JPH11230463A - Pipe joint made of resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To evenly and reliably determine proper sealing ability in a pipe connection spot and a proper screwing amount of a fastening member, required for prevention of a slip-out of a pipe, and to regulate the additional fastening limit of the fastening member, in the fastening regulation tool of the fastening member to be screwed in a spigot part on the joint side where pipes are interconnected and fasten a pipe. SOLUTION: An end face of a joint body 1 forms a reference surface 13, and a gap (b) between a first abutment part 16 of the tip of a protrusion piece 15 arranged at the joint body 1 and the reference surface 13 is adjusted to a value equal to a distance (a) (a reference distance) between the reference surface 13, available when a screwing amount of the fastening member 2 in the spigot part 11 attains a proper amount, and an opposite part 22. The protrusion piece 15 is formed of a thin piece sounding during flipping. A value available when the opposite part 22 is brought into abutment against the reference surface 13 is set as an additional fastening limit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connected to an insertion port of a joint, which is screwed into the insertion port of the joint, to secure a sealing property or to remove the pipe. The present invention relates to a resin-made pipe joint which is prevented from being damaged.

[0002]

2. Description of the Related Art A piping for supplying a fluid used in a semiconductor manufacturing process is required to have a certain characteristic in consideration of a special use environment in which chemical resistance and corrosion resistance are required. Pipes made of synthetic resin made of resin are used, and joints (e.g., valves and fluid equipment connected to the pipes) interposed at many connection points and many branch points of the pipe. Similarly, a synthetic resin having certain characteristics is used for the material (including a joint integrally provided with the joint). And, in the connection structure between the joint and the pipe, accidental withdrawal of the pipe connected to the insertion port is prevented by a tightening force of a tightening member such as a pressing ring screwed into the insertion port on the joint side. At the same time, a structure that ensures the sealing property of the connection portion is often adopted. In this connection structure, the function of preventing accidental withdrawal of the pipe due to the tightening of the tightening member and the performance of ensuring the sealability of the pipe connection location are based on the surface pressure generated due to the tightening of the tightening member. It is only shown when it comes to surface pressure.

[0003] In the case of adopting the above connection structure, as means for determining the tightening force of the tightening member to an appropriate size in order to prevent the pipe from being pulled out and to ensure good sealing performance,
Conventionally, a method of screwing the tightening member using a torque wrench, a method of rotating the tightening member a predetermined number of times when screwing the tightening member into the insertion port portion, and the like have been performed.

[0004]

However, the method of using a torque wrench and the method of rotating the fastening member a predetermined number of times have been troublesome and require skill.

[0005] Further, when it is necessary to check whether the tightening member has been forgotten to be tightened or whether the tightening state of the tightening member is good or not, a troublesome check operation must be performed using a tool or a jig. It was difficult to eliminate any accidents caused by the accident.

The present invention has been made in view of the above circumstances, and an appropriate screwing amount of a tightening member capable of obtaining the above-mentioned reference surface pressure can be obtained without using a conventional cumbersome and skillful method. It is an object of the present invention to provide a resin-made pipe joint that can be reliably determined without variation, and that can easily and promptly confirm whether a tightening member has been forgotten to be tightened or a tightening state of the tightening member is good.

[0007]

According to a first aspect of the present invention, there is provided a resin pipe joint comprising a joint body having an insertion port, and a pipe screwed into the insertion port and inserted into the insertion port. A resin pipe joint comprising a tightening member to be tightened, and a reference plane perpendicular to an axis of the tightening member screwed into the joint body or the insertion port of the joint body, and a reference surface of the reference plane. A tightening control mechanism including a projection protruding forward and having a tip formed as a first contact portion;
When the fastening member is screwed into the insertion opening, an opposing portion that comes into contact with the first contact portion is separately provided for the joint body and the fastening member, and is provided in the axial direction. The distance between the reference surface and the first contact portion is equal to the distance between the reference surface and the facing portion when the amount of screwing of the fastening member into the insertion port becomes an appropriate amount. It has become.

The operation of the resin pipe joint having the above-described structure in which the tightening regulating mechanism is provided on the joint body and the opposing portion is provided on the tightening member will be described. When the opposing portion is brought into contact with the first contact portion at the tip of the protruding piece by screwing the fastening member into the insertion port portion of the joint body, the interval between the reference surface and the opposing portion becomes equal to the reference surface, the first contact portion. Is determined to be equal to the interval. The distance between the reference surface and the first contact portion is equal to the distance between the reference surface and the facing portion when the amount of screwing of the fastening member into the insertion port of the joint body becomes an appropriate amount. Therefore, the screwing amount of the tightening member is determined to be an appropriate amount without variation and the above-mentioned reference surface pressure can be obtained only by performing the above-described tightening operation.

Further, when the screwing amount of the fastening member has not reached the proper amount, a gap is still formed between the facing portion of the fastening member and the first contact portion at the tip of the protruding piece. Therefore, when the gap can be visually confirmed, it can be immediately recognized that the tightening member has not been tightened. When the gap cannot be confirmed, it is said that the tightening member has been tightened by an appropriate amount. You can recognize it immediately.

According to a second aspect of the present invention, there is provided a resin pipe joint according to the first aspect, wherein a base of the projecting piece is connected to a bottom surface of a recessed portion recessed behind the reference surface. At the same time, the reference surface is also used as a second contact portion that abuts the facing portion and regulates a tightening limit of the fastening member.

[0011] In the resin pipe joint of this configuration, the fastening member is screwed into the insertion port, and the first end of the protruding piece is screwed.
When the opposing portion of the fastening member comes into contact with the contact portion, the screwing amount of the fastening member becomes an appropriate amount, and the above-described reference surface pressure can be obtained. When the tightening member is screwed in an appropriate amount in this way and the tightening member is further tightened to retighten, the protruding piece is pushed down by the tightening member and retracted into the recessed portion. Accordingly, the facing portion of the joint body comes into contact with the second contact portion which is also used by the reference surface of the joint body. When the facing portion of the tightening member abuts on the reference surface of the joint body in this manner, the tightening member can no longer be tightened, and a proper tightening allowance for additional tightening is secured.

According to a third aspect of the present invention, there is provided a resin pipe joint according to the first aspect, wherein a base of the projecting piece is connected to the reference surface, and the projecting piece is formed of the fastening member. The outer surface of the protruding piece when pushed down by the above and overlaps with the reference surface is formed as a second contact portion that restricts the tightening limit of the tightening member by contacting the opposing portion. It is.

[0013] In the resin pipe joint of this configuration, the fastening member is screwed into the insertion port, and the first end of the protruding piece is inserted.
When the opposing portion of the fastening member comes into contact with the contact portion, the screwing amount of the fastening member becomes an appropriate amount, and the above-described reference surface pressure can be obtained. When the tightening member is screwed in an appropriate amount in this way and then further tightened by further tightening the tightening member, the protruding piece is pushed down by the tightening member and overlaps the reference surface. When the protruding piece is pushed down and overlaps the reference surface in this way, the facing portion of the joint body comes into contact with the second contact portion formed by the outer surface of the pushed-down protruding piece.
When the facing portion of the fastening member abuts on the second contact portion of the protruding piece, the fastening member can no longer be fastened, and an appropriate tightening allowance for retightening is secured.

[0014] The facing portion may be formed by a projection as in the invention according to claim 4, or may be recessed at a plurality of circumferential positions of the joint body or the fastening member as in the invention according to claim 5. Can be formed by walls formed between the recesses. In the case where the facing portion is formed by the above-described projection or wall portion, when the projecting piece is kicked by the facing portion, the sound is rejected by the facing portion as in the invention according to claim 6. It is desirable to adopt a configuration in which it is made of a flake that emits.

