JP2011007238A - Flexible pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform connection in a sealed form by such a single operation that a flexible pipe is only inserted, to make hardly influenced with regard to deformation of the flexible pipe and bending or the like after construction only by sealing the peripheral surface of the flexible pipe by a seal member, to improve sealing performance, and to improve fire-resistance performance.SOLUTION: This flexible pipe joint 10 includes a joint body 20, the seal member 24, a slipping-out preventive member 64, a fire-resistant packing 104, and a pressing ring 22. The flexible pipe is inserted into the joint body 20 from a socket. The fire-resistant packing 104 contains synthetic resin and expanding material expanding when heated so as to reach temperature exceeding a threshold. The fire-resistant packing 104 is arranged in the position of a seal member waiting section, brought into contact with the slipping-out preventive member 64 during movement with the movement of a seal acting portion and expanded in the direction of a seal member reduced diameter guide portion when heated.

Description

  The present invention relates to a flexible pipe joint, and more particularly to a flexible pipe joint that can improve fire resistance.

  Patent document 1 discloses the seal structure of the joint for flexible pipes. This seal structure includes a flexible tube, a joint body, and a rubber seal. The flexible tube is a tube in which crests and troughs extending over the entire circumference in the circumferential direction are alternately arranged in the tube axis direction. The joint body has a receiving portion at one end. The receiving portion receives the distal end portion of the flexible tube. The rubber seal seals between the inner periphery of the receiving port and the outer periphery near the tip of the flexible tube. A tapered surface is formed on the inner periphery of the receiving portion so as to narrow toward the inner end of the receiving portion. A small-diameter hole is formed in a continuous manner at the small-diameter side end of the tapered surface. The rubber seal has a peripheral wall portion, an annular first protrusion projecting inwardly on the inner periphery of the distal end portion of the peripheral wall portion, and an annular second protrusion projecting outward on the outer periphery of the rear end portion of the peripheral wall portion. It is formed in a cylindrical shape. The rubber seal is fitted on the outer periphery in the vicinity of the distal end portion of the flexible tube inserted into the receiving port. The rubber seal is pressed into the small-diameter hole by receiving the pressing action by the tip of the flexible tube at the first protrusion. The rubber seal slidably brought into contact with the tapered surface and deformed inwardly with the pressing thereof has the second protrusion closely attached to at least the slope of the valley of the flexible tube. A large-diameter hole in which a female screw is formed on the inner periphery is formed in a continuous manner at the large-diameter side end of the tapered surface in the joint body. The tip of the press ring is screwed into this large diameter hole. An annular fireproof packing and a retaining ring are accommodated between the front end of the press ring and the rear end of the rubber seal. The fireproof packing is fitted to the outer periphery of the flexible tube. The retaining ring has an inner diameter portion that engages with a valley portion of the flexible tube. By the way, this fireproof packing is made of an elastic body formed by integrally molding, for example, expanded graphite and a rubber material such as NBR (nitrile rubber), and the volume expands when exposed to a high temperature such as a fire. It is a member that seals the inside of the joint body.

  According to this flexible pipe joint, it can be connected in a seal-like manner by simply inserting the flexible pipe, and at least the slope of the valley of the flexible pipe is sealed with a rubber seal, so that the flexible pipe can be deformed or bent after construction. The seal performance can be improved.

JP 2008-240771

  However, the joint for flexible pipe disclosed in Patent Document 1 has a problem that there is room for improvement in fire resistance. That is, in the joint for flexible pipes disclosed in Patent Document 1, the rubber seal is pressed into the small-diameter hole by receiving the pressing action by the tip part of the flexible pipe into the small-diameter hole. By sliding in contact with the taper surface of the main body and reducing the diameter inward, it is in close contact with at least the slope of the valley of the flexible tube. Since the flexible pipe is sealed by such a mechanism, in the joint for flexible pipe disclosed in Patent Document 1, there is a need for the rubber seal to move smoothly inside the joint body. For this reason, the fireproof packing is disposed between the front end portion of the press ring and the rear end portion of the rubber seal. If the fireproof packing is arranged closer to the tapered surface of the joint body than that, the rubber seal will not move smoothly due to the frictional force received from the fireproof packing. On the other hand, there are various gaps between the front end of the press ring and the rear end of the rubber seal. Since there are various gaps, it is difficult to completely close the gaps unless the fireproof packing is sufficiently expanded. This point is room for improvement in the fire resistance of the joint for flexible pipes disclosed in Patent Document 1.

