JP2022033428A - Desorption prevention structure of pipe connection part and assembling method thereof - Google Patents

Abstract

To suppress a float of a pipe support part of a joint ring at one end side resulting from a fastening reaction force which makes a retention claw bite into an external peripheral face of an insertion port, and to stabilize a desorption prohibition function of the retention claw.SOLUTION: A first desorption prohibition part disposed at a region in which a joint ring 3 and a receptacle are opposite to each other is disposed for, when the receptacle and a spigot are relatively desorbed and moved by a set desorption distance, prohibiting further relative desorption movement by abutment and a second desorption prohibition part 5 having a bite-in induction part for inducing the retention claw to a bite-in side accompanied by the relative desorption movement of the receptacle and the spigot is disposed at a pipe support part 30D of the joint ring 3 at one end side in a pipe axial direction. The joint ring 3 comprises a plurality of divided joint ring bodies 30, and a fastener 31 for fastening both flange parts 30F of the divided joint ring bodies 30 opposite to each other in a pipe peripheral direction to a sealed state. In each of divided faces 30G of both the flange parts 30F, a metal touch face 36 is constituted at one end side at which at least the second desorption prohibition part 5 is present.SELECTED DRAWING: Figure 2

Description

In the present invention, a metal joint ring having a split structure that surrounds the fitting connection portion between the insertion port of one pipe portion and the receiving port of the other pipe portion in a sealed state is exteriorized over both pipe portions. When the receiving port and the insertion port move relative to each other by the set detachment distance at the portion where the joint ring and the other receiving port side of the pipe portion face each other in the pipe axis direction, the pipe axis direction A first detachment blocking portion is provided to prevent further relative detachment movement by contacting from the pipe, and on the pipe support portion side on one end side in the pipe axis direction of the joint ring, the outer peripheral surface of the insertion port is provided. A second detachment preventing portion is provided, which includes a retaining claw that can be bitten into the mouth and a biting guiding portion that guides the retaining claw to the biting side as the relative detachment movement between the receiving port and the insertion port is performed. Regarding the detachment prevention structure of the pipe connection part and the method of assembling it.

In the above-mentioned disconnection prevention structure of the pipe connection portion, the insertion port and the receptacle are provided by the first disconnection prevention portion provided at the portions facing each other in the pipe axis direction between the joint ring and the socket side of the other pipe portion. When a detachment force due to an earthquake or uneven subsidence acts on the mating connection portion, the relative detachment movement between the receiving port and the insertion port is allowed by the set detaching distance. As a result, it is possible to absorb a large detaching force acting on the fitting connection portion between the insertion port and the receiving port. Nevertheless, since it is possible to reliably prevent contact with relative detachment movements beyond the set detachment distance between the receptacle and the joint ring, the receptacle must come out of the pipe support portion on the other end side of the joint ring. There is no.

Further, the bite-in guiding portion of the second detachment preventing portion provided on the pipe support portion side on one end side in the pipe axis direction of the joint ring bites the retaining claw as the relative detachment movement between the receiving port and the insertion port occurs. As a whole, the insertion port of one pipe portion and the pipe support portion on one end side of the joint ring are integrally and firmly firmly fixedly connected via the second detachment prevention portion. As a result, it is possible to firmly prevent the receiving port from moving out of the pipe support portion on the other end side of the joint ring and the insertion port from moving out of the pipe support portion on one end side of the joint ring.

As disclosed in Patent Document 1, for example, the joint ring used for the conventional pipe connection portion disconnection prevention structure is a split joint having a two-split structure that can be externally attached to the insertion port and the receiving port via packing. It is provided with a ring body and bolts and nuts for fastening both flange portions of the two split joint ring bodies facing each other in the circumferential direction of the pipe. A gap is formed between the split surfaces of the flanges of the two split joint rings that face each other in the pipe circumferential direction, and the packing is compressed into a watertight state by tightening the bolts and nuts, and the retaining claw is inserted. It is configured to bite into the outer peripheral surface.

Japanese Patent No. 4382226

In the conventional joint ring, when the retaining claw is bitten into the outer peripheral surface of the insertion slot by tightening the bolt and nut, the pipe support part on one end side of the joint ring is inserted by the tightening reaction force of the retaining claw. The phenomenon of floating from the outer peripheral surface occurs. As a result, there is an inconvenience that the detachment prevention function of the retaining claw housed in the pipe support portion on one end side of the joint ring becomes unstable. In particular, in the disconnection prevention structure of the pipe connection portion in which the second detachment preventing portion is provided with a push bolt that presses the retaining claw to the biting side against the outer peripheral surface of the insertion slot, the tightening reaction force of the push bolt is used. The phenomenon that the pipe support portion on one end side of the joint ring rises from the outer peripheral surface of the insertion port tends to occur.

In view of this situation, the main problem of the present invention is one end side of the joint ring due to the tightening reaction force for causing the retaining claw to bite into the outer peripheral surface of the insertion slot by rational modification of the double split joint ring body. It is an object of the present invention to provide a detachment prevention structure of a pipe connection portion capable of suppressing the lifting of the pipe support portion and stabilizing the detachment prevention function of the retaining claw, and a useful assembling method thereof.

