JP3189095B2 - Resin pipe fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin pipe joint, and more particularly, to a resin pipe joint used in a semiconductor manufacturing process in a service environment where chemical resistance and corrosion resistance such as pure water are required. The present invention relates to a resin pipe joint interposed at a connection point or a branch point of a fluid transport pipe.

[0002]

2. Description of the Related Art In a resin pipe joint of this kind, an end of a resin pipe is inserted and connected to an insertion port on the joint body side, and a male screw formed on the outer peripheral surface of the insertion port is press-fitted. By tightening the female member of a tightening member such as a screw member and tightening the tightening member, a structure is adopted that prevents accidental removal of the resin tube and at the same time ensures the sealing property of the connection portion. In general, in order to ensure that the function of preventing slipping out and ensuring the sealing performance is ensured, the surface pressure generated by the tightening by the tightening member must be maintained at the reference surface pressure. is important.

[0003] That is, if the tightening force of the tightening member is weak, the sealing performance is reduced and fluid leakage is likely to occur. Conversely, if the tightening force is too strong, the joint body is likely to be damaged. Usually, the connection is carried out while controlling the upper and lower limits of the tightening amount of the tightening member. Therefore, the management of the tightening amount is a very important factor when maintaining the performance of the resin pipe joint from the viewpoint of maintaining the performance.Conventionally, the tightening member is constantly measured while constantly measuring the tightening torque using a torque wrench. Tighten the screw by screwing it in a specified number of times while counting and grasping the number of rotations of the tightening member, or by screwing the tightening member little by little while repeatedly measuring the tightening dimensions with a clearance gauge etc. The means for managing was used.

[0004]

However, in the connection method by controlling the amount of tightening as described above, it is difficult to avoid the variation in the construction quality due to the individual difference of the construction workers and the damage to the joint body due to the excessive tightening. In addition, since it is necessary to use a dedicated jig or tool such as a torque wrench or a gap gauge, not only is it troublesome and requires skill, but also the workability is extremely poor. Furthermore, it is not possible to judge whether the tightening is appropriate or not by looking at the pipe joint after construction, and to know the fact that leakage has occurred only when flowing fluid after construction However, there is a possibility that a leak may occur after the connection is made. In this case, there is a problem that a troublesome operation such as temporarily stopping the flow of the fluid and retightening the fastening member is required.

The present invention has been made in view of the above-mentioned circumstances, and enables proper tightening management to be performed with good workability without using a dedicated jig or tool. It is an object of the present invention to provide a resin-made pipe joint capable of reliably preventing breakage of a pipe.

[0006]

In order to achieve the above object, a resin pipe joint according to the first aspect of the present invention provides an insertion port (2) into which an end of a resin pipe (1) can be inserted and connected. A reference plane (4) formed at the base of the insertion port (2) on the side of the joint body (3) having a vertical direction with respect to the axis thereof;
A ring-shaped member is formed between the coupling member (7) having a female screw portion (6) that can be screwed into a male screw portion (5) formed on the outer peripheral surface of the insertion opening (2) on the joint body (3) side. A resin pipe joint having a tightening restrictor (8) interposed therebetween,
The ring-shaped tightening restricting tool (8) is rotatably fitted and held outside the insertion port (2) on the joint body (3) side, and is connected to the ring-shaped tightening restricting tool (8). The surface facing the fastening member (7) in the axial direction is aligned with the circumferential direction of rotation.
Formed in a proper tightening range, starting from a position where they come into contact with each other with the screwing of the tightening member (7), and
A ring-shaped tightening restrictor (8) at the position where the tightening has further progressed
Are characterized in that mutual engaging portions (8A) and (7A) are formed so as to restrict the screwing movement of the fastening member (7).

According to the first aspect of the present invention, as the tightening member is screwed in, the tightening member is rotatably fitted to the outside of the insertion opening on the joint body side. serrated formed on the facing surfaces of the ring-shaped fastening restricting mechanism being
It is possible to visually judge that the mutual engagement portions formed of the protrusions come into contact with each other and start rotating together from this position and are in an appropriate tightening range. Further, at the position where the tightening by the tightening member is further advanced, the ring-shaped tightening restricting tool exerts a stopper function to restrict further screwing movement of the tightening member, so that the joint body side is damaged due to excessive tightening. And the like can be prevented, and proper tightening management can be performed with good workability without using a dedicated jig or tool.

Further, the mutual engagement portions of the above, because it is formed from the rotational circumferential sawtooth projections along the axis of the height-of serrations (projection amount) and with a ring-shaped fastening restricting mechanism By appropriately setting the thickness in the direction, it is possible to arbitrarily set an appropriate tightening range and a tightening limit.

