CN200993289Y

CN200993289Y - Composite pipe joint

Info

Publication number: CN200993289Y
Application number: CN 200620168701
Authority: CN
Inventors: 陈阵
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-12-29
Filing date: 2006-12-29
Publication date: 2007-12-19
Anticipated expiration: 2016-12-29

Abstract

The utility model relates to a compound pipe union, which comprises a gluing part for fixedly connecting the ends of two compound pipes of same diameter and a pipe bushing whose two ends are respectively installed in the ends of the two compound pipes, as well as an elastomer between the outer surface of the compound pipe and the inner surface of the pipe bushing. At processing, first the pipe bushings are fixed, then the ends of the compound pipes are painted, then the pipe bushings are welded; finally liquid elastomer is injected in between the outer surface of the compound pipe and the inner surface of the pipe bushing through the seam reserved when welding the pipe bushings. The compound pipe union comprises two fixedly connecting points, i.e. gluing and welding points between pipes, so that the pipe union will not damage under external force e.g. fluctuation of the earth's crust, therefore the utility model is very suitable for connecting pipes of big diameters.

Description

Multiunit tube joint

Technical field:

The utility model relates to a kind of multiunit tube joint.

Background technique:

In a single day buried pipeline that is used for conveyance fluid leaks, be very difficult and expensive when repairing.The main cause that pipeline takes place to leak is fluctuateed to its damage that causes by the flow-induced corrosion that carried or the earth's crust, wherein, because of flow-induced corrosion causes the position of leakage can relate to the whole pipeline that comprises pipe joint to pipeline, and cause the position of leakage mainly to concentrate on pipe joint to pipeline because of the earth's crust fluctuates, so the quality good or not of pipe joint can be directly connected to the working life of conveyance fluid pipeline.

Adopt composite pipe solve pipeline by the technology of flow-induced corrosion by known to the public.This composite pipe is normally made main pipe body by metallic material, and is coated with one deck plastics at the internal surface of this main pipe body, and its meaning is to want to utilize the rigidity of metal tube and the corrosion resistance of plastics to solve the easy leakage problem of pipeline.But, the connection that fatal defective of the composite pipe fitting of this kind structure is a pipe fitting, because the conveyance fluid pipeline has quite long distance usually, and plastics can not be after the pipe laying operation be finished again by hot melt or otherwise be coated in the internal surface of pipeline, promptly pipeline must adopt the structure that discrete composite pipe fitting connects at the scene.

The connection of two pipe fittings is adopted welding usually or is flexibly connected this dual mode, so-called welding be meant at the scene will adjacent two pipe fittings pass through behind the hot melt fixedly connected, and flexibly connect is to fix by link after flange by being installed in the pipe fitting two ends and the seal ring butt joint again, perhaps adopts the mode of socket joint to fix.Yet, with regard to composite pipe fitting, because the fusing point of the plastics in the composite pipe fitting is relatively low, if adopt the mode of welding to connect, the high temperature that its weld bond periphery is produced in the time of can be because of welding makes the plastic layer fusing, as long as and have in the pipeline just easily to be produced and leak by the zone of flow-induced corrosion; Though flexibly connect the problem that can solve the plastic layer fusing, but, to do the time spent very easily loosening being subjected to external force for active connection, and it can make pipeline directly leak after loosening, simultaneously, in flange or the seal ring of installing in the joint socket normally constitute by the rubber elastomeric material, and the elastic material of rubber-like is easily by flow-induced corrosion that carried, and then makes pipe joint can not realize sealing.

The name of No. 2791429 notice of authorization of Chinese patent is called the example that " can be used for the steel-plastic composite pipe that hot melt connects " provides a kind of composite pipe connection.The composite pipe that this patent proposed comprises three layers, and two-layer inside and outside it is steel pipe, and middle one deck is a plastic layer, and connecting between two pipe fittings is by the rigidity skin of two tube ends is peeled off, by a plastic joint that two pipe fittings are fixedly connected again.Though this kind Placement can not be destroyed plastic layer, because the employing plastics connect the strength deficiency of part, and material is more crisp, so this kind Placement is not suitable for the pipeline of larger caliber; Plastic layer because of this pipe fitting is set in the interlayer simultaneously, so the pipe fitting of this kind structure is not suitable for as carrying corrosive fluid.

