JP2019152296A - Coupling for resin pipe - Google Patents

Abstract

To provide a coupling for a resin pipe which permits sealing and slip-off prevention more reliably because a fastening ring 30 bites into a circumferential surface of the resin pipe 50.SOLUTION: A coupling for a resin pipe includes a coupling main body 10 provided with an annular part 11 for connection which has the inner circumferential side as a part 12 to be inserted and the outer circumferential side provided with a male screw part 17 in order to connect the resin pipe 50, an in-core 20 which is internally fitted to a tip part so as to expand a diameter of the tip part of the resin pipe 50 in a tapered shape, a fastening ring 30 which is provided with a tapered outer circumferential surface 31 having a diameter expanded toward a rear end direction from a tip so as to be abutted on a tapered inner circumferential surface 14 of the coupling main body 10 and a slit 32 of such a shape as to be cut-in from a rear end to a tip direction and a cap nut 40 which is screwed with the male screw part 17 of the coupling main body 10 and fastens the fastening ring 30. Therein, a band ring-shaped protruded seal part 33 formed so as to rise in a band ring-shape to the inner side is provided on an inner circumference of a tip part of the fastening ring 30.SELECTED DRAWING: Figure 1

Description

  In the present invention, in order to connect the resin tube, an inner peripheral side which is an insertion portion provided with a receiving step portion so that the tip of the resin tube is inserted and positioned, and a male screw portion are provided. A joint body provided with an annular portion for connection having an outer peripheral side, and a tapered inner peripheral surface provided with a taper inner peripheral surface that is reduced in diameter in the insertion direction from the insertion port on the insertion port side of the inserted portion; An in-core having a tapered outer periphery provided in a tapered shape that expands in diameter toward the base, and being fitted into the distal end so as to expand the distal end of the resin tube in a tapered shape; and the resin A tapered outer peripheral surface is provided that is formed in a ring shape so as to be fitted in the vicinity of the distal end of the pipe, and expands from the distal end toward the rear end so as to contact the tapered inner peripheral surface of the joint body. Tightening ring with slits cut from the rear end toward the front end And a cap nut for tightening the tightening ring so as to seal and prevent the resin pipe and the joint body from being screwed into the male screw portion of the joint main body so as to contain the tightening ring. It is related with a joint for resin pipes provided with.

  Conventionally, as a connection structure for a joint for a resin pipe that reliably prevents the resin pipe from coming off from the joint body, the end diameter-expanded pipe is engraved with a plurality of bamboo child-like stepped portions that the inner peripheral wall of the resin pipe bites into. And a flange protruding from the outer periphery of the pipe end of the taper. The outer diameter of the flange is such that the flange can be inserted into the joint body. It is set to be smaller than the inner diameter of the surface and larger than the inner diameter of the seal ring so that the end diameter-expanding tube does not come out of the seal ring. The one formed adjacent to a plurality of stages (see Patent Document 1) has been proposed.

JP 2009-79750 A (first page)

  The problem to be solved regarding the joint for resin pipes is that a more reasonable one has not been proposed for a configuration in which the tightening ring can more securely bite into the peripheral surface of the resin pipe and can be sealed and retained. is there.

  Accordingly, an object of the present invention is to provide a joint for resin pipes in which a tightening ring can more securely bite into the peripheral surface of the resin pipe and can be sealed and prevented from coming off.

The present invention has the following configuration in order to achieve the above object.
According to one form of the joint for resin pipes concerning the present invention, in order to connect a resin pipe, it is an inner circumference which is an insertion part provided with a receiving step part so that the tip of the resin pipe may be inserted and positioned A taper inner peripheral surface having a diameter that decreases in the insertion direction from the insertion port is provided on the insertion port side of the inserted portion. A joint body, and a tapered outer periphery provided on the outer peripheral side in a tapered shape that expands from the tip toward the root, and the tip of the resin tube expands in a tapered shape. An inner core that is fitted in the ring, and a ring shape that is fitted to the vicinity of the tip of the resin tube, and from the tip toward the rear end so as to come into contact with the tapered inner peripheral surface of the joint body A taper outer surface that expands in diameter and is cut in the axial direction from the rear end A fastening ring provided with a slit, and a male screw portion of the joint body so as to enclose the fastening ring, and sealing and retaining the resin tube and the joint body, In a joint for resin pipes including a cap nut for tightening the tightening ring, a band ring-shaped convex seal portion is formed on the inner periphery of the distal end portion of the tightening ring so as to rise in a band ring shape inward.

