Peristaltic Pump Carrier Rotation for Fluid Metering
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Solution Overview
Problem
Conventional peristaltic pumps suffer from inaccuracies in fluid dosing, including flat spots and pulsating delivery, which affect the precision of fluid delivery in medical and food applications.
Innovation Solution
A peristaltic pump design where the flexible tubing moves relative to a compression roller, with the carrier member rotating about its axis, allowing for precise control of fluid delivery by adjusting the ratio of the compression roller's circumference to the carrier member's circumference, ensuring accurate fluid conveyance through a fraction of the carrier member's circumference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional peristaltic pumps use fixed tubing with rotating rollers, then the pump structure is simple, but fluid delivery accuracy deteriorates due to flat spots and pulsating delivery
Solution Approach 1:
Instead of rotating rollers against fixed tubing, the patent inverts the approach by keeping the roller stationary and rotating the tubing carrier. This inversion eliminates the flat spots and pulsating delivery characteristic of conventional designs, significantly improving fluid delivery accuracy while maintaining reasonable structural complexity
Solution Approach 2:
The patent introduces dynamic rotation of the carrier member holding the flexible tubing, allowing the tubing to move in a circular path around the stationary compression roller. This dynamic configuration enables continuous, smooth fluid delivery without the flat spots caused by fixed tubing positions, resolving the contradiction between delivery accuracy and structural simplicity
2Manufacturing precision
If the compression roller circumference is made smaller relative to the carrier member, then fluid delivery accuracy improves through better metering control, but the device complexity increases
Solution Approach 1:
The patent utilizes the ratio between compression roller circumference and carrier member circumference as a key parameter for controlling fluid delivery accuracy. By optimizing this parameter ratio, the system achieves precise metering of small fluid amounts while managing the associated design complexity through mathematical relationships rather than mechanical 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
This design enhances the accuracy of fluid delivery by allowing precise control over the amount of fluid conveyed, reducing flat spots and pulsation, thereby improving the metering of small fluid amounts in various applications.
Implementation Method 1
A peristaltic pump comprises a fluid inlet and outlet; a carrier member having an outer surface; flexible tubing for conveying a fluid which extends at least partially around the outer surface of the carrier member; and a drivable compression roller
Data Source
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AI summary
A peristaltic pump (1) comprises a fluid inlet and outlet (10); a carrier member (12) having an outer surface; flexible tubing (14) for conveying a fluid which extends at least partially around the outer surface of the carrier member; and a drivable compression roller (16). The carrier member and compression roller can be positioned adjacent one another to compress the flexible tubing therebetween, and the compression roller rotated about an axis of rotation to thereby cause the carrier member and flexible tubing to rotate about an axis of rotation, by which fluid within the flexible tubing can be conveyed along the flexible tubing between the inlet and outlet. Fluid delivery systems including a pump are also disclosed.