JP2017180474A - Pipe joint and removal prevention member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint enabling a pipe connecting work to be carried out in a short time.SOLUTION: An insertion port 5 has an insertion port protrusion part 9 at its outer peripheral part, a removal prevention member 10 for preventing the insertion port 5 from being removed from the receiving port 4 is outwardly fitted to the insertion port 5, the removal prevention member 10 is an annular member having a split structure cut at its one location, and has a main body part 21 and an engagement part 22 that can be engaged with the insertion port protrusion 9 in a pipe axis direction, the engagement part 22 is protruded from the main body part 21 in an inserting direction B of the insertion port 5 and a wall thickness of the engagement part 22 in its pipe diameter direction is thinner than a wall thickness of the main body part 21 in its pipe diameter direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe joint used for joining pipes and a separation preventing member provided in the pipe joint.

  Conventionally, as this type of pipe joint, for example, as shown in FIG. 24, a lock ring 103 is disposed in the circumferential groove 102 on the inner surface of the receiving port 101, while an insertion projection 105 is provided in the insertion port 104, A pipe joint 100 that prevents the insertion opening 104 from coming out by engaging the insertion protrusion 105 with a lock ring 103 is known.

  The lock ring 103 is a single-piece annular member cut at one location, and is shown in FIG. 25 so that the lock ring 103 does not get in the way when the insertion port 104 is inserted into the receiving port 101 when the tube is connected. In this way, the diameter expanding tool 106 is inserted along the inner surface of the receiving port 101 from the opening side of the receiving port 101, the tip 106 a is inserted into the split portion of the locking ring 103, and the diameter r of the locking ring 103 is increased. Is inserted into the circumferential groove 102 of the receiving port 101 so that the insertion projection 105 passes therethrough.

  After the insertion projection 105 has passed through the lock ring 103, the diameter r of the lock ring 103 that has been expanded is reduced by removing the diameter expanding tool 106 from the lock ring 103, as shown in FIG. The lock ring 103 is externally fitted to the insertion opening 104 and hung around the outer periphery of the insertion opening 104. In the figure, 107 is a rubber band for sealing, 108 is a push wheel, and 109 is a fastening bolt.

  According to this, as shown in FIG. 24, when the insertion port 104 is about to come out of the receiving port 101, the insertion port protrusion 105 is engaged with the lock ring 103, while the lock ring 103 is in the circumferential groove 102. By engaging with the inner surface of the cover, it is possible to prevent the slipping out.

  At this time, there is a possibility that the lock ring 103 is subjected to a force that tends to be twisted in the radially outward direction Z to fall, and the mounting posture of the lock ring 103 becomes unstable. On the other hand, in order to stabilize the mounting posture of the lock ring 103, it is preferable to increase the width W of the lock ring 103 in the tube axis direction.

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

JP 2004-232679

  However, in the above conventional type, if the width W of the lock ring 103 is increased, the strength of the lock ring 103 becomes too high, and when the tube 104 is connected, the insertion port 104 is inserted into the receiving port 101 as shown in FIG. In addition, a large force is required to increase the diameter r of the lock ring 103 by the diameter expanding tool 106, and there is a problem that it takes time to expand the diameter of the lock ring 103 and it takes time to join the pipes.

  It is an object of the present invention to provide a pipe joint and a detachment preventing member that can perform pipe joining work in a short time.

In order to achieve the above object, the first invention is a pipe joint in which an insertion opening formed in the other pipe is inserted inside a receiving opening formed in one pipe,
The insertion opening has an insertion protrusion on the outer periphery,
A separation preventing member that prevents the insertion opening from being removed from the receiving opening is externally fitted to the insertion opening,
The separation preventing member is an annular member having a one-piece structure with one portion cut, and has a main body portion and an engagement portion that can be engaged with the insertion protrusion in the tube axis direction.
The engaging part protrudes from the main body part in the insertion direction of the insertion slot,
The thickness of the engaging portion in the tube diameter direction is thinner than the thickness of the main body portion in the tube diameter direction.

  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.

  Since the separation preventing member has a thinner engagement portion than the main body, the strength of the separation preventing member does not become too high, and thus the force required to expand the separation preventing member during pipe joining. Is reduced, the labor for expanding the diameter of the separation preventing member is reduced, and the pipe joining work can be performed 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 second invention, 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 externally fitted to the insertion port and faces the opening end of the receiving port from the outside,
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 the seal member is located on the back side of the receiving opening from the insertion protrusion,
The separation preventing member is provided between the inner periphery of the push ring and the outer periphery of the insertion opening.

