JP5300539B2 - Pipe fittings - Google Patents

Description

  The present invention relates to a pipe joint, and more particularly to a pipe joint in which an inserted pipe can be easily removed.

  A resin pipe used as a pipe for water supply or hot water supply is connected to another pipe via a pipe joint. As this pipe joint, for example, Patent Document 1 discloses a collet that holds a pipe by biting a claw into the outer peripheral surface of the pipe, an O-ring that adheres to the outer peripheral surface of the pipe to prevent water leakage, and a cap that covers the joint body. In addition, a pipe joint that has improved durability by using a resin with extremely high impact resistance strength for the collet has been proposed.

  By the way, in the construction of water supply or hot water supply piping in a house or the like, if the pipe inserted into the pipe joint is mistakenly attached, it is necessary to remove the pipe once. However, in order to remove the pipe from the conventional pipe joint described above, it is necessary to disassemble the pipe joint by removing the collet after removing the cap. As described above, when a pipe attachment error occurs at the construction site, it takes time to disassemble and assemble the pipe joint, so that the work efficiency is lowered. In addition, when priority is given to work efficiency, pipes and pipe joints that are incorrectly installed may be discarded.

  Therefore, as a conventional technique capable of removing the pipe without disassembling the pipe joint, for example, Patent Document 2 discloses a joint body, an O-ring, a collet that is pressed against the outer peripheral surface of the pipe and holds the pipe, and a pipe. A pipe joint is proposed which has a lock ring that holds the pipe by biting the outer peripheral surface of the pipe, a release ring that releases the pipe holding of the collet and lock ring, a cover ring, and a sleeve that covers these members. ing.

  Patent Document 3 proposes a pipe joint including a joint body, an O-ring, a lock ring, and a release ring that has a collet function by releasing a slit and releases a pipe holding the lock ring. Has been.

JP 2001-74178 A JP 2001-304476 A JP 2003-4187 A

  However, in the above-described conventional pipe joint, a certain amount of force is required to release the claw portion of the lock ring, which is an urging member, and a simpler structure is required for reliable removal of the pipe.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to propose a pipe joint that securely fixes an inserted pipe and also reliably removes the pipe.

That is, the gist of the present invention is as follows.
(1) a cylindrical joint body having an insertion portion for inserting a pipe therein;
A cap attached to the outer surface of the joint body on the pipe insertion opening side;
A sealing material interposed between the pipe inserted into the insertion portion and the joint body;
A collet that is provided closer to the cap than the sealing material, has a plurality of claws that engage the outer peripheral surface of the pipe to be inserted and grip the pipe, and can be expanded and contracted;
A release ring for expanding the diameter of the collet;
A pipe joint comprising:
The collet has a plurality of slits that open at the end on the cap side and extend in the axial direction of the joint body,
The release ring has at least one protrusion that extends in the axial direction of the joint body and fits into the plurality of slits at an end on the collet side.
A pipe joint characterized by that.

(2) The pipe joint according to (1), further including a support ring for restricting movement of the collet.

(3) The support ring has a flange portion protruding outward in the radial direction of the joint body, and the flange portion is sandwiched between the cap and the joint body so that the seal material is interposed between the seal material and the collet. The pipe joint according to (1) or (2), wherein the pipe joint is fixedly arranged.

(4) The plurality of slits of the collet have tapered portions inclined at a bottom surface in a direction in which the slit depth increases from the outer surface to the inner surface of the collet. The pipe joint according to any one of (3).

(5) Any one of the above (1) to (4), wherein a tapered portion is formed along the tapered portion provided on the bottom surface of the slit of the collet at the tip of the protruding portion of the release ring. Pipe joint as described in Crab.

(6) Any one of the above (1) to (5), wherein a tapered portion is formed on a side surface of the projecting portion of the release ring along a tapered portion provided on a side surface of the slit of the collet. Pipe joints as described in.

  In the pipe joint of the present invention, the pipe is gripped by a collet when the pipe is inserted, and the pipe can be securely fixed, and the pipe once inserted can be easily and reliably removed. Therefore, it is possible to improve work efficiency in piping construction and reduce pipe joint and pipe disposal loss.

