JP4736490B2 - Plug-in fittings - Google Patents

Description

  The present invention relates to an insertion-type pipe joint for connecting a flexible tube used for gas piping or the like with one touch.

  Conventionally, the joint of FIG. 11 disclosed by patent document 1 is known as a pipe joint which connects the flexible pipe | tube which flows fluids, such as gas. The pipe joint is disposed on the inner side of the cylindrical main body 152 having the sealant accommodating portion 150 therein, a push ring 154 whose tip is screwed into the cylindrical main body 152, and the push ring 154 inside the cylindrical main body 152. The retainer 156 and an annular seal member 158 disposed in the sealant accommodating portion 150 of the cylindrical main body 152 on the back side of the retainer 156 are provided. The flexible tube 160 connected to the joint is composed of a thin stainless corrugate tube 162 and a synthetic resin tube-shaped covering 164 covering the outer periphery of the corrugate tube. In a state where the cover 164 is removed, it is inserted from the end of the pusher wheel 154 toward the inside of the pusher wheel 154, the retainer 156, the annular seal member 158, and the cylindrical main body 152. Then, the peak portion 166 of the corrugate tube pushes the protrusion 168 of the retainer 156, passes through the protrusion 168, and is press-fitted into the inner periphery of the annular seal member 158, thereby completing the joining. At this time, the distal end portion of the corrugate tube 162 is provided at a portion on the inner peripheral side with respect to the sealing material, and protrudes from the inner end of the cylindrical main body 152 toward the opening side of the press ring 154, and is a thin ring-shaped annular projection. It is inserted into the gap between the portion 170 and the annular seal member 158. At this time, the protrusion 168 of the retainer 156 is reduced in diameter by the action of the ring spring 172 and is engaged with the valley 174 of the corrugate tube. When the pulling-out force from the joint is applied to the flexible tube 160, the outer peripheral taper surface 176 of the retainer 156 engaged with the valley 174 of the corrugate tube comes into contact with the inner peripheral taper surface 178 of the push ring 154, and the retainer 156 In order to receive a radially inward force, the protrusion 168 of the retainer 156 presses the outer periphery of the valley portion 174 of the corrugate tube, and prevents the flexible tube 160 from coming out of the joint.

Japanese Patent No. 3288343

  The above-described conventional plug-in pipe joint of Patent Document 1 inserts a corrugate pipe 162 into the inner peripheral portion of the annular seal member 158 in the joint, thereby sealing the joint and the corrugate pipe. However, it is difficult to integrally form the thin ring-shaped annular protrusion 170 on the back end side of the cylindrical main body 152, and there is a problem that the manufacturing efficiency is inferior and the manufacturing cost is high. In addition, in order to improve the sealing performance when inserting a corrugate tube having a wave-like shape with continuous ridges and valleys and having dimensional tolerances, the insertion resistance of the corrugate tube is increased by reducing the inner peripheral diameter of the annular seal member. Therefore, a large force is required when the operator inserts. On the other hand, if the inner diameter of the annular seal member is increased in order to reduce the insertion resistance, the sealing performance deteriorates. Therefore, high accuracy is required for the formation of the annular protrusion 170 and the annular seal member 158, and the setting and adjustment of dimensions. This was a further factor in the decline and high manufacturing costs. In addition, it is not easy to correctly insert the tip of the corrugate tube into the narrow gap between the sealing material and the annular protrusion, and it takes a long time to work and there is a risk that the operation will end with an inappropriate insertion. Furthermore, when the flexible tube is inserted into the pipe joint, the peak portion of the corrugate pipe pushes the protrusion of the retainer, passes through this protrusion, is press-fitted into the inner periphery of the annular seal member, and is inserted for joining. There was a great resistance, and the insertion work was difficult and time consuming. Moreover, in order to hold the retainer in a reduced diameter state, parts such as a ring spring used as an integral part of the retainer are necessary, which increases the number of parts, which is a disadvantage in assembly work and parts management. . Furthermore, in the conventional structure, in order to confirm that the corrugate pipe has been inserted at an appropriate position, it is necessary to mark the insertion position of the corgate pipe in advance, which increases the assembly work process and takes time. It was.

