H-shaped sealing device for split of small steam turbine of water feeding pump of thermal power plant

Abstract

The invention discloses an H-shaped sealing device for a split of a small steam turbine of a water feeding pump of a thermal power plant, and relates to the field of water feed pump steam turbines. The H-shaped sealing device comprises a main body, a steam exhaust chamber is formed in the position, close to the corner, in the main body, a steam inlet chamber is formed in the position, close to the middle, in the main body, and steam inlet side walls are arranged at the two sides of the steam inlet chamber; and steam exhaust side walls are arranged at the positions, close to the two sides, of the side wall of the steam exhaust chamber, sealing mechanisms are arranged on the steam inlet side walls and the steam exhaust side walls, each sealing mechanism comprises a vertical groove, and a transverse groove is formed in the position, close to one side of the corresponding vertical groove, of the surface of each of the steam inlet side walls and the steam exhaust side walls. According to the H-shaped sealing device, the leakproofness of the split of the small steam turbine of the water feeding pump can be improved, blocking of vacuum leakage caused by long-term gluing is avoided, the safety and reliability of equipment are improved, the treatment cost of a vacuum system can be saved, a limiting strip can be conveniently installed and clamped, and the sealing strip can be stably arranged in an H-shaped sealing groove.

Description

technical field [0001] The invention relates to the field of steam turbines for feedwater pumps, in particular to a split-surface H-shaped sealing device for small steam turbines for feedwater pumps in thermal power plants. Background technique [0002] The feed water pump turbine refers to the steam turbine that drives the feed water pump, which is different from the main steam turbine. The feedwater pump turbine is one of the main components of the thermal cycle system of the power station, especially in the high-parameter and large-capacity ultra-supercritical units. Its safe and reliable operation directly affects the operation of the entire power station equipment, because of its safety and reliability. There are very high requirements in performance, automation level, load adaptability, etc. Only a few companies in the world can design and manufacture million-kilowatt unit feedwater pump turbines. [0003] In the thermal power plant feed water pump and small steam tur...

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Problems solved by technology

[0003] Generally, there are only U-shaped sealing grooves in the small steam turbines of thermal power plant feed water pumps on the market, and the material of the sealing strips is fluororubber sealing strips, and the working temperature here is more than 300 degrees, which leads to the aging and failure of the sealing strips, and the sealing strips The installation is more troublesome, for this reason, we propose a split H-type sealing device in the small steam turbine of the feed water pump of the thermal power plant

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