Balanced Flapper Electro-Pneumatic Converter
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Solution Overview
Problem
Existing electro-pneumatic converters rely on spring stiffness and friction forces, which are susceptible to environmental factors and orientation changes, leading to deviations in the correlation between fluid pressure and electrical signal, and are costly to manufacture due to tight tolerances.
Innovation Solution
A balance beam electro-pneumatic converter with a freely rotating pivot and bearings, where the flapper is unconstrained by a spring, and a counterweight balances the flapper to regulate fluid pressure, using a coil and magnet assembly to align and stabilize the flapper, and a shim to ensure flat contact with the nozzle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a spring is used to counter the flapper weight, then zero pressure correlates with zero current, but the spring stiffness depends on environmental factors such as temperature and fatigue causing correlation drift
Solution Approach 1:
The patent replaces the spring-based counterweight system with a gravitational counterweight system. A counterweight member is positioned on the balance beam such that its gravitational force exactly balances the flapper weight, creating a frictionless equilibrium point at zero pressure. This eliminates the environmental sensitivity of spring stiffness while maintaining the zero-pressure correlation accuracy.
Solution Approach 2:
The patent replaces the elastic mechanical system (spring) with a gravitational mechanical system (counterweight). The spring's elastic force, which varies with temperature and fatigue, is substituted by the constant gravitational force of a counterweight, providing stable and predictable balancing force regardless of environmental conditions.
2Ease of operation
If a screw is used to retain the flapper, then the flapper is held in position, but friction forces between the screw and flapper impede movement and change due to environmental factors
Solution Approach 1:
The patent replaces the screw-retention mechanical system with a magnetic retention system. A magnet is positioned to hold the flapper in the desired position without physical contact, eliminating friction forces entirely. The magnetic force can be precisely controlled to provide the necessary holding force without the sliding friction that occurs with screw mechanisms.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the retention mechanism and the flapper. Instead of direct mechanical contact through a screw, the magnetic field acts as a non-contact intermediary to hold the flapper in position, eliminating the friction interface while maintaining positioning capability.
3Measurement precision
If tight tolerances are used for flapper manufacturing to ensure proper alignment, then signal-pressure correlation is accurate, but manufacturing costs are prohibitively expensive
Solution Approach 1:
The patent divides the alignment function into separate components: the balance beam provides mechanical alignment, the counterweight provides gravitational balancing, and the magnet provides positional retention. This segmentation allows each component to be manufactured with standard tolerances while achieving accurate overall alignment, eliminating the need for prohibitively expensive tight-tolerance flapper manufacturing.
Solution Approach 2:
The patent introduces a magnet as an intermediary alignment mechanism. Instead of relying on precise mechanical alignment of the flapper itself, the magnet serves as an adjustable intermediary that can be positioned to achieve the correct flapper orientation and gap, allowing standard-tolerance components to be assembled into a precision system.
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 solution maintains accurate signal-pressure correlation across various orientations and environmental conditions, reduces manufacturing costs, and minimizes the impact of temperature and friction, ensuring reliable and repeatable fluid pressure regulation.
Implementation Method 1
The pivot is a freely rotating pivot with bearings
Implementation Method 2
the flapper is balanced about the pivot
Implementation Method 3
using a coil and magnet assembly to align and stabilize the flapper
Data Source
Figure 1~2A
Figure 2B
Figure 3~4
AI summary
A balance beam electro-pneumatic converter (100, 400) adapted to couple to a conduit with a fluid is provided. The balance beam electro-pneumatic converter (100, 400) includes a nozzle (184) adapted to fluidly couple to the conduit, and a flapper (130) rotatably coupled to the nozzle (184) via a pivot (140) wherein the flapper (130) is adapted to regulate a pressure of the fluid and balance about the pivot (140).