WO2010087406A1

WO2010087406A1 - Joint for flexible pipe

Info

Publication number: WO2010087406A1
Application number: PCT/JP2010/051149
Authority: WO
Inventors: 裕司岸本; 剛年東野; 充志木村; 陽介植田
Original assignee: Ｊｆｅ継手株式会社
Priority date: 2009-01-30
Filing date: 2010-01-28
Publication date: 2010-08-05

Abstract

A joint for a flexible pipe, the joint being configured in such a manner that a flexible pipe having a tip portion with a deformed cross-sectional shape is prevented to a certain degree from being connected to the joint. A joint (10) for a flexible pipe is provided with a joint body (20), a seal member (22), and a pressing ring (24). The pressing ring (24) has an inlet section (79a) into which a coating layer of the flexible pipe enters and also has a body communication section (79b). The inlet section (79a) allows the tip portion of the flexible pipe to penetrate therethrough and also allows the coating layer of the flexible pipe to enter thereinto. The body communication section (79b) is, when the pressing ring (24) is inserted in the joint body (20), positioned further toward the joint body (20) side than the inlet section (79a). A circular opening (87) through which the flexible pipe passes and which has a diameter smaller than the outer diameter of the coating layer and greater than the outer diameter of crests of the flexible pipe is provided in that portion of the body communication section (79b) which is a boundary contiguous to the inlet section (79a).

Description

Fitting for flexible pipe

The present invention relates to a joint for flexible pipes, and more particularly, to a joint for flexible pipes that can prevent to some extent the connection of a flexible pipe whose cross-sectional shape is deformed at the tip.

Patent Document 1 discloses a flexible pipe joint as shown in FIG. This flexible pipe joint includes a joint body 250, a retainer member 252, a push wheel 254, and a waterproof packing 256.

The flexible pipe 300 is inserted into the joint body 250. The flexible pipe 300 is formed by alternately arranging crests 310 and troughs 312 extending in the circumferential direction on the outer peripheral part in the pipe axis direction and covering the outer periphery with a coating layer 314 such as vinyl chloride. is there.

The retainer member 252 is disposed in the joint main body 250. 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 push ring 254 is fixed in a state where the rear protrusion 252a of the retainer member 252 is 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 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 FIG. 7 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 snap ring 258, a first groove 260, a second groove 262, and a third groove 264.

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

When the outer peripheral portion of the snap ring 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 snap ring 258 is engaged 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.

The flexible pipe joint shown in FIG. 7 includes a ring member 280 for disassembly. The joint body 250 is provided with an expansion step 270. When it becomes necessary to remove the flexible tube 300 once it has been connected, the disassembling ring member 280 is removed, and the push ring 254 is further pushed. When the push ring 254 is further pushed, the snap ring 258 fitted in the second groove 262 is also pushed into the expansion step portion 270. Since the diameter of the snap ring 258 is reduced by elastic deformation while the second ring 262 is fitted, the diameter of the snap ring 258 pushed into the expansion step 270 is expanded. Since the diameter increases, when the snap ring 258 is pushed into the expansion step 270, the lock of the pusher wheel 254 is released.

According to this flexible pipe joint, the state where the presser wheel 254 is locked to the joint main body 250 can be released.

JP 2003-176888 A

An object of the present invention is to provide a joint for a flexible pipe that can prevent the flexible pipe 300 having a deformed cross-sectional shape at the tip portion from being connected to some extent.

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 an insertion port 30, a sealing material 22, and a push ring 24. The sealing material 22 can be elastically deformed. The sealing material 22 is accommodated in the joint body 20. The pusher wheel 24 is inserted into the joint body 20 through the insertion port 30. The flexible tube 300 is inserted into the joint body 20 from the insertion port 30. The flexible tube 300 passes through the push wheel 24. 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. A coating layer 314 is provided on the outer periphery of the flexible tube 300. The tip portion of the flexible tube 300 is exposed. A tube insertion hole 63 is formed in the center of the sealing material 22. The flexible tube 300 is inserted into the tube insertion hole 63. The sealing material 22 seals between the outer peripheral surface of the flexible tube 300 and the inner peripheral surface of the joint body 20 in the joint body 20.

