JP5194187B2 - Fitting for flexible pipe - Google Patents

Description

  The present invention relates to a flexible pipe joint that is unlikely to cause fluid leakage and is less likely to become unusable due to unforeseen circumstances.

  Patent document 1 discloses the joint for flexible pipes as shown in FIG. This flexible pipe joint includes a joint body 200, a sleeve 202, a ring spring 204, an O-ring 206, a packing 208, and a push ring 210.

  A large diameter hole 200a, a medium diameter hole 200b, and a small diameter hole 200c are formed in the joint body 200 in order from the inlet side. The sleeve 202 is slidably mounted in the medium diameter hole 200 b of the joint main body 200 and engages with the distal end portion of the flexible tube 300. The inlet side of the sleeve 202 extends to the large diameter hole 200 a of the joint body 200. The ring spring 204 is formed in an annular shape, expands and contracts by elastic deformation, is fitted into the outer periphery of the valley portion 312 of the flexible tube 300 in a state where no load is applied, and is attached to the outer surface on the inlet side of the sleeve 202 in the expanded state. . The push ring 210 is screwed to the inlet side of the joint body 200. An O-ring 206 is fitted between the push ring 210 and the joint body 200. A packing 208 is attached to the inner peripheral surface of the pusher wheel 210. The inner diameter of the push wheel 210 near the inner back end is smaller than the outer diameter of the ring spring 204 when the ring spring 204 is fitted on the outer periphery of the valley 312.

  Patent document 2 discloses the joint for flexible pipes as shown to FIG. 9 (A) and (B). This flexible pipe joint includes a joint body 250, a retainer member 252, a push wheel 254, and a waterproof packing 256.

  The joint body 250 has a tube insertion hole 270. The flexible tube 300 is inserted into the tube insertion hole 270.

  The retainer member 252 is disposed in the tube insertion hole 270. The retainer member 252 has a rear protrusion 252a. The rear protrusion 252 a is inserted into the trough 312 on the outer surface of the flexible tube 300.

  The pusher wheel 254 fixes the rear protrusion 252a of the retainer member 252 while being inserted into the trough 312 on the outer surface of the flexible tube 300. The pusher wheel 254 slides in the axial direction within the tube insertion hole 270 of the joint body 250. Therefore, in the push wheel 254, the position where the rear protrusion 252a of the retainer member 252 does not fit into the valley 312 of the flexible tube 300, and the state where the rear protrusion 252a of the retainer member 252 fits into the valley 312 of the flexible tube 300. It is possible to displace between the positions holding the

  The waterproof packing 256 seals between the flexible tube 300 and the joint main body 250.

  Furthermore, the flexible pipe joint shown in FIGS. 9A and 9B is provided with a lock mechanism. This locking mechanism locks the push wheel 254 in the state described below. The state is a state in which the rear protrusion 252a is fitted into the valley 312. This locking mechanism is constituted by a stop ring member 258, a first groove 260, a second groove 262, and a third groove 264.

  The stop ring member 258 is a C-shaped member. The first groove 260 is formed in the joint body 250. The outer periphery of the stop ring member 258 engages with the first groove 260. The second groove 262 is also formed in the joint body 250. The outer periphery of the stop ring member 258 is also engaged with the second groove 262. The third groove 264 is formed on the outer peripheral surface of the push wheel 254. The inner periphery of the stop ring member 258 is engaged with the third groove 264. The stop ring member 258 slides from the first groove 260 to the second groove 262 according to the slide of the push wheel 254 while the inner peripheral portion is engaged with the third groove 264.

  When the outer peripheral portion of the stop ring member 258 is engaged with the first groove 260, the pusher wheel 254 is temporarily fixed to the joint body 250 in a half-inserted state. The position of the push wheel 254 at this time is a position where the rear protrusion 252a does not fit into the valley 312. When the outer peripheral portion of the stop ring member 258 engages with the second groove 262, the pusher wheel 254 is locked. At this time, the rear protrusion 252a is held in a state of being fitted into the valley 312. The pushing amount of the push wheel 254 is set to be substantially equal to the distance between the first groove 260 and the second groove 262 described above.

  According to this flexible pipe joint, when the push ring 254 is pushed in, the flexible pipe 300 can be connected while maintaining good sealing performance.

JP-A-6-185680 JP 2003-176888 A

  However, the flexible pipe joint disclosed in Patent Documents 1 and 2 has a problem that fluid leakage is likely to occur.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a joint for flexible pipes that is less likely to cause fluid leakage.

