JP2001041364A - Inner ring press-in jig for pipe joint made of resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily press tubing in, and fix it thereto without impairing the inner circumferential surface of the tubing and the tip end of an inner ring even if they are more or less changed in diameter because of errors in manufacture and the like when press-in and connection are effectively performed without pre-heating the tubing. SOLUTION: A diameter widening member 31 in a cone shape, the outer diameter at the tip end of which is smaller than the inner diameter of resinous tubing at its tip end, but the outer diameter at the rear end of which is greater than the outer diameter at the tip end of an inner ring 8, is detachably fixed so as to be held by the tip end of a holder 30 inserting and holding the inner ring 8. As the diameter widening member 31 is pressed in so as to be moved to the end part of the tubing, let the end part of the tubing be plastically deformed in the diameter widening direction, after that, the inner ring 8 is pressed into the end part of the bubing by means of pressing the holder 30 in.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for press-fitting an inner ring of a resin pipe joint, and more particularly, to a jig used in manufacturing processes in various technical fields such as semiconductor manufacturing, medical care, pharmaceutical manufacturing, food processing, and chemical industry. In one end of the resin pipe, which is one connecting member of the resin pipe joint applied to the high purity liquid or ultrapure water piping, the sealing force and the retaining force between the pipe and the joint body are increased. The present invention relates to an inner ring press-fitting jig for a resin pipe joint used when press-fitting and fixing a sleeve-shaped inner ring for making the inner ring press.

[0002]

2. Description of the Related Art As an example of a resin-made pipe joint of this type, one having a configuration as shown in FIG. 11 is known. This figure 1
1 are made of, for example, PFA, PTFE, E
It comprises a tubular joint body 1 made of a resin having excellent properties of chemical resistance and heat resistance such as TFE, a sleeve-shaped inner ring 8, and a cap nut-shaped pressing ring 9.

The joint body 1 has a cylindrical receiving port 2 formed at one end in the axial direction, and forms a tertiary seal portion 5C, which will be described later, intersects the axis C at the entrance of the receiving port 2. An inclined seal surface 4 is formed, and an annular seal end surface 6 that forms a primary seal portion 5A, which will be described later, is formed in a deep portion of the receiving port 2. A cylindrical groove portion 7 forming the next seal portion 5B is formed, and a male screw portion 3 is formed on the outer periphery thereof.

The inner circumference of the sleeve-shaped inner ring 8 is formed to have the same inner diameter as the inner circumference of the resin tube 10 and the inner circumference of the body 1A of the joint body 1, so that the movement (flow) of the fluid is not hindered. It is formed and has a fitting portion 11 at its inner end which can be fitted to the socket 2 of the joint body 1, and a distal end portion of a tube material press-fitting portion 12 formed continuously with the fitting portion 11. A bulged portion 13 having a mountain-shaped cross section is formed on the outside of the side,
By press-fitting the press-fitting portion 12 into one end of the pipe material 10 and fixing the fitting portion 11 in a state where the fitting portion 11 protrudes from one end portion of the pipe material 10,
The outer peripheral sealing surface 14 is formed so that the peripheral wall portion of the joint body 1 is enlarged in diameter and abuts the inclined sealing surface 4 formed at the entrance of the receiving port 2 of the joint body 1 from the axial direction to form the tertiary seal 5C. An insertion portion 15 for the tube material 10 to be inserted into the socket 2 of the joint body 1 is formed.

When the insertion portion 15 of the tube 10 is inserted into the socket 2 of the joint body 1, the annular seal is inserted into the fitting portion 11, which is a protrusion of the inner ring 8 from the tube 10. A protruding inner end face 16 is formed in contact with the end face 6 from the axial direction to form the primary seal portion 5A, and the protruding inner end face 16 and the annular seal end face 6 are sequentially reduced in diameter toward their inner peripheral sides. At the radially outer position of the protruding inner end surface 16 formed by this tapered surface, the protruding inner end surface 16 protrudes outward in the axial direction from the protruding inner end surface 16 and is pressed into the cylindrical groove portion 10. The cylindrical seal portion 17 forming the secondary seal portion 5B is integrally formed so as to protrude.

[0006] The cap nut-shaped pressing ring 9 has a female threaded portion 18 which is screwed into the male threaded portion 3 of the joint body 1 on the inner peripheral surface of the cylindrical portion 9A, and the cylindrical portion 9A.
An annular pressing portion 9B extending toward the axial center side and pressing the tube material 10 from the outside thereof is integrally connected to the outer end of the annular pressing portion 9B. A pressing edge 9C is formed at the inner end position of the annular pressing portion 9B. Have been.

In the resin pipe joint having the components 1, 8, 9 as described above, the press-fit portion 1 of the inner ring 8 is used.
2 is press-fitted into one end of the tube material 10 and fixed, and the peripheral wall portion of the tube material 10 corresponding to the bulging portion 13 formed in the press-fit portion 12 is enlarged in diameter, so that the tube members 8 and 10 are integrally joined to each other. The insertion part 15 of 10 is formed. Then, the insertion portion 15 of the tube material 10 is inserted into the socket 2 of the joint body 1 and the cylindrical seal portion 17 of the inner ring 8 is fitted to the joint body 1.
To the inside of the cylindrical groove 7 on the side.

Next, the female thread 18 of the push ring 9 loosely fitted to the outside of the tube 10 is screwed into the male thread 3 of the joint body 1 and the push ring 9 is screwed toward the joint body 1. The inner ring 8 is pressed from the axial direction by the pressing edge 9C of the annular pressing portion 9B.
The cylindrical seal portion 17 is press-fitted into the cylindrical groove portion 7 of the joint main body 1 to generate a radial surface pressure between the inner and outer peripheral surfaces of the two 17, 17 to form the axially long secondary seal portion 5B. Let it. Further, the axial length of the secondary seal portion 5B is increased by screwing and strongly tightening the pressing wheel 9, and the protruding inner end surface 1 on the inner ring 8 side is further increased.
6 is brought into contact with the annular seal end face 6 of the socket 2 on the joint body 1 side to generate an axial surface pressure between the two 16 and 6 to form a primary seal portion 5A. An outer peripheral sealing surface 14 of the insertion portion 15 of the pipe member 10 is made to abut against the inclined sealing surface 4 formed at the inlet of the receiving port 2 from the axial direction to form a tertiary seal portion 5C, thereby connecting the pipe member 10 to a joint. It is connected to the main body 1 in a retaining state and in a sealed state.

