Pump and dishwasher comprising the same
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Solution Overview
Problem
Conventional dishwashers face issues with heat exchange efficiency and heater durability due to foreign matter adherence and corrosion, and the introduction of air or washing water during steam discharge lowers the pressure of washing water spraying.
Innovation Solution
A pump design with a heater integrated into the lower portion, where steam is generated and discharged through a pipe opposite to the washing water outflow, minimizing water leakage and optimizing steam discharge direction to prevent air introduction and maintain efficient water spraying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the heater is exposed to the inside of the sump to contact the washing water for heating, then heat exchange efficiency is improved, but foreign matter adheres to the heater surface causing durability deterioration and reduced heat exchange efficiency
Solution Approach 1:
The heater is extracted from the sump interior and relocated to the pump housing, where it contacts washing water only in the controlled pump chamber environment. This separates the heater from the sump's foreign matter while maintaining its heating function through controlled water contact in the pump system.
Solution Approach 2:
The pump housing serves as an intermediary chamber between the sump and the heater. The heater is positioned in this intermediate space where it can receive washing water from the sump through the pump system while being protected from direct exposure to foreign matter in the sump.
2Temperature
If steam is discharged through a flow path that also discharges washing water, then steam generation is achieved, but air is introduced or washing water is discharged through the steam flow path lowering spray pressure
Solution Approach 1:
The pump housing is segmented into distinct functional zones: a steam discharge flow path and a washing water discharge flow path. The partition wall divides the interior space so that steam generated by the heater exits through one path while washing water is discharged through another, preventing mixing and maintaining separate flow dynamics for each function.
Solution Approach 2:
Different regions of the pump housing are assigned different functional qualities: the steam discharge path is optimized for vapor flow with appropriate positioning and cross-sectional area, while the washing water path is optimized for liquid flow and pressure maintenance. This local functional differentiation ensures each fluid type exits through the most suitable path.
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 efficient steam generation and discharge without compromising washing water pressure, enhancing heat exchange efficiency and extending heater durability while preventing air introduction into the pump.
Implementation Method 1
a heater which is coupled to a lower side of the housing and generates steam by heating the washing water in the housing
Implementation Method 2
an impeller which is disposed inside the housing and flows washing water
Data Source
Figure 1
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AI summary
The present invention relates to a pump (150) which sends washing water and generates steam in order to wash the dishes or the cooking utensils, and a dishwasher (1) including the same. The pump (150) according to an embodiment of the present invention includes a housing (152); an impeller (155) which is disposed inside the housing (152) and flows washing water; and a heater (151) which is coupled to a lower side of the housing and generates steam by heating the washing water in the housing, wherein the housing (152) includes: a pump lower portion (1521) through which the washing water is introduced by rotation of the impeller (155); and a pump upper portion (1522) through which the washing water flows out by rotation of the impeller (155) and the steam generated by the heater (151) flows out, thereby generating steam.