JPH07190271A - Resin pipe joint and connection method for pipe material - Google Patents

Abstract

PURPOSE:To improve sealability and prevent removal of a pipe material by forming a base end face of a core perpendicularly or in a reversed tapered form in respect to an axial direction. CONSTITUTION:A base end face 11B of a core 11 is formed perpendicularly to an axial direction. The core 11 is fitted into a core fitting widened and stepped portion 16 together with a pipe material 14. A box nut 13 is screwed with a joint main body 12. The base and face 11B is pressurized by a core pressurizing surface 23 of the box nut 13. The core 11 is thus press-fitted into the core fitting widened and stepped portion 16. An end face 11A is in press contact with a sealing surface 17 to form a first seal part. The end face 11A is in press contact with the sealing surface 17, so that a leading end of the core 11 is widened and an outer peripheral surface 11 is press-fitted to a tapered surface 18, to form a second seal part. The pipe material 14 is in press-contact with the pressurizing surface 23 of the box nut 13, and the base end face 11B serves as a third sealing part. A bent-back portion 31 is in press-contact with the tapered surface 18 by the repulsion generated at pressurization of the end of the pipe material 14, where sealing is perfomed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin pipe joint and a pipe material which can be detached for maintenance or the like by connecting a pipe material used for supplying a chemical liquid such as sulfuric acid or other liquid to a predetermined place. Regarding connection method.

[0002]

2. Description of the Related Art A conventional resin pipe joint has a structure as shown in FIG.

In the figure, 1 is a joint body, 2 is an inner ring,
4 is a cap nut, and 5 is a pipe material. The inner ring 2 is inserted into the pipe member 5, and the inner ring 2 is inserted into the insertion opening 1A of the joint body 1. In this state, the cap nut 4 is screwed into the joint body 1, and the bulging portion 6 of the inner ring 2 is pressed by the pressing edge portion 4A of the cap nut 4 to seal between the inner ring 2 and the joint body 1. The pipe material 5 is prevented from falling off.

As an example of this, for example, actual Kaihei 2-117
There is one described in Japanese Patent No. 494.

[0005]

By the way, in the above-mentioned conventional resin pipe joint, since a chemical such as sulfuric acid may flow into the inside at a high temperature, the sealing property at the joint portion is important. In the above resin pipe joint, there are two sealing portions, that is, a seal surface 7 between the inner ring 2 and the joint body 1 and a seal surface 8 between the inner ring 2 and the pipe material 5. Further, it is the pressing edge portion 4A of the cap nut 4 that presses the respective seal portions against each other. That is, the pushing edge portion 4 </ b> A pushes the inner ring 2 via the pipe material 5 by the screwing of the cap nut 4. As a result, the inner ring 2
The end portions of the seals are pressed in the axial direction of the joint body 1, and the respective seal portions are pressed against each other.

However, at this time, in the inner ring 2, the pressing edge portion 4A of the cap nut 4 exerts a force to reduce the diameter of the tip end portion of the inner ring 2. As a result, the inner ring 2 softened by the high-temperature fluid flowing inside may be bent inward. If it bends inwards like this, the cap nut 4
The pressing force of the pressing edge portion 4A may decrease, and the sealing performance may deteriorate.

Further, since the pressing edge portion 4A of the cap nut 4 is mainly provided with the retaining function of the pipe material 5, if the inner ring 2 bends inward, it is securely supported and retaining. Becomes difficult.

As a result, there is a problem that the reliability of the resin pipe joint is lacking.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a resin pipe joint and a method for connecting pipe materials which are excellent in sealing property and can reliably prevent the pipe material from falling off. And

[0010]

In order to solve the above-mentioned problems, the present invention provides a resin pipe joint according to the first invention, which is a resin pipe joint in which pipe materials are connected to form a continuous flow path, and which has an annular shape or It has a core that is formed in a tubular shape and is press-fitted into the inside of the end portion of the pipe material, and an internal flow passage that forms a continuous flow passage by being connected to the pipe material, and is formed at the end portion of the internal flow passage. And a core body press-fitted into the pipe material is integrally fitted with the pipe material to seal the inside of the flow path with a joint body having a core fitting expanded diameter step portion, and the core body is screwed into the joint body and the core is press-fitted. It consists of a cap nut that connects the pipe material and the joint body, and the core fitting diameter-increasing stepped portion of the joint body,
The core, which is pressed in the axial direction of the joint body by the threading of the cap nut, has a sealing surface that press-contacts and seals the inside of the internal flow path, and the core has a core fitting widening step portion. The core has a tip end surface that is pressed against the seal surface and a base end surface that presses the tip end surface against the seal surface by receiving a pressing force due to screwing of the cap nut, and the base end surface of the core is the axial direction. It is characterized in that it is formed so as to be vertical or inversely tapered.

