Fire and Smoke Actuator Temperature-Dependent Speed Control

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Solution Overview

Problem

Fire and smoke actuators in HVAC systems face challenges in operating effectively at elevated temperatures, which can lead to damage and reduced functionality, particularly in fire and smoke events where high temperatures are encountered.

Innovation Solution

The fire and smoke actuators are designed to adjust their operating speed based on ambient temperature, slowing down at higher temperatures to protect polymeric components and prevent damage, using temperature sensors, drive motors, and drivetrains to control damper positions within a controlled timeframe.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the fire and smoke actuator operates at high speed during manufacturing and installation, then productivity is improved, but reliability deteriorates at elevated temperatures due to damage risk to polymeric components

Engineering Contradiction:

Improveactuator operating speedVSAvoidcomponent integrity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The actuator employs a temperature-dependent speed control mechanism that dynamically adjusts operating speed based on ambient temperature conditions. During manufacturing and installation at low temperatures, the actuator operates at high speed for productivity. During fire events at elevated temperatures, the actuator automatically reduces speed to protect polymeric components, thus resolving the contradiction between productivity and reliability across different operating conditions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the operating parameter (speed) based on temperature conditions. A temperature sensor monitors ambient temperature and triggers speed reduction when threshold values are exceeded. This parameter change protects polymeric components from thermal degradation while maintaining high-speed operation during normal conditions, effectively balancing productivity and reliability

Inventive Principle:

Principle #35Parameter changes

2Loss of time

If the actuator operates at high speed during fire events, then response time is improved, but the polymeric components may be damaged due to elevated temperatures

Engineering Contradiction:

Improvedamper actuation timeVSAvoidthermal damage to polymeric components

Core Design Contradiction:

Loss of timeVSObject-affected harmful factors

Solution Approach 1:

The actuator incorporates a temperature sensor that provides continuous feedback on ambient temperature conditions. When the sensor detects temperatures exceeding predetermined thresholds during fire events, the control system receives feedback and automatically reduces operating speed. This feedback mechanism protects polymeric components from thermal damage while still achieving timely damper actuation within regulatory timeframes

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system implements protective speed reduction before thermal damage can occur to polymeric components. By monitoring temperature in advance and preemptively reducing speed when thresholds are approached, the actuator prevents thermal degradation of vulnerable components while maintaining adequate response time for damper actuation during fire events

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 adaptive speed control ensures the integrity of the actuator components and maintains effective damper operation, reducing the risk of damage and ensuring reliable air flow management during both normal and elevated temperature conditions.

Implementation Method 1

A temperature sensor is configured to sense an operating temperature of the fire and smoke actuator

Methodology Applied

Scientific EffectTemperature sensing:

Data Source

PatentUS11224777B2Fire and smoke actuator with temperature-dependent operating speed

Publication Date: 2022.01.18 HONEYWELL INTERNATIONAL INC

AI summary

A fire and smoke actuator includes a temperature sensor for sensing an operating temperature of the fire and smoke actuator, a drive motor, an actuator output for coupling to the damper in order to move the damper between the open position and the closed position and a drivetrain that is operably coupled between the drive motor and the actuator output. The drive motor, when activated, is configured to actuate the actuator output, via the drivetrain, to move the damper between the open position and the closed position. A drive circuit is operably coupled to the drive motor and the temperature sensor and is configured to activate the drive motor to move the damper between the open position and the closed position at a non-zero speed that is based, at least in part, on the operating temperature sensed by the temperature sensor.