open end of the socket into the split portion of the lock ring and engaged with the engagement portions on both end faces, removing the diameter-expanding tool from the lock ring and maintaining the distance between the end faces of the expanded lock ring with the space-maintaining tool;
- the relief portion is located near the open end of the socket, and the engaging portion is positioned near the socket opening. located near the far end of the For this reason, the space maintaining instrument is guided by the relief portion and detached radially inward of the lock ring from the end face of the lock ring without being engaged with the engagement portion.
- the force acts from the opening edge in the tube axis direction at the point of contact between the opening edge and the first detachment preventing surface.
- Force acts on the lock ring as a force component along the surface normal to the tangent plane and a force component along the tangent plane.
- the component of force along the surface normal to this tangential plane is that the smaller the angle of the surface normal to the lock ring axial center, the greater the force component directed toward the lock ring axial direction, and the more the lock ring radial direction.
- the component of the force directed toward the Therefore, since the surface normal to the tangential plane passes through the second detachment prevention surface, the separation along the surface normal to the tangential plane is greater than when the surface normal to the tangential plane passes through the inner peripheral surface of the lock ring.
- the force component directed in the radial direction of the lock ring in the force is reduced, and the acting force based on the extraction force when the insertion opening is pulled out from the socket can suppress the force that presses the lock ring against the outer periphery of the insertion opening.
- Fig. 2 is a cross-sectional view of the pipe joint of the first embodiment of the present invention taken along the axial direction of the pipe; It is a front view of the division part of the lock ring with which the same pipe joint is equipped. It is a figure which shows the principal part of the same pipe joint.
- Fig. 1 shows the main part of the pipe joint, showing the relationship between the component force F1 along the surface normal direction of the tangential plane in the lock ring, and the component F11 directed in the pipe axial direction and the component F12 directed in the pipe radial direction of the component force F1. It is a figure which shows.
- FIG. 1 shows the main part of the pipe joint, showing the relationship between the component force F1 along the surface normal direction of the tangential plane in the lock ring, and the component F11 directed in the pipe axial direction and the component F12 directed in the pipe radial direction of the component force F1. It is a figure which shows.
- FIG. 1 shows the main part of the pipe joint, showing the relationship between the component force
- FIG. 9 is a schematic diagram showing the relationship between the tangential plane, the surface normal line, and the center position of the arc in the main part of the pipe joint according to the second embodiment of the present invention; It is a figure which shows the principal part of the pipe joint of the 3rd Embodiment of this invention. It is a figure which shows the principal part of the pipe joint of the 4th Embodiment of this invention. It is a front view of the parting part of the lock ring with which the pipe joint of the 5th Embodiment of this invention is equipped.
- FIG. 9 is a view in the direction of arrow X in FIG. 8;
- FIG. 9 is a Y arrow directional view in FIG. 8 ;
- FIG. 10 is a view for explaining a joining method of pipes constituting the same pipe joint, and shows a state in which the lock ring is set in the lock ring accommodating groove in the regular direction.
- FIG. 18 is a view for explaining the next step after FIG. 17 and shows a state in which the diameter of the lock ring is expanded using a diameter-expanding tool.
- FIG. 19 is a view for explaining the next step after FIG. 18 , showing a state in which the diameter of the lock ring is expanded using the diameter expansion tool, and the gap maintaining tool is inserted into the divided portion of the lock ring.
- FIG. 20 is a diagram explaining the next step of FIG. 19, showing how the diameter-expanding tool is removed from the lock ring and the gap between the both end surfaces of the expanded lock ring is maintained by the gap-maintaining tool.
- FIG. 21 is a diagram for explaining the next step after FIG. 20, showing how the gap maintaining instrument is removed from the lock ring and the diameter of the lock ring is reduced.
- FIG. 11 is another diagram for explaining the method of connecting pipes, showing a state in which the lock ring is set in the lock ring accommodation groove with the lock ring facing backward.
- FIG. 23 is a diagram for explaining the next step after FIG. 22 and shows a state in which the diameter of the lock ring is expanded using a diameter-expanding tool.
- FIG. 24 is a diagram for explaining the next step of FIG. 23 , and in a state in which the diameter of the lock ring is expanded using the diameter-expanding tool, when the gap-maintaining tool is inserted into the divided portion of the lock ring, the gap-maintaining tool is It shows how the end face of the lock ring is separated by being guided by the relief portion.
- FIG. 11 is a rear view of a split portion of a lock ring provided in a pipe joint according to a sixth embodiment of the present invention; It is a figure which shows the principal part of the conventional pipe joint.
- a lock ring accommodating groove 7 is formed on the inner circumference of the socket 5 along the entire circumference.
- a lock ring 8 is accommodated in the lock ring accommodation groove 7 .
- the lock ring 8 is attached to the outer circumference of the insertion opening 3 in a state of being held in the lock ring accommodating groove 7. ⁇
- An insertion opening protrusion 10 is formed around the entire periphery of the tip of the insertion opening 3 .
- the pipe joint 1 has a separation prevention function.
- the detachment prevention function prevents the insertion opening 3 from being detached from the opening 5 by engaging the insertion opening protrusion 10 with the lock ring 8 from the depth of the opening 5 in the withdrawal direction 12 of the insertion opening 3 .
- a socket projection 16 projecting inward in the radial direction 15 from the inner periphery of the socket 5 faces the lock ring accommodating groove 7 from a position near the open end of the socket 5 .
