dishwasher
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Solution Overview
Problem
Existing dishwashers face challenges in maintaining consistent detergent supply due to changes in power supplied to the electric motor, detergent formulation, wear, and hardening of components, leading to deviations in detergent amount.
Innovation Solution
A dish washer design that controls detergent supply based on the number of revolutions of a roller using a magnetic body and a roller sensor, minimizing deviations by calculating the number of signal changes to determine the preset detergent amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the detergent supply amount is controlled by the operating time of the electric motor, then the structure is simple, but the detergent supply amount deviates when power changes or detergent formulation changes
Solution Approach 1:
The patent replaces the mechanical control method (operating time based on motor RPM) with a magnetic sensing system. A magnetic body attached to the roller and a roller sensor detect the actual number of roller revolutions, substituting mechanical assumptions with direct magnetic field-based measurement to determine detergent supply amount.
Solution Approach 2:
The patent implements feedback by using the roller sensor to detect the actual number of roller revolutions and comparing it with the target value. The system adjusts the detergent supply control based on the detected actual revolutions, creating a closed-loop control system that compensates for variations in power supply and detergent viscosity.
2Reliability
If the RPM of the electric motor is controlled using a BLDC motor, then the detergent supply amount can be controlled, but the structure becomes more complex and manufacturing cost increases
Solution Approach 1:
The patent extracts the control function from the motor itself and places it in the roller sensor system. Instead of using a complex BLDC motor to control RPM, the invention uses a simple motor with a magnetic body and roller sensor to detect and control the actual detergent supply based on roller revolutions, separating the drive function from the control function.
Solution Approach 2:
The patent creates a simplified control approach by copying the essential function of RPM control through magnetic revolution detection. Instead of implementing complex electronic motor control, the system uses a magnetic field-based revolution counter that replicates the control outcome with simpler, more cost-effective components.
3Reliability
If the number of roller revolutions is detected using a magnetic body and roller sensor, then detergent supply consistency is improved, but additional components are added
Solution Approach 1:
The patent replaces complex mechanical revolution detection mechanisms with a magnetic field-based sensing system. The magnetic body attached to the roller interacts with the roller sensor to detect revolutions, eliminating the need for mechanical encoders or complex mechanical counters while achieving reliable revolution detection.
4Manufacturing precision
If wear or hardening of the tube occurs over time, then the initial control accuracy is maintained, but detergent supply deviation increases
Solution Approach 1:
The patent implements continuous feedback through the roller sensor that detects actual roller revolutions regardless of tube condition. This feedback mechanism allows the system to compensate for wear and hardening effects by adjusting control based on actual measured revolutions rather than relying on initial calibration that degrades over time.
Solution Approach 2:
The patent attaches a magnetic body to the roller as a preliminary measure to enable reliable revolution detection. This magnetic marker provides a consistent reference point for the roller sensor to accurately count revolutions, establishing a robust detection foundation that remains effective despite subsequent wear or hardening of surrounding components.
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 approach ensures consistent detergent supply regardless of power changes, detergent formulation, wear, or friction variations, simplifying the structure and reducing manufacturing costs.
Implementation Method 1
a magnetic body attached to the roller and a roller sensor that detects the number of revolutions of the roller based on the magnetic field generated by the magnetic body
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
The present disclosure relates to a dish washer that minimizes a possibility of deviation in a detergent supply amount regardless of a change in power supplied to an electric motor by controlling the detergent supply amount based on the number of revolutions of a roller of a detergent pump. In particular, the detergent pump (230) includes a tube (232) configured to guide the detergent discharged from the container (280) to the washing space (21), a roller (233) configured to pressurize the tube (232) and revolve around a revolution axis to allow the detergent inside the tube to flow, a pump motor (238) configured to generate a driving force to move the roller (233), and a roller sensor (2391) configured to sense a location of the roller (233) and generate an output signal corresponding to the location of the roller (233).