According to the first aspect of the present invention, the ring-shaped tightening restricting tool is not only rotatably fitted to the outside of the insertion opening of the joint body, but is also axially moved by engaging means or the like. By adopting a configuration that keeps the ring-shaped tightening restricting tool from moving in the axial direction, the ring-shaped tightening restrictor is kept in contact with the reference surface formed at the base of the insertion opening of the joint body without moving in the axial direction. It is possible to prevent a change in the proper tightening range due to the intrusion of foreign matter between the two, and to always perform appropriate proper tightening management properly.

Further, in the resin pipe joint according to the third aspect of the present invention, the joint body (3) having an insertion port (2) into which an end of the resin pipe (1) can be inserted and connected is provided. A reference surface (4) formed at the base of the insertion port (2) perpendicular to the axis thereof and a male screw section (2) formed on the outer peripheral surface of the insertion port (2) on the joint body (3) side. 5) A resin-made pipe joint comprising a ring-shaped tightening restricting tool (8) interposed between a tightening member (7) having a female screw portion (6) that can be screwed into the ring-shaped member. Tightening control tool (8)
Has a notch (8a) at one location in the circumferential direction, is fitted and held outside the insertion port (2) on the joint body (3) side, and has a ring-shaped tightening restricting tool. At the initial position where the fastening member (7) and the fastening member (7) are in contact with each other with the screwing of the fastening member (7), the notch (8a) is kept in a closed posture on the axially opposed surface of the fastening member (8) and the fastening member (7). At the position where the tightening has progressed further and the two members have moved relative to each other in the axial direction by a certain amount in a state where the two members are still in contact with each other. Department (8
The present invention is characterized in that radial expansion force generating portions (8B) and (7B) for applying a radial expansion force to change a) to the open position are formed.

According to the third aspect of the present invention, the fastening member is fitted and held on the outside of the insertion opening on the joint body side with the screwing of the fastening member. At the initial position where the expanding force generating portion formed contacts the surface facing the ring-shaped tightening restrictor, the notch provided at one location in the circumferential direction of the ring-shaped tightening restrictor is maintained in the closed position. It is possible to visually or fumblingly judge that it is in the proper tightening range. Further, at a position where the tightening by the tightening member further proceeds and the two members remain in contact with each other and relatively move in the axial direction by a fixed amount, the expanding force generating portion applies a certain expanding force to the ring-shaped tightening restricting tool. By acting, the notched portion of the ring-shaped tightening restricting tool is changed to the open position, and such a change in the position of the notched portion can be easily determined visually or by groping. Therefore, by stopping further tightening by the tightening member, it is possible to prevent damage to the joint body side due to excessive tightening, etc., similarly to the invention of claim 1,
Appropriate tightening management can be performed with good workability without using tools.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are an external side view and a partial vertical side view of a resin pipe joint according to a first embodiment of the present invention. This resin pipe joint A has an insertion port 2 into which an end of a resin pipe 1 into which an inner ring 9 is inserted and fitted can be inserted and connected, at the base of the insertion port 2 on the joint body 3 side. A reference surface 4 perpendicular to the axis C is formed, and a male screw portion 5 is formed on the outer peripheral surface of the insertion port portion 2.

On the other hand, a cap nut-shaped fastening member 7 having a female screw portion 6 which can be screwed into the male screw portion 5 on the outer periphery of the insertion opening 2 on the joint body 3 side is connected to the female screw portion 6 on the joint body 3 side. When screwed into the male screw portion 5, a pressing portion 10 acting to press the resin tube 1 and the inner ring 9 inserted into the insertion port portion 2 toward the inside in the axial direction is integrally formed. Male thread 5 on the outer circumference of part 2
When the female screw portion 6 of the tightening member 7 is screwed in, the resin tube 1 and the inner ring 9 are pressed against the inner side in the axial direction via the pressing portion 10 so that the insertion port 2 on the joint body 3 side and the resin It is configured such that the sealing property of the connection portion with the pipe 1 is ensured and at the same time, the resin pipe 1 is prevented from being pulled out.

The reference surface 4 and the fastening member 7 on the joint body 3 side of the resin pipe joint A having the above basic structure.
And a ring-shaped tightening restricting tool 8 is interposed between them. The ring-shaped tightening restricting tool 8 is rotatably fitted and held on the outside of the insertion port 2 on the joint body 3 side with one end surface 8a in the axial direction abutting on the reference surface 4.
Although this ring-shaped tightening restricting tool 8 is not shown,
Via an engagement means such as engaging a projection projected outward from the insertion opening 2 on the joint body 3 side with an annular groove formed on the inner peripheral surface of the ring-shaped tightening restricting tool 8. It is preferable that it is held immovable in the axial direction.

