JPH06207694A - Seal ring for resin pipe joint and connecting structure between resin pipe using seal ring and joint body - Google Patents

Abstract

PURPOSE:To facilitate and ensure the seal action and the fixing with respect to a resin pipe without deteriorating the seal action with respect to a joint body. CONSTITUTION:A seal ring 1 is composed of a cylindrical part 35 having an uniform wall thickness, extending from its one end by a predetermined distance, and a joint side tapered part 37 having a wall thickness which gradually increases, extending from the cylindrical part 35 to a substantial center thereof. Meanwhile, a blind nut side tapered part 9 is formed, extending from the other end to the center thereof. A circumferential groove 41 is formed at the outer peripheral surface of the seal ring 1 between the joint side tapered part 37 and the blind nut side tapered part 39. Four cut-in parts 43 are formed extending from the front end of the blind nut side tapered part 39 to the groove 41 so that the blind nut side tapered part 39 is split into four pieces. Further, a radially overhanging flange-like stopper part 39 is formed at the end part of the cylindrical part 35, and is formed over the entire periphery thereof with an annular protrusion 33 projected on the axially inward of the seal ring 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin pipe by fitting a cap nut into a threaded portion provided on the outer peripheral surface of the joint body with the end portion of the resin pipe fitted in the joint body. A seal ring that is fitted to the outer periphery of the resin pipe and is interposed between the end surface of the joint body and the inner wall surface of the cap nut when connecting the joint body, and the resin pipe and joint using the seal ring Regarding the connection structure with the main body.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
With the end portion 102 of the resin pipe 101 fitted in the joint body 103, the cap nut 105 is screwed from the resin pipe 101 side to the threaded portion 104 provided on the outer peripheral surface of the joint body 103. When connecting with 103,
It is known to fit a seal ring 107 between the end surface 103a of the joint body 103 and the inner wall surface 105a of the cap nut 105, which is fitted to the outer periphery of the resin pipe 101.

As shown in FIG. 4, the cross section of the seal ring 107 is formed in a substantially triangular shape protruding to the outer peripheral side. When the seal ring 107 is fitted on the outer peripheral side of the resin pipe 101 and the cap nut 105 is screwed. The taper portion 109 located on the end surface 103a side of the joint body 103 is the end surface 103 of the joint body 103.
On the other hand, the tapered portion 111 on the inner wall surface 105a side of the cap nut 105 contacts the cap nut inner wall surface 105a. When the joint body is further screwed, the joint body end surface 103a and the cap nut inner wall surface 105a which are in contact with each other receive a contradictory pressing force.
The taper portion 109 on the 3a side is brought into contact with the end face 103a to seal the end surface 103a.

[0004]

However, in this connection structure, when the cap nut 105 is tightened, the taper portion 109 of the seal ring 107 causes the end surface 103 of the joint body to be closed.
The force pressed against the end surface 103a on the a side is increased and the sealing action can be achieved.
If the connection strength between the resin pipe 101 and the resin pipe 101 is weak, the seal ring 1
07 and the resin pipe 101, that is, the joint body 103 and the resin pipe 101 may be separated. Further, the sealing action between the seal ring 101 and the resin pipe was insufficient.

In this seal ring 107, by tightening the cap nut 105, the inner wall surface 105a of the inner wall surface 105a of the cap nut inner wall surface 105a is tapered.
To make the inner diameter of the tapered portion 111 smaller so as to generate the fixing action, but the deformation does not occur easily, and sufficient deformation for the fixing action occurs. There was a problem that it was difficult.

Therefore, the present invention solves the above-mentioned problems, and a sealing ring for a resin pipe joint that can easily and reliably perform the sealing action and the fixing with the resin pipe without impairing the sealing action with the joint body side. , And a connection structure between a resin pipe and a joint body using the seal ring.

[0007]

A seal ring for a joint for a resin pipe according to claim 1, which is made in order to achieve this object, has a structure in which the end portion of the resin pipe is fitted into the joint body, By screwing the cap nut from the resin pipe side to the threaded portion provided on the outer peripheral surface, when connecting the resin pipe and the joint body, the resin pipe is fitted to the outer periphery of the resin pipe end portion and A seal ring interposed between the end surface of the joint body and the inner wall surface of the cap nut, the cross section of which is formed in a substantially triangular shape projecting to the outer peripheral side, and the cap nut is fitted to the outer periphery of the resin pipe. When the screw is screwed, the taper portion located on the end face side of the joint body is a seal ring of a resin pipe joint configured to come into contact with the end face of the joint body for sealing, and the end face of the joint body. Side taper part and the inner wall surface side of the above cap nut In the outer peripheral surface between the tapered portion,
A groove provided along the circumferential direction and a notch provided from the end of the taper portion on the inner wall surface side of the cap nut to the groove, and dividing the taper portion on the inner wall surface side of the cap nut into two or more pieces; A stopper portion provided so as to project inward in the radial direction from the end portion of the tapered portion on the end surface side of the joint body,
A protrusion protruding in a ring shape from the stopper portion toward the inner side in the axial direction, and the cap nut inner wall surface side tapered portion divided into two or more pieces by the pressing force when the cap nut is screwed. It is characterized in that it can be moved from the groove portion to the inner peripheral side.

