JP2008039093A - Insert type pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insert type pipe joint capable of connecting a corrugated tube in a correct fitted state in a short time by inserting the corrugate pipe into the pipe joint by a small force in spite of a simplified and inexpensive structure, and ensuring secure sealing performance. <P>SOLUTION: In the insert type pipe joint for connecting a flexible tube formed of a corrugated tube, a connecting mechanism with the flexible tube and a sealing mechanism are incorporated in a joint body in an integrated manner, so that the corrugated tube of the flexible tube can be connected only by being inserted it directly into the joint body. The structure is simplified and reduced in weight, and the number of part items is also reduced. The corrugated tube is inserted, and the tip thereof is held by a ring. When the corrugated tube is pulled out in a pulling-out direction in this state, a retainer contacting with the receiving wall of a push ring through a moving seal material is deformed by rotating the inside diameter thereof in a contracting direction and engaged with a valley of the corrugated tube to regulate the further pull-out of the corrugated tube. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a plug-in fitting for connecting a flexible tube used for gas piping or the like with a simple operation in a short time.

  Conventionally, the joint of FIG. 11 shown 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 in 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 the 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, and one object of the present invention is to realize a significant cost reduction by an extremely simple structure and to insert a corrugate pipe into a pipe joint by a simple operation. Thus, an object of the present invention is to provide a plug-in type pipe joint that can be connected in a correct fitting state in a short time and can ensure a reliable sealing performance. 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 type pipe joint capable of performing the following.

  In order to achieve the above object, the present invention is a plug-in pipe joint for connecting a flexible tube 1 formed by a corrugate pipe 4, a joint body 12 having an inner wall surface formed in a stepped shape, A retainer 22 that is disposed inside the main body and has an inner diameter larger than the maximum diameter of the corrugate tube 4, a seal member 27 that is disposed inside the joint body 12 on the back side of the retainer, and the joint body 12 on the back side of the seal material. When the corrugate tube 4 is inserted inside and abuts against the tip of the corgate tube, a part thereof elastically expands and contracts in the radial direction of the corgate tube while gripping the peak portion 2M of the corgate tube, A ring 29 having another portion that abuts against the end portion of the seal material 27, and a state in which the corrugate tube 4 is inserted and the crest portion 2M at the tip thereof is gripped by the ring 29 inside the joint body 12 And a retaining ring 21 that is disposed on the back side of the retainer 22 to receive the retainer when a force in the pulling direction is applied, and the retainer 22 inserts the corrugate tube 4 into the crest 2M at the tip thereof. A base end portion 282 that is directly pressed by the seal member 27 or the plate 24 provided along with the seal member when a force in the pulling direction is applied while being held by the ring 29, and is in close contact with the retaining ring 21; When the pulling direction force is applied in a state where the thin portion 284 formed in the circumferential direction in the portion 282 and the corrugate tube 4 are inserted and the peak portion 2M of the tip portion 282 is held by the ring 29, the sealing material 27 or Diagonally inwardly fitted into the valley 3 of the corrugate tube by reducing the inner diameter so that the distal end side is rotated around the base end 282 by being pressed directly against the plate 24 attached to the sealing material Projection 281 , Composed of bayonet type pipe joint 10 including. Since the above-mentioned plug-in type pipe joint is a structure in which a coupling mechanism that couples both by only inserting a flexible tube and a seal mechanism can be incorporated into one joint body, The connection work can be completed almost instantaneously just by suddenly inserting and inserting the corrugate tube of the flexible tube into the joint body after mounting the internal parts through the insertion opening. And a joint structure can function by a structure only of a joint main part. Further, with such a configuration, after inserting the corrugate pipe at the time of connecting the joint body and the flexible tube, the retainer can be reliably engaged with the outer surface of the corrugate pipe by a slight pulling operation to prevent the pipe from coming out. . 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 present invention is a plug-in pipe joint for connecting a flexible tube 1 formed by a corrugate pipe 4 and has a connection thread portion 14 for connecting to a connected pipe member at one end opening 122 and an inner wall surface of a stepped portion. A joint body 12 having a second end opening 121 which is terminated so that the dust seal accommodating recess 18 is adjacently disposed, and a retainer disposed inside the joint body 12 and having an inner diameter larger than the maximum diameter of the corrugate pipe 22, a seal member 27 disposed in the joint body 12 on the back side from the retainer 22, and a corrugate tube provided when the corgate tube 4 is inserted inside the joint body 12 on the back side from the seal material 27. Tip mountain 2
A ring 2 having another portion that abuts against the end portion of the seal material 27 while gripping the tip peak portion 2M of the corgate tube while elastically expanding and contracting a part of the corgate tube 4 in the radial direction.
9 and the inside of the joint main body 12, when the corrugate tube 4 is inserted and the peak portion 2M is gripped by the ring 29 and a force in the pulling direction is applied to the rear side of the retainer 22 A retaining ring 21 that is disposed to receive the retainer, and the retainer 22 is subjected to a pulling direction force while the corrugate tube 4 is inserted and the peak portion 2M of the retainer 22 is gripped by the ring 29. In this case, a base end portion 282 that is directly pressed by the seal member 27 or the plate 24 attached to the seal member and is brought into close contact with the retaining ring 21, a thin wall portion 284 formed in the base end portion 282 in the circumferential direction, and a corrugate tube When a force in the pulling direction is applied in a state where the tip 2 is held by the ring 29 and the peak portion 2 is held by the ring 29, the seal member 27 or the plate 24 attached to the seal member is brought into contact with and directly pressed. Base end 2 And a slanted inwardly projecting portion 281 that fits into the trough portion 3 of the corrugate tube so that the tip end side is rotated about the center of the corrugate tube. Is done. In addition to producing the same effect as the invention described in 0006, the above structure further connects the coupling body to the joint body of the type in which the dust seal housing recess is provided in the opening by simply inserting the flexible tube. A configuration in which the mechanism and the seal mechanism can be incorporated can be specifically realized.