In order to achieve the above object, according to an aspect of the present invention, the flexible pipe joints 10 and 12 connect the flexible pipe 300. On the outer periphery of the flexible tube 300, peaks 310 and valleys 312 extending along the entire circumference are alternately arranged in the tube axis direction. The flexible pipe joints 10 and 12 include joint bodies 20 and 21, sealing materials 22 and 23, a push ring 24, and a snap ring 106. The joint main bodies 20 and 21 are formed with insertion ports 40 and 41 for inserting the flexible tube 300, and the inner wall surface has a stepped shape including a reduced diameter stepped portion. The sealing materials 22 and 23 are provided so as to be movable in the joint bodies 20 and 21. The pusher wheel 24 is provided on the side of the insertion ports 40 and 41 of the joint main bodies 20 and 21 and is movable in the insertion ports 40 and 41. The snap ring 106 positions and holds the pusher wheel 24 when the pusher wheel 24 is pushed into the joint bodies 20 and 21. The sealing materials 22 and 23 have a pipe end receiving portion 60b. The pipe end receiving portion 60b comes into contact with the distal end portion of the flexible pipe 300 when the flexible pipe 300 is inserted into the joint main bodies 20 and 21. The pusher wheel 24 has a pusher wheel tapered surface 82b. The presser wheel taper surface 82 b fits the retaining portion 60 e into the trough 312 of the flexible tube 300. The retaining portion 60e prevents the flexible tube 300 from coming out when a pulling force is applied to the flexible tube 300. By inserting the flexible pipe 300 into the joint main bodies 20 and 21, the sealing materials 22 and 23 are pushed into the back side of the joint main bodies 20 and 21, and the seals in contact with the outer peripheral surface of the flexible pipe 300 in the sealing materials 22 and 23 are inserted. As soon as the action portions 60c, 61c, 61g get over the reduced diameter step portion and the diameter is reduced, and the seal action portions 60c, 61c, 61g get over the reduced diameter step portion, the seal action portions 60c, 61c, 61g become the valleys of the flexible tube 300. The slope 312a of the portion 312 is in close contact with the region closer to the valley 312 than the peak 310 .

  According to the present invention, it is difficult to cause fluid leakage.

  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.

<First Embodiment>
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings. FIG. 1 is a half-broken cross-sectional view showing the flexible pipe joint 10 according to the first embodiment of the present invention in a state before the sealing material 22 is pushed. FIG. 2 is a half cutaway cross-sectional view of the flexible pipe joint 10 shown in a state where the sealing material 22 is being pushed. FIG. 3 is a half-broken cross-sectional view of the flexible pipe joint 10 shown in a state after the insertion of the flexible pipe 300 is completed. FIG. 4A is a cross-sectional view of the sealing member 22 in a half-broken state. FIG. 4B is a rear view of the sealing material 22. FIG. 4C is a side view of the sealing material 22.

  As shown in FIG. 1, the joint 10 for flexible pipes concerning a present Example is provided with the joint main body 20, the sealing material 22, and the press ring 24 grade | etc.,. A receiving portion 30 is formed at one end of the joint body 20. A connecting male screw 32 is formed on the outer periphery of the other end of the joint body 20. The receiving portion 30 is a portion that receives the distal end portion of the metal flexible tube 300. The sealing material 22 is accommodated inside the opening 30 of the joint body 20. The pusher wheel 24 is connected to the joint body 20 in a half-inserted state that leaves a pushing allowance. The push ring 24 is disposed closer to the insertion port 40 described later than the seal material 22.

  As shown in FIG. 1, the flexible tube 300 has crests 310 and troughs 312 extending in the circumferential direction on the outer peripheral portion thereof alternately in the tube axis direction, and the outer periphery thereof is made of a synthetic resin such as vinyl chloride. Covered with layer 314.

  As shown in FIG. 1, an insertion port 40, a first housing portion 42, and a second housing portion 44 are provided in the receiving portion 30 of the joint body 20. Among these, the insertion port 40 is located on the most entrance side. Among these, the innermost side is the second accommodating portion 44. The flexible tube 300 is inserted into the insertion port 40. The first accommodating portion 42 is formed at the back of the insertion port 40. The first accommodating portion 42 is communicated with the insertion port 40. 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 second accommodating portion 44 accommodates the distal end portion of the flexible tube 300 and the sealing material 22 described above. A stopper portion 46 is provided at the inner back end of the second housing portion 44. The stopper portion 46 protrudes in the direction of the central axis of the joint body 20 as compared with the second housing portion 44. Between the first housing portion 42 and the second housing portion 44, there is a sealing material diameter reducing guide portion 48. The seal material diameter-reducing guide portion 48 is provided on the opposite side of the insertion port 40 of the first housing portion 42. The sealing material diameter-reducing guide portion 48 has a shape that narrows as the distance from the first accommodating portion 42 increases. Between the first accommodating portion 42 and the insertion port 40, there is a retaining diameter reducing guide portion 50. The removal-reducing diameter guide portion 50 has a shape that narrows away from the insertion port 40.

