JP5312181B2 - Detachment prevention fitting and lock ring centering member - Google Patents

Description

  The present invention relates to a detachment prevention pipe joint and a lock ring centering member, and in particular, a slip-on type detachment prevention pipe joint capable of joining the receiving opening and the insertion opening by inserting the insertion opening into the receiving opening, and the separation prevention. The present invention relates to a lock ring centering member used for a pipe joint.

  Slip-on type pipe joints are configured so that a sealing material is attached to the inner periphery of the receiving opening, and the insertion opening is inserted into the receiving opening while the sealing material is compressed to join the receiving opening and the insertion opening. ing. As such a slip-on type pipe joint provided with a detachment prevention function, a detachment prevention pipe joint having the structure shown in FIG. 6 or a detachment prevention pipe joint having the structure shown in FIGS. 7 and 8 (see Patent Document 1). Is already known.

  As shown in FIGS. 6 and 7, an annular seal material 23 is disposed in the seal material accommodation groove 22 on the inner periphery of the receiving port 21, and the lock ring accommodation groove 24 is located behind the seal material accommodation groove 22. Is formed, and a lock ring 25 divided in one circumferential direction is attached to the lock ring receiving groove 24. A rubber lock ring centering member 26 for holding and centering the lock ring 25 is disposed between the outer peripheral side of the lock ring 25 and the inner peripheral side of the lock ring receiving groove 24. Yes. An insertion projection 28 that can engage with the back side of the lock ring 25 from the back of the receiving port is formed on the outer periphery of the distal end of the insertion port 27.

  In the case of the one shown in FIG. 6, the lock ring centering member 26 has a rectangular cross section and is disposed so as to contact the inner peripheral surface and the rear side surface 24 b of the lock ring groove 24. Press inward. In the case of the ones shown in FIGS. 7 and 8, rubbers having a structure in which protrusions 26a protruding to the inner periphery are formed at predetermined intervals are used, and these protrusions 26a are the outer periphery of the lock ring 25. The structure is configured to press against a surface. The lock ring 25 is elastically expanded by the insertion protrusion 28 when the insertion opening 27 is inserted, and allows the insertion protrusion 28 to pass through the interior of the lock ring 25 and the like. Even when the insertion port 27 is going to move away from the receiving port 21 later, due to the engagement between the lock ring 25 and the insertion projection 28, the lock ring 25 is opened to the receiving port of the lock ring receiving groove 24. The insertion port 27 is configured to be able to prevent the insertion port 27 from coming off from the receiving port by contacting the tapered inner peripheral surface 24a formed on the side.

  Here, the lock ring centering member 26 of the separation preventing fitting shown in FIG. 6 has a structure in which the lock ring 25 is centered simply by the elastic force of the lock ring centering member 26, so that the centering is good. In some cases, the lock ring 25 is eccentric with respect to the lock ring receiving groove 24 and the insertion of the insertion opening 27 becomes difficult. What has been invented to cope with this problem is the separation preventing pipe joint having the structure shown in FIGS. That is, as shown in FIGS. 7 and 8A, the lock ring centering member 26 is formed with protrusions 26a protruding inward at every predetermined interval, so that these protrusions 26a are locked. It can abut on the outer peripheral surface of the ring 25 and can be pressed in a well-centered state. As shown in FIG. 8B, when the projection 26a of the lock ring centering member 26 is fitted into the split gap 25a of the split lock ring 25, the centering position is shifted and the center As shown in FIG. 8 (a), since the alignment state becomes poor, the operator should be careful not to enter the posture in which the projection 26a does not enter the split gap 25a of the lock ring 25, or the lock ring centering member. 26 postures are moved and assembled.

  By the way, a plurality of projecting portions projecting radially inward are formed on the inner peripheral surface of the receiving port 21, and in the case of the separation preventing pipe joint shown in FIG. Three projecting portions projecting radially inward are formed. That is, a receiving port opening end protruding portion 29 protruding inward in the radial direction is formed between the end surface of the receiving port 21 where the opening is provided and the sealing material accommodation groove 22. The part 29 prevents the sealing material 23 from being separated toward the receiving opening when the insertion opening 27 moves in the separating direction. In addition, an accommodating groove protruding portion 30 protruding radially inward is formed between the sealing material accommodating groove 22 and the lock ring accommodating groove 24 in the receiving port 21, and the accommodating groove protruding portion 30 is inserted into the receiving groove 21. The seal member 23 is prevented from being detached from the seal material receiving groove 22 toward the receiving port when the port is inserted, and the lock ring 25 is detached from the lock ring receiving groove 24 to the receiving port side when the inserting port 27 is moved in the removing direction. To stop doing. In addition, at the back side of the lock ring receiving groove 24 in the receiving port 21 (the portion forming the back side surface 24b of the lock ring receiving groove 24), a receiving port back side protruding portion 31 protruding radially inward is formed. The back end protrusion 31 of the receiving port prevents the lock ring 25 from being detached from the lock ring receiving groove 24 to the back side of the receiving port when the insertion port is inserted.

