Rotary Displacement Pump with Obtuse-Angled Stator for Solids Emulsions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rotary displacement pumps are not suitable for pumping solids emulsions and liquid explosives, as they lead to material buildup, increased friction, pressure, and heat, potentially causing pump failure or explosion, and existing pumps are large and complex, limiting their application.
Innovation Solution
A rotary displacement pump design featuring a rotor with a radially protruding web and a scraper with an engagement slot, combined with a stator and pump housing, which minimizes material buildup through an obtuse-angled transition and pressure relief features, allowing efficient and safe pumping of solids emulsions and liquid explosives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional rotary displacement pump is used to pump solids emulsions, then the pump can move the material, but material builds up and packs in certain regions increasing friction and pressure
Solution Approach 1:
The scraper is designed with variable thickness along its length, creating different local geometries that optimize material clearance at different positions. The engagement slot has varying width to prevent material packing in specific regions while maintaining effective scraping action throughout the pump chamber.
Solution Approach 2:
The scraper ends are rounded instead of sharp edges to prevent material buildup in corners and reduce stress concentration. The curved geometry helps material flow smoothly without getting trapped, reducing friction and preventing pressure buildup that could lead to pump failure.
2Productivity
If a conventional rotary displacement pump is used to pump liquid explosives, then the pump can transport the liquid, but temperature rises above critical points causing explosion risk
Solution Approach 1:
The scraper geometry is optimized with variable thickness to create efficient material displacement zones that reduce mechanical work and heat generation. The engagement slot design minimizes friction between the rotor web and scraper, reducing adiabatic heating of the liquid explosive during pumping.
Solution Approach 2:
Rounded scraper edges and smooth transitions in the pump chamber eliminate sharp corners where material could get trapped and subjected to repeated compression and shear, which generates heat. The curved geometry promotes laminar flow and reduces turbulent heating.
3Reliability
If bigger and more complex pumps are used to pump solids emulsions, then pumping reliability improves, but pump size and complexity increase limiting applications
Solution Approach 1:
The scraper combines multiple functions into a single component: material scraping, sealing between rotor and stator, pressure equalization, and prevention of material buildup. The engagement slot simultaneously guides the rotor web and controls material flow, eliminating the need for separate components.
Solution Approach 2:
The scraper design serves multiple purposes: it scrapes material from the rotor, seals the pump chamber, prevents material packing, and maintains pressure balance. This multi-functional approach achieves reliable pumping of solids emulsions with a simple, compact design suitable for various applications.
Data Source
AI summary
A rotary displacement pump of an undulatory disk type; with a pump housing (24) comprising a front end plate (56) and a rear end plate, the pump housing enclosing a stator (40, 48), a rotor (42), a scraper (44) and a scraper guide (46), a shaft (8) extending through at least the rear end plate; the stator including a generally semi-circular arc-formed first stator member (40) and a generally semi-circular arc-formed second stator member (48), the stator, the pump housing and the scraper together with the scraper guide defining an inlet and outlet chamber, wherein at least part of the end faces of the first and second stator members being situated in the outlet chamber are oblique so as to provide an obtuse-angled transition to the inner faces of the front end plate and the rear end plate.