Dishwasher Sump Microfilter Layout for Low-Flow Water Filtration
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Solution Overview
Problem
Existing dishwashing machines with filtration devices suffer from inadequate microfiltration, especially during reduced water flow rates, as most water passes through coarse screens without reaching the finer microfiltration levels, leading to insufficient or non-existent microfiltration of dishwashing water.
Innovation Solution
A dishwashing machine design featuring a sump with a filtration device comprising a waste trap, intermediate filter, and microfilter, where the inlet for the water circulation device is centrally located within the microfilter, and the drain device inlet is on the periphery, ensuring that dishwashing water preferentially passes through the microfilter for effective microfiltration regardless of flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a fine funnel-shaped screen with a large opening angle is used for water circulation, then water flow is improved, but microfiltration efficiency deteriorates because most water passes through without reaching the very fine sieve
Solution Approach 1:
The patent implements a nested filtration structure where the fine sieve is positioned inside the funnel-shaped screen, and the very fine sieve is positioned inside the fine sieve. This nested arrangement allows water to pass through progressively finer filtration levels, ensuring that even during high flow rates, water is effectively microfiltered. The suction inlet is positioned to draw water from within this nested structure, guaranteeing microfiltered water is recirculated.
Solution Approach 2:
The patent adds a vertical dimension to the filtration system by stacking multiple filtration levels (funnel-shaped screen, fine sieve, very fine sieve) one above the other. This vertical arrangement allows water to traverse through multiple filtration stages sequentially, transforming a single-plane filtration approach into a multi-layered vertical filtration system that maintains both flow rate and microfiltration efficiency.
2Productivity
If a fine funnel-shaped screen with a large opening angle is used, then water circulation is enhanced, but microfiltration becomes insufficient or non-existent during reduced water flow rates
Solution Approach 1:
The nested arrangement of filtration screens ensures that regardless of water flow rate, water must pass through all three levels (funnel-shaped screen, fine sieve, very fine sieve) before being recirculated. The suction inlet positioned within this nested structure guarantees that even during low flow rates, the water drawn for recirculation has undergone complete microfiltration through all stages.
Solution Approach 2:
The filtration system performs preliminary action by pre-filtering water through multiple stages before it reaches the suction inlet for recirculation. This preliminary microfiltration ensures that water is cleaned of microimpurities before being pumped back onto the dishes, maintaining consistent microfiltration quality regardless of subsequent flow rate variations during different washing phases.
3Ease of manufacture
If the suction inlet for water circulation is located outside the sieve device, then ease of manufacture is improved, but microfiltration of recirculated water deteriorates
Solution Approach 1:
The suction inlet for water circulation is positioned inside the nested sieve structure, specifically within the very fine sieve. This positioning ensures that water drawn for recirculation has already passed through all filtration levels, guaranteeing microfiltration quality. The nested design maintains ease of manufacture by using a modular structure where the suction inlet is integrated into the existing sieve assembly rather than requiring separate external components.
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 configuration guarantees that a significant portion of dishwashing water passes through the microfilter, improving microfiltration efficiency even during low flow rates, such as during hot rinsing steps, thereby ensuring cleaner water is recycled and preventing microimpurities from being redeposited.
Implementation Method 1
a device for filtering water for cleaning the dishes, said washing tank comprising a bottom wall, side walls, an upper wall and a bottom wall
Implementation Method 2
said filtration device comprising a waste trap, an intermediate filter and a micro filter
Data Source
Figure 1~2
AI summary
The dishwasher has a washing tank (1) including lateral walls, a bottom wall, an upper wall and a lower wall (3) that is provided with a sump (4). A cylindrical cleaning water filtering device (5) is partially housed inside the sump. The sump has an inlet opening (6) that is opened towards a water circulation device and arranged in a central part of a microfilter (10) of the filtering device. The sump has another inlet opening (7) that is opened towards a draining device and arranged at an exterior of the microfilter.