Wind Turbine Rotor Blade Tip Adhesive Connection
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Solution Overview
Problem
Existing rotor blade tip designs are heavy, expensive, and prone to damage during installation and maintenance, with existing connection methods creating defects that can lead to moisture penetration and structural damage.
Innovation Solution
A rotor blade tip made of the same material as the main blade, connected via an adhesive method using a fixing means actuated through a small opening in the blade tip's surface, avoiding the need for surface penetration and allowing for easy replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rotor blade tip is made of aluminum, then it provides good structural properties, but it becomes heavy and expensive to manufacture
Solution Approach 1:
The patent applies composite materials by combining fiberglass (lightweight) for the main blade structure with aluminum (strong) only for the tip section that requires electrical conductivity and lightning strike resistance. This composite approach optimizes both weight and strength properties.
Solution Approach 2:
The invention applies local quality by using aluminum material specifically at the blade tip where electrical conductivity is needed for lightning protection, while the rest of the blade uses lighter fiberglass material. This localized material selection resolves the contradiction between overall weight reduction and localized strength/conductivity requirements.
2Reliability
If a screw connection is used to attach the blade tip, then it provides secure fixing, but it creates defects on the rotor blade surface that allow moisture penetration
Solution Approach 1:
The patent extracts the harmful effect by removing the screw connection from the rotor blade surface entirely. Instead, the fixing elements are contained within the blade tip structure itself, which is then bonded to the blade. This eliminates the surface defects that would allow moisture penetration while maintaining secure fixing.
Solution Approach 2:
The invention introduces adhesive bonding as an intermediary method between the blade tip and rotor blade surface. This adhesive layer provides secure fixing without requiring surface-penetrating mechanical fasteners, thus preventing moisture penetration paths.
3Ease of manufacture
If the blade tip is made of the same material as the rotor blade, then it simplifies manufacturing, but it cannot provide adequate lightning strike protection
Solution Approach 1:
The patent uses composite materials with aluminum specifically at the blade tip to provide electrical conductivity for lightning strike protection, while the rest of the blade uses fiberglass. This composite structure maintains manufacturing simplicity while adding the necessary lightning protection capability.
Solution Approach 2:
The invention applies local quality by using aluminum material specifically at the blade tip where electrical conductivity is needed for lightning protection, while the rest of the blade uses lighter fiberglass material. This localized material selection resolves the contradiction between overall weight reduction and localized strength/conductivity requirements.
4Ease of repair
If the blade tip is designed as a separate component, then it enables easy replacement after lightning strike, but it increases device complexity
Solution Approach 1:
The patent applies segmentation by designing the blade tip as a separate, replaceable component that can be easily detached and replaced after lightning strikes. This modular approach enables quick replacement while the connection mechanism itself remains relatively simple through adhesive bonding.
Solution Approach 2:
The invention replaces complex mechanical connection systems (such as multiple screws, bolts, or locking mechanisms) with a simpler adhesive bonding system. This substitution maintains the ease of replacement benefit while significantly reducing the complexity of the connection structure.
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 reduces production costs, minimizes damage during installation, and prevents moisture ingress, enabling a lightweight, cost-effective, and easily replaceable rotor blade tip with improved aerodynamics.
Implementation Method 1
The rotor blade tip can be connected to the rotor blade in a simple manner, for example, via an adhesive bond
Data Source
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AI summary
The invention relates to a rotor blade (30) of a wind turbine (100), comprising a main blade part and a blade tip (260), the blade tip (260) being detachably fastened to the main part by means of a connecting device (202). The connecting device (202) comprises a tip section (206) fastened to the blade tip (260) and a base section (204) for receiving the tip section (206), said base section being fastened to the main blade part. The tip section (206) comprises at least one securing means (242) for securing the tip section (206) to the base section (204), said securing means extending at least to the base section (204). The securing means (242) can be actuated through an opening (286) in the surface (282) of the blade tip (260) to secure the tip section.