JPH0712272A - Piping member - Google Patents

Abstract

PURPOSE:To provide a piping member which secures watertightness at the end part of a lining steel pipe even though the male threads thereon are screwed in excessively and which can prevent the end part from rusting. CONSTITUTION:A contact wall 7 is provided within a tubular part 2 of a piping member 1 and is equipped with a recess for fitting 12. A flange 15 is furnished on a core 3 made of resin and is equipped with a fit boss 20. The resin core 3 is located in the tubular part 2 with the boss 20 fitted in the recess 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piping member connected to piping. More specifically, the present invention is an improvement of a connecting portion of a piping member with a pipe, and in addition to pipe fittings such as sockets, elbows, cheeses, and unions, valves, strainers, check valves, and other pipe accessory materials. Can be applied to.

[0002]

2. Description of the Related Art Because of the toughness of steel pipes and the corrosion resistance of resin pipes, lining steel pipes whose inner surfaces are coated with a resin for waterproof / corrosion protection are often used for water pipes. However, in this type of lining steel pipe, the inner surface is completely protected by a resin or the like, but the metal is exposed at the end portion. Therefore, when the lining steel pipe is connected to the pipe member, the end surface thereof may come into contact with water or the like and rust may occur. Therefore, in order to protect the end surface of the lining steel pipe and prevent the generation of red water due to rust, a method of mounting a resin core inside the piping member is proposed in Japanese Utility Model Publication No. 2-140089.

The piping member disclosed in Japanese Utility Model Laid-Open No. 2-140089 has a tubular portion 1 of the piping member 100 as shown in FIG.
The resin core 101 is arranged inside 04.
The resin core 101 has a through hole 103, and its outer diameter is considerably smaller than the inner diameter of the piping member 100. A ridge 102 is provided on the outer peripheral surface of the resin core 101. Further, a flange 105 is provided at the end of the resin core 101. And flange 105
The side surface of is fitted into the innermost part of the tapered male screw (PT) for pipe provided on the inner surface of the piping member 100. As a result, the resin core 101 is concentrically arranged near the opening of the tubular portion of the piping member 100.

The end of the pipe such as the lining steel pipe is
The external thread of the outer peripheral surface fits with the internal thread 106 of the tubular portion,
On the other hand, the inner surface of the lining steel pipe is sandwiched between the female screw 106 of the tubular portion and the resin core 101 while being in contact with the outer peripheral surface 107 of the resin core 101. As a result, the end of the lining steel pipe is surrounded by the resin core 101 and the flange 105, and is isolated from the water flowing through the pipe.

[0005]

DISCLOSURE OF THE INVENTION Piping member 1 of the prior art
According to No. 00, as described above, the end of the lining steel pipe is blocked from water by the resin core 101 and the like. Therefore, the end of the lining steel pipe does not come into contact with water, and rusting of the relevant part should be prevented. However, the above effect is fully exhibited on the assumption that the lining steel pipe is joined to the pipe member 100 in an ideal state, and in reality, the lining steel pipe often rusts. .

That is, in the actual piping work, a male pipe thread is cut at the end of the lining steel pipe at the work site, and the end is screwed into the pipe member 100. Here, the length of the male screw to be provided on the lining steel pipe is tentatively determined by the JIS standard, but in reality, it is often the operator's sense. Therefore, it is not uncommon for the length of male pipe threads to be longer than necessary.

However, when an unnecessarily long male screw is screwed into the pipe member 100 of the prior art, the diameter of the lining steel pipe 107 is reduced along the taper of the female screw (PT) of the pipe member 100, and the resin core 101 is compressed. As a result, the flange 105 of the resin core 101 is indicated by the arrow A in FIG.
Then, a gap is generated between the inner walls of the piping member 100. Then, water invades between the inner wall of the piping member 100 and the outer surface of the resin core 101 through the gap formed in the portion indicated by the arrow A.
Therefore, the bent resin core 101 does not function at all, the end surface 108 of the lining steel pipe 107 comes into contact with water, and the portion rusts.

Further, when the piping is installed, the resin core 101 in the piping member 100 cannot be seen from the outside. Therefore, even if the adhesiveness between the resin core 101 and the piping member 100 is impaired by excessive screwing of the lining steel pipe 107 as described above, the operator cannot be aware of it.
Of course, there is no way to repair it. Therefore, in this kind of piping member, even if there is some excessive screwing,
It has been desired to develop a structure in which the adhesion between the resin core 101 and the inner wall of the piping member 100 is maintained.

