JPH0720471Y2 - Resin pipe fitting - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention relates to a resin pipe joint, and can secure excellent sealability regardless of the temperature fluctuation of the fluid, and is also applicable to piping for high purity liquid or ultrapure water. The present invention relates to a resin pipe joint having characteristics.

[0002]

2. Description of the Related Art As a resin pipe joint, for example, one shown in FIG. 5 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. The outer ring D having a seal portion d1 that contacts the seal portion a1 at the inner end is
It is fitted on the outside of the insertion part b1 of the
Locally bulges radially inwardly b2, and the joint body A
A male screw portion a2 of one end is screwed with a female screw portion e1 of the push ring E, and by pushing this, the outer ring D is pressed toward the joint body A side, and a sealing force is applied to the seal portions a1 and d1. Has been done. Therefore, the pipe material B is composed of the joint body A and the push ring E.
The outer ring D is restrained by the axially immovable restraint by the outer ring D so that the outer ring D is prevented from coming off, and the external leakage of the fluid in the pipe material B and the intrusion of foreign matter into the pipe material B are caused by the seal portions a1, d1. And the sealing force generated by the inner surface of the outer ring D being pressed against the bulging portion b2.

A resin pipe joint shown in FIG. 6 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]

An invention to be Solved] However, in the conventional resin pipe joint shown in FIG. 5, while it is used, cause stress relaxation over time the bulging portion b2 of the resin tubular material B 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 softens and the stress relaxation of the bulging portion b2 rapidly progresses, and 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 short-term. of
It will drop with use and the fluid will leak. Further, the stress relaxation of the bulging portion b2 of the pipe material B allows the pipe material B to be
The pull-out strength of No. 2 is remarkably reduced, and the pipe material B becomes very easy to come off.

Further, in the conventional resin pipe joint shown in FIG. 6, the spontaneous stress relaxation of the tubing B at room temperature 5
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.

[0006] In addition, both of FIGS. 5 and 6, the bulging portion
The diameter is locally reduced by b2 or the inner ring F, and the flow passage cross section is largely changed, which hinders smooth movement of the fluid. Particularly, in the joint of FIG. 6 , the outer surface of the peripheral wall f of the inner ring F and the bulging portion are hindered. The phenomenon that the fluid stays in a small gap with the inner surface of b3 occurs. 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 has a strong retaining force and a high temperature fluid or temperature fluctuation.
Shii even when applied to a fluid pipe, the fluid due to stress relaxation
It is an object of the present invention to provide a resin pipe joint that can suppress leakage and ensure excellent sealing properties for a long period of time , and can also be suitably used for high-purity liquids and ultrapure water.

[0008]

SUMMARY OF THE INVENTION A resin pipe joint of the present invention is an inner pipe which does not impede the movement of a fluid that press-fits into one end of the pipe material so as to project from the one end of the pipe material to expand the one end portion of the pipe material. A ring, a joint body having a tubular receiving opening formed at one end for inserting the insertion portion of the tubular material into which the inner ring is press-fitted, and an inner end seal portion of the inner ring protruding from the one end of the tubular material. a primary sealing portion which is formed at the intersection shape with the axis of the socket in the inner part of the socket in order to abut against the inner portion of the socket and screwed to one end portion of the joint body, the joint body the screwed to one end portion is obtained by and a junk ring providing sealing force to the primary sealing portion of the inner end sealing portion and the socket of the inner ring is pressed from the outside of the inner ring tubing.

[0009]

[Operation] 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 due to the thrusting of the push ring to one end portion of the joint body.
Fluid leakage is prevented. Moreover, the inner ring is strongly clamped in the axial direction by the push ring and the primary seal portion of the joint body, and the insertion portion of the pipe material is also strongly clamped by the inner ring and the push ring that are strongly clamped in the axial direction. Therefore, stress relaxation is greatly suppressed at the inner ring and the insertion part of the pipe material even if it is a high-temperature fluid or a fluid with severe temperature fluctuations, and therefore fluid leakage at the primary seal part of the joint body is effective. In addition to being prevented, reduction in pulling strength of the pipe material is effectively prevented. 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]

1 is a half sectional view of a resin pipe joint according to an embodiment of the present invention. The resin pipe joint shown in FIG.
It is composed of a joint body 1, an inner ring 2 and a push ring 4 which are made of a resin having excellent chemical resistance and heat resistance such as FA, PTFE, ETFE, CTFE and ECTFE.

