JP2519080Y2 - Resin pipe fittings - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention relates to a resin pipe joint,
Excellent sealability can be secured regardless of the temperature fluctuation of the fluid,
Moreover, the present invention relates to a resin pipe joint having flow path characteristics applicable to pipes for high-purity liquid and ultrapure water.

[0002]

2. Description of the Related Art As a conventional resin pipe joint of this type, for example, one shown in FIG. 3 is known. In the figure, A is a tubular joint body, and a seal portion a1 formed of a tapered surface gradually decreasing in diameter in the axial direction is formed at the inlet of the receiving end into which the one-end insertion portion b1 of the pipe material B is inserted. This seal part
An outer ring D having a seal portion d1 that contacts a1 at its inner end is fitted to the outside of the insertion portion b1 of the pipe material B, whereby the pipe material B locally bulges radially inward b2, and the joint One end of the main body A has a male screw portion a2 and a female screw portion e1 of the push ring E.
The outer ring D is pressed toward the joint body A side by screwing the screw and screwing the screw to give a sealing force to the seal portions a1 and d1. Therefore, the pipe material B is restricted by the outer ring D that is axially immovably restrained by the joint body A and the push ring E to prevent the pipe material B from coming off. The invasion to the inside is prevented by the sealing force of the seal portions a1 and d1 and the sealing force generated when the inner surface of the outer ring D is pressed against the bulging portion b2.

A resin pipe joint shown in FIG. 4 is also known. In this pipe joint, a seal portion a1 formed by a tapered surface gradually decreasing in diameter in the axial direction is formed at the inlet of the receiving opening of the joint body A into which the insertion portion b1 of the pipe material B is inserted. An inner ring F having a peripheral wall f having a shape is press-fitted inside the insertion portion b1 of the pipe material B, whereby the pipe material B locally bulges radially outward along the peripheral wall f and the joint body A One end of the male threaded portion a2 is screwed into the female threaded portion e1 of the push ring E, and the threaded portion e1 is pushed to push the bulging portion b3 of the pipe B and the inner ring F toward the joint body A side to bulge the bulging portion b3. The inclined surface of the tube end side is pressed against the seal portion a1 to provide a sealing force. Therefore, in the pipe material B, the bulging portion b3 has the seal portion a1 of the joint body A and the pressing portion e of the push ring E.
2, and the peripheral wall f of the inner ring F prevents the fluid from leaking out and the foreign matter from entering the tubular material B from leaking into the tubular material B. This is prevented by the sealing force generated by pressing the pipe end side inclination of b3.

[0004]

However, in the conventional resin pipe joint shown in FIG. 3, the swelling portion b2 of the resin pipe material B undergoes stress relaxation over time during use. As a result, the sealing force between the inner surface of the outer ring D and the outer surface of the bulging portion b2 is reduced, impairing the sealing performance, and causing minute leakage of fluid. In particular, when the temperature of the fluid is high, the pipe material B is softened and the stress relaxation of the bulging portion b2 rapidly progresses. As a result, the sealing force between the inner surface of the outer ring D and the outer surface of the bulging portion b2 is shortened. Will be lowered and the fluid will leak. Further, due to the stress relaxation of the bulging portion b2 of the pipe material B, the pull-out strength of the pipe material B is remarkably reduced, and the pipe material B becomes in a state of being easily pulled out.

Further, in the conventional resin pipe joint shown in FIG. 4, the spontaneous stress relaxation of the pipe material B at room temperature is shown in FIG.
Since the inner ring F is slightly less than that of the resin, the inner ring F made of resin is directly exposed to the fluid when the temperature of the fluid is high. Therefore, the stress relaxation of the inner ring F becomes remarkable, the force pressing against the bulging portion b3 of the pipe material B decreases, and the sealing force at the portion at the seal portion a1 and the portion at the pressing portion e2 of the push ring E is lost, and the fluid Will be leaked. Moreover, due to the stress relaxation of the inner ring F, the pull-out strength of the pipe material B is lowered, and the pipe material B is easily removed.