Interengaging portions 8A and 7A are formed on the axially opposed surfaces of the ring-shaped tightening restricting member 8 and the tightening member 7. I have. Mutually engaging portions 8A, 7A formed of these serrated protrusions
Indicates that the rotation starts from the position where the two members 8A and 7A come into contact with the screwing of the tightening member 7 and that the upper limit of the proper tightening range is reached, and that the tightening member 7 further advances the tightening. In the position, the ring-shaped tightening regulating tool 8 is configured to exhibit a movement stopper function, restrict further screwing movement of the tightening member 7, and maintain the lower limit of the appropriate tightening range.

Next, the resin pipe joint A having the above structure
An operation procedure for connecting and connecting the resin pipe 1 and the joint main body 3 using the above will be described. 1 and 2 show a state before the tightening member 7 is tightened. When the tightening member 7 is screwed in from this state, as shown in FIG. And the tip of the mutual engagement portion 8A on the side of the ring-shaped tightening restricting tool 8 comes into contact, and when screwed in from this position, the two 7 and 8 start to rotate together to reach the state shown in FIG. This state indicates that it is at the upper limit of the proper tightening range, and this can be easily determined by visual inspection.

Further, when the fastening member 7 is screwed in,
FIG. 5 in which the mutual engaging portions 7A and 8A are completely engaged with each other.
In this state, the ring-shaped tightening restricting tool 8 functions as a movement stopper, indicating that further screwing movement of the tightening member 7 has been restricted and the lower limit of the proper tightening range has been reached. Performs proper tightening management with good workability without using any jigs and tools, and prevents damage to the joint body 3 due to excessive tightening, and a function to prevent a predetermined slip-out and ensure sealing performance. Is obtained in such a manner that the connection state is reliably exhibited.

FIGS. 6 and 7 are partial longitudinal sectional side views of a resin pipe joint according to a second embodiment of the present invention. The basic structure of the resin-made pipe joint A according to the second embodiment is the same as that of the resin-made pipe joint A according to the above-described first embodiment. Only parts different from the first embodiment will be described in detail below.

That is, the reference surface 4 formed at the base of the insertion port 2 of the joint body 3 and the cap nut-shaped fastening member 7
As shown in FIGS. 8 and 9, a ring-shaped tightening restricting tool 8 interposed between them is formed in a shape having a notch 8b at one location in the circumferential direction. A ring-shaped tightening restricting tool 8 is fitted and held outside the insertion port 2 on the joint body 3 side.

On the axially opposed surfaces of the ring-shaped tightening restricting member 8 and the tightening member 7, there are formed conical expanding force generating portions 8B and 7B along the axial direction, respectively. . The conical surface expanding force generating portions 8B and 7B are formed with conical surfaces 8c and 7c having the same inclination angle with respect to the axis C or a slightly larger inclination angle on the side of the tightening member 7 with respect to the axis C. It comprises annular vertical surfaces 8d and 7d formed vertically.

In the resin-made pipe joint A of the second embodiment having such a configuration, the screwing of the fastening member 7
As shown in FIG. 6, the conical surfaces 8c, 7c of both 8B, 7B
In or to each other reaches the initial position in contact with each other exhibits that a proper clamping range kept closed position as in FIG. 8 the lacking part 8b of the ring-shaped tightening restricting mechanism 8, which visually or fumbling It is possible to easily judge by feeling.

Further, as the tightening by the tightening member 7 proceeds, the conical surfaces 8c, 7c of the two 8B, 7B move relative to each other in the axial direction by a fixed amount while being in contact with each other, as shown in FIG. At a position where the annular vertical surfaces 8d, 7d of the two 8B, 7B are in contact with each other, a certain or more expanding force acts on the ring-shaped tightening restricting tool 8 by the expanding force generating portions 8B, 7B, so that the ring-shaped tightening is performed. The notch 8b of the restricting tool 8 is changed to the open position as shown in FIG. 9, and in this state, the ring-shaped tightening restricting tool 8 functions as a movement stopper, and Since the change in posture can be easily determined visually or by groping, stopping further tightening by the tightening member 7 can prevent damage to the joint body 3 due to excessive tightening. Can,
As in the case of the first embodiment, the proper tightening management is performed with good workability without using a dedicated jig or tool, and the predetermined slip-out preventing function and the function for ensuring the sealing property are surely exhibited. A connection state as shown in FIG.

[0023]

As described above, claims 1 and 3 are as described above.
According to the invention described in the above, visual judgment by the operator can be performed by simply performing a simple operation of screwing in the tightening member without using a dedicated jig or tool such as a torque wrench or a gap gauge. Appropriate tightening management can be easily carried out with the feeling of groping. In addition, there is an effect that a connection state in which the joint body is reliably prevented from being damaged due to excessive tightening, and a predetermined slip-out preventing function and a function for ensuring sealing performance can be reliably obtained.

