Method for sealing air cylinder split

Abstract

The invention discloses a method for sealing an air cylinder split. The method comprises the following steps of (1) determining a deformed and air-leaking clearance area on the air cylinder split; (2) forming an upper half sealing key groove in the upper half split of a cylinder body of the determined area, and forming a lower half sealing key groove in the lower half split of the cylinder body of the determined area, wherein the upper half sealing key groove in the upper half split of the cylinder body corresponds to the lower half sealing key groove in the lower half split of the cylinder body in a way that the sky corresponds to the ground; and (3) selecting a material to make sealing keys, wherein the linear expansion coefficient of the material is higher than that of the air cylinder and is anisotropic, and mounting the manufactured sealing keys in the sealing key grooves which correspond to each other in the way that the sky corresponds to the ground on the split of the air cylinder in the step (2), so that the anisotropic heat-expanded sealing keys of which the linear expansion coefficient is higher than that of the air cylinder seal deformed and air-leaking clearances in the split of the air cylinder. The sealing keys effectively and reliably seal the deformed and air-leaking clearances in the split of the air cylinder, and the sealing reliability is high.

Description

technical field [0001] The invention relates to a cylinder of a steam turbine, in particular to a face sealing method in the cylinder. Background technique [0002] Steam turbine is an external combustion rotary machine that converts steam heat energy into mechanical work. It has been widely used in thermal power, nuclear power and other power stations and ships and other equipment. The work efficiency and operation stability of the steam turbine depend to a large extent on the sealing performance of the steam turbine cylinder. Since the steam turbine usually operates in the environment of high temperature, high pressure and high speed, the cylinder will be linear after being heated. Thermal expansion (various materials have different degrees of linear thermal expansion after being heated, and the same material has a large difference in linear expansion due to different structures and working environments), which in turn leads to structural warping of the cylinder , so that...

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Problems solved by technology

The work efficiency and operation stability of the steam turbine depend to a large extent on the sealing performance of the steam turbine cylinder. Since the steam turbine usually operates in the environment of high temperature, high pressure and high speed, the cylinder will be linear after being heated. Thermal expansion (various materials have different degrees of linear thermal expansion after being heated, and the same material has a large difference in linear expansion due to different structures and working environments), which in turn leads to structural warping of the cylinder , so that the sealing structure of the upper half of the cylinder block and the middle split surface of the lower half of the cylinder body is eliminated, even if a larger locking force is applied to the locking bolts at the middle split surface of the upper half of the cylinder block and the lower half of the cylinder block, It is also impossible to restore the sealing structure at the middle parting surface of the upper half of the cylinder block and the lower half of the cylinder block to form a wedge-shaped gap. The production cost of the enterprise, and the leakage of a large amount of steam will also affect the stability of the steam turbine, thereby increasing potential safety hazards

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