HVAC Smoke Detector with Integrated Pressure Sensor
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Solution Overview
Problem
Conventional smoke detectors installed in HVAC ducts require inconvenient and time-consuming manual testing using external pressure sensors, making regular testing challenging and often neglected due to resource constraints.
Innovation Solution
A smoke detector design that includes a housing with inlet and outlet ports, an emitter, a receiver, and a sensor to detect airflow pressure differential and mass flow, allowing for in situ functional testing without external sensors, using a controller to trigger notifications for out-of-range conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external pressure sensors are used for testing smoke detectors in HVAC ducts, then measurement precision is improved, but ease of operation deteriorates due to time-consuming manual installation and removal
Solution Approach 1:
The patent integrates the pressure sensing function directly into the smoke detector housing by incorporating a pressure differential sensor that measures differential pressure between the inlet and outlet ports. This merging of the testing sensor into the detector itself eliminates the need for separate external pressure sensors, allowing testing to be performed in-situ without manual installation or removal of external equipment.
Solution Approach 2:
The smoke detector performs its own functional testing using the integrated pressure differential sensor and mass flow sensor. The controller automatically monitors airflow parameters and triggers notifications when out-of-range conditions are detected, enabling the device to self-test without requiring external testing equipment or manual intervention by service technicians.
2Measurement precision
If manual testing procedures are used for multiple smoke detectors, then measurement precision is maintained, but productivity deteriorates due to the onerous nature of testing multiple detectors
Solution Approach 1:
Each smoke detector equipped with integrated sensors performs automatic self-testing, eliminating the need for manual testing of each individual detector. The controller continuously or periodically monitors airflow parameters and automatically triggers notifications when out-of-range conditions are detected, enabling simultaneous monitoring of multiple detectors without requiring service technician intervention for each one.
Solution Approach 2:
The integrated sensors provide continuous feedback to the controller about airflow conditions. When out-of-range conditions are detected, the controller automatically triggers notifications, creating a closed-loop feedback system that enables proactive monitoring and eliminates the need for scheduled manual testing of multiple detectors.
3Reliability
If smoke detectors are installed in HVAC ducts for smoke detection, then detection capability is improved, but ease of operation deteriorates due to the complexity of regular testing
Solution Approach 1:
The patent combines the smoke detection function with the airflow monitoring function in a single integrated device. The pressure differential sensor and mass flow sensor are integrated into the smoke detector housing, allowing the device to simultaneously perform smoke detection and airflow parameter monitoring without requiring separate testing equipment or procedures.
Solution Approach 2:
The smoke detector performs automatic functional testing using integrated sensors, eliminating the need for manual testing procedures. The controller automatically monitors airflow parameters and triggers notifications when out-of-range conditions are detected, enabling the device to self-test and maintain operational reliability without requiring service technician intervention.
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
Enables easier and more frequent functional testing of smoke detectors within HVAC ducts, reducing the need for manual technician intervention and improving detection accuracy by ensuring airflow velocity is within the proper range, thus enhancing smoke detection capabilities.
Implementation Method 1
a photo-electric smoke detector that detects smoke using light reflection principles
Implementation Method 2
The receiver is configured to receive light reflected by ambient materials in the airflow passing through the chamber
Implementation Method 3
The sensor is configured to detect at least one of a pressure differential and a mass flow of the airflow
Data Source
AI summary
A smoke detector and method for testing a smoke detector are provided. The smoke detector includes a housing defining a chamber, an emitter, and a receiver. The housing includes an inlet port and an outlet port configured to allow an airflow to pass through the chamber. The emitter is configured to emit light into the chamber. The receiver is configured to receive light reflected by ambient materials in the airflow passing through the chamber. The smoke detector includes an entry point and an exit point, defining a channel therebetween. At least a portion of the airflow passes through the channel. The channel is in fluid communication with a sensor. The sensor is configured to detect at least one of a pressure differential and a mass flow of the airflow. The smoke detector and method for testing the smoke detector enable in situ testing of the smoke detector.