A resin pipe joint according to a second aspect of the present invention is formed by folding back a tip portion of the core, and the end portion of the pipe material is inserted into the pipe material while the core is press-fitted from the base end portion thereof. The core that is covered over the entire circumference and is press-fitted into the inside of this pipe material is reduced in diameter by being fitted into the core fitting expanded diameter stepped portion to grab the end portion of the pipe material and from the joint body of this pipe material. It is characterized in that it has a folded-back portion to prevent it from falling off.

A resin pipe joint according to a third aspect of the present invention is a pressing surface that presses the base end face of the core by receiving a pressing force due to the screwing of the cap nut while being interposed between the cap nut and the pipe material. And a lip support portion that abuts against the end face of the joint body to seal the joint body.

A resin pipe joint according to a fourth aspect of the present invention covers an inner cylindrical portion inserted into the core from a base end surface of the core, and a conical shape that is folded back from the end portion of the inner cylindrical portion to cover the outer periphery of the core. And a conical surface portion for pressing the core into the inside of the pipe material while the end portion of the pipe material is widened by the conical portion.

According to a fifth aspect of the present invention, there is provided a method for connecting pipe members, the first step of mounting the guide member on the core, and the step of projecting from the conical surface portion of the guide member together with the conical surface portion. The second step of inserting the expanding plug forming the conical surface into the guide member, and the portion of the conical surface formed by the expanding plug and the guide member is pushed into the end of the pipe material, The third step of press-fitting the core into the inside while pushing out, and the core press-fitted into the inside of the pipe material is fitted together with this pipe material into the core fitting expanded diameter step portion, and the cap nut is screwed to the pipe material into the joint body. And a fourth step of connecting.

[0015]

In the first aspect of the invention, the base end face of the core is inclined perpendicularly or inversely to the axial direction so that it is not compressed inward. That is, when the base end face is formed vertically, the pressing force of the cap nut acts only in the axial direction of the core, and the pressing force does not act inward. Further, when the base end face is inclined in the reverse taper shape, the pressing force of the cap nut acts on the outside where the core is pushed open, and the pressing force does not act on the inside. As a result, it is possible to reliably prevent the core from being compressed inward to deteriorate the sealing property and to become the resistance of the flow path.

According to the second aspect of the present invention, the core is fitted to the core fitting diameter-increasing step portion, so that the folded-back portion is compressed and the end portion of the pipe material is gripped. As a result, it is possible to reliably prevent the pipe material from falling out of the joint body.

According to the third invention, the pressing force of the cap nut presses the core via the pressing surface of the seal support member. Further, the lip seal portion of the seal support member comes into contact with the end surface of the joint body to seal. Thereby, the sealing property is further improved.

According to the fourth aspect of the invention, the conical surface portion of the guide member can spread the end portion of the pipe material. This allows the core to be press-fitted inside the pipe material.

According to the fifth invention, the core can be easily press-fitted into the pipe material, and the pipe material can be surely connected to the joint body.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

[First Embodiment] FIG. 1 shows a resin pipe joint 10 according to the present embodiment. FIG. 2 is an aspect diagram showing a connection state of the pipe material 14 to the resin pipe joint 10. This resin fitting 1
0 is mainly composed of a core 11, a joint body 12, and a cap nut 13. The resin pipe joint 10 may connect two pipe materials, or the base end of the joint body 12 may be directly attached to the device to connect the pipe material 14 to the device.

The joint body 12 is formed in a thick tubular shape as a whole, and an internal flow passage 12A is provided therein. The internal flow path 12A forms a continuous flow path with the internal flow path 14A of the pipe material 14 by connecting the joint body 12 and the pipe material 14 to each other. The inner diameter of the internal flow passage 12A is set to be substantially the same as the inner diameter of the pipe material 14.

