JP2010270847A - Movement prevention means - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a movement prevention means capable of easily performing the work of engagement of an engagement part of an annular body with that of a socket end and locking to a spigot end by the locking part pressed by a pressing part. <P>SOLUTION: A pair of engagement parts, which prevents the separation of the annular body 4 and the socket end 6 in the direction of the axis of conduit by engaging with each other, are provided on the annular body 4 and the socket end 6. The engagement part of the socket end 6 is provided at a predetermined portion except inside the deep side in the direction of the axis of the conduit of an inner wall part 6f at the socket end 6. A pair of engagement parts is a pair of projections 4g, 6d each projecting in the radial direction formed on the annular body 4 and the socket end 6. By inserting the annular body 4 and the socket end 6 into each other in the direction of the axis of conduit holding the pair of projections 4g, 6d at different positions from each other in the circumferential direction and by rotating relatively the annular body 4 and the socket end 6 in the circumferential direction, the engagement of the pair of projections 4g, 6d with each other is made possible in the direction of the axis of conduit. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides a sealing member for sealing between the outer peripheral surface of the insertion portion of the insertion tube and the inner peripheral surface of the reception portion of the reception tube into which the insertion portion is inserted. In a pipe joint arranged on the inner side in the tube axis direction of the inner wall portion provided on the inner peripheral surface, a locking portion that locks to the outer peripheral surface of the insertion portion, and a press that presses the locking portion in the inner diameter direction And a movement preventing means that has an annular body that is provided at least in the circumferential direction in the insertion portion and that prevents the two portions from separating in the tube axis direction.

  Conventionally, as the movement preventing means, there are a receiving portion and an insertion portion of fluid pipes connected to each other, a sealing member attached in a watertight manner along a circumferential direction of the inner periphery of the receiving portion, and an inner periphery. An annular body that has a locking portion that locks into the mouth portion and is attached to the insertion portion and the receiving portion into which the insertion portion is inserted. One engaging part that bulges outward partly along the circumferential direction is formed, and the other engaging part is formed at the end part on the receiving part side of the annular body, respectively. The annular body is attached to the receiving portion where the insertion portion is inserted, and the engagement of the pair of engaging portions and the locking of the locking portion to the insertion portion are received. The mouth portion and the insertion portion are prevented from being separated from each other in the tube axis direction (see, for example, Patent Document 1).

JP 2007-292267 A (page 4, FIG. 2)

  However, in Patent Document 1, when the annular body is attached over the insertion portion and the receiving portion, the engagement of the pair of engagement portions and the engagement of the engagement portions with the insertion portion are performed. Since it is made at the same time, there is a problem that it is difficult to position the three bodies of the annular body, the insertion portion, and the receiving portion.

  The present invention has been made paying attention to such a problem, and the engagement between the engaging portion of the annular body and the engaging portion of the receiving portion, and the insertion by the engaging portion pressed by the pressing portion. It is an object of the present invention to provide a movement preventing means capable of easily performing a locking operation on a portion.

In order to solve the above problem, the movement preventing means of the present invention comprises:
A sealing member that seals between the outer peripheral surface of the insertion portion of the insertion tube and the inner peripheral surface of the reception portion of the reception tube into which the insertion portion is inserted is an inner peripheral surface of the reception portion. In the pipe joint arranged on the inner back side in the pipe axis direction of the inner wall portion provided in
At least a locking portion that locks to the outer peripheral surface of the insertion portion and a pressing portion that presses the locking portion in the inner diameter direction are provided in an annular shape that is integral with the insertion portion along the circumferential direction. A movement preventing means for preventing the two mouth portions from being separated in the tube axis direction,
The annular body and the receiving part are provided with a pair of engaging parts that engage with each other to prevent the annular body and the receiving part from separating in the tube axis direction. The engaging portion is provided at a predetermined location excluding the inner back side in the tube axis direction of the inner wall portion in the receiving portion,
The pair of engaging portions are a pair of projecting portions projecting in a radial direction from the annular body and the receiving port portion, respectively, and the pair of projecting portions are located at positions different from each other in the circumferential direction. The pair of projecting portions can be engaged with each other in the tube axis direction by inserting the mouth portion into the tube axis direction and relatively rotating the annular body and the receiving port portion in the circumferential direction. It is characterized by that.
According to this feature, the pair of engaging portions provided in the annular body and the receiving portion are provided at predetermined locations excluding the inner back side in the tube axis direction of the inner wall portion of the receiving portion where the sealing member is disposed. Since they are engaged with each other, there is no risk of affecting the sealing member that seals between the circumferential surfaces of the insertion portion and the receiving portion, and the insertion portion and the receiving portion are separated in the tube axis direction. In addition, it is possible to prevent the engagement between the pair of engaging portions with the receiving portion and the locking portion pressed against the pressing portion with respect to the insertion portion. It is possible to work easily by doing each. Further, the pair of engaging portions can be easily configured by a pair of projecting portions projecting in the radial direction from the annular body and the receiving portion, respectively. The pair of protrusions can be easily engaged with each other in the tube axis direction simply by rotating relative to each other.