At this time, the retainer 38 is preferably provided with inclined walls 286 and 287 that are inclined downward toward the insertion direction of the corrugate tube 4.

The retainer 22 has a facing surface that faces the retaining ring 21, and the facing surface is thin when a force is applied in the pulling direction with the ring 29 held by the tip crest 2M of the corgate tube 4. It is preferable that the base end portion 282 having the portion 284 is set as an inclined wall directed in the insertion direction so as to hit the retaining ring 21 first. When the corrugate pipe 4 is inserted into the pipe joint 10, the corgate pipe 4 passes through the ring-shaped retainer 22 and the seal packing 27, and the tip of the corgate pipe 4 abuts on the ring 29 to expand and contract a part of the ring 29. While being held in the ring 29. In this state, when a force is applied to the corrugate tube 4 in the pulling direction, the ring 29 and the seal packing 27 move together in the pulling direction, and the force in the pulling direction is transmitted to the retainer 22. The inner diameter portion is reduced in diameter so that the inner diameter side rotates about the base end portion as a fulcrum. When the retainer 22 applied to the retaining ring is rotated in a slanted inward direction with the base end portion serving as a fulcrum, the gap between the cuts 283 is gradually reduced, and finally the cut cross section is brought into close contact. Further rotation is restricted and locked. As a result, the further pulling-out operation is restricted, and the stopper function by the retaining ring 21 can be effectively functioned by setting it so as to coincide with the maximum diameter reduction.

  Further, the ring 29 has a ring base 291 having an inner diameter larger than the maximum diameter of the corrugate pipe 4, and protrudes from the ring base 291 in the inner diameter direction while elastically expanding and contracting in the radial direction of the corgate pipe when the corgate pipe is inserted. A first inner peripheral protrusion 292 for inserting the ridge portion 2 of the corrugate tube into the inner side, an inner peripheral protrusion projecting from the ring base 291 and alternating with the first inner peripheral protrusion 292, and the first inner periphery A second inner peripheral protrusion 293 that is disposed at a length and an angle different from the protrusion, and that has a protrusion for restricting the entry of the corgate pipe 4 to prevent the corrugate pipe from swinging, and a ring base 291 It is good to have the outer peripheral protrusion 294 provided in the outer periphery of this for elastically expanding in the circumferential direction and engaging with the joint main body 12. When a force is applied in the pulling direction in a position where the tip of the corrugate tube 4 is not gripped by the ring 29 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.

  Further, positioning support means (36) assembled to the ring and mounted to the joint body in order to position the ring 29 at a position and posture suitable for gripping the tip portion of the corrugate tube 4 inserted in the joint body 12. It is good to provide.

  Further, a plate 24 that prevents the seal material from being caught by the rotational deformation of the retainer 22 may be disposed between the retainer 22 and the seal material 27.

  The dust seal housing recess 18 disposed adjacent to the flexible tube insertion opening 121 of the joint body 12 is provided with a dust seal 60 that hermetically seals the inside and outside of the joint body 12. The dust seal 60 communicates the inside and outside of the joint body 12. An air passage 61 is provided, and the gas leak detection semi-permeable member 50 is preferably fitted and integrated so as to close the air passage.

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 body having an inner wall surface formed in a stepped shape, and disposed inside the joint body A retainer having an inner diameter larger than the maximum diameter of the corrugate pipe, a seal material disposed inside the joint body on the back side of the retainer, and a corrugate pipe inserted inside the joint body on the back side of the seal material. The top of the corrugate tube and a part of which is elastically expanded and contracted in the radial direction of the corgate tube while gripping the crest of the tip of the corgate tube, and the other part that contacts the end of the sealing material A ring that is inside the joint body and is disposed on the back side of the retainer when a corrugate tube is inserted and a crest at its tip is gripped by the ring and a force in the pulling direction is applied A retaining ring for receiving the retainer, and the retainer is attached to the sealing material or the sealing material when a force in the pulling direction is applied while the corrugate tube is inserted and the peak portion of the retainer is gripped by the ring. The base end portion that is directly pressed by the formed plate and is in close contact with the retaining ring, the thin portion formed in the circumferential direction at the base end portion, and the corrugate tube is inserted, and the peak portion at the tip is gripped by the ring When a force in the pulling direction is applied in this state, the inner diameter is reduced so that the tip side is rotated about the base end part by being pressed directly against the sealant or the plate attached to the sealant. By including a slanted inward projection that fits into the valley portion of the corrugate tube, a coupling mechanism that couples both by simply inserting a flexible tube into a single joint body, and a seal mechanism, Provided for installation Result, the joint structure can function in the structure of the joint body only, simplification of the structure, weight reduction, can be achieved cost reduction, reduction of transportation and transportation costs. In particular, it is possible to completely reduce the manufacturing cost by completely eliminating the press ring itself, which is different from connecting a flexible tube to the joint by screwing the press ring into a generally known joint body. It eliminates the need for packing between the main body and the press ring, simplifies the assembly process, and greatly shortens the time of the assembly process or operation. It is also advantageous in terms of component management. In connection work, the connection work can be completed in a very short time by simply inserting and inserting the corrugate tube of the flexible tube into the joint body after mounting the internal parts from the insertion opening. Further, the corrugate pipe can be inserted into the pipe joint with a light force and can be connected in a correct fitting state in a short time, and reliable sealing performance can be ensured. Further, when a pulling force is applied to the flexible tube, the inner diameter of the retainer is reduced by rotating around the base end of the obliquely inwardly protruding portion, so that the corrugate tube is inserted (primary fitting). When retaining the inner diameter of the retainer at a position where there is a sufficient gap where the inner diameter of the retainer does not come into contact, and when the ring is pulled out while holding the tip ridge (secondary fitting), corrugate As a result of securely engaging the inner diameter of the retainer with the trough of the pipe, the corrugate pipe can be easily and quickly inserted into the joint body, and the correct fitting connection and secure sealing function can be ensured. To do. 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. Furthermore, the inside of the stepped shape of the joint body only needs to form a recess or groove from the basic inner diameter to the circumference, and the machining can be performed continuously on a lathe without changing the setup, for example. It is.

