Peristaltic Pump Guide Channel for Hose Stability
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Solution Overview
Problem
Existing peristaltic pumps face difficulties in handling the pump segment during manual insertion due to the design of the guide surface, leading to potential hose damage and flow rate fluctuations.
Innovation Solution
The introduction of guide surfaces that rotate with the rotor, forming a circular segment-like guide channel with the support surface to securely fix the hose segment, ensuring a constant delivery volume and minimizing hose abrasion, with a designed clearance fit and controlled curvature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a circular segment-shaped guide surface is provided in the center between each pressure roller to fix the pump segment, then the pump segment is stabilized during operation, but handling during manual insertion becomes more difficult
Solution Approach 1:
The guide surface is divided into multiple guide surfaces arranged in pairs adjacent to each other in the circumferential direction on either side of the squeezing element. This segmentation allows the pump segment to be stabilized through distributed contact points while maintaining open spaces that facilitate manual insertion and handling.
2Ease of operation
If the pump segment is not fixed during operation, then manual insertion is easier, but the pump segment moves against the conveying direction causing hose damage and flow rate fluctuations
Solution Approach 1:
The guide surfaces are strategically positioned adjacent to the squeezing elements where they are most needed for stabilization. The guide surfaces extend over specific central angles that provide sufficient contact to prevent backward movement and stabilize flow rate, while leaving other areas open for easy manual insertion. This localized approach ensures reliability without compromising ease of operation.
3Reliability
If guide surfaces are provided adjacent to squeezing elements to stabilize the hose, then delivery volume remains constant and hose damage is prevented, but the contact surface increases causing greater abrasion
Solution Approach 1:
The guide surfaces extend over central angles that provide sufficient stabilization to maintain constant delivery volume and prevent hose damage, but do not extend beyond what is necessary. The guide surfaces are positioned to provide just enough contact to stabilize the hose during the squeezing operation, minimizing unnecessary contact and reducing abrasion while maintaining reliability.
4Shape
If the guide surface extends over a large central angle to stabilize the hose, then the hose curvature is better controlled, but material consumption increases
Solution Approach 1:
The guide surfaces are designed with specific central angle parameters that optimize the balance between hose curvature control and material consumption. By carefully selecting the extension angle of each guide surface, the design achieves sufficient hose stabilization and curvature control with minimal material usage, avoiding both insufficient control and excessive material consumption.
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 solution stabilizes the hose segment, maintains consistent flow, reduces hose damage, and allows easy manual insertion by providing a circumferential free space for unlocking the rotor cover.
Implementation Method 1
guide surfaces that rotate with the rotor and are arranged and designed adjacent to both sides of the squeezing element in the circumferential direction in such a way that they form a circular segment-like guide channel with the support surface in which the hose segment can be radially fixed with a predetermined clearance fit
Implementation Method 2
a positive displacement pump in which the medium to be pumped is pressed through a hose by external mechanical deformation thereof
Implementation Method 3
the hose segment, referred to as a pump segment, arranged between the low-pressure side and the high-pressure side is deformed, in particular squeezed together, between a support surface of a pump bed and a rotor rotating relative to the latter
Implementation Method 4
an elastically deformable fluid line in the form of a hose segment
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A peristaltic pump, in particular for pumping fluid in a device for extracorporeal blood treatment, has a pump housing in which a rotor (10) rotatable about a rotor axis (A) with at least two circumferentially offset squeezing elements (20) is received and which has a support surface (30) extending arcuately about the rotor axis (A) and radially spaced from the rotor (10), which is designed to support a hose segment that can be inserted radially between the rotor (10) and the support surface (30).To extend the service life of the pump and to reduce fluctuations in the pump volume, guide surfaces (46, 48) rotating with the rotor (10) are provided, which are arranged and designed adjacent to both sides of the squeezing element (20) in the circumferential direction such that they form a circular segment-shaped guide channel with the support surface (30), in which the hose segment can be radially fixed with a predetermined clearance fit.