A jig for press-fitting and fixing the sleeve-shaped inner ring 8 into one end of the resin-made pipe member 10 at normal temperature in the resin-made pipe joint having the above structure is disclosed in, for example, Japanese Utility Model Laid-Open Publication No. Sho 62-134629. An inner ring insertion device as disclosed is known. As shown in FIG. 12, this conventional inner ring insertion device has a clamp portion 21 for fixing and holding the tube material 10 at one end of a base arm 20 and a clip portion 22 and a grip 22 at the other end of the base arm 20. A toggle lever 23 pivotally attached to the portion 22 is provided. One end of the toggle lever 23 is engaged with the end of the toggle lever 23, and the spring 28 is slidable on a guide base 24 attached to the base arm 20. A feed member 27 having a feed arrow 26 capable of fitting and holding the inner ring 8 is screwed and fixed to the other end of the slide shaft 25 held by being moved and urged in a direction away from the clamp portion 21 via It is configured.

According to the inner ring insertion device having such a structure, the tube member 10 is clamped by the clamp portion 21, while the inner ring 8 is fitted and held in the feed arrow 26 of the feed member 27, and the grip portion 22 is moved. By strongly pulling the grip toggle lever 23 against the elastic biasing force of the spring 28, the feed arrow 26 and the inner ring 8 are moved from one end of the tube 10 as shown in FIG.
Is inserted into the tube 10 and fixed. Then, after the insertion and fixing is completed, the toggle lever 23 is returned via the biasing force of the spring 28, so that the inner ring 8 is left in the tube 10 and the foot arrow 26 is pulled out from one end of the tube 10, so that the tube 10 The inner ring 8 is inserted and fixed in one end of the inner ring 8, and the peripheral wall portion of the tube material 10 corresponding to the bulging portion 13 formed in the press-fitting portion 12 of the inner ring 8 is expanded in diameter, so that the two 8, 10 are integrally joined. An insertion portion 15 for the tube 10 is formed.

[0011]

However, in the conventional inner ring insertion device having the above structure,
Even if there is a slight dimensional error such that the inner diameter of the pipe member 10 is slightly larger than the outer diameter of the feed arrow 26 of the feed member 27, the feed ring 26 and the inner ring 8 fitted and held therein are removed from the pipe member. There is a problem that the tip of the inner ring 8 or the inner peripheral surface of the tube 10 can be damaged by being unable to press-fit into the tube 10 or by forcibly inserting the tube 10 into the tube 10. On the other hand, if the outer diameter of the feed arrow 26 is made smaller than the inner diameter of the tube 10, the inner diameter of the inner ring 8 fitted and held is naturally smaller than the inner diameter of the tube 10. In the pipe material 10
A step occurs between the inner peripheral surface of the inner ring 8 and the inner peripheral surface of the inner ring 8, and this step tends to cause a liquid pool that is not preferable as a pipe joint when transporting a high-purity liquid or ultrapure water. Was.

When the inner ring insertion device is used, the end of the resin tube 10 is softened in advance by heating, and then the inner ring 8 is inserted into the end of the tube 10 via the feed arrow 26. It is possible to do
In this case, it is necessary to prepare a heating device such as a heater for heating, and after the press-fitting, it is necessary to wait until the pipe material 10 is cooled before making a connection. Another problem is that it takes time.

[0013] The present invention has been made in view of the above-described circumstances, and is capable of performing very efficient press-fitting and connection work without the need for preheating, etc., and also has an inner ring attached to the end of the pipe. Inner ring press-fitting of resin pipe joints that can be easily press-fitted and fixed to an appropriate expanded state without damaging the tip of the inner ring and the pipe material even if there is a slight change in diameter due to manufacturing errors etc. The purpose is to provide jigs.

[0014]

To achieve the above object, an inner ring press-fitting jig for a resin pipe joint according to the present invention comprises a sleeve-like inner ring (8) inside an end of a resin pipe material (10). For press-fitting and fixing the inner ring (8) by a relative movement in the axial direction with respect to the resin pipe (10), the tip of a holder (30) for inserting and holding the inner ring (8). Has its tip (3
The outer diameter (D1) of 1a) is smaller than the inner diameter (d1) of the resin pipe (10), and the rear end (31)
The outer diameter dimension (D2) of b) is larger than the outer diameter dimension (d2) of the tip of the inner ring (8), and the resin pipe material (10)
The expanding member (31) for plastically deforming the end portion (10a) of the resin pipe material (10a) in the expanding direction in accordance with the pushing movement to the end portion (10a) is detachably fixed and held. It is characterized by the following.

According to the present invention, the inner ring is inserted and held in the holder, and the enlarged diameter member is fixedly held at the tip of the holder. The jig is advanced so that the holder is pressed toward the end of the resin tube material to which the fixed member is fixed, so that the enlarged-diameter member enters the resin tube material from the tip end, and the end of the tube material is removed. It is plastically deformed in the expanding direction. Then, the jig is retracted, the enlarged member is extracted from the resin pipe, and after removing the enlarged member from the tip of the holder, the jig is moved forward again to make the holder and the inner ring the enlarged resin member. By pressing and moving a predetermined amount from the end of the tube material into the tube material and extracting only the holder, the work of press-fitting and fixing the inner ring into the end portion of the tube material is completed.

