JP3968397B1 - Synthetic resin water pipe fittings - Google Patents

Abstract

Provided is a low-cost joint capable of rotating a water pipe even when an internal pressure is applied to the connected water pipe.
A joint body 21 having an inner cylinder 22 and an outer cylinder 10 formed on the outer peripheral side of the inner cylinder 22 and a flexible synthetic resin made of cross-linked polyethylene or polybden are used. An end portion of the water pipe is inserted between the inner cylinder 22 and the outer cylinder 10, and has at least one connection port that is connected to the joint body 21 in a non-detachable and water-stopped state. A synthetic resin water pipe joint 100 for connecting a water pipe connected to a port to a connected device, wherein the inner cylinder 22 is in close contact with the inner peripheral surface of the water pipe inserted into the connection port. An annular water-stop seal 23 is externally fitted, and has a plurality of claws 24a that dig into the inner peripheral surface of the water pipe, and the claw is provided to prevent the water pipe from being pulled out from the connection port. With 24a biting into the inner surface of the water pipe, the water pipe and the water pipe An annular retaining ring 24 that is rotatable in the circumferential direction around the cylinder 22 is externally inserted, and the outer cylinder 10 is provided at the end of the outer cylinder 10 and is engaged with the joint body 21. An engaging portion 12a that is slidably engaged with the portion 22d, and at least a portion of the outer cylinder 10 facing either the water seal 23 or the retaining ring 24 is circumferential with respect to the joint body 21. It was provided so as to be freely rotatable in the direction.
[Selection] Figure 1

Description

  The present invention relates to a joint for a synthetic resin water pipe that can rotate the water pipe for fine adjustment even after connection, and in particular, even in a state where the internal pressure is acting by letting water flow through the water pipe, The present invention relates to a joint for a synthetic resin water pipe capable of rotating the water pipe.

  Conventionally, a pipe body made of a synthetic resin such as cross-linked polyethylene or polybuden has been adopted as a water supply pipe for water supply or hot water supply. Various "joints" that enable easy and reliable connection of such water pipes to devices such as headers (water separators) have been proposed in the past, and in particular, those described in Patent Documents 1 to 3 below. Is listed as a typical prior art.

  First, the joint (A) described in Patent Document 1 is the outer side of the water pipe (22) and disposed in the joint (A), and the retaining ring (18) in the cap nut (14). The claw provided inside the retaining ring (18) bites into the outer peripheral surface of the water pipe (22) by being pinched between the guide part (8) inserted into the water pipe (22). Thus, the water pipe (22) is connected so as not to be removable. According to this joint (A), the water pipe (22) can be securely connected by simply inserting the water pipe (22) into the guide (8) in the joint (A) and inserting the cap nut (14). This is an effective technique in that it can be fixed.

  However, the joint (A) has a structure in which the water pipe (22) is clamped between the retaining ring (18) and the guide portion (8) to prevent the joint from passing through the joint (A). After the water pipe is connected, the inner and outer surfaces of the water pipe are brought into close contact with the joint (A) and a strong friction is generated, so that the water pipe can no longer be rotated. Therefore, if the `` stress in the torsional direction '' generated during or after piping continues to act on the water pipe connected to the joint for many years, from the biting site of the `` claw '' in the water pipe, It was a cause of water leakage due to expansion of breakage.

  The joints described in Patent Document 2 and Patent Document 3 have been proposed as solutions that can solve the problems included in the technique described in Patent Document 1. The joints described in these patent documents are those in which a water pipe is rotatably connected to the joint, and a retaining ring is rotatably accommodated in the joint (Patent Document 2), or An outer cylinder is provided rotatably (Patent Document 3). According to these joints, the water pipe can be rotated even if it is connected immediately after the water pipe is inserted into the joint.

  However, once water is circulated in the water pipes connected to these joints, the water pipe is always in a state where the inner and outer diameters are slightly expanded by the water pressure (internal pressure) from the inside, so smooth rotation Will be inhibited. More specifically, first, in the joint (10) described in Patent Document 2, the outer peripheral surface of the water flow pipe (13) whose diameter is expanded by the internal pressure is brought into pressure contact with the inner peripheral surface of the joint and the friction resistance is increased. This is not only an obstacle to smooth rotation, but also because the outer peripheral surface of the water pipe (13) deeply bites into the claw (20) of the retaining ring (15, 16). The problem that 13) breaks can also arise.

On the other hand, in the joint described in Patent Document 3, the outer cylinder (3) is rotatable even if the outer peripheral surface of the water pipe (P) whose diameter is expanded by the internal pressure presses the outer cylinder (3). It is considered that the water pipe (P) can be rotated relatively easily even after the water has been circulated. However, the `` internal pressure '' that occurs when water is circulated in the water pipe (P) is not only to expand the diameter of the water pipe (P) but also to cause the water pipe (P) to come out of the joint. The force in the direction to do will also act simultaneously. Accordingly, the holding ring (2) tries to hold the water pipe to be removed, and the holding ring (2) biting into the outer peripheral surface of the water pipe is pulled toward the distal end of the outer cylinder (3). Along with this, the outer peripheral surface of the holding ring (2) is pressed against the tapered surface inside the outer cylinder (3), the holding ring (2) is reduced in diameter, and the water pipe (P) is strongly pinched. It becomes. That is, in the joint described in Patent Document 3, as with the joint described in Patent Document 1, the drainage-prevented water pipe is pressed against the inner cylinder side and eventually cannot be rotated. is there.
Japanese Patent No. 3600764 (FIGS. 3 and 4) JP 2003-307290 A (FIGS. 2 and 3) Japanese Patent Laying-Open No. 2003-28373 (FIG. 4)

