JP4968585B2 - Plug-in fitting - Google Patents

Description

  The present invention relates to a plug-in type pipe joint for inserting and connecting a pipe used for a gas supply pipe or the like, and particularly relates to confirmation of pipe insertion and improvement of sealing performance over a long period of time.

  Generally, a flexible pipe made of an inexpensive galvanized steel pipe or a bellows-like metal corrugate pipe and a plug-in pipe joint for connecting the same are widely used for gas supply pipes for city gas and the like. As a corrugate pipe joint for connecting a flexible pipe, for example, in Patent Document 1, an annular seal material is arranged inside a cylindrical joint, and the tip of the corrugate pipe enters the inside of the annular seal material. It is configured to be in close contact with the outer periphery of the tip of the corrugate tube and to exhibit the required sealing performance between the joint and the corrugate tube, and the tip of the corgate tube enters the predetermined position inside the sealant. At this time, a member that exhibits a click action by cooperating with the corrugate pipe is provided in the inside of the joint. A joint for a flexible tube configured to emit is described.

  In addition, as a joint that can stably obtain a seal surface pressure between a corrugate pipe and a joint over a long period of time, for example, in Patent Document 2, a tubular joint body and a packing housing portion of the body are attached to the tip of the corgate pipe. A packing that seals the outer periphery, a nut that is screwed to one end of the main body and that is fitted with a push pin member that is movable toward the back side in a receiving port portion into which the corgate tube is inserted, and an inner diameter through which the corgate tube can be inserted. A substantially cylindrical sleeve that is provided so as to be movable toward the back side and presses the packing when the compression spring is in a free state, and is formed in a ring shape and elastically expands and contracts. A coil spring that is fitted into the portion, expanded in diameter, and mounted on the outer periphery of the sleeve-side end portion of the sleeve, and movement from the inner side to the inner side of the nut is prevented from moving from the back to the receiving side. A first collar member mounted on the outer periphery of one end of the sleeve in a state where both the axial slits are widened, a compression spring accommodated between the first collar and the second collar in a compressed state, and a receiving side There is described a joint for a flexible pipe, which includes a second collar member having one end abutting on the push pin member and a part on the inner diameter side locked so as to push the sleeve back. And according to this structure, since a packing is pressed with the urging | biasing force of a compression spring, it is supposed that a seal surface pressure can be obtained stably over a long period of time.

Japanese Patent No. 3564466 JP-A-7-103382

However, since the joint for flexible tubes described in Patent Document 1 seals the gap between the inner surface of the tubular joint and the outer periphery of the tip of the corrugate tube with a ring-shaped sealing material, the roundness of the tip of the corrugate tube is low. The seal 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.
On the other hand, according to the joint for flexible pipes described in Patent Document 2, since the packing is pressed by the urging force of the compression spring, the seal surface pressure can be stably obtained over a long period of time, but the number of parts is large and the cost is increased. was there. In addition, since a configuration such as a coil spring is required, there has been a problem that a flexible pipe joint becomes large and it is difficult to perform piping work in a narrow construction space such as under the floor or behind the ceiling.

  The present invention focuses on the above problems and was devised to effectively solve this problem. In the plug-in type pipe joint for connecting pipes, the pipes were particularly flat or deformed. Even in this case, the purpose is to supply a plug-in type pipe joint that maintains the sealing performance of the pipe joint over a long period of time and facilitates and surely confirms the insertion of the pipe.

  The present invention is a plug-in type having a joint main body having a through hole into which a pipe is inserted, a seal member disposed in the through hole, and a retaining member for preventing the pipe from coming out of the joint main body. In the pipe joint, the seal member is disposed on a deeper side of the joint body than the retaining member, and has a thick portion that is in contact with an inner peripheral surface of the through hole, and the through hole connected to the thick portion. A thin portion that does not contact the inner peripheral surface of the joint body, and is provided so that the thin portion is disposed on the back side of the joint body. Plug-in type pipe joint with a compression ring. It is.

  By adopting the above-described configuration, the seal member generates a seal surface pressure from the inside to the outside due to the press-fitting of the pipe, and the compression ring is formed in the reduced diameter direction of the compression member. Since it presses, the sealing surface pressure which contacts flexibly along the outer peripheral surface of a pipe | tube and faces inward from the outer side improves. Therefore, even when the tube is somewhat flattened or deformed, a stable sealing performance can be maintained over a long period of time by adding a strong sealing property for the thick portion and a flexible sealing property for the thin portion.