  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 third aspect of the present invention, the separation preventing member is provided with a thinned portion for facilitating deformation in the diameter increasing direction.
According to this, the strength of the separation preventing member does not become excessively high due to the provision of the reduced thickness portion, and the force required to expand the separation preventing member during pipe joining is further reduced, and the diameter of the separation preventing member is increased. The labor of the work 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, when the direction of the engaging portion of the separation preventing member is set in the direction opposite to the normal direction in the pipe axis direction, the interval between the receiving port and the push ring is set to a predetermined interval. Is not possible.

  According to this, when the direction of the engaging portion is reversed and the separation preventing member is externally fitted to the insertion port, the interval between the receiving port and the press ring cannot be set to a predetermined interval. Can immediately recognize that the separation preventing member is in the reverse direction, and can correct the separation preventing member in the normal direction.

In the fifth aspect of the present invention, an insertion port formed in the other tube is inserted into the interior of the receiving port formed in one tube,
In the pipe joint in which the insertion opening has an insertion protrusion on the outer peripheral portion, a separation preventing member provided to prevent the insertion opening from being separated from the receiving port,
It is an annular member with a one-piece structure with one part cut,
It has a main body portion that can be externally fitted to the insertion opening, and an engagement portion that can be engaged with the insertion protrusion in the tube axis direction,
The engaging part protrudes from the main body part in the insertion direction of the insertion slot,
The thickness of the engaging portion in the tube diameter direction is thinner than the thickness of the main body portion in the tube diameter direction.

  According to this, since the thickness of the engaging portion of the separation preventing member is thinner than the thickness of the main body portion, the strength of the separation preventing member does not become too high, thereby expanding the diameter of the separation preventing member during pipe joining. The force required for this is reduced, the labor of expanding the diameter of the separation preventing member is reduced, and the joining operation of the pipes can be performed in a short time.

  As described above, according to the present invention, the separation preventing member has a thickness of the engaging portion that is thinner than the thickness of the main body portion, so that the strength of the separation preventing member does not become too high. When joining the pipe, the force required to expand the detachment prevention member is reduced, and the labor for expanding the detachment prevention member is reduced, so that the pipe can be joined in a short time.

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 lock ring of the pipe joint in the 2nd Embodiment of this invention. It is sectional drawing of the push ring of a pipe joint similarly. It is sectional drawing of a pipe joint and shows the state which set the lock ring in the regular direction. It is sectional drawing of a pipe joint and shows the state which set the lock ring in the reverse direction. It is sectional drawing of the sealing member of the pipe joint in the 3rd 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. The pipe joint according to the fourth embodiment of the present invention It is sectional drawing of the conventional pipe joint. It is sectional drawing which shows the joining procedure of the pipes using a pipe joint similarly.

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. 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 externally fitted to the insertion port 5. ing. 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 main body portion) fitted between the outer periphery of 5 and an engagement portion 22 that can be engaged with the insertion projection 9 in the tube axis direction. 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.

  The cross-sectional shape of the ring main body 21 and the cross-sectional shape of the engaging portion 22 are each quadrangular, and the thickness T1 of the engaging portion 22 in the pipe radial direction is the thickness of the ring main body 21 in the pipe radial direction. Thinner than T2. The inner diameter d7 of the engaging portion 22 is the same as the inner diameter d7 of the ring main body portion 21, and the outer diameter D2 of the engaging portion 22 is smaller than the outer diameter D3 of the ring main body portion 21.

  Further, since the lock ring 10 has a one-piece structure, an external force F that causes the cutting portion 23 of the lock ring 10 to expand 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, the interval between the push wheel 8 and the flange 6 of the receiving port 4 is set to a predetermined interval 31 (regular interval), and the push 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, a method of 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, a dedicated diameter expanding tool is engaged with the groove 36 of the lock ring 10 to apply an external force F to the lock ring 10, and the lock ring 10 is expanded in inner diameter. Then, it is externally fitted to the insertion port 5 from the tip of the insertion port 5, is passed through the insertion port projection 9, is moved from the insertion port projection 9 toward the detaching direction A side of the insertion port 5, and then the diameter expanding tool 4 is removed from the lock ring 10, and the diameter of the lock ring 10 that has been enlarged is reduced (reduced) as shown by the solid line in FIG. 4, and the lock ring 10 is held around the outer periphery of the insertion slot 5. As shown in FIG. 11, the ring main body portion 21 of the lock ring 10 is fitted into the fitting portion 25 of the push ring 8 and is disposed between the inner circumference of the push ring 8 and the outer circumference of the insertion slot 5.