  As shown to (a)-(c) of FIG. 4, the sealing material 22 concerning this embodiment is the trunk | drum 60a, the pipe end receiving part 60b, the single annular part 60c, the connection part 60d, and retaining. Part 60e. A tube insertion hole 60 h is formed in the center of the sealing material 22. The flexible tube 300 is inserted into the tube insertion hole 60h. The trunk portion 60a, the pipe end receiving portion 60b, the single annular portion 60c, the connecting portion 60d, and the retaining portion 60e are integrated. The trunk | drum 60a is cylindrical. The inner diameter of the trunk portion 60 a is substantially the same as the outer diameter of the peak portion 310 of the flexible tube 300. The tube end receiving portion 60b projects inwardly from the front end portion of the trunk portion 60a. When the single annular portion 60 c meshes with the valley portion 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 single annular portion 60c projects outward from the rear end portion of the trunk portion 60a. The connecting portion 60d is provided behind the single annular portion 60c, and connects the single annular portion 60c and the retaining portion 60e. The inner diameter of the connecting portion 60d is larger than the inner diameter of the trunk portion 60a. The retaining portion 60e is disposed at a position closer to the insertion port 40 than the rear end portion of the connecting portion 60d, that is, the single annular portion 60c. When the sealing material 22 is accommodated in the joint body 20, the inner diameter of the retaining portion 60 e is smaller than the inner diameter of the connecting portion 60 d and larger than the outer diameter of the peak portion 310 of the flexible pipe 300. When the sealing material 22 is accommodated in the joint body 20, the outer diameter of the retaining portion 60e is larger than the outer diameter of the connecting portion 60d.

  The trunk portion 60a, the single annular portion 60c, and the connecting portion 60d are made of rubber. Examples of rubbers used as these materials include NBR (Acrylonitrile-Butadiene Rubber), SBR (Styrene-butadiene rubber), and EPDM (ethylene propylene rubber).

  A reinforcing metal core 60f such as a brass washer is embedded in the tube end receiving portion 60b. The material of the tube end receiving portion 60b may be formed of the same material as that of the body portion 60a, the single annular portion 60c, and the connecting portion 60d, or may be formed of a different material.

  The retaining portion 60e is formed of a material harder than the body portion 60a, the single annular portion 60c, and the connecting portion 60d. Examples of such materials include metal materials such as brass and hard resins. A part of the retaining portion 60e has an arc shape. The plurality of retaining portions 60e are connected to the rear end portion of the connecting portion 60d. These retaining portions 60e are arranged in a circumferential direction. The retaining portions 60e are separated from each other by a predetermined interval. An outer peripheral tapered surface 62 is provided on the outer periphery of the rear end of the retaining portion 60e. The outer peripheral tapered surface 62 is narrowed toward the insertion port 40, that is, toward the rear end.

  This sealing material 22 is arranged as shown in FIG. 1 before the flexible tube 300 is inserted (initial state). That is, in the initial state, the tube end receiving portion 60b and the trunk portion 60a are located in the second accommodating portion 44, the single annular portion 60c is located in the first accommodating portion 42, and the retaining portion 60e is the insertion port 40. The sealing material 22 is disposed so as to be located inside.

  As shown in FIG. 1, a tip latch member 70 is disposed on the stopper portion 46 in the joint body 20. The tip latching member 70 is made of metal, hard resin, or the like. The tip latching member 70 has a C-shaped ring portion 72a that can be expanded and contracted in diameter and a plurality of check pawls 72b that are elastically deformable. The outer diameter portion of the ring portion 72 a is engaged in a circumferential groove 74 a provided on the outer diameter side of the stopper portion 46. The check pawl 72b protrudes into the second accommodating portion 44 from several locations on the inner diameter portion of the ring portion 72a.

  As shown in FIG. 1, the push wheel 24 includes a cylindrical portion 76a and a flange portion 76b. The cylindrical portion 76a and the flange portion 76b are integrated. The cylinder portion 76 a is disposed on the insertion port 40 side of the joint body 20 and is connected to the joint body 20. In the insertion port 40, the cylindrical portion 76a is movable in the axial direction. The flexible tube 300 can be inserted through the cylindrical portion 76a. The flange portion 76b is provided on the outer periphery of the rear end portion on the inlet side of the cylindrical portion 76a. The flange portion 76b faces the joint body 20 with a fitting portion 77 to be described later interposed therebetween. The outer diameter of the flange portion 76 b is larger than the hole diameter of the insertion port 40.

  The cylindrical portion 76 a has a packing groove 78. The packing groove 78 is provided on the inner periphery of the rear end on the inlet side of the cylindrical portion 76a. The packing groove 78 is formed in the circumferential direction. A waterproof packing 80 is fitted in the packing groove 78. The waterproof packing 80 is made of EPDM or the like. The cross section of the waterproof packing 80 is T-shaped. Pin-shaped selectively permeable members 100 are embedded in several places in the circumferential direction of the waterproof packing 80. The selectively permeable member 100 transmits gas but does not transmit solid or liquid. Thereby, a gas leak test | inspection is possible. The selectively permeable member 100 is, for example, a sheet material including a continuous porous membrane or a porous body having continuous pores. The former continuous porous membrane is obtained by molding tetrafluoroethylene resin powder. The latter porous body can be obtained by molding from thermoplastic resin powder such as polyethylene, polypropylene, polymethyl acrylate and the like.

  A guide taper surface 82 a is provided on the outer periphery of the end of the cylindrical portion 76 a on the side disposed in the insertion port 40. The shape of the guide taper surface 82a is tapered. The gradient of the guide taper surface 82 a is substantially the same as that of the retaining diameter reducing guide portion 50 provided in the joint body 20. A push wheel taper surface 82b is provided on the inner periphery of the end of the cylindrical portion 76a on the side disposed in the insertion port 40. The presser wheel taper surface 82b has a flared shape that extends toward the back of the insertion port 40.

