JP4516876B2 - Plastic pipe fittings - Google Patents

Description

  The present invention relates to a joint for resin pipes.

  Currently, a water supply / hot water supply piping system as shown in FIG. 3 is widely used. That is, in this system, a pipe header 3 is provided on the downstream side of the water supply main pipe 1 and the hot water supply main pipe 2 drawn indoors, and a washroom, a bathroom, etc. are provided via a plurality of supply pipes 4 connected to each pipe header 3. Water supply and hot water supply are performed to a water tap 5 (in the illustrated example, a hot and cold water mixing tap in the bathroom). Here, the supply pipe 4 is formed by covering a transparent or translucent resin pipe 6a (for example, a water-use polybutene pipe or a water-use cross-linked polyethylene pipe) with a sheath pipe 6b and protecting it, such as a band or a clamp. It is fixed appropriately by means 7. Further, on the upstream side of the hot water supply main pipe 2, a hot water supply facility 8 for making the hot water flowing in the hot water main pipe 2 suitable temperature is provided.

  In order to connect the supply pipe 4 to the pipe header 3, a joint 70 as shown in FIG. 4 has been conventionally used. In this joint 70, after the resin pipe 6 a is inserted between the outer cylinder 71 and the inner cylinder 72, the nut member 73 is screwed to the outer cylinder 71. The claw 74a of the ring body 74 disposed on the inner side bites into the resin pipe 6a, and the resin pipe 6a cannot be removed from the joint 70.

Further, in the joint 70 to which the resin pipe 6 a is connected as described above, a part of the indicator 75 housed in the through hole 71 a provided in the outer cylinder 71 is a predetermined position inside the outer cylinder 71. It is configured to be pushed out of the through hole 71a by the resin pipe 6a inserted up to. Therefore, since the insertion depth of the resin pipe 6a with respect to the outer cylinder 71 of the joint 70 can be confirmed by the indicator 75, the resin pipe 6a is connected in a state where it is inserted shallowly with respect to the outer cylinder 71. Can be prevented.
JP 2002-147680 A Japanese Patent No. 2975019

  However, the conventional joint 70 has the following problems. That is, the joint 70 is configured by using a joint body 76 that is integrally provided with an outer cylinder 71 and an inner cylinder 72. When the joint 70 is connected to the pipe header 3, the male screw part 77 provided on one end side of the joint body 76 is screwed to the female screw part 78 of the pipe header 3, and an adhesive is applied to the screwed part. It had been. Therefore, when the joint body 76 is connected to the pipe header 3, the orientation of the outer cylinder 71 may vary. In this case, the appearance of the pipe header 3 is deteriorated, and the indicator at the time of connecting the resin pipe 6a is displayed. If 75 is in a position where it is difficult to confirm, there is a possibility that connection failure of the resin pipe 6a may be caused.

  Further, in the above-described conventional joint 70, when the nut member 73 is screwed to the outer cylinder 71, the adhesive applied to the screwed portion is peeled off and the joint body 76 rotates together, and the joint 70 to the pipe header 3 is rotated. There was also a risk that the connection of was canceled.

  The present invention has been made in consideration of the above-described matters, and an object thereof is to provide a joint for resin pipes capable of easily and reliably connecting resin pipes.

  In order to achieve the above object, a joint for resin pipes according to the present invention includes a ring body in which a resin pipe inserted between an outer cylinder body and an inner cylinder body is disposed outside the resin pipe, and the inner cylinder. The ring body that is sandwiched between the body and the nail is biting into the resin pipe is held by a nut member that is screwed onto the outer cylinder body, and the inside of the through-hole provided in the outer cylinder body A part of the indicator accommodated in the resin pipe joint is configured to be pushed out of the through-hole by a resin pipe inserted to a predetermined position inside the outer cylinder, the inner cylinder An inner cylinder in a state of being connected at the connecting portion by providing a connecting portion and a flange portion in order from the one end side, and providing a narrow portion in the outer cylindrical body having an inner diameter smaller than the outer diameter of the flange portion. Body around the outer cylinder It is characterized in that it is configured to hold in a converter ready (claim 1).

  In the invention according to claim 1, since the outer cylinder body provided with the through hole in which the indicator is accommodated is rotatable around the axis, the resin pipe is obtained by rotating the outer cylinder body and stopping at an appropriate position. Thus, it is possible to easily check the state of the indicator during the connection work, and thus it is possible to connect the resin pipe easily and reliably, and to obtain a joint for resin pipe that can improve the workability. Also, in this joint for resin pipes, the outer cylinder rotates independently from the inner cylinder, so that when the nut member is screwed onto the outer cylinder, the inner cylinder does not rotate even if the outer cylinder rotates. Therefore, the co-rotating force is transmitted to the connecting portion, and the inner cylinder connected in the connecting portion is not removed from the connection target, and water leakage does not occur.