  The present invention has been made in view of the above-described conventional problems. One object of the present invention is to insert a corrugate pipe into a pipe joint with a light force and connect it in a correct fitting state in a short time. An object of the present invention is to provide a plug-in type pipe joint capable of ensuring performance. Another object of the present invention is to provide a plug-in type pipe joint that is easy to manufacture and low in cost, and that connects a corrugate pipe and a pipe joint by an easy connection operation. In addition, another object of the present invention is to perform connection work with a small number of parts without specially performing preparations for marking or other plug-in connection prior to plug-in connection work of a corrugate pipe to a pipe joint. An object of the present invention is to provide a plug-in pipe joint capable of

In order to achieve the above object, the present invention provides a plug main body 12 having an inner wall surface formed in a stepped shape in a plug-in pipe joint for connecting a flexible tube 1 formed by a corrugate pipe 4, and a tip. A press ring 14 having a portion screwed into the joint body 12 and having an insertion opening for the corrugate pipe 4 on the other end, and an inner diameter of the corrugate pipe so as to pass through the corgate pipe without being in contact with the corgate pipe. 4, a retainer 38 formed larger than the maximum diameter of 4, a seal member 42 disposed inside the pusher wheel 14 on the back side of the retainer 38, and a back end direction movement provided in the joint body 12 on the back side of the seal member 42. a locked ring so as not to, partially in contact with the tip of Korugeito tube when Korugeito pipe 4 is inserted is elastically scaled Shinano radially of Korugeito tube 4 While gripping the leading end portion of the Korugeito tube 4 has a ring 32 having an end portion of the sealing member 42 and another portion in contact with the retainer 38, the mountain portion of 2 M the tip by inserting the Korugeito tube 4 A base end portion 382 that is directly pressed by the sealing material 42 and is in close contact with the receiving wall 46 provided on the inner diameter side of the pusher wheel 14 when a force in the pulling direction is applied while being held by the ring 32; When a force in the pulling direction is applied in a state where the thin wall portion 384 formed in the circumferential direction at the end portion 382 and the corrugate tube 4 are inserted and the peak portion 2M of the tip portion 382 is gripped by the ring, the sealing material 42 is applied. Alternatively, the slant is engaged with the valley portion 3 of the corgate tube 4 by reducing the inner diameter so that the distal end side is rotated about the base end portion 382 by being pressed against the plate 40 provided along with the sealing material. the inward protrusion 381, only including, In connecting the flexible tube 1 to the joint main body 12, when the corrugate tube 4 is inserted and connected through the insertion opening of the pusher wheel 14, at least the retainer 38 passes through the inner peripheral side in a non-contact state, and the inner surface of the sealing material 42. The tip crest 2M of the corgate pipe 4 is gripped by the ring 32 on the back side through the plug-in type pipe joint. With such a configuration, it is possible to prevent the tube from coming out by securely engaging the retainer with the outer surface of the corrugate tube by a slight pulling operation after the corrugate tube is inserted when the joint body and the flexible tube are connected. Since the insertion of the corrugate pipe 4 into the pipe joint is only subjected to the press-fitting resistance of the seal packing without contacting the retainer, the inner circumference of the seal packing can be passed with a light force. At this time, the seal packing may be formed of a material containing a lubricant, which enables a smoother insertion.

  Further, the ring 32 has a ring base 320 having an inner diameter larger than the maximum diameter of the corrugate tube 4, and protrudes in the inner diameter direction from the ring base 320 and elastically expands / contracts in the radial direction of the corgate tube 4 when the corgate tube 4 is inserted. However, the first inner peripheral protrusion 321 for inserting the peak portion 2 of the corrugate tube into the inner side and the first inner peripheral protrusion 321 protruding in the inner diameter direction from the ring base 320 are alternately arranged, and the first A second inner peripheral protrusion 322 is disposed at a different length and angle from the inner peripheral protrusion 321 and has a protrusion 322A at its tip to restrict the entry of the corgate pipe 4 and prevent the corgate pipe 4 from swinging. And an outer peripheral protrusion 323 that is provided on the outer periphery of the ring base 320 and elastically expands in the circumferential direction to engage with the joint body 12. When a force acts in the pulling direction in a state where the tip of the corrugate tube 4 is not gripped by the ring 32 in the joint body 12, that is, the corrugate tube 4 is not inserted to an appropriate position, the corgate tube 4 Therefore, the joint between the pipe joint and the corrugate pipe 4 in an incomplete state is reliably prevented.

The retainer 38 has a facing surface 385A facing the receiving wall 46. The facing surface 385A is a thin-walled portion when a force is applied in the pulling direction with the ring 32 held at the tip of the corrugate tube 4. The base end portion 382 having 384 may be set as an inclined surface directed in the insertion direction so as to first contact the receiving wall 46. When the corrugate pipe 4 is inserted into the pipe joint 10, the corgate pipe 4 passes through the ring-shaped retainer 38 and the seal packing 42, and the tip of the corgate pipe 4 abuts on the ring 32 to expand and contract a part of the ring 32. While being gripped in the ring 32. In this state, when a force is applied to the corrugate tube 4 in the pulling direction, the ring 32 and the seal packing 42 move together in the pulling direction, and a force in the pulling direction is transmitted to the retainer 38, and the force in the pulling direction causes the retainer 38 to move. The inner diameter portion is reduced in diameter so that the inner diameter side rotates about the base end portion as a fulcrum. By this action, the retainer 38 can be rotated and deformed in the direction of diameter reduction with a small resistance and a short movement distance, and can be engaged with the corrugate tube 4. At this time, the seal packing 42 is compressed by the ring 32 and the retainer 38 to improve the sealing effect.

