JP4081164B2 - Plastic pipe fittings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe joint, and more particularly to an improvement of a one-push type joint for resin pipes.
[0002]
[Prior art]
In recent years, resin pipes have been widely used around apartment buildings as well as in detached houses, and therefore, resin pipes are frequently connected. However, there is a high demand for water leakage and hot water pipe joints that are not allowed to leak and that the connection is simple. For this reason, many proposals have been made, but the present situation is that no satisfactory joint has yet appeared.
[0003]
Here, an example of a conventional joint for pipes is described. An O-ring as a countermeasure against water leakage and a grab ring for complete connection of resin pipes are inserted in a socket that is a main body of a joint for pipes. The resin pipe is inserted into this socket and the outer surface of the resin pipe is engulfed and connected by the grab ring claw, and an O-ring is sandwiched between the outer surface of the resin pipe and the inner surface of the socket to generate water leakage. It has a structure that prevents.
[0004]
However, the biggest drawback of a joint with a structure in which a locking ring such as a grab ring is shallow and an O-ring is deep is that when the resin pipe is inserted into the socket, the claw part of the grab ring causes the resin pipe to Even if a streak is formed on the outer surface in the axial direction of the pipe and an O-ring is fitted to the resin pipe, the streak-like flaw (dent) cannot be sealed, resulting in water leakage. It will end up.
[0005]
[Problems to be solved by the invention]
The present invention is intended to improve the above-described drawbacks of conventional pipe joints. For resin pipes that do not cause any damage due to the grab ring claw even when the resin pipe is inserted into the socket. The problem is to provide a joint.
[0006]
[Means for Solving the Problems]
The joint for resin pipes of the present invention has the following structure in order to solve the above problems. That is, a socket constituting a part of a joint body that allows insertion of a resin pipe, and a joint for a resin pipe in which an O-ring, a grab ring, and a backup ring are sequentially arranged in the socket . An annular recess is provided on the side opposite to the deepest part on the insertion side of the resin pipe from the arrangement part of the club ring, and a flange formed at the rear end of the cylindrical pipe cover is fitted into the annular recess with a gap, thereby forming a cylindrical shape. The front end of the pipe cover is an inclined part that faces the inner side of the socket and is applied to a joint that covers the grab ring claw. Usually, the step where the tip of the inserted resin pipe abuts the deepest part inside the socket. The portion 10a is formed, and then the step portion 10b for accommodating the O-ring is formed. More preferably, a confirmation hole for visually confirming the insertion of the resin pipe is formed in a portion of the joint body outside the O-ring in the socket of the joint body with respect to the deepest portion on the insertion side of the resin pipe. It is good.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Since the joint for resin pipes of the present invention has the above-described configuration, when the resin pipe is inserted into the socket, the inclined portion of the cylindrical pipe cover is pushed by the tip of the resin pipe, and the annular recess and the cylindrical pipe cover are connected. The cylindrical pipe cover moves toward the depth of the socket by the gap between the rear end flange. At this time, when viewed from the resin pipe, the cylindrical pipe cover covers the grab ring claw, and when the resin pipe passes through the grab ring claw, the outer surface of the resin pipe is not damaged by the claw. After the resin pipe reaches the deepest part of the socket, the cylindrical pipe cover returns by the gap between the annular recess and the flange at the rear end of the cylindrical pipe cover. Thus, when the tubular pipe cover is returned, the claw portion of the grabbing bites into the outer surface of the resin pipe, and the water leakage due to this scratch is completely eliminated. And since the O-ring in a socket closely_contact | adheres to the surface of a resin pipe, the outer peripheral side of the resin pipe in the outer side rather than the position of an O-ring is watertight. For this reason, preferably, a confirmation hole for visually confirming the insertion of the resin pipe is drilled in the joint body outside the O-ring in the socket of the joint body with respect to the deepest part on the insertion side of the resin pipe. It is recommended to confirm the insertion of the resin pipe.
[0008]
Normally, a step 10a and a step 10b are formed inside the socket which is the main body of the pipe joint. The step 10a confirms that the end of the resin pipe is completely inserted into the socket. The step portion 10b is a housing portion for the O-ring when the resin pipe is inserted. Due to the presence of the stepped portion 10b, the O-ring is pushed by the tip of the resin pipe and does not deform abnormally, so that a normal ring shape is maintained. The O-ring step 10b may be a circumferential groove.
[0009]
The socket that is the main body of the pipe joint of the present invention is usually made of gun metal, but may be made of resin such as polybutene or polyvinylidene fluoride in some cases.
