JP6735124B2 - Pipe fitting and separation prevention member - Google Patents

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

The lock ring 103 is a split annular member that is 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 during pipe connection. As described above, the diameter-expanding tool 106 is inserted from the opening side of the receiving opening 101 along the inner surface of the receiving opening, and the tip 106a is inserted into the split portion of the lock ring 103 to increase the diameter r of the lock ring 103. Is accommodated in the circumferential groove 102 of the receiving port 101 so that the insertion projecting portion 105 can pass through.

After the insertion protrusion 105 has passed through the lock ring 103, the diameter-expanding tool 106 is removed from the lock ring 103 to reduce the diameter r of the lock ring 103 that has been increased in diameter, as shown in FIG. The lock ring 103 is fitted onto the insertion opening 104 and held around the outer circumference of the insertion opening 104. In the figure, 107 is a rubber ring for sealing, 108 is a push ring, and 109 is a fastening bolt.

According to this, as shown in FIG. 24, when the insertion opening 104 tries to come out of the receiving opening 101, the insertion opening projection 105 engages with the lock ring 103, while the lock ring 103 has the circumferential groove 102. It is designed to prevent slipping out by engaging with the inner surface of the.

At this time, a force that twists outward in the radial direction Z and tends to fall acts on the lock ring 103, which may make the mounting posture of the lock ring 103 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.

The above-mentioned pipe joint is described in, for example, Patent Document 1 below.

JP 2004-232679 A

However, in the above-mentioned conventional type, when the width W of the lock ring 103 is increased, the strength of the lock ring 103 becomes too high, and when the pipe is connected, the insertion port 104 is inserted into the receiving port 101 as shown in FIG. However, a large force is required to increase the diameter r of the lock ring 103 by the diameter expanding tool 106, which requires time and labor for expanding the diameter of the lock ring 103 and takes time for pipe joining work.

It is an object of the present invention to provide a pipe joint and a separation preventing member that can join pipes 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 spout has a spout protrusion on the outer periphery,
A detachment prevention member that prevents the insertion opening from coming off the receiving opening is externally fitted to the insertion opening,
The separation prevention member is an annular member having a one-piece structure in which one place is cut, and has an annular main body portion and an engaging portion ,
The main body portion has one end surface formed on the insertion direction side of the insertion opening and another end surface formed on the removal direction side of the insertion opening,
The engaging portion is provided on one end surface of the main body portion and protrudes from the one end surface of the main body portion in the insertion direction of the insertion opening.
Wall thickness in the pipe diameter direction of the engagement portion is rather thin than the thickness in the pipe diameter direction of the main body,
The outer diameter of the engaging portion is smaller than the outer diameter of the main body,
The disengagement prevention member has a step on the outer circumference thereof in the pipe radial direction formed by the outer peripheral surface of the main body and the outer peripheral surface of the engaging portion,
The insertion opening protrusion is engageable with the engagement portion of the separation prevention member from the direction of separation of the insertion opening .

According to this, when joining one pipe and the other pipe, the diameter of the separation prevention member is enlarged (diameter expansion), and the separation prevention member is externally fitted to the insertion opening from the tip of the insertion opening, After passing through the part, move it toward the removal direction side of the insertion opening from the insertion opening projection, and then reduce the diameter of the expansion prevention member that has been expanded (reduce diameter), and remove the removal prevention member from the insertion opening. Hold it around the outside.

Since the thickness of the engaging portion of the detachment prevention member is smaller than the thickness of the main body portion, the strength of the detachment prevention member does not become too high, and the force required to expand the diameter of the detachment prevention member at the time of pipe joining. Is reduced, the labor for expanding the detachment preventing member is reduced, and the pipe joining work can be performed in a short time.

After joining the one pipe and the other pipe in this way, even if the detaching force acts on the inserting mouth due to an earthquake or the like, the inserting mouth protrusion engages with the engaging portion of the detachment preventing member from the detaching direction. This can prevent the insertion opening from coming off the receiving opening.

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

In the pipe joint according to the second aspect of the present invention, an annular seal member is provided in a gap between the outer peripheral surface of the insertion opening and the inner peripheral surface of the receiving opening.
A push ring that pushes the seal member toward the rear 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 compressed in the pipe radial direction by being sandwiched between the outer peripheral surface of the insertion opening and the inner peripheral surface of the reception opening, and is located on the outer periphery of the insertion opening projection.
The compression portion of the seal member is located on the far side of the receiving opening from the insertion opening protruding portion,
The separation prevention member is provided between the inner circumference of the push wheel and the outer circumference of the insertion opening.

