JP2009019665A - Corrugated pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain seal performance of a corrugated pipe joint connecting corrugated pipes for a long period. <P>SOLUTION: The corrugated pipe joint comprises a joint body 10 having a through hole 16 for insertion of the corrugated pipe T, a push nut 20 having an end inserted in the through hole 16 and formed with a seal member receiving part 29 at a tip of the end, a sleeve 30 arranged on an inner diameter side of the push nut 20 for abutment of an end of the corrugated pipe T inserted, a seal member 40 arranged on an outer peripheral side of the sleeve 30 and a nonslip member 50 held on the inner diameter side of the push nut 20, and presses the seal member 40 and the nonslip member 50 in a diameter reducing direction by sliding the push nut 20 to a through hole 16 side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a joint for a corrugate pipe that connects a corgate pipe used for a gas supply pipe or the like, and more particularly to improvement of sealing performance and workability over a long period of time.

  In general, a flexible pipe made of a bellows-like metal corrugate pipe and a joint for a corgate pipe connecting the same are widely used for gas supply pipes for city gas and the like from the viewpoint of workability and the like. As a joint for a corgate pipe, for example, Patent Document 1 discloses a corgate pipe by a main body having an inner hole into which an end of the corgate pipe is inserted and a connection portion with another pipe, and a claw inserted into an annular recess on the outer surface of the corgate pipe. , A retainer that seals between the corrugate tube and the main body, and a slidably engaged with the main body, and the retainer in a state where the corgate pipe is locked to the main body at a specific sliding position. There is described a joint for a corrugate pipe provided with a retainer presser for locking.

  Patent Document 2 accepts a resin protective cylinder attached to the outer periphery of a stainless steel bellows tube, a rubber packing attached to an end annular groove of the bellows tube, and an end portion of the bellows tube fitted with the rubber packing. A joint body having a receiving port on an inner surface of the end portion, a retainer ring having a convex portion on the outer peripheral surface and fixed by integrally caulking the resin protective tube and the bellows tube on the outer surface of the end portion of the resin protective tube; and the retainer A metal flexible hose made of a cap nut that clamps the convex portion of the ring to the end of the joint body is disclosed.

JP 2004-316733 A JP-A-6-265067

However, since the gap between the inner surface of the cylindrical joint and the outer periphery of the tip of the corrugate pipe is sealed with the ring-shaped sealing material, the roundness of the tip of the corrugate pipe is sealed. The performance will be directly affected. That is, if the tip of the corrugate tube is flattened, for example, in the elliptical shape, the seal performance decreases in a short time due to a decrease in seal surface pressure in the short diameter portion, and the seal surface pressure increases more than necessary in the long diameter portion. In the long term, however, the sealing material is permanently set, and there is a concern that the sealing performance may be lowered due to the deterioration of the elastic force of the sealing material. Therefore, it is necessary to manage the flatness of the corrugate pipe at the construction site.
Also, the inner diameter of the ring-shaped seal material must be smaller than the outer diameter of the corrugate tube, and when cutting the tip of the corgate tube, forgetting to remove burrs and burrs when cutting at the peak of the corgate tube In such a case, the inner surface of the ring-shaped sealing material may be damaged at the tip of the corrugate tube, leading to leakage.

  On the other hand, according to the metal flexible hose described in Patent Document 2, since the rubber packing is attached to the end annular groove (corrugated tube valley) of the bellows tube, the deformation and scratches on the outer peripheral surface of the corrugated tube are prevented. It is considered that all sealing properties are secured.

  However, the metal flexible hose described in Patent Document 2 requires the work of inserting the corrugate pipe into the receiving port of the joint main body and further tightening the cap nut after attaching the rubber packing to the valley of the corrugate pipe. Since such a complicated operation is required, there has been a problem in that the position where the rubber packing is attached to the valley portion of the corrugate tube is mistaken or the cap nut or the retainer ring is lost.

  The present invention has been devised in order to effectively solve the above-mentioned problems, and is a joint for corrugate pipes that connects the corgate pipes even if the corgate pipes have some flatness or deformation. The purpose is to supply a joint for corrugate pipes that can maintain the sealing performance for a long time and has excellent workability.