  As shown in FIG. 1, a snap ring receiving and holding groove 84 is provided on the surface of the cylindrical portion 76 a that faces the inner periphery of the joint body 20. The snap ring housing and holding groove 84 is provided in the circumferential direction. On the other hand, a first snap ring engagement groove 90 and a second snap ring engagement groove 92 are provided on the inner periphery of the insertion port 40 of the joint body 20. Each of these extends in the circumferential direction. The second snap ring engagement groove 92 is provided at a position farther from the insertion port 40 than the first snap ring engagement groove 90. A groove taper surface 90 a is formed on the front groove wall in the first snap ring engagement groove 90. The groove taper surface 90 a is narrowed toward the first housing portion 42.

  A waterproof packing groove 86 is provided behind the snap ring housing and holding groove 84. The waterproof packing 102 is fitted in the waterproof packing groove 86. A fireproof packing groove 94 is provided on the inner periphery of the first housing portion 42 of the joint body 20 so as to surround the outer periphery of the sealing material 22. The fireproof packing groove 94 is fitted with a fireproof packing 104 made of rubber with thermally expandable graphite or the like.

  The flexible pipe joint 10 according to the present embodiment includes a first positioning and holding mechanism and a second positioning and holding mechanism. The first positioning and holding mechanism positions and holds the tip of the push wheel 24 at the initial position. FIG. 1 shows a state where the push wheel 24 is positioned and held at the initial position (half-inserted state). As is clear from FIG. 1, the initial position referred to here means after the retaining portion 60 e of the sealing material 22 before the flexible tube 300 is inserted. The second positioning and holding mechanism positions and holds the distal end portion of the push wheel 24 at a complete pushing position. FIG. 3 shows a state in which the tip end portion of the push wheel 24 is positioned and held at the complete pushing position. As is clear from FIG. 3, the complete pushing position referred to here is the retaining portion 60 e of the sealing material 22 after the sealing material 22 is pushed into the second housing portion 44 as the flexible pipe 300 is inserted. This means a position with a slight gap between them.

  As shown in FIG. 1, the first positioning and holding mechanism includes the snap ring housing and holding groove 84 of the push ring 24, the snap ring 106, the first snap ring engaging groove 90 of the joint body 20, and the covering resin layer 110. And is composed of. The snap ring 106 has an edge portion, and its outer shape changes due to elastic deformation. The snap ring housing and retaining groove 84 is housed by fitting the inner periphery of the snap ring 106. The outer periphery of the snap ring 106 is engaged with the first snap ring engaging groove 90. The covering resin layer 110 is covered so as to be in close contact with a part of the outer surface of the press ring 24 in the half-inserted state exposed from the joint body 20 and a part of the outer surface of the receiving part 30. The reason why they are in close contact with each other is that the covering resin layer 110 contracts by being heated after being put on the push wheel 24. Thereby, the coating resin layer 110 is in contact with the insertion-scheduled portion 77. The part to be fitted 77 is exposed from the joint body 20 when the outer periphery of the snap ring 106 is fitted in the first snap ring engaging groove 90 in the cylindrical part 76 a of the push ring 24, and When the outer periphery is fitted in the second snap ring engaging groove 92, it is a portion arranged in the insertion port 40. As a result, the flange portion 76b faces the joint body 20 with the insertion-scheduled portion 77 interposed therebetween. The covering resin layer 110 is made of a heat-shrinkable plastic film having a thickness larger than the gap between the inner peripheral surface of the insertion port 40 and the cylindrical portion 76a of the push ring 24. Instead of a heat-shrinkable plastic film, it may be made of a heat-shrinkable plastic sheet or a tube made of such plastic. The material of the coating resin layer 110 is preferably a non-vinyl chloride material that is environmentally friendly, such as a polystyrene shrink film, a polyolefin shrink film, a polyester shrink film, or a polypropylene shrink film.

  The push wheel 24 is positioned and held at the initial position described above by the first positioning and holding mechanism. Thereby, even if an unexpected force acts on the pusher wheel 24 in the half-inserted state, it is difficult to be pushed into the joint body 20.

  The second positioning and holding mechanism is configured by the snap ring housing and holding groove 84 of the push ring 24, the snap ring 106, and the second snap ring engaging groove 92 of the joint body 20. As described above, the second snap ring engagement groove 92 is formed on the inner periphery of the receiving portion 30, and the second snap ring engagement groove 92 is inserted into the insertion opening 40 more than the first snap ring engagement groove 90. It is arranged side by side at a position far from the center. After the covering resin layer 110 is removed, when the push ring 24 in a half-inserted state is pushed into the insertion port 40, the snap ring 106 slides out from the groove tapered surface 90a of the first snap ring engaging groove 90. Thereafter, when the push ring 24 is further pushed, the snap ring 106 is fitted into the second snap ring engaging groove 92. Thereby, the front-end | tip part of the press ring 24 is positioned and hold | maintained in a perfect pushing position. As described above, FIG. 3 shows a state in which the snap ring 106 is fitted in the second snap ring engaging groove 92.

