JP2002174378A - Electrolytic corrosion-preventive joint for pipes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrolytic corrosion-preventive joint for a dissimilar metal pipe connection part of minor bore water pipe, gas pipe or the like, and an adaptor. SOLUTION: This joint for dissimilar metal pipe end connection part comprises a composite block having a locking mechanism for each pipe end in the center and formed by use of an insulating material, ring-like gaskets allowed to abut on both axial ends thereof, each material-made retainer having a cylindrical part having a fixing means to the pipe outer diameter part and end parts extended in a cup shape, which is put on the side surface of each retainer, and a socket capable of caulking through an insulating material from the outer part of the retainer. This joint is constituted also as a male and female type composite adaptor having a body part with inner screw and outer screw to be fixed to the outer circumferential thread part of the pipe end part, or a male and female type composite adaptor comprising each dissimilar metal- made nipple having female thread on the inside part and an outer shell, and a metallic casing for covering the adaptor with an insulating material being filled to the central clearance part and the circumferential part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to pipes of different kinds of metal, mainly for small-diameter tap water or gas or other fluids, or for equipment or
The present invention relates to a joint for preventing electrolytic corrosion intended for joining with instruments.

[0002]

2. Description of the Related Art Conventionally, in a joint for dissimilar metal joining, such as a water pipe or a gas pipe mainly having a small diameter, a flange type in which an insulating spacer can be attached to prevent electrolytic corrosion, or In this case, an insulating paint is applied to the joint portion, but further workability and performance improvement have been demanded.

[0003]

SUMMARY OF THE INVENTION In view of the above problems, the present invention is directed to preventing electrolytic corrosion occurring at a joint between different metal pipes such as a water pipe or a gas pipe or between a valve and an instrument. The purpose of the present invention is to provide a joint for achieving the above, and to provide an adapter and the like.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a joint structure for joining pipes of different metals or a pipe attached to a related instrument using a composite material using an insulating material. In order to form a layered structure, a cylindrical stopper ring provided with a locking mechanism in the inner diameter direction and an outer flange is provided at each end of the connecting portion of the dissimilar metal pipe with each material metal, and a predetermined gap is provided in the center between the two. The space between the outer flanges is filled with an insulating material, such as rubber or resin, which can be completely bonded, and integrally molded to form a composite block in which both ends can be fitted to both ends of the pipe. A thick ring-shaped elastic gasket with compression allowance, which is inserted into the outside diameter of the pipe, is fitted to and contacted with both axial end surfaces, and both gaskets are covered from outside in the axial direction. Metal retainer A predetermined-length circular pipe portion whose inner diameter is hollowed out and provided in a bowl shape having a predetermined diameter to be fitted to the outer diameter of the pipe, and which is connected to the outer side of the inner diameter to expand the root portion and is initially molded. The gasket-equipped bowl-shaped retainer is formed so that both gaskets are separated from each other at both ends of the center, and the outer outer diameter portion straddling both retainers is made of insulating material such as a cylindrical resin. The doughnut-shaped spacer is attached to the back surface on the outside in the axial direction, and the spacer is divided into two or three parts in the axial direction from the outside of the spacer and provided with a coupling mechanism such as a screw. By inserting a coupling and caulking the gasket while compressing it from both ends, it is joined by caulking, and expanding the pipe between the inner diameter part of the circular pipe part and the outer peripheral part of the pipe of this both-end retainer, or forming a groove and biting ring Fix by fixing means Insulation to constitute a joinable piping galvanic corrosion joint without metal pipe contact each other. Incidentally, the composite block may be provided integrally with a reinforced resin or the like.