In the present invention, the compression ring is provided with a movable piece that holds the compression ring in an expanded state, and when the tube is inserted into the joint body, the tip of the tube causes the movable piece to be detached. Accordingly, it is preferable to reduce the diameter of the compression ring and compress the thin portion of the seal member.
According to this configuration, since the movable piece is detached by inserting the pipe in addition to maintaining the sealing performance for a long time, when the pipe is inserted to a predetermined position of the joint body, the sound or response when the pipe is detached The tube can be reliably constructed by this insertion confirmation function.

In the present invention, it is preferable that the movable piece includes a fitting portion to be fitted to the compression ring main body and a ring-shaped abutting portion to be brought into contact with the distal end of the tube.
According to this configuration, since the contact portion is ring-shaped, the movable piece stays inside the joint main body after the movable piece is detached from the compression ring. Therefore, it is possible to prevent the movable piece from dropping into the pipe and becoming a foreign substance in the pipe, and adversely affecting the valves and devices constituting the pipe line.

The present invention is the above-described plug-type pipe joint, wherein the pipe is a corrugate pipe having an outer peripheral surface formed with irregularities, and one end of the pipe is inserted into the through hole to engage with the joint body, One end has a nut member having a tapered inner surface that expands toward the tip, and a claw that is disposed at the tip of the nut member and engages with a valley of the corrugate tube, and has a tapered outer surface on the back surface of the claw. It can be set as the plug-in type pipe joint which consists of a retainer.
In the plug-in type pipe joint, it is desirable that the retainer has the tapered outer surface of the retainer urged against the tapered inner surface of the nut member by a spring having one end supported on the inner surface of the joint body.

  Further, the present invention provides the plug-type pipe joint, wherein the pipe is a corrugate pipe having irregularities formed on an outer peripheral surface, and one end of the pipe is inserted into the through hole so as to be slidable with respect to the joint body. And a nut member having a tapered inner surface that expands toward the tip at the one end, and a retaining ring that can be reduced in diameter and is disposed at the tip of the nut member and engages with a valley portion of the corrugate tube. It can be set as the plug-in type pipe joint which becomes.

  According to these configurations, it is possible to reliably connect a corrugate pipe having irregularities formed on the outer peripheral surface, and to make sure that the insertion is confirmed and to provide a plug-in pipe joint with excellent long-term sealing performance. it can.

  According to the plug-in type pipe joint according to the present invention, the thick wall portion of the seal member generates a seal surface pressure from the inside to the outside due to the press-fitting of the tube, and the thin ring portion compresses the thin wall portion of the seal member. Since the pressing is performed in the radial direction, the sealing surface pressure that is flexibly contacted along the outer peripheral surface of the pipe and is directed from the outside to the inside is improved. Therefore, even when there is some flatness or deformation in the pipe, the outer peripheral surface of the pipe and the inner peripheral surface of the pipe joint are joined by the addition of a strong sealing property for the thick-walled portion and a flexible sealing property for the thin-walled portion. A stable sealing property can be maintained over a long period of time.

  The best mode of the present invention will be described with reference to FIGS. FIG. 1 is a half sectional view of an embodiment of the plug-in type pipe joint of the present invention, and FIG. 2 is a half cross-sectional view of a state in which a corrugate pipe is being inserted into the plug-in type pipe joint of the present invention. FIG. 3 is a perspective view of an embodiment of the compression ring according to the present invention, and FIG. 4 is a half sectional view showing a state in which the corrugate pipe is connected to the plug-in pipe joint of the present invention.

[First Embodiment]
As shown in FIG. 1, the plug-in-type pipe joint 1 has a through hole portion 16 formed in a step shape into which a corrugate pipe is inserted from one end side, and another piping member on the outer surface on the other end side. A joint body 10 in which a male screw portion 14 is formed, a ring-shaped airtight packing (seal member) 42 disposed inside the through-hole portion 16, and a head portion 21 having a large diameter on one side. A nut member 20 having a small diameter insertion portion 24 on the other side, the insertion portion 24 being inserted into the through hole portion 16 of the joint body 10, and a corrugate tube disposed at the tip of the nut member 20. The retainer 50 has a claw portion 52 that engages with the trough portion.

