JP2001271979A - Pipe guide, pipe fixture having the pipe guide, and pipe joint having the pipe fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe guide capable of smoothly inserting an inner cylinder 35 in a pipe even when an insertion space between a fastening ring 7 and the inner cylinder 35 is small, and to provide a pipe fixture having the pipe guide and a pipe joint having the pipe fixture. SOLUTION: A pipe joint 1 consists of a pipe guide 5 formed in a closed-end cylindrical stat and comprising a bottom 50 having a insertion hole 50a formed in size to enable the insertion of the inner cylinder part 35, and a cylindrical side 52 to protect a pipe from contact with the fastening ring 7 by covering the outer peripheral surface of the pipe. When the pipe is mounted on the pipe joint 1, mounting is effected such that the inner cylinder 35 is inserted in the pipe. In this case, since the pipe guide 5 is interposed between the pipe and the pipe fastening ring 7, the pipe and the fastening ring 7 are prevented from contact with each other, whereby the inner cylinder part 35 is smoothly inserted in the pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe guide for attaching a pipe to an inner cylinder so that the pipe does not contact a tightening ring, a pipe fixture provided with the pipe guide, and a pipe fixture. And a pipe joint comprising:

[0002]

2. Description of the Related Art Conventionally, an elastic pipe formed of an elastic material such as polyvinyl or polyvinyl chloride and a steel pipe formed of a highly rigid material such as steel are connected in a water supply facility or the like. There are pipe fittings, such as pipe fittings,
For example, there is a pipe joint described in JP-A-10-110870.

FIG. 4 is a cross-sectional view of a pipe joint 100 described in this publication. As shown in FIG. 4, the pipe joint 100 has a nut portion 110 used when a steel pipe is attached.
A pipe fixture 200 for fixing the elastic pipe A and a pipe fixture 300 for fixing the steel pipe B are provided on each side in the thickness direction of the pipe. The pipe fixture 200 includes an inner cylinder 210, an outer cylinder 220, and a clamp. It comprises an attachment ring 230 and a cap 240.

[0004] The inner cylinder 210 of this pipe fixture 200 is
One side of the nut portion 110 in the thickness direction is erected so that the center of the cylinder coincides with the rotation center of the nut portion 110,
A communication hole 260 is formed that communicates with the elastic pipe A and the pipe fixture 300 and serves as a liquid flow path. The outer cylinder 220 is integrally formed concentrically with the inner cylinder so as to form a storage hole 222 through which the pipe wall of the elastic pipe A can be inserted between the outer cylinder 220 and the outer peripheral surface of the inner cylinder 210.

[0005] The fastening ring 230 is
It is arranged on the pipe mounting side for attaching the elastic pipe A to the inner cylinder 210, is formed so as to be able to be reduced in the radial direction, and has an inner peripheral surface for retaining the elastic pipe A attached to the inner cylinder 210. A pull-out preventing claw 232 is provided. The cap 240 is formed to have a size capable of housing the tightening ring 230, and to house the tightening ring 230 from the pipe mounting side, insert the outer cylinder 220, and screw with the outer cylinder 220.

The outer peripheral surface of the tightening ring 230
The first tapered portion 23 formed in a pointed shape from the base end side where the inner cylinder 210 is attached to the nut portion 110 toward the pipe attachment side where the elastic pipe A is attached.
4 is formed, and a second tapered portion 244 is formed on the inner peripheral surface of the cap 240 along the first tapered portion 234, where the first tapered portion 234 abuts at a position where the tightening ring 230 is stored. Have been.

In order to attach the elastic pipe A to the pipe fixture 200 of the pipe joint 100 thus configured, the cap 240 is passed through the elastic pipe A and then inserted between the tightening ring 230 and the inner cylinder 210. By passing the elastic tube A through the space,
The inner cylinder 210 is inserted into the elastic tube A.

After that, the cap 240 previously attached to the elastic tube A is stored in the outer cylinder 2 by housing the tightening ring 230.
20, the first tapered portion 234 slides along the second tapered portion 244, and the tightening ring 230 contracts in the radial direction thereof, and the elastic pipe A attached to the inner cylinder 210.
Are fastened and fixed between the inner cylinder 210 and the fastening ring 230.

When the tightening ring 230 is tightened, the pull-out preventing claws 232 bite into the elastic tube A to prevent the elastic tube A from falling out of the inner tube 210.