It is sectional drawing of the pipe joint of this invention. It is an exploded sectional view of the pipe joint of the present invention. It is a figure which shows the collet and release ring of the pipe joint of this invention. It is sectional drawing of the pipe joint of this invention which inserted the pipe at the time of no load. It is sectional drawing of the pipe joint of this invention which inserted the pipe at the time of pressurization. It is sectional drawing of the pipe joint of this invention at the time of removing a pipe. It is a figure which shows the collet and release ring of the pipe joint of this invention.

Hereinafter, the present invention will be described in detail with reference to the drawings.
1 is a sectional view of a pipe joint of the present invention, FIG. 2 is an exploded sectional view of the pipe joint of the present invention, FIG. 3A is a perspective view of a release ring, and FIG. 3B is a perspective view of a collet. Indicates. The pipe joint 1 includes a joint body 10, a cap 20, an O-ring 30 that is a sealing material, a collet 40, a support ring 50, and a release ring 60. Details of these members will be described below with reference to FIGS.

Joint body 10 is cylindrical, internally, has an insertion portion for inserting the pipe to the other end (not shown) side from one end 10E ₁ side in the axial direction of the joint body 10. Pipe is inserted in the Y direction of the drawing, one end 10E ₁ side of the joint body 10 is a pipe insertion opening side.
A step portion 12 is provided on the inner wall near the center in the axial direction of the joint body 10, and an O-ring 30 is placed on the step portion 12. Moreover, the flange part 14 which protrudes in the radial direction inner side of the joint main body 10 is provided in the other end side of the axial direction of the joint main body 10, This flange part 14 serves as a stop part at the time of inserting a pipe into an insertion part. Used. Furthermore, from the one end 10E ₁ side of the joint body 10 to the vicinity of the step portion 12, the external thread 16 on the outer surface of the joint body 10 is formed.

The O-ring 30 has an annular shape, and is provided on the stepped portion 12 in the insertion portion so that the joint body 10 and the axial direction coincide with each other. The O-ring 30 is interposed between the pipe inserted into the insertion portion and the joint body 10. The inner diameter of the O-ring 30 is set to be smaller than the outer diameter of the pipe inserted into the insertion portion. When the pipe is inserted into the insertion portion, the radially inner surface of the O-ring 30 and the outer peripheral surface of the pipe are in close contact with each other, and the radially outer surface of the O-ring 30 and the inner surface of the joint body 10 are in close contact with each other. Thus, water leakage can be prevented by sealing the space between the pipe and the joint body 10 in a watertight manner.
In the illustrated example, one O-ring 30 is used, but two or more O-rings may be arranged in series in the insertion portion.

The support ring 50 has a cylindrical shape, and is provided on the pipe insertion opening side of the O-ring 30 so as to coincide with the joint body 10 in the axial direction. Support ring 50, the axial end 50E _1, having a first flange portion 52 projecting radially outwardly, the other end 50E _2, having a second flange portion 54 projecting radially inward.
By the first flange portion 52 is held between the end 10E ₁ cap 20 and the fitting body 10, the support ring 50 is fixedly disposed within the insertion portion. Note that the method of fixing and arranging the support ring 50 is not limited to this example, and the support ring 50 can be bonded and fixed to the inner surface of the joint body 10.
The second flange portion 54 is located between the O-ring 30 and the collet 40, and a stepped portion 56 is formed on the surface of the second flange portion 54 (on the main body side of the support ring 50 and opposite to the O-ring). Is formed. The step portion 56 prevents the pipe from being inserted into the pipe joint 1 when the collet 50 is assembled in the reverse direction.

