JP2010286003A - Flexible pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable the reinsertion and reuse of a flexible pipe and a joint body by preventing the deformation of a crest of the flexible pipe and damage of a seal material even when the flexible pipe is pulled after the flexible pipe is inserted to a position exerting the sealing performance of the joint body. <P>SOLUTION: The flexible pipe joint 10 includes the joint body 20, and the seal material 24. The seal material 24 is stored in the joint body 20 and elastically deformed in an expandable and contractible manner in the radial direction, forming a pipe insertion hole 63 through which the flexible pipe inserted in the joint body 20 is inserted in the middle thereof. A seal acting part 62 is provided on the inner peripheral side of the seal material 24. The seal acting part 62 is closely engaged with the trough part of the flexible pipe through the diameter reduction of the seal material 24 to move the seal material 24 in the pulling direction along the inside of the joint body 20 by pulling the flexible pipe so as to expand the diameter and release the close engagement with the trough. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a flexible pipe joint.

The joint for flexible pipes of patent document 1 is disclosed in FIG.
In this flexible pipe joint, the resin coating 314 surrounding the outer periphery on the distal end side of the flexible pipe 300 is peeled by a predetermined length to expose a plurality of crests 310 and troughs 312, and the exposed flexible pipe 300. The tip side is inserted into the joint body 250. When the flexible pipe 300 reaches the waterproof packing 256 that is fixedly arranged in the joint body 250, the flexible pipe 300 is inserted (pushed) with a stronger force. The surface was strongly brought into close contact with the flexible tube 300 and the joint body 250 to ensure the sealing property (sealing property).

JP 2003-176888 A

  However, in the joint for flexible pipes as in Patent Document 1, the flexible pipe 300 is inserted (pushed in) up to the waterproof packing 256, and the crest portion of the flexible pipe 300 and the inner peripheral surface of the waterproof packing 256 are strongly intimately bonded. When the flexible tube 300 is pulled out, the peak portion of the flexible tube 300 is deformed due to strong contact between the peak portion of the flexible tube 300 and the inner peripheral surface of the waterproof packing 256, or the inner peripheral surface of the waterproof packing 256 is damaged. Sometimes. For this reason, if the flexible tube 300 is reinserted after being in close contact with each other, there will be a problem with the sealing performance, and the flexible tube 300 and the joint body 250 cannot be reinserted and reused.

  Since this re-insertion / reuse cannot be performed, before connecting the flexible tube 300 and the joint body 250, whether or not the required length of the flexible tube 300 is appropriate is actually inserted into the joint body 250 and confirmed. The problem of being unable to re-insert / reuse the flexible pipe 300 / joint body 250 when there is some problem such as a connection error or a mistake in the peeling length on the distal end side of the flexible pipe 300 was there.

  The present invention has been made to solve such a problem, and the object of the present invention is to insert the flexible tube to the point where the sealing performance of the joint body is exerted, and then remove the flexible tube again. An object of the present invention is to provide a joint for a flexible pipe that prevents deformation of a crest of the flexible pipe and damage to the sealing material, and enables re-insertion / reuse of the flexible pipe / joint body.

  In order to achieve the above object, according to an aspect of the present invention, the flexible pipe joint 10 includes a joint body 20 and a sealing material 24. In the joint body 20, the flexible pipe 300 in which the crests 310 and the troughs 312 are alternately arranged in the pipe axis direction is inserted into the outer circumference of the joint body 20. The seal member 24 is accommodated in the joint body 20, and a tube insertion hole 63 into which the flexible tube 300 inserted into the joint body 20 is inserted is formed in the center, and is elastically deformed so as to be expandable and contractable in the radial direction. A receiving portion 61 b is provided on the back side of the sealing material 24. The receiving part 61 b is pushed by the flexible pipe 300 inserted into the pipe insertion hole 63 and moves the sealing material 24 to the back side of the joint body 20. A seal material diameter reducing guide 46 is provided on the inner peripheral surface of the joint body 20. The seal material diameter reducing guide 46 reduces the diameter of the seal material 24 moved to the back side of the joint body 20. A sealing portion 62 is provided on the inner peripheral side of the sealing material 24. The sealing action part 62 closely engages with the outer peripheral surface of the flexible tube 300 due to the reduced diameter of the sealing material 24, and moves the sealing material 24 in the extraction direction along the sealing material reduced diameter guide portion 46 when the flexible tube 300 is pulled out. And the close engagement with the outer peripheral surface is released.

