Heat Alarm Unit Centralized Sensor Design
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Solution Overview
Problem
Existing heat alarm units face challenges in optimizing sensor responsiveness and reducing costs while maintaining cosmetic improvements and consistent temperature measurements.
Innovation Solution
A heat alarm unit design featuring a centrally located heat sensor with a shuttle and touch pad assembly, where the heat sensor is axially biased and protected by a thermal barrier, allowing for enhanced heat detection and reduced thermal conduction, along with control circuitry and optional electrical test switches for reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If heat sensors are scattered circumferentially about the housing, then the device structure is simplified, but sensor responsiveness and measurement consistency deteriorate
Solution Approach 1:
The patent transitions from a symmetric circumferential arrangement of multiple heat sensors to an asymmetric centralized configuration with a single heat sensor positioned at the center of the housing. This central positioning, combined with the asymmetric placement of the shuttle mechanism and touch pad assembly, creates a more focused and responsive heat detection system while simplifying the overall structure.
2Measurement precision
If the heat sensor is centrally located, then measurement consistency improves, but thermal conduction from housing increases
Solution Approach 1:
The patent introduces the shuttle mechanism as an intermediary component between the centrally located heat sensor and the housing. The shuttle, which moves in response to touch pad activation, creates a dynamic thermal barrier that isolates the heat sensor from thermal conduction through the housing while maintaining the benefits of central positioning for consistent measurements.
Solution Approach 2:
The shuttle mechanism provides dynamic isolation rather than static insulation. When the touch pad is pressed, the shuttle moves to allow heat sensor access; when released, it returns to a position that thermally isolates the sensor from the housing. This dynamic adjustment optimizes both thermal isolation and sensor accessibility.
3Reliability
If multiple heat sensors are used, then detection reliability improves, but device cost and complexity increase
Solution Approach 1:
The patent extracts the heat sensor from a multi-sensor circumferential arrangement and positions it centrally within the housing. This single centralized sensor, combined with the dynamic shuttle mechanism that controls access to the sensor, achieves reliable heat detection without the complexity and cost of multiple sensors distributed around the housing.
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 provides more consistent and responsive heat detection, reduces product costs, and enhances the robustness of the heat alarm unit, ensuring effective temperature monitoring and alarm activation.
Implementation Method 1
the electrical heat sensor lead rigidly attached to the collet
Implementation Method 2
the base portion functions as a thermal barrier, or heat shield, between the chamber and an outside environment
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A heat alarm unit includes a housing and a button assembly. The housing has a central axis and defines an opening disposed substantially normal to the housing. The button assembly is exposed through the opening and is constructed and arranged to move with respect to the housing. The button assembly has a support structure and a heat sensor supported by the support structure.