  In the case of the detachment prevention pipe joint shown in FIG. 7, the receiving port rear side protruding wall portion 32 following the wall surface forming the back side surface 24b of the lock ring receiving groove 24 has the receiving prevention pipe joint shown in FIG. The same function and effect as the mouth-out side protruding portion 31 is exhibited.

  Here, the outlet opening end protrusion 29, the inter-groove protrusion 30, and the outlet rear side protrusion 31 (or the receiver rear side protruding wall part 32) are respectively inserted into the insertion protrusion 28 during insertion. Is formed with a common diameter dimension that is slightly larger than the diameter of the insertion projection 28, and as described above, the sealing material 23 when the insertion port is inserted or when the insertion port 27 moves in the direction of removal. The lock ring 25 is prevented from being detached. Therefore, at the time of insertion of the insertion opening, the pipes connected to each other are connected in a state where the axial centers of the pipes are matched with each other very accurately.

Japanese Patent No. 2703150

  However, as described above, in the conventional detachment prevention pipe joint, when the insertion is inserted, the shaft centers of the pipes to be connected to each other must be connected in a very accurate state. Therefore, it takes a lot of time and effort to make the pipes coincide with each other, resulting in a reduction in work efficiency in the connection work between the pipes.

  As a method of coping with this, the position of the protruding end on the radially inner side of the receiving port opening end protruding portion 29 and the receiving port back side protruding portion 31 (or the receiving port back side protruding wall portion 32) is projected between the receiving grooves. In other words, the inner diameters of the receiving opening end protruding portion 29 and the receiving port rear side protruding portion 31 are set to be larger than those of the protruding portion 30 between the receiving grooves. It is conceivable to configure it to be larger than the inner diameter. If this configuration is adopted, the insertion port 27 is inserted in a state where the axis of the insertion port 27 is bent and displaced with respect to the axis of the reception port 21 around the location where the receiving groove projection 30 is provided in the reception port 21. The port 27 can be swung, and the flexibility of the connection state is widened. In addition, when inserting the insertion port, the axes of the pipes connected to each other are not accurately matched, that is, the axis of the pipes Since the pipes can be connected even in a bent state, the work efficiency at the time of pipe connection can be improved.

  However, if the inner diameter of the receiving-portion rear-side protruding portion 31 is larger than the inner diameter of the inter-groove protruding portion 30, the lock-ring 25 is received from the lock-ring receiving groove 24 when the insertion port is inserted by the receiving-port-side protruding portion 31. There is a risk that it will not be possible to prevent separation from the back of the mouth.

  Further, when the separation preventing pipe joint shown in FIG. 7 is used, it is possible to prevent the centering from becoming poor as in the case where the separation preventing pipe joint shown in FIG. 6 is used. However, for that purpose, the lock ring centering member 26 is in the posture shown in FIG. 8A, that is, the lock ring centering member is formed in the split gap 25 a of the split lock ring 25. 26. While the operator is careful so that the protrusion 26a of 26 is not fitted, the posture of the lock ring centering member 26 is moved, that is, the person manages the posture of the lock ring centering member 26. However, since it has to be assembled, this has taken time and effort, leading to a reduction in work efficiency.

  The present invention solves the above-mentioned problem, and while maintaining a good separation preventing function, the pipes can be connected even in a state where the pipe axes are bent, and the posture of the lock ring centering member can be changed. An object of the present invention is to provide a detachment prevention pipe joint and a lock ring centering member capable of satisfactorily centering a lock ring without management.