  The present invention includes a joint main body having a through hole into which a corrugate pipe is inserted, a push nut having one end inserted into the through hole, and a seal member housing portion formed at the one end, and an inner diameter side of the push nut. The corrugate tube comprising: a sleeve that is disposed and abutted with a tip of the inserted corgate tube; a seal member disposed on an outer peripheral surface of the sleeve; and a retaining member that is held on the inner diameter side of the push nut. When the sleeve is inserted into the push nut, the sleeve is pushed by the tip of the corrugate tube and slides in the depth direction of the joint body, and the seal member is fitted to the outer peripheral surface of the corgate tube. It is a joint for pipes.

  According to the above configuration, since the seal member is arranged on the outer peripheral surface of the sleeve before the corgate tube is inserted, there is no possibility of damaging the seal member at the tip of the corgate tube in the process of inserting the corgate tube. Therefore, a stable sealing property can be maintained over a long period of time.

In the present invention, it is preferable that the seal member and the retaining member are pressed in the diameter-reducing direction by sliding the push nut toward the through hole, and the seal member is a valley portion of the corrugate tube. It is preferable to fit.
According to this configuration, by sliding the push nut toward the through-hole side, the seal member and the retaining member are pressed in the diameter reducing direction. Therefore, by pressing the seal member in the radial direction, the corrugate The sealing surface pressure from the outside toward the inside is improved by making flexible contact along the outer peripheral surface of the tube. Therefore, even when the corrugate tube is somewhat flattened or deformed, it is possible to maintain a stable sealing performance for a long time by adding a strong sealing property of the thick portion and a flexible sealing property of the thin portion.
Further, the valley portion of the corrugate tube is less likely to be deformed or distorted than the peak portion of the corgate tube, and the seal member is fitted to the valley portion of the corgate tube to ensure a more stable sealing performance. Can do.

  Moreover, in the joint for a corrugate pipe, it is preferable that a cross section of the sleeve has a substantially U-shape including a tip of the corgate pipe.

  Moreover, in the joint for a corrugate tube, it is preferable that the through hole has an engaging portion that is engaged with the sleeve when the corrugate tube is inserted. According to this configuration, it is possible to recognize that the corgate pipe has been inserted to a predetermined position in the joint body due to the response when the sleeve engages with the engaging portion, and the corrugate pipe is insufficiently inserted. The accompanying construction failure can be prevented.

  According to the corrugate pipe joint according to the present invention, since the seal member is disposed on the outer peripheral surface of the sleeve before the corgate pipe is inserted, the seal member is inserted at the tip of the corgate pipe in the process of inserting the corgate pipe. There is no risk of damage, and thus a stable sealing property can be maintained over a long period of time.

  Moreover, according to the joint for corrugate pipes according to claim 2, the seal member and the retaining member are pressed in the diameter reducing direction by sliding the push nut toward the through hole side. By pressing in the radial direction, the sealing surface pressure from the outside toward the inside is improved by flexibly contacting along the outer peripheral surface of the corrugate tube. Therefore, even when the corrugate tube is somewhat flattened or deformed, it is possible to maintain a stable sealing performance for a long time by adding a strong sealing property of the thick portion and a flexible sealing property of the thin portion.

  Furthermore, according to the joint for corrugate pipes according to claim 3, since the seal member is configured to fit into the valley of the corrugate pipe, long-term sealing performance when the corgate pipe has some flatness or deformation As the corrugate pipe is inserted, the sleeve slides in the depth direction of the joint body, and the seal member fits into the valley of the corgate pipe, so the joint parts can be lost or troublesome construction work can be done. It is not necessary and the workability is greatly improved.

[First Embodiment]
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a half sectional view of an embodiment of a joint for a corrugate pipe according to the present invention, FIG. 2 is a perspective view of an embodiment of a push nut according to the present invention, and FIG. 3 is a perspective view of an embodiment of a sleeve. 4 is a perspective view of an embodiment of a retaining member according to the present invention, FIG. 5 is a half sectional view showing a state in which the corrugate pipe is inserted into the joint for corrugate pipe of the present invention, and FIG. The half sectional view of the state which completed connection construction is shown.