The push ring 24 has a coating layer entry portion 79a and a main body communication portion 79b. In the coating layer entry portion 79a, the distal end portion of the flexible tube 300 penetrates, and the coating layer 314 enters. The main body communication portion 79b is disposed closer to the joint body 20 than the coating layer entry portion 79a when the pusher wheel 24 is inserted into the joint body 20. A circular opening having a diameter smaller than the outer diameter of the covering layer 314 and larger than the outer diameter of the peak portion 310 of the flexible pipe 300 passes through the flexible pipe 300 at a boundary portion of the main body communication portion 79b with the covering layer entry portion 79a. 87 is provided.

The distal end portion of the flexible tube 300 penetrates the coating layer entry portion 79a, and the coating layer 314 enters. The flexible tube 300 that has entered the coating layer entry portion 79a tends to pass through the circular opening 87 of the main body communication portion 79b. At this time, the diameter of the circular opening 87 is smaller than the outer diameter of the covering layer 314 and larger than the outer diameter of the peak portion 310 of the flexible tube 300. Therefore, depending on the degree of deformation of the cross-sectional shape, the distal end portion of the flexible tube 300 may not pass through the circular opening 87. Thereby, the flexible pipe 300 whose cross-sectional shape is deformed so that it cannot pass through the circular opening 87 is prevented from being connected to the joint 10 for flexible pipe. When the distal end portion of the flexible tube 300 passes through the circular opening 87, the distal end portion of the flexible tube 300 penetrates the coating layer entry portion 79a, enters the main body communication portion 79b, and penetrates. The flexible tube 300 that passes through the main body communication portion 79 b and passes through the pusher wheel 24 is inserted into the tube insertion hole 63 at the center of the seal material 22. Thereby, the space between the outer peripheral surface of the flexible tube 300 and the inner peripheral surface of the joint body 20 is sealed by the sealing material 22 in the joint body 10.

Moreover, it is preferable that the main body communication part 79b described above has the abutting part 88. The abutting portion 88 is disposed at a boundary portion with the covering layer entering portion 79a, and the tip of the covering layer 314 is abutted.

According to the present invention, it is possible to prevent to some extent that the flexible tube 300 whose tip portion has a deformed cross-sectional shape is connected.

It is a half notched sectional view showing a joint for flexible pipes according to an example of the present invention. (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 an enlarged view of the front-end | tip part of a protrusion member. It is a perspective view of a push ring. It is a figure which shows operation | movement of the joint for flexible pipes when the flexible pipe | tube with an appropriate length of an exposed part is inserted. It is a figure which shows operation | movement of the joint for flexible pipes when the flexible pipe | tube with which the length of an exposed part is insufficient is inserted. It is a half notched cross-sectional view of the joint for flexible pipes of the conventional example.

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.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a half-broken cross-sectional view showing a flexible pipe joint 10 according to an embodiment of the present invention in a state before the sealing material 22 is pushed. FIG. 2A is a cross-sectional view of the sealing member 22 in a half cutout. FIG. 2B is a rear view of the sealing material 22. FIG. 2C is a side view of the sealing material 22. FIG. 3 is an enlarged view of the distal end portion of the disturbing portion 64. FIG. 4 is a perspective view of the push wheel 24. (A) of FIG. 5 is the half cut-off cutting | disconnection which shows the joint 10 for flexible pipes concerning the Example of this invention in the state before pushing in the sealing material 22 when the flexible pipe | tube with an appropriate length of an exposed part is inserted. FIG. (B) of FIG. 5 is a half-broken cross-sectional view of the flexible pipe joint 10 shown in a state where the sealing material 22 is being pushed. FIG. 5C 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. 6 (a) is a half-notch cut-away view showing the flexible pipe joint 10 according to the embodiment of the present invention in a state before the sealing material 22 is pushed in when the flexible pipe 300 whose exposed portion is insufficient in length is inserted. FIG. FIG. 6B is a half-notch cross-sectional view showing the flexible pipe joint 10 shown in FIG. FIG. 6C is a half-broken cross-sectional view showing the flexible pipe joint 10 shown in FIG. 6A in a state after the insertion of the flexible pipe 300 is completed.

As shown in FIG. 1, the flexible pipe joint 10 according to this embodiment includes a joint body 20, a seal material 22, a push ring 24, a snap ring 26, and the like. An insertion port 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 insertion port 30 is a port that receives the tip of the metal flexible tube 300. The sealing material 22 is accommodated in the joint body 20 through the insertion port 30 of the joint body 20. The pusher wheel 24 is connected to the joint body 20 in a temporarily inserted state that leaves a pushing allowance. The pusher wheel 24 is disposed closer to the insertion port 30 than the sealing material 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.