In the first characteristic configuration of the present invention, a metal joint ring having a split structure that surrounds the fitting connection portion between the insertion port of one pipe portion and the receiving port of the other pipe portion in a sealed state is provided on both pipe portions. When the receiving port and the insertion port move relative to each other by a set detachment distance to a portion that is exteriorized over and faces each other in the pipe axis direction between the joint ring and the receiving end side of the other pipe portion. A first detachment preventing portion is provided which abuts from the pipe axis direction to prevent further relative detachment movement, and the pipe support portion on one end side of the joint ring in the pipe axis direction is provided with the insertion port. A second detachment preventing portion provided with a retaining claw that can bite into the outer peripheral surface of the above, and a biting guiding portion that guides the retaining claw to the biting side with the relative detachment movement between the receiving port and the insertion port. It is a disconnection prevention structure of the pipe connection part provided with
The joint ring has a plurality of split joint rings that can be externally attached to the insertion port and the receiving port via packing, and both flange portions of the split joint ring bodies that face each other in the pipe circumferential direction in a sealed state. Fasteners to be fastened are provided, and the fasteners are fastened at least on one end side where the second detachment preventing portion is present on the split surface of the flange portion of the two split joint rings facing each other in the pipe circumferential direction. The point is that a metal touch surface that makes surface contact by operation is configured.

According to the above configuration, when the flange portions of the two split joint rings facing each other in the circumferential direction are fastened with fasteners, at least the second detachment prevention portion of the split surfaces of the flange portions of the double split joint rings is fastened. The metal touch surface on one end side where is present comes into surface contact. Therefore, even if a tightening reaction force for biting the retaining claw into the outer peripheral surface of the insertion port acts on the pipe support portion on one end side of the joint ring where the second detachment prevention portion is present, the pipe support on one end side is supported. It is possible to strongly prevent the portion from rising from the outer peripheral surface of the insertion port on the metal touch surface on one end side of the split surface in the flange portion of the split joint ring body.
Therefore, with a rational modification that only forms a metal touch surface on at least one end side of the split surface in the flange portion of the split joint ring body, the tightening reaction force for biting the retaining claw into the outer peripheral surface of the insertion port can be obtained. It is possible to suppress the floating of the pipe support portion on one end side of the joint ring due to this, and to stabilize the function of preventing the retaining claw from coming off.

The second characteristic configuration of the present invention is that the metal touch surface is formed at a portion of the divided surfaces of the two flange portions of the divided joint ring body, which is separated from the mounting region of the packing to one end side. be.

According to the above configuration, there is no metal touch surface in the portion corresponding to the packing mounting area in the divided surface in the flange portion of the divided joint ring body. Therefore, when fastening the flanges of both split joints with fasteners, it is possible to set the packing to a state where high sealing performance is exhibited by torque management of the fastening force at the part corresponding to the packing mounting area. can.

The third characteristic configuration of the present invention is that the metal touch surface is a first metal touch surface of a portion of the divided surfaces of both flange portions of the divided joint ring body, which is separated from the mounting area of the packing to one end side. It has a second metal touch surface at a portion displaced from the mounting area of the packing to the other end side, and the area of the first metal touch surface is configured to be larger than the area of the second metal touch surface. There is a point.

According to the above configuration, when the flange portions of the two split joint rings facing each other in the circumferential direction are fastened with fasteners, the large area on one end side of the split surface of the flange portions of the double split joint rings is the first. Each of the 1 metal touch surface and the second metal touch surface having a small area on the other end side are in surface contact with each other. Therefore, by the cooperation of the first metal touch surface and the second metal touch surface, the retaining claw is made to bite into the outer peripheral surface of the insertion port in the pipe support portion on one end side of the joint ring where the second detachment prevention portion is present. Even if the tightening reaction force for the purpose is applied, it is possible to more strongly prevent the pipe support portion on one end side from rising from the outer peripheral surface of the insertion port.

In the fourth characteristic configuration of the present invention, the pipe support portion on one end side of the joint ring is provided with a claw storage portion for storing a plurality of the retaining claws along the half-circumferential direction, and the claw storage portion is provided with the claw storage portion. , A push bolt that presses each of the retaining claws toward the outer peripheral surface side of the insertion port is screwed, and is located at one end of both flange portions of the split joint ring body among the fastening bolts of the fastener. The fastening bolt is located at the outermost portion in the radial direction on the metal touch surface outside the operating space of the push bolt located at the end in the circumferential direction of the pipe.

According to the above configuration, after the flanges of the two split joint rings facing each other in the circumferential direction are fastened with the fastening bolts of the fasteners, the push bolts are screwed to attach the retaining claws to the outer peripheral surface of the insertion port. Let it bite. At this time, since the fastening bolts located at one ends of both flanges are arranged on the outermost part in the radial direction on the metal touch surface outside the operation space of the push bolts located at the ends in the pipe circumferential direction. , The screwing operation of the push bolt located at the end in the circumferential direction of the pipe can be easily performed without being disturbed by the fastening bolt.

The fifth characteristic configuration of the present invention is that the split joint ring body is continuous with a first packing groove in the pipe axis direction formed on the split surfaces of both flange portions and one end of both first packing grooves. Formed on the inner surface of the pipe support portion on the other end side in a state of being continuous with the second packing groove in the pipe circumferential direction formed on the inner surface of the pipe support portion on one end side in the state and the other ends of both first packing grooves. A third packing groove in the circumferential direction of the pipe is provided, and the second packing groove is the outer surface side of the side wall portion on one end side where the second detachment preventing portion is present in the split joint ring body. It is in that it is overlapped with the side wall main body excluding the reinforcing ribs formed in the pipe axis in the direction of the tube axis.

