Pump and dishwasher comprising the same
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Solution Overview
Problem
Conventional dishwashers face issues with heater overheating and reduced heat exchange efficiency due to foreign matter adherence and corrosion, and the performance of pumps deteriorates when steam is discharged through the same flow path used for washing water.
Innovation Solution
A dishwasher design incorporating a pump with a heater that generates steam, featuring a selector valve to prevent washing water discharge and ensure steam is released, optimizing the steam discharge path to maintain pump performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the heater is installed inside the sump to heat washing water, then hot water can be generated, but the heater is exposed to washing water causing overheating, foreign matter adherence, and corrosion
Solution Approach 1:
The heater is extracted from the sump environment and relocated to the pump housing, where it heats washing water through the pump body wall without direct contact with washing water, eliminating exposure to foreign matters and corrosion while maintaining heating capability
Solution Approach 2:
The pump body wall acts as an intermediary medium, allowing thermal energy transfer from the heater to the washing water without direct contact between the heater and washing water, thus preventing foreign matter adherence and corrosion
2Temperature
If the heater is installed in the pump to heat washing water, then hot water and steam can be generated, but washing water flows out through the steam discharge path causing pump performance deterioration
Solution Approach 1:
The discharge system is segmented into separate paths: a washing water discharge path through the pump outlet and a steam discharge path through a dedicated steam discharge hole in the pump housing, preventing mixing of washing water and steam flows
Solution Approach 2:
The steam discharge function is extracted from the main pump outlet path and created as a separate discharge path through the pump housing, allowing independent control of steam and washing water discharge to maintain pump performance
3Use of energy by moving object
If the heater contacts washing water for heat exchange, then heating efficiency is improved, but foreign matter adheres to the heater surface and corrosion occurs
Solution Approach 1:
The pump body wall serves as a thermal intermediary, conducting heat from the heater to the washing water without requiring direct contact between the heater and washing water, maintaining heat exchange efficiency while preventing corrosion and foreign matter adherence
Solution Approach 2:
The thin pump body wall acts as a thermal film that efficiently transfers heat from the heater to the washing water while providing a protective barrier that prevents direct contact between the heater and washing water, eliminating corrosion and foreign matter accumulation
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 effectively generates steam without compromising pump performance, ensuring efficient steam discharge and preventing washing water from interfering with steam flow, thus maintaining the dishwasher's operational efficiency.
Implementation Method 1
a heater which is coupled to the housing and heats the washing water in the housing to generate steam
Implementation Method 2
an impeller which is disposed in the housing and discharges the washing water flowed into the washing water inlet pipe into the washing water outlet pipe
Data Source
AI summary
The present disclosure relates to a pump for transmitting washing water and generating steam and a dishwasher including the pump. The pump includes a housing; a washing water inlet pipe coupled to the housing to receive washing water; a washing water outlet pipe coupled to the housing to discharge the washing water; an impeller disposed in the housing to discharge the washing water from the washing water inlet pipe to the washing water outlet pipe; a heater coupled to the housing to heat the washing water in the housing and generate steam; a steam discharge pipe to discharge the steam generated by the heater; and a selector valve coupled to the steam discharge pipe to block the discharge of the washing water and allow the steam to be discharged, thereby preventing the discharge of washing water through the steam discharge pipe.