According to a second aspect of the present invention, there is provided a connection structure for a resin pipe and a joint body, wherein the end portion of the resin pipe is fitted into the joint body, and the threaded portion provided on the outer peripheral surface of the joint body has the above-mentioned structure. A connection structure for connecting the resin pipe and the joint body by screwing a cap nut from the resin pipe side, wherein the outer periphery of the resin pipe end and the end surface of the joint body and the inside of the cap nut The seal ring according to claim 1 is interposed between the wall surface and the wall surface, and a collar portion is erected at a position at a predetermined distance from the threaded portion of the outer peripheral surface of the joint body, and the cap nut is screwed into the flange portion to be fixed. When the connection is completed, a retightening bush having a width corresponding to the distance between the cap nut and the flange of the joint body is detachably attached between the cap nut and the flange. Is characterized by.

[0009]

According to the seal ring of the first aspect, the seal ring is fitted on the outer circumference of the end portion of the resin pipe, and the end portion of the resin pipe is fitted on the outer circumference surface of the joint body. When the cap nut is screwed into the provided threaded portion from the resin pipe side, the taper portion located on the end face side of the joint body (hereinafter referred to as the joint side taper portion) comes into contact with the end face of the joint body, while The taper portion located on the inner wall surface side of the cap nut (hereinafter referred to as the cap nut side taper portion) contacts the inner wall surface of the cap nut. Then, as they are further screwed together, an opposing pressing force is applied from the abutting end of the joint body and the inner wall surface of the cap nut, and the pressing force completes the sealed state between the joint-side tapered portion and the end of the joint body. It

Further, when the seal ring is fitted on the outer circumference of the end portion of the resin pipe, it is possible to prevent the resin pipe 11 from being inserted by mistake because the stopper portion does not allow the resin pipe 11 to be inserted. Further, since the projection of the stopper portion bites into the end surface of the resin pipe, a sealing action between the resin pipe and the seal ring is achieved.

On the other hand, the cap nut side taper portion receives a pressing force from the inner wall surface of the cap nut to the joint body end face side and a pressing force to the axial center side of the seal ring at the same time. A groove is provided along the circumferential direction on the outer peripheral surface between the cap nut side taper part and the joint side taper part to reduce the wall pressure at that part. Since the cap nut side taper portion is divided into two or more pieces by the notch provided over the groove, the cap nut side taper portion divided into two or more pieces by the pressing force on the center side of the seal ring shaft, Easily moves from the groove with thin wall pressure to the inner circumference. At that time, the gap between the grooves widens. Therefore, the inner diameter formed by each of the divided pieces of the cap nut side taper portion becomes smaller than the original inner diameter, and the cap nut side taper portion is fixed so as to bite into the resin pipe. In this way, the sealing action with the joint body side, the sealing action with the resin pipe, and the fixing are easily and reliably performed.

According to the connection structure of the second aspect,
The seal ring according to claim 1 is interposed between the outer periphery of the end portion of the resin pipe and the end surface of the joint body and the inner wall surface of the cap nut, and the additional tightening bush is provided between the cap nut and the flange portion. It is installed. The retightening bush is in a predetermined connection completed state by screwing a cap nut, that is, when the seal ring according to claim 1 reliably seals the joint body and the resin pipe. Has a width corresponding to the distance between the cap nut and the flange portion of the joint body.

Therefore, if the cap nut is tightened with the additional tightening bush attached, and the tightening is stopped when the cap nut comes into contact with the additional tightening bush and cannot be tightened any more, an ideal seal is always obtained. The completion status is obtained. Therefore, for example, in the past, only a skilled worker could obtain the desired sealing completion state, but by using the connection structure that uses this additional tightening bush, anyone can easily achieve the desired sealing completion state. You can do it. Furthermore, if water leakage occurs after the cap nut is tightened or during actual use, the cap nut can be retightened a desired number of times by removing the retightening bush, and the sealing action is re-established. Can be assured.

