JPH09196257A - Piping joint device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate short time connection between pipings and to effectively absorbing vibrations after connection. SOLUTION: Projection parts 21b and 22b are formed in the vicinity of the end parts of pipings 21 and 22 connected by being butted against each other. The projection parts 21b and 22b are projectively provided in approximately annular forms toward an outer peripheral sides. A connection ring 24 made of an elastic material is fixed in an outer peripheral surface between the projection parts 21b and 22b. A sealing part 24b protruded in a dual form is projectively provided in the inner periphery of the connection ring 24. The projection parts 21b and 22b and the connection ring 24 are housed and fixed in a recessed part 35 formed in a joint 31. The joint 31 is capable of turning one end of each of a pair of housings 33 and 34 formed by dividing a cylindrical body into two parts and fasten and fix the other end by a bolt 55.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint device used for air conditioning pipes, sanitary pipes, fire hydrant pipes and the like in various facilities such as construction, civil engineering, water supply, plants, machines, shipbuilding, mines and the like.

[0002]

2. Description of the Related Art Conventionally, when laying pipes in various types of equipment, when connecting pipes in a butted state,
As shown in FIGS. 5 and 6, the method of welding the entire circumference of the connection ends of the pipe 1 and the pipe 2, and the pipe 3 and the pipe provided with the concave grooves 3a and 4a as shown in FIGS. 7 and 8. The method of integrally connecting the connecting ends with the pipe joint device 5 with the pipe joint device 5 is generally used.

As shown in FIGS. 5 and 6, the method of welding the entire circumferences of the connecting ends of the pipe 1 and the pipe 2 requires a high level of welding technique, which requires a long working time. Have Further, in the vicinity of the welded portion 7 and the connection portion 7, the surface of the galvanized steel material is melted by the welding, so that it is necessary to apply rust prevention treatment (painting) 8 after the welding such as brush coating. In this case, the pipe 1,
Although it is possible to apply rustproofing treatment 8 to the surface of No. 2, as shown in FIG. 6, rustproofing treatment is applied to the surface of the steel skin 9 melted by the welding heat inside the pipes 1 and 2. In addition, there is a problem that the spatter 10 enters the inside of the pipes 1 and 2 at the time of welding, and this causes the pipe to be clogged during use. Further, since the pipes 1 and 2 are fixed by welding, the pipes 1 and 2 cannot be partially removed at the time of maintenance, and there is a problem that the maintenance work is limited.

On the other hand, the joint construction method shown in FIGS.
First, the grooves 3a and 4a are formed on the entire circumference of the pipes 3 and 4 near the connection ends by a roll pressing machine (not shown).
Further, the rubber ring 12 is fitted to the outer periphery of the central portion between the connecting ends of the pipes 3 and 4. That is, first, one pipe 3
The connection end portion of (1) is fitted into the rubber ring 12 up to a half position in the axial direction. Next, by fitting the connection end of the other pipe 2 into the rubber ring 12 from the opposite side, the rubber ring 12 is attached to the outer periphery of the central portion between the connection ends of the pipes 3 and 4 as shown in FIG. Mating. Next, a pair of arc-shaped housings 14 and 15 which are cast products in which the annular body is divided into two,
It is attached to the outer circumference between these connecting ends. Further, concave grooves 14a, 15a for accommodating the rubber ring 12 are formed on the inner circumferences of the arc-shaped housings 14, 15, and the concave grooves 14a are also formed.
, 15a are formed with a pair of claws 14b, 15b on both side edges, and these pair of claws 14a, 15b are mounted on the outer circumference between the connection ends.
Grooves 3a and 4a in which 14a and 15a are formed in pipes 3 and 4, respectively
Is engaged inside. And these arc-shaped housings
After mounting 14, 15 in place, each arcuate housing 1
Flange 14c provided at both ends of 4 and 15 in the circumferential direction
, 15c are tightened with bolts 16 and nuts 17 so that they are integrally connected.