A core fitting diameter-increasing step 16 is formed at the end of the internal flow passage 12A of the joint body 12. The core fitting diameter-increasing step portion 16 is formed by expanding the diameter of the end portion of the internal flow path 12A. The core 11 press-fitted into the pipe material 14 is integrally fitted into the core fitting expanded diametrical step portion 16 to form a continuous flow path with the pipe material 14 and the inside of the flow path. Seal it. This core fitting wear expanding step 1
6 has a sealing surface 17 and a tapered surface 18. The sealing surface 17 is in the axial direction of the joint body 12 shown in FIG.
It is formed by slightly inclining to the right from the direction orthogonal to the direction of the alternate long and short dash line 19. That is, this sealing surface 1
No. 7 has a gentle conical surface. As a result,
The tip portion of the core 11, which is pressed rightward in the axial direction, is pressed by the sealing surface 17 so that a force acts in a direction of expanding the diameter outward.

The taper surface 18 is a step for expanding the diameter of the core fitting 16
It is formed in a conical shape that expands toward the opening side (left side in FIG. 1) inside, and presses the core 11 into the inside to press down the folded portion 31 described later, and at the same time, the outer periphery of the core 11 described later The surface 11C is the surface to be pressed.

On the outer periphery of the joint body 12, a male screw portion 21 to be screwed with the cap nut 13 is formed. This male thread 2
1, the pressure contact surface of the cap nut 13 described later with the female screw portion 13A is formed in the direction perpendicular to the screwing direction of the cap nut 13 (axial direction of the joint body 12). Here, the pressure contact surfaces of the male screw portion 21 and the female screw portion 13A are the joint body 1
2 is a surface that is strongly pressed when a force acts in the direction in which the cap nut 13 screwed to 2 comes off (leftward in FIG. 1). In FIG. 1, the right side surface of the male threaded portion 21 and the left side surface of the female threaded portion 13A. Say.

A pipe material insertion port 22 is provided at an end portion (left end portion in FIG. 1) of the cap nut 13, and the pipe material 14 is inserted therein. The inner end portion (right end portion) of the tubular material insertion opening 22 is a core pressing surface 2 that presses a base end surface 11B of the core 11 described later.
It is 3. Joint body 1 of inner circumference of cap nut 13
The male screw portion 21 of the joint body 12 is provided at the screwing portion with 2.
A female screw portion 13A that is screwed with is provided.

The core 11 is formed in a substantially annular or tubular shape as a whole, and is press-fitted into the pipe material 14 through an end opening of the pipe material 14. The inner diameter of the core 11 is set to be substantially the same as the inner diameter of the pipe material 14. Tip of core 11 (right end in FIG. 1)
Is a tip surface 11A that is pressed against the sealing surface 17 of the core fitting diameter-increasing step portion 16 and seals the flow paths 12A and 14A. The base end (left end in FIG. 1) of the core 11 is a base end surface 11B that receives a pressing force due to the screwing of the cap nut 13.
Has become. The base end surface 11B receives a pressing force due to the screwing of the cap nut 13 through the pipe material 14, and the front end surface 11A.
Is pressed against the sealing surface 17. The base end surface 11B is formed perpendicular to the axial direction. This is a cap nut 13
This is because the pressing force due to the screwing of the core acts on the inside of the base end portion of the core 11 so that the diameter of this portion is not reduced.
The inner side of the base end portion of the core 11 has a conical shape that expands outward (to the left in FIG. 1), but this is when the core 11 is press-fitted into the pipe material 14. This is because the contracting force of the pipe material 14 causes the inner end portion of the core 11 to have the same inner diameter as the inner diameter of the pipe material 14 when it is compressed. The size of the conical portion is set in consideration of the contracting force of the pipe material 14 and the strength of the core 11.

A folded-back portion 3 is provided on the outer periphery of the tip portion of the core 11.
1 is formed. The folded-back portion 31 is formed by folding back the tip portion of the core 11, and is configured to cover the end portion of the pipe material 14 over the entire circumference in a state where the core 11 is press-fitted into the pipe material 14. The folded portion 31 is
From the state shown in FIG. 2, as shown in FIG. 1, when the core 11 is fitted to the core fitting expanded diameter step portion 16 and is pressed in the diameter reducing direction by the tapered surface 18, the end portion of the pipe material 14 is gripped. The pipe material 14 is prevented from falling off the joint body 12.