The movement preventing means of the present invention includes
The protruding portion of the receiving portion is provided closer to the receiving tube end side than the inner wall portion on the inner peripheral surface of the receiving portion, and the protruding portion of the annular body includes the inner wall portion and the receiving portion. It is characterized in that it can move in the circumferential direction along a groove formed between it and the protruding portion.
According to this feature, the inner wall portion provided on the inner peripheral surface of the receiving portion is used, and the groove portion is formed between the protruding portion of the receiving portion, so that the receiving portion has a simple configuration and is annular. The body protrusion can be guided by the groove.

The movement preventing means of the present invention includes
The pair of protrusions have contact surfaces that extend along the circumferential direction and contact each other, and the corresponding contact surfaces are formed as inclined surfaces that are inclined toward the tube axis direction. Yes.
According to this feature, the contact surfaces of the pair of protrusions are formed as inclined surfaces that are inclined in the tube axis direction, so that a large area of the contact surface can be secured, and the annular body and the receiving port As a result of relative rotation in the circumferential direction with respect to the portion, separation in the tube axis direction is also required, and the protruding portions engaged with each other are difficult to come off.

The movement preventing means of the present invention includes
At least one of the annular body and the receiving portion is provided with a restraining portion that restrains the other projecting portion in the circumferential direction when the projecting portions are engaged with each other in a predetermined manner. It is said.
According to this feature, a state in which the protrusions are engaged with each other only by restraining the restraining part provided on at least one of the annular body and the receiving part in the circumferential direction of the other projecting part. can do.

It is a partially broken top view which shows the pipe joint in Example 1. FIG. It is AA sectional drawing of the pipe joint in FIG. It is a partially broken exploded plan view of a pipe joint. It is a top view which shows the movement to the receptacle part of an annular body. It is a top view which shows the state by which the protrusion part by the side of a cyclic | annular body and the protrusion part by the side of a receptacle are mutually latched. It is a top view which shows the state which the protrusion part by the side of an insertion part has contact | abutted at the front-end | tip part of the volt | bolt. It is a partially broken top view which shows the pipe joint in Example 2. FIG. It is a top view which shows the movement to the receptacle part of an annular body. It is a top view which shows the state by which the protrusion part by the side of a cyclic | annular body and the protrusion part by the side of a receptacle are mutually latched. It is a partially broken top view which shows the pipe joint in Example 3. FIG.

  The form for implementing the movement prevention means based on this invention is demonstrated below based on an Example.

  The movement preventing means according to the first embodiment will be described with reference to FIGS. Reference numeral 1 in FIG. 1 denotes a pipe joint 1 that constitutes a fluid pipe that is used by flowing a fluid such as clean water or gas therein. This pipe joint 1 is engaged with the insertion tube 2 and the reception tube 3 that are connected to each other with the tube axes substantially the same, and by engaging the insertion tube 2 and the reception tube 3 with each other, It is mainly comprised from the cyclic | annular body 4 in this invention which is the integral cyclic | annular shape which prevents the space | interval in the pipe-axis direction from.