[0010]
The cylindrical pipe cover used in the present invention may be made of resin, but is usually made of a metal such as SUS304 or SUS316 which is hardly damaged by the claw portion of the grab ring and has corrosion resistance. In this cylindrical pipe cover, the tip is usually reduced in diameter to form an inclined portion, and a plurality of slits are inserted from the tip.
[0011]
The resin pipe joint of the present invention has an O-ring positioned on the deep side of the socket and a grab ring disposed on the shallower side, which makes it easy to find that the resin pipe is insufficiently inserted. It also has the function of That is, when the resin pipe is inserted into the socket, the O-ring is fitted while the diameter of the O-ring is expanded by the tip of the resin pipe. Therefore, if the O-ring is closer to the inside of the socket than the grab ring, it may be misunderstood that the insertion has been completed just by passing the resin pipe through the O-ring. It will end up.
[0012]
However, in the joint for resin pipes of the present invention, since the O-ring is at the deepest part of the socket, the insertion resistance with the O-ring at the tip of the resin pipe is that the resin pipe is inserted to the deepest part. This is the first time that there is an insertion resistance, and it is possible to prevent poor insertion due to misunderstanding.
[0013]
【Example】
Hereinafter, the joint for resin pipes of the present invention will be described in more detail with specific examples.
FIG. 1 is a half cut view showing a first example of the joint for resin pipes of the present invention, and FIG. 2 is an exploded view thereof. The gunmetal socket 10 is formed with a step portion 10a and a step portion 10b from the deepest part on the insertion side of the resin pipe 30, and further, in this example, a step portion 10c. An O-ring 11 is arranged on the step portion 10b. A resin washer 12, then a grab ring 13, and a backup ring 14 are sequentially arranged on the step portion 10c. The backup ring 14 may be an independent member, but in this example, an annular member 17 having a male screw portion 16 screwed into a female screw portion 15 engraved on the inner peripheral surface of the socket 10 and The members are integrated, and each member is accommodated in the socket 10 by screwing them together.
[0014]
Then, the annular recess 14 ₀ is provided at the rear of the backup ring 14, the rear end of the tubular Paipukaba -20 is the flange 21 toward the outside is formed, the flange 21 is fitted with a gap to the annular recess 14 in the ₀ ing. Then, the front end of the tubular Paipukaba -20 is an inclined portion 22 towards the inside of the socket 1, so that the covering claw 13 ₀ of the grab ring 13 by the gap amount corresponding cylindrical Paipukaba -20 of movement.
[0015]
As shown in FIG. 2, this cylindrical pipe cover 20 has a rear end portion with an outward flange 21 and a front end portion having a slanted portion 22 with a reduced diameter. A number of slits 23 are formed in the axial direction on the flange portion. Yes.
[0016]
Now, each member is incorporated in the socket 10 in this way, and a sleeve 31 is fitted to the tip of the resin pipe 30 to be inserted in order to keep the inner diameter. In this state, the resin pipe 30 is inserted into the socket 10. It is inserted into the inside.
Figure 3 is a half-inserted resin pipe 30, a cut in half view when the leading end of the resin pipe 30 has passed through the claw portion 13 ₀ of the grab ring 13, FIG. 4 when the resin pipe 30 is fully inserted It is a half-cut diagram.
[0017]
In the resin pipe joint of the present invention, as shown in FIG. 3, when the resin pipe 30 is inserted into the socket 10, the inclined portion 22 of the cylindrical pipe cover 20 is pushed at the tip of the resin pipe 30, and the resin pipe is left as it is. tubular Paipukaba -20 is moved by a gap amount between the annular recess 14 ₀ and the flange 21 together with the pipe 30, thereby covering the claw portion 13 ₀ of the grab ring 13. Therefore, further in the case where the resin pipe 30 is inserted toward the deep portion does not directly contact the claw portion 13 ₀ of Guraguringu 13, while contacting the tubular Paipukaba -20 for the claw portions 13 ₀ Will be inserted. Thus a possible avoid scratching the outer surface of the resin pipe 30 by the pawl 13 ₀ grab ring 13.
[0018]
Thus, in the resin pipe joint of the present invention the resin pipe 30 and without any scratches that the surface of the plastic pipe 30 during mating by the claw portion 13 ₀ of the grab ring 13 of the socket 10, the depth side Even if the O-ring 11 is present, no water leaks.
[0019]
Figure 5 is a cut in half schematic diagram showing a second example of the plastic pipe fitting of the present invention, the washer -14 ₁ forming an inner diameter That annular recess 14 ₀ behind the backup ring 14 to form an annular recess 14 ₀ Is sandwiched between. Accordingly, the flange 21 of the tubular Paipukaba -20 washer -14 ₁ in inner diameter in this example is that the fit with a gap therebetween.
