CN2173888Y

CN2173888Y - Gas thread connection steel-plastic composite pipe and union joint

Info

Publication number: CN2173888Y
Application number: CN 93238361
Authority: CN
Inventors: 杨兴邦
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-03-22
Filing date: 1993-03-22
Publication date: 1994-08-10
Anticipated expiration: 2003-03-22

Abstract

Disclosed is a pipe which conveys corrosive liquid and gas, particularly a gas thread connection steel-plastic composite pipe and union joint. The utility model is characterized in that the craftwork of forming by rolling of the pipe connectors of steel pipes and malleable iron is carried out, and then plastic anticorrosive coating is lined on the inner wall of steel pipes and pipe joints. The connection between the steel-plastic composite pipe and pipe joints are connected through pipe thread, and thus the utility model has the advantages of high intensity, corrosion resistance, compression resistance, low cost, long service life, and novel and reliable tight connection manner which avoids the shortcoming of flange connection. The utility model can be installed immediately when the dimension is determined, being widely suitable for such industries as chemical industry, petroleum, electric power, medicine and architecture.

Description

Gas thread connection steel-plastic composite pipe and union joint

Steel-plastic composite pipe and pipe joint that pipe thread connects are to be used to carry corrosion liquid, gas to guarantee the anticorrosion tubing of medium purity.Adopt roll moulding shaping technology, plastics anticorrosive coat on the wall liner in steel pipe and pipe joint, make its intensity that promptly has steel, rigidity, the characteristic such as corrosion-resistant, wear-resistant, anti-fouling of plastics is arranged again, can be widely used in industries such as chemical industry, oil, electric power, medicine, building, light textile, food.

The producer of domestic production steel-plastic composite pipe and pipe joint is a lot of at present, " flying dragon board " steel-plastic composite pipe and pipe joint as the production of Nantong, Jiangsu Province anti-corrosion pipeline factory, " building the friendship board " steel-plastic composite pipe and pipe joint that Zhuji, Zhejiang Province anti-corrosion pipeline factory produces, and the Placement of the steel-plastic composite pipe of these manufacturer production and pipe joint all is to adopt flange connection, being about to plastic lining translates on the flangeseal end face, during connection two flange plate plastic seal faces are engaged, and with bolt flange screw, thereby reach the purpose that is tightly connected.Owing to be lined with the plastics anticorrosive coat in steel-plastic composite pipe and the pipe joint, and the melt temperature of plastics is very low, temperature will go bad too high will the decomposition, therefore can not adopt welding connecting mode.Being connected between steel-plastic composite pipe and the multiunit tube joint should solve being connected between steel and the steel, resolves being tightly connected between the plastic lining again.

The purpose of this utility model will make exactly that reliable sealing is connected between steel-plastic composite pipe and the multiunit tube joint, promptly to make between steel and the steel, reach reliable sealing between the plastic lining and be connected, make the fed sheet of a media can not water clock in the joint, can not directly contact with the metallic steel body, and will make piping design, installation, safeguard, get the raw materials ready conveniently, it is minimum that pipeline connects the material therefor cost.

The Placement of novel steel-plastic composite pipe of this reality and pipe joint is to adopt pipe thread to connect, as shown in Figure 1, when pipe thread connects, the structural type of steel-plastic composite pipe and pipe joint adopts, steel is moulded compound straight tube connecting end outer layer pipe termination, encased by plastic lining anticorrosive coat flange, and outer garden is processed with external pipe thread, steel-plastic composite pipe joint connecting end, garden taper pipe thread in the steel intracoelomic cavity is processed with, the plastic lining anticorrosive coat is in the steel body in the taper pipe thread of garden, be processed with a garden engagement of loops face apart from the place from first basal plane of end, plastics end face behind compound straight tube flange, multiunit tube joint inner chamber plastics garden engagement of loops face and inner and outer pipes flank of thread all scribble sealer or corrosion inhibitor, the interior garden of compound straight tube external pipe thread and multiunit tube joint taper pipe thread matches and tightens, the tight pressing in two plastic lining mating faces, and between the plastic lining mating face, the very sealer or the corrosion inhibitor layer of book have been formed between the inner and outer pipes flank of thread.

The utility model is compared following characteristics with existing flange connection: when at first the steel that connects of flange is moulded compound straight tube and pipe joint and dispatched from the factory, because the existence of flange plate, volume is big, Heavy Weight is given packing, transportation is made troubles, the compound straight tube that flange connects, because inconvenience blanking assembling flange plate when installing at the scene, therefore dispatching from the factory all will be in advance according to design drawing as last, determine the length dimension of good every straight tube, the two ends flange plate is loaded onto in blanking then, and served as a contrast the plastics anticorrosive coat, therefore make troubles to pipeline technology design and as installed construction, because of the as installed size has error with the design theory size.The pipeline that flange connects, because all there is a pair of flange plate each joint, so the cost of pipeline is than higher, and in addition the inconvenience of flange connections road construct with burying, and yard piping is artificially dismantled destruction easily, and not attractive in appearance.Steel-plastic composite pipe and pipe joint that the utility model pipe thread connects, overcome the deficiency that flange plate connects, because steel is moulded when compound straight tube is on-the-spot to be installed, be to cut off according to on-the-spot actual size, termination plastics flange, the car mantle fiber, connecting means is similar with general water gas pipe pipeline installation construction method, therefore steel is moulded compound straight tube and is shaped as light pipe with pipe end and dispatches from the factory, multiunit tube joint is littler than same specification flange connections joint volume and weight, cost is low, therefore give packing, transportation, installation brings convenience, and reduced the pipeline cost, when designing pipeline in addition, need not mark the design length of every straight tube, also bring convenience for piping design, owing to there is not flange plate, pipeline is more neat, attractive in appearance, outdoor mounted is also than safety and can be used as buried pipeline.The pipe thread Placement is to adopt the sealing of two plastics mating faces to be connected sealing with pipe thread to combine, and is added with sealer or corrosion inhibitor, therefore also has the reliable sealing characteristics.When pipeline need connect with flanged (FLGD) equipment such as pump, valve etc., also can adopt flange connection, the Placement conversion part shown in the at this moment available accompanying drawing 2 is realized the conversion of pipe thread Placement and flange connection.

