Appliance comprising knob assembly
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Solution Overview
Problem
Existing cooking appliance knobs face misalignment issues due to assembly tolerance, leading to degraded appearance quality and operation failures, particularly in composite cooking appliances with multiple burners, where the alignment of fire power controlling knobs and timers becomes complex, causing confusion and safety risks.
Innovation Solution
A fire power controlling knob assembly with a knob ring that includes a support structure to stabilize the knob, a joint to absorb positional errors, and a sensor system using Hall sensors to accurately measure rotation, ensuring precise alignment and operation, while allowing for fine adjustment of gas flow rates without separating the appliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a knob is directly connected to a valve assembly, then the structure is simple, but assembly tolerance causes misalignment and operation failure
Solution Approach 1:
The knob assembly is divided into separate components: a knob body, a support structure with supporting pipes, and a valve assembly. The knob shaft is separated from the valve shaft, allowing each component to be manufactured independently and assembled with tolerance compensation, thereby maintaining reliability while managing complexity.
Solution Approach 2:
A support structure with supporting pipes is introduced as an intermediary between the knob and the valve assembly. This support structure provides a stable mounting position for the knob shaft, isolating it from misalignment caused by valve assembly tolerance, thus ensuring reliable operation without requiring direct connection.
2Adaptability or versatility
If multiple burners are arranged in a composite cooking appliance, then cooking versatility is improved, but knob alignment becomes complex and causes confusion
Solution Approach 1:
The support structure with supporting pipes serves multiple functions: it provides stable support for the knob shaft, ensures proper alignment with the front panel, isolates tolerance accumulation, and maintains consistent spacing. This universal support structure can be applied to all burners in a composite cooking appliance, simplifying the overall alignment system while maintaining versatility.
Solution Approach 2:
The support structure is pre-installed and fixed to the front panel before the valve assembly is installed. This preliminary action establishes a stable reference framework that guides the subsequent installation of valve assemblies, ensuring consistent alignment across multiple burners without requiring complex adjustment procedures.
3Manufacturing precision
If the knob is fixed rigidly to prevent rotation, then alignment is maintained, but fine adjustment of gas flow rate becomes difficult
Solution Approach 1:
The connection between the knob shaft and valve shaft is designed to be dynamically adjustable rather than rigidly fixed. The support structure allows the knob shaft to be positioned with high precision during assembly, while the valve shaft can be independently adjusted for fine-tuning gas flow rate, combining precision alignment with operational flexibility.
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 enhances the reliability and safety of the cooking appliance by preventing misalignment, improving appearance quality, and ensuring accurate operation, reducing the risk of gas leakage and enhancing user convenience through precise control and display of fire power and timer settings.
Implementation Method 1
a sensor system using Hall sensors to accurately measure rotation
Data Source
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AI summary
A knob assembly includes a front panel, a knob located at a front side of the front panel and configured to rotate based on operation by a user, a knob shaft that is coupled to the knob and that extends through the front panel, a supporting pipe that receives the knob shaft and that supports the knob shaft, the supporting pipe being configured to maintain a position relative to the front panel, a valve configured to control supply of gas to the appliance, a valve shaft connected to the valve and configured to control the valve to adjust a flow rate of gas based on rotation of the valve shaft, and a joint that couples the knob shaft to the valve shaft and that is configured to transfer at least one of a rotational motion or a linear motion of the knob shaft to the valve shaft.