  Therefore, in view of the above problems, the present invention arranges a “prevention ring” and a “waterproof seal” on the inner cylinder of the joint main body to perform “prevention” and “waterstop” from the inside of the water conduit, By pressing the water pipe from the outside with an outer cylinder that is freely rotatable, the “retaining ring” and the “outer cylinder” are also driven along with the rotation of the water pipe, and the water pipe is freely rotated. It has been devised to realize that it can. Therefore, the problem to be solved by the present invention is to provide a joint that can rotate the water pipe easily and reliably even after the water pipe is mounted on the joint at low cost.

In order to solve the above-mentioned problems, the means taken by the present invention are as follows.
First, the invention according to claim 1 includes a joint main body 21 having an inner cylinder 22 and an outer cylinder 10 formed on the outer peripheral side of the inner cylinder 22 and is made of a flexible material such as a cross-linked polyethylene or a polybden. At least one connection port that is inserted between the inner cylinder 22 and the outer cylinder 10 and is connected to the joint main body 21 in a non-detachable and water-stop state is inserted into the end portion of the synthetic resin water pipe having And a synthetic resin water pipe coupling 100 for connecting a water pipe connected to the connection port to a connected device, the water pipe being inserted into the connection port in the inner cylinder 22. An annular water seal 23 that is in close contact with the inner peripheral surface of the water pipe is externally fitted, and a plurality of claws 24a that dig into the inner peripheral surface of the water pipe are provided radially, and the water pipe is removed from the connection port. In a state where the claw 24a bites into the inner surface of the water pipe to prevent An annular retaining ring 24 that is rotatable in the circumferential direction around the inner cylinder 22 along with the water pipe is externally inserted, and the outer cylinder 10 has an engaged portion 22d provided in the joint body 21 at its end. It has the engaging part 12a engaged slidably with respect to the circumferential direction, and is provided so as to be rotatable with respect to the joint body 21 in the circumferential direction.

  Next, the invention according to claim 2 is characterized in that, in the joint 100 according to claim 1, the joint body 21 and the inner cylinder 22 are formed of separate members and are integrally formed by screwing them together. It is what.

  According to a third aspect of the present invention, in the joint 100 according to the first or second aspect, the retaining ring 24 that is externally inserted into the inner cylinder 22 is a water-stop seal 23 that is externally fitted to the inner cylinder 22. It is characterized by being arranged closer to the connection end.

  Furthermore, the invention according to claim 4 is the joint 100 according to any one of claims 1 to 3, wherein the retaining ring 24 externally inserted into the inner cylinder 22 is disposed at a connection end portion of the inner cylinder 22. The fastener 26 is rotatably fixed, and a thread groove is formed in the water pipe connecting end portion of the inner cylinder 22, and a thread groove that can be screwed into the thread groove is formed in the fastener 26. Are screwed to each other.

  According to a fifth aspect of the present invention, in the joint 100 according to any one of the first to fourth aspects, the outer cylinder 10 is provided with an opening window 13 for viewing the insertion position of the water pipe. It is what.

  The invention according to claim 6 is characterized in that, in the joint 100 according to any one of claims 1 to 5, the connecting portion of the outer cylinder 10 to the joint body 21 is formed of a synthetic resin. It is.

  The invention according to claim 7 is characterized in that, in the joint 100 according to any one of claims 1 to 5, the outer cylinder 10 is formed of a synthetic resin.

  The invention according to claim 8 is characterized in that, in the joint 100 according to any one of claims 1 to 7, the joint body 21 has a threaded portion that can be connected to a header or a water heater. Is.

  The invention according to claim 9 is the joint 100 according to any one of claims 1 to 7, wherein the joint body 21 is formed integrally with a header or a water heater. .

  The invention according to a tenth aspect is the joint 100 according to any one of the first to seventh aspects, wherein the inner cylinder 22 and the outer cylinder are respectively connected to the connection ports according to the number of the plurality of water pipes to be connected. 10.