[0014]

EXAMPLES Examples of the present invention will be described below. FIG. 1 is a partial cross-sectional perspective view of a seal ring of a resin pipe joint according to an embodiment of the present invention and a connecting structural element between a resin pipe and a joint body having the seal ring interposed therebetween, and FIG. It is sectional drawing which shows the state until after an assembly. As shown in FIG. 1, the connection structure in this embodiment includes a seal ring 1, a resin pipe 11, a joint body 13, a cap nut 15, and a retightening bush 17.

An outer cylinder 21 and an inner cylinder 23 are coaxially arranged at one end of the joint body 13 with a gap into which the end of the resin pipe 11 can fit. The other end of the joint body 13 is fixed to a device (not shown). A threaded portion 21a is formed on the outer periphery of the distal end portion of the outer cylinder 21 of the joint body 13, and the cap nut 15 can be screwed into the threaded portion 21a. Further, a collar portion 25 is formed at a position at a predetermined distance from the screw portion 21a, and the collar portion 25 has a substantially hexagonal cross section. A bamboo shoot-like groove 23 a is provided at the tip of the inner cylinder 23.

On the other hand, the additional tightening bush 17 is attached between the screw portion 21a of the outer cylinder 21 and the collar portion 25, and as shown in FIG. 1, has an L-shaped cross section and a substantially C-shaped outer shape. And is made of a spring material. Next, the seal ring 1 will be described in detail. This seal ring 1
As shown in FIG. 2, connect the end 12 of the resin pipe 11 to the joint body 1
The outer cylinder 21 and the inner cylinder 2 are fitted onto the inner cylinder 23 of
3 in the state of being fitted between
When connecting the resin pipe 11 and the joint body 13 by screwing the cap nut 15 from the side of the resin pipe 11 to the end face 21b of the outer cylinder 21 of the joint body 13 which is fitted to the outer periphery of the resin pipe 11. The cap nut 15 is interposed between the cap nut 15 and the inner wall surface 15a.

The seal ring 1 is formed in a substantially triangular shape with its cross section protruding to the outer peripheral side, and the inner periphery thereof is made of a resin pipe 11.
It is almost the same as the outer diameter. A stopper portion 31 is formed on one end side of the seal ring 1 and extends radially inward in a flange shape. The stopper portion 31 has a projection 33 projecting inward in the axial direction of the seal ring 1 in an annular shape over the entire circumference. Has been formed. When the seal ring 1 is attached to the resin pipe 11, the stopper portion 31 is provided.
When 1 is inserted into the seal ring 1, it stops in a state of contacting the stopper portion 31 and cannot be inserted any further, and positioning is performed. Also, it will not be inserted from the other side.

In the seal ring 1, a cylindrical portion 35 having a constant thickness is formed at a predetermined distance from the one end side where the stopper portion 31 is provided. And the cylindrical portion 3
From 5 to almost the center of the seal ring 1 has a taper shape in which the wall thickness gradually increases, and is located on the end face 21b side of the outer cylinder 21 of the joint body 13 when the present connection structure is assembled.
Hereinafter, the joint side taper portion 37 will be referred to. On the other hand, the end portion on the opposite side to the center of the seal ring 1 also has a taper shape, which is located on the inner wall surface 15a side of the cap nut 15, and hence will be hereinafter referred to as a cap nut side taper portion 39.

A groove 41 is provided between the joint side taper portion 37 and the cap nut side taper portion 39 along the circumferential direction on the outer peripheral surface thereof. As shown in FIGS. 1 and 3, four notches 43 are provided in the present embodiment from the tip of the cap nut side taper portion 39 to the groove 41, and the cap nut side taper portion 39 is divided into four pieces. It is divided. Further, a small groove 45 is formed on the inner circumference of the cap nut side taper portion 39 along the circumferential direction at a predetermined distance inward from the tip end portion.

Next, the operation of the present seal ring 1 will be described according to the work procedure for assembling the present connection structure. First, the seal ring 1 is fitted to the end 12 of the resin pipe 11. In this case, as described above, since the stopper portion 31 is provided, the resin pipe 11 cannot be inserted from the stopper portion 31,
It is possible to prevent the wrong installation. Also,
If you insert it until it abuts on the stopper 31, the end 1
2 and the protrusion 33 of the stopper portion 31 is then positioned.
Since it digs into the end surface of the resin pipe 11, the sealing action between the resin pipe 11 and the seal ring 1 is fulfilled.

