Non-welding flange-connection stainless steel metal flexible pipe and production method

Abstract

The invention relates to a weldless stainless metallic hose and a manufacture method thereof. The middle part of the stainless metallic hose is processed to be a corrugated segment and the two ends are processed to be a straight pipe segment. A stainless metal soft net is tightly pressed and fixed by an internal ring and an external ring, which are arranged outside the stainless metallic hose, and then is rung with a nut and a gasket. The end part of the straight pipe segment is pressed to be a plane. After a gland bush is arranged on the plane, a screwed nipple is screwed on, which forms a flare connection. The invention has the beneficial effects of erosion resistance and shock resistance. The invention applies to the situations with high frequency and short arc. The heat treatment of solid melting improves the corrosion resistant capability; therefore the invention is applicable to the situation with high density of chloridion. With the flare connection, the invention can be processed to be threads of various standards and can be connected with the user pipeline flexibly. With the soft connection, the filed tubing is simplified and the working efficiency is improved. The metallic hose can be the deformation absorption of various equipments and pipelines.

Description

technical field [0001] The invention belongs to a threaded joint of water and gas pipelines and a manufacturing method thereof, in particular to a non-welded stainless steel metal hose and a manufacturing method thereof. Background technique [0002] As we all know, with the rapid development of my country's economy, various requirements such as high-efficiency pipeline construction, flexible piping methods, solutions to various displacements of pipelines, thermal expansion and contraction of pipelines, and corrosion of pipelines are constantly increasing. Therefore, manufacturers of various pipeline components continue to increase investment in scientific research, and products suitable for various pipeline connections are also constantly innovating and developing. For example, the most common hoses on the market are PTFE hoses, aluminum-plastic hoses, rubber hoses and other non-metallic materials. Although the above-mentioned hoses have their own advantages, they all have...

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Problems solved by technology

Although the above-mentioned hoses have their own advantages, they all have their own fatal weaknesses. Among them, the material of the PTFE hose is expensive and the cost is high. Generally, it can only be used in an environment below 180 degrees Celsius; It is easy to crack when it is bent a lot, and it is not flexible. It is used at high temperature, and its service life is significantly shortened; while rubber tubes are prone to aging, especially in high temperature and open-air sunshine environments, and their service life is significantly shortened. In the environment, such as the cooling system of the continuous casting machine of the steel plant and the ladle furnace, due to the extremely harsh operating environment, the hose made of non-metallic materials is very likely to be scalded by high-temperature splashes such as splashed steel slag, resulting in failure of the cooling system; With the increasing number of imported equipment, there are more and more pipes with various standard threaded connections, which also requires the products of pipe component manufacturers to be flexible.

In addition, since the stainless steel metal hoses produced by many manufacturers currently use welding to connect the stainless steel metal hoses to the pipe fittings, although this structure is relatively simple to manufacture, it is subject to many restrictions in actual use. In the road, the welding joint is easy to crack and cause leakage; in some specific environments, the welding joint is prone to corrosion and leakage; due to cold working and welding, in hoses that have not undergone solid fusion heat treatment, the chloride ion content is relatively high In high liquid pipelines, it is easy to cause pitting corrosion and leakage

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