  As shown in FIGS. 4 and 5, the lock ring 10 has a thickness T1 of the engaging portion 22 smaller than a thickness T2 of the ring main body portion 21, and further, the lock ring 10 is provided with a notch 24. The strength of the ring 10 does not become excessively high, thereby reducing the force F required to expand the diameter of the lock ring 10 at the time of pipe joining, and the labor for expanding the diameter of the lock ring 10 is reduced.

  Thereafter, as shown in FIG. 11, one end 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 over the insertion slot 5, and the spacer 11 is moved to the detaching direction A side of the insertion port 5 from the insertion port projection 9 and is fitted on the engagement portion 22 of the lock ring 10, and the seal member 7 is moved to the outer peripheral side of the insertion port projection 9. Position. 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 pipe | tubes 2 and 3, one end part of the sealing member 7 is not pinched | interposed between the end surface of the receiving port 4, and the spacer 11, but as shown to FIG. 1, FIG. Can press 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 to seal the seal member 7. The performance 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.

The above-described joining operation of the pipes 2 and 3 can be performed in a short time by reducing the force F required to expand the diameter of the lock ring 10 and reducing the labor for expanding the diameter of the lock ring 10.
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 order to stabilize the mounting posture of the lock ring 10, it is preferable to increase the entire width W2 (see FIG. 5) of the lock ring 10 in the tube axis direction. Even in this case, as described above, Since the labor of the 10 diameter expansion work is reduced, the joining work of the pipes 2 and 3 can be performed in a short time.

  Further, since the seal member 7 is located on the outer peripheral side of the insertion port projection 9, the position of the seal member 7 and the position of the insertion port projection 9 overlap in the tube diameter direction, and from the distal end of the insertion port 5. The length L1 to the insertion 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.
Further, as shown in FIG. 5, in the lock ring 10, the wall thickness T <b> 1 of the engaging portion 22 is set to 1/5 or more and 1/2 or less with respect to the wall thickness T <b> 2 of the ring main body portion 21. Is preferred. Thus, by setting it to 1/5 or more, the strength of the engaging portion 22 can be secured, and by setting it to 1/2 or less, the force required to expand the diameter of the lock ring 10 at the time of pipe joining. F can be reduced.

  The width W1 of the engaging portion 22 in the tube axis direction is preferably set to 1/5 or more and 1/2 or less with respect to the total width W2 of the lock ring 10. Thus, by setting it to 1/5 or more, the force F required to expand the diameter of the lock ring 10 can be reduced at the time of pipe joining, and by setting it to 1/2 or less, Strength can be secured.

(Second Embodiment)
Below, 2nd Embodiment is described based on FIGS. 14-17. In addition, about the same member as the thing of the 1st Embodiment mentioned above, the same code | symbol is attached and detailed description is abbreviate | omitted.

  As shown in FIGS. 14 to 16, the outer peripheral surface 21 a of the ring main body 21 of the lock ring 10 is inclined so as to increase in diameter in the insertion direction B of the insertion slot 5. Similarly, the inner peripheral surface 25 a of the fitting portion 25 of the push wheel 8 is also inclined so as to increase in diameter in the insertion direction B of the insertion slot 5.

Hereinafter, the operation of the above configuration will be described.
As shown in FIG. 16, when the engaging portion 22 of the lock ring 10 is set in a normal direction in the tube axis direction, the ring main body portion 21 of the lock ring 10 is fitted into the fitting portion 25 of the push ring 8. Thus, the interval between the push wheel 8 and the flange 6 of the receiving port 4 is set to a predetermined interval 31.