The collet 40 has a cylindrical shape, and is provided on the insertion opening side of the second flange portion 54 of the support ring 50 so as to coincide with the joint body 10 in the axial direction. Collet 40 has one end 40E ₁ in the axial direction is located on the insertion opening side of the first flange portion 52 of the support ring 50, the other end 40E ₂ the first flange portion 52 of the support ring 50 and the second flange portion 54 Located between.
The collet 40 has a plurality of, in the illustrated example, six slits 44 that open at one end 40 E ₁ and extend in the axial direction of the joint body 10 in the circumferential direction of the collet 40 at a predetermined interval. The collet 40 can be expanded and contracted by opening and closing the slit 44. The shape of the slit is not limited to this illustrated example, and the number and shape can be selected as appropriate.
As shown in detail in FIG. 3, the slit 44 is inclined on the side surface (a surface substantially parallel to the axial direction of the joint body 10) so that the slit opening width increases from the outer surface to the inner surface of the collet 40. The tapered portions 44T ₁ and 44T ₂ are provided. Further, slit 44 has on its bottom surface, a tapered portion 44T ₃ inclined in the direction of the slit depth is increased toward the inner surface from the outer surface of the collet.
The collet 40 has a plurality of claw portions 42 projecting inward in the radial direction of the collet 40 on the inner surface of the portion between the slits 44. The claw portions 42 engage with the outer peripheral surface of the pipe to be inserted, and Grip. The claw portion 42 is inclined in a direction in which the inner diameter of the collet 40 narrows in the Y direction, and has a structure in which a leaf spring is covered with resin or a structure formed only of resin.
Collet 40 has a first tapered portion 46T on the outer surface of the end 40E ₁ of the collet 40. The first tapered portion 46T is inclined in a direction in which the outer diameter of the collet 40 increases in the Y direction, and can slide with respect to a tapered portion 22T provided on the cap 20 described later.
Collet 40 has a second tapered portion 48T on the inner surface of the end 40E ₁ of the collet 40. The second taper portion 48T is inclined in a direction in which the inner diameter of the collet 40 decreases in the Y direction, and is slidable with respect to a taper portion 64T provided on the release ring 60 described later.

The release ring 60 has a cylindrical shape, and is provided on the insertion opening side of the collet 40 so that the joint body 10 and the axial direction coincide with each other. The end face of the axial end 60E ₁ release ring 60, since it is easy to press this surface during a pipe withdrawal to be described later, is perpendicular to the axial direction of the joint body 10. Further, the other end 60E ₂ in the axial direction, which is the end portion on the collet 40 side, extends in the axial direction of the joint main body 10, and a plurality of the collet 40, in the example of FIG. At least one protrusion to be fitted, which is the same number of protrusions 62 as the slits 44 in the illustrated example, is provided. The number of the protrusions 62 is not limited to the illustrated example, but is preferably provided at equal intervals in the circumferential direction of the release ring 60, and can be formed, for example, every other slit 44. It is most preferable to provide the same number of protrusions 62 as the slits 44 as in the illustrated example.
A tapered portion 62T is formed at the tip of the protruding portion 62. The tapered portion 62T has a shape along the tapered portion 44T ₃ provided in the bottom portion of the slit 44 of the collet 40, it is slidable with respect to the tapered portion 44T _3.
Release ring 60 has a tapered portion 64T on the outer surface of the axial end 60E _2. The tapered portion 64T is inclined in a direction in which the outer diameter of the release ring 60 decreases in the Y direction, and is slidable with respect to the second tapered portion 48T of the collet 40.
The release ring 60 has a stepped portion 66 so as not to come out of the pipe joint 1 from the opening of the cap 20.

Cap 20 is cylindrical, opening at one end 20E ₁ in the axial direction is used as an insertion slot for inserting a pipe, the internal thread on the inner surface extending from the other axial end 20E ₂ side openings 26 is formed. By this internal thread 26 engaged with the male thread 16 formed on the outer surface of the end 10E ₁ side of the joint body 10, the cap 20 is made to coincide with the joint body 10 and the axially outer surface of the joint body 10 It is attached. Here, the one end 10E ₁ cap 20 and the fitting body 10 by clamping the first flange portion 52 of the support ring 50 to secure the support ring 50.
Further, the cap 20 is provided with a tapered portion 22T on the inner surface between the insertion port and the female screw 26. The tapered portion 22T is inclined in a direction in which the inner diameter of the cap 20 extends in the Y direction, and is slidable with respect to the tapered portion 46T provided in the collet 40.
The cap 20 has a stepped portion 28 that comes into contact with the stepped portion 66 of the release ring 60 so that the release ring 60 does not come out of the pipe joint 1.