The present invention focuses on the above-mentioned drawbacks of the prior art, and when the male thread of the lining steel pipe is excessively screwed,
An object of the present invention is to provide a piping member that ensures watertightness at the end of a lining steel pipe and can prevent rusting at the end of the lining steel pipe.

[0010]

According to the present invention for achieving the above-mentioned object, a resin core is provided inside a tubular portion provided with an inner screw, and a pipe is provided between the inner screw and the resin core. In the piping member into which the end portion is inserted, the tubular portion has an abutting wall on the inner surface, the fitting portion is provided on the abutting wall, the resin core has a flange portion, and the flange portion is It is a piping member which is in contact with the contact wall, and a part of the flange portion is fitted with a fitting portion provided on the contact wall.

Another invention for achieving the same object is to provide a resin core inside a tubular portion provided with an inner screw, and insert an end portion of a pipe between the inner screw and the resin core. In the piping member, the resin core has a folded portion folded back in a bag shape at its end, and the outer peripheral surface of the folded portion is in contact with the inner surface of the tubular portion. is there.

Further, according to the invention for achieving the same object, a resin core is internally provided in a tubular portion provided with an inner screw, and an end portion of a pipe is inserted between the inner screw and the resin core. In the piping member, the tubular portion has an abutment wall on the inner surface, the fitting portion is provided on the corresponding abutment wall, the resin core has a flange portion, and the flange portion is provided with a sealing material. The pipe member is in contact with the contact wall.

[0013]

When the pipe such as the lining steel pipe is excessively screwed into the internal thread of the opening of the piping member, the end portion of the lining steel pipe or the like is reduced in diameter along the tapered internal thread of the opening of the piping member. Therefore, the resin core receives a pressing force toward the center. However, in the invention according to claim 1, the abutting wall is provided on the inner surface of the tubular portion, the flange portion of the resin core is in contact with the abutting wall, and the flange portion of the resin core is one of the abutting walls. The portion is fitted with the fitting portion of the contact wall. Therefore, when the resin core receives a force toward the center from the inner surface of the lining steel pipe or the like, the force toward the center is supported by the fitting portion provided on the contact wall. That is, in the piping member of the present invention, the fitting portion provided on the contact wall can support the component in the direction perpendicular to the force toward the center of the piping member. Therefore, the resin core has a large resistance to the force received from the lining steel pipe.

According to the second aspect of the invention, the resin core has a folded portion folded back in a bag shape at its end, and the outer peripheral surface of this folded portion is in contact with the inner surface of the tubular portion. Therefore, in the invention according to claim 2, the contact area between the resin core and the inner surface of the tubular portion is large. Therefore, even if the resin core receives a force in the diameter reducing direction from the lining steel pipe or the like, there is little risk of the resin core peeling from the tubular portion. Further, in the invention according to claim 2, since the contact area between the resin core and the inner surface of the tubular portion is large, even if there is some separation between the two, the watertightness of the end portion of the lining steel pipe is secured by the labyrinth effect. It

According to the third aspect of the present invention, the abutting wall is provided on the inner surface of the tubular portion, the resin core has the flange portion, and the sealing material is interposed therebetween. Therefore, even if the resin core receives a force in the diameter reducing direction from the lining steel pipe or the like and is deformed or slightly moved, these changes are absorbed by the flange portion and the sealing material. That is, the flange portion of the resin core and the contact wall of the tubular portion are
Since it has a certain area, the contact area between the two is secured even if there is a slight deviation between the two. Therefore, according to the third aspect of the invention, the close contact between the contact wall provided on the inner surface of the tubular portion and the flange portion of the resin core is ensured. Therefore, in the third aspect of the invention, even if the resin core receives a force in the diameter reducing direction from the lining steel pipe or the like, the inside of the tubular portion and the outside of the resin core do not communicate with each other. Therefore, the watertightness of the end portion of the lining steel pipe or the like is secured.