In the inner ring press-fitting jig for a resin pipe joint having the above-mentioned structure, the end of the diameter-expanding member increases in diameter as the resin tube is pushed into the end. When plastically deformed in the direction, the inner diameter of the resin tube is the same as or larger than the inner diameter of the inner ring. When removing and pushing the inner ring to the end of the tube, the end of the inner ring abuts against the inner peripheral surface of the tube, which may cause damage to the inner ring end and the inner peripheral surface of the tube. The inner ring can be easily and smoothly pressed into and fixed to the end of the tube material without generating.

In the inner ring press-fitting jig for a resin pipe joint having the above-mentioned structure, a stopper for limiting the amount of pushing into the resin pipe material may be provided at a rear end of the expanding member. The amount of plastic deformation in the tube axis direction and the diameter-enlarging direction at the end of the resin pipe material can be set to an appropriate value without variation.

In the inner fitting press-fitting jig for a resin pipe joint having the above-described structure, the entirety of the holder and the enlarged diameter member may be formed in consideration of a manufacturing surface and a handling surface. It is preferable to be made of a resin material. When a resin material is used, it is usually desirable to use inexpensive polypropylene (PP) or the like.
In addition to the above, a combination of fluorine resin materials such as polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), and PFA may be used. Of these constituent members, particularly, the diameter-enlarged member can be made of a fluorine resin as described in claim 5, so that the coefficient of friction between the diameter-enlarged member and the pipe can be reduced. Further, the pushing movement for expanding the diameter of the end portion of the tube can be performed more smoothly.

Furthermore, in order to ensure the strength of the jig when a small-diameter pipe joint is used, the holder is made of a metal material and the outer peripheral surface thereof is coated with a resin. Thereby, while ensuring necessary strength, adhesion of metal ions can be prevented, and the inconvenience of mixing impurities during transportation of a high-purity liquid or ultrapure water used in a semiconductor manufacturing process can be solved.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a semi-longitudinal side view of an inner ring press-fitting jig for a resin pipe joint according to the present invention. This inner ring press-fitting jig A has an axially straight large-diameter portion 30a for inserting and holding an inner ring 8. A small-diameter portion 30b integrally formed to project forward from the front end side of the feed member 27 in the inner ring insertion device described in FIG. And a mounting shaft portion 30c which can be fixed by a set bolt 33 and which is entirely formed integrally from a resin material such as PP, and removably fitted to a small-diameter portion 30b of the holder 30. It is composed of a fixed diameter member 31 made of resin such as PP fixed.

The outer diameter member (D1) of the distal end portion 31a in the axial direction of the diameter-enlarging member 31 is smaller than the inner diameter size (d1) of the resin tube material 10, and the rear end portion in the axial direction thereof. The outer diameter dimension (D2) of the inner ring 31 is formed in a conical shape larger than the outer diameter dimension (d2) of the front end portion 8a of the inner ring 8, and the rear end portion 31b is pushed into the resin tube material 10 at the rear end portion 31b. Is integrally provided. This enlarged diameter member 31 is used to
Is pushed into the end 10a, and the resin tube material 1
The plastic deformation of the end 10a of the inner ring 8 is such that when such plastic deformation is performed, the inner diameter (d3) of the straight portion connected to the expanded end 10a of the resin tube 10 is increased. The inner diameter (d4) is formed to be equal to or slightly larger than the inner diameter (d4).

Next, the inner ring 8 is press-fitted into one end 10a of the pipe member 10 using the resin pipe joint inner ring press-fitting jig A having the above-described configuration and fixed. An operation of forming the insertion portion 15 of the joint will be described. (1) The holder 3 is inserted into the holding hole 27a formed at the tip of the feed member 27 in the inner ring insertion device shown in FIG.
After the 0 mounting shaft 30d is inserted and fixed with the set bolt 33, the inner ring 8 is inserted and held in the large diameter portion 30a of the holder 30, as shown in FIG. (2) In this state, as shown in FIG.
The large-diameter member 31 is fitted and fixed to the small-diameter portion 30b. (3) Next, as shown in FIG. 4, the tube 10 is clamped by the clamp 21 in the inner ring insertion device 12. (4) Subsequently, the grip portion 22 of the inner ring insertion device
By pressing the toggle lever 23 strongly against the elastic biasing force of the spring 28, the press-fitting jig A is moved forward toward the end 10a of the tube 10 as shown in FIG. The large diameter member 31 is pushed into the one end portion 10a of the tube material 10 from its small diameter side end portion 31a, whereby the one end portion 10a of the tube material 10 is plastically deformed in the radially enlarged direction. At this time, the inner diameter (d) of the straight portion connected to the enlarged one end 10a of the resin pipe material 10 is set.
3) is the same as or slightly larger than the inner diameter (d4) of the inner ring 8. (5) Thereafter, the grip portion 22 of the inner ring insertion device
Is released to return the toggle lever 23 via the urging force of the spring 28, the jig A moves backward, and the diameter-enlarging member 31 moves, as shown in FIG.
Get out of In this extracted state, the holder 30
The large diameter member 31 fitted and fixed to the small diameter portion 30b is removed from the holder 30 as shown in FIG. (6) Then, the gripping portion 22 of the inner ring insertion device is again gripped, and the toggle lever 23 is strongly pulled against the elastic biasing force of the spring 28, as shown in FIG. The inner ring 8 inserted and held in the holder 30 is moved forward toward the one end 10a of the tube 10 so that the inner ring 8 is moved forward.
After inserting the holder 30 into the tube 10a, the holder 30 is pulled out to complete the press-fitting and fixing operation of the inner ring 8 into the one end 10a of the tube material 10 as shown in FIG.