  An end portion of the receiving tube 3 in the tube axis direction is formed in a receiving portion 6 having a diameter larger than that of the insertion portion 5 so that the insertion portion 5 which is an end portion of the insertion tube 2 can be inserted. Yes. Therefore, as shown in FIG. 1 and FIG. 1, the distal end of the insertion tube 2 that is the distal end of the insertion portion 5 disposed in the reception portion 6 at the insertion position where the insertion portion 5 is inserted into the reception portion 6. The surface 5a and the back end surface 6b formed on the inner side of the receiving portion 6 are in contact with or close to each other.

  Furthermore, a bulging portion 6 c that bulges in the diameter-reducing direction of the receiving tube 3 is formed on the opening end side of the receiving tube 3 from the inner end surface 6 b of the inner peripheral surface 6 a of the receiving port 6. On the opening end side of the receiving tube 3 further than the bulging portion 6c on the inner peripheral surface 6a, an inner wall portion 6f protruding in the diameter reducing direction of the receiving tube 3 is formed, and this inner wall portion 6f is formed. A fitting portion 6g is formed on the inner back side.

  One end side of an annular packing 7 as a sealing member in the present invention, which is made of an elastic material such as rubber, is fitted and disposed in the fitting portion 6g. The other end of the packing 7 is formed in an inflatable portion 7a having a substantially circular side sectional view.

  The packing 7 configured as described above is configured such that the outer peripheral surface 5b of the insertion portion 5 and the insertion portion 5 of the insertion tube 2 are inserted into the receiving portion 6, so that the outer peripheral surface 5b of the insertion portion 5 and The expansion portion 7a is sandwiched between the insertion tube 2 and the reception tube 3 in the radial direction between the inner peripheral surface 6a of the reception unit 6 and seals between the insertion unit 5 and the reception unit 6. ing.

  Further, as shown in FIGS. 1 and 3, a protruding portion 6 d as an engaging portion in the present invention is formed in the diameter reducing direction of the receiving tube 3 at the opening end portion of the inner peripheral surface 6 a of the receiving port 6. A plurality of strips (six strips in this embodiment) are provided. For this reason, on the inner peripheral surface 6a of the opening end portion of the opening portion 6, a groove portion 6h having a concave shape is formed between the protruding portion 6d and the inner wall portion 6f. The end surface of the protruding portion 6d in the insertion direction of the insertion tube 2 is formed on a contact surface 6e substantially orthogonal to the tube axis. Further, a notch 6k is formed at the substantially center in the circumferential direction of the contact surface 6e. Note that a bolt hole 6m for screwing the bolt 11 toward the diameter reducing direction of the receiving portion 6 is formed between the two adjacent protruding portions 6d and between the protruding portion 6d and the inner wall portion 6f. Has been.

  On the other hand, as shown in FIGS. 2 and 3, the annular body 4 has an inner diameter through which the insertion tube 2 can be inserted, and a concave portion 4 a is formed on the inner surface of the annular body 4 in the direction of the diameter reduction of the annular body 4. Has a plurality of openings (six openings in this embodiment) along the circumferential direction. In each recess 4a, a locking piece 9 as a locking portion in the present invention for locking to the outer peripheral surface 5b of the insertion portion 5 inserted in the annular body 4 is housed and disposed. A bolt hole 4b for screwing a bolt 10 as a pressing portion in the present invention for pressing the piece 9 toward the outer peripheral surface 5b of the insertion portion 5 is formed.

  Specifically, the concave portion 4a is partitioned by a partition wall 4c provided at a predetermined interval in the circumferential direction on the inner circumferential surface of the annular body 4, so that a plurality of ports (6 ports) are formed along the circumferential direction as described above. ) Is formed. And the locking piece 9 is arrange | positioned in the state which clamped the rubber body 4d by the circumferential direction both ends and the partition wall 4c in these recessed parts 4a. In addition, the locking piece 9 is formed in a substantially bullet-like shape that is symmetrical in a side sectional view facing the diameter increasing direction of the annular body 4, and at the end of the annular body 4 on the diameter reducing direction side, Two claw portions 9a and 9a that are engaged with the outer peripheral surface 5b are formed apart from each other in the tube axis direction.