  According to the plug-in type pipe joint of the present invention, in the plug-in type pipe joint for connecting a flexible tube formed of a corrugated pipe, a joint main body having an inner wall surface formed in a stepped shape, and a tip part of the joint main body A press ring that is screwed into the interior of the press ring, a retainer that is disposed inside the press ring and has an inner diameter larger than the maximum diameter of the corrugate tube, a seal material that is disposed inside the press ring on the back side of the retainer, and a joint on the back side of the seal material When the corrugate tube is inserted inside the main body, it contacts the tip of the corgate tube and a part of the corgate tube is elastically expanded and contracted in the radial direction while gripping the tip of the corgate tube, and a sealing material When a force in the pulling direction is applied with the ring having the other part in contact with the end of the ring and the inside of the press ring, with the corrugate tube inserted and the crest of the tip held by the ring And a receiving wall that is disposed on the back side of the retainer and receives the retainer, and a receiving wall provided in a direction substantially perpendicular to the joint shaft. The retainer is inserted into the corrugate tube and is gripped by the ring at the tip. When a force in the pulling direction is applied in this state, a base end portion that is directly pressed by a sealing material or a plate attached to the sealing material and is in close contact with the receiving wall side, and a circumferential direction is formed at the base end portion. When a force in the pull-out direction is applied with the thin-walled portion and the corrugate tube inserted and the crest at the tip of the thin-walled portion being gripped by the ring, it is pressed directly against the sealing material or the plate attached to the sealing material. And a slanted inward projection that fits into the valley of the corrugate tube by reducing the inner diameter so that the distal end is rotated about the base end, thereby reducing the force of the corgate tube Insert it into the fitting with a short and correct Can connect engaged state, it is possible to ensure a reliable sealing performance. In particular, the base end of the slanted inward projection is received by the receiving wall of the press ring provided in a direction substantially perpendicular to the joint shaft parallel to the insertion direction, and in this state, it is further pushed directly by the pulling force to reduce the inner diameter of the retainer. Since the diameter is operated, the retainer is securely engaged with the valley of the corrugate tube, the smooth rotation with the base end as a fulcrum, and the insertion path outline shape to reduce the insertion resistance when inserting the corgate tube Ensuring sufficient clearance at the set position before operation on the inner diameter side of the retainer can be realized at the same time to compensate for a simple and quick fitting connection and secure sealing function. In addition, it is easy to manufacture and low cost, and the corrugate pipe and the pipe joint can be connected by an easy connection operation. Further, prior to the plug connection work of the corrugate pipe to the pipe joint, the connection work can be performed with a small number of parts without specially preparing for the marking of the corrugate pipe and other preparations for the plug connection.

  In addition, the retainer has an inclined inner wall that is inclined in the direction of insertion of the corrugate tube on the inner side thereof, so that the inner diameter side of the retainer does not hit against insertion resistance when the corgate tube is inserted. When the corrugate tube is pulled and the retainer is pushed through the seal packing, etc., the diameter of the retainer is reduced and turned toward the center of the retainer. Can be performed smoothly.

  The retainer has a facing surface facing the receiving wall, and the facing surface has a base end portion having a thin wall portion when a force is applied in the pulling direction with the ring held at the tip of the corrugate tube. First, the corrugate tube is pulled to hit the inner diameter side of the retainer, and then obliquely inwardly projecting from the base end. Since the tip end side of the retainer rotates and the opposing surface comes into close contact with the receiving wall, the diameter reducing operation on the inner diameter side of the retainer can be performed smoothly and stably.

  In addition, the ring has a ring base whose inner diameter is larger than the maximum diameter of the corrugate tube, and protrudes from the ring base in the inner diameter direction and elastically expands and contracts in the radial direction of the corgate tube when the corgate pipe is inserted. A first inner circumferential protrusion that inserts the portion into the inner side, a length and an angle that are alternated with the first inner circumferential protrusion that protrudes in the inner diameter direction from the ring base, and are different from the first inner circumferential protrusion A second inner peripheral protrusion having a protrusion for restricting the entry of the corrugate pipe to prevent the corrugate pipe from swinging, and being provided on the outer periphery of the ring base and elastically in the circumferential direction. Since it has an outer peripheral protrusion for expanding the diameter and engaging with the joint body, when the corrugate pipe is inserted, the leading peak is securely gripped and linked to the connection completion process by the next pulling operation. Can be made.

  Further, by arranging a plate for preventing the sealing material from being caught by the retainer due to rotational deformation between the retainer and the sealing material, the diameter reducing operation of the retainer can be reliably performed.