As described above, the end 10 of the resin pipe 10
By simply moving the jig A twice in the axial direction with respect to the tube 10 without requiring preheating or the like to the inner ring 8, the end 10 a of the tube 10 is always appropriately and uniformly expanded in diameter to form the inner ring 8. Can be easily and smoothly press-fitted into the end portion 10a of the tube material 10, and the inner diameter (d4) of the inner ring 8 can be the same as or slightly larger than the inner diameter (d3) of the tube material 10. Even if there is a manufacturing error or the like, it is possible to reliably avoid a situation that is unfavorable for the pipe joint, such as damaging the tip of the inner ring 8 or the inner peripheral surface of the pipe 10.

In the above embodiment, the entire holder 30 and the enlarged diameter member 31 are made of a resin material such as PP for a large diameter pipe joint having a large diameter of the pipe member 10 and the joint body. However, by forming the expanding member 31 from a fluorine resin material such as PET, PTFE, or PFA, the coefficient of friction between the expanding member 31 and the tube 10 is reduced, and the end 10a of the tube 10 is expanded. When the diameter is increased, the push-in movement of the enlarged diameter member 31 with respect to the tube material 10 can be performed more smoothly.

In the case of a small-diameter pipe joint where both the pipe member 10 and the joint body are small, as shown in FIG.
Is formed of a metal material such as SUS304, and by applying a fluorine resin coating layer 34 on the outer peripheral surface of the metallic material holder 30, for example, the metal ions can be transferred to the outer peripheral surface while sufficiently securing the strength of the holder 30. Adhesion can be prevented, and the inconvenience of mixing impurities during transportation of high-purity liquid or ultrapure water used in the semiconductor manufacturing process can be solved.

[0026]

As described above, according to the present invention, the end of the resin pipe is expanded and plastically deformed while the end is kept cold, without requiring any equipment and labor such as preheating the pipe. Since the inner ring only needs to be press-fitted into the end of the expanded tube, the operation from the diameter expansion of the end of the tube and press-fitting of the inner ring to the connection as a pipe joint can be made very efficient. Moreover, even if the inner diameter of the inner ring is the same as or slightly larger than the inner diameter of the tube,
The inner ring can be easily and smoothly pressed into the end of the tube material without damaging them, and in addition, the degree of diameter expansion of the tube material is always uniform and appropriate, so that excessive diameter expansion and unevenness can be achieved. Enlargement of the diameter can be prevented. Therefore, there is an effect that the inner ring can be easily press-fitted and fixed to one end of the pipe material with a simple operation.

In particular, by forming the entire holder and the diameter-enlarged member from a resin material, excellent effects can be obtained in corrosion resistance and chemical resistance during transportation of a high-purity liquid or ultrapure water used in a semiconductor manufacturing process. Can be.

Further, by forming the diameter-expanding member of the holder and the diameter-expanding member from a fluororesin material, it is possible to reduce the friction coefficient between the diameter-expanding member and the resin tube at the time of expanding the end of the tube material. As a result, the push-in movement of the diameter-enlarging member into the pipe material can be performed more smoothly.

Further, when a small-diameter pipe joint is used, the holder is made of a metal material, and the outer peripheral surface of the holder is coated with a resin such as a fluorine resin. While ensuring the strength, the adhesion of metal ions is prevented, and the inconvenience of mixing impurities during transportation of a high-purity liquid or ultrapure water used in a semiconductor manufacturing process can be solved.

[Brief description of the drawings]

FIG. 1 is a semi-longitudinal side view showing an inner ring press fitting jig of a resin pipe joint according to the present invention.

FIG. 2 is a semi-longitudinal side view showing a set state of a holder before a press fitting operation of the resin pipe joint by an inner ring press fitting jig.

FIG. 3 is a semi-longitudinal sectional side view showing a state in which a large diameter member is attached to a holder before a press fitting operation of the resin pipe joint by an inner ring press fitting jig.

FIG. 4 is a semi-longitudinal sectional side view showing a first state of the resin pipe joint at the time of expanding the diameter of the end of the pipe material by an inner ring press-fitting jig.

FIG. 5 is a semi-longitudinal side view showing a second state of the resin pipe joint in the second state at the time of expanding the diameter of the end of the pipe material by the inner ring press-fitting jig.

FIG. 6 is a semi-longitudinal sectional side view showing a state at the time of completion of the work of expanding the end of the pipe material by the inner ring press-fitting jig of the resin pipe joint.

FIG. 7 is a semi-longitudinal side view showing a state before the inner ring press fitting operation of the resin pipe joint by the inner ring press fitting jig.

FIG. 8 is a semi-longitudinal side view showing a state at the time of inner ring press-fitting operation of the resin pipe joint by the inner ring press-fitting jig.

FIG. 9 is a semi-longitudinal side view showing a completed state of the inner ring press fitting operation of the resin pipe joint by the inner ring press fitting jig.

FIG. 10 is a semi-longitudinal side view showing another embodiment of the inner fitting press-fitting jig for the resin pipe joint according to the present invention.

FIG. 11 is a longitudinal sectional side view showing an example of a resin pipe joint.

FIG. 12 is a longitudinal sectional side view of an inner ring insertion device conventionally used.

FIG. 13 is a vertical sectional side view of a main part showing an insertion state of the inner ring insertion device.

[Explanation of symbols]

 8 Inner Ring 10 Resin Pipe 10a End of Pipe 30 Holder 30a Large Diameter 30b Small Diameter 31 Large Diameter Member 31a Small Diameter Tip 31b Large Diameter Rear End 31c Stopper 34 Resin Coating Layer

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[Procedure amendment]

[Submission date] August 9, 2000 (200.8.9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Inner ring press fitting jig for resin pipe joint

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for press-fitting an inner ring of a resin pipe joint, and more particularly, to a jig used in manufacturing processes in various technical fields such as semiconductor manufacturing, medical care, pharmaceutical manufacturing, food processing, and chemical industry. In one end of the resin pipe, which is one connecting member of the resin pipe joint applied to the high purity liquid or ultrapure water piping, the sealing force and the retaining force between the pipe and the joint body are increased. The present invention relates to an inner ring press-fitting jig for a resin pipe joint used when press-fitting and fixing a sleeve-shaped inner ring for making the inner ring press.