  The present invention has been made in order to solve such problems, and the object of the present invention is to connect in a seal shape by a one-touch operation by simply inserting the flexible tube, and the outer periphery of the flexible tube by the sealing material. It is an object of the present invention to provide a flexible pipe joint that is less susceptible to deformation of a flexible pipe or bending after construction by sealing the surface, can improve sealing performance, and can improve fire resistance.

  The joint for flexible pipes of this invention is demonstrated with reference to drawings. Note that the use of the reference numerals in the figure in this column is intended to assist understanding of the contents of the invention, and is not intended to limit the contents to the illustrated range.

  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 having a receiving portion 30, a seal member 24, a retaining member 64, a fireproof packing 104, a push ring. 22. The flexible tube 300 is inserted into the joint body 20 from the receiving port 30. In the flexible tube 300, crest portions 310 and trough portions 312 extending along the entire circumference are arranged alternately in the tube axis direction. The sealing material 24 is accommodated in the joint body 20. The sealing material 24 can be elastically deformed. The retaining member 64 is accommodated in the joint body 20. The retaining member 64 is integrated with the sealing material 24 and engages with the valley 312 of the flexible tube 300. The fireproof packing 104 is accommodated in the joint body 20. The presser wheel 22 is inserted into the joint body 20 through the receiving portion 30. The push ring 22 stops the flexible tube 300 from coming off the joint body 20 together with the retaining member 64. The flexible tube 300 passes through the push ring 22 and is inserted into the joint body 20 from the receiving port 30. The joint body 20 includes a seal material standby portion 44, a seal material diameter reducing guide portion 46, and a seal material accommodation portion 48. In the sealing material standby unit 44, at least a part of the sealing material 24 is disposed in advance. The seal material diameter reducing guide portion 46 is disposed on the inner back side of the seal material standby portion 44. The seal material accommodating portion 48 is disposed on the inner back side with respect to the seal material reduced diameter guide portion 46. The sealing material 24 has a sealing action part 62 and an engaging part 61. The sealing action part 62 is accommodated in the sealing material accommodating part 48 and meshes with the valley 312 of the flexible pipe 300 to seal between the outer peripheral surface of the flexible pipe 300 and the inner peripheral surface of the joint body 20. The engaging part 61 is disposed on the inner side of the joint body 20 with respect to the sealing action part 62, is integrated with the sealing action part 62, and is pressed by the flexible pipe 300 inserted into the receiving part 30, thereby providing a sealing action. The part 62 is moved to the sealing material accommodating part 48. The retaining member 64 is engaged with the trough 312 of the flexible tube 300 by moving the seal action part 62 to the sealant accommodating part 48 and moving into the sealant standby part 44. The fireproof packing 104 contains an expanding material and a synthetic resin that expand when heated to a temperature exceeding the threshold. The refractory packing 104 comes into contact with the retaining member 64 that is moving in accordance with the movement of the sealing action part 62 in the sealing material standby part 44 and expands toward the sealing material diameter reducing guide part 46 when heated. It is arranged in the position to get.

