Lead Bronze Shaft Seal Ring for Hydrogen Generator Emergency Sealing
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Solution Overview
Problem
Existing shaft sealing rings for hydrogen-cooled generators face challenges in emergency running situations, where materials like bronze and white metal suffer damage, leading to leakage and reduced service life, and bonding defects occur with layered white metal solutions.
Innovation Solution
A shaft sealing ring made of lead bronze material with circumferential grooves and axial lubricating grooves is used, providing excellent sliding properties, high strength, and eliminating the need for additional metal layers, thus preventing damage and bonding errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bronze shaft sealing ring is used, then high strength is achieved, but damage to the shaft surface occurs in emergency situations
Solution Approach 1:
The invention uses a composite structure consisting of a bronze support body and a white metal layer. The bronze support body provides high strength and structural integrity, while the white metal layer provides low friction and protects the shaft surface during emergency running situations. This composite material approach resolves the contradiction by combining materials with complementary properties.
2Ease of operation
If a white metal layer is applied to a support body, then sliding properties are improved, but bonding defects occur and the white metal layer can be damaged
Solution Approach 1:
The invention specifies precise compositional parameters for the white metal layer (8-15% tin, 0.5-2% zinc, 0.1-0.5% iron, balance lead) and applies these to a bronze support body. By carefully controlling the material composition and application parameters, the invention achieves reliable bonding between the white metal layer and support body, preventing bonding defects while maintaining the low-friction properties of white metal.
3Ease of operation
If a white metal layer is applied to the support body, then sliding properties improve, but the manufacturing process becomes time-consuming and complex
Solution Approach 1:
The invention defines specific compositional ranges for the white metal layer (8-15% tin, 0.5-2% zinc, 0.1-0.5% iron, balance lead) that can be directly cast onto the bronze support body. This parameter-based approach standardizes the manufacturing process, making it more controllable and less complex while ensuring consistent sliding properties.
4Ease of operation
If a white metal layer is applied to the support body, then sliding properties improve, but additional manufacturing steps and quality examinations are required
Solution Approach 1:
The invention creates a integrated composite structure where the white metal layer and bronze support body are manufactured as a unified component. This approach eliminates the need for separate assembly steps and reduces quality examination requirements, as the composite structure is designed to inherently prevent bonding defects and layer damage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The lead bronze shaft sealing ring offers improved emergency running properties, extended service life, reduced risk of damage, and cost savings by eliminating the need for complex layer applications and ultrasonic examinations.
Implementation Method 1
the shaft sealing ring is made of a lead bronze material... there is advantageously no damage to the surface of the shaft sealing ring and to the surface of the generator shaft due to its good sliding behavior with the generator shaft in emergency running situations
Data Source
Figure 1
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AI summary
A shaft sealing ring (1) for a barrier oil sealing system of a hydrogen-cooled generator is designed in the installed state to bear radially against a generator shaft with its inner running surface and to interact with the generator shaft in a hydrogen-sealing manner when acted upon with a barrier oil, characterized in that the shaft sealing ring (1) is made of a lead bronze material.