Filter Element Visual Reminder System for Turbomachines
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Solution Overview
Problem
Existing solutions do not provide a reliable mechanical guarantee of filter mounting in turbomachine oil and fuel circuits, leading to potential engine malfunctions when the filtering device is operated without a filter.
Innovation Solution
A filtering device with a movable plate and indicator pin system, where the plate is guided by the filter support and held in position by compression springs, and the indicator pin is magnetically attracted to the clogging valve, projecting or retracting based on the presence or absence of a filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a drain plug or leak holes are used to detect filter absence, then the detection method is simple, but the leak is only detected after the turbomachine is put into service
Solution Approach 1:
The indicator pin is positioned in advance to project from the cover when the filter is absent, providing a visual warning before the turbomachine is started. This preliminary indication allows operators to correct the missing filter issue before operation begins, avoiding the delayed detection problem of leak-based methods.
Solution Approach 2:
The patent replaces the fluid-leak-based detection mechanism (drain plug or hole leakage) with a mechanical indicator system. The indicator pin's position is mechanically determined by the presence or absence of the filter, providing direct visual feedback without requiring fluid circulation or system pressurization.
2Reliability
If the indicator pin is held retracted by magnetic attraction, then the filter presence is indicated, but additional magnetic components increase device complexity
Solution Approach 1:
The magnetic field acts as an intermediary force between the indicator pin and the filter assembly. Rather than direct mechanical contact, the magnetic attraction provides a non-contact holding mechanism that reliably indicates filter presence while minimizing mechanical wear and complexity in the connection between moving and stationary parts.
3Reliability
If the plate is held against the filter by compression springs, then the plate position reliably indicates filter presence, but the spring force must be precisely controlled
Solution Approach 1:
The patent uses the compression force parameter of the springs as a design variable to achieve reliable plate positioning. By carefully selecting the spring constant and pre-compression, the system ensures that the plate is held firmly against the filter when present, yet can be displaced when the filter is removed, providing clear positional indication without requiring excessive manufacturing precision.
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 visual detection of the absence of a filter before starting the turbomachine, preventing potential malfunctions and ensuring reliable filter mounting through a mechanical indication system.
Implementation Method 1
a magnet positioned at one end of the clogging valve; an indicator pin having a magnetic surface, being translationally movable relative to the cover and connected to the cover via a second compression spring with a second compression force F2, the magnetic surface facing the magnet
Data Source
AI summary
A filtering device for a turbomachine, includes a filter support; a removable filter cooperating with the filter support; a cover; an indicator pin; a plate that is translatably movable relative to the cover and relative to the indicator pin, the plate being translatably movable between two positions: a first position such that the plate bears against the removable filter and the indicator pin is in a retracted position, a second position such that the plate is remote from the cover due to the absence of the removable filter and the indicator pin is in an extended position.