JP4388214B2 - Plastic pipe fittings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint for resin pipes.
[0002]
[Prior art]
At the time of plumbing for water supply and hot water supply, draw the water supply main pipe and the hot water supply main pipe from the hot water supply equipment indoors, and connect the water supply main pipe and the hot water supply main pipe to the water supply pipe header and the hot water supply pipe header, As water supply pipes and hot water supply pipes connecting these headers to, for example, water stopcocks located upstream of the hot and cold water mixing taps in the bathroom, they are resistant to heat, such as crosslinked polyethylene or crosslinked polybutene, are not easily deformed, and rust. It is used by inserting a resin pipe having excellent durability into the bellows-like sheath tube, so that in the case of water leakage etc., the sheath tube is left as it is. There is convenience in that the resin pipe can be taken out from the inside of the sheath tube and replaced by simply releasing the connection at both ends.
[0003]
By the way, as a joint for resin pipes, there is a conventional joint comprising a joint body 71, a cap nut 72, and a split ring 73 as shown in FIGS. The connection procedure of the resin pipe P is as follows.
[0004]
(1) First, in order to confirm the insertion amount L of the resin pipe P into the joint body 71, a mark 74 is drawn with a pen or the like at a position separated from the end surface a of the resin pipe P by the insertion amount L [Fig. 6 (A)].
(2) The cap nut 72 and the split ring 73 are once removed from the joint body 71 of the joint assembled at the time of factory shipment, and these are inserted into the resin pipe P in the order of the cap nut 72 and the split ring 73 [Fig. 6 (B)].
(3) The resin pipe P is securely inserted all the way into the joint main body 71 (see FIG. 6C).
(4) The split ring 73 is pressed until it hits the joint body 71, and it is confirmed that the positions of the split ring 73 and the mark 74 coincide (see FIG. 7A).
(5) The cap nut 72 is fastened to the joint body 71 from the cap nut end portion 72a until the tip 73a of the split ring 73 protrudes by about 1 mm [see FIG. 7B].
(6) After tightening, a mark 75 is drawn on the cap nut 72 and the joint body 71 (see FIG. 7C).
[0005]
[Problems to be solved by the invention]
However, before putting the mark 74 on the resin pipe P, or before inserting the resin pipe P, the cap nut 72 and the split ring 73 are once removed from the joint body 71, or the removed cap nut 72 and split ring 73 are again attached to the resin pipe P. The cap nut 72 needs to be inserted or tightened in accordance with the protruding amount of the tip of the split ring 73, and the pipe connection work cannot always be performed quickly.
[0006]
The present invention has been made in consideration of the above-mentioned matters. The purpose of the present invention is to provide a joint for resin pipes that can quickly and reliably connect resin pipes by a one-touch operation by simply inserting a resin pipe into a joint body and tightening a cap nut. Is to provide.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a joint main body having male threads at one end and the other end, and an annular groove portion into which a resin pipe is inserted from the one end side toward the other end. A cap nut that is screwed into a male screw and a cylindrical body that is inserted into the annular groove while the barrel is in contact with the outer periphery of the annular groove, and the resin pipe is inserted through the cylindrical body that is inserted into the annular groove. Insert one end of the cylindrical body into the outer peripheral surface of the resin pipe while pressing the end surface of the resin pipe against the bottom of the annular groove, and then tighten the temporarily tightened cap nut. The resin pipe joint prevents the resin pipe from slipping out, and the annular groove portion has an annular taper surface inclined inward and downward at the outer peripheral end portion, while the cylindrical body. An annular bent piece that inclines outward from one end of the body portion so as to contact the tapered surface when the cap nut is temporarily fixed, and an inward flange that contacts the end surface of the resin pipe at the other end of the body portion. Furthermore, a claw that protrudes from the tip of the annular bent piece toward the outer peripheral surface of the resin pipe at the time of the temporary fixing and bites into the outer peripheral surface of the resin pipe at the time of the pressing operation of the resin pipe.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
1-5 shows one Embodiment of this invention used for the sheath pipe construction method of a water supply and hot water supply piping system. In this embodiment, the joint for the resin pipe is connected to the upstream side of the stop cock body.
[0009]
First, the water supply / hot water supply piping system will be briefly described. In FIG. 5, 1 is a hot water supply pipe, 2 is a water supply pipe, and the hot water supply pipe 1 includes a hot water supply pipe header 4 provided on the downstream side of the hot water supply main pipe 3 drawn indoors, for example, a washroom The stop cock main body 6 of the stop cock 5 for hot water located upstream of the hot-water mixing stopper A is connected. The water supply pipe 2 connects a water supply pipe header 8 provided on the downstream side of the water supply main pipe 7 drawn indoors and a water stopcock body 10 of the water stopcock 9. 11 is a hot water supply facility. The water stop cock 9 and the hot water stop cock 5 have the same structure.