[0002]

2. Description of the Related Art As an example of a resin-made pipe joint of this type, one having a configuration as shown in FIG. 11 is known. This figure 1
1 are made of, for example, PFA, PTFE, E
It comprises a tubular joint body 1 made of a resin having excellent properties of chemical resistance and heat resistance such as TFE, a sleeve-shaped inner ring 8, and a cap nut-shaped pressing ring 9.

The joint body 1 has a cylindrical receiving port 2 formed at one end in the axial direction, and forms a tertiary seal portion 5C, which will be described later, intersects the axis C at the entrance of the receiving port 2. An inclined seal surface 4 is formed, and an annular seal end surface 6 that forms a primary seal portion 5A, which will be described later, is formed in a deep portion of the receiving port 2. A cylindrical groove portion 7 forming the next seal portion 5B is formed, and a male screw portion 3 is formed on the outer periphery thereof.

The inner circumference of the sleeve-shaped inner ring 8 is formed to have the same inner diameter as the inner circumference of the resin tube 10 and the inner circumference of the body 1A of the joint body 1, so that the movement (flow) of the fluid is not hindered. It is formed and has a fitting portion 11 at its inner end which can be fitted to the socket 2 of the joint body 1, and a distal end portion of a tube material press-fitting portion 12 formed continuously with the fitting portion 11. A bulged portion 13 having a mountain-shaped cross section is formed on the outside of the side,
By press-fitting the press-fitting portion 12 into one end of the pipe material 10 and fixing the fitting portion 11 in a state where the fitting portion 11 protrudes from one end portion of the pipe material 10,
The outer peripheral sealing surface 14 is formed so that the peripheral wall portion of the joint body 1 is enlarged in diameter and abuts the inclined sealing surface 4 formed at the entrance of the receiving port 2 of the joint body 1 from the axial direction to form the tertiary seal 5C. An insertion portion 15 for the tube material 10 to be inserted into the socket 2 of the joint body 1 is formed.

When the insertion portion 15 of the tube 10 is inserted into the socket 2 of the joint body 1, the annular seal is inserted into the fitting portion 11, which is a protrusion of the inner ring 8 from the tube 10. A protruding inner end face 16 is formed in contact with the end face 6 from the axial direction to form the primary seal portion 5A, and the protruding inner end face 16 and the annular seal end face 6 are sequentially reduced in diameter toward their inner peripheral sides. At the radially outer position of the protruding inner end surface 16 formed by this tapered surface, the protruding inner end surface 16 protrudes outward in the axial direction from the protruding inner end surface 16 and is pressed into the cylindrical groove portion 10. The cylindrical seal portion 17 forming the secondary seal portion 5B is integrally formed so as to protrude.

[0006] The cap nut-shaped pressing ring 9 has a female threaded portion 18 which is screwed into the male threaded portion 3 of the joint body 1 on the inner peripheral surface of the cylindrical portion 9A, and the cylindrical portion 9A.
An annular pressing portion 9B extending toward the axial center side and pressing the tube material 10 from the outside thereof is integrally connected to the outer end of the annular pressing portion 9B. A pressing edge 9C is formed at the inner end position of the annular pressing portion 9B. Have been.

In the resin pipe joint having the components 1, 8, 9 as described above, the press-fit portion 1 of the inner ring 8 is used.
2 is press-fitted into one end of the tube material 10 and fixed, and the peripheral wall portion of the tube material 10 corresponding to the bulging portion 13 formed in the press-fit portion 12 is enlarged in diameter, so that the tube members 8 and 10 are integrally joined to each other. The insertion part 15 of 10 is formed. Then, the insertion portion 15 of the tube material 10 is inserted into the socket 2 of the joint body 1 and the cylindrical seal portion 17 of the inner ring 8 is fitted to the joint body 1.
To the inside of the cylindrical groove 7 on the side.

Next, the female thread 18 of the push ring 9 loosely fitted to the outside of the tube 10 is screwed into the male thread 3 of the joint body 1 and the push ring 9 is screwed toward the joint body 1. The inner ring 8 is pressed from the axial direction by the pressing edge 9C of the annular pressing portion 9B.
The cylindrical seal portion 17 is press-fitted into the cylindrical groove portion 7 of the joint main body 1 to generate a radial surface pressure between the inner and outer peripheral surfaces of the two 17, 17 to form the axially long secondary seal portion 5B. Let it. Further, the axial length of the secondary seal portion 5B is increased by screwing and strongly tightening the pressing wheel 9, and the protruding inner end surface 1 on the inner ring 8 side is further increased.
6 is brought into contact with the annular seal end face 6 of the socket 2 on the joint body 1 side to generate an axial surface pressure between the two 16 and 6 to form a primary seal portion 5A. An outer peripheral sealing surface 14 of the insertion portion 15 of the pipe member 10 is made to abut against the inclined sealing surface 4 formed at the inlet of the receiving port 2 from the axial direction to form a tertiary seal portion 5C, thereby connecting the pipe member 10 to a joint. It is connected to the main body 1 in a retaining state and in a sealed state.

A jig for press-fitting and fixing the sleeve-shaped inner ring 8 into one end of the resin-made pipe member 10 at normal temperature in the resin-made pipe joint having the above structure is disclosed in, for example, Japanese Utility Model Laid-Open Publication No. Sho 62-134629. An inner ring insertion device as disclosed is known. The conventional inner ring insertion device, as shown in FIG. 12, provided with a clamp 21 for fixing and holding the tubing 10 at one end of the base arm 20, grayed <br/> lip to the other end of the base arm 20 A portion 22 and a toggle lever 23 pivotally attached to the grip portion 22 are provided. One end of the toggle lever 23 is engaged with an end of the toggle lever 23 and slides on a guide base 24 attached to the base arm 20. A feed member 27 having a feed arrow 26 capable of fitting and holding the inner ring 8 is attached to the other end of the slide shaft 25 movably biased in a direction away from the clamp portion 21 via a spring 28 so as to be movable. It is configured to be screwed and fixed.