[0016]

EXAMPLES Specific examples of the present invention will be described below. FIG. 1 is a sectional view of a piping member according to a specific embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of the main part of FIG. Figure 3
FIG. 2 is an enlarged sectional view of an essential part showing a state in which a lining steel pipe is screwed into the piping member of FIG. 1 with an appropriate fitting amount. Figure 4
It is a principal part expanded sectional view which shows the state which screwed the lining steel pipe excessively into the piping member of FIG. FIG. 5 is an enlarged sectional view of an essential part showing a process of assembling a piping member according to a modified example of the present invention.

1 to 4, reference numeral 1 denotes a pipe member according to a specific embodiment of the present invention. The piping member 1 of this embodiment is
Specifically, it is a socket. The piping member 1 of this embodiment is
A resin core 3 is attached to a tubular portion 2 which is a main body. Sequentially explaining, the tubular portion 2 of the piping member 1 is made of a material relatively resistant to corrosion such as stainless steel and copper alloy. The shape of the tubular portion 2 of the piping member 1 is
Similar to a normal socket, a tubular taper female screw 5 is provided at both ends of the tubular portion 2.

It should be noted that the tubular member 2 has a shape in which the abutment wall 7 is provided inside the tubular member 2 in the piping member 1 of this embodiment. The contact wall 7 is the tubular portion 2
With respect to the longitudinal direction of, it is provided at the portion located exactly in the center. In other words, the contact wall 7 is provided with the innermost portion of the tapered female screw for pipe 5 as a boundary. Abutment wall 7
Is provided on the inner surface of the tubular portion 2 in an annular shape, and an opening 9 is provided at the center to ensure communication between both ends of the tubular portion 2. The wall surface 10 of the contact wall 7 is perpendicular to the longitudinal centerline of the tubular portion 2. The wall surface 10 of the contact wall 7 is provided with a fitting recess 12. The fitting recess 12 is a groove that is annularly connected over the entire circumference of the abutment wall 7, and its width and depth differ depending on the caliber,
The diameter is 20 A, and both are about 2 to 3 mm.
Since the wall surface 10 of the contact wall 7 is a contact surface with the flange portion 15 as described later, the surface excluding the fitting recess 12 is precisely finished.

On the other hand, the resin core 3 is made of vinyl chloride resin, polyethylene resin or the like as a material, and the tubular portion 13 and the flange portion 15 are integrally molded. The tubular portion 13 of the resin core 3 has the opening 9 of the abutting wall 7 having the inner diameter described above.
It is made almost equal to the diameter of. The outer diameter of the tubular portion 13 is considerably smaller than the inner diameter of the tubular portion 2. The outer peripheral surface 16 of the tubular portion 13 is provided with two rows of protrusions 17 in an annular shape.

The flange portion 15 of the resin core 3 is provided vertically from one end of the tubular portion 13 and has a circular shape. The diameter of the flange portion 15 is equal to the innermost pitch circle of the tapered female thread for pipe 5 of the tubular portion 2. On the outer peripheral surface of the flange portion 15, a pipe taper male screw 18 is provided. A fitting convex portion 20 is provided on the end surface 19 of the flange portion 15, that is, the flange surface.

In the piping member 1 of this embodiment, the resin core 3
Is a taper male screw 18 for pipes provided on the outer peripheral surface of the flange portion 15 fitted with a taper female screw 5 for pipes of the tubular portion 2,
Further, the end surface 19 of the flange portion 15 has the abutting wall 7 of the tubular portion 2.
It is in close contact with. Then, the fitting convex portion 20 of the flange portion 15
Is inserted into the fitting recess 12 of the contact wall 7, and both are integrally fitted. A paste-like sealant (trade name sealant or the like) is applied between the flange portion 15 of the resin core 3 and the contact wall 7 to improve the waterproof property between them.

The tubular portion 13 of the resin core 3 is arranged concentrically with the tubular portion 2, and the outer peripheral surface 16 of the tubular portion 13 and the tubular portion 2 are arranged.
An annular space 22 is formed between the tapered female threads 5 for pipe.

A lining steel pipe 25 is attached to the piping member 1 of this embodiment. The state in which the lining steel pipe 25 is properly attached is as shown in FIG. That is, at the end of the lining steel pipe 25, there is a taper male screw 26 for pipe.
And the taper male screw 26 for pipe is screwed into the taper female screw 5 for pipe of the tubular portion 2. The pipe wall 28 of the lining steel pipe 25 is mounted in the space 22 between the tubular portion 2 and the resin core 3. The ridges 17 provided on the outer peripheral surface 16 of the resin core 3 come into contact with the inner lining 23 of the lining steel pipe 25 so that the portions are closely attached.

