Peristaltic Pump Replaceable Displacement Element
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Solution Overview
Problem
Peristaltic pumps have a short tube service life due to mechanical deformation, requiring frequent and laborious tube replacements, which involves dismantling the entire pump for self-blocking action.
Innovation Solution
A two-part displacement element structure allows the second part to move relative to the first part parallel to the rotor axis, enabling tube removal and replacement without disassembling the pump, with support members to guide the tube and maintain its position without deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the peristaltic pump is designed with self-blocking action using a single displacement element, then the pump can operate continuously without valves, but the tube must be completely dismantled for replacement
Solution Approach 1:
The displacement element is divided into two separate parts: a first part that remains fixed to the rotor and a second part that can be detached. This segmentation allows the tube to be accessed and replaced without dismantling the entire pump, while the first part maintains the self-blocking function during continuous operation.
Solution Approach 2:
The second part of the displacement element is designed to be dynamically movable relative to the first part. During operation, the second part is positioned to engage the tube for pumping; during tube replacement, it can be moved away to allow tube access, enabling easy maintenance while preserving continuous operation capability.
2Device complexity
If the displacement element is made as a single integrated unit, then the structure is simple, but the tube cannot be easily removed without disassembling the pump
Solution Approach 1:
The displacement element is segmented into a first part fixed to the rotor and a second part that can be detached. This segmentation increases structural complexity slightly but enables easy tube replacement by allowing the second part to be moved away from the tube without disassembling the entire pump.
Solution Approach 2:
The second part of the displacement element, which contains the displacement member, can be extracted or moved away from the first part when tube replacement is needed. This extraction capability allows the tube to be accessed and replaced easily while the first part remains in place, balancing structural simplicity with maintenance ease.
3Ease of operation
If the second part of the displacement element is moved parallel to the rotor axis, then the tube can be removed without pump disassembly, but the operative planes of the displacement members change
Solution Approach 1:
The second part of the displacement element is designed to be dynamically positionable relative to the first part along the rotor axis. When tube replacement is needed, the second part is moved parallel to the rotor axis to change its operative plane, allowing tube access. During pumping operation, it is repositioned to align the operative planes for proper pumping action.
Solution Approach 2:
The solution introduces movement in a new dimension (parallel to the rotor axis) to resolve the contradiction. By moving the second part along the rotor axis, the operative plane changes, allowing tube removal without pump disassembly. This dimensional change enables easy maintenance while preserving the pumping function when repositioned.
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 improves the durability of the peristaltic pump by allowing direct force transmission through the rotor and simplifies tube changes, reducing labor and costs associated with frequent replacements.
Implementation Method 1
the tube is mechanically deformed and a conveyed medium disposed in the tube is displaced in the direction of the casing outlet
Implementation Method 2
the displacement members slide or roll on the tube so that the tube is mechanically deformed
Implementation Method 3
a rotor which is rotatable about a rotor axis. The consequence of this is that, in the rotary movement of the rotor, each displacement member performs a movement in an operative plane
Implementation Method 4
direct force transmission through the rotor
Data Source
AI summary
A peristaltic pump includes a casing having a bottom, cover and wall forming a pump chamber, a tube connecting a casing inlet to a casing outlet arranged within the pump chamber, and a displacement element having at least two displacement members. The tube is arranged between the casing wall and the displacement element in such a way that due to rotation of the rotor the displacement members roll on the tube so the tube is squashed together so that a medium to be conveyed which is in the tube is displaced in the direction of the casing outlet. The displacement element has a first part fixed to the rotor and a second part which can be reciprocated between an operative position and a change position.