RU2544122C1 - Electrical insulating joint - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: joint piece comprises branch pipes from metal pipe sections divided by a dielectric insulator in the junction, an outer electrical insulating adapter between the branch pipes which is made from composite dielectric material, wound on the branch pipes with the help of curable adhesive compound, and a wire frame wound tightly. Rods crossing the wire turns are installed under the wire turns.

EFFECT: expansion of manufacturing capabilities.

9 cl, 5 dwg

Description

The invention relates to the field of pipeline transport, and in particular to the protection of pipelines from corrosion, and can be used to electrically disconnect pipelines into sections protected from corrosion by tread or cathodic protection methods.

A current-insulating pipe connection is known (RU 2174638), which contains two metal pipes electrically isolated from each other by a fiberglass ring, a fiberglass pipe and a dielectric coil in the form of a fiberglass pipe, and connected on both sides by welding with equipment or pipeline communications, in which the dielectric coil has a length greater than the diameter of the pipeline, placed in a groove with a thread located inside the nozzles, and connected to the nozzles with glue and thread, ennoy at the ends of the coil, and the fiberglass pipe is wound on the outside of tubes.

A wound fiberglass pipe is the most responsible structural element of the connection, while the connection according to RU 2174638 does not specify the technological methods and design features aimed at improving the operational and strength characteristics of the connection through an electrically insulating adapter between metal pipes.

Known sleeve electrically insulated pipe connection (RU 64728), containing nozzles of metal pipe sections, separated by an insulator, an adapter between the nozzles in the form of a pipe of composite dielectric material wound from tape material using cured adhesive on the outside of the nozzles and a metal covering the adapter the coupling, on the wound tape material of the adapter before curing the glue, a steel wire is removed with an interference fit, removed from the adapter after curing glue, and the outer surface of the adapter is machined, and the wire is winded with a snug fit of the coils of wire to each other, the outer surface of the adapter is machined in the period after removing the wire to install a metal sleeve, which is subjected to radial deformation to eliminate gaps between the sleeve and adapter, on the metal pipe sections in the place of winding the adapter made annular recesses and a method of manufacturing a clutch electrical insulator a pipe connection (RU 2341720), in which the pipes are made of metal pipe segments with an insulator installed in the joint between them, an adapter is installed between the pipes in the form of a pipe made of composite dielectric material wound from tape material using cured glue on the outside of the pipe wound the tape material of the adapter, before curing the glue, wrap the steel wire with an interference fit, which is removed from the adapter after curing the glue, and its outer surface they are machined and a glue layer is applied to the treated surface and a metal sleeve is installed, and the steel wire is wound tightly against each other, the metal sleeve is radially deformed until the gaps between the sleeve and the adapter are removed, and on the metal pipe sections in the place of winding the adapter perform annular recesses.

Clutch electrically insulated pipe connection according to RU 64728 and a method of manufacturing a clutch electrically insulated pipe connection according to RU 2341720 are the technical solution closest to the claimed.

However, in the manufacture of such a connection, it is necessary to withstand the adhesive curing twice (during winding and during installation of the coupling), as well as machining the wound adapter to the inner diameter of the coupling with a guaranteed clearance. The machining of the fiberglass adapter should be carried out under special conditions agreed with the sanitary authorities and protecting workers from the harmful effects of fiberglass dust and epoxy adhesive components.

All this complicates the manufacturing technology of the compound.

The technical result is the expansion of technological capabilities.

The technical result is achieved by the fact that in the insulating pipe insert containing nozzles made of metal pipe segments, separated by an insulator at the joint, an insulating adapter between the nozzles made of composite dielectric material applied to the nozzles using adhesive and at least one a frame with a thread wound with interference, while under the turns of the thread there are rods that intersect with the turns of thread, moreover:

- wire is used as a thread;

- in the place of winding of the insulating adapter on the pipe sections are made annular groove recesses;

- turns of wire are laid with a snug fit of the turns to each other;

- wire segments are used as rods;

- notch is made on the wire segments;

- the ends of the rods protrude beyond the extreme turns of the wire;

- the protruding ends of the rods are bent towards the joint between the nozzles;

- the ends of the turns of wire are bent over one of the ends of the longitudinal rod.