  Furthermore, when the joints for resin pipes are provided in, for example, a pipe header and are arranged in a plurality, the appearances of those joints are improved by aligning the directions of the outer cylinders of the joints, and the confirmation of the indicator is also performed from the same direction. It can be done by looking at it, and the effect that the confirmation work becomes easier is also obtained. Moreover, in the conventional joint for resin pipes, a joint body having an outer cylinder body and an inner cylinder body is used, whereas in the joint for resin pipes of the present invention, the outer cylinder body and the inner cylinder body are used. Are separated from each other, so that it is easy to process and the manufacturing cost can be reduced.

  1A and 1B are a plan view and a longitudinal sectional view schematically showing a configuration of a joint structure using a joint for resin pipes (hereinafter referred to as a joint) 9 according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view schematically showing a configuration of a main part of the joint structure. 3 that are the same as or equivalent to the members and the like shown in FIG.

  As shown in FIGS. 1A and 1B, a plurality of joints 9 are connected to the side surface of one pipe header 3, and each joint 9 includes an outer cylinder 10 and the outer cylinder as shown in FIG. An inner cylinder 11 disposed inside the body 10, a nut member (cap nut) 12 that is screwed onto the male screw 10 a of the outer cylinder 10, and a ring body 13 that is held inside the nut member 12. I have.

  Hereinafter, each member which comprises the coupling 9 is demonstrated, referring FIG.

  The outer cylinder 10 has a male screw 10a on the front end side (upper side in FIG. 2), and a hexagonal portion 10b having a larger outer diameter than other parts on the rear end side (lower side in FIG. 2). Yes. Further, a plurality of (for example, two) through holes 14 are provided in a portion between the external thread 10 a and the hexagonal portion 10 b of the outer cylinder 10, and an indicator 15 is accommodated in each through hole 14.

  Here, the through hole 14 is provided so that an annular groove 16 formed between the outer cylinder 10 and the inner cylinder 11 communicates with a space outside the outer cylinder 10. On the other hand, the indicator 15 is formed of a material obtained by mixing a fluorescent material with a soft resin such as rubber, for example, and has a cylindrical central portion 17 having a size to be fitted into the through-hole 14 and a central portion thereof. The taper part 18 provided in the one end side of the part 17 and the substantially hemispherical head 19 provided in the other end side are provided. The central portion 17 of the indicator 15 is provided with a plurality of (three in this embodiment) projections 20 that abut against the through-hole wall that forms the through-hole 14. It extends parallel to the axis of the part 17.

  Further, a narrow portion 21 having an inner diameter smaller than that of the other portion is provided inside the hexagonal portion 10b.

  The inner cylinder 11 has, in order from the rear end side (lower side in FIG. 2), a male screw 11a as a connecting portion, an annular groove 11b, and a flange portion 11c. The annular groove 11b has a sealing member as a sealing member. The O-ring 22 is detachably fitted. The outer diameter of the flange portion 11 c is larger than the inner diameter of the narrow portion 21 of the outer cylindrical body 10.

  The nut member 12 has a female screw 12a that is screwed to the male screw 10a of the outer cylinder 10 on the rear end side (lower side in FIG. 2), and a tapered portion 12b is provided on the inner wall on the front end side (upper side in FIG. 2). The tip side is smaller in diameter.

  The ring body 13 is, for example, a split ring made of stainless steel, and is disposed outside the resin pipe 6a (see FIG. 3). Tapered surface portions 13 a and 13 b are provided on one end side and the other end side of the outer peripheral surface of the ring body 13. In addition, annular claws 23 are formed at two locations on the inner circumferential surface of the ring body 13.

  As shown in FIG. 2, the joint structure having the above configuration is in a state where the resin pipe 6 a is not inserted into the annular groove 16 at the time of factory shipment. At this time, the indicator 15 is connected to the through hole 14. It does not protrude to the outside and is contained in the through hole 14. The indicator 15 is reliably prevented from coming out of the through-hole 14 by friction between the protrusion 20 and the through-hole wall that forms the through-hole 14 provided in the central portion 17 of the indicator 15.

  At the construction site, first, an adhesive is applied to the male screw 11a of the inner cylinder 11 or the female screw 3a of the pipe header 3, and both 11a and 3a are screwed together. At this time, the portion on the rear end side of the flange portion 11 c of the inner cylinder body 11 is in a state of being inserted through the narrow portion 21 of the outer cylinder body 10. Therefore, the inner cylindrical body 11 in a state connected by the male screw (connecting portion) 11a holds the outer cylindrical body 10 in a state of being rotatable around the axis.