  In order to solve the above-mentioned problem, the separation preventing pipe joint according to the present invention has an insertion port formed at the end of the other tube inserted into the reception port formed at the end of one tube, An annular seal material is disposed in the seal material accommodation groove formed on the inner periphery, a lock ring accommodation groove is formed on the back side of the seal material accommodation groove in the receiving port, and the lock ring accommodation groove has a circumferential direction. A split ring is provided, and a lock ring centering member for holding and centering the lock ring is disposed between the inner peripheral surface of the lock ring receiving groove and the outer peripheral surface of the lock ring. The lock ring can be elastically expanded at the outer periphery of the distal end of the insertion port so that the inside of the lock ring can be passed to the back side of the receiving port. An insertion projection that can be engaged from the back of the receptacle is formed The inner diameter of the protruding portion between the receiving grooves formed between the sealing material receiving groove and the lock ring receiving groove at the receiving port and protruding inward in the radial direction of the receiving port The inner diameter of the protrusion on the inner side of the receiving port that protrudes inward in the radial direction of the receiving port is formed to be large, and the annular sealing material is compressed between the receiving port and the inserting port. The anti-separation pipe joint configured to be sealed between the lock ring centering member and disposed between the inner peripheral surface of the lock ring receiving groove and the outer peripheral surface of the lock ring. A holder portion that holds the lock ring from the outer peripheral side, and protrudes inward in the radial direction of the receiving port from the receiving port back side portion of the holder unit, and the back side surface of the lock ring receiving groove and the back side surface of the lock ring Between the two and A hooking part that prevents the lock ring from being detached from the lock ring receiving groove by being caught by the cling is formed, and the hooking part and the holder part are divided into a plurality of parts in the circumferential direction. The outer peripheral surfaces of the outer ring are elastically deformable and extend outward in contact with the inner peripheral surface of the lock ring receiving groove so that the divided portions can be urged radially inward of the receiving port. However, an enlarged-diameter connecting portion that is connected in a state of being movable in the radial direction of the receiving port is formed.

  With the above configuration, the inner diameter of the protruding part on the rear side of the receiving port is formed larger than the inner diameter of the protruding part between the receiving grooves, so that the pipes can be connected to each other even when the pipe axes are bent. Since the catching part is formed on the take-out member, it is prevented that the catching part is caught on the lock ring and the lock ring is detached from the lock ring receiving groove when the insertion port is inserted. It can be maintained well. Further, the lock ring centering member is divided into a plurality of parts in the circumferential direction, and the divided parts can be biased radially inward of the receiving port by the enlarged diameter connecting part. The lock ring is well centered by the alignment member. Moreover, since the diameter expansion connection part is the shape extended outside in the attitude | position which can be elastically deformed from each outer peripheral surface of a division | segmentation part, a diameter expansion connection part fits in the division | segmentation clearance gap part of a 1-part lock ring. Therefore, it is not necessary to manage the posture in the circumferential direction of the lock ring centering member with respect to the lock ring.

  Moreover, the enlarged diameter connection part of this invention is extended in each circular arc shape from each outer peripheral surface of a division | segmentation part, It is characterized by connecting the division | segmentation parts. With this configuration, although it is a relatively simple configuration that extends in an arc shape, each of the divided portions can be favorably biased radially inward of the receiving port, and thus the lock ring can be centered satisfactorily.

  Further, the catching margin of the lock ring centering member of the present invention is such that the radially inner end of the lock ring centering member is disposed in the centering state in the lock ring receiving groove, and the rear end of the receiving portion is It is characterized by being formed in a dimension that protrudes radially inward from the inner diameter portion.

  With the above configuration, the hooking portion of the lock ring centering member is radially inward of the end of the portion extending radially inward of the receiving port in the centering state than the inner diameter of the protruding portion on the back side of the receiving port. Therefore, the lock ring at the time of insertion insertion is compared with a configuration in which the end portion of the hooking margin portion is in a radially outer side than the inner diameter portion of the protrusion on the back side of the receiving port in a centered state. Can be more reliably prevented.