[0005] In addition, the above-mentioned joint for different kinds of pipe joints,
In order to form an insulative composite adapter that is fixed to and joined to one end of the pipe, a nut with a female thread that can be screw-fixed is made of the same material as the pipe threaded to the outer diameter of the end. A locking mechanism for locking to the end of the pipe is provided in the inner diameter direction at one end of the nut, and the outer diameter portion is
A circular or polygonal predetermined large area is provided on both end surfaces to provide a circumferential pressure receiving area, and further, the nut outer periphery and one side of the pressure receiving surface are made of dissimilar metal, and an external thread is provided on the outer peripheral portion. Is covered with a socket formed in the shape of an inner flange, and these are combined and arranged with a hollow gap, and the gap is filled with an insulating material such as rubber or resin, or is interposed by bonding over the entire surface or the like. To form a composite adapter which is integrally molded, furthermore, an insulating elastic gasket is brought into contact with the connection side end face of the composite adapter, and the flange with a cap nut having the other pipe and fixing means, or
Connected to the end of the pipe using an expanded female socket, etc.
A male-female screw type electrolytic corrosion preventing adapter that can be joined to the composite adapter and the pipe screw joint using a joint seal or the like can also be used. In the composite adapter, the insulating material portion of the gap and the elastic gasket may be integrally formed using a rubber material having a predetermined hardness. In addition, directly in the socket, the insulating material portion,
Further, the composite adapter can be formed by integrally providing the nut with a material such as a reinforced resin. In addition, it is also possible to form a unit in which a predetermined length of the same material pipe is integrally connected to the inner diameter portion of the one metal material nut, and to provide a fixing means outside the pipe portion. Alternatively, one end is provided as an inner flange which is swaged so as to be overlapped with the pressure receiving surface on the entire outer surface of the nut with the inner diameter portion thread, and a pipe or a fixing means such as a screw is connected to the other end. It is also possible to form a unit by providing a gap and covering the housing, filling the gap with an insulating material and integrally molding the gap. Further, the nut and the insulating material inside the housing may be formed by using a reinforced resin or the like.

Further, an insulating composite adapter, which is fixedly connected to a screw portion provided at an outer diameter portion of each pipe end as a joint for the different type pipe connecting portion, is formed by connecting a cylindrical nipple made of each material to A female screw is provided on the inner diameter part, and a locking mechanism capable of locking on one end inner diameter part to the pipe end, and an outer flange having a predetermined diameter on the other outer end are integrally provided, and both nipples are provided at the center part by predetermined parts. A gap is provided and symmetrically arranged, and furthermore, a hollow gap is provided on the outer periphery of both nipples, and a metal casing that is externally included is formed by providing inner flanges at both ends and combined, and an insulating material is provided on the gap. And integrated therewith, and can be configured as a female-female screw type electrolytic corrosion prevention adapter which can be connected to each pipe end thread portion using a joint seal or the like. In addition, the same material pipes may be provided in each of the dissimilar metal nipples of the composite adapter in both axial directions and integrally provided, and fixing means may be provided on an outer portion of the pipe portion to form a unit type adapter. . In addition, the two internal nipples and the insulating material portion may be molded with an integral internal thread made of a reinforced resin or the like to form an integrated adapter including a metal casing outside.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partially cutaway front view of a pipe joint 1 embodying the present invention, and FIG. 2 is an upper front view of the same cross section, showing before and after assembly at the same time. , And a cylindrical stopper ring 3A, 3B made of each material at the joint end of 2B.
B is formed by providing an inner diameter locking mechanism 3a and an outer diameter expanding flange 3b. The locking mechanisms 3a of the stopper rings 3A and 3B are arranged concentrically and symmetrically so as to face each other with a gap A provided at the center. A composite block 5 is formed by filling a space portion of the stopper rings 3A and 3B generated between the diameter-enlarged flanges 3b with an insulating material 4 such as rubber or resin which can be completely adhered and integrally molded, and A thick ring-shaped elastic gasket 6 provided with a compression allowance B on both end outer surfaces of both enlarged flanges 3b is brought into contact with the outer diameter portions of the pipes 2A and 2B, and further inserted into the outside. 6 An inner diameter portion formed of each material is cut out from the axial side portion to the outside, and a bowl portion 7a that fits into the outer diameter portion of the pipes 2A and 2B is provided in the axial direction. The part has an expanded shape at the beginning Connected retainer tube portion 7b 7
A, and 7B are attached without contacting them at the center, and an insulating spacer 8 such as a cylindrical resin is attached to the outer outer diameter portion of the retainers 7A and 7B.
A disk-shaped spacer 9 is mounted on the outer back of the bowl 7a, and a metal coupling 1 with a coupling mechanism such as a screw F divided into three parts in the axial direction from the outside of the spacers 8,9.
0, the compression allowance B of the gasket 6 is compressed from both ends and pressed against the outer diameters of the pipes 2A, 2B, and caulked while the retainers 7A, 7B are insulated from each other, and
Grooves D and the like are provided at predetermined positions on the outer peripheral portions of the pipes 2A and 2B at the roots of the inner diameter portions of the initially formed enlarged diameter portions C of the circular pipe portions 7b connected outward from the inner diameter portions of the retainers 7A and 7B. A fixing means E in which the biting ring 11 attached by abutment is brought into contact with the circular tube portion 7b and the enlarged diameter portion C is caulked with a jig.
It is formed as. Since the joint 1 of the present invention is formed as described above, the expansion and contraction of the pipes 2A and 2B are fixed by the fixing means E, and at the same time, the pipe 2 is fixed by the locking mechanism 3a of the stopper rings 3A and 3B of the composite block 5.
A and 2B are formed so that the extension of the pipes 2A and 2B is prevented and the expansion and contraction is also fixed by the screw F of the coupling 10, and the pipes 2A and 2B are insulated from each pipe of the composite block 5. Stopper rings 3A and 3B for each of the 2A and 2B materials The insulating material 4 filled in the central gap A portion,
In addition, the spacers 8 and 9 prevent the respective contacts from each other to form a joint for preventing electrolytic corrosion for piping. Although not shown, the composite block 5 can also be provided integrally with a reinforced resin or the like. Also, by using an elastic material for the insulating material 4 of the composite block 5, the joint 1
Can be a flexible joint.

