JP3933227B2 - Mechanical pipe end anticorrosion pipe fittings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe joint, and more particularly to a mechanical pipe end anticorrosion pipe joint capable of joining a lining steel pipe without forming a screw and an annular groove in a connecting pipe.
[0002]
[Prior art]
As shown in FIG. 4 , the anticorrosion pipe joint for a lining steel pipe includes a joint main body 1 in which a female screw 1a is formed, and a resin anticorrosion portion 2 formed inside the joint main body, and a male screw 3b is formed. The anticorrosion structure is obtained by screwing the connecting pipe 3 into the female thread 1a of the joint body 1. The pipe joint shown in FIG. 4 uses the connecting pipe 3 in which the resin lining 3a is formed on the inner surface and the male screw 3b is formed. As shown in FIGS. 5 and 6 , as the lining steel pipe becomes widespread, the connecting pipe is used. There has been proposed a mechanical pipe joint capable of connecting the connection pipe 3 without forming a screw on the pipe 3. The mechanical pipe joint that can join the connecting pipe 3 without threading the connecting pipe 3 is used when the connecting pipe cannot be threaded or cannot be rotated like a repair pipe.
As shown in FIGS. 5 and 6 , the mechanical pipe joint 7 is made of a metal joint body 10 having a through hole 11 into which the pipe end of the connection pipe 3 is inserted, and a rubber made in contact with the end of the joint body 10. , A metal nut 13 that is screw-coupled to the joint body 10 and presses the packing 12 against the end of the joint body 10 and the outer surface of the connection pipe 3 via a washer 14, and the inside of the nut 13 And a metal retaining ring 15 formed with a wedge-shaped cross section. The rubber packing 12 is sandwiched between a tapered surface 10 a formed at the end of the joint body 10, a washer 14, and the outer surface of the connection pipe 3. Although not shown in detail, the packing 12 that abuts the end of the joint body 10, and is connected to the joint body 10 by screws and is connected to the end of the joint body 10 via the washer 14 and the outer surface of the connecting pipe 3. The nuts 13 that are pressed against each other are provided at both ends of the joint body 10.
In the mechanical pipe joint 7 shown in FIG. 5 , an annular core 4 is attached to the end of the connecting pipe 3 on which the resin lining 3 a is formed, and the core 4 has a rubber seal that contacts the inner surface of the joint body 10. The member 4a is attached.
7 and 8 , a ring-shaped groove 3 c is formed on the outer peripheral surface of each connecting pipe 3, and a pair of semi-annular housings 30 each having a claw portion 33 fitted in the groove 3 c are replaced with a bolt 31 and a nut 32. The housing type pipe joint fixed by is shown. An annular packing 34 is disposed in the pair of housings 30.
[0003]
[Problems to be solved by the invention]
In the case of repair piping of the mechanical pipe joint shown in FIG. 5 , if a water leakage accident occurs in the connecting pipe 3, as shown in FIG. 9 , the leaking portion of the connecting pipe 3 is cut to a certain length including the water leakage portion. To do. Next, after temporarily attaching the mechanical pipe joint 7 shown in FIG. 5 to each connected pipe end, the short pipe 20 is disposed between the pair of connection pipes 3, and the mechanical pipe joint 7 is attached and tightened. The mechanical pipe joint 7 shown in FIG. 5 has a structure that can be temporarily moved to the inside of the pipe end so that the pipe joint does not protrude from the pipe end during repair piping, and is attached to the pipe end of the connecting pipe 3 in advance. Corrosion at the end of the tube can be protected from the internal fluid by the core 4. However, in this structure, there is a case where the core 4 is not reliably held at a predetermined position at the pipe end after assembly, and there is a problem that the core 4 is forgotten to be attached to the pipe end and the attachment of the core 4 to the pipe end cannot be confirmed.
In addition, as shown in FIG. 6 , a structure in which the anticorrosion part 5 is formed inside the mechanical pipe joint has been proposed. However, when the anticorrosion part 5 is formed, the connection pipe 3 is applied to the central part 5 a of the anticorrosion part 5. Repair piping cannot be performed because of contact. Further, in the housing type pipe joint shown in FIGS. 7 and 8 , it is necessary to form an annular groove 3c on the outer peripheral surface of the connecting pipe 3 to be mounted, and the resin lining covered with the connecting pipe 3 is peeled off. Therefore, the housing type pipe joint cannot be used for a lining steel pipe.