According to the inner ring insertion device having such a structure, the tube member 10 is clamped by the clamp portion 21, while the inner ring 8 is fitted and held in the feed arrow 26 of the feed member 27, and the grip portion 22 is moved. By strongly pulling the grip toggle lever 23 against the elastic biasing force of the spring 28, the feed arrow 26 and the inner ring 8 are moved from one end of the tube 10 as shown in FIG.
Is inserted into the tube 10 and fixed. Then, after the insertion and fixing is completed, the toggle lever 23 is returned via the biasing force of the spring 28, so that the inner ring 8 is left in the tube 10 and the foot arrow 26 is pulled out from one end of the tube 10, so that the tube 10 The inner ring 8 is inserted and fixed in one end of the inner ring 8, and the peripheral wall portion of the tube material 10 corresponding to the bulging portion 13 formed in the press-fitting portion 12 of the inner ring 8 is expanded in diameter, so that the two 8, 10 are integrally joined. An insertion portion 15 for the tube 10 is formed.

[0011]

However, in the conventional inner ring insertion device having the above structure,
Even if there is a slight dimensional error such that the inner diameter of the pipe member 10 is slightly larger than the outer diameter of the feed arrow 26 of the feed member 27, the feed ring 26 and the inner ring 8 fitted and held therein are removed from the pipe member. There is a problem that the tip of the inner ring 8 or the inner peripheral surface of the tube 10 can be damaged by being unable to press-fit into the tube 10 or by forcibly inserting the tube 10 into the tube 10. On the other hand, if the outer diameter of the feed arrow 26 is made smaller than the inner diameter of the tube 10, the inner diameter of the inner ring 8 fitted and held is naturally smaller than the inner diameter of the tube 10. In the pipe material 10
A step occurs between the inner peripheral surface of the inner ring 8 and the inner peripheral surface of the inner ring 8, and this step tends to cause a liquid pool that is not preferable as a pipe joint when transporting a high-purity liquid or ultrapure water. Was.

When the inner ring insertion device is used, the end of the resin tube 10 is softened in advance by heating, and then the inner ring 8 is inserted into the end of the tube 10 via the feed arrow 26. It is possible to do
In this case, it is necessary to prepare a heating device such as a heater for heating, and after the press-fitting, it is necessary to wait until the pipe material 10 is cooled before making a connection. Another problem is that it takes time.

[0013] The present invention has been made in view of the above-described circumstances, and is capable of performing very efficient press-fitting and connection work without the need for preheating, etc., and also has an inner ring attached to the end of the pipe. Inner ring press-fitting of resin pipe joints that can be easily press-fitted and fixed to an appropriate expanded state without damaging the tip of the inner ring and the pipe material even if there is a slight change in diameter due to manufacturing errors etc. The purpose is to provide jigs.

[0014]

To achieve the above object, an inner ring press-fitting jig for a resin pipe joint according to the present invention comprises a sleeve-like inner ring (8) inside an end of a resin pipe material (10). For press-fitting and fixing the inner ring (8) by a relative movement in the axial direction with respect to the resin pipe (10), the tip of a holder (30) for inserting and holding the inner ring (8). Has its tip (3
The outer diameter (D1) of 1a) is smaller than the inner diameter (d1) of the resin pipe (10), and the rear end (31)
The outer diameter dimension (D2) of b) is larger than the outer diameter dimension (d2) of the tip of the inner ring (8), and the resin pipe material (10)
The expanding member (31) for plastically deforming the end portion (10a) of the resin pipe material (10a) in the expanding direction in accordance with the pushing movement to the end portion (10a) is detachably fixed and held. It is characterized by the following.

According to the present invention, the inner ring is inserted and held in the holder, and the enlarged diameter member is fixedly held at the tip of the holder. The jig is advanced so that the holder is pressed toward the end of the resin tube material to which the fixed member is fixed, so that the enlarged-diameter member enters the resin tube material from the tip end, and the end of the tube material is removed. It is plastically deformed in the expanding direction. Then, the jig is retracted, the enlarged member is extracted from the resin pipe, and after removing the enlarged member from the tip of the holder, the jig is moved forward again to make the holder and the inner ring the enlarged resin member. By pressing and moving a predetermined amount from the end of the tube material into the tube material and extracting only the holder, the work of press-fitting and fixing the inner ring into the end portion of the tube material is completed.

In the inner ring press-fitting jig for a resin pipe joint having the above-mentioned structure, the end of the diameter-expanding member increases in diameter as the resin tube is pushed into the end. When plastically deformed in the direction, the inner diameter of the resin tube is the same as or larger than the inner diameter of the inner ring. When removing and pushing the inner ring to the end of the tube, the end of the inner ring abuts against the inner peripheral surface of the tube, which may cause damage to the inner ring end and the inner peripheral surface of the tube. The inner ring can be easily and smoothly pressed into and fixed to the end of the tube material without generating.

In the inner ring press-fitting jig for a resin pipe joint having the above-mentioned structure, a stopper for limiting the amount of pushing into the resin pipe material may be provided at a rear end of the expanding member. The amount of plastic deformation in the tube axis direction and the diameter-enlarging direction at the end of the resin pipe material can be set to an appropriate value without variation.

In the inner fitting press-fitting jig for a resin pipe joint having the above-described structure, the entirety of the holder and the enlarged diameter member may be formed in consideration of a manufacturing surface and a handling surface. It is preferable to be made of a resin material. When a resin material is used, it is usually desirable to use inexpensive polypropylene (PP) or the like.
In addition to the above, a combination of fluorine resin materials such as polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), and PFA may be used. Of these constituent members, particularly, the diameter-enlarged member can be made of a fluorine resin as described in claim 5, so that the coefficient of friction between the diameter-enlarged member and the pipe can be reduced. Further, the pushing movement for expanding the diameter of the end portion of the tube can be performed more smoothly.