FIG. 3 is a view of a male-female insulating composite adapter 12 showing a second embodiment of the present invention. The female screw of the same material is formed by applying a screw F to the outer diameter of the end of the pipe 2A. At the end of the nut 13 with the FA, a locking mechanism 13a for locking the end of the pipe 2A is provided, and the outer diameter portion is round or
A circumferentially large pressure-receiving surface portion G is provided at both end surfaces provided at a predetermined outer diameter of a polygon, and an inner flange 14 which is overlapped on one end with the pressure-receiving surface G of the nut 13 at one end.
The socket 14 with a is provided of a dissimilar metal provided with a male screw FB on the outer peripheral portion, and the two are half-covered and arranged in combination with a hollow gap, and rubber or
A composite adapter 12 is formed by filling an insulating material 4 such as a resin and integrally molding, and an insulating elastic gasket 15 is brought into contact with an end face of the composite adapter 12 on the joining side, and this is connected to the other pipe 2B and fixing means. A male / female screw type electrolytic corrosion prevention composite adapter 12 connectable by using a flange 16 with a cap nut having, or an expanded female socket, and the like, is used to adjust the expansion and contraction of the pipes 2A and 2B to the pressure receiving surface G, Further, it can be formed by fixing the outer peripheral thread portion FB of the socket 14 and simultaneously joining the nut 13 thread portion FA and the pipe 2A thread portion F using a joint seal or the like. FIG.
A predetermined length of the same material pipe 13A is integrally connected to the inner diameter portion of the nut 13 as described above, and a fixing means E is provided on the pipe 13A to form a nut-mounted unit-type electrolytic corrosion prevention adapter 12A. You can also. Alternatively, as shown in FIG. 5, a locking mechanism 13a for the end of the pipe 2A and a nut 13 having a female thread FA at the inner diameter thereof and having a pressure receiving surface G provided thereon.
A gap is provided on the entire outer surface, and a pipe 1
7A or a coupler 1 having a fixable means such as a screw
7 is press-fitted to the pressure receiving surface G in the form of an inner flange 17B so as to overlap the surface, and the gap is filled with an insulating material 4 that is completely adhered to the coupler-type unit-type adapter 12.
B can also be formed. In this case, the coupler 1
The nut 13 inside 7 and the insulating material 4 covering the outer surface may be formed of a reinforced resin or the like. Although not shown, the composite adapter 12 can be formed by integrally molding the insulating material 4 in the gap and the insulating elastic gasket 15 using a rubber material having a predetermined hardness.

