Pipe expansion tool and maintenance method for steam turbine maintenance

Abstract

The invention discloses a pipeline expansion tool and a maintenance method for steam turbine maintenance. The expansion tool is used in a hollow pipeline, and the expansion tool can expand the hard part and the soft part of the hollow pipeline; the expansion tool includes : a cylinder as a total support, capable of expanding its own radial expansion; the cylinder extends along the transverse length and it is a hollow structure, the cylinder has a first end and a second end opposite to the opening, the first end There is a straight line communication between the first end and the second end; the expansion part is arranged outside the first end; the expansion of the hollow pipe is carried out in steps by using the expansion tool, which reduces the instantaneous stress and realizes the push-up in the step-by-step push The control of the resisting force and the resisting range, so that the resisting is uniform, the hollow pipe will not be damaged, and the deformation of the hollow pipe after being resisted is small, and the uniform expansion can be realized.

Description

technical field [0001] The invention relates to the technical field of steam turbines, in particular to a pipeline expansion tool and a maintenance method for steam turbine maintenance. Background technique [0002] The steam turbine, also known as the steam turbine engine, is a rotary steam power device. The high-temperature and high-pressure steam passes through the fixed nozzle to become an accelerated air flow and then sprays onto the blades, so that the rotor equipped with blade rows rotates and works externally. The steam turbine is the main equipment of modern thermal power plants, and is also used in the metallurgical industry, chemical industry, and ship power plant. The steam turbine has multiple key pipelines, such as: the main steam pipeline, which is the outlet header of the superheater to the high-pressure main steam valve interface The high-temperature and high-pressure steam pipes (hard pipes) between them; the main water supply pipes are the high-pressure bo...

AI Technical Summary

Problems solved by technology

The steam turbine is the main equipment of modern thermal power plants, and is also used in the metallurgical industry, chemical industry, and ship power plant. The steam turbine has multiple key pipelines, such as: the main steam pipeline, which is the outlet header of the superheater to the high-pressure main steam valve interface The high-temperature and high-pressure steam pipes (hard pipes) between them; the main water supply pipes are the high-pressure boiler water supply pipes (soft pipes) between the outlet of the electric feed water pump and the inlet header of the economizer; Regular maintenance is required after use. However, due to the fixed diameter of the pipe orifice, some tools cannot enter it due to size restrictions. The existing expansion tools directly apply the expansion force to the side wall of the pipe, which causes relatively large damage to the side wall of the pipe. , In addition, this force leads to uneven expansion of the pipeline, and excessive damage after expansion is difficult to recover, and this expansion method can only deal with hard pipelines, and it will cause pipeline damage when facing soft pipelines

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