  Further, according to one aspect of the joint for resin pipes according to the present invention, an axially intermediate portion of the tightening ring and an inner circumference of a portion where the slit is provided so as to rise inward in a band arc shape. It can be characterized by including a formed band arc-shaped convex retaining portion.

  Moreover, according to one form of the joint for resin pipes concerning this invention, the ring-shaped step part is provided in the outer peripheral surface of the said in-core, It can be characterized by the above-mentioned.

  According to the joint for resin pipes concerning the present invention, there is an especially advantageous effect that the tightening ring can bite into the peripheral surface of the resin pipe more securely and can be sealed and retained.

It is sectional drawing which shows the example of a form of the joint for resin pipes concerning this invention. It is the perspective view seen from the front end side which shows the example of a clamp ring which is a component of the coupling for resin pipes concerning this invention. It is the perspective view seen from the rear end side which shows the example of the clamp ring which is a component of the coupling for resin pipes concerning this invention. It is sectional drawing which shows the other example of a coupling for resin pipes concerning this invention. It is the perspective view seen from the front end side which shows the example of an in-core which is a component of the joint for resin pipes concerning this invention.

  Hereinafter, the example of the form for the joint for resin pipes concerning the present invention is explained in detail based on an accompanying drawing (Drawings 1-5). The typical example of the resin pipe 50 connected by the joint for resin pipes concerning this invention comprises a water pipe, and requires a watertight seal. In addition, the joint for resin pipes concerning this invention is not limited to what is utilized as liquids, such as water, It can be utilized for the connection of the fluid pipeline including the case where a gas seal is required. Is.

  10 is a joint body, and in order to connect the resin pipe 50, the inner peripheral side which is the inserted part 12 provided with the receiving step part 16 so that the tip of the resin pipe 50 is inserted and positioned; and A tapered inner peripheral surface 14 having a connecting annular portion 11 having an outer peripheral side provided with a male screw portion 17 and having a diameter reduced from the insertion port 13 toward the insertion direction on the insertion port 13 side of the inserted portion 12. Is provided. The receiving step portion 16 of the present embodiment is a circular inner step formed by reducing the diameter in a step shape at a required insertion depth position inside the cylindrical shape. However, the present invention is not limited to this, and it is sufficient that the resin tube 50 functions as a stopper so that the resin tube 50 is inserted at an appropriate depth.

  Further, in this embodiment, a parallel portion 15 (cylindrical inner peripheral surface) that is not tapered gradually decreases in diameter in the depth direction continuous to the tapered inner peripheral surface 14 of the inserted portion 12. Is provided. As a result, the distal end portion of the resin tube 50 is appropriately inserted and positioned. Further, in this embodiment, an outer shape portion 18 such as a hexagonal shape into which a tool such as a spanner is fitted is formed on the back side in the insertion direction of the male screw portion 17.

  In addition, in the present embodiment, the configuration in which the inner peripheral side is a flow path and the outer peripheral side is a male screw portion 19 for connection is continuous with the connection annular portion 11 of the joint body 10. Of course, it may be in various forms. For example, it may have a female screw portion for connection on the inner peripheral side, or an elbow-shaped or T-shaped flow path is continuously formed from the connection annular portion 11 and connected to the tip A screw or other connection form may be provided.

  Reference numeral 20 denotes an in-core, which has a tapered outer peripheral portion 21 provided in a tapered shape whose diameter increases toward the root portion on the outer peripheral side, and the distal end portion of the resin pipe 50 is expanded in a tapered shape. It is provided so that it may be fitted inside. The tapered shape of the tapered outer peripheral portion 21 is any of a stepped form such as a ring-shaped concave portion (including a groove shape) or a ring-shaped convex portion in addition to a shape in which the diameter gradually and gradually increases. By including one or a combination thereof, it is meant to include a form in which the diameter is gradually increased.

  Reference numeral 30 denotes a tightening ring which is formed in a ring shape so as to be fitted in the vicinity of the front end of the resin tube 50, and is directed from the front end toward the rear end so as to come into contact with the tapered inner peripheral surface 14 of the joint body 10. A tapered outer peripheral surface 31 that expands in diameter is provided, and a slit 32 that is cut from the rear end toward the front end is provided. In this embodiment, as shown in FIG. 2 or 3, four slits 32 are formed at circumferentially equal positions, but the number is not limited to this embodiment. It can be appropriately set according to the size of the resin tube 50 and the like.

