Dual-layer air cylinder structure

Abstract

The invention discloses a dual-layer air cylinder structure which comprises an inner cylinder and an outer cylinder, wherein a heat-insulating layer is arranged on the periphery of the inner cylinder; the outline and the shape of the heat-insulating layer correspond to and are matched with the outline and the shape of the inner cylinder. According to the dual-layer air cylinder structure disclosed by the invention, on the premise of not influencing various measurement points of the inner cylinder and the assembly and the disassembly of parts such as a split locking bolt, the heat-insulating layer is arranged on the outer wall of the inner cylinder, so that great cooling formed by low-temperature and low-pressure stream of an interlayer between the inner cylinder and the outer cylinder to the outer wall of the inner cylinder is avoided, further the heat loss of the outer wall of the inner cylinder is reduced, the temperature difference and the pressure difference between the inner wall and the outer wall of the inner cylinder are enabled to approach to each other as much as possible, the thermal deformation opening phenomenon of the inner wall and the outer wall of the inner cylinder due to excessively-great temperature difference and pressure difference is effectively prevented, the manufacturing difficulty of the air cylinder is further reduced, the sealing property of the air cylinder is ensured, the work doing efficiency of a steam turbine is increased, the operation cost of the steam turbine is reduced, the stability of the steam turbine is improved, and reliable and safe operation of a steam turbine set is guaranteed.

Description

technical field [0001] The invention relates to a cylinder working in a high-temperature and high-pressure environment for a long time, in particular to a double-layer cylinder structure. Background technique [0002] A steam turbine is a rotary power mechanical device that converts steam energy into mechanical work. The important component for converting steam energy is the cylinder. The function characteristics of the cylinder determine that it must work in a high temperature and high pressure environment for a long time. In order to meet the high-temperature and high-pressure working environment requirements, the high-pressure cylinder of the steam turbine is usually a double-layer structure, that is, the high-pressure cylinder is mainly composed of an inner cylinder and an outer cylinder covering the inner cylinder, and the high-temperature, high-pressure and high-quality steam in the inner cylinder is used to drive part of the rotor to rotate To do work, the interlayer ...

AI Technical Summary

Problems solved by technology

Due to the large temperature difference and pressure difference between the work steam and the high exhaust steam, this temperature difference and pressure difference will cause a large temperature difference and pressure difference between the inner wall and the outer wall of the inner cylinder, which will easily cause the inner cylinder. The opening deformation from inside to outside due to thermal deformation at the surface will not only cause a large amount of high-temperature and high-pressure high-quality working steam to leak, affect the work efficiency of the steam turbine, increase the operating cost of the steam turbine, but also make the gap between the inner cylinder and the outer cylinder The temperature and pressure of the high-exhaust steam in the interlayer rise (the high-exhaust steam is doped with a large amount of high-temperature and high-pressure high-quality work steam), which in turn causes a large temperature and pressure difference between the inner and outer walls of the outer cylinder, resulting in a split surface in the outer cylinder. Due to thermal deformation, the opening deformation from the inside to the outside occurs, and steam leakage occurs, which will further affect the work efficiency of the steam turbine, increase the operating cost of the steam turbine, and directly affect the stability of the steam turbine, posing a great safety hazard

What's more, the thickness of the flange at the middle facet of the cylinder (including the inner cylinder and the outer cylinder) is 3 to 4 times the thickness of the cylinder wall, so under the influence of working steam and high exhaust steam, the inner wall of the flange at the middle facet of the cylinder The temperature difference and pressure difference between the outer wall and the outer wall will be further increased, so that the risk of opening due to thermal deformation at the split surface in the cylinder will be further aggravated

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