  An extending piece 4 f is extended from the end surface of the annular body 4 on the insertion direction side of the insertion tube 2 toward the insertion direction of the insertion tube 2 from the reduced diameter direction side of the annular body 4. Furthermore, the protrusion part 4g as an engaging part in this invention protrudes from the front-end | tip part outer peripheral surface of the extended piece 4f toward the diameter expansion direction of the annular body 4 (six in this example). . The side end surfaces of the protruding portions 4g facing the insertion direction of the insertion tube 2 are formed on a contact surface 4e substantially orthogonal to the tube axis. Further, a convex portion 4h is formed at the substantially center in the circumferential direction of the contact surface 4e.

  Next, the connection between the insertion portion 5 and the receiving portion 6 by the annular body 4 in the pipe joint 1 will be described. First, one end side of the packing 7 is fitted and disposed in the fitting portion 6g in the receiving portion 6 in a state where the insertion portion 5 and the receiving portion 6 shown in FIG. Next, the annular body 4 in which the rubber body 4 d and the locking piece 9 are disposed in each recess 4 a is inserted and disposed in the insertion portion 5. Then, as shown in FIGS. 1 and 4, the insertion portion 5 is inserted into the receiving portion 6 until an insertion position where the distal end surface 5 a is in contact with or close to the back end surface 6 b of the receiving portion 6.

  From the state in which the insertion portion 5 is inserted into the receiving portion 6, the circumferential position of the annular body 4 is adjusted so that the protruding portion 4g and the protruding portion 6d are located at different positions in the circumferential direction. 4 is moved toward the receiving port 6, and the protruding portion 4 g is arranged closer to the insertion direction of the insertion tube 2 than the protruding portion 6 d.

  From this state, as shown in FIGS. 5 and 6, the annular body 4 is rotated in the circumferential direction to move the projecting portion 4 g along the groove 6 h in the circumferential direction of the receiving portion 6. The part 4g is opposed to each other by the contact surfaces 4e and 6e. Furthermore, the protrusions 4g and 6d are engaged by fitting the protrusions 4h into the notches 6k, and the bolts 11 are screwed into the bolt holes 6m. As shown in FIG. 6, the bolt 11 is disposed between the adjacent protruding portions 4 g in the receiving portion 6, so that when the annular body 4 rotates in the circumferential direction, the protruding portion 4 g is at the tip of the bolt 11. Further rotation of the annular body 4 is prevented at the abutting position, and the abutting surfaces 4e and 6e of the protrusions 4g and 6d are maintained at this position. Can be prevented from leaving.

  Then, the bolts 10 of the annular body 4 are screwed in the direction of the diameter reduction of the annular body 4 so that the claw portion 9a of the locking piece 9 is locked to the outer peripheral surface 5b of the insertion portion 5, and the annular body 4 The connection between the insertion portion 5 and the receiving portion 6 is completed.

  When the fluid flows in the pipe joint 1, the fluid presses the insertion tube 2 in the direction away from the receiving tube 3 of the insertion tube 2 from between the front end surface 5 a and the back end surface 6 b. By the pressing of the fluid, the protrusion 4h is more strongly inserted into the notch 6k. That is, the annular body 4 is prevented from being detached from the receiving portion 6 by both the fitting of the convex portion 4h into the cutout portion 6k and the screwing of the bolt hole 4m of the bolt 1.

