Heating Cartridge Sensor Line Placement for Signal Stability
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Solution Overview
Problem
The interaction between changes in operating conditions and temperature signal interference negatively affects the precision of temperature measurement in heating cartridges with temperature sensors, leading to frequent adjustments in electrical operating conditions.
Innovation Solution
A heating cartridge design with a tubular metal sheathing and an electrical heating element, where the temperature sensor supply lines are positioned between the winding form and the metal sheathing, electrically insulated from both, and held in recesses or holes of an insulating element, such as a ceramic molded body, with MgO granulate filling to enhance insulation and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the temperature sensor supply lines are positioned inside the winding form, then the device structure is simpler, but the temperature measurement precision deteriorates due to interference from operating condition changes
Solution Approach 1:
The supply lines of the temperature sensor are extracted from the interior of the winding form and positioned in the space between the winding form and the tubular metal sheathing. This spatial separation removes the supply lines from the high-interference zone around the heating element, thereby reducing electromagnetic interference and improving temperature measurement precision while maintaining structural simplicity.
2Measurement precision
If the supply lines are positioned between the winding form and metal sheathing, then the temperature measurement precision improves, but the device complexity increases
Solution Approach 1:
An insulating element is introduced as an intermediary component between the winding form and the tubular metal sheathing. The supply lines are positioned within this insulating element, which provides both mechanical support and electrical insulation. This intermediary structure organizes the supply lines in a controlled manner, improving measurement precision while managing the increased structural complexity through functional integration.
3Productivity
If frequent changes in operating conditions are made to meet temperature requirements, then the temperature balance is reached faster, but the temperature signal interference increases
Solution Approach 1:
The patent converts the potentially harmful electromagnetic interference from the heating element into a beneficial arrangement by strategically positioning the temperature sensor supply lines in the space between the winding form and metal sheathing. This location, while close to the heating action for rapid response, is electrically isolated through the insulating element, allowing fast heating operations without compromising signal stability. The harmful interference is thus transformed into an opportunity for both rapid heating and accurate measurement.
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 design significantly reduces the negative impact of operating condition changes on temperature sensor signals, improving measurement precision and stability by minimizing interference, especially when all supply lines are guided in this manner.
Implementation Method 1
MgO granulate, which, in one preferred refinement, is also impregnated, especially by the incorporation of solid powdery silicone resin
Implementation Method 2
an electrical heating element—e.g., a heating wire—that is wound on a winding form
Implementation Method 3
at least one temperature sensor with supply lines
Data Source
AI summary
Heating cartridge with a tubular metal sheathing, whose interior houses an electrical heating element that is wound on a winding form and is electrically insulated from the tubular metal sheathing by embedding in an electrically non-conductive insulating material, and at least one temperature sensor with supply lines, wherein at least one supply line, preferably both supply lines, of at least one temperature sensor runs between the winding form and the tubular metal sheathing and is electrically insulated from the winding form and the heating element wound thereon and also from the tubular metal sheathing.