According to the above configuration, when a tightening reaction force for biting the retaining claw into the outer peripheral surface of the insertion port acts on the pipe support portion on the one end side of the joint ring where the second detachment prevention portion is present, the one end side. The pipe support portion of the pipe is to be deformed to the side that rises from the outer peripheral surface of the insertion port, but the amount of deformation is small in the portion where the side wall portion on one end side of the split joint ring body is present. Therefore, the second packing groove is formed so as to be overlapped with the side wall main body portion of the side wall portion on one end side of the split joint ring body excluding the reinforcing rib formed on the outer surface side thereof in the pipe axis direction. It is possible to suppress fluctuations in the surface pressure of the packing portion in the circumferential direction of the packing mounted in the packing groove.

The sixth characteristic configuration of the present invention is that the third packing groove is formed in a two-row state with an interval in the pipe axis direction.

According to the above configuration, the first detachment preventing portion provided at the portion facing the joint ring and the receiving side of the other pipe portion in the direction of the pipe axis makes the fitting connection portion between the insertion port and the receiving port. When a detachment force due to an earthquake or uneven subsidence acts, the relative detachment movement between the socket and the insertion port is allowed for the set detachment distance. Along with this, the circumferential packing portion of the packing mounted in the third packing groove of the pipe support portion on the other end side slides along the outer peripheral surface of the other pipe portion. Since the third packing groove is formed in two rows at intervals in the direction of the tube axis, the packing portion in the circumferential direction of the packing mounted on one of the third packing grooves is worn and the surface pressure is increased. Even if it is locally lowered, the desired sealing performance can be maintained at the packing portion in the circumferential direction of the packing mounted on the other third packing groove.

The seventh feature configuration of the present invention is the method for assembling the disconnection prevention structure of the pipe connection portion according to any one of the first to sixth feature configurations.
The retaining claw is stored in the claw storage portion formed in the pipe support portion on one end side, and a push bolt that presses the retaining claw in the claw storage portion toward the outer peripheral surface side of the insertion port is screwed. The split joint ring body of the joint ring is sealed and surrounded by the fitting connection portion between the insertion port of one of the pipe portions and the receiving port of the other pipe portion. A joint ring exterior step for exteriorizing the joint ring, a joint ring fastening step for fastening both flange portions of the split joint ring bodies facing each other in the pipe circumferential direction with the fastener, and a joint ring fastening step in the claw storage portion using the push bolt. The point is to execute the push bolt operation step of pressing the retaining claw into the set bite state in this order.

According to the above configuration, in the joint ring fastening step after the joint ring exterior process, first, the split joint ring is exteriorized over both pipe portions in a state where the fitting connection portion between the insertion port and the receiving port is sealed and surrounded. The two flanges of the body are fastened to each other with fasteners. As a result, the packing interposed between the outer peripheral surfaces of both pipe portions and the plurality of split joint rings can be set to a state in which high sealing performance is exhibited.
Next, the push bolt operation step is executed after the joint wheel fastening step. When the retaining claw in the claw storage part is pressed with the push bolt to the set bite state, even if the tightening reaction force of the push bolt acts on the pipe support part on one end side of the joint ring where the second detachment prevention part exists. It is possible to strongly prevent the pipe support portion on one end side from rising from the outer peripheral surface of the insertion port on the metal touch surface on at least one end side of the split surface in the flange portion of the split joint ring body.
Therefore, while maintaining the high sealing performance of the packing, the lifting of the pipe support portion on one end side of the joint ring due to the tightening reaction force of the push bolt for biting the retaining claw into the outer peripheral surface of the insertion slot is suppressed. Therefore, it is possible to stabilize the function of preventing the retaining claw from coming off.

Top view of the disconnection prevention structure of the pipe connection portion showing the first embodiment. Side view of the disconnection prevention structure of the pipe connection part Cross-sectional view at the time of assembling the disconnection prevention structure of the pipe connection part Cross-sectional view at the time of disconnection of the disconnection prevention structure of the pipe connection part Front view of split joint ring body VI-VI line arrow view of FIG. VII-VII line arrow view of FIG. Enlarged sectional view of the second detachment prevention part Enlarged sectional view of the second detachment prevention portion showing the second embodiment.

An embodiment of the present invention will be described with reference to the drawings.
[First Embodiment]
1 to 4 show a disconnection prevention structure of a pipe connection portion used in a fluid piping system. In this disconnection prevention structure of the pipe connection portion, the insertion port 1A of the fluid pipe 1 which is an example of one pipe portion and the receiving port 2A of the fluid pipe 2 which is an example of the other pipe portion are connected by the fitting connection portion 20. Has been done. The joint ring 3 having a split structure that surrounds the fitting connection portion 20 in a sealed state is exteriorized over both fluid pipes 1 and 2.
As shown in FIGS. A first detachment preventing portion 4 is provided which abuts from the direction of the tube axis and prevents further relative detachment movement when the relative detachment movement is performed.
As shown in FIGS. 3, 4, and 8, the pipe support portion 30D on one end side of the joint ring 3 in the direction of the pipe axis has a retaining claw 52 that can bite into the outer peripheral surface 1a of the insertion port 1A and a receiving claw 52. A second detachment preventing portion 5 is provided with a bite-in guiding portion 50 for guiding the retaining claw 52 to the bite side as the relative detachment movement between the mouth 2A and the insertion port 1A is performed.

In the above-mentioned disconnection prevention structure of the pipe connection portion, the fluid pipes 1 and 2 are taken as an example of the pipe portion, but there are various types of pipe portions conventionally. For example, although not shown, it constitutes a branch pipe portion of a split T-shaped pipe that is externally fixed to the fluid pipe in a sealed state, a branch pipe portion that is integrally projected from the fluid pipe, and a part of fluid equipment. The tube part and the like can be mentioned.
Further, the fluid pipes 1 and 2 of the present embodiment are ductile cast iron pipes constituting a water pipe for transporting clean water, which is an example of fluid, but other cast iron pipes, steel pipes and the like can be used. .. Examples of the fluid include industrial water and gas in addition to clean water.