- a deep end surface 26 is formed at the deep end of the socket 5 so as to face the front end surface of the insertion port 3 along the pipe axis direction.
- annular sealing member 17 made of an elastic material such as rubber.
- a press ring 18 that presses the sealing member 17 toward the inner side of the socket 5 is in contact with the opening end face 14 of the socket 5 .
- the push ring 18 is circumferentially connected to a flange 21 at the open end of the receptacle 5 by a plurality of sets of T-bolts 19 and nuts 20 .
- a resin backup ring 23 is provided between the inner periphery of the socket projection 16 and the outer periphery of the insertion port 3 .
- the backup ring 23 is a split structure ring that is split at one point in the circumferential direction, and is arranged adjacent to the lock ring 8 .
- the insertion port 3 penetrates the inner peripheries of the pressing ring 18, the sealing member 17, the backup ring 23, and the lock ring 8.
- the lock ring 8 is a one-split structure ring having a split portion 24 split at one point in the circumferential direction 31 .
- the lock ring 8 has an inner peripheral surface 27, an outer peripheral surface 28, and a first detachment prevention surface 29 facing the open end of the socket 5 when set in the normal direction. , a second detachment prevention surface 30 that faces toward the back of the receptacle 5 when set in the normal direction, and a pair of end surfaces 32 and 33 facing each other at the dividing portion 24 .
- the first detachment prevention surface 29 can contact one opening edge 7a of the lock ring accommodating groove 7 around the tube axis.
- the second detachment prevention surface 30 is a surface that is flat along the radial direction of the lock ring 8 and faces the insertion opening protrusion 10 in the tube axial direction.
- the insertion opening projection 10 has a surface 10a facing the second detachment preventing surface 30 of the lock ring 8 on the entire circumference.
- the surface 10a of the insertion opening projection 10 is a flat surface along the radial direction, and can contact the second detachment prevention surface 30 of the lock ring 8 over the entire surface from the innermost position to the outermost position in the radial direction. be.
- the surface 10a of the insertion opening projection 10 is located between the radially innermost point A and the radially outermost point B of the lock ring 8. touch the surface 30; Point A, which is the innermost position, is the position of the inner peripheral edge 43 of the lock ring 8 .
- Point B which is the outermost position, is the position where the outer peripheral edge of the surface 10a of the insertion opening protrusion 10 contacts the second detachment prevention surface 30 of the lock ring 8.
- the point A at the innermost position of the insertion opening protrusion 10 that is, the point corresponding to the inner peripheral edge 43 of the lock ring 8 , and the point B at the outermost position are also included in the second detachment prevention surface 30 of the lock ring 8 .
- the insertion opening protrusion 10 is engaged with the lock ring 8, and the first detachment prevention surface 29 of the lock ring 8 is in contact with one opening edge 7a of the lock ring accommodating groove 7 around the tube axis. ing.
- the surface normal 42 of the tangential plane 41 at the point of contact 40 between the opening edge 7a of the lock ring accommodating groove 7 and the first detachment preventing surface 29 of the lock ring 8 is the second detachment preventing surface of the lock ring 8. 30 passes.
- the first detachment prevention surface 29 has a shape that curves along an arc having a center S1 on the surface normal 42 of the tangential plane 41 .
- the center S1 is located at the intersection of the surface normal 42 of the tangential plane 41 and the second detachment preventing surface 30 .
- the surface normal 42 of the tangential plane 41 passing through the second detachment preventing surface 30 is the radially innermost position of the second detachment preventing surface 30 in contact with the inner peripheral edge 43 of the lock ring 8 , that is, the insertion opening projection 10 . passes through point A.
- a force acts on the lock ring 8 to separate the insertion port 3 and the socket 5 from each other in the direction of the tube axis.
- This force causes the first detachment preventing surface 29 of the lock ring 8 to come into contact with the opening edge 7a of the lock ring receiving groove 7 in the direction of the tube axis, and the insertion opening protrusion 10 contacts the second detachment preventing surface 30 of the lock ring 8. touch.
- the insertion port 3 can be prevented from being detached from the receptacle 12 .
- the first detachment preventing surface 29 is pushed by the withdrawal force acting between the tubes 2 and 4.
- a force F pushing in the axial direction acts on the contact 40 as a point of action.
- This force F acts on the lock ring 8 as a component force F1 perpendicular to the tangential plane 41 at the contact point 40 of the first detachment preventing surface 29 and a component force F2 parallel to the tangential plane 41 .
- the line of action of the component force F1 perpendicular to the tangential plane 41 extends in the direction of the normal 42 of the tangential plane 41 .
- the first detachment preventing surface 29 is curved along an arc having a center S1 on the surface normal 42 of the tangent plane 41, and the center S1 of the arc of the first detachment preventing surface 29 is between the surface normal 42 of the tangent plane 41 and the surface normal 42 of the tangential plane 41. 2 It exists at the intersection with the detachment prevention surface 30 . Therefore, even if the position of the contact point 40 where the one opening edge 7a of the lock ring receiving groove 7 and the first detachment prevention surface 29 of the lock ring 8 contact each other is deviated due to an assembly error or the like, the surface normal to the tangential plane 41 can be maintained. 42 passes through the center S1 of the arc located on the second detachment preventing surface 30 .
- the surface normal 42 of the tangential plane 41 is the second detachment prevention surface. It is possible to reliably set a position through the blocking surface 30 .
- the component force F1 along the surface normal 42 of the tangential plane 41 is a force directed toward the lock ring 8 axis as the angle of the surface normal 42 with respect to the lock ring 8 axis decreases.
