Multi-Roller Peristaltic Pump Head with Cam Locking
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Solution Overview
Problem
Rotary peristaltic pumps face issues with maintaining proper spacing between the occlusion bed and pinch rollers, leading to improper installation, flapping tubing, excessive wear, and poor performance, especially when handling multiple tubes under high pressures and cyclic loading.
Innovation Solution
A multi-roller peristaltic pump head design featuring an arcuate occlusion bed with a cam locking handle and a rotor assembly including a central shaft and planetary shafts, along with composite bushings for improved durability and pressure handling, and a quick connect feature for secure mounting to a pump housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the spacing between the occlusion bed and pinch rollers is reduced to increase compressive force, then pump performance is improved, but tubing wear increases and tubing life decreases
Solution Approach 1:
The occlusion bed is segmented into multiple discrete occlusion points spaced along the rotor assembly, allowing distributed compression of the tubing. This segmentation enables the pump to maintain adequate compressive force for effective pumping while distributing the mechanical stress over multiple locations, thereby reducing wear at any single point and extending tubing life.
2Ease of operation
If the occlusion bed is made removable for ease of installation, then ease of operation is improved, but stability under high pressure and cyclic loading deteriorates
Solution Approach 1:
The occlusion bed incorporates a dynamic locking mechanism that transitions from a removable state during installation to a secured state during operation. The locking feature engages with the rotor assembly to prevent displacement under high pressure and cyclic loading, while allowing easy removal when needed for maintenance or tube changes, thus providing both ease of operation and operational stability.
3Productivity
If multiple tubes are compressed by multiple rollers simultaneously, then productivity is improved, but pressure distribution uniformity deteriorates
Solution Approach 1:
Each roller in the multi-roller assembly is designed with locally optimized characteristics, including varying diameters and positions, to compensate for differences in tube placement and compression needs. This local quality adjustment ensures uniform pressure distribution across multiple tubes while maintaining high productivity through simultaneous compression of all tubes.
4Stability of the object's composition
If the occlusion bed is secured firmly to prevent movement, then stability is improved, but ease of tube installation and removal deteriorates
Solution Approach 1:
The occlusion bed features a dynamic securing mechanism that provides firm stabilization during pump operation to prevent movement and ensure consistent compression, while allowing easy release and reconfiguration during tube installation and removal. The locking and unlocking features enable the system to transition between stable operational mode and accessible maintenance mode.
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 ensures stable operation by securely locking the occlusion bed, maintaining even pressure across multiple tubes, reducing wear, and providing a durable solution for continuous fluid flow with reduced noise and enhanced resistance to movement and high-pressure conditions.
Implementation Method 1
The locking handle may include a bar extending between a pair of cam members, each cam member including a cam slot that engages a respective pin extending from the base and the end cap
Implementation Method 2
Each planetary shaft may be connected to a planetary gear in meshed engagement with the central gear
Implementation Method 3
The peristaltic pump head may include a pair of composite bushings in each of the base and the end cap rotatably retaining the central shaft
Implementation Method 4
A typical peristaltic pump has a rotor assembly with pinch rollers that apply pressure to the flexible tubing at spaced locations to provide a squeezing action on the tubing against an occlusion bed
Implementation Method 5
pinch rollers that apply pressure to the flexible tubing at spaced locations to provide a squeezing action on the tubing
Data Source
AI summary
A peristaltic pump may include a rotor rotatably mounted between a base of the peristaltic pump head and an end cap of the peristaltic pump head. The peristaltic pump may include an arcuate case between the base and the end cap partially surrounding the rotor. The peristaltic pump may include an arcuate occlusion bed removably mounted between the base and the end cap. The arcuate case and the arcuate occlusion bed form a cylindrical body around the rotor. The peristaltic pump may include a locking handle hingedly mounted to the arcuate occlusion bed, wherein the locking handle includes a bar extending between a pair of cam members, each cam member including a cam slot that engages a respective pin extending from the base and the end cap.