An object of the present invention is to provide a mechanical pipe end anticorrosion pipe joint capable of easily performing repair piping without forming a screw and an annular groove in a connection pipe.
[0004]
[Means for Solving the Problems]
The mechanical pipe end anticorrosion pipe joint according to the present invention includes a joint main body 10 having a through hole 11 into which the pipe end of the connection pipe 3 is inserted, an end packing 12 that contacts the end of the joint main body 10, and a joint main body 10. In the mechanical pipe end anticorrosion pipe joint, the joint main body 10 includes a nut 13 which is screw-coupled to the end packing 12 and presses the end packing 12 against the end of the joint main body 10 and the outer surface of the connection pipe 3 via a washer 14. , One and the other joint piece 41, end packing 12, washer 14 and nut 13 provided at the outer end of each of the one and the other joint piece 41, and the outer peripheral surface of the one and the other joint piece 41. and the connecting member 44 is a pair of housings 30 connected to each other one and the other of the joint piece 41 by the pawl portion 49 is engaged with the annular groove 50 which is, Howe at one and the outer periphery of the other fitting piece 41 And a central packing 42 for sealing liquid-tightly between the one disposed ring 30 and the other joint piece 41. The one and the other joint pieces 41 are each provided with an annular anticorrosion portion 43 having an inner lip 46 that is integrally formed with resin in the through hole 11 and that contacts the resin lining formed on the inner surface of the connection pipe 3. The connection pipe 3 and each joint piece 41 are liquid-tightly sealed via the end packing 12, the washer 14, and the nut 13 of the one and the other joint piece 41, and the connecting member 44 is connected via the center packing 42. One and the other joint piece 41 are connected to each other.
In the embodiment of the present invention, the anticorrosion portion 43 is molded by resin on the joint piece 41, and the pair of joint pieces 41 have the same shape. Anticorrosive unit 43 includes an outer lip 47 which is located radially outwardly of the inner lip 46 is formed in a U-shaped cross section by a connecting portion 48 for connecting the inner lip 46 and outer lip 47.
[0005]
When a water leakage accident occurs in the connection pipe 3, the water leakage location of the connection pipe 3 is cut to a certain length including the water leakage portion during repair piping. Next, after temporarily attaching the one end and the other joint piece 41 having the end packing 12, the washer 14 and the nut 13 to each pipe end of the connecting pipe 3 and the end of the short pipe 20, each nut 13 is attached. Tighten and fix each tube end and both ends of the short tube 20 in a liquid-tight manner. Thereafter, the short pipe 20 is coaxially arranged between the pair of connecting pipes 3 and formed on the outer peripheral surface of the one and the other joint piece 41 in a state where the central packing 42 is arranged between the one and the other joint piece 41. When the claw portions 49 of the connecting member 44 that is the pair of housings 30 are engaged with the annular groove 50 and the one and the other joint pieces 41 are connected to each other, the one and the other joint pieces 41 are firmly connected by the connecting member 44. In addition, the center packing 42 disposed in the housing 30 on the outer periphery of the one and the other joint piece 41 can seal the space between the one and the other joint piece 41 in a liquid-tight manner. In this way, the mechanical pipe end anticorrosion pipe joint 8 can be attached to the pipe end without forming a screw and an annular groove at the pipe end of the connection pipe 3, and a pair of connecting members 44 can be used for repair piping. The joint piece 41 can be connected to easily perform repair piping. Since the inner lip 46 of the anticorrosion part 43 contacts the resin lining 3 a formed on the inner surface of the connection pipe 3, corrosion of the pipe end due to the fluid flowing in the connection pipe 3 can be suppressed.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the mechanical type pipe end anticorrosion pipe joint according to the present invention will FIGS. 1 to 3 , the same parts of the conventional mechanical pipe joint shown in FIGS. 5 and 6 and the mechanical pipe end anticorrosion pipe joint 8 according to the present invention are denoted by the same reference numerals and description thereof is omitted. .
