Rotary Piston Pump Driver for Solid Capture
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Solution Overview
Problem
Rotary lobe pumps experience wear and efficiency issues when pumping liquids with solids due to solids becoming wedged between the piston tip and housing wall, leading to decreased tightness and increased backflow, requiring frequent maintenance.
Innovation Solution
Incorporating a driver made of wear-resistant material, such as hardened steel, into the recesses of the rotary piston to capture and compress solid bodies, effectively sealing the gap between the piston and housing wall, reducing wear and maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the gap between piston tip and housing wall is made small to ensure reliable delivery function, then pumping efficiency is improved, but wear and damage to surfaces increases due to solids becoming wedged between them
Solution Approach 1:
The patent introduces a driver as an intermediary element placed within the recess of the rotary piston. This driver captures solid particles and prevents them from becoming wedged between the piston tip and housing wall, thereby protecting the surfaces while maintaining the small gap necessary for pumping efficiency
Solution Approach 2:
The patent converts the harmful effect of solid particles into a beneficial function by using them to fill and seal the gap between the piston and housing wall. The solids are captured in the recess and compressed to form a sealing effect, reducing backflow while protecting surfaces from wear
2Reliability
If recesses are provided on the rotary piston to reduce wear by forcing solids into them, then surface durability is improved, but the available volume for fluid transport decreases
Solution Approach 1:
The patent applies local quality by providing recesses only in specific locations on the rotary piston where solids are most likely to cause wear, rather than reducing the overall piston volume. The recesses are strategically positioned to capture solids without significantly impacting fluid transport capacity
Solution Approach 2:
The driver is nested within the recess of the rotary piston, allowing the recess to serve dual purposes: maintaining structural integrity and capturing solids. The driver fits into the recess space, maximizing the use of available volume for both wear protection and fluid transport
3Reliability
If a driver is inserted into the recess to capture solids, then wear resistance is improved, but rotational resistance increases due to compressed solid material
Solution Approach 1:
The patent changes the physical state of solid particles from loose to compressed by using the driver to compact them within the recess. This compression increases wear resistance by creating a more stable sealing material, while the driver geometry is optimized to minimize the volume of compressed material and thus reduce rotational resistance
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 driver enhances wear resistance and reduces backflow by capturing and compressing solids, increasing the rotational resistance and extending the pump's service life while minimizing maintenance efforts.
Implementation Method 1
the driver makes a positive contribution to capturing larger quantities of solid bodies and directing them into the recess. In this case, the solid bodies are in any case partially pressed into the recess by advancing solid bodies.
Data Source
Figure 1
Figure 2~4
Figure 3b
AI summary
The invention relates to a rotary piston pump (10) for conveying fluids, in particular liquids laden with solid matter, having a housing (45) and having at least one pair of intermeshing rotary pistons (1) arranged within the housing (45), wherein a rotary piston (1) has in each case at least one recess (13, 43) formed on the circumferential surface (5) thereof and/or at least one recess (41) formed on an end surface (7, 9). The invention relates in particular to a rotary piston pump in which at least one driver (15, 17, 39, 51) is arranged in the at least one recess (13, 41, 43) and is designed for collecting solid matter. The invention also relates to a rotary piston for a rotary piston pump (10) for conveying fluids, in particular liquids laden with solid matter, having at least one recess (13, 43) formed on the circumferential surface (5) thereof and/or at least one recess (41) formed on an end surface (7, 9).