JP2017180472A - Pipe joint and method for connecting pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint of which size can be made small in a pipe axis direction.SOLUTION: This invention relates to a pipe joint 1 in which an insertion port 5 of the other pipe 3 is inserted into a receiving port 4 of one pipe 2, an annular seal member 7 is arranged at a clearance between an outer peripheral surface of the insertion port 5 and an inner peripheral surface of the receiving port 4, a pushing ring 8 for pushing the seal member 7 to a deep side of the receiving port 4 is outwardly fitted to the insertion port 5 to be oppositely faced from outside against an opening end part of the receiving port 4. The insertion port 5 has an insertion port protrusion part 9 at its outer peripheral part. A removal prevention member 10 engaged with the insertion port protrusion part 9 in a pipe axis direction to prevent the insertion port 5 from being removed from the receiving port 4 is arranged between the inner periphery of the pushing ring 8 and an outer periphery of the insertion port 5, the seal member 7 has a compression part 16 that is held by the outer peripheral surface of the insertion port 5 and the inner peripheral surface of the receiving port 4 and compressed in a pipe diameter direction and at the same time positioned at an outer periphery of the insertion port protrusion part 9, and the compression part 16 of the seal member 7 is positioned at the deep side of the receiving port 4 rather than the insertion port protrusion part 9.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe joint used for joining pipes and a pipe joining method.

  Conventionally, as this type of pipe joint, as shown in FIG. 19, an insertion port 104 formed at the end of the other tube 103 is provided inside the receiving port 102 formed at the end of one tube 101. The annular seal member 105 is inserted in the gap between the outer peripheral surface of the insertion port 104 and the inner peripheral surface of the receiving port 102, and a push ring 106 that pushes the seal member 105 to the back side of the receiving port 102 is attached to the insertion port 104. Some are configured to be fitted and face the opening end of the receiving port 102 from the outside.

  The insertion opening 104 has an insertion protrusion 107 on the outer periphery. In addition, an annular locking member 108 that engages with the insertion protrusion 107 in the tube axis direction and prevents the insertion opening 104 from being detached from the receiving opening 102 includes an inner periphery of the push ring 106 and an outer periphery of the insertion opening 104. It is provided between.

  In the tube axis direction, the insertion projection 107 is separated from the seal member 105 in the separation direction A of the insertion port 104. Further, the push ring 106 and the receiving opening 102 are connected by a plurality of bolts and nuts 109, and the push ring 106 pushes the seal member 105 to the back side of the receiving opening 102 via the locking member 108.

  According to this, since the gap between the insertion opening 104 and the receiving opening 102 is sealed by the sealing member 105, it is possible to prevent the fluid in the pipes 101 and 103 from leaking between the insertion opening 104 and the receiving opening 102. . Further, since the seal member 105 is pushed to the back side of the receiving port 102 by the pusher wheel 106 via the locking member 108, the seal member 105 is pushed out of the receiving port 102 by the fluid pressure in the pipes 101 and 103. Can be prevented.

  Further, even when a detachment force acts on the insertion slot 104 due to an earthquake or the like, the insertion slot 104 is prevented from being detached from the receiving slot 102 by engaging the insertion projection 107 with the locking member 108 from the separation direction A. can do.

  In addition, the above pipe joint 100 is described in the following patent document 1, for example.

JP2015-143524A

  However, in the above conventional type, in the state where the pipes 101 and 103 are joined to each other through the pipe joint 100, the insertion port protrusion 107 is separated from the seal member 105 in the separation direction A of the insertion port 104. The length L1 from the front end portion of 104 to the insertion projection 107 becomes longer. Since the part from the front-end | tip part of the insertion port 104 to the insertion protrusion 107 is inserted in the receiving port 102, according to this, the length from the opening edge part of the receiving port 102 to the back end 110 in the receiving port 102 L2 also becomes long, and there is a problem that the receiving port 102 and thus the pipe joint 100 are enlarged in the pipe axis direction.

  An object of this invention is to provide the pipe joint which can be reduced in size in a pipe-axis direction, and the joining method of a pipe | tube.