As shown in FIGS. 3 and 4, the fitting connection portion 20 between the insertion port 1A of one fluid pipe 1 and the receiving port 2A of the other fluid pipe 2 is composed of a K-shaped mechanical joint. In this K-shaped mechanical joint, an annular rubber ring 21 for sealing is mounted between the outer peripheral surface 1a of the insertion port 1A and the tapered inner peripheral surface 2a of the receiving port 2A. A push ring 22 provided with a pressing portion 22a capable of pressing the rubber ring 21 from the direction of the tube axis is exteriorized at the insertion port 1A. The flange portion 22b of the push ring 22 and the flange portion 2b of the receiving port 2A are fastened by the first fastener 23 from the pipe axis direction. The first fastener 23 is formed by arranging a plurality of T-head bolts 23A and nuts 23B at predetermined intervals in the pipe circumferential direction. By the fastening operation by the first fastener 23, the rubber ring 21 is compressed into a sealed state (watertight state) by the pressing portion 22a of the push ring 22 that is attracted and fixed to the flange portion 2b of the receiving port 2A, and the sealed state is maintained. Ru.

As shown in FIGS. 3 and 4, the first detachment preventing portion 4 includes a plurality of T-head bolts 23A of the first fastener 23 and a side wall on the other end side of the split joint ring body 30 constituting the joint ring 3. The portion 30C includes a detachment prevention wall portion 30e formed at a portion facing the head portion 23a of the T-head bolt 23A in the direction of the tube axis. Each of the bolt contact surface on the inner surface side of the detachment prevention wall portion 30e and the contact surface of the head 23a of each T-head bolt 23A is configured as a vertical surface orthogonal to or substantially orthogonal to the tube axis. ing.
When the joint ring 3 is to be exteriorized over both fluid pipes 1 and 2, the joint ring 3 is assembled in a state where the tip of each T-head bolt 23A is in contact with the inner surface of the side wall portion 30B on one end side of the double split joint ring body 30. The distance between the contact surface of the head 23a of the T-head bolt 23A at the time of assembly and the contact surface of the detachment prevention wall portion 30e on the side wall portion 30C on the other end side is the distance between the facing surfaces of the insertion port 1A. It is a set departure distance that allows relative departure movement with the receiving port 2A.

Then, as shown in FIGS. 3 and 4, when a detachment force due to an earthquake, uneven subsidence, or the like acts on the fitting connection portion 20 between the insertion port 1A and the receiving port 2A, the insertion port 1A and the receiving port 2A Allows relative withdrawal movement for only the set withdrawal distance. As a result, it is possible to absorb a large detaching force acting on the fitting connection portion 20 between the insertion port 1A and the receiving port 2A. Nevertheless, the head 23a of each T-head bolt 23A of the fitting connection portion 20 and the other end side of the split joint ring 30 are allowed to move relative to each other beyond the set detachment distance between the receiving port 2A and the joint ring 3. It can be reliably blocked by contact with the detachment prevention wall portion 30e at the side wall portion 30C of the above.

As shown in FIGS. 3, 4, and 8, the second detachment preventing portion 5 is formed in a state of opening inward in the radial direction to the pipe support portion 30D on one end side of both split joint rings 30. A push that presses each of the claw storage portion 51, a plurality of retaining claws 52 that are stored in the claw storage portion 51 along the circumferential direction of the pipe, and the retaining claw 52 toward the outer peripheral surface 1a side of the insertion port 1A. Bolt 53 and are provided.
At two locations on the inner peripheral surface of the retaining claw 52 in the direction of the tube axis, claw portions 52a having a triangular cross section along the tube circumferential direction are formed. The pressed surface 52b at the center of the tube circumferential direction on the outer surface of the retaining claw 52 is formed on an inclined surface having a larger diameter toward the receiving port 2A side. The ceiling wall 51a of the claw storage portion 51 is formed with a screw hole 54 in a direction orthogonal to the pressed surface 52b of the retaining claw 52. A push bolt 53 is screwed into the screw hole 54.
With the pressed surface 52b, which is the inclined surface of the retaining claw 52, and the tip of the push bolt 53 that abuts in the direction orthogonal to the pressed surface 52b, the retaining port 2A and the insertion port 1A are pulled out by a wedge effect as the relative detachment moves. A bite-in guiding portion 50 for guiding the stop claw 52 to the bite side is configured.

As shown in FIGS. 1 to 4, the joint ring 3 is made of cast iron having a bifurcated structure that can be freely exteriorized over both fluid pipes 1 and 2 while surrounding the fitting connection portion 20 of both fluid pipes 1 and 2. It is composed of both split joint ring bodies 30. Both split joint rings 30 are configured to have the same shape.
As shown in FIGS. 1 to 4, the split joint ring body 30 has a semi-cylindrical peripheral wall portion 30A having a diameter larger than that of the receiving port 2A, and the peripheral wall portion 30A on the radial inward side from both ends in the pipe axis direction. Semi-circular annular side wall portions 30B and 30C extending integrally with each other and a semi-cylinder integrally extending outward from the inner diameter side ends of the side wall portions 30B and 30C along the pipe axis direction. The shaped tube support portions 30D and 30E are provided as the main configuration. The side wall portion 30B on one end side on the insertion port 1A side is configured as a vertical side wall portion orthogonal to or substantially orthogonal to the tube axis. The side wall portion 30C on the other end side, which is on the receiving port 2A side, is configured as a tapered side wall portion having a smaller diameter toward the pipe support portion 30E side connected to the side wall portion 30C.