Further, 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, the one end opening has a connection thread portion with a connected pipe member, A joint body having a second end opening that has a wall surface formed in a stepped shape so that the dust seal housing recess is adjacently disposed, and a retainer that is disposed inside the joint body and has an inner diameter larger than the maximum diameter of the corrugate pipe And a seal material disposed inside the joint body on the back side from the retainer, and a part of the seal material that is provided inside the joint body on the back side from the seal material and contacts the tip of the corgate pipe when the corgate pipe is inserted. While holding the tip of the corrugate pipe while elastically expanding and contracting in the radial direction of the corrugate pipe, the ring has another part that comes into contact with the end of the sealing material, and the inside of the joint body. A retaining ring that is disposed on the back side of the retainer and receives the retainer when a pulling direction force is applied in a state where the corrugate tube is inserted and the peak portion of the corrugate tube is gripped by the ring, The retainer is pushed directly by a sealing material or a plate attached to the sealing material when a force in the pulling direction is applied while the corrugate tube is inserted and the peak portion of the retainer is gripped by the ring. When a force in the pulling-out direction is applied in a state where the corrugate tube is inserted and the crest at the tip is gripped by the ring, the base end closely contacting the base, the thin wall formed in the circumferential direction at the base end The inner surface of the corrugate tube is fitted to the valley of the corrugate tube by reducing the inner diameter so that the distal end is rotated about the base end. And an orientation protrusion. As a result of providing a coupling mechanism that connects both of them simply by inserting a flexible tube and a sealing mechanism in one joint body, the joint structure can function as a structure with only the joint body. Simplification, weight reduction, cost reduction, transportation and transportation cost reduction can be achieved. In particular, it is possible to completely reduce the manufacturing cost by completely eliminating the press ring itself, which is different from connecting a flexible tube to the joint by screwing the press ring into a generally known joint body. It eliminates the need for packing between the main body and the press ring, simplifies the assembly process, and greatly shortens the time of the assembly process or operation. It is also advantageous in terms of component management. In connection work, the connection work can be completed in a very short time by simply inserting and inserting the corrugate tube of the flexible tube into the joint body after mounting the internal parts from the insertion opening. Moreover, the corrugate pipe can be inserted into the pipe joint with a light force and connected in a correct fitting state in a short time, and a reliable sealing performance can be ensured. In addition, when a pulling force is applied to the flexible tube, the inner diameter of the retainer is reduced by rotating around the base end of the oblique inward projection, so that the reliable retainer to the valley of the corrugate tube Engagement and outline of the insertion path to reduce the insertion resistance when inserting the corrugate tube and securing sufficient clearance of the set position before operation on the inner diameter side of the retainer can be realized at the same time. Ensures mating connection and secure sealing function. 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, for a joint having a structure in which a dust seal housing recess is disposed at the terminal portion, a structure in which a coupling mechanism that connects both of them simply by inserting a flexible tube into the joint body and a seal mechanism are provided so as to be incorporated. Can be realized.

In addition, the retainer has an inclined wall that is inclined downward in the insertion direction of the corrugate tube on its inner side, so that the inner diameter side of the retainer hits when the corgate tube is inserted so that the insertion resistance does not occur. 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.

Further, the retainer has a facing surface facing the retaining ring, and the facing surface has a base end portion having a thin 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 and hits the inner diameter side of the retainer, and then obliquely inwardly projects around the base end. Since the tip end side of the retainer rotates and closely contacts the retaining ring, the retainer can be set and inserted so that the inner diameter side of the retainer can be smoothly and stably reduced, and the entry of the corrugate tube is not obstructed. Time operation can be performed easily.

  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.

  In addition, by providing positioning support means assembled to the ring and mounted on the joint body in order to position the ring at a position and posture suitable for gripping the tip portion of the corrugate pipe inserted in the joint body, There is no need to provide a ring positioning step or flange structure on the inner side of the main body. When the joint body is assembled, it is simply inserted with the ring to grip the tip of the corrugate tube and to prevent the retainer from coming off. To help. At this time, if the support ring or the like is sandwiched and assembled in advance in the first and second inner peripheral portions of the ring or the like, the assembly work can be performed smoothly.

  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.

  In addition, the dust seal housing recess disposed adjacent to the flexible tube insertion opening of the joint body is provided with a dust seal that hermetically seals the inside and outside of the joint body, and the dust seal is provided with an air passage that communicates the inside and outside of the joint body. A gas leak detection semi-permeable member is fitted and integrated so as to block the air passage, and integrated into this using a dust seal placed at the boundary between the inside and outside of the joint. As a result of attaching the semi-transmissive member for detection, for example, it is possible to reduce the number of assembling steps without making a hole in the main body member such as a joint main body or a press ring or attaching it to the joint portion, and it is very easy to check the function after mounting. . In addition, parts management is easy, and the assembly work time of the joint body can be shortened.