However, in the joint construction method shown in FIGS. 7 and 8, when a large vibration occurs in the pipes 3 and 4 in the assembled state after the pipes are connected, the pipe joint device 5 is in contact with the pipes 3 and 4. Since the portions are only the claws 14b and 15b engaged with the concave grooves 3a and 4a, there is a problem that it is substantially difficult to absorb the vibration only by the claws 14b and 15b. In addition, the cost of the groove processing machine that forms the grooves 3a and 4a in the pipes 3 and 4 is high, which imposes a heavy burden on the installer, and the housings 14 and 15 themselves, which are cast products, are also expensive. There is a problem that causes the cost increase.
Furthermore, when fitting the rubber ring 12 to the pipes 3 and 4, it is complicated to confirm that the rubber ring 12 is located at the central portion between the connecting ends of the pipes 3 and 4, and When installing the housings 14 and 15, the concave grooves 3a and 4a are
Since it cannot be formed more than the wall thickness dimension of 4, the depth dimension is likely to be shallow, and it becomes difficult to align by engaging the claws 14b and 15b. Further, when connecting these housings 14 and 15, the bolt 16 and There is a problem that the work is complicated and requires a lot of work time, such as the need for two tightening points with the nut 17.

[0006]

As described above, the method of connecting the pipes 1 and 2 by welding requires a high level of welding technology, requires a long working time, and is rustproof (painted) after welding. There is a problem that needs to be applied. Further, the inside of the pipes 1 and 2 cannot be subjected to rust preventive treatment, and there is a problem that the spatter 10 that has entered during welding causes pipe clogging. Furthermore, there is a problem that the pipes 1 and 2 cannot be partially removed during maintenance, which limits the maintenance work. On the other hand, the conventional method using the pipe joint device 5 has problems that it is difficult to absorb vibrations, it is difficult to reduce the cost, the assembling operation is complicated, and a lot of working time is required.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pipe joint device which can easily and reliably connect pipes to each other in a short time and also facilitates disassembly and maintenance.

[0008]

According to a first aspect of the present invention, there is provided a pipe joint device, which comprises a ridge portion formed along the circumferential direction on an outer periphery of each pipe in the vicinity of each connection end of the pipes to be butt-connected to each other.
A connecting ring provided with a seal portion that elastically adheres to the outer peripheral surface between the ridge portions of the pipe, and a pair of one end rotatably connected to each other and the other end connected to each other by a fastener so that they can be clamped and fixed to each other. And a fitting provided with a recessed portion capable of accommodating each of the protrusions and the connection ring, and an extended portion extended along the outer peripheral surface of each of the pipes. It is equipped.

In this structure, the connecting ring is fitted to the connecting end side of each protruding portion of the pair of pipes to be connected, and the seal portion is elastically brought into close contact with the outer peripheral surface. continue,
A joint tool in which a pair of housings are opened with one end as a rotation axis is put on the outer periphery of each pipe in the vicinity of each connection end, the housings are closed, and the other ends are fastened and fixed by a fastening tool. In this state, the protrusions are housed in the recess of the fitting, the pipes are firmly connected to each other, the connection ring is housed in the recess of the fitting, and the connecting portion is reliably sealed. . Further, in this state, the extension portion extending along the outer peripheral surface of each pipe prevents the pipe from coming off or falling off when subjected to vibration. In addition, by loosening the fastener and opening the housing of the fitting, the connected pipes can be separated from each other, and the inside of the pipe can be maintained.

The pipe joint device according to a second aspect of the present invention is the first aspect.
In the pipe joint device described above, the seal portion of the connection ring includes a pair of first seal portions that are in close contact with each pipe and a pair that are in close contact with the connection end side of each pipe with respect to the first seal portions. A second seal portion formed and a positioning portion facing the connection end are provided, and a core material is embedded in at least one of the first and second seal portions.

Further, in this structure, the connecting portion between the pipes is reliably sealed by duplication of the seal by the first and second seal portions and the improvement of the strength by the core material embedded in one of the seal portions. It Further, the fitting position of the connection ring is easily confirmed by the positioning portion provided so as to face the connection end, and the work is facilitated.

A pipe joint device according to a third aspect of the present invention is the first aspect of the present invention.
Alternatively, in the pipe joint device according to 2, the housing is
It is formed by hot forging.

In this structure, since the housing is formed by hot forging, the strength against impact is improved and the weight can be reduced as compared with casting.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a pipe joint device of the present invention will be described below with reference to the drawings.

In FIG. 1 and FIG. 2, 21 and 22 are pipes that are butt-connected to each other, and these pipes 21 and 22 are galvanized steel pipes, and each connection end that is butt-connected.
On the outer peripheries near 21a and 22a, there are formed ridges 21b and 22b whose longitudinal directions are along the circumferential direction, respectively.
And these ridges 21b and 22b are connected to each connection end 21a and 22b.
It is formed in a circular arc shape divided into a plurality of parts such as four or three at a position spaced apart from a by a certain distance so as to project in a substantially U-shaped cross section toward the outer peripheral side, or piping. It is formed in an annular shape over the entire circumference of 21 and 22.

