Vane Pump Asymmetric Port Design for Rotor Stability
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Solution Overview
Problem
The existing vane pump designs in vapor leakage check systems experience unstable rotor rotation due to pressure gradients, affecting the pumping property and leading to potential instability in fluid compression and decompression processes.
Innovation Solution
A vane pump design featuring a housing with symmetrical inlet and outlet ports relative to an imaginary plane bisecting the pump chamber, along with a rotor and motor configuration that maintains equal pressures on both sides of the chamber, preventing pressure differences and ensuring stable rotor posture and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the inlet port and outlet port are located on the same end of the pump chamber, then the device complexity is reduced, but a pressure gradient is generated in the axis direction causing unstable rotor rotation
Solution Approach 1:
The patent applies asymmetry by positioning the inlet port and outlet port at different ends of the pump chamber along the axis direction, creating an asymmetric port arrangement that prevents pressure gradient formation and ensures stable rotor rotation, while still maintaining relatively simple device complexity
2Reliability
If the rotor rotates unstably due to pressure gradient, then the pumping property becomes unstable, but changing the port arrangement increases device complexity
Solution Approach 1:
The asymmetric port arrangement with inlet and outlet ports at opposite ends of the pump chamber eliminates pressure gradients, ensuring stable rotor rotation and reliable pumping performance while maintaining acceptable device complexity
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 design stabilizes the rotor's rotation, maintaining consistent pumping performance and preventing wear powder discharge issues, while reducing component count and production costs by integrating the first board and cylindrical part.
Implementation Method 1
When the rotor is rotated by the motor, fluid is compressed, and the compressed fluid is discharged from the vane pump
Implementation Method 2
a pressure difference is generated between the end of the pump chamber having the inlet port and the outlet port and the other end of the pump chamber in the axis direction. In this case, a pressure gradient is generated in the axis direction, thereby affecting a posture of the rotor
Data Source
AI summary
A vane pump includes a housing defining a pump chamber; a rotor rotatably arranged in the pump chamber; and a motor to rotate the rotor. An imaginary plane is defined to bisect the pump chamber in an axis direction. The housing has a first inlet port and a second inlet port located symmetrical with each other with respect to the imaginary plane, and the housing has a first outlet port and a second outlet port located symmetrical with each other with respect to the imaginary plane.