Production process of high strength self-sealing composite aluminium-plastic pipe union

Abstract

The present invention is production process of high strength self-sealing composite aluminum-plastic pipe union. The production process includes producing main pipe union body and auxiliary parts, and has the specific steps of: 1. selecting stainless steel for producing pipe union; 2. machining at least one external thread on the main pipe union body, forming conic sealing stage of 3-7 deg cone apex angle, and forming end port with outer diameter greater than the inner diameter by up to 1.5 mm and height between the inner diameter and the outer diameter of the composite pipe; and 3. machining one locking stage comprising inner conic surface and outer conic surface on one end of the locking nut, with the locking stage possessing inner surface of the same cone apex angle as the outer surface of the sealing stage.

Description

technical field [0001] The invention relates to the manufacturing technology of connecting pipe fittings of aluminum-plastic composite pipes, in particular to a manufacturing method of pipe joints of aluminum-plastic composite pipes capable of realizing high-strength connection and self-sealing effect. Background technique [0002] More than ten years of application development process and domestic and foreign application practice have proved that aluminum-plastic composite pipes have obvious advantages in performance and price as small-diameter indoor pipes, and have remarkable characteristics of anti-rust and anti-corrosion. However, the defects of the existing composite pipe connecting pipe fittings have greatly hindered its popularization and application. [0003] The first generation of ferrule-type copper pipe joints achieves the purpose of sealing by turning the nut and pressing the split ring. After 1997, the second generation of crimping copper joints began to appe...

AI Technical Summary

Problems solved by technology

However, it still cannot accurately grasp the proper pre-tightening force during the connection operation, and it cannot avoid damage to the sealing parts during the connection process, which directly affects the quality and aging of the seal.

Moreover, the mixed use of copper and aluminum is more prone to electrochemical reactions and corrosion, so it cannot be used in green pipelines with corrosion and high water quality requirements, such as gas, chemical, pharmaceutical and other pipeline systems. There are greater restrictions; the production cost is relatively high high

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