Explosion-Proof Housing Pressure Control via Dual Proportional Valves
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Solution Overview
Problem
Existing devices for operating electrical devices in potentially explosive environments face inefficiencies in gas purging, leading to excessive pressure loads and prolonged operational readiness due to passive exhaust valves and time-dependent control methods.
Innovation Solution
The implementation of a dual control loop system using proportional valves in both the flushing gas inlet and outlet, allowing for real-time regulation of housing pressure and flow rate, eliminating pressure peaks, and enabling constant or variable flow rates to optimize the flushing and operating phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive exhaust valves are used in the flushing gas outlet, then the device structure is simple, but pressure peaks occur and the flushing phase is prolonged
Solution Approach 1:
The patent applies dynamics by replacing passive exhaust valves with active proportional valves that can dynamically adjust their opening degree based on real-time pressure feedback. This allows the system to adaptively control gas flow during the flushing phase, optimizing the balance between structural complexity and flushing efficiency.
Solution Approach 2:
The patent implements feedback control by using pressure sensors to continuously monitor the housing pressure and adjusting the proportional valve opening degree accordingly. This closed-loop control system prevents pressure peaks and optimizes the flushing process, reducing the flushing phase duration while maintaining safe pressure levels.
2Device complexity
If time-dependent control methods are used, then the control system is simple, but gas usage is excessive and pressure loads are high
Solution Approach 1:
The patent replaces time-dependent control with feedback control based on real-time pressure measurements. The proportional valve adjusts its opening degree according to the actual pressure state, allowing the system to terminate the flushing phase as soon as the target pressure is reached, thereby minimizing gas consumption and pressure loads.
Solution Approach 2:
The system transitions from static time-dependent control to dynamic feedback control, where the valve opening degree continuously adapts to the current pressure state. This enables precise control of gas flow, preventing excessive gas usage and reducing peak pressure loads on the housing.
3Reliability
If proportional valves are used in both inlet and outlet, then pressure and flow rate are precisely controlled, but device complexity increases
Solution Approach 1:
The patent segments the control system into two independent control loops: one for the flushing gas inlet and one for the flushing gas outlet. Each loop independently controls a proportional valve based on pressure feedback, allowing precise pressure and flow rate control while maintaining modular system architecture that manages complexity.
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 approach reduces gas usage, minimizes pressure fluctuations, shortens the flushing phase, and ensures rapid operational readiness by adapting to specific application requirements without mechanical changes, thereby enhancing safety and efficiency.
Implementation Method 1
a first control loop R1, with the help of which the flow rate in the flushing gas inlet 2 can be regulated
Implementation Method 2
a second control loop R2, with the help of which the flow rate in the flushing gas outlet 6 can be regulated
Implementation Method 3
a pressure measuring device 10, with which the pressure P in the housing 1 can be measured
Implementation Method 4
a flow measuring device 7 for determining the instantaneous flow rate is integrated
Implementation Method 5
The control values obtained on the basis of these measurement data are forwarded via the data lines 14 to the actuator 5 for controlling the proportional valve 4 in the purge gas inlet 2 and via the data line 15 to the actuator 9 for controlling the proportional valve 8 in the purge gas outlet 6
Data Source
Figure 1
Figure 2~3
AI summary
The device has a pressure measuring device (10) determining actual pressure in housing (1). A measuring and control device (11) detects and processes a measuring value, and controls an inlet valve. An outlet valve in a flushing gas outlet (6) is formed by a proportional valve (8) e.g. flap. The proportional valve, the pressure measuring device and the measuring and control device form a control circuit (R1) for controlling flow rate in the flushing gas outlet. The housing is subjected to pressure encapsulation by flushing gas (3) over a flushing gas inlet (2). An independent claim is also included for a method for operating an electrical device in an explosive environment.