The effects obtained by adopting the above means are as follows.
First, in the joint 100 of the invention according to claim 1, the water stop seal 23 and the retaining ring 24 are disposed on the inner cylinder 22 of the joint body 21. An annular water stop seal 23 fitted on the inner cylinder 22 is in close contact with the inner peripheral surface of the water pipe inserted into the connection port, and prevents water leakage from the water pipe when water is circulated. Become. However, since the diameter of the water pipe expands when a high water pressure is generated in the water pipe, the diameter of the water pipe is suppressed by the outer cylinder 10 provided at a position facing the water stop seal 23. Thus, it is possible to prevent water leakage from between the water seal 23 and the water pipe. Further, since the retaining ring 24 has a plurality of claws 24a radially, when the water pipe that has entered the connection port tries to be removed from the connection port, the claw 24a is moved outward. It opens and presses while biting into the inner peripheral surface of the water pipe. Although the diameter of the water pipe pressed from the inside by the claw 24a is increased, the water pipe is in close contact with the inner peripheral surface of the outer cylinder 10 provided at the position facing the claw 24a in the joint 100. The diameter will be suppressed. Since the outer cylinder 10 is provided so as to be rotatable in the circumferential direction with respect to the joint body 21, the water pipe that is in close contact with the inner peripheral surface of the outer cylinder 10 rotates simultaneously with the retaining ring 24 that bites into the inner peripheral surface. It becomes possible to make it. Furthermore, since the retaining ring 24 has an annular shape without a slit (separating portion), when the water pipe is connected to the joint 100 and compressed, the retaining ring 24 is uniformly reduced in diameter. Become. Therefore, the load can be uniformly engaged with the inner peripheral surface of the water pipe without locally concentrating the load on the inner peripheral surface of the water pipe.

  Next, in the invention according to claim 2, the “joint body 21” and the “inner cylinder 22” are separate members, and these are screwed together so as to be integrally formed. The coupling 100 can be easily assembled by inserting the annular retaining ring 24 from the threaded end. Further, by configuring the “joint body 21” and the “inner cylinder 22” as separate members, each component member can be manufactured by an optimum processing method, so that the cost can be reduced. Can be provided at low cost.

  Moreover, in the invention which concerns on Claim 3, since the retaining ring 24 is arrange | positioned rather than the water stop seal 23 on the inner cylinder 22 at a connection end side, after a water pipe is connected, internal pressure ( Exposed to water pressure). Therefore, even if the retaining ring 24 is engaged with the water pipe expanded in diameter by the internal pressure, it is possible to avoid the water pipe from adhering to the inner cylinder 22 in the vicinity of the retaining ring 24. Therefore, even if the water flow pipe has generated, it can be freely rotated together with the outer cylinder 10. Therefore, after the installation of the joint 100 and the water pipe is completed, even if the water is circulated in the water pipe and the internal pressure is generated in the water pipe, the water pipe smoothly rotates. Is possible. There are cases in which the “twist” that appears only when water actually flows through the water pipe does not appear twisted at the time of piping construction. In this respect, according to the invention according to the present claim, even if a stress caused by “twist” is generated in the water pipe, it is possible to eliminate the stress, so that the burden in the vicinity of the joint portion in the water pipe can be reduced. It becomes possible.

  Furthermore, in the present invention, when the joint body 21 is formed as a screwed portion that can be connected to a connected device (Claim 8), even if the water pipe is connected to the joint 100, It is possible to rotate only the joint 100 and screw the screwed portion of the joint 100 into a header (or a water heater; the same applies hereinafter), or to retighten the screwed joint 100. In other words, even if the pipes are surely joined at the time of piping construction, the presence / absence of water leakage is not known until water pressure is actually generated in the pipes. In view of this, the present invention allows re-tightening of the joint 100 screwed without twisting the water pipe even when water leakage is found from the joint between the joint 100 and the header through the water pipe. It was possible. Thereby, the joint between the joint 100 and the header can be further ensured. In particular, the effect that the water pipe can be smoothly rotated even when the water pressure is acting in the water pipe is an extremely advantageous point compared to the prior art.

  According to the invention of claim 4, a thread groove is formed at the water pipe connecting end portion of the inner cylinder 22, and a thread groove that can be screwed to the thread groove is formed in the fastener 26, so that the retaining ring 24 is formed. Since the annular retaining ring 24 can be inserted from the threaded end portion of the inner cylinder 22 with the fastener 26, the joint 100 can be easily assembled. It becomes possible.

  In the invention which concerns on Claim 5, since it has the opening window 13 in the outer cylinder 10, the insertion position of a water pipe can be visually observed with the said opening window 13, and the said water pipe can be mounted | worn reliably. In particular, in the joint 100 according to the invention described in claim 3, when the water pipe is connected, the water stop seal 23 is disposed near the end of the water pipe in the joint body 21. In order to confirm the reliable covering of the seal 23, the opening window 13 plays a large role.

  According to the invention which concerns on Claim 6, since the connection part with the coupling main body 21 in the outer cylinder 10 was formed with the synthetic resin which has flexibility, the fitting of the outer cylinder 10 with respect to the coupling main body 21 becomes easy. Further, when the “connecting portion” is made of synthetic resin, the frictional resistance of the joint body 21 with respect to the engaged portion 22d is small, which contributes to lightening the rotation of the installed water pipe. In addition, by forming the outer cylinder 10 other than the “connecting portion” with a metal, it is possible to ensure the necessary mechanical strength with a thin wall thickness.

  According to the invention which concerns on Claim 7, it becomes possible to provide this coupling 100 at low cost by forming the outer cylinder 10 with a synthetic resin.

  According to the invention which concerns on Claim 9, since the coupling main body 21 was comprised integrally with a header or a water heater, it was possible to connect a water pipe to these connected devices easily and reliably. Even after this, the water pipe can be rotated.