  As shown in FIG. 1 and FIG. 2, the joint 1 for a corrugate pipe includes a joint body 10 having a through hole portion 16 into which a corrugate pipe T is inserted from one end side, a head portion 21 having a large diameter on one side, and a head portion 21 on the other side. The insertion portion 24 has a small diameter, and the insertion portion 24 is inserted into the through-hole portion 16 of the joint body 10. It mainly comprises a sleeve 30 with which the tip of the corrugate tube T abuts, a seal member 40 disposed on the outer peripheral surface of the sleeve 30, and a retaining member 50 held on the inner diameter side of the push nut 20. A male threaded portion 14 for connecting to another piping member and a tool engaging portion 15 for screwing the male threaded portion 14 into the other piping member are formed on the outer surface of the joint body 10 at the other end side. ing.

  The through hole portion 16 of the joint body 10 is formed with a first locking groove 17 having a tapered surface whose diameter is reduced toward the back direction of the through hole portion 16 (right direction in the figure). A locking step portion 18a having the same diameter as the diameter of the first locking groove 17 and a large-diameter step portion 18b connected to the locking cut portion 18a and having a diameter larger than that of the locking step portion 18a are formed in the rear direction. ing. On the other hand, a locking groove 25 is formed in the insertion portion 24 of the push nut 20. And the stop ring 61 is arrange | positioned so that the 1st locking groove 17 and the locking groove 25 may be straddled. The stop ring 61 is a metal C-shaped ring having elasticity. When the insertion portion 24 of the push nut 20 is inserted into the through hole portion 16 of the joint body 10, the stop ring 61 is retracted and stored in the locking groove 25. When the first locking groove 17 is reached, the diameter is slightly increased, whereby the joint body 10 and the push nut 20 are connected in advance.

  A detachable color ring 65 is disposed between one end face of the joint body 10 and the head portion 21 of the push nut 20. When the color ring 65 is removed and then the push nut 20 is slid into the hole 16 and pushed in, the stop ring 61 is reduced in diameter along the tapered surface of the first locking groove 17, and the thickness of the color ring 65 is reduced. The push nut 20 can be slid as much as possible, and when reaching the locking step 18a, the stop ring 61 expands in diameter and is arranged so as to straddle the locking step 18a and the locking groove 25. Thus, the push nut 20 is locked so as not to be detached from the joint body 10 (see FIG. 6).

  Further, a disassembly ring 63 having a predetermined thickness is sandwiched between one end face of the joint body 10 and the head portion 21 of the push nut 20. When the disassembly ring 63 is removed, the disassembly ring 63 is removed. The push nut 20 can be pushed into the through hole portion 16 of the joint body 10 by the thickness of. Then, when the disassembling ring 63 is removed and the push nut 20 is further pushed into the back side of the hole portion 16, the stop ring 61 moves from the position of the locking step portion 18a to the large diameter step portion 18b, where the stop ring Since 61 expands in diameter, the connection between the joint body 10 and the push nut 20 is released. As a result, the joint body 10 and the push nut 20 can be disassembled. This configuration may be provided as necessary, and is useful when it is desired to remove the corrugate pipe for some reason after it is connected to the corrugate pipe joint 1.

  On the inner surface side of the insertion portion 24 of the push nut 20, a first taper inner surface 28 a that expands toward the tip, a retaining member housing portion 27 that continues to the diameter expansion side of the first taper inner surface 28 a, and a tip that expands toward the tip. A second taper inner surface 28b having a diameter and a seal member accommodating portion 29 connected to the diameter-expanding side of the second taper inner surface 28b are formed.

  A spacer 54 made of a ring-shaped resin material is fitted between the retaining member accommodating portion 27 and the second tapered inner surface 28 b, and the sleeve 30 with the seal member 40 mounted on the outer peripheral surface is connected to the spacer 54. The seal member accommodating portion 29 is disposed between the tip protrusions 29 a formed at the tip. As shown in FIG. 3, the sleeve 30 is a ring-shaped member in which one end is expanded in a trumpet shape and a tube contact portion 31 that is divided into a plurality of segments is formed.

