Variable Displacement Vane Pump Sealing Stability
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Solution Overview
Problem
Existing variable displacement vane pumps face issues with sealing member durability due to horizontal movement caused by pressure fluctuations, leading to potential cavitation erosion and reduced durability of adapter rings when high-strength materials are used to prevent such erosion.
Innovation Solution
The design incorporates a pair of sealing grooves and members with pressure chambers that control pressure differences, preventing horizontal movement of sealing members and using a low-pressure chamber connected to the intake port to maintain stable pressure, thus reducing the need for high-strength materials and preventing cavitation erosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a sealing member made of high-strength material is used to prevent cavitation erosion, then resistance to cavitation erosion is improved, but the risk of striking the adapter ring increases when the sealing member moves due to pressure fluctuation
Solution Approach 1:
The single control chamber is divided into two separate control chambers (first and second control chambers) with independent sealing members. This segmentation allows each sealing member to be independently controlled, preventing the horizontal movement that causes striking while still providing adequate cavitation erosion protection through the distributed sealing arrangement
Solution Approach 2:
The invention changes the pressure control parameters by introducing independent pressure control to each control chamber through separate sealing members. By controlling the pressure distribution in each chamber independently, the sealing members are stabilized in their respective positions, preventing movement that would cause striking while maintaining cavitation erosion resistance
2Adaptability or versatility
If the volume of the control chamber is allowed to fluctuate with cam ring swing, then the pump achieves variable displacement capability, but pressure fluctuation increases causing sealing member horizontal movement
Solution Approach 1:
The control system is segmented into two independent control chambers, each with its own sealing member and pressure control. This allows the pump to achieve variable displacement through cam ring swing while each sealed portion maintains relatively stable pressure, preventing sealing member horizontal movement
Solution Approach 2:
The invention introduces dynamic pressure control to each control chamber through independently controllable sealing members. By dynamically adjusting the pressure in each chamber, the system maintains pressure stability despite cam ring swing, enabling variable displacement while preventing sealing member movement
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 configuration enhances the durability of sealing members and adapter rings by stabilizing pressure fluctuations, preventing damage and cavitation erosion, while allowing the use of lower-cost materials.
Implementation Method 1
a first fluid-pressure chamber formed on a side on which a volume thereof decreases when the cam ring moves to a side on which an eccentricity of the cam ring increases, the first fluid-pressure chamber being configured such that a delivery pressure delivered through a delivery port is introduced; and a second fluid-pressure chamber formed on a side on which a volume thereof increases when the cam ring moves to a side on which an eccentricity of the cam ring increases, the second fluid-pressure chamber being configured such that the delivery pressure delivered through the delivery port is introduced
Data Source
AI summary
A variable displacement vane pump includes first and second sealing grooves formed on an intake port side and separated away from each other in a circumferential direction; first and second sealing members provided in the first and second sealing grooves; a first fluid-pressure chamber formed on a side on which a volume thereof decreases when the cam ring moves to a side on which an eccentricity of the cam ring increases; and a second fluid-pressure chamber formed on a side on which a volume thereof increases when the cam ring moves to a side on which the eccentricity of the cam ring increases; and a control valve configured to control the pressure in the first or second fluid-pressure chamber.