- component F11 increases, and the component F12 of the force acting in the radial direction of the lock ring 8 decreases.
- the position where the surface normal 42 of the tangent plane 41 at the contact point 40 passes through the second detachment preventing surface 30 also moves in the radial direction of the lock ring 8 as the center S2 of the arc moves.
- the lock ring 8 is more likely to move than when the surface normal passes through the inner peripheral surface of the lock ring 206 as shown in FIG. 26 .
- angle of the surface normal 42 with respect to the axis of As a result, the radial component F12 (see FIG. 4) of the lock ring 8 in the component force F1 along the surface normal 42 is reduced, and the lock ring 8 is pressed against the outer periphery of the insertion opening 3 based on the force from the contact 40. The pressing force can be suppressed.
- the lock ring 8 has rigidity that resists torsion. When a force exceeding this rigidity acts on the lock ring 8, the center of the moment acting on the lock ring 8 moves from point A, which is the radially innermost position, to point B, which is the outermost position.
- the first detachment prevention surface 29 of the lock ring 8 is formed as a tapered surface.
- the taper gradient of the first detachment prevention surface 29 it is possible to configure the surface normal 42 of the tangential plane 41 at the contact point 40 to pass through point A at the innermost position. Furthermore, by adjusting the slope of the tapered surface of the first detachment prevention surface 29, the surface normal 42 of the tangential plane 41 at the contact point 40 is positioned between point A at the innermost position and point B at the outermost position. It is also possible to have a configuration in which the second detachment prevention surface 30 is passed through at .
- the insertion opening protrusion 10 is formed on the outer periphery of the insertion opening 3 by build-up welding.
- the insertion opening protrusion 10 contacts the second detachment prevention surface 30 of the lock ring 8 only at point A, which is the innermost position.
- the first detachment prevention surface 29 is curved along an arc having a center S1 on the surface normal 42 of the tangential plane 41 .
- the center S1 of the arc of the first detachment preventing surface 29 is at the intersection of the surface normal 42 of the tangential plane 41 at the point of contact 40 and the second detachment preventing surface 30 .
- the surface normal 42 of the tangential plane 41 passing through the second detachment preventing surface 30 passes through point A at the radially innermost position of the second detachment preventing surface 30 .
- a moment due to the component force F1 along the surface normal 42 does not act on the lock ring 8 around point A at the innermost position.
- the angle of the surface normal 42 with respect to the axis of the lock ring 8 decreases.
- the radial component F12 of the component force F1 along the surface normal 42 is reduced, and the pressing force that presses the lock ring 8 against the outer periphery of the insertion opening 3 based on the force from the contact 40 can be suppressed.
- the lock ring 8 is an elastic metal ring that can be elastically expanded and contracted in the radial direction. Therefore, the lock ring 8 can be diameter-expanded using the diameter-expanding tool 101 shown in FIG. Further, the lock ring 8 can maintain the space 34 between the end faces 32 and 33 at the dividing portion 24 by using the space maintaining tool 123 shown in FIGS. 15 and 16 .
- both end faces 32 and 33 of the split portion 24 of the lock ring 8 are engaged with the contact bodies 121 and 122 (see FIGS. 15 and 16) of the interval maintaining device 123. It has joining portions 32a and 33a.
- a detachment direction 44 is a direction in which the contact bodies 121 and 122 detach from the end surface 32 of the lock ring 8 radially inwardly of the lock ring 8 .
- the escape portion 45 is an inclined surface extending from the end surface 32 of the lock ring 8 to the inner peripheral surface 27 .
- the relief portion 45 is inclined in the direction in which the interval 34 between the end surfaces 32 and 33 increases toward the inner side in the radial direction.
- the distance 34 between the end surfaces 32 and 33 is inclined in such a direction as to increase from the first detachment preventing surface 29 toward the second detachment preventing surface 30 .
- the relief portion 45 is reduced in the radial direction 15 as it approaches the first detachment preventing surface 29 from the second detachment preventing surface 30, and when viewed from the circumferential direction 31 of the lock ring 8, the relief portion 45 is reduced. It is formed in the shape of a right triangle.
- the diameter-expanding tool 101 is a scissors-like jig and has a pair of legs 102 that can be freely opened and closed, a threaded rod 103 screwed to both legs 102, and a handle 104. are doing.
- the handle 104 is rotated, the legs 102 are opened and closed by the feeding mechanism of the screw of the threaded rod 103, and the distance between the tips of the legs 102 is enlarged or reduced.
- a pair of space maintaining instruments 123 are inserted into the split portion 24 of the lock ring 8 and are capable of contacting the engagement portions 32 a and 33 a of the end faces 32 and 33 of the lock ring 8 .
- a spacing adjusting member 125 that connects both the contact bodies 121 and 122 and can adjust the spacing 124 between the two contact bodies 121 and 122 along the circumferential direction 31 of the lock ring 8. are doing.
- the interval adjusting member 125 includes a threaded portion 126 provided over the first contact body 121 and the second contact body 122, a butterfly bolt 127 attached to one end of the threaded portion 126 to rotate the threaded portion 126, and a shaft portion 128 attached to the other end of the threaded portion 126 .
- the shaft portion 128 is a straight round bar-shaped member having a smaller diameter than the root portion of the threaded portion 126 and having no threads formed on the outer periphery.