To achieve the above object, according to the first aspect of the present invention, an insertion port formed in the other tube is inserted into a receiving port formed in one tube,
An annular seal member is provided in the gap between the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port,
A push ring that pushes the seal member to the back side of the receiving port is fitted to the insertion port and faces the opening end of the receiving port from the outside,
The insertion opening has an insertion protrusion on the outer periphery,
A separation preventing member that engages with the insertion protrusion in the tube axis direction and prevents the insertion opening from being removed from the receiving opening is provided between the inner periphery of the push wheel and the outer periphery of the insertion opening.
The seal member has a compression portion that is sandwiched between the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port and is compressed in the pipe diameter direction, and is located on the outer periphery of the insertion port protrusion.
The compression part of a sealing member is located in the back | inner side of a receiving port rather than the insertion protrusion.

  According to this, in the state where the pipes are joined together via the pipe joint, the seal member is located on the outer periphery of the insertion protrusion, so the position of the seal member and the position of the insertion protrusion are in the pipe radial direction. It overlaps and the length from the front-end | tip part of an insertion port to an insertion protrusion is shortened. Thereby, the length from the opening edge part of a receptacle to the back end in a receptacle can be shortened, and a pipe joint is reduced in size in a pipe axis direction.

In the pipe joint according to the second aspect of the present invention, a first recess is formed in the inner periphery of the seal member so that the insertion projection protrudes from the insertion direction of the insertion port,
A 1st recessed part exists in the detachment | leave direction side of an insertion port rather than the compression part of a sealing member in a pipe-axis direction.

  According to this, the sealing member can be easily inserted by inserting the sealing member into the insertion opening, moving the insertion opening in the insertion direction with respect to the sealing member, and inserting the insertion protrusion into the first recess. It can be located on the outer periphery of the protrusion.

In the pipe joint according to the third aspect of the present invention, the separation preventing member is an annular member having a one-piece structure in which one part is cut, and a separation preventing main body provided between the inner periphery of the push ring and the outer periphery of the insertion opening. And an engaging portion engageable with the insertion projection,
The engaging part protrudes from the separation preventing main body part in the insertion direction of the insertion opening,
The wall thickness in the tube diameter direction of the engaging portion is thinner than the wall thickness in the tube diameter direction of the separation preventing main body portion.

  According to this, when joining one pipe and the other pipe, the diameter of the separation preventing member is enlarged (expanded), and the separation preventing member is externally fitted from the distal end of the insertion opening to the insertion opening. Is moved to the detachment direction side of the insertion opening from the insertion protrusion, and then the diameter of the separation preventing member that has been expanded is reduced (reduced), and the separation preventing member is moved to the insertion opening. Hold it around the periphery.

  The separation prevention member has a thickness of the engaging portion that is thinner than the thickness of the separation prevention main body portion, so that the strength of the separation prevention member does not become too high, thereby increasing the diameter of the separation prevention member during pipe joining. The required force is reduced, the labor for expanding the diameter of the separation preventing member is reduced, and the pipe can be joined in a short time.

  After joining one tube and the other tube in this way, even if a detachment force acts on the insertion port due to an earthquake or the like, the insertion port protrusion engages with the engagement portion of the separation preventing member from the separation direction. As a result, the insertion opening can be prevented from being detached from the receiving opening.

  In order to stabilize the mounting posture of the separation preventing member, it is preferable to increase the width of the separation preventing member in the tube axis direction. Even in this case, the diameter of the separation preventing member can be increased as described above. The labor is reduced, and the pipe can be joined in a short time.

In the pipe joint according to the fourth aspect of the present invention, the engaging portion enters the first recess of the seal member from the insertion direction of the insertion port,
The insertion protrusion is located between the compression portion of the seal member and the engagement portion of the separation preventing member in the tube axis direction.

  According to this, since the engaging portion of the separation preventing member enters the first recess of the seal member from the insertion direction of the insertion opening, one end portion of the seal member is difficult to be deformed inward in the tube diameter direction, and the seal member Since the shape is stable, it is possible to prevent a decrease in sealing performance (watertightness).

In the pipe joint according to the fifth invention, a spacer is provided between the seal member and the push ring,
The seal member is pushed to the back side of the receiving port by a push ring through a spacer,
The spacer has a second recess on the side in contact with the seal member,
One end of the seal member is fitted in the second recess of the spacer.

