JPH058183U - Coupling device for plastic tubes - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the sliding resistance during tightening operation and to facilitate the connection. [Structure] A tightening ring 6 which can be fitted to the split ring 5 to tighten the split ring 5 so that a plastic pipe p can be sandwiched between the inner core portion 4 and the split ring 5 of the joint main body 1, and a joint main body. A nut 7 that can be screwed into the male screw tube portion 3 of No. 1 is provided, and at least one flat surface portion 6a, which is a joint surface between the split ring 5 and the tightening ring 6, is provided with a coating layer 6d made of a fluorine-based resin. The sliding resistance between the tightening ring 6 and the split ring 5, which slide by the screwing operation of 7, can be reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a joint device used for connecting a plastic pipe to a fluid supply port for hot water or the like.

[0002]

[Prior Art]

 As a joint device for connecting a plastic pipe to a fluid supply port such as hot and cold water, as shown in FIG. 5 of the accompanying drawings, a joint main body 11 in which an inner core portion 12 is integrally projected, and the inner core portion 12 are provided. The split ring 13 is fitted on the inner core portion 12 so that the plastic pipe p can be fitted between the split ring 13 and the tightening ring 14 slidably fitted on the split ring 13. 13 is provided with a locking portion 13a that locks with the locking portion 12a provided on the inner core portion 12, while the outer peripheral surface of the split ring 13 is tapered so that the locking portion 13a side gradually becomes smaller in diameter. There is known a structure in which the plastic ring p can be connected to the joint body 11 by being formed on the surface portion 13b, and the split ring 13 can be tightened by the tightening ring 14 (actually developed shokai). See Japanese Unexamined Patent Publication No. 3-125281).

In FIG. 5, 13 c is a flange portion provided on the split ring 13, 15 is a notch portion provided on the outer peripheral surface of the inner core portion 12, and 16 is a ridge portion provided on the inner peripheral surface of the split ring 13. Is.

[0004]

[Problems to be solved by the device]

 In the conventional joint device shown in FIG. 5, since the inner core portion 12 and the split ring 13 are locked by the locking portions 12a, 13a provided on both sides, the split ring 13 is attached to the inner core portion 12. It requires a considerable amount of skill in the operation of fitting, and since the tightening ring 14 is slid to tighten the split ring 13, the tightening ring 14 slides on the tapered surface portion 13b of the split ring 13. In the initial stage of the moving tightening operation (shown in phantom in FIG. 5), the tightening ring 14 is prone to incline, and the tightening force on the split ring 13 lacks uniformity.

Furthermore, the adhesion between the inner core portion 12 and the inner wall of the plastic pipe p is poor, and there is a problem that water leakage may occur.

The present invention solves the above problems, and an object of the present invention is to provide a joint without providing an engaging portion for locking the inner core portion and the split ring between the inner core portion and the split ring. The split nut is screwed onto the main body and the tightening ring slides.The tightening ring is crimped to the split ring, the split ring can be tightened to easily connect the plastic pipe, and the tightening force on the split ring can be made uniform. Another object of the present invention is to provide an improved plastic pipe joint device capable of firmly adhering the inner core portion and the split ring to the plastic pipe.

Another object is to eliminate the problem that the plastic pipe is unduly twisted at the time of connection work, and at the same time improve the sliding resistance at the time of tightening operation between the split ring and the tightening ring. It is to provide a joint device for a plastic pipe.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a plastic pipe joint device, which is a feature of the present invention, comprises a joint body in which an inner core portion is integrally projectingly provided on a male screw pipe portion on the side where the plastic pipe is connected, and the inner core. With a joint device for a plastic pipe provided with a split ring fitted on the inner core portion so that a plastic pipe can be fitted between the split pipe and a tightening ring slidably fitted on the split ring. The inner core part has a plurality of notches for locking that are inclined along the axial direction of the inner core part, and the split ring has a split ring formed by a tightening ring on the inner peripheral surface. When the tightening is completed, each ridge is provided so as to face the valley of the above-mentioned notch, and the outer peripheral surface on the rear end side of the split ring is a tapered surface that gradually decreases in diameter toward the tip. The inner peripheral surface on the rear end side of the tightening ring is formed on the tapered surface so as to correspond to the tapered surface, while the male screw pipe of the joint body has a rear end port on the rear end of the tightening ring. A nut formed on the flange that abuts the peripheral edge of the part is screwed, and at least a flat surface portion of the outer peripheral surface of the split ring and / or at least a flat surface portion of the inner peripheral surface of the tightening ring is covered with a fluorine resin coating Is provided.