An outer peripheral surface (upper side surface in FIG. 1) 11C of the tip portion of the core 11 is formed into a taper surface 18 when the tip surface 11A is pressed against the sealing surface 17 and the tip portion is expanded outward. It is a second seal portion that is pressed and seals. In addition, the first seal portion includes the tip surface 11A and the seal surface 17
It consists of and. In addition, the base end surface 11B with which the pipe member 14 is pressed against the core pressing surface 23 of the cap nut 13 serves as a third seal portion. Further, also in the folded-back portion 31, the folded-back portion 31 is formed by the repulsive force when pressing the end portion of the pipe material 14.
Is pressed against the tapered surface 18, and this portion also serves as a seal portion.

The above-mentioned members are all molded of synthetic resin.

In the resin pipe joint 10 configured as described above, the joint body 12 and the pipe material 14 are connected as follows.

The cap nut 13 is attached to the pipe material 14. Next, the core 11 is press-fitted into the pipe material 14, and as shown in FIG. 2, the core 11 is fitted together with the pipe material 14 into the core fitting enlarged diameter step portion 16. Next, screw the cap nut 13 into the joint body 12,
Further, as shown in FIG. 1, the core pressing surface 23 of the cap nut 13 presses the base end surface 11B of the core 11 as it is further advanced. As a result, the core 11 is press-fitted into the core fitting diameter-increasing step portion 16, and the tip end surface 11A is pressed against the seal surface 17 to seal. This portion becomes the first seal portion. Furthermore, the tip surface 1
When 1A is brought into pressure contact with the seal surface 17, the tip portion of the core 11 is expanded in diameter, and the outer peripheral surface 11C is brought into pressure contact with the tapered surface 18 and seals. This portion becomes the second seal portion.

Further, the base end surface 11B with which the pipe member 14 is pressed against the core pressing surface 23 of the cap nut 13 serves as a third seal portion. Further, also in the folded-back portion 31, the folded-back portion 31 is tapered by the repulsive force when pressing the end portion of the pipe material 14.
It is pressed against 8 and seals at this part as well.

Further, the pipe member 14 is sandwiched between the core pressing surface 23 of the cap nut 13 and the base end face 11B of the core 11, and the pipe member 14 is also prevented from slipping out together with the folded-back portion 31 at this portion.

As described above, since the seal is made at four places and the pipe 14 is held at two places, the inside of the flow path can be surely sealed and the pipe 14 can be surely prevented from falling off from the joint body 12. Like

As a result, the reliability of the resin pipe joint 10 is greatly improved.

[Second Embodiment] The resin pipe joint according to the present embodiment is an improvement of the base end surface 11B of the core 11 of the resin pipe joint 10 according to the first embodiment. The parts other than the parts corresponding to the base end surface 11B and the cap nut 13 of the core 11 are the same as those of the resin pipe joint 10 of the first embodiment, and the same parts are designated by the same reference numerals and the description thereof will be omitted. .

As shown in FIG. 3, in the resin pipe joint 40 of this embodiment, the base end surface 41B of the core 41 is formed so as to be inclined in a reverse taper shape with respect to the axial direction. Specifically, in FIG. 3, it is formed in a conical shape that is inclined slightly to the left from the direction perpendicular to the axial center direction and expands outward (to the left in FIG. 3).

Further, the core pressing surface 43 of the cap nut 42
Are formed so as to be conically inclined along the base end surface 41B.

With the above structure, when the core 41 is pressed by the screwing of the cap nut 42, the core pressing surface 43 of the cap nut 42 is pressed against the base end surface 41B of the core 41. Due to the pressing force of the cap nut 42, a force acts outward at the base end portion of the core 41, which is the direction in which this portion is expanded.

As a result, it is possible to surely prevent the proximal end portion of the core 41 from bending inward to deteriorate the sealing performance of the joint body 12 and obstruct the flow of the fluid in the flow passage.

