JPH07180787A - Seal structure in connection part of tubular member - Google Patents

Abstract

PURPOSE:To connect a pipe member to a joint without providing the pipe member with a thread cutting portion, and to heighten the reliability of the sealing performance of a connection part, and to prevent electrolytic corrosion in a connected part between the pipe member and the joint which are made of metal of different kinds. CONSTITUTION:First and the second seat faces 12, 13 are formed in the socket equivalent part 11 of a joint 10, and a projection 23 is provided in the spigot equivalent part 21 of a pipe member 20. The projection 23 is pushed by a pushing ring 30 to press the spigot equivalent part 21 in an inserting direction F for crashing an elastic sealing ring 40 by the third seat face 24 which is provided in the spigot equivalent part 21 and has a tapered shape, and the first and the second seat face 12, 13. The sealing ring 40 comes into face-contact with each of seat faces 12, 13, 24. The first coating layer 17 formed of an electrical insulating body is provided at a spot opposite to the tip end face 28 of the spigot equivalent part 21 in the socket equivalent part 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for water-tightly sealing a connecting portion when connecting tubular members such as joints and pipes (pipe materials) for piping.

[0002]

2. Description of the Related Art FIG. 8 shows a seal structure for a joint between a joint and a tube, which has been frequently used. In this case, a sealing tape (not shown) made of an electric insulator is wound around a taper outer screw e formed at the end of the pipe body d, and the taper outer screw e is provided on the connection port b of the joint a. Inner screw c
It is screwed into.

[0003]

However, in the conventional structure, since it is necessary to form the taper outer thread e at the end of the pipe body d, the wall thickness of the threaded portion f at the end of the pipe body d is different. There is a problem in that the thickness becomes thinner than that of the portion and the strength is reduced.

Further, in the conventional structure, the seal tape (not shown) which is wound around the taper outer screw e in advance may be worn out by the screw fitting of the taper inner screw c and the taper outer screw e. There is a problem that it is difficult to improve the reliability of the above, and when the joint a and the pipe body d are made of dissimilar metals, galvanic corrosion is likely to occur due to contact between dissimilar metals at the worn parts of the seal tape. It was

The present invention has been made in view of the above problems. That is, the present invention enables the tubular members to be connected to each other without providing a threaded portion on the tubular member such as the pipe body or the joint so as not to cause strength reduction at the end portion of the pipe body and to seal the connection portion. (EN) Provided is a connection sealing structure for a tubular member with improved reliability of performance, and in such a sealing structure, even if the tubular members to be connected are made of dissimilar metals, the electrolytic corrosion of the tubular members is ensured. An object of the present invention is to provide a sealing structure for a connecting portion of a tubular member that can be prevented.

[0006]

According to a first aspect of the present invention, there is provided a sealing structure for a connecting portion of a tubular member, wherein the first tubular member is provided with a portion corresponding to a receiving port and the second tubular member is provided with a portion corresponding to an insertion port. In the seal structure of the portion, the socket-corresponding portion of the first tubular member includes an annular first seating surface along an imaginary plane orthogonal to the axis and an outer peripheral portion of the first seating surface from the socket-corresponding portion. A concave portion surrounded by a cylindrical second seat surface extending outward is provided, and a protrusion is provided on an outer periphery of a portion corresponding to the insertion opening of the second tubular member. The insertion opening corresponding portion inserted into the reception opening corresponding portion by being pushed by the screwed push wheel is pressed in the insertion direction, and the tip end portion provided on the outer peripheral surface of the tip end of the insertion opening equivalent portion. The upper part of the ball-shaped third seat surface and the first seat surface and second seat surface Above with crushed sealing ring with the contained resilient recess first, second and third
Is in surface contact with each seat surface.

According to a second aspect of the present invention, there is provided a sealing structure for a connecting portion of a tubular member, wherein the first sealing member is made of metal and has a portion corresponding to a receiving port.
A sealing structure of a connecting portion between a tubular member and a second metal tubular member having a portion corresponding to an insertion port, wherein the first tubular member is made of an electrical insulator at a predetermined position on the inner peripheral surface of the portion corresponding to the receiving port. 1
The coating layer is provided with a second coating layer made of an electrical insulator at a predetermined position on the outer peripheral surface of the insertion port corresponding portion of the second tubular member, and the receiving port equivalent portion of the first tubular member is orthogonal to the axis. A recessed portion surrounded by an annular first seating surface along an imaginary plane and a cylindrical second seating surface extending from the outer peripheral portion of the first seating surface toward the outside of the receiving port At the same time, at least a portion of the first seating surface facing the tip end surface of the insertion opening corresponding portion is formed by the surface of the first coating layer, and the second tubular member is formed of a metal on the outer periphery of the insertion opening corresponding portion. Equipped with protrusions,
The second coating layer is formed on the outer peripheral surface of the tip end side of the protrusion, and the protrusion is pushed by a push ring screwed into the receptacle corresponding portion to be inserted into the receptacle corresponding portion. The mouth-corresponding portion is pressed in the insertion direction, and the third seating surface of the tapered shape provided on the outer peripheral surface of the tip end portion of the insertion-corresponding portion, the first seating surface of the receptacle-corresponding portion and the first seating surface The seal ring, which is housed in the recess and is made of an elastic electrical insulator, is crushed by the two seat surfaces and comes into surface contact with each of the first, second, and third seat surfaces, and A third coating layer made of an electric insulator is provided on the inner peripheral surface of the push ring, and the projection is pushed by the third coating layer.