  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. Also, when pulling out with a slight force after insertion, the base end of the retainer hits the retaining ring first, and then the slanted inward projection is gradually rotated around the base end of the retainer as a fulcrum. Therefore, the corrugate tube and the retainer can be engaged with each other with a short pulling distance, and as a result of the strong engagement 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, by moving the corrugate pipe into and out of the joint body, a series of almost one-touch operations, the movement of the diagonally inward projection in the radial direction through the axial diameter-reducing operation of the rotational position of the retainer This ensures a sufficient distance between the maximum diameter of the corrugate tube and the inner diameter side of the retainer, making it possible to adjust the clearance between them and to make the retainer easier to manufacture, and to facilitate and smoothly insert the corrugate tube. It is possible. 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.

  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.

  In the present embodiment, the pipe joint 10 is composed of only one pipe member as a joint body, and has a structure in which a member for connection to the flexible tube 1 and an airtight / watertight holding member are incorporated and integrated therein. . In the embodiment, the joint body 12 is a hollow short cylindrical tube formed in a stepped shape, is formed of a metal such as brass, and a gas pipe is provided on the outer periphery on the one end opening (connection side opening) 122 side. The external thread part 14 for connecting to a to-be-connected body, such as, and the hexagon part 16 for screwing the external thread part 14 are provided. In the present embodiment, the external thread portion 14 is a connection thread portion. From the other end opening (insertion opening 121) side of the joint body 12 to the inner periphery thereof, the dust seal housing recess 18, fireproof packing housing groove 20, retaining ring 21, retainer 22 and plate 24 are housed in order from the insertion opening side. A peripheral housing portion 26, a seal housing portion 28, a ring gripping housing portion 30 (30A, 30B), a ring housing portion 32, and a support ring housing portion 34 are provided. A support ring 36 is arranged in a press-fitted state in the support ring accommodating portion 34 in the joint body 12. The support ring 36 is formed of a metal such as brass, and the position and posture of the ring 29 in the joint body in the depth direction are determined so that the tip crest of the corrugate tube can be stably held.

The retaining ring 21 is disposed on the back side of the retainer 22 when a force in the pulling direction is applied to the corrugate tube in a state where the corrugate tube 4 is inserted and the peak portion 2M is gripped by the ring 29. It is a retainer receiving means that directly receives the retainer, and in this embodiment, is a stopper means that is fitted into a groove 40 that is recessed in the inner periphery of the joint body. In the present embodiment, the retaining ring 21 is formed of, for example, a stainless steel ring-shaped or C-shaped spring steel, and is inserted into the concave groove 40 when being assembled into the joint body. A part of the retaining ring 21 protrudes from the wall surface of the inner peripheral wall 13 in, for example, an arc shape in a state of being fitted in the concave groove 40, and a base end portion of a retainer, which will be described later, hits the protruding portion to be removed. Stop it. At this time, the retainer rotates about the base end portion (base end ring portion), and at the same time, the oblique inwardly protruding portion 381 is closed, and the notch 383 is brought into close contact with the retainer to further rotate around the base end portion. The tip of the oblique inward projection 381 is fitted into the valley 3 of the corrugate tube while being regulated to prevent the flexible tube from being pulled out from the joint.

A dust seal 60 made of a circular ring-shaped elastic body is mounted along the circumferential direction in the dust seal housing recess 18 on the insertion opening 121 side of the joint body 12, and the inner protrusion 62 of the dust seal 60 is a corrugate tube 4. It can be tightly sealed with a synthetic resin tube-like covering 5 that covers the outer periphery of the outer periphery of the outer periphery of the material, thereby preventing entry of intruders from the outside. In the present embodiment, the dust seal 60 is integrally provided with a gas leak detecting semi-permeable member 50 on the seal. The gas leak detection semi-permeable member 50 is preferably made of a material that selectively performs a permeation function so that, for example, gas or other gas permeates but liquid or solid does not permeate. For example, chemical synthesis or synthetic resin stretching. It can be manufactured using processed materials, other synthetic resins, compounds, nonwoven fabrics, inorganic materials, composite materials thereof, and the like. For example, as an example, a rod-shaped member made of a continuous porous ultra-high molecular weight polyethylene sintered body as shown in FIG. 1 is formed, and a water repellent is applied to the surface to apply a water repellent finish. It is preferable to use the semi-permeable member 50 for detecting gas leakage. The dust seal 60 is originally disposed at the boundary between the joint body inside and the outside air, and a part of the dust seal 60 is always exposed to the outside air. Therefore, the gas leak detection semipermeable member 50 is integrally disposed in the dust seal itself in an embedded state. As a result, the process of attaching the gas leakage detection semi-permeable member can be greatly simplified, and the gas leakage detection function can be stabilized. That is, the small-bar-shaped semi-permeable member 50 for detecting gas leakage is formed in a through hole 61 as a ventilation passage formed so as to communicate the inside of the joint main body and the outside (outside air side) with a part of the ring-shaped dust seal. The gas seal detection semi-transparent member 50 is pushed into the hole and attached to the dust seal, and the dust seal 60 is simply attached to the dust seal accommodating recess 18 to instantly attach the dust seal. The attachment of the semipermeable member for gas leak detection as the selective permeation function member can be completed. The gas leak detection semi-transmission member 50 makes the gas leak state visible to the outside at an early stage so that the abnormal state can be detected early by the sensor.

  A fireproof packing accommodating groove 20 is recessed in the inner side of the dust seal accommodating recess 18 inside the joint body with a partition wall 19 disposed in the middle, and a fire resistant packing 64 is mounted in the fire resistant packing accommodating groove 20. The fireproof packing 64 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.