As shown in FIG. 1, the inside of the joint body 20 communicates with the outside of the joint body 20 through the insertion port 30. In the description of the present invention, “communication” means that two spaces are made continuous through a passage. The “passage” here includes not only a tubular shape but also a simple hole. The flexible tube 300 passes through the pusher wheel 24 and is inserted into the joint body 20 from the insertion port 30. Inside the joint body 20, a first housing portion 42, a second housing portion 44, a sealing material diameter-reducing guide portion 46, and a third housing portion 48 are provided. Among these, the first accommodating portion 42 is located closest to the insertion port 30. Among these, the innermost side is the third accommodating portion 48. The first accommodating portion 42 is formed at the back of the insertion port 30 and communicates with the insertion port 30. The second storage portion 44 is formed in the back of the first storage portion 42 and communicates with the first storage portion 42. The seal material diameter-reducing guide portion 46 is formed at the back of the second housing portion 44. The seal material diameter-reducing guide portion 46 is narrowed away from the second housing portion 44. The third accommodating portion 48 is formed at the back of the sealing material diameter reducing guide portion 46. The third accommodating portion 48 accommodates the distal end portion of the flexible tube 300 and the sealing material 22 on the outer periphery of the distal end portion.

The first accommodating part 42 has a grooved part 54 and a retaining diameter reducing guide part 56. The grooved portion 54 communicates with the insertion port 30. In the present embodiment, the grooved portion 54 has a circular cross section. The retaining diameter reducing guide portion 56 is provided at a boundary portion with the second housing portion 44. The removal-reducing diameter guide portion 56 is narrowed away from the insertion port 30.

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

A fireproof packing groove 96 is provided on the inner periphery of the second housing portion 44 so as to surround the outer periphery of the sealing material 22. A fireproof packing 104 is fitted in the fireproof packing groove 96. In this embodiment, the fireproof packing 104 is made of rubber with thermally expandable graphite.

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

As shown in FIGS. 2A to 2C, the sealing material 22 according to this embodiment includes an engaging portion 61 and a sealing action portion 62. A tube insertion hole 63 is formed in the center of the sealing material 22. The flexible tube 300 is inserted into the tube insertion hole 63. The engaging portion 61 is a portion that moves the sealing material 22 to the insertion completion position of the joint body 20 (in the present embodiment, the third accommodating portion 48) by being pushed by the flexible tube 300 inserted from the tube insertion hole 63. is there. The sealing action part 62 projects outward from the rear end part of the body part 60a. 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 trunk part 60a and a pipe end receiving part 60b. 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 flexible pipe 300 is inserted into the joint body 20, the pipe end receiving portion 60 b hits the tip of the flexible pipe 300.

A plurality of blocking portions 64 are provided on the rear side of the sealing material 22, that is, on the side closer to the insertion port 30 than the engaging portion 61. These disturbing portions 64 are arranged in a circumferential direction. The disturbing portions 64 are separated from each other by a predetermined interval. When the sealing material 22 is accommodated in the joint body 20, the diameter of the space surrounded by the blocking portion 64 is larger than the outer diameter of the peak portion 310 of the flexible pipe 300. When the blocking member 64 is located at a position before the sealing material 22 has reached the insertion completion position of the joint body 20 (in the present embodiment, the position shown in FIG. 1), When pushed, it stands in front of the push ring 24 and prevents the snap ring 26 fitted in the push ring recess 84 from being fitted into the main body recess 94.

In the present embodiment, the engaging part 61 and a part of the disturbing part 64 (parts other than the intervention part 70 described later) are integrated.

In the case of the present embodiment, the body portion 60a, the pipe end receiving portion 60b, the sealing action portion 62, and a part of the blocking portion 64 are made of rubber. Examples of rubbers used as these materials include NBR (Acrylonitrile-Butadiene rubber), SBR (Styrene-butadiene rubber), EPDM (ethylene propylene rubber) and the like.

A reinforcing cored bar 60f such as a brass washer is embedded in the pipe end receiving part 60b. The material of the pipe end receiving portion 60b may be formed of the same material as that of the body portion 60a and the sealing action portion 62, or may be formed of a different material.