Further, 24 is a connecting ring, and this connecting ring
Reference numeral 24 is a portion fitted in the vicinity of the connection ends 21a and 22a of the pipes 21 and 22, and is made of an elastic material such as rubber, and is formed in a substantially cylindrical base portion 24a, and is provided on the inner peripheral side of the base portion 24a so as to project. The seal portion 24b and the positioning portion 24c thus formed are integrally formed. The seal portion 24b is composed of a pair of first seal portions 24d, 24d projecting from the both ends of the base portion 24a in the axial direction to the inner peripheral side, and the inside of the first seal portions 24d, 24d. A pair of second seal portions 24 located in the
e, 24e, and a steel bead wire 26 is embedded in each first seal portion 24d. The positioning portion 24c has a chevron cross section, and is annularly projected at the center of the base portion 24a in the axial direction.

Furthermore, 31 is a fitting, and this fitting 31 is
A pair of housings 3 divided into two semicircular sections
Combining 3 and 34, connecting ends 21a and 22a of pipes 21 and 22
It has a cylindrical shape that can be fitted to the outer periphery in the vicinity. Then, a recessed portion 35 that is recessed from the inner peripheral side toward the outer peripheral side is formed at the central portion in the axial direction of the joint fitting 31, and the projection of the pipes 21, 22 is formed in the recessed portion 35. The parts 21b and 22b and the connecting ring 24 fitted between the ridges 21b and 22b are accommodated.

Further, the fitting 31 includes the housings 33, 34.
Cylindrical extending portions 37, 37 continuous with the recessed portion 35 and extending along the axial direction are formed. These extended portions 37 are formed on the outer peripheral surfaces of the pipes 21 and 22 by the protruding portions 21b and 22b.
2 along the axial direction so as to surround the base end side from b
It is formed with a length of 0 to 40 mm.

Further, at one end along the circumferential direction of the pair of housings 33, 34, there is provided a rotary connecting portion 41 for rotatably connecting the housings 33, 34 to each other. And
The pivotal connecting portion 41 includes one protruding piece portion 42 provided with a hole in one housing 33 and two protruding piece portions 43, 43 provided with a hole in the other housing 34. A long shaft bolt 45 is inserted between the holes of the projecting piece portions 42, 43, 43 which are combined with each other, and a nut 46 is screwed into the tip end portion of the projecting piece portions 42, 43, 43 so that they can be rotatably coupled to each other and the housing 33 and 34 are connected so that they can be opened and closed.

At the other ends of the housings 33, 34 along the circumferential direction, a fastening portion 51 for fastening the housings 33, 34 to each other and holding them in a tubular state is provided. The fastening portion 51 has horizontal projecting pieces 52 and 53 provided in the housings 33 and 34, respectively, and a fastening tool is formed between the holes of the projecting piece portions 52 and 53. Bolt 55 that penetrates and nut 56 is screwed to the tip,
52, 53 are connected in close contact with each other, and housing 33,
34 is designed to be held closed.

In the above structure, when the pipes 21 and 22 are butt-connected to each other, first, the pipe 2 to be connected is to be connected.
At a predetermined position on the outer peripheral surface near the connecting ends 21a and 22a of 1, 22
A ring-shaped or arc-shaped ridge 21b is previously formed along the circumferential direction.
22b are formed respectively.

Next, a connecting ring 24 made of an elastic material is fitted on the outer circumference of the connecting end 21a of the one pipe 21. At this time,
Since the axial dimension of the connection ring 24 is set within the interval between the ridges 21b, 22b of the pipes 21, 22 that are abutted in the connected state, one end of the connection ring 24 has a ridge. The connecting ring 24 can be mounted at an appropriate position by pushing it in until it comes into contact with the side edge of the portion 21b. Furthermore, since the positioning portion 24c formed in the axial center portion of the connection ring 24 is aligned with the connection end 21a of the pipe 21 in a state where the connection ring 24 is mounted at an appropriate position, the operator is Connection end of positioning part 24c and pipe 21
Due to the positional relationship with 21a, it is possible to easily visually confirm that the connecting ring 24 has been fitted in an appropriate position. Subsequently, the other side of the connecting ring 24 is fitted with the other pipe 22, and the side of the protruding portion 22b of the pipe 22 is brought into contact with the other side of the connecting ring 24, whereby the connecting ring 24 is positioned. The portion 24c is the connection end 21a of the pipes 21, 22.
It is mounted at an appropriate position between the two ribs 21b and 22b located in the center between the 22a.