As shown in FIGS. 1, 2 and 1 to 4, flange portions 30F projecting outward in the horizontal direction are provided at both ends of the joint ring body 30 of the joint ring 3 in the circumferential direction. It is integrally formed. The flange portion 30F of both split joint rings 30 is fixedly connected to a sealed state (watertight state) by a fastening operation of a second fastener 31 provided with a plurality of fastening bolts 31A and nuts 31B. As shown in FIGS. 3 to 5, the split joint ring body 30 is between the inner peripheral surface 30a of the joint ring 3 and the outer peripheral surfaces 1a and 2c of both fluid pipes 1 and 2 including the fitting connection portion 20. An annular packing 33 is provided for sealing the surrounding space 32 formed in the watertightly to the outside in a watertight state.

As shown in FIGS. 3 to 5, the packing 33 is mounted in an annular packing groove 35 formed in each of the two split joint rings 30.
The packing groove 35 is formed on the inner surface of the first packing groove 35A formed along the pipe axis direction on the divided surface 30G of both flange portions 30F and the pipe support portion 30D on one end side facing the semi-peripheral surface of the insertion port 1A. A gap is provided in the pipe axis direction between the second packing groove 35B along the formed pipe circumferential direction and the inner surface of the pipe support portion 30E on the other end side facing the semi-peripheral surface of the fluid pipe 2 on the receiving port 2A side. It is provided with two third packing grooves 35C along the formed tube circumferential direction. Both ends of the second packing groove 35B in the circumferential direction are continuous with one end of both first packing grooves 35A. Both ends of the second packing groove 35C in the circumferential direction are continuous with the other ends of both first packing grooves 35A.

Since the overall view of the packing 33 is omitted, the packing groove 35 of FIG. 6 will be described by a reference numeral. The packing 33 includes a first packing portion 33A along the pipe axis direction mounted on both first packing grooves 35A, and a second packing portion 33B along the pipe circumferential direction on one end side mounted on the second packing groove 35B. It is configured by integrally molding the third packing portion 33C along the circumferential direction of the pipe on the other end side mounted on the third packing groove 35C of the second row.

The fitting connection portion 20 between the insertion port 1A and the receiving port 2A is provided by the first detachment preventing portion 4 provided at a portion facing the joint ring 3 and the receiving port 2A side of the other fluid pipe 2 in the direction of the tube axis. When a detachment force due to an earthquake or uneven subsidence acts on the opening, the relative detachment movement between the insertion port 1A and the receiving port 2A is allowed by the set separation distance. Along with this, the third packing portion 33C of the packing 33 mounted on the third packing groove 35C of the pipe support portion 30E on the other end side slides along the outer peripheral surface 2c of the other fluid pipe 2. Since the third packing groove 35C and the third packing portion 33C are formed in a two-row state with an interval in the pipe axis direction, a part of one of the third packing portions 33C is worn or deformed to be a surface. Even if the pressure is locally reduced, the desired sealing performance can be maintained at the other third packing portion 33C.

The second packing groove 35B of the packing groove 35 is a side wall main body excluding the reinforcing rib 30b formed on the outer surface side of the side wall portion 30B on the one end side where the second detachment preventing portion 5 is present in the split joint ring body 30. And are polymerized in the direction of the tube axis.

When the tightening reaction force of the push bolt 53 for biting the retaining claw 52 into the outer peripheral surface 1a of the insertion port 1A acts on the pipe support portion 30D on the one end side of the two split joint ring bodies 30, the pipe on the one end side The support portion 30D tries to deform to the side that rises from the outer peripheral surface 1a of the insertion port 1A, but the amount of deformation is small in the portion where the side wall portion 30B on one end side of the split joint ring body 30 exists. Therefore, the second packing groove 35B is overlapped with the side wall main body portion of the side wall portion 30B on one end side of the split joint ring body 30 excluding the reinforcing rib 30b formed on the outer surface side thereof in the direction of the pipe axis. Thereby, the surface pressure fluctuation of the second packing portion 33B of the packing 33 mounted on the second packing groove 35B can be suppressed.

As shown in FIGS. 2 and 6, a plurality of fasteners 31 constituting the second fastener 31 are formed on the split surface 30G of both flange portions 30F of the split joint ring body 30 at least on one end side where the second detachment preventing portion 5 is present. The metal touch surface 36 that comes into surface contact with each other by the fastening operation of the fastening bolt 31A and the nut 31B is configured. The region of the metal touch surface 36 is a portion displayed in a light ink pattern in FIG.

Then, when the flange portions 30F of the two split joint rings 30 facing each other in the pipe circumferential direction are fastened to each other by the second fastener 31, at least the second of the split surfaces 30G of the flange portions 30F of the double split joint rings 30. The metal touch surface 36 on one end side where the detachment preventing portion 5 is present comes into surface contact. Therefore, the push bolt 53 is tightened so that the retaining claw 52 bites into the outer peripheral surface 1a of the insertion port 1A in the pipe support portion 30D on one end side of the double split joint ring body 30 in which the second detachment prevention portion 5 is present. Even if a reaction force acts, the pipe support portion 30D on one end side rises from the outer peripheral surface 1a of the insertion port 1A, so that the metal touch surface on at least one end side of the split surface 30G in the flange portion 30F of both split joint rings 30 It can be strongly blocked at 36.
Therefore, the joint ring 3 caused by the tightening reaction force of the push bolt 53 has a rational modification to form a metal touch surface 36 on at least one end side of the divided surface 30G in the flange portion 30F of the split joint ring body 30. It is possible to suppress the lifting of the pipe support portion 30D on one end side, stabilize the detachment prevention function of the retaining claw 52, and maintain stable sealing performance.