  In addition, a first locking groove 17 is formed in the through hole portion 16 of the joint body 10, and the second locking groove is made deeper than the diameter of the first locking groove 17 in the depth direction of the through hole portion 16. A groove 18 is formed. On the other hand, a locking groove 25 is formed in the insertion portion 24 of the 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 nut member 20 is inserted into the through hole portion 16 of the joint body 10, the stop ring 61 is reduced in diameter to the locking groove 25. The joint body 10 and the nut member 20 are connected in advance.

  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 nut member 20. When the disassembly ring 63 is removed, the disassembly ring 63 is removed. The nut member 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 nut member 20 is pushed into the through hole 16, the stop ring 61 moves from the position of the first locking groove 17 to the second locking groove 18, where the stop ring Since 61 expands in diameter, the connection between the joint body 10 and the nut member 20 is released. Thereby, the joint body 10 and the nut member 20 can be disassembled. This configuration may be provided as necessary, and is useful when it is desired to remove the tube for some reason after the tube is connected to the plug-in fitting 1.

  In addition, a tapered inner surface 28 that expands toward the tip is formed inside the insertion portion 24 of the nut member 20, and has a tapered outer surface 54 that is formed so as to face the tapered inner surface 28. A retainer 50 having a claw portion 52 that engages with a valley portion T4 of the corgate tube T is disposed. The retainer 50 receives the urging force of the spring 67 through the spacer 65 and is pressed against the tapered inner surface 28.

As shown in FIG. 2, when the corrugate pipe T is inserted into the plug-in pipe joint 1, the peak portion T <b> 2 of the tip of the corgate pipe T comes into contact with the claw portion 52 of the retainer 50 and compresses the spring 67. Is separated from the tapered surface 28 of the nut 20, and the tip crest portion of the pipe advances while expanding the claw portion 52, so that the corrugate pipe T can be inserted.

  Returning to FIG. 1, the airtight packing 42 is a ring-shaped rubber elastic member that includes a thick part 42 a and a thin part 42 b, and is formed integrally with the thick part 42 a, and is located behind the through hole 16 of the joint body 10. It is arranged (rightward in the drawing). The outer diameter side of the thick portion 42a is set to be larger than the inner diameter of the inner peripheral surface of the through hole portion 16 of the joint body 10, and is press-fitted so as to tightly adhere to the through hole portion 16 of the joint body 10, The joint body 10 is locked to the projection 19 of the through hole 16 so as not to come out to the near side. On the other hand, the inner diameter side is provided slightly smaller than the outer diameter of the corrugate tube T.

  On the other hand, the thin-walled portion 42b of the airtight packing 42 is disposed so as to protrude to the back side of the through-hole portion 16 of the joint body 10, and the inner diameter thereof is the same as or slightly larger than the outer diameter of the corgate pipe T. The corrugate tube can be easily inserted, and a compression ring 70 is provided on the outer peripheral side. And the length of the thick part 42a and the thin part 42b has the length which can seal the peak part T2 of the corrugate pipe | tube T by two here, and the outer diameter of the corgate pipe | tube T is sealed airtightly .

  As shown in FIG. 3A, the compression ring 70 includes a ring main body 72 that is divided at one circumferential portion and a movable piece 74 that holds the ring main body 72 in an expanded state. The movable piece 74 is a substantially T-shaped member as shown in FIG. 3B, and the fitting portion 74 b of the movable piece 74 is sandwiched between the split portion 72 a of the ring main body 72 and is detachably fitted. The movable piece 74 is formed with an abutting portion 74 a that abuts on the tip of the tube so as to protrude toward the inner diameter side of the ring main body 72. In addition, it is preferable that the movable piece 74 is temporarily fixed to the split part 72a using an adhesive or the like so that the movable piece 74 is not dropped before the corrugate pipe T is applied to the plug-in pipe joint 1. As the material of the compression ring, “carbon tool steel”, “alloy tool steel”, “spring steel” and the like can be used. For example, a spring characteristic can be obtained with a Vickers hardness of Hv 700 or more after quenching and tempering treatment. desirable. Further, “spring phosphor bronze” subjected to annealing treatment or pre-hardened steel (so-called heat treatment unnecessary steel) may be used.