[Third Embodiment] As shown in FIG. 4, a resin pipe joint 50 according to this embodiment is provided with a seal support member 52 between a core 11 and a cap nut 51. The parts other than the cap nut 51 and the seal support member 52 are the same as those of the resin pipe joint 10 of the first embodiment, and the same parts are designated by the same reference numerals and the description thereof will be omitted.

The overall structure of the cap nut 51 of this embodiment is substantially the same as that of the cap nut 13 of the first embodiment,
In the cap nut 51 of the present embodiment, the tube material insertion port 53 is formed to be greatly enlarged, and the inside thereof is formed into a conical shape whose diameter is expanded rightward in the drawing.

The seal support member 52 is formed in a substantially cylindrical shape as a whole, and its inner diameter is the same as the outer diameter of the pipe material 14. The seal support member 52 is a cap nut 51.
Is inserted into the pipe material insertion port 53, and the outer periphery thereof is formed in a conical shape that expands in diameter toward the tip (the right end in the drawing) in conformity with the pipe material insertion port 53. The tip surface portion of the seal support member 52 is a pressing surface 5 that presses the base end surface 11B of the core 11.
4 and the seal support member 52 is the cap nut 5
The base end surface 11B of the core 11 is pressed by the pressing force due to the screwing of the cap nut 51 in the state of being attached to the first tube material insertion port 53.

A lip seal portion 55 is formed on the outer periphery of the tip portion of the seal support member 52 so as to expand in a dish shape. In the lip seal portion 55, a lip portion 56 is formed in a protruding ring shape from the outer peripheral edge portion expanded in a dish shape toward the joint body 12 side, and the lip portion 56 abuts against the end surface 12B of the joint body 12 to seal.

A locking flange 57 is provided at the base end portion of the seal support member 52 so that the seal support member 52 does not fall out of the pipe material insertion port 53.
Because of this locking flange 57, the seal support member 5
When it is difficult to insert 2 into the pipe material insertion port 53, a slit is provided.

With the above structure, the pressing force due to the screwing of the cap nut 51 directly acts on the seal support member 52. In the seal support member 52 that receives this pressing force,
The pressing surface 54 is the base end surface 11B of the core 11 via the pipe material 14.
Is pressed to connect the pipe material 14 to the joint body 12 and seal the flow path.

Further, in the seal support member 52 which receives the pressing force of the cap nut 51, the pressing surface 54 presses the core 11 and the lip portion 56 of the lip seal portion 55.
Comes into contact with the end surface 12B of the joint body 12 to seal this portion.

This makes it possible to more reliably seal the inside of the flow path in cooperation with the first, second and third seal portions between the core 11 and the joint body 12.

In this case, the base end surface 11B of the core 11 may be formed in a reverse taper shape.

[Fourth Embodiment] Next, a method of connecting pipe materials according to a fourth embodiment will be described with reference to FIGS.

In each of the above-described embodiments, the cores 11 and 41 having a diameter larger than that of the pipe material 14 are used.
It is difficult to press fit the cores 11 and 41 into the pipe material 14.
Therefore, a method of press-fitting the cores 11 and 41 into the pipe material 14 has been devised.

In this press-fitting operation, as shown in FIG. 5, a diameter expansion plug 61 and a guide member 62 are used. Here, the core 63 has the configuration shown in FIG. The core 63 includes a front end surface 11A, a base end surface 11B, an outer peripheral surface 11C and a folded back portion 31 of the core 11 of the first embodiment, which has the same structure as the front end surface 63A, the base end surface 63B, the outer peripheral surface 63C and the folded back portion 64. The core 63 has a locking groove 65 for locking a locking claw portion 70 of the guide member 62, which will be described later, at substantially the center thereof. Furthermore, the core 63
A reduced diameter stepped portion 66 is formed in consideration of the thickness of the guide member 62 covering from the base end side.