Next, the situation when the lining steel pipe 25 is excessively screwed into the pipe member 1 will be described. When the lining steel pipe 25 is excessively screwed into the pipe member 1, the end of the lining steel pipe 25 is reduced in diameter along the taper of the taper female thread 5 of the tubular portion 2. Further, the tip of the lining steel pipe 25 contacts the flange portion 15 of the resin core 3. The resin core 3 is moved toward the center, that is, the arrow C in FIG. 4 by the contraction of the tapered female thread 5 for pipe and the contact with the flange portion 15.
Receive the force to move in the direction.

However, in the piping member 1 of this embodiment,
Since the fitting convex portion 20 of the flange portion 15 is fitted to the fitting concave portion 12 of the contact wall 7, the force in the direction of arrow C received from the lining steel pipe 25 is due to the shearing force applied to the fitting convex portion 20. To be opposed. Therefore, in the piping member 1 of this embodiment,
As shown in FIG. 4, the diameter of the lining steel pipe 25 is reduced to some extent, but the portion outside the fitting protrusion 20 does not move. As a result, the pipe taper male screw 18 on the peripheral surface of the flange portion 15 is formed.
And the adhesiveness of the tubular taper female thread 5 of the tubular portion 2 is maintained.

The above-described method for molding the resin core 3 of the piping member 1 and the means for connecting the resin core 3 and the tubular portion 2 are as follows.
It is not particularly limited and can be arbitrarily selected according to the type of the piping member 1 and the like. A typical example of the molding method of the resin core 3 is a method of simultaneously molding the resin core 3 by injection molding and coupling it to the tubular portion 2. That is, the tubular portion 2 is molded in advance with metal, the tubular portion 2 is mounted in a molding die, and a molding core (core) is placed in the tubular portion. And in this state the tubular portion 2
A molten thermoplastic resin is filled in the inside of the tube, and the resin core 3 is formed on the inner surface of the tubular portion 2.

It is also possible to separately mold the resin core by injection molding or the like and join the both in a subsequent step as shown in FIG. That is, only the resin core 30 is separately molded and screwed into the opening of the tubular portion 2 as shown in FIG. When the resin core 30 is formed in a process different from the molding process and then screwed into the tubular portion 2 as described above,
It is recommended to provide ribs 31 on the inner surface of the resin core 30 as shown in FIG. The rib 31 is formed by the resin core 30.
It functions as an engagement margin of a screwing jig (not shown) when screwing in. In addition, the rib 31 is formed by the resin core 30.
The tubular portion 32 is reinforced to prevent the tubular portion 32 from being deformed when screwed.

In each of the embodiments described above, the contact wall 7 is used.
The fitting concave portion 12 is provided on the flange 15, and the fitting convex portion 2 is provided on the flange portion 15 side.
0 is set. However, instead of this, for example, a configuration in which a fitting convex portion is provided on the contact wall 7 and a fitting concave portion is provided on the flange portion 15 side, or a configuration in which unevenness is provided on both the contact wall 7 and the flange portion 15 for fitting Is also possible. Further, although the fitting concave portion 12 and the fitting convex portion 20 are annularly continuous in the above embodiment, they may be discontinuous ones instead.

Next, another embodiment of the present invention will be described. The same members as those in the previous embodiment are designated by the same reference numerals and detailed description thereof will be omitted. FIG. 6 is an enlarged sectional view of a main part of a piping member according to a specific embodiment of the present invention. FIG. 7 is an enlarged sectional view of an essential part showing a state in which a lining steel pipe is excessively screwed into the piping member of FIG. FIG. 8 is an enlarged sectional view of a main part of a piping member according to a modified example of the present invention. FIG. 9 is an enlarged sectional view of an essential part showing a state in which the lining steel pipe is screwed into the piping member of FIG. 8 with an appropriate fitting amount. FIG. 10 is a cross-sectional view of a molding core used when manufacturing the piping member of FIG. Figure 1
FIG. 1 is an enlarged sectional view of a main part of a piping member according to a modified example of the present invention.

