Molten steel vacuum refining top gun

Abstract

The invention discloses a molten steel vacuum refining top gun which comprises a center pipe, an inner pipe arranged outside the center pipe and used for inputting cooling water, an outer pipe arranged outside the inner pipe and used for outputting the cooling water, an intermediate pipe matched and connected with the inner pipe, and a nozzle matched and connected with the center pipe and the outer pipe, wherein at least one surface of the outer side of the nozzle is a tapered surface. According to the invention, the flowing speed of the cooling water of the nozzle is increased, and the cooling is enhanced so that the service life is prolonged. The nozzle is designed into a tapered shape, thus the flow acceleration is facilitated, slag is bonded in a blowing process, bonded slag automatically drops under the action of the gravity, the service life of the nozzle is prolonged, the labor efficiency is increased, and the labor intensity of an operator is lowered.

Description

technical field [0001] The invention relates to a top gun for vacuum refining of molten steel. Background technique [0002] Liquid steel vacuum refining top gun is a kind of baking gun used on steelmaking furnaces. It is an important mechanical equipment for molten steel vacuum refining (RH method). And spray CaF2 and other RH aspects. [0003] At present, the internal structure of the top gun used in domestic metallurgical equipment is as follows: figure 1 As shown, it is composed of a main body pipe, a transitional connecting pipe and a copper nozzle 9, wherein the main body pipe is a casing structure, which includes: a central pipe 1, an inner pipe 2, a middle inner pipe 3, and an outer pipe 4; and the transitional connection The tubes are correspondingly welded between the main body tube and the copper nozzle 9, and from the inside to the outside are respectively: the transition central tube 5, the transition inner tube 6, the transition inner tube 7, and the transiti...

AI Technical Summary

Problems solved by technology

In addition, because the top gun must be cooled by cooling water, but due to the limitation of the head structure of the traditional top gun, the pressure loss at the corner of the cooling water inlet and outlet is relatively large, resulting in a sharp drop in the speed of the cooling water. Due to the high frequency of use of the top gun In addition, the working environment is relatively harsh, such as high temperature and vacuum conditions, the top gun, especially the nozzle part, is easily damaged due to high temperature, and the service life is greatly reduced. Generally, the nozzle will be partially burned after five or six months of use.

[0004] In addition, the end of the nozzle is relatively flat, and the splashed steel slag is also easy to stick to the end of the nozzle, which greatly reduces the heat dissipation of the nozzle and shortens the service life

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