Hose Reel Pump Lockable Rotor Mechanism
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Solution Overview
Problem
Current hose roller pumps for extracorporeal blood treatment require complex handling steps for rotor insertion and lack a simple mechanism for manual operation in case of power failure, leading to inefficiencies and increased risk of contamination.
Innovation Solution
A hose roller pump design with a rotor that can be axially and non-rotatably locked onto a drive shaft using a single swiveling locking element, allowing for easy insertion and manual operation, reducing the number of handling steps and minimizing component assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radial and axial form fit with bayonet locks and additional locking elements is used to transmit torque, then torque transmission is reliable, but the number of handling steps increases to at least four steps
Solution Approach 1:
The locking element combines both radial locking (for torque transmission) and axial locking (for rotor positioning) functions into a single integrated component. When the locking element is rotated into its locked position, it simultaneously engages with the drive shaft radially to prevent rotation and axially to prevent displacement, eliminating the need for separate locking mechanisms and reducing handling steps.
Solution Approach 2:
The locking element serves multiple functions: it acts as a torque transmission interface, a rotational lock, an axial positioning mechanism, and even provides a crank function for manual operation. This multi-functionality reduces the overall complexity of the system and minimizes the number of components that need to be handled during rotor installation.
2Reliability
If a locking system with multiple locking elements is used to secure the rotor, then the rotor is securely locked, but the complexity of the system increases
Solution Approach 1:
Multiple locking functions (radial locking and axial locking) are merged into a single locking element that performs both functions simultaneously through its geometric design and rotation mechanism, thereby securing the rotor reliably while keeping the system simple.
3Reliability
If the rotor is designed with a complex locking mechanism, then the rotor can be securely attached, but the ease of cleaning is reduced
Solution Approach 1:
The locking element is designed to be easily removable and extractable from the rotor assembly, allowing the rotor to be quickly detached from the drive shaft for cleaning purposes. The simple geometric locking mechanism can be disengaged by rotating the locking element, enabling rapid rotor removal without complex tools or procedures.
4Ease of operation
If a single locking element is used to simplify handling, then the number of handling steps is reduced, but the locking reliability may be compromised
Solution Approach 1:
The single locking element incorporates both radial and axial locking functions, ensuring that when locked, it provides secure attachment in both directions. The geometric design includes engagement surfaces that prevent both rotation and axial displacement, maintaining high locking reliability while simplifying the number of handling steps.
Solution Approach 2:
The locking element and drive shaft feature asymmetric geometric profiles with specific engagement surfaces and shapes that ensure reliable locking in the locked position while allowing easy insertion and locking in the unlocked position. The asymmetric design prevents accidental disengagement and ensures proper orientation during assembly.
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 simplifies the rotor insertion process to three steps, ensures secure locking for operational stability, and allows for manual pumping in case of power failure, while maintaining ease of cleaning and reducing parts costs.
Implementation Method 1
A rotor of the pump located within the running surface then moves with its outer edges or rollers attached to it along the tube segment, locally compressing the tube and thus enabling blood to be pumped through the tube segment
Data Source
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AI summary
The pump has a pump housing (10) comprising a rotor (30) rotated within a curved running surface. A locking element i.e. lever, is provided at the rotor and pivoted between two positions. Geometries of a drive shaft and the locking element are formed such that the rotor is displaced and rotated in one position of the locking element relative to the drive shaft, while the rotor is coupled with the drive shaft in another position of the locking element both in an axial direction and in a rotation direction by a form closure.