  In FIG. 1, a recessed groove 40 is provided in the circumferential direction on the inner side of the fireproof packing 64, and the retaining ring 21 described above is fitted thereto. Further, an inner peripheral accommodating portion 26 in the joint main body is provided further on the inner side of the joint ring 21 of the retaining ring 21, and the inner peripheral accommodating portion 26 is directed from the flexible tube insertion opening side of the joint main body toward the connecting screw portion side. The retainer 22 and the plate 24 are arranged in this order. The plate 24 is interposed between a seal packing 46, which will be described later, and the retainer 22 located on the inner side of the plate 24, and the metal retainer 22 directly contacts the seal packing to damage or damage the packing, thereby reducing the sealing performance. Is a ring-shaped plate that can be freely slid in the axial direction within the inner peripheral wall 13. The surface on the insertion opening 121 side of the plate 24 abuts on the retainer 22 when a force is applied in the pulling direction of the corrugate tube, while the surface on the far end side in the joint body abuts on the insertion opening side of the seal packing 27. .

  A seal packing 27 is disposed on the back side of the plate 24, that is, in the seal housing portion 28 in the joint body 12, and a ring 29 and a support ring 36 are disposed in the joint body 12 on the back side of the seal packing 27. Yes.

The retainer 22 is formed of a metal such as brass, and is disposed in an inner peripheral accommodating portion 26 at a substantially central position in the axial direction of the joint body as shown in FIGS. 1, 3, 6, and 7, and the retainer 22 is arranged at one end side. A slanted inward projection 281 that is formed on the inner periphery and is pushed by an axial pulling force against the seal packing 27 to engage with the corrugate tube valley 3, and is formed on the outer periphery on the other end side of the retainer. A proximal ring portion 282 that comes into contact with the retaining ring 21 and stops when pressed by a pulling force in a direction, and is formed in an axial direction from one end side to the other end side with a spacing along the circumferential direction. It has a plurality of cuts 283 and a thin portion 284 for deformation formed on the other end side, and its inner diameter is formed larger than the maximum diameter of the corrugate tube 4. In the embodiment, the retainer 22 is a deformed ring having a deformed isosceles triangular section formed by bending only one opposing side into a square shape, and two leg portions having a triangular cross section at each end of the square shape. Forming. One leg portion forms an oblique inward projection portion 281, and the other leg portion forms an opposing projection portion 285 that connects to the proximal ring portion 282. The cut 283 is cut from the oblique inward projection 281 toward the proximal ring portion 282, and is terminated at the thin wall portion 284 leaving a small connection portion. The base end ring portion 282 is a base end portion connected in a ring shape including the thin wall portion 284, and obliquely inwardly about the base end ring portion 282 when the retainer is pressed against the seal packing by the axial pulling force. It becomes an axis | shaft which rotates the front end side of the protrusion part 281 toward the trough part of a corrugate pipe | tube. That is, the base end ring portion 282 is a plate that is attached to the seal material 27 when a force in the pulling direction is applied in a state where the corrugate tube 4 is inserted and the crest portion 2M of the tip end is gripped by the ring 29 ( Or it is pushed directly by the sealing material) and hits the retaining ring 21 to be stopped. The retainer 22 is provided with another leg portion having a facing surface that faces the retaining ring 21, and this facing surface has a force in the pulling direction in a state where the ring 29 is gripped by the tip peak portion 2M of the corgate tube 4. The base end ring portion 282 having the thin wall portion 284 is set as an inclined wall 287 that inclines in the insertion direction so as to hit the retaining ring 21 first. As will be described later, when a force is applied in the pulling direction from the insertion opening 121 side of the flexible tube 1, that is, the corrugate tube 4, a force that presses the inner diameter of the oblique inward projection 281 is applied, The proximal ring portion 282 of the retainer 22 comes into contact with the retaining ring 21, and the distal end side of the oblique inward protruding portion 281 is rotationally deformed in the diameter reducing direction with the proximal ring portion 282 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 projecting portion 285, which is one of the leg portions, is pushed in the direction of the insertion opening 121 when the diameter of the rotation centering on the proximal end ring portion 282 of the oblique inward projecting portion 281 is reduced. Gradually, the cut walls are brought into close contact with each other so that the opposing projection 285 is not pushed in the direction toward the insertion opening 121 beyond the retaining ring 21.

  The retainer 22 has an inclined wall that is inclined downward in the insertion direction of the corrugate tube. In the present embodiment, the inclined wall faces the slanted inwardly protruding outer sloped wall 288, the slanted wall 286 that faces the slanted inwardly projecting outer sloped wall 288, and the retaining ring. An inclined wall 287. The slanting inwardly protruding outer sloped wall 288 and the sloped wall 286 constitute one leg. In addition, 285A is a square-shaped curved inner surface facing the inclined wall 287. As a result, the lower end side of both the leg portions is disposed obliquely so that the inner diameter side of the retainer 22 does not hit against the insertion resistance when the corgate tube 4 is inserted, and a pulling force is applied to the corgate tube so that seal packing or the like is applied. When the retainer is pushed through the diameter, the diameter reduction rotation toward the center side of the retainer can be smoothly performed by hitting from the inclined end side.

  The plate 24 is formed of a metal such as a thin stainless plate, and prevents the seal packing 27 from being caught in the retainer cut 283 when the retainer 22 is deformed.

The seal packing (seal material) 27 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 in order to reduce resistance when the corrugate pipe is inserted. In order to ensure stable sealing performance, the inner diameter of the seal packing 27 is smaller than that of the corrugate tube. In this embodiment, since the seal packing 27 is formed of a material containing a lubricant, the corrugate tube 4 can be inserted more smoothly.