With this configuration, the operator can recognize that the fastening member is screwed in an appropriate amount by checking the sound emitted from the projecting piece.

Although the above description of the invention according to claims 1 to 6 is directed to the case where the tightening regulating mechanism is provided on the joint body and the opposing portion is provided on the tightening member, respectively, Regarding the invention according to claim 1 to claim 6, the tightening control mechanism is on the tightening member, the facing portion is on the joint body,
Even if each is provided, a similar effect is exerted.

According to a seventh aspect of the present invention, there is provided a resin pipe joint comprising: a joint body having an insertion port; and a tightening member screwed into the insertion port and tightening a pipe inserted into the insertion port. A resin-made pipe fitting provided with an end face perpendicular to the axis of the insertion port portion formed outside the base of the insertion port portion in the joint main body, and the end face is a reference surface, A protrusion provided on the joint body and extending in the axial direction of the insertion port portion is projected forward of the reference surface, and a tip of the protrusion has a facing portion facing the reference surface. A first contact portion which comes into contact with an opposing portion when the fastening member is screwed into the insertion port portion, wherein a distance between the reference surface and the first contact portion in the axial direction is such that the insertion The amount of screwing of the tightening member into the mouth is appropriate. Rutoki of which is equal spacing and distance between the reference surface and the facing part, is that.
The resin-made pipe joint of this configuration exerts the same operation as the above-mentioned resin-made pipe joint in which the tightening control mechanism is provided on the joint body and the facing portion is provided on the tightening member.

According to an eighth aspect of the present invention, in the resin pipe joint according to the seventh aspect, the tightening member has a plurality of concave portions and convex portions extending in the axial direction alternately provided on an outer periphery thereof. At the same time, the facing portion is formed by the convex portion. In the present invention, the plurality of concave portions and convex portions provided on the outer periphery of the tightening member can have an essential function of exhibiting a non-slip action when tightening the tightening member. Therefore, the plurality of convex portions as slip stoppers can be used as the facing portions, and it is not necessary to form the facing portions specially on the fastening member.

According to a ninth aspect of the present invention, there is provided a resin pipe joint comprising: a joint body having an insertion port; and a tightening member which is screwed into the insertion port and tightens a pipe inserted into the insertion port. A resin pipe fitting provided with the fastening member, wherein a front end face perpendicular to an axis thereof is provided as a reference surface, and is provided on the fastening member and extends in an axial direction. When the protruding piece is projected forward of the reference surface, and the tip of the protruding piece is screwed into the insertion portion of the joint body having a facing portion facing the reference surface. A first contact portion abutting on the opposite portion is provided, and an interval between the reference surface and the first contact portion in the axial direction is set so that an amount of screwing of the fastening member into the insertion port is an appropriate amount. At the same time as the distance between the reference plane and the facing part. And have, is that. The resin-made pipe joint of this configuration exerts the same action as the above-mentioned resin-made pipe joint in which the tightening regulating mechanism is provided on the tightening member and the facing portion is provided on the joint body.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a resin pipe joint according to the present invention will be described with reference to FIGS. 3, 4 and 5 show the internal structure of the joint body 1 and the fastening member 2 in cross section. In this resin pipe joint A, the joint body 1
Has a function to connect pipes,
It also includes such things as connection parts provided in the equipment itself such as piping accessories and fluid equipment interposed at appropriate places in the piping such as valves.

The joint body 1 is provided with an insertion port 11 to which a pipe 200 is connected. A female thread 21 of a tightening member 2 formed by a pressing ring is screwed into a male thread 12 of the insertion port 11. When tightened, the outlet 11
The pipe 200 inserted in advance is tightened,
It has the function of ensuring the sealing performance of the connection between the insertion port 11 and the pipe 200 and, at the same time, preventing the pipe 200 from being pulled out. An appropriate screwing amount of the tightening member 2 when such a function is satisfactorily exhibited is fixed, and if the screwing amount of the tightening member 2 is an appropriate amount, the tightening member 2 The surface pressure generated by the tightening becomes the reference surface pressure, so that the above-mentioned function is favorably exhibited. The joint body 1 has an end face perpendicular to the axis outside the base of the insertion port 11, and the end face is used as a reference plane 13. As shown in FIG. 1 when the joint body 1 is viewed from the front (front side), the reference surface 13 is provided with a recessed portion 14 that is recessed behind the reference surface 13 at predetermined positions in the circumferential direction (in the illustrated example, at equal angles). 4), and a base 15a (see FIG. 4) of the protruding piece 15 is continuously provided at the center of the bottom surface of the recessed portion 14. This protruding piece 15 is inserted into the insertion port 11.
And protrudes forward of the reference surface 13, and the tip of the protruding piece 15 is formed as a first contact portion 16.

When the tightening member 2 is screwed into the insertion opening 11 of the joint body 1 by an amount capable of satisfactorily exhibiting the above function, the predetermined portion of the tightening member 2 is fixed with respect to the reference surface 13. (Hereinafter referred to as “reference interval”). Here, the predetermined portion facing the reference surface 13 is referred to as a facing portion 22. As shown in FIGS. 2 and 3 to 5 when the fastening member 2 is viewed from the front (front surface), in the illustrated fastening member 2, the facing portions 22 project from a plurality of locations on the end surface of the fastening member 2. It is formed by the tip of the formed flat projection 23.

The projecting piece 15 provided on the joint body 1
Is a thin piece having a thickness of 0.5 to 1.5 mm. Therefore, the projecting piece 15 has elasticity, and has a property of emitting sound when flipped. Then, the reference surface 13 and the projection 1
The distance b between the tip of the first end 5 and the first contact portion 16 is
When the screwing amount of the tightening member 2 into the screw member 1 becomes an appropriate amount, the distance between the reference surface 13 and the facing portion 22 described above, that is, FIG.
Is equivalent to the reference interval a shown in FIG.
b).

In this resin pipe joint A, the fastening member 2
In order to properly adjust the screwing amount of the screw, the tightening member 2 previously fitted to the pipe 200 is screwed into the insertion opening 11 of the joint body 1 as shown in FIG. Screw it in. The pipe 200 is inserted in the insertion port 11 in advance.

In this way, as shown in FIG. 4, when the facing portion 22 of the fastening member 2 hits the first contact portion 16 of the projecting piece 15 on the joint body 1, the reference surface 13 and the facing portion 22 Is the reference surface 13 and the first contact portion 16 at the tip of the protruding piece 15.
Is determined to be equal to the interval b. Therefore, the distance between the reference surface 13 and the facing portion 22 is determined to be the above-described reference distance a, and the screwing amount of the fastening member 2 becomes an appropriate amount. When the fastening member 2 is screwed in an appropriate amount, the insertion port 11
The sealability at the connection point between the pipe 200 and the pipe 200 is sufficiently secured, and at the same time, the pipe 200 is prevented from being pulled out.

As described with reference to FIG. 4, after the tightening member 2 is screwed in by an appropriate amount, the tightening member 2 is further screwed in. When the opposing portion 22 rotates with the screwing, the opposing portion 22 is rotated. The projection 23 forming the projection 15
Kick. Therefore, the projecting piece 15 is repelled by the projection 23 and emits a sound. Therefore, the worker can hear this sound to confirm that the fastening member 2 has already been screwed in an appropriate amount.

In this embodiment, the confronting portion 22 of the fastening member 2 is formed by a projection 23 protruding from an end face of the fastening member 2.
Is formed by the tip of the protruding piece 1
5 is reliably performed, and the reliability of confirming with the sound of the protruding piece 15 that the fastening member 2 has been screwed in by an appropriate amount is greatly increased.

In this resin pipe joint A, not only can the tightening member 2 be further tightened from the adjusted position in FIG. 4 but also the tightening limit at that time is accurately regulated. Become.

