JP2001263559A - Pipe joint, its manufacturing device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint preventing a joint body from being expanded even in receiving an internal pressure by fluid, preventing unfavorable load from applying to a pipe by generating a large reaction, and preventing such troubles as falling off a connecting flange and being narrow in the use temperature range. SOLUTION: This pipe joint is so formed that an annular reinforcing material is buried inside a hollow cylindrical joint body formed of an elastic material and the reinforcing material is supported by a support rod detachably mounted in the axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for connecting a pipe for fluid flow.

[0002]

2. Description of the Related Art A conventional pipe joint of this type comprises a joint body in which a plurality of reinforcing layers made of rubber and a synthetic resin for increasing pressure resistance are laminated, and connection flanges are attached to both openings. It has become.

[0003]

However, in such a structure, when an internal pressure due to a fluid is applied to the joint body, a large reaction force is generated due to the property that the joint body expands and expands. In addition, the connecting flanges fall off, and the reinforcing layer is vulnerable to high temperatures.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the conventional pipe joint, and to prevent the joint body from expanding even when an internal pressure due to fluid is applied to the joint body.
No undesired load is applied to the piping due to a large reaction force, and the connection flange may fall off,
An object of the present invention is to provide a pipe joint that does not have a narrow operating temperature range.

[0005]

According to the present invention, in order to achieve the above object, a pipe joint according to the first aspect of the present invention is provided in a hollow cylindrical joint body made of an elastic material. An annular reinforcing member is embedded, and the reinforcing member is supported by a support rod which is detachably mounted in the axial direction.

According to a second aspect of the present invention, in the pipe joint, a through hole is provided in the reinforcing member, and a support rod is inserted into the through hole.

According to a third aspect of the present invention, the support rod has one end screwed into a screw hole provided in one of the flanges buried inside both side surfaces of the joint body. It is characterized in that it also serves as an axial extension stopping member.

The invention according to claim 4 is characterized in that the flange is provided with a screw hole for connecting another connecting member.

According to a fifth aspect of the present invention, there is provided an apparatus for manufacturing a pipe joint, comprising: a pair of side plates, a tubular body disposed between the two side plates, and an inner surface of one of the side plates. The distal end has a cylindrical core that engages with the inner surface of the other side plate, and a molding space is formed by the inner surfaces of the two side plates and the cylindrical body and the outer surface of the core metal. The present invention is characterized in that it comprises a mold in which a flange set pin and a reinforcing member set pin are detachably mounted.

According to a sixth aspect of the present invention, the metal core is constituted by first and second metal core members whose base ends are detachably connected to both side plates. An arch-shaped rubber ring is fitted.

According to a seventh aspect of the present invention, there is provided a method of manufacturing a pipe joint, wherein a flange is held at a predetermined position by a flange set pin attached to both side plates, and a reinforcing material is held at a predetermined position by a reinforcing material set pin. Attach a metal core between the inner surfaces of the plates, cover the flange and the reinforcing material arranged between the two side plates, arrange the tubular body, and make both ends abut the inner surfaces of the both side plates, A molding space is formed between the cylindrical body and the core metal, the mold is closed, synthetic rubber is injected into the molding space to form a pipe joint, and then the mold is opened.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in the drawings, FIGS. 1 and 2 show a first embodiment of the invention of a pipe joint. This pipe joint is made of an elastic material such as synthetic rubber. The joint body 1 has a hollow cylindrical shape, and a connection flange 2-
The connection flanges 2-1 and 2-2 are respectively provided with a plurality of (four in this embodiment) screw holes 3;
It has a stepped hole 5 located on the same circumference as the screw hole 3 and in the middle thereof, and the screw hole 3 and the stepped hole 5 communicate with the outside. A hard annular reinforcing member 6 made of a metal plate or the like is embedded in the joint body 1 between the connection flanges 2-1 and 2-2.

The reinforcing member 6 is provided with a through hole 4, and a supporting rod 7 buried in the through hole 4 in the axial direction penetrates and supports the reinforcing member 6. The support rod 7 is formed of a screw rod, and the head and the screw part at the tip are housed in the stepped hole 5, and the screw part is screwed to the nut 8 in the stepped hole 5 of one flange 2-2. The support rod 7 is thus
The head and the nut 8 also serve as an extension stopping member for suppressing the extension of the joint body 1 in the axial direction.

FIG. 3 shows a mold 10 according to the invention of a pipe joint manufacturing apparatus.
FIG. 4 shows a cross section of the assembled state of the embodiment of FIG.
Reference numeral 10 denotes a pair of side plates 11-1 and 11; a tubular body 12 disposed between the side plates 11-1 and 11-1; and a protruding portion provided on the inner surface of one side plate 11-1; A cylindrical core 13 is engaged with the inner surface of the base 11-2, and the core 13 is detachably attached to the side plate 11-1 by a set screw 17. And side plate 11-
A space 20 for molding the joint body 1 is formed by the components 1 and 2, the cylindrical body 12 and the metal core 13. Flange 2 is attached to both side plates 11-1 and 11-2.
Flange set pins 14 having screw portions 23 to be screwed into the stepped holes 5 of -1 and 2 are detachably attached.