As shown in FIG. 1, the joint main body 10 of the mechanical pipe end anticorrosion pipe joint 8 according to the present invention has an annular anticorrosion portion 43 formed of resin in the through hole 11 and is formed in the same shape. And the other joint piece 41. The one and other joint pieces 41 are connected to each other by a pair of housing connecting members 44 arranged outside the central packing 42 that seals between the one and the other joint pieces 41 in a liquid-tight manner. The connecting member 44 shown in FIG. 1 and the central packing 42 disposed in the connecting member 44 have substantially the same shape as the semi-annular housing 30 and packing 34 shown in FIG. 7 , respectively. The anticorrosion portion 43 is formed in a U-shaped cross section by an inner lip 46, an outer lip 47 disposed on the radially outer side of the inner lip 46, and a connecting portion 48 that connects the inner lip 46 and the outer lip 47. The anticorrosion part 43 is molded integrally with the joint piece 41 with a soft resin such as vinyl chloride, polyethylene, or polybutene resin. An annular groove portion 50 is formed on the outer peripheral surface of each joint piece 41, and a claw portion 49 of the connecting member 44 engages with the annular groove portion 50. The rubber center packing 42 has a pair of edge portions 51 that abut against a corrosion prevention portion 43 that extends radially outward to the outer peripheral surface of the joint piece 41. Since the edge portion 51 abuts against the anticorrosion portion 43, the joint piece 41 does not contact the fluid flowing in the connection pipe 3. The end packing 12, the washer 14, and the nut 13 provided at the outer ends of the one and the other joint pieces 41 are liquid-tightly sealed between the connection pipe 3 and each joint piece 41, and the anticorrosion part 43. The inner lip 46 contacts the resin lining 3 a formed on the inner surface of the connecting pipe 3, so that the connecting member 44 liquid-tightly connects the one and other joint pieces 41 through the central packing 42.
[0007]
When a water leakage accident occurs in the connecting pipe 3 shown in FIG. 3 (a), the water leakage location of the connecting pipe 3 is cut as shown in FIG. . Next, as shown in FIGS. 3 (c) and 3 (d), each pipe of the connecting pipe 3 to which the one and other joint pieces 41 having the end packing 12, the washer 14, the nut 13, and the retaining ring 15 are connected. After attaching to the end and the end of the short tube 20, each nut is tightened and fixed to both ends of the tube end and the short tube 20 in a liquid-tight manner. Thereafter, as shown in FIG. 3 (e), the short pipe 20 is coaxially arranged between the pair of connection pipes 3, and the central packing 42 is arranged between the one and the other joint pieces 41. One and the other joint piece 41 are firmly connected by the member 44. In this way, the mechanical pipe end anticorrosion pipe joint can be attached to the pipe end without forming a screw and an annular groove at the pipe end of the connection pipe 3, and a pair of joints are connected by the connecting member 44 during repair piping. The piece 41 can be connected to easily perform repair piping. Since the inner lip 46 of the anticorrosion part 43 contacts the resin lining formed on the inner surface of the connection pipe 3, corrosion of the pipe end due to the fluid flowing in the connection pipe 3 can be suppressed. The mechanical pipe end anticorrosion pipe joint 8 can be used for a lining steel pipe because it is not necessary to form an annular groove in the connection pipe 3.
[0008]
In the present embodiment, the following effects can be obtained.
[1] The mechanical pipe end anticorrosion pipe joint 8 can be attached to the pipe end in a short time without forming a screw and an annular groove at the pipe end of the connection pipe 3.
[2] At the time of repair piping, it is possible to easily perform repair piping by mounting the anticorrosion portion 43 on the pipe end.
[3] Since the inner lip 46 of the anticorrosion part 43 contacts the resin lining 3a formed on the inner surface of the connecting pipe 3, corrosion of the pipe end due to the fluid flowing in the connecting pipe can be suppressed.
[4] Since the anticorrosion part 43 can be attached in a state where the anticorrosion part 43 is fixed inside the joint body 10, forgetting to attach the anticorrosion part 43 can be prevented.
[5] Since the fixing position of the joint piece 41 with respect to each pipe end can be adjusted, a dimensional error at the time of cutting the pipe end can be absorbed.
[6] The mechanical pipe end anticorrosion pipe joint 8 can be attached to the connection pipe 3 at an arbitrary position obtained by rotating the pipe end of the connection pipe 3 around the axis.
