Structure and packaging method of a stainless steel pipe sealing joint

Abstract

The invention belongs to the technical field of stainless steel pipe sealing and relates to a stainless steel pipe sealing joint structure and a packaging method. The stainless steel pipe sealing joint structure comprises a cap, an adaptor and a stainless steel pipe; the adaptor structure belongs to shaft sleeve type parts; one end of the adaptor is a to-be-packaged end face, and the end face of the other end of the adaptor is provided with a welding seam allowance; the outer circle is provided with a step circle to be matched with the end face of the cap; a center hole is matched with the stainless steel pipe; the single face of the matching interval between the center hole and the stainless steel pipe is not greater than 0.1 mm; and during assembly, one end of the adaptor is inserted into the cap to be limited by the step circle. Four processes of flattening, ball ignition, flame brazing and laser welding are adopted, it is ensured that the joint leakage rate is not greater than 0.2*10<-10> Pa.m<3> / s, a product normally gives an alarm when in flame of 1100 DEG C for 5 minutes, and the corrosion resistance grade meets the GJB150A three proofings and acid atmosphere environment. The structural design ensures high reliability of wire fire detector products.

Description

technical field [0001] The invention belongs to the technical field of stainless steel pipe sealing, and relates to a structure and a packaging method of a stainless steel pipe sealing joint. Background technique [0002] The reliable encapsulation of the sealing pipe joint of the line type fire alarm detector is a key technology to ensure the realization of the product function, and the leakage rate of the end is required to be no more than 0.2×10 -10 Pa·m 3 / s, keep for 5 minutes in the 1100°C flame, the product will give a normal alarm, and the corrosion resistance level meets GJB150A three-proof and acidic atmospheric environment. At present, there are no relevant research and engineering application cases in China, and there is no corresponding process reference. Contents of the invention [0003] The object of the present invention is to propose a joint design and realization path for stainless steel pipes with sealing, high corrosion resistance and high service te...

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Problems solved by technology

At present, there are no relevant research and engineering application cases in China, and there is no corresponding process reference

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