Novel industrial type gas turbine brush gas seal and manufacturing method thereof

Abstract

A novel industrial type gas turbine brush gas seal is formed in the manner that two symmetrical pressure bearing plates in upright ring shapes are welded at the top ends; brush wire bundles which are closely and evenly arranged are arranged in the middles of each pressure bearing plate body; a sunken cooling groove body is formed in the top end of each pressure bearing plate body; and a flow guiding piece is arranged on one side of the upper portion of the middle of each pressure bearing plate body. The novel industrial type gas turbine brush gas seal effectively reduces the production cost of manufacturers; and because the manner that the brush wire bundles, the pressure bearing plates and the flow guiding pieces are welded as a whole is adopted, the welding deformation of the brush gas seal caused when a welding part is too thin in the welding process is effectively controlled, and meanwhile, the overall strength of the brush gas seal is improved; cooling grooves formed in the pressure bearing plates guarantee the welding convenience, the problem that a sealing piece deforms and loses efficacy due to high temperature can be prevented, and therefore the service life of the sealing piece is prolonged; and meanwhile, the problem that secondary machining is needed because part assembling is difficult is avoided, and machining work procedures are reduced.

Description

technical field [0001] The invention belongs to the field of gas turbine sealing, and in particular relates to a novel industrial gas turbine brush air seal and a manufacturing method thereof. Background technique [0002] During the operation of the gas turbine, especially in the working condition near the critical speed, large vibration will be generated. Therefore, it is necessary to seal the high-temperature gas in the gas turbine. The traditional sealing methods are comb seal and honeycomb seal, but this sealing method is used in gas turbine When the rotor vibrates greatly, it will collide with the sealing teeth or the honeycomb belt, and this wear is permanent and irreversible, and it is easy to cause serious high-temperature gas leakage over time. The existing improvement method is to use a brush air seal. As a flexible seal, the brush air seal will vibrate more when the rotor exceeds the critical speed. Because the brush wire used in the brush seal is elastic, it wil...

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Problems solved by technology

[0003] In order to solve the deficiencies in the prior art, the present invention provides a new type of industrial gas turbine brush gas seal; the new type of industrial gas turbine brush gas seal adopts a vacuum electron beam welding process, which can effectively seal the high temperature gas of the gas turbine and The deformation of the brush wire and the baffle due to welding is well controlled, and the difficulty of secondary processing due to the difficulty of assembly caused by the deformation is avoided; at the same time, in a vacuum state, it can prevent the oxidation of the brush wire during the welding process, prolonging the The life of the brush wire is improved; the structure of the present invention is optimized, and a gas cooling groove is set up on the front and rear pressure plates, which can ensure that when the unit is running, there is an air flow to take away the heat accumulated on the brush wire through the cooling groove, which speeds up the process. The heat dissipation of the components prolongs the service life of the brush wire air seal, and at the same time simplifies the structure, fixing the brush wires, deflectors and front and rear pressure plates on a set of wire arrangement templates

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