  Subsequently, the resin pipe 6 a is inserted between the outer cylinder body 10 and the inner cylinder body 11, and the nut member 12 is screwed onto the male screw 10 a of the outer cylinder body 10. Thereby, the resin pipe 6a inserted between the outer cylinder body 10 and the inner cylinder body 11 is sandwiched between the ring body 13 and the inner cylinder body 11, and the claw 23 is bitten into the resin pipe 6a. The ring body 13 is held by the nut member 12.

  Specifically, as described above, the tip end of the nut member 12 is provided with the tapered portion 12b that contacts the tapered surface portion 13a of the ring body 13, and the outer cylindrical body 10 is provided with the taper surface portion of the ring body 13 at the distal end. A tapered portion 24 that abuts against 13b is provided. Accordingly, as the nut member 12 is screwed, the ring member 13 formed of the split ring is tightened by the nut member 12 and the outer cylindrical body 10, and the ring body 13 is deformed in a reduced diameter. And the nail | claw 23 of the ring body 13 is comprised so that it may bite into the resin pipe 6a with this clamping | tightening, and, thereby, the connection of the resin pipe 6a and the coupling 9 is completed.

  Here, when the resin pipe 6a is inserted into the annular groove 16, if the insertion of the resin pipe 6a becomes shallow, the connection between the resin pipe 6a and the joint 9 may be poor. Such inconvenience does not occur. That is, when the resin pipe 6a is inserted to a predetermined position inside the outer cylindrical body 10 (in the annular groove 16), the indicator 15 is brought into contact with the tip of the inserted resin pipe 6a. A part is configured to be pushed out of the through hole 14. Therefore, by using the indicator 15 as a clue, the insertion of the resin pipe 6a can be reliably prevented from becoming shallow. Further, since the indicator 15 includes a fluorescent material and can be visually recognized even in a dark place, the position of the indicator 15 and the state of the joint 9 can be easily grasped even in a dark place.

  In addition, since the outer cylinder 10 having the through-hole 14 in which the indicator 15 is accommodated can be rotated around the axis, the outer cylinder 10 is rotated and stopped at an appropriate position, so that the indicator 15 The state can be confirmed easily and reliably. Further, since the outer cylinder 10 rotates independently from the inner cylinder 11, even when the outer cylinder 10 rotates when the nut member 12 is screwed to the outer cylinder 10, the inner cylinder 11 does not rotate. Therefore, the adhesive applied between the male thread 11a of the inner cylinder 11 and the female thread 3a of the pipe header 3 is peeled off by co-rotation, and the connection of the inner cylinder 11 to the pipe header 3 is released. There is no such thing as being done.

  In the above embodiment, the fluorescent material is mixed with the resin constituting the indicator 15. However, instead of such a configuration, for example, the fluorescent material may be applied to the surface of the resin constituting the indicator 15. Good. That is, the indicator 15 only needs to have a fluorescent material on the surface.

  Moreover, in the said embodiment, although the indicator 15 is made into the integral type, when the said head part 19, the center part 17, and the taper part 18 are isolate | separated and the resin pipe 6a is inserted in the annular groove 16, for example, The head 19 may be configured to jump out of the through hole 14 and fall. In this case, it is preferable to provide a protrusion on the outer peripheral surface of the head 19 that contacts the through-hole wall that forms the through-hole 14.

(A) And (B) is the top view and longitudinal cross-sectional view which show schematically the structure of the joint structure using the joint for resin pipes which concerns on one embodiment of this invention. It is a longitudinal cross-sectional view which shows schematically the structure of the principal part of the said joint structure. It is explanatory drawing which shows roughly the structure of the water supply / hot-water supply piping system in which the said joint for resin pipes is used. It is a longitudinal cross-sectional view which shows the structure of the conventional joint for resin pipes roughly.

Explanation of symbols

6a Resin pipe 9 Joint for resin pipe 10 Outer cylinder body 11 Inner cylinder body 11a Connection part 11c Flange part 12 Nut member 13 Ring body 14 Through-hole 15 Indicator 21 Narrow part 23 Claw

Claims (1)

  A state where the resin pipe inserted between the outer cylinder body and the inner cylinder body is sandwiched between the ring body arranged on the outside of the resin pipe and the inner cylinder body, and the claw has bite into the resin pipe. The ring body is held by a nut member that is screwed to the outer cylinder body, and a part of the indicator housed in a through hole provided in the outer cylinder body is a predetermined inside of the outer cylinder body. A joint for a resin pipe configured to be pushed out of a through hole by a resin pipe inserted to a position, provided with a connecting portion and a flange portion in order from one end side of the inner cylindrical body, By providing the outer cylindrical body with a narrow portion having an inner diameter smaller than the outer diameter of the flange portion, the inner cylindrical body connected by the connecting portion holds the outer cylindrical body in a rotatable state around the axis. It is structured as follows That plastic pipe fittings.

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