No. 1416995 disclosed names of Chinese patent are called the another kind of mode that " method of pipeline butt welding and the pipeline that is welded into " provides a kind of pipe fitting welding.This patent adopts moving anchor clamps and decides the end regions that anchor clamps are clamped in two indentical tubes to be welded respectively, and be provided with the opposite conical surface that scribbles scolder of true dip direction in the end of two adapters to be welded, after with of the conical surface socket joint butt joint of moving anchor clamps with two pipes, utilize heating system to make the solder fusing at joint socket position, treat pipe to be welded together after the scolder cooling.Though this mode operating process that directly adds thermal weld is simple relatively, but, under normal conditions, the fusing point of scolder will be much larger than the fusing point of plastics, in to scolder heating process, while also melts the plastic layer of weld bond periphery, so this kind mode is not suitable for heating the composite pipe that is made of steel pipe and plastic layer.

In addition, the name of No. 2432425 notice of authorization of Chinese patent is called the technology that " the heat insulation welded joint of steel-plastic composite pipe " provides the welding composite pipe.The pipe joint that this patent proposed comprises and is welded on two tube end bellmouth spares to be welded and socket piece respectively, utilizes the mode of socket joint that pipe joint is docked, again by contacted girth welding makes it become as a whole to bellmouth spare and socket piece.Though this pipe joint is provided with thermal-protective coating and anticorrosive coat between bellmouth spare and socket piece, when welding, can protect the pipe fitting inner plastic layer not to be damaged to a certain extent, but, for bigbore pipe fitting, need just can finish between the two butt joint by hanging device and special tool, if be provided with thermal-protective coating and anticorrosive coat again, its butt joint is just difficult more; Simultaneously just rely on the pipe joint girth welding to realize connecting between two pipe fittings, this Placement is not firm, particularly for buried pipeline, is subjected to external force such as earth's crust fluctuation when it and does the time spent and very easily rupture; In addition, the sealing of this pipe joint is to rely on the rubber washer that is arranged in the bellmouth spare to finish, and the rubber washer of this kind structure must directly contact with the fluid that pipeline is carried, if what carried in the pipeline is corrosive fluid, do not have the effect of sealing after rubber washer is corroded, thereby cause pipeline leakage.

Summary of the invention:

Task of the present utility model provides a kind of utilization splicing and welds the same interface of dual mode connection pipe fitting to improve its intensity, can not destroy the multiunit tube joint of composite pipe plastic layer simultaneously when welding.

The multiunit tube joint that the utility model proposed comprises the pipe box that is installed in two composite pipe end regions respectively with the splicing portion that is fixed together of end faces and the two ends of footpath composite pipes with two, and is arranged on the elastomer layer between composite pipe outer surface and the pipe box internal surface.

Described pipe box comprises two short pipe fittings, and an end of each root short pipe fitting extends radially inwardly internal diameter and the identical or akin convex edge of the external diameter of composite pipe, and its other end is that free end or free end are provided with flange.

The end face of described composite pipe is respectively arranged with the identical or essentially identical inclined-plane of direction opposite slope.Described composite pipe comprises metal tube and overlays on the plastic layer of this metal pipe internal surface.

The splicing portion that the multiunit tube joint that the utility model proposed adopts can be adhesively fixed the end face of two composite pipes, its glue can adopt by macromolecular material composite hot melt adhesive or metal-to-metal adhesive, the glue of these kinds is plastics and metallic material such as bonding nonpolar polyethylene well, its adhesion strength and not second to the intensity of electric arc welding, and hot melt adhesive or metal-to-metal adhesive also have performances such as acid resistant alkali; And pipe box can be by the mode combination of welding, and when welding, owing to leave certain intervals between pipe box and the pipe fitting, so, can not destroy the plastic layer of pipe fitting internal surface, simultaneously, this pipe joint comprises bonding and two Fixed Divisions of pipe box welding between the pipe fitting, pipe joint also can not be damaged under external force effects such as earth's crust fluctuation, be very suitable for connecting bigbore pipe fitting; In addition, between the outer surface of the internal surface of pipe box and pipe fitting elastomer layer is set also, this elastomer layer can further improve the counter-bending ability of pipe joint, makes two pipe fitting combinations more firmly.