As described above, according to the plug-in type fitting of the present invention, no other work is required other than the work of inserting the flexible tube into the plug-in type pipe fitting and pulling it for confirmation of joining. These corrugate pipes and joints can be reliably sealed and joined together. Further, the corrugate tube and the retainer do not come into contact with each other and can be inserted with a light force. In addition, the base end of the retainer is first brought into contact with a receiving wall that is substantially perpendicular to the joint shaft of the pusher wheel, and the inner diameter side of the retainer is further pushed to gradually rotate the base end about the fulcrum, thereby Since it is engaged with the portion, the corrugate tube and the retainer can be engaged with each other with a short pull, and as a result of being strongly engaged with the valley portion of the corgate tube, it is possible to reliably prevent the flexible tube from coming out of the joint. In particular, a configuration in which the pressing ring from the joint body can not come out in a threaded fashion, insertion of Korugeito tube, by a series of substantially one-touch close operation of the pull, through axial rotation shaped diameter-decreasing operation of the rotational position portion content of the retainer diameter By moving the slanting inward projection in the direction, it is possible to secure a sufficient distance between the maximum diameter of the corrugate tube and the inner diameter side of the retainer. Can be inserted easily and smoothly. In addition, since the corrugate tube is engaged with the ring in the joint body and the joint and flexible tube are joined by the pulling operation, if the flexible tube is pulled out without inserting it to the appropriate position, the flexible tube will be completely As a result of pulling out from the joint, it is possible to easily confirm the joining by the pulling-out operation itself for joining.

It is a semi-cylindrical cross-section explanatory drawing which shows the state which inserted the flexible tube in the plug-in type pipe joint which concerns on embodiment of this invention. FIG. 2 is an enlarged view of a portion surrounded by a broken line in FIG. 1. FIG. 2 is a half cross sectional explanatory view of the plug-in type pipe joint of FIG. 1. It is an enlarged front view of the ring of the plug-in type pipe joint of FIG. It is an AA arrow directional view of FIG. It is an enlarged front view of the retainer of the plug-in type pipe joint of FIG. It is a BB line arrow line view of FIG. It is explanatory drawing of the state of the intermediate | middle stage which applied the force of the extraction direction to the flexible tube (corrugate pipe | tube) from the state of FIG. 1, and engaged the outer peripheral protrusion with the 2nd ring holding | grip accommodating part. FIG. 6 is a half-sectional explanatory view showing a state where the joining of the flexible tube and the pipe joint is completed. FIG. 3 is an operation explanatory view showing an engagement relationship among a push ring, a retainer, and a corrugate pipe of the joint of FIG. 1. FIG. 3 is an operation explanatory view showing an engagement relationship among a push ring, a retainer, and a corrugate pipe of the joint of FIG. 1. FIG. 3 is an operation explanatory view showing an engagement relationship among a push ring, a retainer, and a corrugate pipe of the joint of FIG. 1. It is a half-river cross-sectional explanatory drawing which shows the structure of the conventional pipe joint.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a plug-in type pipe joint and a flexible tube according to an embodiment of the present invention. The flexible tube 1 includes a corrugate tube 4 composed of thin stainless steel peaks 2 and valleys 3, and a synthetic resin tube-shaped covering 5 covering the outer periphery of the corrugate tube 4. The corrugate pipe 4 is connected to the plug-in pipe joint 10 in a state where the covering 5 has been removed from the tip of the corrugate pipe 4.

  The pipe joint 10 includes a joint body 12 and a push ring 14 whose tip is screwed into the inner diameter side of the joint body 12. The joint body 12 is a hollow short cylindrical tube formed in a stepped shape, is formed of a metal such as brass, and an outer screw for connecting to a connected body such as a gas pipe at the outer periphery of one end thereof. A portion 16 and a hexagonal portion 18 for screwing the external screw portion 16 are provided. From the other end side of the joint body 12 to the inner peripheral portion thereof, from the opening side, the outer packing accommodating portion 20, the inner thread portion 22, the seal accommodating portion 23, the ring grip accommodating portion 24 (24A, 24B), the ring accommodating portion 26, A support ring accommodating portion 28 is also provided. A support ring 30 is disposed in a press-fit state in the support ring housing portion 28 in the joint body 12. The support ring 30 is made of a metal such as brass, and prevents a ring 32 described later from entering the joint body 12.