Subsequently, as shown in FIG. 2A, the end portion 12 of the resin pipe 11 to which the seal ring 1 is attached is fitted onto the inner cylinder 23 of the joint body 13. Then, as shown in FIG. 2B, the end 12 of the resin pipe 11 is connected to the outer cylinder 21 and the inner cylinder 2.
Insert between 3 and. At this time, since the fitting direction side of the seal ring 1 is the cylindrical portion 35 having a constant wall thickness, the cylindrical portion 35 serves as a guide, and the seal ring 1 is slanted between the outer cylinder 21 and the inner cylinder 23. It is prevented from getting into. The presence of the cylindrical portion 35 is effective because the conventional one which is composed of only the tapered portion is often fitted obliquely. Then, with the end surface 21b of the outer cylinder 21 in contact with the joint side taper portion 37 side, further fitting cannot be performed.

In this state, the cap nut 15 is screwed into the screw portion 21a of the outer cylinder 21 from the resin pipe 11 side. Then, the joint side tapered portion 37 contacts the end surface 21b of the outer cylinder 21, while the cap nut side tapered portion 39 contacts the inner wall surface 15a of the cap nut 15. When the cap nut 15 is further screwed, the pressing force that opposes the outer cylinder end surface 21b and the cap nut inner wall surface 15a that are in contact with each other. A strong sealed state is completed between the two.

On the other hand, the cap nut side taper portion 39 receives a pressing force from the inner wall surface 15a of the cap nut 15 to the outer cylinder end face 21b side and a pressing force to the axial center side of the seal ring 1 at the same time. As shown in FIG. 3 (A) again, the seal ring 1 has a groove 41 between the cap nut side tapered portion 39 and the joint side tapered portion 37 to reduce the wall thickness of the groove 41.
Further, the cap nut side taper portion 39 is 4 by the notch 43.
Since it is divided into one piece, the cap nut side taper portion 39, which is divided into four pieces by the pressing force to the center side of the seal ring shaft, easily moves from the groove 41 portion having a small wall thickness to the inner peripheral side.

Therefore, when considering only the seal ring 1, as shown in FIG. 3 (B), the interval between the grooves 41 is widened, the groove 41 is bent inward, and the vicinity of the tip portion of the cap nut side taper portion 39 is obtained. Then, it is deformed so that the notch 43 is eliminated. Therefore, the inner diameter formed by the divided pieces of the cap nut side tapered portion 39 is smaller than the original inner diameter.

Therefore, in the seal ring 1, as shown in FIG. 2 (C), the small groove 45 provided on the inner circumference of the cap nut side taper portion 39 bites into the resin pipe 11, and
Actually, the tip end of the cap nut side taper portion 39 is the cap nut 1
Protrude to the back of 5. Since the protruding end portion of the cap nut side taper portion 39 is not pressed by the cap nut 15 and is divided into four, the end of each divided piece spreads like a trumpet. Therefore, the loosening function of the cap nut 15 is also fulfilled.

On the other hand, due to the deformation of the cap nut side taper portion 39, a part of the resin pipe 11 is deformed and pushed into the bamboo shoot-shaped groove 23a provided in the inner cylinder 23 of the joint main body 13 to prevent the retaining seal. You can When such a state as shown in FIG. 2C (this is referred to as a sealing completed state) is achieved, the sealing action with the joint body 13 side and the fixing with the resin pipe 11 are reliably performed. However, in advance,
It is advisable to test the position of the cap nut 15 in the completed sealing state and determine the width of the retightening bush 17 in correspondence with the position.

That is, according to the present connecting structure including the seal ring 1 and the additional tightening bush 17, the additional tightening bush 17 having a predetermined width is provided with the screw portion 21a of the outer cylinder 21 and the collar portion 25.
Install it between and and tighten the cap nut 15,
By stopping the tightening when it comes into contact with the additional tightening bush 17 and cannot be tightened any more, the sealing completed state shown in FIG. 2C is always obtained. Therefore, for example, what has been conventionally required only a skilled worker to obtain a desired sealing completed state, but anyone can easily achieve a desired sealing completed state by using the retightening bush 17.

Further, if water leakage occurs after the completion of tightening or during actual use, the additional tightening bush 17
Is removed from the opening 17a and the like, the cap nut 15 can be retightened a desired number of times, and the sealing action can be secured again. On the other hand, for example, the cap nut 15 is the flange portion 2 of the joint body 13.
If the sealing completed state is obtained in the state of being in contact with 5, it becomes impossible to deal with the case where water leakage occurs after the completion of tightening or during actual use.