[0010]

By the way, the pipe joint 10
In the case of 0, since the diameter of the tightening ring 230 cannot be increased more than necessary due to the demand for reducing the overall size, the insertion space is narrow, and the tightening ring as described above is used as a pipe material. Since the material having high frictional resistance is used for the inner tube 230,
When the elastic tube A is inserted into the insertion space, there is a problem in that the elastic tube A inserted into the insertion space is frictioned with the inner cylinder 210 and the tightening ring 230 and a very large force is applied.

[0011] Therefore, the present invention provides a method for reducing the insertion space,
It is an object of the present invention to provide a pipe guide capable of smoothly inserting an inner cylinder into a pipe, a pipe fixture provided with the pipe guide, and a pipe joint provided with the pipe fixture.

[0012]

Means for Solving the Problems and Effects of the Invention According to the present invention for achieving the above object, an inner cylinder having a communication hole serving as a liquid flow path is inserted into a pipe made of an elastic material. A pipe connecting operation for covering the outer peripheral surface of the pipe in which the inner cylinder is inserted with the tightening ring, clamping the pipe between the inner cylinder and the pipe, and connecting the pipe and the inner cylinder in a liquid-tight manner. A pipe guide used in
During the operation of inserting the inner cylinder into the pipe, it covers the outer peripheral surface of the tip portion of the pipe, moves together with the pipe,
Protect the pipe from contacting the tightening ring, and when the operation of inserting the inner cylinder into the pipe is completed,
The fastening ring is formed to allow contact with the pipe, and is made of a material (for example, a metal material) having a smaller coefficient of friction with the pipe than the pipe.

When the pipe guide of the present invention is used, even if the insertion space for inserting the pipe between the tightening ring and the inner cylinder is narrow, when the pipe is mounted on the inner cylinder, the distance between the pipe and the tightening ring is reduced. Since the pipe guide is interposed in the pipe, it can be mounted without contact between the pipe and the tightening ring.In addition, the pipe guide has a smaller frictional resistance to the tightening ring than the pipe, and Even if it comes into contact with the attached ring, it moves smoothly, so that the pipe can be smoothly attached to the inner cylinder.

The pipe guide of the present invention has a bottom surface having an insertion hole sized to allow the inner tube to be inserted therein, and a pipe guide for inserting the inner tube into the pipe. Covers the outer peripheral surface of the tip portion, protects the pipe from contacting the tightening ring, and allows the tightening ring to come into contact with the pipe when the insertion of the inner cylinder into the pipe is completed. It is formed in the shape of a bottomed cylinder consisting of a cylindrical side surface formed as described above, is fitted into the pipe, and is moved together with the pipe by being pushed by the pipe during the operation of inserting the inner cylinder into the pipe. Are preferred.

Further, as the tightening ring, a ring provided with a pull-out preventing claw for preventing the pipe from falling out of the inner cylinder is preferably provided on the inner peripheral surface. As described above, even when the tightening ring has the pull-out preventing claw, the pipe guide of the present invention prevents the contact between the tightening ring and the pipe, so that the pipe can be smoothly held without being caught by the pull-out preventing claw. Can be attached to the inner cylinder.

Next, an inner cylinder having a communication hole serving as a liquid flow path is formed, and the pipe is inserted into the inner cylinder and covers the outer peripheral surface of the pipe formed of an elastic material. A pipe fixing device comprising: a clamping ring for clamping the pipe and the inner cylinder in a liquid-tight manner;
It is preferable to provide any of the pipe guides described above.

This is because, if the pipe guide of the present invention is provided like this pipe fixture, the operation of fixing the pipe can be performed efficiently. Further, in the case of a pipe joint, a pipe joint formed with a fixture having the above-described pipe guide is preferable in terms of improving work efficiency.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A pipe joint provided with a pipe guide according to one embodiment of the present invention will be described below. Here, FIG. 1 is a longitudinal sectional view of the pipe joint, and FIG. 2 is a transverse sectional view of the pipe joint.
2A is a cross-sectional view taken along the line AA ′ of FIG. 1, and FIG. 2B is a cross-sectional view taken along the line BB ′.