  The press ring 14 is formed of a metal such as brass, and has an outer thread portion 34 and an outer packing groove portion 36 that can be screwed into the inner thread portion 22 on the inner diameter side of the joint body 12 at one end thereof. Further, the inner periphery includes an inner periphery accommodating portion 44 that accommodates the retainer 38 and the plate 40, a receiving wall 46 that can contact the retainer 38, and a fireproof packing accommodating groove 48. The receiving wall 46 is disposed on the back side of the retainer 38 and receives the retainer when a force in the pulling direction is applied while the corrugate tube 4 is inserted and the peak portion 2 of the corrugate tube 4 is gripped by the ring 32. The inner stepped wall of the push wheel is provided in a direction substantially perpendicular to the joint shaft 70 that is the central axis of the joint body 12 in this embodiment. Further, a two-sided flat 50 with which a dedicated tool for screwing into the joint main body 12 is engaged is provided on the outer periphery of the other end, and a gas leak detection hole 52 is provided in the two-sided flat 50. In addition, a dust seal housing recess 54 is formed on the inner periphery of the push wheel 14 on the other end side. The two flat surfaces 50 have dimensions that a general tool cannot engage with, and have a structure that prevents the joint body 12 and the push ring 14 from being accidentally removed. A dust seal 56 made of a circular ring-shaped elastic body is mounted along the circumferential direction of the dust seal housing recess 54 on the inner peripheral surface of the push ring 14, and the inner protrusion 58 of the dust seal 56 extends around the outer periphery of the corrugate tube 4. It can be tightly sealed with the covering synthetic resin tube-like covering 5 to prevent entry from the outside.

  A fireproof packing 60 is mounted in the fireproof packing housing groove 48 on the inner peripheral surface of the push ring 14. The fireproof packing 60 is made of an elastic body formed by integrally molding, for example, expanded graphite and a rubber material such as NBR (nitrile rubber), and the volume of the fireproof packing 60 expands when exposed to a high temperature such as a fire. , Seal the inside.

  The gas leak detection hole 52 is a through hole for detecting gas leak due to corrugate tube damage. A plug 62 is disposed in the gas leak detection hole 52. When the plug 62 is pushed to a certain position, gas can be discharged and gas leak detection can be performed. After confirming that there is no gas leak, the plug 62 is pushed into the gas leak detection hole 52. It is designed to prevent intruders from outside.

  As shown in FIG. 1, in a state where the pusher wheel 14 is screwed into the joint main body 12, the retainer 38 and the plate 40 are arranged in this order from the pusher wheel 14 toward the joint main body 12 in the inner peripheral housing portion 44 in the pusher wheel 14. Yes. The plate 40 has a boundary portion between the tip of the press ring with the press ring 14 screwed into the joint main body 12 and a stepped wall that is reduced in a stepped shape from the internal thread portion 22 of the joint main body and continues to the seal housing portion 23. The rear surface is in contact with the other end of the seal packing 42. Further, the surface on the push ring opening side hits the retainer 38 when a force is applied to the corrugate tube in the pulling direction. A seal packing 42 is disposed on the back side of the plate 40, that is, the seal housing portion 23 in the joint body 12, and a ring 32 and a support ring 30 are disposed on the joint body 12 on the back side of the seal packing 42. Yes. The outer packing 100 is disposed in the outer packing groove 36 of the push ring 14 and the portion of the outer packing accommodating portion 20 in the joint body 12. The outer packing 100 is formed of the same material as the fireproof packing and is compressed by the push ring 14 and the joint main body 12 to prevent leakage from the inside and prevent entry of an intrusion from the outside.

The retainer 38 is made of a metal such as brass, and is formed on the inner periphery of one end as shown in FIGS. 1, 3, 6, and 7 and is pushed by a pulling force with respect to the seal packing to engage with the corrugate tube valley 3. An inward projecting portion 381, a proximal end ring portion 382 formed on the outer peripheral portion of the other end of the retainer and contacting the receiving wall 46 of the pusher wheel 14 when the retainer is pushed to the pusher wheel opening side, and along the circumferential direction It has a notch 383 formed in a plurality of positions and extending in the axial direction from one end side to the other end side, and a thin portion 384 for deformation formed on the other end side, and its inner diameter is that of the corgate pipe 4 It is formed larger than the maximum diameter. In the embodiment, the retainer 38 is a deformed ring having a deformed isosceles triangle section having only one opposing side bent into a square shape, and two leg portions having a triangular cross section are provided at both ends of the square shape. Forming. One leg portion forms an oblique inward projection portion 381 and the other leg portion forms an opposing projection portion 385 that connects to the proximal ring portion 382. The cut 383 is cut from the oblique inward projection 381 toward the proximal ring portion 382, and is terminated at the thin portion 384 leaving a small connection portion. The proximal ring portion 382 is a proximal end portion that is connected in a ring shape including the thin portion 384, and when the retainer is pushed by the seal packing, the distal end of the oblique inward protruding portion 381 centering on the proximal ring portion 382. It becomes the axis which rotates the side. That is, the base end ring portion 382 is a plate that is attached to the sealing material 42 when a force in the pulling direction is applied in a state where the corrugate tube 4 is inserted and the peak portion 2 of the corrugate tube 4 is gripped by the ring 32 ( Alternatively, it is pressed directly by the sealing material) and closely contacts the receiving wall 46 side. As will be described later, when the flexible tube 1, that is, the corrugate tube 4 is pulled toward the opening side of the pusher wheel 14, the proximal end ring part 382 of the retainer 38 contacts the receiving wall 46 of the pusher wheel 14 and the oblique inward protrusion 381. When a force for pressing toward the opening side in the longitudinal axis direction of the corrugate tube is applied, the distal end side of the oblique inward projection 381 is rotationally deformed in the diameter-reducing direction with the proximal ring portion 382 as the center of rotation R as shown in FIG. At that time, the tip portion is rotated so as to be engaged toward the valley portion 3 of the corrugate tube 4.

