Peristaltic Pump Optical Leak Detection
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Solution Overview
Problem
Peristaltic pumps face challenges in detecting leaks within the pump housing, leading to potential fluid accumulation and increased wear on tubes and rollers, with existing leak detection systems being complex and costly to replace.
Innovation Solution
A peristaltic pump design incorporating an optical sensor with an emitter, receiver, and reflector element, where the reflector is submerged in a reservoir within the pumphead, allowing for detection of fluid presence through changes in reflected radiation, triggering the opening of a valve to prevent fluid buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a normally closed valve with complex leak detection system is used, then fluid accumulation is prevented, but device complexity increases and replacement cost increases
Solution Approach 1:
The patent extracts the leak detection function from a complex integrated system and implements it using a simple optical sensor that detects the presence of fluid in the reservoir. This separates the detection function from the valve control system, allowing for simpler overall architecture while maintaining reliability.
Solution Approach 2:
The optical sensor system automatically detects leaks and triggers valve opening without requiring complex external control systems. The emitter and receiver continuously monitor the reservoir, and the system self-activates the drainage function when fluid is detected, eliminating the need for sophisticated leak detection algorithms.
2Reliability
If a normally closed valve is used to prevent lubricant drainage, then lubricant is retained, but fluid accumulation risk increases when leak detection fails
Solution Approach 1:
The optical sensor provides continuous feedback about the presence of fluid in the reservoir. When fluid is detected, the system provides feedback to open the valve, creating a closed-loop control system that automatically responds to leak conditions while normally keeping the valve closed to retain lubricant.
Solution Approach 2:
The optical sensor system is continuously monitoring the reservoir before a leak occurs, allowing the valve to be opened in advance when fluid is detected. This preliminary detection and response prevents excessive fluid accumulation before it becomes a problem.
3Adaptability or versatility
If complex leak detectors are integrated into pumpheads, then leak detection capability is provided, but pumphead replacement cost increases
Solution Approach 1:
The patent implements a simple, inexpensive optical sensor system that can be integrated into disposable pumpheads. The emitter, receiver, and reflector are basic components that are much cheaper than complex electronic leak detectors, allowing for cost-effective replacement of pumpheads after use.
Solution Approach 2:
The patent replaces complex mechanical or electronic leak detection systems with a simple optical detection system using an emitter, receiver, and reflector. This substitution dramatically reduces the complexity and cost of the detection mechanism while maintaining effective leak detection 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
This solution simplifies leak detection, reduces the risk of fluid accumulation, and lowers the cost of replacing pumpheads by integrating the optical sensor components into the drive unit, allowing for more efficient and cost-effective operation.
Implementation Method 1
the reflector element being arranged on the pumphead such that when the pumphead is connected to the drive unit, radiation emitted by the emitter is reflected by the reflector element towards the receiver
Implementation Method 2
the reflector element being configured such that immersion of at least part of the reflector element in liquid varies the amount of radiation reflected towards the receiver
Data Source
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AI summary
A peristaltic pump comprising a drive unit (1) and a pumphead (2) comprising a pressing element (48). The pumphead (2) is connectable to the drive unit (1) such that, when connected, the pressing element (48) is driveable by the drive unit (1) to exert a peristaltic action on a tube (52) arranged within the pumphead (2). The pumhead further comprises an optical sensor, wherein the optical sensor comprises an emitter (110) and a receiver (112) which are mounted on the drive unit (1) and a reflector element (53) mounted on the pumphead (2). The reflector element (53) is arranged on the pumphead (2) such that when the pumphead (2) is connected to the drive unit (1), radiation emitted by the emitter (110) is reflected by the reflector element (53) towards the receiver (112).