Gas Mixing Pump Variable Injection Section
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Solution Overview
Problem
Existing gas mixing pumps with variable injection sections are limited in their ability to adjust air pressure at the outlet independently of supply pressures and exhibit poor tolerance to characteristic variations, restricting their application and adaptability to different aircraft types and high-temperature environments.
Innovation Solution
A gas mixing pump with a variable injection section incorporating a pneumatic actuator and a power circuit with a leakage valve, allowing adjustable leakage to control the pressure delivered to the actuator, enabling precise modulation of HP/IP gas proportions and adjustable setpoint pressure, and an electric control system to manage the leakage valve for fine pressure regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas mixing pump with variable injection section is designed with fixed characteristics during manufacture, then it can provide a constant nominal pressure at the outlet, but it cannot be adjusted to provide different pressure values and exhibits poor tolerance to characteristic variations
Solution Approach 1:
The patent applies the dynamics principle by making the injection section variable through a movable piston controlled by a pneumatic actuator. The piston position can be dynamically adjusted to change the injection section area, allowing the pump to adapt to different pressure requirements. The actuator receives control pressure that moves the piston between closed and open positions, enabling continuous adjustment of the mixing ratio and outlet pressure.
Solution Approach 2:
The patent implements parameter changes by varying the control pressure supplied to the pneumatic actuator. By changing the control pressure parameter, the piston position is adjusted, which in turn modifies the injection section area and the proportion of high-pressure gas mixed with low-pressure gas. This allows the system to adapt to different operating conditions and pressure requirements.
2Ease of manufacture
If the pump is designed with fixed pipe sections and spring stiffness, then the nominal pressure is determined during manufacture, but any variation between theoretical and real characteristics leads to modification of the nominal pressure
Solution Approach 1:
The patent applies feedback by using the actual outlet pressure to adjust the piston position dynamically. The system continuously monitors the outlet pressure and modifies the injection section to compensate for deviations from the nominal pressure. This feedback mechanism allows the system to adapt to manufacturing tolerances and maintain accurate pressure output despite variations in pipe sections and spring stiffness.
3Temperature
If a pneumatic actuator is used to control the injection section, then it can withstand high temperatures and use available energy resources, but the pump cannot be controlled to provide pressure different from the nominal value
Solution Approach 1:
The patent implements parameter changes by varying the control pressure supplied to the pneumatic actuator. By changing the control pressure parameter, the piston position is adjusted, which in turn modifies the injection section area and the proportion of high-pressure gas mixed with low-pressure gas. This allows the system to adapt to different operating conditions and pressure requirements while maintaining the ability to withstand high temperatures.
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 pump can deliver air at a configurable pressure, independent of supply pressures, with improved tolerance to characteristic variations, enabling installation on various aircraft and operation in high-temperature environments, and allows for precise pressure adjustment, enhancing aircraft performance and engine efficiency.
Implementation Method 1
a pneumatic actuator comprising a movable piston arranged in the first HP air supply line, the movable piston being adapted to be moved between a position, called the closed position, in which it prevents the circulation of HP air towards the mixing chamber, and a position, called the open position, in which it allows the circulation of HP air to the mixing chamber
Implementation Method 2
an air mixing chamber, opening into the mixing chamber, a first air supply pipe to the chamber, called HP air, brought to a first pressure, opening into the mixing chamber, a second pipe supplying the enclosure with air, called IP air, brought to a second pressure, said second pressure being lower than said first pressure
Data Source
Figure 1
Figure 2
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AI summary
The invention relates to a pump including: a gas mixing housing (1); ducts (2, 3) for supplying said housing (1) with HP and IP gases and giving into said mixing housing (1); an outlet duct (3)for the mixed gases; a pneumatic actuator (10) provided in said HP-gas supply duct (2) including a mobile piston connected to a stopper (12) whose position in said duct (2) determines a passage section of the HP gas towards said mixing housing (1); a control chamber (13) of said mobile piston adapted to be fed under pressure for determining the position of the mobile piston; a pneumatic circuit provided between a pressure source and said control chamber (13); characterised in that the pneumatic circuit includes at least one leak valve (22) adapted for generating a leak in the pneumatic circuit for modifying the pressure supplied to said control chamber (13).