Further, in both of the resin pipe joints of FIGS. 3 and 4, the bulging portion b2 or the inner ring F locally reduces the diameter of the pipe material B, which greatly changes the cross section of the flow path, so that the fluid flow is smooth. The movement is hindered, and particularly in the joint shown in FIG. 4, a phenomenon occurs in which the fluid stays in a small gap between the outer surface of the peripheral wall f of the inner ring F and the inner surface of the bulging portion b3. Therefore, it is unsuitable as a joint that requires smooth fluid movement in order to continuously supply a high-purity liquid or ultrapure water without fluid retention, and is subject to restrictions in use.

The present invention has been made in view of the above circumstances, and is capable of exerting an extremely strong retaining force, and even if the fluid is a high temperature fluid or a fluid whose temperature fluctuates drastically, the fluid leaks due to stress relaxation. The purpose of the present invention is to provide a resin pipe joint that can prevent the occurrence of the above and can secure a reliable sealing property for a long period of time, and can also be suitably used as a high-purity liquid or ultrapure water. There is.

[0008]

In order to achieve the above object, a resin pipe joint according to the present invention is press-fitted into one end portion of the pipe material so as to protrude from the one end portion of the pipe material to expand the one end portion of the pipe material. An inner ring that does not hinder the movement of the fluid to be diametrically shaped, a joint body that has a cylindrical receiving opening at one end for inserting the insertion part of the tubular material into which the inner ring is press-fitted, and protrudes from one end of the tubular material In order to bring the inner end seal part of the inner ring into contact with the inner part of the receiving port, a primary sealing part formed in the inner part of the receiving part in a shape intersecting with the axis of the receiving part, and the insertion part of the pipe material. And an outer ring having an inner end seal portion at its inner end, and an inner ring of the outer ring at the inlet of the receptacle so that the inner end seal portion of the outer ring contacts the inlet of the receptacle. A secondary seal part formed to intersect with the mouth axis and screwed onto one end of the joint body. , The insertion portion of the pipe member is sandwiched between the outer ring and the inner ring by being screwed to one end of the joint body, and the outer ring and the inner ring are pressed to seal the inner end of the outer ring. And a secondary seal portion of the receiving opening, an inner end seal portion of the inner ring, and a push ring that applies a sealing force to the primary sealing portion of the receiving opening.

[0009]

According to the resin pipe joint of the present invention, a strong sealing force is generated between the primary seal portion of the joint body and the inner end seal portion of the inner ring by screwing the push ring toward the one end portion of the joint body. At the same time, a strong sealing force is generated between the secondary seal portion of the joint body and the inner end seal portion of the outer ring, and the fluid leakage is reliably prevented. In addition, the inner ring is strongly clamped in the axial direction by the push ring and the primary seal part of the joint body, and the insertion part of the pipe material is strongly clamped in the axial direction as described above, so that the inner ring cannot move in the axial direction. Since it is strongly sandwiched by the inner ring and the outer ring that is pressed directly against the push ring, stress relaxation of the inner ring and the insertion part of the pipe material is significantly suppressed even for high temperature fluids and fluids with severe temperature fluctuations. Therefore, fluid leakage at the primary seal part and secondary seal part of the joint body is effectively prevented, and the decrease in drawing strength of the pipe material is also effectively prevented, and the pipe material is connected with a very strong retaining force. It becomes possible to do. Further, since the inner ring that does not hinder the movement of the fluid is press-fitted into one end of the pipe material, the fluid can be smoothly moved, and it can be suitably used as a pipe joint for high-purity liquid or ultrapure water. it can.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a cross-sectional view of a resin pipe joint according to an embodiment of the present invention. The resin pipe joint shown in FIG. 1 has chemical resistance such as PFA, PTFE, ETFE, CTFE, ECTFE, and the like. It is composed of a joint body 1, an inner ring 2, an outer ring 3 and a push ring 4 which are made of a resin having excellent heat resistance.