  According to such a configuration, the sealing state of the sealing material 24 between the outer peripheral surface in the vicinity of the distal end portion of the flexible tube 300 and the inner peripheral surface of the sealing material accommodating portion 48 of the joint body 20 is the sealing action of the sealing material 24. Since the portion 62 is obtained by closely contacting at least the slope of the valley portion 312 of the flexible tube 300, the distal end portion inserted into the joint body 20 of the flexible tube 300 and the deformation in the vicinity thereof, the influence on bending after construction, and the like are affected. It becomes hard to receive and can improve sealing performance. In addition, the sealing member 24 is pressed into the sealing material accommodating portion 48 by receiving the pressing action by the distal end portion of the flexible tube 300 inserted into the receiving portion 30 into the engaging portion 61, and the sealing material is accompanied by the pressing. Since a sealing structure in which the sealing action portion 62 slidably in contact with the reduced diameter guide portion 46 and deformed inwardly is brought into close contact with the valley portion 312 of the flexible tube 300, a one-touch operation only by inserting the flexible tube 300 is adopted. Can be easily hermetically sealed. In addition, the fireproof packing 104 is disposed at a position in the sealing material standby section 44 that can expand in the direction of the sealing material diameter-reducing guide section 46 when heated. The fireproof packing 104 contains an expanding material that expands when heated to a temperature exceeding the threshold. As a result, when the fireproof packing 104 is heated to a temperature exceeding the threshold, the seal material standby portion 44 expands toward the seal material reduced diameter guide portion 46. A portion of the sealing material standby portion 44 in the direction of the sealing material diameter-reducing guide portion 46 is blocked by the flexible tube 300 and the sealing material 24, so that there are fewer gaps than the section from the retaining member 64 to the push ring 22. . Since there are few gaps, it can be easily closed. Since it can be easily closed, fire resistance is improved. And since the fireproof packing 104 contains a synthetic resin, the friction force exerted on the sealing material 24 and the retaining member 64 can be reduced by its lubricating action. Since the frictional force can be reduced, the sealing material 24 and the retaining member 64 can be moved smoothly. Since the sealing material 24 and the retaining member 64 can be moved smoothly, the fireproof packing 104 can be disposed at the above-described position.

  According to the present invention, it is possible to connect in a seal shape by a one-touch operation by simply inserting the flexible tube, and the outer peripheral surface of the flexible tube is sealed with a sealing material, so that it is not easily affected by deformation of the flexible tube or bending after construction. The sealing performance can be improved and the fire resistance can be improved.

It is sectional drawing which shows the coupling for 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 coupling for 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 coupling for flexible pipes concerning the Example of this invention fixes a flexible pipe.

  Hereinafter, embodiments of the present invention will be described 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. A receiving portion 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 receiving port 30 is a port that receives the tip of the flexible tube 300 (in this embodiment, the material of the 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 via the receiving portion 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 flexible tube 300 passes through the pusher wheel 22 and is inserted into the joint body 20 from the receiving port 30.

  Inside the joint body 20, there are provided a pusher wheel accommodating portion 42, a sealing material standby portion 44, a sealing material diameter reducing guide portion 46, and a sealing material accommodating portion 48. Among these, the pusher wheel receiving portion 42 is closest to the receiving port 30 side. Among these, the seal material container 48 is located on the innermost side. The push wheel housing part 42 is formed in the back of the receiving part 30 and communicates with the receiving part 30. The seal material standby part 44 is formed in the back of the pusher wheel accommodating part 42 and communicates with the pusher wheel accommodating part 42. The seal material diameter-reducing guide portion 46 is formed in the back of the seal material standby portion 44. The seal material diameter-reducing guide portion 46 is narrowed as it is separated from the seal material standby portion 44. The seal material accommodating portion 48 is formed at the back of the seal material diameter reducing guide portion 46. The sealing material accommodating portion 48 accommodates the distal end portion of the 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 presser wheel accommodating portion 42 includes a grooved portion 54 and a retaining diameter reducing guide surface 56. The grooved portion 54 communicates with the receiving portion 30. The removal-reducing diameter guide surface 56 is provided at a boundary portion with the sealing material standby portion 44. The removal-reducing diameter guide surface 56 is narrowed away from the receiving port 30.

  The grooved portion 54 is provided with a snap ring temporary retaining groove 92 and a push ring retaining groove 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 push ring retaining groove 94 is provided at a position farther from the receiving portion 30 than the snap ring temporary retaining 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 92a is narrowed toward the sealing material standby portion 44.

  A fireproof packing groove 96 is provided on the inner periphery of the sealing material standby 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. As will be described later, the position of the fireproof packing groove 96, and hence the position of the fireproof packing 104, comes into contact with the retaining member 64 that is moving in accordance with the movement of the sealing action portion 62 in the sealing material standby portion 44, and When heated, it is a position where it can expand in the direction of the sealing material reduced diameter guide 46.

  In the present embodiment, the fireproof packing 104 is preferably a synthetic resin (the better the lubricity with respect to the seal material 24, the better. However, the lubricity of the synthetic resin with respect to a material that can normally be used as the seal material 24). Is better than the conventional rubber such as fireproof packing, so the specific type is not particularly limited here) and thermal expansive graphite (instead of thermal expansive graphite, it is an expansive material that can be used for fireproof packing. If it exists, the kind is not specifically limited.