As shown in FIG. 3, an intervention unit 70 is provided at the tip of the blocking unit 64. When the intervention unit 70 is pushed by the push wheel 24, the intervention unit 70 stands in front of the push wheel 24. In addition, the intervention unit 70 engages with the valley 312 of the flexible tube 300. The intervention part 70 is made of a material harder than the body part 60 a and the sealing action part 62. Examples of such materials include metal materials such as brass and hard resins.

The intervention part 70 has a restraining part 70a, a retaining part 70b, and a meshing concave part 70c. The restraining portion 70a is pressed against the retaining diameter reducing guide portion 56 by a distal end portion 82a described later (for this reason, the retaining diameter reducing guide portion 56 receives the intervention portion 70). As is clear from FIGS. 1 and 5, the restraining portion 70 a has a portion whose inner diameter is larger than the distal end surface 106 b of the pusher wheel 24 described later. When viewed from the insertion port 30 side, the retaining portion 70b is disposed on the back side of the outer peripheral tapered surface 71 described later. The retaining portion 70 b moves from the first accommodating portion 42 into the second accommodating portion 44 as the engaging portion 61 is pushed into the third accommodating portion 48. The retaining portion 70 b fits on the outer periphery of the flexible tube 300 as it moves from the first housing portion 42 into the second housing portion 44. The meshing recessed part 70c is a recessed part formed by the restraining part 70a and the retaining part 70b. The obstructing portion 64 is an obstructing position in the first accommodating portion 42 (a position where the snap ring 26 is prevented from fitting into the main body recessed portion 94. In this embodiment, the position shown in FIG. 5A). When the pusher wheel 24 is pushed into the joint body 20, a distal end portion 82a, which will be described later, fits into the engaging recess 70c.

The restraining portion 70a has an outer peripheral tapered surface 71. The outer peripheral tapered surface 71 faces the tip end portion 82 a when the trunk portion 60 a is pushed into the inner side of the third housing portion 48 and the pusher wheel 24 is pushed into the joint body 20. When the pulling force is applied to the flexible tube 300 in a state where the pusher wheel 24 is pushed into the joint body 20, the outer peripheral tapered surface 71 comes into contact with a reaction force part 82 b described later in the tip part of the pusher wheel 24.

The sealing material 22 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 60b and the trunk portion 60a are located in the third accommodating portion 48, the sealing action portion 62 is located in the second accommodating portion 44, and the obstruction portion 64 is the first obstructing portion 64. The sealing material 22 is disposed so as to be located at the obstructing position in the accommodating portion 42.

As shown in FIG. 4, the pusher wheel 24 has a cylindrical portion 76a and a flange portion 76b. The cylindrical portion 76a and the flange portion 76b are integrated. The cylindrical portion 76 a is inserted into the joint body 20. In the insertion port 30, the cylinder part 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 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 30.

Inside the push ring 24, a coating layer entry portion 79a and a main body communication portion 79b are provided. In the coating layer entry portion 79a, the distal end portion of the flexible tube 300 penetrates, and the coating layer 314 enters. The main body communication portion 79b is disposed closer to the joint body 20 than the coating layer entry portion 79a when the pusher wheel 24 is inserted into the joint body 20. A circular opening having a diameter smaller than the outer diameter of the covering layer 314 and larger than the outer diameter of the peak portion 310 of the flexible pipe 300 passes through the flexible pipe 300 at a boundary portion of the main body communication portion 79b with the covering layer entry portion 79a. 87 is provided.

The cylinder 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 a direction orthogonal to the central axis of the cylindrical portion 76a. As shown in FIG. 1, 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 tip portion 82 a is provided in a portion of the cylindrical portion 76 a that faces the blocking portion 64. As will be apparent from the following description, the distal end portion 82a interferes with the inner peripheral surface of the first accommodating portion 42 when the cylindrical portion 76a is pushed into the joint body 20 when the obstructing portion 64 is disposed at the obstructing position. The part 64 is pressed. More specifically, in the case of the present embodiment, it is the retaining diameter reducing guide portion 56 of the first housing portion 42 that receives the obstructing portion 64 that has been pressed.