  And according to the invention concerning Claim 10, since the joint main body 21 in one joint 100 is comprised integrally with the joint main body 21 in the other joint 100, so-called "two-way joint" and "three-way joint" are used. Even when configured, an effect unique to the present invention is exhibited.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the examples shown in FIGS.
As shown in FIG. 1, the joint 100 according to the present invention includes an “outer cylinder 10”, a “joint body 21”, and an “inner cylinder 22”. The outer cylinder 10 includes a “tubular member 11”. ”,“ Engagement portion 12 ”, and“ opening window 13 ”, and on the inner cylinder 22, a“ waterproof seal 23 ”, a“ prevention ring 24 ”, a“ spacer 25 ”, and a“ fastener 26 ”. And “pressing member 27” and “guide member 28”. Hereinafter, each component will be described.

  First, the configuration of the outer cylinder 10 will be described. First, the “cylindrical member 11” in the outer cylinder 10 has an inner diameter that allows insertion of a connected water pipe. More specifically, when connecting a water pipe to this joint 100, while ensuring smooth insertion with respect to the outer cylinder 10, when water is passed through the water pipe and the diameter of the water pipe is expanded. For this, it is preferable that the inner diameter of the water pipe and the inner circumference of the outer cylinder 10 are set to be close to each other. This is because the joint 100 according to the present invention is held by the outer cylinder 10 from the outside of the inserted water pipe, and is engaged by a retaining ring 24 (described later) from the inside of the water pipe. This is because the water pipe is sandwiched from both the inside and outside (see FIG. 6). Here, in the outer cylinder 10, at least a portion facing a water stop seal 23 (described later) and a retaining ring 24 (described later) is rotatable in the circumferential direction with respect to the joint body 21 via an engaging portion 12 (described later). Therefore, when the outer peripheral surface of the water pipe expanded by the internal pressure is in close contact with the inner peripheral surface of the tubular member 11, the outer cylinder 10 and the water pipe can be rotated simultaneously. is there. In the above description, the entire outer cylinder 10 is described as rotating. However, the technical idea according to the present invention is not particularly limited to this, and at least the water-stop seal 23 (described later) in the outer cylinder 10 is not limited thereto. If the portion opposite to) is rotatable in the circumferential direction with respect to the joint body 21, the problem can be solved. The cylindrical member 11 is not particularly limited in shape as long as it can perform the above function. However, the cylindrical member 11 is suitable because it can be manufactured with the minimum necessary raw materials when configured in a “cylindrical shape”.

  Next, the “engagement portion 12” in the outer cylinder 10 is provided at the end of the cylindrical member 11, and engages the outer cylinder 10 with the joint body 21 in a freely rotatable manner. Therefore, it is necessary to make the structure (shape / dimension) into a shape that can be engaged with an engaged portion 22d (described later) provided in the joint body 21. More specifically, if the engaged portion 22d formed of a single groove formed on the outer peripheral surface of the joint body 21 is configured, the annular protrusion 12a or one or more that can be engaged with the groove is formed. It is conceivable that the projection 12a is projected on the inner peripheral surface of the outer cylinder 10. The technical idea according to the present invention is not limited to such a structure. If the expanded water pipe does not hinder the rotation of the outer cylinder 10, a protrusion is provided on the joint body 21 side and the outer cylinder 10 side is provided. A structure may be adopted in which grooves are provided to engage with each other. Further, in the present invention, the “outer cylinder 10” includes the “tubular member 11” and the “engagement portion 12” made of a single metal material (for example, “brass”, preferably “bronze”, the same applies hereinafter) or In addition to the case where they are integrally formed of a synthetic resin material (for example, a synthetic resin generally referred to as “engineering plastic” or “super engineering plastic”; hereinafter the same), “tubular member 11” and “engaging portion 12”. May be formed of different materials and assembled into a single unit. Specifically, it is preferable that the cylindrical member 11 facing the water seal 23 and the retaining ring 24 is made of a metal material and the engaging portion 12 is made of a synthetic resin material, and these are integrally assembled. By forming the cylindrical member 11 from a metal material, it is possible to reliably suppress the expanded water pipe, and by forming the engagement portion 12 from a synthetic resin material, easy fitting to the joint body 21 is possible. This is because the rotation of the outer cylinder 10 can be lightened because the friction against the joint body 21 is reduced. It is also conceivable that the outer cylinder 10 formed of a synthetic resin material is covered with a metal cylinder to compensate for the mechanical strength of the outer cylinder 10.

  Further, the “opening window 13” in the outer cylinder 10 is provided in the vicinity of the connection portion of the outer cylinder 10 with the joint body 21, and enables visual confirmation of the insertion position of the water pipe with respect to the joint 100. . In the present invention, the shape of the “opening window 13” is not particularly limited as long as the insertion position of the water pipe with respect to the joint 100 can be visually confirmed. Note that, as described above, in the present invention, the outer cylinder 10 can be partially or entirely made of synthetic resin, and therefore the portion where the opening window 13 is arranged is made of synthetic resin. In addition, the shape of the opening window 13 can be variously configured. Specifically, in the case where the thickness around the opening window 13 is formed into a tapered shape, the finger of the operator who installs the joint 100 can enter the opening window 13 so that it is effective. It is. This is because, depending on the installation location of the joint 100, the opening window 13 may not be visually confirmed. In that case, an operator causes his / her finger to enter the opening window 13 to connect the water pipe. This is because reliable insertion can be confirmed by “scrubbing”. Furthermore, it is also possible to implement the visual confirmation by the operator by configuring the opening window 13 portion with a transparent synthetic resin. In addition, when the whole outer cylinder 10 is comprised with a synthetic resin, although the thickness of the said outer cylinder 10 needs to be thickened a little compared with the case where it comprises with a metal, the said coupling 100 is provided cheaply. It becomes possible to do.