  As described above, in the movement preventing means in the present invention, the annular body 4 and the receiving portion 6 are provided with a pair of engaging portions that are prevented from separating in the tube axis direction by being engaged with each other. The engaging portion of the receiving portion 6 is provided at a predetermined location excluding the inner back side in the tube axis direction of the inner wall portion 6f, and the pair of engaging portions are respectively provided in the annular body 4 and the receiving portion 6 in the radial direction. A pair of projecting portions 4g and 6d projecting, and the pair of projecting portions 4g and 6d are inserted into the annular body 4 and the receiving portion 6 in the tube axis direction at positions different from each other in the circumferential direction. By relatively rotating the mouth portion 6 in the circumferential direction, the pair of protruding portions 4g and 6d can be engaged with each other in the tube axis direction. By doing in this way, a pair of engaging part 4g, 6d provided in the annular body 4 and the receiving part 6 is the pipe-axis direction of the inner wall part 6f of the receiving part 6 in which the sealing member 7 is arrange | positioned. Since it will be engaged with each other at a predetermined location excluding the inner side of the inner side, there is no risk of affecting the sealing member 7 that seals between the peripheral surfaces 5b, 6a of the insertion portion 5 and the receiving portion 6. Not only can the insertion part 5 and the receiving part 6 be prevented from separating in the tube axis direction, but the integral annular member 4 is engaged with the receiving part 6 by a pair of engaging parts, and the pressing part. By individually engaging with the insertion portion 5 by the engaging portion 9 pressed by 10, it is possible to work easily. Moreover, a pair of engaging part can be easily comprised by the pair of protrusion parts 4g and 6d which each protruded to the annular body 4 and the receiving port part 6 in the radial direction, and the annular body 4 and the receiving port part 6 are made into a pipe axis. The pair of protrusions 4g and 6d can be easily engaged with each other in the tube axis direction simply by inserting each other in the direction and relatively rotating in the circumferential direction.

  Further, the protruding portion 6d of the receiving portion 6 is provided closer to the receiving tube 3 end side than the inner wall portion 6f of the inner peripheral surface 6a of the receiving portion 6, and the protruding portion 4g of the annular body 4 is formed on the inner wall portion. Since it is movable in the circumferential direction along the groove 6h formed between 6f and the protruding portion 6d of the receiving portion 6, the inner wall portion 6f provided on the inner peripheral surface 6a of the receiving portion 6 is By utilizing and forming the groove part 6h between the protrusion part 6d of the receptacle part 6, the receptacle part 6 can be made a simple structure and the protrusion part 4g of the annular body 4 can be guided by the groove part.

  Next, the movement preventing means according to the second embodiment will be described with reference to FIGS. In addition, the same structure as the said Example and the overlapping structure are abbreviate | omitted. In the first embodiment, the contact surfaces 4e and 6e are formed so as to be substantially orthogonal to the tube axis. However, the contact surfaces 4e 'and 6e' are formed as inclined surfaces, and the protruding portions 4g 'and 6d' are detached. You may make it difficult.

  Specifically, as shown in FIGS. 7 to 9, the protrusions 4 g ′ and 6 d ′ are formed on the contact surface 4 e ′ toward the circumferential direction that rotates after the annular body 4 is inserted into the receiving port 6. , 6e ′ are formed so as not to be orthogonal to the tube axis direction in front view, that is, to be inclined toward the side opposite to the insertion direction of the insertion tube 2. Further, a restraining portion 6i is provided between the end portion on the circumferential direction side that rotates after the annular body 4 of each protruding portion 6d 'is inserted into the receiving portion 6 and the inner wall portion 6f.

  In order to engage the annular body 4 configured as described above and the receiving portion 6, first, from the state where the insertion portion 5 and the receiving portion 6 shown in FIG. 7 are not connected, the receiving portion One end side of the packing 7 is fitted and arranged in the fitting portion 6 g in the inner ring 6, and the annular body 4 in which the rubber body 4 d and the locking piece 9 are arranged in each concave portion 4 a is inserted and arranged in the insertion portion 5. Then, the insertion portion 5 is inserted into the reception portion 6 until the insertion surface is in contact with or close to the rear end surface 6 b of the reception portion 6.

  From the state in which the insertion portion 5 is inserted into the receiving portion 6, the circumferential position of the annular body 4 is adjusted so that the protruding portion 4 g ′ and the protruding portion 6 d ′ are at different positions in the circumferential direction, The annular body 4 is moved toward the receiving port 6, and the protruding portion 4 g ′ is arranged on the insertion direction side of the insertion tube 2 with respect to the protruding portion 6 d ′.