The opposing protrusion 385 that is one of the leg portions contacts the receiving wall 46 when the diameter of the rotation centering on the proximal ring portion of the oblique inward protrusion 381 is reduced. The facing protrusion 385 has a facing surface 385A that faces the receiving wall 46. The facing surface 385A is oriented in the insertion direction so that the base end portion having the thin portion 384 first hits the receiving wall 46 when a force is applied in the pulling direction with the ring held at the tip of the corrugate tube 4. It is set as an inclined surface. Further, the distal end side of the oblique inward protruding portion 381 then rotates around the base end portion, and the facing surface 385A is in close contact with the receiving wall 46. Such a diameter reduction operation on the inner diameter side of the retainer is smoothly and stably performed.

  The retainer 38 has an inclined inner wall that is inclined downward toward the insertion direction of the corrugate tube. In the present embodiment, the inclined inner wall includes an inward protruding portion inclined inner wall 381A and an opposing protruding portion inclined inner wall. In other words, in the present embodiment, the facing surface 385A of the facing protrusion 385 is the second inclined inner wall. As a result, the lower end side of both legs is obliquely raised so that the inner diameter side of the retainer 38 does not hit against insertion resistance when the corgate pipe 4 is inserted, and the corgate pipe is pulled through the seal packing or the like. When the retainer is pushed, it can come into contact with the inclined end of the retainer and smoothly rotate the diameter toward the center of the retainer.

  The plate 40 is formed of a metal such as a thin stainless plate, and prevents the seal packing 42 from being caught in the notch 383 when the retainer 38 is deformed.

The seal packing (seal material) 42 is a sealing means for hermetically sealing the inside and outside of the pipe joint. In this embodiment, for example, NBR (nitrile rubber) containing a lubricant is used to reduce resistance when the corrugate pipe is inserted. In order to ensure stable sealing performance, the inner diameter of the seal packing 42 is smaller than that of the corrugate tube. Moreover, in this embodiment, since the seal packing 42 is formed of a material containing a lubricant, the corgate tube 4 can be inserted more smoothly.

  1 to 5, the ring 32 is formed of a metal such as thin spring steel, and is disposed in the ring accommodating portion 26 in the joint body 12. When the corgate pipe 4 is inserted and pulled in the pulling direction, the corrugate is formed. While holding the tip crest portion of the tube 4, the tube 4 is moved to the ring gripping accommodating portion 24A and further to 24B. The ring 32 is provided inside the joint body 12 on the back side of the seal material, and abuts against the tip of the corgate pipe when the corgate pipe 4 is inserted from the opening side of the pusher wheel 14, and is elastic in the radial direction of the corgate pipe. And a part that grips the tip of the corrugate tube while expanding and contracting, and another part that abuts against the end of the sealing material 42. The ring 32 includes a first inner peripheral protrusion 321, a second inner peripheral protrusion 322, and an outer peripheral protrusion 323 that are integrally connected to the annular ring base 320, and the first inner peripheral protrusion 321. The second inner peripheral protrusion 322 engages with the peak portion 2 at the tip of the corrugate tube, and the outer peripheral protrusion 323 moves to a predetermined position and engages with the ring grip accommodating part 24 in the joint body 12. The second inner peripheral protrusion 322 is formed with a protrusion 322 </ b> A whose tip is directed toward the radial center, and therefore, the peak 2 at the tip of the corrugate tube 4 passes through the second inner peripheral protrusion 322. I can't do that.

  In the present embodiment, as shown in FIGS. 1 to 3 and FIGS. 8 and 9, the ring grip accommodating portion 24 is composed of first and second ring grip accommodating portions 24A and 24B. The first ring gripping / accommodating part 24A is arranged on the opening side of the joint body 12 with a small step from the ring accommodating part 26, and the second ring gripping / accommodating part 24B is slightly further from the first ring gripping part. The diameter of the joint body 12 is increased and the joint body 12 is further disposed on the opening side. The second ring gripping / accommodating portion 24 </ b> B is formed to have a diameter that is larger than the seal accommodating portion 23 by a slight level difference. When the corrugate tube is once inserted into the innermost part and then pulled out a little, the outer peripheral projection 323 of the ring 32 is fitted into the second ring grip accommodating portion 24B via the first ring grip portion. At this time, the tip of the oblique inward protrusion 381 of the retainer 38 is engaged with the valley 3 of the corrugate tube 4 to prevent the corrugate tube from being pulled out. When the outer peripheral protrusion 323 of the ring 32 is engaged with the second ring gripping and accommodating part 24B, the lock 32 is locked, and the corrugate pipe 4 is prevented from being pulled out. Even when a force in the direction to be applied is applied, the corrugate pipe does not move in the sliding direction with respect to the joint body 12 due to a large movement, and damage to the corgate pipe can be prevented in advance.

