Airtight steam preventing device for turbine

Abstract

The invention discloses an airtight steam preventing device for a turbine. The airtight steam preventing device for the turbine comprises a steam preventing piece, a nozzle assembly, a steam preventing assembly and a sealing wind air source system, wherein the steam preventing piece, the nozzle assembly and the steam preventing assembly are arranged on a turbine rotor in a sleeving manner, and thesealing wind air source system can blow wind to the turbine rotor. The nozzle assembly is located above the steam preventing piece and comprises two spray sets, each spray set comprises a semi-ring-shaped body and a channel communicating with the semi-ring-shaped body. Multiple air outlet holes are formed in each semi-ring-shaped body, the two semi-ring-shaped bodies are oppositely arranged to form a ring shape, and the two channels are oppositely arranged. The steam preventing assembly comprises an electromagnetic valve, a buffering tank, a heater, a pressure reducing valve and an isolationvalve, and the electromagnetic valve, the buffering tank, the heater, the pressure reducing valve and the isolation valve are sequentially arranged in the direction of gradually getting away from theturbine rotor. The sealing wind air source system is located on the outer side of the isolation valve and is connected with the isolation valve. The airtight steam preventing device is convenient to install and maintain, compressed air blown by the sealing wind air source system is used for forming an air curtain on the turbine rotor, an original steam flow leaking channel is sealed, and the problem that steam leaks into a bearing box is solved.

Description

technical field [0001] The invention relates to the technical field of steam turbines, in particular to an airtight steam blocking device for steam turbines which prevents steam from leaking into a bearing box and has better sealing effect. Background technique [0002] The steam baffle used in the existing steam turbine unit adopts a single-layer aluminum ring structure, and is fixed on the side of the bearing box through a bolt assembly, which plays a role in preventing the leaking steam from the shaft seal from entering the bearing box. [0003] In order to prevent the friction between the steam baffle and the rotor of the steam turbine, there is a gap of 4-5 mm between the steam baffle and the rotor on the existing steam turbine, which cannot completely prevent the leaking steam from the shaft seal from entering the bearing box; The thermal radiation of the lubricant is prone to deformation, the gap with the rotor is further increased, the steam resistance effect is furt...

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Problems solved by technology

[0003] In order to prevent the friction between the steam baffle and the rotor of the steam turbine, there is a gap of 4-5 mm between the steam baffle and the rotor on the existing steam turbine, which cannot completely prevent the leaking steam from the shaft seal from entering the bearing box; The thermal radiation of the heat radiation is easy to produce deformation, the gap between the rotor and the rotor is further increased, the steam resistance effect is further reduced, and finally the problem of water content in the lubricating oil exceeding the standard will appear

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