  Reference numeral 40 denotes a cap nut, and a female screw portion 42 is screwed into the male screw portion 17 of the joint body 10 so as to enclose the tightening ring 30, and the resin tube 50 and the joint body 10 are sealed and prevented from coming off. Thus, the fastening ring 30 is provided to be fastened. Further, in the cap nut 40 of the present embodiment, a portion in contact with the rear end of the tightening ring 30 is formed with an inclined surface 41 of an inner surface that gradually expands in the tightening direction, and the cap nut 40 is tightened. When displaced in the axial direction, the inclined surface 41 on the inner surface presses the fastening ring 30 and tightens it in the insertion direction of the resin tube 50. In correspondence with the inclined surface 41 of the inner surface, a rear-end inclined surface 35 is formed which gradually increases the diameter of the rear end of the tightening ring 30 in the tightening direction.

  In the joint for resin pipes according to the present invention, the band ring-shaped convex seal portion 33 is formed on the inner periphery of the distal end portion of the tightening ring 30 so as to rise in a band ring shape inward. The band ring-shaped convex seal portion 33 of the present embodiment is a circular ring formed centering on the shaft center, and has a shape that rises in a rectangular cross section, and includes a band-shaped seal surface having a predetermined width from the tip. It is in form.

  According to this, the tightening ring can bite into the outer peripheral surface of the resin tube 50 more reliably, and can perform sealing and retaining. That is, since the entire inner peripheral surface on the front end side of the tightening ring 30 is close to a line seal having a small seal area, the tightening force can be concentrated appropriately. It has become. Therefore, the effects of both sealing and retaining can be enhanced. For this reason, earthquake resistance can also be improved.

  Further, in the resin pipe joint of the present embodiment, a band formed so as to rise inward in a band arc shape on the inner periphery of the portion in the axial direction of the fastening ring 30 where the slit 32 is provided. An arcuate convex stopper 34 is provided. The band arc-shaped convex slip-off preventing portion 34 of the present embodiment has a plurality of arc shapes formed by dividing the circular ring shape formed around the axis by the slits 32, At the position away from the rear end of the tightening ring 30 in the tightening direction by a required depth, a convex shape projecting inward is provided.

  According to this, the belt arc-shaped convex retaining portion 34 is closer to a line contact with a smaller retaining area than when the entire inner peripheral surface of the tightening ring 30 is a retaining surface. Since it is in a form, it has a form in which the tightening force can be concentrated moderately. Therefore, the effect of retaining can be enhanced and the earthquake resistance can be enhanced.

  And since this belt | arc arc-shaped convex slip-off prevention part 34 is provided in the middle part of the depth direction of the slit 32, it becomes an action point of an insulator and the root part of the circular-arc side peripheral wall in which the slit 32 was formed becomes , Become a fulcrum. Further, it is pressed by the cap nut 40 and is tightened in the insertion direction of the pipe joint 50, and a pressing force is received inward by the inclined surface 41 of the inner surface of the cap nut 40 and / or the inclined surface 35 of the rear end of the tightening ring 30. The rear end of the tightening ring 30 is a power point. According to this, the force for tightening the rear end of the tightening ring 30 effectively acts on the principle of the lever, and the belt-arc-shaped convex slip-off preventing portion 34 securely bites into the outer peripheral surface of the pipe joint 50, and comes off. The effect of stopping can be enhanced.

  Further, in the joint for resin pipe of the embodiment shown in FIG. 4, a ring-shaped step portion 22 is provided on the outer peripheral surface of the in-core 20. In the present embodiment, two ring-shaped step portions 22 are formed in a concave groove shape in the middle of the axial direction on the outer peripheral surface of the in-core 20. As shown in FIGS. 4 and 5, the in-core 20 is formed of a metal material, and protrudes outward from the enlarged root portion of the tapered outer peripheral portion 21 in a direction perpendicular to the axial center line. Is provided with a flange 23 formed in a circular flange shape.

  According to this, by tightening, the inner peripheral surface of the resin pipe 50 is pressed against the ring-shaped step portion 22 and bites into it, thereby enhancing the retaining effect. And as shown in FIG. 4, a seal | sticker and drop-off prevention can be heightened by a synergistic effect by using together with the form of the above-mentioned clamping ring 30. FIG. Further, according to the flange portion 23, when the in-core 20 is inserted into the resin tube 50, it is possible to prevent excessive deformation and deformation of the end portion of the resin tube 50 so that the end portion of the in-core 20 is sunk.