According to a third aspect of the present invention, there is provided a sealing structure for a connecting portion of a tubular member according to the first or second aspect, which is made of metal and is provided on an outer periphery of a portion corresponding to an insertion opening of the second tubular member. The protrusion is a metal retaining ring fitted and held in a groove formed in an annular shape on the outer periphery of the insertion opening corresponding portion.

According to a fourth aspect of the present invention, there is provided a connecting member sealing structure for a tubular member according to any one of the first, second and third aspects, wherein the first tubular member is a joint, and 2 The tubular member is a pipe body for piping.

[0010]

According to the sealing structure for the connecting portion of the tubular member according to the first, third and fourth aspects of the present invention, the insertion opening corresponding portion of the second tubular member inserted into the receiving opening corresponding portion of the first tubular member. Is pushed by the push ring screwed into the receptacle-corresponding portion to be pushed in the inserting direction.
The second tubular member is the first tubular member without providing a threaded portion on the tubular member.
Connected to the tubular member. Further, the sealing ring housed in the recess corresponding to the receptacle corresponds to the first seat surface and the second seat surface surrounding the recess, and the tapered third seat surface corresponding to the insertion opening. Since they are crushed by and are in contact with their respective bearing surfaces, the gap between the pipe line at the connecting portion of each tubular member and the outside of the pipe line is surely closed by the sealing ring. Be done. At that time, since the contact state between the sealing ring and each seating surface is a surface contact, the sealing area is correspondingly increased and the sealing property is improved.

According to the connecting member sealing structure of the tubular member according to the invention described in claims 2 to 4, the same action as that described for the invention according to claim 1 is exhibited, and
The first coating layer and the second coating layer prevent electrolytic corrosion caused by the contact between the receptacle-corresponding portion and the insertion-portion-corresponding portion, and the electrolytic coating caused by the contact between the push ring and the insertion-corresponding portion is the third coating layer. Is prevented by.

[0012]

1 is a partial sectional view showing a sealing structure for a connecting portion of a tubular member according to an embodiment of the invention described in claims 1, 3 and 4, and 10 is a first tubular member, 20.
Is a second tubular member, and 30 is a push ring.

The first tubular member 10 includes an elbow, cheese,
This corresponds to various joints such as sockets or pipes (pipe materials). The first tubular member 10 is provided with a receiving port equivalent portion 11 at its end. Then, the socket corresponding portion 11 is a virtual plane 101 orthogonal to the axis 100 of the first tubular member 10.
A recess 14 surrounded by an annular first seating surface 12 that is parallel to the first seating surface 12 and a cylindrical second seating surface 13 that extends from the outer peripheral portion of the first seating surface 12 toward the outside of the receiving port equivalent portion 10. Is provided in a stepped shape, and a sleeve portion 16 having a large inner circumference diameter is provided on the outer circumference side of the recess 14 with an inner thread 15 made of a parallel thread.
Is equipped with. Then, the sealing ring 40 is fitted and held in the recess 14. For the sealing ring 40, for example, a rubber ring having a circular cross section and having elasticity is used.

The second annular member 20 corresponds to a pipe body (pipe material) such as pipes, for example, a sprinkler unrolling pipe. The second annular member 20 has an insertion opening equivalent portion 21 at the end. The insertion port corresponding portion 21 has an annular groove portion 22 on the outer periphery in the vicinity of the tip end portion thereof, and a retaining ring 23 is fitted and held in the groove portion 22. The retaining ring 23 projects from the outer circumference of the insertion opening corresponding portion 21. Here, the retaining ring 23 is the insertion opening corresponding portion 21 of the second tubular member 20.
It is an example of a protrusion provided on the outer periphery of the above, and is configured by fitting a ring made of an elastic material having a cutout portion 25 as shown in FIG. 7 into the groove portion 22. The state after the fitting may be the state in which the ring is loosely fitted in the groove portion 22 or the state in which the ring is elastically attached to the groove portion 22. Further, the outer peripheral surface of the distal end portion of the insertion opening corresponding portion 21 is provided with a third seating surface 24 which is a tapered surface.