As described above, according to the seal ring 1 of this embodiment, the sealing action with the resin pipe 11 and the fixing action can be reliably performed without impairing the sealing action with the joint body 13 side. is there. On the other hand, according to the present connection structure including the seal ring 1 and the additional tightening bush 17, anyone can easily achieve a desired sealing completion state, and further, the cap nut 1
Even after the completion of tightening of No. 5 or when water leaks during actual use, the retightening bush 15 can be removed and the cap nut 17 can be retightened a desired number of times, so that the sealing action is ensured again. Can be

Further, the present invention is not limited to the above embodiments, and can be implemented in various modes without departing from the gist of the present invention. For example, in the above embodiment, four notches 43 are provided in the cap nut side taper portion 39 of the seal ring 1 and the cap nut side taper portion 39 is divided into four pieces, but the number is not limited to four and two pieces are provided. It only has to be divided into the above. The cross-sectional shape and outer shape of the additional tightening bush 17 are not limited, and even after the cap nut 15 is tightened to the tightening completed position, the additional tightening bush 17 is not loosened.
It is sufficient to remove it alone.

[0031]

As described above, according to the seal ring of the resin pipe joint of the first aspect, the sealing action and the fixing with the resin pipe are easy and reliable without impairing the sealing action with the joint body side. It has an extremely excellent effect that it can be performed at any time.

According to the connection structure of the resin pipe and the joint body according to the second aspect, anyone can easily realize a desired sealing completed state, and even when it is necessary to further tighten the cap nut, the additional tightening bush is provided. Is removed, and the cap nut can be retightened a desired number of times, and the sealing action can be made reliable again, which is an extremely excellent effect.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a seal ring of a resin pipe joint that is an embodiment of the present invention and a connection structural element that interposes the seal ring.

FIG. 2 is a cross-sectional view showing a state from before assembling to after assembling the connection structure.

3A is a perspective view showing a seal ring before deformation, and FIG. 3B is a perspective view showing the seal ring after deformation.

FIG. 4 is a partial cross-sectional view of a conventional seal ring and a connecting structural element having the seal ring interposed therebetween.

[Explanation of symbols]

1 ... Seal ring, 11 ... Resin tube, 13 ...
Joint body, 15 ... Cap nut, 17 ... Re-tightening bush 21 ... Outer cylinder, 23 ... Inner cylinder, 31 ... Stopper part, 33 ... Projection, 35 ... Cylindrical part, 3
7 ... Joint side taper part, 39 ... Cap nut side taper part, 4
1 ... Groove, 43 ... Notch

Claims (2)

[Claims] 1. The resin pipe is obtained by screwing a cap nut from the resin pipe side to a threaded portion provided on the outer peripheral surface of the joint body with the end portion of the resin pipe fitted in the joint body. Is a seal ring that is fitted to the outer periphery of the resin pipe end portion and is interposed between the end face of the joint body and the inner wall surface of the cap nut when connecting the joint body and Formed in a substantially triangular shape projecting to the side, and when fitting the outer periphery of the resin pipe and screwing the cap nut, the tapered portion located on the end face side of the joint body contacts the end face of the joint body. A seal ring for a resin pipe joint configured to be in contact with and capable of sealing, in the outer circumferential surface between the tapered portion on the end surface side of the joint body and the tapered portion on the inner wall surface side of the cap nut, in the circumferential direction. Along the groove on the inner wall surface of the cap nut. A notch that is provided from the end of the pad portion to the groove and divides the tapered portion on the inner wall surface side of the cap nut into two or more pieces; and a flange shape radially inward from the end of the tapered portion on the end surface side of the joint body. A stopper portion that is provided so as to project to the inner side of the stopper portion, and a protrusion that projects annularly inward from the stopper portion, and
A seal ring for a resin pipe joint, wherein a cap nut inner wall surface side tapered portion divided into two or more pieces is configured to be movable from the groove portion to an inner peripheral side. 2. The resin pipe is obtained by screwing a cap nut from the resin pipe side to a threaded portion provided on the outer peripheral surface of the joint body with the end portion of the resin pipe fitted in the joint body. And a joint structure for connecting the joint body to the joint body, wherein the seal ring according to claim 1 is interposed between the outer periphery of the resin pipe end portion and the end surface of the joint body and the inner wall surface of the cap nut. In addition, when the flange portion is erected at a position at a predetermined distance from the threaded portion of the outer peripheral surface of the joint body, and the cap nut is screwed into a predetermined connection completed state, the cap nut and the joint A connecting structure for a resin pipe and a joint body, wherein a tightening bush having a width corresponding to a distance from a flange portion of the body is detachably mounted between the cap nut and the collar portion.