According to this, in the state where the pipes are joined to each other through the pipe joint, the seal member is located on the outer periphery of the insertion protrusion, so that the position of the seal member and the position of the insertion protrusion are in the pipe radial direction. Overlap, and the length from the tip of the insertion opening to the projection of the insertion opening is shortened. As a result, the length from the opening end of the receiving port to the innermost end in the receiving port can be shortened, and the pipe joint can be downsized in the pipe axis direction.

In the pipe joint according to the third aspect of the invention, when the engagement portion of the separation preventing member is oriented in the pipe axis direction in the opposite direction from the normal orientation, the gap between the receptacle and the push ring can be set to a predetermined gap. It cannot be done.
According to this, when the engagement prevention member is mistakenly turned over and the removal prevention member is externally fitted to the insertion opening, the interval between the receiving opening and the push wheel cannot be set to a predetermined interval, so the operator Can immediately recognize that the separation prevention member is in the opposite direction, and can correct the separation prevention member to the normal orientation.

In the pipe joint according to the fourth aspect of the present invention, the separation preventing member is provided with a thinned portion for facilitating the deformation in the radial direction .

According to this, by providing the thinned portion, the strength of the separation preventing member does not become too high, and the force required for expanding the separation preventing member at the time of pipe joining is further reduced. The labor of the work is reduced and the pipe joining work can be performed in a short time.

In the fifth invention, the insertion opening formed in the other tube is inserted inside the receiving opening formed in the one tube,
In a pipe joint in which the insertion opening has an insertion opening protrusion on the outer peripheral portion, a removal prevention member provided for preventing the insertion opening from coming off the receiving opening,
It is an annular member with a one-piece structure cut at one location,
A main body part that can be externally fitted to the insertion opening, and an engagement part ,
The main body has one end surface facing the insertion direction of the insertion opening, and the other end surface facing the removal direction of the insertion opening,
The engaging portion projects from one end surface of the main body portion in the insertion direction of the insertion opening, and is engageable with the insertion opening protrusion from the removal direction side of the insertion opening,
Wall thickness in the pipe diameter direction of the engagement portion is rather thin than the thickness in the pipe diameter direction of the main body,
The outer diameter of the engaging portion is smaller than the outer diameter of the main body,
The outer circumference has a step in the pipe radial direction formed by the outer circumference of the main body and the outer circumference of the engaging portion .

According to this, since the thickness of the engagement preventing portion of the separation preventing member is smaller than the thickness of the main body portion, the strength of the separation preventing member does not become excessively high, whereby the separation preventing member is expanded in diameter at the time of pipe joining. The force required for this is reduced, the labor for expanding the detachment prevention member is reduced, and the pipe joining work can be performed in a short time.

As described above, according to the present invention, since the thickness of the engagement preventing portion of the separation preventing member is smaller than the thickness of the main body portion, the strength of the separation preventing member does not become too high. When joining the pipes, the force required to expand the diameter of the separation preventing member is reduced, the labor for expanding the separation preventing member is reduced, and the pipe joining work can be performed in a short time.

It is a sectional view of a pipe joint in a 1st embodiment of the present invention. FIG. 3 is a partially enlarged sectional view of the pipe joint. FIG. 3 is a cross-sectional view of a seal member of the pipe joint, showing a shape in a natural state where the seal member is not attached to the pipe joint. FIG. 3 is a view of a lock ring of the pipe joint of the same. It is a XX arrow line view in FIG. FIG. 3 is a view of the push ring of the pipe joint. It is a XX arrow line view in FIG. FIG. 3 is a view of a spacer of the pipe joint. It is a XX arrow line view in FIG. FIG. 3 is a partially enlarged cross-sectional view of the spacer of the pipe joint. FIG. 6 is a cross-sectional view showing a method of joining pipes together using the pipe joint. It is a reference drawing which shows an example of a mounting failure when joining pipes using a pipe joint. It is a reference drawing which shows another example of mounting failure when joining pipes using a pipe joint. It is sectional drawing of the lock ring of the pipe coupling in the 2nd Embodiment of this invention. FIG. 3 is a sectional view of a push ring of the pipe joint. FIG. 3 is a sectional view of the pipe joint, showing a state in which the lock ring is set in a regular direction. FIG. 3 is a sectional view of the pipe joint, showing a state in which the lock ring is set in the opposite 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. FIG. 3 is a sectional view of the spacer of the pipe joint. FIG. 3 is a sectional view of the pipe joint. FIG. 3 is a partially enlarged sectional view of the pipe joint. FIG. 6 is a cross-sectional view showing a method of joining pipes together using the pipe joint. Of the pipe joint according to the fourth embodiment of the present invention. It is sectional drawing of the conventional pipe joint. FIG. 7 is a cross-sectional view showing a procedure for joining pipes using the pipe joint of the same.