Next, the effect | action of the plug-in type pipe joint of this embodiment is demonstrated. When joining the flexible tube 1 to the pipe joint 10, as shown in FIG. 3, the support ring 30, the ring 32, and the seal packing 42 are mounted in the joint main body 12, and the plate 40, the retainer 38, fireproof A flexible tube in which the trough 3 of the corrugate tube 4 is cut from the state in which the packing 60 and the dust seal 56 are attached, and the covering 5 is removed from several peaks at the tip of the corgate tube 4 as shown in FIG. 1 is inserted from the end of the pusher wheel 14 toward the joint body. At this time, the tip of the corrugate tube 4 passes through the inner periphery of the fireproof packing 60 and the retainer 38 in a non-contact state, while passing through the inner periphery of the seal packing 42 while being press-fitted. When the ridge 2M at the tip of the corrugate tube 4 reaches the ring 32, it passes through the first inner peripheral protrusion 321 while elastically expanding and contracting while contacting the first inner peripheral protrusion 321. By passing through the first inner peripheral protrusion 321, the peak 2 M at the tip of the corrugate tube 4 is gripped by the first inner peripheral protrusion 321 and the second inner peripheral protrusion 322 (see FIG. 2). For projection 322A of the distal end portion of the second inner peripheral projection 322, crests of 2 M tip of Korugeito tube 4 can not pass through the second inner peripheral projection 322.

Next, when the flexible tube 1 is pulled out in the pulling direction in order to completely join the corgate pipe 4 and the pipe joint, the ring 32 holding the peak 2M at the tip of the corgate pipe 4 is adjacent to the seal packing 42. When the plate 40 is moved in the pulling direction and pulled to a predetermined position, the outer peripheral projection 323 of the ring 32 expands in the circumferential direction and engages with the ring grip accommodating portion 24A in the joint body 12. At this time, the operator feels the feeling when the outer peripheral protrusion 323 of the ring passes through the stepped wall, and when the force is further applied in the pulling direction, the distal end of the outer peripheral protrusion 323 is inserted into the second ring grip accommodating part 24B, Engaging with the joint body 12 prevents the ring 32 and the flexible tube 1 from moving in the reverse direction. As a result, it is possible to prevent the corrugate pipe from being damaged by sliding excessively in the joint body, regardless of whether a pulling force or a pushing force is applied to the corgate pipe. As the ring 32 moves in the pulling direction, a force in the pulling direction acts on the retainer 38 via the seal packing 42 and the plate 40. At this time, the plate 40 hits the distal end portion of the oblique inward projection 381 provided to be inclined downward in the insertion direction, and rotates the distal end portion with the proximal end portion 382 as a fulcrum R while pushing in the opening direction. Reduce the inner diameter. At this time, on the back side of the retainer, the base end ring portion 382 of the retainer 38 hits the receiving wall 46 of the pusher wheel 14, and the base portion R of the base end ring portion 382 including the thin-walled portion 384 is used as a fulcrum. The protrusion 381 is largely rotated and deformed in the direction of diameter reduction, so that the outer periphery of the valley 3 of the corrugate tube 4 and the protrusion 381 of the retainer 38 are reliably engaged. Since the engagement between the protrusion 381 and the corrugate tube trough 3 is surely obtained by the rotational deformation of the oblique inward protrusion 381 of the retainer, the peak portion 2 and the inner peripheral side of the retainer 38 when the corrugate tube 4 is inserted. Therefore, the flexible tube 1 may be inserted easily with a light effort, and the retainer 38 may be manufactured with a certain degree of accuracy. In addition, the adhesion of the seal packing 42 to the inner peripheral side can be easily adjusted. The seal packing 42 positioned between the ring 32 and the retainer 38 is compressed by the ring 32 and the retainer 38 and expands in the inner diameter direction, thereby improving the sealing effect. Thus, if the corrugate pipe | tube 4 is inserted completely to the back of the coupling main body 12, it will engage with the retainer 38 by pulling the flexible tube 1 by an operator's hand next, and the state of FIG. The construction work is completed.