That is, when the tightening member 2 screwed by an appropriate amount as described with reference to FIG. 4 is further screwed, the opposing portion 22 is brought into contact with the opposing portion 22 by the rotation of the opposing portion 22 accompanying the screwing. As shown in FIG. 5, the protruding piece 15 is pushed down in the rotation direction of the facing portion 22 and retracts into the recessed portion 14, whereby the facing portion 22 comes into contact with the reference surface 13. When the facing portion 22 comes into contact with the reference surface 13 in this manner,
The tightening member 2 can no longer be tightened, thereby regulating the proper tightening allowance for retightening. Therefore, the reference surface 13 is also used as a second contact portion 24 (see FIGS. 1 and 5) in which the facing portion 22 is abutted and regulates the tightening limit of the fastening member 2. The above-mentioned closing margin can be defined as a management width at the time of additional tightening. By providing a concave portion at the base of the projecting piece 15, the projecting piece 15
2 may make it easy to be pushed down.

In the connection structure shown in FIGS. 3 to 5, the inner cylinder (inner ring) 3 into which the end of the pipe 200 is inserted is fitted into the insertion port 11 so that the inner cylinder 3 and the insertion port 11 are connected to each other. The pipe 200 and the inner cylinder 3 are pressed inward in the axial direction by the pressing portion 25 of the tightening member 2 screwed into the male screw portion 12 of the insertion port 11 by sandwiching the end of the pipe 200. 11 and pipe 2
00 and at the same time, the pipe 2
00 is prevented from being extracted.

The joint body 1 and the fastening member 2 are made of a synthetic resin having excellent properties such as chemical resistance and heat resistance, for example,
In addition to polyethylene resin, polypropylene resin, polyvinyl chloride resin, PFA (perfluoroalkoxy resin), PTFE (ethylene tetrafluoride), ETFE (ethylene-tetrafluoroethylene resin), CTFE (chlorotrifluoroethylene resin), ECTFE Fluoro resins such as (ethylene-chlorotrifluoroethylene resin) can be suitably used.

In the resin pipe joint A described with reference to FIGS. 1 to 5, the reference surface 13 provided on the joint body 1 and the projecting piece 15 having the tip formed as the first contact portion 16 are tightened. A tightening regulation mechanism for properly maintaining the screwing amount of the member 2 is formed. Therefore, in the resin pipe joint A described with reference to FIGS. 1 to 5, the tightening control mechanism is provided in the joint body 1,
Although the confronting portion 22 is of the type provided on the fastening member 2, it is also possible to provide a tightening control mechanism on the tightening member 2 and to provide the confronting portion on the joint body 1. is there. An embodiment of this type is shown in FIG.

The resin pipe joint A shown in FIG.
1 and a fastening member 2 that is screwed into the insertion port 11 and tightens the pipe 200 inserted into the insertion port 11. A front end face perpendicular to the axis of the fastening member 2 is used as a reference surface 13 ′, and a projection 15 ′ provided on the fastening member 2 and extending in the axial direction is provided. The projection 15 ′ is projected forward of the reference surface 13 ′, and a first contact portion 16 ′ is provided at the tip of the projection 15 ′. When the fastening member 2 is screwed into the insertion opening 11 of the joint body 1 having the facing portion 22 ′ facing the reference surface 13 ′, the first contact portion 16 ′ faces the facing portion 2 ′.
This is the part that contacts 2 '. The distance b between the reference surface 13 ′ and the first contact portion 16 ′ in the axial direction is equal to the insertion port 1.
The distance (reference distance) a between the reference surface 13 ′ and the facing part 22 ′ when the screwing amount of the fastening member 2 into the screw member 1 is an appropriate amount is equal to the distance a. Note that the protruding piece 15 ′ is
The reference surface 13 ′ is abutted against the confronting portion 22 ′ to restrict the tightening limit of the tightening member 2. 2 contact part 2
Also used for 4 '. Further, the facing portion 22 ′
It is formed outside the base of the insertion opening 11 of the joint main body 1 by a projection 23 'on the end face formed perpendicular to the axis thereof.

The same effect as that described with reference to FIGS. 1 to 5 is also exerted in the resin pipe joint A. That is,
As shown in FIG. 11, when the facing portion 22 'hits the first contact portion 16' of the projecting piece 15 ', the reference surface 13' and the facing portion 22 '.
Is the distance b between the reference surface 13 'and the first contact portion 16'.
Is determined to be equal to the reference interval a, and the screwing amount of the fastening member 2 becomes an appropriate amount. Then, after the fastening member 2 is screwed in by an appropriate amount, when the fastening member 2 is further screwed in, the protruding piece 15 ′ is repelled by the projection 23 ′ and emits a sound. It is confirmed that the screw has been screwed in the amount. When the tightening member 2 is further tightened from the adjusted position shown in FIG. 11, the protruding piece 15 ′ is pushed down and retracted into the concave portion 14 ′, and the facing portion 22 ′ is moved to the reference surface 1.
An appropriate tightening allowance for additional tightening is regulated by contacting 3 '. Therefore, the reference surface 13 ′ is provided with the second contact portion 2, which is in contact with the facing portion 22 ′ and regulates the tightening limit of the fastening member 2.
Also used for 4 '.

In a resin pipe joint of a type in which a tightening regulating mechanism is provided on the joint body 1 and an opposing portion 22 is provided on the tightening member 2, as shown in FIGS. 6 and 7 showing another embodiment. By providing recesses 26 at a plurality of locations in the circumferential direction of the fastening member 2 as the facing portions 22, the recesses 26 are provided.
It is also possible to use the walls formed between. The structure of the joint main body 1 shown in FIG. 6 is the same as that described with reference to FIGS. 1 and 3 to 5, and therefore, the same portions are denoted by the same reference numerals and detailed description thereof will be omitted.

The resin pipe joint A shown in FIG.
The same operation as that described with reference to FIGS. That is, when the fastening member 2 is screwed into the insertion port portion 11, and the facing portion 22 hits the first contact portion 16 of the projecting piece 15,
The interval between the reference surface 13 and the facing portion 22 is determined to be equal to the interval b between the reference surface 13 and the first contact portion 16 and becomes a reference interval.
The screwing amount of the fastening member 2 becomes an appropriate amount. When the fastening member 2 is screwed in by an appropriate amount and then further tightened, the protruding piece 15 is repelled by the facing portion 22 and emits a sound. It is confirmed that only screwed. When the tightening member 2 is further tightened from the adjusted position, the protruding piece 15 is pushed down and retracted into the concave portion 14, and the facing portion 22 is moved to the reference surface 1.
3, the appropriate tightening allowance for additional tightening is regulated. Therefore, the reference surface 13 is also used as the second contact portion 24 that restricts the tightening limit of the fastening member 2 when the facing portion 22 is in contact with the reference surface 22.