[0010]
The hot water supply pipe 1 and the water supply pipe 2 are, for example, a resin pipe 18 of a cross-linked polybutene pipe for water or a cross-linked polyethylene pipe for water that is guided and protected by a sheath pipe 19 on the pipe path. , 2 are fixed at appropriate positions by fixing means 12 such as a band. The upstream end 18b of the water resin pipe 18 is connected to the header 8 by a connecting member 70a. Similarly, the upstream end 1 of the resin pipe 18 for hot water is connected to the header 4 by a connecting member 70b.
[0011]
Reference numeral 13 denotes a flexible hot water introduction pipe for connecting the hot water mixing tap A and the water stop cock 5. Reference numeral 14 denotes a flexible water introduction pipe that connects the hot-water mixing tap A and the stop cock 9.
[0012]
Next, a characteristic configuration of the present invention will be described.
[0013]
FIG. 1 shows a state in which a resin pipe is inserted into a joint for resin pipes in a cap nut temporarily fixed state assembled at the time of factory shipment. That is, FIG. 1 shows a state in the middle of inserting the resin pipe into the annular groove formed in the joint body in the joint for the resin pipe in which the cap nut is temporarily fixed to the joint body, and FIG. A state in which the connection operation of the resin pipe is completed by tightening the cap nut temporarily fixed after the pressing operation is completed to press the end surface until it hits the bottom of the annular groove portion is shown. FIG. 3 shows a connection procedure, and FIG. 4 shows a cylindrical body inserted into the annular groove. 1 and 3B show the same state, and FIGS. 2 and 3D also show the same state.
[0014]
1 to 5, 20 is a joint for resin pipes that is screwed to the upstream side of the stop cock main body 10 (or the stop cock main body 6), and includes a joint main body 21, a cap nut 22, and a tubular body. 23.
[0015]
In this embodiment, the joint body 21 is composed of two members 24 and 25. One member 24 is a vertically long cylindrical body, and includes a small diameter portion 26 and a large diameter portion 27 having a male screw m. The through hole 24 a of the one member 24 functions as a circular through hole that passes through the center of the joint body 21. Further, a male screw a is formed near the large diameter portion 27 at the boundary between the small diameter portion 26 and the large diameter portion 27. The other member 25 is a horizontally long cylindrical body, which includes a small-diameter portion 28 having a male screw n and a large-diameter portion 29, and an internal thread b that engages with the male screw a is formed at the end of the large-diameter portion 29. Is formed. The cap nut 22 is screwed onto the male screw n. The two members 24 and 25 are assembled by the male screw a, the female screw b and the adhesive c to form the joint body 21. In FIG. 1, 60 shows the assembly part.
[0016]
Reference numeral 30 denotes an annular groove into which the resin pipe 18 is inserted in the Z direction. The annular groove 30 is formed by the small diameter portion 26 and the other member 25 outside the flow hole 24 a of the joint body 21. That is, the annular groove portion 30 is formed to have a predetermined length between the small diameter portion 26 and the other member 25.
[0017]
The small-diameter portion 28 of the other member 25 has an annular tapered surface 43 that is inclined inward and downward at an end portion.
[0018]
31 is a visual hole for visual observation of the resin pipe end face 18a, and is formed so as to communicate with the annular groove 30. It is formed in the large diameter portion 29 of the other member 25.
[0019]
32 and 32 are O-rings provided on the outer peripheral surface of the small diameter portion 26 of one member 24.
[0020]
The cylindrical body 23 has an annular bent piece 33 that inclines outward from one end of the body portion 23a so as to contact the tapered surface 43 when the cap nut is temporarily fixed, and a resin pipe is provided at the other end of the body portion 23a. 18 and has an inward flange 34 abutting against the end face 18a. Further, when temporarily fixing the cap nut 22 as shown in FIGS. 1, 3A and 3B, the tip 66 of the annular bent piece 33 is provided. A plurality of claws 35 project from the resin pipe outer peripheral surface 18b (see FIG. 4) and bite into the resin pipe outer peripheral surface 18b during the pressing operation of the resin pipe 18 as shown in FIG. Continuously around the entire circumference. As shown in FIG. 4, each claw 35 has a sawtooth shape, and the circumferential angle formed by connecting the center r of the cylindrical body 23 and each vertex q ₁ , q ₂ of the adjacent claw 35 is 22.2. The opening angle of each claw 35 is set to 120 °.
[0021]
In addition, the joint main body 21, the cap nut 22, and the cylindrical body 23 are set in advance in the state shown in FIGS. 1, 3A, and 3B when the resin pipe joint 20 is shipped from the factory. That is, in FIG. 1, the cap nut 22 is temporarily fixed to the joint body 21 via the male screw n, leaving a gap H between the end surface 22a of the cap nut 22 and the end surface 29a of the large-diameter portion 29 of the other member 25. In addition, the tubular body 23 is annular in a state where the annular bent piece 33 of the tubular body 23 is in contact with the tapered surface 43 of the joint body 21 and the body portion 23a is in contact with the inner peripheral surface 25a of the other member 25. It is inserted into the groove 30.