  Further, it is desirable to provide a retaining portion 64 at the front end portion of the sealing material 24 described above. The retaining portion 64 moves integrally with the sealing material 24 and engages with the valley portion 312 of the flexible tube 300. In this case, a retaining portion guide surface 56 is provided on the inner peripheral surface of the joint body 20 before the seal material diameter-reducing guide portion 46. The retaining portion guide surface 56 causes the retaining portion 64 to enter and engage the valley portion 312 of the flexible tube 300 when the sealing material 24 is moved to the back side of the joint body 20, and the sealing material 24 is moved in the pulling direction. At the time of release, the retaining portion 64 is returned to be disengaged from the trough 312 and disengaged.

  If comprised in this way, even if it adds the retaining part 64 which prevents the flexible tube 300 from falling, when the flexible tube 300 is inserted, the retaining part 64 is moved to the back side of the joint body 20 together with the sealing material 24. When the flexible pipe 300 is pulled out by entering the valley portion 312 of the flexible tube 300, the retaining portion 64 is moved together with the sealing material 24 in the drawing direction, and is released from the valley portion 312 to be disengaged. Therefore, deformation of the peak portion 310 of the flexible tube 300, damage to the sealing material 24, and deterioration of the sealing performance are prevented, and the flexible tube 300 and the joint body 20 can be reinserted and reused.

  Alternatively, it is desirable that the above-described joint body 20 is provided with a push ring 22. The pusher wheel 22 is engaged with the valley portion 312 of the flexible pipe 300 and then moved to the back side of the joint body 20 to restrict the movement of the retaining portion 64 in the pulling direction.

  With this configuration, even if the pusher wheel 22 is added, the pusher wheel 22 is not added to the flexible tube 300 or the sealing material 24 unless the pusher wheel 22 enters the inner side of the joint body 20. However, the flexible pipe 300 and the joint body 20 can be reinserted and reused.

  Further, it is desirable that a seal material accommodating portion is provided on the back side of the joint material 20 from the seal material diameter reducing guide portion 46 described above. The sealing material accommodating portion 48 maintains close contact with the outer peripheral portion of the sealing material 24 and close engagement between the sealing action portion 62 of the sealing material 24 and the valley portion 312 of the flexible tube 300, so that the joint body 20 and the flexible tube 300 To ensure the sealability between.

  If constituted in this way, since the sealing material accommodating portion 48 is provided on the back side from the sealing material diameter-reducing guide portion 46 of the joint body 20, the flexible pipe 300 and the joint body 200 can be reinserted and reused. After setting (after connecting) the flexible pipe 300 to the joint body 20, stable sealing performance can be ensured over a long period of time.

  According to the present invention, even when the flexible pipe is inserted into the joint body and then pulled out again, deformation of the crest of the flexible pipe and damage to the sealing material are prevented, and the flexible pipe / joint body is reinserted.・ Reuse becomes possible.

It is sectional drawing which shows the coupling for metal flexible pipes concerning the Example of this invention. It is sectional drawing which shows the coupling main body concerning the Example of this invention. It is A arrow directional view of the joint for metal flexible pipes concerning the Example of this invention. It is an enlarged view of the metal nail | claw concerning the Example of this invention. It is a perspective view of the push ring concerning the Example of this invention. It is a figure which shows the mechanism in which the joint for metal flexible pipes concerning the Example of this invention fixes a metal flexible pipe. It is a half notched cross-sectional view of a joint for flexible pipe according to a conventional example.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  As shown in FIG. 1, the flexible pipe joint 10 according to the present embodiment includes a metal joint body 20 and a push ring 22. A malfunction prevention collar 110 is fitted between the joint body 20 and the push ring 22. Since the structure of the malfunction prevention collar 110 is well known, detailed description thereof will not be repeated here.

  The structure of the joint body 20 will be described with reference to FIG. An insertion port 30 is formed at one end of the joint body 20. A male screw is formed at the other end (not shown) of the joint body 20. The insertion port 30 is a port for receiving the tip of a metal flexible tube 300 (in this embodiment, the material of the metal flexible tube 300 is different from that of the joint body 20). The inside of the joint body 20 communicates with the outside of the joint body 20 through the insertion port 30. In the description of the present invention, “communication” means that two spaces are made continuous through a passage. The “passage” here includes not only a tubular shape but also a simple hole. The metal flexible tube 300 passes through the push ring 22 and is inserted into the joint body 20 from the insertion port 30.