In the present embodiment, as shown in FIGS. 2 and 5, the metal touch surface 36 is the mounting region of the first packing portion 33A of the packing 33 in the divided surface 30G of both flange portions 30F of the split joint ring body 30. Hereinafter referred to as a packing mounting area), the first metal touch surface 36A of the portion deviated from the packing mounting area to one end side in the tube axis direction, and the second metal of the portion deviated from the packing mounting area to the other end side in the tube axis direction. It is composed of a touch surface 36B.
Specifically, the first metal touch surface 36A is formed at a portion separated from the claw storage portion 51 formed on the pipe support portion 30D on the one end side of both split joint rings 30. The second metal touch surface 36B is formed at a portion separated from the third packing portion 33C on the other end side. The area of the first metal touch surface 36A is larger than the area of the second metal touch surface 36B on the other end side.

As shown in FIGS. 2 and 5, of the divided surfaces 30G in the flange portion 30F of both divided joint rings 30, the portions located between the first metal touch surface 36A and the second metal touch surface 36B are non-contact. It is configured on the surface 37. Therefore, in the packing mounting region, when the flange portions 30F of both split joint rings 30 are fastened to each other by the second fastener 31, the packing mounting region is between the non-contact surfaces 37 on the split surface 30G of both flange portions 30F facing each other in the pipe circumferential direction. A gap is created.

Then, when the flange portions 30F of the two split joint ring bodies 30 facing each other in the pipe circumferential direction are fastened to each other by the second fastener 31, one end side of the split surface 30G of the flange portion 30F of the double split joint ring body 30 Each of the first metal touch surface 36A having a large area and the second metal touch surface 36B having a small area on the other end side are in surface contact with each other. Therefore, due to the cooperation of the first metal touch surface 36A and the second metal touch surface 36B, the retaining claw 52 is bitten on the outer peripheral surface 1a of the insertion port 1A on the pipe support portion 30D on one end side of both split joint rings 30. Even if the tightening reaction force of the push bolt 53 for pushing is applied, it is possible to more strongly prevent the pipe support portion 30D on one end side from rising from the outer peripheral surface 1a of the insertion port 1A.

Moreover, of the divided surfaces 30G in the flange portion 30F of the two divided joint rings 30, the portion corresponding to the packing mounting region is configured as the non-contact surface 37. Therefore, when the flange portion 30F of the two split joint rings 30 is fastened with the second fastener 31, the packing 33 is properly sealed by controlling the torque of the fastening force at the portion corresponding to the packing mounting area. Can be set to a compressed state.

A plurality of bolt insertion holes 38 for the fastening bolt 31A of the second fastener 31 are formed in the flange portion 30F of the two split joint ring bodies 30. In the packing mounting region between the first metal touch surface 36A and the second metal touch surface 36B, a plurality of bolt insertion holes 38 are arranged at a predetermined pitch along the pipe axis direction. In the first metal touch surface 36A, two bolt insertion holes are formed along the pipe radial direction at a position separated from the screw hole 54 for the push bolt 53 formed in the ceiling wall 51a of the claw storage portion 51 toward one end. 38 is arranged. Among them, the bolt insertion hole 38 located on the outermost side in the pipe radial direction of the first metal touch surface 36A is located at a portion radially outwardly separated from the operation space of the push bolt 53 located at the end in the pipe circumferential direction. Have been placed.

Then, after fastening the flange portions 30F of the two split joint ring bodies 30 facing each other in the pipe circumferential direction with the fastening bolts 31A and nuts 31B of the second fastener 31, the push bolt 53 is screwed to the retaining claw 52. Is bitten into the outer peripheral surface 1a of the insertion port 1A. At this time, the fastening bolt 31A and the nut 31B located at one end of both flange portions 30F and on the outermost side in the pipe radial direction of the first metal touch surface 36A are push bolts 53 located at the end portions in the pipe circumferential direction. It is located in a part that deviates from the operation space in the radial direction. As a result, when the push bolt 53 located at the end in the circumferential direction is rotated by a rotation operating tool such as a box wrench, the fastening bolt 31A and the nut 31B located on the outermost side in the pipe radial direction of the first metal touch surface 36A. And the rotary operating tool do not interfere with each other, and the screwing operation of the push bolt 53 can be easily performed without being disturbed by the fastening bolt 31A and the nut 31B.

Next, a method of assembling the disconnection prevention structure of the connection portion will be described. In this method, the process of preparing the joint ring 3, the process of exterior of the joint wheel, the process of fastening the joint ring, and the process of operating the push bolt are executed in this order.
(1) Preparation Step of Joint Ring 3 A packing 33 is attached to the packing groove 35 of the double-split joint ring body 30 constituting the joint ring 3, and a plurality of packing 33 are mounted in the claw storage portion 51 of the pipe support portion 30D on one end side. The retaining claw 52 is stored along the circumferential direction of the pipe. A push bolt 53 is screwed into the screw hole 54 formed in the ceiling wall 51a of the claw storage portion 51.