  Note that the stroke length S (see FIG. 2), which is the pushing allowance of the push ring 24, is substantially equal to the distance between the first snap ring engaging groove 90 and the second snap ring engaging groove 92. Is set.

  Next, the point which connects the flexible pipe 300 to the flexible pipe joint 10 mentioned above is demonstrated, referring FIGS. 1-3.

  As shown in FIG. 1, when the flexible pipe joint 10 is in stock, stored, or transported before the flexible pipe 300 is connected, the first positioning and holding mechanism is inadvertently pushed into the half-inserted push ring 24. Is less likely to occur. That is, the occurrence of the above-described situation is prevented by the engaging action between the outer peripheral portion of the snap ring 106 and the first snap ring engaging groove 90 and the supporting action of the coating resin layer 110 provided in the insertion-scheduled portion 77. The

  When connecting the flexible tube 300, first, the flexible tube 300 (the synthetic resin layer 314 at the tip of the flexible tube 300 is peeled off in advance. As a result, the peak portion 310 of the flexible tube 300 is exposed. ) Is inserted into the insertion port 40 of the joint body 20 from the inlet side of the pusher wheel 24. The flexible tube 300 passes through the sealing material 22 in the order of the retaining portion 60e, the connecting portion 60d, the single annular portion 60c, and the trunk portion 60a. Thereafter, the distal end portion of the flexible tube 300 abuts on the tube end receiving portion 60 b of the sealing material 22. At this time, since the single annular portion 60c of the sealing material 22 is formed so as to protrude outward, the single annular portion 60c does not become an obstacle when the flexible tube 300 is inserted. The distal end portion of the flexible tube 300 can be smoothly inserted into the sealing material 22.

  When the flexible tube 300 is inserted until it comes into contact with the tube end receiving portion 60 b of the sealing material 22, the trunk portion 60 a of the sealing material 22 is pushed into the second housing portion 44. Along with this pushing, the single annular portion 60 c of the sealing material 22 moves to the narrow side of the sealing material diameter-reducing guide portion 48. The single annular portion 60c is pressed by the sealing material diameter reducing guide portion 48 and is reduced in diameter inwardly. The single annular portion 60 c engages with the valley portion 312 of the flexible tube 300 as soon as it passes through the seal material diameter reducing guide portion 48 and is drawn into the second accommodating portion 44. At that time, the single annular portion 60 c is in close contact with the inclined surface 312 a of the valley portion 312. At the same time, the retaining portion 60 e of the sealing material 22 moves to the narrow side of the retaining diameter reducing guide portion 50. The retaining portion 60e is pulled into the first accommodating portion 42 while being pushed in the diameter reducing direction by the retaining diameter reducing guide portion 50. As a result, as shown in FIG. 2, the seal material 22 reliably seals the space between the outer peripheral surface of the distal end portion of the flexible tube 300 and the inner peripheral surface of the second housing portion 44 of the joint body 20. By being hermetically sealed, the fluid flowing in the flexible tube 300 leaks from the distal end portion of the flexible tube 300 through the outer periphery of the distal end portion of the flexible tube 300 and the inner periphery of the second housing portion 44 of the joint body 20. Can be prevented. Even if the flexible tube 300 is slightly deformed, the effect is hardly lowered. Note that a sealing function can also be expected between the distal end portion of the flexible tube 300 and the tube end receiving portion 60 b of the sealing material 22.

  Subsequently, when the flexible tube 300 is inserted until it comes into contact with the tube end receiving portion 60b of the sealing material 22, the inner diameter portion of the tube end receiving portion 60b of the sealing material 22 and the inner surface of the distal end portion of the flexible tube 300 are engaged with the tip. Engage with the check claw 72 b of the member 70. The inner diameter portion of the pipe end receiving portion 60b of the sealing material 22 and the inner surface of the distal end portion of the flexible tube 300 are engaged with the check pawl 72b. This is after the inner surface of the tip portion has passed between the check claw 72b and the inner peripheral surface of the second housing portion 44. The check claw 72b is elastically deformed while the inner diameter portion of the tube end receiving portion 60b of the sealing material 22 and the inner surface of the distal end portion of the flexible tube 300 are passing. When this pipe end receiving part 60b passes the check claw 72b, the installer feels a response. Thereby, the installer can feel that the flexible tube 300 has been inserted to a predetermined depth.

  Furthermore, the flexible tube 300 can be prevented from swinging because the distal end portion of the flexible tube 300 engages with the check pawl 72 b of the distal end latching member 70 and the retaining portion 60 e enters the valley portion 312. . 2 shows that the inner diameter portion of the tube end receiving portion 60b of the sealing material 22 and the inner surface of the distal end portion of the flexible tube 300 pass between the check pawl 72b and the inner peripheral surface of the second accommodating portion 44, and the flexible tube The situation where the tip of 300 hits the stopper portion 46 is shown.