  1 to 5, when the corrugate pipe is inserted into the joint body, the ring 29 grips or engages the back end of the corgate pipe or the peak portion 2 near the back end, and then pulls out the corgate pipe. This embodiment is a tip end gripping means for inserting a corgate pipe that prevents the corgate pipe from being pulled out via the retainer 22 when it is moved in the direction so as to contact the seal packing 27 existing on the insertion opening side from the ring. When the corrugate tube is inserted into the joint body, the first peak portion 2M at the back end of the corgate tube is gripped. As shown in FIGS. 4 and 5, the ring 29 includes a base B and a gripping part G, stabilizes the accommodation state in the joint body by the base B, and is located at the back of the corrugate tube inserted by the gripping part G. The end first peak 2M is gripped and gripped. The ring 29 is formed of a metal such as thin spring steel, and is disposed in the ring housing portion 32 in the joint body 12. The corrugate pipe 4 is inserted and the ring 29 is the first peak at the back end of the corgate pipe. In order to ensure the retaining by the retainer from the state where 2M is gripped, it is moved to the ring gripping accommodating portion 30A and further to 30B while gripping the tip peak portion of the corrugate tube 4 when pulled in the pulling direction. . The ring 29 is provided inside the joint body 12 on the back side of the seal material, and abuts against the first peak portion 2 at the tip or back end of the corgate pipe 4 when the corgate pipe 4 is inserted from the insertion opening 121 side. In addition to having a part for gripping the tip of the corrugate tube while elastically expanding and contracting in the radial direction of the corgate tube, the other part abuts on the end of the seal member 27.

  The ring has a ring base 291 having an inner diameter larger than the maximum diameter of the corrugate tube 4, a first inner peripheral protrusion 292 extending from the ring base, and another direction different from the first inner peripheral protrusion from the ring base. A second inner peripheral protrusion 293 extending from the ring base, and an outer peripheral protrusion 294 extending from the ring base so as to engage with the inner wall of the joint body. The first inner peripheral protrusion 292 protrudes in the inner diameter direction from the ring base 291 and inserts the peak portion of the corgate pipe inward while elastically expanding and contracting in the radial direction of the corgate pipe when the corgate pipe is inserted. The second inner peripheral protrusions 293 protrude in the inner diameter direction from the ring base 291 and are alternately formed in the peripheral direction with the first inner peripheral protrusions 292. The second inner peripheral protrusion 293 is integrally extended from the ring base at a different length and angle from the first inner peripheral protrusion 292, and the tip of the corgate pipe is restricted at the tip thereof. It has a protrusion 293A for preventing shake. The outer peripheral projection 294 is provided on the outer periphery of the ring base and elastically expands in the circumferential direction to engage with the joint body.

  Specifically, in FIGS. 3, 4, and 5, the ring 29 includes a first inner peripheral protrusion 292, a second inner peripheral protrusion 293, and an outer peripheral protrusion 294 that are integrally connected to an annular ring base 291. The first inner peripheral protrusion 292 and the second inner peripheral protrusion 293 engage with the ridge 2 at the tip of the corrugate tube, respectively, and the outer peripheral protrusion 294 moves to a predetermined position and moves to the joint body 12. It engages with the inner ring grip accommodating portion 30. That is, the outer peripheral projection 294 located at the outermost portion is provided in a circumferential shape with a shape bent to a certain back end side, but the first and second inner peripheral projections are formed as donuts as shown in FIG. A plurality of blade pieces formed by cutting a disk into a gear shape are alternately pushed and bent at a required angle in either direction to form a gap for gripping the first peak portion of the corrugate tube. The second inner peripheral protrusion 293 is formed with a protrusion 293A having a distal end directed toward the center in the radial direction. For this reason, the peak portion 2 at the distal end of the corrugate tube 4 is connected to the second inner peripheral protrusion 293. It cannot be passed. Here, the base B is constituted by the ring base 291 and the outer peripheral projection 294, and the first and second inner peripheral projections 292 and 293 constitute the grip portion G.

  In the present embodiment, as shown in FIGS. 1 to 3 and FIGS. 8 and 9, the ring grip accommodating portion 30 includes first and second ring grip accommodating portions 30A and 30B. 30 A of 1st ring holding | accommodating accommodating parts are diameter-expanded by a little level difference from the ring accommodating part 32, and are arrange | positioned at the insertion opening side of the coupling main body 12, and the 2nd ring grasping | accommodating part 30B is further the 1st ring grasping | accommodating accommodating part. The diameter of the joint body 12 is increased by a small step and further disposed on the opening side of the joint body 12. The second ring gripping / accommodating portion 30 </ b> B is formed with a diameter that is slightly larger than the seal accommodating portion 28. When the corrugate tube is once inserted into the innermost part and then pulled out a little, the outer peripheral projection 294 of the ring 29 is fitted into the second ring gripping accommodating part 30B via the first ring gripping accommodating part 30A. At this time, the tip of the oblique inward projection 281 of the retainer 22 is engaged with the valley 3 of the corgate pipe 4 to prevent the corrugate pipe from being pulled out. When the outer peripheral projection 294 of the ring 29 is engaged with the second ring gripping housing 30B, the lock 29 is locked, and the corrugate tube 4 is prevented from being pulled out. On the contrary, the corgate tube 4 is inserted again into the joint body 12 inside. 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 with a large movement, and damage to the corgate pipe can be prevented in advance.

  In FIG. 2, when the corrugate tube is inserted, the support ring 36 receives the innermost first peak portion between the first and second inner peripheral projections 292 and 293 of the ring 29 and securely grips this. This is a positioning support means for positioning to a position and posture suitable for performing the above-described operation. In the embodiment, the positioning support means is constituted by a thin cylindrical ring body having a certain depth width. The back end side of the support ring 36 is abutted against the back end abutting wall of the joint body, and the insertion opening side is sandwiched between the outer peripheral protrusion 294 and the second inner peripheral protrusion 293 of the ring 29. The support ring 36 is assembled to the ring and attached to the joint body. As a result, the ring 29 can determine the positions and postures of the outer peripheral protrusion 294 and the second inner peripheral protrusion 293 inside the joint body. For example, as shown in FIG. Sometimes, it can surely hit the seal packing 27 and push it to the drawing side. In the figure, 90 is the same joint axis as the axis in the joint direction.