[0009]

[Action]

 When the tightening ring is slid by the nut screwed to the male threaded pipe part, the split ring is tightened by the sliding action of this tightening ring, and the plastic pipe can be tightened and connected between the inner core part and the split ring. .. Then, since the notch of the inner core part and the ridge of the split ring bite into the inner and outer wall parts of the plastic pipe, respectively, the split ring and the tightening ring are fixed on the inner core part together with the plastic pipe, and the close connection state Is firmly established. In addition, since a coating layer made of a fluorine-based resin is present on the joint surface portion of the split ring and the tightening ring, sliding resistance during tightening operation is reduced and smooth connection work can be achieved.

[0010]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3, a joint body generally designated by reference numeral 1 is provided with a male screw pipe 2 connected to a fluid supply port side and a male screw pipe portion 3 connecting a plastic pipe p in communication with each other. At the mouth end portion 3a of the male pipe portion 3, an inner core portion 4 into which the plastic pipe p is inserted is provided so as to integrally project.

On the outer peripheral surface of the inner core portion 4, a plurality of notches 4a for locking which are inclined along the axial direction are engraved, and on the inner core portion 4, the inner core portion 4 is formed. A split ring 5 is fitted in the housing 4 with a gap into which the plastic pipe p can be inserted, and a split portion 5a is provided in a state of being slightly inclined with respect to the axial direction. The outer peripheral surface of the split ring 5 on the rear end side is formed into a tapered surface portion 5b which is gradually inclined toward the tip so as to have a smaller diameter, and the inner peripheral surface of the split ring 5 has a tightening ring 6 to be described later. A ridge portion 5c is provided so as to face the valley portion 4b of the notched portion 4a when the tightening of the split ring 5 by the above is completed.

The tightening ring 6 is slidably fitted on the split ring 5, and the inner peripheral surface of the tightening ring 6 corresponds to the flat surface portion 5d of the outer peripheral surface of the split ring 5, and the flat surface portion 5d. Is formed on the flat surface portion 6a having an inner diameter substantially the same as the outer diameter (the diameter after tightening) and the tapered surface portion 6b corresponding to the tapered surface portion 5b of the split ring 5. Further, the rear end peripheral edge 6c of the tightening ring 6 is preferably formed in an arc shape or a pointed shape, so that when the nut 7 described later is screwed into the male screw pipe portion 3 and rotated. In addition, the nut 7 and the rear end peripheral edge 6c of the tightening ring 6 come into line contact with each other to reduce friction and prevent twisting of the plastic pipe p during connection work.

A coating layer 6d made of a fluororesin (eg, Teflon) is provided on the inner peripheral surface of the fastening ring 6, and the coating layer 6d is provided on at least the flat surface portion 6a of the inner circumferential surface of the fastening ring 6. The thickness is about 1 to 100 μm. The fluorocarbon resin coating layer may be provided only on one of the split ring 5 and the tightening ring 6. In FIG. 4, the fluorocarbon resin coating layer 5e is provided on at least the flat surface portion 5d of the outer circumferential surface of the split ring. An example is given.