8 to 10 show still another embodiment. In the resin-made pipe joint according to this embodiment, a tightening control mechanism is provided on the joint body 1, and the facing portion 22 is formed of the tightening member 2.
It is a type provided in. The fastening member 2 is provided with a plurality of concave portions 27 and convex portions 28 which are long in the axial direction on the outer periphery thereof. The concave portion 27 and the convex portion 28 are originally provided to exert a non-slip function when the fastening member 2 is tightened with a hand or a tool, but in this embodiment, Of the concave portion 27 and the convex portion 28 exhibiting such an anti-slip function, the convex portion 28 is
It can be used as 2. That is, the insertion port 1 is located outside the root of the insertion port 11 of the joint body 1.
An end face perpendicular to one axis is formed, and the end face is used as a reference plane 13. A protruding piece 15 provided on the joint body 1 and extending in the axial direction of the insertion port 11 protrudes forward of the reference surface 13 and, as shown in FIGS. It is provided at a position facing the end face and the concave portion 27. A first contact portion 16 is provided at the tip of the projecting piece 15, and the first contact portion 16 is provided with the fastening member 2 having the facing portion 22 facing the reference surface 13.
When the screw 1 is screwed into the bracket 1, it comes into contact with the facing portion 22. Further, the distance “b” between the reference surface 13 and the first contact portion 16 in the axial direction is determined by adjusting the fastening member 2 to the insertion port 11.
Is equal to the distance (reference distance) a between the reference surface 13 and the facing portion 22 when the screwing amount of the screw becomes an appropriate amount. The base 15a of the protruding piece 15 is connected to the reference surface 13, and when the protruding piece 15 is pushed down by the fastening member 2 and overlaps the reference surface 13, as shown in FIG. The outer surface of the piece 15 is formed as a second contact portion 15b with which the facing portion 22 abuts to regulate the tightening limit of the fastening member 2.

In this resin pipe joint A, the fastening member 2
When adjusting the screwing amount of the pipe properly,
Then, the tightening member 2 fitted into the fitting 00 is screwed into the insertion opening 11 of the joint body 1. The pipe 200 is inserted in the insertion port 110 in advance. In this manner, as shown in FIG. 8, the facing portion 22 of the fastening member 2 is
When the first contact portion 16 of the tip of
The distance between the first contact portion 16 and the reference surface 13 is determined to be equal to the distance between the reference surface 13 and the first contact portion 16. Therefore, the distance between the reference surface 13 and the facing portion 22 is determined as the reference distance a, and the screwing amount of the fastening member 2 becomes an appropriate amount. When the fastening member 2 is screwed in an appropriate amount, the insertion port 11 and the pipe 2
Good sealing performance at the connection point with the pipe 200 is ensured, and at the same time, the pipe 200 is prevented from being pulled out.

After the tightening member 2 is screwed in an appropriate amount as shown in FIG. 8, the tightening member 2 is further screwed in.
Due to the rotation of the facing portion 22 caused by the screwing, the facing portion 22 kicks the projecting piece 15. Therefore, the projecting piece 15 is repelled by the facing portion 22 to emit a sound. Therefore, the worker can hear this sound to confirm that the fastening member 2 has already been screwed in an appropriate amount.

After the tightening member 2 is screwed in by an appropriate amount, the tightening member 2 is further screwed in and further tightened. As shown in FIG.
2 and overlaps with the reference plane 13.
The protruding piece 15 pushed down in this way is
The second surface which is the outer surface of the protruding piece 15 when
The confronting portion 22 abuts against the contact portion 15b to restrict the tightening limit of the tightening member 2, and the tightening member 2 cannot be screwed any further.

Here, in the embodiments described with reference to FIGS. 1 to 5, 6 and 7, the base 15a of the protruding piece 15 may be provided continuously with the reference surface 13, as described with reference to FIG. In the embodiment, the base 15a ′ of the protruding piece 15 is
It may be connected to 3 '. In these cases, the concave portions 14, 14 'become unnecessary. In the embodiments described with reference to FIGS. 8 to 10, the joint body 1 is provided with a recessed portion which is recessed behind the reference surface 13, and the protrusion 1 is provided on the bottom surface of the recessed portion.
5 may be connected continuously.

The resin pipe joint according to the present invention is basically
The above-described tightening control mechanism and the facing portion that comes into contact with the first contact portion when the tightening member is screwed into the insertion port portion are separately provided for the joint body and the tightening member. The distance between the reference surface and the first contact portion in the axial direction is equal to the distance between the reference surface and the facing portion when the amount of screwing of the fastening member into the insertion port becomes an appropriate amount. It is sufficient if the interval is When this configuration is adopted, the base of the protruding piece is provided continuously with the bottom surface of the recessed portion recessed behind the reference surface, and the reference surface is brought into contact with the facing portion and It may be used also as a second contact portion that regulates the tightening limit of the tightening member, or the base of the protruding piece is connected to the reference surface, and the protruding piece is pushed down by the tightening member. The outer surface of the protruding piece when overlapping with the reference surface may be formed as a second contact portion that restricts the tightening limit of the tightening member by contacting the facing portion. Further, even if the facing portion is formed by a projection, it is formed by a wall portion formed between the recesses by providing a plurality of recesses in the circumferential direction of the joint body or the fastening member. You may.

[0043]

According to the resin pipe joint of the present invention, the appropriate screwing amount of the tightening member for obtaining the reference surface pressure can be reliably determined without any variation without using a complicated and skillful method as in the prior art. Will be able to do it. In particular, when the tightening member is screwed in an appropriate amount, the elastic piece is repelled and emits a sound, so when working in a narrow space where only hands can be inserted, or when the vision of elderly people is low. Even when a worker works, there is a convenience that an appropriate screwing amount can be accurately determined. Further, by using the tightening restricting tool according to the present invention, it is possible to easily and quickly confirm whether the tightening member has been forgotten to be tightened or whether the tightening state of the tightening member is good. . Further, the fastening member screwed in by an appropriate amount can be further tightened by an appropriate amount.

[Brief description of the drawings]

FIG. 1 is a front view of a joint main body used for a resin pipe joint according to an embodiment of the present invention.

FIG. 2 is a front view of a fastening member used for the resin pipe joint according to the embodiment of the present invention.

FIG. 3 is a partially broken side view of an initial state in which a fastening member is screwed into an insertion opening of the resin pipe joint according to the embodiment of the present invention.

FIG. 4 is a partially cutaway side view when a screwing amount of a tightening member screwed into an insertion port portion of the resin pipe joint according to the embodiment of the present invention is appropriately adjusted.

FIG. 5 is a partially cutaway side view of the resin pipe joint according to the embodiment of the present invention when a tightening member screwed into an insertion opening is tightened.

FIG. 6 is a partially broken side view of an initial state in which a fastening member is screwed into an insertion opening of a resin-made pipe joint according to another embodiment.

FIG. 7 is a front view of a fastening member used for the resin pipe joint of FIG. 6;

FIG. 8 is a partially broken side view when a screwing amount of a tightening member screwed into an insertion port portion of a resin pipe joint according to still another embodiment is appropriately adjusted.

FIG. 9 is a partially broken side view when a tightening member screwed into an insertion opening of a resin-made pipe joint according to still another embodiment is tightened.

FIG. 10 is a front view of a state in which a fastening member is screwed into an insertion opening of a resin pipe joint according to still another embodiment, as viewed from the direction of arrow X in FIG. 8;

FIG. 11 is a partially broken side view of an embodiment in which a tightening restrictor is provided on a tightening member side and an opposing portion is provided on a joint body side.

[Explanation of symbols]

 A Resin pipe joint 1 Joint body 2 Clamping member 11 Insertion port 13, 13 'Reference surface 14, 14' Depressed portion 15, 15 'Projection 15a, 15a' Projection base 16, 16 'First contact portion 22, 22 'opposing portion 23 protrusion 24, 15b second contact portion 26 concave portion 27 concave portion 28 convex portion 200 pipe a reference interval (distance between reference surface and opposing portion) b interval between reference surface and first contact portion

[Procedure amendment]

[Submission date] February 1, 1999

[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] 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 pipe connected to an insertion port of a joint, which is screwed into the insertion port of the joint, to secure a sealing property or to remove the pipe. The present invention relates to a resin-made pipe joint which is prevented from being damaged.