[0020]
Figure 6 is a cut in half schematic diagram showing a third example of the plastic pipe fitting of the present invention, to form an annular protrusion 17 ₀ from the annular member 17 to form an annular recess 14 _0, to the rear of the backup ring 14 it is obtained by forming an annular recess 14 _0. Therefore, the flange 21 of the tubular Paipukaba -20 in an annular recess 14 ₀ formed by an annular protrusion 17 ₀ is fitted with a gap in this example. In this example forms a circular projection 1 ₀ into the socket 1 in place of the washer -12 is obtained by constituting the inner peripheral groove 11 ₀ this by O- ring 11 fits.
[0021]
Reference numeral 40 is a construction confirmation hole formed in the socket 10 for such circular projection 1 _0. As can be seen from the figure, since the outer peripheral surfaces of the O-ring 11 and the resin pipe 30 are in close contact with each other in a watertight manner, the outer surface of the resin pipe 30 outside the O-ring 11 has no water leakage. Therefore, a hole 40 in a portion of the circular projection 1 ₀ outside the O- ring 11 in this region i.e. the socket 10, and performs confirmation of the insertion of the resin pipe 30. The formation of the construction confirmation hole 40 eliminates the phenomenon such as water leakage due to insufficient insertion of the resin pipe 30 and disconnection of the resin pipe 30.
[0022]
FIG. 7 is a schematic half-cut view showing a fourth example of the joint for resin pipes of the present invention, in which a cap 25 is screwed into a male screw 26 carved on the outer surface of the socket 10 instead of the annular member 17. This is an example in which each member is arranged in the socket 10 by the inner flange 27 of the cap 25. Incidentally, the washer -14 ₁ may be integral with the cap 25.
[0023]
【The invention's effect】
In the joint for resin pipes of the present invention, since there is no contact with the claw part of the grab ring when inserted into the socket, the outer surface of the pipe is not damaged, and therefore the occurrence of water leakage is extremely reduced. Furthermore, there is no shortage of pipe insertion in view of the structure, and there is a feature that work can be performed without requiring much skill during construction.
[Brief description of the drawings]
FIG. 1 is a half cut view showing a joint for resin pipes of the present invention.
FIG. 2 is an exploded view of the joint for resin pipes of FIG.
FIG. 3 is a half-cut view showing a state in which a tip of a resin pipe has passed through a claw portion of a grab ring.
FIG. 4 is a half-cut view when the resin pipe is completely inserted.
FIG. 5 is a half-cut schematic diagram showing a second example of the joint for resin pipes of the present invention.
FIG. 6 is a half-cut schematic diagram showing a third example of the joint for resin pipes of the present invention.
FIG. 7 is a half-cut schematic diagram showing a fourth example of the joint for resin pipes of the present invention. It is.
[Explanation of symbols]
10 ... Socket,
10a, 10b, 10c ... stepped part,
11 ... O-ring,
12. Washer,
13 Grabbing,
13 ₀ ... grab ring nails,
14 ... Backup ring,
15 ... Female thread engraved on the inner peripheral surface of the socket,
16 ... Male thread engraved on the annular member,
17 ... Annular member,
20 ... Cylinder-shaped pipe cover,
21 ... Flange,
22 ... inclined part,
23 ... slit,
25 ... Cap,
26 ...... Male thread engraved on the outer surface of the socket,
27 ... The inner flange of the cap,
30 ... Resin pipe,
31 ... sleeve,
40 ... Construction confirmation hole.

Claims (4)

A socket constituting a part of a joint body that allows insertion of a resin pipe, and a joint for resin pipe in which an O-ring, a grab ring, and a backup ring are sequentially arranged in the socket, wherein the club in the joint body An annular recess is provided on the opposite side of the resin pipe from the deepest portion on the insertion side of the ring, and a flange formed at the rear end of the cylindrical pipe cover is fitted with a gap in the annular recess, so that the cylindrical pipe cover The joint for resin pipes is characterized in that the front end is an inclined part toward the inside of the socket, and the inclined part covers the claw part of the grab ring.  The joint for resin pipes according to claim 1, wherein a stepped portion 10a is formed at the deepest portion inside the socket, and a stepped portion 10a is formed to contact the tip of the inserted resin pipe, and then a stepped portion 10b for accommodating an O-ring is formed.  The inclined portion of the cylindrical pipe cover is pushed by the tip of the resin pipe inserted into the socket, and when the tip of the resin pipe passes the claw portion of the grab ring, the cylindrical pipe cover is outside the tip of the resin pipe. The joint for resin pipes of Claim 1 which has covered the surface. The joint for resin pipes according to claim 1, wherein a construction confirmation hole is formed in a portion of the joint body outside the O-ring in the socket of the joint body with respect to the deepest portion on the insertion side of the resin pipe.

Images