  As shown in FIG. 4, when the corrugate tube T is further inserted, the tip of the corgate tube T comes into contact with the contact portion 74a of the movable piece 74, and the movable piece 74 is detached from the split portion 72a of the ring body 72, As shown in FIG. 3B, the diameter of the compression ring 70 is reduced. Therefore, returning to FIG. 4, the detached movable piece 74 is accommodated in the outer peripheral space of the small-diameter convex portion 15 and there is no possibility of being mixed into the pipeline. Further, since the compression ring 70 is externally attached to the thin portion 42b of the hermetic packing 42, the thin portion 42b is compressed in the diameter reducing direction, and a seal surface between the inner peripheral surface of the thin portion 42b and the outer peripheral surface of the corrugate tube T is compressed. The pressure can be improved. That is, since the hermetic packing 42 is an elastic member made of rubber, it follows the shape of the outer peripheral surface of the corrugate tube T. Even if the corgate tube T is slightly flattened or deformed, the sealing surface pressure is maintained, Stable sealing performance can be ensured.

  Further, when the tip of the corrugate tube T disengages the movable piece 74 from the ring main body 72, the response and a snapping sound are emitted. This response or sound makes it possible to recognize that the corgate pipe T has been inserted up to a predetermined position, so that it is possible to prevent a construction failure due to an insufficient amount of the corgate pipe T being inserted into the corrugate pipe joint 1. be able to.

  The relationship between the outer diameter of the thin portion 42b of the hermetic packing 42 and the inner diameter when the compression ring 70 is reduced is preferably provided so that the thickness of the thin portion 42b is 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.

  In FIG. 3B, the split portion 72a of the compression ring 70 from which the movable piece 74 has been detached is reduced in diameter in a ring shape that is in contact with each other, but the outer diameter of the thin portion 42b of the airtight packing 42 In a state where the thin portion 42b is pressed by the correlation, a form in which the end surfaces of the ring main body 72 do not come into contact with each other is preferable. That is, if the split portion 72a is not in contact with each other, the pressing force to the thin portion 42b is maintained, and permanent deformation occurs due to compression of the thin portion 42b over a long period of time. Even if the diameter is reduced, the pressing force can be maintained in the thin portion 42b.

  When a pulling direction force is applied to the connected corgate pipe T, the retainer 50 tries to move in the diameter-reducing direction by the tapered inner surface 28 of the nut member 20, so that the claw 52 and the trough part T4 of the corgate pipe T are provided. And the corrugate tube T is prevented from being pulled out.

Nitrile butadiene rubber (NBR) is the most suitable for the airtight packing 42 because it needs to maintain the sealing performance for a long period of time. Specifically, in a pipe joint in a form that hermetically seals the outer peripheral surface of a conventional corrugate pipe, the hermetic packing allows the corrugate pipe to flexibly follow the outer peripheral face of the corrugate pipe in order to ensure the insertability of the corgate pipe into the pipe joint. The hardness was adjusted to about 50. However, a hermetic punkin having a low hardness is likely to cause a permanent set, and it has been difficult to secure a long-term sealing property to a flat tube.
Therefore, the Shore A hardness is set to about 70, and the compression rate (= squashing amount / packing wall thickness) of the hermetic packing is 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. Sealability can be secured.

  The airtight packing 42 is integrally provided with a ring-shaped guide 46 having an L-shaped cross section, and a ring-shaped fireproof packing 44 is held by the guide 46.

  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 sulfate radicals are bonded between layers obtained by reacting sulfuric acid with graphite (a hexagonal crystal of carbon in which six-membered ring polymer layers are layered), and is 170 degrees 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 degrees in terms of the sealing function.

  When the plug-in fitting 1 is exposed to a high temperature due to a fire or the like, the hermetic packing 42 is burned out, but the refractory packing 44 is thermally expanded and seals the outer diameter of the corrugate pipe T, so that the gas in the event of a fire. This prevents leaks from expanding and causing damage.

  In particular, when the refractory packing 44 is thermally expanded, the guide 46 moves rightward toward the drawing so as to fill the space where the airtight packing 42 has been burned down, but is prevented from moving by the inner diameter protrusion 19 of the joint body 10. The As a result, the fireproof packing 44 is prevented from expanding in the right direction as viewed in the drawing, so that the expansion force is more reliably applied to the outer peripheral portion of the corrugate tube T, and the sealing performance can be maintained.

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

Further, the nut member 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.

[Second Embodiment]
FIG. 5 shows a sectional view of a second embodiment of the hermetic packing according to the present invention. The airtight packing 420 shown in FIG. 5 has a structure in which an extremely thin connecting portion 42c is formed between the thick portion 42a and the thin portion 42b, and the airtight packing 42 of the plug-in pipe joint 1 shown in FIG. It can replace and implement.

