JPH10185069A - Connecting member of plastic pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting member in which the part items management is simple, a worker never mistakes the order to install parts, and a plastic pipe hardly rotates together, when the outer peripheral surface at the end of the plastic pipe is fastened by a nut through a presser ring. SOLUTION: This connecting member of plastic pipe consists of a coupling main body 1 made by forming a female screw engraving part 23 and an inner core 4 in order, on one side of a collar 2; a split ring 10 to cover a plastic pipe which is installed on the outer peripheral surface of the inner core 4 from the outer side; and a box nut inserting the split ring 10 to its inner side. In this case, the split ring 10 presents a cylindrical form shorter than the depth of the box part of the box nut 20, its one side end is made thinner as going to the front end, while an end part projection ring projecting to the outer side is provided to the other side end side. Furthermore, the box nut 20 furnishes a clearance which is made to insert the end part projection ring of the split ring 10 loosely, at the bottom side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a connecting member for a plastic pipe. More specifically, when connecting the joint body and the plastic tube, the parts are hard to be lost, there is no risk of mistaking the order and direction of mounting the parts, and the plastic pipe rotates together when rotating the tightening nut. Difficult plastic pipe (also called plastic conduit)
Connection member.

In recent years, pipes for hot and cold water supply in general houses, apartment houses, commercial buildings, hotels, etc., and pipes for a heating medium for floor heating of houses, etc., have recently been used for corrosion resistance, earthquake resistance, sanitation, workability, etc. In view of this, plastic conduits (hereinafter referred to as "plastic tubes") have become widespread. When connecting these plastic tubes and equipment, joints are always arranged between them. Conventionally, this type of joint is, for example, J
As described in IS B2354, a method in which an inner core portion is provided on one side of a joint main body, and an outer peripheral surface of an end portion of a plastic pipe externally fitted to this portion is tightened with a nut via a holding ring. Was known.

[0003]

Based on these conventional methods, three parts required for tightening the outer peripheral surface of the end of the plastic pipe are a joint body, a holding ring, and a nut.
Even if there are only three points, not only the management of parts is complicated but also the connection work is unavoidable, and the operator often mistakes the order of mounting parts and the mounting direction, There was a disadvantage that the connection work efficiency was poor. Further, when the outer peripheral surface of the end portion of the plastic tube is tightened by a nut via a holding ring, the plastic tube corotates and twists, and in some cases, the plastic tube is damaged.

Under these circumstances, the present inventors have conducted intensive studies to provide a connecting member for a plastic pipe which eliminates the disadvantages of the conventional method, and as a result, have completed the present invention. The objects of the invention are as follows. 1. Provided is a plastic pipe connecting member that is easy to manage parts and does not confuse the order in which workers mount parts. 2. To provide a connecting member in which the plastic tube is unlikely to rotate together when the outer peripheral surface of the end of the plastic tube is fastened by a nut via a holding ring.

[0005]

In order to solve the above-mentioned problems, according to the present invention, there is provided a joint body and an inner core portion in which a male screw engraved portion on one side of a flange portion and an inner core portion are sequentially formed. In a connecting member for a plastic pipe consisting of a split ring for covering a plastic pipe having a plastic pipe externally fitted on an outer peripheral surface thereof and a cap nut for inserting the split ring inside the split ring, the split ring has one end side. Is thinned toward the tip, a protruding end convex ring is provided on the other end side, and a cap nut is provided with a female screw engraved part near the joint body and a joint body. And a gap portion in which a female screw is not engraved is provided in a portion far away, and an end convex ring of the split ring is loosely fitted in the gap portion. Plastic tube connection members To provide.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The connection member of the plastic pipe according to the present invention is a joint body,
It is composed of three parts, a split ring and a cap nut. The joint main body has a male screw engraved portion and an inner core portion sequentially formed on one side of a flange portion. The inner core part
It has the function of externally fitting the plastic tube to its outer peripheral surface, and the male screw of the male screw engraved part is screwed with the female screw of the female screw engraved part of the cap nut, and when the screwing of both is completed, The split ring covering the outer surface of the end of the plastic tube is pressed toward the flange of the joint body, and the end of the plastic tube is firmly fixed to the outer peripheral surface of the inner core.

[0007] The structure of the pipe joint on the opposite side of the inner core from the flange is not particularly limited, and may be directly attached to the header, such as a male screw, a female screw, or a union. They may be joined. The shape of the flange may be circular or polygonal such as hexagonal, and is selected according to the place where the joint body is used. The outer diameter of the flange portion is larger than the maximum diameter of the inner core portion, and can be selected within a range that can achieve the object of the present invention.

In the joint body, an annular groove (annular groove) is formed along the inner wall surface of the inner core portion in a thick portion sandwiched between the inner wall surface of the inner core portion and the male screw engraved portion. preferable. By inserting both the end of the plastic pipe and the thinned tip of the split ring into this annular groove, the plastic thread is used to screw the female screw of the cap nut into the male screw of the joint body. It is possible to effectively prevent the tubes from rotating together. The inner diameter of the annular groove is the same as the outer diameter of the inner core, the outer diameter is such that the end of the plastic pipe can be fitted, the depth is almost equal to the thickness of the plastic pipe, and the annular groove widens toward the opening. An inclined surface is provided. The depth of the annular groove is preferably set to a position beyond the portion corresponding to the male screw engraved portion and reaching the vicinity of the flange.