As shown in FIG. 7, the guide member 62 includes an inner cylindrical portion 68 inserted into the core 63, an outer cylindrical portion 69 fitted to cover the reduced diameter step portion 66, and an outer cylindrical portion 69. The locking groove 6 is provided in a reduced diameter at one end (right end in FIG. 7) of the tubular portion 69.
5, the locking claw portion 70 that is locked to the inner cylinder portion 68 at the other end.
And a guide surface portion 71 which is connected to the outer cylinder portion 69 and is formed as a conical inclined surface. This guide surface 7
The inclination angle of 1 is set to be the same as or close to the diameter-expanding conical surface 75 of the diameter-expanding plug 61 described later.
This inclination angle is such that the end portion of the pipe material 14 spread by the diameter-expanding conical surface 75 is applied to the guide surface portion 71 and can be continuously and smoothly spread as it is to cover the core 63, that is, the core. The angle is such that 63 can be press-fitted into the pipe material 14.

As shown in FIG. 5, the expanded diameter plug 61 has a core tip receiving portion 73 for receiving and supporting the tip portion (the right end portion in FIG. 5) of the core 63, and a base inserted into the core 63. It is composed of a diameter-expanding rod portion 74 protruding outward from the end portion. The core front end receiving portion 73 is formed in conformity with the front end shape of the core 63 so that the core 63 can be reliably supported. The diameter expanding rod portion 74 has a core tip receiving portion 73.
The core 63 is inserted into the core 63 in a state of being supported by the core 63 and protrudes outward from the base end of the core 63. The diameter-expanding conical surface 75 is
It is formed into a truncated cone shape with the leading end removed, and its tip is set smaller than the inner diameter of the pipe material 14. As a result, when the tip end of the diameter expanding rod portion 74 is inserted into the pipe material 14, the end portion of the pipe material 14 is guided by the diameter expanding conical surface 75.
It can be pushed and spread until it reaches the second guide surface portion 71.

The above-mentioned parts are molded of synthetic resin. The diameter expansion plug 61 can be made of synthetic resin or metal.

Next, a method of connecting pipe materials using the above-described expanded diameter plug 61 and guide member 62 will be described.

(First Step) First, the guide member 62 is attached to the core 6
Attach to 3. That is, the inner cylinder portion 68 of the guide member 62 is inserted into the core 63, the outer cylinder portion 69 covers the reduced diameter step portion 66, and the locking claw portion 70 is fitted into the locking groove 65.
As a result, the guide member 62 is mounted so as not to fall off the core 63.

(Second Step) Next, the expanded diameter plug 61 is inserted into the inner cylindrical portion 68 of the guide member 62 and fitted until the tip portion of the core 63 is fitted. As a result, the expanded plug 61
Of the core 63 protrudes from the base end side of the core 63.
A continuous conical surface is formed with the guide surface portion 71, and the end portion of the pipe material 14 is expanded by this conical surface.

(Third step) The expanded plug 61 is attached to the guide member 6
In the state of being inserted in 2, the tip end portion forming the continuous conical surface is pushed into the end portion of the pipe material 14. As a result, the pipe material 14
First, the end portion of is gradually expanded by the diameter-enlarging conical surface 75 of the diameter-enlarging plug 61. Then, it is applied to the guide surface portion 71 of the guide member 62, is guided by the guide surface portion 71 and is further spread, and finally the core 63 is completely pressed into the inside of the pipe member 14. The core 63 is press-fitted until the end of the pipe material 14 comes into contact with the inside of the folded portion 31.

The cap nut 13 is attached to the pipe member 14 in advance.

(Fourth step) As shown in FIG.
The core 63 press-fitted into the core fitting 13 is fitted together with the pipe material 14 into the core fitting expanded diameter step portion 16, and the cap nut 13 is screwed.
By the screwing of the cap nut 13, the core pressing surface 23 of the cap nut 13 is guided through the pipe material 14 to the guide surface portion 7 of the guide member 62.
Press 1. As a result, the core 63 is pushed on the inner side of the core fitting diameter-increasing step portion 16 and the guide surface portion 71 itself of the guide member 62 is pushed and bent to come into contact with the base end surface 63B of the core 63. As a result, the end portion of the inner tubular portion 68 protrudes outside the tip end surface 63A of the core 63, but the end portion of the inner tubular portion 68 hits the seal surface 17 and extends outward in the radial direction as shown in FIG. Spread to.

At the same time, the core 63 is further pressed and pressed into the inner side of the core fitting diameter-increasing step portion 16. As a result, the inside of the flow path is sealed by the first, second, and third seal portions, and the folded portion 31 holds the tip of the pipe material 14.
Further, the folded portion 31 and the tapered surface 18 are pressed against each other, and this portion also serves as a seal portion.

