Hydrostatic Port Plates for Vane Pump Rotor Centering
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Solution Overview
Problem
Vane pumps experience mechanical and volumetric inefficiencies due to rotor uncentering, leading to increased heat generation, component degradation, and reduced lifespan, often requiring costly repairs or additional components for centering.
Innovation Solution
A vane pump with hydrostatic pressure plates that utilize the pump's own high-pressure source to maintain rotor axial centering, preventing contact with plates and optimizing efficiency by applying differential thrust to counteract uncentering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rotor is allowed to move freely in the pumping chamber, then the pump structure is simpler, but the rotor becomes axially uncentered causing mechanical and volumetric efficiency loss
Solution Approach 1:
The system uses the pump's own high-pressure fluid to automatically center the rotor through hydrostatic pressure differential. The port plates utilize the pressure differential between the high-pressure compression/exhaust zone and the low-pressure suction zone to generate axial thrust that centers the rotor, eliminating the need for external centering mechanisms while maintaining high mechanical and volumetric efficiency
2Manufacturing precision
If external centering mechanisms are added to center the rotor, then rotor axial centering is improved, but the device complexity and cost increase
Solution Approach 1:
The pump utilizes its own high-pressure source to provide the centering function. The port plates are configured to receive high-pressure fluid from the compression/exhaust zone and deliver it to the rotor faces, creating an self-regulating centering mechanism that eliminates the need for external pumps, sensors, or control systems
Solution Approach 2:
The invention employs hydraulic pressure differential to achieve rotor centering. The high-pressure fluid from the compression/exhaust zone is directed through passages in the port plates to create axial thrust forces that push the rotor toward the center position, using the pump's own hydraulic energy rather than mechanical or electronic centering mechanisms
3Stability of the object's composition
If the rotor contacts the port plates, then the rotor position is fixed, but heat generation increases and component lifespan decreases
Solution Approach 1:
The hydrostatic centering mechanism continuously maintains the rotor in a centered position using the pump's own high-pressure fluid. This self-regulating system prevents rotor contact with the port plates by dynamically adjusting the axial thrust forces, thereby avoiding excessive heat generation and extending component lifespan without requiring external intervention
4Force
If the rotor moves toward one port plate, then the axial thrust is unbalanced, but cooling fluid flow is restricted to that side
Solution Approach 1:
The port plates are designed with fluid passages that deliver high-pressure fluid to both rotor faces, creating a self-balancing thermal management system. The hydraulic pressure differential automatically compensates for any rotor displacement, ensuring uniform cooling fluid flow distribution and preventing localized heat generation while maintaining balanced axial thrust forces
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
Extends pump life and service intervals, maintains mechanical and volumetric efficiency, and eliminates the need for external centering mechanisms, while preventing rotor drift and cooling flow restriction.
Implementation Method 1
a pressurization arrangement that uses pressure generated in the compression/exhaust zone to center the rotor between the first and second port plates
Implementation Method 2
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
Data Source
Figure 1
Figure 2
Figure 3A~3C
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.