  After the insertion of the flexible tube 300 is completed, the coating resin layer 110 is removed from the pusher wheel 24. When the covering resin layer 110 is removed, the pusher wheel 24 is completely pushed in by the pushing allowance (the stroke length S shown in FIG. 2). With this pushing, the snap ring 106 is moved along the groove taper surface 90a of the first snap ring engaging groove 90 of the joint body 20 in a state where the inner peripheral portion is fitted in the snap ring receiving and holding groove 84. The first snap ring engaging groove 90 slides out. Since it moves along the groove taper surface 90a, the snap ring 106 is elastically deformed to reduce its diameter. Then, when the push ring 24 is completely pushed in, the outer peripheral portion of the snap ring 106 is fitted into the second snap ring engaging groove 92. When the outer peripheral portion of the snap ring 106 is fitted into the second snap ring engaging groove 92, the diameter of the snap ring 106 that has been reduced in diameter is increased. Thereby, it is possible to prevent the sealing material 22 from moving back toward the inlet side of the receiving port 30. FIG. 3 shows a state where the pusher wheel 24 is completely pushed. The front end of the push ring 24 is held at a complete pushing position located on the rear side of the retaining portion 60e of the sealing material 22. At this time, as clearly shown in FIG. 3, the sealing state by the sealing material 22 is secured.

  Further, as the push ring 24 is completely pushed in, the push ring tapered surface 82b at the tip of the push ring 24 comes close to and faces the outer peripheral tapered surface 62 of the retaining portion 60e of the sealing material 22. Thereafter, when a pulling force is applied to the flexible pipe 300 in the pulling direction from the joint body 20, the outer peripheral tapered surface 62 slightly moves in the direction of the insertion port 40 and comes into contact with the pusher wheel tapered surface 82 b. When the outer peripheral taper surface 62 comes into contact with the presser wheel taper surface 82b, the outer peripheral taper surface 62 receives a reaction force from the presser wheel taper surface 82b. When the outer peripheral tapered surface 62 receives a reaction force from the presser wheel tapered surface 82b, the fitting portion 63 arranged on the back side of the outer peripheral tapered surface 62 as a part of the retaining portion 60e is fitted into the valley 312 of the flexible tube 300. . The outer peripheral tapered surface 62 receives a reaction force from the presser wheel tapered surface 82b, and the fitting portion 63 transmits the reaction force to the trough 312 of the flexible tube 300, so that the flexible tube 300 is prevented from coming off.

<Second Embodiment>
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a half-broken cross-sectional view showing the flexible pipe joint according to the second embodiment of the present invention in a state before the sealing material 23 is pushed. FIG. 6 is a half-broken cross-sectional view of the joint for flexible pipe shown in a state in which the sealing material 23 is being pushed in. FIG. 7 is a half cutaway cross-sectional view of the joint for flexible pipe shown in a state after the insertion of the flexible pipe is completed.

  As shown in FIG. 5, the flexible pipe joint 12 according to the present embodiment includes a joint body 21, a seal material 23, a push ring 24, and the like. A receiving portion 31 is formed at one end of the joint body 21. A connecting male screw 32 is formed on the outer periphery of the other end of the joint body 21. The receiving portion 31 is a portion that receives the distal end portion of the metal flexible tube 300. The seal material 23 is accommodated inside the receiving portion 31 of the joint body 21. The push ring 24 is inserted into a semi-inserted state in which a pushing allowance is left in the receiving portion 31.

  As shown in FIG. 5, an insertion port 41, a first accommodation portion 42, and a second accommodation portion 44 are provided in the receiving portion 31 of the joint body 21.

  As shown in FIG. 5, the sealing material 23 includes a body portion 61a, a pipe end receiving portion 60b, a first annular portion 61c, a second annular portion 61g, a connecting portion 60d, and a retaining portion 60e. The trunk portion 61a, the pipe end receiving portion 60b, the first annular portion 61c, the second annular portion 61g, the connecting portion 60d, and the retaining portion 60e are integrated. The trunk | drum 61a is cylindrical. The length of the trunk | drum 61a is shorter than the trunk | drum 60a in 1st Embodiment. The first annular portion 61c and the second annular portion 61g are annular. The annular portions 61c and 61g are arranged so as to be aligned in the central axis direction of the sealing material diameter-reducing guide portion 48 and the first accommodating portion 42. The first annular portion 61c projects outward from the rear end portion of the trunk portion 61a. The second annular portion 61g is connected to the rear end portion of the first annular portion 61c. The interval between the first annular portion 61 c and the second annular portion 61 g is substantially the same as the interval between the valley portions 312 of the flexible tube 300. The first annular portion 61c and the second annular portion 61g play substantially the same role as the single annular portion 60c according to the first embodiment. The connecting portion 60d is provided behind the second annular portion 61g, and connects the second annular portion 61g and the retaining portion 60e.

  The trunk portion 61a, the first annular portion 61c, the second annular portion 61g, and the connecting portion 60d are made of rubber. Examples of the rubber used as these materials are the same as those in the first embodiment.

  The sealing material 23 is arranged as shown in FIG. 5 before the flexible tube 300 is inserted (initial state). That is, in the initial state, the tube end receiving portion 60b and the trunk portion 61a are located in the second accommodating portion 44, the first annular portion 61c and the second annular portion 61g are located in the first accommodating portion 42, and are retained. The sealing material 23 is disposed so that the portion 60e is located in the insertion port 41.

