Making method of labyrinth core bag in labyrinth regulating valve

Abstract

The invention discloses a making method of a labyrinth core bag in a labyrinth regulating valve. The labyrinth core bag is of an integral structure which is composed of multiple labyrinth disc pieces which are stacked and bonded, and a brazing layer is arranged between the adjacent labyrinth disc pieces; when the labyrinth core bag is made, the labyrinth disc pieces and the labyrinth disc pieces are stacked on a clamping assembly in an overlapping manner, and a gravity block compact the uppermost clamping assembly so as to heat in a vacuum furnace; and the melting brazing layers are used for bonding the labyrinth disc pieces together so as to form the labyrinth core bag under the gravity compensation of the gravity block. The making method provided by the invention adopts gravity compensation, the gravity block can uniformly compact the labyrinth disc pieces under the guide of a gravity block guide rails, even if the brazing material has a definite pressing force under the high temperature fusing state, and therefore, the labyrinth disc pieces are well fused, and the quality of products is greatly improved.

Description

technical field [0001] The invention relates to mechanical manufacturing, in particular to a manufacturing process of a labyrinth core bag in a regulating valve. Background technique [0002] The regulating valve is a very critical hardware device in the field of automatic control, which is directly responsible for the control and regulation of the system medium. Due to the different characteristics of various media, some media will damage the regulating valve, especially the regulating valve with high pressure difference. The control is very difficult, and the valve scour is very serious, especially for the control of soda water, there will be two-phase flow phenomenon, resulting in cavitation, the greater the pressure difference, the more serious the cavitation, the previous valves generally use window adjustment, the pressure difference is large The multi-level adjustment method is adopted, but it will still cause great damage to the valve, the noise is loud, and the ...

AI Technical Summary

Problems solved by technology

This way of using the mandrel and thread compression, because the intermediate brazing material starts to flow at high temperature, the compensation effect of thread compression is very small, which will cause some labyrinth discs to be not well combined.

The key reason is that the brazing layer between the discs will flow after being heated, and the entire disc will be pressed by bolts. After the brazing layer melts, there will be no pressing force, resulting in some discs not being connected well and reducing their strength.

Later, springs were used for compression. Since the brazing of the labyrinth disks is completed under a vacuum of 1000°C, the springs will fail soon. However, the quality of the disks made according to the above method is not very good, which is reflected in the difficulty of quality control and Low yield

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