Next, the effect | action of the pipe joint of this invention when a pipe is inserted is demonstrated using FIGS.
FIG. 4 shows a cross-sectional view of the pipe joint of the present invention in which a pipe without load is inserted. The no-load state is a state where water is not passed through the pipe P and no water pressure is applied to the pipe P and the pipe joint 1.
First, when the pipe P is inserted in the Y direction, the claw portion 42 of the collet 40 contacts the pipe P, and the collet 40 moves in the Y direction together with the pipe P. At this time, the other axial end 40E ₂ of the collet 40 is moved in the Y-direction abuts against the step portion 56 of the support ring 50 is restricted. In the configuration of the present invention, since the support ring 50 is fixedly disposed by the joint body 10 and the cap 20, the support ring 50 is not pushed and moved by the collet 40 when the pipe P is inserted. A space (house) for the O-ring 30 can be secured between the support ring 50 and the stepped portion 12. That is, when the support ring 50 is not fixed, if the collet 40 moves in the Y direction when the pipe P is inserted, the support ring 50 also moves in the Y direction, so that the support ring 50 crushes the O-ring 30. Become. As a result, the O-ring 30 bulges inward in the radial direction, which may cause a problem that it is difficult to insert the pipe P. In the present invention, since the O-ring 30 is not crushed, the problem that the pipe P is difficult to be inserted can be prevented.

FIG. 5 shows a cross-sectional view of the pipe joint of the present invention in which a pipe during pressurization is inserted. The time of pressurization is a state in which water is passed through the pipe P and water pressure is applied to the pipe P and the pipe joint 1.
When water pressure is applied to the pipe P and the pipe joint 1, the pipe P moves in the drawing direction (Y ′ direction). Then, the collet 40 also moves in the Y ′ direction together. At this time, the first tapered portion 46T of the collet 40 slides in the Y ′ direction with respect to the tapered portion 22T of the cap 20, and the collet 40 is reduced in diameter by narrowing the opening width of the slit 44. The force for gripping the pipe P is further increased, and the pull-out of the pipe P is reliably prevented.
Instead of pressurizing the pipe P, the gripping force of the pipe joint 1 can be increased by inserting the unloaded pipe P into the pipe joint 1 and then pulling the pipe P in the Y ′ direction. As described above, once the pipe P is inserted, when the force acts in the pulling direction of the pipe P, the claw portion 42 bites into the outer peripheral surface of the pipe P, so that the pulling out of the pipe P is prevented.

6 (a) and 6 (b) are cross-sectional views of the pipe joint half of the present invention when the pipe is removed. FIG. 6A shows the collet before diameter expansion, and FIG. 6B shows the collet after diameter expansion.
When removing the pipe P, a special jig or a driver for moving the release ring 60 is inserted from the gap between the cap 20 and the pipe P, and the release ring 60 is pushed in the Y direction. Then, the tip of the protrusion 62 of the release ring 60 comes into contact with the tapered portions 44T ₁ and T ₂ of the slit 44 of the collet 40 to increase the opening width of the slit 44, and the collet 40 is expanded in diameter as a first step. When the release ring 60 is further pushed in the Y direction, the tip of the protrusion 62 of the release ring 60 comes into contact with the tapered portion 44T ₃ of the slit 44 of the collet 40. When the release ring 60 is further pushed in the Y direction, the tip of the protrusion 62 pushes the tapered portion 44T ₃ of the slit 44, the collet 40 also moves in the Y direction, the step of the other end 40E ₂ support ring 50 of the collet 40 It abuts on the part 56.
Next, as shown in FIG. 6 (b), when pushed into the further Y-direction releasing ring 60, the tapered portion 62T of the release ring 60 slides radially inward against the tapered portion 44T ₃ of the slit 44. At this time, the opening width of the slit 44 of the collet 40 is further expanded, and the collet 40 is expanded in diameter as a second stage, and the fitting between the claw portion 42 and the outer peripheral surface of the pipe P is released. As a result, the pipe can be pulled out.
Incidentally, the taper portion 62T is at the same time as the slide with respect to the tapered portion 44T ₃ of slits 44, the other axial end 60E taper portion 64T collet 40 formed on the outer surface of the _second release ring 60 of the protrusion 62 It may be configured to slide relative to the second tapered portion 48T formed on the inner surface of the end 40E ₁ of.
Incidentally, one end 60E ₁ release ring 60, when located outside the insertion opening, it is easy to dismount operations of the pipe P described above. However, if it is considered that the pipe P is pulled by mistake, as in the illustrated example, one end 60E ₁ release ring 60 is preferably also from one end 20E ₁ of the cap 20 is on the insert part side.

