Non-clogging Pump Impeller Guide Surfaces for Foreign Matter Passage
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Solution Overview
Problem
The existing non-clogging pumps face issues with poor passage performance of foreign matter due to the flow straightener being positioned immediately below the impeller, leading to entanglement and complex device configurations.
Innovation Solution
A non-clogging pump design that includes an impeller with vane portions and a main plate protrusion, along with a suction port protrusion on the pump casing, which guides foreign matter to the outer periphery of the impeller without a dedicated flow straightener, improving passage performance and reducing device complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flow straightener is disposed immediately below the impeller to guide foreign matter, then the passage performance of foreign matter is improved, but the foreign matter is caught between the flow straightener and the impeller
Solution Approach 1:
Instead of adding a flow straightener below the impeller to guide foreign matter (conventional approach), the invention inverts the approach by designing the impeller itself with guide surfaces that direct foreign matter toward the outer periphery, eliminating the need for additional components and avoiding entanglement issues
2Reliability
If a flow straightener is provided as a dedicated configuration to pass foreign matter, then the passage performance is improved, but the device configuration becomes complicated
Solution Approach 1:
The invention merges the foreign matter guidance function with the impeller structure itself by providing guide surfaces on the impeller's main plate and vanes, combining multiple functions into a single component and eliminating the need for separate flow straightener devices
Solution Approach 2:
The impeller is designed to serve multiple functions: it not only imparts kinetic energy to the fluid but also guides foreign matter through its guide surfaces, making the impeller a multi-functional component that reduces overall device complexity
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 design enhances the passage performance of foreign matter by guiding it around the impeller, reducing entanglement, and simplifying the device configuration, while also reducing vibration and maintaining pump efficiency.
Implementation Method 1
a second end face that is an end face in the counter-inflow direction, which is connected to the first end face from the inner periphery side in the radial direction of the first end face and located on the inner periphery side in the radial direction, and is inclined with respect to the first end face so as to be located on a counter-inflow direction side toward the inner periphery side in the radial direction
Implementation Method 2
the inner periphery-side end portion of the suction port protrusion portion is disposed close to a side surface of the main plate protrusion portion when viewed from the axial direction of the rotating shaft
Data Source
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AI summary
A non-clogging pump includes a pump casing and an impeller that includes a main plate portion and a vane portion, in which the main plate portion includes a main plate protrusion portion that protrudes in a counter-inflow direction, the vane portion includes a first end face and a second end face and is connected to the main plate protrusion portion at an inner periphery-side end portion, and an inner peripheral wall that forms the suction port of the pump casing includes a suction port protrusion portion that is provided at a portion in a rotation direction of the rotating shaft, is disposed along the second end face with a gap from the second end face, and protrudes toward a center side of the suction port.