  Inside the joint body 20, a first housing portion 42, a second housing portion 44, a sealing material diameter-reducing guide portion 46, and a sealing material housing portion 48 are provided. Among these, the first accommodating portion 42 is located closest to the insertion port 30. Among these, the seal material container 48 is located on the innermost side. The first accommodating portion 42 is formed at the back of the insertion port 30 and communicates with the insertion port 30. The second storage portion 44 is formed in the back of the first storage portion 42 and communicates with the first storage portion 42. The seal material diameter-reducing guide portion 46 is formed at the back of the second housing portion 44. The seal material diameter-reducing guide portion 46 is narrowed away from the second housing portion 44. The sealing material accommodating portion 48 is formed with a uniform inner diameter behind the sealing material diameter-reducing guide portion 46. The sealing material accommodating portion 48 accommodates the distal end portion of the metal flexible tube 300 and the sealing material 24 on the outer periphery of the distal end portion. The description about the sealing material 24 is mentioned later.

  The first accommodating portion 42 includes a grooved portion 54 and a retaining diameter reducing guide surface 56. The grooved portion 54 communicates with the insertion port 30. The retaining diameter reducing guide surface 56 is provided at a boundary portion with the second housing portion 44. The removal-reducing diameter guide surface 56 is narrowed away from the insertion port 30.

  The grooved portion 54 is provided with a snap ring temporary fixing groove 92 and a main body recessed portion 94. These extend in a direction perpendicular to the central axis of the joint body 20. As will be described later, a snap ring 26 is fitted into these. The main body recessed portion 94 is provided at a position farther from the insertion port 30 than the snap ring temporary fixing groove 92. A groove taper surface 92 a is formed on the inner groove wall in the snap ring temporary fixing groove 92. The groove taper surface 92 a is narrowed toward the second housing portion 44.

  A fireproof packing groove 96 is provided on the inner periphery of the second housing portion 44 so as to surround the outer periphery of the sealing material 24. A fireproof packing 104 is fitted in the fireproof packing groove 96. In this embodiment, the fireproof packing 104 is made of rubber with thermally expandable graphite.

  A stopper portion 50 is provided at the inner back end of the sealing material accommodating portion 48. The stopper portion 50 protrudes in the direction of the central axis of the joint body 20 as compared with the sealing material housing portion 48.

  With reference to FIG. 1 again, the arrangement and role of the pusher wheel 22, the sealing material 24, and the snap ring 26 will be described. The pusher wheel 22 is connected to the joint body 20 in a temporarily inserted state that leaves a pushing allowance. The sealing material 24 is accommodated in the joint body 20 through the insertion port 30 of the joint body 20. The sealing material 24 is disposed on the back side (the male screw side (not shown)) of the joint body 20 with respect to the pusher wheel 22. The snap ring 26 is accommodated in the joint body 20. The snap ring 26 is an engaging member that can expand and contract in the radial direction.

  The structure of the sealing material 24 will be described with reference to FIGS. 1 and 3. The sealing material 24 according to the present embodiment has an engaging portion 61 and a sealing action portion 62. A tube insertion hole 63 is formed in the center of the sealing material 24. A metal flexible tube 300 is inserted into the tube insertion hole 63. The engagement portion 61 is pushed by the metal flexible tube 300 inserted into the tube insertion hole 63 to move the seal material 24 to the insertion completion position of the joint body 20 (in this embodiment, the seal material accommodation portion 48). Part. The seal action part 62 projects outward from the rear end part of the engagement part 61. When the sealing action part 62 engages with the valley 312 of the metal flexible tube 300, the inner peripheral surface of the joint body 20 and the outer peripheral surface of the metal flexible tube 300 are sealed.

  The engaging part 61 has a cylindrical part 61a and a pipe end receiving part 61b. The inner diameter of the cylindrical portion 61 a is substantially the same as the outer diameter of the peak portion 310 of the metal flexible tube 300. The tube end receiving portion 61b projects inwardly from the front end portion of the tubular portion 61a. When the metal flexible pipe 300 is inserted into the joint body 20, the pipe end receiving portion 61 b hits the tip of the metal flexible pipe 300.