- the first contact member 121 includes a plate-shaped insertion portion 121a formed to extend to the outside of the socket 5, a handle portion 121b, and a supporter 121c through which the shaft portion 128 of the screw portion 126 is inserted. have.
- the threaded portion 126 idles with respect to the supporter 121c, and the supporter 121c is prevented from moving relative to the threaded portion 126 in the axial direction.
- the second contact member 122 has a plate-like insertion portion 122a extending to the outside of the receptacle 5, a handle portion 122b, and a screw portion 126. and a feed nut 122c having an internal thread 122d. A screw portion 126 is screwed onto the feed nut 122c.
- a rod-like rotation prevention member 129 is attached to the outer surface of the supporter 121c of the first contact body 121 to prevent the first contact body 121 and the second contact body 122 from rotating relative to each other. there is The anti-rotation member 129 extends from the supporter 121c of the first contact body 121 to the feed nut portion 122c of the second contact body 122. As shown in FIG.
- the second contact body 122 By rotating the threaded portion 126, the second contact body 122 approaches and separates from the first contact body 121 in the axial direction of the threaded portion 126 by the screw feeding mechanism. This moving toward and away from each other allows adjustment of the spacing 124 between the first contact 121 and the second contact 122 .
- the backup ring 23, the seal member 17, and the pressing ring 18 are externally fitted to the insertion opening 3 in advance.
- the lock ring 8 is set in the lock ring receiving groove 7 as shown in FIG.
- the engaging portion 32a of one end face 32 is positioned closer to the open end face 14 of the socket 5.
- the relief portion 45 is positioned closer to the inner end surface 26 (see FIG. 1) of the socket 5 .
- both leg portions 102 of the diameter-enlarging instrument 101 are inserted into the split portion 24 of the lock ring 8 .
- This insertion is performed by inserting the tip of one leg 102 into the lock ring accommodating groove 7 and engaging with one end face 32 of the lock ring 8, and inserting the tip of the other leg 102 into the lock ring accommodating groove 7. to engage with the other end surface 33 of the lock ring 8 .
- both insertion portions 121a and 122a of the interval maintaining instrument 123 are inserted into the cut portion 24 of the lock ring 8 from the opening end of the socket 5.
- the butterfly bolt 127 is turned to widen the space 124 between the first contact member 121 and the second contact member 122 .
- the insertion portion 121a of the first contact body 121 of the interval maintaining tool 123 is engaged with the engaging portion 32a of the one end surface 32 of the lock ring 8.
- the insertion portion 122a of the second contact body 122 engages with the engaging portion 33a of the other end face 33 of the lock ring 8.
- the diameter-enlarging tool 101 is removed from the lock ring 8, as shown in FIG. As a result, the space 34 between the end faces 32 and 33 of the lock ring 8 whose diameter has been expanded is maintained by the space maintaining tool 123 . As a result, even if the diameter-expanding instrument 101 is removed from the lock ring 8, the lock ring 8 is maintained in the diameter-expanded state.
- the insertion port 3 is inserted into the socket 5 under this condition.
- the interval maintaining tool 123 is removed from the lock ring 8 .
- the backup ring 23 is moved in the pipe axial direction and inserted between the inner periphery of the socket projection 16 and the outer periphery of the insertion port 3 .
- the seal member 17 is moved in the direction of the tube axis and inserted between the inner periphery of the socket 5 and the outer periphery of the insertion port 3 .
- a plurality of sets of T-shaped bolts 19 and nuts 20 are used to connect the press ring 18 to the flange portion 21 of the socket 5 and abut the open end surface 14 . Thereby, the pipes 2 and 4 are joined together.
- both leg portions 102 of the diameter-enlarging instrument 101 are inserted into the dividing portion 24 of the lock ring 8. As shown in FIG. This insertion is performed by inserting the tip of one leg 102 into the lock ring accommodating groove 7 and engaging with one end face 32 of the lock ring 8, and inserting the tip of the other leg 102 into the lock ring accommodating groove 7. to engage with the other end surface 33 of the lock ring 8 .
- both legs 102 are opened by rotating the handle 104 .
- the gap 34 between the end faces 32 and 33 of the lock ring 8 is increased, and the diameter of the lock ring 8 is increased.
- both insertion portions 121a and 122a of the interval maintaining instrument 123 are inserted into the cut portion 24 of the lock ring 8 from the opening end of the socket 5.
- the space 124 between the first contact member 121 and the second contact member 122 is enlarged.
- the gap 34 between the end faces 32 and 33 of the lock ring 8 diameter-expanded by the diameter-expanding tool 101 cannot be maintained by the gap-maintaining tool 123 . Therefore, the operator can notice that the lock ring 8 is mounted in the opposite direction in the pipe axial direction before performing the pipe insertion work of inserting the spigot 3 into the socket 5 . Therefore, it is possible to shorten the time required for redoing the joining work of the first pipe 2 and the second pipe 4 .
- the diameter of the lock ring 8 is reduced by removing the diameter-expanding tool 101 from the lock ring 8 .
- the diameter-reduced lock ring 8 is removed from the lock ring receiving groove 7 .
- the removed lock ring is corrected in the normal direction and then set in the lock ring accommodating groove 7 again.
- the diameter of the lock ring 8 may be expanded by the diameter expansion device 101 and the lock ring 8 may be maintained in the expanded state by the interval maintenance device 123.
- the lock ring 8 does not have the relief portion 45 (see FIG. 9) provided in the fifth embodiment.