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, the outer circumference of the outer end portion of the inner ring 2, that is, the outer circumference of the press-fitting portion 21, has a tapered shape in which the diameter gradually increases from the outer end toward the inner end in the axial direction and the outer end intersects with the inner circumference of the inner ring 2. The outer end seal portion 23 is formed, and the diameter of the top portion of the outer end seal portion 23 is set to be larger than at least the outer diameter of the press-fitting portion 21 at the connection portion with the fitting portion 20, and in the illustrated example, the inner ring is formed. 2 mating parts
Being larger than 20 OD. That is, the large diameter side of the outer end seal portion 23 is a bulging portion 24 having a chevron cross section formed on the outer peripheral surface of the inner ring 2 on the outer end portion side. The taper surface 25 that gradually decreases in diameter from the top of the bulging portion 24 toward the inner end of the inner ring 2 has an inclination angle that matches the inclination angle of the secondary seal portion 12 of the joint body 1 and has an inner end. When the seal portion 22 comes into contact with the first primary seal portion 11, the opposing interval between the secondary seal portion 12 and the tapered surface 25 is formed to correspond to the wall thickness of the pipe material 5. In the inner ring 2 thus configured, the press-fitting portion 21 is press-fitted into one end portion of the pipe material 5 to expand the peripheral wall of the one end portion of the pipe material 5 and the fitting portion 20 of the inner ring 2 has one end portion of the pipe material 5. With it protruding from
The pipe material 5 is integrally connected. At this time, the expanded diameter portion of the peripheral wall of the pipe member 5 becomes the insertion portion 50 which is inserted into the receiving port 10 of the joint body 1. Further, in the state where the insertion portion 50 is inserted into the receiving port 10, 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 in contact with the inner surface of the inclined portion 51 of the insertion portion 50. Further, one end of the pipe material 5 is held in an inclined state between the secondary seal portion 12 of the joint body 1 and the taper surface 25 of the inner ring 2. That is, the outer peripheral surface of the pipe member 5 deformed along the taper surface 25 of the inner ring 2 becomes the outer peripheral seal surface 5a and comes into contact with the secondary seal portion 12.

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 an annular ring 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 portion adjacent to the fitting portion 20 as well as the top portion of the bulging portion 24.

The pushing ring 4 thus constructed presses the inner ring 2 against the joint body 1 side through the pipe material 5 (more specifically, the joint body 1 and the inner ring 2 are pressed against each other).
At the same time, the pipe material 5 is pressed against the joint body 1 side (specifically, the joint body 1 and the pipe material 5 are pressed against each other) to hold the joint body 1, the inner ring 2 and the pipe material 5 in an integrally coupled state and The end seal part 22 and the primary seal part 11 of the receiving port 10 and the outer peripheral sealing surface 5a of the pipe 5 and the receiving port 10
The secondary sealing portion 12 is provided with a sealing force.

In the above structure, first, when the press-fitting portion 21 of the inner ring 2 is press-fitted into one end of the pipe member 5, the one end of the pipe member 5 is expanded in diameter as a whole and the position corresponding to the bulging portion 24 of the inner ring 2 is moved. The insertion portion 50 has a further increased diameter. Then, the inner ring 2 and the one-end insertion portion 50 of the pipe material 5 press-fitted into one end portion of the pipe material 5 in this manner are inserted into the receiving port 10 of the joint body 1 to make the inner end seal portion 22 the first primary seal. By abutting against the portion 11 and then screwing the female screw portion 41 of the push ring 4 which has been loosely fitted in the pipe material 5 in advance to the male screw portion 13 of the joint body 1, and by screwing this tightly,
The inner ring 2 is connected to the pressing edge portion 44 of the pressing wheel 4 and the joint body 1
The first primary seal part 11 of the
Thus, the pipe member 5 can be connected to the joint body 1.