According to this, since the seal member is pushed to the back side of the receiving port by the pusher wheel via the spacer, it is possible to prevent the seal member from being pushed out of the receiving port by the fluid pressure in the pipe.
At this time, since one end portion of the seal member is fitted in the second recess of the spacer, it is possible to prevent the one end portion of the seal member from being excessively deformed (moved) in the diameter expansion direction. Thereby, when joining pipes via a pipe joint, one end of the seal member is not sandwiched between the opening end surface of the receiving port and the spacer, and the sealing member is inserted between the outer peripheral surface of the insertion port and the receiving port. It can be reliably inserted between the inner peripheral surface.

The sixth invention is a method of joining pipes using the pipe joint according to any one of the first to fifth inventions,
The press ring is externally fitted to the insertion opening, and moved from the insertion protrusion to the detachment direction side of the insertion opening,
The detachment preventing member is externally fitted to the insertion opening and moved to the detachment direction side of the insertion opening from the insertion opening protrusion, and is arranged between the inner periphery of the push wheel and the outer periphery of the insertion opening,
The seal member is externally fitted to the insertion port, and is positioned on the outer periphery of the insertion port protrusion.
The insertion port is inserted into the receiving port while pushing the seal member with a push ring.

  According to this, when the insertion port is inserted into the receiving port, the compression part of the sealing member is sandwiched between the distal end of the insertion port and the inner end of the receiving port, or the sealing member is sufficiently inserted into the receiving port. It is possible to prevent the occurrence of a mounting failure such that it cannot be inserted into the housing.

  As described above, according to the present invention, in a state where the pipes are joined to each other via the pipe joint, the seal member is positioned on the outer periphery of the insertion protrusion, and therefore the position of the seal member and the position of the insertion protrusion Are overlapped in the tube diameter direction, and the length from the distal end of the insertion opening to the insertion protrusion is reduced. Thereby, the length from the opening edge part of a receptacle to the back end in a receptacle can be shortened, and a pipe joint is reduced in size in a pipe axis direction.

It is sectional drawing of the pipe joint in the 1st Embodiment of this invention. It is a partially expanded sectional view of a pipe joint. It is sectional drawing of the sealing member of a pipe joint, and shows the shape in the natural state which is not attached to a pipe joint. It is a figure of the lock ring of a pipe joint. It is a XX arrow line view in FIG. It is a figure of the push ring of a pipe joint. It is a XX arrow line view in FIG. It is a figure of the spacer of a pipe joint similarly. It is a XX arrow line view in FIG. It is a partial expanded sectional view of the spacer of a pipe joint similarly. It is sectional drawing which shows the joining method of the pipes using a pipe joint similarly. It is a reference figure showing an example of mounting failure at the time of joining pipes using a pipe joint. It is a reference figure which shows another example of the mounting defect at the time of joining pipes using a pipe joint. It is sectional drawing of the sealing member of the pipe joint in the 2nd Embodiment of this invention, and has shown the shape in the natural state which is not attached to the pipe joint. It is sectional drawing of the spacer of a pipe joint similarly. It is sectional drawing of a pipe joint similarly. It is a partially expanded sectional view of a pipe joint. It is sectional drawing which shows the joining method of the pipes using a pipe joint similarly. It is sectional drawing of the conventional pipe joint.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
In the first embodiment, as shown in FIGS. 1 and 2, reference numeral 1 denotes a pipe joint that connects one pipe 2 (deformed pipe or straight pipe) and the other pipe 3 (deformed pipe or straight pipe). There is an insertion port 5 formed at the end of the other tube 3 inserted into the receiving port 4 formed at the end of one tube 2.

  An annular seal member 7 is provided in the gap between the outer peripheral surface of the insertion port 5 and the inner peripheral surface of the receiving port 4, and a push ring 8 that pushes the seal member 7 to the back side of the receiving port 4 is fitted over the insertion port 5. Then, it faces the opening end of the receiving port 4 from the outside.

The receiving port 4 has a flange 6 at the opening end.
The insertion slot 5 has an insertion projection 9 on the entire outer periphery. Further, a lock ring 10 (an example of a detachment preventing member) that engages with the insertion projection 9 in the tube axis direction and prevents the insertion port 5 from being detached from the receiving port 4 is inserted into the inner periphery of the push wheel 8. It is provided between the outer periphery of the mouth 5. A spacer 11 is provided between the seal member 7 and the push wheel 8.