The joint body 1 is of a tubular shape, and has a receiving port 10 formed at least at one end thereof, and a first primary seal portion 11 intersecting with the axis C is formed at the inner part of the receiving port 10. At the same time, the secondary seal portion 12 that intersects the axis C is also provided at the inlet of the receiving port 10.
Are formed. In addition, on the outer periphery of the socket 10, a male screw part 13
Are formed. The inner diameter of the receiving port 10 is formed to be larger than the inner diameter of the body portion 14, and the inner diameter of the body portion 14 is gradually reduced toward the outer side in the inner portion of the receiving port 10 in the axial direction. The first primary seal portion 11 is formed by the taper surface extending to. On the other hand, the secondary seal portion 12 is formed by a tapered surface that gradually increases in diameter from the inner side of the receiving port 10 toward the outer side in the axial direction and reaches the root of the male screw portion 13. That is, the secondary seal portion 12 is formed at the inlet of the receiving port 10.

The inner ring 2 is formed with a fitting portion 20 having an outer diameter capable of fitting in the receiving port 10 of the joint body 1 at the inner end portion thereof, and the vicinity of the connecting portion with the fitting portion 20 is a pipe material. A press-fitting portion 21 having a small outer diameter corresponding to the thickness of 5 is formed continuously with the fitting portion 20, and has a sleeve shape as a whole.
The inner circumference of the inner ring 2 is formed to have the same diameter as that of the inner circumference of the pipe member 5 and the inner circumference of the body portion 14 of the joint body 1, that is, the same inner diameter or substantially the same inner diameter so as not to hinder the movement (flow) of the fluid. I have to. Further, an inner end seal portion 22 formed of a tapered surface, which abuts the first primary seal portion 11, is formed at the inner end of the inner ring 2.

On the other hand, on the outer periphery of the outer end portion of the press-fitting portion 21 of the inner ring 2, a taper whose diameter gradually increases from the outer end toward the inner end in the axial direction and the outer end intersects with the inner periphery of the inner ring 2. The outer edge seal portion 23 is formed, and the outer edge seal portion 23 is formed.
The maximum outer diameter of 23 is set to be the same as the outer diameter of the press-fitting portion 21. By press-fitting the press-fitting portion 21 of the inner ring 2 into one end of the pipe material 5, the peripheral wall of the one end of the pipe material 5 is expanded and the fitting portion 20 of the inner ring 2 projects from one end of the pipe material 5. In this state, the peripheral wall expanded portion of the pipe material 5 is integrally connected to the pipe material 5 and becomes the insertion portion 50 inserted into the receiving port 10 of the joint body 1. Also, this insertion part
In the state in which 50 is inserted into the receiving port 10 of the joint body 1, the inner end seal portion 22 is in contact with the first primary seal portion 11 of the joint body 1, and the outer end seal portion 23 is inserted portion. Although it is in contact with the inner surface of the inclined portion 51 of the pipe 50, the outer peripheral surface of the pipe member 5 does not come into contact with the secondary seal portion 12 of the joint body 1.

The outer ring 3 is a portion 50 into which the pipe member 5 is inserted.
Has an inner diameter to be externally fitted to and a smaller outer diameter than the inner diameter of the cylindrical portion 40 of the push ring 4 screwed into the male screw portion 13 of the joint body 1, and the inner end thereof has the joint body 1 Secondary seal part
An inner end sealing surface 30 formed of a tapered surface that abuts 12 is formed, and an outer end portion 31 is orthogonal to the axis C and a pressing piece 42 of the pressing wheel 4.
Is formed so as to abut against the inner end surface 43 of the.

