High Temperature Proximity Switch Ceramic Housing
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Solution Overview
Problem
Proximity switches designed for low-heat environments often fail in high-heat environments due to material limitations, leading to switch destruction, degradation, and component failure.
Innovation Solution
The use of ceramic and stainless steel materials in the switch design, along with a two-part housing and crimped conductive contacts, allows for efficient operation in high-heat environments by maintaining electrical conductivity and structural integrity at elevated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials are used in proximity switches, then the switch operates reliably in low-heat environments, but the switch fails, degrades, or destroys in high-heat environments above 350°F
Solution Approach 1:
The patent employs a composite construction combining ceramic housing portions with stainless steel plunger components. The ceramic material provides high-temperature resistance and electrical insulation, while the stainless steel provides mechanical strength and magnetic properties. This composite approach enables the switch to operate reliably in high-heat environments above 350°F where conventional single-material constructions would fail.
2Temperature
If a two-part ceramic housing design is used, then the switch achieves high-temperature resistance and electrical insulation, but the device complexity increases
Solution Approach 1:
The housing is divided into two separate ceramic portions: a first ceramic housing portion and a second ceramic housing portion. This segmentation allows each portion to be optimized for specific functions (electrical insulation and high-temperature resistance) while enabling modular assembly. The segments are joined together to form the complete housing, maintaining the benefits of ceramic material properties without requiring a monolithic complex structure.
3Strength
If stainless steel plunger components are used, then the switch maintains structural integrity at elevated temperatures, but the manufacturing precision requirements increase
Solution Approach 1:
The stainless steel plunger components are designed with specific local properties optimized for their functions: the plunger rod provides mechanical movement, the plunger head engages with the actuator, and the plunger spring provides biasing force. Each component's geometry and material properties are tailored to its specific role, allowing precise control over local characteristics while maintaining overall structural integrity at elevated temperatures.
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 configuration enables reliable and long-lasting operation of proximity switches in high-heat environments, preventing failure and ensuring consistent performance beyond the typical 350°F temperature limit.
Implementation Method 1
a magnetic assembly including a magnet and a yoke, the yoke to form a magnetic circuit with the magnet, the plunger assembly, and the contact
Implementation Method 2
a first deformable metallic sleeve including a proximal end and a distal end, the proximal end crimped to the first contact, the distal end crimped to a first conductor
Data Source
AI summary
High temperature switch apparatus are disclosed. An example apparatus includes a ceramic contact base having an opening therein configured to removably receive a contact, a first ceramic plunger housing portion and a second ceramic plunger housing portion, the first ceramic plunger housing portion including a first protrusion, the second ceramic plunger housing portion including a first recess, the first recess to receive the first protrusion, and a first ceramic contact housing portion and a second ceramic contact housing portion, the first ceramic contact housing portion including a second protrusion and a first cavity, the second ceramic contact housing portion including a second recess and a second cavity, the first ceramic plunger housing portion, the second ceramic plunger housing portion, and the ceramic contact base configured to be coupled in between the first and second cavities when the second recess receives the second protrusion.