Grinder Pump Baffle and Cutter Mechanism
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Solution Overview
Problem
Existing waste pumping systems face inefficiencies in evacuating waste from toilets, particularly due to inadequate design features that hinder the flow of materials towards the pump, leading to incomplete evacuation and potential clogging, and lack effective mechanisms for sensing fluid levels and activating the pump accurately.
Innovation Solution
The waste pumping system incorporates a baffle system with multiple baffle portions to direct and shield the pump and sensing system, creating a fill differential that ensures efficient flow towards the pump, along with a sensing system that activates the pump based on fluid levels, and a cutter plate and blade mechanism to grind solids, allowing for efficient evacuation and reduced motor torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a baffle system is added to direct waste flow towards the pump, then evacuation efficiency is improved, but device complexity increases
Solution Approach 1:
The tank is divided into a first area and a second area by a baffle system, with the first area designated for waste collection and the second area for pump operation. This segmentation directs waste flow efficiently toward the pump while isolating the pump from direct waste contact, improving evacuation efficiency without requiring complex mechanical components.
Solution Approach 2:
The baffle system acts as an intermediary structure that guides waste flow from the collection area to the pump area. The baffle portions create a controlled flow path that ensures waste is directed toward the pump inlet, improving evacuation efficiency while maintaining a relatively simple device structure.
2Reliability
If a sensing system is added to accurately detect fluid levels and activate the pump, then evacuation completeness is improved, but device complexity increases
Solution Approach 1:
The sensing system is positioned within the first area to autonomously detect waste accumulation levels and automatically activate the pump when the waste reaches a predetermined level. This self-service mechanism ensures complete evacuation without requiring manual intervention or complex control systems.
Solution Approach 2:
The sensing system provides feedback on the waste level in the first area, triggering pump activation when the waste reaches a critical level. This feedback mechanism ensures reliable and complete evacuation by continuously monitoring waste accumulation and responding appropriately, while maintaining simple system architecture.
3Reliability
If a cutter blade mechanism is added to grind solids, then clogging risk is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The cutter blade is designed to rotate dynamically within the pump assembly, engaging with solids in the waste stream to grind them into smaller particles. This dynamic cutting action effectively reduces clogging risk by breaking up solid materials, while the simple rotational mechanism maintains ease of manufacture and assembly.
Solution Approach 2:
The cutter blade is constructed from materials that combine cutting effectiveness with resistance to corrosion and wear from contact with waste materials. This composite material approach reduces clogging risk through effective solid grinding while maintaining manufacturing feasibility through the use of standard corrosion-resistant materials.
4Reliability
If the pump is shielded by baffles to protect from direct waste contact, then pump reliability is improved, but waste flow direction control becomes more complex
Solution Approach 1:
The pump assembly is separated from the waste collection area by baffle portions, creating distinct zones for waste collection and pump operation. This segmentation protects the pump from direct waste contact and potential damage, while the baffle design maintains simple flow direction control through natural gravity-driven waste movement toward the pump inlet.
Solution Approach 2:
The baffle system serves as an intermediary structure that protects the pump from direct waste contact while still allowing controlled waste flow toward the pump inlet. The baffles create a protective barrier that directs waste flow indirectly, improving pump reliability without requiring complex flow control mechanisms.
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 system ensures complete evacuation of waste, reduces the risk of clogging, and operates with a lower horsepower motor while maintaining cutting efficiency, effectively handling various sanitary sewage items.
Implementation Method 1
a cutter blade in direct contact with the cutter plate. The cutter blade is movable in relation to the cutter plate... the cutter blade and the cutter plate... increase the cutting ability of the cutter blade
Implementation Method 2
an impeller capable of pumping the liquid... out through a discharge pipe
Data Source
AI summary
A pump is provided including a cutter plate disposed at a pump inlet including a plurality of holes. Multiple embodiments provide that the pump includes a rotatable cutter blade disposed substantially adjacent to the cutter plate. Embodiments include those wherein the plurality of holes are angled in a direction of rotation of the cutter blade. In some embodiments, the cutter blade has at least one relief hole and at least one cutting edge. Additional embodiments include those wherein a ring extends outward from the pump inlet for channeling material toward the pump inlet in a substantially perpendicular approach with respect to the cutter plate.