  Further, as shown in FIG. 4, the retaining member 50 is a metal member obtained by processing a coil spring into a ring shape. The inner diameter of the retaining member 50 is larger than the outer diameter of the corrugate tube T in an unloaded state. Even in the state of being housed in the housing, the housing is housed so as to be slightly larger than the outer diameter of the corrugate tube T. Accordingly, at the stage of inserting the corrugate tube T, the retaining member 50 can be smoothly inserted without being engaged with the peak portion T2 of the corgate tube T.

  Next, the seal member 40 is an O-ring rubber elastic member, and nitrile butadiene rubber (NBR) having a Shore A hardness of about 70 is optimal because it needs to maintain the seal performance for a long period of time. In the no-load state, the seal member 40 is set so that its inner diameter is smaller than the outer diameter of the corrugate tube T and is elastically expanded to the outer diameter of the sleeve 30.

  Further, a concave portion 11a and an inner diameter convex portion 11b protruding from the concave portion 11a are formed on the back side of the joint body 10, and a fireproof packing 44 is provided in the back of the concave portion 11a.

  The fireproof packing 44 fills a mold with, for example, a rubber compound obtained by kneading raw material rubber, a graphite intercalation compound that is thermally expanded in a non-foamed state, and, if necessary, a filler, a softening material, a vulcanizing agent, etc. And then press vulcanized. The graphite intercalation compound is, for example, a compound in which silver sulfate is bonded between layers obtained by reacting sulfuric acid with graphite (a hexagonal crystal of carbon in which six-membered ring polymer layers are overlapped in layers), and is 170 ° C. or more When heated to 800 ° C to 1000 ° C, the apparent volume increases to 100 to 250 times when heated to 800 ° C to 1000 ° C. As the raw rubber, natural rubber (NR), nitrile butadiene rubber (NBR), chloroprene rubber (CR), ethylene-propylene rubber (EPDM), silicone rubber (Q) and the like can be used. The fireproof packing 44 is preferably manufactured with a composition and conditions such that the Shore A hardness is in the range of 50 to 80 from the viewpoint of the sealing function.

  When the corrugate pipe joint 1 is exposed to a high temperature due to a fire or the like, the seal member 40 is burned out, but the refractory packing 44 is thermally expanded and fills the space of the seal part 29 from the recess 11a. Sealing the outer diameter prevents gas leaks from occurring during a fire and increasing damage.

  Further, an O-ring groove 23 is formed in the insertion portion 24 of the push nut 20, and a watertight O-ring 47 is attached thereto. The insertion hole 22 of the push nut 20 is provided with a watertight packing 48. Accordingly, entry of moisture, dust, and the like from the outside is prevented inside the joint for the corrugate pipe.

Further, the push nut 20 is provided with a vent hole 26 penetrating from the insertion hole portion 22 to the insertion portion 24, and a selectively permeable member 60 is provided.
The selectively permeable member 60 is made of a sheet material including a continuous porous film formed by pressing and solidifying the tetrafluoroethylene resin powder, and has continuous fine pores of 0.1 to 5 μm, A gas having a characteristic of allowing a gas such as air or water vapor to pass through but repelling a liquid such as water can be cited. Or it is a porous body having continuous pores formed from a thermoplastic resin powder such as polyethylene, polypropylene, polymethyl acrylate, polystyrene, ethylene vinyl acetate copolymer, tetrafluoroethylene polymer, etc., or polyvinyl alcohol and formaldehyde You may use the porous sheet material etc. which have the continuous pore shape | molded by making this react with an acid catalyst.

These selectively permeable members have air permeability and moisture permeability that allow gas such as air and water vapor to pass therethrough, while also having waterproof properties that do not allow liquid such as water and chemicals to pass through. Excellent chemical resistance, heat resistance, weather resistance, etc. Therefore, the permeation and penetration of solids (such as dust) and liquids (water, dew, etc.) from the outside into the joint are prevented, and moisture and dust are prevented from entering from the outside for a long time after piping construction, and the interior is corroded. The problem does not occur.