Furthermore, in order to ensure the strength of the jig when a small-diameter pipe joint is used, the holder is made of a metal material and the outer peripheral surface thereof is coated with a resin. Thereby, while ensuring necessary strength, adhesion of metal ions can be prevented, and the inconvenience of mixing impurities during transportation of a high-purity liquid or ultrapure water used in a semiconductor manufacturing process can be solved.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a semi-longitudinal side view of an inner ring press-fitting jig for a resin pipe joint according to the present invention. This inner ring press-fitting jig A has an axially straight large-diameter portion 30a for inserting and holding an inner ring 8. A small-diameter portion 30b integrally formed to project forward from the front end side of the feed member 27 in the inner ring insertion device described in FIG. And a mounting shaft portion 30c which can be fixed by a set bolt 33 and which is entirely formed integrally from a resin material such as PP, and removably fitted to a small-diameter portion 30b of the holder 30. It is composed of a fixed diameter member 31 made of resin such as PP fixed.

The outer diameter member (D1) of the distal end portion 31a in the axial direction of the diameter-enlarging member 31 is smaller than the inner diameter size (d1) of the resin tube material 10, and the rear end portion in the axial direction thereof. The outer diameter dimension (D2) of the inner ring 31 is formed in a conical shape larger than the outer diameter dimension (d2) of the front end portion 8a of the inner ring 8, and the rear end portion 31b is pushed into the resin tube material 10 at the rear end portion 31b. Is integrally provided. As shown in FIG.
To, with the pushing movement of the end portion 10a of the resin pipe member 10, the end portion 10a of the resin pipe member 10 as it is plastically deformed in diameter direction, when such plastic deformation is made, resin pipe material The inner diameter (d3) of the inner ring 8 is equal to the inner diameter (d4) of the straight portion connected to the enlarged diameter end portion 10a of the inner ring 8.
It is formed so as to be the same as or slightly larger than it.

Next, the inner ring 8 is press-fitted into one end 10a of the pipe member 10 using the resin pipe joint inner ring press-fitting jig A having the above-described configuration and fixed. An operation of forming the insertion portion 15 of the joint will be described. (1) The holder 3 is inserted into the holding hole 27a formed at the tip of the feed member 27 in the inner ring insertion device shown in FIG.
0 the mounting shaft portion 30c inserted and on which is fixed by a set bolt 33, as shown in FIG. 2, is inserted and held the inner ring 8 into the large diameter portion 30a of the holder 30. (2) In this state, as shown in FIG.
The large-diameter member 31 is fitted and fixed to the small-diameter portion 30b. (3) Next, as shown in FIG. 4, the tube 10 is clamped by the clamp portion 21 in the inner ring insertion device shown in FIG . (4) Subsequently, the grip portion 22 of the inner ring insertion device
The grip toggle lever 23 is pulled strongly against the elastic biasing force of the spring 28, as shown in FIG. 5, by advancing movement toward the end portion 10a of the tubing 10 of the press-fitting jig A, expansion The diameter member 31 has a small diameter side tip portion 31a.
, And is pushed into the one end portion 10a of the tube material 10, whereby the one end portion 10a of the tube material 10 is plastically deformed in the radially expanding direction. At this time, the inner diameter (d3) of the straight portion connected to the enlarged one end 10a of the resin tube 10 is equal to or slightly larger than the inner diameter (d4) of the inner ring 8. (5) Thereafter, the grip portion 22 of the inner ring insertion device
Is released to return the toggle lever 23 via the urging force of the spring 28, the jig A moves backward, and the diameter-enlarging member 31 moves, as shown in FIG.
Get out of In this extracted state, the holder 30
The large diameter member 31 fitted and fixed to the small diameter portion 30b is removed from the holder 30 as shown in FIG. (6) Then, strongly depressed against the toggle lever 23 grip the grip portion 22 of the inner ring inserting apparatus again to the elastic biasing force of the spring 28, as shown in FIG. 8,
The inner ring 8 inserted and held in the holder 30 is inserted into the one end 10a of the tube 10 by moving the press-fitting jig A forward toward the enlarged diameter end 10a of the tube 10, and then the holder 30 is extracted. Thus, as shown in FIG. 9, the operation of press-fitting and fixing the inner ring 8 into the one end portion 10 a of the pipe member 10 is completed.

As described above, the end 10 of the resin pipe 10
By simply moving the jig A twice in the axial direction with respect to the tube 10 without requiring preheating or the like to the inner ring 8, the end 10 a of the tube 10 is always appropriately and uniformly expanded in diameter to form the inner ring 8. Can be easily and smoothly press-fitted into the end portion 10a of the tube material 10, and the inner diameter (d4) of the inner ring 8 can be the same as or slightly larger than the inner diameter (d3) of the tube material 10. Even if there is a manufacturing error or the like, it is possible to reliably avoid a situation that is unfavorable for the pipe joint, such as damaging the tip of the inner ring 8 or the inner peripheral surface of the pipe 10.

In the above embodiment, the entire holder 30 and the enlarged diameter member 31 are made of a resin material such as PP for a large diameter pipe joint having a large diameter of the pipe member 10 and the joint body. However, by forming the expanding member 31 from a fluorine resin material such as PET, PTFE, or PFA, the coefficient of friction between the expanding member 31 and the tube 10 is reduced, and the end 10a of the tube 10 is expanded. When the diameter is increased, the push-in movement of the enlarged diameter member 31 with respect to the tube material 10 can be performed more smoothly.

