Gear-Driven Water Flow Detector Timer Mechanism
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Solution Overview
Problem
Water flow detectors using air bleed timers are prone to false alarms due to pressure fluctuations, as the duration of water flow affects the timing of the switch state change, and may not accurately detect flow cessation if water stops before the air bleed is complete.
Innovation Solution
A gear-driven timer mechanism is introduced, where the lever connected to a paddle controls the movement of a cam, with the distance the gear rack travels determining the time for the cam to switch states, allowing for adjustable bleed times to mitigate false alarms and ensure accurate detection of water flow duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air bleed time is extended to reduce false alarms from pressure fluctuations, then the reliability of the detector is improved, but the water flow must continue for a longer duration to ensure the switch orients to the second state
Solution Approach 1:
A gear-driven timer mechanism is introduced as an intermediary between the lever and the cam. The timer includes a gear rack that the lever moves, which in turn rotates a cam to actuate the switch assembly. This intermediary timing mechanism allows the system to maintain a longer effective bleed time for reliability while ensuring the switch orients to the second state after a predetermined duration, resolving the contradiction between reliability and water flow duration requirement.
2Measurement precision
If the air bleed timer is used to control the cam movement, then the detector can respond to water flow duration, but false alarms occur when water flow stops before the air bleed is complete
Solution Approach 1:
The gear-driven timer mechanism performs preliminary timing action by pre-configuring the gear rack and cam arrangement. The lever must move the gear rack a predetermined distance to rotate the cam and actuate the switch assembly. This preliminary timing setup ensures the switch only orients to the second state after the water flow has persisted long enough to trigger the timer, preventing false alarms from premature or incomplete flow conditions.
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 gear-driven timer system provides more reliable and adjustable detection of water flow, reducing false alarms from pressure fluctuations and ensuring accurate state changes of the switch assembly, even if water flow stops before the intended bleed time is completed.
Implementation Method 1
The paddle is moved from a first position to a second position by the flow of water in a riser pipe of a fire sprinkler assembly
Implementation Method 2
The time it takes the cam to move depends upon the rate at which air is set to bleed out of an air chamber formed by a diaphragm
Data Source
AI summary
A water flow detector has a gear driven timer responsive to the movement of a lever. The lever is connected to a paddle and the paddle is responsive to the flow of water in a pipe. The detector via the gear driven timer responds to the flow of water in the pipe.