Fire Detector Window Cleaning via Intermittent Gas Pulses
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Solution Overview
Problem
Existing methods for cleaning optical entry windows of fire detectors are inefficient in removing dust and powder deposits, leading to incomplete or erroneous signal transmission due to high energy consumption and unreliable air-flushing systems.
Innovation Solution
An intermittent gas stream with high-intensity pressure pulses is applied to the optical entry window, controlled by a valve and a control unit to ensure effective cleaning with reduced energy consumption, using a pressurized-air system and a monitoring system to adjust the cleaning frequency based on contamination levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous air stream or gas stream is used to clean the optical entry window, then the cleaning action is provided, but the gas consumption is high and energy costs are considerable
Solution Approach 1:
The patent applies periodic action by using intermittent pressure pulses instead of continuous gas flow. The control unit activates the gas supply in periodic cycles, creating high-intensity pressure pulses that effectively remove contamination while allowing gas supply to be interrupted during clean periods, thereby significantly reducing overall gas consumption while maintaining cleaning effectiveness.
Solution Approach 2:
The patent changes the parameter of gas flow from continuous low-pressure to intermittent high-pressure pulses. By varying the pressure parameter dynamically through controlled pulses, the system achieves more effective cleaning action per unit of gas consumed, resolving the contradiction between cleaning effectiveness and gas consumption.
2Power
If pressurized air is used for cleaning, then cleaning intensity is improved, but energy consumption increases
Solution Approach 1:
The system uses periodic pressure pulses instead of continuous pressurized air supply. The control unit timing the intermittent activation creates high-intensity cleaning moments when energy is applied, followed by rest periods, thereby achieving effective cleaning intensity while minimizing overall energy consumption through duty-cycle control.
Solution Approach 2:
The system dynamically adjusts the pressurized air supply by switching between active and inactive states. This dynamic control allows the system to apply high power only when needed for cleaning, rather than maintaining constant high power, thus reducing overall energy consumption while preserving cleaning intensity when required.
3Reliability
If air cushion is constantly maintained to prevent deposits, then protection is provided, but continuous gas consumption occurs
Solution Approach 1:
Instead of maintaining a continuous air cushion, the patent employs periodic pressure pulses that temporarily create protective gas layers during critical periods. The control unit times these pulses to provide protection when contamination risk is highest, then interrupts supply to reduce consumption, maintaining reliability while eliminating continuous gas waste.
Solution Approach 2:
The system provides protective function only when needed rather than continuously. The periodic activation allows the optical entry window to serve itself during clean periods without requiring continuous external gas supply, reducing substance loss while maintaining protection during vulnerable periods.
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 method effectively removes contamination from the optical entry window with low gas consumption, ensuring reliable signal transmission and reducing operational costs by using a controlled, high-intensity gas stream that targets and flushes away dust and particles with minimal energy expenditure.
Implementation Method 1
discharging an intermittent gas stream from at least one gas exit opening (7) onto a surface of the optical entry window (1)
Data Source
AI summary
A method is provided for cleaning an optical entry window (1) of a fire detector (2), wherein an intermittent gas stream is discharged from at least one gas exit opening (7) onto the surface of the optical entry window (1) of the fire detector (2), wherein the intermittent gas stream having a number of pressure pulses (14) is discharged onto the optical entry window (1), and to an apparatus for cleaning an optical entry window. The method has the advantage that the optical entry window of a fire detector can be cleaned from contamination intermittently and corresponding to the intensity of contamination with a matched and low consumption of gas.