Wind Generator Impeller Locking Pin for Radial Misalignment
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Solution Overview
Problem
Current rotor locking devices for wind generators face challenges in aligning and locking the rotor due to manufacturing and installation errors, leading to radial errors and potential deformation or sticking of the locking pin, which increases maintenance costs and downtime, and can damage main bearings.
Innovation Solution
A rotor locking device with a radial clearance between the locking pin and hole, and a limiting device to prevent circumferential rotation, allowing successful locking even with radial deflection and eliminating deformation risks, thus simplifying installation and reducing bearing load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the locking pin is designed to fit tightly into the locking hole to ensure secure locking, then the locking reliability is improved, but manufacturing and installation errors cause radial misalignment leading to deformation or sticking of the locking pin
Solution Approach 1:
The patent changes the geometric parameters of the locking pin by designing it with a tapered structure instead of a cylindrical one. The taper angle is specifically designed to accommodate radial misalignment while maintaining locking effectiveness. This parameter change allows the locking pin to self-align and compensate for manufacturing and installation errors without deforming or sticking.
Solution Approach 2:
The locking pin is designed with dynamic adjustment capability through its tapered geometry. During the locking process, the locking pin can rotate and adjust its angular position dynamically to achieve proper alignment with the locking hole, transforming a static alignment problem into a dynamic self-adjustment process that tolerates initial misalignment.
2Reliability
If the locking pin is pushed forcefully into the locking hole to ensure proper engagement, then the locking effectiveness is improved, but the locking pin suffers from large lateral force causing deformation
Solution Approach 1:
The tapered geometry of the locking pin changes the force distribution parameters during insertion. Instead of concentrating lateral forces at a single point as with a cylindrical pin, the taper distributes the insertion force along the conical surface, reducing peak stresses and preventing deformation while maintaining effective engagement.
3Reliability
If the locking pin gets stuck due to misalignment or deformation, then the rotor cannot be unlocked, but disassembly is very difficult and takes several days increasing maintenance cost and downtime
Solution Approach 1:
The dynamic self-adjustment capability of the tapered locking pin prevents it from getting stuck in the first place. By allowing angular adjustment during insertion, the mechanism avoids the sticking condition entirely, ensuring that unlocking remains simple and quick without requiring complex disassembly procedures.
4Stability of the object's composition
If the locking pin is designed with tight fit to prevent radial movement, then the locking stability is improved, but manufacturing errors cause the locking pin to bear additional radial load damaging main bearings
Solution Approach 1:
The tapered geometry changes the load distribution parameters, allowing the locking pin to accommodate radial misalignment through angular adjustment rather than bearing radial loads. This transforms the force transmission mode from direct radial loading to axial loading along the taper, protecting the main bearings from additional radial stresses.
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 solution ensures successful rotor locking without deformation or sticking, reduces maintenance costs, and extends the service life of main bearings by allowing for accurate alignment and secure locking without additional radial constraints.
Implementation Method 1
the brake 11 starts to brake by clamping the edge of the rotor connecting disc 1 tightly, to stop the rotation of the rotor connecting disc 1 by friction generated between the brake 11 and the rotor connecting disc 1
Implementation Method 2
hydraulic oil flows into a front cavity of the locking pin 5 and then pushes the locking pin 5 into the locking hole 401 under the action of the hydraulic press
Data Source
AI summary
An impeller locking device for a wind generator is provided. The impeller locking device includes a locking hole formed on an impeller connecting disc, and a locking pin configured to fit into the locking hole. The locking pin is connected with a base of the wind generator; and when the locking pin is locked in the locking hole, a radial clearance is provided between the locking pin and the locking hole. When the axes of the locking pins and the locking holes are deviated radially, the locking pins can also be inserted into the locking holes, so that radial constraints of the locking pins and the locking holes are eliminated. A wind generator adopting the impeller locking device is further provided.