Hereinafter, the inner cylindrical portion 35 constituting the pipe joint 1 will be described.
From the base end side attached to the nut portion 30.
The direction toward the pipe mounting side for mounting the elastic pipe A on 5 is referred to as the upright direction, and the opposite direction is referred to as the mounting direction. As shown in FIG. 1, the pipe joint 1 of the present embodiment includes a pipe joint body 3, a pipe guide 5, a tightening ring 7, and a cap 9.

The pipe joint body 3 includes a nut 30
, An inner cylindrical portion 35, an outer cylindrical portion 40, and a steel pipe fixing portion 45, which are integrally formed. The pipe joint 1 has a communication hole 10 serving as a liquid flow path, and the communication hole 10 penetrates from the inner cylindrical portion 35 through the nut portion 30 to the steel pipe fixing portion 45.

Hereinafter, the pipe joint body 3 will be described first. First, the nut portion 30 has a hexagonal cross section perpendicular to the upright direction in order to engage a wrench or the like. The inner cylindrical portion 35 is formed upright on a side surface perpendicular to the thickness direction of the nut portion 30 so that the communication hole 10 is formed in a cylindrical shape penetrating the center of the cylindrical portion, and the cylindrical center coincides with the rotation center of the nut portion 30. ing. An installation groove 350 for installing the packing 37 is provided around the outer peripheral surface of the inner cylindrical portion 35. The packing 37 is configured to be thicker than the depth of the installation groove 350, and when installed in the installation groove 350, is protruded from the outer peripheral surface of the inner cylindrical portion 35.
Hereinafter, the position where the packing 37 is installed is referred to as a packing mounting position.

The outer cylindrical portion 40 is formed in a cylindrical shape surrounding the outer peripheral surface of the inner cylindrical portion 35, and is provided between the outer cylindrical portion 40 and the outer peripheral surface of the inner cylindrical portion 35.
The nut portion 30 is erected on the side surface in the thickness direction so as to form a storage hole 400 that is open toward the erection direction and that can store the pipe guide 5. An external thread 402 for screwing the cap 9 is formed on the outer peripheral surface.

The steel pipe fixing portion 45 is formed in a cylindrical shape, and has a cylindrical center on a side surface perpendicular to the thickness direction of the nut portion 30 opposite to the side surface to which the inner cylindrical portion 35 and the outer cylindrical portion 40 are attached. It stands up so as to coincide with the rotation center of the nut portion 30. The outer peripheral surface is formed in a tapered shape that is pointed toward the mounting direction, and has a thread 450 for screwing the steel pipe B.

Next, the pipe guide 5 is provided with a bottom surface 50 having an insertion hole 50a formed in a size that allows the inner cylindrical portion 35 to be inserted, and an erect direction from the outer peripheral edge of the bottom surface 50 in the erect direction. The elastic tube A is attached to the inner cylindrical portion 35 and has a bottomed cylindrical shape including a cylindrical side surface 52 having a size capable of covering the outer peripheral surface of the elastic tube A. The pipe guide 5 is made of metal, and its side surface is smoothly processed to reduce frictional resistance with the tightening ring 7. The pipe guide 5 is disposed at a packing installation position, and an insertion space 54 into which the pipe wall of the elastic pipe A is inserted between the side surface 52 of the pipe guide 5 and the outer peripheral surface of the inner cylindrical portion 35. Is formed.

Next, as shown in FIG. 2B, the tightening ring 7 is provided with a contraction notch 70, and a cross section perpendicular to the upright direction is formed in a C-shape. By changing the interval between the portions 70, the portions 70 can be contracted in the radial direction. The tightening ring 7 is installed in a state of being wound around the side surface 52 of the pipe guide 5, and
Has a resiliency that reduces in the radial direction when it comes off the fastening ring 7. As shown in FIG.
As shown in FIG. 3, a pull-out preventing claw 72 is formed to prevent the elastic tube A (see FIG. 3) from falling out of the inner cylindrical portion 35. The formed first tapered portion 74 is formed. Before the elastic tube A is attached to the inner cylindrical portion 35, the tightening ring 7 is disposed at a position where the end surface in the mounting direction of the tightening ring 7 abuts on the end surface in the standing direction of the outer cylindrical portion 40. Is done.