  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, the seal packing 42, the plate 24, and the retainer 22 are sequentially inserted and mounted in the joint body 12. The retaining ring 21 is fitted inside, and the fireproof packing 64 and the dust seal 60 are attached, and the assembly of the parts into the joint body 12 is completed. From this state, as shown in FIG. 1, the flexible tube 1 in a state in which the trough 3 of the corrugate tube 4 is cut and the covering 5 is removed at the top of the corrugate tube 4 is inserted into the joint body. It is inserted from the opening 121 toward the inside of the joint body. At this time, the tip of the corrugate tube 4 passes through the inner periphery of the fireproof packing 64 and the retainer 22 in a non-contact state, while passing through the inner periphery of the seal packing 27 while being in pressure contact. When the crest 2M at the tip of the corrugate tube 4 reaches the ring 29, 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 292, the peak portion 2M of the tip of the corrugate tube 4 is gripped by the first inner peripheral protrusion 292 and the second inner peripheral protrusion 293 (see FIG. 2). Due to the protrusion 293A at the tip of the second inner peripheral protrusion 293, the peak 2M at the tip of the corgate tube 4 cannot pass through the second inner protrusion 293 further toward the far end.

  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 29 holding the peak portion 2M of the tip of the corgate pipe 4 has an adjacent seal packing 27, When the plate 24 is moved in the pulling direction and pulled to a predetermined position, the outer peripheral projection 294 of the ring 29 expands in the circumferential direction and engages with the ring gripping accommodating portion 30A in the joint body 12. At this time, the operator feels the feeling when the outer peripheral projection 294 of the ring passes through the stepped wall, and when the force is further applied in the pulling direction, the tip of the outer peripheral projection 294 is inserted into the second ring grip accommodating portion 30B, Engaging with the joint body 12 prevents the ring 29 and the flexible tube 1 from moving in the insertion direction. As a result, even if either a pulling force or a pushing force is applied to the corrugate pipe in a locked state, it can be prevented that the corgate pipe is damaged by sliding excessively in the joint body. Specifically, when the ring 29 moves in the pulling direction, a force in the pulling direction acts on the retainer 22 via the seal packing 27 and the plate 24. At this time, the plate 24 hits the distal end portion of the oblique inward projection 281 of the retainer provided to be inclined downward in the insertion direction, and pushes it toward the insertion opening 121 while using the proximal ring portion 282 as a fulcrum R. The tip is rotated to reduce the inner diameter. At this time, the base end ring portion 282 of the retainer 22 hits the retaining ring 21 on the back surface side of the retainer, and the base portion R of the base end ring portion 282 including the thin-walled portion 284 serves as a fulcrum, and the oblique inward protruding portion 281 of the retainer 22. Is rotated and deformed greatly in the diameter reducing direction, whereby the outer periphery of the valley 3 of the corrugate tube 4 and the oblique inward projection 281 of the retainer 22 are reliably engaged. Since the engagement between the protrusion 281 and the corrugate tube trough 3 is reliably obtained by the rotational deformation of the oblique inward protrusion 281 of the retainer, the peak portion 2 when the corgate tube 4 is inserted and the inner peripheral side of the retainer 22 Can be provided with a sufficiently large interval, so that the flexible tube 1 can be easily inserted with a light effort, and the retainer 22 can be manufactured with a certain degree of accuracy. In addition, the adhesion of the seal packing 27 to the inner peripheral side can be easily adjusted. The seal packing 27 positioned between the ring 29 and the retainer 22 is compressed by the ring 29 and the retainer 22 and expands in the inner diameter direction, thereby improving the sealing effect. Thus, if the corrugate pipe | tube 4 is completely inserted to the back of the coupling main body 12, it will engage with the retainer 22 by pulling the flexible tube 1 by an operator's hand next, and the state of FIG. The construction work is completed.

  As described above, since the plug-in type pipe joint of the present embodiment is provided so as to be able to incorporate the coupling mechanism that couples the two by only inserting the flexible tube and the seal mechanism in one joint body. At that time, the connection work can be completed almost instantaneously by suddenly inserting the corrugate tube of the flexible tube into the joint body after mounting the internal parts and inserting it through the insertion opening. Further, the joint structure can function with a structure having only the joint body, and the structure can be simplified, reduced in weight, reduced in cost, and reduced in transportation and transportation costs. In addition, for example, unlike a generally known fitting body in which a press ring is screwed into a joint body and a flexible tube is connected to the joint, the press ring itself is completely unnecessary, and the manufacturing cost can be greatly reduced. It eliminates the need for packing between the joint body and the press ring, simplifies the assembly process, and greatly reduces the time of the assembly process or operation. It is also advantageous in terms of component management.