FIG. 6 is a view of a female-female-thread-type insulating composite adapter 18 showing a third embodiment of the present invention. The nipples 19A and 19B made of the above materials are formed by providing a female screw FA at the inner diameter, a locking mechanism 19a at the inner diameter at one end, and an outer flange 19b at the other outer end. The two locking mechanisms 19a of the nipples 19A and 19B are arranged symmetrically with a predetermined gap A provided at the center thereof.
Metal casing 2 provided with inner flanges 20a at both ends
0 is provided outside with a hollow gap, and the gap is filled with an insulating material 4 and bonded and integrated to form a female-female screw type composite adapter 18, which is connected to the pipes 2A and 2B.
The end outer diameter screw portion F is formed so as to be connectable using a joint seal or the like. And, as shown in FIG.
The nipples 19A and 19B of the dissimilar metal No. 8 may be externally extended to provide a pipe 19c of a predetermined length to form a casing-type fixed-end unit 18A having a fixing means and to be insulated and connected to piping. Although not shown, a composite adapter can be formed by filling an outer material such as a reinforced resin into the inside of the metal casing 20 that is externally included and molding the inner casing with a female screw at the inner diameter.

[0010]

The present invention mainly relates to a joint or an adapter for joining dissimilar metal pipes such as small-diameter water pipes or gas pipes, and has the following excellent effects. . Since the joint structure is provided insulated with multiple layers of dissimilar metals, it is possible to completely prevent electrolytic corrosion occurring at the end contact portion of the conventional dissimilar metal pipe. The pipes or the straight ends of the associated valves and instruments can be joined. A multi-layer insulated adapter can be provided and joined to each end of the pipe or related instrument by screwing or by applying any fixing means. Dissimilar metal pipes can be insulated, their service lives can be extended, and maintenance can be facilitated. The cost is low and the joining is easy.

[Brief description of the drawings]

FIG. 1 is an overall front view, partially cut away, of a joint surrounded by a cylindrical casing and formed in a multilayer structure.

FIG. 2 is an exploded configuration view of the cross-sectional front upper view of FIG. 1 after assembly on one side and before assembly on one side.

FIG. 3 is a front cross-sectional top view showing a state in which a male-female screw type composite adapter provided with a pressure-receiving surface at one end is connected to one of the pipes, and a diagram of a flange with a joint glove nut for joining.

FIG. 4 is a front elevational sectional front view of a unit in which the internal nut and a joining pipe are integrally provided.

FIG. 5 is a front cross-sectional top view in which a joining coupler is covered on an outer surface of an inner nut via an insulating material and provided as an integrated unit.

FIG. 6 is a front cross-sectional top view of the female-female composite adapter.

FIG. 7 is a front cross-sectional top view of an adapter provided as an integral unit by extending a joining pipe to the internal nipple.

[Explanation of symbols]

1. Joint for preventing electrolytic corrosion of the present invention 2A; One material pipe 2B; The other material pipe 3A; One material stopper ring 3B; The other material stopper ring 3a; The same locking mechanism 3b; 4, an insulating material 5; a composite block 6; a ring-shaped elastic gasket 7A; a retainer 7B of one material; a retainer 7a of the other material; a bowl 7b; a tube 8; a cylindrical insulating spacer 9; Disc-shaped spacer 10; coupling 11; biting ring 12; male-female screw type composite adapter 12A; nut direct mounting unit type composite adapter 12B; coupler type unit type composite adapter 13;
Adapter nut 13A; Extension pipe 13
B: deformed nut 13a; locking mechanism in the same inner diameter direction 14;
Same socket 14a; inner flange 15;
Elastic gasket 16; flange 17;
Coupler 17A; Connection pipe 17
B; inner flange 18; female-female casing type composite adapter 18A; unit-type adapter with both ends fixing means 19A; nipple 19B of one material; nipple 19a of the other material 19a; locking mechanism 19b in the same inner diameter direction; Outer flange 19c; Extension pipe 20; Casing 20a; Inner flange 21; Instrument 22; O-ring A; Gap B; Compression allowance C;
Initially expanded circular pipe enlarged section D; grooved section E; fixing means F;
Screw processing part FA; Female screw part FB; Male screw part G;
Pressure receiving surface