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

An annular seal member 7 is provided in the gap between the outer peripheral surface of the insertion opening 5 and the inner peripheral surface of the receiving opening 4, and a push wheel 8 that pushes the seal member 7 toward the rear side of the receiving opening 4 is externally fitted to the insertion opening 5. And 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 port 5 has an insertion port projection 9 on the entire outer circumference. Further, a lock ring 10 (an example of a detachment prevention member) that engages with the insertion opening projection 9 in the tube axis direction and prevents the insertion opening 5 from coming off the receiving opening 4 is externally fitted to the insertion opening 5. ing. A spacer 11 is provided between the seal member 7 and the push ring 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 protrusion 9. FIG. 3 is a cross-sectional view showing a shape in a natural state where 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 which becomes a tip when being pushed into the receiving port 4. The compression section 16 and the base section 17 formed in the direction of approaching the push ring 8 from the compression section 16. The base portion 17 is made of rubber harder than the compression portion 16.

As shown in FIGS. 1 and 2, the compression portion 16 is located on the inner side of the receiving opening 4 with respect to the insertion opening projection 9 and is sandwiched between the inner peripheral surface of the receiving opening 4 and the outer peripheral surface of the insertion opening 5. Are compressed in the pipe radial direction.
The outer periphery of the base portion 17 is formed in a tapered shape whose diameter increases in the detaching direction A of the insertion slot 5. On the inner circumference of the base portion 17, a first concave portion 18 into which the insertion opening projection 9 enters from the insertion direction B of the insertion opening 5 is formed. The first recessed portion 18 is located closer to the detaching direction A side of the insertion port 5 than 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 FIG. 1, FIG. 2, FIG. 4, and FIG. 5, the lock ring 10 is an annular metal member having a split structure in which one location is cut. It 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 is engageable with the insertion opening projection portion 9 in the pipe axis direction. The engaging portion 22 projects from the ring main body portion 21 in the insertion direction B of the insertion opening 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 opening 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 wall thickness T1 of the engaging portion 22 in the pipe radial direction is the wall thickness of the ring main body 21 in the pipe radial direction. It is thinner than T2. The inner diameter d7 of the engagement portion 22 is the same as the inner diameter d7 of the ring body portion 21, and the outer diameter D2 of the engagement portion 22 is smaller than the outer diameter D3 of the ring body portion 21.

Further, since the lock ring 10 has a split structure, an external force F for enlarging the cut portion 23 of the lock ring 10 is applied by using a dedicated diameter-expanding tool as shown by a virtual line in FIG. As a result, the inner diameter of the lock ring 10 can be expanded (expanded), and by removing the external force F as described above, 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 expanding the diameter of the lock ring 10, a diameter expander 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 the deformation in the radial direction.

As shown in FIGS. 1 and 2, the insertion protrusion 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 pipe axis direction.
As shown in FIGS. 6 and 7, the push ring 8 is an annular member and has an inner peripheral portion with a fitting portion 25 into which the ring body portion 21 of the lock ring 10 is fitted and an inclined surface 26. ing. The inner diameter d3 of the fitting portion 25 is larger than the inner diameter d4 of the pressing wheel 8, and the inclined surface 26 is formed between the inner peripheral surface 8a of the pressing wheel 8 and the inner peripheral surface 25a of the fitting portion 25, and It is inclined so that the diameter increases as it is inserted in the insertion direction B, and as shown in FIGS. 1 and 2, it abuts on the corner portion between the end surface and the outer peripheral surface of the ring body portion 21 of the lock ring 10.