[0022]
Thus, in order to connect the resin pipe 18 to the joint 20 for a resin pipe in the state of temporarily fastening the cap nut shown in FIG. As shown, the resin pipe 18 is inserted into the annular groove 30 through the cylindrical body 23. At this time, when the operator looks into the visual hole 31, it can be confirmed that the inward flange 34 of the cylindrical body 23 pressed by the resin pipe 18 has not reached the bottom 30 a of the annular groove 30.
[0023]
Further, as shown in FIG. 3C, the end surface 18 a of the resin pipe 18 is pressed until it abuts against the bottom 30 a of the annular groove 30. During this pressing operation, the annular bent piece 33 is sandwiched between the inner peripheral surface 25a of the other member 25 and the outer peripheral surface 18b of the resin pipe 18 and moves together with the resin pipe 18 toward the bottom 30a. The plurality of claws 35 bite into the outer peripheral surface 18b of the resin pipe 18 until it hits the bottom 30a while being deformed toward the resin pipe 18, whereby the end surface 18a of the resin pipe 18 is firmly pressed against the bottom 30a of the annular groove 30. Further, the resin pipe 18 can be reliably prevented from coming out of the annular groove 30. Moreover, since the work for preventing the slipping out is a one-touch work, it can be performed quickly.
[0024]
Subsequently, as shown in FIG. 3D, the resin pipe 18 can be prevented from rattling by tightening the cap nut 22.
[0025]
In addition, in the said embodiment, although the joint S for resin pipes used for the sheath pipe construction method was shown, of course, in this invention, it can apply also to a header construction method or a branch construction method, and it can apply also to cases other than these.
[0026]
Moreover, in the said embodiment, although what comprised the joint main body 21 from the two members 24 and 25 was employ | adopted, you may form a joint main body with one member.
[0027]
【The invention's effect】
According to the present invention, there is an effect that the resin pipe can be quickly and reliably connected to the joint body by a one-touch operation of inserting the resin pipe into the joint body and tightening the cap nut.
[Brief description of the drawings]
FIG. 1 is a structural explanatory view showing a cap nut temporarily fixed state according to an embodiment of the present invention.
FIG. 2 is a configuration explanatory diagram showing a connection completion state in the embodiment.
FIG. 3 is an explanatory diagram illustrating a connection operation procedure according to the embodiment.
FIG. 4 is a plan view of components in the embodiment.
FIG. 5 is an overall perspective view showing a water / hot water supply piping system to which the embodiment is applied.
FIG. 6 is a structural explanatory view showing a connection procedure of a conventional joint for resin pipes.
FIG. 7 is a structural explanatory view showing a connection procedure for a conventional joint for resin pipes.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 18 ... Resin pipe, 18a ... Resin pipe end surface, 18b ... Resin pipe outer peripheral surface, 20 ... Joint for resin pipes, 21 ... Joint main body, 22 ... Cap nut, 23 ... Cylindrical body, 23a ... Body part of cylindrical body, DESCRIPTION OF SYMBOLS 30 ... Ring groove part, 30a ... Bottom of ring groove part, 33 ... Ring bend piece, 34 ... Inward flange, 35 ... Nail | claw, 43 ... Ring taper surface, m, n ... Male screw.

Claims (2)

A joint main body having a male thread at one end and the other end, and having an annular groove into which a resin pipe is inserted from one end to the other end, a cap nut screwed into the male thread at one end of the joint main body, and the annular groove It consists of a cylindrical body inserted into the annular groove while the body part abuts on the outer periphery, and a resin pipe is inserted into the annular groove through the cylindrical body inserted into the annular groove, and the end surface of the resin pipe is A joint for a resin pipe that prevents the resin pipe from coming out by clamping the one end of the cylindrical body into the outer peripheral surface of the resin pipe while pressing until it hits the bottom of the annular groove, and then tightening the temporarily tightened cap nut The annular groove has an annular tapered surface inclined inward and downward at an outer peripheral end, while the tubular body is tapered when the cap nut is temporarily fixed. An annular bent piece that inclines outward from one end of the body part, and an inward flange that contacts the end face of the resin pipe at the other end of the body part. A joint for resin pipes, characterized by having a claw protruding from the tip of the piece toward the outer peripheral surface of the resin pipe and biting into the outer peripheral surface of the resin pipe during the pressing operation of the resin pipe. The said joint main body has a hole for confirming that the said end surface of the resin pipe is contacting the bottom of the said annular groove part via the said inward flange at the time of completion of the said pressing operation. Joint for resin pipes.

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