  Next, the configuration of the “joint body 21” will be described. First, the joint main body 21 performs connection to a connected device such as a “header (water separator)” or a “water heater”. In the present invention, the “joint body 21” is not particularly limited, and should be arbitrarily changed according to the structure (shape / dimension) of the connection portion of various devices to be connected. Specifically, it is conceivable to form a screwed portion that can be screwed into the connection port of the connected device to realize a reliable connection with the connected device. In addition, when the said joint main body 21 is integrally formed with the said to-be-connected apparatus, it is not necessary to provide the said screwing part.

  Next, the “inner cylinder 22” is provided on the water pipe connecting end side of the joint body 21, and enters the inside from the end opening of the water pipe to be connected. A “connection port” for allowing the water pipe to enter between the inner peripheral surface of the outer cylinder 10 is configured. More specifically, the inner cylinder 22 is integrally formed with the joint main body 21 or the inner cylinder 22 is screwed into a screw hole opening provided in the joint main body 21. A water stop seal 23 (described later) retaining ring 24 (described later) and a fastener 26 (described later) are disposed on the outer peripheral surface of the “inner cylinder 22”.

  Further, the “water-proof seal 23” in the joint body 21 has an annular shape, and is fitted on the groove 22e formed on the outer peripheral surface of the inner cylinder 22 and is in close contact with the inner peripheral surface of the connected water pipe. Thus, water leakage from the end opening of the water pipe is prevented. More specifically, it is conceivable that an O-ring made of synthetic rubber or natural rubber is fitted into a groove 22e formed on the outer peripheral surface of the inner cylinder 22. The number of the water stop seals 23 may be one as long as water leakage from the opening of the water pipe can be prevented, but it is preferable to provide two or more water leakage seals in order to prevent water leakage more reliably. is there. Further, in the present invention, the “groove 22 e” in which the water stop seal 23 is disposed is formed in a nut shape on the peripheral surface of the inner cylinder 22 in addition to the case where it is directly formed on the peripheral surface of the inner cylinder 22 in the joint body 21. It is also possible to configure the groove 22e by screwing the member or by inserting a spacer-like (or washer-like) member. In addition to the case where the O-ring is formed in a circular cross section, the outer peripheral surface is formed in a tapered shape as a substantially trapezoidal cross section, and avoids “breakage” and “turn-up” of the O-ring when the water pipe is inserted. It may be a thing.

  Furthermore, the “prevention ring 24” in the joint body 21 is an annular member that is externally inserted on the inner peripheral surface of the inner cylinder 22, and has a plurality of claws 24a that bite into the inner peripheral surface of the water pipe. In order to prevent the water pipe from being pulled out from the connection port, the fastener 26 is configured to be rotatable in the circumferential direction around the inner cylinder 22 together with the water pipe while the claw 24a bites into the inner surface of the water pipe. (To be described later). That is, since the retaining ring 24 is an annular member without a slit portion (separation portion) having a plurality of claws 24a radially, when the water pipe is compressed after being connected, the diameter can be uniformly reduced. Therefore, the load can be uniformly engaged with the inner peripheral surface of the water pipe without locally concentrating the load on the inner peripheral surface of the water pipe. Moreover, since the said retaining ring 24 is an annular member without a slit part (separation part), when inserting a water pipe, it does not distort at a slit part. Thereby, it can avoid reliably that a load (burden) reaches locally with respect to a water pipe. The number of the retaining rings 24 may be one as long as the water pipe can be prevented from being removed, but it is preferable to provide two or more if the prevention of the withdrawal is more sure. . In this case, the spacer 25 is interposed between the retaining rings 24 so that a space is provided at a position where the “nail 24a” engages on the inner peripheral surface of the water pipe, and the load is not concentrated on the water pipe. Is preferred. Furthermore, when the retaining ring 24 is disposed on the circumferential surface of the inner cylinder 22 so as to be inserted closer to the water pipe connecting end than the water sealing seal 23, the retaining ring 24 is exposed to internal pressure in the water pipe. Structure. Therefore, when water is circulated through the inserted water pipe, the water stop pipe is engaged with the inner peripheral surface of the water pipe whose diameter has been expanded by the internal pressure, and the water pipe is in the joint body. Since it is possible to avoid close contact with the cylinder, even a water pipe having an internal pressure can be freely rotated together with the outer cylinder. In that case, it is particularly preferable that the retaining ring 24 is made of stainless steel having both “strong elasticity” and “not easily oxidized”.