In the above embodiment, the pipe taper male screw 18 is provided on the peripheral surface of the flange portion 15 of the resin core 3, but the pipe taper male screw 18 is not an essential component of the present invention. That is, the contact wall 7 is provided at a position apart from the taper female thread 5 for pipe provided on the tubular portion 2, and the flat flange portion 15 is provided.
It is also possible to bring the peripheral surface of the tube into contact with the tubular portion 2. When adopting such a configuration in which the peripheral surface of the flange portion 15 is made flat, the end portion of the flange portion 15 is folded back into a bag shape to form the folded portion 35 as in the piping member 33 of FIG. It is recommended that the outer peripheral surface 36 of the folded portion 35 is brought into contact with the inner surface of the tubular portion 2. In the configuration in which the bag-shaped folded-back portion 35 is provided at the end portion of the flange portion 15 as shown in FIG. 6, the resin core 3
4 includes not only the end surface 19 of the flange portion 15 but also the folded portion 3
The outer peripheral surface 36 of 5 is also in close contact with the tubular portion 2. Therefore, the adhesion area between the resin core 34 and the tubular portion 2 is large.

As a result, the pipe member 33 of this embodiment has a resin core 34 even if it receives a reducing force from the lining steel pipe 25.
Does not separate from the inner wall of the tubular portion 2. In addition, the space 2 where the pipeline 37 through which water flows and the lining steel pipe 25 are arranged
Even if it goes through between 2 and 10, the flange part 1
5. The turn-back section 35 traces a complicated flow path. Therefore, even if the resin core 34 is slightly separated from the tubular portion 2, the labyrinth effect prevents water from entering the void 22.

When the folding amount of the folding portion 35 is larger than a certain amount, water can be sufficiently prevented from entering without the fitting convex portion 20 of the flange portion 15 and the like.

In the embodiment shown in FIG. 6, the inner surface of the folded portion 35 is flat. However, more preferably, it is recommended that the internal thread 39 that is continuous with the tapered internal thread 5 be provided on the inner surface of the folded portion 35 of the resin core 40, as in the piping member 38 of FIG. 7. According to the configuration as shown in FIG. 7, the tip of the taper male screw 26 for the pipe of the lining steel pipe 25 is fitted with the taper female screw 39 provided on the inner surface of the folded portion 35. Therefore, the inside of the resin core 40 is sealed by the taper female threads 5 and 39 for the pipe and the ridge 17. Since the end surface of the lining steel pipe 25 is arranged in the bag-shaped closed space of the resin core 40, water does not come into contact with the end surface of the lining steel pipe 25. Note that FIG. 7 shows an example in which a lining 57 is provided in the opening 9 of the tubular portion 2.

The piping member 50 shown in FIG. 8 is the same as that shown in FIG.
This embodiment is a further improvement of the embodiment. In the piping member 50 shown in FIG. 8, the portion of the tubular taper female thread 5 of the tubular portion 2 and the tubular taper male thread 56 of the outer periphery of the resin core 53 are fitted, and further, on the inner surface of the folded portion 51 of the resin core 53. A taper female thread 52 for a pipe is provided. The portion where the pipe taper male screw 56 and the pipe taper female screw 52 are provided on both surfaces of the folded portion 51 may have a certain thickness to exert a considerable rigidity, but in many cases, it is a thin film form. is there. More specifically, the part does not have rigidity enough to tighten the lining steel pipe 25 by itself, and is simply a continuous film-shaped film between the pipe taper male screw 26 of the lining steel pipe 25 and the pipe taper female screw 5 of the tubular portion 2. Things are only intervened. Particularly, when the lining steel pipe 25 is screwed in, the resin is crushed between the pipe taper male screw 26 of the lining steel pipe 25 and the pipe taper female screw 5 of the tubular portion 2 as shown in FIG. 9, and the portion becomes extremely thin. I will end up.

However, in the piping member 50 of this embodiment, although the folded portion 51 of the resin core 53 is thin, it is in the state of being fitted with the tapered female screw 5 for pipe of the tubular portion 2.
Even if the lining steel pipe 25 receives a reducing force, the resin core 53 does not easily separate from the tubular portion 2. Further, since a part of the resin core 53 is sandwiched between the lining steel pipe 25 and the pipe taper female screw 5 of the tubular portion 2, at least that portion is not separated from the tubular portion 2. When the configuration of the piping member 50 shown in FIG. 8 is adopted, in most cases, the concavo-convex fitting structure between the contact wall 7 and the flange portion 55 is unnecessary. Further, the contact wall 7 itself may be smaller than that of the configuration of FIG. 1, and may be completely unnecessary.