The push ring 4 has a female thread portion 41 threadedly engaged with the male thread portion 13 of the joint body 1 on the inner peripheral surface of the cylindrical portion 40, and has an annular shape extending to the axial center side at the outer end portion. The pressure piece 42 is formed. A pressing edge portion 44 is formed on the inner end of the pressing piece 42 on the inner surface side. The formation position of the pressing edge portion 44 is set on the axial center side of the outer diameter of the fitting portion 20 of the inner ring 2. The inner end surface 43 of the pressing piece 42 of the pressing wheel 4 functions as a pressing surface for pressing the outer ring 3, and therefore the pressing wheel 4 moves the inner ring 2 to the joint body 1 side through the pipe material 5. While pressing (specifically, the fitting body 1 and the inner ring 2 are pressed against each other), the outer ring 3 is pressed to the fitting body 1 side (specifically, the fitting body 1 and the outer ring 3 are pressed against each other), and the fitting body 1 and the inner The ring 2, the outer ring 3 and the pipe member 5 are held in an integrally connected state, and the inner end sealing portion 22 of the inner ring 2 and the primary sealing portion 11 of the receiving port 10 and the inner end sealing surface 30 of the outer ring 3 and the receiving port 10 are The secondary sealing portion 12 is provided with a sealing force.

In the resin pipe joint having the above-described structure, first, when the press-fitting portion 21 of the inner ring 2 is press-fitted into one end of the pipe material 5, the one end portion of the pipe material 5 has an overall diameter-increased insertion portion 50.
Becomes Then, the inner ring 2 and the one end insertion portion 50 of the pipe member 5 press-fitted into the one end portion of the pipe member 5 in this manner.
Is inserted into the receiving port 10 of the joint body 1 to bring the inner end seal portion 22 into contact with the first primary seal portion 11, and then the inner end seal surface 30 of the outer ring 3 which is loosely fitted to the pipe member 5 in advance. After abutting against the secondary seal portion 12 of the joint body 1, the female thread portion 41 of the push ring 4 is screwed onto the male thread portion 13 of the joint body 1 and is screwed forward to strongly tighten the pipe material 5. Joint body 1
Can be connected to. In this case, the retaining force for the pipe material 5 is that the inserting portion 50 is the press-fitting portion of the inner ring 2.
21 and the inner peripheral surface of the outer ring 3, and the outer end seal portion 23 of the inner ring 2 and the pressing edge portion 44 of the pressing wheel 4 are sandwiched.
Also occurs due to local pinching, so that the pipe member 5 is held with a strong retaining force to prevent its detachment movement.

Further, when the push ring 4 is screwed forward and strongly tightened, the first primary seal portion 11 of the joint body 1 and the inner end seal portion 22 of the inner ring 2 are brought into pressure contact with each other, and a strong adhesive force is generated therebetween. At the same time, the secondary seal portion 12 of the joint body 1 and the inner end seal surface 30 of the outer ring 3 are pressed into contact with each other to generate a strong adhesive force, and further, the outer end seal portion 23 of the inner ring 2 and the second primary seal. The inner surface of the slanted portion 51 of the tubular material 5 as a part of the tubular material 5 is pressed against each other to generate a strong sealing force therebetween, and sealing is performed on both the outer circumference and the inner circumference of one end of the tubular material 5. Therefore, in this resin pipe joint, a primary seal is formed between the joint body 1 and the inner ring 2 and between the inner ring 2 and the pipe material 5, and a secondary seal is formed between the joint body 1 and the outer ring 3. Since it is formed, it is possible to secure excellent sealing property and reliably prevent fluid leakage or foreign matter intrusion.

Particularly, in the case of this resin pipe joint, the sealing force of the secondary seal formed between the joint body 1 and the outer ring 3 is higher than the proportion of the sealing force of the primary seal, and 1. Even if a problem occurs in the primary seal due to creep due to heat cycle or the like, the secondary seal prevents leakage of fluid or intrusion of foreign matter, resulting in extremely high reliability of the seal. In addition, in the case of this resin pipe joint, since the axial pressing force is applied by the cooperation of the joint body 1 and the push ring 4 in all of the three seal portions, the temperature of the fluid is high, not to mention at room temperature. Even in this case, it is possible to suppress the breakage of the seal due to the stress relaxation and to secure the excellent sealing property.

