Stainless steel plate fin type heat exchanger core body high-temperature brazing jig and manufacturing process thereof

Abstract

The invention relates to a clamp used for high-temperature brazing of a stainless steel plate fin-typed heat exchanger core, which is characterized in that the clamp consists of an upper clamping plate (1), a lower clamping plate (2), a bolt (3), a nut (4) and a pressure vessel (5), wherein, the bolt (3) and the nut (4) are used for clamping the upper clamping plate (1) and the lower clamping plate (2); the core of the stainless steel plate fin-typed heat exchanger is placed between the upper clamping plate (1) and the lower clamping plate (2); the pressure vessel (5) is directly and flatly placed on the upper clamping plate (1); the vessel is internally filled with argon which expands under the high temperature and generates uniform pressure so as to lead the equipment elements of the core to be closely contacted with each other and ensure the welding quality of the core of the fin-typed heat exchanger. The clamp of the invention can meet the manufacture requirement of the core of the stainless steel plate tin-typed heat exchanger, generates uniform pressure under high temperature and greatly improves the qualified rate of the products.

Description

technical field [0001] The invention relates to a jig and its manufacturing process, in particular to a high-temperature brazing jig specially used for brazing the core body of a stainless steel plate-fin heat exchanger and its manufacturing process. Background technique [0002] Plate-fin heat exchanger is a kind of heat exchanger. It has the characteristics of high thermal conductivity, small size, light weight and high strength. It is more and more widely used in petrochemical, atomic energy, nuclear power and other industries. The core of the plate-fin heat exchanger is composed of fins, partitions, seals and deflectors. A metal plate (partition) is placed at the upper and lower ends of the fin, and the two sides are sealed with edge seals to form a basic unit. A solder foil is preset between the separator, the fins and the seal. The melting point of the brazing filler metal is lower than that of the base metal, and the brazing filler metal alloy melts at the brazing t...

AI Technical Summary

Problems solved by technology

At such a high temperature, if a traditional clamp is used, the pre-tightening force of the bolts and springs will be released due to high temperature creep and relaxation, and the clamp will lose its elasticity and be in a "loose" state, resulting in misalignment of assembly components

There is no clamping force after the solder is melted, and the small gap required by the brazing capillary action cannot be maintained between the parts, which affects the welding quality, and causes the product to be "de-soldered", resulting in the scrapping of the product and greatly reducing the yield of the product

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