  The seal member 7 is an annular member made of rubber (elastic material), and is located on the outer peripheral side of the insertion projection 9. FIG. 3 is a cross-sectional view showing a shape in a natural state in which the seal member 7 is not attached to the pipe joint 1, and the seal member 7 is formed in a circular cross section at a position that becomes a tip when being pushed into the receiving port 4. And a base portion 17 formed in a direction approaching the push wheel 8 from the compression portion 16. The base portion 17 is made of a harder rubber than the compression portion 16.

As shown in FIGS. 1 and 2, the compression unit 16 is located on the back side of the receiving port 4 with respect to the insertion port protrusion 9 and is sandwiched between the inner peripheral surface of the receiving port 4 and the outer peripheral surface of the insertion port 5. And compressed in the pipe diameter direction.
The outer periphery of the base portion 17 is formed in a taper shape whose diameter increases in the direction A in which the insertion opening 5 is detached. On the inner periphery of the base portion 17, a first recess 18 is formed in which the insertion port protrusion 9 enters from the insertion direction B of the insertion port 5. The first recess 18 is present on the side of the insertion direction 5 of the insertion opening 5 with respect to the compression portion 16 in the tube axis direction, and has an inner diameter d1 larger than the inner diameter d of the base portion 17.

  As shown in FIGS. 1, 2, 4, and 5, the lock ring 10 is a ring-shaped metal member having a single-piece structure with one portion cut. 5 has a ring main body portion 21 (an example of a detachment prevention main body portion) fitted between the outer periphery of 5 and an engagement portion 22 that can be engaged with the insertion projection 9. The engaging portion 22 protrudes from the ring main body portion 21 in the insertion direction B of the insertion port 5 and enters between the inner peripheral surface of the first recess 18 of the seal member 7 and the outer peripheral surface of the insertion port 5.

  Further, the wall thickness T1 of the engagement portion 22 in the tube diameter direction is thinner than the wall thickness T2 of the ring body portion 21 in the tube diameter direction. Since the lock ring 10 has a split structure, an external force F that enlarges the cutting portion 23 of the lock ring 10 is applied using a dedicated diameter expanding tool, as indicated by the phantom line in FIG. Thus, the inner diameter of the lock ring 10 can be enlarged (expanded), and the external force F as described above is removed, so that the inner diameter of the lock ring 10 is restored to the original diameter.

  A groove 36 is formed in the lock ring 10, and when the diameter of the lock ring 10 is increased, the diameter increasing tool is engaged with the groove 36. Further, the lock ring 10 is formed with a plurality of cutout portions 24 (an example of a thinned portion) for facilitating deformation in the diameter increasing direction.

As shown in FIGS. 1 and 2, the insertion projection 9 is located between the compression portion 16 of the seal member 7 and the engagement portion 22 of the lock ring 10 in the tube axis direction.
As shown in FIGS. 6 and 7, the push wheel 8 is an annular member, and has an insertion portion 25 and an inclined surface 26 into which the ring main body portion 21 of the lock ring 10 is fitted on the inner peripheral portion. ing. The inner diameter d3 of the fitting portion 25 is larger than the inner diameter d4 of the push wheel 8, and the inclined surface 26 is formed between the inner peripheral surface 8a of the push wheel 8 and the inner peripheral surface 25a of the fitting portion 25. It is inclined so as to increase in diameter in the insertion direction B, and as shown in FIGS. 1 and 2, abuts against the corner portion between the end surface and the outer peripheral surface of the ring main body portion 21 of the lock ring 10.

  As shown in FIG. 1, the pusher wheel 8 and the flange 6 of the receiving port 4 are connected by a plurality of T-shaped bolts 28 and nuts 29, and the spacer 11 is sandwiched between the pusher wheel 8 and the receiving port 4. Thus, a predetermined gap 31 is formed between the pusher wheel 8 and the flange 6 of the receiving port 4, and the pusher wheel 8 and the flange 6 of the receiving port 4 are separated via the spacer 11.