Further, with the connection ring 24 thus fitted, the sealing portion 24b protrudingly provided on the inner peripheral side of the connection ring 24.
The first and second sealing parts 24d and 24e of
It closely contacts the outer peripheral surfaces of 21, 22 and double-seals the connecting portion.

Next, a fitting 31 is attached to the outer periphery of the connecting portion of the pipes 21 and 22 which are liquid-tightly connected by fitting the connecting ring 24. As the joint tool 31, one in which the housings 33 and 34 are rotatably connected to each other by the rotation connecting portion 41 by the long-axis bolt 45 in advance, and with the housings 33 and 34 opened,
The recessed portions 35 of the housings 33 and 34 are the protrusions 21b and 22.
Positioning is performed so as to face b and the connecting ring 24 fitted between these ridges 21b and 22b. Subsequently, the housings 33 and 34 are rotated so as to be closed around the rotation connecting portion 41 as an axis, and as shown in FIG.
24 and the ridges 21b and 22b are fitted and housed. In this state, the bolt 55 is passed through each of the projecting piece portions 52 and 53 of the fastening portion 51, and the nut 56 is screwed and tightened, thereby
When 33 and 34 are fixed in the closed state, the connection and assembly are completed.

As described above, according to the pipe joint device of the present embodiment, the connection ends of the ridges 21b and 22b of the pipes 21 and 22 are connected.
The housings 33 and 34 of the fitting 31 in which the connection ring 24 is fitted on the 21a and 22a sides and which is opened with the rotation connecting portion 41 as the rotation axis are attached to the outer peripheries of the pipes 21 and 22 in the vicinity of the ridges 21b and 22b. Cover the housings 33 and 34 and close one of the fastening parts 51 with a bolt.
By the simple work of tightening with 55 and nut 56,
The pipes 21 and 22 can be easily connected to each other in a short time.

That is, when the connecting ring 24 is attached to the pipes 21 and 22 at predetermined positions, the connecting ring 24 is attached to the ridges 21b,
It is possible to position at an appropriate position by a simple operation of just abutting on 22b, and it is possible to easily confirm the position by the positioning portion 24c. Therefore, as compared to the conventional example shown in FIG. 7 or the like in which it is difficult to know the proper position for fitting the connection ring, the mental burden on the worker can be reduced and the work is facilitated. , Work efficiency can be improved.

Also, when mounting the fitting 31, the recessed portion
It is possible to accurately position 35 by fitting the connection ring 24 and the ridges 21b and 22b with each other, and to accurately position the bolts.
Since 55 can be fastened in only one place, work on-site can be performed more easily than in the conventional configuration in which a pair of claws are engaged in the shallow groove formed in the pipe and fastening work is required at two places. The work efficiency can be improved easily.

Further, in this state, the connecting ring 24 and the projections 21b and 22b are entirely covered in the cylindrical recessed portion 35 of the fitting 31 to be tightened and fixed, and the recessed portion 35 is formed.
The projections 21b and 22b can be engaged with each other to firmly connect the pipes 21 and 22 to each other. In addition, the extending portion 37 extending along the outer peripheral surface of the pipes 21 and 22 does not directly receive the tightening force of the bolts 55 and the like, and receives the vibration generated in the pipes 21 and 22. Also, since it functions like a blade and can effectively absorb the vibration, the piping 21,
It is possible to prevent the pipe from coming off and dropping, improve the seismic resistance of the pipe connecting portion, and enable long-term use.

The connection ring 24 is housed in the tubular recess 35 of the fitting 31, and the connection ring 24 has a first seal portion 24d in which a pair of steel bead wires 26 are embedded. Since the double seal structure is integrally provided with the second seal portion 24e which is formed inside the first seal portion 24d and serves as a seal valve, the connecting portion between the pipes 21 and 22 can be securely connected. Can be sealed.

Further, the housings 33 and 34 of the fitting 31 are
Since the bolts 55 and nuts 56 are fixed at one place by screwing, the bolts 55 and nuts 56 are loosely screwed and the housings 33 and 34 are opened, so that the connected pipe 2
It is possible to disassemble 1, 22 and it is possible to easily perform maintenance inside the pipes 21, 22. And
Since the pipes 21 and 22 are connected without welding,
It is possible to prevent generation of rust due to welding work.

By forming the housings 33 and 34 by hot forging and heat-treating, the strength against impact can be improved and the weight can be reduced as compared with the conventional casting. The cost can be reduced.