The push wheel 30 has a base portion 31 on which a rotating tool such as a wrench or a wrench is mounted, and a cylindrical portion 32 having an outer screw 33 which is a parallel screw capable of being screwed with the inner screw 15 and is projected. The engaging stepped portion 34 is formed in a concave shape on the inner periphery of the distal end portion of the tubular portion 32. It should be noted that the outer screw 33 is not provided on the outer peripheral surface of the distal end portion of the tubular portion 32, and this portion is used as a steal portion 35 of the outer screw 33.

An insertion port corresponding portion 21 of the second tubular member 20 is inserted into the receiving port corresponding portion 11 of the first tubular member 10.
In addition, the external thread 33 of the tubular portion 32 of the push ring 30 that is externally fitted to the second tubular member 20 in advance is the internal thread 15 of the receptacle corresponding portion 11.
Is screwed into. On the other hand, the push wheel 3 to the receptacle equivalent portion 11
By the screwing of 0, the step portion 34 of the push wheel 30 engages with the retaining ring 23, and the retaining ring 23 is in the direction indicated by the arrow F,
That is, the second tubular member 20 is pushed in the inserting direction, and accordingly, the second tubular member 20 is pushed in the same direction. As described above, since the second tubular member 20 is pressed in the insertion direction, the elastic sealing ring 40 housed in the recess 14 is provided with the first seating surface 1.
2, the second seat surface 13 and the third seat surface 24 are crushed and are in surface contact with the respective seat surfaces 12, 13, 24.

With the above-described structure, the socket-corresponding portion 1
Since the stepped portion 34 of the push wheel 30 screwed into the connector 1 engages with the retaining ring 23 of the insertion opening corresponding portion 21 and presses the retaining ring 23, the insertion opening equivalent portion 2 from the reception opening equivalent portion 2
1 is prevented from being pulled out, and the first tubular member 10 and the second tubular member 20 are connected. Further, since there is no thread cut portion in the insertion opening corresponding portion 21, it is possible to secure the same thickness as the other portions of the second tubular member 20 in the insertion opening corresponding portion 21, which is that of the insertion opening corresponding portion 21. It helps prevent the strength from decreasing.
Further, a midway point of the gap S between the pipe and the outside of the pipe at the connecting portion between the first tubular member 10 and the second tubular member 20 is closed by the sealing ring 40, and the seal is provided. Since the contact state between the bearing ring 40 and each of the seating surfaces 12, 13, 24 is a surface contact, the sealing area by the sealing ring 40 is correspondingly increased and a high sealing performance is secured, and the reliability of the sealing performance is improved. Will increase.

In the embodiment described with reference to FIG. 1, the socket-corresponding portion 1
Although the first seating surface 12 forming the recess 14 in 1 is parallel to the virtual plane 101 orthogonal to the axis 100 of the first tubular member 10, the first seating surface 12 is
An imaginary plane 10 orthogonal to the axis 100 of the tubular member 10.
It should be in line with 1. The first seat surface 12 is the first tubular member 1
FIG. 2 shows an example of the sealing structure of the connecting portion of the tubular members 10 and 20 which are arranged substantially parallel to the virtual plane 101 orthogonal to the axis 100 of 0. With this, the same action as described with reference to FIG. 1 is exhibited.

In the embodiment described with reference to FIGS. 1 and 2, the snap ring 23 having a quadrangular cross-sectional shape is used, but as shown in FIG. 3, the snap ring 23 having a circular cross-sectional shape is used. It is also possible to use. Note that FIG.
In addition, in FIG. 3, the same or corresponding portions as those shown in FIG. 1 are designated by the same reference numerals. In each of the embodiments described above, the first tubular member 10, the second tubular member 20, the push ring 30, the retaining ring 23, etc. are made of stainless steel, steel, gun metal,
It can be made of a metal selected from cast iron and the like. A rubber ring can be used as the sealing ring 40.