  A plurality of retaining portions 64 are provided on the rear side of the sealing material 24, that is, on the side closer to the insertion port 30 than the engaging portion 61. These retaining portions 64 are arranged so as to be aligned in the circumferential direction. The retaining portions 64 are separated from each other with a predetermined interval. When the sealing material 24 is accommodated in the joint body 20, the diameter of the space surrounded by the retaining portion 64 is larger than the outer diameter of the peak portion 310 of the metal flexible tube 300. The retaining portion 64 is located at a position before the sealing material 24 has not reached the insertion completion position of the joint body 20 (in this embodiment, the position shown in FIG. 1), and by the pusher wheel 22. When pushed, it stands in front of the push ring 22 and prevents the snap ring 26 from being fitted into the main body recessed portion 94.

  In the present embodiment, the engaging portion 61 and the retaining portion 64 are integrated.

  In the case of the present embodiment, the cylindrical portion 61a, the pipe end receiving portion 61b, the sealing action portion 62, and a part of the retaining portion 64 are made of rubber. Examples of elastically deformable electrical insulators used as these materials include NBR (Acrylonitrile-Butadiene Rubber), SBR (Styrene-butadiene rubber), and EPDM (ethylene propylene rubber). These are all rubber. However, the material of the cylindrical portion 61a, the tube end receiving portion 61b, the sealing action portion 62, and a part of the retaining portion 64 may be an electrically insulating material that can be elastically deformed, and is not limited to rubber.

  As shown in FIG. 1, a reinforcing cored bar 61f such as a brass washer is embedded in the pipe end receiving part 61b. At the tip of the retaining portion 64, a metal claw 70 (brass is an example of a material for the metal claw) is provided. A portion in contact with the outer peripheral surface of the metal flexible tube 300 and a portion in contact with the inner surface of the joint body 20 (more specifically, in the case of this embodiment, the metal flexible tube 300 in the outer peripheral surface of the metal claw 70 In addition, all except the side portion that does not contact the joint body 20 is covered with an electrical insulator. In the case of this embodiment, this electrical insulator is a rubber integrated with the engaging portion 61.

  A portion of the metal claw 70 that contacts the outer peripheral surface of the metal flexible tube 300 and a portion that contacts the inner surface of the joint body 20 (more specifically, in the case of this embodiment, out of the outer peripheral surface of the metal claw 70 All except for the side portion that does not contact the metal flexible tube 300 or the joint body 20 is covered with an electrical insulator.

  The metal claw 70 stands in front of the pusher wheel 22 when pushed by the pusher wheel 22. Further, the metal claw 70 engages with the valley 312 of the metal flexible tube 300.

  A specific structure near the metal claw 70 will be described with reference to FIG. The metal claw 70 includes a restraining portion 70a, a retaining portion 70b, and an inner peripheral surface facing portion 70c. The restraining portion 70a is pressed against the retaining portion guide surface 56 by a distal end portion 82a, which will be described later, of the push ring 22 (for this reason, the retaining portion guide surface 56 receives the metal claw 70). The retaining portion 70 b moves from the first housing portion 42 into the second housing portion 44 as the engaging portion 61 is pushed into the back of the sealing material housing portion 48. The retaining portion 70 b fits on the outer periphery of the metal flexible tube 300 as it moves from the first housing portion 42 into the second housing portion 44. The inner peripheral surface facing portion 70 c is a portion facing the inner peripheral surface of the joint body 20. Since the portion made of rubber in the retaining portion 64 extends to the restraining portion 70a, when the sealing material 24 is moved in the withdrawal direction by pulling out the flexible tube 300, the retaining portion 64 is connected to the flexible tube 300. The state before the insertion can be restored and separated from the valley 312 to release the engagement. Further, since the portion of the retaining portion 64 made of rubber extends to the retaining portion 70b, the elastic force for returning the retaining portion 64 to the state before insertion of the flexible tube 300 is high.

  The sealing material 24 is arranged as shown in FIG. 1 before the metal flexible tube 300 is inserted (initial state). Thereby, in the initial state, the tube end receiving portion 61b and the tubular portion 61a are located in the sealing material accommodating portion 48, the sealing action portion 62 is located in the second accommodating portion 44, and the tip of the retaining portion 64 is located. The sealing material 24 is arranged so that the portion is located at the obstructing position in the first accommodating portion 42.

  The structure of the push wheel 22 will be described with reference to FIGS. 1 and 5. The pusher wheel 22 is inserted into the joint body 20. In the insertion port 30, the push wheel 22 is movable in the axial direction. A metal flexible tube 300 can be inserted through the push ring 22.

