Blower Filter Respirator Pressure Monitoring
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Solution Overview
Problem
Blower filter respirator systems face challenges in monitoring and maintaining overpressure in the face part without data links, which are prone to disturbances and require complex and expensive designs.
Innovation Solution
A blower filter respirator system with a pressure sensor on the outlet side of the blower unit, a control unit that determines a desired pressure value based on the face part/tube combination properties, and generates an error signal if the measured pressure drops below the desired value, eliminating the need for a data line along the air feed line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a data link (wired or wireless) is used to transmit pressure data from the face mask to the blower filter device, then pressure monitoring is enabled, but the system becomes prone to disturbances (cable rupture, contact problems, radio transmission disturbances)
Solution Approach 1:
The pressure measurement function is extracted from the face mask and relocated to the blower filter device. The pressure sensor is now integrated into the air feed line near the blower outlet, separating the measurement function from the face mask structure. This eliminates the need for data transmission links between the mask and device.
Solution Approach 2:
The air feed line itself serves as an intermediary medium for pressure measurement. Instead of using separate data transmission channels (wired or wireless), the system uses the air feed line's physical properties (pressure) as the measurement medium, with the pressure sensor detecting pressure differences within the line.
2Reliability
If a pressure-measuring line is arranged from the face mask to the blower filter device, then pressure monitoring is enabled, but the air feed line design becomes complicated and expensive
Solution Approach 1:
The pressure measurement function is merged with the existing air feed line structure. The pressure sensor is integrated into the air feed line at the blower outlet, combining air delivery and pressure measurement functions in a single component rather than requiring separate measuring lines.
Solution Approach 2:
The air feed line serves dual purposes: delivering breathable air to the user and providing the measurement medium for pressure monitoring. The system uses its own operational parameter (air pressure within the feed line) for self-diagnosis and monitoring.
3Measurement precision
If a pressure sensor is arranged in the face mask to monitor overpressure, then real-time pressure monitoring is enabled, but a data link between the mask and blower filter device is required
Solution Approach 1:
Instead of placing the pressure sensor in the face mask and transmitting data to the blower device, the sensor is inverted to the opposite location - integrated into the air feed line at the blower outlet. This reverses the traditional measurement architecture, eliminating the need for data transmission.
Solution Approach 2:
The pressure measurement function is extracted from the face mask assembly and relocated to the blower filter device. This separation removes the dependency on data links between the mask and device while maintaining measurement capability.
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
Ensures reliable overpressure monitoring and alerts users to unsafe operating states, preventing harmful air from entering the face part without the need for data links, thus enhancing user safety and simplifying system design.
Implementation Method 1
A pressure sensor is arranged on the outlet side of the blower unit and is configured to measure a pressure difference of the breathing air on the outlet side of the blower unit and the ambient air, as a current pressure value
Data Source
AI summary
A blower filter respirator system (1) has a filter element (3) for filtering ambient air (33), a blower unit (30) and a face part (7) with a tube element (9)—face part/tube combination (79)—for feeding an amount of breathing air (37) to a user (100). A pressure sensor (8) is on an outlet side (35) of the blower unit (30) measuring breathing air pressure values (81) by detecting a pressure difference on the outlet side (35) of the blower unit (30) against the ambient air (33). A control unit (5) is configured to operate the blower unit (30) and control breathing air (37) and is configured to determine a desired pressure value (83) for current operation with the face part/tube combination (79) from operation-related properties (530) of the blower unit (30) and specific properties of the face part/tube combination (79) and for comparing with the current pressure value (81).