Next, the cap 9 is formed in a hollow cylindrical shape capable of storing the tightening ring 7. Both ends of the cap 9 are opened, and an outer cylindrical portion 40 is provided on the inner peripheral surface on the mounting direction side.
A female thread 94 for storing and screwing is formed, and a second tapered portion 96 formed in a shape along the first tapered portion 74 is formed on the inner peripheral surface on the upright direction side. .

In the cap 9, the portion where the second tapered portion 96 is formed is formed to be thicker than the portion where the female screw thread 94 is formed. A step 98 is formed. This step 9
Reference numeral 8 has a step which abuts on the end face in the standing direction of the tightening ring 7 at the packing installation position with the pipe guide 5 interposed therebetween.

An elastic pipe A and a steel pipe B are connected to the pipe joint 1 configured as described above, as shown in FIG. The procedure for such connection will be described below. FIG. 3 is a longitudinal sectional view showing a use state of the pipe joint 1. First, in order to attach the steel pipe B to the pipe joint 1, since a screw thread that can be screwed with the screw thread 450 is formed on the inner peripheral surface of the steel pipe B, the screw thread is screwed with the screw thread 450. It is attached to the steel pipe fixing part 45. At this time, the outer peripheral surface of the steel pipe fixing portion 45 is formed in a tapered shape that is pointed toward the standing direction.
The steel pipe B is screwed together while widening. For this reason, since a large force is required to attach the steel pipe B to the pipe joint 1, the nut section 30 is rotated and attached with a wrench or the like. As described above, since the steel pipe B is attached to the pipe joint 1 with its tip widened, the steel pipe B is liquid-tightly and securely fixed to the pipe joint 1.

On the other hand, in order to attach the elastic pipe A to the pipe joint 1, as shown in FIG. 1, the pipe guide 5 and the tightening ring 7 are arranged at the packing attachment position, and the cap 9 is removed in a state where these are stored. It is screwed into the tube part 40. At this time, since the tightening ring 7 is sandwiched between the end face of the outer cylinder portion 40 in the standing direction and the stepped portion 98 of the cap 9, the cap 9 has a part of the internal thread 94 in the standing direction, which is a male screw. It cannot be screwed from the position where it is screwed to a part of the insertion side of the mountain 402 toward the mounting direction, and is mounted to the outer tube 40 in this state. Hereinafter, this state is called a preparation stage.

Next, in order to attach the elastic tube A to the inner tube 35, the elastic tube A is pushed in the mounting direction so that the inner tube 35 is inserted into the elastic tube A. Then, first, the elastic tube A
Of the insertion space 5 while squeezing the packing 37
4 and the elastic tube A inserted in the insertion space 54
Is covered with the side surface 52.

Further, when the elastic pipe A is pushed in the mounting direction, the pipe guide 5 slides together with the elastic pipe A in the mounting direction, and is finally completely housed in the storage hole 400. Deviate from 7. Then, the fastening ring 7 contracts in the radial direction and presses against the outer peripheral surface of the elastic tube A. Thus, the tightening ring 7 does not touch the elastic pipe A until the pipe guide 5 is completely stored in the storage hole 400, as well as the elastic pipe A inserted into the insertion space 54. .

When the pipe guide 5 is stored in the storage hole 400, the tightening ring 7 contracts in the radial direction and is pinched between the step 98 and the end face of the outer cylinder 40 in the upright direction. The previously tightened ring 7 comes off, and the first tapered portion 74 can be brought into contact with the second tapered portion 96. Then, the cap 9
However, the first tapered portion 74 slides on the second tapered portion 96 when it can be inserted in the mounting direction further than the position in the preparation stage. Then, the tightening ring 7 is further contracted in the radial direction as shown in FIG. 3, and the elastic tube A is clamped between the tightening ring 7 and the inner cylindrical portion 35 to be tightened. Are fixed while preventing the elastic tube A from getting into the inner cylindrical portion 35 by biting into the elastic tube A. At this time, since the inner cylindrical portion 35 and the elastic tube A sandwich the packing 37, they are connected in a liquid-tight manner.

Using the pipe joint 1 described above has the following effects. When the pipe guide 5 of the present embodiment is used, even when the insertion space for inserting the elastic tube A between the tightening ring 7 and the inner tube portion 35 is narrow, when the elastic tube A is attached to the inner tube portion 35, Since the pipe guide 5 is interposed between the elastic pipe A and the tightening ring 7, the elastic pipe A and the tightening ring 7 can be attached without contact, and the pipe guide 5 is made of metal. Because of this, the frictional resistance of the pipe guide 5 against the tightening ring 7 is smaller than that of the elastic pipe A, and the pipe guide 5 moves smoothly even when it comes into contact with the inner peripheral surface of the tightening ring 7. 35 can be attached smoothly.