  The seal member 7 is pushed to the back side of the receiving port 4 by a pusher wheel 8 through a spacer 11. As shown in FIGS. 8 to 10, the spacer 11 is an annular member made of resin, and has a second recess 32 on the side in contact with the seal member 7. In addition, the outer peripheral surface 33 of the 2nd recessed part 32 inclines so that it may expand in diameter in the insertion direction B of the insertion port 5. As shown in FIGS. 1 and 2, the end of the base portion 17 of the seal member 7 is fitted in the second recess 32 of the spacer 11.

  Further, the engaging portion 22 of the lock ring 10 passes between the inner peripheral surface of the spacer 11 and the outer peripheral surface of the insertion port 5, and the inner peripheral surface of the first recess 18 of the seal member 7 and the outer periphery of the insertion port 5. It is in between the faces.

Hereinafter, the operation of the above configuration will be described.
As shown in FIG. 1, in a state where both pipes 2 and 3 are joined together via the pipe joint 1, the compression portion 16 of the seal member 7 is the receiving port on the back side of the receiving port 4 with respect to the insertion projection 9. 4 is sandwiched between the inner peripheral surface of 4 and the outer peripheral surface of the insertion port 5 and compressed in the tube radial direction, so that the space between the receiving port 4 and the insertion port 5 is sealed. Can be prevented from leaking from between the receiving port 4 and the insertion port 5.

  Further, since the seal member 7 is pushed to the back side of the receiving port 4 by the pusher wheel 8 through the spacer 11, the seal member 7 is connected to the receiving port 4 by water pressure (an example of fluid pressure) in the pipes 2 and 3. It can be prevented from being pushed out.

  Further, even if a detachment force acts on the insertion slot 5 due to an earthquake or the like, the insertion slot 5 is engaged with the engagement part 22 of the lock ring 10 from the separation direction A, so that the insertion slot 5 is removed from the receiving slot 4. It can be prevented from leaving.

  In addition, since the seal member 7 is located on the outer periphery of the insertion protrusion 9, the position of the seal member 7 and the position of the insertion protrusion 9 overlap in the tube diameter direction and are inserted from the distal end of the insertion opening 5. The length L1 to the mouth projection 9 is shortened. Thereby, the length L2 from the opening end part of the receiving port 4 to the back end 35 in the receiving port 4 can be shortened, and the pipe joint 1 is reduced in size in the tube axis direction.

  As shown in FIGS. 1 and 2, the engaging portion 22 of the lock ring 10 is formed between the inner peripheral surface of the first recess 18 of the seal member 7 and the outer peripheral surface of the insertion port 5 from the insertion direction B of the insertion port 5. Since one end of the seal member 7 (that is, the end on the side in contact with the spacer 11) is difficult to be deformed inward in the tube diameter direction, the shape of the base portion 17 of the seal member 7 is stabilized. A decrease in sealing performance (watertightness) can be prevented.

Further, as shown in FIGS. 6 and 7, since the pusher wheel 8 is an annular member having no divided structure, the strength of the pusher wheel 8 can be increased and the cost can be reduced.
Next, a method for joining the pipes 2 and 3 using the pipe joint 1 will be described.

  As shown in FIG. 11, first, the push wheel 8 is externally fitted to the insertion slot 5, and is moved to the detachment direction A side of the insertion slot 5 from the insertion slot projection 9. Next, as shown by the phantom line in FIG. 4, an external force F is applied to the lock ring 10 using an exclusive diameter expanding tool, and the lock ring 10 is externally fitted to the insertion opening 5 with the inner diameter enlarged. Then, the insertion port 5 is moved to the detaching direction A side of the insertion port 5, and then the diameter expanding tool is removed from the lock ring 10 to reduce the diameter of the expanded lock ring 10 (reduction in diameter). Then, the lock ring 10 is hugged to the outer periphery of the insertion slot 5, and the ring main body portion 21 of the lock ring 10 is fitted into the insertion part 25 of the press wheel 8, so that the inner periphery of the press wheel 8 and the outer periphery of the insertion slot 5 are Place between.

  In the lock ring 10, the wall thickness T1 of the engaging portion 22 is thinner than the wall thickness T2 of the ring main body portion 21. Further, since the lock ring 10 is provided with the notch 24, the strength of the lock ring 10 does not become too high. Thereby, the force F required to expand the diameter of the lock ring 10 at the time of pipe joining is reduced, and the labor for expanding the diameter of the lock ring 10 is reduced.