  A tip portion 82 a is provided at a portion of the presser wheel 22 that faces the retaining portion 64. As will be apparent from the description below, the distal end portion 82a has a retaining portion on the inner peripheral surface of the first accommodating portion 42 when the retaining ring 22 is pushed into the joint body 20 when the retaining portion 64 is disposed at the obstructing position. 64 is pressed. More specifically, in the case of the present embodiment, it is the retaining portion guide surface 56 of the first accommodating portion 42 that receives the retaining portion 64 that has been pressed.

  The tip portion 82a has an inclined surface 106a and a tip surface 106b. The shape of the inclined surface 106a is a tapered shape. As a result, the inclined surface 106 a is narrowed as it approaches the tip of the push wheel 22. In this embodiment, the slope of the inclined surface 106 a is substantially the same as that of the retaining portion guide surface 56 provided on the joint body 20. The front end surface 106 b of this embodiment is a flat surface that is disposed at the front end of the press wheel 22. Of course, the tip surface 106b may be a curved surface or other surfaces. Incidentally, the inner diameter at the end on the center side of the push wheel 22 in the tip surface 106 b is equal to or larger than the inner diameter of the second housing portion 44.

  A reaction force portion 82 b is provided on the inner periphery of the tip portion of the pusher wheel 22 that faces the retaining portion 64. The reaction force portion 82 b has a shape that expands toward the back of the insertion port 30.

  In FIG. 5, an outer peripheral surface facing portion 82c is provided in a portion corresponding to the back of the reaction force portion 82b. The outer peripheral surface facing portion 82c is formed by the outer peripheral surface of the metal flexible tube 300 when the metal flexible tube 300 passes through the presser wheel 22 and the coating layer 314 of the metal flexible tube 300 hits the abutting part of the presser wheel 22. Of the crest portion 310 and the trough portion 312, it is a portion facing a portion exposed as a result of peeling of the coating layer 314.

  As shown in FIG. 5, a pusher wheel recess 84 is provided on the surface of the pusher wheel 22 that faces the inner periphery of the joint body 20. The pusher wheel recess 84 is formed in a direction orthogonal to the central axis of the pusher wheel 22.

  A waterproof packing groove 86 is provided in a portion of the pusher wheel 22 on the inlet side from the pusher wheel recess 84. The waterproof packing 102 is fitted in the waterproof packing groove 86.

  As shown in FIG. 1, a malfunction prevention collar 110 is fitted in the insertion planned portion 77. The part to be inserted 77 is that the outer periphery of the snap ring 26 of the presser wheel 22 is exposed from the joint main body 20 when the snap ring 26 is fitted in the snap ring temporary fixing groove 92, and the outer periphery of the snap ring 26 is formed in the main body recessed part 94. It is a portion arranged in the insertion slot 30 when fitted.

  The pushing allowance of the push ring 22 is set to be substantially equal to the distance between the snap ring temporary fixing groove 92 and the main body recessed portion 94.

  Next, the point which connects the metal flexible pipe 300 to the joint 10 for flexible pipes mentioned above is demonstrated, referring FIG.

  When connecting the metal flexible pipe 300, first, the metal flexible pipe 300 is inserted into the insertion port 30 of the joint body 20 from the inlet side of the pusher wheel 22. Note that the coating layer 314 at the distal end portion of the metal flexible tube 300 is peeled off in advance so that the eight peak portions 310 are exposed. However, how many peak portions 310 are exposed is determined according to the size of the joint body 20 and the like. How many peak portions 310 are exposed is not limited to that of the present embodiment.

  The metal flexible tube 300 inserted into the insertion port 30 passes through the sealing material 24 in the order of the retaining portion 64, the sealing action portion 62, and the cylindrical portion 61a. Thereafter, as shown in FIG. 6A, the distal end portion of the metal flexible tube 300 abuts against the tube end receiving portion 61 b of the sealing material 24. At that time, since the sealing action part 62 of the sealing material 24 is formed so as to project outward, the sealing action part 62 does not become an obstacle when the metal flexible pipe 300 is inserted. The tip of the metal flexible tube 300 can be smoothly inserted into the sealing material 24.

