Generator Hydrogen Sealing Ring Bearing
Generator Seal Ring Bearing play a significant, multi-faceted role in hydrogen-cooled generator sets such as QFQS-200-2, QFSN-350-2-20, acting as a primary line of defense against critical operational hazards.
1. Functions of Sealing Ring Bearing
The main functions of these sealing rings are critical for maintaining the safety, cooling efficiency, and service life of the generator:
- Preventing Hydrogen Leaks: The seal ring maintains a stable oil film between the rotating shaft and stationary components, effectively preventing the highly flammable and explosive internal hydrogen gas from leaking out. A hydrogen leak could lead to a serious accident.
- Preventing Air Ingress: Seal rings prevent external air from entering the generator. If air mixes with internal hydrogen, it drastically decreases hydrogen purity, reducing the generator's cooling efficiency and posing a serious explosion risk.
- Maintaining Hydrogen Pressure Stability: Through their reliable sealing performance, seal rings help maintain the stable internal hydrogen pressure, which is essential for effective cooling and the generator's normal operation.
- Lubrication and Cooling: Beyond sealing, the oil film mechanism inherently provides lubrication and cooling to the seal ring itself and the rotating shaft, significantly reducing mechanical wear and extending the equipment's service life.
2. Application Locations of Sealing Bearing
Sealing bearings are strategically positioned at both ends of the generator shaft, with a distinct dual-part configuration:
- Turbine End and Exciter End: Seal rings are installed at both the turbine end and the exciter end of the generator. These locations are the critical interfaces where the shaft penetrates the housing, and the rings work to prevent both air ingress and internal hydrogen leakage.
- Hydrogen Side and Air Side: At each end, the seal ring assembly is divided into two parts:
- The hydrogen-side ring is in direct contact with the internal high-purity hydrogen.
- The air-side ring is in contact with the external ambient air.
3. Installation Precautions for Seal Rings
Proper installation and system commissioning are essential for the long-term effectiveness of the seal rings:
- Adjusting Seal Ring Clearance: The gap (clearance) between the seal ring and the rotating shaft must be strictly adjusted according to design specifications. A gap that is too large will lead to poor sealing, while one that is too small can cause severe mechanical wear.
- Debugging the Seal Oil System: After installation, the seal oil system must be meticulously debugged. It is imperative to ensure that the oil pressure on both the hydrogen side and the air side is balanced and consistently higher than the hydrogen pressure inside the generator.
- Cleaning and Inspection: Before beginning installation, the seal ring must be thoroughly cleaned to remove any impurities. The ring must also be inspected for any signs of damage or wear prior to placement.
- Securing the Seal Ring: The ring must be securely installed on the generator end cover, typically using bolts and locating pins, to prevent any operational displacement.
- Lubrication and Cooling System Check: Ensure that the seal ring's lubrication and cooling system is fully functional during installation. This includes checking that all components, such as oil pumps, filters, and coolers, are correctly installed and connected.
Precision Engineered: Custom Seal Ring Bearing Manufacturing
Your generator's performance hinges on a perfect seal. If standard rings fail to meet your unit's specific dimensions, pressure ratings, or material requirements, we offer expert custom manufacturing.
We specialize in producing high-tolerance seal rings from advanced materials engineered to resist wear, maintain film stability, and ensure zero-leak performance in non-standard shaft sizes or extreme operating conditions.