The tip portion 82a has an inclined surface 106a and a tip surface 106b. The shape of the inclined surface 106a is a tapered shape. As a result, the inclined surface 106a is narrowed as it approaches the tip of the cylindrical portion 76a. The slope of the inclined surface 106 a in this embodiment is substantially the same as that of the retaining diameter reducing guide portion 56 provided in the joint body 20. The front end surface 106b of the present embodiment is a flat surface disposed at the front end of the cylindrical portion 76a. Of course, the tip surface 106b may be a curved surface or other surfaces. Incidentally, the inner diameter at the end on the center side of the cylindrical portion 76 a in the distal end surface 106 b is equal to or larger than the inner diameter of the second housing portion 44.

A reaction force portion 82b is provided on the inner periphery of the tip portion of the cylindrical portion 76a that faces the blocking portion 64. The reaction force portion 82 b has a shape that expands toward the back of the insertion port 30.

As shown in FIG. 4, a push wheel recess 84 is provided on the surface of the cylindrical portion 76 a that faces the inner periphery of the joint body 20. The push wheel recess 84 is formed in a direction orthogonal to the central axis of the cylindrical portion 76a.

A waterproof packing groove 86 is provided in a portion of the cylindrical portion 76a closer to the inlet side than the push wheel dent portion 84. The waterproof packing 102 is fitted in the waterproof packing groove 86.

As shown in FIG. 1, a malfunction preventing collar 110 is fitted in the insertion planned portion 77. The insertion-scheduled portion 77 means that the outer periphery of the snap ring 26 is exposed from the joint main body 20 when the outer periphery of the snap ring 26 is fitted in the snap ring temporary fixing groove 92 in the cylindrical portion 76a of the push ring 24, and the outer periphery of the snap ring 26 is the main body. It is a portion arranged in the insertion port 30 when fitted in the recess 94. As a result, the flange portion 76b faces the joint body 20 with the insertion-scheduled portion 77 interposed therebetween. The malfunction prevention collar 110 has an edge portion, and has a thickness larger than a gap between the inner peripheral surface of the insertion port 30 and the cylindrical portion 76a of the push ring 24.

Note that the stroke length S (see FIG. 5B), which is the pushing allowance of the push ring 24, is set to be substantially equal to the distance between the snap ring temporary fixing groove 92 and the main body recessed portion 94. .

Next, 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 tube 300, first, the flexible tube 300 is inserted into the insertion port 30 of the joint body 20 from the inlet side of the pusher wheel 24. 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 insertion port 30 passes through the sealing material 22 in the order of the obstruction part 64, the sealing action part 62, and the body part 60a. Thereafter, as shown in FIG. 5A, the distal end portion of the flexible tube 300 abuts against the tube end receiving portion 60 b of the sealing material 22. At that time, since the sealing action portion 62 of the sealing material 22 is formed so as to protrude outward, the sealing action portion 62 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 hits 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 back of the third housing portion 48. Along with this pushing, the sealing action part 62 of the sealing material 22 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 third housing part 48. At that time, the sealing action part 62 is in close contact with the slope 312 a of the valley 312. At the same time, the blocking portion 64 moves to the constriction side of the retaining diameter reducing guide portion 56. The blocking portion 64 is pulled into the second housing portion 44 while being pushed in the diameter reducing direction by the retaining diameter reducing guide portion 56. As a result, as shown in FIG. 5B, the seal material 22 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 third housing 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. 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. FIG. 5B shows a situation in which the inner diameter portion of the tube end receiving portion 60 b of the sealing material 22 and the inner surface of the distal end portion of the flexible tube 300 are in contact with the stopper portion 50 at the back of the third accommodating portion 48.

After the insertion of the flexible tube 300 is completed, the malfunction prevention collar 110 is removed from the pusher wheel 24. When the malfunction prevention collar 110 is detached, the pusher wheel 24 is completely pushed in by the pushing allowance (the stroke length S shown in FIG. 5B). Along with this pushing, the snap ring 26 slides out of the snap ring temporary fixing groove 92 along the groove tapered surface 92a in a state where the inner peripheral portion is fitted in the pusher wheel recessed portion 84. Since it moves along the groove taper surface 92a, the snap ring 26 is elastically deformed to reduce its diameter. When the push ring 24 is completely pushed in, the outer periphery of the snap ring 26 is fitted into the main body recess 94. When the outer periphery of the snap ring 26 fits into the main body recess 94, the diameter of the snap ring 26 that has been reduced in diameter until then increases. Thereby, the position of the push wheel 24 can be fixed. FIG. 5C shows a state where the pusher wheel 24 is completely pushed. The front end portion of the push wheel 24 is held at a complete pushing position located on the rear side of the blocking portion 64. At this time, as clearly shown in FIG. 5C, the sealing state by the sealing material 22 is ensured.

