Vane Pump Rotor with Non-Penetrating Shaft for Vibration Suppression
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Solution Overview
Problem
Vane pumps used for diagnosing leakage in piping systems face challenges with rotor vibrations and increased cost due to complex configurations and high sliding resistance, which affect diagnostic accuracy and component durability.
Innovation Solution
A vane pump design where the motor shaft does not penetrate the rotor, creating independent inner and outer spaces, allowing a pressure difference to stabilize the rotor's operation by pressing it against the housing, reducing vibrations and sliding resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the motor shaft penetrates through the rotor with clearance, then axial deflection and dimensional variations are absorbed, but rotor vibration increases and rotational stability deteriorates
Solution Approach 1:
The rotor is divided into two independent spaces (inner and outer) separated by the rotor body itself. The motor shaft fits into a concave portion on one side of the rotor without penetrating through, creating distinct pressure zones on either side of the rotor that can be independently controlled.
Solution Approach 2:
A pressure difference is applied between the inner and outer spaces of the rotor using pneumatic pressure. The higher pressure side presses the rotor against the housing wall surface, providing stable rotational support without requiring the motor shaft to penetrate through the rotor with clearance.
2Stability of the object's composition
If the rotor or slits are inclined to suppress vibrations, then rotor vibration is reduced, but production complexity increases and manufacturing cost rises
Solution Approach 1:
Instead of inclining the rotor or slits to suppress vibration (complex manufacturing), the invention inverts the approach by applying pressure differential forces through the non-penetrating shaft configuration. The pressure difference acts on the rotor surfaces to stabilize rotation, achieving vibration suppression through a simpler, axially-aligned structure.
Solution Approach 2:
The invention changes the pressure parameter between the inner and outer spaces of the rotor. By controlling the pressure difference (making one side higher pressure than the other), the rotor is pressed against the housing wall surface, providing vibration suppression without requiring geometric inclination of the rotor or slits.
3Stability of the object's composition
If slits are inclined to press vanes against housing wall, then rotor vibration is suppressed, but sliding resistance increases and gas leakage increases
Solution Approach 1:
Instead of inclining the slits to achieve stable rotor operation (which increases sliding resistance), the invention inverts the approach by applying pressure differential forces. The pressure difference presses the rotor against the housing, stabilizing rotation without increasing contact area between the slits and vanes, thereby maintaining low sliding resistance and preventing gas leakage.
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 effectively suppresses rotor vibrations and stabilizes rotational operation, improving diagnostic accuracy and reducing production costs by simplifying the structure and minimizing gas leakage.
Implementation Method 1
By making the inner side of the rotor communicate with the low pressure side of the housing outer part, a pressure difference is generated between inner and outer spaces of the rotor, and thus the rotor can slide with pressed against an inner wall surface of the rotor housing part by pressure of a compressed air outside the rotor
Implementation Method 2
With rotation of the rotor, the vanes slide in a radial direction inside the slits, so that the vanes rotate while maintaining a close contact state between an inner wall surface of the housing and end portions of the vanes. When the vanes rotate with keeping the close contact with the housing wall surface, there is generated a sealed space which is surrounded by the rotor, the housing, and the vanes; a volume of the space changes continuously with the rotation of the rotor, and thus a function as the air pump is established
Implementation Method 3
during rotation of a motor, vibrations of the rotor are suppressed by setting the rotor in a state that an outer edge part of the rotor is in sliding contact with a housing
Data Source
AI summary
A shaft is fitted in a shaft fitting concave part to provide a structure such that no shaft penetrates through a rotor, so that an inner space (shaft fitting concave part, and hollow parts) and an outer space (pump chamber) of the rotor are made independent. The inner space of the rotor is communicated with outside to be at a low pressure, and the outer space is at a high pressure due to gas compression, and an upper surface of the rotor slides on an inner wall surface of a rotor housing part with pressed against this inner wall surface by a pressure difference.