  In the lock ring centering member of the present invention, the insertion port formed at the end of the other tube is inserted into the receiving port formed at the end of one tube, and the inner periphery of the receiving port is inserted. An annular seal material is arranged in the formed seal material accommodation groove, and a lock ring divided by one in the circumferential direction is arranged in the lock ring accommodation groove formed on the back side of the seal material accommodation groove in the receiving port. And a lock ring centering member for holding and centering the lock ring is disposed between the inner peripheral surface of the lock ring receiving groove and the outer peripheral surface of the lock ring. A lock ring centering member used in a release prevention pipe joint configured such that a seal between the receiving openings is performed by compressing an annular sealing material between the lock ring receiving grooves, Arranged between the peripheral surface and the outer peripheral surface of the lock ring And a holder portion that holds the lock ring from the outer peripheral side, and protrudes inward in the radial direction of the receiving port from the inner side of the receiving port of the holder unit, and the inner side of the lock ring receiving groove and the inner side of the locking ring. A catching margin part is formed to enter between the side surface and prevent the lock ring from being detached from the lock ring receiving groove when the insertion slot is inserted, and the catch margin part and the holder part are Divided into a plurality of directions, the outer peripheral surfaces of the divided portions are extended outward in an elastically deformable posture and come into contact with the inner peripheral surface of the lock ring receiving groove. A diameter-expanded connection portion is formed to connect in a state where the portion can be urged radially inward of the receiving port and movable in the radial direction of the receiving port.

  According to the present invention, since the inner diameter of the protruding part on the rear side of the receiving port is formed larger than the inner diameter of the protruding part between the housing grooves, the pipes can be connected to each other even in a state where the tube axis centers are bent. Although the work efficiency can be improved at the same time, the lock ring centering member is formed with a catching margin so that the lock ring can be reliably prevented from detaching from the lock ring receiving groove, and the detachment prevention function is good. To improve reliability. Further, by energizing the receiving port in the radial direction by the enlarged diameter connecting portion, the lock ring can be centered satisfactorily by the lock ring centering member, and the enlarged diameter connecting portion has each outer peripheral surface of the divided portion. Therefore, it is not necessary to manage the posture in the circumferential direction of the lock ring centering member with respect to the lock ring, and the work efficiency at this time can be improved. .

It is a longitudinal cross-sectional view of the separation preventing pipe joint according to the embodiment of the present invention. It is a principal part expanded longitudinal cross-sectional view of the separation prevention pipe joint. It is a front view of the lock ring centering member of the separation preventing pipe joint. It is a perspective view of the member for lock ring centering of the separation prevention pipe joint. It is a front view which shows the state which made the lock ring fit to the member for lock ring centering of the same detachment prevention pipe joint. It is a longitudinal cross-sectional view of the conventional detachment prevention pipe joint. It is a longitudinal cross-sectional view of another conventional detachment prevention pipe joint. (A), (b) is a front view which shows the state which fitted the lock ring to the member for lock ring centering of the separation prevention pipe joint, respectively.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a separation preventing pipe joint according to an embodiment of the present invention, and FIG. 2 is an enlarged longitudinal sectional view of a main part of the separation preventing pipe joint.
In FIG. 1, 1 is a receiving port formed at the end of one tube, 7 is an insertion port formed at the end of the other tube, and when the tubes are connected to each other, FIG. As shown, an insertion slot 7 is inserted into the receptacle 1.

  Further, an annular sealing material 3 is disposed in the sealing material accommodation groove 2 formed in the inner periphery of the receiving port 1, and a lock ring accommodation groove 4 is formed on the back side of the sealing material accommodation groove 2. A lock ring 5 divided in one circumferential direction is mounted in the lock ring receiving groove 4. Between the outer peripheral side of the lock ring 5 and the inner peripheral side of the lock ring housing groove 4, a resin lock ring centering member 6 for holding and centering the lock ring 5 is disposed. . Further, on the outer periphery of the distal end portion of the insertion opening 7, the lock ring 5 can be elastically expanded when the insertion opening 7 is inserted, and the inside of the lock ring 5 can be passed to the back side of the receiving opening 1. After the passage, an insertion projection 8 is formed in the lock ring 5 that can be engaged from the back side of the receptacle 1. The annular sealing material 3 is compressed between the receiving port 1 and the insertion port 7 so that the sealing between the receiving port insertion ports is performed. In addition, an inclined surface is formed at the tip of the insertion projection 8 so as to become thinner toward the tip of the insertion port 7. An inclined surface is formed so as to spread toward the opening side. When the insertion opening is inserted, the inclined surface at the tip of the insertion protrusion 8 and the inclined surface of the lock ring 5 are brought into sliding contact with each other so that the diameter of the lock ring 5 is increased.