  When the metal flexible tube 300 is inserted until it hits the tube end receiving portion 61 b of the sealing material 24, the cylindrical portion 61 a of the sealing material 24 is pushed into the depth of the sealing material accommodation portion 48. Along with this pushing, the sealing action part 62 of the sealing material 24 moves to the narrow side of the sealing material diameter-reducing guide part 46. The sealing action part 62 is pressed by the sealing material diameter reducing guide part 46 and is reduced in diameter inwardly. As soon as the sealing action part 62 passes through the sealing material diameter reducing guide part 46 and is drawn into the sealing material accommodating part 48, the sealing action part 62 engages with the valley 312 of the metal flexible tube 300. At that time, the sealing action part 62 is in close contact with the slope of the valley 312. At the same time, the retaining portion 64 moves to the constricted side of the retaining portion guide surface 56. The retaining portion 64 is pulled into the second housing portion 44 while being pushed in the diameter reducing direction by the retaining portion guide surface 56. Thereby, as shown in FIG. 6B, the seal material 24 reliably seals the space between the outer peripheral surface of the distal end portion of the metal flexible pipe 300 and the inner peripheral surface of the seal material accommodating portion 48 of the joint body 20. Sealed. By sealing hermetically there, the fluid flowing in the metal flexible pipe 300 can be prevented from leaking from the joint body 20. Even if the metal flexible tube 300 is slightly deformed, the effect is hardly lowered. It should be noted that a sealing function can also be achieved between the tip of the metal flexible tube 300 and the tube end receiving portion 61b of the sealing material 24. FIG. 6B shows a situation in which the inner diameter portion of the tube end receiving portion 61 b of the sealing material 24 and the inner surface of the distal end portion of the metal flexible tube 300 hit the stopper portion 50 at the back of the sealing material accommodation portion 48. .

  After the insertion of the metal flexible tube 300 is completed, the malfunction prevention collar 110 is removed from the pusher wheel 22. When the malfunction prevention collar 110 is removed, the pusher wheel 22 is completely pushed. Along with this pushing, the snap ring 26 slides out of the snap ring temporary fixing groove 92 along the groove tapered surface 92a in a state where the inner peripheral portion is fitted in the pusher wheel recessed portion 84. Since it moves along the groove taper surface 92a, the snap ring 26 is elastically deformed to reduce its diameter. When the push ring 22 is completely pushed in, the outer periphery of the snap ring 26 fits into the main body recess 94. When the outer periphery of the snap ring 26 fits into the main body recess 94, the diameter of the snap ring 26 that has been reduced in diameter until then increases. Thereby, the position of the push wheel 22 can be fixed. FIG. 6C shows a state where the push wheel 22 is completely pushed. The front end portion of the push ring 22 is held at a complete pushing position located on the rear side of the retaining portion 64. At this time, as clearly shown in FIG. 6C, the sealing state by the sealing material 24 is ensured.

  Further, as the push wheel 22 is completely pushed, the reaction force portion 82b at the tip end of the push wheel 22 is close to and opposed to the retaining portion 64. Thereafter, when a pulling force is applied to the metal flexible pipe 300 in the direction of pulling out from the joint body 20, the retaining portion 64 moves slightly toward the insertion port 30 and contacts the reaction force portion 82b. When the retaining portion 64 comes into contact with the reaction force portion 82b, it receives a reaction force from the reaction force portion 82b. When the retaining portion 64 receives a reaction force from the reaction force portion 82 b, the retaining portion 70 b moves toward the bottom of the valley portion 312 of the metal flexible tube 300. The retaining portion 64 receives a reaction force from the reaction force portion 82b, and the retaining portion 70b transmits the reaction force to the metal flexible tube 300, thereby preventing the metal flexible tube 300 from coming out.

  At this time, as is clear from FIG. 6, the inner peripheral surface facing portion 70 c of the pusher wheel 22 is separated from the metal flexible tube 300, and the pusher wheel 22 holds the metal flexible tube 300 through the coating layer 314. is doing. Therefore, a portion of the metal flexible pipe 300 that is not covered with the coating layer 314 is formed in the joint body 20 by the electrical insulator sealing material 24, the electrical insulator that covers the metal claw 70, and the presser wheel 22. It is electrically insulated from the peripheral surface. For this reason, there is no exchange of electrons due to the difference in corrosion potential between the metal flexible pipe 300 and the joint body 20.

  Next, the operation of the flexible pipe joint 10 when the metal flexible pipe 300 having a short exposed portion is inserted will be described.