[7] When the connecting member 44 by the housing is used, it is possible to follow the bending or expansion / contraction of the pipe to some extent by the gap 41 a formed between the pair of joint pieces 41 and the clearance between the connecting member 44 and the joint piece 41. For example, it is 3 mm for expansion and contraction and about 1.5 ° for bending.
[0009]
The embodiment of the mechanical pipe end anticorrosion pipe joint 8 according to the present invention can be changed. For example, since water enters the pipe end of the connection pipe 3 from between the resin lining 3a of the connection pipe 3 and the anticorrosion part 43, the intrusion of water is prevented and the inner diameter differs depending on the type of the lining steel pipe, so that the protrusions are anticorrosion It forms in the inner lip 46 of the part 43 so that it may protrude on a radial direction outer side, and desired anticorrosion performance can be obtained irrespective of the kind of lining steel pipe. The protrusion formed on the inner lip 46 of the anticorrosion part 43 abuts on the resin lining of the connecting pipe 3 to improve the sealing performance.
[0010]
【The invention's effect】
As described above, in the mechanical pipe end anticorrosion pipe joint according to the present invention, the mechanical pipe end anticorrosion pipe joint can be attached to the pipe end without forming a screw and an annular groove at the pipe end of the connection pipe. It becomes easy.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a mechanical pipe end anticorrosion pipe joint according to the present invention. FIG. 2 is a cross sectional view before attaching a connecting member from the mechanical pipe end anticorrosion pipe joint shown in FIG. Installation procedure explanatory drawing using mechanical pipe end anticorrosion pipe joint according to the invention
FIG. 4 is a sectional view showing a conventional threaded pipe end anticorrosion pipe joint
FIG. 5 is a cross-sectional view showing a conventional mechanical pipe end anticorrosion pipe joint
FIG. 6 is a sectional view showing another conventional mechanical pipe end anticorrosion pipe joint.
FIG. 7 is a cross-sectional view along the length direction of a conventional housing-type pipe joint
FIG. 8 is a radial sectional view of a conventional housing-type pipe joint.
[Fig. 9] Explanatory diagram of installation procedure for pipe repair using a conventional mechanical fitting [Explanation of symbols]
3. ・ Connection pipe, 8. ・ Mechanical pipe end anticorrosion pipe joint, 10. ・ Fitting body, 10a ・ ・ Taper surface, 11. ・ Through hole, 12. ・ End packing, 13. ・ Nut, 14 ・ ・Washer, 20 ... Short pipe, 41 ... Joint piece, 42 ... Central packing, 43 ... Anticorrosion part, 44 ... Connection member, 46 ... Inner lip, 47 ... Outer lip, 48 ... Connection part, 49 .. claw part 50.. Annular groove part 51.

Claims (3)

A joint body having a through-hole into which the pipe end of the connection pipe is inserted, an end packing abutting against the end of the joint body, and an end packing that is screwed to the joint body and is attached to the end of the joint body via a washer. In a mechanical pipe end anticorrosion pipe joint having a nut that presses against the outer surface of the connecting part and the connecting pipe,
The joint body includes one and other joint pieces, end packings, washers and nuts provided on the outer ends of the one and other joint pieces, and an annular formed on the outer peripheral surface of the one and other joint pieces. a connecting member is a pair of housings for coupling together one by engaging the claw portion and the other of the joint piece in the groove, the one and the other joint piece is arranged in the housing at the outer periphery of the one and the other joint piece With a central packing that tightly seals the gap,
The one and the other joint pieces each include an annular anticorrosion portion that is integrally formed with resin in the through hole and has an inner lip that contacts a resin lining formed on the inner surface of the connection pipe,
The connection pipe and each joint piece are sealed in a liquid-tight manner through end packings, washers and nuts of one and the other joint pieces, and the one and other joint pieces are connected to each other by a connecting member through the central packing. A mechanical pipe end anticorrosion pipe coupling characterized by being connected. The mechanical pipe end anticorrosion pipe joint according to claim 1 , wherein the anticorrosion part is molded by resin on the joint piece, and the pair of joint pieces have the same shape. Anticorrosion portion includes an outer lip disposed radially outwardly of the inner lip, mechanical type tube according to claim 1 or 2 which is formed in a U-shaped cross section by a connecting portion connecting the inner lip and an outer lip End anticorrosion pipe fitting.

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