Dishwasher Pump Heater Cover for Even Water Heating
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Solution Overview
Problem
Conventional dishwashers face issues with uneven heating of washing water due to foreign matter sticking to the heater surface, leading to reduced heat exchange efficiency and potential overheating, as the heater is directly exposed to water and prone to corrosion.
Innovation Solution
A pump design featuring a heater plate that heats a heater cover indirectly, preventing direct contact between the heater and the cover, and using a heater shield to distribute heat evenly, ensuring the washing water is not concentrated on any specific area, thus preventing lime or foreign matter from sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the heater is directly exposed to washing water to heat it, then heating efficiency is improved, but the heater surface accumulates foreign matter and lime leading to reduced heat exchange efficiency and corrosion
Solution Approach 1:
The patent introduces a heater cover as an intermediary component between the heater and washing water. The heater cover receives heat from the heater through thermal conduction and transfers it to the washing water, preventing direct contact between the heater and water. This resolves the contradiction by maintaining heating efficiency while preventing foreign matter accumulation and corrosion on the heater surface.
2Loss of energy
If the heater is directly exposed to washing water, then heat exchange efficiency is improved, but foreign matter adheres to the heater surface decreasing efficiency
Solution Approach 1:
The heater cover serves as a mediator that prevents foreign matter and lime from adhering to the heater surface. By positioning the heater cover between the heater and washing water, the system maintains effective heat transfer while the cover surface (rather than heater surface) is exposed to water, preventing contaminant accumulation that would reduce heat exchange efficiency.
3Temperature
If the heater intensively heats a specific part of the bottom surface, then heating occurs, but lime and foreign matter stick and pile on that specific part
Solution Approach 1:
The heater cover distributes heat from the heater uniformly across its surface area rather than allowing intensive heating at a single point. The cover's larger surface area and thermal conduction properties create a more uniform temperature distribution, preventing localized overheating that would cause lime and foreign matter to stick and pile up in specific areas.
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 solution ensures even heating of washing water, prevents foreign matter from sticking to the heater cover, and allows for firm coupling of the heater, cover, and plate, maintaining a low temperature in areas not in direct contact with the heater, thus enhancing durability and efficiency.
Implementation Method 1
a heater plate joined to a lower side of the heater cover; and wherein a heater is joined to a lower side of the heater plate to heat the heater plate, wherein the heater plate heated by the heater is configured to heat the heater cover
Data Source
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AI summary
The present invention relates to a pump (8) and a dishwasher 1 including the same. The pump (8) of the present invention includes a housing (82) having a cylindrical shape to contain water; an rotatable impeller (85) to discharge the water in the housing (82) to an external; a heater cover (81) to form a bottom surface of the housing (82); a heater plate (88) joined to a lower side of the heater cover (81); and a heater (83) joined to a lower side of the heater plate (88) to heat the heater plate (88). The heater (83) is not in directly contact with the heater cover (819.