By connecting the pipe member 5 in this manner, the insertion portion 50 of the pipe member 5 is sandwiched between the inner ring 2 and the push ring 4 which are axially sandwiched as described above, and the inner ring 2 is also sandwiched. It is also sandwiched by the press-fitting part 21 of the inner ring 2 and the secondary seal part 12 of the receiving port 10, and further, the outer end seal part of the inner ring 2.
The 23 and the pressing edge portion 44 of the pressing wheel 4 also receive the local clamping. Therefore, the pipe material 5 is held with a strong retaining force to prevent the detachment movement. In addition, when the push wheel 4 is screwed 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 outer peripheral seal surface 5a of the pipe member 5, and the outer end seal portion 23 of the inner ring 2 and the inner surface of the inclined portion 51 of the pipe member 5 that serves as the second primary seal portion are also formed. Each of them is pressed against each other to generate a strong sealing force between them, and a seal is formed on both the outer circumference and the inner circumference of one end of the pipe member 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, ensuring excellent sealability and preventing fluid leakage or leakage. Intrusion of foreign matter can be reliably prevented. Further, since a secondary seal is formed between the joint body 1 and the pipe material 5, even if a problem occurs in the primary seal due to creep or the like due to a heat cycle, the secondary seal can prevent the fluid from flowing. Leakage or entry of foreign matter is prevented, and the reliability of the seal is extremely high. Moreover, 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 , not only when the fluid is at room temperature , but also when the temperature is high, When in fluid
Even if there is, it is possible to suppress the breakage of the seal due to stress relaxation and ensure excellent sealing properties.

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.

In the resin pipe joint shown in FIG. 1, the inner end seal portion 22 of the inner ring 2 is formed as an inclined surface which is inclined at the same angle as the first primary seal portion 11 of the joint body 1. However, as shown in FIG. 2, the inner end seal portion 22 and the first primary seal portion 11 are made to have a different inclination angle, and the thrust force of the push wheel 4 is applied to these as shown in FIG. They may be pressed against each other. In this way, a strong sealing force can be concentrated particularly on the radially inner end portion 6, so that the function of suppressing the retention of the fluid is improved.

As shown in FIG. 4, the first primary seal portion
11 and the inner end seal portion 22 are formed in a cross shape orthogonal to the axis C, and the recess 7 is formed on one side (for example, the inner end seal portion 22) and the recess 7 is formed on the other side (first primary seal portion 11).
It is also possible to have a configuration in which the convex portion 8 that fits in is formed.

[0020]

As described above, according to the present invention , a strong sealing force can be generated between the primary seal portion of the joint body and the inner end seal portion of the inner ring, and this seal prevents fluid leakage. It can be effectively prevented. Moreover, the inn
Nail ring is firmly clamped in the axial direction by the push ring and joint body.
As a result, the softening of the inner ring due to the high temperature fluid
It was possible to sufficiently suppress the stress relaxation.
Therefore, even when applied to high-temperature fluids or fluids with drastic temperature fluctuations, they are caused by stress relaxation in the inner ring and the insertion part of the pipe material.
It is possible to effectively prevent fluid leakage at the location of the primary seal part of the joint body, and to effectively prevent lowering of the drawing strength of the pipe material , and to provide an excellent seal over a long period of time.
It is possible to secure the effect . 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 partial cross-sectional view for explaining the action of a modified example of the first primary seal portion and the inner end seal portion in the resin pipe joint of FIG.

FIG. 3 is a partial cross-sectional view for explaining the operation of the first primary seal portion and the inner end seal portion of FIG.

FIG. 4 is a partial cross-sectional view showing another modification of the first primary seal portion and the inner end seal portion.

FIG. 5 is a half cross-sectional view of a conventional example.

FIG. 6 is a half cross-sectional view of still another conventional example.

[Explanation of symbols]

1 Joint body 2 Inner ring 4 Push ring 5 Tubing 5a Outer peripheral sealing surface 10 Receptacle 11 Primary seal part 13 Male thread part of fitting body 22 Inner ring inner end seal part 24 Swelling part 41 Push ring female thread part 50 Insert part C receiving part Mouth axis

Claims (1)

[Scope of utility model registration request] 1. An inner ring that does not hinder the movement of a fluid that press-fits into one end portion of the pipe material to expand the one end portion of the pipe material in a state of protruding from the one end portion of the pipe material, and inserts the pipe material into which the inner ring is press-fitted. In order to bring the joint main body in which a tubular receiving opening for inserting the portion is formed at one end and the inner end seal portion of the inner ring protruding from the one end of the pipe member into contact with the inner portion of the receiving opening. a primary seal portion the inner portion of the socket is formed in the intersection shape with the axis of said receptacle, screwed to one end portion of the joint body, screwed by said inner ring of tubing to one end of the joint body A resin pipe joint comprising: an inner end seal portion of the inner ring and a push ring that applies a sealing force to the primary seal portion of the receiving port.