[0002]

2. Description of the Related Art A piping for supplying a fluid used in a semiconductor manufacturing process is required to have a certain characteristic in consideration of a special use environment in which chemical resistance and corrosion resistance are required. Pipes made of synthetic resin made of resin are used, and joints (e.g., valves and fluid equipment connected to the pipes) interposed at many connection points and many branch points of the pipe. Similarly, a synthetic resin having certain characteristics is used for the material (including a joint integrally provided with the joint). And, in the connection structure between the joint and the pipe, accidental withdrawal of the pipe connected to the insertion port is prevented by a tightening force of a tightening member such as a pressing ring screwed into the insertion port on the joint side. At the same time, a structure that ensures the sealing property of the connection portion is often adopted. In this connection structure, the function of preventing accidental withdrawal of the pipe due to the tightening of the tightening member and the performance of ensuring the sealability of the pipe connection location are based on the surface pressure generated due to the tightening of the tightening member. It is only shown when it comes to surface pressure.

[0003] In the case of adopting the above connection structure, as means for determining the tightening force of the tightening member to an appropriate size in order to prevent the pipe from being pulled out and to ensure good sealing performance,
Conventionally, a method of screwing the tightening member using a torque wrench, a method of rotating the tightening member a predetermined number of times when screwing the tightening member into the insertion port portion, and the like have been performed.

[0004]

However, the method of using a torque wrench and the method of rotating the fastening member a predetermined number of times have been troublesome and require skill.

[0005] Further, when it is necessary to check whether the tightening member has been forgotten to be tightened or whether the tightening state of the tightening member is good or not, a troublesome check operation must be performed using a tool or a jig. It was difficult to eliminate any accidents caused by the accident.

The present invention has been made in view of the above circumstances, and an appropriate screwing amount of a tightening member capable of obtaining the above-mentioned reference surface pressure can be obtained without using a conventional cumbersome and skillful method. It is an object of the present invention to provide a resin-made pipe joint that can be reliably determined without variation, and that can easily and promptly confirm whether a tightening member has been forgotten to be tightened or a tightening state of the tightening member is good.

[0007]

According to a first or second aspect of the present invention, there is provided a resin pipe joint, comprising: a joint body having an insertion port; And a reference surface perpendicular to the axis of the tightening member screwed into the insertion port of the joint body or the joint body. A tightening regulating mechanism having a resilient projection formed so as to protrude forward from the reference surface and having a distal end formed as a first contact portion; and when the tightening member is screwed into the insertion port, Opposing portions abutting on the first contact portion are separately provided for the joint body and the tightening member, respectively, and the reference surface in the axial direction and the first surface are provided separately.
The distance between the contact portion and the contact portion is equal to the distance between the reference surface and the facing portion when the amount of screwing of the fastening member into the insertion opening becomes an appropriate amount.
In the first aspect, the facing portion is a projection.
Is the circumference of the joint body or the fastening member.
By providing a plurality of recesses
And walls formed between the locations.

The operation of the resin pipe joint having the above-described structure in which the tightening regulating mechanism is provided on the joint body and the opposing portion is provided on the tightening member will be described. When the opposing portion is brought into contact with the first contact portion at the tip of the protruding piece by screwing the fastening member into the insertion port portion of the joint body, the interval between the reference surface and the opposing portion becomes equal to the reference surface, the first contact portion. Is determined to be equal to the interval. The distance between the reference surface and the first contact portion is equal to the distance between the reference surface and the facing portion when the amount of screwing of the fastening member into the insertion port of the joint body becomes an appropriate amount. Therefore, the screwing amount of the tightening member is determined to be an appropriate amount without variation and the above-mentioned reference surface pressure can be obtained only by performing the above-described tightening operation.

Further, when the screwing amount of the fastening member has not reached the proper amount, a gap is still formed between the facing portion of the fastening member and the first contact portion at the tip of the protruding piece. Therefore, when the gap can be visually confirmed, it can be immediately recognized that the tightening member has not been tightened. When the gap cannot be confirmed, it is said that the tightening member has been tightened by an appropriate amount. You can recognize it immediately.

According to a third aspect of the present invention, in the resin pipe joint according to the first or second aspect, the base of the projecting piece is connected to the bottom surface of the recessed portion recessed behind the reference surface. In addition, the reference surface is also used as a second contact portion that abuts the facing portion and regulates a tightening limit of the fastening member.

[0011] In the resin pipe joint of this configuration, the fastening member is screwed into the insertion port, and the first end of the protruding piece is screwed.
When the opposing portion of the fastening member comes into contact with the contact portion, the screwing amount of the fastening member becomes an appropriate amount, and the above-described reference surface pressure can be obtained. When the tightening member is screwed in an appropriate amount in this way and the tightening member is further tightened to retighten, the protruding piece is pushed down by the tightening member and retracted into the recessed portion. Accordingly, the facing portion of the joint body comes into contact with the second contact portion which is also used by the reference surface of the joint body. When the facing portion of the tightening member abuts on the reference surface of the joint body in this manner, the tightening member can no longer be tightened, and a proper tightening allowance for additional tightening is secured.

According to a fourth aspect of the present invention, in the resin pipe joint according to the first or second aspect, the base of the projecting piece is connected to the reference surface, and the projecting piece is connected to the reference surface. An outer surface of the protruding piece when pushed down by the tightening member and overlaps the reference surface is formed as a second contact portion for restricting the tightening limit of the tightening member by contacting the facing portion. It is.

[0013] In the resin pipe joint of this configuration, the fastening member is screwed into the insertion port, and the first end of the protruding piece is inserted.
When the opposing portion of the fastening member comes into contact with the contact portion, the screwing amount of the fastening member becomes an appropriate amount, and the above-described reference surface pressure can be obtained. When the tightening member is screwed in an appropriate amount in this way and then further tightened by further tightening the tightening member, the protruding piece is pushed down by the tightening member and overlaps the reference surface. When the protruding piece is pushed down and overlaps the reference surface in this way, the facing portion of the joint body comes into contact with the second contact portion formed by the outer surface of the pushed-down protruding piece.
When the facing portion of the fastening member abuts on the second contact portion of the protruding piece, the fastening member can no longer be fastened, and an appropriate tightening allowance for retightening is secured.

[0014] When the facing portion formed by protrusion or wall as described above, as the invention according to claim 5, said protrusion is repelled by the confronting portions when kicked by the confronting portions It is desirable to adopt a configuration of a thin section that emits sound.

With this configuration, the operator can recognize that the fastening member is screwed in an appropriate amount by checking the sound emitted from the projecting piece.

According to a sixth aspect of the present invention, there is provided a resin pipe joint comprising: a joint main body having an insertion port; and a tightening member screwed into the insertion port and tightening a pipe inserted into the insertion port. A resin-made pipe fitting provided with an end face perpendicular to the axis of the insertion port portion formed outside the base of the insertion port portion in the joint main body, and the end face is a reference surface, A projecting piece having elasticity provided on the joint body and extending in the axial direction of the insertion port portion is projected forward of the reference plane, and a tip of the projecting piece has
A first contact portion that comes into contact with the facing portion when the fastening member having the facing portion facing the reference surface is screwed into the insertion port portion; and the fastening member has an outer periphery.
A plurality of concave portions and convex portions extending in the axial direction are alternately provided.
And the facing portion is formed by the convex portion.
Cage, the distance between the reference surface and the first contact portion in the axial direction, between the reference surface and the facing part when the screwing amount of the fastening member to the receptacle portion is a proper amount It is the same interval as the interval. The resin-made pipe joint of this configuration exerts the same operation as the above-mentioned resin-made pipe joint in which the tightening control mechanism is provided on the joint body and the facing portion is provided on the tightening member.

In the present invention, the plurality of concave portions and convex portions provided on the outer periphery of the tightening member can have an original function of exhibiting a non-slip action when tightening the tightening member. Therefore, the plurality of convex portions as slip stoppers can be used as the facing portions, and it is not necessary to form the facing portions specially on the fastening member.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a resin pipe joint according to the present invention will be described with reference to FIGS. 3, 4 and 5 show the internal structure of the joint body 1 and the fastening member 2 in cross section. In this resin pipe joint A, the joint body 1
Has a function to connect pipes,
It also includes such things as connection parts provided in the equipment itself such as piping accessories and fluid equipment interposed at appropriate places in the piping such as valves.