The outer peripheral surface of the inner core portion may be a cylindrical surface having no irregularities, but it is preferable that a plurality of irregularities are formed. The uneven portion is engraved in an annular shape along the outer peripheral surface, and when cut in the length direction so as to pass through the axis of the joint body, a plurality of trapezoidal tops appearing on the outer peripheral surface of the inner core portion (A convex ring) and a concave portion (a concave ring) formed by the adjacent convex portions (a convex ring).

The height of the convex portion and the depth of the concave portion can be selected according to the length, thickness, diameter of the outer peripheral surface and the like of the inner core portion. The number of convex portions varies depending on the length, diameter, and the like of the inner core portion, but is selected in the range of 1 to 4. Further, it is preferable that the concave portion formed on the outer peripheral surface of the inner core portion correspond to a convex ring formed on the inner peripheral surface of the split ring, which will be described later. Serves to ensure fixation. The number of recesses varies depending on the length, diameter, etc. of the inner core,
It is selected in the range of 1 to 4.

The split ring has a short cylindrical shape and is provided with cuts along the length of the cylinder. One end is made thinner toward the tip, and the other end is made thinner. A structure is provided in which an end convex ring protruding outward is provided.
The length of the split ring may be such that when inserted into the cap nut, the entire length of the split ring completely enters the cap nut, or may be a length protruding from the cap nut. The inner diameter of the split ring is equal to or slightly larger than the outer shape of the plastic pipe when the split ring is released (the interval between the cuts of the split ring is maximized), and the outer diameter is the female thread engraved part of the cap nut. Or no contact with the thread crest.

After the split ring is loosely fitted into the cap nut with the split ring released, the convex ring at the end of the split ring loosely fitted into the gap portion of the cap nut is formed by the thread of the female screw engraving portion. It is prevented from coming off the outside of the cap nut. When inserting the split ring into the cap nut, reduce the outer diameter of the split ring (reduce the interval between cuts in the split ring), and set the convex ring at the end of the split ring to cut the female screw of the cap nut. What is necessary is just to make it not to contact the thread crest of an installation part.

The outer peripheral surface of the split ring is a surface having no unevenness between the end convex ring and the thinned portion toward the tip. The inner wall surface of the split ring may be a surface without irregularities, but it is preferable to provide a plurality of inwardly projecting inner peripheral surface convex rings at positions corresponding to the concave portions of the inner core portion. The convex ring on the inner peripheral surface may be a ring extending over the entire inner peripheral surface of the split ring, or may be a ring formed at regular intervals in a dotted or linear shape. It is preferable that the width and height of the inner peripheral surface convex ring be smaller than the concave portions formed on the outer peripheral surface of the inner core portion. Normally, the split ring is inserted into the space of the cap nut, the convex ring at the end is loosely fitted into the gap of the cap nut, stored and transported, and used as it is when joining plastic pipes To be served.

The cap nut is provided with a female screw on one of the large-diameter openings, and has a size such that it can be accurately screwed into the male screw-cut portion of the joint body, and the opening on the opposite side is equivalent to the outer shape of the plastic pipe. Of smaller diameter. Between the inner end of the female screw engraved portion of the cap nut and the small-diameter opening, the female screw for loosely fitting the end convex ring on the outer peripheral surface of the split ring has a maximum diameter not engraved. A void portion is provided. The gap portion is provided with an inclined portion whose inner diameter is gradually reduced from the maximum diameter portion toward the small diameter opening. When the female screw of the cap nut is screwed into the male screw of the joint body, the inclined portion pushes the split ring toward the flange of the joint body and moves the split ring while reducing the diameter of the split ring.

When the female screw of the cap nut is screwed into the male screw of the joint main body, the convex ring at the end of the outer peripheral surface of the split ring slides on the inclined surface of the cap nut, and the diameter of the split ring is reduced. You. The contact between the cap nut and the split ring is limited to only the inclined portion of the cap nut and the convex ring at the end of the split ring, and the contact area between the two is small, so when the cap nut is rotated and screwed into the male screw of the joint body, The split ring immediately contacts the plastic tube and does not rotate with the cap nut.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The joining member according to the present invention will be described below in detail with reference to the drawings, but the present invention is not limited to the following description unless it exceeds the gist.

FIG. 1 is a partially cutaway side view before assembling a joining member according to the present invention, and FIG. 2 is a partially cutaway side view showing a state in which a split ring is fitted to a cap nut. 3 shows a partially cutaway side view of a state where the plastic pipe is joined by the joining member according to the present invention.