As a result, the joint body 12 and the pipe member 14 are securely connected.

The guide member 62 is composed of the pipe member 14 and the core 63.
, And functions as a packing between the core 63 and the joint body 12.

In the fourth step, the guide member 6
The guide surface portion 71 of the second portion is pressed and bent, and
3B, but depending on the size difference, the guide surface 7
1 may protrude inside the core 63. In this case, as shown in FIG. 11, the guide surface portion 81 has the same size as the base end surface 63B of the core 63.

[0067]

As described in detail above, according to the method of connecting the resin pipe joint and the pipe material of the present invention, the following effects can be obtained.

(1) With the resin pipe joint of the first invention,
Since the base end face of the core is inclined perpendicularly or inversely to the axial direction, it is not compressed inward. As a result, it is possible to reliably prevent the core from being compressed inward to deteriorate the sealing property and to become the resistance of the flow path.

(2) With the resin pipe joint of the second invention,
When the core is fitted to the core fitting diameter-increasing step, the folded-back portion is compressed and the end portion of the pipe material is gripped. As a result, it is possible to reliably prevent the pipe material from falling out of the joint body.

(3) With the resin pipe joint of the third invention,
The pressing force of the cap nut presses the core via the pressing surface of the seal support member, and the lip seal portion of the seal support member abuts against the end surface of the joint body to seal, thereby further improving the sealability. .

(4) With the resin pipe joint of the fourth invention,
Since the conical surface portion of the guide member spreads the end portion of the pipe material, the core can be easily press-fitted inside the pipe material.

(5) From the above, the reliability of the resin pipe joint is improved.

(6) By the pipe material connecting method of the fifth invention, the core can be easily press-fitted into the pipe material, and the pipe material can be surely connected to the joint body. This makes connection work extremely easy.

[Brief description of drawings]

FIG. 1 is a sectional view of essential parts showing a resin pipe joint according to a first embodiment.

FIG. 2 is a sectional view of an essential part showing the resin pipe joint of FIG. 1 in an exploded state.

FIG. 3 is a cross-sectional view of essential parts showing a resin pipe joint according to a second embodiment.

FIG. 4 is a cross-sectional view of essential parts showing a resin pipe joint according to a third embodiment.

FIG. 5 is a cross-sectional view showing a guide member and a core front end receiving portion used in a pipe material connecting method according to a fourth embodiment.

FIG. 6 is a partial cross-sectional view showing a core used in a method of connecting pipe materials.

FIG. 7 is a partial cross-sectional view showing a guide member used in a method of connecting pipe materials.

FIG. 8 is a partial cross-sectional view showing a state in which a guide member is fitted to the core.

FIG. 9 is a partial cross-sectional view showing a state in which the core is inserted into the core-fitting expanded diameter step portion when connecting the pipe material to the joint body.

FIG. 10 is a partial cross-sectional view showing a state in which a pipe material is connected to a joint body.

FIG. 11 is a cross-sectional view showing a modified example.

FIG. 12 is a partial cross-sectional view showing a conventional resin pipe joint.

[Explanation of symbols]

10 ... Resin pipe joint, 11 ... Core, 11A ... Tip surface, 11
B ... Base end surface, 11C ... Outer peripheral surface, 12 ... Joint body, 12A
... internal flow path, 13 ... cap nut, 14 ... pipe material, 16 ... core fitting expanded diameter step, 17 ... sealing surface, 18 ... taper surface, 2
3 ... Core pressing surface, 31 ... Folded portion.