  The “fastener 26” in the joint body 21 is engaged (or formed) closer to the water pipe connecting end than the retaining ring 24 on the circumferential surface of the inner cylinder 22, and the retaining ring 24 is rotatably fixed. To do. That is, in the present invention, the retaining ring 24 is made of an annular member having no slit portion (separating portion), which is inserted from the end portion of the joint main body 21, so that the position is maintained. More specifically, as shown in FIG. 3, an outer surface screw is formed at the end of the inner cylinder 22 on the water pipe connecting side, and an inner surface screw that can be screwed to the outer surface screw is formed in the fastener 26. Alternatively, as shown in FIG. 7, an inner surface thread is formed on the inner peripheral surface of the inner tube 22 on the water pipe connection side, and an outer surface screw that can be screwed to the inner surface screw is formed on the fastener 26. Thus, it is preferable to screw them together. By adopting such a configuration, since the annular retaining ring 24 can be inserted from the threaded end portion of the inner cylinder 22 with the fastener 26, the joint 100 can be easily assembled. It should be noted that the degree of screwing of the fastener 26 needs to be such that no play occurs in the retaining ring 24 and no pressing force is exerted on the retaining ring 24. Further, when a synthetic resin spacer (or washer) is interposed between the retaining ring 24 and the fastener 26, the friction received by the retaining ring 24 can be reduced. This is effective because the rotation of the retaining ring 24 can be lightened.

  The “pressing member 27” in the joint body 21 is disposed between the water stop seal 23 and the retaining ring 24 on the circumferential surface of the inner cylinder 22, and “breaks” and “ This is to prevent turning up. More specifically, after the small-diameter portion 22c has entered the inside of the water pipe to be connected, the large-diameter portion 22a comes into contact with the end surface of the water pipe, and is driven by the insertion of the water pipe. Then, the outer peripheral surface of the water-stopping seal 23 is brought into close contact with the inner peripheral surface of the water pipe. Specifically, a tapered shape (having a large-diameter portion 22a having an outer diameter larger than the inner diameter of the water pipe inserted into the joint body 21 and a small-diameter portion 22c having an outer diameter smaller than the inner diameter of the water-flow pipe ( It is preferable that the structure is a trumpet shape. With such a configuration, even if the cut surface of the water pipe is slightly inclined or distorted, the pressing member 27 can be allowed to enter the water pipe without exception. More specifically, it is conceivable that the metal flat plate is formed into a cylindrical shape, and the diameter is increased by pressing from one opening of the cylindrical member 11 to form a tapered shape. If the outer peripheral surface of the water stop seal 23 is formed into a tapered shape so that “breakage” and “turn-up” of the water stop seal 23 can be avoided even when the water pipe is inserted, the “pressing” It is added that the member 27 "is not necessarily provided.

  And the "guide member 28" in the joint main body 21 is provided adjacent to the small diameter portion 22c side of the pressing member 27 on the circumferential surface of the inner cylinder 22, and the inner diameter of the end portion of the inserted water pipe is set to the small diameter. The diameter is larger than the outer diameter of the portion 22c. That is, by expanding the diameter of the water pipe before the end of the water pipe inserted into the joint body 21 reaches the pressing member 27, the small-diameter portion 22c of the pressing member 27 smoothly enters the water pipe. It is. In the present invention, the guide member 28 is made of synthetic resin, and when this is interposed between the pressing member 27 and the retaining ring 24, the friction received by the retaining ring 24 can be reduced. The rotation of the retaining ring 24 can be reduced, which is effective.

Among the embodiments described above, a preferred embodiment will be described below.
1 to 6 show a joint 100 according to the first embodiment. 1 is an exploded perspective view of a joint 100 according to the present embodiment, FIG. 2 is a side view of the joint 100 according to the present embodiment, and FIGS. 3 to 6 are cross-sectional views of the joint 100 according to the present embodiment. It is.

  As shown in FIG. 1 or FIG. 2, the joint 100 according to the present embodiment includes an outer cylinder 10 including a cylindrical member 11, an engagement part 12, and an opening window 13, a screwed part 21, an inner cylinder 22, and water stoppage. The joint body 21 including the seal 23, the retaining ring 24, the spacer 25, the fastener 26, the pressing member 27, and the guide member 28 is integrally assembled.

  First, in the present embodiment, the outer cylinder 10 is provided with a portion facing the water-stop seal 23 and the retaining ring 24 so as to be rotatable in the circumferential direction with respect to the joint body 21 via the engaging portion 12. The outer cylinder 10 is formed of most of the cylindrical member 11 with bronze, and the portion having the opening window 13 and the engaging portion 12 (that is, the joint end portion with the joint body 21) is a super engineering plastic. It is formed of a kind of polyphenylene sulfide (PPS), and these parts are assembled together. The form shown in FIG. 1 and the form shown in FIG. 2 differ in the shape of the joint end portion of the “outer cylinder 10” with the joint body 21, but these are only differences in design. Specifically, in the form shown in FIG. 1, three "opening windows 13" are formed on the circumference, and three "engagement protrusions 12a" are formed on the inner peripheral surface. It is made by projecting. On the other hand, in the form shown in FIG. 2, the “opening window 13” is formed on the circumference in two large and small portions (for convenience, four locations), and the annular “engagement protrusion 12a” is formed on the inner peripheral surface. Is formed by protruding one place.