The joint body 1 is provided with a male thread engraving part 3, an inner core part 4, and a pipe joint part 5 provided on the other side of the flange part 2 with the flange part 2 interposed therebetween. In the figure, an example is shown in which an annular groove 6 provided in a thick portion sandwiched between an inner wall surface portion of an inner core portion and a male screw engraving portion is provided.
This annular groove 6 may not be provided. When the annular groove 6 is provided, it is preferable to form the inclined surface 7 on the opening side. In the drawing, the depth of the annular groove 6 exceeds the male screw
Although the example reaching the side is shown, the present invention is not limited to this example, and may be shallower than the illustrated example. The outer periphery of the inner core portion 4 may not be provided with irregularities, but the figure shows an example in which two convex portions 8 and two concave portions 9 are provided.

The split ring 10 has a short cylindrical shape, and is provided with a cut along the length of the cylinder. An end protruding ring 12 protruding outward is provided on the part side. No irregularities are provided on the outer circumference between the portion 11 and the end convex ring 12 which are made thinner toward the tip. If the split ring 10 is slightly cut off at the inner corner side of the end convex ring 12, it is convenient when inserting a plastic tube. The unevenness may not be provided on the inner peripheral surface of the split ring 10, but the figure shows an example in which two inner peripheral convex rings 13 are provided. In a state where the plastic pipe is joined by the joining member, the inner peripheral surface convex ring 13 is provided at a position facing the concave portion 9 provided on the outer peripheral surface of the inner core portion.

The cap nut 20 is provided with a large-diameter opening 21 on one side and a small-diameter opening 22 on the other.
1, a female screw engraving portion 23 is provided, and a female screw that can be screwed into a male screw is engraved. A void portion 24 having a maximum diameter portion where no female screw is provided is formed from the inner end of the female screw engraving portion 23. The maximum diameter portion has a depth at which the end convex ring 12 of the split ring 10 can be loosely fitted, and an inclined surface 25 is formed in the small diameter opening 22 from the depth of the maximum diameter portion.

In order to join the plastic pipes by the joining member according to the present invention, the plastic pipes 30 are inserted inside the split ring 10 assembled as shown in FIG. 6 and the female screw of the cap nut 20 is screwed into the male screw of the joint body. The split ring 10 has an end convex ring 12 formed by the inclined portion 2 of the cap nut 20.
5 is pushed toward the joint main body side, and the thinned portion 11 is pushed into the annular groove 6 while sliding on the inclined surface 7 of the annular groove toward the tip, the diameter of which is reduced, and The pipe 30 is pressed from the outer peripheral surface to the outer peripheral surface of the inner core portion.

[0022]

As described above, the present invention has the following particularly advantageous effects, and its industrial value is extremely large. 1. Inserting the split ring into the space of the cap nut, loosely fitting the end convex ring to the gap of the cap nut, storing and transporting it, it will be used as it is when performing the joining work, The parts management is easy, and even if the worker is unskilled, the joining direction and the mounting order of the parts are not mistaken, and the joining operation can be performed safely and efficiently. 2. Since the outer peripheral surface of the tube end of the plastic tube is tightened by the nut via the holding ring, the plastic tube does not rotate together when the nut is screwed.

[Brief description of the drawings]

FIG. 1 shows a partially cutaway side view before assembling a joining member according to the present invention.

FIG. 2 is a partially cutaway side view showing a state in which a split ring is fitted to a cap nut.

FIG. 3 is a partially cutaway side view showing a state where a plastic pipe is joined by a joining member according to the present invention.

[Explanation of symbols]

 1: Joint body 2: Flange 3: Male screw engraved part 4: Inner core part 5: Piping joint part 6: Annular groove 7: Inclined surface 8: Convex part 9: Concave part 10: Split ring 11: As it comes to the tip Thinned part 12: End convex ring 13: Inner peripheral convex ring 20: Cap nut 21: Large diameter opening 22: Small diameter opening 23: Female screw engraved part 24: Void part 25: Inclined surface 30: plastic tube

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshio Hashioka 2040 Nagasaka-Kamijo, Nagasaka-cho, Nagakoma-gun, Yamanashi Prefecture Inside Kitz Co., Ltd.

Claims (3)

[Claims] 1. A joint body in which a male thread engraved portion on one side of a flange portion and an inner core portion are sequentially formed, and a split ring for covering a plastic tube having a plastic tube externally fitted on the outer peripheral surface of the inner core portion. And a connecting member for a plastic pipe comprising a cap nut for inserting the split ring inside thereof, the split ring is formed such that one end is made thinner toward the tip and the other end is made thinner. An outer end of the cap nut is provided with a convex ring, and the cap nut is provided with a female screw engraved portion near the joint body and a void portion where the female screw is not engraved at a portion far from the joint body. A connecting member for a plastic pipe, characterized in that a convex ring at the end of the split ring is loosely fitted in a gap portion. 2. The joint body has a thick wall portion sandwiched between an inner wall surface portion of the inner core portion and a male screw engraved portion.
The connecting member for a plastic pipe according to claim 1, wherein an annular groove is formed to fit an end of the plastic pipe and a thinned distal end of the split ring. 3. The inner core portion has a plurality of concavities and convexities formed on the outer peripheral surface thereof, and a plurality of inwardly projecting portions on the inner peripheral surface of the split ring corresponding to the concave portions of the inner core portion. The connecting member for a plastic pipe according to claim 1, wherein an inner peripheral surface convex ring is provided.