  Further, the present invention has been described in various ways with preferred embodiments. However, the present invention is not limited to the above embodiments, and many modifications can be made without departing from the spirit of the invention. Of course.

DESCRIPTION OF SYMBOLS 10 Joint main body 11 Connection annular part 12 Inserted part 13 Insertion port 14 Tapered inner peripheral surface 15 Parallel part 16 Receiving step part 17 Male screw part 18 External part 19 Male screw part 20 for connection Incore 21 Tapered outer peripheral part 22 Ring Shaped step portion 23 flange portion 30 tightening ring 31 taper outer peripheral surface 32 slit 33 band ring-shaped convex sealing portion 34 band arc-shaped convex retaining portion 35 rear end inclined surface 40 cap nut 41 inner inclined surface 42 female screw portion 50 Resin pipe

The present invention has the following configuration in order to achieve the above object.
According to one form of the joint for resin pipes concerning the present invention, in order to connect a resin pipe, it is an inner circumference which is an insertion part provided with a receiving step part so that the tip of the resin pipe may be inserted and positioned A taper inner peripheral surface having a diameter that decreases in the insertion direction from the insertion port is provided on the insertion port side of the inserted portion. A joint body, and a tapered outer periphery provided on the outer peripheral side in a tapered shape that expands from the tip toward the root, and the tip of the resin tube expands in a tapered shape. An inner core that is fitted in the ring, and a ring shape that is fitted to the vicinity of the tip of the resin tube, and from the tip toward the rear end so as to come into contact with the tapered inner peripheral surface of the joint body A tapered outer peripheral surface that expands in diameter is provided, and cut from the rear end toward the front end. A fastening ring provided with a slit and a male screw part of the joint body so as to enclose the fastening ring, and sealing and retaining the resin tube and the joint body In the joint for resin pipes comprising a cap nut for tightening the tightening ring, the inner periphery of the distal end portion of the tightening ring is provided with a band ring-shaped convex seal portion formed so as to rise in the shape of a band ring inward . A band arc shape formed so as to rise inward in a band arc shape on the inner circumference of the slit in the midway part in the depth direction of the slit in the axially middle part of the tightening ring Provided with a convex stopper.

Further, according to one aspect of the joint for resin pipes according to the present invention, the band ring-shaped convex seal part and the band arc-shaped convex slip-off preventing part bite into the outer peripheral surface of the resin pipe to seal and prevent slip-off. As it does, it can be characterized by having a strip-shaped sealing surface with a predetermined width .

Claims (3)

In order to connect the resin tube, the resin tube has an inner peripheral side which is an inserted portion provided with a receiving step portion so that the tip of the resin tube is inserted and positioned, and an outer peripheral side provided with a male screw portion. A joint body provided with an annular part for connection, and provided with a tapered inner peripheral surface that is reduced in diameter toward the insertion direction from the insertion port on the side of the insertion port of the inserted portion;
The outer peripheral side has a tapered outer peripheral portion provided in a tapered shape whose diameter increases from the distal end toward the root portion, and is fitted into the distal end portion so as to expand the distal end portion of the resin pipe in a tapered shape. Incore,
A tapered outer peripheral surface that is formed in a ring shape so as to be fitted around the front end of the resin tube and expands from the front end toward the rear end so as to contact the tapered inner peripheral surface of the joint body is provided. And a tightening ring provided with a slit having a shape cut from the rear end toward the front end,
A cap nut that is screwed into a male screw portion of the joint body so as to enclose the fastening ring, and that tightens the fastening ring so as to seal and prevent the resin pipe and the joint body from coming off. In joints for resin pipes,
A joint for a resin pipe, comprising a band ring-shaped convex seal portion formed so as to rise inward in a band ring shape on an inner periphery of a tip portion of the tightening ring.   A band arc-shaped convex slip-off preventing portion formed so as to rise inward in a band arc shape is provided on the inner periphery of the portion in the axial direction of the tightening ring where the slit is provided. The joint for resin pipes of Claim 1.   The joint for resin pipes according to claim 1 or 2, wherein a ring-shaped step portion is provided on an outer peripheral surface of the in-core.

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