  Specifically, the inner surface of the resin coating layer T6 coated on the outer periphery of the corrugate tube T is provided with irregularities (not shown) in the longitudinal direction of the tube. When struck, the leaked gas is guided along the unevenness to the selectively permeable member 60, and the selectively permeable member 60 allows gas such as gas and air to pass through. The presence or absence of leakage can be detected by using a gas leak sensor or the like.

  Next, a procedure for connecting the corrugate pipe T to the corrugate pipe joint 1 and its operation will be described in detail with reference to FIGS. 5 and 6.

  As shown in FIG. 5, when the corrugate pipe T is inserted into the corrugate pipe joint 1, since the inner diameter of the retaining member 50 is larger than the outer diameter of the corgate pipe T, the corgate pipe T is smoothly inserted up to the spacer 54. In other words, the corrugate tube T contacts the tube contact portion 31 of the sleeve 30. When the corgate tube T is further pushed in, the sleeve 30 is separated from the seal member 40 by the pushing force of the corgate tube T. And it is pushed in until the sleeve 30 contacts the inner diameter convex part 11b.

  On the other hand, the diameter of the seal member 40 is once expanded to the seal member accommodating portion 29 when the peak portion T2 of the corrugate tube T passes. After the peak portion T2 passes, the seal member 40 is set to have a smaller inner diameter than the outer diameter of the corrugate tube T in the no-load state, so that the seal member 40 is reduced in diameter after being separated from the sleeve 30. , And the first trough T4 from the tip of the corrugate tube T is fitted. During this process, the tip of the corrugate tube T does not come into contact with the seal member 40, so that the seal member 40 is not damaged by the tip of the corgate tube T.

  Then, as shown in FIG. 6, the collar ring 65 arranged between the joint body 10 and the push nut 20 is removed, and the push nut 20 is slid in the depth direction of the joint body 10 and pushed. Then, since the seal member 40 is fitted in the valley portion T4 of the corrugate tube T, the retaining member 50 is fixed to the first tapered surface 28a so that the spacer 54 keeps the distance between the seal member 40 and the retaining member 50 constant. Press on. The first tapered inner surface 28 a formed on the push nut 20 contracts the retaining member 50 in the diameter reducing direction, and the retaining member is engaged with the valley portion of the corrugate tube T.

  The second tapered inner surface 28b of the push nut 20 presses the seal member 40 in the diameter-reducing direction at substantially the same time that the retaining member 50 engages with the valley of the corrugate tube, and the valley of the seal member 40 and the corrugate tube T The seal surface pressure can be improved. That is, since the seal member 40 is an elastic member made of rubber, it follows the shape of the outer peripheral surface of the corrugate tube T, and even if the corgate tube T has undergone some flat deformation, it is deformed accordingly and the seal surface pressure is reduced. maintain. Further, it is known that the valley portion of the corrugate tube T is less affected by flatness, deformation, scratches, and the like than the mountain portion of the corgate tube T. That is, since the sealing member 40 is provided so as to seal the valley of the corrugate tube T, the airtightness of the corgate tube T can be stably maintained.

  The compression rate of the seal member 40 (= crush amount / seal member cross-sectional diameter) is preferably provided so as to be compressed by about 25% on average. Therefore, even if the corrugate tube is deformed somewhat flat, the compression rate of the thin portion 42b can be 10% or more on the short diameter side of the flat tube, and 40% or less on the long diameter side of the flat tube, A stable sealing performance can be ensured over a long period of time.

  When the pulling direction force is applied to the connected corrugate tube T, the retaining member 50 tries to move in the diameter-reducing direction by the first tapered inner surface 28a of the push nut 20, so that the retaining member 50 and the corrugated tube T Engagement with the valleys is strengthened, and the corrugate tube T is prevented from being pulled out.