- the first to fourth embodiments may use the lock ring 8 having the relief portion 45 as in the fifth embodiment. In that case, the tubes 2 and 4 are joined together in the same procedure as in the fifth embodiment.
- the relief portion 45 is an inclined surface.
- the relief portion 45 is not limited to an inclined surface.
- the relief portion 45 may be an arc-shaped curved surface extending from the end surface 32 of the lock ring 8 to the inner peripheral surface 27 . This curved surface is curved in a direction in which the interval 34 between the end surfaces 32 and 33 increases toward the radially inner side.
- the relief portion 45 is formed on one end face 32 of the lock ring 8. As shown in FIGS. However, relief portions 45 may be formed on both end surfaces 32 and 33, respectively.
- the lock ring 8 does not have the relief portion 45 (see FIG. 25) as shown in the sixth embodiment.
- the lock ring 8 having the relief portion 45 may be used as in the sixth embodiment.
- the surface normal to the tangential plane passes through the second detachment preventing surface of the lock ring, so that the surface normal to the tangential plane is less likely to pass through the inner peripheral surface of the lock ring.
- the radial component of the force along the lock ring is reduced, and the acting force based on the extraction force can suppress the force that presses the lock ring against the outer periphery of the insertion port.
- the inner peripheral edge of the lock ring is included in the second detachment prevention surface,
- the surface normal to the tangential plane passing through the second detachment preventing surface is the second detachment preventing surface between the inner peripheral edge of the lock ring and the position where the outer peripheral edge of the insertion opening protrusion contacts the second detachment preventing surface.
- the pipe joint of technique 1 characterized by passing through.
- the lock ring is a split structure ring having a divided portion at one place along the circumferential direction, Both end faces of the split portion in the circumferential direction of the lock ring have engaging portions that can be engaged by a gap maintaining tool that maintains the gap between the both end faces of the lock ring with an enlarged diameter, At least one of the end faces of the lock ring has a relief portion for escaping the distance maintaining instrument in a detachment direction of detaching from the end face of the lock ring radially inward of the lock ring,
- the engaging portion is positioned near the open end of the socket, and the relief portion is positioned near the inner end of the socket, 7.
- the pipe joint according to any one of Techniques 1 to 6, wherein the engaging portion and the relief portion are exposed radially inward from the lock ring accommodating groove in a state in which the diameter of the lock ring is expanded.
- the lock ring is first set in the lock ring accommodating groove.
- the engaging portion is positioned near the open end of the socket, and the relief portion is located at the far end of the socket. located closer to
- the space-maintaining tool is inserted from the open end of the socket into the split portion of the lock ring and engaged with both engaging portions.
- the space maintaining instrument engages with the engaging portion.
- the gap between the end faces of the enlarged lock ring can be maintained by the gap maintaining tool.
- the socket is inserted into the socket.
- the space maintaining tool is removed from the lock ring. This removal causes the lock ring to contract.
- the lock ring When the first pipe and the second pipe are joined, the lock ring may be erroneously set in the lock ring accommodating groove in the opposite direction in the pipe axial direction. At that time, the relief portion is positioned closer to the open end of the socket, and the engaging portion is positioned closer to the inner end of the socket.
- the gap maintaining device will not engage. It does not engage with the mating portion, but is guided by the relief portion and detached from the end face of the lock ring. For this reason, it is not possible to maintain the distance between the end faces of the lock ring whose diameter has been expanded by means of the distance maintenance tool.
- the relief portion is an inclined surface extending from the end surface of the lock ring to the inner peripheral surface of the lock ring, and this inclined surface is inclined in the direction in which the distance between the end surfaces of the lock ring widens toward the inner side in the radial direction.
- the pipe joint of technique 7 characterized by the above.
- the relief portion is a curved surface that is curved in an arc from the end surface of the lock ring to the inner peripheral surface of the lock ring.
- the diameter expansion tool is used to expand the diameter of the lock ring. are guided radially inwardly of the lock ring and separated from the end face of the lock ring.
- the engaging portion is positioned near the open end of the socket, and the relief portion is located in the socket. Located near the far end. For this reason, the space maintaining tool can be engaged with both engaging portions of the lock ring to maintain the space between the end faces of the lock ring whose diameter has been enlarged by the space maintaining tool.
- the gap maintenance tool is inserted from the open end of the socket into the split portion of the lock ring and engaged with the engagement portions on both end faces, removing the diameter-expanding tool from the lock ring and maintaining the distance between the end faces of the expanded lock ring with the space-maintaining tool;
- the relief portion is located near the open end of the socket, and the engaging portion is positioned close to the socket. located near the far end of the For this reason, the space maintaining instrument is guided by the relief portion and detached radially inward of the lock ring from the end face of the lock ring without being engaged with the engagement portion.