Description of drawings:

Accompanying drawing 1 is the embodiment's of multiunit tube joint that proposes of the utility model an outward appearance cross-sectional view.

Embodiment:

Referring to Fig. 1, this figure provides the embodiment's of multiunit tube joint that the utility model proposes overall appearance structure.Most preferred embodiment of this multiunit tube joint is to be used to connect the composite pipe 4 that is made of metal tube 41 and the plastic layer 42 that overlays on these metal tube 41 internal surfaces, and it comprises pipe box 1 and elastomer layer 2, and splicing portion 3 these three parts.

Pipe box 1 is made of the short pipe fitting 11 and 12 of two substantial symmetry, the convex edge 13 that each root short pipe fitting 11 or an end of 12 extend radially inwardly, the external diameter of the internal diameter of this convex edge 13 and metal tube 41 is complementary, be that internal diameter is identical or close with the external diameter of metal tube 41, can it be separately fixed at the end of two pre-connection composite pipes 4 by the mode of welding, and make the length of the other end between 43, two short pipe fittings 11 of end face and 12 of composite pipe 4 of short pipe fitting 11 or 12 identical with composite pipe 4 length of being surrounded.Short pipe fitting 11 can also adopt flange to be connected (not providing concrete structure among the figure) with 12 the other end.In order to make composite pipe 4 connect more firmly, be respectively arranged with the identical or essentially identical inclined-plane of direction opposite slope at the end face 43 of composite pipe 4, and two inclined-planes are connected by splicing portion 3.Keep at regular intervalsly between pipe box 1 and the composite pipe 4, in the formed space of this spacing, be provided with elastomer layer 2.

When the above-mentioned multiunit tube joint of processing, at first the end face 43 with two composite pipes 4 is processed into the identical or close inclined-plane of direction opposite slope, to constitute two short pipe fittings 11 of pipe box 1 and 12 convex edge 13 then and be separately fixed on the outer surface of two pre-connection composite pipe 4 ends, and make two short pipe fittings 11 and 12 that the end face 43 of two composite pipes 4 can be docked.Before short pipe fitting 11 and 12 butt joints, earlier be coated with metal-to-metal adhesive or hot melt adhesive at two end face 43 positions that the composite pipe 4 of pipe box 1 is installed, free end 14 with two short pipe fittings 11 and 12 docks again, also can make simultaneously end face 43 butt joints of two composite pipes 4, then the formed circumferential weld in pipe box 1 butt joint back is welded, should remain with one or two slit during to girth welding.If what the end face of composite pipe 4 43 applied is hot melt adhesive, can heat to hot melt adhesive by reserving gaps, make hot melt adhesive fusing back bonding, can also between the internal surface of the outer surface of composite pipe 4 and pipe box 1, inject the elastomer of liquid state in addition by this slit, treat that liquid elastomer layer solidifies the back and forms elastomer layer 2, last again with the slit welded closure of reserving.

Claims

1, a kind of multiunit tube joint, it is characterized in that: this pipe joint comprises that splicing portion and two ends that two same directly end faces of composite pipes are fixed together are installed in the pipe box of two composite pipe end regions respectively, and is arranged on the elastomer layer between composite pipe outer surface and the pipe box internal surface.

2, multiunit tube joint according to claim 1, it is characterized in that: described pipe box comprises two short pipe fittings, and an end of each root short pipe fitting extends radially inwardly internal diameter and the identical or akin convex edge of the external diameter of composite pipe, and its other end is that free end or free end are provided with flange.

3, multiunit tube joint according to claim 1 is characterized in that: the end face of described composite pipe is respectively arranged with the identical or essentially identical inclined-plane of direction opposite slope.

4, multiunit tube joint according to claim 1 is characterized in that: described composite pipe comprises metal tube and overlays on the plastic layer of this metal pipe internal surface.