The joint body 1 is provided with an insertion port 11 to which a pipe 200 is connected. The female screw section 21 of the tightening member 2 formed by a pressing ring is screwed into the male screw section 12 of the insertion port section 11. When tightened, the outlet 11
The pipe 200 inserted in advance is tightened,
It has the function of ensuring the sealing performance of the connection between the insertion port 11 and the pipe 200 and, at the same time, preventing the pipe 200 from being pulled out. An appropriate screwing amount of the tightening member 2 when such a function is satisfactorily exhibited is fixed, and if the screwing amount of the tightening member 2 is an appropriate amount, the tightening member 2 The surface pressure generated by the tightening becomes the reference surface pressure, so that the above-mentioned function is favorably exhibited. The joint body 1 has an end face perpendicular to the axis outside the base of the insertion port 11, and the end face is used as a reference plane 13. As shown in FIG. 1 when the joint body 1 is viewed from the front (front side), the reference surface 13 is provided with a recessed portion 14 that is recessed behind the reference surface 13 at predetermined positions in the circumferential direction (in the illustrated example, at equal angles). 4), and a base 15a (see FIG. 4) of the protruding piece 15 is continuously provided at the center of the bottom surface of the recessed portion 14. This protruding piece 15 is inserted into the insertion port 11.
And protrudes forward of the reference surface 13, and the tip of the protruding piece 15 is formed as a first contact portion 16.

When the tightening member 2 is screwed into the insertion opening 11 of the joint body 1 by an amount capable of satisfactorily exhibiting the above function, a predetermined portion of the tightening member 2 is fixed with respect to the reference surface 13. (Hereinafter referred to as “reference interval”). Here, the predetermined portion facing the reference surface 13 is referred to as a facing portion 22. As shown in FIGS. 2 and 3 to 5 when the fastening member 2 is viewed from the front (front surface), in the illustrated fastening member 2, the facing portions 22 project from a plurality of locations on the end surface of the fastening member 2. It is formed by the tip of the formed flat projection 23.

The projecting piece 15 provided on the joint body 1
Is a thin piece having a thickness of 0.5 to 1.5 mm. Therefore, the projecting piece 15 has elasticity, and has a property of emitting sound when flipped. Then, the reference surface 13 and the projection 1
The distance b between the tip of the first end 5 and the first contact portion 16 is
When the screwing amount of the tightening member 2 into the screw member 1 becomes an appropriate amount, the distance between the reference surface 13 and the facing portion 22 described above, that is, FIG.
Is equivalent to the reference interval a shown in FIG.
b).

In the resin pipe joint A, the fastening member 2
In order to properly adjust the screwing amount of the screw, the tightening member 2 previously fitted to the pipe 200 is screwed into the insertion opening 11 of the joint body 1 as shown in FIG. Screw it in. The pipe 200 is inserted in the insertion port 11 in advance.

In this way, as shown in FIG. 4, when the facing portion 22 of the fastening member 2 hits the first contact portion 16 of the projecting piece 15 on the joint body 1 side, the reference surface 13 and the facing portion 22 Is the reference surface 13 and the first contact portion 16 at the tip of the protruding piece 15.
Is determined to be equal to the interval b. Therefore, the distance between the reference surface 13 and the facing portion 22 is determined to be the above-described reference distance a, and the screwing amount of the fastening member 2 becomes an appropriate amount. When the fastening member 2 is screwed in an appropriate amount, the insertion port 11
The sealability at the connection point between the pipe 200 and the pipe 200 is sufficiently secured, and at the same time, the pipe 200 is prevented from being pulled out.

As described with reference to FIG. 4, after the tightening member 2 is screwed in by an appropriate amount, the tightening member 2 is further screwed in. When the opposing portion 22 rotates with the screwing, the opposing portion 22 is rotated. The projection 23 forming the projection 15
Kick. Therefore, the projecting piece 15 is repelled by the projection 23 and emits a sound. Therefore, the worker can hear this sound to confirm that the fastening member 2 has already been screwed in an appropriate amount.

In this embodiment, the confronting portion 22 of the fastening member 2 is formed by a projection 23 protruding from an end face of the fastening member 2.
Is formed by the tip of the protruding piece 1
5 is reliably performed, and the reliability of confirming with the sound of the protruding piece 15 that the fastening member 2 has been screwed in by an appropriate amount is greatly increased.

In this resin-made pipe joint A, not only can the tightening member 2 be further tightened from the adjusted position in FIG. 4, but also the tightening limit at that time is accurately regulated. Become.

That is, when the tightening member 2 screwed by an appropriate amount as described with reference to FIG. 4 is further screwed, the opposing portion 22 is brought into contact with the opposing portion 22 by the rotation of the opposing portion 22 accompanying the screwing. As shown in FIG. 5, the protruding piece 15 is pushed down in the rotation direction of the facing portion 22 and retracts into the recessed portion 14, whereby the facing portion 22 comes into contact with the reference surface 13. When the facing portion 22 comes into contact with the reference surface 13 in this manner,
The tightening member 2 can no longer be tightened, thereby regulating the proper tightening allowance for retightening. Therefore, the reference surface 13 is also used as a second contact portion 24 (see FIGS. 1 and 5) in which the facing portion 22 is abutted and regulates the tightening limit of the fastening member 2. The above-mentioned closing margin can be defined as a management width at the time of additional tightening. By providing a concave portion at the base of the projecting piece 15, the projecting piece 15
2 may make it easy to be pushed down.

In the connection structure shown in FIGS. 3 to 5, the inner cylinder (inner ring) 3 into which the end of the pipe 200 is inserted is fitted into the insertion port 11 so that the inner cylinder 3 and the insertion port 11 are connected to each other. The pipe 200 and the inner cylinder 3 are pressed inward in the axial direction by the pressing portion 25 of the tightening member 2 screwed into the male screw portion 12 of the insertion port 11 by sandwiching the end of the pipe 200. 11 and pipe 2
00 and at the same time, the pipe 2
00 is prevented from being extracted.

The joint body 1 and the fastening member 2 are made of a synthetic resin having excellent properties such as chemical resistance and heat resistance.
In addition to polyethylene resin, polypropylene resin, polyvinyl chloride resin, PFA (perfluoroalkoxy resin), PTFE (ethylene tetrafluoride), ETFE (ethylene-tetrafluoroethylene resin), CTFE (chlorotrifluoroethylene resin), ECTFE Fluoro resins such as (ethylene-chlorotrifluoroethylene resin) can be suitably used.

In the resin pipe joint A described with reference to FIGS. 1 to 5, the reference surface 13 provided on the joint body 1 and the projecting piece 15 having the tip formed as the first contact portion 16 are tightened. A tightening regulation mechanism for properly maintaining the screwing amount of the member 2 is formed. Therefore, in the resin pipe joint A described with reference to FIGS. 1 to 5, the tightening control mechanism is provided in the joint body 1,
Although the confronting portion 22 is of the type provided on the fastening member 2, it is also possible to provide a tightening control mechanism on the tightening member 2 and to provide the confronting portion on the joint body 1. is there. An embodiment of this type is shown in FIG.