  As shown in FIG. 5, the hermetic packing 420 forms an ultrathin connecting portion 42c in which the thick portion 42a and the thin portion 42b are continuous in the circumferential direction. With this configuration, when the compression ring 70 is reduced in diameter and presses the thin portion 42b, the pressing force is not transmitted to the thick portion 42a, so that the sealing performance of the thick portion 42a is affected. Can not be.

[Third Embodiment]
6A and 6B are perspective views of a third embodiment of the compression ring according to the present invention. FIG. 6A shows a state in which the movable piece is fitted to the ring body, and FIG. 6B shows the movable piece from the ring body. Indicates a state of withdrawal. FIG. 7 is a half sectional view of a third embodiment of the plug-in type pipe joint of the present invention to which the compression ring shown in FIG. 6 is applied. Since members other than the compression ring 700 constituting each part of the plug-in type pipe joint 100 have the same structure as that of FIG. 1, the same reference numerals are given and the description thereof is omitted.

  As shown in FIG. 6A, the movable piece 740 of the compression ring 700 has a contact portion 740a formed in a ring shape and is fitted so as to sandwich the fitting portion 740b in the split portion 720a of the ring body 720. Can do. When the corgate tube T is inserted, the tip of the corrugate tube T comes into contact with the contact portion 740a, and the movable piece 740 is detached from the ring body 720.

  As a result, the compression ring 700 has a reduced diameter as shown in FIG. 6B, and presses the thin portion 42b of the hermetic packing 42 as shown in FIG. 7 to improve the seal surface pressure. At the same time, it is possible to recognize that the corrugate tube T has been inserted into a predetermined position of the plug-in joint 100 by response or sound when the movable piece 740 is detached.

  Now, the contact portion 740a of the movable piece 740 of the compression ring 700 has a ring shape. Therefore, when the movable piece is detached from the compression ring, the movable piece stays inside the joint body, and the movable piece falls into the pipe and becomes a foreign substance in the pipe, which may adversely affect the valves and devices constituting the pipe line. Can be prevented. Further, since the movable piece 740 does not fall into the pipe, it is not necessary to form the small-diameter convex portion 15 inside the joint as shown in FIG. 1, and the machining cost can be reduced correspondingly.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIGS.
FIG. 8 is a half sectional view of the fourth embodiment of the plug-in type pipe joint of the present invention, FIG. 9 is a perspective view of the fourth embodiment of the retaining member in the present invention, and FIG. 10 is the plug of the present invention. FIG. 11 is a half sectional view of the fourth embodiment of the pipe-type pipe joint with the corrugate pipe inserted, and FIG. A cross-sectional view is shown. Among the components of the plug-in type pipe joint 200, the same configurations as those of the plug-in type pipe joint shown in FIGS. 1 to 7 are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 8, the plug-in type pipe joint 200 has a through hole portion 86 formed in a step shape into which a corrugate pipe is inserted from one end side, and another piping member on the outer surface on the other end side. A joint body 80 in which a male thread portion 84 is formed for connection to the airtight seal 42, an airtight packing 42 as a ring-shaped seal member disposed inside the through hole portion 86, and a head portion 91 having a large diameter on one side. And the other end has a small-diameter insertion portion 94, and a push nut 90 that is inserted into the through-hole portion 86 of the joint body 80, and a corrugate pipe disposed at the tip of the push nut 90. The coil ring (prevention member) 56 that engages with the trough portion is mainly used.

  Further, the through hole portion 86 of the joint body 80 is formed with a taper groove portion 87 having a tapered surface whose diameter is reduced toward the back direction of the through hole portion 86 (right direction in the drawing). A first locking groove 88a having the same diameter as that of the taper groove 87 and a second locking groove 88b connected to the first locking groove 88a and having a larger diameter than the first locking groove 88a are formed in the rear direction. ing. On the other hand, a locking groove 95 is formed in the insertion portion 94 of the push nut 90. And the stop ring 61 is arrange | positioned so that the taper groove part 87 and the latching ditch | groove 95 may be straddled. When the insertion portion 94 of the push nut 90 is inserted into the through-hole portion 86 of the joint body 80, the stop ring 61 is housed with a reduced diameter in the locking groove 95, and slightly when it reaches the position of the taper groove portion 87. The diameter of the joint is increased, whereby the joint body 80 and the push nut 90 are connected in advance.