Also, as the push wheel 24 is completely pushed, the reaction force portion 82b at the tip of the push wheel 24 comes close to and faces the outer peripheral tapered surface 71 of the blocking portion 64. 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 71 moves slightly in the direction of the insertion port 30 and contacts the reaction force portion 82 b. When the outer peripheral tapered surface 71 comes into contact with the reaction force portion 82b, the outer periphery taper surface 71 receives the reaction force from the reaction force portion 82b. When the outer peripheral tapered surface 71 receives a reaction force from the reaction force portion 82 b, the retaining portion 70 b moves toward the bottom of the valley portion 312 of the flexible tube 300. The outer peripheral tapered surface 71 receives a reaction force from the reaction force portion 82b, and the retaining portion 70b transmits the reaction force to the flexible tube 300, so that the flexible tube 300 is prevented from coming off.

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 with reference to FIG.

When the flexible pipe 300 is inserted into the joint body 20, the flexible pipe 300 passes through the sealing material 22 in the order of the obstruction part 64, the sealing action part 62, and the trunk part 60a. Then, as shown to Fig.6 (a), the front-end | tip part of the flexible pipe | tube 300 strikes against the pipe end receiving part 60b of the sealing material 22. FIG.

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 body portion 60 a of the sealing material 22 is pushed into the third accommodating portion 48. Along with this pushing, the sealing action part 62 of the sealing material 22 moves to the narrow side of the sealing material diameter-reducing guide part 46. At the same time, the blocking portion 64 moves to the constriction side of the retaining diameter reducing guide portion 56. However, since the coating layer 314 of the flexible tube 300 abuts against the abutting portion 88 of the push ring 24, a part of the disturbing portion 64 is not drawn into the second accommodating portion 44 as shown in FIG.

When the coating layer 314 hits the abutting portion 88, the malfunction prevention collar 110 is removed from the press wheel 24. When the malfunction prevention collar 110 is removed, the push ring 24 is pushed into the joint body 20. With this pushing, the tip end portion 82 a of the pusher wheel 24 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 portion 56. By pressing the restraining portion 70a against the retaining diameter reducing guide portion 56, the pusher wheel 24 receives a reaction force from the restraining portion 70a. Since the reaction force is received, the pusher wheel 24 cannot be advanced to the back of the joint body 20 as shown in FIG.

In addition, when the pusher wheel 24 is pushed in without inserting the flexible tube 300 into the joint body 20, the intervention unit 70 stands in front of the pusher wheel 24. The tip end portion 82 a of the push ring 24 fits into the meshing recess 70 c of the intervention portion 70. By fitting the distal end portion 82 a into the engaging recess 70 c, the restraining portion 70 a of the intervention portion 70 is pressed against the inner peripheral surface of the first housing portion 42. The inner peripheral surface of the first housing part 42 receives the restraining part 70 a of the intervention part 70. Thereby, although the flexible pipe 300 is not inserted in the joint main body 20, the situation where the push ring 24 is pushed into the joint main body 20 is avoided.

As described above, in the flexible pipe joint 10 according to the present embodiment, the tip of the coating layer 314 is abutted against the abutting portion 88. It is the distal end portion of the flexible tube 300 that pushes the body portion 60 a into the third housing portion 48. Accordingly, if the exposed portion of the flexible tube 300 is short, the body portion 60a cannot be pushed into the back of the third housing portion 48. Since it becomes impossible to push in the trunk | drum 60a, the situation where the outer periphery of the flexible tube 300 becomes unsealed due to the lack of the length of the exposed part of the flexible tube 300 is avoided.

The embodiment disclosed this time is 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 male threaded flexible pipe joint in which the insertion port 30 is formed at one end of the joint body 20 and the connection male thread 32 is formed at the outer periphery of the other end of the joint body 20. 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.

In the present invention, if the inner diameter of the trunk portion 60a is equal to or smaller 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 22 is engaged with the flexible tube 300 by the frictional force that acts between the body 60 a and the flexible tube 300. When the sealing material 22 is engaged with the flexible pipe 300, the sealing material 22 is drawn into the second housing portion 44 of the joint body 20.