  When the metal flexible tube 300 is inserted into the joint body 20, the metal flexible tube 300 passes through the sealing material 24 in the order of the retaining portion 64, the sealing action portion 62, and the tubular portion 61 a. Thereafter, the distal end portion of the metal flexible tube 300 abuts against the tube end receiving portion 61 b of the sealing material 24.

  When the metal flexible tube 300 is inserted until it comes into contact with the tube end receiving portion 61 b of the sealing material 24, the tubular portion 61 a of the sealing material 24 is pushed into the depth of the sealing material accommodation portion 48. Along with this pushing, the sealing action part 62 of the sealing material 24 moves to the narrow side of the sealing material diameter-reducing guide part 46. At the same time, the retaining portion 64 moves to the constricted side of the retaining portion guide surface 56. However, since the coating layer 314 of the metal flexible tube 300 abuts against the abutting portion 88 of the push wheel 22, a part of the retaining portion 64 is not drawn into the second accommodating portion 44.

  When the coating layer 314 hits the abutting portion 88, the malfunction prevention collar 110 is removed from the push wheel 22. When the malfunction prevention collar 110 is removed, the pusher wheel 22 is pushed into the joint body 20. With this pushing, the tip end portion 82 a of the push wheel 22 advances to the back of the joint body 20. The distal end portion 82 a that has advanced to the back of the joint body 20 presses the restraining portion 70 a against the retaining portion guide surface 56. By pressing the restraining portion 70a against the retaining portion guide surface 56, the pusher wheel 22 receives a reaction force from the restraining portion 70a. Since the reaction force is received, the pusher wheel 22 cannot be advanced to the back of the joint body 20.

  In addition, when the push ring 22 is pushed in without inserting the metal flexible pipe 300 into the joint body 20, the metal claw 70 stands in front of the push ring 22. The tip end portion 82 a of the press wheel 22 hits the metal claw 70. When the tip portion 82 a hits the metal claw 70, the restraining portion 70 a of the metal claw 70 is pressed against the inner peripheral surface of the first housing portion 42. The inner peripheral surface of the first housing portion 42 receives the restraining portion 70 a of the metal claw 70. Thereby, although the metal flexible pipe 300 is not inserted in the joint main body 20, the situation where the push ring 22 is pushed into the joint main body 20 is avoided.

  As described above, the flexible pipe joint 10 according to the present embodiment allows the flexible pipe 300 and the joint body 20 to be reinserted and reused, but after setting the flexible pipe 300 to the joint body 20 (after connection). ) Can secure a stable sealing property over a long period of time. Moreover, since the flexible pipe 300 and the joint body 20 can be reinserted and reused, the required length of the exposed portion is confirmed in advance by inserting the flexible pipe 300 into the flexible pipe joint 10, and then the flexible pipe 300 is used for the flexible pipe. It can be connected to the joint 10.

  The embodiments disclosed herein are illustrative in all respects. The scope of the present invention is not limited based on the above-described embodiments, and it is needless to say that various design changes may be made without departing from the spirit of the present invention.

  For example, the present invention is not limited to a metal flexible pipe joint in which the insertion port 30 is formed at one end of the joint body 20 and a male screw is formed at the other end of the joint body 20. The present invention relates to other structures, for example, various types of metal flexible pipe joints that can be used as headers, symmetrical metal socket joints having sockets at both ends, and elbow type metals. Needless to say, the present invention can also be applied to joints for made flexible pipes.

  In the present invention, if the inner diameter of the cylindrical portion 61a is equal to or smaller than the outer diameter of the metal flexible tube 300, the tube end receiving portion 61b and the reinforcing core metal 61f are not necessarily required. This is because the sealing material 24 is engaged with the metal flexible tube 300 by the frictional force acting between the tubular portion 61 a and the metal flexible tube 300. When the sealing material 24 is engaged with the metal flexible pipe 300, the sealing material 24 is drawn into the second housing portion 44 of the joint body 20.

  Further, the sealing material 24 may have a plurality of sealing action portions 62. In this case, it is desirable that the sealing action portions 62 are arranged along the central axis of the sealing material 24. Further, it is preferable that the interval between the sealing action portions 62 is proportional to the interval between the crest portions 310 and the trough portions 312 of the metal flexible tube 300. These intervals may be smaller than the intervals between the peaks 310 and the valleys 312. This is because the gap between the sealing action portions 62 can be widened by elastic deformation when meshing with the valley 312 of the metal flexible tube 300.