Further, as shown in FIG. 7, tapered portions 62T ₁ and 62T ₂ along the tapered portions 44T ₁ and 44T ₂ provided on the side surfaces of the slits 44 of the collet 40 are formed on the side surfaces of the projecting portions 62 of the release ring 60. It is preferable that The tapered portions 62T ₁ and 62T ₂ play a role of expanding the slit 44 while sliding with respect to the tapered portions 44T ₁ and 44T ₂ .

When removing the pipe P in a conventional pipe joint, it was necessary to remove the cap and disassemble the pipe joint. Therefore, when a pipe is mistakenly inserted at a construction site, the pipe joint is disassembled and then a correct connection is made, or the wrong pipe and the pipe joint are discarded.
However, in the pipe joint 1 of the present invention, as described above, since the pipe P can be removed without disassembling the pipe joint 1, even when the pipe P is inserted and mistaken at the construction site, the pipe and the pipe joint It is possible to easily achieve correct connection without wasting. As a result, the waste of joints and pipes can be reduced, and at the same time, the contractor can perform the site connection work with high efficiency at ease.

1 pipe fittings 10 fitting body 12 stepped portion 16 external thread 14 flange portion 20 cap 22T tapered portion 26 internal thread 30 O-ring 40 collet 42 claw portion 44 slit _{44T 1, 44T 2, 44T 3} tapered portion 46T first tapered portion 48T first 60 release the ring 62 protrusions second flange portion 56 stepped portion 2 tapered portions 50 the support ring 52 first flange portion 54 62T tapered portion _62T 1, 62T ₂ tapered portion 64T tapered portion

Claims (6)

A cylindrical joint body having an insertion portion for inserting a pipe therein;
A cap attached to the outer surface of the joint body on the pipe insertion opening side;
A sealing material interposed between the pipe inserted into the insertion portion and the joint body;
A collet that is provided closer to the cap than the sealing material, has a plurality of claws that engage the outer peripheral surface of the pipe to be inserted and grip the pipe, and can be expanded and contracted;
A release ring for expanding the diameter of the collet;
A pipe joint comprising:
The collet has a plurality of slits that open at the end on the cap side and extend in the axial direction of the joint body,
The release ring has at least one protrusion that extends in the axial direction of the joint body and fits into the plurality of slits at an end on the collet side.
A pipe joint characterized by that.   The pipe joint according to claim 1, further comprising a support ring for restricting movement of the collet.   The support ring has a flange portion protruding outward in the radial direction of the joint body, and is fixedly disposed between the seal material and the collet by sandwiching the flange portion between the cap and the joint body. The pipe joint according to claim 1 or 2, characterized in that   The plurality of slits of the collet have a taper portion inclined at a bottom surface in a direction in which the slit depth increases from the outer surface to the inner surface of the collet. Pipe joints as described in.   The pipe joint according to any one of claims 1 to 4, wherein a taper portion is formed at a tip of the protrusion portion of the release ring along the taper portion provided on a bottom surface of the slit of the collet. .   The pipe joint according to any one of claims 1 to 5, wherein a taper portion is formed on a side surface of the protrusion portion of the release ring along a taper portion provided on a side surface of the slit of the collet.

Images