CN2391090Y

CN2391090Y - Plastic and steel composite pipe fitting

Info

Publication number: CN2391090Y
Application number: CN 99242383
Authority: CN
Inventors: 郑鸿鸣
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-09-03
Filing date: 1999-09-03
Publication date: 2000-08-09
Anticipated expiration: 2009-09-03

Abstract

The utility model relates to a plastic and steel composite pipe component, which is composed of an outer metal shell and an inner lining plastic layer. The utility model is characterized in that the inner parts of the pipe ends of the outer metal shell integrally cast are provided with connecting threads and the inner wall of the outer metal shell between the thread of each pipe end is provided with a plastic lining layer. The utility model has the characteristics of simple process, equipment and labor expenses saving, no wastage on the material of the outer metal shell, plastic lining material saving, convenient installation, etc.

Description

Plastic steel composite pipe spare

The utility model relates to, draining water pipe pipe fitting, comprises the various terminal of water pipe in connecting, as the elbow, two of footpath and reducing lead to, threeway and four-way etc.

Plastic steel composite pipe spare is a plastic layer on the metal shell liner, combine metal tube intensity height, and the plastic inner lining tube wall is smooth, and characteristics such as corrosion-resistant again, non-corrosive are a kind of up-and-coming structural materials.But existing plastic steel composite pipe spare adopts following structure usually: a kind of is symmetrical metallic case by in two, is merged with screw is fastening, buries plastic pipe liner in the metallic case, and screwed flange on the end is burn-on to serve as a contrast with plastic welding again and moulded flange.Another kind of as Chinese patent 92213539.8, name is called " steel-plastics combined integrative pipe ", adopts seamless steel pipe, makes shell through cutting, electric welding, at the outer casing end metal flange of burn-oning, then becomes whole steel casing, makes the plastics lining in steel casing.The characteristics of above-mentioned existing plastic steel composite pipe spare are after steel material passes through machining, are prefabricated into the semi-finished product of pipe fitting, and the adpting flange of burn-oning in half-finished each end again becomes whole steel casing, and be shaped on plastic layer in monolithic case.Therefore, the major defect that prior art exists: the one, metal shell machining extremely bothers; The 2nd, the metallic material waste is very big in the processing; The 3rd, the operating cost height; The 4th, adopt flange connection inconvenience; The 5th, application limitation is big, is only applicable to big, medium caliber pipe connection.

The purpose of this utility model is in order to overcome the defective of prior art, provides a kind of being cast into the bulk metal shell, the inner lining plastic tube layer, and endoporus is smooth, and external form is clean and tidy, and applicability is wide, and plastic steel composite pipe spare easy to connect is installed.

The technological scheme of the utility model plastic steel composite pipe spare is: be made up of metal shell and plastic lining layer, it is characterized in that being shaped on connecting thread, system plastics lining on the metal shell inwall between each pipe thread in the pipe end of metal shell of one casting.

Plastic steel composite pipe spare of the present utility model, its described pipe fitting are elbow or two pass joints or tee union or cross fitting or the first-class various terminals of flat shape loose joint with footpath and reducing.

The utility model is cast into various shells by metallic material, similar in appearance to existing production of making pipe fitting, in the endoporus that respectively connects the end or the shell machining screw of metallic case, in conjunction with the heart mould plastics injection or plastic-blasting is not had on the inwall of screw thread to metallic case again.Therefore, compared with the prior art, have following good effect: the one, whole production process is very simple, saving equipment, expenses such as artificial; The 2nd, compact structure, the external form dexterity is attractive in appearance; The 3rd, save metallic material, not waste; The 4th, plastic inner lining is economized, only injection moulding on the pipe fitting inner wall of not making screw thread; The 5th, it is easy for installation to be threaded; The 6th, applied widely, large, medium and small various caliber multipotencys adopt.

Fig. 1 is an example schematic of the utility model plastic steel composite pipe spare elbow;

Fig. 2 is that the utility model plastic steel composite pipe spare two connects first example schematic;

Fig. 3 is example schematic of the utility model plastic steel composite pipe spare tee union;

Fig. 4 is the flat shape union of a utility model plastic steel composite pipe spare example schematic;

Fig. 5 is example schematic of the utility model plastic steel composite pipe spare spigot;

Fig. 6 is that the utility model plastic steel composite pipe spare plastics lining is shaped on the gasket construction schematic representation.

Below in conjunction with Fig. 1-Fig. 6 embodiment of the present utility model is done detailed explanation.

The utility model relates to plastic steel composite pipe spare, by metallic material, be cast into the metal shell 1 of pipe fitting as carbon steel, various metal shell structures, shape can be produced according to standard GB 3289. * *-82, in the pipe end of metal shell or outside be shaped on connecting thread 2, do not make at metal shell 1 inwall and annotate system or spray plastics lining 3 on the wall of screw thread 2, as select material such as Corvic for use, can adopt other plastic raw material yet.Stipulate according to GB, pipe fitting series has 39 kinds, and present embodiment only gives some instances, and Fig. 1 is the elbow in the pipe fitting, Fig. 2 is two logical, Fig. 3 is threeway, and Fig. 4 is flat shape union, and nut 4 is arranged, Fig. 5 is a kind of spigot, outside thread 5 is built in the outer wall of metal shell 1, and whole inwall system plastics lining 3 ' and, Fig. 6 is that the head at plastics lining 2 is shaped on packing ring 6.

Claims

1, a kind of plastic steel composite pipe spare is made up of metal shell and plastic lining layer, it is characterized in that being shaped on connecting thread (2), system plastics linings (3) on the metal shell inwall between each pipe thread (2) in the pipe end of metal shell (1) of one casting.

2, plastic steel composite pipe spare as claimed in claim 1 is characterized in that described pipe fitting is elbow or two pass joints or tee union or cross fitting or the flat shape union with footpath and reducing.

3, plastic steel composite pipe spare as claimed in claim 1 is characterized in that the head of plastics lining (2) is shaped on packing ring (6).