  In order to stabilize the mounting posture of the lock ring 10, it is preferable to increase the width W of the lock ring 10 in the tube axis direction. Even in this case, the diameter of the lock ring 10 is increased as described above. The effort of is reduced.

  Thereafter, one end portion of the base portion 17 of the seal member 7 is fitted into the second recess 32 of the spacer 11, and in this state, the seal member 7 and the spacer 11 are fitted to the insertion port 5, and the spacer 11 is inserted into the insertion projection. 9 is moved to the detaching direction A side of the insertion slot 5 to be externally fitted to the engagement part 22 of the lock ring 10, and the seal member 7 is positioned on the outer peripheral side of the insertion slot protrusion 9. At this time, by inserting the insertion projection 9 into the first recess 18 of the seal member 7, the seal member 7 can be easily positioned on the outer peripheral side of the insertion projection 9.

At this time, the compression member 16 of the seal member 7 is set so as to fall within the range from the distal end of the insertion slot 5 to the insertion projection 9.
Thereafter, the bolt 28 and the nut 29 are tightened, and the insertion port 5 is inserted into the receiving port 4 while pushing the seal member 7 with the pusher wheel 8 through the spacer 11.
When the seal member 7 is pushed into the receiving port 4 in this way, one end portion of the seal member 7 is fitted into the second recess 32 of the spacer 11, so that one end portion of the seal member 7 is excessively increased in the diameter increasing direction. It is possible to prevent deformation (movement). Thereby, when joining the pipes 2 and 3, one end portion of the seal member 7 is not sandwiched between the end face of the flange 6 of the receiving port 4 and the spacer 11, as shown in FIGS. 1 and 2. The spacer 11 can push the seal member 7 with a sufficient force. For this reason, the seal member 7 is securely inserted between the inner peripheral surface of the receiving port 4 and the outer peripheral surface of the insertion port 5, The sealing performance of 7 can be kept good.

Further, when the insertion port 5 is inserted into the receiving port 4, as shown in FIG. 11, the compression portion 16 of the seal member 7 is set so as to fall within the range from the distal end of the insertion port 5 to the insertion projection 9. For this reason, the compression portion 16 is sandwiched between the distal end of the insertion port 5 and the inner end 35 in the receiving port 4 (see FIG. 12), and the seal member 7 is sufficiently received by the receiving port 4. It is possible to prevent the occurrence of a mounting failure (see FIG. 13) that cannot be inserted into the inside.
(Second Embodiment)
The second embodiment will be described below. The same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 14, the first recess 18 of the seal member 7 has a stepped portion 19 that faces the end surface of the base 17 from the inner peripheral surface of the first recess 18 over the entire periphery. The inner diameter d2 of the stepped portion 19 is formed larger than the inner diameter d1 of the first recess 18.

  As shown in FIG. 15, the second recess 32 of the spacer 11 has an outer peripheral surface 33 and an inner peripheral surface 34 that face each other in the radial direction. The inner diameter d5 of the second recess 32 is larger than the inner diameter d6 of the spacer 11, and the outer diameter D1 of the second recess 32 is smaller than the outer diameter D of the spacer 11.

  As shown in FIGS. 16 and 17, the end portion of the base portion 17 of the seal member 7 is fitted in the second recess 32 of the spacer 11, and at this time, the inner peripheral edge portion 11 a of the spacer 11 is the base portion 17 of the seal member 7. Is fitted into the stepped portion 19.

  According to this, as shown in FIG. 18, when the seal member 7 is pushed into the receiving port 4, one end portion of the seal member 7 is fitted into the second recess 32 of the spacer 11, so Can be prevented from being excessively deformed (moved) in the tube diameter direction (the diameter expansion direction and the diameter reduction direction). Thus, when joining the pipes 2 and 3, one end of the seal member 7 is not sandwiched between the end face of the flange 6 of the receiving port 4 and the spacer 11, and the spacer 11 is sealed with sufficient force. As shown in FIG. 16, the sealing member 7 is securely inserted between the inner peripheral surface of the receiving port 4 and the outer peripheral surface of the insertion port 5, and the sealing performance of the sealing member 7 is good. Can be kept in.