Referring to the method of manufacturing the piping member 50 of FIG. 8, a molding core 58 (core) as shown in FIG. 10 is mounted in the preformed tubular portion 2 to mold the tubular portion 2 into a mold. And then inject the resin into the remaining voids. Here, the molding core 58 is a tubular member, and a tapered female screw 59 for a pipe is formed on the outer peripheral surface thereof. As the structure peculiar to the molding core 58, the tip portion D of the tapered female thread 59 for pipe has a lower thread height than the other portions E. Therefore, in the D portion, a gap is created between the tubular portion 2 and the molding core 58, the raw material resin wraps around, and a thin film is formed on the surface of the tapered female screw 5 for pipe of the tubular portion 2. The length of the tip portion D of the taper female thread 59 for a pipe is approximately 3 of the total length of the thread.
It is about one-third. Further, it is recommended that the height of the screw thread in the relevant portion is specifically about 20% lower than that in other portions.

In addition to the above-described manufacturing method, the piping member 50 of FIG. 8 is made such that the thread height of the tubular portion 2 is made lower as it goes deeper, or a pipe taper female thread is provided near the entrance of the opening, and the tip portion is By using a parallel female thread for a pipe, it is also possible to provide an appropriate gap with the molding core.

Next, regarding the structure in which the bag-shaped folded-back portion is provided at the end portion of the resin core described above, regarding the folded-back length and the length of the screw portion provided in the tubular portion, where the metal is exposed , Explain its design guidelines. Normally, the length of the screw of the tubular portion 2 of the piping member is set to be considerably longer than the originally required length with a margin. Therefore, in most cases, not all the screws of the tubular portion 2 fit with the screws of the lining steel pipe 25, and the metal screw is exposed at the back side portion. By the way, the above-mentioned piping members 33, 38, 5
According to 0, water is prevented from entering the space 22 between the resin cores 34, 40, 53 and the tubular portion 2, but there is a possibility that water may enter the portion due to an accidental reason. Cannot be denied.

If water enters the portion, water will come into contact with the metal surface of the screw of the tubular portion 2. Here, when cast iron or cast steel is used as the material of the tubular portion 2, rust occurs in the screw portion, which causes red water.
Therefore, when cast iron or cast steel is used as the material of the tubular portion 2, consideration should be given to minimizing the exposed metal portion of the screw portion.

Ideally, it is desirable to cover the surface of the screw of the tubular portion 2 with the folded portion of the resin core, as in the piping member 50 of FIGS. Further, in the case of other configurations, it is desirable that the screw of the tubular portion 2 is provided for the minimum necessary length L as shown in FIG. 11, and the other portion is covered with the folded portion 35 of the resin core 34. Here, the minimum required length L of the screw of the tubular portion 2 is specified in JISB0203. Therefore, it is recommended that the length of the screw of the tubular portion 2 be the length of the standard mentioned above or a little longer than that.

It should be noted that cast iron or the like is used as the material of the piping member 50,
Further, in consideration of prevention of rusting of the exposed portion of the screw as described above, it is inevitable that a resin lining 57 as shown in FIG. 11 is applied to the inner surface of the frontage 9 which serves as the flow passage of the piping member. Is.

Next, an embodiment of the invention described in claim 3 will be described. FIG. 12 is an enlarged sectional view of a main part of a piping member according to a specific embodiment of the present invention. FIG. 13 is an enlarged sectional view of an essential part showing a process of assembling a piping member according to a modified example of the present invention. FIG. 14 is an enlarged sectional view of a main part of a piping member according to a modified example of the present invention. FIG. 15 is an enlarged sectional view of a main part of a piping member according to another modified example of the present invention.

The piping member 60 shown in FIG. 12 is one of the embodiments of the present invention, and uses a sealing material 61 to prevent water from entering. That is, in the piping member 60 of this embodiment,
An annular recessed groove 63 is provided in the contact wall 62 of the tubular portion 2. Further, the end surface of the flange portion 66 of the resin core 65, which is opposed thereto, is smooth. A sealing material 61 using an elastic O-ring is arranged in the concave groove 63 of the contact wall 62, and the sealing material 61 is in close contact with the concave groove 63 and the end surface of the flange portion 66.