  From this state, as shown in FIG. 9, by rotating the annular body 4 in the circumferential direction, the protrusion 4g ′ is moved along the groove 6h in the circumferential direction of the receiving portion 6 until it comes into contact with the restraining portion 6i. The protrusion 6d ′ and the protrusion 4g are engaged with each other at the contact surfaces 4e ′ and 6e ′. Then, the bolts 11 are screwed into the bolt holes 6m of the receiving portion 6, and the bolts 10 of the annular body 4 are screwed toward the diameter reducing direction of the annular body 4 to thereby engage the claw portions 9a of the locking piece 9. Is engaged with the outer peripheral surface 5b of the insertion portion 5, and the connection between the insertion portion 5 and the receiving portion 6 by the annular body 4 is completed.

  By engaging the annular body 4 and the receiving portion 6 as described above, the contact surfaces 4e ′ and 6e ′ that are inclined surfaces contact each other, and therefore the annular body 4 is contacted with the contact surfaces 4e ′ and 6e ′. Even if it tries to rotate in the circumferential direction in which the engagement is released, the annular body 4 is difficult to rotate because it requires movement in the insertion direction of the insertion tube 2 along the contact surface 6e '.

  As described above, in the movement preventing means according to the present invention, the pair of protrusions 4g ′ and 6d ′ have the contact surfaces 4e ′ and 6e ′ that extend along the circumferential direction and contact each other. Since the surfaces 4e 'and 6e' are formed as inclined surfaces inclined in the tube axis direction, the contact surfaces 4e 'and 6e' of the pair of protrusions 4g 'and 6d' are directed in the tube axis direction. Therefore, the contact surfaces 4e 'and 6e' can be secured with a large area, and the tube 4 can be moved along the circumferential direction of the annular body 4 and the receiving portion 6 in the tube axis direction. Therefore, the protrusions 4e 'and 6e' engaged with each other are hardly separated.

  Further, when the projecting portions 4e ′ and 6e ′ are engaged with at least one of the annular body 4 and the receiving portion 6 in a predetermined manner, the other projecting portions 6e ′ and 4e ′ are restrained in the circumferential direction. Since the restraining part 6i is provided, the restraining part 6i provided on at least one of the annular body 4 and the receiving part 6 is only restrained in the circumferential direction on the other projecting parts 4e 'and 6e'. The protruding portions 4e ′ and 6e ′ can be in a state of being engaged with each other in a predetermined manner.

  Next, the movement preventing means according to the third embodiment will be described with reference to FIG. In addition, the same structure as the said Example and the overlapping structure are abbreviate | omitted. In the first embodiment, a plurality of protrusions 4g are protruded from the outer peripheral surface of the distal end portion of the extending piece 4f toward the diameter-enlarging direction of the annular body 4, and the protrusion 6d is a receiving portion that is the end of the receiving tube 3. 6, a plurality of protrusions are provided from the inner peripheral surface 6 a of the opening end portion 6 toward the diameter-reducing direction of the receiving pipe 3. If it is not inward from 6f, the outer peripheral surface 6j of the receiving part 6 may be sufficient.

  Specifically, the opening end of the receiving port 6 is extended from the end of the inner wall 6f toward the diameter-reducing direction toward the side opposite to the insertion direction of the insertion tube 2, and the opening of the receiving port 6 is opened. A protruding portion 6d is projected from the outer peripheral surface 6j of the end portion toward the diameter increasing direction of the receiving port portion 6.

  Furthermore, from the end surface of the annular body 4 on the insertion direction side of the insertion tube 2, an extending piece 4 f ′ extends from the substantially central portion side in the radial direction of the annular body 4 toward the insertion direction of the insertion tube 2. The protruding portion 4g protrudes from the inner peripheral surface of the distal end portion of the extending piece 4f ′ toward the reduced diameter direction of the annular body 4.

  As described above, the projecting portion 6d is directed toward the diameter-enlarging direction of the receiving tube, and the projecting portion 4g is projected toward the diameter-reducing direction of the annular body 4, whereby the annular body 4 is inserted into the receiving portion 6. Then, the projecting portion 6d and the projecting portion 4g are engaged with each other at the contact surfaces 4e and 6e.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above-described embodiment, the locking piece 9 is formed symmetrically in the side sectional view, but the annular body 4 is asymmetrical in the side sectional view and the diameter direction side end of the annular body 4 is directed toward the insertion direction of the insertion tube 2. The wedge tube formed on the inclined surface that is inclined in the diameter expansion direction, and the movement in which the insertion tube 2 and the reception tube 3 are detached from each other in the tube axis direction from the tubes 2 and 3 at the bottom of the bolt 10. The claw portions 9a and 9a may be locked by the outer peripheral surface 5b of the insertion portion 5 by pressing the inclined surface to prevent it.