  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 opening 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. The flexible tube 300 is inserted into the tube insertion hole 63. The engaging portion 61 is a portion that moves the sealing material 24 to the insertion completion position of the joint body 20 (in this embodiment, the sealing material accommodating portion 48) by being pushed by the flexible tube 300 inserted into the tube insertion hole 63. is there. 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 flexible tube 300, the inner peripheral surface of the joint body 20 and the outer peripheral surface of the 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 flexible tube 300. The tube end receiving portion 61b projects inwardly from the front end portion of the tubular portion 61a. When the flexible pipe 300 is inserted into the joint body 20, the pipe end receiving portion 61 b hits the tip of the flexible pipe 300.

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

  In the present embodiment, the engaging portion 61 and the retaining member 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 member 64 are made of rubber. Examples of elastically deformable materials 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 part 61a, the pipe end receiving part 61b, the sealing action part 62, and a part of the retaining member 64 may be any material that can be elastically deformed, and is not limited to rubber. Furthermore, the material of these surface portions may be formed of the same material or different materials. Of course, it may be formed of the same material as the coating layer 314 of the flexible tube 300, or may be formed of a different material.

  As shown in FIG. 1, a reinforcing cored bar 61f such as a brass washer is embedded in the pipe end receiving part 61b. A metal claw 70 (brass is an example of a metal claw material) is provided at the tip of the retaining member 64. Of the metal claw 70, a portion that contacts the outer peripheral surface of the flexible tube 300, a portion that contacts the inner surface of the joint body 20, and a portion that contacts the push ring 22 (more specifically, in the case of this embodiment, the metal claw 70 All of the outer peripheral surfaces except for the side surface that does not contact the flexible tube 300 and the joint body 20 are covered with the rubber described above.

  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 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, an inner peripheral surface facing portion 70c, and a push wheel facing portion 70d. The restraining portion 70a is pressed against the retaining diameter reducing guide surface 56 by a tip portion 82a, which will be described later, of the pusher wheel 22 (for this reason, the retaining diameter reducing guiding surface 56 receives the metal claw 70). The fitting portion 70 b moves from the push wheel housing portion 42 into the sealing material standby portion 44 as the engaging portion 61 is pushed into the back of the sealing material housing portion 48. The fitting portion 70 b fits on the outer periphery of the flexible tube 300 as it moves from the pusher wheel accommodating portion 42 into the sealing material standby portion 44. The inner peripheral surface facing portion 70 c is a portion facing the inner peripheral surface of the joint body 20. The push wheel facing portion 70 d is a portion that contacts the push wheel 22 when a pulling force is applied to the flexible tube 300. In addition, since the part comprised with rubber | gum of the insertion part 64 has reached to the restraint part 70a, when the sealing material 24 is moved in the extraction direction by extraction of the flexible pipe 300, the insertion part 64 is made into a flexible pipe. The state before the insertion of 300 can be returned to be separated from the valley 312 and the engagement can be released. Furthermore, since the portion made of rubber in the fitting portion 64 extends to the fitting portion 70b, the elastic force for returning the fitting portion 64 to the state before the flexible tube 300 is inserted is increased. ing.

  The sealing material 24 is arranged as shown in FIG. 1 before the flexible tube 300 is inserted (initial state). Thereby, in the initial state, the pipe end receiving portion 61b and the cylindrical portion 61a are located in the sealing material accommodating portion 48, the sealing action portion 62 is located in the sealing material standby portion 44, and the retaining member 64 The sealing material 24 is arranged so that the tip portion is located at the obstructing position in the pusher wheel 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. The push wheel 22 is movable in the axial direction in the receiving port 30. The flexible tube 300 can be inserted through the push ring 22.

  A tip end portion 82 a is provided at a portion of the pusher wheel 22 that faces the retaining member 64. As will be apparent from the following description, the distal end portion 82a is prevented from coming off on the inner peripheral surface of the pusher wheel accommodating portion 42 when the pusher wheel 22 is pushed into the joint body 20 when the retaining member 64 is disposed at the obstructing position. The member 64 is pressed. More specifically, in the case of the present embodiment, the retaining member 64 that is pressed is received by the retaining diameter reducing guide surface 56 of the pusher wheel accommodating portion 42.