The resin pipe joint A shown in FIG.
1 and a fastening member 2 that is screwed into the insertion port 11 and tightens the pipe 200 inserted into the insertion port 11. A front end face perpendicular to the axis of the fastening member 2 is used as a reference surface 13 ′, and a projection 15 ′ provided on the fastening member 2 and extending in the axial direction is provided. The projection 15 ′ is projected forward of the reference surface 13 ′, and a first contact portion 16 ′ is provided at the tip of the projection 15 ′. When the fastening member 2 is screwed into the insertion opening 11 of the joint body 1 having the facing portion 22 ′ facing the reference surface 13 ′, the first contact portion 16 ′ faces the facing portion 2 ′.
This is the part that contacts 2 '. The distance b between the reference surface 13 ′ and the first contact portion 16 ′ in the axial direction is equal to the insertion port 1.
The distance (reference distance) a between the reference surface 13 ′ and the facing part 22 ′ when the screwing amount of the fastening member 2 into the screw member 1 is an appropriate amount is equal to the distance a. Note that the protruding piece 15 ′ is
The reference surface 13 ′ is abutted against the confronting portion 22 ′ to restrict the tightening limit of the tightening member 2. 2 contact part 2
Also used for 4 '. Further, the facing portion 22 ′
It is formed outside the base of the insertion opening 11 of the joint main body 1 by a projection 23 'on the end face formed perpendicular to the axis thereof.

The same effect as that described with reference to FIGS. 1 to 5 is also exerted in this resin pipe joint A. That is,
As shown in FIG. 11, when the facing portion 22 'hits the first contact portion 16' of the projecting piece 15 ', the reference surface 13' and the facing portion 22 '.
Is the distance b between the reference surface 13 'and the first contact portion 16'.
Is determined to be equal to the reference interval a, and the screwing amount of the fastening member 2 becomes an appropriate amount. Then, after the fastening member 2 is screwed in by an appropriate amount, when the fastening member 2 is further screwed in, the protruding piece 15 ′ is repelled by the projection 23 ′ and emits a sound. It is confirmed that the screw has been screwed in the amount. When the tightening member 2 is further tightened from the adjusted position shown in FIG. 11, the protruding piece 15 ′ is pushed down and retracted into the concave portion 14 ′, and the facing portion 22 ′ is moved to the reference surface 1.
An appropriate tightening allowance for additional tightening is regulated by contacting 3 '. Therefore, the reference surface 13 ′ is provided with the second contact portion 2, which is in contact with the facing portion 22 ′ and regulates the tightening limit of the fastening member 2.
Also used for 4 '.

In a resin pipe joint of the type in which a tightening regulating mechanism is provided on the joint body 1 and the facing portion 22 is provided on the tightening member 2, as shown in FIGS. 6 and 7 showing another embodiment. By providing recesses 26 at a plurality of locations in the circumferential direction of the fastening member 2 as the facing portions 22, the recesses 26 are provided.
It is also possible to use the walls formed between. The structure of the joint main body 1 shown in FIG. 6 is the same as that described with reference to FIGS. 1 and 3 to 5, and therefore, the same portions are denoted by the same reference numerals and detailed description thereof will be omitted.

In the resin pipe joint A shown in FIG.
The same operation as that described with reference to FIGS. That is, when the fastening member 2 is screwed into the insertion port portion 11, and the facing portion 22 hits the first contact portion 16 of the projecting piece 15,
The interval between the reference surface 13 and the facing portion 22 is determined to be equal to the interval b between the reference surface 13 and the first contact portion 16 and becomes a reference interval.
The screwing amount of the fastening member 2 becomes an appropriate amount. When the fastening member 2 is screwed in by an appropriate amount and then further tightened, the protruding piece 15 is repelled by the facing portion 22 and emits a sound. It is confirmed that only screwed. When the tightening member 2 is further tightened from the adjusted position, the protruding piece 15 is pushed down and retracted into the concave portion 14, and the facing portion 22 is moved to the reference surface 1.
3, the appropriate tightening allowance for additional tightening is regulated. Therefore, the reference surface 13 is also used as the second contact portion 24 that restricts the tightening limit of the fastening member 2 when the facing portion 22 is in contact with the reference surface 22.

8 to 10 show still another embodiment. In the resin-made pipe joint according to this embodiment, a tightening control mechanism is provided on the joint body 1, and the facing portion 22 is formed of the tightening member 2.
It is a type provided in. The fastening member 2 is provided with a plurality of concave portions 27 and convex portions 28 which are long in the axial direction on the outer periphery thereof. The concave portion 27 and the convex portion 28 are originally provided to exert a non-slip function when the fastening member 2 is tightened with a hand or a tool, but in this embodiment, Of the concave portion 27 and the convex portion 28 exhibiting such an anti-slip function, the convex portion 28 is
It can be used as 2. That is, the insertion port 1 is located outside the root of the insertion port 11 of the joint body 1.
An end face perpendicular to one axis is formed, and the end face is used as a reference plane 13. A protruding piece 15 provided on the joint body 1 and extending in the axial direction of the insertion port 11 protrudes forward of the reference surface 13 and, as shown in FIGS. It is provided at a position facing the end face and the concave portion 27. A first contact portion 16 is provided at the tip of the projecting piece 15, and the first contact portion 16 is provided with the fastening member 2 having the facing portion 22 facing the reference surface 13.
When the screw 1 is screwed into the bracket 1, it comes into contact with the facing portion 22. Further, the distance “b” between the reference surface 13 and the first contact portion 16 in the axial direction is determined by adjusting the fastening member 2 to the insertion port 11.
Is equal to the distance (reference distance) a between the reference surface 13 and the facing portion 22 when the screwing amount of the screw becomes an appropriate amount. The base 15a of the protruding piece 15 is connected to the reference surface 13, and when the protruding piece 15 is pushed down by the fastening member 2 and overlaps the reference surface 13, as shown in FIG. The outer surface of the piece 15 is formed as a second contact portion 15b with which the facing portion 22 abuts to regulate the tightening limit of the fastening member 2.

In this resin pipe joint A, the fastening member 2
When adjusting the screwing amount of the pipe properly,
Then, the tightening member 2 fitted into the fitting 00 is screwed into the insertion opening 11 of the joint body 1. The pipe 200 is inserted in the insertion port 110 in advance. In this manner, as shown in FIG. 8, the facing portion 22 of the fastening member 2 is
When the first contact portion 16 of the tip of
The distance between the first contact portion 16 and the reference surface 13 is determined to be equal to the distance between the reference surface 13 and the first contact portion 16. Therefore, the distance between the reference surface 13 and the facing portion 22 is determined as the reference distance a, and the screwing amount of the fastening member 2 becomes an appropriate amount. When the fastening member 2 is screwed in an appropriate amount, the insertion port 11 and the pipe 2
Good sealing performance at the connection point with the pipe 200 is ensured, and at the same time, the pipe 200 is prevented from being pulled out.

After the tightening member 2 is screwed in by an appropriate amount as shown in FIG. 8, the tightening member 2 is further screwed in.
Due to the rotation of the facing portion 22 caused by the screwing, the facing portion 22 kicks the projecting piece 15. Therefore, the projecting piece 15 is repelled by the facing portion 22 to emit a sound. Therefore, the worker can hear this sound to confirm that the fastening member 2 has already been screwed in an appropriate amount.

After the tightening member 2 is screwed in by an appropriate amount, the tightening member 2 is further screwed in and further tightened, and the confronting portion 22 is brought into contact with the confronting portion 22 by the rotation of the confronting portion 22 accompanying the screwing. As shown in FIG.
2 and overlaps with the reference plane 13.
The protruding piece 15 pushed down in this way is
The second surface which is the outer surface of the protruding piece 15 when
The confronting portion 22 abuts against the contact portion 15b to restrict the tightening limit of the tightening member 2, and the tightening member 2 cannot be screwed any further.