Accompanying drawing 1 is the sectional drawing of steel when moulding compound straight tube and being threaded with the steel-plastic composite pipe adaptor tube, sequence number 1 is the part section that steel is moulded compound straight tube right-hand member, skin is a steel pipe, internal layer is the plastics anticorrosive coats, the steel tube head of compound straight tube right-hand member is encased by plastics flange layer, and outer garden is processed with external pipe thread, sequence number 2 is wherein part sectioned views of an end of steel-plastic composite pipe joint, skin is the malleable cast iron link, garden taper pipe thread in the left part inner chamber is processed with, internal layer is the plastics anticorrosive coats, and at the left end of plastics anticorrosive coat, in the taper pipe thread of interior garden, be processed with a garden engagement of loops face apart from the place from first basal plane of end, and this mating face is vertical with garden taper pipe thread shaft axis in the left end, and sequence number 3 is sealer or corrosion inhibitor, and it is reaching the effect of playing into film phonograph seal and corrosion protection between the inner and outer pipes flank of thread between the two plastics mating faces.Accompanying drawing 2 is section of structures of Placement conversion part, sequence number 1 is the steel flange dish, sequence number 2 skins are steel pipes, left end links to each other with flange plate weldering knot, right-hand member is processed with external pipe thread, internal layer is the plastics anticorrosive coats, two ends, left and right sides plastics flange layer encases flange plate left end side, steel pipe right-hand member head respectively, to guarantee that the fed sheet of a media different metal directly contacts, when needs are connected with flanged (FLGD) equipment, available conversion part left end flange is connected with vessel flange, and the right-hand member external pipe thread just can adopt the pipe thread Placement to link to each other with the steel-plastic composite pipe joint.

Steel-plastic composite pipe and pipe joint that pipe thread connects, as shown in Figure 1, steel is moulded compound straight tube sequence number 1, the outer layer pipe material is to adopt the water gas conveying steel pipe, seamless steel pipe, sequence number 2 multiunit tube joints, sheathing material is the malleable cast iron pipeline link that adopts GB GB3289.1～3289.39-82 regulation, commonly used have an elbow, threeway, four-way, external first-class, sequence number 1, sequence number 2 plastic lining anticorrosive coats are polyethylene, polypropylene, its plastics anticorrosive coat thickness can be 1.5～10mm, with the compound straight tube of inside nominal diameter Dg50 and the compound socket of Dg50 is example, the structural type that the utility model pipe thread connects is described, at the compound straight tube of Dg50 with before compound socket is connected, should be by in the accompanying drawing 1 shown in the sequence number 1, to the right connecting end of the compound straight tube of Dg50, carry out processing, prescind the long outer layer pipe of 5mm earlier, keep the plastic lining layer, and termination plastic lining layer local uniform heated, during the plastics molten state, with Dg50 sizing die pressing termination plastics, make the plastics flange encase steel tube head, can avoid steel tube head directly to contact with fed sheet of a media, the garden goes out external pipe thread with die head threading machine or machined into outside steel pipe subsequently, the compound socket of Dg50 left side connecting end, see shown in the sequence number 2, the steel intracoelomic cavity is processed with the garden taper pipe thread, the plastic lining anticorrosive coat is in the steel body in the taper pipe thread of garden, be processed with a garden engagement of loops face apart from the place from first basal plane of end, also should be before the connection at the plastics end face behind the compound straight tube flange of Dg50, compound socket inner chamber left side plastics garden engagement of loops face of Dg50 and inner and outer pipes flank of thread are all coated sealer or corrosion inhibitor, press again shown in the accompanying drawing 1, garden taper pipe thread in compound straight tube external pipe thread of Dg50 and the compound socket is matched, and satisfy the step with pipe wrench and tighten, make between the two plastic seal mating faces and produce impacting force, and combine closely, this moment is between the plastic lining mating face, formed the very sealer or the corrosion inhibitor layer of book between the inner and outer pipes flank of thread, be connected with compound socket reliable sealing thereby make the Dg50 steel mould compound straight tube.

Claims

1, a kind of steel-plastic composite pipe and pipe joint of pipe thread connection is characterized in that steel is moulded compound straight tube and the steel-plastic composite pipe joint adopts the pipe thread Placement.

2, steel-plastic composite pipe and pipe joint that pipe thread according to claim 1 connects, its feature is when pipe thread connects, the structural type of steel-plastic composite pipe and pipe joint, steel is moulded compound straight tube connecting end outer layer pipe termination, encased by plastic lining anticorrosive coat flange, and outer garden is processed with external pipe thread, steel-plastic composite pipe joint connecting end, garden taper pipe thread in the steel intracoelomic cavity is processed with, the plastic lining anticorrosive coat is in the steel body in the taper pipe thread of garden, be processed with a garden engagement of loops face apart from the place from first basal plane of end, plastics end face behind compound straight tube flange, multiunit tube joint inner chamber plastics garden engagement of loops face and inner and outer pipes flank of thread all scribble sealer or corrosion inhibitor, the interior garden of compound straight tube external pipe thread and multiunit tube joint taper pipe thread matches and tightens, the tight pressing in two plastic lining mating faces, and between plastic lining engages, very thin sealer or corrosion inhibitor layer have been formed between the inner and outer pipes flank of thread.