  The “screw-in part” corresponding to the joint body 21 and the “inner cylinder 22” are integrally formed of bronze. In order to easily connect the screwed portion 21 to a device (not shown) such as a header (water separator), a “hex nut” is formed in the immediate vicinity of the screwed portion 21. The inner cylinder 22 includes a “large diameter portion 22a”, a “medium diameter portion 22b”, and a “small diameter portion 22c”. A straight groove is formed on the outer peripheral surface of the large diameter portion 22a to form an “engaged portion 22d”. ”, A double groove 22e is formed on the outer peripheral surface of the medium diameter portion 22b, and the“ water-stop seal 23 ”can be disposed, and a screw groove is formed at the end of the small diameter portion 22c to form the“ pressing member 27 ”. The "guide member 28", the "prevention ring 24" and the "spacer 25" are inserted, and the "fastener 26" can be screwed together. In the present embodiment, the outer diameter of the “groove 22e” portion in the medium diameter portion 22b and the outer diameter of the small diameter portion 22c are substantially the same.

  Further, in this embodiment, the water-stop seal 23 is formed of a circular O-ring formed of synthetic rubber and is disposed in two grooves 22e formed in the middle diameter portion of the inner cylinder 22, respectively. Is. Of these two O-rings, the pressing member 27 is inserted and arranged so as to cover the outer periphery of the O-ring on the connection end side. The pressing member 27 is composed of a tapered tubular member 11 formed of stainless steel. A guide member 28 is provided adjacent to the small diameter portion 22c of the pressing member 27. This guide member 28 is made of synthetic resin, and reduces the rotational resistance of the retaining ring 24 provided adjacent to the connecting end side of the guide member 28. The retaining ring 24 is made of an annular member (without a separating portion), and has a plurality of “claws 24a” that can engage with the inner peripheral surface of the water pipe P radially on the outer periphery of the annular member. The claw 24a is erected obliquely in the insertion direction of the water pipe P to be connected, and after the water pipe P is inserted, it engages with the inner peripheral surface of the water pipe P so that it cannot be removed. It becomes. Two retaining rings 24 are arranged with a spacer 25 in between, and a thread groove formed at the end of the small-diameter portion 22c so that the retaining ring 24 on the connecting end side of the two retaining rings 24 is not detached. The fasteners 26 are screwed together. By screwing the fastener 26, the pressing member 27, the guide member 28, the retaining ring 24, and the spacer 25 are inserted into the inner tube 22 of the joint main body 21, and the integrated state is maintained.

Subsequently, a use state of the joint 100 according to the present embodiment will be described with reference to FIGS. 3 to 6.
First, FIG. 3 shows a cross section taken along line AA of the joint 100 shown in FIG. 2, and is a state where the water pipe P has not yet been inserted. Next, FIG. 4 is a diagram illustrating a state in which the insertion of the water pipe P into the joint 100 illustrated in FIG. FIG. 5 shows a state where the insertion of the water pipe P into the joint 100 shown in FIG. 4 is completed, and a state where water is not yet circulated in the water pipe P. 6 shows a state in which water is circulated through the water pipe P inserted through the joint 100 shown in FIG. 5, internal pressure is generated in the water pipe P, and the diameter of the water pipe P is expanded in the joint 100. It is a thing.

  More specifically, in the state shown in FIG. 6, the diameter of the water pipe P is increased by the internal pressure, so that the outer peripheral surface of the water pipe P is in close contact with the inner peripheral surface of the outer cylinder 10. The inner peripheral surface of the water pipe P is separated from the outer peripheral surface of the inner cylinder 22. Therefore, according to the joint 100 according to the present embodiment, even if the connected water pipe P is expanded in diameter by the internal pressure, the water pipe P can be rotated. Therefore, it is possible to eliminate the “twist” of the water pipe P discovered after the water is circulated.

  Subsequently, Example 2 of the present invention will be described. Since most of the configuration of the joint 100 according to the present embodiment is the same as that of the first embodiment, particularly different features are described, and descriptions of common portions are omitted. 7 to 9 show a cross section of the joint 100 according to the second embodiment.

  In the present embodiment, the joint body 21 forms an inner surface screw on the inner peripheral surface of the inner tube 22 at the end of the water pipe connection side, and an outer surface screw that can be screwed to the inner surface screw on the fastener 26 (so-called “hollow” Bolts "are formed and screwed together.

  Subsequently, Example 3 of the present invention will be described. Since most of the configuration of the joint 100 according to the present embodiment is the same as that of the first embodiment, particularly different features are described, and descriptions of common portions are omitted. 10 to 12 show a cross section of the joint 100 according to the third embodiment.

  In this embodiment, the “screw-in part” and the “inner cylinder 22” corresponding to the joint body 21 are formed of bronze as separate members, and the outer surface of the tip of the inner cylinder 22 with respect to the screw hole opening provided in the screw-in part. The screw part is screwed and integrated. An O-ring 29 is interposed between the “screwed portion” and the “inner cylinder 22” to prevent water leakage between the two members.

