Quality Control of Vacuum Brazing of Plate Heat Exchangers
Vacuum brazing technology is applied late in China. Since the 1970s, China has made great progress in the use and development of vacuum brazing technology.With the development of modern aviation, aerospace and electronics industries, the emergence and application of many new superalloys, the advantages of vacuum brazing technology will be more and more widely used in the industrial field.
Brazed plate heat exchanger is a new type of special pressure vessel in China. Its design and manufacture are in accordance with the regulations of industrialized countries such as the United States and Japan.
In order to be in line with the international market, China is also actively working on this aspect.Structural characteristics Increasing the heat transfer area is the main means to enhance the heat transfer effect, but increasing the heat transfer area should not be achieved by simply increasing the external dimensions of the equipment, but it should be considered from the structural characteristics of the equipment to improve its compactness.
Since the thinner the steel plate, the better the heat exchange effect, the ultra-thin plate structure is the most ideal. Plate heat exchangers are much more advanced than shell-and-tube heat exchangers in terms of heat transfer efficiency, compactness, unit heat exchange area, and metal consumption.
Detachable plate heat exchangers are inferior to shell and tube heat exchangers in terms of sealing and pressure bearing performance.The use of brazing methods in the manufacture of brazed plate heat exchangers in large vacuum furnaces overcomes the shortcomings of the detachable plate heat exchangers for poor sealing and pressure bearing performance, and has all the advantages of plate heat exchangers.The basic structure of a brazed plate heat exchanger is a flow of a plurality of corrugated grooves (constituting a heat exchange medium passage) designed in opposite directions.