Motor Pump Unit Inclined Outer Wall Float Handling
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Solution Overview
Problem
Existing motor-pump units for pumping black water or sewage struggle to maintain suction symmetry and low suction levels without complex and costly arrangements, especially when dealing with floating materials, requiring tilting which complicates manufacturing and mounting.
Innovation Solution
The motor-pump unit design features a second part of the outer wall with a higher lower edge than the inner wall, allowing for suction of floating particles without tilting, and an inclined second part to enhance speed gradient for better float entrainment, facilitating the elimination of floating particles without the need for a footing or parallel supply zone walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pump unit is tilted to facilitate pumping of floating materials, then the pumping of floats is improved, but the manufacturing complexity and cost increase due to heavier and more difficult-to-manufacture seat legs with inclined adaptation claws
Solution Approach 1:
The outer wall is divided into two parts: a first part with a lower free bottom edge and a second part with a higher free bottom edge. This segmentation allows the pump to handle floating materials effectively without requiring tilted seat legs, as the geometric configuration itself creates the necessary flow patterns for float entrainment.
Solution Approach 2:
Instead of tilting the entire pump unit to pump floats, the invention inverts the approach by keeping the pump vertical and using a specific geometric configuration of the suction inlet and supply zone to achieve float pumping. The second part of the outer wall is positioned higher, creating a flow pattern that naturally entrains floats without inclination.
2Productivity
If the pump unit is tilted to pump floating materials, then float pumping is improved, but the suction symmetry is lost and suction level in the sump increases
Solution Approach 1:
The outer wall is segmented into two distinct parts with different vertical positions. The first part maintains the traditional lower position for general liquid suction, while the second part is positioned higher to specifically address float pumping. This segmentation preserves overall suction symmetry while adding specialized functionality.
Solution Approach 2:
The second part of the outer wall is designed with specific local qualities: it has a higher free bottom edge, creates a supply zone with specific geometric characteristics, and generates a flow pattern that is locally optimized for float entrainment. This local quality enhancement does not compromise the overall suction symmetry.
3Reliability
If a vortex prevention device is added to the sump, then vortex prevention is improved, but the device complexity and cost increase
Solution Approach 1:
The invention merges the vortex prevention function with the existing suction inlet and supply zone geometry. By configuring the second part of the outer wall and the supply zone in a specific way, the system simultaneously achieves float pumping and vortex prevention without adding separate devices. The flow patterns generated by the geometric configuration inherently prevent vortices.
4Productivity
If the lower edge of the second part of the outer wall is at a higher level than the inner wall, then float pumping is improved without tilting, but the manufacturing precision requirements increase
Solution Approach 1:
The invention changes the geometric parameters of the suction inlet and supply zone by positioning the second part of the outer wall higher than the inner wall. This parameter change creates the necessary flow patterns for float pumping. The specific vertical offset and angular positioning (30° to 60°) are optimized to balance manufacturing feasibility with effective float entrainment.
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 maintains suction symmetry and low suction levels while preventing air trapping and easy repriming, allowing efficient pumping of floats and liquids, even when mounted on a tripod, without the need for tilting or complex arrangements.
Implementation Method 1
an impeller 3 below the motor 2. The impeller 3 is set in rotation by the motor 2
Implementation Method 2
a suction inlet 1, 7, 10 which is delimited by the inner wall 7 and the outer wall 6
Data Source
AI summary
In this motor pump unit, a part (15) of the supply area (10) is inclined relative to the axis (1) of the unit, which makes it easier to pump floating materials.