  Then, after removing the collar ring 99, when the push nut 90 is slid into the hole portion 86 and pushed in, the stop ring 61 is reduced in diameter along the tapered surface of the tapered groove portion 87, and the thickness of the collar ring 65 is reduced. Only when the push nut 90 is slidable and reaches the first locking groove 88a, the stop ring 61 expands in diameter and is disposed so as to straddle the first locking groove 88a and the locking groove 95. The push nut 90 is locked so as not to be detached from the joint body 80 (see FIG. 11).

  Further, a taper inner surface 98 having a diameter increasing toward the tip is formed on the inner surface side of the insertion portion 94 of the push nut 90, and a coil ring 56 is disposed so as to be sandwiched between the taper inner surface 98 and the fireproof packing 44. ing. As shown in FIG. 9, the coil ring 56 is formed by winding a spring steel wire (eg, outer diameter φ = 0.6 mm) into a coil shape and further forming a ring shape, and the diameter of the coil ring 56 is freely adjustable. At the same time, it is larger than the outer shape of the corrugate tube T in the unloaded state. Therefore, at the stage of inserting the corrugate tube T, the coil ring 56 can be smoothly inserted without being engaged with the peak portion T2 of the corgate tube T.

  Next, a procedure for connecting the corrugate pipe T to the plug-in type pipe joint 200 and its operation will be described in detail with reference to FIGS. 10 and 11.

  As shown in FIG. 10, when the corrugate pipe T is inserted into the plug-in-type pipe joint 200, the tip of the corgate pipe T comes into contact with the contact portion 740 a of the movable piece 740, and the movable piece 740 is the flange portion 760 of the ring body 720. The compression ring 700 is reduced in diameter. With the response and sound at this time, it can be recognized that the corrugate tube T has been inserted to a predetermined position of the plug-in type pipe joint 200.

  Then, as shown in FIG. 11, the collar ring 99 disposed between the joint body 80 and the push nut 90 is removed, and the push nut 90 is slid into the through hole portion of the joint body 80 and pushed. Then, the tapered inner surface 98 formed at the tip of the push nut 90 presses the coil ring 56 to reduce the diameter, and the coil ring 56 is engaged with the valley portion of the corrugate tube T.

Since the airtight packing 42 is an elastic member made of rubber, the seal surface pressure is maintained even if the corrugate tube T is slightly flattened or deformed, and is stable over a long period of time, following the shape of the outer peripheral surface of the corgate tube T. Sealing performance can be ensured.
Further, as shown in FIG. 11, the end of the push nut 90 can be pressed against the fireproof packing 44, and the airtight packing 42 can be compressed in the axial direction.

  Since the coil ring 56 has a relatively simple structure and is compact, the plug-in pipe joint 200 can be made inexpensive and the entire length of the plug-in pipe joint 200 can be shortened. Therefore, even when the plug-in type pipe joint 200 has to be installed in a narrow place, it can be simply installed simply by inserting the corrugate pipe T and sliding the push nut 90.

  When a force in the pulling direction is applied to the connected corgate pipe T, the coil ring 56 tends to move in the diameter reducing direction by the tapered inner surface 98 of the push nut 90, so that the valley of the coil ring 56 and the corrugate pipe T is connected. And the corrugate tube T is prevented from being pulled out.

  As described above, in the plug-in type pipe joint according to the present invention, the seal surface pressure is generated from the inside to the outside due to the press-fitting of the pipe in the thick portion of the seal member, and the compression ring is the seal member of the thin portion. Since the thin-walled portion is pressed in the direction of diameter reduction, the seal surface pressure that is flexibly contacted along the outer peripheral surface of the tube and is directed from the outside to the inside is improved. Therefore, even when the tube is somewhat flattened or deformed, a stable sealing performance can be maintained over a long period of time by adding a strong sealing property for the thick portion and a flexible sealing property for the thin portion. In the embodiment of FIGS. 1 to 11, the corrugate pipe has been described as an example. However, if it is a plug-in type pipe joint in which the pipe is inserted into and connected to the pipe joint, the configuration of the present invention can be effectively implemented. it can. The shape of the joint 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 the insertion type pipe joint of the present invention. It is a half sectional view of a state in the middle of inserting a corrugate pipe into the plug-in type pipe joint of the present invention. It is a perspective view of one Example of the compression ring in this invention. It is a half sectional view in the state where connection construction of the corrugate pipe is completed to the plug-in type pipe joint of the present invention. It is sectional drawing of the 2nd Example of the airtight packing in this invention. It is a perspective view of the 3rd example of a compression ring in the present invention. It is a half sectional view of the 3rd example of the insertion type pipe joint of the present invention. It is a half sectional view of the 4th example of the plug-in type pipe joint of the present invention. It is a perspective view of the 4th example of a retaining member in the present invention. It is a half sectional view in the state where a corrugate pipe was inserted in the 4th example of the plug-in type pipe joint of the present invention. It is a half sectional view of the state where connection construction of a corrugate pipe was completed to the 4th example of the plug-in type pipe joint of the present invention.

