Fluid Pressure Pump Port Plate Segmentation for Reduced Energy Loss
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Solution Overview
Problem
Conventional axial piston type fluid pressure pumps experience significant pressure loss due to the design of port plates and valve plates, which affects efficiency and requires increased discharge pressure to compensate.
Innovation Solution
The fluid pressure pump design includes a port plate with arc-shaped ports and bridges that divide the ports into multiple holes, with a greater number of holes than valve plate holes, allowing for narrower bridge widths and reduced pressure loss. Additionally, the relative rotation of the piston unit and port plate adjusts overlapping areas to minimize pressure loss, with specific quotients of bridge areas to valve plate holes optimized below 0.65.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the number of port holes is increased to reduce pressure loss, then pressure loss is reduced, but the structural complexity of the port plate increases
Solution Approach 1:
The port plate is segmented into multiple port holes (first port holes and second port holes) rather than using a single large port. This segmentation allows fluid to flow through multiple parallel paths, reducing pressure loss while distributing the structural complexity across multiple identical elements rather than one complex structure.
Solution Approach 2:
The bridges are designed with specific dimensional relationships to the port holes and valve plate holes. The width of bridges and the positioning of port holes are optimized locally to minimize pressure loss in critical flow paths while maintaining structural integrity where needed.
2Loss of energy
If the bridge width is reduced to minimize pressure loss, then pressure loss is reduced, but the structural strength of the port plate decreases
Solution Approach 1:
The dimensions of the bridges are precisely controlled based on the diameters of the port holes and valve plate holes. By optimizing the bridge width parameter relative to the hole dimensions, the design achieves minimal pressure loss while maintaining sufficient structural strength through calculated dimensional relationships.
3Loss of energy
If the number of bridges is increased to provide more port holes, then pressure loss is reduced, but the manufacturing complexity increases
Solution Approach 1:
The port plate is divided into multiple identical port hole structures that can be manufactured using standardized processes. This segmentation allows for modular manufacturing where the same machining operations can be repeated for each port hole, reducing overall manufacturing complexity despite the increased number of features.
Data Source
AI summary
Ports (11 and 12) are formed in a port plate (10). A plurality of valve plate holes are arranged on a circumference around the rotation axis (S). The port plate (10) includes a plurality of bridges (13) configured to divide the port (11) into a circumferential direction to provide a plurality of port holes (11a), and a plurality of bridges (14) configured to divide the port (12) into the circumferential direction to provide a plurality of port holes (12a). A summation of the number of port holes (11a) and the number of port holes (12a) is greater than the number of valve plate holes.