[0024] Particularly, in the invention described in claim 1,
As interengaging portions to be formed on the opposite surface of the axial ring-shaped tightening restricting mechanism and the clamping member, because it is formed from the rotational circumferential sawtooth projections along the height thereof serrations By appropriately setting the (projection amount) and the thickness in the axial direction of the ring-shaped tightening restricting tool, the proper tightening range and tightening limit can be arbitrarily set, and various sizes and sizes of resin can be used. It can be effectively applied to pipe fittings.

[0025] In the first aspect of the present invention, the ring-shaped tightening restricting tool is not only rotatably fitted to the outside of the insertion opening of the joint body, but is also axially moved by engaging means or the like. When adopting a configuration that allows the ring-shaped tightening restricting tool to not move in the axial direction, keep the contact state with the reference surface formed at the base of the insertion opening of the joint body, for example, It is possible to prevent a change in the proper tightening range due to the intrusion of foreign matter between the two, and to always perform appropriate proper tightening management properly.

[Brief description of the drawings]

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

FIG. 2 is a partial vertical sectional side view of the resin pipe joint according to the first embodiment.

FIG. 3 is an external side view illustrating a first operation state during connection construction of the resin pipe joint according to the first embodiment.

FIG. 4 is an external side view for explaining a second operation state during connection construction of the resin pipe joint according to the first embodiment.

FIG. 5 is an external side view illustrating a third operation state during connection construction of the resin pipe joint according to the first embodiment.

FIG. 6 is a partial vertical sectional side view for explaining a first operation state during connection construction of a resin pipe joint according to a second embodiment of the present invention.

FIG. 7 is a partial vertical sectional side view for explaining a second operation state at the time of connection construction of the resin pipe joint according to the second embodiment.

FIG. 8 is a front view of the ring-shaped tightening restricting tool in the first operation state at the time of connection construction of the resin pipe joint according to the second embodiment.

FIG. 9 is a front view of the ring-shaped tightening restricting tool in a second operation state during connection construction of the resin pipe joint according to the second embodiment.

[Description of Signs] 1 Resin pipe 2 Insertion port 3 Joint body 4 Reference surface 5 Male thread 6 Female thread 7 Tightening member 8 Ring-shaped tightening restricting tool 7A, 8A Interengagement section 7B, 8B Part 8b Missing part

Continuation of the front page (56) References JP-A-10-332070 (JP, A) JP-A-11-94178 (JP, A) JP-A-7-248087 (JP, A) JP-A-9-264470 (JP) , A) Patent 2917134 (JP, B1) Patent 2961532 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 33/00-33/23 F16L 19/00-19/08 F16L 47/04-47/06 F16L 21/00-21/08

Claims (3)

(57) [Claims] 1. A joint body having an insertion port into which an end of a resin pipe can be inserted and connected. A reference surface formed perpendicular to an axis at a base of the insertion port and the joint body. A resin-made pipe joint in which a ring-shaped tightening restricting tool is interposed between a male member formed on the outer peripheral surface of the insertion port and a female member having a female screw portion that can be screwed into the male screw portion. The tightening member in the shape of a ring is rotatably fitted and held on the outside of the insertion port on the joint body side, and the surface in the axial direction of the ring-shaped tightening member and the tightening member, Formed from serrated protrusions along the circumferential direction of rotation
In accordance with the screwing of the tightening member, the joint starts to rotate from the position where they come into contact with each other, indicating that the tightening member is in the proper tightening range, and the ring-shaped tightening restrictor is tightened at the position where the tightening has further progressed. A resin-made pipe joint, wherein an interengaging portion is formed so as to restrict the screwing movement of the attached member. 2. The resin pipe according to claim 1, wherein the ring-shaped tightening restrictor is fitted and held so as to be immovable in the axial direction and rotatable only outside the insertion opening on the joint body side. Fittings. 3. A reference surface formed perpendicular to an axis at a base of the insertion port on a joint body side having an insertion port into which an end of a resin pipe can be inserted and connected, and the joint body side. A resin-made pipe joint in which a ring-shaped tightening restricting tool is interposed between a male member formed on the outer peripheral surface of the insertion port and a female member having a female screw portion that can be screwed into the male screw portion. The annular tightening restrictor has a notch at one location in the circumferential direction and is fitted and held outside the insertion port on the joint body side. On the opposite surface in the axial direction with the attaching member, at the initial position where the two come into contact with the fastening member with the screwing of the fastening member, the notched portion is kept in the closed posture and it is in the appropriate tightening range, and further tightening is performed. Proceed and maintain a constant amount in the axial direction with each other while maintaining contact Resin pipe fitting in position against movement, characterized in that the diameter force generating unit that applies a diameter force that changes the posture open the lack portion restricting mechanism with a ring-shaped fastening is formed.