The nut 7 that is screwed into the male threaded pipe portion 3 has a rear end opening formed on an inwardly facing flange portion 7a, and the rear end peripheral edge 6c of the tightening ring 6 is brought into contact with the flange portion 7a, so that the nut When the tightening ring 6 is slid by the screwing operation of 7, the split ring 5 is tightened, and the plastic pipe p is sandwiched between the inner core portion 4 and the split ring 5 to complete the connection. If the nut 7 is a split nut (shown in the figure) provided with a split 7b having a width at least larger than the outer diameter of the plastic pipe p inserted into the inner core portion 4, the nut 7 is removed after the connection is completed. It is possible to use this nut 7 for other similar connection work, and at the time of connection work, visually check the inserted state of the plastic pipe p through the crack 5a of the split ring 5 and the split 7b of the nut 7. It is possible and convenient for performing the connection work properly.

[0015]

[Effect of the device]

 The present invention is as described above, and the split ring can be easily mounted, and the plastic pipe can be easily connected by screwing the split nut to the male screw pipe portion. Since the ridges of (1) come into close contact with the plastic pipe in the state of facing the troughs of the notched portion of the inner core, the sealing action between these members is strong, and it is particularly excellent in terms of preventing water leakage. In addition, since a coating layer made of a fluororesin is present on the contact surface portion between the split ring and the tightening ring, the sliding resistance at the time of tightening operation is reduced, and smooth connection work can be achieved.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of the present invention in a connection completed state.

FIG. 2 is an exploded perspective view of constituent members in FIG.

FIG. 3 is an enlarged front sectional view of the tightening ring in FIG.

4 is an enlarged cross-sectional view showing a modified example of the split ring in FIG.

FIG. 5 is a front sectional view showing a conventional joint device.

[Explanation of symbols]

Reference numeral 1 is a joint body, 3 is a male screw pipe portion, 3a is a mouth end portion, 4 is an inner core portion, 4a is a cut portion, 4b is a valley portion, 5 is a split ring, 5a is a cracked portion, 5b is a tapered surface portion, 5c. Is a ridge portion, 5d is a flat surface portion, 5e is a coating layer, 6 is a tightening ring, 6a is a flat surface portion, 6b is a tapered surface portion, 6c is a rear end peripheral edge, 6d is a coating layer, 7 is a nut, and 7a is a collar portion. , P is a plastic tube.

Front page continued (72) Inventor Takashi Kureha 1-12-3 Shibaura, Minato-ku, Tokyo Within Ryowa Sansan Co., Ltd. (72) Inventor Noriaki Hattori 8-3 Chuo 8-chome, Ami-machi, Inashiki-gun, Ibaraki Inside Product Research Institute, Wanshi Co., Ltd. (72) Inventor Satoshi Fujii 4-13 Aioi-cho, Itabashi-ku, Tokyo Inside Chiyoda Manufacturing Co., Ltd. (72) Inventor Kazuhiro Sueyoshi 1-20-5 Chiyoda, Yotsukaido, Chiba

Claims (1)

[Claims for utility model registration] [Claim 1] A plastic pipe is provided between a joint body in which an inner core part is integrally projected on a male screw pipe part on the side to which the plastic pipe is connected, and the inner core part. A fitting device for a plastic pipe, comprising: a split ring fitted on the inner core portion so that the split core can be attached, and a tightening ring slidably fitted on the split ring. The outer peripheral surface is provided with a plurality of notches for locking which are inclined along the axial direction of the inner core portion, and the inner peripheral surface of the split ring has the above-mentioned notched portions at the completion of tightening of the split ring by the tightening ring. Of the split ring, the outer peripheral surface on the rear end side of the split ring is formed into a tapered surface portion that is gradually inclined toward the tip so as to have a smaller diameter. Correspondingly, the inner peripheral surface on the rear end side of the tightening ring is formed into a tapered surface portion, while the male screw tube portion of the joint body is formed with a rear end opening at a collar portion that abuts on the peripheral edge of the rear end portion of the tightening ring. And a coating layer made of a fluororesin is provided on at least a flat surface portion of the outer peripheral surface of the split ring and / or at least a flat surface portion of the inner peripheral surface of the tightening ring. Fitting device.