As shown in FIG. 1, the pressing 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 pressing wheel 8 and the receiving port 4. As a result, the gap between the push ring 8 and the flange 6 of the receiving port 4 is set to a predetermined gap 31 (regular gap), and the push ring 8 and the flange 6 of the receiving port 4 are separated via the spacer 11. ..

The seal member 7 is pushed to the inner side of the receiving port 4 by the push wheel 8 via the 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. The outer peripheral surface 33 of the second recess 32 is inclined so that the diameter increases in the insertion direction B of the insertion slot 5. As shown in FIGS. 1 and 2, the end of the base 17 of the seal member 7 is fitted into the second recess 32 of the spacer 11.

In addition, the engagement 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 peripheral surface of the insertion port 5. It goes 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 fitted onto the insertion slot 5 and moved toward the detaching direction A side of the insertion slot 5 with respect to the insertion slot projection 9. Next, as shown by the phantom line in FIG. 4, a state in which a dedicated diameter-expanding tool is engaged with the groove 36 of the lock ring 10 to exert an external force F on the lock ring 10 to increase the inner diameter of the lock ring 10. Then, it is fitted onto the insertion opening 5 from the tip of the insertion opening 5, passes through the insertion opening projection 9 and is moved toward the detaching direction A side of the insertion opening 5 with respect to the insertion opening projection 9, and then the diameter expander. Is removed from the lock ring 10, and the diameter of the expanded lock ring 10 is reduced (reduced in diameter), as shown by the solid line in FIG. 4, and the lock ring 10 is clung to the outer periphery of the insertion slot 5. As shown in FIG. 11, the ring main body 21 of the lock ring 10 is fitted into the fitting portion 25 of the push ring 8 and is arranged 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, in the lock ring 10, the engaging portion 22 has a wall thickness T1 smaller 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 ring 10 does not become too high, so that the force F required to expand the diameter of the lock ring 10 at the time of pipe joining is reduced, and the work of expanding the diameter of the lock ring 10 is reduced.

After that, as shown in FIG. 11, one end of the base 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 externally fitted to the insertion opening 5, 11 is moved to the detaching direction A side of the insertion opening 5 from the insertion opening projection 9 to be fitted onto the engagement portion 22 of the lock ring 10, and the seal member 7 is attached to the outer peripheral side of the insertion opening projection 9. Position it. At this time, by inserting the insertion opening projection 9 into the first recess 18 of the sealing member 7, the sealing member 7 can be easily positioned on the outer peripheral side of the insertion opening projection 9.

At this time, the compression portion 16 of the seal member 7 is set so as to fall within the range from the tip of the insertion opening 5 to the insertion opening projection 9.
After that, the bolt 28 and the nut 29 are tightened, and the insertion port 5 is inserted into the receiving port 4 while pressing the seal member 7 with the push ring 8 via the spacer 11.

When the seal member 7 is pushed into the receiving port 4 in this manner, 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 expanded in the radial direction. It can be prevented from being deformed (moved). Thus, when the pipes 2 and 3 are joined together, 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 is Can press the seal member 7 with a sufficient force. Therefore, the seal member 7 can be 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 inserting the insertion port 5 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 tip of the insertion port 5 to the insertion port protrusion 9. Therefore, the compression portion 16 is not properly mounted (see FIG. 12) such that the compression portion 16 is sandwiched between the tip of the insertion opening 5 and the inner end 35 in the receiving opening 4, and the sealing member 7 is sufficiently received. It is possible to prevent the occurrence of mounting failure (see FIG. 13) such that the device cannot be inserted inside.

The joining work of the pipes 2 and 3 as described above can be performed in a short time because the force F required for expanding the diameter of the lock ring 10 is reduced and the work for expanding the diameter of the lock ring 10 is reduced.
As shown in FIG. 1, in a state in which the two pipes 2 and 3 are joined to each other via the pipe joint 1, the compression portion 16 of the seal member 7 is located at the back side of the receiving port 4 with respect to the insertion projecting portion 9. It is sandwiched between the inner peripheral surface of 4 and the outer peripheral surface of the insertion port 5 and compressed in the pipe radial direction, so that the space between the receiving port 4 and the insertion port 5 is sealed, and the water (fluid 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 inner side of the receiving port 4 by the push wheel 8 via the spacer 11, the sealing member 7 is pushed 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 detaching force is applied to the insertion slot 5 due to an earthquake or the like, the insertion slot projection 9 is engaged with the engaging portion 22 of the lock ring 10 in the detachment direction A, so that the insertion slot 5 is separated from the receiving slot 4. It is possible to prevent separation.