Further, the sealing material 22 may have a plurality of sealing action portions 62. In this case, it is desirable that the sealing action portions 62 are arranged along the central axis of the sealing material 22. Further, it is preferable that the interval between the sealing action portions 62 is proportional to the interval between the peak portions 310 and the valley portions 312 of the flexible tube 300. These intervals may be smaller than the intervals between the peaks 310 and the valleys 312. This is because the gap between the sealing action portions 62 can be expanded by elastic deformation when meshing with the valley 312 of the flexible tube 300.

Further, the snap ring 26 may be prevented from fitting into the main body recessed portion 94 by a mechanism other than the tip portion 82a pressing the restraining portion 70a against the inner periphery of the first accommodating portion 42. For example, the snap ring 26 may be prevented from fitting into the main body recessed portion 94 by applying a reaction force to the push ring 24 by pressing a part of the blocking portion 64 against the inner peripheral surface of the second housing portion 44. . When the structure of the joint main body 20 is different from that described above, a part of the joint main body 20 other than the first housing portion 42 and the second housing portion 44 may receive the blocking portion 64.

Further, when the first accommodating portion 42 does not have the retaining diameter reducing guide portion 56, the tip portion 82a may not have a surface that narrows as it approaches the tip of the cylindrical portion 76a.

DESCRIPTION OF SYMBOLS 10 Flexible pipe joint 20, 250 Joint main body 22 Sealing

material

24, 254

Push ring

26, 258 Snap ring 30 Insert port 32 Connection male screw 42 First housing portion 44 Second housing portion 46 Sealing material diameter reduction guide portion 48 Third housing portion 50 Stopper portion 54 Grooved portion 56 Stopping diameter reducing guide portion 60a Body portion 60b Pipe end receiving portion 60f Reinforcing metal core 61 Engaging portion 62 Sealing action portion 63 Pipe insertion hole 64 Interference portion 70 Interference portion

70b Restraining portion

70c Engagement recess 71 Peripheral taper surface 76a Cylindrical part 76b Gutter part 77 Insertion planned part 78 Packing groove 79a Covering layer entry part 79b Main body communication part 80 Waterproof packing 82a Tip part 82b Reaction force part 84 Push ring recess 86 Waterproof packing groove 87 Circular opening 88 Abutting portion 92 Snap ring temporary fixing groove 92a Groove taper surface 9 4 Main body recessed portion 96 Fireproof packing groove 100

Selective permeability member

102, 256 Waterproof packing 104 Fireproof packing 106a Inclined surface 106b Tip surface 110 Malfunction prevention collar 252 Retainer member 252a Rear protrusion 260 First groove 262 Second groove 264 Third groove 270 Expansion step portion 280 Decomposition ring member 300 Flexible pipe 310 Mountain portion 312a Slope 312 Valley portion 314 Coating layer

Claims

A joint body having an insertion port;
An elastically deformable sealing material housed in the joint body;
A push ring inserted into the joint body through the insertion port,
A flexible tube passing through the push ring is inserted into the joint body from the insertion port,
On the outer periphery of the flexible tube, crests and troughs extending in the entire circumference are arranged alternately in the tube axis direction,
A coating layer is provided on the outer periphery of the flexible tube,
The tip of the flexible tube is exposed;
In the sealing material, a tube insertion hole is formed in the center,
The flexible tube is inserted into the tube insertion hole,
The sealing material is a joint for a flexible pipe that seals between an outer peripheral surface of the flexible pipe and an inner peripheral surface of the joint body in the joint body,
The press ring is
A coating layer entry portion through which the tip of the flexible tube passes and the coating layer enters;
A main body communicating portion disposed on the joint main body side of the covering layer entering portion when the push ring is inserted into the joint main body,
A circular opening having a diameter that is smaller than the outer diameter of the covering layer and larger than the outer diameter of the peak portion of the flexible pipe passes through the flexible pipe at a boundary portion with the covering layer entering portion of the main body communication portion. A joint for flexible pipes, characterized in that it is provided.
The flexible pipe joint according to claim 1, wherein the main body communication portion is disposed at a boundary portion with the coating layer entering portion, and has a butting portion with which a tip of the coating layer abuts.