FIG. 4 shows claims 2, 3, and 4.
FIG. 4 is a partial cross-sectional view showing a sealing structure for a connecting portion of a tubular member according to the embodiment of the invention described in FIG. In this embodiment, the difference from that of FIG. 1 is that the first coating layer 17 made of an electrical insulator is provided at a predetermined position on the inner peripheral surface of the receptacle corresponding portion 11 of the first tubular member 10 and the second tubular member 20. The second covering layer 27 made of an electrical insulator is provided at a predetermined position on the outer peripheral surface of the insertion opening corresponding portion 21, and the first seating surface 12 and the second seating surface 13 are the first covering layer. The second coating layer 27 is formed on the outer peripheral surface of the tip end side of the projection (that is, the snap ring 23) provided on the outer periphery of the insertion opening corresponding portion 21 of the second tubular member 20. The third coating layer 37 made of an electrical insulator is provided on the inner peripheral surface of the push ring 31, and the engagement step portion 34 is formed on the third coating layer 37. First, second and third coating layers 17, 27, 3
7 is made of synthetic resin. As the sealing ring 40, a ring made of an electrical insulator, specifically, a rubber ring is used. Other configurations and effects are shown in Figure 1.
Since it is the same as the one described in 1 above, the same reference numerals are given to the same portions and detailed description will be omitted.

FIG. 5 is a partial cross-sectional view showing a sealing structure for a connecting portion of a tubular member according to the third embodiment of the invention. In this embodiment, the difference from that of FIG. 4 is that the first coating layer 17 is provided only at a position facing the distal end surface 28 of the insertion opening corresponding portion 21 of the second tubular member 20, and the first seating surface 12 and The two-seat surface 13 is the same as that described with reference to FIG. Other configurations and effects are similar to those described with reference to FIG. 4, and therefore, the same parts are designated by the same reference numerals and detailed description thereof will be omitted.

According to the sealing structure of the connecting portion of the tubular member described with reference to FIGS. 4 and 5, the function and effect described in FIG. 1, that is, the strength of the insertion-corresponding portion 21 does not decrease, and the sealing performance is reliable. In addition to the action effect of increasing, the following action capable of preventing electrolytic corrosion is exhibited. That is, in these examples, the first tubular member 10
And the direct contact between the second tubular member 20 and the first tubular layer 1
7. The first tubular member 10 and the second tubular member 20 are blocked by the second coating layer 27 and the sealing ring 40.
Even if and are made of dissimilar metals, electrolytic corrosion due to contact of dissimilar metals does not occur. Further, since the third coating layer 37 prevents the second tubular member 20 and the push ring 30 from coming into direct contact with each other, even if the second tubular member 20 and the push ring 30 are made of different metals, they are made of different metals. No electrolytic corrosion caused by contact.

In the embodiment described with reference to FIGS. 4 and 5, although the snap ring 23 has a quadrangular cross section,
As shown in FIG. 6, it is possible to use a snap ring 23 having a circular cross section. Further, the first seating surface 12 of the embodiment described with reference to FIGS. 3 and 5 can be made substantially parallel to the virtual plane 101 as described with reference to FIG.

By the way, when the surface of the first coating layer 17 made of an electrical insulator faces the tip surface 28 of the insertion opening corresponding portion 21 as in the embodiment described with reference to FIGS. There are many advantages. In other words, when performing additional construction such as unwinding piping for sprinklers, the number and length of individual pipes used for the pipes are calculated from the total length of the pipes. If the length can be accurately determined before the pipe material is constructed, the total length of the pipe can be accurately determined after the construction. In this regard, if the tip surface 28 of the insertion opening corresponding portion 21 is applied to the surface of the first coating layer 17 as shown in FIGS. It becomes possible to apply the tip end surface 28 of the corresponding portion 21 to the surface of the first coating layer 17 to construct the second tubular member 20 (pipe material), which means that the length dimension of each pipe material is There is an advantage that it helps to accurately determine the pipe material before construction.

In the present invention, the first tubular member 10 and the second tubular member 10
Both of the tubular members 20 can be pipe materials.

[0026]

According to the first, third and fourth aspects of the present invention, since it is not necessary to provide a threaded portion at the portion corresponding to the insertion opening of the second tubular member, the strength is reduced by providing the threaded portion. There is no room for Also, the first
In the connecting portion between the tubular member and the second tubular member,
Due to the action of the sealing ring that comes into surface contact with each of the third bearing surfaces, a high degree of sealing performance is ensured and the reliability of the sealing performance of the connection portion is increased.

Further, according to the inventions of claims 2 to 4, in addition to such an effect, even if the first tubular member and the second tubular member are made of dissimilar metals, contact with dissimilar metals can be achieved. It is possible to prevent the accompanying electrolytic corrosion.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a sealing structure for a connecting portion of a tubular member according to an embodiment of the invention described in claims 1, 3 and 4.

FIG. 2 is a partial cross-sectional view showing a sealing structure for a connecting portion of a tubular member according to another embodiment of the invention described in claims 1, 3 and 4.

