Blower Filter Power Limiting for Explosive Area Safety
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Solution Overview
Problem
Blower filter devices used in potentially explosive environments face challenges with high power consumption and the need for high voltage, leading to increased risk of ignition and limited battery life, requiring constant connection to a voltage supply and posing safety hazards.
Innovation Solution
A blower filter device with an internal energy storage unit, current limitation device, and sensor array that allows for detachable connection to a voltage supply, limiting current intensity to prevent ignition risks and enabling operation without continuous power from an external source, thus enhancing safety and usability in explosive environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the blower filter device is connected to a voltage supply unit with high power output to meet the high current requirements for uninterrupted operation, then the power supply capability is improved, but the risk of ignition in potentially explosive areas increases due to high current intensity
Solution Approach 1:
The voltage supply system is divided into two independent parts: an external voltage supply unit for charging and an internal energy storage unit for power supply. This segmentation allows the external unit to provide high power for charging without directly connecting high current to the blower motor, thereby reducing ignition risk while maintaining power supply capability.
Solution Approach 2:
The internal energy storage unit acts as an intermediary between the external voltage supply unit and the blower motor. It receives energy from the external supply and releases it to drive the motor, decoupling the high current charging process from the high power motor operation, thus eliminating the ignition hazard associated with direct high current connections.
2Use of energy by moving object
If the battery pack is integrated directly in the blower filter device to provide high currents, then the power consumption requirement is met, but the device complexity increases and battery replacement becomes difficult
Solution Approach 1:
The energy storage function is separated from the main device body through a detachable battery pack design. The battery pack can be easily removed and replaced without tools, simplifying maintenance while still providing the necessary high current for uninterrupted operation of the blower motor.
Solution Approach 2:
The battery pack serves multiple functions: it provides power storage, includes protective circuits for safety, and can be quickly exchanged by the user. This multi-functionality reduces overall device complexity by integrating essential features into a single modular component.
3Reliability
If protective circuits are added to prevent excessively high currents and temperatures, then the safety is improved, but the device complexity increases
Solution Approach 1:
The protective circuits are merged into the battery pack itself rather than being separate components in the main device. This integration consolidates safety functions within the already-complex battery module, minimizing additional complexity while ensuring protection against excessive currents and temperatures.
Solution Approach 2:
The battery pack's protective circuits automatically monitor and protect against hazardous conditions without requiring external control systems. This self-service approach to safety reduces the need for additional control electronics in the main device, thereby limiting the increase in overall device 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
The solution reduces the risk of ignition and allows for extended use in explosive environments by managing current intensity and state of charge, enabling safer and more flexible operation of blower filter devices.
Implementation Method 1
an internal energy storage unit (7), which is connected to the blower unit (5) and to an energy interface (9)
Implementation Method 2
a current limitation device (13), which can be activated and deactivated and which, when activated, is capable of limiting the intensity of a current, which flows from the energy interface (9) to the internal energy storage unit (7), to a predefined current intensity limit
Data Source
AI summary
A blower filter device (3) is connectable to a voltage supply unit (2) and includes a blower unit (5), a filter mount (14), an internal energy storage unit (7), an energy interface (9), a current limitation device (13), a sensor array (16, 17, 18) and a control device (6). The current limitation device is activated upon disconnecting the energy interface from the voltage supply unit. The activated current limitation device limits the intensity of a current from the energy interface to the internal energy storage device. Upon the voltage supply unit being connected to the energy storage device and a predefined deactivating event is detected, the control device deactivates the current limitation device. The deactivating event is based on a charging voltage of the internal energy storage unit and/or on a time period that has elapsed since the connection. A process is provided for operating such a blower filter device.