Pneumatic Valve Soft Start Mechanism

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Solution Overview

Problem

Pneumatic valves in aircraft environmental control systems face challenges in controlling flow rates and pressures due to rapid pressure decay, leading to uncontrollable opening of valves and loss of flow regulation, especially when transitioning from closed to open positions.

Innovation Solution

A pneumatic valve design incorporating a modulating chamber, a damping chamber, and a supply chamber with a piston assembly that includes a damping piston bypass, allowing for controlled flow regulation by restricting flow between the supply and damping chambers, thereby preventing rapid pressure decay and ensuring controlled valve opening.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If a pneumatic valve is designed to open quickly from closed position, then response time is improved, but pressure decay becomes uncontrolled and flow regulation is lost

Engineering Contradiction:

Improvevalve opening speedVSAvoidflow regulation control

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The valve opening process is segmented into two distinct phases: a rapid initial opening phase that quickly transitions the valve from closed to partially open position, followed by a controlled modulation phase that maintains stable flow regulation. This segmentation allows the valve to benefit from both fast response and reliable control without compromising either function.

Inventive Principle:

Principle #1Segmentation

2Power

If pneumatic pressure is supplied from a high pressure source, then valve actuation power is improved, but rapid pressure decay occurs causing uncontrollable valve opening

Engineering Contradiction:

Improvevalve actuation powerVSAvoidpressure stability

Core Design Contradiction:

PowerVSStability of the object's composition

Solution Approach 1:

A soft start mechanism is implemented that prepares the pneumatic system before full pressure application. The valve begins opening with restricted pressure flow to prevent sudden pressure decay, then transitions to full pressure for complete opening. This preliminary controlled action prevents the harmful rapid pressure decay while maintaining the ability to achieve full valve actuation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system incorporates a cushioning effect during the initial valve opening phase where pressure is gradually applied rather than instantly fully pressurized. This cushioning prevents the shock and rapid pressure decay that would occur with direct high pressure application, protecting the system stability while still enabling powerful valve actuation.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Productivity

If flow rate is increased to improve system response, then productivity is improved, but pressure control becomes difficult leading to loss of regulation

Engineering Contradiction:

Improvesystem response rateVSAvoidpressure control

Core Design Contradiction:

ProductivityVSStress or pressure

Solution Approach 1:

The valve system dynamically adjusts its operating characteristics based on the phase of operation. During initial opening, the system allows higher flow rates for rapid response. Once opened, it transitions to a controlled modulation mode where flow rate is dynamically regulated to maintain stable pressure control. This dynamic adaptation enables both high productivity during transition and stable pressure control during operation.

Inventive Principle:

Principle #15Dynamics

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 design provides controlled and gradual valve opening, preventing rapid pressure decay and maintaining controllability of flow rates, enhancing the stability and regulation of environmental control systems.

Implementation Method 1

a damping piston bypass that provides a restricted flow passage between the supply chamber and the damping chamber when the damping piston is located in the passageway

Methodology Applied

Scientific EffectFluid flow restriction:

Implementation Method 2

The driving portion of the valve transforms pneumatic pressure into mechanical power for operating or actuating a control mechanism

Methodology Applied

Scientific EffectPneumatic pressure to mechanical force transformation:

Implementation Method 3

a modulating chamber for sending and receiving fluid through a first chamber port

Methodology Applied

Scientific EffectPressure-driven fluid flow: Pressure Gradient

Data Source

PatentUS9933085B2Integrating valve with soft start

Publication Date: 2018.04.03 HAMILTON SUNDSTRAND CORP

AI summary

A valve includes a modulating chamber for sending and receiving fluid through a first chamber port, a supply chamber, and a damping chamber for sending and receiving a second fluid through a damping chamber port. The valve also includes a passageway between the damping chamber and the supply chamber, and a piston assembly movable within the valve, wherein the piston assembly is configured to open and close a flow control device. The piston assembly includes a rod, a modulating piston attached to the rod movable within the modulating chamber, a supply piston attached to the rod movable within the supply chamber, and a damping piston attached to the rod movable within the passageway and the supply chamber. The piston assembly also includes a damping piston bypass that provides a restricted flow passage between the supply chamber and the damping chamber when the damping piston is located in the passageway.