  As shown in FIGS. 1 and 2, three projecting portions projecting radially inward are formed on the inner peripheral surface of the receiving port 1. That is, a receiving port opening end protrusion 9 is formed between the end surface of the receiving port 1 where the opening is provided and the sealing material receiving groove 2 and protrudes radially inward. The portion 9 prevents the sealing material 3 from being detached toward the receiving opening when the insertion opening 7 moves in the separating direction. Further, an inter-groove protrusion 10 that protrudes radially inward is formed between the sealing material-accommodating groove 2 and the lock ring accommodating groove 4 in the receiving port 1. The seal material 3 is prevented from being detached from the seal material receiving groove 2 to the back side of the receiving port when the port is inserted, and the lock ring 5 is detached from the lock ring receiving groove 4 to the receiving port side when the insertion port 7 is moved in the separating direction. To stop doing. Moreover, the receiving port back side protrusion part 11 which protrudes in the radial inside also in the back side location (the part which makes the back side surface 4b (refer FIG. 2) of the lock ring receiving groove 4) of the lock ring receiving groove 4 in the receiving port 1. The receiving-portion-side protrusion 11 prevents the lock ring 5 from being detached from the lock-ring receiving groove 4 to the receiving-port side when the insertion port is inserted.

  Here, the opening opening protrusion 9 of the receiving opening, the protruding part 10 between the receiving grooves, and the protruding part 11 on the back side of the receiving opening are respectively inserted into the insertion protrusion 8 so that the insertion protrusion 8 can be inserted when the insertion is inserted. It is formed with a diameter dimension larger than the diameter. More specifically, the positions of the protruding ends on the radially inner side of the opening opening protrusion 9 on the receiving opening and the protruding part 11 on the rear side of the receiving hole are larger than the positions of the protruding ends on the radially inner side of the protruding part 10 between the receiving grooves. In other words, the inner diameters of the receiving port rear side protruding portion 11 and the receiving port opening end protruding portion 9 are larger than the inner diameter of the inter-groove protruding portion 10. And by comprising in this way, the axial center of the insertion port 7 bends and shifts | deviates with respect to the axial center of the receiving port 1 centering on the location in which the accommodating groove | channel protrusion part 10 in the receiving port 1 is provided. In this state, the insertion port 7 can be swung to increase the flexibility of the connection state, and the axes of the pipes connected to each other are not exactly aligned when the insertion port is inserted. The tubes can be connected to each other even in a state in which the shaft centers are bent.

  However, if the inner diameter of the receiving-portion rear projection 11 is larger than the inner diameter of the inter-groove protrusion 10, the lock ring 5 is received from the lock-ring receiving groove 4 when the insertion port is inserted by the receiving port-side protrusion 11. There is a risk that it will not be possible to prevent separation from the back of the mouth.

  As shown in FIGS. 1 to 4, in the separation preventing pipe joint of the present invention, the inner peripheral surface of the lock ring receiving groove 4 and the lock ring are provided on the lock ring centering member 6 so as to prevent such a problem. A holder portion 6a that is disposed between the outer peripheral surface of the holder 5 and holds the lock ring 5 from the outer peripheral side, and protrudes inward in the radial direction of the receiving port 1 from the inner side of the receiving port of the holder portion 6a. It protrudes between the back side surface of the accommodation groove 4 and the back side surface of the lock ring 5, and is caught by the back side surface of the lock ring 5 when the insertion port is inserted, so that the lock ring 5 is detached from the lock ring accommodation groove 4. A catching margin 6b is formed to prevent this. In addition, the hook allowance portion 6b and the holder portion 6a are divided into a plurality of portions in the circumferential direction, and the outer circumferential surfaces of the divided portions 6c extend outwardly in an arc shape in an elastically deformable posture. Abutting on the inner peripheral surface of the housing groove 4, the divided portions 6 c are connected to each other in a state in which the divided portions 6 c can be urged radially inward of the receiving port 1 and movable in the radial direction of the receiving port 1. An enlarged diameter connecting portion 6d is formed. In the present embodiment, the lock ring centering member 6 is made of a resin such as polypropylene or 6 nylon, and the entire lock ring centering member 6, that is, the holder portion 6a and the catching margin portion 6b are expanded. The diameter connecting portion 6d is integrally formed. Although FIGS. 1 to 4 show the case where the enlarged diameter connecting portion 6d is formed to have the same width as the holder portion 6a, the present invention is not limited to this and may be narrower than the holder portion 6a. .

