Rotor Pump Vane Segmentation for Wear-Resistant Tip Replacement
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Solution Overview
Problem
Existing rotor pumps face high repair costs due to wear on the inner peripheral surface of the pump casing, and lack of secure attachment for vane tips leads to unnecessary complete pump replacement.
Innovation Solution
A rotor pump design featuring a lightweight plastic vane body and thermoplastic tips with a tongue-and-groove connection, allowing for easy replacement and secure attachment without adhesives, reducing wear and enabling cost-effective maintenance by replacing only worn tips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If hard material inserts are used for vane tips, then wear resistance is improved, but the inner peripheral surface of the pump casing still wears and requires expensive replacement
Solution Approach 1:
The vane is divided into two separable parts: a base body made of lightweight plastic and replaceable tips made of hard wear-resistant material. This segmentation allows the tips to be replaced independently when worn, without replacing the entire vane or pump casing, thus reducing repair costs while maintaining wear resistance.
Solution Approach 2:
The vane combines two different materials with complementary properties: lightweight plastic for the base body (providing low inertia and ease of movement) and hard wear-resistant material for the tips (providing abrasion resistance). This composite structure optimizes both performance characteristics without the drawbacks of using single materials throughout.
2Strength
If vane tips are made of hard material, then wear resistance is improved, but the entire pump must be replaced instead of just the worn parts
Solution Approach 1:
The vane structure is segmented into a reusable base body and replaceable tips. The tips are designed as separate components that can be independently removed and replaced, eliminating the need to replace the entire pump assembly when wear occurs. This reduces device complexity in terms of maintenance scope.
Solution Approach 2:
The design allows the base body to be recovered and reused while only the worn tips are discarded and replaced. This selective replacement strategy reduces waste and minimizes the scope of parts that need to be replaced, addressing the issue of unnecessary complete pump replacement.
3Stability of the object's composition
If vane body and vane tip are permanently connected, then structural integrity is improved, but the connection may fail due to inadequate material bonding
Solution Approach 1:
Rather than attempting to permanently bond dissimilar materials, the design segments the vane into a base body and tips that are mechanically retained through a tongue-and-groove interface. This approach acknowledges the limitations of bonding dissimilar materials and uses mechanical interlocking instead, improving connection reliability.
Solution Approach 2:
The tongue-and-groove connection with retaining features creates a self-retaining structure that maintains structural integrity through its own geometry rather than relying on external adhesives or complex bonding processes. The design is self-sufficient in maintaining the connection between base body and tips.
4Strength
If heavy material like aluminum is used for the vane, then strength is improved, but mass inertia increases and wear increases
Solution Approach 1:
The vane uses a composite construction combining lightweight plastic for the base body with hard material inserts for the tips. This provides the necessary strength at the contact points while keeping the overall mass low, reducing inertia and wear compared to using solid aluminum or other heavy materials throughout.
Solution Approach 2:
The hard wear-resistant material is applied locally only where needed (at the tips that contact the pump casing) rather than throughout the entire vane structure. The base body remains lightweight plastic, optimizing the distribution of material properties to achieve strength where required while minimizing overall weight.
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 design reduces wear, minimizes the need for complete pump replacement, and ensures secure, cost-effective repairs by allowing quick and inexpensive replacement of vane tips, while maintaining the integrity of the pump housing.
Implementation Method 1
The form fit has the significant advantage that no additional aids, such as adhesive or the like, are required to attach the wing tip to the wing body.
Implementation Method 2
the wing itself has a very low mass inertia and therefore lower forces act on the wing tips. The blade can therefore move back and forth more easily in the rotor and wear is reduced.
Data Source
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AI summary
The invention relates to a rotor pump comprising a pump housing and a rotor which is rotatably mounted therein. A vane is displaceably mounted in the rotor with the base body thereof, lies on an inner peripheral surface with the tips thereof, and defines an inlet chamber and a pressure chamber. The vane has a constant length, the vane base body consists of a plastic material, and the vane tips provided on the free ends thereof facing the inner peripheral surface consist of a thermoplastic material. The vane base body and the vane tips are fixed to each other in a detachable and form-fitting manner following the production thereof.