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Abstract
Description
面法線がロックリング206の内周面を通って挿し口202に向かうように、テーパ面209の勾配が設定されている。
第1の管の挿し口が第2の管の受口に挿入され、
受口の内周にロックリング収容溝が形成され、
ロックリング収容溝に収容されたロックリングが挿し口の外周に装着され、
挿し口の外周に挿し口突部が形成され、
挿し口突部が挿し口の離脱方向において受口の奥からロックリングに係合することにより、挿し口が受口から離脱することを防止可能な管継手であって、
ロックリングは、受口の開口端に向く第1離脱阻止面と、受口の奥に向く第2離脱阻止面とを有し、
挿し口突部がロックリングに係合し、ロックリングの第1離脱阻止面がロックリング収容溝の開口縁と管軸心周りにおいて接している状態で、ロックリング収容溝の開口縁とロックリングの第1離脱阻止面との接点における接平面の面法線がロックリングの第2離脱阻止面を通ることを特徴とする。
第2離脱阻止面を通る接平面の面法線はロックリングの内周縁を通ることが好ましい。
第2離脱阻止面を通る接平面の面法線は、ロックリングの内周縁と、挿し口突部の外周縁が第2離脱阻止面に接触する位置との間において、第2離脱阻止面を通ることが好ましい。
ロックリングの周方向における分断部の両端面は、拡径されたロックリングの両端面どうしの間隔を維持する間隔維持用器具が係合可能な係合部を有し、
ロックリングの少なくともいずれか片方の端面は、間隔維持用器具をロックリングの端面からロックリングの径方向内側へ離脱する離脱方向へ逃がすための逃し部を有し、
ロックリングが正規の向きでロックリング収容溝に収容されている場合、係合部が受口の開口端に近い方に位置するとともに、逃し部が受口の奥端に近い方に位置し、
ロックリングが拡径された状態で、係合部と逃し部とがロックリング収容溝から径方向内側へ露出することが好ましい。
受口内のロックリング収容溝にロックリングをセットし、
拡径用器具を用いてロックリングを拡径した状態で、間隔維持用器具を受口の開口端からロックリングの分断部に挿入して両端面の係合部に係合させ、
拡径用器具をロックリングから取り外して、拡径されたロックリングの両端面どうしの間隔を間隔維持用器具で維持し、
挿し口を受口に挿入することで、挿し口突部がロックリングの内周を受口の開口端から受口の奥へ通過したなら、間隔維持用器具をロックリングから取り外して、ロックリングを縮径させることを特徴とする。
受口内のロックリング収容溝にロックリングをセットし、
拡径用器具を用いてロックリングを拡径した状態で、間隔維持用器具を受口の開口端からロックリングの分断部に挿入して両端面の係合部に係合させる際、間隔維持用器具が、係合部に係合せずに、逃し部に案内されてロックリングの端面から離脱した場合、ロックリングの取付向きが管軸方向において逆であると判断し、
拡径用器具をロックリングから取り外してロックリングを縮径し、
ロックリングをロックリング収容溝から取り外し、
ロックリングを正規の向きに修正してロックリング収容溝にセットし直し、
拡径用器具を用いてロックリングを拡径した状態で、間隔維持用器具を受口の開口端からロックリングの分断部に挿入して両端面の係合部に係合させ、
拡径用器具をロックリングから取り外して、拡径されたロックリングの両端面どうしの間隔を間隔維持用器具で維持し、
挿し口を受口に挿入することで、挿し口突部がロックリングの内周を受口の開口端から受口の奥へ通過したなら、間隔維持用器具をロックリングから取り外して、ロックリングを縮径させることを特徴とする。
第1の実施の形態では、図1に示すように、管継手1において、第1の管2の挿し口3が第2の管4の受口5に挿入されて、管2,4同士が接合されている。
第2の実施の形態では、図5に示すように、ロックリング収容溝7の開口縁7a(図3参照)とロックリング8の第1離脱阻止面29とが接点40において接している。第1離脱阻止面29の円弧の中心S2を第2離脱阻止面30上においてロックリング8の径方向に変位させると、接点40と円弧の中心S2との間の距離の変化に伴って第1離脱阻止面29の断面形状が変化する。
第3の実施の形態では、図6に示すように、ロックリング8の第1離脱阻止面29がテーパ面として形成されている。
第4の実施の形態では、図7に示すように、挿し口突部10は、肉盛り溶接によって挿し口3の外周に形成されている。挿し口突部10は、最内側位置のA点でのみロックリング8の第2離脱阻止面30に接する。第1離脱阻止面29は、接平面41の面法線42上に中心S1を有する円弧に沿って湾曲している。第1離脱阻止面29の円弧の中心S1は、接点40における接平面41の面法線42と第2離脱阻止面30との交点にある。
第5の実施の形態では、先述した第1~第4の実施の形態におけるロックリング8に、以下のような構造を追加している。以下において、第1~第4の実施の形態において説明した管継手1と同じ部材については、同一の符号を付記して、詳細な説明を省略する。
先述した第5の実施の形態では、図12に示すように、逃し部45は傾斜面である。しかし、逃し部45は、傾斜面に限定されるものではない。例えば、第6の実施の形態として、図25に示すように、逃し部45は、ロックリング8の端面32から内周面27に至る円弧状に湾曲した湾曲面であってもよい。この湾曲面は、径方向内側ほど両端面32,33どうしの間隔34が拡大する方向に湾曲している。
(技術1)
第1の管の挿し口が第2の管の受口に挿入され、
受口の内周にロックリング収容溝が形成され、
ロックリング収容溝に収容されたロックリングが挿し口の外周に装着され、
挿し口の外周に挿し口突部が形成され、
挿し口突部が挿し口の離脱方向において受口の奥からロックリングに係合することにより、挿し口が受口から離脱することを防止可能な管継手であって、
ロックリングは、受口の開口端に向く第1離脱阻止面と、受口の奥に向く第2離脱阻止面とを有し、