Further, the inner circumference of the inner ring 2 is formed to have the same diameter as the inner circumference of the pipe member 5 and the inner circumference of the body portion 14 of the joint body 1 so as not to hinder the movement of the fluid. Since the passage cross-section becomes uniform and the flow passage characteristics for smooth movement of the fluid can be secured without staying, it can be applied as a joint for high-purity liquid or ultrapure water.

As shown in FIG. 2, the secondary seal portion 12 of the joint body 1 and the inner end seal surface 30 of the outer ring 3 are two pressure contact surfaces 121, which are orthogonal to the axis C and axially displaced. 12
You may form in step shape which has 2,301,302.

[0021]

As described above, according to the present invention, a strong sealing force is generated between the primary seal portion of the joint body and the inner end seal portion of the inner ring to form the primary seal, and the joint body is also provided. Since the secondary seal can be formed by generating an extremely strong sealing force between the secondary seal part of the above and the inner end seal part of the outer ring that is directly pressed by the push ring, these primary and secondary seals can be formed. Thus, fluid leakage can be effectively prevented. Especially, since the sealing force of the secondary seal is higher than that of the primary seal, stress applied to high temperature fluids and fluids with severe temperature fluctuations will relax the stress on the inner ring and tube insertion part, and Even if a problem occurs in the sealability of the seal portion, the secondary seal can reliably prevent fluid leakage and intrusion of foreign matter, and ensure highly reliable sealability for a long period of time. Moreover, the inner ring, which is axially sandwiched by the push ring and the primary seal portion of the joint body and is immovable in the axial direction, and the outer ring, which is directly pressed by the push ring, firmly sandwiches the tube material insertion portion. Therefore, it is possible to effectively prevent the reduction of the drawing strength of the pipe material and to connect the pipe material with a very strong retaining force. Further, since the inner ring that does not hinder the movement of the fluid is press-fitted into one end of the pipe material, the fluid can be smoothly moved, and it can be suitably used as a pipe joint for high-purity liquid or ultrapure water. it can.

[Brief description of drawings]

FIG. 1 is a sectional view of a resin pipe joint according to an embodiment of the present invention.

FIG. 2 is a half cross-sectional view showing a modified example of the resin pipe joint of FIG.

FIG. 3 is a half sectional view of a conventional example.

FIG. 4 is a half-cut sectional view of still another conventional example.

[Explanation of symbols]

 1 Joint body 2 Inner ring 3 Outer ring 4 Push ring 5 Tubing 10 Receptacle 11 Primary seal part 12 Secondary seal part 13 Male thread part of the joint body 22 Inner ring inner end seal part 30 Outer ring inner end seal part 41 Push ring Female thread 50 Insertion part C Receptacle axis

Claims (1)

(57) [Scope of utility model registration request] 1. An inner ring that does not impede the movement of a fluid that press-fits into one end of the pipe to expand the one end of the pipe in a state of protruding from the one end of the pipe, and inserts the pipe into which the inner ring is press-fitted. In order to abut the inner joint portion of the inner ring projecting from one end of the pipe member with the joint main body in which the tubular receiving end for inserting the portion is formed at one end, A primary seal part formed in the inner part of the receiving port in a shape intersecting with the axis of the receiving port; an outer ring externally fitted to the inserting part of the pipe member; and an inner ring having an inner end sealing part, A secondary seal portion formed at the inlet of the receptacle so as to contact the inner end seal portion of the outer ring with the inlet of the receptacle, and a secondary seal portion formed in a cross shape with the axis of the receptacle, and at one end of the joint body. The fitting portion of the pipe material is screwed into the fitting body by screwing the fitting body to one end of the fitting body. The outer ring and the inner ring by pressing the outer ring and the inner ring, and the inner ring seal portion of the outer ring and the secondary seal portion of the receptacle, and the inner ring seal portion of the inner ring and the inner ring seal portion. A resin pipe joint, comprising: a push ring that applies a sealing force to a primary seal portion of the receiving port.