Pump Heated Fluid Thermal Expansion Match
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Solution Overview
Problem
Pumps used to deliver heated fluids face issues with thermal expansion, where the plastic-made impeller and metal-made impeller cavity walls experience different thermal expansion coefficients, leading to blockages or excessive wear due to the compression of the gap between the impeller and the cavity wall.
Innovation Solution
The pump design includes an impeller and a second housing made of materials with the same or similar thermal expansion coefficients, ensuring that the size changes of these components after thermal expansion are close, thereby reducing the risk of blockages or excessive friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the impeller cavity is made as small as possible to improve pumping efficiency, then the gap between the impeller and the cavity wall is reduced, but the risk of blockage and excessive wear increases when handling heated fluids
Solution Approach 1:
The patent changes the material parameter (thermal expansion coefficient) of the impeller cavity wall to match that of the impeller. By using a plastic material for the second housing that has a thermal expansion coefficient similar to the impeller material, the gap between the impeller and cavity wall remains stable during thermal expansion, preventing blockage and excessive wear while maintaining the small cavity design for high pumping efficiency.
2Ease of manufacture
If the impeller is made of plastic to reduce weight and cost, then manufacturing ease is improved, but thermal expansion differences with metal cavity walls cause blocking and wear issues
Solution Approach 1:
The patent applies homogeneity by making both the impeller and the second housing (impeller cavity wall) from plastic materials with matching thermal expansion coefficients. This homogeneous material selection ensures that both components expand uniformly when exposed to heat, maintaining the designed gap dimensions and preventing blocking and excessive wear, while preserving the manufacturing advantages of plastic materials.
3Strength
If the second housing is made of metal to provide high strength, then structural strength is improved, but thermal expansion differences with the plastic impeller cause gap compression and blocking
Solution Approach 1:
The patent changes the material parameter (thermal expansion coefficient) of the second housing from metal to plastic, matching that of the impeller. This parameter change prioritizes thermal expansion compatibility over maximum structural strength, as the plastic material still provides sufficient strength for the application while ensuring that the housing and impeller expand uniformly, maintaining stable gaps and preventing blocking during heated fluid operation.
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 effectively reduces the risk of blockages and excessive friction, ensuring stable operation of the pump even when handling heated fluids at high temperatures, by maintaining consistent gaps between the impeller and the impeller cavity walls.
Implementation Method 1
the second housing and the impeller are respectively made of materials having same or similar thermal expansion coefficients
Data Source
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AI summary
The invention discloses a pump capable of delivering a heated liquid. The pump includes a driving portion, an impeller portion, and a cover portion that are sequentially connected. A fluid inlet and a fluid outlet are provided on the cover portion, the driving portion includes a first housing, the impeller portion includes an impeller and a second housing, the first housing, the second housing, and the cover portion are sequentially fixedly connected to define an impeller cavity for mounting the impeller, and the second housing and the impeller are respectively made of materials having same or similar thermal expansion coefficients. Therefore, size changes of the second housing and the impeller after thermal expansion are close, so that a risk of blocking or excessive friction is reduced.