In order to stabilize the mounting posture of the lock ring 10, it is preferable to increase the total width W2 (see FIG. 5) of the lock ring 10 in the tube axis direction. Since the labor of expanding the diameter of 10 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 sealing member 7 and the position of the insertion port projection 9 overlap in the pipe radial direction, and The length L1 to the insertion protrusion 9 is shortened. As a result, the length L2 from the opening end of the receiving port 4 to the rear end 35 in the receiving port 4 can be shortened, and the pipe joint 1 can be downsized in the pipe axis direction.

In addition, as shown in FIGS. 1 and 2, the engagement 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 opening 5 from the insertion direction B of the insertion opening 5. Since it is inserted in the space, one end portion of the seal member 7 (that is, the end portion that is in contact with the spacer 11) is unlikely to be deformed inward in the pipe radial direction, and the shape of the base portion 17 of the seal member 7 is stable. It is possible to prevent a decrease in sealing property (watertightness).

Further, as shown in FIGS. 6 and 7, since the push ring 8 is an annular member having no divided structure, the strength of the push ring 8 can be increased and the cost can be reduced.
Further, as shown in FIG. 5, in the lock ring 10, the wall thickness T1 of the engaging portion 22 is set to 1/5 or more and 1/2 or less of the wall thickness T2 of the ring body portion 21. Is preferred. In this way, the strength of the engaging portion 22 can be secured by setting it to 1/5 or more, and the force required to expand the diameter of the lock ring 10 at the time of pipe joining by setting it to 1/2 or less. F can be reduced.

Further, it is preferable that the width W1 of the engaging portion 22 in the tube axis direction is set to 1/5 or more and 1/2 or less of the total width W2 of the lock ring 10. In this way, by setting it to 1/5 or more, the force F required to expand the diameter of the lock ring 10 at the time of pipe joining can be reduced, and by setting it to 1/2 or less, the engagement portion 22 The strength can be secured.

(Second embodiment)
Below, 2nd Embodiment is described based on FIGS. 14-17. The same members as those in the first embodiment described above are designated by the same reference numerals, and detailed description thereof will be 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 that the diameter increases in the insertion direction B of the insertion slot 5. Similarly, the inner peripheral surface 25a of the fitting portion 25 of the push wheel 8 is also inclined so that the diameter increases in the insertion direction B of the insertion slot 5.

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

Further, as shown in FIG. 17, when the direction of the engaging portion 22 is mistakenly set to the opposite direction from 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 interval between the push ring 8 and the flange 6 of the receiving port 4 is set to be larger than the predetermined interval 31 without being fitted into 25. 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 designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 18, the first recess 18 of the seal member 7 has a stepped portion 19 facing the end surface of the base 17 from the inner peripheral surface of the first recess 18 over the entire circumference. 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. It fits into the stepped portion 19 of.

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 pipe radial direction (diameter expansion direction and diameter reduction direction). Thereby, when joining the pipes 2 and 3, the one end of the seal member 7 is not sandwiched between the end surface 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 can be reliably inserted between the inner peripheral surface of the receiving port 4 and the outer peripheral surface of the insertion port 5 to maintain good sealing performance of the sealing member 7. You can
(Fourth Embodiment)
The fourth embodiment will be described below with reference to FIG. The same members as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 23, an annular seal member 7 is provided in the gap between the outer peripheral surface of the insertion opening 5 and the inner peripheral surface of the receiving opening 4, and the push ring 61 directly connects the sealing member 7 to the inner side of the receiving opening 4. Pushing to the side.
A groove 62 is formed over the entire circumference on the inner peripheral surface at the back of the receiving port 4. A lock ring 10 that prevents the insertion opening 5 from coming off the receiving opening 4 is externally fitted to the insertion opening 5 and fits in the groove 62.

According to this, even if a detaching force acts on the insertion slot 5 due to an earthquake or the like, the insertion slot projection 9 engages with the engaging portion 22 of the lock ring 10 from the detachment direction A, and thus the insertion slot 5 receives the receiving slot. It is possible to prevent separation from No. 4.

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

In addition, in each of the above-described embodiments, as shown in FIG. 4, the lock ring 10 is formed with a plurality of cutout portions 24 (thinning portions), but the present invention is not limited to this, and the cutout portions are not limited thereto. The part 24 may not be provided.

