Free-Rotating Roller Peristaltic Pump Design
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Solution Overview
Problem
Conventional peristaltic pumps are complex, require many parts, and often suffer from excessive pressure leading to premature wear of resilient tubes, making them costly to maintain and operate.
Innovation Solution
A peristaltic pump design featuring a rotor with freely rotating rollers that wedge against a recessed step, providing consistent squeezing pressure without excessive force, using materials like UHMWPE, PTFE, and Nylon for efficient and durable operation, and incorporating a spacer tube to maintain roller alignment and reduce pulsations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional peristaltic pumps use fixed rollers to facilitate flow through resilient tube, then pumping function is achieved, but device complexity increases and excessive pressure causes premature wear
Solution Approach 1:
The roller is designed to rotate freely on the rotor rather than being fixed, allowing it to adapt dynamically to the resilient tube during compression. This rotational freedom prevents excessive pressure buildup and reduces wear on the tube while maintaining effective pumping action.
Solution Approach 2:
The roller's free rotation creates a self-regulating pressure mechanism where the roller naturally adjusts its contact pressure with the resilient tube based on the tube's elasticity and the pumping requirements, eliminating the need for complex pressure control systems.
2Productivity
If conventional peristaltic pumps use multiple parts to facilitate pumping, then pumping function is achieved, but maintenance cost and operational complexity increase
Solution Approach 1:
The roller is directly integrated with the rotor structure, eliminating the need for separate mounting mechanisms, bearings, and adjustment devices. This merging of components simplifies the overall device structure while maintaining effective pumping functionality.
Solution Approach 2:
The rotor structure serves multiple functions: it provides the rotational drive mechanism, supports the roller, and facilitates the roller's movement along the resilient tube. This multi-functionality reduces the number of separate components needed in the pump system.
3Power
If conventional peristaltic pumps apply high pressure to resilient tube, then pumping force is increased, but tube wear accelerates and service life decreases
Solution Approach 1:
The free-rotating roller mechanism changes the pressure application parameter from static high pressure to dynamic controlled pressure. The roller's rotation allows it to distribute pressure more evenly and prevent concentration of excessive force on any single point of the resilient tube.
Solution Approach 2:
The system creates a natural feedback loop where the roller's rotation is influenced by the resilient tube's elasticity and compression resistance, automatically adjusting the pressure applied to maintain effective pumping without causing excessive wear.
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 design achieves efficient fluid flow with reduced pulsations, longer tube life, simpler maintenance, and lower operational costs by ensuring consistent and controlled pressure on the resilient tube, while maintaining the rotor's stability and preventing premature wear.
Implementation Method 1
the resilient tube undergoing both compression and returning to its original state
Implementation Method 2
returning to its original state as with resilient tubes
Implementation Method 3
The friction of the roller against the resilient tube causes the roller to index into the rotor step
Data Source
AI summary
A peristaltic pump device includes a resilient tube secured in a pump housing with a rotor having rollers squeezing against the resilient tube facilitating the pumping of a liquid or gas. A cylindrical rotor rotates in a bore provided in the pump housing. The rotor has steps in which rollers freely slide and rotate. As the rotor rotates, the rollers also rotate and are slidingly held in the rotor step thereby frictional contact with the compressing resilient tube and consequently the liquid or gas within goes out of the resilient tube. The pump is inexpensive to build, reliable, and by design promotes the long life of the resilient tube as compared to existing roller type peristaltic pumps.