  In each of the above embodiments, as shown in FIG. 4, the lock ring 10 is formed with a plurality of cut portions 24 (thinning portions). However, the present invention is not limited to this. The part 24 may not be provided.

  In each of the above embodiments, as shown in FIG. 1, the spacer 11 is sandwiched between the press wheel 8 and the receiving port 4, and a predetermined gap 31 is provided between the press wheel 8 and the flange 6 of the receiving port 4. However, the present invention is not limited to this, and the spacer 11 is not provided, and the pusher wheel 8 and the flange 6 of the receiving port 4 are separated from each other. May be in contact with each other. Alternatively, a protrusion may be provided on one of the press wheel 8 and the flange 6 of the receiving port 4, and the protrusion may be in contact with either the press wheel 8 or the flange 6 of the receiving port 4. Good.

  The embodiment described above is merely a specific example of the present invention, and the scope of the present invention is not limited by the description, and can be appropriately modified and designed within the range where the effects of the present invention are exhibited.

DESCRIPTION OF SYMBOLS 1 Pipe joint 2 One pipe 3 The other pipe 4 Receptacle 5 Insert 7 Seal member 8 Push ring 9 Insert protrusion 10 Lock ring (detachment prevention member)
11 Spacer 16 Compression part 18 First recess 21 Ring body part (detachment prevention body part)
22 Engaging portion 32 Second recess A Insertion detachment direction B Insertion direction

Claims (6)

The insertion port formed in the other tube is inserted into the interior of the receiving port formed in one tube,
An annular seal member is provided in the gap between the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port,
A push ring that pushes the seal member to the back side of the receiving port is fitted to the insertion port and faces the opening end of the receiving port from the outside,
The insertion opening has an insertion protrusion on the outer periphery,
A separation preventing member that engages with the insertion protrusion in the tube axis direction and prevents the insertion opening from being removed from the receiving opening is provided between the inner periphery of the push wheel and the outer periphery of the insertion opening.
The seal member has a compression portion that is sandwiched between the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port and is compressed in the pipe diameter direction, and is located on the outer periphery of the insertion port protrusion.
A pipe joint characterized in that the compression part of the seal member is located on the back side of the receiving port with respect to the insertion protrusion. On the inner periphery of the seal member, a first recess is formed in which the insertion protrusion protrudes from the insertion direction of the insertion opening,
2. The pipe joint according to claim 1, wherein the first concave portion is present on the side of the insertion direction of the insertion opening with respect to the compression portion of the seal member in the pipe axis direction. The detachment prevention member is an annular member having a one-piece structure with one portion cut off, and is associated with the detachment prevention main body portion provided between the inner periphery of the pusher wheel and the outer periphery of the insertion port, and the insertion port protrusion. An engaging portion that can be mated,
The engaging part protrudes from the separation preventing main body part in the insertion direction of the insertion opening,
3. The pipe joint according to claim 1, wherein a thickness of the engaging portion in the pipe radial direction is thinner than a thickness of the separation preventing main body portion in the pipe radial direction. The engaging portion enters the first recess of the seal member from the insertion direction of the insertion opening,
The pipe joint according to claim 3, wherein the insertion protrusion is located between the compression part of the seal member and the engagement part of the separation preventing member in the pipe axis direction. A spacer is provided between the seal member and the push ring,
The seal member is pushed to the back side of the receiving port by a push ring through a spacer,
The spacer has a second recess on the side in contact with the seal member,
The pipe joint according to any one of claims 1 to 4, wherein one end of the seal member is fitted in the second recess of the spacer. A pipe joining method using the pipe joint according to any one of claims 1 to 5,
The press ring is externally fitted to the insertion opening, and moved from the insertion protrusion to the detachment direction side of the insertion opening,
The detachment preventing member is externally fitted to the insertion opening and moved to the detachment direction side of the insertion opening from the insertion opening protrusion, and is arranged between the inner periphery of the push wheel and the outer periphery of the insertion opening,
The seal member is externally fitted to the insertion port, and is positioned on the outer periphery of the insertion port protrusion.
A method for joining pipes, wherein an insertion port is inserted into a receiving port while pushing a seal member with a push ring.

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