Here, in the embodiments described with reference to FIGS. 1 to 5, 6 and 7, the base 15a of the protruding piece 15 may be provided continuously with the reference plane 13, as described with reference to FIG. In the embodiment, the base 15a ′ of the protruding piece 15 is
It may be connected to 3 '. In these cases, the concave portions 14, 14 'become unnecessary. In the embodiments described with reference to FIGS. 8 to 10, the joint body 1 is provided with a recessed portion which is recessed behind the reference surface 13, and the protrusion 1 is provided on the bottom surface of the recessed portion.
5 may be connected continuously.

The resin pipe joint according to the present invention is basically
The above-described tightening control mechanism and the facing portion that comes into contact with the first contact portion when the tightening member is screwed into the insertion port portion are separately provided for the joint body and the tightening member. The distance between the reference surface and the first contact portion in the axial direction is equal to the distance between the reference surface and the facing portion when the amount of screwing of the fastening member into the insertion port becomes an appropriate amount. It is sufficient if the interval is When this configuration is adopted, the base of the protruding piece is provided continuously with the bottom surface of the recessed portion recessed behind the reference surface, and the reference surface is brought into contact with the facing portion and It may be used also as a second contact portion that regulates the tightening limit of the tightening member, or the base of the protruding piece is connected to the reference surface, and the protruding piece is pushed down by the tightening member. The outer surface of the protruding piece when overlapping with the reference surface may be formed as a second contact portion that restricts the tightening limit of the tightening member by contacting the facing portion. Further, even if the facing portion is formed by a projection, it is formed by a wall portion formed between the recesses by providing a plurality of recesses in the circumferential direction of the joint body or the fastening member. You may.

[0041]

According to the resin pipe joint of the present invention, the appropriate screwing amount of the tightening member for obtaining the reference surface pressure can be reliably determined without any variation without using a complicated and skillful method as in the prior art. Will be able to do it. In particular, when the tightening member is screwed in an appropriate amount, the elastic piece is repelled and emits a sound, so when working in a narrow space where only hands can be inserted, or when the vision of elderly people is low. Even when a worker works, there is a convenience that an appropriate screwing amount can be accurately determined. Further, by using the tightening restricting tool according to the present invention, it is possible to easily and quickly confirm whether the tightening member has been forgotten to be tightened or whether the tightening state of the tightening member is good. . Further, the fastening member screwed in by an appropriate amount can be further tightened by an appropriate amount.

[Brief description of the drawings]

FIG. 1 is a front view of a joint main body used for a resin pipe joint according to an embodiment of the present invention.

FIG. 2 is a front view of a fastening member used for the resin pipe joint according to the embodiment of the present invention.

FIG. 3 is a partially broken side view of an initial state in which a fastening member is screwed into an insertion opening of the resin pipe joint according to the embodiment of the present invention.

FIG. 4 is a partially cutaway side view when a screwing amount of a tightening member screwed into an insertion port portion of the resin pipe joint according to the embodiment of the present invention is appropriately adjusted.

FIG. 5 is a partially cutaway side view of the resin pipe joint according to the embodiment of the present invention when a tightening member screwed into an insertion opening is tightened.

FIG. 6 is a partially broken side view of an initial state in which a fastening member is screwed into an insertion opening of a resin-made pipe joint according to another embodiment.

FIG. 7 is a front view of a fastening member used for the resin pipe joint of FIG. 6;

FIG. 8 is a partially broken side view when a screwing amount of a tightening member screwed into an insertion port portion of a resin pipe joint according to still another embodiment is appropriately adjusted.

FIG. 9 is a partially broken side view when a tightening member screwed into an insertion opening of a resin-made pipe joint according to still another embodiment is tightened.

FIG. 10 is a front view of a state in which a fastening member is screwed into an insertion opening of a resin pipe joint according to still another embodiment, as viewed from the direction of arrow X in FIG. 8;

FIG. 11 is a partially broken side view of an embodiment in which a tightening restrictor is provided on a tightening member side and an opposing portion is provided on a joint body side.

[Description of References] A Resin pipe joint 1 Joint body 2 Tightening member 11 Insertion port 13, 13 'Reference plane 14, 14' Depressed section 15, 15 'Projection 15a, 15a' Projection base 16, 16 'First contact portion 22, 22' Opposing portion 23 Projection 24, 15b Second contact portion 26 Depression 27 Depression 28 Convex portion 200 Pipe a Reference interval (distance between reference surface and opposing portion) b Reference surface and first contact Spacing between parts

Claims (9)

[Claims] 1. A resin pipe joint comprising: a joint main body having an insertion port; and a fastening member screwed into the insertion port and tightening a pipe inserted into the insertion port. A reference plane perpendicular to the axis of the tightening member screwed into the joint body or the insertion opening of the joint body, and a projection protruding forward of the reference plane and having a tip formed as a first contact portion. A tightening regulation mechanism comprising a piece, and an opposing portion that abuts against the first contact portion when the tightening member is screwed into the insertion port portion. The distance between the reference surface and the first contact portion in the axial direction is different from the reference surface when the screwing amount of the tightening member into the insertion port becomes an appropriate amount. Make sure that the distance is equal to the distance between the facing part Resin pipe fitting to symptoms. 2. A base of the projecting piece is provided continuously with a bottom surface of a recessed portion which is recessed behind the reference surface, and the reference surface is brought into contact with the facing portion so that the fastening member has The resin-made pipe joint according to claim 1, which is also used as a second contact portion for regulating a retightening limit. 3. The base of the protruding piece is connected to the reference surface, and the outer surface of the protruding piece when the protruding piece is pushed down by the fastening member and overlaps the reference surface, The resin pipe joint according to claim 1, wherein an opposing portion is abutted to form a second contact portion that regulates a tightening limit of the tightening member. 4. The resin pipe joint according to claim 1, wherein said facing portion is a projection. 5. The confronting portion is a wall formed between the concave portions by providing concave portions at a plurality of circumferential positions of the joint body or the tightening member. The resin-made pipe joint according to any one of claims 2, 3, and 4. 6. The resin pipe joint according to claim 4, wherein said protruding piece is a thin piece which is repelled by said opposing portion and emits sound when kicked by said opposing portion. 7. A resin pipe joint comprising: a joint body having an insertion port; and a fastening member screwed into the insertion port and tightening a pipe inserted into the insertion port. An end surface perpendicular to the axis of the insertion portion is formed outside the base of the insertion portion in the joint body, and the end surface is used as a reference surface, and is provided on the joint body and the insertion portion is provided. The protruding piece extending in the axial direction is projected forward of the reference surface, and at the tip of the protruding piece, the tightening member having a facing portion facing the reference surface is screwed into the insertion port. A first contact portion which comes into contact with the confronting portion when the first contact portion is provided, and a distance between the reference surface and the first contact portion in the axial direction is determined by an amount of screwing of the fastening member into the insertion port. The reference plane and the confronting portion when Resin pipe fitting, characterized in that has an equivalent interval and interval. 8. The fastening member according to claim 7, wherein a plurality of concave portions and convex portions extending in the axial direction are alternately provided on an outer periphery thereof, and the facing portion is formed by the convex portion.
The resin pipe joint described in the above. 9. A resin pipe joint comprising: a joint body having an insertion port; and a fastening member screwed into the insertion port and tightening a pipe inserted into the insertion port. A front end face provided on the fastening member and perpendicular to the axis thereof is used as a reference surface, and a protruding piece provided on the fastening member and extending in the axial direction projects forward of the reference surface. A first contact portion which comes into contact with the opposed portion when the fastening member is screwed into the insertion port portion of the joint main body having an opposed portion facing the reference surface at the tip of the protruding piece. Wherein the distance between the reference surface and the first contact portion in the axial direction is equal to the distance between the reference surface and the confronting portion when the amount of screwing of the fastening member into the insertion opening becomes an appropriate amount. Characterized by having a spacing equivalent to the spacing between .