Nonuniform heating enclosed method in large-sized high-pressure bottle heat sleeve stove

Abstract

The invention relates to an in-furnace non-uniform heating shrink fit method of a large high pressure vessel shrink fit barrel; the outside of an inner barrel and the inside of an outer barrel are firstly processed, and the upper and lower ends of the outer barrel are symmetrically drilled with exhaust vents; a face flange is mounted at the bottom of a pit furnace; the outer barrel is lifted into the furnace and placed on the face flange; the outer barrel is heated by the furnace, the temperature of the outer barrel is controlled to be 380-450DEG C from top to bottom, and the temperature is kept for 1-2h; the inner barrel is directly sheathed in the outer barrel in the furnace and when the temperature in the furnace drops to below or equal to 80 DEG C, the shrink fit of the inner and outer barrels is completed. As the invention adopts the in-furnace shrink fit mode, the situations of blockage and incapability to sheathe due to the excessive shrinking of the outer barrel caused by excessively quick temperature reduction outside the furnace can be avoided; the outer barrel forms trapezoid linear structure which is large at the bottom and small at the top by non-uniform heating; if the inner barrel can enter successfully, the shrink fit can be carried out smoothly due to relatively large swelling amount at the lower end, thus improving the shrink fit efficiency.

Description

technical field [0001] The invention relates to a fitting method of a heat sleeve body of a large high-pressure vessel, in particular to a fitting method of a heat sleeve body of a large high-pressure vessel made of a low-alloy steel plate. Background technique [0002] Low-alloy steel plate is the main steel plate for manufacturing high-pressure vessels in my country at present. It is characterized by high strength and good toughness, and is commonly used in the production of heat-shrinked high-pressure vessels. The heat sleeve generally uses the outer cylinder to be evenly heated to a certain temperature, and when it reaches the fitting gap, it is inserted into the inner cylinder. This method is relatively common, but it often causes horizontal displacement due to shaking when the outer cylinder is lifted out of the furnace for fitting. And due to the rapid drop in temperature of the outer cylinder, the instability in the vertical direction causes fitting difficulties, som...

AI Technical Summary

Problems solved by technology

The heat sleeve generally uses the outer cylinder to be evenly heated to a certain temperature, and when it reaches the fitting gap, it is inserted into the inner cylinder. This method is relatively common, but it often causes horizontal displacement due to shaking when the outer cylinder is lifted out of the furnace for fitting. And due to the rapid drop in temperature of the outer cylinder, the instability in the vertical direction causes fitting difficulties, sometimes resulting in fitting failures requiring rework

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