Orbital Pump Ring Local Stiffness for Eccentric Parking
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Solution Overview
Problem
Existing pump devices, such as orbital pumps, face issues with unwanted variations in conveyance properties and leaks due to arbitrary eccentric settings, particularly at a parking position of 180°±90°, which affect the efficient operation and starting torque.
Innovation Solution
A pump device with a hydraulic enclosure, a deformable pump ring, and a solid pump ring carrier, featuring a clamping member that statically presses the pump ring against the annular section, and incorporating design measures like recesses in the enclosure, an enlarged pump ring carrier diameter, and a geometric configuration with reduced strength in the clamping region to facilitate preferred parking and reduce starting torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the eccentric is allowed to park at arbitrary positions, then the pump device can operate with simple structure, but conveyance properties vary and leaks occur at parking position of 180°±90°
Solution Approach 1:
The pump ring is designed with non-uniform thickness, creating a specific region with reduced strength and stiffness in the clamping member region. This local structural variation allows the eccentric to be easily pressed into the parking position by the clamping member, while other regions maintain sufficient strength for normal operation. The local quality change enables reliable eccentric positioning without complex additional mechanisms.
2Reliability
If the eccentric is pressed strongly against the pump ring to prevent arbitrary parking, then parking position control improves, but starting torque increases significantly
Solution Approach 1:
By creating a localized weak region in the pump ring through non-uniform thickness distribution, the clamping member can apply sufficient clamping force to control eccentric parking position without requiring high overall pressing force. The reduced strength region acts as a compliance zone that yields easily under clamping force, enabling reliable positioning with lower starting torque.
Solution Approach 2:
The pump ring is pre-formed with a specific geometric configuration featuring a reduced strength region before operation. This preliminary structural preparation ensures that when the clamping member applies force, the eccentric is naturally guided into the correct parking position without requiring excessive force, thereby reducing starting torque requirements.
3Strength
If the pump ring is made uniformly strong throughout, then structural integrity is maintained, but the eccentric cannot be easily pressed into preferred parking position
Solution Approach 1:
The pump ring employs non-uniform thickness distribution, creating a localized region with reduced strength and stiffness while maintaining sufficient overall structural integrity. This local quality variation provides a compliance zone that facilitates easy eccentric positioning during operation, while the remaining portions of the pump ring maintain adequate strength for withstanding operational loads and pressures.
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 allows for easier parking of the eccentric, reducing the required starting torque from 68 mNm to 54 mNm, enhancing operational efficiency by minimizing leaks and variations in conveyance properties.
Implementation Method 1
an eccentric, which must be driven by a shaft defining an axial and a radial direction in such a manner that the eccentric is rotatable relative to the hydraulic enclosure, the eccentric being arranged in the pump device in such a manner that the eccentric, depending on the actual rotating position of the eccentric, deforms the pump ring
Implementation Method 2
a clamping member designed to statically press the pump ring in a clamping member region against the annular section of the hydraulic enclosure
Implementation Method 3
a pump ring that is deformable and which defines an annular pump chamber at least in certain regions
Data Source
AI summary
A pump device (10) for pumping a fluid, having a hydraulic enclosure (12) that comprises an annular section, a pump ring (14) that is deformable and which defines an annular pump chamber at least in certain regions, a pump ring carrier (16) that is solidly connected to the pump ring (14), a first connector and a second connector, which first connector and which second connector are in fluid communication with the pump chamber, wherein the pump device (10) is set up in such a way that at least one measure influences a parking position of an eccentric (18) such that said parking position is preferred in the region of a clamping member (114), the measure being selected from: a) at least one recess in the hydraulic housing, which recess locally widens the chamber for the pump ring (14) in the axial direction, b) a geometry of the pump ring carrier (16), in which the pump ring carrier (16) has an enlarged diameter on its inner side facing the eccentric (18) in the angular region of the clamping member (114), and c) a geometric configuration of the pump ring (14), which, in the non-installed state of the pump ring (14), provides in one region at least a reduced strength of the pump ring (14), said region being in the clamping member region in the installed state of the pump ring (14), resulting in a reduced axial pressing action of the pump ring (14) in the clamping member region.