挿し口突部がロックリングに係合し、ロックリングの第1離脱阻止面がロックリング収容溝の開口縁と管軸心周りにおいて接している状態で、ロックリング収容溝の開口縁とロックリングの第1離脱阻止面との接点における接平面の面法線がロックリングの第2離脱阻止面を通ることを特徴とする管継手。
ロックリングの内周縁は第2離脱阻止面に含まれており、
第2離脱阻止面を通る接平面の面法線はロックリングの内周縁を通ることを特徴とする技術1の管継手。
ロックリングの内周縁は第2離脱阻止面に含まれており、
第2離脱阻止面を通る接平面の面法線は、ロックリングの内周縁と、挿し口突部の外周縁が第2離脱阻止面に接触する位置との間において、第2離脱阻止面を通ることを特徴とする技術1の管継手。
ロックリングの第1離脱阻止面は円錐面状に形成されていることを特徴とする技術1から技術3の何れかの管継手。
ロックリングの第1離脱阻止面は接平面の面法線上に中心を有する円弧に沿って湾曲する形状を有していることを特徴とする技術1から技術3の何れかの管継手。
第1離脱阻止面の円弧の中心は接平面の面法線と第2離脱阻止面との交点にあることを特徴とする技術5の管継手。
ロックリングは周方向に沿った一箇所に分断部を有する一つ割構造のリングであり、
ロックリングの周方向における分断部の両端面は、拡径されたロックリングの両端面どうしの間隔を維持する間隔維持用器具が係合可能な係合部を有し、
ロックリングの少なくともいずれか片方の端面は、間隔維持用器具をロックリングの端面からロックリングの径方向内側へ離脱する離脱方向へ逃がすための逃し部を有し、
ロックリングが正規の向きでロックリング収容溝に収容されている場合、係合部が受口の開口端に近い方に位置するとともに、逃し部が受口の奥端に近い方に位置し、
ロックリングが拡径された状態で、係合部と逃し部とがロックリング収容溝から径方向内側へ露出することを特徴とする技術1から技術6の何れかの管継手。
逃し部は、ロックリングの端面からロックリングの内周面に至る傾斜面であり、この傾斜面は、径方向内側ほどロックリングの両端面どうしの間隔が拡大する方向に傾斜していることを特徴とする技術7の管継手。
逃し部は、ロックリングの端面からロックリングの内周面に至る円弧状に湾曲した湾曲面であり、この湾曲面は、径方向内側ほどロックリングの両端面どうしの間隔が拡大する方向に湾曲していることを特徴とする技術7の管継手。
上記技術7から技術9のいずれかの管継手を組み立てるための管の接合方法であって、
受口内のロックリング収容溝にロックリングをセットし、
拡径用器具を用いてロックリングを拡径した状態で、間隔維持用器具を受口の開口端からロックリングの分断部に挿入して両端面の係合部に係合させ、
拡径用器具をロックリングから取り外して、拡径されたロックリングの両端面どうしの間隔を間隔維持用器具で維持し、
挿し口を受口に挿入することで、挿し口突部がロックリングの内周を受口の開口端から受口の奥へ通過したなら、間隔維持用器具をロックリングから取り外して、ロックリングを縮径させることを特徴とする管の接合方法。
上記技術7から技術9のいずれかの管継手を組み立てるための管の接合方法であって、
受口内のロックリング収容溝にロックリングをセットし、
拡径用器具を用いてロックリングを拡径した状態で、間隔維持用器具を受口の開口端からロックリングの分断部に挿入して両端面の係合部に係合させる際、間隔維持用器具が、係合部に係合せずに、逃し部に案内されてロックリングの端面から離脱した場合、ロックリングの取付向きが管軸方向において逆であると判断し、
拡径用器具をロックリングから取り外してロックリングを縮径し、
ロックリングをロックリング収容溝から取り外し、
ロックリングを正規の向きに修正してロックリング収容溝にセットし直し、
拡径用器具を用いてロックリングを拡径した状態で、間隔維持用器具を受口の開口端からロックリングの分断部に挿入して両端面の係合部に係合させ、
拡径用器具をロックリングから取り外して、拡径されたロックリングの両端面どうしの間隔を間隔維持用器具で維持し、
挿し口を受口に挿入することで、挿し口突部がロックリングの内周を受口の開口端から受口の奥へ通過したなら、間隔維持用器具をロックリングから取り外して、ロックリングを縮径させることを特徴とする管の接合方法。
Claims (11)
- 第1の管の挿し口が第2の管の受口に挿入され、
受口の内周にロックリング収容溝が形成され、
ロックリング収容溝に収容されたロックリングが挿し口の外周に装着され、
挿し口の外周に挿し口突部が形成され、
挿し口突部が挿し口の離脱方向において受口の奥からロックリングに係合することにより、挿し口が受口から離脱することを防止可能な管継手であって、
ロックリングは、受口の開口端に向く第1離脱阻止面と、受口の奥に向く第2離脱阻止面とを有し、
挿し口突部がロックリングに係合し、ロックリングの第1離脱阻止面がロックリング収容溝の開口縁と管軸心周りにおいて接している状態で、ロックリング収容溝の開口縁とロックリングの第1離脱阻止面との接点における接平面の面法線がロックリングの第2離脱阻止面を通ることを特徴とする管継手。 - ロックリングの内周縁は第2離脱阻止面に含まれており、
第2離脱阻止面を通る接平面の面法線はロックリングの内周縁を通ることを特徴とする請求項1に記載の管継手。 - ロックリングの内周縁は第2離脱阻止面に含まれており、
第2離脱阻止面を通る接平面の面法線は、ロックリングの内周縁と、挿し口突部の外周縁が第2離脱阻止面に接触する位置との間において、第2離脱阻止面を通ることを特徴とする請求項1に記載の管継手。 - ロックリングの第1離脱阻止面は円錐面状に形成されていることを特徴とする請求項1から請求項3の何れか1項に記載の管継手。
- ロックリングの第1離脱阻止面は接平面の面法線上に中心を有する円弧に沿って湾曲する形状を有していることを特徴とする請求項1から請求項3の何れか1項に記載の管継手。
- 第1離脱阻止面の円弧の中心は接平面の面法線と第2離脱阻止面との交点にあることを特徴とする請求項5に記載の管継手。
- ロックリングは周方向に沿った一箇所に分断部を有する一つ割構造のリングであり、
ロックリングの周方向における分断部の両端面は、拡径されたロックリングの両端面どうしの間隔を維持する間隔維持用器具が係合可能な係合部を有し、
