Flow Control Valve Rotor Assembly for Circumferential Rattle Suppression
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Solution Overview
Problem
Existing flow rate control valves experience variations in the opening degree of flow passage holes due to rattling in the circumferential direction between the disk and the shaft, leading to inconsistent fluid flow rates.
Innovation Solution
A valve device with a housing, a stationary disk, a drive device, a shaft, and a rotor, where the rotor includes a drive disk and a lever, and is equipped with first and second torsion springs to limit rattling in the circumferential direction, ensuring accurate control of the opening degree of the flow passage holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the disk and shaft are configured to rotate integrally without additional constraint mechanisms, then the device complexity is reduced, but rattling in the circumferential direction occurs causing variations in opening degree
Solution Approach 1:
The torsion spring is pre-loaded to continuously urge the shaft in the circumferential direction before any rattling occurs. This preliminary constraining action prevents circumferential play between the disk and shaft, ensuring consistent opening degree control without adding complex mechanical constraint structures.
Solution Approach 2:
The patent changes the physical state of the constraint mechanism from a rigid mechanical connection to a弹性 torsion spring system. This allows the shaft to be continuously urged in the circumferential direction, eliminating rattling while maintaining rotational freedom and preserving the simplicity of the overall structure.
2Manufacturing precision
If torsion springs are added to urge the shaft in the circumferential direction, then rattling is limited and opening degree control is improved, but the device complexity increases
Solution Approach 1:
The torsion spring serves multiple functions simultaneously: it constrains circumferential rattling, provides continuous urging force for precise positioning, and works with the existing shaft and disk structure. This multi-functionality achieves precise opening degree control without requiring multiple separate constraint mechanisms.
Solution Approach 2:
The torsion spring acts as an intermediary element between the shaft and the housing. It provides the necessary circumferential constraint force while allowing the shaft to rotate freely, mediating between the need for precision and the need for rotational freedom without direct rigid connections.
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 valve device effectively limits rattling in the circumferential direction, thereby reducing variations in the opening degrees of the flow passage holes and achieving precise control over fluid flow rates.
Implementation Method 1
A first torsion spring is placed between the housing and the shaft and is configured to urge the shaft relative to the housing in a circumferential direction around the central axis of the shaft
Implementation Method 2
A second torsion spring is placed between the shaft and the lever and is configured to urge the lever relative to the shaft in the circumferential direction
Data Source
AI summary
In a valve device, a rotor includes a drive disk and a lever fixed to the drive disk. The lever couples between the drive disk and a shaft. In the valve device, a first torsion spring is placed between a housing and the shaft, and a second torsion spring is placed between the shaft and the lever. A drive device includes an electric motor configured to drive the shaft in a rotational drive range, which is between an initial rotational position and a maximum rotational position, in a first rotational direction toward the initial rotational position and a second rotational direction opposite to the first rotational direction. The first torsion spring urges the shaft relative to the housing in the second rotational direction in the state where the shaft is placed in the initial rotational position upon the rotation of the shaft in the first rotational direction.