  Further, in the present embodiment, as shown in an enlarged view in FIG. 2, the hooking margin portion 6b of the lock ring centering member 6 has a radially inner end portion 6b 'positioned in the lock ring receiving groove. When arranged in the extended state, it is formed to have a dimension that protrudes radially inward of the receiving port 1 from the inner diameter portion of the receiving port rear side protruding portion 11.

  The diameter expansion connecting portion 6d is thinner than the holder portion 6a, and the maximum outer diameter of the lock ring centering member 6 on which the diameter expansion connecting portion 6d is formed is the inner circumference of the lock ring receiving groove 4. It is formed to be approximately the same as the diameter. As described above, when the lock ring centering member 6 is formed of polypropylene, nylon 6 or the like, the thickness of the holder portion 6a is 2 to 5 mm, and the thickness of the enlarged diameter connection portion 6d is 0.5 to 0.5 mm. Although 1.5 mm is preferable, the present invention is not limited to this, and the lock ring 5 can be centered satisfactorily by the elastic force of the enlarged diameter connecting portion 6d, and the enlarged diameter connecting portion 6d is flexed appropriately at the time of joining pipes. That's fine.

  According to the said structure, since the internal diameter of the receiving port back | inner side protrusion part 11 is formed larger than the internal diameter of the protrusion part 10 between accommodating grooves, even if the pipe shaft centers are bent, pipes can be connected favorably. It is possible to improve the work efficiency at the time of pipe connection. Further, since the catching allowance 6b is formed in the lock ring centering member 6, the catch allowance 6b may be caught by the lock ring 5 when the insertion slot is inserted, and the lock ring 5 may be detached from the lock ring receiving groove 4. As a result, the separation preventing function can be maintained well and the reliability is improved. Further, the catching margin 6b of the lock ring centering member 6 has an end portion extending radially inward of the receiving port in a radially inner side than the inner diameter portion of the protruding portion on the rear side of the receiving port in the centering state. Therefore, the lock ring at the time of insertion insertion is compared with a configuration in which the end portion of the hooking margin portion is in a radially outer side than the inner diameter portion of the protrusion on the back side of the receiving port in a centered state. Can be more reliably prevented. In addition, although the inner diameter of the opening opening end projection 9 is larger than the conventional one, the sealing material 3 has a large allowance for the sealing material accommodation groove 2, so there is almost no possibility of separation from the sealing material accommodation groove 2. Absent.

  Further, according to the above configuration, the lock ring centering member 6 is divided into a plurality of parts in the circumferential direction, and the divided part 6c is received by the enlarged diameter connecting part 6d at least when the diameter of the lock ring is increased. The lock ring 5 is centered satisfactorily by the lock ring centering member 6. Moreover, since the diameter expansion connection part 6d is the shape extended outside in the attitude | position which can be elastically deformed from each outer peripheral surface of the division | segmentation part 6c, it is the diameter expansion connection part in the division | segmentation clearance gap part 5a of the one-part lock ring 5. 6d does not fit. Therefore, it is not necessary to manage the posture of the lock ring centering member 6 with respect to the lock ring 5 in the circumferential direction, and the work efficiency at this time can be improved.

  Further, since the diameter-expanded connection portion 6d is formed in a shape extending in an arc shape from each outer peripheral surface of the divided portion 6c, each divided portion 6c can be satisfactorily arranged in the radial direction of the receiving port 1 with a relatively simple configuration. Therefore, the lock ring 5 can be centered satisfactorily.

  3 to 5 show a case where the number of divisions of the holder portion 6a and the hooking allowance portion 6b of the lock ring centering member 6 is eight, the present invention is not limited to this. In addition, by integrally molding the lock ring centering member 6 with resin, there is an advantage that the manufacturing cost can be reduced compared to a conventional rubber lock ring centering member, but this is not restrictive. .

  Moreover, in said embodiment, the case where the part in the back | inner side of the receiving port back side protrusion part 11 in the receiving port 1 is formed so that the internal diameter may spread rather than the receiving port back side protrusion part 11 is described. In this case, the insertion projection 8 is preferable because it can swing in the radial direction. However, the present invention is not limited to this. The shape (shape of the receiving port shown in FIG. 7) continuing to the back end of the mouth may be used.

