Cast steel gland seals and cast steel oil baffles
Cast steel gland seals and cast steel oil baffles are core components of the steam turbine shaft sealing system. They are widely applied in thermal power generating units, boiler feed pump small turbines, and industrial steam turbines for petrochemical and metallurgical industries. Manufactured integrally from high-quality alloy cast steel, these parts outperform ordinary cast iron, welded and forged components. They adapt to severe operating conditions of turbines, including high temperature, high pressure, alternating thermal stress and continuous high-frequency vibration. As key turbine components, cast steel gland seal bodies and oil baffle bodies ensure reliable sealing performance, stable unit operation and improved power generation efficiency.
Cast Steel Gland Seal
The cast steel gland seal is a vital sealing component for turbine flow passages. It adopts a split upper-and-lower cast steel structure with multi-stage labyrinth cavities integrally cast inside and equipped with inlaid sealing teeth. It is mainly installed at the shaft ends, diaphragms and balance pistons of turbine high-pressure, medium-pressure and low-pressure cylinders.
Core functions: By multi-stage throttling and pressure reduction, it minimizes the pressure difference inside and outside the cylinder and effectively reduces high-temperature and high-pressure steam leakage, lowering unit heat loss. For low-pressure cylinder operation, it prevents external air ingress and maintains condenser vacuum to guarantee power generation efficiency. In addition, it isolates high-temperature steam from entering the bearing housing, avoiding emulsification and deterioration of lubricating oil and ensuring stable operation of the shaft lubrication system.
Cast Steel Oil Baffle
The cast steel oil baffle is a dedicated sealing component for turbine bearing housings. It features a split annular cast steel structure with integrally cast oil return grooves, oil storage cavities and labyrinth oil-blocking structures. It is installed at the dynamic-static junction where the rotor shaft penetrates the bearing housing, adjacent to the shaft gland area.
Core functions: It provides two-way isolation protection. On the one hand, it blocks splashing and leakage of lubricating oil caused by high-speed bearing operation, eliminating oil leakage and oil-gas escape to reduce oil consumption and on-site pollution. On the other hand, it prevents high-temperature steam, moisture and dust impurities from entering the bearing housing, maintaining the cleanliness of lubricating oil and protecting precision components such as bearings and rotors. Some advanced models adopt retractable inner ring structures to adapt to rotor eccentricity and maintain stable sealing clearance under variable operating conditions.
Core Advantages of Cast Steel Material
Compared with cast iron, welded parts and ordinary plate components, cast steel gland seals and oil baffles show prominent advantages under severe turbine operating conditions and are suitable for long-term continuous unit operation:
High temperature resistance and creep resistance with stable performance:
Adopting premium alloy cast steel , the material delivers excellent high-temperature strength. It resists plastic deformation and cracking under high-temperature and high-pressure steam environments and frequent start-stop thermal cycles, maintaining stable sealing clearance and long-lasting sealing performance.
Integral casting with high structural adaptability:
The casting process enables one-piece forming of complex labyrinth cavities, oil return grooves, mounting flanges and bolt holes. It reduces welding procedures, minimizes weld defects and welding deformation risks, and perfectly matches the complex structural design of turbine sealing systems.
Vibration and impact resistance with high operational reliability:
Cast steel features balanced strength and toughness. It withstands unit operating vibration, minor rotor rubbing and alternating mechanical stress without brittle fracture, adapting to high-vibration working conditions of large-power and industrial turbines.
Excellent repairability and low operation cost:
The material possesses superior weldability. Local wear and damage can be repaired by on-site welding and surfacing during unit overhaul, avoiding overall component replacement and greatly reducing spare parts and operation and maintenance costs.
Superior corrosion and oxidation resistance for extended service life:
Under mixed operating conditions of high-temperature steam and oil gas, cast steel outperforms cast iron in oxidation and medium erosion resistance. It avoids matrix rusting and peeling, prevents impurities from entering flow passages and lubrication systems, and prolongs the service life of turbine equipment.
Matched thermal expansion with high compatibility:
The thermal expansion coefficient of cast steel is well matched with turbine casings and bearing housings. The controllable expansion difference during temperature rise and fall effectively prevents component jamming and sudden changes of sealing clearance.
Main Application Scenarios
Large-scale thermal power main units:
Suitable for steam turbine generator sets, with a focus on high and medium pressure cylinder shaft end seals, diaphragm seals, and shaft seal side bearing oil seals.
Auxiliary small steam turbines for power stations:
Adapted for boiler feed pump driving turbines, coping with frequent start-stop, large vibration amplitude and fluctuating operating conditions.
Industrial driving steam turbines:
Widely used in petrochemical, refining and metallurgical industries for turbines driving compressors and pumps, applicable to long-term uninterrupted and complex industrial operating scenarios.
Spare parts for unit overhaul and renovation:
Perfectly matching the installation dimensions of original equipment for upgrading and overhauling old turbine units, solving common problems of traditional cast iron parts such as deformation, oil leakage, steam leakage and insufficient vacuum.
Hot Tags: turbine equipment components: gland seal and oil baffle, China turbine equipment components: gland seal and oil baffle manufacturers, suppliers, factory
