Dishwasher Drain Pump Venting to Prevent Gas Bubble Noise
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Solution Overview
Problem
Existing water-bearing household appliances, such as dishwashers, face challenges in achieving high pumping capacity while maintaining low-noise operation, as part of the washing liquid is recirculated back into the pump well during drain operation, impairing the delivery capacity of the drain pump.
Innovation Solution
A venting operating mode is introduced where a gas bubble is partially conveyed counter to the conveying direction during normal operation, eliminating the need for a traditional venting opening and allowing for improved pump delivery capacity, utilizing a jerky rotary movement of the impeller to displace gas bubbles and enhance flow efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a venting opening is provided in the pump chamber to allow gas to escape, then low-noise operation is achieved, but filtered washing liquid is recirculated back into the pump sump, impairing delivery capacity
Solution Approach 1:
The invention extracts and removes the harmful recirculation of filtered washing liquid from the system by redirecting it to the pump outlet instead of allowing it to return to the pump sump through the venting opening. This eliminates the impairment of delivery capacity while maintaining the noise reduction benefit.
Solution Approach 2:
The invention introduces an intermediary mechanism (the venting opening with modified flow path) that allows gas to escape while preventing the recirculation of washing liquid. The venting opening serves as a mediator that separates the gas venting function from the liquid recirculation path.
2Productivity
If the pump operates continuously in normal mode, then high delivery capacity is achieved, but gas bubbles remain in the pump chamber, causing noise and reduced efficiency
Solution Approach 1:
The invention applies preliminary action by implementing a venting operating mode before normal pump operation to remove gas bubbles from the pump chamber. This preliminary gas removal prevents noise and efficiency reduction during subsequent high-capacity normal operation.
Solution Approach 2:
The invention uses periodic action by alternating between venting operating mode and normal operating mode. The pump periodically switches to venting mode to remove accumulated gas bubbles, then returns to normal mode for high-capacity operation, repeating this cycle to maintain optimal performance.
3Productivity
If a two-directional drive is used to enable bidirectional pump operation for venting, then gas can be effectively removed, but device complexity increases
Solution Approach 1:
The invention applies inversion by reversing the impeller rotation direction from normal operation to venting operation. By controlling the impeller to rotate in reverse during the venting phase, gas bubbles are effectively removed from the pump chamber without requiring complex two-directional drive mechanisms.
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 solution enhances the pumping capacity of the drain pump by preventing the recirculation of filtered washing liquid, allowing for faster and more efficient operation with minimal energy consumption and reduced operational time during the venting process.
Implementation Method 1
the gas bubble is at least partially displaced during the venting operating mode by an annular flow in the pump generated by the pump
Implementation Method 2
utilizing a jerky rotary movement of the impeller to displace gas bubbles and enhance flow efficiency
Data Source
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AI summary
The invention relates to a water-conducting household appliance, particularly a dishwasher, at least comprising a pump (19), by means of which fluid can be pumped in at least one normal operating mode. According to the invention, the pump (19) can be vented by a venting operating mode which can be carried out before the normal operating mode and during which a gas bubble can be pumped against the pumping direction in effect during the normal operating mode at least partially out of a pump chamber (35) of the pump (19) to a fluid pump inlet (31) of the pump (19).