Hydrostatic Port Plates for Vane Pump Rotor Axial Centering
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Solution Overview
Problem
Vane pumps experience mechanical and volumetric inefficiencies due to rotor axial misalignment, leading to increased heat generation, component degradation, and reduced lifespan, often requiring costly repairs or maintenance.
Innovation Solution
A vane pump design incorporating hydrostatic pressure plates that maintain rotor axial centering using the pump's own high-pressure source, eliminating the need for additional components like electronic sensors or external pressure sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rotor is allowed to operate without axial centering mechanism, then the device complexity is reduced, but the mechanical and volumetric efficiency deteriorates due to rotor misalignment
Solution Approach 1:
The port plates utilize the pump's own high-pressure fluid to generate axial thrust that automatically centers the rotor. The system serves itself by using its operating fluid to maintain proper rotor alignment without external intervention or additional centering mechanisms.
Solution Approach 2:
Hydraulic pressure is applied to the port plates to generate the axial thrust force needed for rotor centering. The high-pressure fluid from the pump's compression/exhaust zone creates the necessary force to counteract misalignment and maintain optimal rotor positioning.
2Manufacturing precision
If additional components like electronic sensors or external pressure sources are added to center the rotor, then the rotor alignment precision is improved, but the device complexity increases
Solution Approach 1:
The system eliminates the need for external sensors or pressure sources by using its own high-pressure fluid to automatically center the rotor. The port plates respond directly to the pump's operating pressure, creating a self-regulating centering mechanism.
Solution Approach 2:
The high-pressure fluid serves dual purposes: it performs the pump's primary function of fluid pressurization and simultaneously provides the axial thrust for rotor centering. This multi-functionality eliminates the need for separate centering systems.
3Productivity
If the rotor becomes axially uncentered and contacts port plates, then the mechanical efficiency is reduced, but the temperature increases due to restricted cooling flow
Solution Approach 1:
The axial thrust from the port plates acts in advance to prevent rotor contact with the plates. By continuously applying centering force, the system prevents misalignment before it can cause mechanical inefficiency or restrict cooling flow paths.
Solution Approach 2:
The system provides automatic feedback through the port plates that respond to rotor position. When the rotor shifts axially, the port plate closest to it experiences greater pressure and generates corrective thrust to push the rotor back toward the centered position.
4Device complexity
If the pump operates without a centering mechanism, then the device complexity is lower, but the reliability deteriorates due to rotor misalignment and component degradation
Solution Approach 1:
The pump maintains its own reliability by using its operating fluid to continuously center the rotor and prevent misalignment-related wear. The system self-corrects positioning issues without external maintenance or intervention.
Solution Approach 2:
The port plates provide continuous axial support that cushions the rotor against misalignment forces before they can cause damage. This preventive centering action protects components from degradation that would reduce pump lifespan.
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 extends pump life and service intervals, optimizes mechanical and volumetric efficiency, and prevents cooling flow restriction, all while maintaining rotor alignment without external intervention.
Implementation Method 1
The port plates are in fluid connection with a compression/exhaust zone of the vane pump and are configured to apply a centering axial thrust to the rotor
Implementation Method 2
If the rotor becomes uncentered between the port plates, the port plate closest to the rotor is configured to provide a greater axial thrust than the port plate further from the rotor, resulting in the rotor moving towards a central position between the port plates
Data Source
AI summary
The present disclosure comprises a vane pump with hydrostatic pressure plates, or port plates, to axially center a rotor between the port plates. The port plates comprise a pressurization arrangement configured to provide unequal opposing pressures to the rotor when the rotor moves closer to one of the port plates, which provides a net axial thrust to the rotor to move it towards a central position. The pressurization arrangement can comprise circular grooves in the port plates in fluid communication with a high pressure exhaust zone of the pump. Fluid moves from the exhaust zone, through pressurized lines, into the port plates, through an orifice, and into the grooves. The pressurization arrangement can also comprise inner and outer diameter seal rings concentrically disposed inside and outside the grooves. The seal rings can be comprised of a relatively close clearance to the rotor compared to the grooves.