Further, if the pipe guide 5 of this embodiment is used, the elastic tube A can be attached without being hooked on the pull-out preventing claw 72, so that the elastic tube A can be attached more smoothly to the inner cylindrical portion 35. . Further, when the pipe joint 1 of the present embodiment is used, the elastic pipe A can be smoothly attached to the inner cylindrical portion 35, so that the work efficiency of connecting the pipes such as the elastic pipe A and the steel pipe B can be improved. .

In this embodiment, the pipe joint 1 for connecting the elastic pipe A and the steel pipe B has been described. However, in the case of a pipe joint for connecting the elastic pipes A, the steel pipe fixing part 45 is replaced with the inner pipe part. It is sufficient to use a pipe joint to which a pipe fixing tool including the outer tube portion 35, the tightening ring 7, the pipe guide 5, and the cap 9 is attached.

When connecting a plurality of elastic pipes A at one place, it is preferable to use a pipe joint having a plurality of pipe fixing members. Further, a pipe fixing tool may be used as a connecting tool for connecting the elastic pipe A to a water outlet such as a tank.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a pipe joint according to the present embodiment.

FIGS. 2A and 2B are cross-sectional views of the pipe joint of the present embodiment, in which FIG. 2A is a cross-sectional view taken along line AA ′ of FIG. 1 and FIG. 2B is a cross-sectional view taken along line BB ′ of FIG.

FIG. 3 is a longitudinal sectional view illustrating a use state of the pipe joint of the present embodiment.

FIG. 4 is a longitudinal sectional view of a conventional pipe joint.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pipe joint, 3 ... Pipe joint body, 5 ... Pipe guide, 7 ...
Tightening ring, 9 cap, 10 communication hole, 30 nut part, 35 inner cylinder part, 37 packing, 40 outer cylinder part,
45: steel pipe fixing portion, 50: bottom surface, 50a: insertion hole, 52
... side surface, 54 ... insertion space, 70 ... shrinkage notch, 72 ... pull-out prevention claw, 74 ... first taper part, 94 ... internal thread, 96 ...
2nd taper part, 98 ... step part, 350 ... installation groove, 400
... storage holes, 402 ... male threads, 450 ... threads

Claims (4)

[Claims] 1. An inner cylinder provided with a communication hole serving as a liquid flow path is inserted into a pipe made of an elastic material, and a fastening ring covers an outer peripheral surface of the pipe into which the inner cylinder is inserted. A pipe guide used in a pipe connection operation for liquid-tightly connecting the pipe and the inner cylinder with each other by clamping the pipe between the inner cylinder and the inner cylinder. During operation, cover the outer peripheral surface of the tip portion of the pipe, move with the pipe,
Protect the pipe from contacting the tightening ring, and when the operation of inserting the inner cylinder into the pipe is completed,
A pipe guide, wherein the tightening ring is formed to allow contact with the pipe, and is made of a material having a smaller coefficient of friction with the pipe than the pipe. 2. A bottom surface having an insertion hole formed to have a size that allows insertion of the inner cylinder, and an outer peripheral surface of a tip portion of the pipe during an operation of inserting the inner cylinder into the pipe, Protect the pipe from contacting the tightening ring, and when the insertion of the inner cylinder into the pipe is completed, a cylindrical side surface formed to allow the tightening ring to contact the pipe. The inner cylinder is formed into a bottomed cylindrical shape, is fitted into the pipe, and is moved together with the pipe by being pushed by the pipe during the operation of inserting the inner cylinder into the pipe. 2. The pipe guide according to 1. 3. An inner cylinder having a communication hole serving as a liquid flow path, and said pipe inserted between said inner cylinder and covering an outer peripheral surface of a pipe formed of an elastic material and being connected between said inner cylinder and said inner cylinder. A pipe fixing device comprising: a clamping ring which clamps and clamps the liquid supply between the pipe and the inner cylinder in a liquid-tight manner, comprising the pipe guide device according to claim 1. . 4. A pipe joint comprising at least one pipe fixing tool according to claim 3.