Reinforcing member set pins 16 each having a tip fitted into the through hole 4 of the reinforcing member 6 which is set in the space 20 when the joint body 1 is molded, are set on both side plates 11-1 and 11-1 by set screws 15. It is detachably screwed. The metal core 13 is constituted by first and second metal core members 24-1 and 24-2 which are detachably fitted. An arch-shaped rubber ring 18 is provided at the joint between the metal core members 24-1 and 24-2. Are fitted, 19 is a rubber injection hole, 21 is a guide pin, and 27 is an air vent. In this embodiment, as shown in FIG. 2, since there is one arch 25 in the joint main body 1, one rubber ring 18 is used.
If the number of arches 25 increases according to the length of the joint body 1, it goes without saying that the number of rubber rings 18 also increases.

To assemble the mold 10 when molding the pipe joint of the present invention by using the mold 10, first, the flange set pin 14 is inserted into the mounting hole of the side plates 11-1 and 11-2, The screw portion 23 at the tip of the flange set pin 14 is screwed into the screw hole 3 of 2-1 and 2-2, and the flange 2-1 and
2 is attached to both side plates 11-1 and 11-2. Next, the reinforcing member set pins 16-1 and 16-2 are attached to both side plates 11-1 and 11-2. When attaching the reinforcing member set pins 16-1 and 16-1, the heads of the reinforcing member set pins 16-1 and 16-1 are attached to the side plates 11-1 and 11-1.
2 is inserted into the mounting hole 2, and the front end is inserted into the through hole 4 of the flanges 2-1, 2 and fixed to the side plates 11-1, 1-2 with set screws 15. Next, when attaching the metal core 13 to the side plate 11-1, the base end surface of the metal core member 24-1 is brought into contact with the inner surface of the flange 2-1. Attach to both side plates 11-1 and 11-2. Next, the support ring 28, the rubber ring 18, the support ring 29, and the core metal member 24-2 are sequentially fitted from the tip of the core metal member 24-1. The support rings 28 and 29 used at this time are
Since the lower rim of the surface that abuts on 1 and 2 is formed on the outwardly inclined surface 31, air can be removed smoothly.

In the above-mentioned structure, one side plate is provided.
The through hole 4 of the reinforcing member 6 is attached to the tip of the reinforcing member set pin 16-1 by fitting the through hole 4 of the reinforcing member 6 to the reinforcing member 11-1. The material set pin 16-2 is fitted into the through hole 4 of the reinforcing material 6, thus stabilizing the reinforcing material 6 at a predetermined position, and the tip of the core bar 13 is fitted into the annular groove 22 of the side plate 11-2. I do. And by fitting the tubular body 12 to such a structure,
The mold 10 in the state shown in FIG. 3 is assembled.

When the joint of the present invention is manufactured by the manufacturing apparatus equipped with such a mold, a rubber material is injected into the space 20 from the injection hole 19, and the reinforcing material 6 is used as described above. It is stably held at a predetermined position by the reinforcing member set pins 16-1 and 16-2. After the completion of the product through a vulcanization process, the flange set pin 14 is
Remove the set screws 16-1 and 16-2, and remove the set screw 15 and remove the reinforcing member set pins 16-1 and 16-2. The through hole 9 shown in FIG. 1 formed by removing the reinforcing material set pins 16-1 and 16-2.
Then, a nut 8 is screwed into a threaded portion located in the stepped hole 5 at the tip end of the supporting rod 7 to obtain a completed pipe joint.

When connecting to a piping for fluid distribution (not shown) by using such a pipe joint, a connecting flange of the pipe is brought into contact with both side plates 11-1 and 11-2, and a connecting bolt is connected to the flange. Then, by screwing into the screw holes 3 of the flanges 2-1 and 2 through this through hole, this pipe joint is connected to the pipes to connect the pipes.

Since the pipe joint of the present invention connected to the pipe in this way is made of elastic rubber, the pipe joint may be extended in the axial direction by the internal pressure of the fluid flowing inside. The support rod 7 can be prevented from extending against the internal pressure. Further, when the support rod 7 is aged or a larger internal pressure is applied, a stronger support rod 7 can be used. You can exchange and prepare for it.

