Rotary Pump Deformable Ring Recess Reduces Stress
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Solution Overview
Problem
Existing orbital pump designs face challenges in reducing mechanical loading and stress on the pump ring, leading to potential leaks and inefficiencies due to direct compression and expansion mechanisms.
Innovation Solution
The introduction of a clamping element with a recess in the pump ring allows for partial decoupling between the clamping element and the pump ring, reducing mechanical loading and stress by altering the deformation behavior, and incorporating a pump ring support recess to facilitate easier rotation and reduce mechanical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pump ring is directly compressed and expanded by the eccentric, then the pump chamber volume changes to deliver fluid, but the mechanical loading and stress on the pump ring increases leading to potential leaks
Solution Approach 1:
The pump ring is segmented into a first portion and a second portion that can deform independently relative to each other. This segmentation allows the pump ring to accommodate the eccentric's rotational motion while reducing stress concentration, thereby maintaining reliable sealing without compromising fluid delivery capability.
Solution Approach 2:
The pump ring is designed with dynamic deformation capability, allowing it to change shape in response to the eccentric's rotation. The pump ring transitions between compressed and expanded states in a controlled manner, reducing mechanical stress while maintaining the pumping action and fluid delivery efficiency.
2Reliability
If the pump ring is made more compliant to reduce stress, then the risk of leaks decreases, but the forces required for eccentric rotation increase
Solution Approach 1:
By dividing the pump ring into multiple deformable portions, each segment can independently accommodate compression and expansion. This reduces the overall force required for rotation while maintaining compliance, as the segments deform in a distributed manner rather than requiring the entire ring to deform simultaneously.
Solution Approach 2:
The pump ring's structural parameters are optimized to achieve the right balance between compliance and rotational ease. The wall thickness, material properties, and geometric configuration are designed to allow controlled deformation that reduces both stress concentration and rotational resistance simultaneously.
3Productivity
If the pump ring is compressed uniformly, then the pump chamber volume reduces to pump fluid, but the mechanical stress on the pump ring increases
Solution Approach 1:
The pump ring is divided into segments that can compress and expand at different rates and magnitudes. This non-uniform deformation pattern reduces stress concentration in any single region while still achieving the necessary volume reduction for effective fluid pumping.
Solution Approach 2:
Different portions of the pump ring are designed with locally optimized properties. The first and second portions have different deformation characteristics tailored to their specific functional requirements, allowing localized stress management while maintaining overall pumping effectiveness.
4Productivity
If the pump ring is expanded uniformly, then the pump chamber volume increases to receive fluid, but the mechanical loading on the pump ring increases
Solution Approach 1:
The segmented pump ring structure allows different portions to expand at different rates during the intake phase. This distributed expansion reduces the peak forces required compared to uniform expansion, while still achieving the necessary volume increase for fluid reception.
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 reduces the forces required for eccentric rotation, minimizes the risk of leaks, and enhances the pump's efficiency by dynamically influencing the compression behavior and stiffness of the pump ring.
Implementation Method 1
the deformation of the pump ring from the un-deformed state to the deformed state corresponds to a compression of the pump ring
Implementation Method 2
a pump ring (14) which is deformable and defines an annular pump chamber
Implementation Method 3
an eccentric (18) which is configured to be rotatable relative to the pump housing and which is arranged in the pump device such that, depending on a current rotational position of the eccentric, the eccentric deforms the pump ring
Data Source
AI summary
The invention relates to a pump device (10) for pumping a fluid (13), comprising: a pump housing (12) having an annular portion (22); a pump ring (14), which is deformable and defines an annular pump chamber (57) at least in some portions; a first connection (51) and a second connection (52), said first connection (51) and said second connection (52) being in fluid communication with the pump chamber (57); an eccentric (18), which is designed to be rotatable relative to the pump housing (12) and which is arranged such in the pump device (10) that the eccentric (18), depending on a current rotational position of the eccentric (18), deforms the pump ring (14) in such a way that the pump ring (14) presses at least partially against the annular portion (22) in order to pump, by way of a rotation of the eccentric (18), the fluid (13) along the pump chamber (57) from the first connection (51) to the second connection (52) depending on the current rotational position of the eccentric; and a clamping element (114), which is designed to statically press the pump ring (14) against the annular portion (22) of the pump housing (12) in a clamping link region (45). The pump ring (14) has at least one recess (47) for accommodating at least part of the clamping element (114), said recess (47) being dimensioned such that in each rotational position of the eccentric (18) at least in some portions a distance (48) between the radially inner side (50) of the clamping element (114) and the pump ring (14) is provided.