  Moreover, in the said Example, although the detachment | leave from the receiving part 6 of the annular body 4 was prevented by both insertion of the convex part 4h to the notch part 6k and screwing of the bolt hole 4m of the volt | bolt 1, the annular body 4 was prevented. The detachment from the receiving portion 6 may be prevented by only one of the fitting of the convex portion 4h into the notch 6k and the screwing of the bolt hole 4m of the bolt 1.

  In the third embodiment, the protruding portion 6d protrudes from the outer peripheral surface 6j of the opening end portion of the receiving portion 6 toward the diameter increasing direction of the receiving portion 6. However, the protruding portion 6d is the receiving portion 6. If it is the outer peripheral surface of this, the place to project is not ask | required. In this case, in order to engage the protruding portion 4g with the protruding portion 6d, the protruding piece 4f ′ extending from the annular body 4 toward the insertion direction of the insertion tube 2 is provided with the protruding portion 6d. Extend to the place.

DESCRIPTION OF SYMBOLS 1 Pipe joint 2 Insertion pipe 3 Receptacle pipe 4 Ring body 4a Recessed part 4e, 4e 'Contact surface 4f, 4f' Extension piece 4g Protrusion part (engagement part)
5 Insertion Portion 5b Outer Peripheral Surface 6 Receiving Portion 6a Inner Peripheral Surface 6c Swelling Part 6d Protruding Part (engaging part)
6e, 6e 'Contact surface 6f Inner wall 6h Groove 6i Stopping portion 7 Packing (sealing member)
9 Locking piece (locking part)
10 bolts (pressing part)

Claims (4)

A sealing member that seals between the outer peripheral surface of the insertion portion of the insertion tube and the inner peripheral surface of the reception portion of the reception tube into which the insertion portion is inserted is an inner peripheral surface of the reception portion. In the pipe joint arranged on the inner back side in the pipe axis direction of the inner wall portion provided in
At least a locking portion that locks to the outer peripheral surface of the insertion portion and a pressing portion that presses the locking portion in the inner diameter direction are provided in an annular shape that is integral with the insertion portion along the circumferential direction. A movement preventing means for preventing the two mouth portions from being separated in the tube axis direction,
The annular body and the receiving part are provided with a pair of engaging parts that engage with each other to prevent the annular body and the receiving part from separating in the tube axis direction. The engaging portion is provided at a predetermined location excluding the inner back side in the tube axis direction of the inner wall portion in the receiving portion,
The pair of engaging portions are a pair of projecting portions projecting in a radial direction from the annular body and the receiving port portion, respectively, and the pair of projecting portions are located at positions different from each other in the circumferential direction. The pair of projecting portions can be engaged with each other in the tube axis direction by inserting the mouth portion into the tube axis direction and relatively rotating the annular body and the receiving port portion in the circumferential direction. The movement preventing means characterized by the above.   The protruding portion of the receiving portion is provided closer to the receiving tube end side than the inner wall portion on the inner peripheral surface of the receiving portion, and the protruding portion of the annular body includes the inner wall portion and the receiving portion. The movement preventing means according to claim 1, wherein the movement preventing means is movable in a circumferential direction along a groove formed between the protrusion and the protrusion.   The pair of protrusions have contact surfaces that extend along the circumferential direction and contact each other, and the corresponding contact surfaces are formed as inclined surfaces that are inclined toward the tube axis direction. The movement preventing means according to claim 1 or 2.   At least one of the annular body and the receiving portion is provided with a restraining portion that restrains the other projecting portion in the circumferential direction when the projecting portions are engaged with each other in a predetermined manner. The movement preventing means according to any one of claims 1 to 3.

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