Peristaltic Pump Pressure Sensing via Track Displacement
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Solution Overview
Problem
Existing peristaltic pumps face challenges in monitoring fluid pressure without direct contact, which increases cost and failure risk due to the use of flexible diaphragms and disrupts fluid flow, shortening the pump's usable life.
Innovation Solution
A peristaltic pump system that measures fluid pressure indirectly by monitoring the movement of a track relative to a rotor using sensors, without contacting the fluid, and adjusts operational parameters to maintain desired pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a flexible diaphragm is incorporated into the tube set to measure pressure, then pressure measurement capability is improved, but the cost of the tube set increases significantly
Solution Approach 1:
The patent uses the tube set itself as an intermediary element that serves dual purposes: fluid transport and pressure measurement. By monitoring the displacement of the tube set under fluid pressure, the system obtains pressure data without requiring separate measurement components, thereby avoiding the cost increase associated with flexible diaphragms while maintaining measurement capability
Solution Approach 2:
Instead of using a physical flexible diaphragm that contacts the fluid, the patent creates a measurement system that copies the pressure effect by observing the elastic deformation of the tube set. The tube set's displacement under pressure provides a proxy measurement that eliminates the need for expensive specialized components
2Measurement precision
If a flexible diaphragm is incorporated into the tube set to measure pressure, then pressure measurement capability is improved, but the usable life of the pump head is shortened
Solution Approach 1:
The tube set acts as an intermediary that naturally deforms under pressure without compromising pump head longevity. This approach avoids the wear and failure issues associated with flexible diaphragms while still enabling pressure measurement through displacement monitoring
Solution Approach 2:
The tube set's inherent elastic properties are utilized for measurement purposes. The tube naturally responds to pressure changes through elastic deformation, and this self-generated displacement signal is used for measurement, eliminating the need for separate fragile measurement components that would reduce pump head lifespan
3Measurement precision
If a flexible diaphragm is incorporated into the tube set to measure pressure, then pressure measurement capability is improved, but the failure risk increases due to more parts and connections
Solution Approach 1:
The tube set serves as a multi-functional intermediary that eliminates the need for separate flexible diaphragm components. By using the existing tube structure for both fluid transport and pressure measurement, the system reduces the number of parts and connections, thereby lowering failure risk while maintaining measurement capability
Solution Approach 2:
The tube set is designed to perform multiple functions simultaneously: fluid transport and pressure measurement. This multi-functionality eliminates the need for separate specialized components like flexible diaphragms, reducing system complexity and failure points while enabling pressure monitoring
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
Enables accurate fluid pressure measurement and extends the pump's useful life by avoiding direct fluid contact, reducing costs, and minimizing failure risks.
Implementation Method 1
a biasing device configured to resiliently bias the track towards the rotor to compress a flexible tube between the track and the rotor during operation of the pump
Implementation Method 2
at least one sensor configured to measure movement of the track relative to the rotor during operation of the pump
Data Source
Figure 1
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Figure 3
AI summary
A peristaltic pump (10) comprises a rotor (16), a track (20) and a biasing device (26) configured to resiliently bias the track (20) towards the rotor (16) to compress a flexible tube between the track (20) and the rotor (16) during operation of the pump (10. At least one sensor (30) is configured to measure movement of the track (20) relative to the rotor (16) during operation of the pump (10). A control (40) is in communication with the sensor (30) and is configured to determine fluid pressure in the tube based on movement of the track (20) measured by the sensor (30).