[0021]

The present invention is as described above, and in the pipe joint according to the first aspect of the present invention, an annular reinforcing member is embedded inside a hollow cylindrical joint body made of an elastic material. The reinforcing member is supported by a support rod detachably mounted in the axial direction. According to the invention described in claim 2, the reinforcing member is provided with a through hole, and the support rod is inserted into the through hole. Yes,
According to a third aspect of the present invention, the support rod has one end screwed into a screw hole provided in one of the flanges buried inside both side surfaces of the joint main body, and the support rod extends in the axial direction of the joint main body. Since it also serves as an extension stop member, the pipes are connected by a simple operation of screwing a bolt into the screw hole of the connection flange, and even if internal pressure due to the fluid flowing inside is applied, the reinforcement material will remove the elastic material from the elastic material. Since the entire joint body does not extend or expand and is entirely covered with an elastic material, the joint body serves as a gasket at the time of connection and has an effect that the operating temperature range is wide.

According to a fifth aspect of the present invention, there is provided an apparatus for manufacturing a pipe joint, comprising: a pair of side plates; a tubular body disposed between the two side plates; A tip has a cylindrical core engaged with the inner surface of the other side plate, and a molding space is formed by the inner surfaces of the side plates and the cylindrical body and the outer surface of the core, and a plurality of flanges are formed on the both plates. The present invention according to claim 6, further comprising a mold to which the set pin and the reinforcing material set pin are detachably mounted, wherein the core has a base end detachably connected to both side plates. An arch-shaped rubber ring is fitted to the joint between the two core members, so that the flange and the reinforcing material are not displaced at the time of rubber injection, and are accurately positioned at a predetermined position. There is an effect that it can be held.

According to a seventh aspect of the present invention, there is provided a method of manufacturing a pipe joint, wherein a flange is held at a predetermined position by a flange set pin attached to both side plates, and a reinforcing member is held at a predetermined position by a reinforcing member set pin. Attach a metal core between the inner surfaces of the plates, cover the flange and reinforcing material arranged between the two side plates, arrange the tubular body, and make both ends abut the inner surfaces of both side plates, A molding space is formed between the cylindrical body and the core bar, the mold is closed, synthetic rubber is injected into this molding space to form a pipe joint, and then the mold is opened. There is an effect that the material can be accurately positioned at a predetermined position, and the product can be easily cut out.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of a pipe joint according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 in FIG.

FIG. 3 is a longitudinal sectional view of a mold of the manufacturing apparatus of the present invention.

FIG. 4 is an exploded configuration diagram of the core metal.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Joint main body 2-1 and 2 Flange 3 Screw hole 4 Through-hole 6 Reinforcement 7 Support rod 8 Nut 10 Die 11-1 and 2 Side plate 12 Cylindrical body 13 Core metal 14 Flange set pin 15 Set screw 16-1, 2 Reinforcement set pin 17 Set screw 18 Rubber ring 19 Injection hole 20 Space 21 Guide pin 22 Annular groove 23 Screw part 24-1, 2nd
2-core metal member 25 Arch 27 Air vent 28 Support ring 29 Support ring 31 Inclined surface

Claims (7)

[Claims] An annular reinforcing member is buried inside a hollow cylindrical joint body made of an elastic material, and the reinforcing member is supported by a support rod detachably mounted in an axial direction. Pipe fittings. 2. The reinforcing member is provided with a through-hole, and a support rod is inserted into the through-hole.
The pipe joint according to 1. 3. The support rod has one end screwed into a threaded hole provided in one of the flanges embedded in both side surfaces of the joint main body, and a member for stopping the axial extension of the joint main body. The pipe joint according to claim 1, which also serves as a pipe joint. 4. The pipe joint according to claim 1, wherein the flange is provided with a screw hole for connecting another connecting member. 5. A pair of side plates, a cylindrical body disposed between the two side plates, and a cylindrical core protruding from an inner surface of one of the side plates and having a tip engaged with an inner surface of the other side plate. A molding space is formed by the inner surfaces of the both side plates and the cylindrical body and the outer surface of the core bar, and a plurality of flange set pins and reinforcing member set pins are detachably mounted on both side plates. A pipe joint manufacturing apparatus comprising a mold. 6. A metal core is constituted by first and second metal core members whose base ends are detachably connected to both side plates, and an arch-shaped rubber ring is coated on a joint between the metal core members. The pipe joint manufacturing apparatus according to claim 5, wherein the fitting is fitted. 7. A flange is held in a predetermined position by a flange set pin attached to both side plates, and a reinforcing material is held in a predetermined position by a reinforcing material set pin, and a core is attached between inner surfaces of both side plates. The cylindrical body is arranged by enclosing the flange and the reinforcing material, and both ends thereof are brought into contact with the inner surfaces of both side plates,
A pipe characterized by forming a molding space between both side plates, a cylindrical body and a core metal, closing the mold, injecting synthetic rubber into the molding space to form a pipe joint, and then opening the mold. Manufacturing method of joints.