  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 diameter reducing guide surface 56 provided in 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 of the tip surface 106 b at the end on the center side of the push wheel 22 is equal to or larger than the inner diameter of the sealing material standby 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 member 64. The reaction force part 82 b has a flared shape that extends toward the back of the receiving part 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. When the flexible tube 300 passes through the pusher wheel 22 and the coating layer 314 of the flexible tube 300 hits the abutting part of the pusher wheel 22, the outer peripheral surface facing part 82 c is formed on the outer peripheral surface (the peak part 310 and the valley part). 312 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 retaining groove 84 is provided on the surface of the pusher wheel 22 that faces the inner periphery of the joint body 20. The presser wheel holding groove 84 is formed in a direction orthogonal to the central axis of the presser wheel 22.

  A waterproof packing groove 86 is provided in a portion of the pusher wheel 22 on the inlet side of the pusher wheel retaining groove 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 insertion-scheduled portion 77 is that the outer periphery of the snap ring 26 of the press ring 22 is exposed from the joint main body 20 when the snap ring 26 is inserted into the snap ring temporary fixing groove 92 and the outer periphery of the snap ring 26 is the press ring retaining groove 94. It is a part arranged in the receiving part 30 when it is fitted in.

  The pushing allowance of the push ring 22 is set to be substantially equal to the distance between the snap ring temporary retaining groove 92 and the push ring retaining groove 94.

  Next, a procedure for connecting the flexible pipe 300 to the above-described flexible pipe joint 10 will be described with reference to FIG.

  When connecting the flexible pipe 300, first, the flexible pipe 300 is inserted into the receiving portion 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 flexible tube 300 is peeled in advance so that the eight crests 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 flexible tube 300 inserted into the receiving portion 30 passes through the sealing material 24 in the order of the retaining member 64, the sealing action portion 62, and the cylindrical portion 61a. Thereafter, as shown in FIG. 6A, the distal end portion of the flexible tube 300 abuts against the tube end receiving portion 61 b of the sealing material 24. At this 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 flexible pipe 300 is inserted. The distal end portion of the flexible tube 300 can be smoothly inserted into the sealing material 24.

  When the flexible tube 300 is inserted until it hits 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. The sealing action part 62 is pressed by the sealing material diameter reducing guide part 46 and is reduced in diameter inwardly. The sealing action part 62 engages with the valley 312 of the flexible tube 300 as soon as it passes through the sealing material diameter reducing guide part 46 and is drawn into the sealing material accommodating part 48. 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 member 64 moves to the narrowing side of the retaining diameter reducing guide surface 56. The retaining member 64 is pulled into the sealing material standby portion 44 while being pushed in the diameter reducing direction by the retaining diameter reducing guide surface 56. As a result, as shown in FIG. 6B, the sealing material 24 reliably seals the gap between the outer peripheral surface of the distal end portion of the flexible tube 300 and the inner peripheral surface of the sealing material accommodating portion 48 of the joint body 20. The By sealing hermetically there, it is possible to prevent the fluid flowing in the flexible tube 300 from leaking from the joint body 20. Even if the flexible tube 300 is slightly deformed, the effect is hardly lowered. It should be noted that a sealing function can also be expected between the distal end portion of the flexible tube 300 and the tube end receiving portion 61 b of the sealing material 24. FIG. 6B shows a situation where 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 flexible tube 300 abut against the stopper portion 50 at the back of the sealing material accommodation portion 48.

  After the insertion of the 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 push ring holding groove 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 peripheral portion of the snap ring 26 is fitted into the push ring retaining groove 94. When the outer peripheral portion of the snap ring 26 is fitted in the push ring retaining groove 94, the diameter of the snap ring 26 that has been reduced in diameter is increased. 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 wheel 22 is held at a complete pushing position located on the rear side of the retaining member 64.

  At this time, as clearly shown in FIG. 6C, the sealing state by the sealing material 24 is ensured. Further, as apparent from FIG. 6C, the fireproof packing 104 comes into contact with the retaining member 64 that is moving in accordance with the movement of the sealing action part 62 in the sealing material standby part 44, and is heated. If it does, it will be arranged at a position where it can expand in the direction of the seal material diameter reducing guide 46.

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

  Next, the operation of the flexible pipe joint 10 when the flexible pipe 300 whose exposed portion is insufficient in length is inserted will be described.