FIG. 3 is a partial cross-sectional view showing a sealing structure of a connecting portion of a tubular member using a retaining ring according to a modified example.

FIG. 4 is a partial cross-sectional view showing a sealing structure for a connecting portion of a tubular member according to an embodiment of the invention described in claims 2, 3 and 4.

FIG. 5 is a partial cross-sectional view showing a sealing structure for a connecting portion of a tubular member according to another embodiment of the invention described in claims 2, 3 and 4.

FIG. 6 is a partial cross-sectional view showing a sealing structure for a connecting portion of a tubular member using a retaining ring according to a modified example.

FIG. 7 is a front view of a retaining ring.

FIG. 8 is a partial cross-sectional view showing a conventional sealing structure for a connecting portion of a tubular member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 1st tubular member 11 Receptacle part 12 1st seat surface 13 2nd seat surface 14 Recess 17 1st coating layer 20 2nd tubular member 21 Corresponding part 23 Retaining ring (projection) 24 3rd seat surface 27 Second coating layer 28 Tip surface of a portion corresponding to the insertion opening 30 Push ring 40 Sealing ring 100 Axis 101 Virtual plane F Insertion direction

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toyotoshi Toyoko 2-4-6 Aioi-dori, Abeno-ku, Osaka-shi, Osaka (72) Inventor Toyofumi Suga 1746 Tsuruhara, Izumisano-shi, Osaka

Claims (4)

[Claims] 1. A seal structure of a connecting portion between a first tubular member having a receiving port corresponding portion and a second tubular member having an insertion port corresponding portion, wherein the receiving port corresponding portion of the first tubular member is aligned with an axis line. A recess surrounded by an annular first seating surface along an imaginary plane orthogonal to each other and a cylindrical second seating surface extending from the outer peripheral portion of the first seating surface toward the outside of the receptacle-equivalent portion The second tubular member is provided with a protrusion on the outer periphery of the portion corresponding to the insertion port, and the protrusion is pushed by a push ring screwed into the portion corresponding to the reception port to insert the insertion port into the portion corresponding to the reception port. The corresponding portion is pressed in the insertion direction, and the third seating surface of the tapered shape provided on the outer peripheral surface of the tip end portion of the insertion opening corresponding portion and the first seat surface and the second seating surface of the receiving opening corresponding portion. By the seat surface, the elastic sealing ring housed in the recess is crushed and the first,
A sealing structure for a connecting portion of a tubular member, which is in surface contact with each of the second and third seat surfaces. 2. A seal structure for a connecting portion between a first tubular member made of metal and having a second tubular member made of metal and having a portion corresponding to an insertion opening, wherein the first tubular member has a receiving structure. A first coating layer made of an electrical insulator is provided at a predetermined location on the inner peripheral surface of the corresponding portion, and a second coating layer made of an electrical insulator is provided at a predetermined location on the outer circumferential surface of the insertion opening corresponding portion of the second tubular member. And the socket-corresponding portion of the first tubular member extends from the annular first seating surface along the virtual plane orthogonal to the axis and the outer peripheral portion of the first seating surface toward the outside of the socket-corresponding portion. A recess surrounded by the protruding second cylindrical seating surface is provided, and at least a portion of the first seating surface facing the tip end surface of the insertion opening corresponding portion is formed by the surface of the first coating layer. And a protrusion made of metal is provided on the outer periphery of the portion corresponding to the insertion opening of the second tubular member, and the second coating layer has the protrusion. Is formed on the outer peripheral surface on the front end side of the insertion port, and the protrusion corresponding to the insertion port corresponding to the insertion port is inserted in the reception port corresponding part by being pushed by the push ring screwed into the reception port corresponding part. The recessed portion is pressed by the third seating surface having a tapered shape provided on the outer peripheral surface of the distal end portion of the insertion opening corresponding portion and the first seating surface and the second seating surface of the receiving opening corresponding portion. The sealing ring made of an elastic electrical insulator housed in the
And a third cover layer made of an electrical insulator is provided on the inner peripheral surface of the push ring in surface contact with each of the third seat surfaces, and the projection is pushed by the third cover layer. A sealing structure for a connecting portion of a tubular member, which is characterized in that 3. A metal retaining ring in which a metal protrusion provided on the outer periphery of the portion corresponding to the insertion opening of the second tubular member is fitted and held in a groove formed in an annular shape on the outer periphery of the insertion portion corresponding to the second tubular member. A connecting member sealing structure for a tubular member according to claim 1 or 2. 4. The first tubular member is a joint, and the second tubular member is a pipe body for piping.
10. A sealing structure for a connecting portion of a tubular member according to any one of 1.