(2) Joint ring exterior process A state in which the two-split joint ring body 30 of the joint ring 3 is hermetically surrounded by a fitting connection portion 20 between the insertion port 1A of one fluid pipe 1 and the receiving port 2A of the other fluid pipe 2. It is exteriorized over both fluid pipes 1 and 2. At this time, the tip of each T-head bolt 23A of the first fastener 23 is assembled in a state of being in contact with the inner surface of the side wall portion 30B on one end side of the double split joint ring body 30. The distance between the contact surface of the head 23a of the T-head bolt 23A at the time of assembly and the contact surface of the detachment prevention wall portion 30e on the side wall portion 30C on the other end side is the distance between the facing surfaces of the insertion port 1A. It is a set departure distance that allows relative departure movement with the receiving port 2A.

(3) Joint ring fastening step Next, the flange portions 30F of the two split joint ring bodies 30 facing each other in the pipe circumferential direction are fastened to each other with the fastening bolts 31A and nuts 31B of the second fastener 31. By this fastening operation, of the divided surfaces 30G of the flange portion 30F of the two divided joint rings 30, each of the first metal touch surface 36A having a large area on one end side and the second metal touch surface 36B having a small area on the other end side. Make surface contact. Since the first metal touch surface 36A and the second metal touch surface 36B on the divided surface 30G are formed on the non-contact surface 37, a gap is generated between the non-contact surfaces 37 corresponding to the packing mounting region. Therefore, when the flange portion 30F of the two split joint rings 30 is fastened with the second fastener 31, the packing 33 is properly sealed by controlling the torque of the fastening force at the portion corresponding to the packing mounting area. Set to a compressed state.

(4) Push bolt operation step The tip of the push bolt 53 screwed into each screw hole 54 of the ceiling wall 51a of the claw storage portion 51 is orthogonal to the pressed surface 52b which is the inclined surface of the retaining claw 52. Contact from the direction. Each push bolt 53 in the contact state is screwed to the tightening side, and the retaining claw 52 in the claw storage portion 51 is set to the set bite state.
Even if the tightening reaction force of the push bolt 53 acts, the pipe support portion 30D on one end side of both split joint rings 30 has the insertion port 1A due to the cooperation of the first metal touch surface 36A and the second metal touch surface 36B. It is possible to more strongly prevent the surface from rising from the outer peripheral surface 1a.
Therefore, while maintaining the high sealing performance of the packing 33, one end side of the double split joint ring body 30 caused by the tightening reaction force of the push bolt 53 for causing the retaining claw 52 to bite into the outer peripheral surface 1a of the insertion port 1A. It is possible to suppress the lifting of the pipe support portion 30D of the pipe support portion 30D and stabilize the detachment prevention function of the retaining claw 52.

The pipe support portion 30D on one end side of both split joint rings 30 and the end inner peripheral surface 30d located on one end side of the claw storage portion 51 are configured as a tapered surface having a larger diameter toward one end side. .. This is to correspond to the type in which the joint is bent.

[Second Embodiment]
FIG. 9 shows an improvement in the screw structure of the push bolt 53 of the second detachment preventing portion 5. In this screw structure, a stupid hole 60 without a female screw into which a push bolt 53 can be inserted is formed in the ceiling wall 51a of the claw storage portion 51 in the pipe support portion 30D on one end side of both split joint rings 30. A screw storage portion 62 for detachably and detachably storing a screw member 61 having a female screw (not shown) screwed with a push bolt 53 in a non-rotating state is communicated with a portion of the stupid hole 60 on the inner side in the pipe radial direction. Form.

In this embodiment, a JIS standard hexagon nut is used as the screw member 61. The screw accommodating portion 62 has a first passage portion 62A that opens in a direction orthogonal to the pipe axis with a passage width slightly larger than the diagonal distance of the hexagon nut, and a stupid hole 60 on the back side of the first passage portion 62A. It has a second passage portion 62B having an inclined posture orthogonal to the center line of the above. The vertical inner wall surface 62a on the side wall portion 30B side of the first passage portion 62A and the inclined inner wall surface 62b on the side wall portion 30B side of the second passage portion 62B are bent in a dogleg shape. The hexagon nut is inserted from the first passage portion 62A in a vertical posture and rotates in the second passage portion 62B in a mounting posture along the inner surface of the ceiling wall 51a. The hexagon nut in this mounting posture is locked at a bending portion between the vertical inner wall surface 62a and the inclined inner wall surface 62b or at a position in the vicinity thereof.

For example, in the case where the screw hole 54 is formed in the ceiling wall 51a of the claw storage portion 51 as in the first embodiment, the screw hole 54 is inclined with respect to the pipe axis and the pipe of the split joint ring body 30 is formed. Since a plurality of support portions 30D are formed at a predetermined pitch in the pipe circumferential direction, it is necessary to position the heavy pipe support portion 30D with a special jig with high accuracy and perform screwing. Therefore, a large number of steps are required for screwing, and the cost of the split joint ring body 30 increases. However, in the case of the second embodiment described above, the stupid hole 60 is formed in the ceiling wall 51a of the claw storage portion 51, and the screw member 61 such as a hexagon nut is stored in the screw storage portion 62 communicating with the stupid hole 60. Just do it. As a result, a special jig for screw processing is not required, and the number of steps can be reduced, so that the cost of the split joint ring body 30 can be reduced.
Since the other configurations are the same as the configurations described in the first embodiment, the same numbers as those in the first embodiment are added to the same configuration parts, and the description thereof will be omitted.

[Other embodiments]
(1) In each of the above-described embodiments, a K-shaped mechanical joint has been described as an example as a fitting connection portion 20 between the insertion port 1A of one fluid pipe 1 and the receiving port 2A of the other fluid pipe 2. However, it may be a push-on type T-shaped mechanical joint that can be joined only by mounting the rubber ring 21 on the inner surface of the receiving port 2A and inserting the tapered insertion port 1A.

