Dishwasher Sump Filter Structure for Stick Debris Blockage Prevention
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Solution Overview
Problem
Conventional dishwashers face issues with filtering stick-shaped foreign substances, which can block drainage paths and damage internal components, and lack an auxiliary handle for easy filter device detachment.
Innovation Solution
A dishwasher with a filter device featuring a dual-body structure including a first body with larger holes and a second body with smaller holes, along with ribs and a mesh member, designed to efficiently filter various-sized foreign substances and prevent blockages, and a handle for smooth detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional filter device with stacked first and second filters is used, then foreign substances can be filtered, but stick-shaped foreign substances can pass through and block the drainage path
Solution Approach 1:
The filter device is divided into three functional segments: the first filter for large foreign substances, the second filter for smaller particles, and the foreign substance plate with through-holes specifically for intercepting stick-shaped objects. This segmentation allows each component to target specific types of foreign substances, preventing stick-shaped objects from reaching the drainage path while maintaining effective filtration of other debris.
Solution Approach 2:
The foreign substance plate acts as an intermediary component between the second filter and the drainage path. It provides an additional filtering layer with through-holes that specifically catch stick-shaped foreign substances that passed through both filters, serving as a mediator to prevent these objects from blocking the drainage path while allowing wash water to pass through.
2Ease of operation
If the filter device is detachably installed in the sump cover, then maintenance is easier, but the foreign-substance plate is detached together and caught in the injection arm
Solution Approach 1:
The foreign substance plate is extracted from the sump cover and integrated into the filter device assembly. This allows the plate to be removed together with the filter device by the user without requiring separate detachment of the sump cover, eliminating the problem of the plate being left behind and caught in the injection arm while maintaining easy maintenance access.
Solution Approach 2:
The foreign substance plate is merged with the filter device structure, forming an integrated assembly where the plate, first filter, and second filter work together as a single removable unit. This combination ensures that when users detach the filter device for maintenance, the foreign substance plate is automatically removed as well, preventing it from being left in the sump cover and caught in the injection arm.
3Reliability
If stick-shaped foreign substances pass through the filter device, then filtration is incomplete, but they can damage the sump, pump or internal walls
Solution Approach 1:
The foreign substance plate introduces a localized filtering mechanism with specifically sized through-holes positioned to intercept stick-shaped foreign substances. This local quality enhancement at the critical point where stick-shaped objects might pass through prevents incomplete filtration and protects components from damage caused by these specific types of debris.
Solution Approach 2:
The foreign substance plate performs preliminary interception of stick-shaped foreign substances before they can reach and damage the sump, pump, or internal walls. By capturing these objects early in the filtration process, the system prevents potential damage to critical components while ensuring complete filtration of all foreign substances.
Data Source
AI summary
Disclosed is a dishwasher comprising a tub defining a washing space, a sump provided to collect the wash water injected into the tub, a supply pump provided to supply the wash water stored in the sump to the tub, a filter provided in the sump and comprising a first body having a plurality of first holes formed along a lateral circumferential surface; and a second body arranged in a radially inner side of the first body and having a plurality of second holes formed along a lateral circumferential surface, wherein the second body comprises an external wall portion in which the second holes are formed and an internal wall portion positioned in a radially inner side of the external wall and vertically extended.