Further, according to the embodiment of the insertion pipe joint, the corrugate pipe tip is inserted into the ring arranged on the back side of the sealing material by inserting the corgate pipe from the insertion opening of the joint body toward the inside of the joint body and pushing it deeply. After the part is gripped, the ring and sealing material move in the axial direction by pulling in the pulling direction, and the retainer pushed in the pulling direction through the sealing material and plate hits the retaining ring and centers on the proximal ring part. While rotating, the inner diameter is reduced and engaged with the valley of the corrugate tube. At that time, the margin for pulling and moving is determined by the ring gripping and accommodating portion 30, and the short stroke is moved in a short time without wasteful sliding movement. The retainer stopped by the retaining ring 21 rotates on the leg side with the base end ring portion as a fulcrum, and gradually closes the gaps of the plurality of cuts 283 so that the cut walls are in close contact with each other. The oblique inward projection 281 is displaced to, for example, the maximum diameter-reduced position and reliably restricts the further pulling movement. At this time, the tip of the oblique inward projection 281 is fitted into the valley 3 of the corrugate tube 4. 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 the above-described embodiment, a dust seal-embedded gas leak is provided for a type in which a dust seal receiving recess is terminated at the insertion opening of the flexible tube, and the flexible tube can be inserted and connected with only one joint body. Although an example of installation of a semi-permeable member for detection is shown, a hole formed by molding a semi-permeable member for gas leakage detection so that it can be embedded into a dust seal to be sealed inside and outside of the joint body, and formed in the dust seal For example, for a type having a push ring that is screwed into a threaded portion of a joint body, for example, without being limited to the above embodiment, the structure of the push ring is not limited to the above embodiment. As a structure that incorporates a dust seal in which the gas leak detection semi-permeable member 50 is fitted in the terminal opening portion It is effective.

In addition, in the plug-in type pipe joint of the present embodiment, the joint body and the flexible tube cannot be disassembled and removed, and the joint is a one-way, one-time connection type. Removing the pipe joint part and disassembling its internal parts and using it after reassembly is usually not considered in view of disassembly, reassembly time, labor, and operating costs. Considering the fact that it is done, there is almost no disadvantage in practical use.

  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.

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.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flexible tube 4 Corrugate pipe 10 Plug-in type pipe joint 12 Joint main body 121 Insertion opening 122 Connection side opening 21 Retaining ring 22 Retainer 27 Seal packing 29 Ring 30 Ring grip accommodation part 32 Ring accommodation part 50 Gas leak detection semi-permeable member 60 Dust seal 281 Diagonal inward protrusion 282 Base ring part 283 Notch 284 Thin part 285 Opposing protrusion 291 Ring base 292 First inner peripheral protrusion 293 Second inner peripheral protrusion 294 Outer peripheral protrusion R fulcrum

Claims (8)

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 retainer disposed inside the joint body and having an inner diameter larger than the maximum diameter of the corrugate tube;
A sealing material arranged inside the joint body on the back side from the retainer;
It is provided inside the joint body on the back side of the seal material, and when the corrugate pipe is inserted, it abuts the tip of the corgate pipe and a part of the end of the corgate pipe elastically expands and contracts in the radial direction of the corgate pipe. While holding the mountain part, a ring having another part that comes into contact with the end part of the sealing material;
Stops to receive the retainer inside the joint body, when the corrugate tube is inserted and a force in the pulling direction is applied with the crest of the tip held by the ring. A ring, and
The retainer
When a corrugate tube is inserted and a crest at its tip is gripped by the ring and a force in the pulling direction is applied, it is pushed directly by the seal material or a plate attached to the seal material and closely contacts the retaining ring A proximal end;
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 And a slanted inward projection that fits into a trough of the corrugate tube by reducing the inner diameter so that the tip side is rotated about the center. In a plug-in type pipe joint for connecting a flexible tube formed of a corrugated pipe, it has a connection threaded portion with a pipe member to be connected at one end opening, and an inner wall surface is formed in a step shape, and a dust seal housing recess is adjacent A joint body having an opening at the other end terminated to be disposed;
A retainer disposed inside the joint body and having an inner diameter larger than the maximum diameter of the corrugate tube;
A sealing material arranged inside the joint body on the back side from the retainer;
The tip of the corrugate tube, which is provided inside the joint body on the back side of the seal material and abuts against the tip of the corgate tube when the corgate tube is inserted, and part of the corgate tube is elastically expanded and contracted in the radial direction of the corgate tube And a ring having another part that contacts the end of the sealing material,
Stops to receive the retainer inside the joint body, when the corrugate tube is inserted and a force in the pulling direction is applied with the crest of the tip held by the ring. A ring, and
The retainer
When a corrugate tube is inserted and a crest at its tip is gripped by the ring and a force in the pulling direction is applied, it is pushed directly by the seal material or a plate attached to the seal material and closely contacts the retaining ring A proximal end;
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 And a slanted inward projection that fits into a trough of the corrugate tube by reducing the inner diameter so that the tip side is rotated about the center. The plug-in type pipe joint according to claim 1 or 2, wherein the retainer has an inclined wall that is inclined downward in the insertion direction of the corrugate pipe. The retainer has a facing surface facing the retaining ring,
The opposing surface is an inclined wall oriented in the insertion direction so that the base end portion having a thin portion first hits the retaining ring when a force is applied in the pulling direction with the ring held at the tip of the corrugate tube The plug-in type pipe joint according to any one of claims 1 to 3, characterized in that it is set. 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;
5. The plug-in according to claim 1, further comprising an outer peripheral protrusion provided on an outer periphery of the ring base and elastically expanding in a circumferential direction to engage with the joint main body. Type pipe fittings.   In order to position the ring in a position and posture suitable for gripping the distal end portion of the corrugate tube inserted in the joint body, positioning support means is provided which is assembled to the ring and attached to the joint body. The plug-in type pipe joint according to any one of claims 1 to 5.   The plug-in type pipe joint according to any one of claims 1 to 6, wherein a plate for preventing the entrapment of the seal material due to rotational deformation of the retainer is disposed between the retainer and the seal material. The dust seal housing recess disposed adjacent to the flexible tube insertion opening of the joint body is provided with a dust seal that hermetically seals the inside and outside of the joint body,
The dust seal is provided with a ventilation path that connects the inside and outside of the joint body.
The plug-in type pipe joint according to any one of claims 1 to 7, wherein a semi-permeable member for gas leak detection is fitted and integrated so as to block the air passage.

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