  Further, in this embodiment, the water-stop seal 23 is not an O-ring having a circular cross section in the first embodiment, but an O-ring having a substantially trapezoidal outer periphery in a tapered shape. ”And“ turning up ”are avoided. For this reason, in this embodiment, a configuration is adopted in which the pressing member 27 for preventing the waterproof seal 23 from being broken and turned up is not provided. In addition, the “water seal 23” in the present embodiment is disposed closer to the connection end than the “prevention ring 24”. Therefore, the retaining ring 24 in the joint 100 according to the present embodiment is not exposed to the internal pressure (water pressure) in the water conduit. However, even in such a configuration, the diameter of the water pipe P is increased by the internal pressure in the vicinity of the water stop seal 23, and the outer peripheral surface of the water pipe P is in close contact with the inner peripheral surface of the outer cylinder. Therefore, according to the joint 100 according to the present embodiment in which the outer cylinder 10 is rotatably engaged with the joint body 21, the water pipe P is rotated even when the internal pressure is generated in the water pipe P. It becomes possible.

1 is an exploded perspective view of a joint 100 according to Embodiment 1. FIG. It is a side view of the coupling 100 shown in FIG. It is the sectional view on the AA line of the coupling 100 shown in FIG. It is a figure which shows the state which started insertion of the water flow pipe P with respect to the coupling 100 shown in FIG. It is a figure which shows the state which the insertion of the water pipe P with respect to the coupling 100 shown in FIG. 4 was completed. FIG. 6 is a view showing a state in which water is circulated in a water pipe P inserted through the joint 100 shown in FIG. 5, an internal pressure is generated in the water pipe P, and the diameter of the water pipe P is expanded in the joint 100. 6 is a cross-sectional view of a joint 100 according to Example 2. FIG. It is a figure which shows the state which the insertion of the water pipe P with respect to the coupling 100 shown in FIG. 7 was completed. FIG. 9 is a view showing a state in which water is circulated in the water pipe P inserted through the joint 100 shown in FIG. 8, internal pressure is generated in the water pipe P, and the diameter of the water pipe P is expanded in the joint 100. 6 is a cross-sectional view of a joint 100 according to Example 3. FIG. It is a figure which shows the state which the insertion of the water pipe P with respect to the coupling 100 shown in FIG. 10 was completed. FIG. 12 is a view showing a state in which water is circulated through the water pipe P inserted through the joint 100 shown in FIG. 11, internal pressure is generated in the water pipe P, and the diameter of the water pipe P is expanded in the joint 100.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Outer cylinder 11 Cylindrical member 12 Engagement part 12a Engagement protrusion 13 Opening window 21 Joint main body 22 Inner cylinder 22a Large diameter part 22b Medium diameter part 22c Small diameter part 22d Engagement part 22e Groove 23 Water stop seal 24 Extraction ring 24a Claw 25 Spacer 26 Fastener 27 Pressing member 28 Guide member 29 O-ring 100 Joint P Water pipe

Claims (10)

A joint body having an inner cylinder and an outer cylinder formed on the outer peripheral side of the inner cylinder, and an end portion of a flexible synthetic resin water pipe made of crosslinked polyethylene or polybden A joint for a synthetic resin water pipe that is inserted between a cylinder and an outer cylinder and has at least one connection port that is connected to the joint body in a non-removable and water-stopped state,
The inner cylinder is fitted with an annular water seal which is in close contact with the inner peripheral surface of the water pipe inserted into the connection port,
A plurality of claws that dig into the inner peripheral surface of the water pipe radially, and the claw bites into the inner surface of the water pipe in order to prevent the water pipe from being pulled out of the connection port, together with the water pipe An annular retaining ring that is rotatable in the circumferential direction around the inner cylinder is inserted,
The outer cylinder is
At its end, it has an engaging part that slidably engages with an engaged part provided in the joint body in the circumferential direction,
A joint for a synthetic resin water pipe, wherein the joint body is rotatably provided in a circumferential direction with respect to the joint body. The joint according to claim 1,
A joint for a synthetic resin water pipe, wherein the joint body and the inner cylinder are made of different members and are integrally formed by screwing them together. In the joint according to claim 1 or claim 2,
A joint for a synthetic resin water pipe, wherein the retaining ring that is externally inserted into the inner cylinder is disposed closer to the connection end than the water sealing seal that is externally fitted to the inner cylinder. In the joint according to any one of claims 1 to 3,
The retaining ring extrapolated to the inner cylinder is rotatably fixed by a fastener arranged at the connection end of the inner cylinder,
A thread groove is formed in the water pipe connecting end portion of the inner cylinder, and a thread groove that can be screwed to the thread groove is formed in the fastener, and these are screwed to each other. Synthetic resin water pipe fittings. In the joint according to any one of claims 1 to 4,
A joint for a synthetic resin water pipe, wherein the outer tube is provided with an opening window for viewing the insertion position of the water pipe. In the joint according to any one of claims 1 to 5,
A joint for a synthetic resin water pipe, characterized in that the connecting portion of the outer cylinder with the joint body is made of synthetic resin. In the joint according to any one of claims 1 to 5,
The outer tube is formed of a synthetic resin, and is a synthetic resin water pipe joint. In the joint according to any one of claims 1 to 7,
A joint for a synthetic resin water pipe, wherein the joint body has a screw-in portion that can be connected to a header or a water heater. In the joint according to any one of claims 1 to 7,
A joint body for a synthetic resin water pipe, wherein the joint body is formed integrally with a header or a water heater. In the joint according to any one of claims 1 to 7,
A joint for synthetic resin water pipes, characterized in that each of the connection ports according to the number of water pipes to be connected has an inner cylinder and an outer cylinder.

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