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

  When the flexible tube 300 is inserted until it comes into contact with 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. At the same time, the retaining member 64 moves to the narrowing side of the retaining diameter reducing guide surface 56. However, since the coating layer 314 of the flexible tube 300 abuts against the abutting portion 88 of the push ring 22, a part of the retaining member 64 is not drawn into the sealing material standby 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 diameter reducing guide surface 56. By pressing the restricting portion 70a against the retaining diameter reducing guide surface 56, the pusher wheel 22 receives a reaction force from the restricting portion 70a. Since the reaction force is received, the pusher wheel 22 cannot be advanced to the back of the joint body 20.

  Note that when the push ring 22 is pushed in without inserting the flexible tube 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 distal end 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 pusher wheel accommodating portion 42. The inner peripheral surface of the press ring housing portion 42 receives the restraining portion 70 a of the metal claw 70. Thereby, although the 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 joint for flexible pipe 10 according to the present embodiment can suppress electrolytic corrosion of the flexible pipe 300.

  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 the flexible pipe joint in which the receiving portion 30 is formed at one end of the joint body 20 and the male screw is formed at the other end of the joint body 20. The present invention is applicable to other structures such as various types of flexible pipe joints that can be used as headers, symmetrical socket-type flexible pipe joints having receiving portions at both ends, elbow-type flexible pipe joints, and the like. Of course, it is applicable.

DESCRIPTION OF SYMBOLS 10 Flexible pipe joint 20 Joint main body 22 Push ring 24 Seal material 26 Snap ring 30 Receiving part 42 Push ring accommodating part 44 Seal material standby part 46 Seal material diameter reducing guide part 48 Seal material accommodating part 50 Stopper part 54 Grooved part 56 Diameter 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 Retaining member 70 Metal claw 70a Restraint part 70b Insertion part 70c Inner peripheral surface facing part 70d Push ring Opposing part 77 Insertion planned part 82a Tip part 82b Reaction force part 82c Outer peripheral surface facing part 84 Push ring holding groove 86 Waterproof packing groove 88 Abutting part 92 Snap ring temporary fixing groove 92a Groove taper surface 94 Push ring retaining groove 96 Fireproof packing groove 102 Waterproof packing 104 Fireproof packing 106a Inclined surface 106b Tip surface 110 Malfunction prevention collar 30 Flexible tube 310 crests 312 troughs 314 coating layer

Claims (1)

A joint body having a receiving portion;
A flexible tube is inserted into the joint body from the receiving port,
In the flexible tube, peaks and valleys extending over the entire circumference in the circumferential direction are alternately arranged in the tube axis direction,
An elastically deformable sealing material housed in the joint body;
A retaining member housed in the joint body, integrated with the sealing material, and engaged with a valley of the flexible pipe;
A fireproof packing housed in the joint body;
A push ring that is inserted into the joint body through the receiving port and stops the flexible pipe from coming off the joint body together with the retaining member;
The flexible pipe is a joint for a flexible pipe that passes through the push ring and is inserted into the joint main body from the receiving portion,
The joint body is
A sealing material standby portion in which at least a part of the sealing material is disposed in advance;
A seal material diameter-reducing guide portion disposed on the inner side of the seal material standby portion;
It has a sealing material accommodating portion disposed on the inner back side than the sealing material diameter reducing guide portion,
The sealing material is
A sealing portion that seals between the outer peripheral surface of the flexible tube and the inner peripheral surface of the joint body by being accommodated in the sealing material accommodating portion and meshing with a valley portion of the flexible tube;
It is arranged on the inner side of the joint main body with respect to the sealing action part, is integrated with the sealing action part, and is pushed by the flexible pipe inserted into the receiving part, thereby making the sealing action part the sealing material. An engaging portion that moves to the housing portion,
The retaining member engages with the trough of the flexible tube by moving the sealing action part into the sealing material receiving part and moving into the sealing material standby part,
The fireproof packing contains an expanding material and a synthetic resin that expand when heated to a temperature exceeding a threshold,
The fireproof packing comes into contact with the retaining member that is moving in accordance with the movement of the sealing action portion of the sealing material standby portion, and expands toward the sealing material diameter reducing guide portion when heated. A joint for flexible pipes, characterized in that it is arranged at a position to obtain.

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