Further, in each of the above-described embodiments, as shown in FIG. 1, the spacer 11 is sandwiched between the push ring 8 and the receiving port 4, and a predetermined gap 31 is provided between the push ring 8 and the flange 6 of the receiving port 4. Is formed and the pressing wheel 8 and the flange 6 of the receiving port 4 are separated from each other via the spacer 11, but the present invention is not limited to this, and the spacer 11 is not provided, and the pressing wheel 8 and the flange 6 of the receiving port 4 are not provided. And may abut. Alternatively, a configuration may be adopted in which a protrusion is provided on either one of the push wheel 8 and the flange 6 of the receiving port 4 and the protrusion contacts the other of the pressing wheel 8 and the flange 6 of the receiving port 4. Good.

The embodiment described above is only one 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 in which the operation and effect of the present invention are exhibited.

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 (separation prevention member)
16 Compressor 21 Ring body (body)
22 Engagement Part 24 Notch Part (Thickness Reduction Part)
31 Predetermined interval 61 Pushing ring B Insertion direction T1 Thickness of engaging portion in radial direction of tube T2 Thickness of ring body in radial direction of tube

Claims (5)

A pipe joint in which an insertion opening formed in the other pipe is inserted inside a receiving opening formed in one pipe,
The spout has a spout protrusion on the outer periphery,
A detachment prevention member that prevents the insertion opening from coming off the receiving opening is externally fitted to the insertion opening,
The separation prevention member is an annular member having a one-piece structure in which one place is cut, and has an annular main body portion and an engaging portion ,
The main body portion has one end surface formed on the insertion direction side of the insertion opening and another end surface formed on the removal direction side of the insertion opening,
The engaging portion is provided on one end surface of the main body portion and protrudes from the one end surface of the main body portion in the insertion direction of the insertion opening.
Wall thickness in the pipe diameter direction of the engagement portion is rather thin than the thickness in the pipe diameter direction of the main body,
The outer diameter of the engaging portion is smaller than the outer diameter of the main body,
The disengagement prevention member has a step on the outer circumference thereof in the pipe radial direction formed by the outer peripheral surface of the main body and the outer peripheral surface of the engaging portion,
The pipe joint, wherein the insertion opening projection is engageable with the engagement portion of the separation prevention member from the direction of separation of the insertion opening . An annular seal member is provided in the gap between the outer peripheral surface of the insertion opening and the inner peripheral surface of the receiving opening,
A push ring that pushes the seal member toward the rear 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 compressed in the pipe radial direction by being sandwiched between the outer peripheral surface of the insertion opening and the inner peripheral surface of the reception opening, and is located on the outer periphery of the insertion opening projection.
The compression portion of the seal member is located on the far side of the receiving opening from the insertion opening protruding portion,
The pipe joint according to claim 1, wherein the separation prevention member is provided between the inner circumference of the push ring and the outer circumference of the insertion opening. When the orientation of the engagement portion of the detachment prevention member is opposite to the regular orientation in the tube axis direction, the gap between the receptacle and the push ring cannot be set to a predetermined gap. The pipe joint according to 2 . The pipe joint according to any one of claims 1 to 3, wherein the separation preventing member is provided with a thinned portion for facilitating deformation in the radial direction . Inside the receiving opening formed in one tube, the insertion opening formed in the other tube is inserted,
In a pipe joint in which the insertion opening has an insertion opening protrusion on the outer peripheral portion, a removal preventing member provided for preventing the insertion opening from coming off the receiving opening,
It is an annular member with a one-piece structure cut at one location,
A main body part that can be externally fitted to the insertion opening, and an engagement part ,
The main body portion has one end surface facing the insertion direction of the insertion opening and another end surface facing the removal direction of the insertion opening,
The engaging portion projects from one end surface of the main body portion in the insertion direction of the insertion opening, and is engageable with the insertion opening protrusion from the removal direction side of the insertion opening,
Wall thickness in the pipe diameter direction of the engagement portion is rather thin than the thickness in the pipe diameter direction of the main body,
The outer diameter of the engaging portion is smaller than the outer diameter of the main body,
A detachment prevention member having a step in the pipe radial direction formed on the outer peripheral surface of the main body and the outer peripheral surface of the engaging portion .

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