  Other parts are the same as those in the first embodiment. The function about them is the same. Therefore, detailed description thereof will not be repeated here.

  Next, a procedure for connecting the flexible pipe 300 to the above-described flexible pipe joint 12 will be described with reference to FIGS.

  As shown in FIG. 5, when the flexible pipe joint 12 is stocked / stored or transported before the flexible pipe 300 is connected, the first positioning / holding mechanism is inadvertently pushed into the half-inserted push ring 24. Is less likely to occur.

  When connecting the flexible tube 300, first, the flexible tube 300 is inserted into the insertion port 41 of the joint body 21 from the inlet side of the pusher wheel 24. The flexible tube 300 passes through the sealing material 23 in the order of the retaining portion 60e, the connecting portion 60d, the second annular portion 61g, the first annular portion 61c, and the trunk portion 60a. Thereafter, the distal end portion of the flexible tube 300 comes into contact with the tube end receiving portion 60 b of the sealing material 23. At this time, the first annular portion 61c and the second annular portion 61g are formed so as to project outward, so that they do not become an obstacle when the flexible tube 300 is inserted. The distal end portion of the flexible tube 300 can be smoothly inserted into the sealing material 23.

  When the flexible tube 300 is inserted until it comes into contact with the tube end receiving portion 60 b of the sealing material 23, the sealing material 23 is pushed into the second housing portion 44 by the flexible tube 300. Along with this pushing, the first annular portion 61 c of the sealing material 23 moves to the constricted side of the sealing material diameter-reducing guide portion 48. The first annular portion 61c is pressed by the sealing material diameter-reducing guide portion 48 and is reduced in diameter inwardly. The first annular portion 61 c engages with the valley portion 312 of the flexible tube 300 as soon as it passes through the seal material diameter reducing guide portion 48 and is drawn into the second accommodating portion 44.

  While the first annular portion 61c moves along the sealing material diameter-reducing guide portion 48, the second annular portion 61g moves toward the second accommodation portion 44 along the inner peripheral surface of the first accommodation portion 42. doing. When the first annular portion 61c engages with the valley portion 312 of the flexible tube 300, the second annular portion 61g starts to engage with the valley portion 312 adjacent to the valley portion 312 with which the first annular portion 61c is engaged. Thereafter, when the second annular portion 61g that has passed through the first accommodating portion 42 moves along the seal material diameter reducing guide portion 48, the second annular portion 61g is pushed by the seal material diameter reducing guide portion 48. The diameter is reduced inwardly. Thereafter, the second annular portion 61g engages with the valley portion 312 of the flexible tube 300 as soon as it passes through the seal material diameter reducing guide portion 48 and is drawn into the second accommodating portion 44. As a result, as shown in FIG. 6, the seal material 23 reliably seals the space between the outer peripheral surface of the distal end portion of the flexible pipe 300 and the inner peripheral surface of the second housing portion 44 of the joint body 21. At that time, the first annular portion 61 c is in close contact with the inclined surface 312 a of the valley portion 312. The second annular portion 61g is also in close contact with the inclined surface 312a of the valley portion 312. When they are in close contact with each other, the possibility that the fluid flowing in the flexible pipe 300 leaks is lower than that of the joint for flexible pipe 10 according to the first embodiment.

  While the first annular portion 61c and the second annular portion 61g are moving, the retaining portion 60e of the sealing material 23 moves to the constricted side of the retaining diameter reducing guide portion 50. The retaining portion 60e moves to the first accommodating portion 42 while being pushed in the diameter reducing direction by the retaining diameter reducing guide portion 50.

  Further, as shown in FIG. 6, when the flexible tube 300 is inserted until it contacts the tube end receiving portion 60 b of the sealing material 23, the inner diameter portion of the tube end receiving portion 60 b of the sealing material 23 and the distal end portion of the flexible tube 300. Is engaged with the check pawl 72b of the tip latch member 70.

  After the insertion of the flexible tube 300 is completed, the coating resin layer 110 is removed from the pusher wheel 24. When the covering resin layer 110 is detached, the pusher wheel 24 is completely pushed in by the pushing amount. Thereby, it can prevent that the sealing material 23 returns and moves to the entrance side direction of the receiving part 31. FIG. FIG. 7 shows a state where the pusher wheel 24 is completely pushed. The front end portion of the push ring 24 is held on the rear side of the retaining portion 60e of the sealing material 23. Therefore, the sealing state by the sealing material 23 is ensured.

  In addition, as the push ring 24 is completely pushed, even if an external force in the direction of pulling out the flexible tube 300 is applied thereafter, the flexible tube 300 is reliably prevented from coming out. The principle is the same as in the first embodiment.

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

  For example, in the present invention, the receiving portion 30 or the receiving portion 31 is formed at one end of the joint body 20 or the joint body 21, and the connecting male screw 32 is formed on the outer periphery of the other end of the joint body 20 or the joint body 21. It is not limited to male threaded flexible pipe joints. Needless to say, the present invention can be applied to other structures, for example, symmetrical socket-type joints for flexible pipes having elbows at both ends, elbow-type joints for flexible pipes, and the like.