In each of the above embodiments, the fitting 31
The housings 33 and 34 are rotatably connected to each other at the rotation connecting portion 41 by using the long shaft bolt 45 and the nut 46.
Instead of the long shaft bolt 45 and the nut 46, for example, a split pin 47 shown in FIG. 3 is used, or as shown in FIG.
It is also possible to use one in which the headed pin 48 is passed through the hole of the rotary connecting portion and then the other end is caulked.

Further, as the bolts and nuts constituting the fasteners for fixing the housings 33 and 34, so-called high tension bolts in which a part of the screw of the bolt is broken when tightened to a constant torque can be used. Then, by using such a high tension bolt, when the tightening torque reaches a certain torque, a part of the screw of the bolt is broken to prevent further tightening,
As compared with the conventional work in which it is unclear how much the tightening can be done, the tightening work becomes significantly easier, and moreover, a constant tightening torque can always be obtained.

[0034]

According to the pipe joint device of the first aspect,
In the vicinity of each connection end of the pipe, attach the connection ring to the connection end side of each ridge of the pair of pipes to be connected and open the pair of housings with one end as the rotation axis. The pipes can be easily connected to each other in a short time by covering the outer periphery of the pipe, closing the housings, and fastening and fixing the other ends with a fastening tool. Then, in this state, each ridge can be housed in the recess of the fitting to firmly connect the pipes to each other, and the connection ring can be housed in the recess of the fitting to reliably seal the connecting portion. be able to. Furthermore, in this state, vibration can be effectively absorbed by the extension part that extends along the outer peripheral surface of each pipe, so that the pipes can be prevented from coming off or falling off when subjected to vibrations, and the pipe connection can be prevented. Seismic resistance in the part can be improved. Further, by loosening the fastener and opening the housing of the fitting, it becomes possible to disassemble the connected pipe, and maintenance of the inside of the pipe can be easily performed.

According to the pipe joint device of the second aspect, in addition to the effect of the first aspect, the double sealing by the first and second sealing portions and the strength by the core material embedded in any one of the sealing portions. By improving the above, the connecting portion between the pipes can be reliably sealed. Further, the fitting position of the connection ring can be easily confirmed by the positioning portion provided so as to face the connection end, and the connection work between the pipes can be facilitated.

According to the pipe joint device of the third aspect, in addition to the effect of the first or second aspect, since the housing is formed by hot forging, the strength against impact can be improved as compared with casting and the weight is light. Can be enabled.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a pipe joint device of the present invention.

FIG. 2 is a partial cross-sectional view of the above pipe joint device.

FIG. 3 is a partial perspective view showing another embodiment of the present invention.

FIG. 4 is an explanatory diagram showing still another embodiment of the present invention.

FIG. 5 is a perspective view illustrating a conventional pipe connecting method by full circumference welding.

FIG. 6 is a cross-sectional view of a part of a pipe connected by the above connection method.

FIG. 7 is an exploded perspective view illustrating a conventional pipe joint.

FIG. 8 is a cross-sectional view of a part of the pipes connected by the same pipe joint.

[Explanation of symbols]

 21, 22 Piping 21a, 22a Connection end 21b, 22b Projection 24 Connection ring 24b Seal part 24c Positioning part 24d First seal part 24e Second seal part 31 Fitting 33, 34 Housing 35 Recessed part 37 Extension Part 55 Bolts that make up the fastener

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hirotoshi Kotoku 4th day stock company at 220 Ikemachi, Hamamatsu City, Shizuoka Prefecture

Claims (3)

[Claims] 1. A ridge portion formed along the circumferential direction on the outer periphery of each connection end of pipes that are butt-connected to each other, and elastically adhere to the outer peripheral surface between the ridge portions of the pipe. The connecting ring is provided with a seal portion, and a tubular shape is formed of a pair of housings, one end of which is rotatably connected to the other end of which the other end is fastened and fixed to each other by a fastening tool. A pipe joint device comprising: a recessed portion capable of accommodating a connection ring; and a fitting provided with an extended portion extending along an outer peripheral surface of each of the pipes. 2. The seal portion of the connection ring has a pair of first seal portions that are in close contact with the respective pipes, and these first seal portions.
A pair of second seal portions that are in close contact with each other on the connection end side of each pipe with respect to the seal portion, and a positioning portion that faces the connection end, and at least one of the first and second seal portions is provided. The pipe joint device according to claim 1, wherein the core material is embedded. 3. The pipe joint device according to claim 1 or 2, wherein the housing is formed by hot forging.