[Second Embodiment]
Next, a second embodiment will be described with reference to FIGS. FIG. 7 is a half sectional view of a second embodiment of the joint for a corrugate pipe of the present invention, FIG. 8 is a perspective view of one embodiment of the sleeve in the second embodiment of the present invention, and FIG. 9 is a corrugate of the present invention. FIG. 10 is an enlarged partial sectional view of a portion A in FIG. 9, and FIG. 11 is a second embodiment of the joint for corrugate tubes of the present invention. The half sectional view of the state where the connection construction of the corrugate pipe in the example is completed is shown.
In addition, the same structure as the joint for corrugate pipes shown to FIGS. 1-6 attaches | subjects the same code | symbol, and abbreviate | omits the description.

  As shown in FIG. 7, the corrugate joint 1 </ b> A has an engagement portion 19 formed on the outer periphery of the inner diameter convex portion 11 b of the joint body 10 </ b> A. Further, as shown in FIG. 8, the sleeve 30A is a member having a substantially U-shaped cross section, and a plurality of U-shaped recesses 32 in which the distal end portion of the corrugate tube T is accommodated and a plurality of engaging portions 19 engaged with the inner diameter side. A claw portion 34 made of a segment is formed.

  The seal member 40 is fitted to the outer peripheral surface of the sleeve 30A, and is held in a state where the diameter is further expanded as compared with the case of the corrugate pipe joint 1 shown in FIG.

  As shown in FIG. 9, when the corrugate pipe T is inserted into the corrugate pipe joint 1, the inner diameter of the retaining member 50 is larger than the outer diameter of the corgate pipe T, and therefore the corgate pipe T is smoothly inserted up to the sleeve 30A. The distal end portion of the tube is inserted into the U-shaped recess 32 of the sleeve 30A. That is, in this process, the tip of the corrugate tube T does not come into contact with the seal member 40, so there is no possibility that the seal member 40 is damaged by the tip of the corgate tube T.

When the corrugate tube T is further pushed in, the sleeve 30 </ b> A is separated from the seal member 40. As shown in FIG. 10, the sleeve 30 reaches the inner diameter convex portion 11 b of the joint body 10, and the claw portion 34 of the sleeve 30 </ b> A engages with the engaging portion 19 of the joint body 10. Since the response and sound at this time can recognize that the corgate pipe T has been inserted up to the predetermined position of the joint 1 for corrugate pipe, it is possible to prevent a construction failure due to insufficient insertion of the corgate pipe.
On the other hand, the seal member 40 has an inner diameter set smaller than the outer diameter of the corrugate tube T in an unloaded state and is held in an expanded state by the sleeve 30A. Then, the corrugate tube T is fitted to, for example, the third valley T4 from the tip.

  Then, as shown in FIG. 11, the collar ring 65 disposed between the joint body 10A and the push nut 20 is removed, and the push nut 20 is slid into the depth direction of the joint body 10A and pushed. Then, since the seal member 40 is fitted in the valley portion T4 of the corrugate tube T, the retaining member 50 is fixed to the first tapered surface 28a so that the spacer 54 keeps the distance between the seal member 40 and the retaining member 50 constant. Press on. The first tapered inner surface 28 a formed on the push nut 20 contracts the retaining member 50 in the diameter reducing direction, and the retaining member is engaged with the valley portion of the corrugate tube T.

  At substantially the same time as the retaining member 50 engages with the corrugate tube, the second tapered inner surface 28b of the push nut 20 presses the seal member 40 in the direction of diameter reduction, and the seal member 40 and the valley portion of the corgate gate T are formed. The seal surface pressure can be improved. That is, since the seal member 40 is an elastic member made of rubber, it follows the shape of the outer peripheral surface of the corrugate tube T, and even if the corgate tube T has undergone some flat deformation, it is deformed accordingly and the seal surface pressure is reduced. maintain. Further, it is known that the valley portion of the corrugate tube T is less affected by flatness, deformation, scratches, and the like than the mountain portion of the corgate tube T. That is, since the sealing member 40 is provided so as to seal the valley of the corrugate tube T, the airtightness of the corgate tube T can be stably maintained.