  Further, the present invention is not limited to the case where the sealing material seals one or two of the valley portions 312 of the flexible tube 300. There may be three or more portions of the sealing material that are in close contact with the valley 312 of the flexible tube 300.

  In the present invention, if the inner diameter of the body portion 60a is equal to or less than the outer diameter of the flexible tube 300, the tube end receiving portion 60b and the reinforcing metal core 60f are not necessarily required. This is because the sealing material is drawn into the second housing portion of the joint body by the frictional force acting between the body portion 60a and the flexible tube 300. When the tube end receiving portion 60b and the reinforcing metal core 60f are not provided, the tip latching member 70 is not necessary.

  In the second embodiment, the interval between the first annular portion 61 c and the second annular portion 61 g may be smaller than the interval between the valley portions 312 of the flexible tube 300. This is because the gap between the first annular portion 61c and the second annular portion 61g is widened by elastic deformation when engaging with the trough 312 of the flexible tube 300.

It is a half notched cross-sectional view which shows the coupling for flexible pipes concerning the 1st Embodiment of this invention in the state before pushing in sealing material. It is a half notched cross-sectional view of the joint for flexible pipes shown in the state where the sealing material push-in is completed. It is a half notched cross-sectional view of the joint for flexible pipes shown in a state after completion of insertion of the flexible pipes. (A) is a half cutaway cross-sectional view of the sealing material, (b) is a rear view of the sealing material, and (c) is a side view of the sealing material. It is a half notched cross-sectional view which shows the coupling for flexible pipes concerning the 2nd Embodiment of this invention in the state before pushing in sealing material. It is a half notched cross-sectional view of the joint for flexible pipes shown in the state where the sealing material push-in is completed. It is a half notched cross-sectional view of the joint for flexible pipes shown in a state after completion of insertion of the flexible pipes. It is a half notched cross-sectional view of the joint for flexible pipes of the first conventional example. (A) is sectional drawing which shows the joint for flexible pipes of a 2nd prior art example in the state in the middle of flexible tube insertion, (B) is sectional drawing which shows the joint for flexible pipes in the state after completion of flexible pipe insertion.

DESCRIPTION OF SYMBOLS 10,12 Flexible pipe joint 20,21 Joint main body 22,23 Seal material 24,210,254 Push ring 30,31 Receiving part 32 Connection male screw 40,41 Insertion port 42 First accommodating part 44 Second accommodating part 46 Stopper part 48 Sealing material diameter-reducing guide part 50 Stopping diameter-reducing guide part 60a, 61a Body part 60b Pipe end receiving part 60c Single annular part 60d Connection part 60e Detachment part 60f Reinforcing core 60h Pipe insertion hole 61c First annular part 61g Second Annular part 62 Peripheral taper surface 63 Insertion part 70 Tip latching member 72a Ring part 72b Non-return claw 74a Circumferential groove 76a Cylindrical part 76b Ridge part 77 Fit-in part 78 Packing groove 80, 102 Waterproof packing 82a Guide taper surface 82b Push ring taper Surface 84 Snap ring housing holding groove 86 Waterproof packing groove 90 First snap ring engagement Joint groove 90a Groove taper surface 92 Second snap ring engagement groove 94 Fireproof packing groove 100 Selectable permeable member 104 Fireproof packing 106 Snap ring 110 Covering resin layer 200,250 Joint body 200a Large diameter hole 200b Medium diameter hole 200c Small diameter hole 202 Sleeve 204 Ring spring 206 Ring 208 Packing 252 Retainer member 252a Rear projection 256 Waterproof packing 258 Stop ring member 260 First groove 262 Second groove 264 Third groove 270 Pipe insertion hole 300 Flexible pipe 310 Mountain part 312 Valley part 312a Slope 314 Composite Resin layer S Stroke length

Claims (1)

In the joint for flexible pipes connecting the flexible pipes in which the crests and troughs extending in the circumferential direction all around the outer circumference are alternately arranged in the pipe axis direction,
A joint body in which an insertion port for inserting the flexible tube is formed and the inner wall surface is formed in a stepped shape including a reduced diameter stepped portion,
A sealing material provided movably in the joint body;
A push wheel provided on the insertion port side of the joint body and movable in the insertion port;
A snap ring for positioning and holding the push wheel when the push wheel is pushed into the joint body,
The sealing material has a tube end receiving portion that comes into contact with a tip portion of the flexible tube when the flexible tube is inserted into the joint body;
The press ring has a press ring taper surface that fits into a trough portion of the flexible tube, when a pulling force is applied to the flexible tube, and prevents the flexible tube from coming out.
By inserting the flexible pipe into the joint body, the sealing material is pushed into the back side of the joint body, and a sealing action part in contact with the outer peripheral surface of the flexible pipe in the sealing material is the reduced diameter step part. As soon as the sealing action part gets over the reduced diameter step part, the sealing action part comes into close contact with the area closer to the valley part than the peak part of the slope of the valley part of the flexible tube. This is a flexible pipe joint.

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