Expansible Chamber Pneumatic System for Energy Recovery
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Solution Overview
Problem
Existing systems waste energy by reducing high-pressure shop air to lower pressures using pressure reducing valves, resulting in inefficient use of compressed air, especially in applications requiring lower pressures, leading to significant power loss.
Innovation Solution
An expansible chamber pneumatic system with multiple diaphragm pumps connected in series, where high-pressure air is used to drive each pump in sequence, allowing Process air to be reused and exhausted only at the final stage, thereby minimizing energy waste and optimizing air usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If pressure reducing valves are used to reduce high-pressure air to lower pressures for equipment operation, then equipment can operate at required lower pressures, but significant energy is wasted and power consumption increases
Solution Approach 1:
The system segments the air distribution into multiple pressure levels (high pressure at 125 psig, intermediate pressure at 75-100 psig, low pressure at 0-75 psig) with dedicated compressors for each level. This allows equipment to receive air at the minimum necessary pressure rather than always receiving high-pressure air that must be reduced, eliminating energy waste from pressure reduction while still meeting all pressure requirements.
2Adaptability or versatility
If high-pressure air is compressed to meet maximum pressure requirements of all equipment, then all equipment can be supplied, but equipment operating at lower pressures wastes 25% or more of the power required to generate high-pressure air
Solution Approach 1:
The system divides the pneumatic distribution into separate high-pressure and intermediate-pressure networks with dedicated compressors. High-pressure air (125 psig) serves equipment requiring maximum pressure, while intermediate-pressure air (75-100 psig) from a separate compressor serves equipment operating at lower pressures. This segmentation ensures each piece of equipment receives air at the optimal pressure level, maximizing adaptability while minimizing power consumption for each pressure level.
3Productivity
If a single compressor is sized to meet total pressure and volume requirements of all pneumatic equipment, then all equipment can be supplied, but energy efficiency is reduced due to over-compression for low-pressure applications
Solution Approach 1:
The system replaces a single oversized compressor with multiple smaller dedicated compressors - one high-pressure compressor (125 psig) and one intermediate-pressure compressor (75-100 psig). Each compressor is sized appropriately for its specific pressure level and load requirements, eliminating the energy inefficiency of using a single compressor to over-compress air for low-pressure applications while maintaining the ability to supply all pneumatic equipment.
Solution Approach 2:
The high-pressure air compressor serves dual purposes: it supplies high-pressure air (125 psig) to equipment requiring maximum pressure, and also supplies intermediate-pressure air (75-100 psig) to the intermediate-pressure network. This multi-functionality allows the system to meet all pressure and volume requirements of pneumatic equipment while optimizing energy efficiency by avoiding the need for a separate intermediate-pressure compressor in many cases.
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
This configuration reduces air volume requirements, energy consumption, and pressure differentials, leading to increased efficiency and reduced wear on pumps, while maximizing the use of available energy in the high-pressure air supply.
Implementation Method 1
Each housing including an air chamber and a fluid chamber separated by a movable diaphragm. The diaphragms are connected for reciprocating movement in unison to pump fluid through their respective fluid chambers.
Implementation Method 2
Each pump includes an air direction control (DC) valve actuated by Control air to direct Process air alternately into right and left air chambers, simultaneously releasing used Process air from the other air chamber
Implementation Method 3
Air is pressurized in a compressor and stored in a tank for operation in a range of, typically, 115 to 125 psig
Data Source
AI summary
An expansible chamber pneumatic system, for example a fluid pump system, includes two or more double-acting diaphragm pumps, each with symmetrical left and right pump housings, each housing including an air chamber and a fluid chamber separated by a movable diaphragm. The diaphragms are connected for reciprocating movement in unison to pump fluid through their respective fluid chambers. Each pump includes an air valve actuated by Control air to direct Process air into one of the air chambers, simultaneously releasing used Process air from the other air chamber to thereby move the diaphragms, thereby to pump fluid. A pilot valve directs Control air to the air valve to position the air valve. The pilot valve is responsive to diaphragms reaching their travel limit in one direction to direct Control air to reverse the directions of Process air flow through the air valve to thereby reverse the movement of the pump diaphragms. Control air exhausts through the pilot valve to atmosphere. Process air exhausts through the air valve from one pump to become input or motive air for the next pump.