In this way, the corrugate pipe is inserted from the end of the press ring toward the inside of the press ring, and after the end of the corrugate pipe is gripped by the ring disposed on the back side of the seal material, the ring and seal are pulled out in the pull-out direction. The material moves in the axial direction, and the retainer pushed through the seal material and the plate is brought into contact with the receiving wall of the pusher wheel so that the inner diameter is reduced so that the retainer rotates around the base end portion, and engages with the corrugate tube. Therefore, after inserting the corrugate tube, the operation of reducing the inner diameter of the retainer by pulling out is reliable and stable, the connection work of the flexible tube with the joint body can be performed with a simple operation, and a reliable connection state can be obtained. This can reliably prevent the flexible tube including the corrugate tube from coming out of the pipe joint. When the corrugate tube is inserted and pulled out with insufficient gripping by the ring, the entire corgate tube is pulled out without moving the sealing material. As a result, since the connection state can be confirmed almost simultaneously when the corrugate pipe is connected to the pipe joint, the connection work can be easily and efficiently performed in a short time. In addition, since the retainer engages with the valley of the corrugate tube by rotating the retainer to prevent the corgate tube from coming out, the corrugate tube passage and sufficient clearance are provided so as not to cause insertion resistance when the corgate tube is inserted. As a result, it is possible to set the shape before the diameter reduction on the inner diameter side of the retainer, so that the operator can be smoothly and quickly performed without being confused about the connection state confirmation when connecting the flexible tube. In addition, the structure is relatively simple and advantageous in terms of cost. When removing the flexible tube 1 from the plug-in type pipe joint, using a tool such as a pipe wrench and removing the push ring 14 from the joint body 12, the plug-in type pipe joint can be disassembled. Can be removed from the plug-in fitting.

  The plug-in type pipe joint of the present invention described above is not limited to the above-described embodiment, and may be arbitrarily modified without departing from the essence of the present invention described in the claims. Good.

  The plug-in type pipe joint of the present invention can be widely applied as a pipe joint for piping of gas, other gases, liquids and the like.

DESCRIPTION OF SYMBOLS 1 Flexible tube 4 Corrugate pipe 10 Plug-in type pipe joint 12 Joint main body 14 Push ring 32 Ring 38 Retainer 40 Plate 42 Seal packing 46 Receiving wall 321 1st internal peripheral protrusion 322 2nd internal peripheral protrusion 323 External protrusion 381 Diagonal inside Directional protrusion 382 Base ring part 383 Notch 384 Thin part 385 Opposing protrusion 385A Opposing surface R

Claims (2)

In a plug-in type pipe joint for connecting a flexible tube formed of a corrugate pipe, a joint main body whose inner wall surface is formed in a stepped shape, and
A push ring whose tip is screwed into the inside of the joint body and has an insertion opening for the corrugate tube on the other end side ;
A retainer that is disposed inside the press ring and has an inner diameter larger than the maximum diameter of the corrugate pipe so as to pass through the corgate pipe without contact with the corgate pipe ;
A sealing material disposed inside the pusher wheel behind the retainer;
A ring provided inside the joint body on the back side of the sealing material and locked so as not to move in the back end direction. When the corgate pipe is inserted , the ring abuts against the tip of the corgate pipe and part of the ring While holding the tip portion of the corrugate tube while elastically expanding and contracting in the radial direction of the tube, and having a ring having another portion that contacts the end portion of the seal material,
The retainer is a receiving wall provided on the inner diameter side of the pusher wheel by being directly pushed by the sealing material when a pulling direction force is applied in a state where the corrugate tube is inserted and the peak portion of the retainer is held by the ring. A proximal end closely contacting with
A thin-walled portion formed in the circumferential direction at the proximal end,
When a corrugate tube is inserted and the crest at the tip is gripped by the ring and a force in the pulling direction is applied, the base end is pressed directly against the sealant or the plate attached to the sealant look including a an oblique inward projection which fits into valleys Korugeito tube by diameter of the inner diameter so as to rotate the tip end side around the,
When connecting the flexible tube to the fitting body, when the corrugate tube is inserted and connected from the insertion opening of the press ring, at least the retainer passes through the inner peripheral side in a non-contact state and passes through the inner surface of the sealing material to the back side. A plug-type pipe joint in which a tip crest of a corrugate pipe is gripped by a ring . The ring has a ring base whose inner diameter is larger than the maximum diameter of the corrugate tube,
A first inner peripheral protrusion that protrudes in an inner diameter direction from the ring base and elastically expands and contracts in the radial direction of the corgate pipe when the corgate pipe is inserted;
It protrudes in the inner diameter direction from the ring base and is arranged alternately with the first inner peripheral protrusion and at a different length and angle from the first inner protrusion, and restricts the entry of the corrugate tube at the tip. A second inner peripheral protrusion having a protrusion for preventing the corrugate tube from swinging;
The plug-in type pipe joint according to claim 1, further comprising an outer peripheral protrusion provided on the outer periphery of the ring base and elastically expanding in the circumferential direction to engage with the joint main body.

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