As described above, the joint for a corrugate pipe according to the present invention has the seal member disposed on the outer peripheral surface of the sleeve, so that the seal member can be prevented from being damaged at the tip of the corgate pipe in the process of inserting the corgate pipe. . Further, since the seal member is pressed against the valley of the corrugate pipe by the slide of the push nut, the sealing performance can be maintained for a long time even if the pipe is flattened or deformed. In addition, if the sleeve is provided with a claw portion and an engagement portion is formed on the joint body side, the corrugate pipe is formed by the response and sound when the sleeve claw portion and the engagement portion of the joint body are engaged. It can recognize that it has been inserted to a predetermined position, and can prevent construction failure due to insufficient insertion of the corrugate tube.
The shape of the joint for a corrugate pipe according to the present invention is not limited to a single screw socket having a male thread portion at one end, and may have both sockets, elbows, tees, or female threads. Further, the joint structure of the present invention can be integrally provided at the end of a device such as a gas stopper or a gas meter.

It is a half sectional view of one example of a joint for corrugate pipes of the present invention. It is a perspective view of one example of a push nut in the present invention. It is a perspective view of one Example of the sleeve in this invention. It is a perspective view of one Example of the securing member in this invention. It is a half sectional view of a state where a corrugate pipe is inserted into the joint for corrugate pipe of the present invention. FIG. 5 is a half cross-sectional view of a state in which the construction for connecting the corrugate pipe to the corrugate pipe joint of the present invention is completed. It is a half sectional view of the 2nd example of the joint for corrugate pipes of the present invention. It is a perspective view of one Example of the sleeve in the 2nd Example of this invention. It is a half sectional view of the state where the corrugate pipe in the 2nd example of the joint for corrugate pipes of the present invention was inserted. It is an expanded partial sectional view of the A section in FIG. It is a half sectional view of the state where connection construction of the corrugate pipe in the 2nd example of the joint for corrugate pipes of the present invention was completed.

Explanation of symbols

1, 1A: Corrugate pipe joint,
10, 10A: Joint body, 11a: Concave portion, 11b: Convex portion, 12: Step portion, 14: Male screw portion, 15: Tool hook portion, 16: Through hole portion, 17: First locking groove, 18a: Engagement Stopped portion, 18b: large diameter step portion, 19: engaging portion,
20: push nut, 21: head portion, 22: insertion hole portion, 23: O-ring groove, 24: insertion portion, 25: locking groove, 26: vent hole, 27: retaining member accommodating portion, 28a: first Tapered inner surface, 29: seal member accommodating portion,
30, 30A: Sleeve, 31: Tube contact portion, 32: U-shaped concave portion, 34: Claw portion,
40: seal member, 44: fireproof packing, 47: watertight O-ring, 48: watertight packing,
50: retaining member, 54: spacer 60: selective permeability member, 61: stop ring, 63: ring for disassembly, 65: coloring ring,
T: Colgate tube, T2: Mountain, T4: Valley, T6: Resin coating layer,

Claims (5)

A joint body having a through hole into which the corgate pipe is inserted;
A push nut having one end inserted into the through hole and a seal member housing portion formed at the one end;
A sleeve that is arranged on the inner diameter side of the push nut, and a tip of the inserted corrugate tube contacts,
A seal member disposed on the outer peripheral surface of the sleeve;
It consists of a retaining member held on the inner diameter side of the push nut,
When the corrugate pipe is inserted into the push nut, the sleeve is pushed by the tip of the corgate pipe and slides in the depth direction of the joint body, and the seal member is fitted to the outer peripheral surface of the corgate pipe. Corrugate pipe fittings.   The joint for a corrugate pipe according to claim 1, wherein the seal member and the retaining member are pressed in the diameter-reducing direction by sliding the push nut toward the through hole.   The said seal member fits into the trough part of the said corrugate pipe | tube, The joint for corrugate pipe | tube in any one of Claim 1 or 2 characterized by the above-mentioned.   4. The joint for a corrugate pipe according to claim 1, wherein a cross-section of the sleeve has a substantially U-shape including a tip of the corrugate pipe. 5.   The joint for a corrugate pipe according to any one of claims 1 to 4, wherein the through-hole has an engaging portion for locking the sleeve when the corrugate pipe is inserted.

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