Claims (3)

[Claims] In a joint as a straight end (hereinafter referred to as a pipe) joining means between pipes of dissimilar metals or with an accessory instrument for piping, the joint structure is connected to the outer diameter portion at both ends of the pipe joint. A tubular multi-layer structure to be inserted by bridging, a cylindrical stopper ring for each material that can be fitted to the outer diameter part of the end of each dissimilar metal pipe, a locking mechanism provided in the inner diameter direction of one end,
The other end of the outer surface is formed to have a flange-shaped surface by expanding the other end to a predetermined diameter, and the stopper rings are arranged symmetrically with a predetermined gap provided in the center thereof to form the flange-shaped surface space. Is filled with an insulating material such as rubber or resin that can be completely bonded to form a composite block integrally molded, and inserted into the outer diameter portion of the pipe at both ends in the axial direction of the composite block. A possible and a thick ring-shaped elastic gasket provided with a compression allowance is abutted, and both gaskets are provided with a bowl-shaped retainer made of dissimilar metal from the axial side, and the inner diameter is the outer diameter of the two pipes. The inner portion of the retainer is provided in a bowl shape having a predetermined diameter in the axial direction, and the rim portion is initially expanded in the axial direction to form a circular tube with a predetermined length. And externally mounted, and a cylindrical shape on the outer diameter of the outer surface straddling both retainers. And, in the both outer surface portion is interposed by mounting the insulation material made spacer such annular plate-like resin, and, 2 divided from both said spacer outside, in the axial direction,
Alternatively, a coupling made of metal or the like, which is divided into three and each of which is provided with a coupling mechanism such as a screw, is inserted, and the gasket is compressed and caulked while being compressed, and is connected to the inner diameter of the circular pipe of the retainer at both ends. An electrolytic corrosion preventing joint for piping, wherein fixing means is provided between adjacent pipe outer peripheral portions and connected to each other, and the different metal pipes are insulated and connectable. 2. A female threaded nut made of the same material that can be coupled to a threaded portion provided on an outer diameter portion of one end of a pipe in a joint used for joining the dissimilar metal pipes. An inner diameter end portion is provided with an inner diameter locking mechanism for locking to the pipe end portion, and the nut outer diameter is provided in a circular shape or a polygon having a predetermined large size, and circumferential pressure receiving surfaces are formed on both end surfaces in the axial direction. The nut is formed by providing a male screw on the outer peripheral portion of the socket and an inner flange on one end surface. The composite adapter is formed so that it can overlap with the pressure receiving surface, is arranged in combination with a hollow gap, and is filled with an insulating material such as rubber or resin to form a composite adapter. In addition, the joint end face of the composite adapter has insulating elasticity A gasket is abutted, and this is connected by caulking to the composite adapter outer diameter screw portion using the instrument made of another material, or a flange with a cap nut having a pipe and a fixing means, and the like. The joint for preventing electrolytic corrosion for piping according to claim 1, wherein the joint is configured as a male-female thread type adapter that can be joined to a nut inner diameter part and the pipe thread part using a joint seal or the like. 3. A joint used in the above-mentioned joint of different kinds of metal pipes, wherein a female screw is provided on a cylindrical inner diameter portion of each material for connecting a screw portion provided on an outer peripheral portion of both ends of the pipe. A dissimilar metal nipple is formed by providing a locking mechanism capable of locking each end of the pipe in one end inner diameter direction, and integrally providing an outer flange having a predetermined diameter as a pressure receiving surface at the other outer end, The two nipples are arranged symmetrically with a predetermined gap in the center, and inner flanges are provided at both ends including a hollow gap between the outer periphery of the nipples and the outer diameter of the pipe. An outer casing is provided to form and combine with the outer flange outer surface so that the surface can overlap, and the gap is filled with an insulating material to be integrated, and joint seals and the like are provided at the respective pipe end thread portions. Configured as a female-to-female adapter that can be joined using The joint for preventing electrolytic corrosion of piping according to claim 1 or 2.