Bleed Valve Pneumatic Controller With Fuel-Cooled Anti-Icing Layout
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Solution Overview
Problem
Conventional pneumatic controllers for turbine engines face challenges due to high temperatures and icing issues, limiting their installation in the central compartment and causing operational failures, as they require cooled air and are prone to water condensation and icing.
Innovation Solution
A hydropneumatic controller with liquid supply means maintains coil temperature and prevents liquid penetration, using a mobile piston and chamber design with fluid supply means, allowing for continuous circulation of fuel or oil to stabilize the solenoid valve and prevent icing, enabling installation in the central compartment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pneumatic controller is installed in the central compartment of a turbine engine, then it can control the bleed valve directly, but the high temperature and water condensation cause icing issues and operational failures
Solution Approach 1:
The controller is divided into two separate bodies: a first body containing the pneumatic actuator and a second body containing the solenoid valve. This segmentation allows the solenoid valve to be protected from harmful environmental factors while maintaining control functionality.
Solution Approach 2:
A mobile member acts as an intermediary between the solenoid valve and the pneumatic actuator, transmitting control signals while isolating the solenoid valve from the harsh environment in the central compartment.
2Productivity
If air is taken from the primary flow for the pneumatic controller, then control air is available, but the temperature exceeds 200°C which degrades the solenoid valve insulation
Solution Approach 1:
The controller separates the high-temperature air intake function from the temperature-sensitive solenoid valve, allowing hot control air to be available while protecting the solenoid valve through physical separation and thermal management.
Solution Approach 2:
The mobile member and chamber structure serve as thermal intermediaries, managing the transmission of control air while protecting the solenoid valve from excessive temperatures that would degrade the insulation.
3Device complexity
If a conventional pneumatic controller is used, then the structure is simple, but it cannot prevent liquid penetration and is prone to icing
Solution Approach 1:
By dividing the controller into separate bodies with distinct functions, the design achieves both structural simplicity and improved reliability. The first body handles pneumatic functions while the second body protects the solenoid valve from liquid penetration and icing.
Solution Approach 2:
The mobile member serves as a protective intermediary that prevents liquid penetration while maintaining the simple overall structure of the controller.
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 provides a reliable and icing-resistant pneumatic controller that can maintain operation in high-temperature environments, reducing weight and mechanical risks while ensuring the bleed valve remains in a fail-safe open position, minimizing air leaks, and allowing for thermal stabilization.
Implementation Method 1
continuous circulation of fuel or oil to stabilize the solenoid valve and prevent icing
Implementation Method 2
pneumatic controller for controlling a bleed valve... air inlet port and an air outlet port... mobile piston and chamber design with fluid supply means
Data Source
AI summary
Controller for controlling a bleed valve including a first body with an internal cavity connected to an air inlet port and an air outlet port, a second body including a chamber, a mobile member in the cavity and in the chamber, connecting the two bodies. The member is mobile between a position whereby the ports fluidly communicate and a position whereby the ports are isolated, the member further including two pistons housed in the chamber and defining in this chamber at least two spaces. The controller also includes a fluid supply for at least one of the spaces for the purpose of moving the pistons in the chamber.