In addition, as shown in FIG. 17, when the direction of the engagement portion 22 is mistakenly changed to the normal direction in the tube axis direction, the ring main body portion 21 of the lock ring 10 is inserted into the fitting portion of the push ring 8. The distance between the push wheel 8 and the flange 6 of the receiving port 4 is set to be larger than the predetermined distance 31. Thereby, the operator can immediately recognize that the lock ring 10 is in the reverse direction, and can correct the lock ring 10 to the normal direction.
(Third embodiment)
Below, 3rd Embodiment is described based on FIGS. 18-22. 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. 18, the first recess 18 of the seal member 7 has a stepped portion 19 that faces the end surface of the base portion 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. 19, 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. 20 and 21, the end portion of the base portion 17 of the seal member 7 is fitted into 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. 22, 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 that one end portion of the seal member 7 is inserted. Can be prevented from being excessively deformed (moved) in the tube diameter direction (the diameter expansion direction and the diameter reduction direction). Thereby, when joining the pipes 2 and 3, one end of the seal member 7 is not sandwiched between the end face of the receiving port 4 and the spacer 11, and the spacer 11 pushes the seal member 7 with sufficient force. As shown in FIG. 20, 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 to keep the sealing performance of the sealing member 7 good. Can do.
(Fourth embodiment)
Below, 4th Embodiment is described based on FIG. 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. 23, 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 the pusher wheel 61 directly connects the seal member 7 to the back of the receiving port 4. Pushing to the side.
A groove 62 is formed on the inner peripheral surface at the back of the receiving port 4 over the entire circumference. A lock ring 10 that prevents the insertion opening 5 from being detached from the receiving opening 4 is fitted over the insertion opening 5 and fitted into the groove 62.

  According to this, even if a detachment force is applied to the insertion slot 5 due to an earthquake or the like, the insertion slot 5 engages with the engagement part 22 of the lock ring 10 from the separation direction A, so that the insertion slot 5 is received. 4 can be prevented from leaving.

  In the fourth embodiment, as shown in FIG. 23, the depth from the inner peripheral opening end to the bottom surface of the groove 62 is constant, but the present invention is not limited to this, and the ring main body of the lock ring 10 Depending on the difference in thickness between the portion 21 and the engaging portion 22, the groove 62 may have two different depths.

  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)
16 Compression unit 21 Ring body (main body)
22 Engagement part 24 Notch part (thinning part)
31 Predetermined spacing 61 Press wheel B Insertion direction T1 Thickness T2 in the tube radial direction of the engaging portion Thickness in the tube radial direction of the ring main body portion

Claims (5)

A pipe joint in which an insertion port formed in the other pipe is inserted inside a receiving port formed in one pipe,
The insertion opening has an insertion protrusion on the outer periphery,
A separation preventing member that prevents the insertion opening from being removed from the receiving opening is externally fitted to the insertion opening,
The separation preventing member is an annular member having a one-piece structure with one portion cut, and has a main body portion and an engagement portion that can be engaged with the insertion protrusion in the tube axis direction.
The engaging part protrudes from the main body part in the insertion direction of the insertion slot,
A pipe joint characterized in that the thickness of the engaging part in the pipe radial direction is thinner than the thickness of the main body part in the pipe radial direction. 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 externally fitted to the insertion port and faces the opening end of the receiving port from the outside,
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 the seal member is located on the back side of the receiving opening from the insertion protrusion,
The pipe joint according to claim 1, wherein the separation preventing member is provided between the inner periphery of the push wheel and the outer periphery of the insertion opening. The pipe joint according to claim 1 or 2, wherein the separation preventing member is provided with a thinned portion for facilitating deformation in the diameter-expanding direction. The distance between the receiving port and the push ring cannot be set to a predetermined distance when the direction of the engaging portion of the separation preventing member is opposite to the normal direction in the tube axis direction. The pipe joint according to claim 2 or claim 3. The insertion port formed in the other tube is inserted into the interior of the receiving port formed in one tube,
In the pipe joint in which the insertion opening has an insertion protrusion on the outer peripheral portion, a separation preventing member provided to prevent the insertion opening from being separated from the receiving port,
It is an annular member with a one-piece structure with one part cut,
It has a main body portion that can be externally fitted to the insertion opening, and an engagement portion that can be engaged with the insertion protrusion in the tube axis direction,
The engaging part protrudes from the main body part in the insertion direction of the insertion slot,
A separation preventing member characterized in that the thickness of the engaging portion in the tube diameter direction is thinner than the thickness of the main body portion in the tube diameter direction.

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