DESCRIPTION OF SYMBOLS 1 Receptacle 2 Sealing material accommodation groove 3 Sealing material 4 Lock ring accommodation groove 5 Lock ring 6 Lock ring centering member 6a Holder part 6b Engagement part 6c Dividing part 6d Expanding connection part 7 Insertion 8 Insertion protrusion 9 Receptor opening end protrusion 10 Recess between receiving grooves 11 Receptor rear side protrusion

Claims (4)

The insertion opening formed at the end of the other tube is inserted into the interior of the receiving port formed at the end of one tube,
An annular sealing material is disposed in the sealing material accommodation groove formed on the inner periphery of the receiving port,
A lock ring housing groove is formed on the back side of the sealing material housing groove in the receiving port,
The lock ring housing groove is provided with a circumferentially divided lock ring,
Between the inner peripheral surface of the lock ring housing groove and the outer peripheral surface of the lock ring, a lock ring centering member that holds and centers the lock ring is disposed,
The lock ring can be elastically expanded on the outer periphery of the distal end of the insertion port to allow the lock ring to pass through the interior of the lock ring to the back side of the insertion port. An insertion projection that can be engaged from the back side is formed,
From the inner diameter of the protruding portion between the receiving grooves formed between the sealing material receiving groove and the lock ring receiving groove at the receiving port and protruding inward in the radial direction of the receiving port, The inner diameter of the protruding part on the rear side of the receiving port that protrudes inward in the radial direction of the receiving port is formed,
A detachment prevention pipe joint configured such that a seal between the receiving opening is performed by compressing an annular sealing material between the receiving opening and the inserting opening,
The lock ring centering member is provided with a holder portion disposed between an inner peripheral surface of the lock ring receiving groove and an outer peripheral surface of the lock ring to hold the lock ring from the outer peripheral side, and a receiving portion of the holder portion. Projects inward in the radial direction of the receiving port from the back side of the mouth, enters between the back side surface of the lock ring receiving groove and the back side surface of the lock ring, and locks by being caught by the lock ring when the insertion port is inserted. A hook margin is formed to prevent the ring from detaching from the lock ring receiving groove,
The catching margin part and the holder part are divided into a plurality in the circumferential direction,
The outer circumferential surface of each of the divided portions extends outward in an elastically deformable posture and abuts against the inner peripheral surface of the lock ring receiving groove, and the divided portions are arranged on the radially inner side of the receiving port. A detachment prevention fitting having a diameter expansion connecting portion formed to be connected in a state of being movable in the radial direction of the receiving port while being urged.   2. The separation preventing pipe joint according to claim 1, wherein the enlarged diameter connecting portion extends in an arc shape from each outer peripheral surface of the divided portion and connects the divided portions.   The hooking margin of the lock ring centering member has a diameter that is larger than the inner diameter portion of the protruding portion on the rear side of the receiving port when the radially inner end thereof is disposed in the centering state in the lock ring receiving groove. The separation preventing pipe joint according to claim 1 or 2, wherein the joint is formed to have a dimension protruding inward in the direction. An insertion port formed at the end of the other tube is inserted into the interior of the receiving port formed at the end of one tube, and an annular sealing material is inserted into the sealing material receiving groove formed at the inner periphery of the receiving port. The lock ring receiving groove formed on the back side of the seal material receiving groove at the receiving port is provided with a circumferentially divided lock ring, and the inner peripheral surface of the lock ring receiving groove and the A lock ring centering member for holding and centering the lock ring is disposed between the lock ring and the outer peripheral surface of the lock ring, and the ring seal material is compressed between the receiving port and the insertion port to receive the lock ring. A lock ring centering member used in a separation preventing pipe joint configured to be sealed between the mouth insertion holes,
A holder portion that is disposed between the inner peripheral surface of the lock ring receiving groove and the outer peripheral surface of the lock ring and holds the lock ring from the outer peripheral side, and the diameter of the receiving port from the receiving back side portion of the holder portion It protrudes inward in the direction and enters between the back side surface of the lock ring receiving groove and the back side surface of the lock ring. When the insertion port is inserted, the lock ring is caught by the lock ring and detached from the lock ring receiving groove. A catching part is formed to prevent this,
The catching margin part and the holder part are divided into a plurality in the circumferential direction,
The outer circumferential surface of each of the divided portions extends outward in an elastically deformable posture and abuts against the inner peripheral surface of the lock ring receiving groove, and the divided portions are arranged on the radially inner side of the receiving port. A lock ring centering member characterized in that an enlarged diameter connecting portion is formed to be connected in a state of being movable in the radial direction of the receiving port while being able to be biased.

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