Compressed Air Unit Drain Valve Control Logic
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Solution Overview
Problem
Existing methods for controlling compressed air units are voluminous, require many valves and connections, and are limited to discharging condensate without considering other system parameters or performing additional functions.
Innovation Solution
A method that controls at least two controllable drain valves based on system parameters such as pressure and liquid levels, ensuring that valves with different feed-side pressures cannot be open simultaneously, allowing for a compact configuration and enabling the valves to perform multiple functions beyond condensate discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple valves and connections are used to discharge condensate from each pressure stage, then condensate discharge function is achieved, but device complexity and volume increase
Solution Approach 1:
The patent applies multi-functionality by enabling drain valves to perform multiple functions: discharging condensate from different pressure stages and providing pressure relief/blow-off functions. The controller manages multiple functions through a single valve system, eliminating the need for separate dedicated valves for each function.
Solution Approach 2:
The patent merges multiple condensate discharge functions into a single drain valve system. Instead of having separate valves for each pressure stage, the invention combines all condensate discharge operations through one or two controllable drain valves managed by a central controller, significantly reducing the number of components.
2Reliability
If separate components are used for pressure relief and condensate discharge, then each function is reliably performed, but device volume and complexity increase
Solution Approach 1:
The drain valves are designed to perform both condensate discharge and pressure relief functions. The controller determines when to open the drain valve based on whether condensate discharge or pressure relief is needed, allowing a single component to serve multiple purposes and reduce overall device volume.
3Ease of operation
If drain valves are controlled based only on local feed-side parameters, then simple control is achieved, but system-wide coordination and safety are compromised
Solution Approach 1:
The controller receives feedback from multiple sources including feed-side parameters (liquid level, local pressure) and system-side parameters (pressure in other stages, overall system state). This multi-source feedback enables coordinated control of drain valves across different pressure stages, ensuring safe operation while maintaining relatively simple control logic.
Solution Approach 2:
The controller acts as an intermediary that coordinates between different pressure stages and drain valves. It processes information from various sensors and makes centralized decisions about valve operation, ensuring system-wide coordination without requiring complex direct communication between all components.
4Productivity
If drain valves are allowed to open simultaneously at different pressure stages, then condensate discharge efficiency is improved, but condensate flow from high to low pressure areas occurs
Solution Approach 1:
The controller monitors pressure conditions at different pressure stages and uses this feedback to control drain valve operation. It determines the appropriate timing for opening drain valves based on pressure differentials, ensuring that valves open in a sequence that prevents harmful condensate flow while maintaining efficient discharge.
Solution Approach 2:
The controller performs preliminary assessment of pressure conditions before opening drain valves. It checks whether opening a drain valve would create harmful pressure differentials that could cause condensate to flow from high to low pressure areas, and only permits valve opening when conditions are safe.
Data Source
AI summary
Method for controlling a compressed air unit which is provided with at least one controllable drain valve (8, 27, 37 or 39), where the above-mentioned drain valve (8, 27, 37 or 39) are controlled at least on the basis of a system parameter which is not a system parameter on the feed side of the drain valve (8, 27, 37 or 39).