Explanation of symbols

1, 100, 200: Plug-in type pipe joint,
10: Joint body, 14: Male thread part, 15: Small diameter convex part, 16: Through hole part, 17: First locking groove, 18: Second locking groove, 19: Projection part,
20: nut member, 21: head portion, 22: insertion hole portion, 23: O-ring groove, 24: insertion portion, 25: locking groove, 26: vent hole, 28: tapered inner surface,
42, 420: Airtight packing (seal member), 42a: Thick part, 42b: Thin part, 42c: Ultrathin joint part, 44: Fireproof packing, 46: Guide, 47: Watertight O-ring, 48: Watertight packing,
50: Retainer (prevention member), 52: Claw part, 54: Tapered outer surface, 56: Coil ring (prevention member)
60: selectively permeable member, 61: stop ring, 63: ring for disassembly, 65: spacer, 67: spring,
70, 700: compression ring, 72, 720: ring main body, 72a, 720a: split part, 74, 740: movable piece, 74a, 740a: contact part, 74b, 740b: fitting part,
80: Joint body, 86: Through hole portion, 87: Tapered groove portion, 88a: First locking groove, 88b: Second locking groove,
90: push nut, 91: head portion, 94: insertion portion, 95: locking groove, 98: tapered inner surface, 99: coloring,
T: Colgate tube, T2: Mountain, T4: Valley, T6: Resin coating layer,

Claims (6)

In a plug-in type pipe joint having a joint main body having a through hole into which a pipe is inserted, a seal member disposed in the through hole, and a retaining member for preventing the pipe from coming out of the joint main body,
The seal member is disposed on the deeper side of the joint body than the retaining member, and has a thick portion that is in contact with the inner peripheral surface of the through hole, and an inner peripheral surface of the through hole that is connected to the thick portion. Has a thin part that does not contact
The thin portion is provided so as to be disposed on the back side of the joint body,
A plug-in type pipe joint, wherein a compression ring that presses the thin-walled portion in a diameter reducing direction is disposed on an outer periphery of the thin-walled portion.   The compression ring is provided with a movable piece that holds the compression ring in an expanded state, and when the pipe is inserted into the joint body, the tip of the pipe abuts on the movable piece and the movable piece 2. The plug-in type pipe joint according to claim 1, wherein the compression ring is reduced in diameter by being separated from the compression ring to compress the thin portion of the seal member.   The plug-in type pipe joint according to claim 2, wherein the movable piece includes a fitting portion to be fitted to the compression ring main body and a ring-shaped abutting portion to be brought into contact with the tip of the pipe. The tube is a corrugate tube having irregularities formed on the outer peripheral surface,
A nut member having one end inserted into the through hole and engaged with the joint body, and a tapered inner surface that expands toward the tip at the one end;
The retainer having a claw disposed at a tip of the nut member and engaging with a valley portion of the corrugate tube, and having a tapered outer surface on the back surface of the claw. The plug-in type fittings described.   5. The plug-in tube according to claim 4, wherein the retainer has a tapered outer surface biased to a tapered inner surface of the nut member by a spring having one end supported on the inner surface of the joint body. Fittings. The tube is a corrugate tube having irregularities formed on the outer peripheral surface,
A nut member having one end inserted into the through hole and slidably engaged with the joint body, and having a tapered inner surface whose diameter increases toward the tip at the one end;
The plug-in type pipe joint according to any one of claims 1 to 3, further comprising a diameter-reducing retaining ring that is disposed at a tip of the nut member and engages with a valley portion of the corrugate pipe.

Images