Figure 1 shows a structural diagram of the insert,

figure 2 shows the design of the workpiece of the longitudinal rod,

figure 3 shows a diagram of the bending of the ends of the wire and rods,

Figures 4 and 5 show technological setup diagrams at the beginning and at the end of the insert manufacturing process.

The insert contains two metal pipe 1 made of pipes, between the joints of which an insulator 2 made of dielectric material is installed. A frame adapter 3 is installed on the nozzles 1, made of a composite dielectric material wound around the nozzles using a curable adhesive. As the adhesive composition, epoxy adhesive is used. In the place of installation of the adapter 3 on the nozzles 1 are made of annular groove recesses 4.

The adapter 3 is prefabricated and consists of a first layer of composite dielectric material 5, rods 6 mounted along the axis of the insert, wire winding 7 and a second layer of dielectric material 8.

The turns of wire 7 are wound with interference and with a tight fit of the turns to each other. As the rods 6, wire 7 or another wire 9 with notches was used 10. The ends 11 of the rods 6 are bent at a right angle before assembly, and in the insert they extend beyond the extreme turns of wire winding 7. The length of the straight section 12 of the rod is equal to the length of wire winding 7.

In the assembled position, the ends 11 are bent towards the joint between the pipes, and the ends 13 of the extreme turns of wire 7 are bent at one of the ends of the longitudinal rod 6. This fixes the frame, consisting of wire winding 7 and rods 6.

The insert may contain several frames of the rods 6 and wire 7.

In the manufacture of an insert, a technological mandrel 15 is installed on the spindle 14, on which nozzles 1 and an insulator 2 are fixed, fixed by a threaded device 16. Technological rings 17 with radial grooves 18 are installed on the nozzles.

When the assembled structure is rotated in the direction of arrow 19, the first layer of composite dielectric material 5 is first wound, then rods 6 are installed on the wound layer, the ends 11 of which are inserted into the grooves 18. The wire 7 is wound onto the wound first layer 5 and the rods 6. When winding the wire 7, the first layer of the wound composite dielectric material 5 is tightened, gas bubbles are removed, which leads to hardening of the adapter. At the end of winding the first layer 5, the ends 11 of the rods 6 are bent towards the joint between the nozzles, and the ends 13 of the extreme turns of wire 7 are bent over the ends 11 of one of the rods 6. At the end of the formation of the carcass, a second layer of dielectric material is applied 8. At the end of manufacture, the insert is removed from technological mandrel 15.

Claims (9)

1. An insulating pipe insert containing nozzles made of pieces of metal pipes and separated at the junction by an insulator of dielectric material, an external electrical insulating adapter between the nozzles made of composite dielectric material applied to the nozzles using adhesive, and at least one a frame with a thread wound with an interference fit, characterized in that under the turns of the thread there are rods that intersect with the turns of the thread. 2. The insert according to claim 1, characterized in that the wire is used as a thread. 3. The insert according to claim 2, characterized in that in the place of winding of the insulating adapter on the pipe sections are made annular groove recesses. 4. The insert according to claim 2, characterized in that the turns of wire are laid with a snug fit of the turns to each other. 5. The insert according to claim 2, characterized in that the lengths of the wire are used as rods. 6. The insert according to claim 5, characterized in that a notch is made on the wire segments. 7. The insert according to claim 2, characterized in that the ends of the rods protrude beyond the extreme turns of the wire. 8. The insert according to claim 7, characterized in that the protruding ends of the rods are bent towards the joint between the nozzles. 9. The insert according to claims 2 or 8, characterized in that the ends of the turns of the wire are bent over one of the ends of the longitudinal rod.

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