Here, the material of the sealing material 61 is not particularly limited, and a material having excellent elasticity such as butyl rubber or urethane is usually used. Especially, in the piping member 60 of this embodiment, the sealing material 61 is A material made of water-swellable rubber or resin is desirable. Here, the water-swellable rubber or resin is a rubber or resin that has the property of increasing its volume when exposed to water.

In the piping member 60 of this embodiment, even if the diameter of the lining steel pipe 25 is reduced and the resin core 65 is moved or deformed in the center direction (F direction), the flange portion 66 of the resin core 65 is considerable. Because it has an area, the flange 6
Any part of the end surface of 6 always contacts the sealing material 61. Therefore, even if the resin core 65 moves slightly toward the center (F direction), the watertightness is ensured at the seal member 61.

Even if the resin core 65 moves away from the abutment wall 62 due to the diameter reduction of the lining steel pipe 25 or other reasons, the watertightness is not impaired. That is, in the piping member 60 of this embodiment, since the elastic material is selected as the sealing material 61, the flange portion 66 is used.
When is moved in the axial direction, the sealing material 61 is restored to maintain watertightness. If a water-expandable rubber or resin is used as the material of the seal material 61, the seal material 61 expands when it is exposed to water. Therefore, the contact between the end surface of the flange portion 66 and the sealing material 61 is further strengthened, and complete waterproofing is secured.

In the piping member 60 of this embodiment, the sealing material 6
1 is mounted between the contact wall 62 and the flange portion 66,
In many cases, the resin core 65 is usually molded separately and then mounted on the tubular portion 2 in a later step. Therefore, it is recommended to provide the rib 70 on the inner surface of the resinous core 65 as in the embodiment of FIG. 5 (see FIG. 13).

In the piping member 60 shown in FIGS. 12 and 13, the contact wall 62 of the tubular portion 2 is provided with a concave groove 63, and the sealing material 61 is arranged in the concave groove 63. But of course, as shown in Figure 14,
An annular groove 71 is provided on the flange portion 73, and the groove 71
The sealing material 61 may be arranged inside. In addition, the sealing material 61
Is not limited to the O-ring, and a sheet-shaped one can be used.

FIG. 15 shows an example in which cast iron or cast steel is used as the material of the tubular portion 2, and the flow passage of the tubular portion 2 and the contact wall 62 are provided with a lining 72. In this embodiment, the lining 72 is provided not only in the opening 2 of the tubular portion 2 but also on the contact wall 7. And the sealing material 67
Is in contact with the lining 72 on the surface of the contact wall 7.

Although all of the above-mentioned embodiments have been described by taking the socket as an example, the piping member of the present invention is not limited to the socket and can be applied to elbows, tees and other pipe joints. . Furthermore, the piping member of the present invention can be applied to a piping accessory material such as a valve, a strainer and a check valve. FIG. 16 shows a mode in which the configuration described in FIG. 1 is applied to a valve. FIG.
In the valve 80, the wall 82 of the valve chamber into which the valve body 81 of the sluice valve is inserted is used as the contact wall. An annular fitting concave portion is provided on the outer surface of the wall 82 of the valve chamber, and the fitting convex portion of the flange portion of the resin core 83 is fitted into the concave portion.

[0051]

In the piping member according to the first aspect of the present invention, the tubular portion has an abutment wall on the inner surface thereof, and the abutment wall is provided with a fitting portion so that a part of the flange portion of the resin core contacts. It is fitted with the wall. Therefore, when the pipe such as the lining steel pipe is excessively screwed and the resin core receives a force toward the center due to the diameter reduction of the pipe, the force toward the center is generated by the fitting portion provided on the contact wall. Supported. Therefore, in the piping member of the present invention, even if the lining steel pipe or the like is excessively screwed, the resin core does not separate from the inner surface of the tubular portion, and water does not enter around the end portion of the lining steel pipe or the like. Therefore, the piping member of the present invention has an excellent effect that red water due to rust is not generated.

Further, the pipe member of the present invention ensures the watertightness around the end portion of the lining steel pipe or the like even if there is a slight excess of screwing in, so that there is an effect that no skill is required for pipe construction.

