Heat Detector With Concave Reflective Surface
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Solution Overview
Problem
Conventional heat alarm devices have limitations in quickly detecting temperature changes due to the thermal mass of their bodies and the need for protection from accidental contact, which can delay response times to heat sources like fires.
Innovation Solution
A heat alarm apparatus with a heat sensing module featuring a concave reflective surface on the sensor mounting panel, a dark-colored surface with embossed features, and a protective cage that allows free air circulation, enhancing heat absorption and reflection towards the central heat sensor for faster temperature detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor is centrally located and protected by a large cage to ensure thermal mass symmetry and protection, then the sensor is protected from damage and accidental contact, but the response time to heat detection is delayed due to thermal mass and air circulation restrictions
Solution Approach 1:
The patent employs a concave reflective surface (curved geometry) on the sensor mounting panel to focus and redirect thermal radiation toward the centrally located sensor. This curved surface design enhances heat detection efficiency without requiring the sensor to be positioned closer to the housing, thus maintaining both protection and rapid response.
2Productivity
If the protective cage is made large relative to the sensor to allow free air circulation, then air flow is improved for faster detection, but the thermal mass of the cage impacts the sensor response
Solution Approach 1:
The patent introduces a concave reflective surface as an intermediary element between the incoming thermal radiation and the sensor. This reflective surface focuses and redirects heat toward the sensor, enhancing detection speed without requiring the cage to be larger or the sensor to be exposed to direct thermal mass effects.
3Illumination intensity
If the sensor mounting panel has a light-colored surface, then the aesthetic appearance is improved, but the heat absorption and response time are reduced
Solution Approach 1:
The patent specifies that the sensor mounting panel should have a dark-colored surface (black or dark grey) to maximize heat absorption. This color choice directly enhances the panel's ability to absorb thermal radiation and transfer it to the sensor, thereby reducing response time while maintaining functional aesthetics.
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 design significantly reduces response times to temperature changes, enabling quicker detection of heat sources and improved electrical safety while maintaining the alarm's compact size and symmetry, facilitating easier operation, especially for users with restricted mobility.
Implementation Method 1
heat reflected by the concave reflective surface of the sensor mounting panel is reflected in the direction of the heat sensor
Implementation Method 2
By maintaining a dark colour for the surface the response time of the sensor to a change in heat of the environment in which it is placed, either radiated heat from a nearby heat source or of the air temperature, is increased
Data Source
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AI summary
A heat sensing module for a heat alarm apparatus comprises a base section having a concave surface, protection means, a heat sensor, and a control circuit configured to detect a temperature rise at the heat sensor and output an alarm signal in response thereto. A sensing part of the heat sensor is located in a space formed between the concave surface of the base section and the protection means. The concave surface assists with reflecting, radiating and absorbing heat, thereby increasing the speed at which the heat sensor registers a change in temperature.