In the case of a small-diameter pipe joint where both the pipe member 10 and the joint body are small, as shown in FIG.
Is formed of a metal material such as SUS304, and by applying a fluorine resin coating layer 34 on the outer peripheral surface of the metallic material holder 30, for example, the metal ions can be transferred to the outer peripheral surface while sufficiently securing the strength of the holder 30. Adhesion can be prevented, and the inconvenience of mixing impurities during transportation of high-purity liquid or ultrapure water used in the semiconductor manufacturing process can be solved.

[0026]

As described above, according to the present invention, the end of the resin pipe is expanded and plastically deformed while the end is kept cold, without requiring any equipment and labor such as preheating the pipe. Since the inner ring only needs to be press-fitted into the end of the expanded tube, the operation from the diameter expansion of the end of the tube and press-fitting of the inner ring to the connection as a pipe joint can be made very efficient. Moreover, even if the inner diameter of the inner ring is the same as or slightly larger than the inner diameter of the tube,
The inner ring can be easily and smoothly pressed into the end of the tube material without damaging them, and in addition, the degree of diameter expansion of the tube material is always uniform and appropriate, so that excessive diameter expansion and unevenness can be achieved. Enlargement of the diameter can be prevented. Therefore, there is an effect that the inner ring can be easily press-fitted and fixed to one end of the pipe material with a simple operation.

In particular, by forming the entire holder and the diameter-enlarged member from a resin material, excellent effects can be obtained in corrosion resistance and chemical resistance during transportation of a high-purity liquid or ultrapure water used in a semiconductor manufacturing process. Can be.

Further, by forming the diameter-expanding member of the holder and the diameter-expanding member from a fluororesin material, it is possible to reduce the friction coefficient between the diameter-expanding member and the resin tube at the time of expanding the end of the tube material. As a result, the push-in movement of the diameter-enlarging member into the pipe material can be performed more smoothly.

Further, when a small-diameter pipe joint is used, the holder is made of a metal material, and the outer peripheral surface of the holder is coated with a resin such as a fluorine resin. While ensuring the strength, the adhesion of metal ions is prevented, and the inconvenience of mixing impurities during transportation of a high-purity liquid or ultrapure water used in a semiconductor manufacturing process can be solved.

[Brief description of the drawings]

FIG. 1 is a semi-longitudinal side view showing an inner ring press fitting jig of a resin pipe joint according to the present invention.

FIG. 2 is a semi-longitudinal side view showing a set state of a holder before a press fitting operation of the resin pipe joint by an inner ring press fitting jig.

FIG. 3 is a semi-longitudinal sectional side view showing a state in which a large diameter member is attached to a holder before a press fitting operation of the resin pipe joint by an inner ring press fitting jig.

FIG. 4 is a semi-longitudinal sectional side view showing a first state of the resin pipe joint at the time of expanding the diameter of the end of the pipe material by an inner ring press-fitting jig.

FIG. 5 is a semi-longitudinal side view showing a second state of the resin pipe joint in the second state at the time of expanding the diameter of the end of the pipe material by the inner ring press-fitting jig.

FIG. 6 is a semi-longitudinal sectional side view showing a state at the time of completion of the work of expanding the end of the pipe material by the inner ring press-fitting jig of the resin pipe joint.

FIG. 7 is a semi-longitudinal side view showing a state before the inner ring press fitting operation of the resin pipe joint by the inner ring press fitting jig.

FIG. 8 is a semi-longitudinal side view showing a state at the time of inner ring press-fitting operation of the resin pipe joint by the inner ring press-fitting jig.

FIG. 9 is a semi-longitudinal side view showing a completed state of the inner ring press fitting operation of the resin pipe joint by the inner ring press fitting jig.

FIG. 10 is a semi-longitudinal side view showing another embodiment of the inner fitting press-fitting jig for the resin pipe joint according to the present invention.

FIG. 11 is a longitudinal sectional side view showing an example of a resin pipe joint.

FIG. 12 is a longitudinal sectional side view of an inner ring insertion device conventionally used.

FIG. 13 is a vertical sectional side view of a main part showing an insertion state of the inner ring insertion device.

[Description of Signs] 8 Inner ring 10 Resin pipe 10a End of pipe 30 Holder 30a Large diameter 30b Small diameter 31 Large diameter member 31a Small diameter tip 31b Large diameter rear end 31c Stopper 34 Resin coating layer

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

FIG. 5

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 13

Claims (6)

[Claims] An inner ring press-fitting jig for a resin-made pipe joint for press-fitting and fixing a sleeve-shaped inner ring into an end portion of a resin-made pipe by relative movement in an axial direction with respect to the resin-made pipe. The outer diameter of the tip of the holder to be inserted and held is smaller than the inner diameter of the resin tube, and the outer diameter of the rear end of the holder is smaller than the outer diameter of the tip of the inner ring. A resin expanding member that is plastically deformed in an expanding direction with an end portion of the resin tube material in a direction in which the resin tube material is pushed into the end portion of the resin tube material is detachably fixed and held. Inner ring press fitting jig for pipe fittings. 2. The method according to claim 1, wherein the expanding member is plastically deformed in an expanding direction in accordance with a pushing movement toward an end of the resin tube, whether an inner diameter of the resin tube is equal to an inner diameter of the inner ring,
The inner fitting press-fitting jig for a resin-made pipe joint according to claim 1, wherein the jig is formed in a conical shape larger than that. 3. A jig for press-fitting an inner ring of a resin-made pipe joint according to claim 1, wherein a stopper is provided at a rear end of the enlarged diameter member to limit an amount of pushing into the resin-made pipe. . 4. The inner ring press-fitting jig for a resin pipe joint according to claim 1, wherein both the entire holder and the enlarged diameter member are made of a resin material. 5. The inner fitting press-fitting jig for a resin pipe joint according to claim 4, wherein the enlarged diameter member of the holder and the enlarged diameter member is made of a fluorine resin. 6. The inner ring press-fitting jig according to claim 1, wherein the holder is made of a metal material, and an outer peripheral surface of the holder is coated with a resin.