Butterfly Valve Roller-Pin Mounting for Vibration Resistance
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Solution Overview
Problem
Butterfly valves in anti-ice systems for gas turbine engines experience vibration issues due to their operational environment, which existing mounts fail to adequately address, leading to potential mechanical instability and performance degradation.
Innovation Solution
The use of bearings with wave springs and shims to mount the roller pin within crank collars, providing a spring bias that resists movement and enhances stability in high vibration conditions, combined with a secure retention system using bolts, nuts, and a locking helical coil insert, to maintain the roller pin's position and prevent excessive movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mounts are used for roller pin bearings, then the structure is simple, but vibration resistance is insufficient leading to mechanical instability
Solution Approach 1:
The patent applies beforehand cushioning by introducing a vibration isolation element (elastomeric material or spring) between the roller pin bearing mount and the crank collar. This cushioning element is pre-installed to absorb and dampen vibrations before they can cause mechanical instability, thereby improving reliability without significantly complicating the overall structure.
Solution Approach 2:
The patent uses an intermediary vibration isolation element (elastomeric material or spring) that mediates between the roller pin bearing and the crank collar. This intermediary component absorbs vibrational energy and prevents direct transmission of vibrations, enhancing vibration resistance while maintaining a relatively simple mount structure.
2Stability of the object's composition
If rigid mounting is used for roller pin, then structural simplicity is maintained, but excessive movement occurs under vibration leading to performance degradation
Solution Approach 1:
The vibration isolation element is pre-installed in the mounting mechanism to provide cushioning before vibrations occur. This element absorbs and dampens vibrational forces, preventing excessive movement of the roller pin and maintaining position stability without requiring a complex active control system.
Solution Approach 2:
The patent changes the mechanical parameters of the mounting system by introducing an elastomeric material or spring with specific damping and stiffness characteristics. This parameter change allows the mount to be compliant under vibration while maintaining rigidity during normal operation, achieving stability without excessive complexity.
3Reliability
If vibration isolation elements are added to the bearing mount, then vibration resistance improves, but manufacturing complexity increases
Solution Approach 1:
The vibration isolation element is designed to be pre-installed or pre-positioned in the mounting structure, allowing for straightforward assembly. The elastomeric material or spring is integrated into the mount design in a way that requires minimal additional manufacturing steps, thereby improving vibration resistance without significantly increasing manufacturing complexity.
Solution Approach 2:
The patent selects vibration isolation elements with standard dimensions and properties that facilitate ease of manufacture and assembly. By carefully selecting the elastomeric material or spring parameters, the design achieves effective vibration isolation while maintaining compatibility with conventional manufacturing and assembly processes.
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
This configuration effectively reduces the impact of vibrations on the butterfly valve, ensuring stable operation and prolonged mechanical integrity by limiting the movement of inner races and maintaining the roller pin's position, thus enhancing the reliability of the anti-ice system.
Implementation Method 1
The bearings each have an outer race associated with one of the crank collars, an inner race associated with the roller pin, and bearing members separate the inner and outer race. There is a spring bias resisting movement of the inner races relative to said roller pin.
Implementation Method 2
Butterfly valves in anti-ice systems for gas turbine engines experience vibration issues due to their operational environment
Data Source
AI summary
A valve member is mounted on a shaft to pivot within a fluid passage. A control selectively moves a piston in a linear direction to control a position of the valve member in the fluid passage. The piston causes a roller pin to move as the piston moves linearly. The roller pin is mounted in crank collars of a crank shaft such that movement of the roller pin causes the crank collars to rotate crank shaft rotating position, and the valve shaft. The roller pin is mounted within the crank collars by bearings. The bearings each have an outer race associated with a crank collar, an inner race associated with the roller pin, and bearing members separate the inner and outer race. There is a spring bias resisting movement of the inner races relative to said roller pin. An anti-ice system is also disclosed.