ロックリングの少なくともいずれか片方の端面は、間隔維持用器具をロックリングの端面からロックリングの径方向内側へ離脱する離脱方向へ逃がすための逃し部を有し、
ロックリングが正規の向きでロックリング収容溝に収容されている場合、係合部が受口の開口端に近い方に位置するとともに、逃し部が受口の奥端に近い方に位置し、
ロックリングが拡径された状態で、係合部と逃し部とがロックリング収容溝から径方向内側へ露出することを特徴とする請求項1に記載の管継手。 - 逃し部は、ロックリングの端面からロックリングの内周面に至る傾斜面であり、この傾斜面は、径方向内側ほどロックリングの両端面どうしの間隔が拡大する方向に傾斜していることを特徴とする請求項7に記載の管継手。
- 逃し部は、ロックリングの端面からロックリングの内周面に至る円弧状に湾曲した湾曲面であり、この湾曲面は、径方向内側ほどロックリングの両端面どうしの間隔が拡大する方向に湾曲していることを特徴とする請求項7に記載の管継手。
- 上記請求項7から請求項9のいずれか1項に記載の管継手を組み立てるための管の接合方法であって、
受口内のロックリング収容溝にロックリングをセットし、
拡径用器具を用いてロックリングを拡径した状態で、間隔維持用器具を受口の開口端からロックリングの分断部に挿入して両端面の係合部に係合させ、
拡径用器具をロックリングから取り外して、拡径されたロックリングの両端面どうしの間隔を間隔維持用器具で維持し、
挿し口を受口に挿入することで、挿し口突部がロックリングの内周を受口の開口端から受口の奥へ通過したなら、間隔維持用器具をロックリングから取り外して、ロックリングを縮径させることを特徴とする管の接合方法。 - 上記請求項7から請求項9のいずれか1項に記載の管継手を組み立てるための管の接合方法であって、
受口内のロックリング収容溝にロックリングをセットし、
拡径用器具を用いてロックリングを拡径した状態で、間隔維持用器具を受口の開口端からロックリングの分断部に挿入して両端面の係合部に係合させる際、間隔維持用器具が、係合部に係合せずに、逃し部に案内されてロックリングの端面から離脱した場合、ロックリングの取付向きが管軸方向において逆であると判断し、
拡径用器具をロックリングから取り外してロックリングを縮径し、
ロックリングをロックリング収容溝から取り外し、
ロックリングを正規の向きに修正してロックリング収容溝にセットし直し、
拡径用器具を用いてロックリングを拡径した状態で、間隔維持用器具を受口の開口端からロックリングの分断部に挿入して両端面の係合部に係合させ、
拡径用器具をロックリングから取り外して、拡径されたロックリングの両端面どうしの間隔を間隔維持用器具で維持し、
挿し口を受口に挿入することで、挿し口突部がロックリングの内周を受口の開口端から受口の奥へ通過したなら、間隔維持用器具をロックリングから取り外して、ロックリングを縮径させることを特徴とする管の接合方法。
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CN202280084450.6A CN118434994A (zh) | 2021-12-20 | 2022-12-08 | 管接头及管的接合方法 |
EP22910925.1A EP4435309A1 (en) | 2021-12-20 | 2022-12-08 | Pipe joint and pipe joining method |
CA3240754A CA3240754A1 (en) | 2021-12-20 | 2022-12-08 | Pipe joint and pipe joining method |
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JP2021205636A JP2023091101A (ja) | 2021-12-20 | 2021-12-20 | 管の継手構造 |
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JP2021-210080 | 2021-12-24 | ||
JP2021210080A JP2023094658A (ja) | 2021-12-24 | 2021-12-24 | 管継手および管の接合方法 |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2005140138A (ja) | 2003-11-04 | 2005-06-02 | Kubota Corp | 管の継手構造 |
JP2006057728A (ja) * | 2004-08-20 | 2006-03-02 | Kubota Corp | スペーサおよびスペーサを取付けた管 |
JP2015140808A (ja) * | 2014-01-27 | 2015-08-03 | 株式会社クボタ | 離脱防止管継手 |
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- 2022-12-08 WO PCT/JP2022/045316 patent/WO2023120214A1/ja active Application Filing
- 2022-12-08 EP EP22910925.1A patent/EP4435309A1/en active Pending
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JP2005140138A (ja) | 2003-11-04 | 2005-06-02 | Kubota Corp | 管の継手構造 |
JP2006057728A (ja) * | 2004-08-20 | 2006-03-02 | Kubota Corp | スペーサおよびスペーサを取付けた管 |
JP2015140808A (ja) * | 2014-01-27 | 2015-08-03 | 株式会社クボタ | 離脱防止管継手 |
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