In the piping member according to the second aspect, the resin core has a folded portion folded back in a bag shape at its end, and the outer peripheral surface of this folded portion is in contact with the inner surface of the tubular portion. Therefore, in the piping member according to the second aspect, the contact area between the resin core and the piping member is large, and the resin core is less likely to peel off even when a force is applied from the lining steel pipe or the like. Therefore, claim 2
In the described piping member, water does not come into contact with the end portion of the lining steel pipe or the like, which has an effect of preventing the generation of red water.

Further, in the piping member according to the present invention, since the resin core has the flange portion, and the flange portion is in contact with the contact wall of the tubular portion via the sealing material, the lining steel pipe is provided. Even if the resin core moves a little due to the reduced diameter, the hermeticity around the end of the lining steel pipe is maintained. As a result, the piping member according to the third aspect has an excellent effect that does not cause generation of red water even if piping such as a lining steel pipe is excessively screwed.

[Brief description of drawings]

FIG. 1 is a sectional view of a piping member according to a specific embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is an enlarged sectional view of an essential part showing a state in which a lining steel pipe is screwed into the pipe member of FIG. 1 with an appropriate fitting amount.

FIG. 4 is an enlarged cross-sectional view of an essential part showing a state where a lining steel pipe is excessively screwed into the piping member of FIG.

FIG. 5 is an enlarged sectional view of an essential part showing an assembling process of a piping member according to a modified embodiment of the present invention.

FIG. 6 is an enlarged cross-sectional view of a main part of a piping member according to a specific example of the present invention.

7 is an enlarged sectional view of an essential part showing a state where a lining steel pipe is excessively screwed into the piping member of FIG.

FIG. 8 is an enlarged sectional view of an essential part of a piping member according to a modified example of the present invention.

9 is an enlarged sectional view of an essential part showing a state in which a lining steel pipe is screwed into the piping member of FIG. 8 with an appropriate fitting amount.

10 is a cross-sectional view of a molding core used when manufacturing the piping member of FIG.

FIG. 11 is an enlarged sectional view of an essential part of a piping member according to a modified example of the present invention.

FIG. 12 is an enlarged cross-sectional view of a main part of a piping member according to a specific example of the present invention.

FIG. 13 is an enlarged cross-sectional view of a main part showing a process of assembling a piping member according to a modified example of the present invention.

FIG. 14 is an enlarged cross-sectional view of a main part of a piping member according to a modified example of the present invention.

FIG. 15 is an enlarged sectional view of an essential part of a piping member according to another modified example of the present invention.

FIG. 16 is a cross-sectional view of a piping member according to a modified example of the present invention.

FIG. 17 is an enlarged sectional view of a main part of a conventional piping member.

FIG. 18 is an enlarged sectional view of an essential part showing a state in which a lining steel pipe is excessively screwed into a conventional piping member.

[Explanation of symbols]

 1, 33, 38, 50, 60 Piping member 2 Tubular part 3, 30, 34, 40, 53 Resin core 65, 83 Resin core 5, 39, 52, 59 Pipe taper female screw 7,62 Abutment wall 12 Fitting Mating recess 15,55,66,73 Flange 18,26 Pipe taper male screw 20 Fitting protrusion 25 Lining steel pipe 35,51 Folding portion 61 Sealing material

Claims (3)

[Claims] 1. In a pipe member in which a resin core is provided inside a tubular portion provided with an internal thread, and an end of a pipe is inserted between the internal screw and the resin core, the tubular portion abuts an inner surface. A wall, a fitting portion is provided on the contact wall, the resin core has a flange portion, the flange portion contacts the contact wall, and a part of the flange portion contacts. A piping member fitted with a fitting portion provided on a wall. 2. In a pipe member in which a resin core is provided inside a tubular portion provided with an inner screw, and an end portion of a pipe is inserted between the inner screw and the resin core, the resin core has an end portion. A pipe member, characterized in that it has a folded portion folded back into a bag shape, and the outer peripheral surface of the folded portion is in contact with the inner surface of the tubular portion. 3. In a pipe member in which a resin core is internally provided in a tubular portion provided with an internal screw, and an end portion of the pipe is inserted between the internal screw and the resin core, the tubular portion contacts an inner surface. A pipe member having a wall, a resin core having a flange portion, and the flange portion being in contact with the contact wall via a sealing material.