  Further, the snap ring 26 may be prevented from fitting into the main body recessed portion 94 by a mechanism other than the distal end portion 82 a pressing the restraining portion 70 a against the inner periphery of the first accommodating portion 42. For example, the snap ring 26 may be prevented from fitting into the main body recessed portion 94 by applying a reaction force to the push ring 22 by pressing a part of the retaining portion 64 against the inner peripheral surface of the second housing portion 44. . When the structure of the joint body 20 is different from that described above, the joint body 20 other than the first housing part 42 and the second housing part 44 may receive the retaining part 64.

  Moreover, the joint 10 for flexible pipes concerning this embodiment can be used for an airtight test. That is, a male pipe (not shown) of the flexible pipe joint 10 is screwed into a cap (not shown), the metal flexible pipe 300 is inserted into the flexible pipe joint 10, and a gas is allowed to flow through the metal flexible pipe 300. By checking whether or not the gas leaks from the joint 10, it can be determined whether or not there is airtightness.

DESCRIPTION OF SYMBOLS 10 Flexible pipe joint 20 Joint main body 22 Push ring 24 Sealing material 26 Snap ring 30 Insertion port 42 1st accommodating part 44 2nd accommodating part 46 Sealing material diameter-reduction guide part 48 Sealing material accommodating part 50 Stopper part 54 Grooved part 56 Stopping part Guide surface 61 Engagement part 61a Tubular part 61b Pipe end receiving part 61f Reinforcing metal core 62 Sealing action part 63 Pipe insertion hole 64 Detachment part 70 Metal claw 70a Restraint part 70b Detachment part 70c Inner peripheral surface facing part 77 Expected insertion part 82a Tip portion 82b Reaction force portion 82c Outer peripheral surface facing portion 84 Push ring recess 86 Waterproof packing groove 88 Abutting portion 92 Snap ring temporary fixing groove 92a Groove taper surface 94 Main body recess 96 Fireproof packing groove 102 Waterproof packing 104 Fireproof packing 106a Inclined surface 106b Tip surface 110 Malfunction prevention collar 300 Metal flexible tube 310 Mountain 12 valleys 314 coating layer

Claims (4)

A joint body into which a flexible pipe in which crests and troughs are alternately arranged in the pipe axis direction is inserted in the circumferential direction on the outer periphery;
A sealing material that is accommodated in the joint body and has a tube insertion hole into which a flexible pipe inserted into the joint body is inserted in the center, and is elastically deformable so as to expand and contract in the radial direction;
A flexible pipe joint comprising:
On the back side of the sealing material, a receiving part is provided that is pushed by the flexible pipe inserted into the pipe insertion hole and moves the sealing material to the back side of the joint body,
On the inner peripheral surface of the joint body, there is provided a seal material diameter reducing guide portion for reducing the diameter of the seal material moved to the back side of the joint body,
On the inner peripheral side of the sealing material, the sealing material is closely engaged with the outer peripheral surface of the flexible pipe by the reduced diameter of the sealing material, and the sealing material is pulled out along the sealing material reduced diameter guide portion by pulling out the flexible pipe. The joint for flexible pipes is provided with the sealing action part by which it moves in a direction and diameter-expands and the close engagement with the said outer peripheral surface is cancelled | released. The front end portion of the sealing material is provided with a retaining portion that moves integrally with the sealing material and engages with the valley portion of the flexible pipe,
The inner peripheral surface of the joint body before the diameter-reducing guide portion of the seal material is engaged with the retaining portion entering the valley portion of the flexible pipe when the seal material is moved to the back side of the joint body. 2. The stopper part guide surface according to claim 1, wherein when the seal material is moved in the pulling direction, a stopper part guide surface is provided for returning the stopper part to release from the valley part and releasing the engagement. Fitting for flexible pipe.   The joint main body is provided with a push ring for restricting the movement of the retaining portion in the pulling direction by engaging the retaining portion with the valley portion of the flexible pipe and then entering the joint main body. The joint for flexible pipes according to claim 2 characterized by things.   Maintaining close contact with the outer peripheral portion of the seal material and close engagement between the seal action portion of the seal material and the trough portion of the flexible pipe on the back side of the seal material reduced diameter guide portion of the joint body. 4. The joint for flexible pipe according to claim 1, further comprising a sealing material housing portion that secures a sealing property between the joint body and the flexible pipe. 5.

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