(2) In each of the above-described embodiments, the metal touch surface 36 is the first metal touch surface 36A at a portion deviated from the packing mounting area to one end side in the tube axis direction, and the other than the packing mounting area in the tube axis direction. Although it is composed of the second metal touch surface 36B of the portion displaced to the end side, it may be carried out only on the first metal touch surface 36A.
Further, the entire divided surface 30G in the flange portion 30F of both divided joint rings 30 may be formed on the metal touch surface 36.

1 One pipe (fluid pipe)
1A Insertion port 1a Outer peripheral surface 2 The other pipe (fluid pipe)
2A Receptacle 3 Joint ring 4 1st detachment prevention part 5 2nd detachment prevention part 30 Split joint ring body 30D Pipe support part 30F Flange part 30G Split surface 31 Fastener (2nd fastener)
31A Fastening bolt 33 Packing 35 Packing groove 35A 1st packing groove 35B 2nd packing groove 35C 3rd packing groove 36 Metal touch surface 36A 1st metal touch surface 36B 2nd metal touch surface 50 Biting guide part 51 Claw storage part 52 Claw 53 push bolt

Claims (7)

A metal joint ring having a split structure that surrounds the fitting connection portion between the insertion port of one pipe portion and the receiving port of the other pipe portion in a sealed state is exteriorized over both pipe portions, and the joint ring and the joint ring. When the receiving port and the insertion port move relative to each other by the set detachment distance, they come into contact with the portion of the other pipe portion facing each other in the direction of the tube axis core from the tube axis direction. A first detachment blocking portion is provided to prevent further relative detachment movement, and the pipe support portion on one end side in the pipe axis direction of the joint ring is a retaining portion that can bite into the outer peripheral surface of the insertion port. A pipe connection portion provided with a second detachment blocking portion provided with a claw and a bite-in guiding portion for guiding the retaining claw to the bite side as the relative detachment movement between the receiving port and the insertion port is performed. It has a detachment prevention structure,
The joint ring has a plurality of split joint rings that can be externally attached to the insertion port and the receiving port via packing, and both flange portions of the split joint ring bodies that face each other in the pipe circumferential direction in a sealed state. Fasteners to be fastened are provided, and the fasteners are fastened at least on one end side where the second detachment preventing portion is present on the split surfaces of both flange portions of the split joint ring body facing each other in the pipe circumferential direction. A disconnection prevention structure for the pipe connection part, which has a metal touch surface that comes into surface contact by operation. The pipe connection portion according to claim 1, wherein the metal touch surface is formed on a portion of the split surface of both flange portions of the split joint ring body that is separated from the packing mounting region on one end side. Construction. The metal touch surface is a first metal touch surface of a portion of the divided surfaces of both flange portions of the divided joint ring body that is separated from the packing mounting area to one end side, and the other end side from the packing mounting area. The tube according to claim 1 or 2, which has a second metal touch surface of a portion detached from the surface, and the area of the first metal touch surface is larger than the area of the second metal touch surface. Connection part disconnection prevention structure. The pipe support portion on one end side of the joint ring is provided with a claw accommodating portion for accommodating a plurality of the retaining claws along a half-circumferential direction, and the claw accommodating portion includes each of the retaining claws. A push bolt that presses against the outer peripheral surface side of the insertion port is screwed in, and among the fastening bolts of the fastener, the fastening bolt located at one end of both flange portions of the split joint ring body is an end in the pipe circumferential direction. The detachment prevention structure for a pipe connection portion according to any one of claims 1 to 3, which is arranged at the outermost portion in the radial direction on the metal touch surface that is separated from the operation space of the push bolt located at the portion. .. The split joint ring body is a pipe support portion on one end side in a state of being continuous with a first packing groove in the pipe axis direction formed on the split surfaces of both flange portions and one end portion of both first packing grooves. The second packing groove in the circumferential direction formed on the inner surface and the third packing in the circumferential direction formed on the inner surface of the pipe support portion on the other end side in a state of being continuous with the other ends of both first packing grooves. The second packing groove is provided with a groove, and the second packing groove is a side wall portion of the side wall portion on one end side where the second detachment preventing portion exists in the split joint ring body, excluding the reinforcing rib formed on the outer surface side thereof. The disengagement prevention structure for a pipe connection portion according to any one of claims 1 to 4, which is overlapped with the main body portion in the direction of the tube axis. The detachment prevention structure for a pipe connection portion according to claim 5, wherein the third packing groove is formed in a two-row state at intervals in the direction of the pipe axis. The method for assembling a disconnection prevention structure for a pipe connection portion according to any one of claims 1 to 6.
The retaining claw is stored in the claw storage portion formed in the pipe support portion on one end side, and a push bolt for pressing the retaining claw in the claw storage portion toward the outer peripheral surface side of the insertion port is screwed. The split joint ring body of the joint ring is sealed and surrounded by the fitting connection portion between the insertion port of one pipe portion and the receiving port of the other pipe portion. A joint ring exterior step for exteriorizing the joint ring, a joint ring fastening step for fastening both flange portions of the split joint ring bodies facing each other in the pipe circumferential direction with the fastener, and a joint ring fastening step in the claw storage portion with the push bolt. A method of assembling a pipe connection portion disconnection prevention structure, in which the push bolt operation step of pressing the retaining claw into the set bite state and the push bolt operation step are executed in this order.

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