Claims (5)

[Claims] 1. A resin pipe joint for connecting pipes to form a continuous flow path, the core being formed in an annular or tubular shape and being press-fitted into the pipe from an end of the pipe, and the core being connected to the pipe. A core that has an internal flow path that forms a continuous flow path and that has a core formed at the end of the internal flow path and press-fitted into the pipe material is integrally fitted with the pipe material to seal the inside of the flow path. A fitting main body having a fitting-expansion step, and a cap nut that connects the pipe body into which the core is press-fitted and screwed into the fitting body and the fitting body, wherein the core fitting-expansion step of the fitting body is A core having a sealing surface that presses the core pressed in the axial direction of the joint body by the screwing of the cap nut to seal the inside of the internal flow path, and the core has the core fitting expanded diameter step portion. End face that is pressed against the sealing surface of the A base end face that presses the tip end face against the seal face in response to a pressing force due to screwing, and the base end face of the core is formed to be inclined in a vertical or reverse tapered shape with respect to the axial direction. Resin fittings characterized by 2. A resin pipe joint for connecting pipes to form a continuous flow path, the core being formed into an annular or tubular shape and being press-fitted into the inside from an end of the pipe, and the core being connected to the pipe. A core that has an internal flow path that forms a continuous flow path and that has a core formed at the end of the internal flow path and press-fitted into the pipe material is integrally fitted with the pipe material to seal the inside of the flow path. A core body having a fitting main body having a diameter-increasing step portion, a pipe nut screwed into the joint body and press-fitting the core, and a cap nut for connecting the joint body. The core is formed by folding back the tip of the core. Covers the end portion of the pipe material over the entire circumference in a state of being press-fitted from the base end portion into the pipe material, and the core press-fitted inside the pipe material is fitted to the core fitting expanded diameter step portion. The diameter of the pipe is reduced by wearing Grasp the resin pipe joint, characterized by having a folded portion to prevent the disconnect drop from the joint body of the tubing. 3. A resin pipe joint for connecting pipes to form a continuous flow path, the core being formed in an annular or tubular shape and being press-fitted into the pipe from an end of the pipe, and the core being connected to the pipe. A core that has an internal flow path that forms a continuous flow path and that has a core formed at the end of the internal flow path and press-fitted into the pipe material is integrally fitted with the pipe material to seal the inside of the flow path. A joint body having a fitting-expansion step, and a cap nut that connects the pipe body and the fitting body that are screwed into the fitting body and press-fits the core, and a core fitting-expansion step section of the fitting body, The core, which is pressed in the axial direction of the joint body by the threading of the cap nut, has a sealing surface that is in pressure contact with and seals the inside of the internal flow path, and the core is the core fitting widening step portion. The tip surface pressed against the sealing surface, And a base end surface that presses the tip end surface against the sealing surface in response to a pressing force due to the screwing of the nut, and is pressed between the cap nut and the pipe material by the screwing of the cap nut. A resin pipe joint, comprising: a seal support member having a pressing surface that receives and presses the base end surface of the core, and a lip seal portion that abuts and seals the end surface of the joint body. 4. A resin pipe joint for connecting pipes to form a continuous flow path, the core being formed in an annular or tubular shape and press-fitted into the core from an end of the pipe, and the core is connected to the pipe. A core that has an internal flow path that forms a continuous flow path and that has a core formed at the end of the internal flow path and press-fitted into the pipe material is integrally fitted with the pipe material to seal the inside of the flow path. A joint body having a fitting-expansion step, and a cap nut that connects the pipe body and the fitting body that are screwed into the fitting body and press-fits the core, and a core fitting-expansion step section of the fitting body, The core, which is pressed in the axial direction of the joint body by the threading of the cap nut, has a sealing surface that is in pressure contact with and seals the inside of the internal flow path, and the core is the core fitting widening step portion. The tip surface pressed against the sealing surface, An inner cylinder portion that is inserted into the core from the base end surface of the core, and has a base end surface that presses the tip end surface against the seal surface in response to a pressing force due to the screwing of the nut. It is provided with a guide member including a conical surface portion that is folded back from an end portion in a conical shape and covers the outer circumference of the core, and presses the core into the tubular material while the end portion of the tubular material is spread by the conical portion. And resin fittings. 5. A first member for mounting the guide member on the core.
A second step of inserting into the guide member a diameter-expanding plug that forms a continuous conical surface in cooperation with the conical surface portion in a state of protruding from the conical surface portion of the guide member; The third step of pushing the portion of the conical surface constituted by the guide member into the end of the pipe material, pressing the core inside while expanding the end portion of the pipe material, and the core press-fitted inside the pipe material At the same time, a pipe connecting method comprising a fourth step of connecting the pipe member to the joint body by fitting the core fitting expanded diameter step portion and screwing a cap nut.